| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.5 043/106] btrfs: handle NULL roots in btrfs_put/btrfs_grab_fs_root | Date | Wed, 15 Apr 2020 07:41:23 -0400 |
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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 76f123ebb2921..3c63b0965ad64 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); } -- 2.20.1
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