This is a note to let you know that I've just added the patch titled
Btrfs: read lock extent buffer while walking backrefs
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-read-lock-extent-buffer-while-walking-backrefs.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f7ff6d7832c6be13e8c95598884dbc40ad69fb7 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@xxxxxxxx>
Date: Wed, 2 Jul 2014 20:07:54 +0100
Subject: Btrfs: read lock extent buffer while walking backrefs
From: Filipe Manana <fdmanana@xxxxxxxx>
commit 6f7ff6d7832c6be13e8c95598884dbc40ad69fb7 upstream.
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@xxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/backref.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1000,8 +1000,11 @@ 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;
Patches currently in stable-queue which might be from fdmanana@xxxxxxxx are
queue-3.16/btrfs-fix-csum-tree-corruption-duplicate-and-outdated-checksums.patch
queue-3.16/btrfs-read-lock-extent-buffer-while-walking-backrefs.patch
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