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authorChristoph Hellwig <hch@lst.de>2018-06-21 23:24:38 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-06-21 23:24:38 -0700
commite2ac836307e346969737c60075fdb01bed1af503 (patch)
tree56fe6860df31c4d016db3a430dbad9387f8b4e04 /fs/xfs/xfs_bmap_util.c
parentce397d215ccd07b8ae3f71db689aedb85d56ab40 (diff)
downloadlinux-e2ac836307e346969737c60075fdb01bed1af503.tar.bz2
xfs: simplify xfs_bmap_punch_delalloc_range
Instead of using xfs_bmapi_read to find delalloc extents and then punch them out using xfs_bunmapi, opencode the loop to iterate over the extents and call xfs_bmap_del_extent_delay directly. This both simplifies the code and reduces the number of extent tree lookups required. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> 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_bmap_util.c')
-rw-r--r--fs/xfs/xfs_bmap_util.c85
1 files changed, 32 insertions, 53 deletions
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index c35009a86699..c195b9d857af 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -685,12 +685,10 @@ out_unlock_iolock:
}
/*
- * dead simple method of punching delalyed allocation blocks from a range in
- * the inode. Walks a block at a time so will be slow, but is only executed in
- * rare error cases so the overhead is not critical. This will always punch out
- * both the start and end blocks, even if the ranges only partially overlap
- * them, so it is up to the caller to ensure that partial blocks are not
- * passed in.
+ * Dead simple method of punching delalyed allocation blocks from a range in
+ * the inode. This will always punch out both the start and end blocks, even
+ * if the ranges only partially overlap them, so it is up to the caller to
+ * ensure that partial blocks are not passed in.
*/
int
xfs_bmap_punch_delalloc_range(
@@ -698,63 +696,44 @@ xfs_bmap_punch_delalloc_range(
xfs_fileoff_t start_fsb,
xfs_fileoff_t length)
{
- xfs_fileoff_t remaining = length;
+ struct xfs_ifork *ifp = &ip->i_df;
+ xfs_fileoff_t end_fsb = start_fsb + length;
+ struct xfs_bmbt_irec got, del;
+ struct xfs_iext_cursor icur;
int error = 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
- do {
- int done;
- xfs_bmbt_irec_t imap;
- int nimaps = 1;
- xfs_fsblock_t firstblock;
- struct xfs_defer_ops dfops;
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ return error;
+ }
- /*
- * Map the range first and check that it is a delalloc extent
- * before trying to unmap the range. Otherwise we will be
- * trying to remove a real extent (which requires a
- * transaction) or a hole, which is probably a bad idea...
- */
- error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
- XFS_BMAPI_ENTIRE);
+ if (!xfs_iext_lookup_extent_before(ip, ifp, &end_fsb, &icur, &got))
+ return 0;
- if (error) {
- /* something screwed, just bail */
- if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
- xfs_alert(ip->i_mount,
- "Failed delalloc mapping lookup ino %lld fsb %lld.",
- ip->i_ino, start_fsb);
- }
- break;
- }
- if (!nimaps) {
- /* nothing there */
- goto next_block;
- }
- if (imap.br_startblock != DELAYSTARTBLOCK) {
- /* been converted, ignore */
- goto next_block;
- }
- WARN_ON(imap.br_blockcount == 0);
+ while (got.br_startoff + got.br_blockcount > start_fsb) {
+ del = got;
+ xfs_trim_extent(&del, start_fsb, length);
/*
- * Note: while we initialise the firstblock/dfops pair, they
- * should never be used because blocks should never be
- * allocated or freed for a delalloc extent and hence we need
- * don't cancel or finish them after the xfs_bunmapi() call.
+ * A delete can push the cursor forward. Step back to the
+ * previous extent on non-delalloc or extents outside the
+ * target range.
*/
- xfs_defer_init(&dfops, &firstblock);
- error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
- &dfops, &done);
- if (error)
- break;
+ if (!del.br_blockcount ||
+ !isnullstartblock(del.br_startblock)) {
+ if (!xfs_iext_prev_extent(ifp, &icur, &got))
+ break;
+ continue;
+ }
- ASSERT(!xfs_defer_has_unfinished_work(&dfops));
-next_block:
- start_fsb++;
- remaining--;
- } while(remaining > 0);
+ error = xfs_bmap_del_extent_delay(ip, XFS_DATA_FORK, &icur,
+ &got, &del);
+ if (error || !xfs_iext_get_extent(ifp, &icur, &got))
+ break;
+ }
return error;
}