* [PATCH 2/4] xfs: remove log item from AIL in xfs_iflush after a shutdown
2012-03-16 17:55 [PATCH 0/4] implement filesystem freezing by emptying the AIL Christoph Hellwig
2012-03-16 17:55 ` [PATCH 1/4] xfs: remove log item from AIL in xfs_qm_dqflush after a shutdown Christoph Hellwig
@ 2012-03-16 17:55 ` Christoph Hellwig
2012-03-21 23:20 ` Dave Chinner
2012-03-16 17:55 ` [PATCH 3/4] xfs: allow assigning the tail lsn with the AIL lock held Christoph Hellwig
2012-03-16 17:55 ` [PATCH 4/4] xfs: implement freezing by emptying the AIL Christoph Hellwig
3 siblings, 1 reply; 14+ messages in thread
From: Christoph Hellwig @ 2012-03-16 17:55 UTC (permalink / raw)
To: xfs
[-- Attachment #1: xfs-delete-inode-from-ail-earlier --]
[-- Type: text/plain, Size: 3719 bytes --]
If a filesystem has been forced shutdown we are never going to write inodes
to disk, which means the inode items will stay in the AIL until we free
the inode. Currently that is not a problem, but a pending change requires us
to empty the AIL before shutting down the filesystem. In that case leaving
the inode in the AIL is lethal. Make sure to remove the log item from the AIL
to allow emptying the AIL on shutdown filesystems.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_iget.c | 18 +-----------------
fs/xfs/xfs_inode.c | 17 +++++++++--------
fs/xfs/xfs_sync.c | 1 +
3 files changed, 11 insertions(+), 25 deletions(-)
Index: xfs/fs/xfs/xfs_inode.c
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.c 2012-03-16 12:44:56.037030588 +0100
+++ xfs/fs/xfs/xfs_inode.c 2012-03-16 12:47:03.697032954 +0100
@@ -2397,7 +2397,6 @@ xfs_iflush(
xfs_inode_t *ip,
uint flags)
{
- xfs_inode_log_item_t *iip;
xfs_buf_t *bp;
xfs_dinode_t *dip;
xfs_mount_t *mp;
@@ -2410,7 +2409,6 @@ xfs_iflush(
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
- iip = ip->i_itemp;
mp = ip->i_mount;
/*
@@ -2447,13 +2445,14 @@ xfs_iflush(
/*
* This may have been unpinned because the filesystem is shutting
* down forcibly. If that's the case we must not write this inode
- * to disk, because the log record didn't make it to disk!
+ * to disk, because the log record didn't make it to disk.
+ *
+ * We also have to remove the log item from the AIL in this case,
+ * as we wait for an empty AIL as part of the unmount process.
*/
if (XFS_FORCED_SHUTDOWN(mp)) {
- if (iip)
- iip->ili_fields = 0;
- xfs_ifunlock(ip);
- return XFS_ERROR(EIO);
+ error = XFS_ERROR(EIO);
+ goto abort_out;
}
/*
@@ -2500,11 +2499,13 @@ corrupt_out:
xfs_buf_relse(bp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
cluster_corrupt_out:
+ error = XFS_ERROR(EFSCORRUPTED);
+abort_out:
/*
* Unlocks the flush lock
*/
xfs_iflush_abort(ip);
- return XFS_ERROR(EFSCORRUPTED);
+ return error;
}
Index: xfs/fs/xfs/xfs_iget.c
===================================================================
--- xfs.orig/fs/xfs/xfs_iget.c 2012-03-16 12:44:56.047030587 +0100
+++ xfs/fs/xfs/xfs_iget.c 2012-03-16 12:47:03.697032954 +0100
@@ -123,23 +123,7 @@ xfs_inode_free(
xfs_idestroy_fork(ip, XFS_ATTR_FORK);
if (ip->i_itemp) {
- /*
- * Only if we are shutting down the fs will we see an
- * inode still in the AIL. If it is there, we should remove
- * it to prevent a use-after-free from occurring.
