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btrfs: hold a ref on the root in btrfs_recover_log_trees

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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>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik
2020-01-24 09:32:51 -05:00
committed by David Sterba
parent 5119cfc36f
commit ca2037fba6
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/tree-log.c
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@@ -6163,6 +6163,10 @@ 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);
@@ -6219,6 +6223,7 @@ 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);