* @(#)vfs_bio.c 8.6 (Berkeley) 1/11/94
*/
-
/*
* Some references:
* Bach: The Design of the UNIX Operating System (Prentice Hall, 1986)
* Leffler, et al.: The Design and Implementation of the 4.3BSD
* UNIX Operating System (Addison Welley, 1989)
*/
-#define ZALLOC_METADATA 1
#include <sys/param.h>
#include <sys/systm.h>
#include <kern/zalloc.h>
#include <sys/kdebug.h>
+#include <machine/spl.h>
-extern void bufqinc(int q);
-extern void bufqdec(int q);
-extern void bufq_balance_thread_init();
+static __inline__ void bufqinc(int q);
+static __inline__ void bufqdec(int q);
-extern void reassignbuf(struct buf *, struct vnode *);
static struct buf *getnewbuf(int slpflag, int slptimeo, int *queue);
+static int bcleanbuf(struct buf *bp);
+extern void vwakeup();
extern int niobuf; /* The number of IO buffer headers for cluster IO */
int blaundrycnt;
(bp)->b_hash.le_next = (struct buf *)0; \
(bp)->b_hash.le_prev = (struct buf **)0xdeadbeef;
+/*
+ * Insq/Remq for the vnode usage lists.
+ */
+#define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs)
+#define bufremvn(bp) { \
+ LIST_REMOVE(bp, b_vnbufs); \
+ (bp)->b_vnbufs.le_next = NOLIST; \
+}
+
simple_lock_data_t bufhashlist_slock; /* lock on buffer hash list */
/* number of per vnode, "in flight" buffer writes */
int age_is_stale = AGE_IS_STALE;
int meta_is_stale = META_IS_STALE;
-#if 1
-void
+/* LIST_INSERT_HEAD() with assertions */
+static __inline__ void
blistenterhead(struct bufhashhdr * head, struct buf * bp)
{
if ((bp->b_hash.le_next = (head)->lh_first) != NULL)
bp->b_hash.le_prev = &(head)->lh_first;
if (bp->b_hash.le_prev == (struct buf **)0xdeadbeef)
panic("blistenterhead: le_prev is deadbeef");
-
}
-#endif
-#if 1
-void
+static __inline__ void
binshash(struct buf *bp, struct bufhashhdr *dp)
{
-int s;
-
-struct buf *nbp;
+ struct buf *nbp;
simple_lock(&bufhashlist_slock);
+
#if 0
- if(incore(bp->b_vp, bp->b_lblkno)) {
- panic("adding to queue already existing element");
- }
+ if(incore(bp->b_vp, bp->b_lblkno))
+ panic("binshash: already incore");
#endif /* 0 */
+
BHASHENTCHECK(bp);
-
+
nbp = dp->lh_first;
for(; nbp != NULL; nbp = nbp->b_hash.le_next) {
if(nbp == bp)
panic("buf already in hashlist");
}
-#if 0
- LIST_INSERT_HEAD(dp, bp, b_hash);
-#else
blistenterhead(dp, bp);
-#endif
simple_unlock(&bufhashlist_slock);
}
-void
+static __inline__ void
bremhash(struct buf *bp)
{
- int s;
-
simple_lock(&bufhashlist_slock);
if (bp->b_hash.le_prev == (struct buf **)0xdeadbeef)
panic("bremhash le_prev is deadbeef");
simple_unlock(&bufhashlist_slock);
}
-#endif /* 1 */
-
-
/*
* Remove a buffer from the free list it's on
*/
bp->b_timestamp = 0;
}
+/*
+ * Associate a buffer with a vnode.
+ */
+static void
+bgetvp(vp, bp)
+ register struct vnode *vp;
+ register struct buf *bp;
+{
+
+ if (bp->b_vp != vp)
+ panic("bgetvp: not free");
+ VHOLD(vp);
+ bp->b_vp = vp;
+ if (vp->v_type == VBLK || vp->v_type == VCHR)
+ bp->b_dev = vp->v_rdev;
+ else
+ bp->b_dev = NODEV;
+ /*
+ * Insert onto list for new vnode.
+ */
+ bufinsvn(bp, &vp->v_cleanblkhd);
+}
+
+/*
+ * Disassociate a buffer from a vnode.
+ */
+static void
+brelvp(bp)
+ register struct buf *bp;
+{
+ struct vnode *vp;
+
+ if (bp->b_vp == (struct vnode *) 0)
+ panic("brelvp: NULL vp");
+ /*
+ * Delete from old vnode list, if on one.
