Patch "btrfs: free qgroup rsv on io failure" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    btrfs: free qgroup rsv on io failure

to the 5.10-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-free-qgroup-rsv-on-io-failure.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e28b02118b94e42be3355458a2406c6861e2dd32 Mon Sep 17 00:00:00 2001
From: Boris Burkov <boris@xxxxxx>
Date: Fri, 21 Jul 2023 09:02:06 -0700
Subject: btrfs: free qgroup rsv on io failure

From: Boris Burkov <boris@xxxxxx>

commit e28b02118b94e42be3355458a2406c6861e2dd32 upstream.

If we do a write whose bio suffers an error, we will never reclaim the
qgroup reserved space for it. We allocate the space in the write_iter
codepath, then release the reservation as we allocate the ordered
extent, but we only create a delayed ref if the ordered extent finishes.
If it has an error, we simply leak the rsv. This is apparent in running
any error injecting (dmerror) fstests like btrfs/146 or btrfs/160. Such
tests fail due to dmesg on umount complaining about the leaked qgroup
data space.

When we clean up other aspects of space on failed ordered_extents, also
free the qgroup rsv.

Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 5.10+
Signed-off-by: Boris Burkov <boris@xxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/btrfs/inode.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2804,6 +2804,13 @@ out:
 			btrfs_free_reserved_extent(fs_info,
 					ordered_extent->disk_bytenr,
 					ordered_extent->disk_num_bytes, 1);
+			/*
+			 * Actually free the qgroup rsv which was released when
+			 * the ordered extent was created.
+			 */
+			btrfs_qgroup_free_refroot(fs_info, inode->root->root_key.objectid,
+						  ordered_extent->qgroup_rsv,
+						  BTRFS_QGROUP_RSV_DATA);
 		}
 	}
 


Patches currently in stable-queue which might be from boris@xxxxxx are

queue-5.10/btrfs-fix-start-transaction-qgroup-rsv-double-free.patch
queue-5.10/btrfs-free-qgroup-rsv-on-io-failure.patch



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