This is a note to let you know that I've just added the patch titled
Btrfs: fix BUG_ON in btrfs_mark_buffer_dirty
to the 4.9-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-bug_on-in-btrfs_mark_buffer_dirty.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ef85b25e982b5bba1530b936e283ef129f02ab9d Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
Date: Fri, 2 Sep 2016 12:35:34 -0700
Subject: Btrfs: fix BUG_ON in btrfs_mark_buffer_dirty
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
commit ef85b25e982b5bba1530b936e283ef129f02ab9d upstream.
This can only happen with CONFIG_BTRFS_FS_CHECK_INTEGRITY=y.
Commit 1ba98d0 ("Btrfs: detect corruption when non-root leaf has zero item")
assumes that a leaf is its root when leaf->bytenr == btrfs_root_bytenr(root),
however, we should not use btrfs_root_bytenr(root) since it's mainly got
updated during committing transaction. So the check can fail when doing
COW on this leaf while it is a root.
This changes to use "if (leaf == btrfs_root_node(root))" instead, just like
how we check whether leaf is a root in __btrfs_cow_block().
Fixes: 1ba98d086fe3 (Btrfs: detect corruption when non-root leaf has zero item)
Reported-by: Jeff Mahoney <jeffm@xxxxxxxx>
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/disk-io.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -572,13 +572,17 @@ static noinline int check_leaf(struct bt
* open_ctree() some roots has not yet been set up.
*/
if (!IS_ERR_OR_NULL(check_root)) {
+ struct extent_buffer *eb;
+
+ eb = btrfs_root_node(check_root);
/* if leaf is the root, then it's fine */
- if (leaf->start !=
- btrfs_root_bytenr(&check_root->root_item)) {
+ if (leaf != eb) {
CORRUPT("non-root leaf's nritems is 0",
- leaf, root, 0);
+ leaf, check_root, 0);
+ free_extent_buffer(eb);
return -EIO;
}
+ free_extent_buffer(eb);
}
return 0;
}
Patches currently in stable-queue which might be from bo.li.liu@xxxxxxxxxx are
queue-4.9/btrfs-fix-emptiness-check-for-dirtied-extent-buffers-at-check_leaf.patch
queue-4.9/btrfs-fix-bug_on-in-btrfs_mark_buffer_dirty.patch
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