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path: root/fs/xfs/linux-2.6/xfs_buf.c
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Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.c117
1 files changed, 59 insertions, 58 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index df0cba239dd..655bf4a78af 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
@@ -54,6 +54,7 @@
#include <linux/percpu.h>
#include <linux/blkdev.h>
#include <linux/hash.h>
+#include <linux/kthread.h>
#include "xfs_linux.h"
@@ -67,7 +68,7 @@ STATIC int xfsbufd_wakeup(int, unsigned int);
STATIC void pagebuf_delwri_queue(xfs_buf_t *, int);
STATIC struct workqueue_struct *xfslogd_workqueue;
-STATIC struct workqueue_struct *xfsdatad_workqueue;
+struct workqueue_struct *xfsdatad_workqueue;
/*
* Pagebuf debugging
@@ -590,8 +591,10 @@ found:
PB_SET_OWNER(pb);
}
- if (pb->pb_flags & PBF_STALE)
+ if (pb->pb_flags & PBF_STALE) {
+ ASSERT((pb->pb_flags & _PBF_DELWRI_Q) == 0);
pb->pb_flags &= PBF_MAPPED;
+ }
PB_TRACE(pb, "got_lock", 0);
XFS_STATS_INC(pb_get_locked);
return (pb);
@@ -700,25 +703,6 @@ xfs_buf_read_flags(
}
/*
- * Create a skeletal pagebuf (no pages associated with it).
- */
-xfs_buf_t *
-pagebuf_lookup(
- xfs_buftarg_t *target,
- loff_t ioff,
- size_t isize,
- page_buf_flags_t flags)
-{
- xfs_buf_t *pb;
-
- pb = pagebuf_allocate(flags);
- if (pb) {
- _pagebuf_initialize(pb, target, ioff, isize, flags);
- }
- return pb;
-}
-
-/*
* If we are not low on memory then do the readahead in a deadlock
* safe manner.
*/
@@ -913,22 +897,23 @@ pagebuf_rele(
do_free = 0;
}
- if (pb->pb_flags & PBF_DELWRI) {
- pb->pb_flags |= PBF_ASYNC;
- atomic_inc(&pb->pb_hold);
- pagebuf_delwri_queue(pb, 0);
- do_free = 0;
- } else if (pb->pb_flags & PBF_FS_MANAGED) {
+ if (pb->pb_flags & PBF_FS_MANAGED) {
do_free = 0;
}
if (do_free) {
+ ASSERT((pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q)) == 0);
list_del_init(&pb->pb_hash_list);
spin_unlock(&hash->bh_lock);
pagebuf_free(pb);
} else {
spin_unlock(&hash->bh_lock);
}
+ } else {
+ /*
+ * Catch reference count leaks
+ */
+ ASSERT(atomic_read(&pb->pb_hold) >= 0);
}
}
@@ -1006,13 +991,24 @@ pagebuf_lock(
* pagebuf_unlock
*
* pagebuf_unlock releases the lock on the buffer object created by
- * pagebuf_lock or pagebuf_cond_lock (not any
- * pinning of underlying pages created by pagebuf_pin).
+ * pagebuf_lock or pagebuf_cond_lock (not any pinning of underlying pages
+ * created by pagebuf_pin).
+ *
+ * If the buffer is marked delwri but is not queued, do so before we
+ * unlock the buffer as we need to set flags correctly. We also need to
+ * take a reference for the delwri queue because the unlocker is going to
+ * drop their's and they don't know we just queued it.
*/
void
pagebuf_unlock( /* unlock buffer */
xfs_buf_t *pb) /* buffer to unlock */
{
+ if ((pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q)) == PBF_DELWRI) {
+ atomic_inc(&pb->pb_hold);
+ pb->pb_flags |= PBF_ASYNC;
+ pagebuf_delwri_queue(pb, 0);
+ }
+
PB_CLEAR_OWNER(pb);
up(&pb->pb_sema);
PB_TRACE(pb, "unlock", 0);
@@ -1249,8 +1245,8 @@ bio_end_io_pagebuf(
int error)
{
xfs_buf_t *pb = (xfs_buf_t *)bio->bi_private;
- unsigned int i, blocksize = pb->pb_target->pbr_bsize;
- struct bio_vec *bvec = bio->bi_io_vec;
+ unsigned int blocksize = pb->pb_target->pbr_bsize;
+ struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
if (bio->bi_size)
return 1;
@@ -1258,10 +1254,12 @@ bio_end_io_pagebuf(
if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
pb->pb_error = EIO;
- for (i = 0; i < bio->bi_vcnt; i++, bvec++) {
+ do {
struct page *page = bvec->bv_page;
- if (pb->pb_error) {
+ if (unlikely(pb->pb_error)) {
+ if (pb->pb_flags & PBF_READ)
+ ClearPageUptodate(page);
SetPageError(page);
} else if (blocksize == PAGE_CACHE_SIZE) {
SetPageUptodate(page);
@@ -1270,10 +1268,13 @@ bio_end_io_pagebuf(
