diff options
| -rw-r--r-- | fs/btrfs/qgroup.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 158633c9bbd9..31d19344427a 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -2192,10 +2192,10 @@ void assert_qgroups_uptodate(struct btrfs_trans_handle *trans) */ static int qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path, - struct btrfs_trans_handle *trans, - struct extent_buffer *scratch_leaf) + struct btrfs_trans_handle *trans) { struct btrfs_key found; + struct extent_buffer *scratch_leaf = NULL; struct ulist *roots = NULL; struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem); u64 num_bytes; @@ -2233,7 +2233,15 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path, fs_info->qgroup_rescan_progress.objectid = found.objectid + 1; btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem); - memcpy(scratch_leaf, path->nodes[0], sizeof(*scratch_leaf)); + scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]); + if (!scratch_leaf) { + ret = -ENOMEM; + mutex_unlock(&fs_info->qgroup_rescan_lock); + goto out; + } + extent_buffer_get(scratch_leaf); + btrfs_tree_read_lock(scratch_leaf); + btrfs_set_lock_blocking_rw(scratch_leaf, BTRFS_READ_LOCK); slot = path->slots[0]; btrfs_release_path(path); mutex_unlock(&fs_info->qgroup_rescan_lock); @@ -2259,6 +2267,10 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path, goto out; } out: + if (scratch_leaf) { + btrfs_tree_read_unlock_blocking(scratch_leaf); + free_extent_buffer(scratch_leaf); + } btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem); return ret; @@ -2270,16 +2282,12 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work) qgroup_rescan_work); struct btrfs_path *path; struct btrfs_trans_handle *trans = NULL; - struct extent_buffer *scratch_leaf = NULL; int err = -ENOMEM; int ret = 0; path = btrfs_alloc_path(); if (!path) goto out; - scratch_leaf = kmalloc(sizeof(*scratch_leaf), GFP_NOFS); - if (!scratch_leaf) - goto out; err = 0; while (!err) { @@ -2291,8 +2299,7 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work) if (!fs_info->quota_enabled) { err = -EINTR; } else { - err = qgroup_rescan_leaf(fs_info, path, trans, - scratch_leaf); + err = qgroup_rescan_leaf(fs_info, path, trans); } if (err > 0) btrfs_commit_transaction(trans, fs_info->fs_root); @@ -2301,7 +2308,6 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work) } out: - kfree(scratch_leaf); btrfs_free_path(path); mutex_lock(&fs_info->qgroup_rescan_lock); |