+ */
+ if (bp->b_vnbufs.le_next != NOLIST)
+ bufremvn(bp);
+ vp = bp->b_vp;
+ bp->b_vp = (struct vnode *) 0;
+ HOLDRELE(vp);
+}
+
+/*
+ * Reassign a buffer from one vnode to another.
+ * Used to assign file specific control information
+ * (indirect blocks) to the vnode to which they belong.
+ */
+void
+reassignbuf(bp, newvp)
+ register struct buf *bp;
+ register struct vnode *newvp;
+{
+ register struct buflists *listheadp;
+
+ if (newvp == NULL) {
+ printf("reassignbuf: NULL");
+ return;
+ }
+ /*
+ * Delete from old vnode list, if on one.
+ */
+ if (bp->b_vnbufs.le_next != NOLIST)
+ bufremvn(bp);
+ /*
+ * If dirty, put on list of dirty buffers;
+ * otherwise insert onto list of clean buffers.
+ */
+ if (ISSET(bp->b_flags, B_DELWRI))
+ listheadp = &newvp->v_dirtyblkhd;
+ else
+ listheadp = &newvp->v_cleanblkhd;
+ bufinsvn(bp, listheadp);
+}
+
static __inline__ void
bufhdrinit(struct buf *bp)
{
/*
* Initialize buffers and hash links for buffers.
*/
-void
+__private_extern__ void
bufinit()
{
register struct buf *bp;
bcleanbuf_thread_init();
#if 0 /* notyet */
+ {
+ static void bufq_balance_thread_init();
/* create a thread to do dynamic buffer queue balancing */
bufq_balance_thread_init();
-#endif /* XXX */
+ }
+#endif /* notyet */
}
-/* __inline */
-struct buf *
+static struct buf *
bio_doread(vp, blkno, size, cred, async, queuetype)
struct vnode *vp;
daddr_t blkno;
{
int rv, sync, wasdelayed;
struct proc *p = current_proc();
- upl_t upl;
- upl_page_info_t *pl;
- void * object;
- kern_return_t kret;
struct vnode *vp = bp->b_vp;
/* Remember buffer type, to switch on it later. */
sync = !ISSET(bp->b_flags, B_ASYNC);
wasdelayed = ISSET(bp->b_flags, B_DELWRI);
CLR(bp->b_flags, (B_READ | B_DONE | B_ERROR | B_DELWRI));
- if (wasdelayed)
+ if (wasdelayed) {
nbdwrite--;
+ wakeup((caddr_t)&nbdwrite);
+ }
if (!sync) {
/*
* buffers faster than the disks can service. Doing a bawrite() in
* cases were we have "too many" outstanding bdwrite()s avoids that.
*/
-void
-bdwrite(bp)
+__private_extern__ int
+bdwrite_internal(bp, return_error)
struct buf *bp;
+ int return_error;
{
struct proc *p = current_proc();
struct vnode *vp = bp->b_vp;
reassignbuf(bp, vp);
}
-
/* If this is a tape block, write it the block now. */
if (ISSET(bp->b_flags, B_TAPE)) {
/* bwrite(bp); */
- VOP_BWRITE(bp);
- return;
+ VOP_BWRITE(bp);
+ return (0);
}
/*
panic("bdwrite: Negative nbdwrite");
if (nbdwrite > ((nbuf/4)*3)) {
- bawrite(bp);
- return;
+ if (return_error)
+ return (EAGAIN);
+ else
+ bawrite(bp);
+ return (0);
}
/* Otherwise, the "write" is done, so mark and release the buffer. */
SET(bp->b_flags, B_DONE);
brelse(bp);
+ return (0);
}
+void
+bdwrite(bp)
+ struct buf *bp;
+{
+ (void) bdwrite_internal(bp, 0);
+}
+
+
/*
* Asynchronous block write; just an asynchronous bwrite().
*
* We limit the number of "in flight" writes a vnode can have to
* avoid this.
