This is a note to let you know that I've just added the patch titled
Btrfs: fix inode eviction infinite loop after extent_same ioctl
to the 3.14-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-fix-inode-eviction-infinite-loop-after-extent_same-ioctl.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 113e8283869b9855c8b999796aadd506bbac155f Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@xxxxxxxx>
Date: Mon, 30 Mar 2015 18:26:47 +0100
Subject: Btrfs: fix inode eviction infinite loop after extent_same ioctl
From: Filipe Manana <fdmanana@xxxxxxxx>
commit 113e8283869b9855c8b999796aadd506bbac155f upstream.
If we pass a length of 0 to the extent_same ioctl, we end up locking an
extent range with a start offset greater then its end offset (if the
destination file's offset is greater than zero). This results in a warning
from extent_io.c:insert_state through the following call chain:
btrfs_extent_same()
btrfs_double_lock()
lock_extent_range()
lock_extent(inode->io_tree, offset, offset + len - 1)
lock_extent_bits()
__set_extent_bit()
insert_state()
--> WARN_ON(end < start)
This leads to an infinite loop when evicting the inode. This is the same
problem that my previous patch titled
"Btrfs: fix inode eviction infinite loop after cloning into it" addressed
but for the extent_same ioctl instead of the clone ioctl.
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Reviewed-by: Omar Sandoval <osandov@xxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2708,6 +2708,9 @@ static int btrfs_extent_same(struct inod
if (src == dst)
return -EINVAL;
+ if (len == 0)
+ return 0;
+
btrfs_double_lock(src, loff, dst, dst_loff, len);
ret = extent_same_check_offsets(src, loff, len);
Patches currently in stable-queue which might be from fdmanana@xxxxxxxx are
queue-3.14/btrfs-fix-log-tree-corruption-when-fs-mounted-with-o-discard.patch
queue-3.14/btrfs-fix-inode-eviction-infinite-loop-after-extent_same-ioctl.patch
queue-3.14/btrfs-fix-inode-eviction-infinite-loop-after-cloning-into-it.patch
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