- */
- xfs_log_item_t *lip = &ip->i_itemp->ili_item;
- struct xfs_ail *ailp = lip->li_ailp;
-
- ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
- XFS_FORCED_SHUTDOWN(ip->i_mount));
- if (lip->li_flags & XFS_LI_IN_AIL) {
- spin_lock(&ailp->xa_lock);
- if (lip->li_flags & XFS_LI_IN_AIL)
- xfs_trans_ail_delete(ailp, lip);
- else
- spin_unlock(&ailp->xa_lock);
- }
+ ASSERT(!(ip->i_itemp->ili_item.li_flags & XFS_LI_IN_AIL));
xfs_inode_item_destroy(ip);
ip->i_itemp = NULL;
}
Index: xfs/fs/xfs/xfs_sync.c
===================================================================
--- xfs.orig/fs/xfs/xfs_sync.c 2012-03-16 12:44:57.707030619 +0100
+++ xfs/fs/xfs/xfs_sync.c 2012-03-16 12:47:03.697032954 +0100
@@ -783,6 +783,7 @@ restart:
goto reclaim;
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
xfs_iunpin_wait(ip);
+ xfs_iflush_abort(ip);
goto reclaim;
}
if (xfs_ipincount(ip)) {
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^ permalink raw reply [flat|nested] 14+ messages in thread* [PATCH 3/4] xfs: allow assigning the tail lsn with the AIL lock held
2012-03-16 17:55 [PATCH 0/4] implement filesystem freezing by emptying the AIL Christoph Hellwig
2012-03-16 17:55 ` [PATCH 1/4] xfs: remove log item from AIL in xfs_qm_dqflush after a shutdown Christoph Hellwig
2012-03-16 17:55 ` [PATCH 2/4] xfs: remove log item from AIL in xfs_iflush " Christoph Hellwig
@ 2012-03-16 17:55 ` Christoph Hellwig
2012-03-21 17:22 ` Mark Tinguely
2012-03-21 23:29 ` Dave Chinner
2012-03-16 17:55 ` [PATCH 4/4] xfs: implement freezing by emptying the AIL Christoph Hellwig
3 siblings, 2 replies; 14+ messages in thread
From: Christoph Hellwig @ 2012-03-16 17:55 UTC (permalink / raw)
To: xfs
[-- Attachment #1: xfs-lockless-xlog_assign_tail_lsn --]
[-- Type: text/plain, Size: 5206 bytes --]
Provide a variant of xlog_assign_tail_lsn that has the AIL lock already
held. By doing so we do an additional atomic_read + atomic_set under
the lock, which comes down to two instructions.
Switch xfs_trans_ail_update_bulk and xfs_trans_ail_delete_bulk to the
new version to reduce the number of lock roundtrips, and prepare for
a new addition that would require a third lock roundtrip in
xfs_trans_ail_delete_bulk. This addition is also the reason for
slightly rearranging the conditionals and relying on xfs_log_space_wake
for checking that the filesystem has been shut down internally.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_log.c | 31 +++++++++++++++++++++++--------
fs/xfs/xfs_log.h | 1 +
fs/xfs/xfs_trans_ail.c | 22 +++++++++++++++-------
fs/xfs/xfs_trans_priv.h | 1 +
4 files changed, 40 insertions(+), 15 deletions(-)
Index: xfs/fs/xfs/xfs_log.c
===================================================================
--- xfs.orig/fs/xfs/xfs_log.c 2012-03-16 12:44:55.880363918 +0100
+++ xfs/fs/xfs/xfs_log.c 2012-03-16 12:50:24.040370003 +0100
@@ -915,27 +915,42 @@ xfs_log_need_covered(xfs_mount_t *mp)
* We may be holding the log iclog lock upon entering this routine.
*/
xfs_lsn_t
-xlog_assign_tail_lsn(
+xlog_assign_tail_lsn_locked(
struct xfs_mount *mp)
{
- xfs_lsn_t tail_lsn;
struct log *log = mp->m_log;
+ struct xfs_log_item *lip;
+ xfs_lsn_t tail_lsn;
+
+ assert_spin_locked(&mp->m_ail->xa_lock);
/*
* To make sure we always have a valid LSN for the log tail we keep
* track of the last LSN which was committed in log->l_last_sync_lsn,
- * and use that when the AIL was empty and xfs_ail_min_lsn returns 0.
- *
- * If the AIL has been emptied we also need to wake any process
- * waiting for this condition.
+ * and use that when the AIL was empty.
