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authorChristoph Hellwig <hch@lst.de>2009-08-31 20:00:31 -0400
committerFelix Blyakher <felixb@sgi.com>2009-09-01 13:45:57 -0400
commit13e6d5cdde0e785aa943810f08b801cadd0935df (patch)
tree72b62d1e3e4b35f1613458b6e1dbbadd74534a92 /fs/xfs/xfs_rw.h
parentbd169565993b39b9b4b102cdac8b13e0a259ce2f (diff)
xfs: merge fsync and O_SYNC handling
The guarantees for O_SYNC are exactly the same as the ones we need to make for an fsync call (and given that Linux O_SYNC is O_DSYNC the equivalent is fdadatasync, but we treat both the same in XFS), except with a range data writeout. Jan Kara has started unifying these two path for filesystems using the generic helpers, and I've started to look at XFS. The actual transaction commited by xfs_fsync and xfs_write_sync_logforce has a different transaction number, but actually is exactly the same. We'll only use the fsync transaction going forward. One major difference is that xfs_write_sync_logforce never issues a cache flush unless we commit a transaction causing that as a side-effect, which is an obvious bug in the O_SYNC handling. Second all the locking and i_update_size vs i_update_core changes from 978b7237123d007b9fa983af6e0e2fa8f97f9934 never made it to xfs_write_sync_logforce, so we add them back. To make xfs_fsync easily usable from the O_SYNC path, the filemap_fdatawait call is moved up to xfs_file_fsync, so that we don't wait on the whole file after we already waited for our portion in xfs_write. We'll also use a plain call to filemap_write_and_wait_range instead of the previous sync_page_rang which did it in two steps including an half-hearted inode write out that doesn't help us. Once we're done with this also remove the now useless i_update_size tracking. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Felix Blyakher <felixb@sgi.com> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_rw.h')
-rw-r--r--fs/xfs/xfs_rw.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
index ae65f0df87da..f5e4874c37d8 100644
--- a/fs/xfs/xfs_rw.h
+++ b/fs/xfs/xfs_rw.h
@@ -68,7 +68,6 @@ xfs_get_extsz_hint(
68 * Prototypes for functions in xfs_rw.c. 68 * Prototypes for functions in xfs_rw.c.
69 */ 69 */
70extern int xfs_write_clear_setuid(struct xfs_inode *ip); 70extern int xfs_write_clear_setuid(struct xfs_inode *ip);
71extern int xfs_write_sync_logforce(struct xfs_mount *mp, struct xfs_inode *ip);
72extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp); 71extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
73extern int xfs_bioerror(struct xfs_buf *bp); 72extern int xfs_bioerror(struct xfs_buf *bp);
74extern int xfs_bioerror_relse(struct xfs_buf *bp); 73extern int xfs_bioerror_relse(struct xfs_buf *bp);