This is a note to let you know that I've just added the patch titled
btrfs: update latest_dev when we create a sprout device
to the 5.15-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-update-latest_dev-when-we-create-a-sprout-device.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Dec 17 03:55:51 PM CET 2021
From: Anand Jain <anand.jain@xxxxxxxxxx>
Date: Thu, 16 Dec 2021 21:04:12 +0800
Subject: btrfs: update latest_dev when we create a sprout device
To: linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx
Cc: linux-btrfs@xxxxxxxxxxxxxxx, Anand Jain <anand.jain@xxxxxxxxxx>, Su Yue <l@xxxxxxxxxx>, David Sterba <dsterba@xxxxxxxx>
Message-ID: <3cc9f5d26cf29f91b3a87df814ff84420e31080a.1639658429.git.anand.jain@xxxxxxxxxx>
From: Anand Jain <anand.jain@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from anand.jain@xxxxxxxxxx are
queue-5.15/btrfs-use-latest_dev-in-btrfs_show_devname.patch
queue-5.15/btrfs-convert-latest_bdev-type-to-btrfs_device-and-rename.patch
queue-5.15/btrfs-remove-stale-comment-about-the-btrfs_show_devname.patch
queue-5.15/btrfs-update-latest_dev-when-we-create-a-sprout-device.patch