*/
- tail_lsn = xfs_ail_min_lsn(mp->m_ail);
- if (!tail_lsn)
+ lip = xfs_ail_min(mp->m_ail);
+ if (lip)
+ tail_lsn = lip->li_lsn;
+ else
tail_lsn = atomic64_read(&log->l_last_sync_lsn);
atomic64_set(&log->l_tail_lsn, tail_lsn);
return tail_lsn;
}
+xfs_lsn_t
+xlog_assign_tail_lsn(
+ struct xfs_mount *mp)
+{
+ xfs_lsn_t tail_lsn;
+
+ spin_lock(&mp->m_ail->xa_lock);
+ tail_lsn = xlog_assign_tail_lsn_locked(mp);
+ spin_unlock(&mp->m_ail->xa_lock);
+
+ return tail_lsn;
+}
+
/*
* Return the space in the log between the tail and the head. The head
* is passed in the cycle/bytes formal parms. In the special case where
Index: xfs/fs/xfs/xfs_log.h
===================================================================
--- xfs.orig/fs/xfs/xfs_log.h 2012-03-16 12:44:55.893697252 +0100
+++ xfs/fs/xfs/xfs_log.h 2012-03-16 12:47:09.127033055 +0100
@@ -152,6 +152,7 @@ int xfs_log_mount(struct xfs_mount *mp
int num_bblocks);
int xfs_log_mount_finish(struct xfs_mount *mp);
xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
+xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
void xfs_log_space_wake(struct xfs_mount *mp);
int xfs_log_notify(struct xfs_mount *mp,
struct xlog_in_core *iclog,
Index: xfs/fs/xfs/xfs_trans_ail.c
===================================================================
--- xfs.orig/fs/xfs/xfs_trans_ail.c 2012-03-16 12:44:55.917030586 +0100
+++ xfs/fs/xfs/xfs_trans_ail.c 2012-03-16 12:50:20.483703269 +0100
@@ -79,7 +79,7 @@ xfs_ail_check(
* Return a pointer to the first item in the AIL. If the AIL is empty, then
* return NULL.
*/
-static xfs_log_item_t *
+xfs_log_item_t *
xfs_ail_min(
struct xfs_ail *ailp)
{
@@ -667,11 +667,15 @@ xfs_trans_ail_update_bulk(
if (!list_empty(&tmp))
xfs_ail_splice(ailp, cur, &tmp, lsn);
- spin_unlock(&ailp->xa_lock);
- if (mlip_changed && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
- xlog_assign_tail_lsn(ailp->xa_mount);
+ if (mlip_changed) {
+ if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
+ xlog_assign_tail_lsn_locked(ailp->xa_mount);
+ spin_unlock(&ailp->xa_lock);
+
xfs_log_space_wake(ailp->xa_mount);
+ } else {
+ spin_unlock(&ailp->xa_lock);
}
}
@@ -729,11 +733,15 @@ xfs_trans_ail_delete_bulk(
if (mlip == lip)
mlip_changed = 1;
}
- spin_unlock(&ailp->xa_lock);
- if (mlip_changed && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
- xlog_assign_tail_lsn(ailp->xa_mount);
+ if (mlip_changed) {
+ if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
+ xlog_assign_tail_lsn_locked(ailp->xa_mount);
+ spin_unlock(&ailp->xa_lock);
+
xfs_log_space_wake(ailp->xa_mount);
+ } else {
+ spin_unlock(&ailp->xa_lock);
}
}
Index: xfs/fs/xfs/xfs_trans_priv.h
===================================================================
--- xfs.orig/fs/xfs/xfs_trans_priv.h 2012-03-16 12:44:55.943697253 +0100
+++ xfs/fs/xfs/xfs_trans_priv.h 2012-03-16 12:49:31.993702371 +0100
@@ -102,6 +102,7 @@ xfs_trans_ail_delete(
void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
void xfs_ail_push_all(struct xfs_ail *);
+struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
_______________________________________________
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^ permalink raw reply [flat|nested] 14+ messages in thread* [PATCH 4/4] xfs: implement freezing by emptying the AIL
2012-03-16 17:55 [PATCH 0/4] implement filesystem freezing by emptying the AIL Christoph Hellwig
` (2 preceding siblings ...)
2012-03-16 17:55 ` [PATCH 3/4] xfs: allow assigning the tail lsn with the AIL lock held Christoph Hellwig
@ 2012-03-16 17:55 ` Christoph Hellwig
2012-03-21 23:57 ` Dave Chinner
3 siblings, 1 reply; 14+ messages in thread
From: Christoph Hellwig @ 2012-03-16 17:55 UTC (permalink / raw)
To: xfs
[-- Attachment #1: xfs-empty-ail-on-freeze --]
[-- Type: text/plain, Size: 11490 bytes --]
Now that we write back all metadata either synchronously or through the AIL
we can simply implement metadata freezing in terms of emptying the AIL.
