/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE 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_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
#include <sys/param.h>
+#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc.h>
-#include <sys/mount.h>
-#include <sys/namei.h>
+#include <sys/kauth.h>
+#include <sys/mount_internal.h>
#include <sys/vnode.h>
+#include <sys/ubc.h>
#include <sys/malloc.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
+#include <nfs/nfs_gss.h>
#include <nfs/nfsmount.h>
-#ifdef MALLOC_DEFINE
-static MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part");
-#endif
-
-LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
-u_long nfsnodehash;
+#define NFSNOHASH(fhsum) \
+ (&nfsnodehashtbl[(fhsum) & nfsnodehash])
+static LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl;
+static u_long nfsnodehash;
-#define TRUE 1
-#define FALSE 0
+static lck_grp_t *nfs_node_hash_lck_grp;
+static lck_grp_t *nfs_node_lck_grp;
+static lck_grp_t *nfs_data_lck_grp;
+lck_mtx_t *nfs_node_hash_mutex;
/*
* Initialize hash links for nfsnodes
* and build nfsnode free list.
*/
void
-nfs_nhinit()
+nfs_nhinit(void)
+{
+ nfs_node_hash_lck_grp = lck_grp_alloc_init("nfs_node_hash", LCK_GRP_ATTR_NULL);
+ nfs_node_hash_mutex = lck_mtx_alloc_init(nfs_node_hash_lck_grp, LCK_ATTR_NULL);
+ nfs_node_lck_grp = lck_grp_alloc_init("nfs_node", LCK_GRP_ATTR_NULL);
+ nfs_data_lck_grp = lck_grp_alloc_init("nfs_data", LCK_GRP_ATTR_NULL);
+}
+
+void
+nfs_nhinit_finish(void)
{
- nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
+ lck_mtx_lock(nfs_node_hash_mutex);
+ if (!nfsnodehashtbl)
+ nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, &nfsnodehash);
+ lck_mtx_unlock(nfs_node_hash_mutex);
}
/*
* Compute an entry in the NFS hash table structure
*/
u_long
-nfs_hash(fhp, fhsize)
- register nfsfh_t *fhp;
- int fhsize;
+nfs_hash(u_char *fhp, int fhsize)
{
- register u_char *fhpp;
- register u_long fhsum;
- register int i;
+ u_long fhsum;
+ int i;
- fhpp = &fhp->fh_bytes[0];
fhsum = 0;
for (i = 0; i < fhsize; i++)
- fhsum += *fhpp++;
+ fhsum += *fhp++;
return (fhsum);
}
* In all cases, a pointer to a
* nfsnode structure is returned.
*/
-int nfs_node_hash_lock;
-
int
-nfs_nget(mntp, fhp, fhsize, npp)
- struct mount *mntp;
- register nfsfh_t *fhp;
- int fhsize;
- struct nfsnode **npp;
+nfs_nget(
+ mount_t mp,
+ nfsnode_t dnp,
+ struct componentname *cnp,
+ u_char *fhp,
+ int fhsize,
+ struct nfs_vattr *nvap,
+ u_int64_t *xidp,
+ int flags,
+ nfsnode_t *npp)
{
- struct proc *p = current_proc(); /* XXX */
- struct nfsnode *np;
+ nfsnode_t np;
struct nfsnodehashhead *nhpp;
- register struct vnode *vp;
- struct vnode *nvp;
- int error;
+ vnode_t vp;
+ int error, nfsvers;
+ mount_t mp2;
+ struct vnode_fsparam vfsp;
+ uint32_t vid;
+
+ FSDBG_TOP(263, mp, dnp, flags, npp);
/* Check for unmount in progress */
- if (mntp->mnt_kern_flag & MNTK_UNMOUNT) {
- *npp = 0;
- return (EPERM);
+ if (!mp || (mp->mnt_kern_flag & MNTK_FRCUNMOUNT)) {
+ *npp = NULL;
+ error = ENXIO;
+ FSDBG_BOT(263, mp, dnp, 0xd1e, error);
+ return (error);
}
+ nfsvers = VFSTONFS(mp)->nm_vers;
nhpp = NFSNOHASH(nfs_hash(fhp, fhsize));
loop:
+ lck_mtx_lock(nfs_node_hash_mutex);
for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) {
- if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
- bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize))
+ mp2 = (np->n_hflag & NHINIT) ? np->n_mount : NFSTOMP(np);
+ if (mp != mp2 || np->n_fhsize != fhsize ||
+ bcmp(fhp, np->n_fhp, fhsize))
continue;
+ FSDBG(263, dnp, np, np->n_flag, 0xcace0000);
+ /* if the node is locked, sleep on it */
+ if ((np->n_hflag & NHLOCKED) && !(flags & NG_NOCREATE)) {
+ np->n_hflag |= NHLOCKWANT;
+ FSDBG(263, dnp, np, np->n_flag, 0xcace2222);
+ msleep(np, nfs_node_hash_mutex, PDROP | PINOD, "nfs_nget", NULL);
+ FSDBG(263, dnp, np, np->n_flag, 0xcace3333);
+ goto loop;
+ }
vp = NFSTOV(np);
- if (vget(vp, LK_EXCLUSIVE, p))
+ vid = vnode_vid(vp);
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ if ((error = vnode_getwithvid(vp, vid))) {
+ /*
+ * If vnode is being reclaimed or has already
+ * changed identity, no need to wait.
+ */
+ FSDBG_BOT(263, dnp, *npp, 0xcace0d1e, error);
+ return (error);
+ }
+ if ((error = nfs_node_lock(np))) {
+ /* this only fails if the node is now unhashed */
+ /* so let's see if we can find/create it again */
+ FSDBG(263, dnp, *npp, 0xcaced1e2, error);
+ vnode_put(vp);
+ if (flags & NG_NOCREATE) {
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0xcaced1e0, ENOENT);
+ return (ENOENT);
+ }
goto loop;
- *npp = np;
- return(0);
+ }
+ /* update attributes */
+ if (nvap)
+ error = nfs_loadattrcache(np, nvap, xidp, 0);
+ if (error) {
+ nfs_node_unlock(np);
+ vnode_put(vp);
+ } else {
+ if (dnp && cnp && (flags & NG_MAKEENTRY))
+ cache_enter(NFSTOV(dnp), vp, cnp);
+ *npp = np;
+ }
+ FSDBG_BOT(263, dnp, *npp, 0xcace0000, error);
+ return(error);
+ }
+
+ FSDBG(263, mp, dnp, npp, 0xaaaaaaaa);
+
+ if (flags & NG_NOCREATE) {
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000001, ENOENT);
+ return (ENOENT);
}
+
/*
- * Obtain a lock to prevent a race condition if the getnewvnode()
- * or MALLOC() below happens to block.
