Merge tag 'for-5.16-rc5-tag' of git://git.kernel.org/pub/scm/linux/ke…

…rnel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "A few more fixes, almost all error handling one-liners and for stable.

   - regression fix in directory logging items

   - regression fix of extent buffer status bits handling after an error

   - fix memory leak in error handling path in tree-log

   - fix freeing invalid anon device number when handling errors during
     subvolume creation

   - fix warning when freeing leaf after subvolume creation failure

   - fix missing blkdev put in device scan error handling

   - fix invalid delayed ref after subvolume creation failure"

* tag 'for-5.16-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: fix missing blkdev_put() call in btrfs_scan_one_device()
  btrfs: fix warning when freeing leaf after subvolume creation failure
  btrfs: fix invalid delayed ref after subvolume creation failure
  btrfs: check WRITE_ERR when trying to read an extent buffer
  btrfs: fix missing last dir item offset update when logging directory
  btrfs: fix double free of anon_dev after failure to create subvolume
  btrfs: fix memory leak in __add_inode_ref()

fs/btrfs/ctree.c

@@ -463,8 +463,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
 		BUG_ON(ret < 0);
 		rcu_assign_pointer(root->node, cow);
 
-		btrfs_free_tree_block(trans, root, buf, parent_start,
-				      last_ref);
+		btrfs_free_tree_block(trans, btrfs_root_id(root), buf,
+				      parent_start, last_ref);
 		free_extent_buffer(buf);
 		add_root_to_dirty_list(root);
 	} else {
@@ -485,8 +485,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
 				return ret;
 			}
 		}
-		btrfs_free_tree_block(trans, root, buf, parent_start,
-				      last_ref);
+		btrfs_free_tree_block(trans, btrfs_root_id(root), buf,
+				      parent_start, last_ref);
 	}
 	if (unlock_orig)
 		btrfs_tree_unlock(buf);
@@ -927,7 +927,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 		free_extent_buffer(mid);
 
 		root_sub_used(root, mid->len);
-		btrfs_free_tree_block(trans, root, mid, 0, 1);
+		btrfs_free_tree_block(trans, btrfs_root_id(root), mid, 0, 1);
 		/* once for the root ptr */
 		free_extent_buffer_stale(mid);
 		return 0;
@@ -986,7 +986,8 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 			btrfs_tree_unlock(right);
 			del_ptr(root, path, level + 1, pslot + 1);
 			root_sub_used(root, right->len);
-			btrfs_free_tree_block(trans, root, right, 0, 1);
+			btrfs_free_tree_block(trans, btrfs_root_id(root), right,
+					      0, 1);
 			free_extent_buffer_stale(right);
 			right = NULL;
 		} else {
@@ -1031,7 +1032,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 		btrfs_tree_unlock(mid);
 		del_ptr(root, path, level + 1, pslot);
 		root_sub_used(root, mid->len);
-		btrfs_free_tree_block(trans, root, mid, 0, 1);
+		btrfs_free_tree_block(trans, btrfs_root_id(root), mid, 0, 1);
 		free_extent_buffer_stale(mid);
 		mid = NULL;
 	} else {
@@ -4032,7 +4033,7 @@ static noinline void btrfs_del_leaf(struct btrfs_trans_handle *trans,
 	root_sub_used(root, leaf->len);
 
 	atomic_inc(&leaf->refs);
-	btrfs_free_tree_block(trans, root, leaf, 0, 1);
+	btrfs_free_tree_block(trans, btrfs_root_id(root), leaf, 0, 1);
 	free_extent_buffer_stale(leaf);
 }
 /*

fs/btrfs/ctree.h

@@ -2257,6 +2257,11 @@ static inline bool btrfs_root_dead(const struct btrfs_root *root)
 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
 }
 
+static inline u64 btrfs_root_id(const struct btrfs_root *root)
+{
+	return root->root_key.objectid;
+}
+
 /* struct btrfs_root_backup */
 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
 		   tree_root, 64);
@@ -2719,7 +2724,7 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
 					     u64 empty_size,
 					     enum btrfs_lock_nesting nest);
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *root,
+			   u64 root_id,
 			   struct extent_buffer *buf,
 			   u64 parent, int last_ref);
 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,

fs/btrfs/disk-io.c

@@ -1732,6 +1732,14 @@ static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
 	}
 	return root;
 fail:
+	/*
+	 * If our caller provided us an anonymous device, then it's his
+	 * responsability to free it in case we fail. So we have to set our
+	 * root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
+	 * and once again by our caller.
+	 */
+	if (anon_dev)
+		root->anon_dev = 0;
 	btrfs_put_root(root);
 	return ERR_PTR(ret);
 }

fs/btrfs/extent-tree.c

@@ -3275,20 +3275,20 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
 }
 
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
-			   struct btrfs_root *root,
+			   u64 root_id,
 			   struct extent_buffer *buf,
 			   u64 parent, int last_ref)
 {
-	struct btrfs_fs_info *fs_info = root->fs_info;
+	struct btrfs_fs_info *fs_info = trans->fs_info;
 	struct btrfs_ref generic_ref = { 0 };
 	int ret;
 
 	btrfs_init_generic_ref(&generic_ref, BTRFS_DROP_DELAYED_REF,
 			       buf->start, buf->len, parent);
 	btrfs_init_tree_ref(&generic_ref, btrfs_header_level(buf),
-			    root->root_key.objectid, 0, false);
+			    root_id, 0, false);
 
