5.15-stable review patch. If anyone has any objections, please let me know.
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From: Filipe Manana fdmanana@suse.com
[ 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@wdc.com Reviewed-by: David Sterba dsterba@suse.com Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/inode.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index eb12ba64ac7a7..8f048e517e656 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -10891,6 +10891,7 @@ 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",