+ * allocate and initialize nfsnode and stick it in the hash
+ * before calling getnewvnode(). Anyone finding it in the
+ * hash before initialization is complete will wait for it.
*/
- if (nfs_node_hash_lock) {
- while (nfs_node_hash_lock) {
- nfs_node_hash_lock = -1;
- tsleep(&nfs_node_hash_lock, PVM, "nfsngt", 0);
+ MALLOC_ZONE(np, nfsnode_t, sizeof *np, M_NFSNODE, M_WAITOK);
+ if (!np) {
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000001, ENOMEM);
+ return (ENOMEM);
+ }
+ bzero(np, sizeof *np);
+ np->n_hflag |= (NHINIT | NHLOCKED);
+ np->n_mount = mp;
+ TAILQ_INIT(&np->n_opens);
+ TAILQ_INIT(&np->n_lock_owners);
+ TAILQ_INIT(&np->n_locks);
+ np->n_dlink.tqe_next = NFSNOLIST;
+
+ if (dnp && cnp && ((cnp->cn_namelen != 2) ||
+ (cnp->cn_nameptr[0] != '.') || (cnp->cn_nameptr[1] != '.'))) {
+ vnode_t dvp = NFSTOV(dnp);
+ if (!vnode_get(dvp)) {
+ if (!vnode_ref(dvp))
+ np->n_parent = dvp;
+ vnode_put(dvp);
}
- goto loop;
}
- nfs_node_hash_lock = 1;
- /*
- * Do the MALLOC before the getnewvnode since doing so afterward
- * might cause a bogus v_data pointer to get dereferenced
- * elsewhere if MALLOC should block.
- */
- MALLOC_ZONE(np, struct nfsnode *, sizeof *np, M_NFSNODE, M_WAITOK);
-
- error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp);
+ /* setup node's file handle */
+ if (fhsize > NFS_SMALLFH) {
+ MALLOC_ZONE(np->n_fhp, u_char *,
+ fhsize, M_NFSBIGFH, M_WAITOK);
+ if (!np->n_fhp) {
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ FREE_ZONE(np, sizeof *np, M_NFSNODE);
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000002, ENOMEM);
+ return (ENOMEM);
+ }
+ } else {
+ np->n_fhp = &np->n_fh[0];
+ }
+ bcopy(fhp, np->n_fhp, fhsize);
+ np->n_fhsize = fhsize;
+
+ /* Insert the nfsnode in the hash queue for its new file handle */
+ LIST_INSERT_HEAD(nhpp, np, n_hash);
+ np->n_hflag |= NHHASHED;
+ FSDBG(266, 0, np, np->n_flag, np->n_hflag);
+
+ /* lock the new nfsnode */
+ lck_mtx_init(&np->n_lock, nfs_node_lck_grp, LCK_ATTR_NULL);
+ lck_rw_init(&np->n_datalock, nfs_data_lck_grp, LCK_ATTR_NULL);
+ lck_mtx_init(&np->n_openlock, nfs_open_grp, LCK_ATTR_NULL);
+ lck_mtx_lock(&np->n_lock);
+
+ /* release lock on hash table */
+ lck_mtx_unlock(nfs_node_hash_mutex);
+
+ /* do initial loading of attributes */
+ error = nfs_loadattrcache(np, nvap, xidp, 1);
if (error) {
- if (nfs_node_hash_lock < 0)
- wakeup(&nfs_node_hash_lock);
- nfs_node_hash_lock = 0;
+ FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
+ nfs_node_unlock(np);
+ lck_mtx_lock(nfs_node_hash_mutex);
+ LIST_REMOVE(np, n_hash);
+ np->n_hflag &= ~(NHHASHED|NHINIT|NHLOCKED);
+ if (np->n_hflag & NHLOCKWANT) {
+ np->n_hflag &= ~NHLOCKWANT;
+ wakeup(np);
+ }
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ if (np->n_parent) {
+ if (!vnode_get(np->n_parent)) {
+ vnode_rele(np->n_parent);
+ vnode_put(np->n_parent);
+ }
+ np->n_parent = NULL;
+ }
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
+ if (np->n_fhsize > NFS_SMALLFH)
+ FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
+ FREE_ZONE(np, sizeof *np, M_NFSNODE);
*npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000003, error);
+ return (error);
+ }
+ NFS_CHANGED_UPDATE(nfsvers, np, nvap);
+ if (nvap->nva_type == VDIR)
+ NFS_CHANGED_UPDATE_NC(nfsvers, np, nvap);
+ NMODEINVALIDATE(np);
+
+ /* now, attempt to get a new vnode */
+ vfsp.vnfs_mp = mp;
+ vfsp.vnfs_vtype = nvap->nva_type;
+ vfsp.vnfs_str = "nfs";
+ vfsp.vnfs_dvp = dnp ? NFSTOV(dnp) : NULL;
+ vfsp.vnfs_fsnode = np;
+ if (nfsvers == NFS_VER4) {
+#if FIFO
+ if (nvap->nva_type == VFIFO)
+ vfsp.vnfs_vops = fifo_nfsv4nodeop_p;
+ else
+#endif /* FIFO */
+ if (nvap->nva_type == VBLK || nvap->nva_type == VCHR)
+ vfsp.vnfs_vops = spec_nfsv4nodeop_p;
+ else
+ vfsp.vnfs_vops = nfsv4_vnodeop_p;
+ } else {
+#if FIFO
+ if (nvap->nva_type == VFIFO)
+ vfsp.vnfs_vops = fifo_nfsv2nodeop_p;
+ else
+#endif /* FIFO */
+ if (nvap->nva_type == VBLK || nvap->nva_type == VCHR)
+ vfsp.vnfs_vops = spec_nfsv2nodeop_p;
+ else
+ vfsp.vnfs_vops = nfsv2_vnodeop_p;
+ }
+ vfsp.vnfs_markroot = (flags & NG_MARKROOT) ? 1 : 0;