-	if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
+	if (root_id != BTRFS_TREE_LOG_OBJECTID) {
 		btrfs_ref_tree_mod(fs_info, &generic_ref);
 		ret = btrfs_add_delayed_tree_ref(trans, &generic_ref, NULL);
 		BUG_ON(ret); /* -ENOMEM */
@@ -3298,7 +3298,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 		struct btrfs_block_group *cache;
 		bool must_pin = false;
 
-		if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
+		if (root_id != BTRFS_TREE_LOG_OBJECTID) {
 			ret = check_ref_cleanup(trans, buf->start);
 			if (!ret) {
 				btrfs_redirty_list_add(trans->transaction, buf);
@@ -5472,7 +5472,8 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
 			goto owner_mismatch;
 	}
 
-	btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1);
+	btrfs_free_tree_block(trans, btrfs_root_id(root), eb, parent,
+			      wc->refs[level] == 1);
 out:
 	wc->refs[level] = 0;
 	wc->flags[level] = 0;

fs/btrfs/extent_io.c

@@ -6611,6 +6611,14 @@ int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num)
 	if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
 		return 0;
 
+	/*
+	 * We could have had EXTENT_BUFFER_UPTODATE cleared by the write
+	 * operation, which could potentially still be in flight.  In this case
+	 * we simply want to return an error.
+	 */
+	if (unlikely(test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)))
+		return -EIO;
+
 	if (eb->fs_info->sectorsize < PAGE_SIZE)
 		return read_extent_buffer_subpage(eb, wait, mirror_num);
 

fs/btrfs/free-space-tree.c

@@ -1256,8 +1256,8 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
 	btrfs_tree_lock(free_space_root->node);
 	btrfs_clean_tree_block(free_space_root->node);
 	btrfs_tree_unlock(free_space_root->node);
-	btrfs_free_tree_block(trans, free_space_root, free_space_root->node,
-			      0, 1);
+	btrfs_free_tree_block(trans, btrfs_root_id(free_space_root),
+			      free_space_root->node, 0, 1);
 
 	btrfs_put_root(free_space_root);
 

fs/btrfs/ioctl.c

@@ -617,11 +617,13 @@ static noinline int create_subvol(struct user_namespace *mnt_userns,
 		 * Since we don't abort the transaction in this case, free the
 		 * tree block so that we don't leak space and leave the
 		 * filesystem in an inconsistent state (an extent item in the
-		 * extent tree without backreferences). Also no need to have
-		 * the tree block locked since it is not in any tree at this
-		 * point, so no other task can find it and use it.
+		 * extent tree with a backreference for a root that does not
+		 * exists).
 		 */
-		btrfs_free_tree_block(trans, root, leaf, 0, 1);
+		btrfs_tree_lock(leaf);
+		btrfs_clean_tree_block(leaf);
+		btrfs_tree_unlock(leaf);
+		btrfs_free_tree_block(trans, objectid, leaf, 0, 1);
 		free_extent_buffer(leaf);
 		goto fail;
 	}

fs/btrfs/qgroup.c

@@ -1219,7 +1219,8 @@ int btrfs_quota_disable(struct btrfs_fs_info *fs_info)
 	btrfs_tree_lock(quota_root->node);
 	btrfs_clean_tree_block(quota_root->node);
 	btrfs_tree_unlock(quota_root->node);
-	btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
+	btrfs_free_tree_block(trans, btrfs_root_id(quota_root),
+			      quota_root->node, 0, 1);
 
 	btrfs_put_root(quota_root);
 

fs/btrfs/tree-log.c

@@ -1181,6 +1181,7 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
 					     parent_objectid, victim_name,
 					     victim_name_len);
 			if (ret < 0) {
+				kfree(victim_name);
 				return ret;
 			} else if (!ret) {
 				ret = -ENOENT;
@@ -3977,6 +3978,7 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans,
 			goto done;
 		}
 		if (btrfs_header_generation(path->nodes[0]) != trans->transid) {
+			ctx->last_dir_item_offset = min_key.offset;
 			ret = overwrite_item(trans, log, dst_path,
 					     path->nodes[0], path->slots[0],
 					     &min_key);

fs/btrfs/volumes.c

@@ -1370,8 +1370,10 @@ struct btrfs_device *btrfs_scan_one_device(const char *path, fmode_t flags,
 
 	bytenr_orig = btrfs_sb_offset(0);
 	ret = btrfs_sb_log_location_bdev(bdev, 0, READ, &bytenr);
-	if (ret)
-		return ERR_PTR(ret);
+	if (ret) {
+		device = ERR_PTR(ret);
+		goto error_bdev_put;
+	}
 
 	disk_super = btrfs_read_disk_super(bdev, bytenr, bytenr_orig);
 	if (IS_ERR(disk_super)) {