The implementation for this is fairly simply and straight-forward: A new
routine is added that increments a counter that tells xfsaild to not stop
until the AIL is empty and then waits on a wakeup from
xfs_trans_ail_delete_bulk to signal that the AIL is empty.
As usual the devil is in the details, in this case the filesystem shutdown
code. Currently we are a bit sloppy there and do not continue ail pushing
in that case, and thus never reach the code in the log item implementations
that can unwind in case of a shutdown filesystem. Also the code to
abort inode and dquot flushes was rather sloppy before and did not remove
the log items from the AIL, which had to be fixed as well.
Also treat unmount the same way as freeze now, except that we still keep a
synchronous inode reclaim pass to make sure we reclaim all clean inodes, too.
As an upside we can now remove the radix tree based inode writeback and
xfs_unmountfs_writesb.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_mount.c | 56 ++++++-----------------------
fs/xfs/xfs_mount.h | 1
fs/xfs/xfs_sync.c | 90 ++++--------------------------------------------
fs/xfs/xfs_trans_ail.c | 49 ++++++++++++++++++++++----
fs/xfs/xfs_trans_priv.h | 3 +
5 files changed, 65 insertions(+), 134 deletions(-)
Index: xfs/fs/xfs/xfs_sync.c
===================================================================
--- xfs.orig/fs/xfs/xfs_sync.c 2012-03-16 13:11:45.250393760 +0100
+++ xfs/fs/xfs/xfs_sync.c 2012-03-16 13:12:45.707061547 +0100
@@ -241,45 +241,6 @@ xfs_sync_inode_data(
return error;
}
-STATIC int
-xfs_sync_inode_attr(
- struct xfs_inode *ip,
- struct xfs_perag *pag,
- int flags)
-{
- int error = 0;
-
- xfs_ilock(ip, XFS_ILOCK_SHARED);
- if (xfs_inode_clean(ip))
- goto out_unlock;
- if (!xfs_iflock_nowait(ip)) {
- if (!(flags & SYNC_WAIT))
- goto out_unlock;
- xfs_iflock(ip);
- }
-
- if (xfs_inode_clean(ip)) {
- xfs_ifunlock(ip);
- goto out_unlock;
- }
-
- error = xfs_iflush(ip, flags);
-
- /*
- * We don't want to try again on non-blocking flushes that can't run
- * again immediately. If an inode really must be written, then that's
- * what the SYNC_WAIT flag is for.
- */
- if (error == EAGAIN) {
- ASSERT(!(flags & SYNC_WAIT));
- error = 0;
- }
-
- out_unlock:
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- return error;
-}
-
/*
* Write out pagecache data for the whole filesystem.
*/
@@ -300,19 +261,6 @@ xfs_sync_data(
return 0;
}
-/*
- * Write out inode metadata (attributes) for the whole filesystem.
- */
-STATIC int
-xfs_sync_attr(
- struct xfs_mount *mp,
- int flags)
-{
- ASSERT((flags & ~SYNC_WAIT) == 0);
-
- return xfs_inode_ag_iterator(mp, xfs_sync_inode_attr, flags);
-}
-
STATIC int
xfs_sync_fsdata(
struct xfs_mount *mp)
@@ -379,33 +327,6 @@ xfs_quiesce_data(
return error ? error : error2;
}
-STATIC void
-xfs_quiesce_fs(
- struct xfs_mount *mp)
-{
- int count = 0, pincount;
-
- xfs_reclaim_inodes(mp, 0);
- xfs_flush_buftarg(mp->m_ddev_targp, 0);
-
- /*
- * This loop must run at least twice. The first instance of the loop
- * will flush most meta data but that will generate more meta data
- * (typically directory updates). Which then must be flushed and
- * logged before we can write the unmount record. We also so sync
- * reclaim of inodes to catch any that the above delwri flush skipped.
- */
- do {
- xfs_reclaim_inodes(mp, SYNC_WAIT);
- xfs_sync_attr(mp, SYNC_WAIT);
- pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
- if (!pincount) {
- delay(50);
- count++;
- }
- } while (count < 2);
-}
-
/*
* Second stage of a quiesce. The data is already synced, now we have to take
* care of the metadata. New transactions are already blocked, so we need to
@@ -421,8 +342,8 @@ xfs_quiesce_attr(
while (atomic_read(&mp->m_active_trans) > 0)
delay(100);
- /* flush inodes and push all remaining buffers out to disk */
- xfs_quiesce_fs(mp);
+ /* flush all pending changes from the AIL */
+ xfs_ail_push_all_sync(mp->m_ail);
/*
* Just warn here till VFS can correctly support
@@ -436,7 +357,12 @@ xfs_quiesce_attr(
xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
"Frozen image may not be consistent.");
xfs_log_unmount_write(mp);
- xfs_unmountfs_writesb(mp);
+
+ /*
+ * At this point we might have modified the superblock again and thus
+ * added an item to the AIL, thus flush it again.