+ vfsp.vnfs_marksystem = 0;
+ vfsp.vnfs_rdev = 0;
+ vfsp.vnfs_filesize = nvap->nva_size;
+ vfsp.vnfs_cnp = cnp;
+ vfsp.vnfs_flags = VNFS_ADDFSREF;
+ if (!dnp || !cnp || !(flags & NG_MAKEENTRY))
+ vfsp.vnfs_flags |= VNFS_NOCACHE;
+
+ error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, &np->n_vnode);
+ if (error) {
+ FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
+ nfs_node_unlock(np);
+ lck_mtx_lock(nfs_node_hash_mutex);
+ LIST_REMOVE(np, n_hash);
+ np->n_hflag &= ~(NHHASHED|NHINIT|NHLOCKED);
+ if (np->n_hflag & NHLOCKWANT) {
+ np->n_hflag &= ~NHLOCKWANT;
+ wakeup(np);
+ }
+ lck_mtx_unlock(nfs_node_hash_mutex);
+ if (np->n_parent) {
+ if (!vnode_get(np->n_parent)) {
+ vnode_rele(np->n_parent);
+ vnode_put(np->n_parent);
+ }
+ np->n_parent = NULL;
+ }
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
+ if (np->n_fhsize > NFS_SMALLFH)
+ FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
FREE_ZONE(np, sizeof *np, M_NFSNODE);
+ *npp = 0;
+ FSDBG_BOT(263, dnp, *npp, 0x80000004, error);
return (error);
}
- vp = nvp;
- bzero((caddr_t)np, sizeof *np);
- vp->v_data = np;
- np->n_vnode = vp;
- /*
- * Insert the nfsnode in the hash queue for its new file handle
- */
- LIST_INSERT_HEAD(nhpp, np, n_hash);
- if (fhsize > NFS_SMALLFH) {
- MALLOC_ZONE(np->n_fhp, nfsfh_t *,
- fhsize, M_NFSBIGFH, M_WAITOK);
- } else
- np->n_fhp = &np->n_fh;
- bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
- np->n_fhsize = fhsize;
- *npp = np;
+ vp = np->n_vnode;
+ vnode_settag(vp, VT_NFS);
+ /* node is now initialized */
- if (nfs_node_hash_lock < 0)
- wakeup(&nfs_node_hash_lock);
- nfs_node_hash_lock = 0;
+ /* check if anyone's waiting on this node */
+ lck_mtx_lock(nfs_node_hash_mutex);
+ np->n_hflag &= ~(NHINIT|NHLOCKED);
+ if (np->n_hflag & NHLOCKWANT) {
+ np->n_hflag &= ~NHLOCKWANT;
+ wakeup(np);
+ }
+ lck_mtx_unlock(nfs_node_hash_mutex);
- /*
- * Lock the new nfsnode.
- */
- vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+ *npp = np;
- return (0);
+ FSDBG_BOT(263, dnp, vp, *npp, error);
+ return (error);
}
+
int
-nfs_inactive(ap)
- struct vop_inactive_args /* {
- struct vnode *a_vp;
- struct proc *a_p;
+nfs_vnop_inactive(ap)
+ struct vnop_inactive_args /* {
+ struct vnodeop_desc *a_desc;
+ vnode_t a_vp;
+ vfs_context_t a_context;
} */ *ap;
{
- register struct nfsnode *np;
- register struct sillyrename *sp;
- struct proc *p = current_proc(); /* XXX */
- extern int prtactive;
- struct ucred *cred;
-
- np = VTONFS(ap->a_vp);
- if (prtactive && ap->a_vp->v_usecount != 0)
- vprint("nfs_inactive: pushing active", ap->a_vp);
- if (ap->a_vp->v_type != VDIR) {
- sp = np->n_sillyrename;
- np->n_sillyrename = (struct sillyrename *)0;
- } else
- sp = (struct sillyrename *)0;
-
- if (sp) {
+ vnode_t vp = ap->a_vp;
+ vfs_context_t ctx = ap->a_context;
+ nfsnode_t np = VTONFS(ap->a_vp);
+ struct nfs_sillyrename *nsp;
+ struct nfs_vattr nvattr;
+ int unhash, attrerr, busyerror, error, inuse, busied;
+ struct nfs_open_file *nofp;
+ const char *vname = NULL;
+ struct componentname cn;
+ struct nfsmount *nmp = NFSTONMP(np);
+
+restart:
+ error = 0;
+ inuse = ((nmp->nm_vers >= NFS_VER4) && (nfs_mount_state_in_use_start(nmp) == 0));
+
+ /* There shouldn't be any open or lock state at this point */
+ lck_mtx_lock(&np->n_openlock);
+ if (np->n_openrefcnt) {
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: still open: %d %s\n", np->n_openrefcnt, vname ? vname : "//");
+ }
+ TAILQ_FOREACH(nofp, &np->n_opens, nof_link) {
+ lck_mtx_lock(&nofp->nof_lock);
+ if (nofp->nof_flags & NFS_OPEN_FILE_BUSY) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: open file busy: %s\n", vname ? vname : "//");
+ busied = 0;
+ } else {
+ nofp->nof_flags |= NFS_OPEN_FILE_BUSY;
+ busied = 1;
+ }
+ lck_mtx_unlock(&nofp->nof_lock);
/*
- * Remove the silly file that was rename'd earlier
+ * If we just created the file, we already had it open in
+ * anticipation of getting a subsequent open call. If the
+ * node has gone inactive without being open, we need to
+ * clean up (close) the open done in the create.