*/
-void
-bawrite(bp)
+static int
+bawrite_internal(bp, throttle)
struct buf *bp;
+ int throttle;
{
struct vnode *vp = bp->b_vp;
* wait for them to finish the IO
*/
while (vp->v_numoutput >= BUFWRITE_THROTTLE) {
- vp->v_flag |= VTHROTTLED;
- (void)tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "bawrite", 0);
+ if (throttle) {
+ vp->v_flag |= VTHROTTLED;
+ (void)tsleep((caddr_t)&vp->v_numoutput,
+ PRIBIO + 1, "bawrite", 0);
+ } else
+ return (EWOULDBLOCK);
}
}
SET(bp->b_flags, B_ASYNC);
VOP_BWRITE(bp);
+ return (0);
+}
+
+void
+bawrite(bp)
+ struct buf *bp;
+{
+ (void) bawrite_internal(bp, 1);
+}
+
+/*
+ * bwillwrite:
+ *
+ * Called prior to the locking of any vnodes when we are expecting to
+ * write. We do not want to starve the buffer cache with too many
+ * dirty buffers so we block here. By blocking prior to the locking
+ * of any vnodes we attempt to avoid the situation where a locked vnode
+ * prevents the various system daemons from flushing related buffers.
+ */
+
+void
+bwillwrite(void)
+{
+ /* XXX To be implemented later */
}
/*
if (ISSET(bp->b_flags, B_DELWRI)) {
CLR(bp->b_flags, B_DELWRI);
nbdwrite--;
+ wakeup((caddr_t)&nbdwrite);
}
if (bp->b_bufsize <= 0)
whichq = BQ_EMPTY; /* no data */
+ else if (ISSET(bp->b_flags, B_META))
+ whichq = BQ_META; /* meta-data */
else
whichq = BQ_AGE; /* invalid data */
daddr_t blkno;
{
struct buf *bp;
- int bufseen = 0;
bp = BUFHASH(vp, blkno)->lh_first;
/* Search hash chain */
- for (; bp != NULL; bp = bp->b_hash.le_next, bufseen++) {
+ for (; bp != NULL; bp = bp->b_hash.le_next) {
if (bp->b_lblkno == blkno && bp->b_vp == vp &&
!ISSET(bp->b_flags, B_INVAL))
return (bp);
- if(bufseen >= nbuf)
- panic("walked more than nbuf in incore");
-
}
return (0);
start:
s = splbio();
- if (bp = incore(vp, blkno)) {
+ if ((bp = incore(vp, blkno))) {
/* Found in the Buffer Cache */
if (ISSET(bp->b_flags, B_BUSY)) {
/* but is busy */
CLR(bp->b_flags, B_WASDIRTY);
kret = ubc_upl_map(upl, (vm_address_t *)&(bp->b_data));
- if (kret != KERN_SUCCESS) {
+ if (kret != KERN_SUCCESS)
panic("getblk: ubc_upl_map() failed with (%d)",
kret);
- }
- if (bp->b_data == 0) panic("ubc_upl_map mapped 0");
+ if (bp->b_data == 0)
+ panic("ubc_upl_map mapped 0");
}
break;
* VM is not involved in IO for the meta data
* buffer already has valid data
*/
- if(bp->b_data == 0)
+ if(bp->b_data == 0)
panic("bp->b_data null incore buf=%x", bp);
break;
SET(bp->b_flags, B_META);
queue = BQ_META;
}
+
+ bp->b_blkno = bp->b_lblkno = blkno;
+ bp->b_vp = vp;
+
/*
* Insert in the hash so that incore() can find it
*/
binshash(bp, BUFHASH(vp, blkno));
+ s = splbio();
+ bgetvp(vp, bp);
+ splx(s);
+
allocbuf(bp, size);
switch (operation) {
case BLK_META:
/* buffer data is invalid */
-#if !ZALLOC_METADATA
- if (bp->b_data)
- panic("bp->b_data is not nul; %x",bp);
- kret = kmem_alloc(kernel_map,
- &bp->b_data, bp->b_bufsize);
- if (kret != KERN_SUCCESS)
- panic("getblk: kmem_alloc() returned %d", kret);
-#endif /* ZALLOC_METADATA */
-
if(bp->b_data == 0)
panic("bp->b_data is null %x",bp);
- bp->b_blkno = bp->b_lblkno = blkno;
