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xfs: ratelimit unmount time per-buffer I/O error alert 

At unmount time, XFS emits an alert for every in-core buffer that
might have undergone a write error. In practice this behavior is
probably reasonable given that the filesystem is likely short lived
once I/O errors begin to occur consistently. Under certain test or
otherwise expected error conditions, this can spam the logs and slow
down the unmount.

Now that we have a ratelimit mechanism specifically for buffer
alerts, reuse it for the per-buffer alerts in xfs_wait_buftarg().
Also lift the final repair message out of the loop so it always
prints and assert that the metadata error handling code has shut
down the fs.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2020-05-06 13:25:21 -07:00 committed by Darrick J. Wong
parent f9bccfcc3b
commit 61948b6fb2
1 changed files with 17 additions and 4 deletions
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21
fs/xfs/xfs_buf.c
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@ -1657,7 +1657,8 @@ xfs_wait_buftarg(
struct xfs_buftarg *btp)
{
LIST_HEAD(dispose);
int loop = 0;
int loop = 0;
bool write_fail = false;
/*
* First wait on the buftarg I/O count for all in-flight buffers to be
@ -1685,17 +1686,29 @@ xfs_wait_buftarg(
bp = list_first_entry(&dispose, struct xfs_buf, b_lru);
list_del_init(&bp->b_lru);
if (bp->b_flags & XBF_WRITE_FAIL) {
xfs_alert(btp->bt_mount,
write_fail = true;
xfs_buf_alert_ratelimited(bp,
"XFS: Corruption Alert",
"Corruption Alert: Buffer at daddr 0x%llx had permanent write failures!",
(long long)bp->b_bn);
xfs_alert(btp->bt_mount,
"Please run xfs_repair to determine the extent of the problem.");
}
xfs_buf_rele(bp);
}
if (loop++ != 0)
delay(100);
}
/*
* If one or more failed buffers were freed, that means dirty metadata
* was thrown away. This should only ever happen after I/O completion
* handling has elevated I/O error(s) to permanent failures and shuts
* down the fs.
*/
if (write_fail) {
ASSERT(XFS_FORCED_SHUTDOWN(btp->bt_mount));
xfs_alert(btp->bt_mount,
"Please run xfs_repair to determine the extent of the problem.");
}
}
static enum lru_status