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xfs: Properly retry failed inode items in case of error during buffer writeback

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When a buffer has been failed during writeback, the inode items into it
are kept flush locked, and are never resubmitted due the flush lock, so,
if any buffer fails to be written, the items in AIL are never written to
disk and never unlocked.

This causes unmount operation to hang due these items flush locked in AIL,
but this also causes the items in AIL to never be written back, even when
the IO device comes back to normal.

I've been testing this patch with a DM-thin device, creating a
filesystem larger than the real device.

When writing enough data to fill the DM-thin device, XFS receives ENOSPC
errors from the device, and keep spinning on xfsaild (when 'retry
forever' configuration is set).

At this point, the filesystem can not be unmounted because of the flush locked
items in AIL, but worse, the items in AIL are never retried at all
(once xfs_inode_item_push() will skip the items that are flush locked),
even if the underlying DM-thin device is expanded to the proper size.

This patch fixes both cases, retrying any item that has been failed
previously, using the infra-structure provided by the previous patch.

Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Carlos Maiolino
2017-08-08 18:21:50 -07:00
committed by Darrick J. Wong
parent 0b80ae6ed1
commit d3a304b629
6 changed files with 108 additions and 5 deletions
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31
fs/xfs/xfs_trans_priv.h
View File

@@ -164,4 +164,35 @@ xfs_trans_ail_copy_lsn(
*dst = *src;
}
#endif
static inline void
xfs_clear_li_failed(
struct xfs_log_item *lip)
{
struct xfs_buf *bp = lip->li_buf;
ASSERT(lip->li_flags & XFS_LI_IN_AIL);
lockdep_assert_held(&lip->li_ailp->xa_lock);
if (lip->li_flags & XFS_LI_FAILED) {
lip->li_flags &= ~XFS_LI_FAILED;
lip->li_buf = NULL;
xfs_buf_rele(bp);
}
}
static inline void
xfs_set_li_failed(
struct xfs_log_item *lip,
struct xfs_buf *bp)
{
lockdep_assert_held(&lip->li_ailp->xa_lock);
if (!(lip->li_flags & XFS_LI_FAILED)) {
xfs_buf_hold(bp);
lip->li_flags |= XFS_LI_FAILED;
lip->li_buf = bp;
}
}
#endif /* __XFS_TRANS_PRIV_H__ */