xnu-7195.60.75.tar.gz

[apple/xnu.git] / bsd / nfs / nfs_bio.c

diff --git a/bsd/nfs/nfs_bio.c b/bsd/nfs/nfs_bio.c
index 1c1c1912380f568b95ab65cd6dc8de20d214ebe7..b9c2b5ac1e773f564de12066f909239ea7b27176 100644 (file)
--- a/bsd/nfs/nfs_bio.c
+++ b/bsd/nfs/nfs_bio.c
@@ -1,8 +1,8 @@
 /*
 /*

- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

- * 
+ *

  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in


@@ -11,10 +11,10 @@
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.

- * 
+ *

  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.

- * 
+ *

  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,


@@ -22,7 +22,7 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.

- * 
+ *

  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */


@@ -64,6 +64,10 @@
  *     @(#)nfs_bio.c   8.9 (Berkeley) 3/30/95
  * FreeBSD-Id: nfs_bio.c,v 1.44 1997/09/10 19:52:25 phk Exp $
  */
  *     @(#)nfs_bio.c   8.9 (Berkeley) 3/30/95
  * FreeBSD-Id: nfs_bio.c,v 1.44 1997/09/10 19:52:25 phk Exp $
  */

+
+#include <nfs/nfs_conf.h>
+#if CONFIG_NFS_CLIENT
+

 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/resourcevar.h>
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/resourcevar.h>


@@ -77,6 +81,7 @@
 #include <sys/kernel.h>
 #include <sys/ubc_internal.h>
 #include <sys/uio_internal.h>
 #include <sys/kernel.h>
 #include <sys/ubc_internal.h>
 #include <sys/uio_internal.h>

+#include <sys/kpi_mbuf.h>

 
 #include <sys/vm.h>
 #include <sys/vmparam.h>
 
 #include <sys/vm.h>
 #include <sys/vmparam.h>


@@ -95,12 +100,15 @@
 #include <nfs/nfsnode.h>
 #include <sys/buf_internal.h>
 #include <libkern/OSAtomic.h>
 #include <nfs/nfsnode.h>
 #include <sys/buf_internal.h>
 #include <libkern/OSAtomic.h>

+#include <os/refcnt.h>

 
 

-kern_return_t  thread_terminate(thread_t); /* XXX */
+#define NFS_BIO_DBG(...) NFS_DBG(NFS_FAC_BIO, 7, ## __VA_ARGS__)

 
 

-#define        NFSBUFHASH(np, lbn)     \
+kern_return_t   thread_terminate(thread_t); /* XXX */
+
+#define NFSBUFHASH(np, lbn)     \

        (&nfsbufhashtbl[((long)(np) / sizeof(*(np)) + (int)(lbn)) & nfsbufhash])
        (&nfsbufhashtbl[((long)(np) / sizeof(*(np)) + (int)(lbn)) & nfsbufhash])

-LIST_HEAD(nfsbufhashhead, nfsbuf) *nfsbufhashtbl;
+LIST_HEAD(nfsbufhashhead, nfsbuf) * nfsbufhashtbl;

 struct nfsbuffreehead nfsbuffree, nfsbuffreemeta, nfsbufdelwri;
 u_long nfsbufhash;
 int nfsbufcnt, nfsbufmin, nfsbufmax, nfsbufmetacnt, nfsbufmetamax;
 struct nfsbuffreehead nfsbuffree, nfsbuffreemeta, nfsbufdelwri;
 u_long nfsbufhash;
 int nfsbufcnt, nfsbufmin, nfsbufmax, nfsbufmetacnt, nfsbufmetamax;


@@ -109,37 +117,98 @@ int nfs_nbdwrite;
 int nfs_buf_timer_on = 0;
 thread_t nfsbufdelwrithd = NULL;
 
 int nfs_buf_timer_on = 0;
 thread_t nfsbufdelwrithd = NULL;
 

+ZONE_DECLARE(nfsbuf_zone, "NFS bio", sizeof(struct nfsbuf), ZC_NONE);
+

 lck_grp_t *nfs_buf_lck_grp;
 lck_mtx_t *nfs_buf_mutex;
 
 lck_grp_t *nfs_buf_lck_grp;
 lck_mtx_t *nfs_buf_mutex;
 

-#define NFSBUF_FREE_PERIOD     30      /* seconds */
-#define NFSBUF_LRU_STALE       120
-#define NFSBUF_META_STALE      240
+#define NFSBUF_FREE_PERIOD      30      /* seconds */
+#define NFSBUF_LRU_STALE        120
+#define NFSBUF_META_STALE       240

 
 /* number of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffree list */
 
 /* number of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffree list */

-#define LRU_TO_FREEUP                  6
+#define LRU_TO_FREEUP                   6

 /* number of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffreemeta list */
 /* number of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffreemeta list */

-#define META_TO_FREEUP                 3
+#define META_TO_FREEUP                  3

 /* total number of nfsbufs nfs_buf_freeup() should attempt to free */
 /* total number of nfsbufs nfs_buf_freeup() should attempt to free */

-#define TOTAL_TO_FREEUP                        (LRU_TO_FREEUP+META_TO_FREEUP)
+#define TOTAL_TO_FREEUP                 (LRU_TO_FREEUP+META_TO_FREEUP)

 /* fraction of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffree list when called from timer */
 /* fraction of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffree list when called from timer */

-#define LRU_FREEUP_FRAC_ON_TIMER       8
+#define LRU_FREEUP_FRAC_ON_TIMER        8

 /* fraction of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffreemeta list when called from timer */
 /* fraction of nfsbufs nfs_buf_freeup() should attempt to free from nfsbuffreemeta list when called from timer */

-#define META_FREEUP_FRAC_ON_TIMER      16
+#define META_FREEUP_FRAC_ON_TIMER       16

 /* fraction of total nfsbufs that nfsbuffreecnt should exceed before bothering to call nfs_buf_freeup() */
 /* fraction of total nfsbufs that nfsbuffreecnt should exceed before bothering to call nfs_buf_freeup() */

-#define LRU_FREEUP_MIN_FRAC            4
+#define LRU_FREEUP_MIN_FRAC             4

 /* fraction of total nfsbufs that nfsbuffreemetacnt should exceed before bothering to call nfs_buf_freeup() */
 /* fraction of total nfsbufs that nfsbuffreemetacnt should exceed before bothering to call nfs_buf_freeup() */

-#define META_FREEUP_MIN_FRAC           2
+#define META_FREEUP_MIN_FRAC            2
+
+#define NFS_ROUND_BLOCK(p, blksize)         ((((uint64_t)(p) + blksize - 1) & ~((uint64_t)blksize - 1)) / blksize)

 
 #define NFS_BUF_FREEUP() \
        do { \
 
 #define NFS_BUF_FREEUP() \
        do { \

-               /* only call nfs_buf_freeup() if it has work to do: */ \
-               if (((nfsbuffreecnt > nfsbufcnt/LRU_FREEUP_MIN_FRAC) || \
-                    (nfsbuffreemetacnt > nfsbufcnt/META_FREEUP_MIN_FRAC)) && \
-                   ((nfsbufcnt - TOTAL_TO_FREEUP) > nfsbufmin)) \
-                       nfs_buf_freeup(0); \
+       /* only call nfs_buf_freeup() if it has work to do: */ \
+               if (((nfsbuffreecnt > nfsbufcnt/LRU_FREEUP_MIN_FRAC) || \
+                    (nfsbuffreemetacnt > nfsbufcnt/META_FREEUP_MIN_FRAC)) && \
+                   ((nfsbufcnt - TOTAL_TO_FREEUP) > nfsbufmin)) \
+                       nfs_buf_freeup(0); \

        } while (0)
 
        } while (0)
 

+void
+nfs_buf_pgs_get_page_mask(nfsbufpgs *nfsbp, off_t page)
+{
+       off_t page_pos = page / NBPGS_ELEMENT_PAGES;
+       off_t max_page = NBPGS_STRUCT_SIZE * 8;
+       NBPGS_ERASE(nfsbp);
+
+       if (page >= max_page) {
+               nfs_buf_pgs_bit_not(nfsbp);
+               return;
+       }
+
+       NBPGS_SET(nfsbp, page);
+       nfsbp->pages[page_pos]--;
+       for (off_t i = page_pos - 1; i >= 0; i--) {
+               nfsbp->pages[i] = ~0;
+       }
+}
+
+void
+nfs_buf_pgs_bit_not(nfsbufpgs *nfsbp)
+{
+       for (uint32_t i = 0; i < NBPGS_ELEMENTS; i++) {
+               nfsbp->pages[i] = ~nfsbp->pages[i];
+       }
+}
+
+void
+nfs_buf_pgs_bit_and(nfsbufpgs *nfsbp_src1, nfsbufpgs *nfsbp_src2, nfsbufpgs *nfsbp_dst)
+{
+       for (uint32_t i = 0; i < NBPGS_ELEMENTS; i++) {
+               nfsbp_dst->pages[i] = nfsbp_src1->pages[i] & nfsbp_src2->pages[i];
+       }
+}
+
+void
+nfs_buf_pgs_set_pages_between(nfsbufpgs *nfsbp, off_t firstpg, off_t lastpg)
+{
+       nfsbufpgs pagemaskfirst, pagemasklast;
+
+       nfs_buf_pgs_get_page_mask(&pagemasklast, lastpg);
+       nfs_buf_pgs_get_page_mask(&pagemaskfirst, firstpg);
+       nfs_buf_pgs_bit_not(&pagemaskfirst);
+       nfs_buf_pgs_bit_and(&pagemaskfirst, &pagemasklast, nfsbp);
+}
+
+int
+nfs_buf_pgs_is_set(nfsbufpgs *nfsbp)
+{
+       for (uint32_t i = 0; i < NBPGS_ELEMENTS; i++) {
+               if (nfsbp->pages[i] != 0) {
+                       return 1;
+               }
+       }
+       return 0;
+}
+

 /*
  * Initialize nfsbuf lists
  */
 /*
  * Initialize nfsbuf lists
  */


@@ -150,19 +219,18 @@ nfs_nbinit(void)
        nfs_buf_mutex = lck_mtx_alloc_init(nfs_buf_lck_grp, LCK_ATTR_NULL);
 
        nfsbufcnt = nfsbufmetacnt =
        nfs_buf_mutex = lck_mtx_alloc_init(nfs_buf_lck_grp, LCK_ATTR_NULL);
 
        nfsbufcnt = nfsbufmetacnt =

-       nfsbuffreecnt = nfsbuffreemetacnt = nfsbufdelwricnt = 0;
+           nfsbuffreecnt = nfsbuffreemetacnt = nfsbufdelwricnt = 0;

        nfsbufmin = 128;
        /* size nfsbufmax to cover at most half sane_size (w/default buf size) */
        nfsbufmin = 128;
        /* size nfsbufmax to cover at most half sane_size (w/default buf size) */

-       nfsbufmax = (sane_size >> PAGE_SHIFT) / (2 * (NFS_RWSIZE >> PAGE_SHIFT));
+       nfsbufmax = (int)(sane_size >> PAGE_SHIFT) / (2 * (NFS_RWSIZE >> PAGE_SHIFT));

        nfsbufmetamax = nfsbufmax / 4;
        nfsneedbuffer = 0;
        nfs_nbdwrite = 0;
 
        nfsbufmetamax = nfsbufmax / 4;
        nfsneedbuffer = 0;
        nfs_nbdwrite = 0;
 

-       nfsbufhashtbl = hashinit(nfsbufmax/4, M_TEMP, &nfsbufhash);
+       nfsbufhashtbl = hashinit(nfsbufmax / 4, M_NFSBIO, &nfsbufhash);

        TAILQ_INIT(&nfsbuffree);
        TAILQ_INIT(&nfsbuffreemeta);
        TAILQ_INIT(&nfsbufdelwri);
        TAILQ_INIT(&nfsbuffree);
        TAILQ_INIT(&nfsbuffreemeta);
        TAILQ_INIT(&nfsbufdelwri);

-

 }
 
 /*
 }
 
 /*


@@ -182,7 +250,7 @@ nfs_buf_timer(__unused void *param0, __unused void *param1)
        lck_mtx_unlock(nfs_buf_mutex);
 
        nfs_interval_timer_start(nfs_buf_timer_call,
        lck_mtx_unlock(nfs_buf_mutex);
 
        nfs_interval_timer_start(nfs_buf_timer_call,

-               NFSBUF_FREE_PERIOD * 1000);
+           NFSBUF_FREE_PERIOD * 1000);

 }
 
 /*
 }
 
 /*


@@ -204,16 +272,19 @@ nfs_buf_freeup(int timer)
 
        FSDBG(320, nfsbufcnt, nfsbuffreecnt, nfsbuffreemetacnt, 0);
 
 
        FSDBG(320, nfsbufcnt, nfsbuffreecnt, nfsbuffreemetacnt, 0);
 

-       count = timer ? nfsbuffreecnt/LRU_FREEUP_FRAC_ON_TIMER : LRU_TO_FREEUP;
+       count = timer ? nfsbuffreecnt / LRU_FREEUP_FRAC_ON_TIMER : LRU_TO_FREEUP;

        while ((nfsbufcnt > nfsbufmin) && (count-- > 0)) {
                fbp = TAILQ_FIRST(&nfsbuffree);
        while ((nfsbufcnt > nfsbufmin) && (count-- > 0)) {
                fbp = TAILQ_FIRST(&nfsbuffree);

-               if (!fbp)
+               if (!fbp) {

                        break;
                        break;

-               if (fbp->nb_refs)
+               }
+               if (os_ref_get_count(&fbp->nb_refs) > 1) {

                        break;
                        break;

+               }

                if (NBUFSTAMPVALID(fbp) &&
                if (NBUFSTAMPVALID(fbp) &&

-                   (fbp->nb_timestamp + (2*NFSBUF_LRU_STALE)) > now.tv_sec)
+                   (fbp->nb_timestamp + (2 * NFSBUF_LRU_STALE)) > now.tv_sec) {

                        break;
                        break;

+               }

                nfs_buf_remfree(fbp);
                /* disassociate buffer from any nfsnode */
                if (fbp->nb_np) {
                nfs_buf_remfree(fbp);
                /* disassociate buffer from any nfsnode */
                if (fbp->nb_np) {


@@ -228,16 +299,19 @@ nfs_buf_freeup(int timer)
                nfsbufcnt--;
        }
 
                nfsbufcnt--;
        }
 

-       count = timer ? nfsbuffreemetacnt/META_FREEUP_FRAC_ON_TIMER : META_TO_FREEUP;
+       count = timer ? nfsbuffreemetacnt / META_FREEUP_FRAC_ON_TIMER : META_TO_FREEUP;

        while ((nfsbufcnt > nfsbufmin) && (count-- > 0)) {
                fbp = TAILQ_FIRST(&nfsbuffreemeta);
        while ((nfsbufcnt > nfsbufmin) && (count-- > 0)) {
                fbp = TAILQ_FIRST(&nfsbuffreemeta);

-               if (!fbp)
+               if (!fbp) {

                        break;
                        break;

-               if (fbp->nb_refs)
+               }
+               if (os_ref_get_count(&fbp->nb_refs) > 1) {

                        break;
                        break;

+               }

                if (NBUFSTAMPVALID(fbp) &&
                if (NBUFSTAMPVALID(fbp) &&

-                   (fbp->nb_timestamp + (2*NFSBUF_META_STALE)) > now.tv_sec)
+                   (fbp->nb_timestamp + (2 * NFSBUF_META_STALE)) > now.tv_sec) {

                        break;
                        break;

+               }

                nfs_buf_remfree(fbp);
                /* disassociate buffer from any nfsnode */
                if (fbp->nb_np) {
                nfs_buf_remfree(fbp);
                /* disassociate buffer from any nfsnode */
                if (fbp->nb_np) {


@@ -261,16 +335,18 @@ nfs_buf_freeup(int timer)
        while ((fbp = TAILQ_FIRST(&nfsbuffreeup))) {
                TAILQ_REMOVE(&nfsbuffreeup, fbp, nb_free);
                /* nuke any creds */
        while ((fbp = TAILQ_FIRST(&nfsbuffreeup))) {
                TAILQ_REMOVE(&nfsbuffreeup, fbp, nb_free);
                /* nuke any creds */

-               if (IS_VALID_CRED(fbp->nb_rcred))
+               if (IS_VALID_CRED(fbp->nb_rcred)) {

                        kauth_cred_unref(&fbp->nb_rcred);
                        kauth_cred_unref(&fbp->nb_rcred);

-               if (IS_VALID_CRED(fbp->nb_wcred))
+               }
+               if (IS_VALID_CRED(fbp->nb_wcred)) {

                        kauth_cred_unref(&fbp->nb_wcred);
                        kauth_cred_unref(&fbp->nb_wcred);

+               }

                /* if buf was NB_META, dump buffer */
                /* if buf was NB_META, dump buffer */

-               if (ISSET(fbp->nb_flags, NB_META) && fbp->nb_data)
-                       kfree(fbp->nb_data, fbp->nb_bufsize);
-               FREE(fbp, M_TEMP);
+               if (ISSET(fbp->nb_flags, NB_META) && fbp->nb_data) {
+                       kheap_free(KHEAP_DATA_BUFFERS, fbp->nb_data, fbp->nb_bufsize);
+               }
+               NFS_ZFREE(nfsbuf_zone, fbp);

        }
        }

-

 }
 
 /*
 }
 
 /*


@@ -280,8 +356,9 @@ nfs_buf_freeup(int timer)
 void
 nfs_buf_remfree(struct nfsbuf *bp)
 {
 void
 nfs_buf_remfree(struct nfsbuf *bp)
 {

-       if (bp->nb_free.tqe_next == NFSNOLIST)
+       if (bp->nb_free.tqe_next == NFSNOLIST) {

                panic("nfsbuf not on free list");
                panic("nfsbuf not on free list");

+       }

        if (ISSET(bp->nb_flags, NB_DELWRI)) {
                nfsbufdelwricnt--;
                TAILQ_REMOVE(&nfsbufdelwri, bp, nb_free);
        if (ISSET(bp->nb_flags, NB_DELWRI)) {
                nfsbufdelwricnt--;
                TAILQ_REMOVE(&nfsbufdelwri, bp, nb_free);


@@ -304,12 +381,13 @@ nfs_buf_is_incore(nfsnode_t np, daddr64_t blkno)
 {
        boolean_t rv;
        lck_mtx_lock(nfs_buf_mutex);
 {
        boolean_t rv;
        lck_mtx_lock(nfs_buf_mutex);

-       if (nfs_buf_incore(np, blkno))
+       if (nfs_buf_incore(np, blkno)) {

                rv = TRUE;
                rv = TRUE;

-       else
+       } else {

                rv = FALSE;
                rv = FALSE;

+       }

        lck_mtx_unlock(nfs_buf_mutex);
        lck_mtx_unlock(nfs_buf_mutex);

-       return (rv);
+       return rv;

 }
 
 /*
 }
 
 /*


@@ -320,14 +398,15 @@ nfs_buf_incore(nfsnode_t np, daddr64_t blkno)
 {
        /* Search hash chain */
        struct nfsbuf * bp = NFSBUFHASH(np, blkno)->lh_first;
 {
        /* Search hash chain */
        struct nfsbuf * bp = NFSBUFHASH(np, blkno)->lh_first;

-       for (; bp != NULL; bp = bp->nb_hash.le_next)
+       for (; bp != NULL; bp = bp->nb_hash.le_next) {

                if ((bp->nb_lblkno == blkno) && (bp->nb_np == np)) {
                        if (!ISSET(bp->nb_flags, NB_INVAL)) {
                                FSDBG(547, bp, blkno, bp->nb_flags, bp->nb_np);
                if ((bp->nb_lblkno == blkno) && (bp->nb_np == np)) {
                        if (!ISSET(bp->nb_flags, NB_INVAL)) {
                                FSDBG(547, bp, blkno, bp->nb_flags, bp->nb_np);

-                               return (bp);
+                               return bp;

                        }
                }
                        }
                }

-       return (NULL);
+       }
+       return NULL;

 }
 
 /*
 }
 
 /*


@@ -345,13 +424,15 @@ nfs_buf_page_inval(vnode_t vp, off_t offset)
        struct nfsbuf *bp;
        int error = 0;
 
        struct nfsbuf *bp;
        int error = 0;
 

-       if (!nmp)
-               return (ENXIO);
+       if (nfs_mount_gone(nmp)) {
+               return ENXIO;
+       }

 
        lck_mtx_lock(nfs_buf_mutex);
        bp = nfs_buf_incore(VTONFS(vp), (daddr64_t)(offset / nmp->nm_biosize));
 
        lck_mtx_lock(nfs_buf_mutex);
        bp = nfs_buf_incore(VTONFS(vp), (daddr64_t)(offset / nmp->nm_biosize));

-       if (!bp)
+       if (!bp) {

                goto out;
                goto out;

+       }

        FSDBG(325, bp, bp->nb_flags, bp->nb_dirtyoff, bp->nb_dirtyend);
        if (ISSET(bp->nb_lflags, NBL_BUSY)) {
                error = EBUSY;
        FSDBG(325, bp, bp->nb_flags, bp->nb_dirtyoff, bp->nb_dirtyend);
        if (ISSET(bp->nb_lflags, NBL_BUSY)) {
                error = EBUSY;


@@ -363,7 +444,7 @@ nfs_buf_page_inval(vnode_t vp, off_t offset)
         * If it does, we can't let the pager drop the page.
         */
        if (bp->nb_dirtyend > 0) {
         * If it does, we can't let the pager drop the page.
         */
        if (bp->nb_dirtyend > 0) {

-               int start = offset - NBOFF(bp);
+               off_t start = offset - NBOFF(bp);

                if ((bp->nb_dirtyend > start) &&
                    (bp->nb_dirtyoff < (start + PAGE_SIZE))) {
                        /*
                if ((bp->nb_dirtyend > start) &&
                    (bp->nb_dirtyoff < (start + PAGE_SIZE))) {
                        /*


@@ -381,7 +462,7 @@ nfs_buf_page_inval(vnode_t vp, off_t offset)
        }
 out:
        lck_mtx_unlock(nfs_buf_mutex);
        }
 out:
        lck_mtx_unlock(nfs_buf_mutex);

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -395,8 +476,9 @@ nfs_buf_upl_setup(struct nfsbuf *bp)
        upl_t upl;
        int upl_flags;
 
        upl_t upl;
        int upl_flags;
 

-       if (ISSET(bp->nb_flags, NB_PAGELIST))
-               return (0);
+       if (ISSET(bp->nb_flags, NB_PAGELIST)) {
+               return 0;
+       }

 
        upl_flags = UPL_PRECIOUS;
        if (!ISSET(bp->nb_flags, NB_READ)) {
 
        upl_flags = UPL_PRECIOUS;
        if (!ISSET(bp->nb_flags, NB_READ)) {


@@ -406,24 +488,24 @@ nfs_buf_upl_setup(struct nfsbuf *bp)
                 */
                upl_flags |= UPL_WILL_MODIFY;
        }
                 */
                upl_flags |= UPL_WILL_MODIFY;
        }

-       kret = ubc_create_upl(NFSTOV(bp->nb_np), NBOFF(bp), bp->nb_bufsize,
-                               &upl, NULL, upl_flags);
+       kret = ubc_create_upl_kernel(NFSTOV(bp->nb_np), NBOFF(bp), bp->nb_bufsize,
+           &upl, NULL, upl_flags, VM_KERN_MEMORY_FILE);

        if (kret == KERN_INVALID_ARGUMENT) {
                /* vm object probably doesn't exist any more */
                bp->nb_pagelist = NULL;
        if (kret == KERN_INVALID_ARGUMENT) {
                /* vm object probably doesn't exist any more */
                bp->nb_pagelist = NULL;

-               return (EINVAL);
+               return EINVAL;

        }
        if (kret != KERN_SUCCESS) {
                printf("nfs_buf_upl_setup(): failed to get pagelist %d\n", kret);
                bp->nb_pagelist = NULL;
        }
        if (kret != KERN_SUCCESS) {
                printf("nfs_buf_upl_setup(): failed to get pagelist %d\n", kret);
                bp->nb_pagelist = NULL;

-               return (EIO);
+               return EIO;

        }
 
        FSDBG(538, bp, NBOFF(bp), bp->nb_bufsize, bp->nb_np);
 
        bp->nb_pagelist = upl;
        SET(bp->nb_flags, NB_PAGELIST);
        }
 
        FSDBG(538, bp, NBOFF(bp), bp->nb_bufsize, bp->nb_np);
 
        bp->nb_pagelist = upl;
        SET(bp->nb_flags, NB_PAGELIST);

-       return (0);
+       return 0;

 }
 
 /*
 }
 
 /*


@@ -437,38 +519,44 @@ nfs_buf_upl_check(struct nfsbuf *bp)
        off_t filesize, fileoffset;
        int i, npages;
 
        off_t filesize, fileoffset;
        int i, npages;
 

-       if (!ISSET(bp->nb_flags, NB_PAGELIST))
+       if (!ISSET(bp->nb_flags, NB_PAGELIST)) {

                return;
                return;

+       }

 
        npages = round_page_32(bp->nb_bufsize) / PAGE_SIZE;
        filesize = ubc_getsize(NFSTOV(bp->nb_np));
        fileoffset = NBOFF(bp);
 
        npages = round_page_32(bp->nb_bufsize) / PAGE_SIZE;
        filesize = ubc_getsize(NFSTOV(bp->nb_np));
        fileoffset = NBOFF(bp);

-       if (fileoffset < filesize)
+       if (fileoffset < filesize) {

                SET(bp->nb_flags, NB_CACHE);
                SET(bp->nb_flags, NB_CACHE);

-       else
+       } else {

                CLR(bp->nb_flags, NB_CACHE);
                CLR(bp->nb_flags, NB_CACHE);

+       }

 
        pl = ubc_upl_pageinfo(bp->nb_pagelist);
 
        pl = ubc_upl_pageinfo(bp->nb_pagelist);

-       bp->nb_valid = bp->nb_dirty = 0;
+       NBPGS_ERASE(&bp->nb_valid);
+       NBPGS_ERASE(&bp->nb_dirty);

 
 

-       for (i=0; i < npages; i++, fileoffset += PAGE_SIZE_64) {
+       for (i = 0; i < npages; i++, fileoffset += PAGE_SIZE_64) {

                /* anything beyond the end of the file is not valid or dirty */
                /* anything beyond the end of the file is not valid or dirty */

-               if (fileoffset >= filesize)
+               if (fileoffset >= filesize) {

                        break;
                        break;

+               }

                if (!upl_valid_page(pl, i)) {
                        CLR(bp->nb_flags, NB_CACHE);
                        continue;
                }
                if (!upl_valid_page(pl, i)) {
                        CLR(bp->nb_flags, NB_CACHE);
                        continue;
                }

-               NBPGVALID_SET(bp,i);
-               if (upl_dirty_page(pl, i))
+               NBPGVALID_SET(bp, i);
+               if (upl_dirty_page(pl, i)) {

                        NBPGDIRTY_SET(bp, i);
                        NBPGDIRTY_SET(bp, i);

+               }

        }
        fileoffset = NBOFF(bp);
        if (ISSET(bp->nb_flags, NB_CACHE)) {
                bp->nb_validoff = 0;
                bp->nb_validend = bp->nb_bufsize;
        }
        fileoffset = NBOFF(bp);
        if (ISSET(bp->nb_flags, NB_CACHE)) {
                bp->nb_validoff = 0;
                bp->nb_validend = bp->nb_bufsize;

-               if (fileoffset + bp->nb_validend > filesize)
+               if (fileoffset + bp->nb_validend > filesize) {

                        bp->nb_validend = filesize - fileoffset;
                        bp->nb_validend = filesize - fileoffset;

+               }

        } else {
                bp->nb_validoff = bp->nb_validend = -1;
        }
        } else {
                bp->nb_validoff = bp->nb_validend = -1;
        }


