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Btrfs: hold the commit_root_sem when getting the commit root during send

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We currently rely too heavily on roots being read-only to save us from just
accessing root->commit_root.  We can easily balance blocks out from underneath a
read only root, so to save us from getting screwed make sure we only access
root->commit_root under the commit root sem.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik
2014-03-28 17:16:01 -04:00
committed by Chris Mason
parent 9e351cc862
commit 3f8a18cc53
3 changed files with 39 additions and 16 deletions
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fs/btrfs/ctree.h
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@@ -609,6 +609,7 @@ struct btrfs_path {
unsigned int skip_locking:1;
unsigned int leave_spinning:1;
unsigned int search_commit_root:1;
unsigned int need_commit_sem:1;
};
/*