+ */
+ xfs_ail_push_all_sync(mp->m_ail);
}
static void
Index: xfs/fs/xfs/xfs_trans_ail.c
===================================================================
--- xfs.orig/fs/xfs/xfs_trans_ail.c 2012-03-16 13:11:45.880393771 +0100
+++ xfs/fs/xfs/xfs_trans_ail.c 2012-03-16 13:13:37.923729183 +0100
@@ -383,9 +383,8 @@ xfsaild_push(
spin_lock(&ailp->xa_lock);
}
- target = ailp->xa_target;
lip = xfs_trans_ail_cursor_first(ailp, &cur, ailp->xa_last_pushed_lsn);
- if (!lip || XFS_FORCED_SHUTDOWN(mp)) {
+ if (!lip) {
/*
* AIL is empty or our push has reached the end.
*/
@@ -397,6 +396,15 @@ xfsaild_push(
XFS_STATS_INC(xs_push_ail);
/*
+ * If we are draining the AIL push all items, not just the current
+ * threshold.
+ */
+ if (atomic_read(&ailp->xa_wait_empty))
+ target = xfs_ail_max(ailp)->li_lsn;
+ else
+ target = ailp->xa_target;
+
+ /*
* While the item we are looking at is below the given threshold
* try to flush it out. We'd like not to stop until we've at least
* tried to push on everything in the AIL with an LSN less than
@@ -466,11 +474,6 @@ xfsaild_push(
}
spin_lock(&ailp->xa_lock);
- /* should we bother continuing? */
- if (XFS_FORCED_SHUTDOWN(mp))
- break;
- ASSERT(mp->m_log);
-
count++;
/*
@@ -611,6 +614,34 @@ xfs_ail_push_all(
}
/*
+ * Push out all items in the AIL immediately and wait until the AIL is empty.
+ */
+void
+xfs_ail_push_all_sync(
+ struct xfs_ail *ailp)
+{
+ DEFINE_WAIT(wait);
+
+ /*
+ * We use a counter instead of a flag here to support multiple
+ * processes calling into sync at the same time.
+ */
+ atomic_inc(&ailp->xa_wait_empty);
+ do {
+ prepare_to_wait(&ailp->xa_empty, &wait, TASK_KILLABLE);
+
+ wake_up_process(ailp->xa_task);
+
+ if (!xfs_ail_min_lsn(ailp))
+ break;
+ schedule();
+ } while (xfs_ail_min_lsn(ailp) && !fatal_signal_pending(current));
+ atomic_dec(&ailp->xa_wait_empty);
+
+ finish_wait(&ailp->xa_empty, &wait);
+}
+
+/*
* xfs_trans_ail_update - bulk AIL insertion operation.
*
* @xfs_trans_ail_update takes an array of log items that all need to be
@@ -737,6 +768,8 @@ xfs_trans_ail_delete_bulk(
if (mlip_changed) {
if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
xlog_assign_tail_lsn_locked(ailp->xa_mount);
+ if (list_empty(&ailp->xa_ail))
+ wake_up_all(&ailp->xa_empty);
spin_unlock(&ailp->xa_lock);
xfs_log_space_wake(ailp->xa_mount);
@@ -773,6 +806,8 @@ xfs_trans_ail_init(
INIT_LIST_HEAD(&ailp->xa_ail);
INIT_LIST_HEAD(&ailp->xa_cursors);
spin_lock_init(&ailp->xa_lock);
+ init_waitqueue_head(&ailp->xa_empty);
+ atomic_set(&ailp->xa_wait_empty, 0);
ailp->xa_task = kthread_run(xfsaild, ailp, "xfsaild/%s",
ailp->xa_mount->m_fsname);
Index: xfs/fs/xfs/xfs_trans_priv.h
===================================================================
--- xfs.orig/fs/xfs/xfs_trans_priv.h 2012-03-16 13:11:45.880393771 +0100
+++ xfs/fs/xfs/xfs_trans_priv.h 2012-03-16 13:12:45.707061547 +0100
@@ -71,6 +71,8 @@ struct xfs_ail {
spinlock_t xa_lock;
xfs_lsn_t xa_last_pushed_lsn;
int xa_log_flush;
+ wait_queue_head_t xa_empty;
+ atomic_t xa_wait_empty;
};
/*
@@ -102,6 +104,7 @@ xfs_trans_ail_delete(
void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
void xfs_ail_push_all(struct xfs_ail *);
+void xfs_ail_push_all_sync(struct xfs_ail *);
struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
Index: xfs/fs/xfs/xfs_mount.c
===================================================================
--- xfs.orig/fs/xfs/xfs_mount.c 2012-03-16 13:10:40.357059223 +0100
+++ xfs/fs/xfs/xfs_mount.c 2012-03-16 13:12:45.710394881 +0100
@@ -22,6 +22,7 @@
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
@@ -1475,15 +1476,15 @@ xfs_unmountfs(
xfs_log_force(mp, XFS_LOG_SYNC);
/*
- * Do a delwri reclaim pass first so that as many dirty inodes are
- * queued up for IO as possible. Then flush the buffers before making
- * a synchronous path to catch all the remaining inodes are reclaimed.
