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btrfs: update barrier in should_cow_block

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Once there was a simple int force_cow that was used with the plain
barriers, and then converted to a bit, so we should use the appropriate
barrier helper.

Other variables in the complex if condition do not depend on a barrier,
so we should be fine in case the atomic barrier becomes a no-op.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-03-16 02:39:40 +01:00
parent a32bf9a302
commit d1980131ca
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/ctree.c
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@ -1441,8 +1441,8 @@ static inline int should_cow_block(struct btrfs_trans_handle *trans,
if (btrfs_is_testing(root->fs_info)) if (btrfs_is_testing(root->fs_info))
return 0; return 0;
/* ensure we can see the force_cow */ /* Ensure we can see the FORCE_COW bit */
smp_rmb(); smp_mb__before_atomic();
/* /*
* We do not need to cow a block if * We do not need to cow a block if