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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
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3
fs/xfs/xfs_mount.h
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@ -415,7 +415,7 @@ typedef struct xfs_mount {
* 32 bits in size */
#define XFS_MOUNT_32BITINOOPT 0x00008000 /* saved mount option state */
#define XFS_MOUNT_NOUUID 0x00010000 /* ignore uuid during mount */
#define XFS_MOUNT_NOLOGFLUSH 0x00020000
#define XFS_MOUNT_BARRIER 0x00020000
#define XFS_MOUNT_IDELETE 0x00040000 /* delete empty inode clusters*/
#define XFS_MOUNT_SWALLOC 0x00080000 /* turn on stripe width
* allocation */
@ -542,6 +542,7 @@ extern xfs_mount_t *xfs_mount_init(void);
extern void xfs_mod_sb(xfs_trans_t *, __int64_t);
extern void xfs_mount_free(xfs_mount_t *mp, int remove_bhv);
extern int xfs_mountfs(struct vfs *, xfs_mount_t *mp, int);
extern void xfs_mountfs_check_barriers(xfs_mount_t *mp);
extern int xfs_unmountfs(xfs_mount_t *, struct cred *);
extern void xfs_unmountfs_close(xfs_mount_t *, struct cred *);