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| author | Christoph Hellwig <hch@lst.de> | 2017-10-23 16:32:39 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-26 15:38:28 -0700 |
| commit | dc56015faff1bc9e7493c2b28302c423a02237c2 (patch) | |
| tree | b929e2deb6b55e0aa0df4bb1ccda6d1eb808a3aa /fs/xfs/xfs_reflink.c | |
| parent | 211e95bbab71359e56f3d9adce1b4d6de8e18471 (diff) | |
| download | linux-dc56015faff1bc9e7493c2b28302c423a02237c2.tar.gz linux-dc56015faff1bc9e7493c2b28302c423a02237c2.tar.bz2 linux-dc56015faff1bc9e7493c2b28302c423a02237c2.zip | |
xfs: add a new xfs_iext_lookup_extent_before helper
This helper looks up the last extent the covers space before the passed
in block number. This is useful for truncate and similar operations that
operate backwards over the extent list. For xfs_bunmapi it also is
a slight optimization as we can return early if there are not extents
at or below the end of the to be truncated range.
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>
Diffstat (limited to 'fs/xfs/xfs_reflink.c')
| -rw-r--r-- | fs/xfs/xfs_reflink.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 37e603bf1591..1205747e1409 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -733,18 +733,13 @@ xfs_reflink_end_cow( xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, 0); - /* If there is a hole at end_fsb - 1 go to the previous extent */ - if (!xfs_iext_lookup_extent(ip, ifp, end_fsb - 1, &idx, &got) || - got.br_startoff > end_fsb) { - /* - * In case of racing, overlapping AIO writes no COW extents - * might be left by the time I/O completes for the loser of - * the race. In that case we are done. - */ - if (idx <= 0) - goto out_cancel; - xfs_iext_get_extent(ifp, --idx, &got); - } + /* + * In case of racing, overlapping AIO writes no COW extents might be + * left by the time I/O completes for the loser of the race. In that + * case we are done. + */ + if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &idx, &got)) + goto out_cancel; /* Walk backwards until we're out of the I/O range... */ while (got.br_startoff + got.br_blockcount > offset_fsb) { |