set_page_region(page, bvec->bv_offset, bvec->bv_len);
}
+ if (--bvec >= bio->bi_io_vec)
+ prefetchw(&bvec->bv_page->flags);
+
if (_pagebuf_iolocked(pb)) {
unlock_page(page);
}
- }
+ } while (bvec >= bio->bi_io_vec);
_pagebuf_iodone(pb, 1);
bio_put(bio);
@@ -1511,6 +1512,11 @@ again:
ASSERT(btp == bp->pb_target);
if (!(bp->pb_flags & PBF_FS_MANAGED)) {
spin_unlock(&hash->bh_lock);
+ /*
+ * Catch superblock reference count leaks
+ * immediately
+ */
+ BUG_ON(bp->pb_bn == 0);
delay(100);
goto again;
}
@@ -1686,17 +1692,20 @@ pagebuf_delwri_queue(
int unlock)
{
PB_TRACE(pb, "delwri_q", (long)unlock);
- ASSERT(pb->pb_flags & PBF_DELWRI);
+ ASSERT((pb->pb_flags & (PBF_DELWRI|PBF_ASYNC)) ==
+ (PBF_DELWRI|PBF_ASYNC));
spin_lock(&pbd_delwrite_lock);
/* If already in the queue, dequeue and place at tail */
if (!list_empty(&pb->pb_list)) {
+ ASSERT(pb->pb_flags & _PBF_DELWRI_Q);
if (unlock) {
atomic_dec(&pb->pb_hold);
}
list_del(&pb->pb_list);
}
+ pb->pb_flags |= _PBF_DELWRI_Q;
list_add_tail(&pb->pb_list, &pbd_delwrite_queue);
pb->pb_queuetime = jiffies;
spin_unlock(&pbd_delwrite_lock);
@@ -1713,10 +1722,11 @@ pagebuf_delwri_dequeue(
spin_lock(&pbd_delwrite_lock);
if ((pb->pb_flags & PBF_DELWRI) && !list_empty(&pb->pb_list)) {
+ ASSERT(pb->pb_flags & _PBF_DELWRI_Q);
list_del_init(&pb->pb_list);
dequeued = 1;
}
- pb->pb_flags &= ~PBF_DELWRI;
+ pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
spin_unlock(&pbd_delwrite_lock);
if (dequeued)
@@ -1733,9 +1743,7 @@ pagebuf_runall_queues(
}
/* Defines for pagebuf daemon */
-STATIC DECLARE_COMPLETION(xfsbufd_done);
STATIC struct task_struct *xfsbufd_task;
-STATIC int xfsbufd_active;
STATIC int xfsbufd_force_flush;
STATIC int xfsbufd_force_sleep;
@@ -1761,14 +1769,8 @@ xfsbufd(
xfs_buftarg_t *target;
xfs_buf_t *pb, *n;
- /* Set up the thread */
- daemonize("xfsbufd");
current->flags |= PF_MEMALLOC;
- xfsbufd_task = current;
- xfsbufd_active = 1;
- barrier();
-
INIT_LIST_HEAD(&tmp);
do {
if (unlikely(freezing(current))) {
@@ -1795,7 +1797,7 @@ xfsbufd(
break;
}
- pb->pb_flags &= ~PBF_DELWRI;
+ pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
pb->pb_flags |= PBF_WRITE;
list_move(&pb->pb_list, &tmp);
}
@@ -1816,9 +1818,9 @@ xfsbufd(
purge_addresses();
xfsbufd_force_flush = 0;
- } while (xfsbufd_active);
+ } while (!kthread_should_stop());
- complete_and_exit(&xfsbufd_done, 0);
+ return 0;
}
/*
@@ -1845,15 +1847,13 @@ xfs_flush_buftarg(
if (pb->pb_target != target)
continue;
- ASSERT(pb->pb_flags & PBF_DELWRI);
+ ASSERT(pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q));
PB_TRACE(pb, "walkq2", (long)pagebuf_ispin(pb));
if (pagebuf_ispin(pb)) {
pincount++;
continue;
}
- pb->pb_flags &= ~PBF_DELWRI;
- pb->pb_flags |= PBF_WRITE;
list_move(&pb->pb_list, &tmp);
}
spin_unlock(&pbd_delwrite_lock);
@@ -1862,12 +1862,14 @@ xfs_flush_buftarg(
* Dropped the delayed write list lock, now walk the temporary list
*/
list_for_each_entry_safe(pb, n, &tmp, pb_list) {
+ pagebuf_lock(pb);
+ pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
+ pb->pb_flags |= PBF_WRITE;
if (wait)
pb->pb_flags &= ~PBF_ASYNC;
else
list_del_init(&pb->pb_list);
- pagebuf_lock(pb);
pagebuf_iostrategy(pb);
}
@@ -1901,9 +1903,11 @@ xfs_buf_daemons_start(void)
if (!xfsdatad_workqueue)
goto out_destroy_xfslogd_workqueue;
- error = kernel_thread(xfsbufd, NULL, CLONE_FS|CLONE_FILES);
- if (error < 0)
+ xfsbufd_task = kthread_run(xfsbufd, NULL, "xfsbufd");
+ if (IS_ERR(xfsbufd_task)) {
+ error = PTR_ERR(xfsbufd_task);
goto out_destroy_xfsdatad_workqueue;
+ }
return 0;
out_destroy_xfsdatad_workqueue:
@@ -1920,10 +1924,7 @@ xfs_buf_daemons_start(void)
STATIC void
xfs_buf_daemons_stop(void)
{
- xfsbufd_active = 0;
- barrier();
- wait_for_completion(&xfsbufd_done);
-
+ kthread_stop(xfsbufd_task);
destroy_workqueue(xfslogd_workqueue);
destroy_workqueue(xfsdatad_workqueue);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 20:56:49 +0000