diff options
| author | David Chinner <dgc@sgi.com> | 2007-05-14 18:24:23 +1000 |
|---|---|---|
| committer | Tim Shimmin <tes@chook.melbourne.sgi.com> | 2007-10-15 16:23:45 +1000 |
| commit | 0bfefc46dc028df60120acdb92062169c9328769 (patch) | |
| tree | ce8cecb3f4546300c0d193efa27bf14f78170b3b /fs/xfs/xfs_log.c | |
| parent | c1561cf463f4a480d1960e833c8fe628207b24e4 (diff) | |
[XFS] Barriers need to be dynamically checked and switched off
If the underlying block device suddenly stops supporting barriers, we need
to handle the -EOPNOTSUPP error in a sane manner rather than shutting
down the filesystem. If we get this error, clear the barrier flag, reissue
the I/O, and tell the world bad things are occurring.
SGI-PV: 964544
SGI-Modid: xfs-linux-melb:xfs-kern:28568a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log.c')
| -rw-r--r-- | fs/xfs/xfs_log.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 9bfb69e1e885..db09e1ea5cf3 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -949,6 +949,19 @@ xlog_iodone(xfs_buf_t *bp) l = iclog->ic_log; /* + * If the ordered flag has been removed by a lower + * layer, it means the underlyin device no longer supports + * barrier I/O. Warn loudly and turn off barriers. + */ + if ((l->l_mp->m_flags & XFS_MOUNT_BARRIER) && !XFS_BUF_ORDERED(bp)) { + l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; + xfs_fs_cmn_err(CE_WARN, l->l_mp, + "xlog_iodone: Barriers are no longer supported" + " by device. Disabling barriers\n"); + xfs_buftrace("XLOG_IODONE BARRIERS OFF", bp); + } + + /* * Race to shutdown the filesystem if we see an error. */ if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, |