[PATCH 29/43] btrfs: hold a ref for the root in btrfs_find_orphan_roots

Josef Bacik
2020-01-17T21:27:17Z

We lookup roots for every orphan item we have, we need to hold a ref on
the root while we're doing this work.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/root-tree.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 094a71c54fa1..25842527fd42 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -257,6 +257,8 @@ int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info)

root = btrfs_get_fs_root(fs_info, &root_key, false);
err = PTR_ERR_OR_ZERO(root);
+ if (!err && !btrfs_grab_fs_root(root))
+ err = -ENOENT;
if (err && err != -ENOENT) {
break;
} else if (err == -ENOENT) {
@@ -288,6 +290,7 @@ int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info)
set_bit(BTRFS_ROOT_DEAD_TREE, &root->state);
btrfs_add_dead_root(root);
}
+ btrfs_put_fs_root(root);
}

btrfs_free_path(path);
--
2.24.1