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Subject[PATCH v2 1/6] Btrfs: lock superblock before remounting for rw subvol
Since commit 0723a0473fb4 ("btrfs: allow mounting btrfs subvolumes with
different ro/rw options"), when mounting a subvolume read/write when
another subvolume has previously been mounted read-only, we first do a
remount. However, this should be done with the superblock locked, as per

* We need to be protected against the filesystem going from
* r/o to r/w or vice versa.

This WARN_ON can easily be hit with:

mkfs.btrfs -f /dev/vdb
mount /dev/vdb /mnt
btrfs subvol create /mnt/vol1
btrfs subvol create /mnt/vol2
umount /mnt
mount -oro,subvol=/vol1 /dev/vdb /mnt
mount -orw,subvol=/vol2 /dev/vdb /mnt2

Fixes: 0723a0473fb4 ("btrfs: allow mounting btrfs subvolumes with different ro/rw options")
Signed-off-by: Omar Sandoval <>
fs/btrfs/super.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 05fef19..d38be09 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1205,7 +1205,9 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
return ERR_CAST(mnt);

+ down_write(&mnt->mnt_sb->s_umount);
r = btrfs_remount(mnt->mnt_sb, &flags, NULL);
+ up_write(&mnt->mnt_sb->s_umount);
if (r < 0) {
/* FIXME: release vfsmount mnt ??*/

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