*/
-#if DIAGNOSTIC
- kprintf("nfs_inactive removing %s, dvp=%x, a_vp=%x, ap=%x, np=%x, sp=%x\n", &sp->s_name[0], (unsigned)sp->s_dvp, (unsigned)ap->a_vp, (unsigned)ap, (unsigned)np, (unsigned)sp);
-#endif
+ if ((nofp->nof_flags & NFS_OPEN_FILE_CREATE) && nofp->nof_creator) {
+ if (nofp->nof_flags & NFS_OPEN_FILE_REOPEN) {
+ lck_mtx_unlock(&np->n_openlock);
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, 0);
+ nfs4_reopen(nofp, vfs_context_thread(ctx));
+ goto restart;
+ }
+ nofp->nof_flags &= ~NFS_OPEN_FILE_CREATE;
+ lck_mtx_unlock(&np->n_openlock);
+ error = nfs4_close(np, nofp, NFS_OPEN_SHARE_ACCESS_BOTH, NFS_OPEN_SHARE_DENY_NONE, ctx);
+ if (error) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: create close error: %d, %s\n", error, vname);
+ nofp->nof_flags |= NFS_OPEN_FILE_CREATE;
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, error);
+ goto restart;
+ }
+ if (nofp->nof_flags & NFS_OPEN_FILE_NEEDCLOSE) {
+ /*
+ * If the file is marked as needing reopen, but this was the only
+ * open on the file, just drop the open.
+ */
+ nofp->nof_flags &= ~NFS_OPEN_FILE_NEEDCLOSE;
+ if ((nofp->nof_flags & NFS_OPEN_FILE_REOPEN) && (nofp->nof_opencnt == 1)) {
+ nofp->nof_flags &= ~NFS_OPEN_FILE_REOPEN;
+ nofp->nof_r--;
+ nofp->nof_opencnt--;
+ nofp->nof_access = 0;
+ } else {
+ lck_mtx_unlock(&np->n_openlock);
+ if (nofp->nof_flags & NFS_OPEN_FILE_REOPEN) {
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, 0);
+ nfs4_reopen(nofp, vfs_context_thread(ctx));
+ goto restart;
+ }
+ error = nfs4_close(np, nofp, NFS_OPEN_SHARE_ACCESS_READ, NFS_OPEN_SHARE_DENY_NONE, ctx);
+ if (error) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: need close error: %d, %s\n", error, vname);
+ nofp->nof_flags |= NFS_OPEN_FILE_NEEDCLOSE;
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ if (inuse)
+ nfs_mount_state_in_use_end(nmp, error);
+ goto restart;
+ }
+ }
+ if (nofp->nof_opencnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: file still open: %d %s\n", nofp->nof_opencnt, vname ? vname : "//");
+ }
+ if (nofp->nof_access || nofp->nof_deny ||
+ nofp->nof_mmap_access || nofp->nof_mmap_deny ||
+ nofp->nof_r || nofp->nof_w || nofp->nof_rw ||
+ nofp->nof_r_dw || nofp->nof_w_dw || nofp->nof_rw_dw ||
+ nofp->nof_r_drw || nofp->nof_w_drw || nofp->nof_rw_drw) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_inactive: non-zero access: %d %d %d %d # %u %u %u dw %u %u %u drw %u %u %u %s\n",
+ nofp->nof_access, nofp->nof_deny,
+ nofp->nof_mmap_access, nofp->nof_mmap_deny,
+ nofp->nof_r, nofp->nof_w, nofp->nof_rw,
+ nofp->nof_r_dw, nofp->nof_w_dw, nofp->nof_rw_dw,
+ nofp->nof_r_drw, nofp->nof_w_drw, nofp->nof_rw_drw,
+ vname ? vname : "//");
+ }
+ if (busied)
+ nfs_open_file_clear_busy(nofp);
+ }
+ lck_mtx_unlock(&np->n_openlock);
+ if (vname)
+ vnode_putname(vname);
+
+ if (inuse && nfs_mount_state_in_use_end(nmp, error))
+ goto restart;
+
+ nfs_node_lock_force(np);
+
+ if (vnode_vtype(vp) != VDIR) {
+ nsp = np->n_sillyrename;
+ np->n_sillyrename = NULL;
+ } else {
+ nsp = NULL;
+ }
+
+ FSDBG_TOP(264, vp, np, np->n_flag, nsp);
+
+ if (!nsp) {
+ /* no silly file to clean up... */
+ /* clear all flags other than these */
+ np->n_flag &= (NMODIFIED);
+ nfs_node_unlock(np);
+ FSDBG_BOT(264, vp, np, np->n_flag, 0);
+ return (0);
+ }
+ nfs_node_unlock(np);
+
+ /* Remove the silly file that was rename'd earlier */
+
+ /* flush all the buffers */
+ nfs_vinvalbuf2(vp, V_SAVE, vfs_context_thread(ctx), nsp->nsr_cred, 1);
+
+ /* try to get the latest attributes */
+ attrerr = nfs_getattr(np, &nvattr, ctx, NGA_UNCACHED);
+
+ /* Check if we should remove it from the node hash. */
+ /* Leave it if inuse or it has multiple hard links. */
+ if (vnode_isinuse(vp, 0) || (!attrerr && (nvattr.nva_nlink > 1))) {
+ unhash = 0;
+ } else {
+ unhash = 1;
+ ubc_setsize(vp, 0);
+ }
+
+ /* mark this node and the directory busy while we do the remove */
+ busyerror = nfs_node_set_busy2(nsp->nsr_dnp, np, vfs_context_thread(ctx));
+
+ /* lock the node while we remove the silly file */
+ lck_mtx_lock(nfs_node_hash_mutex);
+ while (np->n_hflag & NHLOCKED) {
+ np->n_hflag |= NHLOCKWANT;
+ msleep(np, nfs_node_hash_mutex, PINOD, "nfs_inactive", NULL);
+ }
+ np->n_hflag |= NHLOCKED;
+ lck_mtx_unlock(nfs_node_hash_mutex);
+
+ /* purge the name cache to deter others from finding it */
+ bzero(&cn, sizeof(cn));
+ cn.cn_nameptr = nsp->nsr_name;
+ cn.cn_namelen = nsp->nsr_namlen;
+ nfs_name_cache_purge(nsp->nsr_dnp, np, &cn, ctx);
+
+ FSDBG(264, np, np->n_size, np->n_vattr.nva_size, 0xf00d00f1);
+
+ /* now remove the silly file */
+ nfs_removeit(nsp);
+
+ /* clear all flags other than these */
+ nfs_node_lock_force(np);
+ np->n_flag &= (NMODIFIED);
+ nfs_node_unlock(np);
+
+ if (!busyerror)
+ nfs_node_clear_busy2(nsp->nsr_dnp, np);
+
+ if (unhash && vnode_isinuse(vp, 0)) {
+ /* vnode now inuse after silly remove? */
+ unhash = 0;
+ ubc_setsize(vp, np->n_size);
+ }
+
+ lck_mtx_lock(nfs_node_hash_mutex);
+ if (unhash) {
/*
- * We get a reference (vget) to ensure getnewvnode()
- * doesn't recycle vp while we're asleep awaiting I/O.
