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Message-Id: <308d30d163995b77b264982dd463ae05aedeb0f9.1411724723.git.jslaby@suse.cz> Date: Fri, 26 Sep 2014 11:43:42 +0200 From: Jiri Slaby <jslaby@...e.cz> To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Filipe Manana <fdmanana@...e.com>, Chris Mason <clm@...com>, Jiri Slaby <jslaby@...e.cz> Subject: [PATCH 3.12 011/142] Btrfs: read lock extent buffer while walking backrefs From: Filipe Manana <fdmanana@...e.com> 3.12-stable review patch. If anyone has any objections, please let me know. =============== 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@...e.com> Signed-off-by: Chris Mason <clm@...com> Signed-off-by: Jiri Slaby <jslaby@...e.cz> --- fs/btrfs/backref.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 715cfa42e182..53039de1495d 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -954,8 +954,11 @@ 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; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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