@@ -485,18 +573,22 @@ nfs_buf_map(struct nfsbuf *bp)
 {
        kern_return_t kret;
 
 {
        kern_return_t kret;
 

-       if (bp->nb_data)
-               return (0);
-       if (!ISSET(bp->nb_flags, NB_PAGELIST))
-               return (EINVAL);
+       if (bp->nb_data) {
+               return 0;
+       }
+       if (!ISSET(bp->nb_flags, NB_PAGELIST)) {
+               return EINVAL;
+       }

 
        kret = ubc_upl_map(bp->nb_pagelist, (vm_offset_t *)&(bp->nb_data));
 
        kret = ubc_upl_map(bp->nb_pagelist, (vm_offset_t *)&(bp->nb_data));

-       if (kret != KERN_SUCCESS)
+       if (kret != KERN_SUCCESS) {

                panic("nfs_buf_map: ubc_upl_map() failed with (%d)", kret);
                panic("nfs_buf_map: ubc_upl_map() failed with (%d)", kret);

-       if (bp->nb_data == 0)
+       }
+       if (bp->nb_data == 0) {

                panic("ubc_upl_map mapped 0");
                panic("ubc_upl_map mapped 0");

+       }

        FSDBG(540, bp, bp->nb_flags, NBOFF(bp), bp->nb_data);
        FSDBG(540, bp, bp->nb_flags, NBOFF(bp), bp->nb_data);

-       return (0);
+       return 0;

 }
 
 /*
 }
 
 /*


@@ -511,21 +603,24 @@ nfs_buf_map(struct nfsbuf *bp)
 void
 nfs_buf_normalize_valid_range(nfsnode_t np, struct nfsbuf *bp)
 {
 void
 nfs_buf_normalize_valid_range(nfsnode_t np, struct nfsbuf *bp)
 {

-       int pg, npg;
+       off_t pg, npg;

        /* pull validoff back to start of contiguous valid page range */
        /* pull validoff back to start of contiguous valid page range */

-       pg = bp->nb_validoff/PAGE_SIZE;
-       while (pg >= 0 && NBPGVALID(bp,pg))
+       pg = bp->nb_validoff / PAGE_SIZE;
+       while (pg >= 0 && NBPGVALID(bp, pg)) {

                pg--;
                pg--;

-       bp->nb_validoff = (pg+1) * PAGE_SIZE;
+       }
+       bp->nb_validoff = (pg + 1) * PAGE_SIZE;

        /* push validend forward to end of contiguous valid page range */
        /* push validend forward to end of contiguous valid page range */

-       npg = bp->nb_bufsize/PAGE_SIZE;
-       pg = bp->nb_validend/PAGE_SIZE;
-       while (pg < npg && NBPGVALID(bp,pg))
+       npg = bp->nb_bufsize / PAGE_SIZE;
+       pg = bp->nb_validend / PAGE_SIZE;
+       while (pg < npg && NBPGVALID(bp, pg)) {

                pg++;
                pg++;

+       }

        bp->nb_validend = pg * PAGE_SIZE;
        /* clip to EOF */
        bp->nb_validend = pg * PAGE_SIZE;
        /* clip to EOF */

-       if (NBOFF(bp) + bp->nb_validend > (off_t)np->n_size)
+       if (NBOFF(bp) + bp->nb_validend > (off_t)np->n_size) {

                bp->nb_validend = np->n_size % bp->nb_bufsize;
                bp->nb_validend = np->n_size % bp->nb_bufsize;

+       }

 }
 
 /*
 }
 
 /*


@@ -543,17 +638,21 @@ nfs_buf_delwri_service(void)
                np = bp->nb_np;
                nfs_buf_remfree(bp);
                nfs_buf_refget(bp);
                np = bp->nb_np;
                nfs_buf_remfree(bp);
                nfs_buf_refget(bp);

-               while ((error = nfs_buf_acquire(bp, 0, 0, 0)) == EAGAIN);
+               while ((error = nfs_buf_acquire(bp, 0, 0, 0)) == EAGAIN) {
+                       ;
+               }

                nfs_buf_refrele(bp);
                nfs_buf_refrele(bp);

-               if (error)
+               if (error) {

                        break;
                        break;

+               }

                if (!bp->nb_np) {
                        /* buffer is no longer valid */
                        nfs_buf_drop(bp);
                        continue;
                }
                if (!bp->nb_np) {
                        /* buffer is no longer valid */
                        nfs_buf_drop(bp);
                        continue;
                }

-               if (ISSET(bp->nb_flags, NB_NEEDCOMMIT))
+               if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {

                        nfs_buf_check_write_verifier(np, bp);
                        nfs_buf_check_write_verifier(np, bp);

+               }

                if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {
                        /* put buffer at end of delwri list */
                        TAILQ_INSERT_TAIL(&nfsbufdelwri, bp, nb_free);
                if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {
                        /* put buffer at end of delwri list */
                        TAILQ_INSERT_TAIL(&nfsbufdelwri, bp, nb_free);


@@ -577,7 +676,7 @@ nfs_buf_delwri_service(void)
 void
 nfs_buf_delwri_thread(__unused void *arg, __unused wait_result_t wr)
 {
 void
 nfs_buf_delwri_thread(__unused void *arg, __unused wait_result_t wr)
 {

-       struct timespec ts = { 30, 0 };
+       struct timespec ts = { .tv_sec = 30, .tv_nsec = 0 };

        int error = 0;
 
        lck_mtx_lock(nfs_buf_mutex);
        int error = 0;
 
        lck_mtx_lock(nfs_buf_mutex);


@@ -597,20 +696,25 @@ nfs_buf_delwri_thread(__unused void *arg, __unused wait_result_t wr)
 void
 nfs_buf_delwri_push(int locked)
 {
 void
 nfs_buf_delwri_push(int locked)
 {

-       if (TAILQ_EMPTY(&nfsbufdelwri))
+       if (TAILQ_EMPTY(&nfsbufdelwri)) {

                return;
                return;

-       if (!locked)
+       }
+       if (!locked) {

                lck_mtx_lock(nfs_buf_mutex);
                lck_mtx_lock(nfs_buf_mutex);

+       }

        /* wake up the delayed write service thread */
        /* wake up the delayed write service thread */

-       if (nfsbufdelwrithd)
+       if (nfsbufdelwrithd) {

                wakeup(&nfsbufdelwrithd);
                wakeup(&nfsbufdelwrithd);

-       else if (kernel_thread_start(nfs_buf_delwri_thread, NULL, &nfsbufdelwrithd) == KERN_SUCCESS)
+       } else if (kernel_thread_start(nfs_buf_delwri_thread, NULL, &nfsbufdelwrithd) == KERN_SUCCESS) {

                thread_deallocate(nfsbufdelwrithd);
                thread_deallocate(nfsbufdelwrithd);

+       }

        /* otherwise, try to do some of the work ourselves */
        /* otherwise, try to do some of the work ourselves */

-       if (!nfsbufdelwrithd)
+       if (!nfsbufdelwrithd) {

                nfs_buf_delwri_service();
                nfs_buf_delwri_service();

-       if (!locked)
+       }
+       if (!locked) {

                lck_mtx_unlock(nfs_buf_mutex);
                lck_mtx_unlock(nfs_buf_mutex);

+       }

 }
 
 /*
 }
 
 /*


@@ -654,12 +758,13 @@ nfs_buf_get(
        *bpp = NULL;
 
        bufsize = size;
        *bpp = NULL;
 
        bufsize = size;

-       if (bufsize > NFS_MAXBSIZE)
+       if (bufsize > NFS_MAXBSIZE) {

                panic("nfs_buf_get: buffer larger than NFS_MAXBSIZE requested");
                panic("nfs_buf_get: buffer larger than NFS_MAXBSIZE requested");

+       }

 
 

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                FSDBG_BOT(541, np, blkno, 0, ENXIO);
                FSDBG_BOT(541, np, blkno, 0, ENXIO);

-               return (ENXIO);
+               return ENXIO;

        }
 
        if (!UBCINFOEXISTS(vp)) {
        }
 
        if (!UBCINFOEXISTS(vp)) {


@@ -684,6 +789,22 @@ nfs_buf_get(
 loop:
        lck_mtx_lock(nfs_buf_mutex);
 
 loop:
        lck_mtx_lock(nfs_buf_mutex);
 

+       /* wait for any buffer invalidation/flushing to complete */
+       while (np->n_bflag & NBINVALINPROG) {
+               np->n_bflag |= NBINVALWANT;
+               ts.tv_sec = 2;
+               ts.tv_nsec = 0;
+               msleep(&np->n_bflag, nfs_buf_mutex, slpflag, "nfs_buf_get_invalwait", &ts);
+               if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
+                       lck_mtx_unlock(nfs_buf_mutex);
+                       FSDBG_BOT(541, np, blkno, 0, error);
+                       return error;
+               }
+               if (np->n_bflag & NBINVALINPROG) {
+                       slpflag = 0;
+               }
+       }
+

        /* check for existence of nfsbuf in cache */
        if ((bp = nfs_buf_incore(np, blkno))) {
                /* if busy, set wanted and wait */
        /* check for existence of nfsbuf in cache */
        if ((bp = nfs_buf_incore(np, blkno))) {
                /* if busy, set wanted and wait */


@@ -691,38 +812,40 @@ loop:
                        if (flags & NBLK_NOWAIT) {
                                lck_mtx_unlock(nfs_buf_mutex);
                                FSDBG_BOT(541, np, blkno, bp, 0xbcbcbcbc);
                        if (flags & NBLK_NOWAIT) {
                                lck_mtx_unlock(nfs_buf_mutex);
                                FSDBG_BOT(541, np, blkno, bp, 0xbcbcbcbc);

-                               return (0);
+                               return 0;

                        }
                        FSDBG_TOP(543, np, blkno, bp, bp->nb_flags);
                        SET(bp->nb_lflags, NBL_WANTED);
 
                        ts.tv_sec = 2;
                        ts.tv_nsec = 0;
                        }
                        FSDBG_TOP(543, np, blkno, bp, bp->nb_flags);
                        SET(bp->nb_lflags, NBL_WANTED);
 
                        ts.tv_sec = 2;
                        ts.tv_nsec = 0;

-                       msleep(bp, nfs_buf_mutex, slpflag|(PRIBIO+1)|PDROP,
-                                       "nfsbufget", (slpflag == PCATCH) ? NULL : &ts);
+                       msleep(bp, nfs_buf_mutex, slpflag | (PRIBIO + 1) | PDROP,
+                           "nfsbufget", (slpflag == PCATCH) ? NULL : &ts);

                        slpflag = 0;
                        FSDBG_BOT(543, np, blkno, bp, bp->nb_flags);
                        if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                                FSDBG_BOT(541, np, blkno, 0, error);
                        slpflag = 0;
                        FSDBG_BOT(543, np, blkno, bp, bp->nb_flags);
                        if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                                FSDBG_BOT(541, np, blkno, 0, error);

-                               return (error);
+                               return error;

                        }
                        goto loop;
                }
                        }
                        goto loop;
                }

-               if (bp->nb_bufsize != bufsize)
+               if (bp->nb_bufsize != bufsize) {

                        panic("nfsbuf size mismatch");
                        panic("nfsbuf size mismatch");

+               }

                SET(bp->nb_lflags, NBL_BUSY);
                SET(bp->nb_flags, NB_CACHE);
                nfs_buf_remfree(bp);
                /* additional paranoia: */
                SET(bp->nb_lflags, NBL_BUSY);
                SET(bp->nb_flags, NB_CACHE);
                nfs_buf_remfree(bp);
                /* additional paranoia: */

-               if (ISSET(bp->nb_flags, NB_PAGELIST))
+               if (ISSET(bp->nb_flags, NB_PAGELIST)) {

                        panic("pagelist buffer was not busy");
                        panic("pagelist buffer was not busy");

+               }

                goto buffer_setup;
        }
 
        if (flags & NBLK_ONLYVALID) {
                lck_mtx_unlock(nfs_buf_mutex);
                FSDBG_BOT(541, np, blkno, 0, 0x0000cace);
                goto buffer_setup;
        }
 
        if (flags & NBLK_ONLYVALID) {
                lck_mtx_unlock(nfs_buf_mutex);
                FSDBG_BOT(541, np, blkno, 0, 0x0000cace);

-               return (0);
+               return 0;

        }
 
        /*
        }
 
        /*


@@ -750,28 +873,31 @@ loop:
                /* if the next LRU or META buffer is invalid or stale, use it */
                lrubp = TAILQ_FIRST(&nfsbuffree);
                if (lrubp && (!NBUFSTAMPVALID(lrubp) ||
                /* if the next LRU or META buffer is invalid or stale, use it */
                lrubp = TAILQ_FIRST(&nfsbuffree);
                if (lrubp && (!NBUFSTAMPVALID(lrubp) ||

-                   ((lrubp->nb_timestamp + NFSBUF_LRU_STALE) < now.tv_sec)))
+                   ((lrubp->nb_timestamp + NFSBUF_LRU_STALE) < now.tv_sec))) {

                        bp = lrubp;
                        bp = lrubp;

+               }

                metabp = TAILQ_FIRST(&nfsbuffreemeta);
                if (!bp && metabp && (!NBUFSTAMPVALID(metabp) ||
                metabp = TAILQ_FIRST(&nfsbuffreemeta);
                if (!bp && metabp && (!NBUFSTAMPVALID(metabp) ||

-                   ((metabp->nb_timestamp + NFSBUF_META_STALE) < now.tv_sec)))
+                   ((metabp->nb_timestamp + NFSBUF_META_STALE) < now.tv_sec))) {

                        bp = metabp;
                        bp = metabp;

+               }

 
                if (!bp && (nfsbufcnt >= nfsbufmax)) {
                        /* we've already allocated all bufs, so */
                        /* choose the buffer that'll go stale first */
 
                if (!bp && (nfsbufcnt >= nfsbufmax)) {
                        /* we've already allocated all bufs, so */
                        /* choose the buffer that'll go stale first */

-                       if (!metabp)
+                       if (!metabp) {

                                bp = lrubp;
                                bp = lrubp;

-                       else if (!lrubp)
+                       } else if (!lrubp) {

                                bp = metabp;
                                bp = metabp;

-                       else {
-                               int32_t lru_stale_time, meta_stale_time;
+                       } else {
+                               time_t lru_stale_time, meta_stale_time;

                                lru_stale_time = lrubp->nb_timestamp + NFSBUF_LRU_STALE;
                                meta_stale_time = metabp->nb_timestamp + NFSBUF_META_STALE;
                                lru_stale_time = lrubp->nb_timestamp + NFSBUF_LRU_STALE;
                                meta_stale_time = metabp->nb_timestamp + NFSBUF_META_STALE;

-                               if (lru_stale_time <= meta_stale_time)
+                               if (lru_stale_time <= meta_stale_time) {

                                        bp = lrubp;
                                        bp = lrubp;

-                               else
+                               } else {

                                        bp = metabp;
                                        bp = metabp;

+                               }

                        }
                }
        }
                        }
                }
        }


@@ -780,8 +906,9 @@ loop:
                /* we have a buffer to reuse */
                FSDBG(544, np, blkno, bp, bp->nb_flags);
                nfs_buf_remfree(bp);
                /* we have a buffer to reuse */
                FSDBG(544, np, blkno, bp, bp->nb_flags);
                nfs_buf_remfree(bp);

-               if (ISSET(bp->nb_flags, NB_DELWRI))
+               if (ISSET(bp->nb_flags, NB_DELWRI)) {

                        panic("nfs_buf_get: delwri");
                        panic("nfs_buf_get: delwri");

+               }

                SET(bp->nb_lflags, NBL_BUSY);
                /* disassociate buffer from previous nfsnode */
                if (bp->nb_np) {
                SET(bp->nb_lflags, NBL_BUSY);
                /* disassociate buffer from previous nfsnode */
                if (bp->nb_np) {


@@ -793,17 +920,20 @@ loop:
                }
                LIST_REMOVE(bp, nb_hash);
                /* nuke any creds we're holding */
                }
                LIST_REMOVE(bp, nb_hash);
                /* nuke any creds we're holding */

-               if (IS_VALID_CRED(bp->nb_rcred))
+               if (IS_VALID_CRED(bp->nb_rcred)) {

                        kauth_cred_unref(&bp->nb_rcred);
                        kauth_cred_unref(&bp->nb_rcred);

-               if (IS_VALID_CRED(bp->nb_wcred))
+               }
+               if (IS_VALID_CRED(bp->nb_wcred)) {

                        kauth_cred_unref(&bp->nb_wcred);
                        kauth_cred_unref(&bp->nb_wcred);

+               }

                /* if buf will no longer be NB_META, dump old buffer */
                if (operation == NBLK_META) {
                /* if buf will no longer be NB_META, dump old buffer */
                if (operation == NBLK_META) {

-                       if (!ISSET(bp->nb_flags, NB_META))
+                       if (!ISSET(bp->nb_flags, NB_META)) {

                                nfsbufmetacnt++;
                                nfsbufmetacnt++;

+                       }

                } else if (ISSET(bp->nb_flags, NB_META)) {
                        if (bp->nb_data) {
                } else if (ISSET(bp->nb_flags, NB_META)) {
                        if (bp->nb_data) {

-                               kfree(bp->nb_data, bp->nb_bufsize);
+                               kheap_free(KHEAP_DATA_BUFFERS, bp->nb_data, bp->nb_bufsize);

                                bp->nb_data = NULL;
                        }
                        nfsbufmetacnt--;
                                bp->nb_data = NULL;
                        }
                        nfsbufmetacnt--;


@@ -812,20 +942,15 @@ loop:
                bp->nb_error = 0;
                bp->nb_validoff = bp->nb_validend = -1;
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
                bp->nb_error = 0;
                bp->nb_validoff = bp->nb_validend = -1;
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;

-               bp->nb_valid = 0;
-               bp->nb_dirty = 0;
+               NBPGS_ERASE(&bp->nb_valid);
+               NBPGS_ERASE(&bp->nb_dirty);

                bp->nb_verf = 0;
        } else {
                /* no buffer to reuse */
                if ((nfsbufcnt < nfsbufmax) &&
                    ((operation != NBLK_META) || (nfsbufmetacnt < nfsbufmetamax))) {
                        /* just alloc a new one */
                bp->nb_verf = 0;
        } else {
                /* no buffer to reuse */
                if ((nfsbufcnt < nfsbufmax) &&
                    ((operation != NBLK_META) || (nfsbufmetacnt < nfsbufmetamax))) {
                        /* just alloc a new one */

-                       MALLOC(bp, struct nfsbuf *, sizeof(struct nfsbuf), M_TEMP, M_WAITOK);
-                       if (!bp) {
-                               lck_mtx_unlock(nfs_buf_mutex);
-                               FSDBG_BOT(541, np, blkno, 0, error);
-                               return (ENOMEM);
-                       }
+                       bp = zalloc(nfsbuf_zone);

                        nfsbufcnt++;
 
                        /*
                        nfsbufcnt++;
 
                        /*


@@ -835,14 +960,17 @@ loop:
                        if (nfsbufcnt > nfsbufmin && !nfs_buf_timer_on) {
                                nfs_buf_timer_on = 1;
                                nfs_interval_timer_start(nfs_buf_timer_call,
                        if (nfsbufcnt > nfsbufmin && !nfs_buf_timer_on) {
                                nfs_buf_timer_on = 1;
                                nfs_interval_timer_start(nfs_buf_timer_call,

-                                       NFSBUF_FREE_PERIOD * 1000);
+                                   NFSBUF_FREE_PERIOD * 1000);

                        }
 
                        }
 

-                       if (operation == NBLK_META)
+                       if (operation == NBLK_META) {

                                nfsbufmetacnt++;
                                nfsbufmetacnt++;

+                       }

                        NFSBUFCNTCHK();
                        /* init nfsbuf */
                        bzero(bp, sizeof(*bp));
                        NFSBUFCNTCHK();
                        /* init nfsbuf */
                        bzero(bp, sizeof(*bp));

+                       os_ref_init(&bp->nb_refs, NULL);
+

                        bp->nb_free.tqe_next = NFSNOLIST;
                        bp->nb_validoff = bp->nb_validend = -1;
                        FSDBG(545, np, blkno, bp, 0);
                        bp->nb_free.tqe_next = NFSNOLIST;
                        bp->nb_validoff = bp->nb_validend = -1;
                        FSDBG(545, np, blkno, bp, 0);


@@ -854,11 +982,11 @@ loop:
                        nfs_buf_delwri_push(1);
 
                        nfsneedbuffer = 1;
                        nfs_buf_delwri_push(1);
 
                        nfsneedbuffer = 1;

-                       msleep(&nfsneedbuffer, nfs_buf_mutex, PCATCH|PDROP, "nfsbufget", NULL);
+                       msleep(&nfsneedbuffer, nfs_buf_mutex, PCATCH | PDROP, "nfsbufget", NULL);

                        FSDBG_BOT(546, np, blkno, nfsbufcnt, nfsbufmax);
                        if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                                FSDBG_BOT(541, np, blkno, 0, error);
                        FSDBG_BOT(546, np, blkno, nfsbufcnt, nfsbufmax);
                        if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                                FSDBG_BOT(541, np, blkno, 0, error);

-                               return (error);
+                               return error;

                        }
                        goto loop;
                }
                        }
                        goto loop;
                }


@@ -883,16 +1011,18 @@ buffer_setup:
        case NBLK_META:
                SET(bp->nb_flags, NB_META);
                if ((bp->nb_bufsize != bufsize) && bp->nb_data) {
        case NBLK_META:
                SET(bp->nb_flags, NB_META);
                if ((bp->nb_bufsize != bufsize) && bp->nb_data) {

-                       kfree(bp->nb_data, bp->nb_bufsize);
+                       kheap_free(KHEAP_DATA_BUFFERS, bp->nb_data, bp->nb_bufsize);

                        bp->nb_data = NULL;
                        bp->nb_validoff = bp->nb_validend = -1;
                        bp->nb_dirtyoff = bp->nb_dirtyend = 0;
                        bp->nb_data = NULL;
                        bp->nb_validoff = bp->nb_validend = -1;
                        bp->nb_dirtyoff = bp->nb_dirtyend = 0;

-                       bp->nb_valid = 0;
-                       bp->nb_dirty = 0;
+                       NBPGS_ERASE(&bp->nb_valid);
+                       NBPGS_ERASE(&bp->nb_dirty);

                        CLR(bp->nb_flags, NB_CACHE);
                }
                        CLR(bp->nb_flags, NB_CACHE);
                }

-               if (!bp->nb_data)
-                       bp->nb_data = kalloc(bufsize);
+               if (!bp->nb_data) {
+                       bp->nb_data = kheap_alloc(KHEAP_DATA_BUFFERS,
+                           bufsize, Z_WAITOK);
+               }

                if (!bp->nb_data) {
                        /* Ack! couldn't allocate the data buffer! */
                        /* clean up buffer and return error */
                if (!bp->nb_data) {
                        /* Ack! couldn't allocate the data buffer! */
                        /* clean up buffer and return error */


@@ -902,13 +1032,14 @@ buffer_setup:
                        bp->nb_np = NULL;
                        /* invalidate usage timestamp to allow immediate freeing */
                        NBUFSTAMPINVALIDATE(bp);
                        bp->nb_np = NULL;
                        /* invalidate usage timestamp to allow immediate freeing */
                        NBUFSTAMPINVALIDATE(bp);

-                       if (bp->nb_free.tqe_next != NFSNOLIST)
+                       if (bp->nb_free.tqe_next != NFSNOLIST) {

                                panic("nfsbuf on freelist");
                                panic("nfsbuf on freelist");

+                       }

                        TAILQ_INSERT_HEAD(&nfsbuffree, bp, nb_free);
                        nfsbuffreecnt++;
                        lck_mtx_unlock(nfs_buf_mutex);
                        FSDBG_BOT(541, np, blkno, 0xb00, ENOMEM);
                        TAILQ_INSERT_HEAD(&nfsbuffree, bp, nb_free);
                        nfsbuffreecnt++;
                        lck_mtx_unlock(nfs_buf_mutex);
                        FSDBG_BOT(541, np, blkno, 0xb00, ENOMEM);

-                       return (ENOMEM);
+                       return ENOMEM;

                }
                bp->nb_bufsize = bufsize;
                break;
                }
                bp->nb_bufsize = bufsize;
                break;


@@ -924,8 +1055,9 @@ buffer_setup:
                } else {
                        CLR(bp->nb_flags, NB_READ);
                }
                } else {
                        CLR(bp->nb_flags, NB_READ);
                }

-               if (bufsize < PAGE_SIZE)
+               if (bufsize < PAGE_SIZE) {

                        bufsize = PAGE_SIZE;
                        bufsize = PAGE_SIZE;

+               }

                bp->nb_bufsize = bufsize;
                bp->nb_validoff = bp->nb_validend = -1;
 
                bp->nb_bufsize = bufsize;
                bp->nb_validoff = bp->nb_validend = -1;
 


@@ -941,13 +1073,14 @@ buffer_setup:
                                bp->nb_np = NULL;
                                /* invalidate usage timestamp to allow immediate freeing */
                                NBUFSTAMPINVALIDATE(bp);
                                bp->nb_np = NULL;
                                /* invalidate usage timestamp to allow immediate freeing */
                                NBUFSTAMPINVALIDATE(bp);

-                               if (bp->nb_free.tqe_next != NFSNOLIST)
+                               if (bp->nb_free.tqe_next != NFSNOLIST) {

                                        panic("nfsbuf on freelist");
                                        panic("nfsbuf on freelist");

+                               }

                                TAILQ_INSERT_HEAD(&nfsbuffree, bp, nb_free);
                                nfsbuffreecnt++;
                                lck_mtx_unlock(nfs_buf_mutex);
                                FSDBG_BOT(541, np, blkno, 0x2bc, EIO);
                                TAILQ_INSERT_HEAD(&nfsbuffree, bp, nb_free);
                                nfsbuffreecnt++;
                                lck_mtx_unlock(nfs_buf_mutex);
                                FSDBG_BOT(541, np, blkno, 0x2bc, EIO);

-                               return (EIO);
+                               return EIO;

                        }
                        nfs_buf_upl_check(bp);
                }
                        }
                        nfs_buf_upl_check(bp);
                }


@@ -961,7 +1094,7 @@ buffer_setup:
 
        FSDBG_BOT(541, np, blkno, bp, bp->nb_flags);
 
 
        FSDBG_BOT(541, np, blkno, bp, bp->nb_flags);
 

-       return (0);
+       return 0;

 }
 
 void
 }
 
 void


@@ -984,52 +1117,58 @@ nfs_buf_release(struct nfsbuf *bp, int freeup)
 
                if (!ISSET(bp->nb_flags, NB_PAGELIST) && !ISSET(bp->nb_flags, NB_INVAL)) {
                        rv = nfs_buf_upl_setup(bp);
 
                if (!ISSET(bp->nb_flags, NB_PAGELIST) && !ISSET(bp->nb_flags, NB_INVAL)) {
                        rv = nfs_buf_upl_setup(bp);

-                       if (rv)
+                       if (rv) {

                                printf("nfs_buf_release: upl create failed %d\n", rv);
                                printf("nfs_buf_release: upl create failed %d\n", rv);

-                       else
+                       } else {

                                nfs_buf_upl_check(bp);
                                nfs_buf_upl_check(bp);

+                       }

                }
                upl = bp->nb_pagelist;
                }
                upl = bp->nb_pagelist;

-               if (!upl)
+               if (!upl) {

                        goto pagelist_cleanup_done;
                        goto pagelist_cleanup_done;

+               }

                if (bp->nb_data) {
                if (bp->nb_data) {

-                       if (ubc_upl_unmap(upl) != KERN_SUCCESS)
+                       if (ubc_upl_unmap(upl) != KERN_SUCCESS) {

                                panic("ubc_upl_unmap failed");
                                panic("ubc_upl_unmap failed");