- * Note we don't need the reference unless usecount is
- * already zero. In the case of a forcible unmount it
- * wont be zero and doing a vget would fail because
- * vclean holds VXLOCK.
+ * remove nfsnode from hash now so we can't accidentally find it
+ * again if another object gets created with the same filehandle
+ * before this vnode gets reclaimed
*/
- if (ap->a_vp->v_usecount > 0) {
- VREF(ap->a_vp);
- } else if (vget(ap->a_vp, 0, ap->a_p))
- panic("nfs_inactive: vget failed");
- (void) nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p, 1);
- ubc_setsize(ap->a_vp, (off_t)0);
-
- /* We have a problem. The dvp could have gone away on us
- * while in the unmount path. Thus it appears as VBAD and we
- * cannot use it. If we tried locking the parent (future), for silly
- * rename files, it is unclear where we would lock. The unmount
- * code just pulls unlocked vnodes as it goes thru its list and
- * yanks them. Could unmount be smarter to see if a busy reg vnode has
- * a parent, and not yank it yet? Put in more passes at unmount
- * time? In the meantime, just check if it went away on us. Could
- * have gone away during the nfs_vinvalbuf or ubc_setsize which block.
- * Or perhaps even before nfs_inactive got called.
- */
- if ((sp->s_dvp)->v_type != VBAD)
- nfs_removeit(sp); /* uses the dvp */
- cred = sp->s_cred;
- if (cred != NOCRED) {
- sp->s_cred = NOCRED;
- crfree(cred);
+ if (np->n_hflag & NHHASHED) {
+ LIST_REMOVE(np, n_hash);
+ np->n_hflag &= ~NHHASHED;
+ FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
}
- vrele(sp->s_dvp);
- FREE_ZONE((caddr_t)sp, sizeof (struct sillyrename), M_NFSREQ);
- vrele(ap->a_vp);
+ vnode_recycle(vp);
+ }
+ /* unlock the node */
+ np->n_hflag &= ~NHLOCKED;
+ if (np->n_hflag & NHLOCKWANT) {
+ np->n_hflag &= ~NHLOCKWANT;
+ wakeup(np);
}
- np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
- NQNFSNONCACHE | NQNFSWRITE);
- VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
+ lck_mtx_unlock(nfs_node_hash_mutex);
+
+ /* cleanup sillyrename info */
+ if (nsp->nsr_cred != NOCRED)
+ kauth_cred_unref(&nsp->nsr_cred);
+ vnode_rele(NFSTOV(nsp->nsr_dnp));
+ FREE_ZONE(nsp, sizeof(*nsp), M_NFSREQ);
+
+ FSDBG_BOT(264, vp, np, np->n_flag, 0);
return (0);
}
* Reclaim an nfsnode so that it can be used for other purposes.
*/
int
-nfs_reclaim(ap)
- struct vop_reclaim_args /* {
- struct vnode *a_vp;
+nfs_vnop_reclaim(ap)
+ struct vnop_reclaim_args /* {
+ struct vnodeop_desc *a_desc;
+ vnode_t a_vp;
+ vfs_context_t a_context;
} */ *ap;
{
- register struct vnode *vp = ap->a_vp;
- register struct nfsnode *np = VTONFS(vp);
- register struct nfsmount *nmp = VFSTONFS(vp->v_mount);
- register struct nfsdmap *dp, *dp2;
- extern int prtactive;
+ vnode_t vp = ap->a_vp;
+ nfsnode_t np = VTONFS(vp);
+ vfs_context_t ctx = ap->a_context;
+ struct nfs_open_file *nofp, *nextnofp;
+ struct nfs_file_lock *nflp, *nextnflp;
+ struct nfs_lock_owner *nlop, *nextnlop;
+ const char *vname = NULL;
+ struct nfsmount *nmp = np->n_mount ? VFSTONFS(np->n_mount) : NFSTONMP(np);
- if (prtactive && vp->v_usecount != 0)
- vprint("nfs_reclaim: pushing active", vp);
+ FSDBG_TOP(265, vp, np, np->n_flag, 0);
- LIST_REMOVE(np, n_hash);
+ /* There shouldn't be any open or lock state at this point */
+ lck_mtx_lock(&np->n_openlock);
- /*
- * In case we block during FREE_ZONEs below, get the entry out
- * of tbe name cache now so subsequent lookups won't find it.
- */
- cache_purge(vp);
-
- /*
- * For nqnfs, take it off the timer queue as required.
- */
- if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_timer.cqe_next != 0) {
- CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
+ if (nmp && (nmp->nm_vers >= NFS_VER4)) {
+ /* need to drop a delegation */
+ if (np->n_dlink.tqe_next != NFSNOLIST) {
+ /* remove this node from the recall list */
+ lck_mtx_lock(&nmp->nm_lock);
+ if (np->n_dlink.tqe_next != NFSNOLIST) {
+ TAILQ_REMOVE(&nmp->nm_recallq, np, n_dlink);
+ np->n_dlink.tqe_next = NFSNOLIST;
+ }
+ lck_mtx_unlock(&nmp->nm_lock);
+ }
+ if (np->n_openflags & N_DELEG_MASK) {
+ np->n_openflags &= ~N_DELEG_MASK;
+ nfs4_delegreturn_rpc(nmp, np->n_fhp, np->n_fhsize, &np->n_dstateid,
+ vfs_context_thread(ctx), vfs_context_ucred(ctx));
+ }
}
- /*
- * Free up any directory cookie structures and
- * large file handle structures that might be associated with
- * this nfs node.
