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xfs: cancel intents immediately if process_intents fails 

If processing recovered log intent items fails, we need to cancel all
the unprocessed recovered items immediately so that a subsequent AIL
push in the bail out path won't get wedged on the pinned intent items
that didn't get processed.

This can happen if the log contains (1) an intent that gets and releases
an inode, (2) an intent that cannot be recovered successfully, and (3)
some third intent item.  When recovery of (2) fails, we leave (3) pinned
in memory.  Inode reclamation is called in the error-out path of
xfs_mountfs before xfs_log_cancel_mount.  Reclamation calls
xfs_ail_push_all_sync, which gets stuck waiting for (3).

Therefore, call xlog_recover_cancel_intents if _process_intents fails.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-10-19 09:28:02 -07:00
parent 25219dbfa7
commit 2e76f188fd
1 changed files with 8 additions and 0 deletions
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8
fs/xfs/xfs_log_recover.c
View File

@ -3446,6 +3446,14 @@ xlog_recover_finish(
int error;
error = xlog_recover_process_intents(log);
if (error) {
/*
* Cancel all the unprocessed intent items now so that
* we don't leave them pinned in the AIL. This can
* cause the AIL to livelock on the pinned item if
* anyone tries to push the AIL (inode reclaim does
* this) before we get around to xfs_log_mount_cancel.
*/
xlog_recover_cancel_intents(log);
xfs_alert(log->l_mp, "Failed to recover intents");
return error;
}