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xfs: minor cleanup for xfs_reflink_end_cow 

Use xfs_iext_prev_extent to skip to the previous extent instead of
opencoding it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-03-13 23:15:33 -07:00 committed by Darrick J. Wong
parent 1d4352de51
commit df79b81b2e
1 changed files with 8 additions and 9 deletions
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17
fs/xfs/xfs_reflink.c
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@ -762,10 +762,8 @@ xfs_reflink_end_cow(
xfs_trim_extent(&del, offset_fsb, end_fsb - offset_fsb);
/* Extent delete may have bumped ext forward */
if (!del.br_blockcount) {
xfs_iext_prev(ifp, &icur);
goto next_extent;
}
if (!del.br_blockcount)
goto prev_extent;
ASSERT(!isnullstartblock(got.br_startblock));
@ -774,10 +772,8 @@ xfs_reflink_end_cow(
* speculatively preallocated CoW extents that have been
* allocated but have not yet been involved in a write.
*/
if (got.br_state == XFS_EXT_UNWRITTEN) {
xfs_iext_prev(ifp, &icur);
goto next_extent;
}
if (got.br_state == XFS_EXT_UNWRITTEN)
goto prev_extent;
/* Unmap the old blocks in the data fork. */
xfs_defer_init(&dfops, &firstfsb);
@ -816,9 +812,12 @@ xfs_reflink_end_cow(
error = xfs_defer_finish(&tp, &dfops);
if (error)
goto out_defer;
next_extent:
if (!xfs_iext_get_extent(ifp, &icur, &got))
break;
continue;
prev_extent:
if (!xfs_iext_prev_extent(ifp, &icur, &got))
break;
}
error = xfs_trans_commit(tp);