From: Josef Bacik josef@toxicpanda.com
[ Upstream commit 4cdfd93002cb84471ed85b4999cd38077a317873 ]
We want to use this for dropping all roots, and in some error cases we may not have a root, so handle this to make the cleanup code easier. Make btrfs_grab_fs_root the same so we can use it in cases where the root may not exist (like the quota root).
Reviewed-by: Nikolay Borisov nborisov@suse.com Signed-off-by: Josef Bacik josef@toxicpanda.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/disk-io.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index 8c2d6cf1ce596..424c9c97b1ce8 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -97,6 +97,8 @@ struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); */ static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) { + if (!root) + return NULL; if (refcount_inc_not_zero(&root->refs)) return root; return NULL; @@ -104,6 +106,8 @@ static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
static inline void btrfs_put_fs_root(struct btrfs_root *root) { + if (!root) + return; if (refcount_dec_and_test(&root->refs)) kfree(root); }