- */
- if (vp->v_type == VDIR) {
- dp = np->n_cookies.lh_first;
- while (dp) {
- dp2 = dp;
- dp = dp->ndm_list.le_next;
- FREE_ZONE((caddr_t)dp2,
- sizeof (struct nfsdmap), M_NFSDIROFF);
+ /* clean up file locks */
+ TAILQ_FOREACH_SAFE(nflp, &np->n_locks, nfl_link, nextnflp) {
+ if (!(nflp->nfl_flags & NFS_FILE_LOCK_DEAD)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: lock 0x%llx 0x%llx 0x%x (bc %d) %s\n",
+ nflp->nfl_start, nflp->nfl_end, nflp->nfl_flags,
+ nflp->nfl_blockcnt, vname ? vname : "//");
+ }
+ if (!(nflp->nfl_flags & NFS_FILE_LOCK_BLOCKED)) {
+ lck_mtx_lock(&nflp->nfl_owner->nlo_lock);
+ TAILQ_REMOVE(&nflp->nfl_owner->nlo_locks, nflp, nfl_lolink);
+ lck_mtx_unlock(&nflp->nfl_owner->nlo_lock);
+ }
+ TAILQ_REMOVE(&np->n_locks, nflp, nfl_link);
+ nfs_file_lock_destroy(nflp);
+ }
+ /* clean up lock owners */
+ TAILQ_FOREACH_SAFE(nlop, &np->n_lock_owners, nlo_link, nextnlop) {
+ if (!TAILQ_EMPTY(&nlop->nlo_locks)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: lock owner with locks %s\n",
+ vname ? vname : "//");
}
+ TAILQ_REMOVE(&np->n_lock_owners, nlop, nlo_link);
+ nfs_lock_owner_destroy(nlop);
}
- if (np->n_fhsize > NFS_SMALLFH) {
- FREE_ZONE((caddr_t)np->n_fhp, np->n_fhsize, M_NFSBIGFH);
+ /* clean up open state */
+ if (np->n_openrefcnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: still open: %d %s\n",
+ np->n_openrefcnt, vname ? vname : "//");
}
+ TAILQ_FOREACH_SAFE(nofp, &np->n_opens, nof_link, nextnofp) {
+ if (nofp->nof_flags & NFS_OPEN_FILE_BUSY) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: open file busy: %s\n",
+ vname ? vname : "//");
+ }
+ if (nofp->nof_opencnt) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: file still open: %d %s\n",
+ nofp->nof_opencnt, vname ? vname : "//");
+ }
+ if (nofp->nof_access || nofp->nof_deny ||
+ nofp->nof_mmap_access || nofp->nof_mmap_deny ||
+ nofp->nof_r || nofp->nof_w || nofp->nof_rw ||
+ nofp->nof_r_dw || nofp->nof_w_dw || nofp->nof_rw_dw ||
+ nofp->nof_r_drw || nofp->nof_w_drw || nofp->nof_rw_drw) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_vnop_reclaim: non-zero access: %d %d %d %d # %u %u %u dw %u %u %u drw %u %u %u %s\n",
+ nofp->nof_access, nofp->nof_deny,
+ nofp->nof_mmap_access, nofp->nof_mmap_deny,
+ nofp->nof_r, nofp->nof_w, nofp->nof_rw,
+ nofp->nof_r_dw, nofp->nof_w_dw, nofp->nof_rw_dw,
+ nofp->nof_r_drw, nofp->nof_w_drw, nofp->nof_rw_drw,
+ vname ? vname : "//");
+ }
+ TAILQ_REMOVE(&np->n_opens, nofp, nof_link);
+ nfs_open_file_destroy(nofp);
+ }
+ lck_mtx_unlock(&np->n_openlock);
- FREE_ZONE(vp->v_data, sizeof (struct nfsnode), M_NFSNODE);
- vp->v_data = (void *)0;
- return (0);
-}
+ lck_mtx_lock(nfs_buf_mutex);
+ if (!LIST_EMPTY(&np->n_dirtyblkhd) || !LIST_EMPTY(&np->n_cleanblkhd)) {
+ if (!vname)
+ vname = vnode_getname(vp);
+ printf("nfs_reclaim: dropping %s buffers for file %s\n",
+ (!LIST_EMPTY(&np->n_dirtyblkhd) ? "dirty" : "clean"),
+ (vname ? vname : "//"));
+ }
+ lck_mtx_unlock(nfs_buf_mutex);
+ if (vname)
+ vnode_putname(vname);
+ nfs_vinvalbuf(vp, V_IGNORE_WRITEERR, ap->a_context, 0);
-#if 0
-/*
- * Lock an nfsnode
- */
-int
-nfs_lock(ap)
- struct vop_lock_args /* {
- struct vnode *a_vp;
- } */ *ap;
-{
- register struct vnode *vp = ap->a_vp;
+ lck_mtx_lock(nfs_node_hash_mutex);
- /*
- * Ugh, another place where interruptible mounts will get hung.
- * If you make this sleep interruptible, then you have to fix all
- * the VOP_LOCK() calls to expect interruptibility.
- */
- while (vp->v_flag & VXLOCK) {
- vp->v_flag |= VXWANT;
- (void) tsleep((caddr_t)vp, PINOD, "nfslck", 0);
+ if ((vnode_vtype(vp) != VDIR) && np->n_sillyrename) {
+ printf("nfs_reclaim: leaving unlinked file %s\n", np->n_sillyrename->nsr_name);
+ if (np->n_sillyrename->nsr_cred != NOCRED)
+ kauth_cred_unref(&np->n_sillyrename->nsr_cred);
+ vnode_rele(NFSTOV(np->n_sillyrename->nsr_dnp));
+ FREE_ZONE(np->n_sillyrename, sizeof(*np->n_sillyrename), M_NFSREQ);
}
- if (vp->v_tag == VT_NON)
- return (ENOENT);
-#if 0
+ vnode_removefsref(vp);
+
+ if (np->n_hflag & NHHASHED) {
+ LIST_REMOVE(np, n_hash);
+ np->n_hflag &= ~NHHASHED;
+ FSDBG(266, 0, np, np->n_flag, 0xb1eb1e);
+ }
+ lck_mtx_unlock(nfs_node_hash_mutex);
+
/*
- * Only lock regular files. If a server crashed while we were
- * holding a directory lock, we could easily end up sleeping
- * until the server rebooted while holding a lock on the root.
- * Locks are only needed for protecting critical sections in
- * VMIO at the moment.
- * New vnodes will have type VNON but they should be locked
- * since they may become VREG. This is checked in loadattrcache
- * and unwanted locks are released there.
