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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/btrfs/props.c
..
..
@@ -23,36 +23,6 @@
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 	int inheritable;
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 };
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25
 
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-static int prop_compression_validate(const char *value, size_t len);
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-static int prop_compression_apply(struct inode *inode,
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-				  const char *value,
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-				  size_t len);
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-static const char *prop_compression_extract(struct inode *inode);
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-
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-static struct prop_handler prop_handlers[] = {
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-	{
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-		.xattr_name = XATTR_BTRFS_PREFIX "compression",
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-		.validate = prop_compression_validate,
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-		.apply = prop_compression_apply,
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-		.extract = prop_compression_extract,
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-		.inheritable = 1
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-	},
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-};
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-
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-void __init btrfs_props_init(void)
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-{
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-	int i;
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-
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-	hash_init(prop_handlers_ht);
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-
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-	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
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-		struct prop_handler *p = &prop_handlers[i];
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-		u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
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-
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-		hash_add(prop_handlers_ht, &p->node, h);
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-	}
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-}
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-
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 static const struct hlist_head *find_prop_handlers_by_hash(const u64 hash)
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 {
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 	struct hlist_head *h;
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@@ -85,15 +55,9 @@
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 	return NULL;
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 }
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57
 
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-static int __btrfs_set_prop(struct btrfs_trans_handle *trans,
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-			    struct inode *inode,
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-			    const char *name,
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-			    const char *value,
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-			    size_t value_len,
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-			    int flags)
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+int btrfs_validate_prop(const char *name, const char *value, size_t value_len)
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 {
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 	const struct prop_handler *handler;
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-	int ret;
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 	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
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 		return -EINVAL;
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@@ -102,9 +66,26 @@
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 	if (!handler)
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 		return -EINVAL;
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68
 
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+	if (value_len == 0)
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+		return 0;
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+
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+	return handler->validate(value, value_len);
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+}
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+
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+int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
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+		   const char *name, const char *value, size_t value_len,
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+		   int flags)
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+{
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+	const struct prop_handler *handler;
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+	int ret;
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+
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+	handler = find_prop_handler(name, NULL);
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+	if (!handler)
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+		return -EINVAL;
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+
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 	if (value_len == 0) {
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 		ret = btrfs_setxattr(trans, inode, handler->xattr_name,
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-				       NULL, 0, flags);
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+				     NULL, 0, flags);
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 		if (ret)
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 			return ret;
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91
 
..
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@@ -114,32 +95,20 @@
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 		return ret;
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 	}
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97
 
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-	ret = handler->validate(value, value_len);
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-	if (ret)
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-		return ret;
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-	ret = btrfs_setxattr(trans, inode, handler->xattr_name,
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-			       value, value_len, flags);
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+	ret = btrfs_setxattr(trans, inode, handler->xattr_name, value,
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+			     value_len, flags);
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 	if (ret)
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 		return ret;
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 	ret = handler->apply(inode, value, value_len);
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 	if (ret) {
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-		btrfs_setxattr(trans, inode, handler->xattr_name,
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-				 NULL, 0, flags);
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+		btrfs_setxattr(trans, inode, handler->xattr_name, NULL,
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+			       0, flags);
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 		return ret;
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 	}
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108
 
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 	set_bit(BTRFS_INODE_HAS_PROPS, &BTRFS_I(inode)->runtime_flags);
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110
 
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 	return 0;
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-}
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-
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-int btrfs_set_prop(struct inode *inode,
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-		   const char *name,
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-		   const char *value,
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-		   size_t value_len,
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-		   int flags)
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-{
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-	return __btrfs_set_prop(NULL, inode, name, value, value_len, flags);
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 }
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113
 
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 static int iterate_object_props(struct btrfs_root *root,
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@@ -283,97 +252,18 @@
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 	return ret;
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 }
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254
 
