The patch below does not apply to the 5.10-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.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 6bfe3959b0e7a526f5c64747801a8613f002f05a # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023091611-earring-chowder-4da2@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

6bfe3959b0e7 ("btrfs: compare the correct fsid/metadata_uuid in btrfs_validate_super") aefd7f706556 ("btrfs: promote debugging asserts to full-fledged checks in validate_super")

thanks,

greg k-h

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

From 6bfe3959b0e7a526f5c64747801a8613f002f05a Mon Sep 17 00:00:00 2001 From: Anand Jain anand.jain@oracle.com Date: Mon, 31 Jul 2023 19:16:35 +0800 Subject: [PATCH] btrfs: compare the correct fsid/metadata_uuid in btrfs_validate_super

The function btrfs_validate_super() should verify the metadata_uuid in the provided superblock argument. Because, all its callers expect it to do that.

Such as in the following stacks:

write_all_supers() sb = fs_info->super_for_commit; btrfs_validate_write_super(.., sb) btrfs_validate_super(.., sb, ..)

scrub_one_super() btrfs_validate_super(.., sb, ..)

And check_dev_super() btrfs_validate_super(.., sb, ..)

However, it currently verifies the fs_info::super_copy::metadata_uuid instead. Fix this using the correct metadata_uuid in the superblock argument.

CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Johannes Thumshirn johannes.thumshirn@wdc.com Tested-by: Guilherme G. Piccoli gpiccoli@igalia.com Signed-off-by: Anand Jain anand.jain@oracle.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 49f405495e34..32ec651c570f 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2391,13 +2391,11 @@ int btrfs_validate_super(struct btrfs_fs_info *fs_info, ret = -EINVAL; }

- if (btrfs_fs_incompat(fs_info, METADATA_UUID) && - memcmp(fs_info->fs_devices->metadata_uuid, - fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) { + if (memcmp(fs_info->fs_devices->metadata_uuid, btrfs_sb_fsid_ptr(sb), + BTRFS_FSID_SIZE) != 0) { btrfs_err(fs_info, "superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU", - fs_info->super_copy->metadata_uuid, - fs_info->fs_devices->metadata_uuid); + btrfs_sb_fsid_ptr(sb), fs_info->fs_devices->metadata_uuid); ret = -EINVAL; }