+ * Free up any directory cookie structures and large file handle
+ * structures that might be associated with this nfs node.
*/
- if (vp->v_type == VREG || vp->v_type == VNON) {
- while (np->n_flag & NLOCKED) {
- np->n_flag |= NWANTED;
- (void) tsleep((caddr_t) np, PINOD, "nfslck2", 0);
- /*
- * If the vnode has transmuted into a VDIR while we
- * were asleep, then skip the lock.
- */
- if (vp->v_type != VREG && vp->v_type != VNON)
- return (0);
+ nfs_node_lock_force(np);
+ if ((vnode_vtype(vp) == VDIR) && np->n_cookiecache)
+ FREE_ZONE(np->n_cookiecache, sizeof(struct nfsdmap), M_NFSDIROFF);
+ if (np->n_fhsize > NFS_SMALLFH)
+ FREE_ZONE(np->n_fhp, np->n_fhsize, M_NFSBIGFH);
+ nfs_node_unlock(np);
+ vnode_clearfsnode(vp);
+
+ if (np->n_parent) {
+ if (!vnode_get(np->n_parent)) {
+ vnode_rele(np->n_parent);
+ vnode_put(np->n_parent);
}
- np->n_flag |= NLOCKED;
+ np->n_parent = NULL;
}
-#endif
+ lck_mtx_destroy(&np->n_lock, nfs_node_lck_grp);
+ lck_rw_destroy(&np->n_datalock, nfs_data_lck_grp);
+ lck_mtx_destroy(&np->n_openlock, nfs_open_grp);
+
+ FSDBG_BOT(265, vp, np, np->n_flag, 0xd1ed1e);
+ FREE_ZONE(np, sizeof(struct nfsnode), M_NFSNODE);
return (0);
}
/*
- * Unlock an nfsnode
+ * Acquire an NFS node lock
*/
+
int
-nfs_unlock(ap)
- struct vop_unlock_args /* {
- struct vnode *a_vp;
- } */ *ap;
+nfs_node_lock_internal(nfsnode_t np, int force)
{
-#if 0
- struct vnode* vp = ap->a_vp;
- struct nfsnode* np = VTONFS(vp);
-
- if (vp->v_type == VREG || vp->v_type == VNON) {
- if (!(np->n_flag & NLOCKED))
- panic("nfs_unlock: nfsnode not locked");
- np->n_flag &= ~NLOCKED;
- if (np->n_flag & NWANTED) {
- np->n_flag &= ~NWANTED;
- wakeup((caddr_t) np);
- }
+ FSDBG_TOP(268, np, force, 0, 0);
+ lck_mtx_lock(&np->n_lock);
+ if (!force && !(np->n_hflag && NHHASHED)) {
+ FSDBG_BOT(268, np, 0xdead, 0, 0);
+ lck_mtx_unlock(&np->n_lock);
+ return (ENOENT);
}
-#endif
-
+ FSDBG_BOT(268, np, force, 0, 0);
return (0);
}
+int
+nfs_node_lock(nfsnode_t np)
+{
+ return nfs_node_lock_internal(np, 0);
+}
+
+void
+nfs_node_lock_force(nfsnode_t np)
+{
+ nfs_node_lock_internal(np, 1);
+}
+
/*
- * Check for a locked nfsnode
+ * Release an NFS node lock
+ */
+void
+nfs_node_unlock(nfsnode_t np)
+{
+ FSDBG(269, np, current_thread(), 0, 0);
+ lck_mtx_unlock(&np->n_lock);
+}
+
+/*
+ * Acquire 2 NFS node locks
+ * - locks taken in reverse address order
+ * - both or neither of the locks are taken
+ * - only one lock taken per node (dup nodes are skipped)
*/
int
-nfs_islocked(ap)
- struct vop_islocked_args /* {
- struct vnode *a_vp;
- } */ *ap;
+nfs_node_lock2(nfsnode_t np1, nfsnode_t np2)
{
- return VTONFS(ap->a_vp)->n_flag & NLOCKED ? 1 : 0;
+ nfsnode_t first, second;
+ int error;
+
+ first = (np1 > np2) ? np1 : np2;
+ second = (np1 > np2) ? np2 : np1;
+ if ((error = nfs_node_lock(first)))
+ return (error);
+ if (np1 == np2)
+ return (error);
+ if ((error = nfs_node_lock(second)))
+ nfs_node_unlock(first);
+ return (error);
+}
+
+void
+nfs_node_unlock2(nfsnode_t np1, nfsnode_t np2)
+{
+ nfs_node_unlock(np1);
+ if (np1 != np2)
+ nfs_node_unlock(np2);
}
-#endif
/*
- * Nfs abort op, called after namei() when a CREATE/DELETE isn't actually
- * done. Currently nothing to do.
+ * Manage NFS node busy state.
