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authorDave Chinner <david@fromorbit.com>2010-03-12 09:42:16 +1100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-04-26 07:41:16 -0700
commite52af5078f958b84f5ca2f06f692f96438d82d84 (patch)
tree706193070335293f6b690ca103af4b95385c2533 /fs
parent76962b5ed721dd91bd736c65944522798a35ced5 (diff)
downloadlwn-e52af5078f958b84f5ca2f06f692f96438d82d84.tar.gz
lwn-e52af5078f958b84f5ca2f06f692f96438d82d84.zip
xfs: Non-blocking inode locking in IO completion
commit 77d7a0c2eeb285c9069e15396703d0cb9690ac50 upstream The introduction of barriers to loop devices has created a new IO order completion dependency that XFS does not handle. The loop device implements barriers using fsync and so turns a log IO in the XFS filesystem on the loop device into a data IO in the backing filesystem. That is, the completion of log IOs in the loop filesystem are now dependent on completion of data IO in the backing filesystem. This can cause deadlocks when a flush daemon issues a log force with an inode locked because the IO completion of IO on the inode is blocked by the inode lock. This in turn prevents further data IO completion from occuring on all XFS filesystems on that CPU (due to the shared nature of the completion queues). This then prevents the log IO from completing because the log is waiting for data IO completion as well. The fix for this new completion order dependency issue is to make the IO completion inode locking non-blocking. If the inode lock can't be grabbed, simply requeue the IO completion back to the work queue so that it can be processed later. This prevents the completion queue from being blocked and allows data IO completion on other inodes to proceed, hence avoiding completion order dependent deadlocks. Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/linux-2.6/xfs_aops.c118
1 files changed, 82 insertions, 36 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index c2e30eea74dc..7263002fac64 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -204,14 +204,17 @@ xfs_ioend_new_eof(
}
/*
- * Update on-disk file size now that data has been written to disk.
- * The current in-memory file size is i_size. If a write is beyond
- * eof i_new_size will be the intended file size until i_size is
- * updated. If this write does not extend all the way to the valid
- * file size then restrict this update to the end of the write.
+ * Update on-disk file size now that data has been written to disk. The
+ * current in-memory file size is i_size. If a write is beyond eof i_new_size
+ * will be the intended file size until i_size is updated. If this write does
+ * not extend all the way to the valid file size then restrict this update to
+ * the end of the write.
+ *
+ * This function does not block as blocking on the inode lock in IO completion
+ * can lead to IO completion order dependency deadlocks.. If it can't get the
+ * inode ilock it will return EAGAIN. Callers must handle this.
*/
-
-STATIC void
+STATIC int
xfs_setfilesize(
xfs_ioend_t *ioend)
{
@@ -222,9 +225,11 @@ xfs_setfilesize(
ASSERT(ioend->io_type != IOMAP_READ);
if (unlikely(ioend->io_error))
- return;
+ return 0;
+
+ if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
+ return EAGAIN;
- xfs_ilock(ip, XFS_ILOCK_EXCL);
isize = xfs_ioend_new_eof(ioend);
if (isize) {
ip->i_d.di_size = isize;
@@ -232,6 +237,28 @@ xfs_setfilesize(
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return 0;
+}
+
+/*
+ * Schedule IO completion handling on a xfsdatad if this was
+ * the final hold on this ioend. If we are asked to wait,
+ * flush the workqueue.
+ */
+STATIC void
+xfs_finish_ioend(
+ xfs_ioend_t *ioend,
+ int wait)
+{
+ if (atomic_dec_and_test(&ioend->io_remaining)) {
+ struct workqueue_struct *wq;
+
+ wq = (ioend->io_type == IOMAP_UNWRITTEN) ?
+ xfsconvertd_workqueue : xfsdatad_workqueue;
+ queue_work(wq, &ioend->io_work);
+ if (wait)
+ flush_workqueue(wq);
+ }
}
/*
@@ -243,9 +270,23 @@ xfs_end_bio_delalloc(
{
xfs_ioend_t *ioend =
container_of(work, xfs_ioend_t, io_work);
+ int error;
- xfs_setfilesize(ioend);
- xfs_destroy_ioend(ioend);
+ /*
+ * If we didn't complete processing of the ioend, requeue it to the
+ * tail of the workqueue for another attempt later. Otherwise destroy
+ * it.
+ */
+ error = xfs_setfilesize(ioend);
+ if (error == EAGAIN) {
+ atomic_inc(&ioend->io_remaining);
+ xfs_finish_ioend(ioend, 0);
+ /* ensure we don't spin on blocked ioends */
+ delay(1);
+ } else {
+ ASSERT(!error);
+ xfs_destroy_ioend(ioend);
+ }
}
/*
@@ -257,9 +298,23 @@ xfs_end_bio_written(
{
xfs_ioend_t *ioend =
container_of(work, xfs_ioend_t, io_work);
+ int error;
- xfs_setfilesize(ioend);
- xfs_destroy_ioend(ioend);
+ /*
+ * If we didn't complete processing of the ioend, requeue it to the
+ * tail of the workqueue for another attempt later. Otherwise destroy
+ * it.
+ */
+ error = xfs_setfilesize(ioend);
+ if (error == EAGAIN) {
+ atomic_inc(&ioend->io_remaining);
+ xfs_finish_ioend(ioend, 0);
+ /* ensure we don't spin on blocked ioends */
+ delay(1);
+ } else {
+ ASSERT(!error);
+ xfs_destroy_ioend(ioend);
+ }
}
/*
@@ -279,13 +334,25 @@ xfs_end_bio_unwritten(
size_t size = ioend->io_size;
if (likely(!ioend->io_error)) {
+ int error;
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
- int error;
error = xfs_iomap_write_unwritten(ip, offset, size);
if (error)
ioend->io_error = error;
}
- xfs_setfilesize(ioend);
+ /*
+ * If we didn't complete processing of the ioend, requeue it to the
+ * tail of the workqueue for another attempt later. Otherwise destroy
+ * it.
+ */
+ error = xfs_setfilesize(ioend);
+ if (error == EAGAIN) {
+ atomic_inc(&ioend->io_remaining);
+ xfs_finish_ioend(ioend, 0);
+ /* ensure we don't spin on blocked ioends */
+ delay(1);
+ return;
+ }
}
xfs_destroy_ioend(ioend);
}
@@ -304,27 +371,6 @@ xfs_end_bio_read(
}
/*
- * Schedule IO completion handling on a xfsdatad if this was
- * the final hold on this ioend. If we are asked to wait,
- * flush the workqueue.
- */
-STATIC void
-xfs_finish_ioend(
- xfs_ioend_t *ioend,
- int wait)
-{
- if (atomic_dec_and_test(&ioend->io_remaining)) {
- struct workqueue_struct *wq = xfsdatad_workqueue;
- if (ioend->io_work.func == xfs_end_bio_unwritten)
- wq = xfsconvertd_workqueue;
-
- queue_work(wq, &ioend->io_work);
- if (wait)
- flush_workqueue(wq);
- }
-}
-
-/*
* Allocate and initialise an IO completion structure.
* We need to track unwritten extent write completion here initially.
* We'll need to extend this for updating the ondisk inode size later