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Btrfs: read lock extent buffer while walking backrefs

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Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Filipe Manana 2014-07-02 20:07:54 +01:00 committed by Chris Mason
parent e339a6b097
commit 6f7ff6d783
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/backref.c
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@ -1001,8 +1001,11 @@ again:
ret = -EIO;
goto out;
}
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
ret = find_extent_in_eb(eb, bytenr,
*extent_item_pos, &eie);
btrfs_tree_read_unlock_blocking(eb);
free_extent_buffer(eb);
if (ret < 0)
goto out;