+                       }

                        bp->nb_data = NULL;
                }
                /*
                 * Abort the pages on error or: if this is an invalid or
                 * non-needcommit nocache buffer AND no pages are dirty.
                 */
                        bp->nb_data = NULL;
                }
                /*
                 * Abort the pages on error or: if this is an invalid or
                 * non-needcommit nocache buffer AND no pages are dirty.
                 */

-               if (ISSET(bp->nb_flags, NB_ERROR) || (!bp->nb_dirty && (ISSET(bp->nb_flags, NB_INVAL) ||
+               if (ISSET(bp->nb_flags, NB_ERROR) || (!nfs_buf_pgs_is_set(&bp->nb_dirty) && (ISSET(bp->nb_flags, NB_INVAL) ||

                    (ISSET(bp->nb_flags, NB_NOCACHE) && !ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI)))))) {
                    (ISSET(bp->nb_flags, NB_NOCACHE) && !ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI)))))) {

-                       if (ISSET(bp->nb_flags, (NB_READ | NB_INVAL | NB_NOCACHE)))
+                       if (ISSET(bp->nb_flags, (NB_READ | NB_INVAL | NB_NOCACHE))) {

                                upl_flags = UPL_ABORT_DUMP_PAGES;
                                upl_flags = UPL_ABORT_DUMP_PAGES;

-                       else
+                       } else {

                                upl_flags = 0;
                                upl_flags = 0;

+                       }

                        ubc_upl_abort(upl, upl_flags);
                        goto pagelist_cleanup_done;
                }
                        ubc_upl_abort(upl, upl_flags);
                        goto pagelist_cleanup_done;
                }

-               for (i=0; i <= (bp->nb_bufsize - 1)/PAGE_SIZE; i++) {
-                       if (!NBPGVALID(bp,i))
+               for (i = 0; i <= (bp->nb_bufsize - 1) / PAGE_SIZE; i++) {
+                       if (!NBPGVALID(bp, i)) {

                                ubc_upl_abort_range(upl,
                                ubc_upl_abort_range(upl,

-                                       i*PAGE_SIZE, PAGE_SIZE,
-                                       UPL_ABORT_DUMP_PAGES |
-                                       UPL_ABORT_FREE_ON_EMPTY);
-                       else {
-                               if (NBPGDIRTY(bp,i))
+                                   i * PAGE_SIZE, PAGE_SIZE,
+                                   UPL_ABORT_DUMP_PAGES |
+                                   UPL_ABORT_FREE_ON_EMPTY);
+                       } else {
+                               if (NBPGDIRTY(bp, i)) {

                                        upl_flags = UPL_COMMIT_SET_DIRTY;
                                        upl_flags = UPL_COMMIT_SET_DIRTY;

-                               else
+                               } else {

                                        upl_flags = UPL_COMMIT_CLEAR_DIRTY;
                                        upl_flags = UPL_COMMIT_CLEAR_DIRTY;

-                               
-                               if (!ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI)))
+                               }
+
+                               if (!ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI))) {

                                        upl_flags |= UPL_COMMIT_CLEAR_PRECIOUS;
                                        upl_flags |= UPL_COMMIT_CLEAR_PRECIOUS;

+                               }

 
                                ubc_upl_commit_range(upl,
 
                                ubc_upl_commit_range(upl,

-                                       i*PAGE_SIZE, PAGE_SIZE,
-                                       upl_flags |
-                                       UPL_COMMIT_INACTIVATE |
-                                       UPL_COMMIT_FREE_ON_EMPTY);
+                                   i * PAGE_SIZE, PAGE_SIZE,
+                                   upl_flags |
+                                   UPL_COMMIT_INACTIVATE |
+                                   UPL_COMMIT_FREE_ON_EMPTY);

                        }
                }
 pagelist_cleanup_done:
                        }
                }
 pagelist_cleanup_done:


@@ -1038,11 +1177,13 @@ pagelist_cleanup_done:
                        off_t start, end;
                        start = trunc_page_64(np->n_size) + PAGE_SIZE_64;
                        end = trunc_page_64(NBOFF(bp) + bp->nb_bufsize);
                        off_t start, end;
                        start = trunc_page_64(np->n_size) + PAGE_SIZE_64;
                        end = trunc_page_64(NBOFF(bp) + bp->nb_bufsize);

-                       if (start < NBOFF(bp))
+                       if (start < NBOFF(bp)) {

                                start = NBOFF(bp);
                                start = NBOFF(bp);

+                       }

                        if (end > start) {
                        if (end > start) {

-                               if (!(rv = ubc_sync_range(vp, start, end, UBC_INVALIDATE)))
-                                       printf("nfs_buf_release(): ubc_sync_range failed!\n");
+                               if ((rv = ubc_msync(vp, start, end, NULL, UBC_INVALIDATE))) {
+                                       printf("nfs_buf_release(): ubc_msync failed!, error %d\n", rv);
+                               }

                        }
                }
                CLR(bp->nb_flags, NB_PAGELIST);
                        }
                }
                CLR(bp->nb_flags, NB_PAGELIST);


@@ -1066,8 +1207,9 @@ pagelist_cleanup_done:
 
        /* If it's non-needcommit nocache, or an error, mark it invalid. */
        if (ISSET(bp->nb_flags, NB_ERROR) ||
 
        /* If it's non-needcommit nocache, or an error, mark it invalid. */
        if (ISSET(bp->nb_flags, NB_ERROR) ||

-           (ISSET(bp->nb_flags, NB_NOCACHE) && !ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI))))
+           (ISSET(bp->nb_flags, NB_NOCACHE) && !ISSET(bp->nb_flags, (NB_NEEDCOMMIT | NB_DELWRI)))) {

                SET(bp->nb_flags, NB_INVAL);
                SET(bp->nb_flags, NB_INVAL);

+       }

 
        if ((bp->nb_bufsize <= 0) || ISSET(bp->nb_flags, NB_INVAL)) {
                /* If it's invalid or empty, dissociate it from its nfsnode */
 
        if ((bp->nb_bufsize <= 0) || ISSET(bp->nb_flags, NB_INVAL)) {
                /* If it's invalid or empty, dissociate it from its nfsnode */


@@ -1087,8 +1229,9 @@ pagelist_cleanup_done:
                /* invalidate usage timestamp to allow immediate freeing */
                NBUFSTAMPINVALIDATE(bp);
                /* put buffer at head of free list */
                /* invalidate usage timestamp to allow immediate freeing */
                NBUFSTAMPINVALIDATE(bp);
                /* put buffer at head of free list */

-               if (bp->nb_free.tqe_next != NFSNOLIST)
+               if (bp->nb_free.tqe_next != NFSNOLIST) {

                        panic("nfsbuf on freelist");
                        panic("nfsbuf on freelist");

+               }

                SET(bp->nb_flags, NB_INVAL);
                if (ISSET(bp->nb_flags, NB_META)) {
                        TAILQ_INSERT_HEAD(&nfsbuffreemeta, bp, nb_free);
                SET(bp->nb_flags, NB_INVAL);
                if (ISSET(bp->nb_flags, NB_META)) {
                        TAILQ_INSERT_HEAD(&nfsbuffreemeta, bp, nb_free);


@@ -1099,8 +1242,9 @@ pagelist_cleanup_done:
                }
        } else if (ISSET(bp->nb_flags, NB_DELWRI)) {
                /* put buffer at end of delwri list */
                }
        } else if (ISSET(bp->nb_flags, NB_DELWRI)) {
                /* put buffer at end of delwri list */

-               if (bp->nb_free.tqe_next != NFSNOLIST)
+               if (bp->nb_free.tqe_next != NFSNOLIST) {

                        panic("nfsbuf on freelist");
                        panic("nfsbuf on freelist");

+               }

                TAILQ_INSERT_TAIL(&nfsbufdelwri, bp, nb_free);
                nfsbufdelwricnt++;
                freeup = 0;
                TAILQ_INSERT_TAIL(&nfsbufdelwri, bp, nb_free);
                nfsbufdelwricnt++;
                freeup = 0;


@@ -1109,8 +1253,9 @@ pagelist_cleanup_done:
                microuptime(&now);
                bp->nb_timestamp = now.tv_sec;
                /* put buffer at end of free list */
                microuptime(&now);
                bp->nb_timestamp = now.tv_sec;
                /* put buffer at end of free list */

-               if (bp->nb_free.tqe_next != NFSNOLIST)
+               if (bp->nb_free.tqe_next != NFSNOLIST) {

                        panic("nfsbuf on freelist");
                        panic("nfsbuf on freelist");

+               }

                if (ISSET(bp->nb_flags, NB_META)) {
                        TAILQ_INSERT_TAIL(&nfsbuffreemeta, bp, nb_free);
                        nfsbuffreemetacnt++;
                if (ISSET(bp->nb_flags, NB_META)) {
                        TAILQ_INSERT_TAIL(&nfsbuffreemeta, bp, nb_free);
                        nfsbuffreemetacnt++;


@@ -1130,14 +1275,18 @@ pagelist_cleanup_done:
 
        lck_mtx_unlock(nfs_buf_mutex);
 
 
        lck_mtx_unlock(nfs_buf_mutex);
 

-       if (wakeup_needbuffer)
+       if (wakeup_needbuffer) {

                wakeup(&nfsneedbuffer);
                wakeup(&nfsneedbuffer);

-       if (wakeup_buffer)
+       }
+       if (wakeup_buffer) {

                wakeup(bp);
                wakeup(bp);

-       if (wakeup_nbdwrite)
+       }
+       if (wakeup_nbdwrite) {

                wakeup(&nfs_nbdwrite);
                wakeup(&nfs_nbdwrite);

-       if (freeup)
+       }
+       if (freeup) {

                NFS_BUF_FREEUP();
                NFS_BUF_FREEUP();

+       }

 }
 
 /*
 }
 
 /*


@@ -1151,8 +1300,9 @@ nfs_buf_iowait(struct nfsbuf *bp)
 
        lck_mtx_lock(nfs_buf_mutex);
 
 
        lck_mtx_lock(nfs_buf_mutex);
 

-       while (!ISSET(bp->nb_flags, NB_DONE))
+       while (!ISSET(bp->nb_flags, NB_DONE)) {

                msleep(bp, nfs_buf_mutex, PRIBIO + 1, "nfs_buf_iowait", NULL);
                msleep(bp, nfs_buf_mutex, PRIBIO + 1, "nfs_buf_iowait", NULL);

+       }

 
        lck_mtx_unlock(nfs_buf_mutex);
 
 
        lck_mtx_unlock(nfs_buf_mutex);
 


@@ -1161,10 +1311,11 @@ nfs_buf_iowait(struct nfsbuf *bp)
        /* check for interruption of I/O, then errors. */
        if (ISSET(bp->nb_flags, NB_EINTR)) {
                CLR(bp->nb_flags, NB_EINTR);
        /* check for interruption of I/O, then errors. */
        if (ISSET(bp->nb_flags, NB_EINTR)) {
                CLR(bp->nb_flags, NB_EINTR);

-               return (EINTR);
-       } else if (ISSET(bp->nb_flags, NB_ERROR))
-               return (bp->nb_error ? bp->nb_error : EIO);
-       return (0);
+               return EINTR;
+       } else if (ISSET(bp->nb_flags, NB_ERROR)) {
+               return bp->nb_error ? bp->nb_error : EIO;
+       }
+       return 0;

 }
 
 /*
 }
 
 /*


@@ -1173,11 +1324,11 @@ nfs_buf_iowait(struct nfsbuf *bp)
 void
 nfs_buf_iodone(struct nfsbuf *bp)
 {
 void
 nfs_buf_iodone(struct nfsbuf *bp)
 {

-

        FSDBG_TOP(550, bp, NBOFF(bp), bp->nb_flags, bp->nb_error);
 
        FSDBG_TOP(550, bp, NBOFF(bp), bp->nb_flags, bp->nb_error);
 

-       if (ISSET(bp->nb_flags, NB_DONE))
+       if (ISSET(bp->nb_flags, NB_DONE)) {

                panic("nfs_buf_iodone already");
                panic("nfs_buf_iodone already");

+       }

 
        if (!ISSET(bp->nb_flags, NB_READ)) {
                CLR(bp->nb_flags, NB_WRITEINPROG);
 
        if (!ISSET(bp->nb_flags, NB_READ)) {
                CLR(bp->nb_flags, NB_WRITEINPROG);


@@ -1190,14 +1341,14 @@ nfs_buf_iodone(struct nfsbuf *bp)
                bp->nb_np->n_numoutput--;
                nfs_node_unlock(bp->nb_np);
        }
                bp->nb_np->n_numoutput--;
                nfs_node_unlock(bp->nb_np);
        }

-       if (ISSET(bp->nb_flags, NB_ASYNC)) {    /* if async, release it */
-               SET(bp->nb_flags, NB_DONE);             /* note that it's done */
+       if (ISSET(bp->nb_flags, NB_ASYNC)) {    /* if async, release it */
+               SET(bp->nb_flags, NB_DONE);             /* note that it's done */

                nfs_buf_release(bp, 1);
                nfs_buf_release(bp, 1);

-       } else {                                        /* or just wakeup the buffer */ 
-               lck_mtx_lock(nfs_buf_mutex);
-               SET(bp->nb_flags, NB_DONE);             /* note that it's done */
+       } else {                                        /* or just wakeup the buffer */
+               lck_mtx_lock(nfs_buf_mutex);
+               SET(bp->nb_flags, NB_DONE);             /* note that it's done */

                CLR(bp->nb_lflags, NBL_WANTED);
                CLR(bp->nb_lflags, NBL_WANTED);

-               lck_mtx_unlock(nfs_buf_mutex);
+               lck_mtx_unlock(nfs_buf_mutex);

                wakeup(bp);
        }
 
                wakeup(bp);
        }
 


@@ -1223,8 +1374,9 @@ nfs_buf_write_delayed(struct nfsbuf *bp)
                lck_mtx_lock(nfs_buf_mutex);
                nfs_nbdwrite++;
                NFSBUFCNTCHK();
                lck_mtx_lock(nfs_buf_mutex);
                nfs_nbdwrite++;
                NFSBUFCNTCHK();

-               if (bp->nb_vnbufs.le_next != NFSNOLIST)
+               if (bp->nb_vnbufs.le_next != NFSNOLIST) {

                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_REMOVE(bp, nb_vnbufs);

+               }

                LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                lck_mtx_unlock(nfs_buf_mutex);
        }
                LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                lck_mtx_unlock(nfs_buf_mutex);
        }


@@ -1244,8 +1396,9 @@ nfs_buf_write_delayed(struct nfsbuf *bp)
         * If we have too many delayed write buffers,
         * just fall back to doing the async write.
         */
         * If we have too many delayed write buffers,
         * just fall back to doing the async write.
         */

-       if (nfs_nbdwrite < 0)
+       if (nfs_nbdwrite < 0) {

                panic("nfs_buf_write_delayed: Negative nfs_nbdwrite");
                panic("nfs_buf_write_delayed: Negative nfs_nbdwrite");

+       }

        if (nfs_nbdwrite > NFS_A_LOT_OF_DELAYED_WRITES) {
                /* issue async write */
                SET(bp->nb_flags, NB_ASYNC);
        if (nfs_nbdwrite > NFS_A_LOT_OF_DELAYED_WRITES) {
                /* issue async write */
                SET(bp->nb_flags, NB_ASYNC);


@@ -1271,14 +1424,17 @@ nfs_buf_check_write_verifier(nfsnode_t np, struct nfsbuf *bp)
 {
        struct nfsmount *nmp;
 
 {
        struct nfsmount *nmp;
 

-       if (!ISSET(bp->nb_flags, NB_NEEDCOMMIT))
+       if (!ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {

                return;
                return;

+       }

 
        nmp = NFSTONMP(np);
 
        nmp = NFSTONMP(np);

-       if (!nmp)
+       if (nfs_mount_gone(nmp)) {

                return;
                return;

-       if (!ISSET(bp->nb_flags, NB_STALEWVERF) && (bp->nb_verf == nmp->nm_verf))
+       }
+       if (!ISSET(bp->nb_flags, NB_STALEWVERF) && (bp->nb_verf == nmp->nm_verf)) {

                return;
                return;

+       }

 
        /* write verifier changed, clear commit/wverf flags */
        CLR(bp->nb_flags, (NB_NEEDCOMMIT | NB_STALEWVERF));
 
        /* write verifier changed, clear commit/wverf flags */
        CLR(bp->nb_flags, (NB_NEEDCOMMIT | NB_STALEWVERF));


@@ -1296,7 +1452,7 @@ nfs_buf_check_write_verifier(nfsnode_t np, struct nfsbuf *bp)
 void
 nfs_buf_refget(struct nfsbuf *bp)
 {
 void
 nfs_buf_refget(struct nfsbuf *bp)
 {

-       bp->nb_refs++;
+       os_ref_retain_locked(&bp->nb_refs);

 }
 /*
  * release a reference on a buffer
 }
 /*
  * release a reference on a buffer


@@ -1305,7 +1461,7 @@ nfs_buf_refget(struct nfsbuf *bp)
 void
 nfs_buf_refrele(struct nfsbuf *bp)
 {
 void
 nfs_buf_refrele(struct nfsbuf *bp)
 {

-       bp->nb_refs--;
+       (void) os_ref_release_locked(&bp->nb_refs);

 }
 
 /*
 }
 
 /*


@@ -1319,30 +1475,33 @@ nfs_buf_acquire(struct nfsbuf *bp, int flags, int slpflag, int slptimeo)
        struct timespec ts;
 
        if (ISSET(bp->nb_lflags, NBL_BUSY)) {
        struct timespec ts;
 
        if (ISSET(bp->nb_lflags, NBL_BUSY)) {

-               /*      
+               /*

                 * since the lck_mtx_lock may block, the buffer
                 * may become BUSY, so we need to recheck for
                 * a NOWAIT request
                 */
                 * since the lck_mtx_lock may block, the buffer
                 * may become BUSY, so we need to recheck for
                 * a NOWAIT request
                 */

-               if (flags & NBAC_NOWAIT)
-                       return (EBUSY);
-               SET(bp->nb_lflags, NBL_WANTED);
+               if (flags & NBAC_NOWAIT) {
+                       return EBUSY;
+               }
+               SET(bp->nb_lflags, NBL_WANTED);

 
 

-               ts.tv_sec = (slptimeo/100);
+               ts.tv_sec = (slptimeo / 100);

                /* the hz value is 100; which leads to 10ms */
                ts.tv_nsec = (slptimeo % 100) * 10  * NSEC_PER_USEC * 1000;
 
                error = msleep(bp, nfs_buf_mutex, slpflag | (PRIBIO + 1),
                /* the hz value is 100; which leads to 10ms */
                ts.tv_nsec = (slptimeo % 100) * 10  * NSEC_PER_USEC * 1000;
 
                error = msleep(bp, nfs_buf_mutex, slpflag | (PRIBIO + 1),

-                       "nfs_buf_acquire", &ts);
-               if (error)
-                       return (error);
-               return (EAGAIN);
+                   "nfs_buf_acquire", &ts);
+               if (error) {
+                       return error;
+               }
+               return EAGAIN;
+       }
+       if (flags & NBAC_REMOVE) {
+               nfs_buf_remfree(bp);

        }
        }

-       if (flags & NBAC_REMOVE)
-               nfs_buf_remfree(bp);

        SET(bp->nb_lflags, NBL_BUSY);
 
        SET(bp->nb_lflags, NBL_BUSY);
 

-       return (0);
+       return 0;

 }
 
 /*
 }
 
 /*


@@ -1354,17 +1513,19 @@ nfs_buf_drop(struct nfsbuf *bp)
 {
        int need_wakeup = 0;
 
 {
        int need_wakeup = 0;
 

-       if (!ISSET(bp->nb_lflags, NBL_BUSY))
+       if (!ISSET(bp->nb_lflags, NBL_BUSY)) {

                panic("nfs_buf_drop: buffer not busy!");
                panic("nfs_buf_drop: buffer not busy!");

+       }

        if (ISSET(bp->nb_lflags, NBL_WANTED)) {
        if (ISSET(bp->nb_lflags, NBL_WANTED)) {

-               /* delay the actual wakeup until after we clear NBL_BUSY */
+               /* delay the actual wakeup until after we clear NBL_BUSY */

                need_wakeup = 1;
        }
        /* Unlock the buffer. */
        CLR(bp->nb_lflags, (NBL_BUSY | NBL_WANTED));
 
                need_wakeup = 1;
        }
        /* Unlock the buffer. */
        CLR(bp->nb_lflags, (NBL_BUSY | NBL_WANTED));
 

-       if (need_wakeup)
-               wakeup(bp);
+       if (need_wakeup) {
+               wakeup(bp);
+       }

 }
 
 /*
 }
 
 /*


@@ -1377,31 +1538,32 @@ nfs_buf_iterprepare(nfsnode_t np, struct nfsbuflists *iterheadp, int flags)
 {
        struct nfsbuflists *listheadp;
 
 {
        struct nfsbuflists *listheadp;
 

-       if (flags & NBI_DIRTY)
+       if (flags & NBI_DIRTY) {

                listheadp = &np->n_dirtyblkhd;
                listheadp = &np->n_dirtyblkhd;

-       else
+       } else {

                listheadp = &np->n_cleanblkhd;
                listheadp = &np->n_cleanblkhd;

+       }

 
        if ((flags & NBI_NOWAIT) && (np->n_bufiterflags & NBI_ITER)) {
 
        if ((flags & NBI_NOWAIT) && (np->n_bufiterflags & NBI_ITER)) {

-               LIST_INIT(iterheadp);
-               return(EWOULDBLOCK);
+               LIST_INIT(iterheadp);
+               return EWOULDBLOCK;

        }
 
        }
 

-       while (np->n_bufiterflags & NBI_ITER)   {
-               np->n_bufiterflags |= NBI_ITERWANT;
+       while (np->n_bufiterflags & NBI_ITER) {
+               np->n_bufiterflags |= NBI_ITERWANT;

                msleep(&np->n_bufiterflags, nfs_buf_mutex, 0, "nfs_buf_iterprepare", NULL);
        }
        if (LIST_EMPTY(listheadp)) {
                msleep(&np->n_bufiterflags, nfs_buf_mutex, 0, "nfs_buf_iterprepare", NULL);
        }
        if (LIST_EMPTY(listheadp)) {

-               LIST_INIT(iterheadp);
-               return(EINVAL);
+               LIST_INIT(iterheadp);
+               return EINVAL;

        }
        np->n_bufiterflags |= NBI_ITER;
 
        iterheadp->lh_first = listheadp->lh_first;
        }
        np->n_bufiterflags |= NBI_ITER;
 
        iterheadp->lh_first = listheadp->lh_first;

-       listheadp->lh_first->nb_vnbufs.le_prev = &iterheadp->lh_first;  
+       listheadp->lh_first->nb_vnbufs.le_prev = &iterheadp->lh_first;

        LIST_INIT(listheadp);
 
        LIST_INIT(listheadp);
 

-       return(0);
+       return 0;

 }
 
 /*
 }
 
 /*


@@ -1415,10 +1577,11 @@ nfs_buf_itercomplete(nfsnode_t np, struct nfsbuflists *iterheadp, int flags)
        struct nfsbuflists * listheadp;
        struct nfsbuf *bp;
 
        struct nfsbuflists * listheadp;
        struct nfsbuf *bp;
 

-       if (flags & NBI_DIRTY)
+       if (flags & NBI_DIRTY) {

                listheadp = &np->n_dirtyblkhd;
                listheadp = &np->n_dirtyblkhd;

-       else
+       } else {

                listheadp = &np->n_cleanblkhd;
                listheadp = &np->n_cleanblkhd;

+       }

 
        while (!LIST_EMPTY(iterheadp)) {
                bp = LIST_FIRST(iterheadp);
 
        while (!LIST_EMPTY(iterheadp)) {
                bp = LIST_FIRST(iterheadp);


@@ -1447,19 +1610,22 @@ nfs_buf_read(struct nfsbuf *bp)
 
        np = bp->nb_np;
        cred = bp->nb_rcred;
 
        np = bp->nb_np;
        cred = bp->nb_rcred;

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_ref(cred);
                kauth_cred_ref(cred);

+       }

        thd = ISSET(bp->nb_flags, NB_ASYNC) ? NULL : current_thread();
 
        /* sanity checks */
        thd = ISSET(bp->nb_flags, NB_ASYNC) ? NULL : current_thread();
 
        /* sanity checks */

-       if (!ISSET(bp->nb_flags, NB_READ))
+       if (!ISSET(bp->nb_flags, NB_READ)) {

                panic("nfs_buf_read: !NB_READ");
                panic("nfs_buf_read: !NB_READ");

-       if (ISSET(bp->nb_flags, NB_DONE))
+       }
+       if (ISSET(bp->nb_flags, NB_DONE)) {

                CLR(bp->nb_flags, NB_DONE);
                CLR(bp->nb_flags, NB_DONE);

+       }

 
        NFS_BUF_MAP(bp);
 
 
        NFS_BUF_MAP(bp);
 

-       OSAddAtomic(1, &nfsstats.read_bios);
+       OSAddAtomic64(1, &nfsstats.read_bios);

 
        error = nfs_buf_read_rpc(bp, thd, cred);
        /*
 
        error = nfs_buf_read_rpc(bp, thd, cred);
        /*


@@ -1467,9 +1633,10 @@ nfs_buf_read(struct nfsbuf *bp)
         * read.  Otherwise, the read has already been finished.
         */
 
         * read.  Otherwise, the read has already been finished.
         */
 

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_unref(&cred);
                kauth_cred_unref(&cred);

-       return (error);
+       }
+       return error;

 }
 
 /*
 }
 
 /*


@@ -1485,7 +1652,7 @@ nfs_buf_read_finish(struct nfsbuf *bp)
                /* update valid range */
                bp->nb_validoff = 0;
                bp->nb_validend = bp->nb_endio;
                /* update valid range */
                bp->nb_validoff = 0;
                bp->nb_validend = bp->nb_endio;

-               if (bp->nb_endio < (int)bp->nb_bufsize) { 
+               if (bp->nb_endio < bp->nb_bufsize) {

                        /*
                         * The read may be short because we have unflushed writes
                         * that are extending the file size and the reads hit the
                        /*
                         * The read may be short because we have unflushed writes
                         * that are extending the file size and the reads hit the


@@ -1495,20 +1662,22 @@ nfs_buf_read_finish(struct nfsbuf *bp)
                         * in nfs_buf_read_rpc_finish().
                         */
                        off_t boff = NBOFF(bp);
                         * in nfs_buf_read_rpc_finish().
                         */
                        off_t boff = NBOFF(bp);

-                       if ((off_t)np->n_size >= (boff + bp->nb_bufsize))
+                       if ((off_t)np->n_size >= (boff + bp->nb_bufsize)) {

                                bp->nb_validend = bp->nb_bufsize;
                                bp->nb_validend = bp->nb_bufsize;

-                       else if ((off_t)np->n_size >= boff)
+                       } else if ((off_t)np->n_size >= boff) {

                                bp->nb_validend = np->n_size - boff;
                                bp->nb_validend = np->n_size - boff;

-                       else
+                       } else {

                                bp->nb_validend = 0;
                                bp->nb_validend = 0;

+                       }

                }
                if ((nmp = NFSTONMP(np)) && (nmp->nm_vers == NFS_VER2) &&
                }
                if ((nmp = NFSTONMP(np)) && (nmp->nm_vers == NFS_VER2) &&

-                   ((NBOFF(bp) + bp->nb_validend) > 0x100000000LL))
+                   ((NBOFF(bp) + bp->nb_validend) > 0x100000000LL)) {

                        bp->nb_validend = 0x100000000LL - NBOFF(bp);
                        bp->nb_validend = 0x100000000LL - NBOFF(bp);

