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xfs: remove isize check from unshare operation

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Now that fallocate has an explicit unshare flag again, let's try
to remove the inode reflink flag whenever the user unshares any
part of a file since checking is cheap compared to the CoW.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reported-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-10-10 16:49:01 +11:00 committed by Dave Chinner
parent 024adf4870
commit 97a1b87ea7
1 changed files with 6 additions and 12 deletions
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18
fs/xfs/xfs_reflink.c
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@ -1570,8 +1570,7 @@ next:
*/
STATIC int
xfs_reflink_try_clear_inode_flag(
struct xfs_inode *ip,
xfs_off_t old_isize)
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
@ -1585,9 +1584,6 @@ xfs_reflink_try_clear_inode_flag(
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);
if (old_isize != i_size_read(VFS_I(ip)))
goto cancel;
error = xfs_reflink_clear_inode_flag(ip, &tp);
if (error)
goto cancel;
@ -1630,7 +1626,7 @@ xfs_reflink_unshare(
/* Try to CoW the selected ranges */
xfs_ilock(ip, XFS_ILOCK_EXCL);
fbno = XFS_B_TO_FSB(mp, offset);
fbno = XFS_B_TO_FSBT(mp, offset);
isize = i_size_read(VFS_I(ip));
end = XFS_B_TO_FSB(mp, offset + len);
error = xfs_reflink_dirty_extents(ip, fbno, end, isize);
@ -1643,12 +1639,10 @@ xfs_reflink_unshare(
if (error)
goto out;
/* Turn off the reflink flag if we unshared the whole file */
if (offset == 0 && len == isize) {
error = xfs_reflink_try_clear_inode_flag(ip, isize);
if (error)
goto out;
}
/* Turn off the reflink flag if possible. */
error = xfs_reflink_try_clear_inode_flag(ip);
if (error)
goto out;
return 0;