* [PATCH] Btrfs: read lock extent buffer while walking backrefs
@ 2014-07-02 19:07 Filipe Manana
0 siblings, 0 replies; only message in thread
From: Filipe Manana @ 2014-07-02 19:07 UTC (permalink / raw)
To: linux-btrfs; +Cc: Filipe Manana
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>
---
fs/btrfs/backref.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index e25564b..a1efd39 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;
--
1.9.1
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2014-07-02 19:07 [PATCH] Btrfs: read lock extent buffer while walking backrefs Filipe Manana
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