-               bp->nb_valid = (1 << (round_page_32(bp->nb_validend) / PAGE_SIZE)) - 1;
+               }
+               nfs_buf_pgs_get_page_mask(&bp->nb_valid, round_page_64(bp->nb_validend) / PAGE_SIZE);

                if (bp->nb_validend & PAGE_MASK) {
                        /* zero-fill remainder of last page */
                if (bp->nb_validend & PAGE_MASK) {
                        /* zero-fill remainder of last page */

-                       bzero(bp->nb_data + bp->nb_validend, bp->nb_bufsize - bp->nb_validend);
+                       bzero(bp->nb_data + bp->nb_validend, PAGE_SIZE - (bp->nb_validend & PAGE_MASK));

                }
        }
        nfs_buf_iodone(bp);
                }
        }
        nfs_buf_iodone(bp);


@@ -1523,18 +1692,20 @@ nfs_buf_read_rpc(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
        struct nfsmount *nmp;
        nfsnode_t np = bp->nb_np;
        int error = 0, nfsvers, async;
        struct nfsmount *nmp;
        nfsnode_t np = bp->nb_np;
        int error = 0, nfsvers, async;

-       int offset, nrpcs;
-       uint32_t nmrsize, length, len;
+       int offset;
+       uint64_t length, nrpcs;
+       uint32_t nmrsize;
+       size_t len;

        off_t boff;
        struct nfsreq *req;
        struct nfsreq_cbinfo cb;
 
        nmp = NFSTONMP(np);
        off_t boff;
        struct nfsreq *req;
        struct nfsreq_cbinfo cb;
 
        nmp = NFSTONMP(np);

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                bp->nb_error = error = ENXIO;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);
                bp->nb_error = error = ENXIO;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);

-               return (error);
+               return error;

        }
        nfsvers = nmp->nm_vers;
        nmrsize = nmp->nm_rsize;
        }
        nfsvers = nmp->nm_vers;
        nmrsize = nmp->nm_rsize;


@@ -1548,10 +1719,11 @@ nfs_buf_read_rpc(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                        bp->nb_error = error = EFBIG;
                        SET(bp->nb_flags, NB_ERROR);
                        nfs_buf_iodone(bp);
                        bp->nb_error = error = EFBIG;
                        SET(bp->nb_flags, NB_ERROR);
                        nfs_buf_iodone(bp);

-                       return (error);
+                       return error;

                }
                }

-               if ((boff + length - 1) > 0xffffffffLL)
+               if ((boff + length - 1) > 0xffffffffLL) {

                        length = 0x100000000LL - boff;
                        length = 0x100000000LL - boff;

+               }

        }
 
        /* Note: Can only do async I/O if nfsiods are configured. */
        }
 
        /* Note: Can only do async I/O if nfsiods are configured. */


@@ -1572,19 +1744,24 @@ nfs_buf_read_rpc(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                        error = bp->nb_error;
                        break;
                }
                        error = bp->nb_error;
                        break;
                }

-               len = (length > nmrsize) ? nmrsize : length;
-               cb.rcb_args[0] = offset;
-               cb.rcb_args[1] = len;
-               if (nmp->nm_vers >= NFS_VER4)
-                       cb.rcb_args[2] = nmp->nm_stategenid;
+               len = (length > nmrsize) ? nmrsize : (uint32_t)length;
+               cb.rcb_args.offset = offset;
+               cb.rcb_args.length = len;
+#if CONFIG_NFS4
+               if (nmp->nm_vers >= NFS_VER4) {
+                       cb.rcb_args.stategenid = nmp->nm_stategenid;
+               }
+#endif

                req = NULL;
                error = nmp->nm_funcs->nf_read_rpc_async(np, boff + offset, len, thd, cred, &cb, &req);
                req = NULL;
                error = nmp->nm_funcs->nf_read_rpc_async(np, boff + offset, len, thd, cred, &cb, &req);

-               if (error)
+               if (error) {

                        break;
                        break;

+               }

                offset += len;
                length -= len;
                offset += len;
                length -= len;

-               if (async)
+               if (async) {

                        continue;
                        continue;

+               }

                nfs_buf_read_rpc_finish(req);
                if (ISSET(bp->nb_flags, NB_ERROR)) {
                        error = bp->nb_error;
                nfs_buf_read_rpc_finish(req);
                if (ISSET(bp->nb_flags, NB_ERROR)) {
                        error = bp->nb_error;


@@ -1609,9 +1786,10 @@ nfs_buf_read_rpc(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                                nfs_buf_iodone(bp);
                        } else {
                                /* wait for the last RPC to mark it done */
                                nfs_buf_iodone(bp);
                        } else {
                                /* wait for the last RPC to mark it done */

-                               while (bp->nb_rpcs > 0)
+                               while (bp->nb_rpcs > 0) {

                                        msleep(&bp->nb_rpcs, nfs_buf_mutex, 0,
                                        msleep(&bp->nb_rpcs, nfs_buf_mutex, 0,

-                                               "nfs_buf_read_rpc_cancel", NULL);
+                                           "nfs_buf_read_rpc_cancel", NULL);
+                               }

                                lck_mtx_unlock(nfs_buf_mutex);
                        }
                } else {
                                lck_mtx_unlock(nfs_buf_mutex);
                        }
                } else {


@@ -1619,7 +1797,7 @@ nfs_buf_read_rpc(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                }
        }
 
                }
        }
 

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -1629,29 +1807,34 @@ void
 nfs_buf_read_rpc_finish(struct nfsreq *req)
 {
        struct nfsmount *nmp;
 nfs_buf_read_rpc_finish(struct nfsreq *req)
 {
        struct nfsmount *nmp;

-       size_t rlen;
+       size_t rlen, length;

        struct nfsreq_cbinfo cb;
        struct nfsbuf *bp;
        struct nfsreq_cbinfo cb;
        struct nfsbuf *bp;

-       int error = 0, nfsvers, offset, length, eof = 0, multasyncrpc, finished;
+       int error = 0, nfsvers, eof = 0, multasyncrpc, finished;
+       off_t offset;

        void *wakeme = NULL;
        struct nfsreq *rreq = NULL;
        nfsnode_t np;
        thread_t thd;
        kauth_cred_t cred;
        uio_t auio;
        void *wakeme = NULL;
        struct nfsreq *rreq = NULL;
        nfsnode_t np;
        thread_t thd;
        kauth_cred_t cred;
        uio_t auio;

-       char uio_buf [ UIO_SIZEOF(1) ];
+       char uio_buf[UIO_SIZEOF(1)];

 
 finish:
        np = req->r_np;
        thd = req->r_thread;
        cred = req->r_cred;
 
 finish:
        np = req->r_np;
        thd = req->r_thread;
        cred = req->r_cred;

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_ref(cred);
                kauth_cred_ref(cred);

+       }

        cb = req->r_callback;
        bp = cb.rcb_bp;
        cb = req->r_callback;
        bp = cb.rcb_bp;

+       if (cb.rcb_func) { /* take an extra reference on the nfsreq in case we want to resend it later due to grace error */
+               nfs_request_ref(req, 0);
+       }

 
        nmp = NFSTONMP(np);
 
        nmp = NFSTONMP(np);

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = ENXIO;
        }
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = ENXIO;
        }


@@ -1662,44 +1845,82 @@ finish:
        }
 
        nfsvers = nmp->nm_vers;
        }
 
        nfsvers = nmp->nm_vers;

-       offset = cb.rcb_args[0];
-       rlen = length = cb.rcb_args[1];
+       offset = cb.rcb_args.offset;
+       rlen = length = cb.rcb_args.length;

 
        auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,
 
        auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,

-                                UIO_READ, &uio_buf, sizeof(uio_buf));
+           UIO_READ, &uio_buf, sizeof(uio_buf));

        uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);
 
        /* finish the RPC */
        error = nmp->nm_funcs->nf_read_rpc_async_finish(np, req, auio, &rlen, &eof);
        if ((error == EINPROGRESS) && cb.rcb_func) {
                /* async request restarted */
        uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);
 
        /* finish the RPC */
        error = nmp->nm_funcs->nf_read_rpc_async_finish(np, req, auio, &rlen, &eof);
        if ((error == EINPROGRESS) && cb.rcb_func) {
                /* async request restarted */

-               if (IS_VALID_CRED(cred))
+               if (cb.rcb_func) {
+                       nfs_request_rele(req);
+               }
+               if (IS_VALID_CRED(cred)) {

                        kauth_cred_unref(&cred);
                        kauth_cred_unref(&cred);

+               }

                return;
        }
                return;
        }

+#if CONFIG_NFS4

        if ((nmp->nm_vers >= NFS_VER4) && nfs_mount_state_error_should_restart(error) && !ISSET(bp->nb_flags, NB_ERROR)) {
                lck_mtx_lock(&nmp->nm_lock);
        if ((nmp->nm_vers >= NFS_VER4) && nfs_mount_state_error_should_restart(error) && !ISSET(bp->nb_flags, NB_ERROR)) {
                lck_mtx_lock(&nmp->nm_lock);

-               if ((error != NFSERR_GRACE) && (cb.rcb_args[2] == nmp->nm_stategenid) && !(nmp->nm_state & NFSSTA_RECOVER)) {
-                       printf("nfs_buf_read_rpc_finish: error %d, initiating recovery\n", error);
-                       nmp->nm_state |= NFSSTA_RECOVER;
-                       nfs_mount_sock_thread_wake(nmp);
+               if ((error != NFSERR_OLD_STATEID) && (error != NFSERR_GRACE) && (cb.rcb_args.stategenid == nmp->nm_stategenid)) {
+                       NP(np, "nfs_buf_read_rpc_finish: error %d @ 0x%llx, 0x%x 0x%x, initiating recovery",
+                           error, NBOFF(bp) + offset, cb.rcb_args.stategenid, nmp->nm_stategenid);
+                       nfs_need_recover(nmp, error);

                }
                lck_mtx_unlock(&nmp->nm_lock);
                }
                lck_mtx_unlock(&nmp->nm_lock);

-               if (error == NFSERR_GRACE)
-                       tsleep(&nmp->nm_state, (PZERO-1), "nfsgrace", 2*hz);
-               if (!(error = nfs_mount_state_wait_for_recovery(nmp))) {
-                       rlen = 0;
-                       goto readagain;
+               if (np->n_flag & NREVOKE) {
+                       error = EIO;
+               } else {
+                       if (error == NFSERR_GRACE) {
+                               if (cb.rcb_func) {
+                                       /*
+                                        * For an async I/O request, handle a grace delay just like
+                                        * jukebox errors.  Set the resend time and queue it up.
+                                        */
+                                       struct timeval now;
+                                       if (req->r_nmrep.nmc_mhead) {
+                                               mbuf_freem(req->r_nmrep.nmc_mhead);
+                                               req->r_nmrep.nmc_mhead = NULL;
+                                       }
+                                       req->r_error = 0;
+                                       microuptime(&now);
+                                       lck_mtx_lock(&req->r_mtx);
+                                       req->r_resendtime = now.tv_sec + 2;
+                                       req->r_xid = 0;                 // get a new XID
+                                       req->r_flags |= R_RESTART;
+                                       req->r_start = 0;
+                                       nfs_asyncio_resend(req);
+                                       lck_mtx_unlock(&req->r_mtx);
+                                       if (IS_VALID_CRED(cred)) {
+                                               kauth_cred_unref(&cred);
+                                       }
+                                       /* Note: nfsreq reference taken will be dropped later when finished */
+                                       return;
+                               }
+                               /* otherwise, just pause a couple seconds and retry */
+                               tsleep(&nmp->nm_state, (PZERO - 1), "nfsgrace", 2 * hz);
+                       }
+                       if (!(error = nfs_mount_state_wait_for_recovery(nmp))) {
+                               rlen = 0;
+                               goto readagain;
+                       }

                }
        }
                }
        }

+#endif

        if (error) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
                goto out;
        }
 
        if (error) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
                goto out;
        }
 

-       if ((rlen > 0) && (bp->nb_endio < (offset + (int)rlen)))
+       if ((rlen > 0) && (bp->nb_endio < (offset + (int)rlen))) {

                bp->nb_endio = offset + rlen;
                bp->nb_endio = offset + rlen;

+       }

 
        if ((nfsvers == NFS_VER2) || eof || (rlen == 0)) {
                /* zero out the remaining data (up to EOF) */
 
        if ((nfsvers == NFS_VER2) || eof || (rlen == 0)) {
                /* zero out the remaining data (up to EOF) */


@@ -1707,9 +1928,10 @@ finish:
                rpcrem = (length - rlen);
                eofrem = np->n_size - (NBOFF(bp) + offset + rlen);
                rem = (rpcrem < eofrem) ? rpcrem : eofrem;
                rpcrem = (length - rlen);
                eofrem = np->n_size - (NBOFF(bp) + offset + rlen);
                rem = (rpcrem < eofrem) ? rpcrem : eofrem;

-               if (rem > 0)
-                       bzero(bp->nb_data + offset + rlen, rem);
-       } else if (((int)rlen < length) && !ISSET(bp->nb_flags, NB_ERROR)) {
+               if (rem > 0) {
+                       NFS_BZERO(bp->nb_data + offset + rlen, rem);
+               }
+       } else if ((rlen < length) && !ISSET(bp->nb_flags, NB_ERROR)) {

                /*
                 * short read
                 *
                /*
                 * short read
                 *


@@ -1717,23 +1939,30 @@ finish:
                 * requested, so we need to issue another read for the rest.
                 * (Don't bother if the buffer already hit an error.)
                 */
                 * requested, so we need to issue another read for the rest.
                 * (Don't bother if the buffer already hit an error.)
                 */

+#if CONFIG_NFS4

 readagain:
 readagain:

+#endif

                offset += rlen;
                length -= rlen;
                offset += rlen;
                length -= rlen;

-               cb.rcb_args[0] = offset;
-               cb.rcb_args[1] = length;
-               if (nmp->nm_vers >= NFS_VER4)
-                       cb.rcb_args[2] = nmp->nm_stategenid;
+               cb.rcb_args.offset = offset;
+               cb.rcb_args.length = length;
+#if CONFIG_NFS4
+               if (nmp->nm_vers >= NFS_VER4) {
+                       cb.rcb_args.stategenid = nmp->nm_stategenid;
+               }
+#endif

                error = nmp->nm_funcs->nf_read_rpc_async(np, NBOFF(bp) + offset, length, thd, cred, &cb, &rreq);
                if (!error) {
                error = nmp->nm_funcs->nf_read_rpc_async(np, NBOFF(bp) + offset, length, thd, cred, &cb, &rreq);
                if (!error) {

-                       if (IS_VALID_CRED(cred))
+                       if (IS_VALID_CRED(cred)) {

                                kauth_cred_unref(&cred);
                                kauth_cred_unref(&cred);

+                       }

                        if (!cb.rcb_func) {
                                /* if !async we'll need to wait for this RPC to finish */
                                req = rreq;
                                rreq = NULL;
                                goto finish;
                        }
                        if (!cb.rcb_func) {
                                /* if !async we'll need to wait for this RPC to finish */
                                req = rreq;
                                rreq = NULL;
                                goto finish;
                        }

+                       nfs_request_rele(req);

                        /*
                         * We're done here.
                         * Outstanding RPC count is unchanged.
                        /*
                         * We're done here.
                         * Outstanding RPC count is unchanged.


@@ -1746,8 +1975,12 @@ readagain:
        }
 
 out:
        }
 
 out:

-       if (IS_VALID_CRED(cred))
+       if (cb.rcb_func) {
+               nfs_request_rele(req);
+       }
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_unref(&cred);
                kauth_cred_unref(&cred);

+       }

 
        /*
         * Decrement outstanding RPC count on buffer
 
        /*
         * Decrement outstanding RPC count on buffer


@@ -1759,21 +1992,25 @@ out:
         */
 
        multasyncrpc = ISSET(bp->nb_flags, NB_MULTASYNCRPC);
         */
 
        multasyncrpc = ISSET(bp->nb_flags, NB_MULTASYNCRPC);

-       if (multasyncrpc)
+       if (multasyncrpc) {

                lck_mtx_lock(nfs_buf_mutex);
                lck_mtx_lock(nfs_buf_mutex);

+       }

 
        bp->nb_rpcs--;
        finished = (bp->nb_rpcs == 0);
 
 
        bp->nb_rpcs--;
        finished = (bp->nb_rpcs == 0);
 

-       if (multasyncrpc)
+       if (multasyncrpc) {

                lck_mtx_unlock(nfs_buf_mutex);
                lck_mtx_unlock(nfs_buf_mutex);

+       }

 
        if (finished) {
 
        if (finished) {

-               if (multasyncrpc)
+               if (multasyncrpc) {

                        wakeme = &bp->nb_rpcs;
                        wakeme = &bp->nb_rpcs;

+               }

                nfs_buf_read_finish(bp);
                nfs_buf_read_finish(bp);

-               if (wakeme)
+               if (wakeme) {

                        wakeup(wakeme);
                        wakeup(wakeme);

+               }

        }
 }
 
        }
 }
 


@@ -1786,14 +2023,18 @@ nfs_buf_readahead(nfsnode_t np, int ioflag, daddr64_t *rabnp, daddr64_t lastrabn
 {
        struct nfsmount *nmp = NFSTONMP(np);
        struct nfsbuf *bp;
 {
        struct nfsmount *nmp = NFSTONMP(np);
        struct nfsbuf *bp;

-       int error = 0, nra;
+       int error = 0;
+       uint32_t nra;

 
 

-       if (!nmp)
-               return (ENXIO);
-       if (nmp->nm_readahead <= 0)
-               return (0);
-       if (*rabnp > lastrabn)
-               return (0);
+       if (nfs_mount_gone(nmp)) {
+               return ENXIO;
+       }
+       if (nmp->nm_readahead <= 0) {
+               return 0;
+       }
+       if (*rabnp > lastrabn) {
+               return 0;
+       }

 
        for (nra = 0; (nra < nmp->nm_readahead) && (*rabnp <= lastrabn); nra++, *rabnp = *rabnp + 1) {
                /* check if block exists and is valid. */
 
        for (nra = 0; (nra < nmp->nm_readahead) && (*rabnp <= lastrabn); nra++, *rabnp = *rabnp + 1) {
                /* check if block exists and is valid. */


@@ -1802,36 +2043,40 @@ nfs_buf_readahead(nfsnode_t np, int ioflag, daddr64_t *rabnp, daddr64_t lastrabn
                        *rabnp = lastrabn;
                        break;
                }
                        *rabnp = lastrabn;
                        break;
                }

-               error = nfs_buf_get(np, *rabnp, nmp->nm_biosize, thd, NBLK_READ|NBLK_NOWAIT, &bp);
-               if (error)
+               error = nfs_buf_get(np, *rabnp, nmp->nm_biosize, thd, NBLK_READ | NBLK_NOWAIT, &bp);
+               if (error) {

                        break;
                        break;

+               }

                nfs_node_lock_force(np);
                np->n_lastrahead = *rabnp;
                nfs_node_unlock(np);
                nfs_node_lock_force(np);
                np->n_lastrahead = *rabnp;
                nfs_node_unlock(np);

-               if (!bp)
+               if (!bp) {

                        continue;
                        continue;

+               }

                if ((ioflag & IO_NOCACHE) && ISSET(bp->nb_flags, NB_CACHE) &&
                if ((ioflag & IO_NOCACHE) && ISSET(bp->nb_flags, NB_CACHE) &&

-                   !bp->nb_dirty && !ISSET(bp->nb_flags, (NB_DELWRI|NB_NCRDAHEAD))) {
+                   !nfs_buf_pgs_is_set(&bp->nb_dirty) && !ISSET(bp->nb_flags, (NB_DELWRI | NB_NCRDAHEAD))) {

                        CLR(bp->nb_flags, NB_CACHE);
                        CLR(bp->nb_flags, NB_CACHE);

-                       bp->nb_valid = 0;
+                       NBPGS_ERASE(&bp->nb_valid);

                        bp->nb_validoff = bp->nb_validend = -1;
                }
                        bp->nb_validoff = bp->nb_validend = -1;
                }

-               if ((bp->nb_dirtyend <= 0) && !bp->nb_dirty &&
-                   !ISSET(bp->nb_flags, (NB_CACHE|NB_DELWRI))) {
-                       SET(bp->nb_flags, (NB_READ|NB_ASYNC));
-                       if (ioflag & IO_NOCACHE)
+               if ((bp->nb_dirtyend <= 0) && !nfs_buf_pgs_is_set(&bp->nb_dirty) &&
+                   !ISSET(bp->nb_flags, (NB_CACHE | NB_DELWRI))) {
+                       SET(bp->nb_flags, (NB_READ | NB_ASYNC));
+                       if (ioflag & IO_NOCACHE) {

                                SET(bp->nb_flags, NB_NCRDAHEAD);
                                SET(bp->nb_flags, NB_NCRDAHEAD);

+                       }

                        if (!IS_VALID_CRED(bp->nb_rcred) && IS_VALID_CRED(cred)) {
                                kauth_cred_ref(cred);
                                bp->nb_rcred = cred;
                        }
                        if (!IS_VALID_CRED(bp->nb_rcred) && IS_VALID_CRED(cred)) {
                                kauth_cred_ref(cred);
                                bp->nb_rcred = cred;
                        }

-                       if ((error = nfs_buf_read(bp)))
+                       if ((error = nfs_buf_read(bp))) {

                                break;
                                break;

+                       }

                        continue;
                }
                nfs_buf_release(bp, 1);
        }
                        continue;
                }
                nfs_buf_release(bp, 1);
        }

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -1842,11 +2087,10 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
 {
        vnode_t vp = NFSTOV(np);
        struct nfsbuf *bp = NULL;
 {
        vnode_t vp = NFSTOV(np);
        struct nfsbuf *bp = NULL;

-       struct nfs_vattr nvattr;

        struct nfsmount *nmp = VTONMP(vp);
        daddr64_t lbn, rabn = 0, lastrabn, maxrabn = -1;
        struct nfsmount *nmp = VTONMP(vp);
        daddr64_t lbn, rabn = 0, lastrabn, maxrabn = -1;

-       off_t diff;
-       int error = 0, n = 0, on = 0;
+       off_t diff, on = 0, n = 0;
+       int error = 0, n32;

        int nfsvers, biosize, modified, readaheads = 0;
        thread_t thd;
        kauth_cred_t cred;
        int nfsvers, biosize, modified, readaheads = 0;
        thread_t thd;
        kauth_cred_t cred;


@@ -1862,14 +2106,14 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
        if (vnode_vtype(vp) != VREG) {
                printf("nfs_bioread: type %x unexpected\n", vnode_vtype(vp));
                FSDBG_BOT(514, np, 0xd1e0016, 0, EINVAL);
        if (vnode_vtype(vp) != VREG) {
                printf("nfs_bioread: type %x unexpected\n", vnode_vtype(vp));
                FSDBG_BOT(514, np, 0xd1e0016, 0, EINVAL);

-               return (EINVAL);
+               return EINVAL;

        }
 
        /*
         * For NFS, cache consistency can only be maintained approximately.
         * Although RFC1094 does not specify the criteria, the following is
         * believed to be compatible with the reference port.
        }
 
        /*
         * For NFS, cache consistency can only be maintained approximately.
         * Although RFC1094 does not specify the criteria, the following is
         * believed to be compatible with the reference port.

-        * 
+        *

         * If the file has changed since the last read RPC or you have
         * written to the file, you may have lost data cache consistency
         * with the server.  So, check for a change, and flush all of the
         * If the file has changed since the last read RPC or you have
         * written to the file, you may have lost data cache consistency
         * with the server.  So, check for a change, and flush all of the


@@ -1880,42 +2124,44 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
         * new attributes (via NATTRINVALIDATE() or NGA_UNCACHED).
         */
 
         * new attributes (via NATTRINVALIDATE() or NGA_UNCACHED).
         */
 

-       if (ISSET(np->n_flag, NUPDATESIZE))
+       if (ISSET(np->n_flag, NUPDATESIZE)) {

                nfs_data_update_size(np, 0);
                nfs_data_update_size(np, 0);

+       }

 
        if ((error = nfs_node_lock(np))) {
                FSDBG_BOT(514, np, 0xd1e0222, 0, error);
 
        if ((error = nfs_node_lock(np))) {
                FSDBG_BOT(514, np, 0xd1e0222, 0, error);

-               return (error);
+               return error;

        }
 
        if (np->n_flag & NNEEDINVALIDATE) {
                np->n_flag &= ~NNEEDINVALIDATE;
                nfs_node_unlock(np);
        }
 
        if (np->n_flag & NNEEDINVALIDATE) {
                np->n_flag &= ~NNEEDINVALIDATE;
                nfs_node_unlock(np);

-               error = nfs_vinvalbuf(vp, V_SAVE|V_IGNORE_WRITEERR, ctx, 1);
-               if (!error)
+               error = nfs_vinvalbuf(vp, V_SAVE | V_IGNORE_WRITEERR, ctx, 1);
+               if (!error) {

                        error = nfs_node_lock(np);
                        error = nfs_node_lock(np);

+               }

                if (error) {
                        FSDBG_BOT(514, np, 0xd1e0322, 0, error);
                if (error) {
                        FSDBG_BOT(514, np, 0xd1e0322, 0, error);

-                       return (error);
+                       return error;

                }
        }
 
        modified = (np->n_flag & NMODIFIED);
        nfs_node_unlock(np);
        /* nfs_getattr() will check changed and purge caches */
                }
        }
 
        modified = (np->n_flag & NMODIFIED);
        nfs_node_unlock(np);
        /* nfs_getattr() will check changed and purge caches */

-       error = nfs_getattr(np, &nvattr, ctx, modified ? NGA_UNCACHED : NGA_CACHED);
+       error = nfs_getattr(np, NULL, ctx, modified ? NGA_UNCACHED : NGA_CACHED);

        if (error) {
                FSDBG_BOT(514, np, 0xd1e0004, 0, error);
        if (error) {
                FSDBG_BOT(514, np, 0xd1e0004, 0, error);

-               return (error);
+               return error;

        }
 
        if (uio_resid(uio) == 0) {
                FSDBG_BOT(514, np, 0xd1e0001, 0, 0);
        }
 
        if (uio_resid(uio) == 0) {
                FSDBG_BOT(514, np, 0xd1e0001, 0, 0);

-               return (0);
+               return 0;

        }
        if (uio_offset(uio) < 0) {
                FSDBG_BOT(514, np, 0xd1e0002, 0, EINVAL);
        }
        if (uio_offset(uio) < 0) {
                FSDBG_BOT(514, np, 0xd1e0002, 0, EINVAL);

-               return (EINVAL);
+               return EINVAL;

        }
 
        /*
        }
 
        /*


@@ -1926,28 +2172,31 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
         */
        if (nmp->nm_readahead > 0) {
                off_t end = uio_offset(uio) + uio_resid(uio);
         */
        if (nmp->nm_readahead > 0) {
                off_t end = uio_offset(uio) + uio_resid(uio);

-               if (end > (off_t)np->n_size)
+               if (end > (off_t)np->n_size) {

                        end = np->n_size;
                        end = np->n_size;

+               }

                rabn = uio_offset(uio) / biosize;
                maxrabn = (end - 1) / biosize;
                nfs_node_lock_force(np);
                if (!(ioflag & IO_NOCACHE) &&
                rabn = uio_offset(uio) / biosize;
                maxrabn = (end - 1) / biosize;
                nfs_node_lock_force(np);
                if (!(ioflag & IO_NOCACHE) &&

-                   (!rabn || (rabn == np->n_lastread) || (rabn == (np->n_lastread+1)))) {
+                   (!rabn || (rabn == np->n_lastread) || (rabn == (np->n_lastread + 1)))) {

                        maxrabn += nmp->nm_readahead;
                        maxrabn += nmp->nm_readahead;

-                       if ((maxrabn * biosize) >= (off_t)np->n_size)
-                               maxrabn = ((off_t)np->n_size - 1)/biosize;
+                       if ((maxrabn * biosize) >= (off_t)np->n_size) {
+                               maxrabn = ((off_t)np->n_size - 1) / biosize;
+                       }

