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[XFS] write barrier support Issue all log sync operations as ordered

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writes.  In addition flush the disk cache on fsync if the sync cached
operation didn't sync the log to disk (this requires some additional
bookeping in the transaction and log code). If the device doesn't claim to
support barriers, the filesystem has an extern log volume or the trial
superblock write with barriers enabled failed we disable barriers and
print a warning.  We should probably fail the mount completely, but that
could lead to nasty boot failures for the root filesystem.  Not enabled by
default yet, needs more destructive testing first.

SGI-PV: 912426
SGI-Modid: xfs-linux:xfs-kern:198723a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Christoph Hellwig 2005-11-02 10:26:59 +11:00 • committed by Nathan Scott
parent 739cafd316
commit f538d4da8d
12 changed files with 190 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

32
fs/xfs/xfs_vnodeops.c
View file

@ -1118,6 +1118,7 @@ xfs_fsync(
xfs_inode_t *ip;
xfs_trans_t *tp;
int error;
int log_flushed = 0, changed = 1;
vn_trace_entry(BHV_TO_VNODE(bdp),
__FUNCTION__, (inst_t *)__return_address);
@ -1171,10 +1172,18 @@ xfs_fsync(
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (xfs_ipincount(ip)) {
xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
_xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
XFS_LOG_FORCE |
((flag & FSYNC_WAIT)
? XFS_LOG_SYNC : 0));
? XFS_LOG_SYNC : 0),
&log_flushed);
} else {
/*
* If the inode is not pinned and nothing
* has changed we don't need to flush the
* cache.
*/
changed = 0;
}
error = 0;
} else {
@ -1210,10 +1219,27 @@ xfs_fsync(
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
if (flag & FSYNC_WAIT)
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp, 0, NULL);
error = _xfs_trans_commit(tp, 0, NULL, &log_flushed);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
/*
* If the log write didn't issue an ordered tag we need
* to flush the disk cache for the data device now.
*/
if (!log_flushed)
xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
/*
* If this inode is on the RT dev we need to flush that
* cache aswell.
*/
if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
}
return error;
}