- * This makes the reclaim process as quick as possible by avoiding
- * synchronous writeout and blocking on inodes already in the delwri
- * state as much as possible.
+ * Flush all pending changes from the AIL.
+ */
+ xfs_ail_push_all_sync(mp->m_ail);
+
+ /*
+ * And reclaim all inodes. At this point there should be no dirty
+ * inode, and none should be pinned or locked, but use synchronous
+ * reclaim just to be sure.
*/
- xfs_reclaim_inodes(mp, 0);
- xfs_flush_buftarg(mp->m_ddev_targp, 1);
xfs_reclaim_inodes(mp, SYNC_WAIT);
xfs_qm_unmount(mp);
@@ -1519,15 +1520,12 @@ xfs_unmountfs(
if (error)
xfs_warn(mp, "Unable to update superblock counters. "
"Freespace may not be correct on next mount.");
- xfs_unmountfs_writesb(mp);
/*
- * Make sure all buffers have been flushed and completed before
- * unmounting the log.
+ * At this point we might have modified the superblock again and thus
+ * added an item to the AIL, thus flush it again.
*/
- error = xfs_flush_buftarg(mp->m_ddev_targp, 1);
- if (error)
- xfs_warn(mp, "%d busy buffers during unmount.", error);
+ xfs_ail_push_all_sync(mp->m_ail);
xfs_wait_buftarg(mp->m_ddev_targp);
xfs_log_unmount_write(mp);
@@ -1588,36 +1586,6 @@ xfs_log_sbcount(xfs_mount_t *mp)
return error;
}
-int
-xfs_unmountfs_writesb(xfs_mount_t *mp)
-{
- xfs_buf_t *sbp;
- int error = 0;
-
- /*
- * skip superblock write if fs is read-only, or
- * if we are doing a forced umount.
- */
- if (!((mp->m_flags & XFS_MOUNT_RDONLY) ||
- XFS_FORCED_SHUTDOWN(mp))) {
-
- sbp = xfs_getsb(mp, 0);
-
- XFS_BUF_UNDONE(sbp);
- XFS_BUF_UNREAD(sbp);
- xfs_buf_delwri_dequeue(sbp);
- XFS_BUF_WRITE(sbp);
- XFS_BUF_UNASYNC(sbp);
- ASSERT(sbp->b_target == mp->m_ddev_targp);
- xfsbdstrat(mp, sbp);
- error = xfs_buf_iowait(sbp);
- if (error)
- xfs_buf_ioerror_alert(sbp, __func__);
- xfs_buf_relse(sbp);
- }
- return error;
-}
-
/*
* xfs_mod_sb() can be used to copy arbitrary changes to the
* in-core superblock into the superblock buffer to be logged.
Index: xfs/fs/xfs/xfs_mount.h
===================================================================
--- xfs.orig/fs/xfs/xfs_mount.h 2012-03-16 13:10:40.373725891 +0100
+++ xfs/fs/xfs/xfs_mount.h 2012-03-16 13:12:45.710394881 +0100
@@ -378,7 +378,6 @@ extern __uint64_t xfs_default_resblks(xf
extern int xfs_mountfs(xfs_mount_t *mp);
extern void xfs_unmountfs(xfs_mount_t *);
-extern int xfs_unmountfs_writesb(xfs_mount_t *);
extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
extern int xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
uint, int);
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