                }
                }

-               if (maxrabn < np->n_lastrahead)
+               if (maxrabn < np->n_lastrahead) {

                        np->n_lastrahead = -1;
                        np->n_lastrahead = -1;

-               if (rabn < np->n_lastrahead)
+               }
+               if (rabn < np->n_lastrahead) {

                        rabn = np->n_lastrahead + 1;
                        rabn = np->n_lastrahead + 1;

+               }

                nfs_node_unlock(np);
        } else {
                rabn = maxrabn = 0;
        }
 
        do {
                nfs_node_unlock(np);
        } else {
                rabn = maxrabn = 0;
        }
 
        do {

-

                nfs_data_lock(np, NFS_DATA_LOCK_SHARED);
                lbn = uio_offset(uio) / biosize;
 
                nfs_data_lock(np, NFS_DATA_LOCK_SHARED);
                lbn = uio_offset(uio) / biosize;
 


@@ -1958,24 +2207,25 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
                 */
                if ((!(ioflag & IO_NOCACHE) || !readaheads) &&
                    ((uio->uio_segflg == UIO_USERSPACE32 ||
                 */
                if ((!(ioflag & IO_NOCACHE) || !readaheads) &&
                    ((uio->uio_segflg == UIO_USERSPACE32 ||

-                     uio->uio_segflg == UIO_USERSPACE64 ||
-                     uio->uio_segflg == UIO_USERSPACE))) {
+                   uio->uio_segflg == UIO_USERSPACE64 ||
+                   uio->uio_segflg == UIO_USERSPACE))) {

                        io_resid = uio_resid(uio);
                        diff = np->n_size - uio_offset(uio);
                        io_resid = uio_resid(uio);
                        diff = np->n_size - uio_offset(uio);

-                       if (diff < io_resid)
+                       if (diff < io_resid) {

                                io_resid = diff;
                                io_resid = diff;

+                       }

                        if (io_resid > 0) {
                        if (io_resid > 0) {

-                               int count = (io_resid > INT_MAX) ? INT_MAX : io_resid;
+                               int count = (io_resid > INT_MAX) ? INT_MAX : (int)io_resid;

                                error = cluster_copy_ubc_data(vp, uio, &count, 0);
                                if (error) {
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, uio_offset(uio), 0xcacefeed, error);
                                error = cluster_copy_ubc_data(vp, uio, &count, 0);
                                if (error) {
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, uio_offset(uio), 0xcacefeed, error);

-                                       return (error);
+                                       return error;

                                }
                        }
                        /* count any biocache reads that we just copied directly */
                                }
                        }
                        /* count any biocache reads that we just copied directly */

-                       if (lbn != (uio_offset(uio)/biosize)) {
-                               OSAddAtomic((uio_offset(uio)/biosize) - lbn, &nfsstats.biocache_reads);
+                       if (lbn != (uio_offset(uio) / biosize)) {
+                               OSAddAtomic64(NFS_ROUND_BLOCK(uio_offset(uio), biosize) - lbn, &nfsstats.biocache_reads);

                                FSDBG(514, np, 0xcacefeed, uio_offset(uio), error);
                        }
                }
                                FSDBG(514, np, 0xcacefeed, uio_offset(uio), error);
                        }
                }


@@ -1986,28 +2236,30 @@ nfs_bioread(nfsnode_t np, uio_t uio, int ioflag, vfs_context_t ctx)
                np->n_lastread = (uio_offset(uio) - 1) / biosize;
                nfs_node_unlock(np);
 
                np->n_lastread = (uio_offset(uio) - 1) / biosize;
                nfs_node_unlock(np);
 

+               if ((uio_resid(uio) <= 0) || (uio_offset(uio) >= (off_t)np->n_size)) {
+                       nfs_data_unlock(np);
+                       FSDBG_BOT(514, np, uio_offset(uio), uio_resid(uio), 0xaaaaaaaa);
+                       return 0;
+               }
+

                /* adjust readahead block number, if necessary */
                /* adjust readahead block number, if necessary */

-               if (rabn < lbn)
+               if (rabn < lbn) {

                        rabn = lbn;
                        rabn = lbn;

+               }

                lastrabn = MIN(maxrabn, lbn + nmp->nm_readahead);
                if (rabn <= lastrabn) { /* start readaheads */
                        error = nfs_buf_readahead(np, ioflag, &rabn, lastrabn, thd, cred);
                        if (error) {
                                nfs_data_unlock(np);
                                FSDBG_BOT(514, np, 0xd1e000b, 1, error);
                lastrabn = MIN(maxrabn, lbn + nmp->nm_readahead);
                if (rabn <= lastrabn) { /* start readaheads */
                        error = nfs_buf_readahead(np, ioflag, &rabn, lastrabn, thd, cred);
                        if (error) {
                                nfs_data_unlock(np);
                                FSDBG_BOT(514, np, 0xd1e000b, 1, error);

-                               return (error);
+                               return error;

                        }
                        readaheads = 1;
                        }
                        readaheads = 1;

+                       OSAddAtomic64(rabn - lbn, &nfsstats.biocache_reads);
+               } else {
+                       OSAddAtomic64(1, &nfsstats.biocache_reads);

                }
 
                }
 

-               if ((uio_resid(uio) <= 0) || (uio_offset(uio) >= (off_t)np->n_size)) {
-                       nfs_data_unlock(np);
-                       FSDBG_BOT(514, np, uio_offset(uio), uio_resid(uio), 0xaaaaaaaa);
-                       return (0);
-               }
-
-               OSAddAtomic(1, &nfsstats.biocache_reads);
-

                /*
                 * If the block is in the cache and has the required data
                 * in a valid region, just copy it out.
                /*
                 * If the block is in the cache and has the required data
                 * in a valid region, just copy it out.


@@ -2018,14 +2270,15 @@ again:
                io_resid = uio_resid(uio);
                n = (io_resid > (biosize - on)) ? (biosize - on) : io_resid;
                diff = np->n_size - uio_offset(uio);
                io_resid = uio_resid(uio);
                n = (io_resid > (biosize - on)) ? (biosize - on) : io_resid;
                diff = np->n_size - uio_offset(uio);

-               if (diff < n)
+               if (diff < n) {

                        n = diff;
                        n = diff;

+               }

 
                error = nfs_buf_get(np, lbn, biosize, thd, NBLK_READ, &bp);
                if (error) {
                        nfs_data_unlock(np);
                        FSDBG_BOT(514, np, 0xd1e000c, 0, error);
 
                error = nfs_buf_get(np, lbn, biosize, thd, NBLK_READ, &bp);
                if (error) {
                        nfs_data_unlock(np);
                        FSDBG_BOT(514, np, 0xd1e000c, 0, error);

-                       return (error);
+                       return error;

                }
 
                if ((ioflag & IO_NOCACHE) && ISSET(bp->nb_flags, NB_CACHE)) {
                }
 
                if ((ioflag & IO_NOCACHE) && ISSET(bp->nb_flags, NB_CACHE)) {


@@ -2035,7 +2288,7 @@ again:
                         * Invalidate the data if it wasn't just read
                         * in as part of a "nocache readahead".
                         */
                         * Invalidate the data if it wasn't just read
                         * in as part of a "nocache readahead".
                         */

-                       if (bp->nb_dirty || (bp->nb_dirtyend > 0)) {
+                       if (nfs_buf_pgs_is_set(&bp->nb_dirty) || (bp->nb_dirtyend > 0)) {

                                /* so write the buffer out and try again */
                                SET(bp->nb_flags, NB_NOCACHE);
                                goto flushbuffer;
                                /* so write the buffer out and try again */
                                SET(bp->nb_flags, NB_NOCACHE);
                                goto flushbuffer;


@@ -2047,18 +2300,20 @@ again:
                }
 
                /* if any pages are valid... */
                }
 
                /* if any pages are valid... */

-               if (bp->nb_valid) {
+               if (nfs_buf_pgs_is_set(&bp->nb_valid)) {

                        /* ...check for any invalid pages in the read range */
                        /* ...check for any invalid pages in the read range */

-                       int pg, firstpg, lastpg, dirtypg;
+                       off_t pg, firstpg, lastpg, dirtypg;

                        dirtypg = firstpg = lastpg = -1;
                        dirtypg = firstpg = lastpg = -1;

-                       pg = on/PAGE_SIZE;
-                       while (pg <= (on + n - 1)/PAGE_SIZE) {
-                               if (!NBPGVALID(bp,pg)) {
-                                       if (firstpg < 0)
+                       pg = on / PAGE_SIZE;
+                       while (pg <= (on + n - 1) / PAGE_SIZE) {
+                               if (!NBPGVALID(bp, pg)) {
+                                       if (firstpg < 0) {

                                                firstpg = pg;
                                                firstpg = pg;

+                                       }

                                        lastpg = pg;
                                        lastpg = pg;

-                               } else if (firstpg >= 0 && dirtypg < 0 && NBPGDIRTY(bp,pg))
+                               } else if (firstpg >= 0 && dirtypg < 0 && NBPGDIRTY(bp, pg)) {

                                        dirtypg = pg;
                                        dirtypg = pg;

+                               }

                                pg++;
                        }
 
                                pg++;
                        }
 


@@ -2067,8 +2322,8 @@ again:
                                if (bp->nb_validoff < 0) {
                                        /* valid range isn't set up, so */
                                        /* set it to what we know is valid */
                                if (bp->nb_validoff < 0) {
                                        /* valid range isn't set up, so */
                                        /* set it to what we know is valid */

-                                       bp->nb_validoff = trunc_page(on);
-                                       bp->nb_validend = round_page(on+n);
+                                       bp->nb_validoff = trunc_page_64(on);
+                                       bp->nb_validend = round_page_64(on + n);

                                        nfs_buf_normalize_valid_range(np, bp);
                                }
                                goto buffer_ready;
                                        nfs_buf_normalize_valid_range(np, bp);
                                }
                                goto buffer_ready;


@@ -2076,7 +2331,7 @@ again:
 
                        /* there are invalid pages in the read range */
                        if (((dirtypg > firstpg) && (dirtypg < lastpg)) ||
 
                        /* there are invalid pages in the read range */
                        if (((dirtypg > firstpg) && (dirtypg < lastpg)) ||

-                           (((firstpg*PAGE_SIZE) < bp->nb_dirtyend) && (((lastpg+1)*PAGE_SIZE) > bp->nb_dirtyoff))) {
+                           (((firstpg * PAGE_SIZE) < bp->nb_dirtyend) && (((lastpg + 1) * PAGE_SIZE) > bp->nb_dirtyoff))) {

                                /* there are also dirty page(s) (or range) in the read range, */
                                /* so write the buffer out and try again */
 flushbuffer:
                                /* there are also dirty page(s) (or range) in the read range, */
                                /* so write the buffer out and try again */
 flushbuffer:


@@ -2090,41 +2345,42 @@ flushbuffer:
                                if (error) {
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, 0xd1e000d, 0, error);
                                if (error) {
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, 0xd1e000d, 0, error);

-                                       return (error);
+                                       return error;

                                }
                                goto again;
                        }
                                }
                                goto again;
                        }

-                       if (!bp->nb_dirty && bp->nb_dirtyend <= 0 &&
-                           (lastpg - firstpg + 1) > (biosize/PAGE_SIZE)/2) {
+                       if (!nfs_buf_pgs_is_set(&bp->nb_dirty) && bp->nb_dirtyend <= 0 &&
+                           (lastpg - firstpg + 1) > (biosize / PAGE_SIZE) / 2) {

                                /* we need to read in more than half the buffer and the */
                                /* buffer's not dirty, so just fetch the whole buffer */
                                /* we need to read in more than half the buffer and the */
                                /* buffer's not dirty, so just fetch the whole buffer */

-                               bp->nb_valid = 0;
+                               NBPGS_ERASE(&bp->nb_valid);

                        } else {
                                /* read the page range in */
                                uio_t auio;
                        } else {
                                /* read the page range in */
                                uio_t auio;

-                               char uio_buf[ UIO_SIZEOF(1) ];
-                               
+                               char uio_buf[UIO_SIZEOF(1)];
+

                                NFS_BUF_MAP(bp);
                                auio = uio_createwithbuffer(1, (NBOFF(bp) + firstpg * PAGE_SIZE_64),
                                NFS_BUF_MAP(bp);
                                auio = uio_createwithbuffer(1, (NBOFF(bp) + firstpg * PAGE_SIZE_64),

-                                               UIO_SYSSPACE, UIO_READ, &uio_buf[0], sizeof(uio_buf));
+                                   UIO_SYSSPACE, UIO_READ, &uio_buf[0], sizeof(uio_buf));

                                if (!auio) {
                                        error = ENOMEM;
                                } else {
                                if (!auio) {
                                        error = ENOMEM;
                                } else {

-                                       uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + (firstpg * PAGE_SIZE)),
-                                                       ((lastpg - firstpg + 1) * PAGE_SIZE));
+                                       NFS_UIO_ADDIOV(auio, CAST_USER_ADDR_T(bp->nb_data + (firstpg * PAGE_SIZE)),
+                                           ((lastpg - firstpg + 1) * PAGE_SIZE));

                                        error = nfs_read_rpc(np, auio, ctx);
                                }
                                if (error) {
                                        error = nfs_read_rpc(np, auio, ctx);
                                }
                                if (error) {

-                                       if (ioflag & IO_NOCACHE)
+                                       if (ioflag & IO_NOCACHE) {

                                                SET(bp->nb_flags, NB_NOCACHE);
                                                SET(bp->nb_flags, NB_NOCACHE);

+                                       }

                                        nfs_buf_release(bp, 1);
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, 0xd1e000e, 0, error);
                                        nfs_buf_release(bp, 1);
                                        nfs_data_unlock(np);
                                        FSDBG_BOT(514, np, 0xd1e000e, 0, error);

-                                       return (error);
+                                       return error;

                                }
                                /* Make sure that the valid range is set to cover this read. */
                                }
                                /* Make sure that the valid range is set to cover this read. */

-                               bp->nb_validoff = trunc_page_32(on);
-                               bp->nb_validend = round_page_32(on+n);
+                               bp->nb_validoff = trunc_page_64(on);
+                               bp->nb_validend = round_page_64(on + n);

                                nfs_buf_normalize_valid_range(np, bp);
                                if (uio_resid(auio) > 0) {
                                        /* if short read, must have hit EOF, */
                                nfs_buf_normalize_valid_range(np, bp);
                                if (uio_resid(auio) > 0) {
                                        /* if short read, must have hit EOF, */


@@ -2132,12 +2388,13 @@ flushbuffer:
                                        bzero(CAST_DOWN(caddr_t, uio_curriovbase(auio)), uio_resid(auio));
                                }
                                /* mark the pages (successfully read) as valid */
                                        bzero(CAST_DOWN(caddr_t, uio_curriovbase(auio)), uio_resid(auio));
                                }
                                /* mark the pages (successfully read) as valid */

-                               for (pg=firstpg; pg <= lastpg; pg++)
-                                       NBPGVALID_SET(bp,pg);
+                               for (pg = firstpg; pg <= lastpg; pg++) {
+                                       NBPGVALID_SET(bp, pg);
+                               }

                        }
                }
                /* if no pages are valid, read the whole block */
                        }
                }
                /* if no pages are valid, read the whole block */

-               if (!bp->nb_valid) {
+               if (!nfs_buf_pgs_is_set(&bp->nb_valid)) {

                        if (!IS_VALID_CRED(bp->nb_rcred) && IS_VALID_CRED(cred)) {
                                kauth_cred_ref(cred);
                                bp->nb_rcred = cred;
                        if (!IS_VALID_CRED(bp->nb_rcred) && IS_VALID_CRED(cred)) {
                                kauth_cred_ref(cred);
                                bp->nb_rcred = cred;


@@ -2145,27 +2402,34 @@ flushbuffer:
                        SET(bp->nb_flags, NB_READ);
                        CLR(bp->nb_flags, (NB_DONE | NB_ERROR | NB_INVAL));
                        error = nfs_buf_read(bp);
                        SET(bp->nb_flags, NB_READ);
                        CLR(bp->nb_flags, (NB_DONE | NB_ERROR | NB_INVAL));
                        error = nfs_buf_read(bp);

-                       if (ioflag & IO_NOCACHE)
+                       if (ioflag & IO_NOCACHE) {

                                SET(bp->nb_flags, NB_NOCACHE);
                                SET(bp->nb_flags, NB_NOCACHE);

+                       }

                        if (error) {
                                nfs_data_unlock(np);
                                nfs_buf_release(bp, 1);
                                FSDBG_BOT(514, np, 0xd1e000f, 0, error);
                        if (error) {
                                nfs_data_unlock(np);
                                nfs_buf_release(bp, 1);
                                FSDBG_BOT(514, np, 0xd1e000f, 0, error);

-                               return (error);
+                               return error;

                        }
                }
 buffer_ready:
                /* validate read range against valid range and clip */
                if (bp->nb_validend > 0) {
                        diff = (on >= bp->nb_validend) ? 0 : (bp->nb_validend - on);
                        }
                }
 buffer_ready:
                /* validate read range against valid range and clip */
                if (bp->nb_validend > 0) {
                        diff = (on >= bp->nb_validend) ? 0 : (bp->nb_validend - on);

-                       if (diff < n)
+                       if (diff < n) {

                                n = diff;
                                n = diff;

+                       }

                }
                if (n > 0) {
                        NFS_BUF_MAP(bp);
                }
                if (n > 0) {
                        NFS_BUF_MAP(bp);

-                       error = uiomove(bp->nb_data + on, n, uio);
+                       n32 = n > INT_MAX ? INT_MAX : (int)n;
+                       error = uiomove(bp->nb_data + on, n32, uio);
+                       if (!error && n > n32) {
+                               error = uiomove(bp->nb_data + on + n32, (int)(n - n32), uio);
+                       }

                }
 
                }
 

+

                nfs_buf_release(bp, 1);
                nfs_data_unlock(np);
                nfs_node_lock_force(np);
                nfs_buf_release(bp, 1);
                nfs_data_unlock(np);
                nfs_node_lock_force(np);


@@ -2173,7 +2437,7 @@ buffer_ready:
                nfs_node_unlock(np);
        } while (error == 0 && uio_resid(uio) > 0 && n > 0);
        FSDBG_BOT(514, np, uio_offset(uio), uio_resid(uio), error);
                nfs_node_unlock(np);
        } while (error == 0 && uio_resid(uio) > 0 && n > 0);
        FSDBG_BOT(514, np, uio_offset(uio), uio_resid(uio), error);

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -2182,31 +2446,36 @@ buffer_ready:
 int
 nfs_async_write_start(struct nfsmount *nmp)
 {
 int
 nfs_async_write_start(struct nfsmount *nmp)
 {

-       int error = 0, slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0;
-       struct timespec ts = {1, 0};
+       int error = 0, slpflag = NMFLAG(nmp, INTR) ? PCATCH : 0;
+       struct timespec ts = { .tv_sec = 1, .tv_nsec = 0 };

 
 

-       if (nfs_max_async_writes <= 0)
-               return (0);
+       if (nfs_max_async_writes <= 0) {
+               return 0;
+       }

        lck_mtx_lock(&nmp->nm_lock);
        while ((nfs_max_async_writes > 0) && (nmp->nm_asyncwrites >= nfs_max_async_writes)) {
        lck_mtx_lock(&nmp->nm_lock);
        while ((nfs_max_async_writes > 0) && (nmp->nm_asyncwrites >= nfs_max_async_writes)) {

-               if ((error = nfs_sigintr(nmp, NULL, current_thread(), 1)))
+               if ((error = nfs_sigintr(nmp, NULL, current_thread(), 1))) {

                        break;
                        break;

-               msleep(&nmp->nm_asyncwrites, &nmp->nm_lock, slpflag|(PZERO-1), "nfsasyncwrites", &ts);
+               }
+               msleep(&nmp->nm_asyncwrites, &nmp->nm_lock, slpflag | (PZERO - 1), "nfsasyncwrites", &ts);

                slpflag = 0;
        }
                slpflag = 0;
        }

-       if (!error)
+       if (!error) {

                nmp->nm_asyncwrites++;
                nmp->nm_asyncwrites++;

+       }

        lck_mtx_unlock(&nmp->nm_lock);
        lck_mtx_unlock(&nmp->nm_lock);

-       return (error);
+       return error;

 }
 void
 nfs_async_write_done(struct nfsmount *nmp)
 {
 }
 void
 nfs_async_write_done(struct nfsmount *nmp)
 {

-       if (nmp->nm_asyncwrites <= 0)
+       if (nmp->nm_asyncwrites <= 0) {

                return;
                return;

+       }

        lck_mtx_lock(&nmp->nm_lock);
        lck_mtx_lock(&nmp->nm_lock);

-       if (nmp->nm_asyncwrites-- >= nfs_max_async_writes)
+       if (nmp->nm_asyncwrites-- >= nfs_max_async_writes) {

                wakeup(&nmp->nm_asyncwrites);
                wakeup(&nmp->nm_asyncwrites);

+       }

        lck_mtx_unlock(&nmp->nm_lock);
 }
 
        lck_mtx_unlock(&nmp->nm_lock);
 }
 


@@ -2229,19 +2498,20 @@ nfs_buf_write(struct nfsbuf *bp)
        thread_t thd;
        kauth_cred_t cred;
        proc_t p = current_proc();
        thread_t thd;
        kauth_cred_t cred;
        proc_t p = current_proc();

-       int iomode, doff, dend, firstpg, lastpg;
-       uint32_t pagemask;
+       int iomode;
+       off_t doff, dend, firstpg, lastpg;

 
        FSDBG_TOP(553, bp, NBOFF(bp), bp->nb_flags, 0);
 
 
        FSDBG_TOP(553, bp, NBOFF(bp), bp->nb_flags, 0);
 

-       if (!ISSET(bp->nb_lflags, NBL_BUSY))
+       if (!ISSET(bp->nb_lflags, NBL_BUSY)) {

                panic("nfs_buf_write: buffer is not busy???");
                panic("nfs_buf_write: buffer is not busy???");

+       }

 
        np = bp->nb_np;
        async = ISSET(bp->nb_flags, NB_ASYNC);
        oldflags = bp->nb_flags;
 
 
        np = bp->nb_np;
        async = ISSET(bp->nb_flags, NB_ASYNC);
        oldflags = bp->nb_flags;
 

-       CLR(bp->nb_flags, (NB_READ|NB_DONE|NB_ERROR|NB_DELWRI));
+       CLR(bp->nb_flags, (NB_READ | NB_DONE | NB_ERROR | NB_DELWRI));

        if (ISSET(oldflags, NB_DELWRI)) {
                lck_mtx_lock(nfs_buf_mutex);
                nfs_nbdwrite--;
        if (ISSET(oldflags, NB_DELWRI)) {
                lck_mtx_lock(nfs_buf_mutex);
                nfs_nbdwrite--;


@@ -2251,10 +2521,11 @@ nfs_buf_write(struct nfsbuf *bp)
        }
 
        /* move to clean list */
        }
 
        /* move to clean list */

-       if (ISSET(oldflags, (NB_ASYNC|NB_DELWRI))) {
+       if (ISSET(oldflags, (NB_ASYNC | NB_DELWRI))) {

                lck_mtx_lock(nfs_buf_mutex);
                lck_mtx_lock(nfs_buf_mutex);

-               if (bp->nb_vnbufs.le_next != NFSNOLIST)
+               if (bp->nb_vnbufs.le_next != NFSNOLIST) {

                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_REMOVE(bp, nb_vnbufs);

+               }

                LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
                lck_mtx_unlock(nfs_buf_mutex);
        }
                LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
                lck_mtx_unlock(nfs_buf_mutex);
        }


@@ -2263,37 +2534,50 @@ nfs_buf_write(struct nfsbuf *bp)
        nfs_node_unlock(np);
        vnode_startwrite(NFSTOV(np));
 
        nfs_node_unlock(np);
        vnode_startwrite(NFSTOV(np));
 

-       if (p && p->p_stats)
+       if (p && p->p_stats) {

                OSIncrementAtomicLong(&p->p_stats->p_ru.ru_oublock);
                OSIncrementAtomicLong(&p->p_stats->p_ru.ru_oublock);

+       }

 
        cred = bp->nb_wcred;
 
        cred = bp->nb_wcred;

-       if (!IS_VALID_CRED(cred) && ISSET(bp->nb_flags, NB_READ))
+       if (!IS_VALID_CRED(cred) && ISSET(bp->nb_flags, NB_READ)) {

                cred = bp->nb_rcred;  /* shouldn't really happen, but... */
                cred = bp->nb_rcred;  /* shouldn't really happen, but... */

-       if (IS_VALID_CRED(cred))
+       }
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_ref(cred);
                kauth_cred_ref(cred);

+       }

        thd = async ? NULL : current_thread();
 
        /* We need to make sure the pages are locked before doing I/O.  */
        thd = async ? NULL : current_thread();
 
        /* We need to make sure the pages are locked before doing I/O.  */

-       if (!ISSET(bp->nb_flags, NB_META) && UBCINFOEXISTS(NFSTOV(np))) {
-               if (!ISSET(bp->nb_flags, NB_PAGELIST)) {
-                       error = nfs_buf_upl_setup(bp);
-                       if (error) {
-                               printf("nfs_buf_write: upl create failed %d\n", error);
-                               SET(bp->nb_flags, NB_ERROR);
-                               bp->nb_error = error = EIO;
-                               nfs_buf_iodone(bp);
-                               goto out;
+       if (!ISSET(bp->nb_flags, NB_META)) {
+               if (UBCINFOEXISTS(NFSTOV(np))) {
+                       if (!ISSET(bp->nb_flags, NB_PAGELIST)) {
+                               error = nfs_buf_upl_setup(bp);
+                               if (error) {
+                                       printf("nfs_buf_write: upl create failed %d\n", error);
+                                       SET(bp->nb_flags, NB_ERROR);
+                                       bp->nb_error = error = EIO;
+                                       nfs_buf_iodone(bp);
+                                       goto out;
+                               }
+                               nfs_buf_upl_check(bp);

                        }
                        }

-                       nfs_buf_upl_check(bp);
+               } else {
+                       /* We should never be in nfs_buf_write() with no UBCINFO. */
+                       printf("nfs_buf_write: ubcinfo already gone\n");
+                       SET(bp->nb_flags, NB_ERROR);
+                       bp->nb_error = error = EIO;
+                       nfs_buf_iodone(bp);
+                       goto out;

                }
        }
 
        /* If NB_NEEDCOMMIT is set, a commit RPC may do the trick. */
                }
        }
 
        /* If NB_NEEDCOMMIT is set, a commit RPC may do the trick. */

-       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT))
+       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {

                nfs_buf_check_write_verifier(np, bp);
                nfs_buf_check_write_verifier(np, bp);

+       }

        if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {
                struct nfsmount *nmp = NFSTONMP(np);
        if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {
                struct nfsmount *nmp = NFSTONMP(np);

-               if (!nmp) {
+               if (nfs_mount_gone(nmp)) {

                        SET(bp->nb_flags, NB_ERROR);
                        bp->nb_error = error = EIO;
                        nfs_buf_iodone(bp);
                        SET(bp->nb_flags, NB_ERROR);
                        bp->nb_error = error = EIO;
                        nfs_buf_iodone(bp);


@@ -2301,7 +2585,7 @@ nfs_buf_write(struct nfsbuf *bp)
                }
                SET(bp->nb_flags, NB_WRITEINPROG);
                error = nmp->nm_funcs->nf_commit_rpc(np, NBOFF(bp) + bp->nb_dirtyoff,
                }
                SET(bp->nb_flags, NB_WRITEINPROG);
                error = nmp->nm_funcs->nf_commit_rpc(np, NBOFF(bp) + bp->nb_dirtyoff,

-                               bp->nb_dirtyend - bp->nb_dirtyoff, bp->nb_wcred);
+                   bp->nb_dirtyend - bp->nb_dirtyoff, bp->nb_wcred, bp->nb_verf);

