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[XFS] Make hole punching at EOF atomic.

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If hole punching at EOF is done as two steps (i.e. truncate then extend)
the file is in a transient state between the two steps where an
application can see the incorrect file size. Punching a hole to EOF needs
to be treated in teh same way as all other hole punching cases so that the
file size is never seen to change.

SGI-PV: 962012
SGI-Modid: xfs-linux-melb:xfs-kern:28641a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Vlad Apostolov <vapo@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
David Chinner
2007-05-24 15:22:19 +10:00
committed by Tim Shimmin
parent 511105b3d7
commit 92dfe8d266
2 changed files with 29 additions and 13 deletions
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14
fs/xfs/xfs_rw.h
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@@ -71,6 +71,12 @@ xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
}
/*
* Flags for xfs_free_eofblocks
*/
#define XFS_FREE_EOF_LOCK (1<<0)
#define XFS_FREE_EOF_NOLOCK (1<<1)
/*
* Prototypes for functions in xfs_rw.c.
*/
@@ -91,10 +97,12 @@ extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
extern int xfs_rwlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
extern int xfs_setattr(bhv_desc_t *, bhv_vattr_t *vap, int flags,
cred_t *credp);
cred_t *credp);
extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
xfs_off_t offset, cred_t *credp, int flags);
xfs_off_t offset, cred_t *credp, int flags);
extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
cred_t *credp);
cred_t *credp);
extern int xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
int flags);
#endif /* __XFS_RW_H__ */