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[v2] xfs: undo block reservation correctly in xfs_trans_reserve()

Message ID 1473164080-7405-1-git-send-email-eguan@redhat.com (mailing list archive)
State Accepted
Headers show

Commit Message

Eryu Guan Sept. 6, 2016, 12:14 p.m. UTC
"blocks" should be added back to fdblocks at undo time, not taken
away, i.e. the minus sign should not be used.

This is a regression introduced by commit 0d485ada404b ("xfs: use
generic percpu counters for free block counter"). And it's found by
code inspection, I didn't it in real world, so there's no

Signed-off-by: Eryu Guan <eguan@redhat.com>
- Remove "Fixes:" tag and describe relevant commit in commit log
- Update commit log to mention that it's found by code inspection
- Remove outer () from the "int64_t" cast

 fs/xfs/xfs_trans.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 5f3d33d..836eb80 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -217,7 +217,7 @@  undo_log:
 	if (blocks > 0) {
-		xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
+		xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
 		tp->t_blk_res = 0;