+ * (Similar to NFS node locks above)
*/
-/* ARGSUSED */
int
-nfs_abortop(ap)
- struct vop_abortop_args /* {
- struct vnode *a_dvp;
- struct componentname *a_cnp;
- } */ *ap;
+nfs_node_set_busy(nfsnode_t np, thread_t thd)
+{
+ struct timespec ts = { 2, 0 };
+ int error;
+
+ if ((error = nfs_node_lock(np)))
+ return (error);
+ while (ISSET(np->n_flag, NBUSY)) {
+ SET(np->n_flag, NBUSYWANT);
+ msleep(np, &np->n_lock, PZERO-1, "nfsbusywant", &ts);
+ if ((error = nfs_sigintr(NFSTONMP(np), NULL, thd, 0)))
+ break;
+ }
+ if (!error)
+ SET(np->n_flag, NBUSY);
+ nfs_node_unlock(np);
+ return (error);
+}
+
+void
+nfs_node_clear_busy(nfsnode_t np)
+{
+ int wanted;
+
+ nfs_node_lock_force(np);
+ wanted = ISSET(np->n_flag, NBUSYWANT);
+ CLR(np->n_flag, NBUSY|NBUSYWANT);
+ nfs_node_unlock(np);
+ if (wanted)
+ wakeup(np);
+}
+
+int
+nfs_node_set_busy2(nfsnode_t np1, nfsnode_t np2, thread_t thd)
+{
+ nfsnode_t first, second;
+ int error;
+
+ first = (np1 > np2) ? np1 : np2;
+ second = (np1 > np2) ? np2 : np1;
+ if ((error = nfs_node_set_busy(first, thd)))
+ return (error);
+ if (np1 == np2)
+ return (error);
+ if ((error = nfs_node_set_busy(second, thd)))
+ nfs_node_clear_busy(first);
+ return (error);
+}
+
+void
+nfs_node_clear_busy2(nfsnode_t np1, nfsnode_t np2)
+{
+ nfs_node_clear_busy(np1);
+ if (np1 != np2)
+ nfs_node_clear_busy(np2);
+}
+
+/* helper function to sort four nodes in reverse address order (no dupes) */
+static void
+nfs_node_sort4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4, nfsnode_t *list, int *lcntp)
+{
+ nfsnode_t na[2], nb[2];
+ int a, b, i, lcnt;
+
+ /* sort pairs then merge */
+ na[0] = (np1 > np2) ? np1 : np2;
+ na[1] = (np1 > np2) ? np2 : np1;
+ nb[0] = (np3 > np4) ? np3 : np4;
+ nb[1] = (np3 > np4) ? np4 : np3;
+ for (a = b = i = lcnt = 0; i < 4; i++) {
+ if (a >= 2)
+ list[lcnt] = nb[b++];
+ else if ((b >= 2) || (na[a] >= nb[b]))
+ list[lcnt] = na[a++];
+ else
+ list[lcnt] = nb[b++];
+ if ((lcnt <= 0) || (list[lcnt] != list[lcnt-1]))
+ lcnt++; /* omit dups */
+ }
+ if (list[lcnt-1] == NULL)
+ lcnt--;
+ *lcntp = lcnt;
+}
+
+int
+nfs_node_set_busy4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4, thread_t thd)
{
+ nfsnode_t list[4];
+ int i, lcnt, error;
- if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
- FREE_ZONE(ap->a_cnp->cn_pnbuf, ap->a_cnp->cn_pnlen, M_NAMEI);
+ nfs_node_sort4(np1, np2, np3, np4, list, &lcnt);
+
+ /* Now we can lock using list[0 - lcnt-1] */
+ for (i = 0; i < lcnt; ++i)
+ if ((error = nfs_node_set_busy(list[i], thd))) {
+ /* Drop any locks we acquired. */
+ while (--i >= 0)
+ nfs_node_clear_busy(list[i]);
+ return (error);
+ }
return (0);
}
+
+void
+nfs_node_clear_busy4(nfsnode_t np1, nfsnode_t np2, nfsnode_t np3, nfsnode_t np4)
+{
+ nfsnode_t list[4];
+ int lcnt;
+
+ nfs_node_sort4(np1, np2, np3, np4, list, &lcnt);
+ while (--lcnt >= 0)
+ nfs_node_clear_busy(list[lcnt]);
+}
+
+/*
+ * Acquire an NFS node data lock
+ */
+void
+nfs_data_lock(nfsnode_t np, int locktype)
+{
+ nfs_data_lock_internal(np, locktype, 1);
+}
+void
+nfs_data_lock_noupdate(nfsnode_t np, int locktype)
+{
+ nfs_data_lock_internal(np, locktype, 0);
+}
+void
+nfs_data_lock_internal(nfsnode_t np, int locktype, int updatesize)
+{
+ FSDBG_TOP(270, np, locktype, np->n_datalockowner, 0);
+ if (locktype == NFS_DATA_LOCK_SHARED) {
+ if (updatesize && ISSET(np->n_flag, NUPDATESIZE))
+ nfs_data_update_size(np, 0);
+ lck_rw_lock_shared(&np->n_datalock);
+ } else {
+ lck_rw_lock_exclusive(&np->n_datalock);
+ np->n_datalockowner = current_thread();
+ if (updatesize && ISSET(np->n_flag, NUPDATESIZE))
+ nfs_data_update_size(np, 1);
+ }
+ FSDBG_BOT(270, np, locktype, np->n_datalockowner, 0);
+}
+
+/*
+ * Release an NFS node data lock
+ */
+void
+nfs_data_unlock(nfsnode_t np)
+{
+ nfs_data_unlock_internal(np, 1);
+}
+void
+nfs_data_unlock_noupdate(nfsnode_t np)
+{
+ nfs_data_unlock_internal(np, 0);
+}
+void
+nfs_data_unlock_internal(nfsnode_t np, int updatesize)
+{
+ int mine = (np->n_datalockowner == current_thread());
+ FSDBG_TOP(271, np, np->n_datalockowner, current_thread(), 0);
+ if (updatesize && mine && ISSET(np->n_flag, NUPDATESIZE))
+ nfs_data_update_size(np, 1);
+ np->n_datalockowner = NULL;
+ lck_rw_done(&np->n_datalock);
+ if (updatesize && !mine && ISSET(np->n_flag, NUPDATESIZE))
+ nfs_data_update_size(np, 0);
+ FSDBG_BOT(271, np, np->n_datalockowner, current_thread(), 0);
+}
+
+
+/*
+ * update an NFS node's size
+ */
+void
+nfs_data_update_size(nfsnode_t np, int datalocked)
+{
+ int error;
+
+ FSDBG_TOP(272, np, np->n_flag, np->n_size, np->n_newsize);
+ if (!datalocked) {
+ nfs_data_lock(np, NFS_DATA_LOCK_EXCLUSIVE);
+ /* grabbing data lock will automatically update size */
+ nfs_data_unlock(np);
+ FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
+ return;
+ }
+ error = nfs_node_lock(np);
+ if (error || !ISSET(np->n_flag, NUPDATESIZE)) {
+ if (!error)
+ nfs_node_unlock(np);
+ FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
+ return;
+ }
+ CLR(np->n_flag, NUPDATESIZE);
+ np->n_size = np->n_newsize;
+ /* make sure we invalidate buffers the next chance we get */
+ SET(np->n_flag, NNEEDINVALIDATE);
+ nfs_node_unlock(np);
+ ubc_setsize(NFSTOV(np), (off_t)np->n_size); /* XXX error? */
+ FSDBG_BOT(272, np, np->n_flag, np->n_size, np->n_newsize);
+}
+
projects / apple / xnu.git / blobdiff