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@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Allison Collins <allison.henderson@xxxxxxxxxx>
---
v4.1:
- Add comment to document dependency on external permanent error
processing.
fs/xfs/xfs_buf.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 594d5e1df6f8..3918270f4eab 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -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
--
2.21.1
