[PATCH 36/44] btrfs: hold a ref on the root in btrfs_recover_log_trees

Josef Bacik
2019-12-06T14:46:47Z

We replay the log into arbitrary fs roots, hold a ref on the root while
we're doing this.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/tree-log.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index a4321bdcbf3e..07e7fd508213 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -6292,6 +6292,10 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
tmp_key.offset = (u64)-1;

wc.replay_dest = btrfs_get_fs_root(fs_info, &tmp_key, true);
+ if (!IS_ERR(wc.replay_dest)) {
+ if (!btrfs_grab_fs_root(wc.replay_dest))
+ wc.replay_dest = ERR_PTR(-ENOENT);
+ }
if (IS_ERR(wc.replay_dest)) {
ret = PTR_ERR(wc.replay_dest);

@@ -6348,6 +6352,7 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
}

wc.replay_dest->log_root = NULL;
+ btrfs_put_fs_root(wc.replay_dest);
free_extent_buffer(log->node);
free_extent_buffer(log->commit_root);
kfree(log);
--
2.23.0