                CLR(bp->nb_flags, NB_WRITEINPROG);
                if (error) {
                        if (error != NFSERR_STALEWRITEVERF) {
                CLR(bp->nb_flags, NB_WRITEINPROG);
                if (error) {
                        if (error != NFSERR_STALEWRITEVERF) {


@@ -2322,57 +2606,73 @@ nfs_buf_write(struct nfsbuf *bp)
                /* sanity check the dirty range */
                if (NBOFF(bp) + bp->nb_dirtyend > (off_t) np->n_size) {
                        bp->nb_dirtyend = np->n_size - NBOFF(bp);
                /* sanity check the dirty range */
                if (NBOFF(bp) + bp->nb_dirtyend > (off_t) np->n_size) {
                        bp->nb_dirtyend = np->n_size - NBOFF(bp);

-                       if (bp->nb_dirtyoff >= bp->nb_dirtyend)
+                       if (bp->nb_dirtyoff >= bp->nb_dirtyend) {

                                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
                                bp->nb_dirtyoff = bp->nb_dirtyend = 0;

+                       }

                }
        }
        if (!error && (bp->nb_dirtyend > 0)) {
                /* there's a dirty range that needs to be written out */
                }
        }
        if (!error && (bp->nb_dirtyend > 0)) {
                /* there's a dirty range that needs to be written out */

+               nfsbufpgs pagemask, pagemaskand;

                NFS_BUF_MAP(bp);
 
                doff = bp->nb_dirtyoff;
                dend = bp->nb_dirtyend;
 
                /* if doff page is dirty, move doff to start of page */
                NFS_BUF_MAP(bp);
 
                doff = bp->nb_dirtyoff;
                dend = bp->nb_dirtyend;
 
                /* if doff page is dirty, move doff to start of page */

-               if (NBPGDIRTY(bp, doff / PAGE_SIZE))
+               if (NBPGDIRTY(bp, doff / PAGE_SIZE)) {

                        doff -= doff & PAGE_MASK;
                        doff -= doff & PAGE_MASK;

+               }

                /* try to expand write range to include preceding dirty pages */
                /* try to expand write range to include preceding dirty pages */

-               if (!(doff & PAGE_MASK))
-                       while ((doff > 0) && NBPGDIRTY(bp, (doff - 1) / PAGE_SIZE))
+               if (!(doff & PAGE_MASK)) {
+                       while ((doff > 0) && NBPGDIRTY(bp, (doff - 1) / PAGE_SIZE)) {

                                doff -= PAGE_SIZE;
                                doff -= PAGE_SIZE;

+                       }
+               }

                /* if dend page is dirty, move dend to start of next page */
                /* if dend page is dirty, move dend to start of next page */

-               if ((dend & PAGE_MASK) && NBPGDIRTY(bp, dend / PAGE_SIZE))
-                       dend = round_page_32(dend);
+               if ((dend & PAGE_MASK) && NBPGDIRTY(bp, dend / PAGE_SIZE)) {
+                       dend = round_page_64(dend);
+               }

                /* try to expand write range to include trailing dirty pages */
                /* try to expand write range to include trailing dirty pages */

-               if (!(dend & PAGE_MASK))
-                       while ((dend < (int)bp->nb_bufsize) && NBPGDIRTY(bp, dend / PAGE_SIZE))
+               if (!(dend & PAGE_MASK)) {
+                       while ((dend < (int)bp->nb_bufsize) && NBPGDIRTY(bp, dend / PAGE_SIZE)) {

                                dend += PAGE_SIZE;
                                dend += PAGE_SIZE;

+                       }
+               }

                /* make sure to keep dend clipped to EOF */
                /* make sure to keep dend clipped to EOF */

-               if ((NBOFF(bp) + dend) > (off_t) np->n_size)
+               if ((NBOFF(bp) + dend) > (off_t) np->n_size) {

                        dend = np->n_size - NBOFF(bp);
                        dend = np->n_size - NBOFF(bp);

+               }

                /* calculate range of complete pages being written */
                /* calculate range of complete pages being written */

-               firstpg = round_page_32(doff) / PAGE_SIZE;
-               lastpg = (trunc_page_32(dend) - 1) / PAGE_SIZE;
-               /* calculate mask for that page range */
-               pagemask = ((1 << (lastpg + 1)) - 1) & ~((1 << firstpg) - 1);
+               if (dend > doff) {
+                       firstpg = doff / PAGE_SIZE;
+                       lastpg = (dend - 1) / PAGE_SIZE;
+                       /* calculate mask for that page range */
+                       nfs_buf_pgs_set_pages_between(&pagemask, firstpg, lastpg + 1);
+               } else {
+                       NBPGS_ERASE(&pagemask);
+               }

 
                /*
                 * compare page mask to nb_dirty; if there are other dirty pages
                 * then write FILESYNC; otherwise, write UNSTABLE if async and
                 * not needcommit/stable; otherwise write FILESYNC
                 */
 
                /*
                 * compare page mask to nb_dirty; if there are other dirty pages
                 * then write FILESYNC; otherwise, write UNSTABLE if async and
                 * not needcommit/stable; otherwise write FILESYNC
                 */

-               if (bp->nb_dirty & ~pagemask)
+               nfs_buf_pgs_bit_not(&pagemask);
+               nfs_buf_pgs_bit_and(&bp->nb_dirty, &pagemask, &pagemaskand);
+               if (nfs_buf_pgs_is_set(&pagemaskand)) {

                        iomode = NFS_WRITE_FILESYNC;
                        iomode = NFS_WRITE_FILESYNC;

-               else if ((bp->nb_flags & (NB_ASYNC | NB_NEEDCOMMIT | NB_STABLE)) == NB_ASYNC)
+               } else if ((bp->nb_flags & (NB_ASYNC | NB_NEEDCOMMIT | NB_STABLE)) == NB_ASYNC) {

                        iomode = NFS_WRITE_UNSTABLE;
                        iomode = NFS_WRITE_UNSTABLE;

-               else
+               } else {

                        iomode = NFS_WRITE_FILESYNC;
                        iomode = NFS_WRITE_FILESYNC;

+               }

 
                /* write the whole contiguous dirty range */
                bp->nb_offio = doff;
                bp->nb_endio = dend;
 
 
                /* write the whole contiguous dirty range */
                bp->nb_offio = doff;
                bp->nb_endio = dend;
 

-               OSAddAtomic(1, &nfsstats.write_bios);
+               OSAddAtomic64(1, &nfsstats.write_bios);

 
                SET(bp->nb_flags, NB_WRITEINPROG);
                error = nfs_buf_write_rpc(bp, iomode, thd, cred);
 
                SET(bp->nb_flags, NB_WRITEINPROG);
                error = nfs_buf_write_rpc(bp, iomode, thd, cred);


@@ -2383,8 +2683,9 @@ nfs_buf_write(struct nfsbuf *bp)
                 * pages pushed out.
                 */
        } else {
                 * pages pushed out.
                 */
        } else {

-               if (!error && bp->nb_dirty) /* write out any dirty pages */
+               if (!error && nfs_buf_pgs_is_set(&bp->nb_dirty)) { /* write out any dirty pages */

                        error = nfs_buf_write_dirty_pages(bp, thd, cred);
                        error = nfs_buf_write_dirty_pages(bp, thd, cred);

+               }

                nfs_buf_iodone(bp);
        }
        /* note: bp is still valid only for !async case */
                nfs_buf_iodone(bp);
        }
        /* note: bp is still valid only for !async case */


@@ -2394,8 +2695,9 @@ out:
                /* move to clean list */
                if (oldflags & NB_DELWRI) {
                        lck_mtx_lock(nfs_buf_mutex);
                /* move to clean list */
                if (oldflags & NB_DELWRI) {
                        lck_mtx_lock(nfs_buf_mutex);

-                       if (bp->nb_vnbufs.le_next != NFSNOLIST)
+                       if (bp->nb_vnbufs.le_next != NFSNOLIST) {

                                LIST_REMOVE(bp, nb_vnbufs);
                                LIST_REMOVE(bp, nb_vnbufs);

+                       }

                        LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
                        lck_mtx_unlock(nfs_buf_mutex);
                }
                        LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
                        lck_mtx_unlock(nfs_buf_mutex);
                }


@@ -2403,7 +2705,7 @@ out:
                nfs_buf_release(bp, 1);
                /* check if we need to invalidate (and we can) */
                if ((np->n_flag & NNEEDINVALIDATE) &&
                nfs_buf_release(bp, 1);
                /* check if we need to invalidate (and we can) */
                if ((np->n_flag & NNEEDINVALIDATE) &&

-                   !(np->n_bflag & (NBINVALINPROG|NBFLUSHINPROG))) {
+                   !(np->n_bflag & (NBINVALINPROG | NBFLUSHINPROG))) {

                        int invalidate = 0;
                        nfs_node_lock_force(np);
                        if (np->n_flag & NNEEDINVALIDATE) {
                        int invalidate = 0;
                        nfs_node_lock_force(np);
                        if (np->n_flag & NNEEDINVALIDATE) {


@@ -2423,14 +2725,15 @@ out:
                                 * the buffer busy.  So we call vinvalbuf() after
                                 * releasing the buffer.
                                 */
                                 * the buffer busy.  So we call vinvalbuf() after
                                 * releasing the buffer.
                                 */

-                               nfs_vinvalbuf2(NFSTOV(np), V_SAVE|V_IGNORE_WRITEERR, thd, cred, 1);
+                               nfs_vinvalbuf2(NFSTOV(np), V_SAVE | V_IGNORE_WRITEERR, thd, cred, 1);

                        }
                }
        }
 
                        }
                }
        }
 

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_unref(&cred);
                kauth_cred_unref(&cred);

-       return (error);
+       }
+       return error;

 }
 
 /*
 }
 
 /*


@@ -2441,8 +2744,7 @@ nfs_buf_write_finish(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
 {
        nfsnode_t np = bp->nb_np;
        int error = (bp->nb_flags & NB_ERROR) ? bp->nb_error : 0;
 {
        nfsnode_t np = bp->nb_np;
        int error = (bp->nb_flags & NB_ERROR) ? bp->nb_error : 0;

-       int firstpg, lastpg;
-       uint32_t pagemask;
+       off_t firstpg, lastpg;

 
        if ((error == EINTR) || (error == ERESTART)) {
                CLR(bp->nb_flags, NB_ERROR);
 
        if ((error == EINTR) || (error == ERESTART)) {
                CLR(bp->nb_flags, NB_ERROR);


@@ -2450,13 +2752,19 @@ nfs_buf_write_finish(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
        }
 
        if (!error) {
        }
 
        if (!error) {

+               nfsbufpgs pagemask;

                /* calculate range of complete pages being written */
                /* calculate range of complete pages being written */

-               firstpg = round_page_32(bp->nb_offio) / PAGE_SIZE;
-               lastpg = (trunc_page_32(bp->nb_endio) - 1) / PAGE_SIZE;
-               /* calculate mask for that page range written */
-               pagemask = ((1 << (lastpg + 1)) - 1) & ~((1 << firstpg) - 1);
+               if (bp->nb_endio > bp->nb_offio) {
+                       firstpg = bp->nb_offio / PAGE_SIZE;
+                       lastpg = (bp->nb_endio - 1) / PAGE_SIZE;
+                       /* calculate mask for that page range written */
+                       nfs_buf_pgs_set_pages_between(&pagemask, firstpg, lastpg + 1);
+               } else {
+                       NBPGS_ERASE(&pagemask);
+               }

                /* clear dirty bits for pages we've written */
                /* clear dirty bits for pages we've written */

-               bp->nb_dirty &= ~pagemask;
+               nfs_buf_pgs_bit_not(&pagemask);
+               nfs_buf_pgs_bit_and(&bp->nb_dirty, &pagemask, &bp->nb_dirty);

        }
 
        /* manage needcommit state */
        }
 
        /* manage needcommit state */


@@ -2505,8 +2813,9 @@ nfs_buf_write_finish(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                if (ISSET(bp->nb_flags, NB_ASYNC)) {
                        /* move to dirty list */
                        lck_mtx_lock(nfs_buf_mutex);
                if (ISSET(bp->nb_flags, NB_ASYNC)) {
                        /* move to dirty list */
                        lck_mtx_lock(nfs_buf_mutex);

-                       if (bp->nb_vnbufs.le_next != NFSNOLIST)
+                       if (bp->nb_vnbufs.le_next != NFSNOLIST) {

                                LIST_REMOVE(bp, nb_vnbufs);
                                LIST_REMOVE(bp, nb_vnbufs);

+                       }

                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        lck_mtx_unlock(nfs_buf_mutex);
                }
                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        lck_mtx_unlock(nfs_buf_mutex);
                }


@@ -2533,8 +2842,9 @@ nfs_buf_write_finish(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
        }
 
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
        }
 

-       if (!error && bp->nb_dirty)
+       if (!error && nfs_buf_pgs_is_set(&bp->nb_dirty)) {

                nfs_buf_write_dirty_pages(bp, thd, cred);
                nfs_buf_write_dirty_pages(bp, thd, cred);

+       }

        nfs_buf_iodone(bp);
 }
 
        nfs_buf_iodone(bp);
 }
 


@@ -2551,49 +2861,55 @@ nfs_buf_write_dirty_pages(struct nfsbuf *bp, thread_t thd, kauth_cred_t cred)
        nfsnode_t np = bp->nb_np;
        struct nfsmount *nmp = NFSTONMP(np);
        int error = 0, commit, iomode, iomode2, len, pg, count, npages, off;
        nfsnode_t np = bp->nb_np;
        struct nfsmount *nmp = NFSTONMP(np);
        int error = 0, commit, iomode, iomode2, len, pg, count, npages, off;

-       uint32_t dirty = bp->nb_dirty;
+       nfsbufpgs dirty;

        uint64_t wverf;
        uio_t auio;
        uint64_t wverf;
        uio_t auio;

-       char uio_buf [ UIO_SIZEOF(1) ];
+       char uio_buf[UIO_SIZEOF(1)];

 
 

-       if (!bp->nb_dirty)
-               return (0);
+       if (!nfs_buf_pgs_is_set(&bp->nb_dirty)) {
+               return 0;
+       }

 
        /* there are pages marked dirty that need to be written out */
 
        /* there are pages marked dirty that need to be written out */

-       OSAddAtomic(1, &nfsstats.write_bios);
+       OSAddAtomic64(1, &nfsstats.write_bios);

        NFS_BUF_MAP(bp);
        SET(bp->nb_flags, NB_WRITEINPROG);
        npages = bp->nb_bufsize / PAGE_SIZE;
        iomode = NFS_WRITE_UNSTABLE;
 
        auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_WRITE,
        NFS_BUF_MAP(bp);
        SET(bp->nb_flags, NB_WRITEINPROG);
        npages = bp->nb_bufsize / PAGE_SIZE;
        iomode = NFS_WRITE_UNSTABLE;
 
        auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_WRITE,

-               &uio_buf, sizeof(uio_buf));
+           &uio_buf, sizeof(uio_buf));

 
 again:
 
 again:

-       dirty = bp->nb_dirty;
+       NBPGS_COPY(&dirty, &bp->nb_dirty);

        wverf = bp->nb_verf;
        commit = NFS_WRITE_FILESYNC;
        for (pg = 0; pg < npages; pg++) {
        wverf = bp->nb_verf;
        commit = NFS_WRITE_FILESYNC;
        for (pg = 0; pg < npages; pg++) {

-               if (!NBPGDIRTY(bp, pg))
+               if (!NBPGDIRTY(bp, pg)) {

                        continue;
                        continue;

+               }

                count = 1;
                count = 1;

-               while (((pg + count) < npages) && NBPGDIRTY(bp, pg + count))
+               while (((pg + count) < npages) && NBPGDIRTY(bp, pg + count)) {

                        count++;
                        count++;

+               }

                /* write count pages starting with page pg */
                off = pg * PAGE_SIZE;
                len = count * PAGE_SIZE;
                /* clip writes to EOF */
                /* write count pages starting with page pg */
                off = pg * PAGE_SIZE;
                len = count * PAGE_SIZE;
                /* clip writes to EOF */

-               if (NBOFF(bp) + off + len > (off_t) np->n_size)
+               if (NBOFF(bp) + off + len > (off_t) np->n_size) {

                        len -= (NBOFF(bp) + off + len) - np->n_size;
                        len -= (NBOFF(bp) + off + len) - np->n_size;

+               }

                if (len > 0) {
                        iomode2 = iomode;
                        uio_reset(auio, NBOFF(bp) + off, UIO_SYSSPACE, UIO_WRITE);
                        uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + off), len);
                        error = nfs_write_rpc2(np, auio, thd, cred, &iomode2, &bp->nb_verf);
                if (len > 0) {
                        iomode2 = iomode;
                        uio_reset(auio, NBOFF(bp) + off, UIO_SYSSPACE, UIO_WRITE);
                        uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + off), len);
                        error = nfs_write_rpc2(np, auio, thd, cred, &iomode2, &bp->nb_verf);

-                       if (error)
+                       if (error) {

                                break;
                                break;

-                       if (iomode2 < commit) /* Retain the lowest commitment level returned. */
+                       }
+                       if (iomode2 < commit) { /* Retain the lowest commitment level returned. */

                                commit = iomode2;
                                commit = iomode2;

+                       }

                        if ((commit != NFS_WRITE_FILESYNC) && (wverf != bp->nb_verf)) {
                                /* verifier changed, redo all the writes filesync */
                                iomode = NFS_WRITE_FILESYNC;
                        if ((commit != NFS_WRITE_FILESYNC) && (wverf != bp->nb_verf)) {
                                /* verifier changed, redo all the writes filesync */
                                iomode = NFS_WRITE_FILESYNC;


@@ -2602,15 +2918,16 @@ again:
                }
                /* clear dirty bits */
                while (count--) {
                }
                /* clear dirty bits */
                while (count--) {

-                       dirty &= ~(1 << pg);
-                       if (count) /* leave pg on last page */
+                       NBPGS_UNSET(&dirty, pg);
+                       if (count) { /* leave pg on last page */

                                pg++;
                                pg++;

+                       }

                }
        }
        CLR(bp->nb_flags, NB_WRITEINPROG);
 
        if (!error && (commit != NFS_WRITE_FILESYNC)) {
                }
        }
        CLR(bp->nb_flags, NB_WRITEINPROG);
 
        if (!error && (commit != NFS_WRITE_FILESYNC)) {

-               error = nmp->nm_funcs->nf_commit_rpc(np, NBOFF(bp), bp->nb_bufsize, cred);
+               error = nmp->nm_funcs->nf_commit_rpc(np, NBOFF(bp), bp->nb_bufsize, cred, wverf);

                if (error == NFSERR_STALEWRITEVERF) {
                        /* verifier changed, so we need to restart all the writes */
                        iomode = NFS_WRITE_FILESYNC;
                if (error == NFSERR_STALEWRITEVERF) {
                        /* verifier changed, so we need to restart all the writes */
                        iomode = NFS_WRITE_FILESYNC;


@@ -2618,12 +2935,12 @@ again:
                }
        }
        if (!error) {
                }
        }
        if (!error) {

-               bp->nb_dirty = dirty;
+               NBPGS_COPY(&bp->nb_dirty, &dirty);

        } else {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }
        } else {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -2635,19 +2952,21 @@ nfs_buf_write_rpc(struct nfsbuf *bp, int iomode, thread_t thd, kauth_cred_t cred
        struct nfsmount *nmp;
        nfsnode_t np = bp->nb_np;
        int error = 0, nfsvers, async;
        struct nfsmount *nmp;
        nfsnode_t np = bp->nb_np;
        int error = 0, nfsvers, async;

-       int offset, nrpcs;
-       uint32_t nmwsize, length, len;
+       int64_t nrpcs;
+       size_t len;
+       uint32_t nmwsize;

        struct nfsreq *req;
        struct nfsreq_cbinfo cb;
        uio_t auio;
        struct nfsreq *req;
        struct nfsreq_cbinfo cb;
        uio_t auio;

-       char uio_buf [ UIO_SIZEOF(1) ];
+       char uio_buf[UIO_SIZEOF(1)];
+       off_t offset, length;

 
        nmp = NFSTONMP(np);
 
        nmp = NFSTONMP(np);

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                bp->nb_error = error = ENXIO;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);
                bp->nb_error = error = ENXIO;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);

-               return (error);
+               return error;

        }
        nfsvers = nmp->nm_vers;
        nmwsize = nmp->nm_wsize;
        }
        nfsvers = nmp->nm_vers;
        nmwsize = nmp->nm_wsize;


@@ -2665,12 +2984,23 @@ nfs_buf_write_rpc(struct nfsbuf *bp, int iomode, thread_t thd, kauth_cred_t cred
                bp->nb_error = error = EFBIG;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);
                bp->nb_error = error = EFBIG;
                SET(bp->nb_flags, NB_ERROR);
                nfs_buf_iodone(bp);

-               return (error);
+               return error;
+       }
+
+       if (length == 0) {
+               /* We should never get here  */
+#if DEVELOPMENT
+               printf("nfs_buf_write_rpc: Got request with zero length. np %p, bp %p, offset %lld\n", np, bp, offset);
+#else
+               printf("nfs_buf_write_rpc: Got request with zero length.\n");
+#endif /* DEVELOPMENT */
+               nfs_buf_iodone(bp);
+               return 0;

        }
 
        auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,
        }
 
        auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,

-               UIO_WRITE, &uio_buf, sizeof(uio_buf));
-       uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);
+           UIO_WRITE, &uio_buf, sizeof(uio_buf));
+       NFS_UIO_ADDIOV(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);

 
        bp->nb_rpcs = nrpcs = (length + nmwsize - 1) / nmwsize;
        if (async && (nrpcs > 1)) {
 
        bp->nb_rpcs = nrpcs = (length + nmwsize - 1) / nmwsize;
        if (async && (nrpcs > 1)) {


@@ -2684,25 +3014,31 @@ nfs_buf_write_rpc(struct nfsbuf *bp, int iomode, thread_t thd, kauth_cred_t cred
                        error = bp->nb_error;
                        break;
                }
                        error = bp->nb_error;
                        break;
                }

-               len = (length > nmwsize) ? nmwsize : length;
-               cb.rcb_args[0] = offset;
-               cb.rcb_args[1] = len;
-               if (nmp->nm_vers >= NFS_VER4)
-                       cb.rcb_args[2] = nmp->nm_stategenid;
-               if (async && ((error = nfs_async_write_start(nmp))))
+               len = (length > nmwsize) ? nmwsize : (uint32_t)length;
+               cb.rcb_args.offset = offset;
+               cb.rcb_args.length = len;
+#if CONFIG_NFS4
+               if (nmp->nm_vers >= NFS_VER4) {
+                       cb.rcb_args.stategenid = nmp->nm_stategenid;
+               }
+#endif
+               if (async && ((error = nfs_async_write_start(nmp)))) {

                        break;
                        break;

+               }

                req = NULL;
                error = nmp->nm_funcs->nf_write_rpc_async(np, auio, len, thd, cred,
                req = NULL;
                error = nmp->nm_funcs->nf_write_rpc_async(np, auio, len, thd, cred,

-                               iomode, &cb, &req);
+                   iomode, &cb, &req);

                if (error) {
                if (error) {

-                       if (async)
+                       if (async) {

                                nfs_async_write_done(nmp);
                                nfs_async_write_done(nmp);

+                       }

                        break;
                }
                offset += len;
                length -= len;
                        break;
                }
                offset += len;
                length -= len;

-               if (async)
+               if (async) {

                        continue;
                        continue;

+               }

                nfs_buf_write_rpc_finish(req);
        }
 
                nfs_buf_write_rpc_finish(req);
        }
 


@@ -2723,17 +3059,22 @@ nfs_buf_write_rpc(struct nfsbuf *bp, int iomode, thread_t thd, kauth_cred_t cred
                                nfs_buf_write_finish(bp, thd, cred);
                        } else {
                                /* wait for the last RPC to mark it done */
                                nfs_buf_write_finish(bp, thd, cred);
                        } else {
                                /* wait for the last RPC to mark it done */

-                               while (bp->nb_rpcs > 0)
+                               while (bp->nb_rpcs > 0) {

                                        msleep(&bp->nb_rpcs, nfs_buf_mutex, 0,
                                        msleep(&bp->nb_rpcs, nfs_buf_mutex, 0,

-                                               "nfs_buf_write_rpc_cancel", NULL);
+                                           "nfs_buf_write_rpc_cancel", NULL);
+                               }

                                lck_mtx_unlock(nfs_buf_mutex);
                        }
                } else {
                        nfs_buf_write_finish(bp, thd, cred);
                }
                                lck_mtx_unlock(nfs_buf_mutex);
                        }
                } else {
                        nfs_buf_write_finish(bp, thd, cred);
                }

+               /* It may have just been an interrupt... that's OK */
+               if (!ISSET(bp->nb_flags, NB_ERROR)) {
+                       error = 0;
+               }

        }
 
        }
 

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -2742,10 +3083,11 @@ nfs_buf_write_rpc(struct nfsbuf *bp, int iomode, thread_t thd, kauth_cred_t cred
 void
 nfs_buf_write_rpc_finish(struct nfsreq *req)
 {
 void
 nfs_buf_write_rpc_finish(struct nfsreq *req)
 {

-       int error = 0, nfsvers, offset, length, multasyncrpc, finished;
+       int error = 0, nfsvers, multasyncrpc, finished;

        int committed = NFS_WRITE_FILESYNC;
        uint64_t wverf = 0;
        int committed = NFS_WRITE_FILESYNC;
        uint64_t wverf = 0;

-       size_t rlen;
+       off_t offset;
+       size_t rlen, length;

        void *wakeme = NULL;
        struct nfsreq_cbinfo cb;
        struct nfsreq *wreq = NULL;
        void *wakeme = NULL;
        struct nfsreq_cbinfo cb;
        struct nfsreq *wreq = NULL;


@@ -2755,19 +3097,23 @@ nfs_buf_write_rpc_finish(struct nfsreq *req)
        thread_t thd;
        kauth_cred_t cred;
        uio_t auio;
        thread_t thd;
        kauth_cred_t cred;
        uio_t auio;

-       char uio_buf [ UIO_SIZEOF(1) ];
+       char uio_buf[UIO_SIZEOF(1)];

 
 finish:
        np = req->r_np;
        thd = req->r_thread;
        cred = req->r_cred;
 
 finish:
        np = req->r_np;
        thd = req->r_thread;
        cred = req->r_cred;

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_ref(cred);
                kauth_cred_ref(cred);

+       }

        cb = req->r_callback;
        bp = cb.rcb_bp;
        cb = req->r_callback;
        bp = cb.rcb_bp;

+       if (cb.rcb_func) { /* take an extra reference on the nfsreq in case we want to resend it later due to grace error */
+               nfs_request_ref(req, 0);
+       }

 
        nmp = NFSTONMP(np);
 
        nmp = NFSTONMP(np);

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = ENXIO;
        }
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = ENXIO;
        }


@@ -2778,38 +3124,76 @@ finish:
        }
        nfsvers = nmp->nm_vers;
 
        }
        nfsvers = nmp->nm_vers;
 

-       offset = cb.rcb_args[0];
-       rlen = length = cb.rcb_args[1];
+       offset = cb.rcb_args.offset;
+       rlen = length = cb.rcb_args.length;

 
        /* finish the RPC */
        error = nmp->nm_funcs->nf_write_rpc_async_finish(np, req, &committed, &rlen, &wverf);
        if ((error == EINPROGRESS) && cb.rcb_func) {
                /* async request restarted */
 
        /* finish the RPC */
        error = nmp->nm_funcs->nf_write_rpc_async_finish(np, req, &committed, &rlen, &wverf);
        if ((error == EINPROGRESS) && cb.rcb_func) {
                /* async request restarted */

-               if (IS_VALID_CRED(cred))
+               if (cb.rcb_func) {
+                       nfs_request_rele(req);
+               }
+               if (IS_VALID_CRED(cred)) {

