This is a note to let you know that I've just added the patch titled
Btrfs: fix deadlock in run_delalloc_nocow
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-deadlock-in-run_delalloc_nocow.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 e89166990f11c3f21e1649d760dd35f9e410321c Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
Date: Thu, 25 Jan 2018 11:02:50 -0700
Subject: Btrfs: fix deadlock in run_delalloc_nocow
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
commit e89166990f11c3f21e1649d760dd35f9e410321c upstream.
@cur_offset is not set back to what it should be (@cow_start) if
btrfs_next_leaf() returns something wrong, and the range [cow_start,
cur_offset) remains locked forever.
cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Reviewed-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1320,8 +1320,11 @@ next_slot:
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root, path);
- if (ret < 0)
+ if (ret < 0) {
+ if (cow_start != (u64)-1)
+ cur_offset = cow_start;
goto error;
+ }
if (ret > 0)
break;
leaf = path->nodes[0];
Patches currently in stable-queue which might be from bo.li.liu@xxxxxxxxxx are
queue-4.9/btrfs-fix-btrfs_evict_inode-to-handle-abnormal-inodes-correctly.patch
queue-4.9/btrfs-fix-crash-due-to-not-cleaning-up-tree-log-block-s-dirty-bits.patch
queue-4.9/btrfs-fix-extent-state-leak-from-tree-log.patch
queue-4.9/btrfs-fix-unexpected-eexist-when-creating-new-inode.patch
queue-4.9/btrfs-fix-deadlock-in-run_delalloc_nocow.patch