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author | 2014-07-02 20:07:54 +0100 | |
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committer | 2014-08-15 07:43:13 -0700 | |
commit | 6f7ff6d7832c6be13e8c95598884dbc40ad69fb7 (patch) | |
tree | 77cfeb9532c7eb15a9d6a1c880066e49e24a9e96 | |
parent | Btrfs: __btrfs_mod_ref should always use no_quota (diff) | |
download | linux-6f7ff6d7832c6be13e8c95598884dbc40ad69fb7.tar.gz linux-6f7ff6d7832c6be13e8c95598884dbc40ad69fb7.tar.bz2 linux-6f7ff6d7832c6be13e8c95598884dbc40ad69fb7.zip |
Btrfs: read lock extent buffer while walking backrefs
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>
-rw-r--r-- | fs/btrfs/backref.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index e25564bfcb46..a1efd39ca28a 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -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; |