[09/43] btrfs: handle NULL roots in btrfs_put/btrfs_grab_fs_root
diff mbox series

Message ID 20200117134758.41494-10-josef@toxicpanda.com
State New
Headers show
  • Cleanup how we handle root refs, part 2
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Commit Message

Josef Bacik Jan. 17, 2020, 1:47 p.m. UTC
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).

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
 fs/btrfs/disk-io.h | 4 ++++
 1 file changed, 4 insertions(+)

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diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 7aa1c7a3a115..8add2e14aab1 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -88,6 +88,8 @@  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;
@@ -95,6 +97,8 @@  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))