- s = splbio();
- bgetvp(vp, bp);
bufstats.bufs_miss++;
- splx(s);
- if (bp->b_data == 0)
- panic("b_data is 0: 2");
/* wakeup the buffer */
CLR(bp->b_flags, B_WANTED);
#ifdef UBC_DEBUG
upl_ubc_alias_set(upl, bp, 4);
#endif /* UBC_DEBUG */
- bp->b_blkno = bp->b_lblkno = blkno;
bp->b_pagelist = upl;
SET(bp->b_flags, B_PAGELIST);
bp->b_dirtyend = 0;
}
}
- if (error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL)) {
- panic("VOP_BMAP failed in getblk");
+ error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
+ if(error) {
+ panic("getblk: VOP_BMAP failed");
/*NOTREACHED*/
/*
* XXX: We probably should invalidate the VM Page
panic("getblk: ubc_upl_map() "
"failed with (%d)", kret);
}
- if (bp->b_data == 0) panic("kernel_upl_map mapped 0");
-
- s = splbio();
- bgetvp(vp, bp);
- splx(s);
+ if (bp->b_data == 0)
+ panic("kernel_upl_map mapped 0");
break;
panic("getblk: bp->b_addr is null");
if (bp->b_bufsize & 0xfff) {
-#if ZALLOC_METADATA
if (ISSET(bp->b_flags, B_META) && (bp->b_bufsize & 0x1ff))
-#endif /* ZALLOC_METADATA */
panic("getblk: bp->b_bufsize = %d", bp->b_bufsize);
}
{
struct buf *bp;
int queue = BQ_EMPTY;
-#if !ZALLOC_METADATA
- kern_return_t kret;
- vm_size_t desired_size = roundup(size, CLBYTES);
-
- if (desired_size > MAXBSIZE)
- panic("geteblk: buffer larger than MAXBSIZE requested");
-#endif /* ZALLOC_METADATA */
while ((bp = getnewbuf(0, 0, &queue)) == 0)
;
-#if ZALLOC_METADATA
SET(bp->b_flags, (B_META|B_INVAL));
-#else
- SET(bp->b_flags, B_INVAL);
-#endif /* ZALLOC_METADATA */
#if DIAGNOSTIC
assert(queue == BQ_EMPTY);
#endif /* DIAGNOSTIC */
/* XXX need to implement logic to deal with other queues */
-#if !ZALLOC_METADATA
- /* Empty buffer - allocate pages */
- kret = kmem_alloc_aligned(kernel_map, &bp->b_data, desired_size);
- if (kret != KERN_SUCCESS)
- panic("geteblk: kmem_alloc_aligned returned %d", kret);
-#endif /* ZALLOC_METADATA */
-
binshash(bp, &invalhash);
allocbuf(bp, size);
bufstats.bufs_eblk++;
return (bp);
}
-#if ZALLOC_METADATA
/*
* Zones for the meta data buffers
*/
struct meta_zone_entry meta_zones[] = {
{NULL, (MINMETA * 1), 128 * (MINMETA * 1), "buf.512" },
{NULL, (MINMETA * 2), 64 * (MINMETA * 2), "buf.1024" },
- {NULL, (MINMETA * 3), 16 * (MINMETA * 3), "buf.1536" },
{NULL, (MINMETA * 4), 16 * (MINMETA * 4), "buf.2048" },
- {NULL, (MINMETA * 5), 16 * (MINMETA * 5), "buf.2560" },
- {NULL, (MINMETA * 6), 16 * (MINMETA * 6), "buf.3072" },
- {NULL, (MINMETA * 7), 16 * (MINMETA * 7), "buf.3584" },
{NULL, (MINMETA * 8), 512 * (MINMETA * 8), "buf.4096" },
{NULL, 0, 0, "" } /* End */
};
-#endif /* ZALLOC_METADATA */
/*
* Initialize the meta data zones
static void
bufzoneinit(void)
{
-#if ZALLOC_METADATA
int i;
for (i = 0; meta_zones[i].mz_size != 0; i++) {
PAGE_SIZE,
meta_zones[i].mz_name);
}
-#endif /* ZALLOC_METADATA */
buf_hdr_zone = zinit(sizeof(struct buf), 32, PAGE_SIZE, "buf headers");
}
-#if ZALLOC_METADATA
-static zone_t
+static __inline__ zone_t
getbufzone(size_t size)
{
int i;
- if (size % 512)
+ if ((size % 512) || (size < MINMETA) || (size > MAXMETA))