                        kauth_cred_unref(&cred);
                        kauth_cred_unref(&cred);

+               }

                return;
        }
                return;
        }

+#if CONFIG_NFS4

        if ((nmp->nm_vers >= NFS_VER4) && nfs_mount_state_error_should_restart(error) && !ISSET(bp->nb_flags, NB_ERROR)) {
                lck_mtx_lock(&nmp->nm_lock);
        if ((nmp->nm_vers >= NFS_VER4) && nfs_mount_state_error_should_restart(error) && !ISSET(bp->nb_flags, NB_ERROR)) {
                lck_mtx_lock(&nmp->nm_lock);

-               if ((error != NFSERR_GRACE) && (cb.rcb_args[2] == nmp->nm_stategenid) && !(nmp->nm_state & NFSSTA_RECOVER)) {
-                       printf("nfs_buf_write_rpc_finish: error %d, initiating recovery\n", error);
-                       nmp->nm_state |= NFSSTA_RECOVER;
-                       nfs_mount_sock_thread_wake(nmp);
+               if ((error != NFSERR_OLD_STATEID) && (error != NFSERR_GRACE) && (cb.rcb_args.stategenid == nmp->nm_stategenid)) {
+                       NP(np, "nfs_buf_write_rpc_finish: error %d @ 0x%llx, 0x%x 0x%x, initiating recovery",
+                           error, NBOFF(bp) + offset, cb.rcb_args.stategenid, nmp->nm_stategenid);
+                       nfs_need_recover(nmp, error);

                }
                lck_mtx_unlock(&nmp->nm_lock);
                }
                lck_mtx_unlock(&nmp->nm_lock);

-               if (error == NFSERR_GRACE)
-                       tsleep(&nmp->nm_state, (PZERO-1), "nfsgrace", 2*hz);
-               if (!(error = nfs_mount_state_wait_for_recovery(nmp))) {
-                       rlen = 0;
-                       goto writeagain;
+               if (np->n_flag & NREVOKE) {
+                       error = EIO;
+               } else {
+                       if (error == NFSERR_GRACE) {
+                               if (cb.rcb_func) {
+                                       /*
+                                        * For an async I/O request, handle a grace delay just like
+                                        * jukebox errors.  Set the resend time and queue it up.
+                                        */
+                                       struct timeval now;
+                                       if (req->r_nmrep.nmc_mhead) {
+                                               mbuf_freem(req->r_nmrep.nmc_mhead);
+                                               req->r_nmrep.nmc_mhead = NULL;
+                                       }
+                                       req->r_error = 0;
+                                       microuptime(&now);
+                                       lck_mtx_lock(&req->r_mtx);
+                                       req->r_resendtime = now.tv_sec + 2;
+                                       req->r_xid = 0;                 // get a new XID
+                                       req->r_flags |= R_RESTART;
+                                       req->r_start = 0;
+                                       nfs_asyncio_resend(req);
+                                       lck_mtx_unlock(&req->r_mtx);
+                                       if (IS_VALID_CRED(cred)) {
+                                               kauth_cred_unref(&cred);
+                                       }
+                                       /* Note: nfsreq reference taken will be dropped later when finished */
+                                       return;
+                               }
+                               /* otherwise, just pause a couple seconds and retry */
+                               tsleep(&nmp->nm_state, (PZERO - 1), "nfsgrace", 2 * hz);
+                       }
+                       if (!(error = nfs_mount_state_wait_for_recovery(nmp))) {
+                               rlen = 0;
+                               goto writeagain;
+                       }

                }
        }
                }
        }

+#endif

        if (error) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }
        if (error) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }

-       if (error || (nfsvers == NFS_VER2))
+       if (error || (nfsvers == NFS_VER2)) {

                goto out;
                goto out;

+       }

        if (rlen <= 0) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = EIO;
        if (rlen <= 0) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error = EIO;


@@ -2817,8 +3201,9 @@ finish:
        }
 
        /* save lowest commit level returned */
        }
 
        /* save lowest commit level returned */

-       if (committed < bp->nb_commitlevel)
+       if (committed < bp->nb_commitlevel) {

                bp->nb_commitlevel = committed;
                bp->nb_commitlevel = committed;

+       }

 
        /* check the write verifier */
        if (!bp->nb_verf) {
 
        /* check the write verifier */
        if (!bp->nb_verf) {


@@ -2830,6 +3215,10 @@ finish:
                bp->nb_verf = wverf;
        }
 
                bp->nb_verf = wverf;
        }
 

+       if (!ISSET(bp->nb_flags, NB_STALEWVERF) && rlen > 0 && (bp->nb_offio < (offset + (int)rlen))) {
+               bp->nb_offio = offset + rlen;
+       }
+

        /*
         * check for a short write
         *
        /*
         * check for a short write
         *


@@ -2837,32 +3226,38 @@ finish:
         * need to issue another write for the rest of it.
         * (Don't bother if the buffer hit an error or stale wverf.)
         */
         * need to issue another write for the rest of it.
         * (Don't bother if the buffer hit an error or stale wverf.)
         */

-       if (((int)rlen < length) && !(bp->nb_flags & (NB_STALEWVERF|NB_ERROR))) {
+       if ((rlen < length) && !(bp->nb_flags & (NB_STALEWVERF | NB_ERROR))) {
+#if CONFIG_NFS4

 writeagain:
 writeagain:

+#endif

                offset += rlen;
                length -= rlen;
 
                auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,
                offset += rlen;
                length -= rlen;
 
                auio = uio_createwithbuffer(1, NBOFF(bp) + offset, UIO_SYSSPACE,

-                       UIO_WRITE, &uio_buf, sizeof(uio_buf));
+                   UIO_WRITE, &uio_buf, sizeof(uio_buf));

                uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);
 
                uio_addiov(auio, CAST_USER_ADDR_T(bp->nb_data + offset), length);
 

-               cb.rcb_args[0] = offset;
-               cb.rcb_args[1] = length;
-               if (nmp->nm_vers >= NFS_VER4)
-                       cb.rcb_args[2] = nmp->nm_stategenid;
-
+               cb.rcb_args.offset = offset;
+               cb.rcb_args.length = length;
+#if CONFIG_NFS4
+               if (nmp->nm_vers >= NFS_VER4) {
+                       cb.rcb_args.stategenid = nmp->nm_stategenid;
+               }
+#endif

                // XXX iomode should really match the original request
                error = nmp->nm_funcs->nf_write_rpc_async(np, auio, length, thd, cred,
                // XXX iomode should really match the original request
                error = nmp->nm_funcs->nf_write_rpc_async(np, auio, length, thd, cred,

-                               NFS_WRITE_FILESYNC, &cb, &wreq);
+                   NFS_WRITE_FILESYNC, &cb, &wreq);

                if (!error) {
                if (!error) {

-                       if (IS_VALID_CRED(cred))
+                       if (IS_VALID_CRED(cred)) {

                                kauth_cred_unref(&cred);
                                kauth_cred_unref(&cred);

+                       }

                        if (!cb.rcb_func) {
                                /* if !async we'll need to wait for this RPC to finish */
                                req = wreq;
                                wreq = NULL;
                                goto finish;
                        }
                        if (!cb.rcb_func) {
                                /* if !async we'll need to wait for this RPC to finish */
                                req = wreq;
                                wreq = NULL;
                                goto finish;
                        }

+                       nfs_request_rele(req);

                        /*
                         * We're done here.
                         * Outstanding RPC count is unchanged.
                        /*
                         * We're done here.
                         * Outstanding RPC count is unchanged.


@@ -2875,8 +3270,10 @@ writeagain:
        }
 
 out:
        }
 
 out:

-       if (cb.rcb_func)
+       if (cb.rcb_func) {

                nfs_async_write_done(nmp);
                nfs_async_write_done(nmp);

+               nfs_request_rele(req);
+       }

        /*
         * Decrement outstanding RPC count on buffer
         * and call nfs_buf_write_finish on last RPC.
        /*
         * Decrement outstanding RPC count on buffer
         * and call nfs_buf_write_finish on last RPC.


@@ -2886,29 +3283,38 @@ out:
         * aborting a partially-initiated set of RPCs)
         */
        multasyncrpc = ISSET(bp->nb_flags, NB_MULTASYNCRPC);
         * aborting a partially-initiated set of RPCs)
         */
        multasyncrpc = ISSET(bp->nb_flags, NB_MULTASYNCRPC);

-       if (multasyncrpc)
+       if (multasyncrpc) {

                lck_mtx_lock(nfs_buf_mutex);
                lck_mtx_lock(nfs_buf_mutex);

+       }

 
        bp->nb_rpcs--;
        finished = (bp->nb_rpcs == 0);
 
 
        bp->nb_rpcs--;
        finished = (bp->nb_rpcs == 0);
 

-       if (multasyncrpc)
+       if (multasyncrpc) {

                lck_mtx_unlock(nfs_buf_mutex);
                lck_mtx_unlock(nfs_buf_mutex);

+       }

 
        if (finished) {
 
        if (finished) {

-               if (multasyncrpc)
+               if (multasyncrpc) {

                        wakeme = &bp->nb_rpcs;
                        wakeme = &bp->nb_rpcs;

+               }

                nfs_buf_write_finish(bp, thd, cred);
                nfs_buf_write_finish(bp, thd, cred);

-               if (wakeme)
+               if (wakeme) {

                        wakeup(wakeme);
                        wakeup(wakeme);

+               }

        }
 
        }
 

-       if (IS_VALID_CRED(cred))
+       if (IS_VALID_CRED(cred)) {

                kauth_cred_unref(&cred);
                kauth_cred_unref(&cred);

+       }
+
+       if (cb.rcb_func && np->n_needcommitcnt >= NFS_A_LOT_OF_NEEDCOMMITS) {
+               nfs_flushcommits(np, 1);
+       }

 }
 
 /*
 }
 
 /*

- * Send commit(s) for the given node's "needcommit" buffers 
+ * Send commit(s) for the given node's "needcommit" buffers

  */
 int
 nfs_flushcommits(nfsnode_t np, int nowait)
  */
 int
 nfs_flushcommits(nfsnode_t np, int nowait)


@@ -2916,10 +3322,11 @@ nfs_flushcommits(nfsnode_t np, int nowait)
        struct nfsmount *nmp;
        struct nfsbuf *bp, *prevlbp, *lbp;
        struct nfsbuflists blist, commitlist;
        struct nfsmount *nmp;
        struct nfsbuf *bp, *prevlbp, *lbp;
        struct nfsbuflists blist, commitlist;

-       int error = 0, retv, wcred_set, flags, dirty;
+       int error = 0, retv, wcred_set, flags;

        u_quad_t off, endoff, toff;
        u_quad_t off, endoff, toff;

-       u_int32_t count;
+       uint64_t wverf, count;

        kauth_cred_t wcred = NULL;
        kauth_cred_t wcred = NULL;

+       nfsbufpgs dirty;

 
        FSDBG_TOP(557, np, 0, 0, 0);
 
 
        FSDBG_TOP(557, np, 0, 0, 0);
 


@@ -2931,8 +3338,9 @@ nfs_flushcommits(nfsnode_t np, int nowait)
         */
        if (!LIST_EMPTY(&np->n_dirtyblkhd)) {
                error = nfs_node_lock(np);
         */
        if (!LIST_EMPTY(&np->n_dirtyblkhd)) {
                error = nfs_node_lock(np);

-               if (error)
+               if (error) {

                        goto done;
                        goto done;

+               }

                np->n_flag |= NMODIFIED;
                nfs_node_unlock(np);
        }
                np->n_flag |= NMODIFIED;
                nfs_node_unlock(np);
        }


@@ -2943,7 +3351,7 @@ nfs_flushcommits(nfsnode_t np, int nowait)
        LIST_INIT(&commitlist);
 
        nmp = NFSTONMP(np);
        LIST_INIT(&commitlist);
 
        nmp = NFSTONMP(np);

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                error = ENXIO;
                goto done;
        }
                error = ENXIO;
                goto done;
        }


@@ -2953,20 +3361,24 @@ nfs_flushcommits(nfsnode_t np, int nowait)
        }
 
        flags = NBI_DIRTY;
        }
 
        flags = NBI_DIRTY;

-       if (nowait)
+       if (nowait) {

                flags |= NBI_NOWAIT;
                flags |= NBI_NOWAIT;

+       }

        lck_mtx_lock(nfs_buf_mutex);
        lck_mtx_lock(nfs_buf_mutex);

+       wverf = nmp->nm_verf;

        if (!nfs_buf_iterprepare(np, &blist, flags)) {
                while ((bp = LIST_FIRST(&blist))) {
                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        error = nfs_buf_acquire(bp, NBAC_NOWAIT, 0, 0);
        if (!nfs_buf_iterprepare(np, &blist, flags)) {
                while ((bp = LIST_FIRST(&blist))) {
                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        error = nfs_buf_acquire(bp, NBAC_NOWAIT, 0, 0);

-                       if (error)
+                       if (error) {

                                continue;
                                continue;

-                       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT))
+                       }
+                       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {

                                nfs_buf_check_write_verifier(np, bp);
                                nfs_buf_check_write_verifier(np, bp);

-                       if (((bp->nb_flags & (NB_DELWRI | NB_NEEDCOMMIT))
-                               != (NB_DELWRI | NB_NEEDCOMMIT))) {
+                       }
+                       if (((bp->nb_flags & (NB_DELWRI | NB_NEEDCOMMIT)) != (NB_DELWRI | NB_NEEDCOMMIT)) ||
+                           (bp->nb_verf != wverf)) {

                                nfs_buf_drop(bp);
                                continue;
                        }
                                nfs_buf_drop(bp);
                                continue;
                        }


@@ -2976,7 +3388,7 @@ nfs_flushcommits(nfsnode_t np, int nowait)
 
                        FSDBG(557, bp, bp->nb_flags, bp->nb_valid, bp->nb_dirty);
                        FSDBG(557, bp->nb_validoff, bp->nb_validend,
 
                        FSDBG(557, bp, bp->nb_flags, bp->nb_valid, bp->nb_dirty);
                        FSDBG(557, bp->nb_validoff, bp->nb_validend,

-                             bp->nb_dirtyoff, bp->nb_dirtyend);
+                           bp->nb_dirtyoff, bp->nb_dirtyend);

 
                        /*
                         * Work out if all buffers are using the same cred
 
                        /*
                         * Work out if all buffers are using the same cred


@@ -2987,8 +3399,9 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                         */
                        if (wcred_set == 0) {
                                wcred = bp->nb_wcred;
                         */
                        if (wcred_set == 0) {
                                wcred = bp->nb_wcred;

-                               if (!IS_VALID_CRED(wcred))
+                               if (!IS_VALID_CRED(wcred)) {

                                        panic("nfs: needcommit w/out wcred");
                                        panic("nfs: needcommit w/out wcred");

+                               }

                                wcred_set = 1;
                        } else if ((wcred_set == 1) && wcred != bp->nb_wcred) {
                                wcred_set = -1;
                                wcred_set = 1;
                        } else if ((wcred_set == 1) && wcred != bp->nb_wcred) {
                                wcred_set = -1;


@@ -3002,23 +3415,27 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                         */
                        prevlbp = NULL;
                        LIST_FOREACH(lbp, &commitlist, nb_vnbufs) {
                         */
                        prevlbp = NULL;
                        LIST_FOREACH(lbp, &commitlist, nb_vnbufs) {

-                               if (bp->nb_lblkno < lbp->nb_lblkno)
+                               if (bp->nb_lblkno < lbp->nb_lblkno) {

                                        break;
                                        break;

+                               }

                                prevlbp = lbp;
                        }
                        LIST_REMOVE(bp, nb_vnbufs);
                                prevlbp = lbp;
                        }
                        LIST_REMOVE(bp, nb_vnbufs);

-                       if (prevlbp)
+                       if (prevlbp) {

                                LIST_INSERT_AFTER(prevlbp, bp, nb_vnbufs);
                                LIST_INSERT_AFTER(prevlbp, bp, nb_vnbufs);

-                       else
+                       } else {

                                LIST_INSERT_HEAD(&commitlist, bp, nb_vnbufs);
                                LIST_INSERT_HEAD(&commitlist, bp, nb_vnbufs);

+                       }

 
                        /* update commit range start, end */
                        toff = NBOFF(bp) + bp->nb_dirtyoff;
 
                        /* update commit range start, end */
                        toff = NBOFF(bp) + bp->nb_dirtyoff;

-                       if (toff < off)
+                       if (toff < off) {

                                off = toff;
                                off = toff;

+                       }

                        toff += (u_quad_t)(bp->nb_dirtyend - bp->nb_dirtyoff);
                        toff += (u_quad_t)(bp->nb_dirtyend - bp->nb_dirtyoff);

-                       if (toff > endoff)
+                       if (toff > endoff) {

                                endoff = toff;
                                endoff = toff;

+                       }

                }
                nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
        }
                }
                nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
        }


@@ -3045,7 +3462,8 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                        if (retv) {
                                /* Unable to create the UPL, the VM object probably no longer exists. */
                                printf("nfs_flushcommits: upl create failed %d\n", retv);
                        if (retv) {
                                /* Unable to create the UPL, the VM object probably no longer exists. */
                                printf("nfs_flushcommits: upl create failed %d\n", retv);

-                               bp->nb_valid = bp->nb_dirty = 0;
+                               NBPGS_ERASE(&bp->nb_valid);
+                               NBPGS_ERASE(&bp->nb_dirty);

                        }
                }
                nfs_buf_upl_check(bp);
                        }
                }
                nfs_buf_upl_check(bp);


@@ -3062,19 +3480,21 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                 * Note, it's possible the commit range could be >2^32-1.
                 * If it is, we'll send one commit that covers the whole file.
                 */
                 * Note, it's possible the commit range could be >2^32-1.
                 * If it is, we'll send one commit that covers the whole file.
                 */

-               if ((endoff - off) > 0xffffffff)
+               if ((endoff - off) > 0xffffffff) {

                        count = 0;
                        count = 0;

-               else
+               } else {

                        count = (endoff - off);
                        count = (endoff - off);

-               retv = nmp->nm_funcs->nf_commit_rpc(np, off, count, wcred);
+               }
+               retv = nmp->nm_funcs->nf_commit_rpc(np, off, count, wcred, wverf);

        } else {
                retv = 0;
                LIST_FOREACH(bp, &commitlist, nb_vnbufs) {
                        toff = NBOFF(bp) + bp->nb_dirtyoff;
                        count = bp->nb_dirtyend - bp->nb_dirtyoff;
        } else {
                retv = 0;
                LIST_FOREACH(bp, &commitlist, nb_vnbufs) {
                        toff = NBOFF(bp) + bp->nb_dirtyoff;
                        count = bp->nb_dirtyend - bp->nb_dirtyoff;

-                       retv = nmp->nm_funcs->nf_commit_rpc(np, toff, count, bp->nb_wcred);
-                       if (retv)
+                       retv = nmp->nm_funcs->nf_commit_rpc(np, toff, count, bp->nb_wcred, wverf);
+                       if (retv) {

                                break;
                                break;

+                       }

                }
        }
 
                }
        }
 


@@ -3112,13 +3532,15 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                        lck_mtx_unlock(nfs_buf_mutex);
                        wakeup(&nfs_nbdwrite);
                }
                        lck_mtx_unlock(nfs_buf_mutex);
                        wakeup(&nfs_nbdwrite);
                }

-               CLR(bp->nb_flags, (NB_READ|NB_DONE|NB_ERROR|NB_DELWRI));
+               CLR(bp->nb_flags, (NB_READ | NB_DONE | NB_ERROR | NB_DELWRI));

                /* if block still has dirty pages, we don't want it to */
                /* be released in nfs_buf_iodone().  So, don't set NB_ASYNC. */
                /* if block still has dirty pages, we don't want it to */
                /* be released in nfs_buf_iodone().  So, don't set NB_ASYNC. */

-               if (!(dirty = bp->nb_dirty))
+               NBPGS_COPY(&dirty, &bp->nb_dirty);
+               if (!nfs_buf_pgs_is_set(&dirty)) {

                        SET(bp->nb_flags, NB_ASYNC);
                        SET(bp->nb_flags, NB_ASYNC);

-               else
+               } else {

                        CLR(bp->nb_flags, NB_ASYNC);
                        CLR(bp->nb_flags, NB_ASYNC);

+               }

 
                /* move to clean list */
                lck_mtx_lock(nfs_buf_mutex);
 
                /* move to clean list */
                lck_mtx_lock(nfs_buf_mutex);


@@ -3128,7 +3550,7 @@ nfs_flushcommits(nfsnode_t np, int nowait)
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
 
                nfs_buf_iodone(bp);
                bp->nb_dirtyoff = bp->nb_dirtyend = 0;
 
                nfs_buf_iodone(bp);

-               if (dirty) {
+               if (nfs_buf_pgs_is_set(&dirty)) {

                        /* throw it back in as a delayed write buffer */
                        CLR(bp->nb_flags, NB_DONE);
                        nfs_buf_write_delayed(bp);
                        /* throw it back in as a delayed write buffer */
                        CLR(bp->nb_flags, NB_DONE);
                        nfs_buf_write_delayed(bp);


@@ -3137,12 +3559,12 @@ nfs_flushcommits(nfsnode_t np, int nowait)
 
 done:
        FSDBG_BOT(557, np, 0, 0, error);
 
 done:
        FSDBG_BOT(557, np, 0, 0, error);

-       return (error);
+       return error;

 }
 
 /*
  * Flush all the blocks associated with a vnode.
 }
 
 /*
  * Flush all the blocks associated with a vnode.

- *     Walk through the buffer pool and push any dirty pages
+ *      Walk through the buffer pool and push any dirty pages

  *     associated with the vnode.
  */
 int
  *     associated with the vnode.
  */
 int


@@ -3156,13 +3578,14 @@ nfs_flush(nfsnode_t np, int waitfor, thread_t thd, int ignore_writeerr)
 
        FSDBG_TOP(517, np, waitfor, ignore_writeerr, 0);
 
 
        FSDBG_TOP(517, np, waitfor, ignore_writeerr, 0);
 

-       if (!nmp) {
+       if (nfs_mount_gone(nmp)) {

                error = ENXIO;
                goto out;
        }
        nfsvers = nmp->nm_vers;
                error = ENXIO;
                goto out;
        }
        nfsvers = nmp->nm_vers;

-       if (nmp->nm_flag & NFSMNT_INT)
+       if (NMFLAG(nmp, INTR)) {

                slpflag = PCATCH;
                slpflag = PCATCH;

+       }

 
        if (!LIST_EMPTY(&np->n_dirtyblkhd)) {
                nfs_node_lock_force(np);
 
        if (!LIST_EMPTY(&np->n_dirtyblkhd)) {
                nfs_node_lock_force(np);


@@ -3173,8 +3596,9 @@ nfs_flush(nfsnode_t np, int waitfor, thread_t thd, int ignore_writeerr)
        lck_mtx_lock(nfs_buf_mutex);
        while (np->n_bflag & NBFLUSHINPROG) {
                np->n_bflag |= NBFLUSHWANT;
        lck_mtx_lock(nfs_buf_mutex);
        while (np->n_bflag & NBFLUSHINPROG) {
                np->n_bflag |= NBFLUSHWANT;

-               msleep(&np->n_bflag, nfs_buf_mutex, slpflag, "nfs_flush", NULL);
-               if ((error = nfs_sigintr(NFSTONMP(np), NULL, thd, 0))) {
+               error = msleep(&np->n_bflag, nfs_buf_mutex, slpflag, "nfs_flush", NULL);
+               if ((error && (error != EWOULDBLOCK)) ||
+                   ((error = nfs_sigintr(NFSTONMP(np), NULL, thd, 0)))) {

                        lck_mtx_unlock(nfs_buf_mutex);
                        goto out;
                }
                        lck_mtx_unlock(nfs_buf_mutex);
                        goto out;
                }


@@ -3202,17 +3626,20 @@ again:
                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        flags = (passone || !(waitfor == MNT_WAIT || waitfor == MNT_DWAIT)) ? NBAC_NOWAIT : 0;
                        LIST_REMOVE(bp, nb_vnbufs);
                        LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                        flags = (passone || !(waitfor == MNT_WAIT || waitfor == MNT_DWAIT)) ? NBAC_NOWAIT : 0;

-                       if (flags != NBAC_NOWAIT)
+                       if (flags != NBAC_NOWAIT) {

                                nfs_buf_refget(bp);
                                nfs_buf_refget(bp);

+                       }

                        while ((error = nfs_buf_acquire(bp, flags, slpflag, slptimeo))) {
                                FSDBG(524, bp, flags, bp->nb_lflags, bp->nb_flags);
                        while ((error = nfs_buf_acquire(bp, flags, slpflag, slptimeo))) {
                                FSDBG(524, bp, flags, bp->nb_lflags, bp->nb_flags);

-                               if (error == EBUSY)
+                               if (error == EBUSY) {

                                        break;
                                        break;

+                               }

                                if (error) {
                                        error2 = nfs_sigintr(NFSTONMP(np), NULL, thd, 0);
                                        if (error2) {
                                if (error) {
                                        error2 = nfs_sigintr(NFSTONMP(np), NULL, thd, 0);
                                        if (error2) {

-                                               if (flags != NBAC_NOWAIT)
+                                               if (flags != NBAC_NOWAIT) {

                                                        nfs_buf_refrele(bp);
                                                        nfs_buf_refrele(bp);

+                                               }

                                                nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
                                                lck_mtx_unlock(nfs_buf_mutex);
                                                error = error2;
                                                nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
                                                lck_mtx_unlock(nfs_buf_mutex);
                                                error = error2;


@@ -3224,17 +3651,20 @@ again:
                                        }
                                }
                        }
                                        }
                                }
                        }

-                       if (flags != NBAC_NOWAIT)
+                       if (flags != NBAC_NOWAIT) {

                                nfs_buf_refrele(bp);
                                nfs_buf_refrele(bp);

-                       if (error == EBUSY)
+                       }
+                       if (error == EBUSY) {

                                continue;
                                continue;

+                       }

                        if (!bp->nb_np) {
                                /* buffer is no longer valid */
                                nfs_buf_drop(bp);
                                continue;
                        }
                        if (!bp->nb_np) {
                                /* buffer is no longer valid */
                                nfs_buf_drop(bp);
                                continue;
                        }

-                       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT))
+                       if (ISSET(bp->nb_flags, NB_NEEDCOMMIT)) {

                                nfs_buf_check_write_verifier(np, bp);
                                nfs_buf_check_write_verifier(np, bp);

+                       }

                        if (!ISSET(bp->nb_flags, NB_DELWRI)) {
                                /* buffer is no longer dirty */
                                nfs_buf_drop(bp);
                        if (!ISSET(bp->nb_flags, NB_DELWRI)) {
                                /* buffer is no longer dirty */
                                nfs_buf_drop(bp);


@@ -3270,10 +3700,10 @@ again:
        lck_mtx_unlock(nfs_buf_mutex);
 
        if (waitfor == MNT_WAIT || waitfor == MNT_DWAIT) {
        lck_mtx_unlock(nfs_buf_mutex);
 
        if (waitfor == MNT_WAIT || waitfor == MNT_DWAIT) {

-               while ((error = vnode_waitforwrites(NFSTOV(np), 0, slpflag, slptimeo, "nfsflush"))) {
-                       error2 = nfs_sigintr(NFSTONMP(np), NULL, thd, 0);
+               while ((error = vnode_waitforwrites(NFSTOV(np), 0, slpflag, slptimeo, "nfsflush"))) {
+                       error2 = nfs_sigintr(NFSTONMP(np), NULL, thd, 0);

                        if (error2) {
                        if (error2) {

-                               error = error2;
+                               error = error2;

                                goto done;
                        }
                        if (slpflag == PCATCH) {
                                goto done;
                        }
                        if (slpflag == PCATCH) {


