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xfs: undo block reservation correctly in xfs_trans_reserve()

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"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 0d485ada40 ("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
reproducer.

Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Eryu Guan 2016-09-14 07:39:07 +10:00 committed by Dave Chinner
parent ea78d80866
commit a27f6ef4e6
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_trans.c
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@ -217,7 +217,7 @@ xfs_trans_reserve(
undo_blocks:
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;
}