panic("getbufzone: incorect size = %d", size);
- i = (size / 512) - 1;
+ for (i = 0; meta_zones[i].mz_size != 0; i++) {
+ if (meta_zones[i].mz_size >= size)
+ break;
+ }
+
return (meta_zones[i].mz_zone);
}
-#endif /* ZALLOC_METADATA */
/*
* With UBC, there is no need to expand / shrink the file data
if (desired_size > MAXBSIZE)
panic("allocbuf: buffer larger than MAXBSIZE requested");
-#if ZALLOC_METADATA
if (ISSET(bp->b_flags, B_META)) {
kern_return_t kret;
zone_t zprev, z;
if (ISSET(bp->b_flags, B_META) && (bp->b_data == 0))
panic("allocbuf: bp->b_data is NULL");
-#endif /* ZALLOC_METADATA */
- bp->b_bufsize = desired_size;
- bp->b_bcount = size;
+ bp->b_bufsize = desired_size;
+ bp->b_bcount = size;
+ return (0);
}
/*
register struct buf *meta_bp;
register int age_time, lru_time, bp_time, meta_time;
int s;
- struct ucred *cred;
int req = *queue; /* save it for restarts */
start:
lru_bp = bufqueues[BQ_LRU].tqh_first;
meta_bp = bufqueues[BQ_META].tqh_first;
- if (!age_bp && !lru_bp && !meta_bp) { /* Unavailble on AGE or LRU */
- /* Try the empty list first */
+ if (!age_bp && !lru_bp && !meta_bp) {
+ /*
+ * Unavailble on AGE or LRU or META queues
+ * Try the empty list first
+ */
bp = bufqueues[BQ_EMPTY].tqh_first;
if (bp) {
*queue = BQ_EMPTY;
splx(s);
return (bp);
}
+
#include <mach/mach_types.h>
#include <mach/memory_object_types.h>
+#include <kern/sched_prim.h>
/*
* Clean a buffer.
* Returns 1 if issued a bawrite() to indicate
* that the buffer is not ready.
*/
-int
+static int
bcleanbuf(struct buf *bp)
{
int s;
binstailfree(bp, &bufqueues[BQ_LAUNDRY], BQ_LAUNDRY);
blaundrycnt++;
wakeup(&blaundrycnt);
+ /* and give it a chance to run */
+ (void)thread_block(THREAD_CONTINUE_NULL);
return (1);
}
splx(s);
if (ISSET(bp->b_flags, B_META)) {
-#if ZALLOC_METADATA
vm_offset_t elem = (vm_offset_t)bp->b_data;
if (elem == 0)
panic("bcleanbuf: NULL bp->b_data B_META buffer");
bp->b_data = (caddr_t)0xdeadbeef;
kmem_free(kernel_map, elem, bp->b_bufsize);
}
-#else
- if (bp->b_data == 0)
- panic("bcleanbuf: bp->b_data == NULL for B_META buffer");
-
- kmem_free(kernel_map, bp->b_data, bp->b_bufsize);
-#endif /* ZALLOC_METADATA */
}
trace(TR_BRELSE, pack(bp->b_vp, bp->b_bufsize), bp->b_lblkno);
biowait(bp)
struct buf *bp;
{
- upl_t upl;
- upl_page_info_t *pl;
int s;
- kern_return_t kret;
s = splbio();
while (!ISSET(bp->b_flags, B_DONE))
if (!ISSET(bp->b_flags, B_READ) && !ISSET(bp->b_flags, B_RAW))
vwakeup(bp); /* wake up reader */
-
+
+ if (kdebug_enable) {
+ int code = DKIO_DONE;
+
+ if (bp->b_flags & B_READ)
+ code |= DKIO_READ;
+ if (bp->b_flags & B_ASYNC)
+ code |= DKIO_ASYNC;
+
+ if (bp->b_flags & B_META)
+ code |= DKIO_META;
+ else if (bp->b_flags & (B_PGIN | B_PAGEOUT))
+ code |= DKIO_PAGING;
+
+ KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_DKRW, code) | DBG_FUNC_NONE,
+ bp, bp->b_vp, bp->b_resid, bp->b_error, 0);
+ }
+
/* Wakeup the throttled write operations as needed */
vp = bp->b_vp;
if (vp
return (nbusy);
}
-#if 1 /*DIAGNOSTIC */
+#if DIAGNOSTIC
/*
* Print out statistics on the current allocation of the buffer pool.
