| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 032/177] btrfs: update latest_dev when we create a sprout device | Date | Mon, 20 Dec 2021 15:33:02 +0100 |
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From: Anand Jain <anand.jain@oracle.com>
Commit b7cb29e666fe79dda5dbe5f57fb7c92413bf161c upstream.
When we add a device to the seed filesystem (sprouting) it is a new filesystem (and fsid) on the device added. Update the latest_dev so that /proc/self/mounts shows the correct device.
Example:
$ btrfstune -S1 /dev/vg/seed $ mount /dev/vg/seed /btrfs mount: /btrfs: WARNING: device write-protected, mounted read-only.
$ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-seed /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0
$ btrfs dev add -f /dev/vg/new /btrfs
Before:
$ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-seed /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0
After:
$ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-new /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0
Tested-by: Su Yue <l@damenly.su> Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/btrfs/volumes.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2634,6 +2634,8 @@ int btrfs_init_new_device(struct btrfs_f btrfs_abort_transaction(trans, ret); goto error_trans; } + btrfs_assign_next_active_device(fs_info->fs_devices->latest_dev, + device); } device->fs_devices = fs_devices;
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