FAILED: patch "[PATCH] btrfs: qgroup: fix sleep from invalid context bug in" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] btrfs: qgroup: fix sleep from invalid context bug in" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

f7e942b5bb35 ("btrfs: qgroup: fix sleep from invalid context bug in btrfs_qgroup_inherit()")
e562a8bdf652 ("btrfs: introduce BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN")
db5df2541200 ("btrfs: move QUOTA_ENABLED check to rescan_should_stop from btrfs_qgroup_rescan_worker")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f7e942b5bb35d8e3af54053d19a6bf04143a3955 Mon Sep 17 00:00:00 2001
From: ChenXiaoSong <chenxiaosong2@huawei.com>
Date: Wed, 16 Nov 2022 22:23:54 +0800
Subject: [PATCH] btrfs: qgroup: fix sleep from invalid context bug in
 btrfs_qgroup_inherit()

Syzkaller reported BUG as follows:

  BUG: sleeping function called from invalid context at
       include/linux/sched/mm.h:274
  Call Trace:
   <TASK>
   dump_stack_lvl+0xcd/0x134
   __might_resched.cold+0x222/0x26b
   kmem_cache_alloc+0x2e7/0x3c0
   update_qgroup_limit_item+0xe1/0x390
   btrfs_qgroup_inherit+0x147b/0x1ee0
   create_subvol+0x4eb/0x1710
   btrfs_mksubvol+0xfe5/0x13f0
   __btrfs_ioctl_snap_create+0x2b0/0x430
   btrfs_ioctl_snap_create_v2+0x25a/0x520
   btrfs_ioctl+0x2a1c/0x5ce0
   __x64_sys_ioctl+0x193/0x200
   do_syscall_64+0x35/0x80

Fix this by calling qgroup_dirty() on @dstqgroup, and update limit item in
btrfs_run_qgroups() later outside of the spinlock context.

CC: stable@vger.kernel.org # 4.9+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 9334c3157c22..b74105a10f16 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2951,14 +2951,7 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
 		dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
 		dstgroup->rsv_excl = inherit->lim.rsv_excl;
 
-		ret = update_qgroup_limit_item(trans, dstgroup);
-		if (ret) {
-			qgroup_mark_inconsistent(fs_info);
-			btrfs_info(fs_info,
-				   "unable to update quota limit for %llu",
-				   dstgroup->qgroupid);
-			goto unlock;
-		}
+		qgroup_dirty(fs_info, dstgroup);
 	}
 
 	if (srcid) {