* Can be enabled to print out on every ``sync'' by setting "syncprt"
}
#endif /* DIAGNOSTIC */
-#define NRESERVEDIOBUFS 16
+#define NRESERVEDIOBUFS 64
-struct buf *
+__private_extern__ struct buf *
alloc_io_buf(vp, priv)
struct vnode *vp;
int priv;
return (bp);
}
-void
+__private_extern__ void
free_io_buf(bp)
struct buf *bp;
{
splx(s);
}
-
-/* not hookedup yet */
+/* disabled for now */
/* XXX move this to a separate file */
/*
long bufqscanwait = 0;
-extern void bufqscan_thread();
-extern int balancebufq(int q);
-extern int btrimempty(int n);
-extern int initbufqscan(void);
-extern int nextbufq(int q);
-extern void buqlimprt(int all);
+static void bufqscan_thread();
+static int balancebufq(int q);
+static int btrimempty(int n);
+static __inline__ int initbufqscan(void);
+static __inline__ int nextbufq(int q);
+static void buqlimprt(int all);
-void
+static void
bufq_balance_thread_init()
{
if (bufqscanwait++ == 0) {
- int i;
/* Initalize globals */
MAXNBUF = (mem_size / PAGE_SIZE);
}
/* The workloop for the buffer balancing thread */
-void
+static void
bufqscan_thread()
{
boolean_t funnel_state;
do {
int q; /* buffer queue to process */
- for (q = initbufqscan(); q; ) {
+ q = initbufqscan();
+ for (; q; ) {
moretodo |= balancebufq(q);
q = nextbufq(q);
}
} while (moretodo);
-#if 1 || DIAGNOSTIC
+#if DIAGNOSTIC
vfs_bufstats();
buqlimprt(0);
#endif
}
/* Seed for the buffer queue balancing */
-int
+static __inline__ int
initbufqscan()
{
/* Start with AGE queue */
}
/* Pick next buffer queue to balance */
-int
+static __inline__ int
nextbufq(int q)
{
int order[] = { BQ_AGE, BQ_LRU, BQ_META, BQ_EMPTY, 0 };
}
/* function to balance the buffer queues */
-int
+static int
balancebufq(int q)
{
int moretodo = 0;
return (moretodo);
}
-int
+static int
btrimempty(int n)
{
/*
return (0);
}
-void
+static __inline__ void
bufqinc(int q)
{
if ((q < 0) || (q >= BQUEUES))
return;
}
-void
+static __inline__ void
bufqdec(int q)
{
if ((q < 0) || (q >= BQUEUES))
return;
}
-void
+static void
buqlimprt(int all)
{
int i;
if (all)
for (i = 0; i < BQUEUES; i++) {
printf("%s : ", bname[i]);
- printf("min = %d, ", (long)bufqlim[i].bl_nlow);
- printf("cur = %d, ", (long)bufqlim[i].bl_num);
- printf("max = %d, ", (long)bufqlim[i].bl_nlhigh);
- printf("target = %d, ", (long)bufqlim[i].bl_target);
- printf("stale after %d seconds\n", bufqlim[i].bl_stale);
+ printf("min = %ld, ", (long)bufqlim[i].bl_nlow);
+ printf("cur = %ld, ", (long)bufqlim[i].bl_num);
+ printf("max = %ld, ", (long)bufqlim[i].bl_nlhigh);
+ printf("target = %ld, ", (long)bufqlim[i].bl_target);
+ printf("stale after %ld seconds\n", bufqlim[i].bl_stale);
}
else
for (i = 0; i < BQUEUES; i++) {
printf("%s : ", bname[i]);
- printf("cur = %d, ", (long)bufqlim[i].bl_num);
+ printf("cur = %ld, ", (long)bufqlim[i].bl_num);
}
}
{
boolean_t funnel_state;
struct buf *bp;
+ int error = 0;
+ int loopcnt = 0;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
bremfree(bp);
blaundrycnt--;
/* do the IO */
- bawrite(bp);
+ error = bawrite_internal(bp, 0);
+ if (error) {
+ binstailfree(bp, &bufqueues[BQ_LAUNDRY], BQ_LAUNDRY);
+ blaundrycnt++;
+ if (loopcnt > 10) {
+ (void)tsleep((void *)&blaundrycnt, PRIBIO, "blaundry", 1);
+ loopcnt = 0;
+ } else {
+ (void)thread_block(THREAD_CONTINUE_NULL);
+ loopcnt++;
+ }
+ }
/* start again */
goto doit;
(void) thread_funnel_set(kernel_flock, funnel_state);
}
-
projects / apple / xnu.git / blobdiff