5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Filipe Manana <fdmanana@xxxxxxxx>
[ Upstream commit 9c803c474c6c002d8ade68ebe99026cc39c37f85 ]
When activating a swap file we acquire the root's snapshot drew lock and
then check if the root is dead, failing and returning with -EPERM if it's
dead but without unlocking the root's snapshot lock. Fix this by adding
the missing unlock.
Fixes: 60021bd754c6 ("btrfs: prevent subvol with swapfile from being deleted")
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/btrfs/inode.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 24598acb9a314..eba87f2936d2c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10283,6 +10283,7 @@ static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
if (btrfs_root_dead(root)) {
spin_unlock(&root->root_item_lock);
+ btrfs_drew_write_unlock(&root->snapshot_lock);
btrfs_exclop_finish(fs_info);
btrfs_warn(fs_info,
"cannot activate swapfile because subvolume %llu is being deleted",
--
2.43.0