@@ -3286,9 +3716,11 @@ again:
        if (nfsvers != NFS_VER2) {
                /* loop while it looks like there are still buffers to be */
                /* commited and nfs_flushcommits() seems to be handling them. */
        if (nfsvers != NFS_VER2) {
                /* loop while it looks like there are still buffers to be */
                /* commited and nfs_flushcommits() seems to be handling them. */

-               while (np->n_needcommitcnt)
-                       if (nfs_flushcommits(np, 0))
+               while (np->n_needcommitcnt) {
+                       if (nfs_flushcommits(np, 0)) {

                                break;
                                break;

+                       }
+               }

        }
 
        if (passone) {
        }
 
        if (passone) {


@@ -3309,8 +3741,9 @@ again:
                        nfs_node_unlock(np);
                }
                lck_mtx_lock(nfs_buf_mutex);
                        nfs_node_unlock(np);
                }
                lck_mtx_lock(nfs_buf_mutex);

-               if (!LIST_EMPTY(&np->n_dirtyblkhd))
+               if (!LIST_EMPTY(&np->n_dirtyblkhd)) {

                        goto again;
                        goto again;

+               }

                lck_mtx_unlock(nfs_buf_mutex);
                nfs_node_lock_force(np);
                /*
                lck_mtx_unlock(nfs_buf_mutex);
                nfs_node_lock_force(np);
                /*


@@ -3344,13 +3777,14 @@ again:
 done:
        lck_mtx_lock(nfs_buf_mutex);
        flags = np->n_bflag;
 done:
        lck_mtx_lock(nfs_buf_mutex);
        flags = np->n_bflag;

-       np->n_bflag &= ~(NBFLUSHINPROG|NBFLUSHWANT);
+       np->n_bflag &= ~(NBFLUSHINPROG | NBFLUSHWANT);

        lck_mtx_unlock(nfs_buf_mutex);
        lck_mtx_unlock(nfs_buf_mutex);

-       if (flags & NBFLUSHWANT)
+       if (flags & NBFLUSHWANT) {

                wakeup(&np->n_bflag);
                wakeup(&np->n_bflag);

+       }

 out:
        FSDBG_BOT(517, np, error, ignore_writeerr, 0);
 out:
        FSDBG_BOT(517, np, error, ignore_writeerr, 0);

-       return (error);
+       return error;

 }
 
 /*
 }
 
 /*


@@ -3371,8 +3805,9 @@ nfs_vinvalbuf_internal(
        int list, error = 0;
 
        if (flags & V_SAVE) {
        int list, error = 0;
 
        if (flags & V_SAVE) {

-               if ((error = nfs_flush(np, MNT_WAIT, thd, (flags & V_IGNORE_WRITEERR))))
-                       return (error);
+               if ((error = nfs_flush(np, MNT_WAIT, thd, (flags & V_IGNORE_WRITEERR)))) {
+                       return error;
+               }

        }
 
        lck_mtx_lock(nfs_buf_mutex);
        }
 
        lck_mtx_lock(nfs_buf_mutex);


@@ -3380,15 +3815,17 @@ nfs_vinvalbuf_internal(
                list = NBI_CLEAN;
                if (nfs_buf_iterprepare(np, &blist, list)) {
                        list = NBI_DIRTY;
                list = NBI_CLEAN;
                if (nfs_buf_iterprepare(np, &blist, list)) {
                        list = NBI_DIRTY;

-                       if (nfs_buf_iterprepare(np, &blist, list))
+                       if (nfs_buf_iterprepare(np, &blist, list)) {

                                break;
                                break;

+                       }

                }
                while ((bp = LIST_FIRST(&blist))) {
                        LIST_REMOVE(bp, nb_vnbufs);
                }
                while ((bp = LIST_FIRST(&blist))) {
                        LIST_REMOVE(bp, nb_vnbufs);

-                       if (list == NBI_CLEAN)
+                       if (list == NBI_CLEAN) {

                                LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
                                LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);

-                       else
+                       } else {

                                LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
                                LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);

+                       }

                        nfs_buf_refget(bp);
                        while ((error = nfs_buf_acquire(bp, NBAC_REMOVE, slpflag, slptimeo))) {
                                FSDBG(556, np, bp, NBOFF(bp), bp->nb_flags);
                        nfs_buf_refget(bp);
                        while ((error = nfs_buf_acquire(bp, NBAC_REMOVE, slpflag, slptimeo))) {
                                FSDBG(556, np, bp, NBOFF(bp), bp->nb_flags);


@@ -3397,7 +3834,7 @@ nfs_vinvalbuf_internal(
                                        nfs_buf_refrele(bp);
                                        nfs_buf_itercomplete(np, &blist, list);
                                        lck_mtx_unlock(nfs_buf_mutex);
                                        nfs_buf_refrele(bp);
                                        nfs_buf_itercomplete(np, &blist, list);
                                        lck_mtx_unlock(nfs_buf_mutex);

-                                       return (error);
+                                       return error;

                                }
                        }
                        nfs_buf_refrele(bp);
                                }
                        }
                        nfs_buf_refrele(bp);


@@ -3407,18 +3844,21 @@ nfs_vinvalbuf_internal(
                            (NBOFF(bp) < (off_t)np->n_size)) {
                                /* extra paranoia: make sure we're not */
                                /* somehow leaving any dirty data around */
                            (NBOFF(bp) < (off_t)np->n_size)) {
                                /* extra paranoia: make sure we're not */
                                /* somehow leaving any dirty data around */

+                               nfsbufpgs pagemask;

                                int mustwrite = 0;
                                int mustwrite = 0;

-                               int end = (NBOFF(bp) + bp->nb_bufsize > (off_t)np->n_size) ?
-                                   ((off_t)np->n_size - NBOFF(bp)) : bp->nb_bufsize;
+                               off_t end = (NBOFF(bp) + bp->nb_bufsize > (off_t)np->n_size) ?
+                                   (np->n_size - NBOFF(bp)) : bp->nb_bufsize;

                                if (!ISSET(bp->nb_flags, NB_PAGELIST)) {
                                        error = nfs_buf_upl_setup(bp);
                                        if (error == EINVAL) {
                                                /* vm object must no longer exist */
                                                /* hopefully we don't need to do */
                                                /* anything for this buffer */
                                if (!ISSET(bp->nb_flags, NB_PAGELIST)) {
                                        error = nfs_buf_upl_setup(bp);
                                        if (error == EINVAL) {
                                                /* vm object must no longer exist */
                                                /* hopefully we don't need to do */
                                                /* anything for this buffer */

-                                       } else if (error)
+                                       } else if (error) {

                                                printf("nfs_vinvalbuf: upl setup failed %d\n", error);
                                                printf("nfs_vinvalbuf: upl setup failed %d\n", error);

-                                       bp->nb_valid = bp->nb_dirty = 0;
+                                       }
+                                       NBPGS_ERASE(&bp->nb_valid);
+                                       NBPGS_ERASE(&bp->nb_dirty);

                                }
                                nfs_buf_upl_check(bp);
                                /* check for any dirty data before the EOF */
                                }
                                nfs_buf_upl_check(bp);
                                /* check for any dirty data before the EOF */


@@ -3426,15 +3866,19 @@ nfs_vinvalbuf_internal(
                                        /* clip dirty range to EOF */
                                        if (bp->nb_dirtyend > end) {
                                                bp->nb_dirtyend = end;
                                        /* clip dirty range to EOF */
                                        if (bp->nb_dirtyend > end) {
                                                bp->nb_dirtyend = end;

-                                               if (bp->nb_dirtyoff >= bp->nb_dirtyend)
+                                               if (bp->nb_dirtyoff >= bp->nb_dirtyend) {

                                                        bp->nb_dirtyoff = bp->nb_dirtyend = 0;
                                                        bp->nb_dirtyoff = bp->nb_dirtyend = 0;

+                                               }

                                        }
                                        }

-                                       if ((bp->nb_dirtyend > 0) && (bp->nb_dirtyoff < end))
+                                       if ((bp->nb_dirtyend > 0) && (bp->nb_dirtyoff < end)) {

                                                mustwrite++;
                                                mustwrite++;

+                                       }

                                }
                                }

-                               bp->nb_dirty &= (1 << (round_page_32(end)/PAGE_SIZE)) - 1;
-                               if (bp->nb_dirty)
+                               nfs_buf_pgs_get_page_mask(&pagemask, round_page_64(end) / PAGE_SIZE);
+                               nfs_buf_pgs_bit_and(&bp->nb_dirty, &pagemask, &bp->nb_dirty);
+                               if (nfs_buf_pgs_is_set(&bp->nb_dirty)) {

                                        mustwrite++;
                                        mustwrite++;

+                               }

                                /* also make sure we'll have a credential to do the write */
                                if (mustwrite && !IS_VALID_CRED(bp->nb_wcred) && !IS_VALID_CRED(cred)) {
                                        printf("nfs_vinvalbuf: found dirty buffer with no write creds\n");
                                /* also make sure we'll have a credential to do the write */
                                if (mustwrite && !IS_VALID_CRED(bp->nb_wcred) && !IS_VALID_CRED(cred)) {
                                        printf("nfs_vinvalbuf: found dirty buffer with no write creds\n");


@@ -3442,8 +3886,9 @@ nfs_vinvalbuf_internal(
                                }
                                if (mustwrite) {
                                        FSDBG(554, np, bp, 0xd00dee, bp->nb_flags);
                                }
                                if (mustwrite) {
                                        FSDBG(554, np, bp, 0xd00dee, bp->nb_flags);

-                                       if (!ISSET(bp->nb_flags, NB_PAGELIST))
+                                       if (!ISSET(bp->nb_flags, NB_PAGELIST)) {

                                                panic("nfs_vinvalbuf: dirty buffer without upl");
                                                panic("nfs_vinvalbuf: dirty buffer without upl");

+                                       }

                                        /* gotta write out dirty data before invalidating */
                                        /* (NB_STABLE indicates that data writes should be FILESYNC) */
                                        /* (NB_NOCACHE indicates buffer should be discarded) */
                                        /* gotta write out dirty data before invalidating */
                                        /* (NB_STABLE indicates that data writes should be FILESYNC) */
                                        /* (NB_NOCACHE indicates buffer should be discarded) */


@@ -3458,8 +3903,10 @@ nfs_vinvalbuf_internal(
                                        if (error) {
                                                FSDBG(554, bp, 0xd00dee, 0xbad, error);
                                                nfs_node_lock_force(np);
                                        if (error) {
                                                FSDBG(554, bp, 0xd00dee, 0xbad, error);
                                                nfs_node_lock_force(np);

-                                               np->n_error = error;
-                                               np->n_flag |= NWRITEERR;
+                                               if ((error != EINTR) && (error != ERESTART)) {
+                                                       np->n_error = error;
+                                                       np->n_flag |= NWRITEERR;
+                                               }

                                                /*
                                                 * There was a write error and we need to
                                                 * invalidate attrs to sync with server.
                                                /*
                                                 * There was a write error and we need to
                                                 * invalidate attrs to sync with server.


@@ -3468,7 +3915,7 @@ nfs_vinvalbuf_internal(
                                                 */
                                                NATTRINVALIDATE(np);
                                                nfs_node_unlock(np);
                                                 */
                                                NATTRINVALIDATE(np);
                                                nfs_node_unlock(np);

-                                               if (error == EINTR) {
+                                               if ((error == EINTR) || (error == ERESTART)) {

                                                        /*
                                                         * Abort on EINTR.  If we don't, we could
                                                         * be stuck in this loop forever because
                                                        /*
                                                         * Abort on EINTR.  If we don't, we could
                                                         * be stuck in this loop forever because


@@ -3477,7 +3924,7 @@ nfs_vinvalbuf_internal(
                                                        lck_mtx_lock(nfs_buf_mutex);
                                                        nfs_buf_itercomplete(np, &blist, list);
                                                        lck_mtx_unlock(nfs_buf_mutex);
                                                        lck_mtx_lock(nfs_buf_mutex);
                                                        nfs_buf_itercomplete(np, &blist, list);
                                                        lck_mtx_unlock(nfs_buf_mutex);

-                                                       return (error);
+                                                       return error;

                                                }
                                                error = 0;
                                        }
                                                }
                                                error = 0;
                                        }


@@ -3492,17 +3939,20 @@ nfs_vinvalbuf_internal(
                }
                nfs_buf_itercomplete(np, &blist, list);
        }
                }
                nfs_buf_itercomplete(np, &blist, list);
        }

-       if (!LIST_EMPTY(&(np)->n_dirtyblkhd) || !LIST_EMPTY(&(np)->n_cleanblkhd))
+       if (!LIST_EMPTY(&(np)->n_dirtyblkhd) || !LIST_EMPTY(&(np)->n_cleanblkhd)) {

                panic("nfs_vinvalbuf: flush/inval failed");
                panic("nfs_vinvalbuf: flush/inval failed");

+       }

        lck_mtx_unlock(nfs_buf_mutex);
        nfs_node_lock_force(np);
        lck_mtx_unlock(nfs_buf_mutex);
        nfs_node_lock_force(np);

-       if (!(flags & V_SAVE))
+       if (!(flags & V_SAVE)) {

                np->n_flag &= ~NMODIFIED;
                np->n_flag &= ~NMODIFIED;

-       if (vnode_vtype(NFSTOV(np)) == VREG)
+       }
+       if (vnode_vtype(NFSTOV(np)) == VREG) {

                np->n_lastrahead = -1;
                np->n_lastrahead = -1;

+       }

        nfs_node_unlock(np);
        NFS_BUF_FREEUP();
        nfs_node_unlock(np);
        NFS_BUF_FREEUP();

-       return (0);
+       return 0;

 }
 
 
 }
 
 


@@ -3521,13 +3971,25 @@ nfs_vinvalbuf2(vnode_t vp, int flags, thread_t thd, kauth_cred_t cred, int intrf
 {
        nfsnode_t np = VTONFS(vp);
        struct nfsmount *nmp = VTONMP(vp);
 {
        nfsnode_t np = VTONFS(vp);
        struct nfsmount *nmp = VTONMP(vp);

-       int error, rv, slpflag, slptimeo, nflags;
+       int error, slpflag, slptimeo, nflags, retry = 0;
+       int ubcflags = UBC_PUSHALL | UBC_SYNC | UBC_INVALIDATE;
+       struct timespec ts = { .tv_sec = 2, .tv_nsec = 0 };

        off_t size;
 
        FSDBG_TOP(554, np, flags, intrflg, 0);
 
        off_t size;
 
        FSDBG_TOP(554, np, flags, intrflg, 0);
 

-       if (nmp && !(nmp->nm_flag & NFSMNT_INT))
+       /*
+        * If the mount is gone no sense to try and write anything.
+        * and hang trying to do IO.
+        */
+       if (nfs_mount_gone(nmp)) {
+               flags &= ~V_SAVE;
+               ubcflags &= ~UBC_PUSHALL;
+       }
+
+       if (nmp && !NMFLAG(nmp, INTR)) {

                intrflg = 0;
                intrflg = 0;

+       }

        if (intrflg) {
                slpflag = PCATCH;
                slptimeo = 2 * hz;
        if (intrflg) {
                slpflag = PCATCH;
                slptimeo = 2 * hz;


@@ -3540,40 +4002,109 @@ nfs_vinvalbuf2(vnode_t vp, int flags, thread_t thd, kauth_cred_t cred, int intrf
        lck_mtx_lock(nfs_buf_mutex);
        while (np->n_bflag & NBINVALINPROG) {
                np->n_bflag |= NBINVALWANT;
        lck_mtx_lock(nfs_buf_mutex);
        while (np->n_bflag & NBINVALINPROG) {
                np->n_bflag |= NBINVALWANT;

-               msleep(&np->n_bflag, nfs_buf_mutex, slpflag, "nfs_vinvalbuf", NULL);
+               msleep(&np->n_bflag, nfs_buf_mutex, slpflag, "nfs_vinvalbuf", &ts);

                if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                        lck_mtx_unlock(nfs_buf_mutex);
                if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {
                        lck_mtx_unlock(nfs_buf_mutex);

-                       return (error);
+                       return error;
+               }
+               if (np->n_bflag & NBINVALINPROG) {
+                       slpflag = 0;

                }
        }
        np->n_bflag |= NBINVALINPROG;
        lck_mtx_unlock(nfs_buf_mutex);
 
        /* Now, flush as required.  */
                }
        }
        np->n_bflag |= NBINVALINPROG;
        lck_mtx_unlock(nfs_buf_mutex);
 
        /* Now, flush as required.  */

+again:

        error = nfs_vinvalbuf_internal(np, flags, thd, cred, slpflag, 0);
        while (error) {
                FSDBG(554, np, 0, 0, error);
        error = nfs_vinvalbuf_internal(np, flags, thd, cred, slpflag, 0);
        while (error) {
                FSDBG(554, np, 0, 0, error);

-               if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0)))
+               if ((error = nfs_sigintr(VTONMP(vp), NULL, thd, 0))) {

                        goto done;
                        goto done;

+               }

                error = nfs_vinvalbuf_internal(np, flags, thd, cred, 0, slptimeo);
        }
 
        /* get the pages out of vm also */
                error = nfs_vinvalbuf_internal(np, flags, thd, cred, 0, slptimeo);
        }
 
        /* get the pages out of vm also */

-       if (UBCINFOEXISTS(vp) && (size = ubc_getsize(vp)))
-               if (!(rv = ubc_sync_range(vp, 0, size, UBC_PUSHALL | UBC_SYNC | UBC_INVALIDATE)))
-                       panic("nfs_vinvalbuf(): ubc_sync_range failed!");
+       if (UBCINFOEXISTS(vp) && (size = ubc_getsize(vp))) {
+               if ((error = ubc_msync(vp, 0, size, NULL, ubcflags))) {
+                       if (error == EINVAL) {
+                               panic("nfs_vinvalbuf(): ubc_msync failed!, error %d", error);
+                       }
+                       if (retry++ < 10) { /* retry invalidating a few times */
+                               if (retry > 1 || error == ENXIO) {
+                                       ubcflags &= ~UBC_PUSHALL;
+                               }
+                               goto again;
+                       }
+                       /* give up */
+                       printf("nfs_vinvalbuf(): ubc_msync failed!, error %d\n", error);
+               }
+       }

 done:
        lck_mtx_lock(nfs_buf_mutex);
        nflags = np->n_bflag;
 done:
        lck_mtx_lock(nfs_buf_mutex);
        nflags = np->n_bflag;

-       np->n_bflag &= ~(NBINVALINPROG|NBINVALWANT);
+       np->n_bflag &= ~(NBINVALINPROG | NBINVALWANT);

        lck_mtx_unlock(nfs_buf_mutex);
        lck_mtx_unlock(nfs_buf_mutex);

-       if (nflags & NBINVALWANT)
+       if (nflags & NBINVALWANT) {

                wakeup(&np->n_bflag);
                wakeup(&np->n_bflag);

+       }

 
        FSDBG_BOT(554, np, flags, intrflg, error);
 
        FSDBG_BOT(554, np, flags, intrflg, error);

-       return (error);
+       return error;
+}
+
+/*
+ * Wait for any busy buffers to complete.
+ */
+void
+nfs_wait_bufs(nfsnode_t np)
+{
+       struct nfsbuf *bp;
+       struct nfsbuflists blist;
+       int error = 0;
+
+       lck_mtx_lock(nfs_buf_mutex);
+       if (!nfs_buf_iterprepare(np, &blist, NBI_CLEAN)) {
+               while ((bp = LIST_FIRST(&blist))) {
+                       LIST_REMOVE(bp, nb_vnbufs);
+                       LIST_INSERT_HEAD(&np->n_cleanblkhd, bp, nb_vnbufs);
+                       nfs_buf_refget(bp);
+                       while ((error = nfs_buf_acquire(bp, 0, 0, 0))) {
+                               if (error != EAGAIN) {
+                                       nfs_buf_refrele(bp);
+                                       nfs_buf_itercomplete(np, &blist, NBI_CLEAN);
+                                       lck_mtx_unlock(nfs_buf_mutex);
+                                       return;
+                               }
+                       }
+                       nfs_buf_refrele(bp);
+                       nfs_buf_drop(bp);
+               }
+               nfs_buf_itercomplete(np, &blist, NBI_CLEAN);
+       }
+       if (!nfs_buf_iterprepare(np, &blist, NBI_DIRTY)) {
+               while ((bp = LIST_FIRST(&blist))) {
+                       LIST_REMOVE(bp, nb_vnbufs);
+                       LIST_INSERT_HEAD(&np->n_dirtyblkhd, bp, nb_vnbufs);
+                       nfs_buf_refget(bp);
+                       while ((error = nfs_buf_acquire(bp, 0, 0, 0))) {
+                               if (error != EAGAIN) {
+                                       nfs_buf_refrele(bp);
+                                       nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
+                                       lck_mtx_unlock(nfs_buf_mutex);
+                                       return;
+                               }
+                       }
+                       nfs_buf_refrele(bp);
+                       nfs_buf_drop(bp);
+               }
+               nfs_buf_itercomplete(np, &blist, NBI_DIRTY);
+       }
+       lck_mtx_unlock(nfs_buf_mutex);

 }
 
 }
 

+

 /*
  * Add an async I/O request to the mount's async I/O queue and make
  * sure that an nfsiod will service it.
 /*
  * Add an async I/O request to the mount's async I/O queue and make
  * sure that an nfsiod will service it.


@@ -3587,8 +4118,12 @@ nfs_asyncio_finish(struct nfsreq *req)
 
        FSDBG_TOP(552, nmp, 0, 0, 0);
 again:
 
        FSDBG_TOP(552, nmp, 0, 0, 0);
 again:

-       if (((nmp = req->r_nmp)) == NULL)
+       nmp = req->r_nmp;
+
+       if (nmp == NULL) {

                return;
                return;

+       }
+

        lck_mtx_lock(nfsiod_mutex);
        niod = nmp->nm_niod;
 
        lck_mtx_lock(nfsiod_mutex);
        niod = nmp->nm_niod;
 


@@ -3607,14 +4142,38 @@ again:
                         */
                        lck_mtx_unlock(nfsiod_mutex);
                        started++;
                         */
                        lck_mtx_unlock(nfsiod_mutex);
                        started++;

-                       if (!nfsiod_start())
+                       if (!nfsiod_start()) {

                                goto again;
                                goto again;

+                       }

                        lck_mtx_lock(nfsiod_mutex);
                }
        }
 
                        lck_mtx_lock(nfsiod_mutex);
                }
        }
 

-       if (req->r_achain.tqe_next == NFSREQNOLIST)
+       /*
+        * If we got here while being on the resendq we need to get off. This
+        * happens when the timer fires and errors out requests from nfs_sigintr
+        * or we receive a reply (UDP case) while being on the resend queue so
+        * we're just finishing up and are not going to be resent.
+        */
+       lck_mtx_lock(&req->r_mtx);
+       if (req->r_flags & R_RESENDQ) {
+               lck_mtx_lock(&nmp->nm_lock);
+               if ((req->r_flags & R_RESENDQ) && req->r_rchain.tqe_next != NFSREQNOLIST) {
+                       NFS_BIO_DBG("Proccessing async request on resendq. Removing");
+                       TAILQ_REMOVE(&nmp->nm_resendq, req, r_rchain);
+                       req->r_flags &= ~R_RESENDQ;
+                       req->r_rchain.tqe_next = NFSREQNOLIST;
+                       assert(req->r_refs > 1);
+                       /* Remove resendq reference */
+                       req->r_refs--;
+               }
+               lck_mtx_unlock(&nmp->nm_lock);
+       }
+       lck_mtx_unlock(&req->r_mtx);
+
+       if (req->r_achain.tqe_next == NFSREQNOLIST) {

                TAILQ_INSERT_TAIL(&nmp->nm_iodq, req, r_achain);
                TAILQ_INSERT_TAIL(&nmp->nm_iodq, req, r_achain);

+       }

 
        /* If this mount doesn't already have an nfsiod working on it... */
        if (!nmp->nm_niod) {
 
        /* If this mount doesn't already have an nfsiod working on it... */
        if (!nmp->nm_niod) {


@@ -3623,8 +4182,10 @@ again:
                        lck_mtx_unlock(nfsiod_mutex);
                        wakeup(niod);
                } else if (nfsiod_thread_count > 0) {
                        lck_mtx_unlock(nfsiod_mutex);
                        wakeup(niod);
                } else if (nfsiod_thread_count > 0) {

-                       /* just queue it up on nfsiod mounts queue */
-                       TAILQ_INSERT_TAIL(&nfsiodmounts, nmp, nm_iodlink);
+                       /* just queue it up on nfsiod mounts queue if needed */
+                       if (nmp->nm_iodlink.tqe_next == NFSNOLIST) {
+                               TAILQ_INSERT_TAIL(&nfsiodmounts, nmp, nm_iodlink);
+                       }

                        lck_mtx_unlock(nfsiod_mutex);
                } else {
                        printf("nfs_asyncio(): no nfsiods? %d %d (%d)\n", nfsiod_thread_count, NFSIOD_MAX, started);
                        lck_mtx_unlock(nfsiod_mutex);
                } else {
                        printf("nfs_asyncio(): no nfsiods? %d %d (%d)\n", nfsiod_thread_count, NFSIOD_MAX, started);


@@ -3642,19 +4203,29 @@ again:
 
 /*
  * queue up async I/O request for resend
 
 /*
  * queue up async I/O request for resend

+ * Must be called with req->r_mtx locked.

  */
 void
 nfs_asyncio_resend(struct nfsreq *req)
 {
        struct nfsmount *nmp = req->r_nmp;
 
  */
 void
 nfs_asyncio_resend(struct nfsreq *req)
 {
        struct nfsmount *nmp = req->r_nmp;
 

-       if (!nmp)
+       if (nfs_mount_gone(nmp)) {

                return;
                return;

+       }
+
+#if CONFIG_NFS_GSS

        nfs_gss_clnt_rpcdone(req);
        nfs_gss_clnt_rpcdone(req);

+#endif

        lck_mtx_lock(&nmp->nm_lock);
        if (!(req->r_flags & R_RESENDQ)) {
                TAILQ_INSERT_TAIL(&nmp->nm_resendq, req, r_rchain);
                req->r_flags |= R_RESENDQ;
        lck_mtx_lock(&nmp->nm_lock);
        if (!(req->r_flags & R_RESENDQ)) {
                TAILQ_INSERT_TAIL(&nmp->nm_resendq, req, r_rchain);
                req->r_flags |= R_RESENDQ;

+               /*
+                * We take a reference on this request so that it can't be
+                * destroyed while a resend is queued or in progress.
+                */
+               nfs_request_ref(req, 1);

        }
        nfs_mount_sock_thread_wake(nmp);
        lck_mtx_unlock(&nmp->nm_lock);
        }
        nfs_mount_sock_thread_wake(nmp);
        lck_mtx_unlock(&nmp->nm_lock);


@@ -3673,17 +4244,23 @@ nfs_buf_readdir(struct nfsbuf *bp, vfs_context_t ctx)
        struct nfsmount *nmp = NFSTONMP(np);
        int error = 0;
 
        struct nfsmount *nmp = NFSTONMP(np);
        int error = 0;
 

-       if (!nmp)
-               return (ENXIO);
+       if (nfs_mount_gone(nmp)) {
+               return ENXIO;
+       }

 
 

-       if (nmp->nm_vers < NFS_VER4)
+       if (nmp->nm_vers < NFS_VER4) {

                error = nfs3_readdir_rpc(np, bp, ctx);
                error = nfs3_readdir_rpc(np, bp, ctx);

-       else
+       }
+#if CONFIG_NFS4
+       else {

                error = nfs4_readdir_rpc(np, bp, ctx);
                error = nfs4_readdir_rpc(np, bp, ctx);

-
+       }
+#endif

        if (error && (error != NFSERR_DIRBUFDROPPED)) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }
        if (error && (error != NFSERR_DIRBUFDROPPED)) {
                SET(bp->nb_flags, NB_ERROR);
                bp->nb_error = error;
        }

-       return (error);
+       return error;

 }
 }

+
+#endif /* CONFIG_NFS_CLIENT */