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-static int inherit_props(struct btrfs_trans_handle *trans,
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-			 struct inode *inode,
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-			 struct inode *parent)
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-{
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-	struct btrfs_root *root = BTRFS_I(inode)->root;
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-	struct btrfs_fs_info *fs_info = root->fs_info;
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-	int ret;
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-	int i;
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-
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-	if (!test_bit(BTRFS_INODE_HAS_PROPS,
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-		      &BTRFS_I(parent)->runtime_flags))
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-		return 0;
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-
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-	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
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-		const struct prop_handler *h = &prop_handlers[i];
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-		const char *value;
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-		u64 num_bytes;
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-
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-		if (!h->inheritable)
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-			continue;
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-
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-		value = h->extract(parent);
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-		if (!value)
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-			continue;
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-
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-		num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
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-		ret = btrfs_block_rsv_add(root, trans->block_rsv,
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-					  num_bytes, BTRFS_RESERVE_NO_FLUSH);
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-		if (ret)
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-			goto out;
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-		ret = __btrfs_set_prop(trans, inode, h->xattr_name,
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-				       value, strlen(value), 0);
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-		btrfs_block_rsv_release(fs_info, trans->block_rsv, num_bytes);
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-		if (ret)
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-			goto out;
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-	}
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-	ret = 0;
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-out:
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-	return ret;
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-}
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-
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-int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
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-			      struct inode *inode,
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-			      struct inode *dir)
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-{
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-	if (!dir)
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-		return 0;
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-
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-	return inherit_props(trans, inode, dir);
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-}
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-
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-int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
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-			       struct btrfs_root *root,
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-			       struct btrfs_root *parent_root)
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-{
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-	struct super_block *sb = root->fs_info->sb;
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-	struct btrfs_key key;
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-	struct inode *parent_inode, *child_inode;
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-	int ret;
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-
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-	key.objectid = BTRFS_FIRST_FREE_OBJECTID;
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-	key.type = BTRFS_INODE_ITEM_KEY;
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-	key.offset = 0;
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-
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-	parent_inode = btrfs_iget(sb, &key, parent_root, NULL);
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-	if (IS_ERR(parent_inode))
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-		return PTR_ERR(parent_inode);
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-
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-	child_inode = btrfs_iget(sb, &key, root, NULL);
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-	if (IS_ERR(child_inode)) {
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-		iput(parent_inode);
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-		return PTR_ERR(child_inode);
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-	}
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-
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-	ret = inherit_props(trans, child_inode, parent_inode);
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-	iput(child_inode);
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-	iput(parent_inode);
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-
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-	return ret;
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-}
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-
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 static int prop_compression_validate(const char *value, size_t len)
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 {
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+	if (!value)
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+		return 0;
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+
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 	if (btrfs_compress_is_valid_type(value, len))
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 		return 0;
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262
 
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 	return -EINVAL;
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 }
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265
 
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-static int prop_compression_apply(struct inode *inode,
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-				  const char *value,
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+static int prop_compression_apply(struct inode *inode, const char *value,
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267
 				  size_t len)
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 {
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 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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@@ -420,4 +310,133 @@
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 	return NULL;
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 }
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312
 
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+static struct prop_handler prop_handlers[] = {
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+	{
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+		.xattr_name = XATTR_BTRFS_PREFIX "compression",
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+		.validate = prop_compression_validate,
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+		.apply = prop_compression_apply,
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+		.extract = prop_compression_extract,
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+		.inheritable = 1
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+	},
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+};
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+
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+static int inherit_props(struct btrfs_trans_handle *trans,
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+			 struct inode *inode,
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+			 struct inode *parent)
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+{
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+	struct btrfs_root *root = BTRFS_I(inode)->root;
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+	struct btrfs_fs_info *fs_info = root->fs_info;
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+	int ret;
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+	int i;
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+	bool need_reserve = false;
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+
333
+	if (!test_bit(BTRFS_INODE_HAS_PROPS,
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+		      &BTRFS_I(parent)->runtime_flags))
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+		return 0;
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+
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+	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
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+		const struct prop_handler *h = &prop_handlers[i];
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+		const char *value;
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+		u64 num_bytes = 0;
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+
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+		if (!h->inheritable)
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+			continue;
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+
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+		value = h->extract(parent);
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+		if (!value)
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+			continue;
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+
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+		/*
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+		 * This is not strictly necessary as the property should be
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+		 * valid, but in case it isn't, don't propagate it futher.
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+		 */
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+		ret = h->validate(value, strlen(value));
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+		if (ret)
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+			continue;
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+
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+		/*
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+		 * Currently callers should be reserving 1 item for properties,
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+		 * since we only have 1 property that we currently support.  If
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+		 * we add more in the future we need to try and reserve more
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+		 * space for them.  But we should also revisit how we do space
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+		 * reservations if we do add more properties in the future.
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+		 */
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+		if (need_reserve) {
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+			num_bytes = btrfs_calc_insert_metadata_size(fs_info, 1);
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+			ret = btrfs_block_rsv_add(root, trans->block_rsv,
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+					num_bytes, BTRFS_RESERVE_NO_FLUSH);
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+			if (ret)
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+				return ret;
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+		}
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+
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+		ret = btrfs_setxattr(trans, inode, h->xattr_name, value,
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+				     strlen(value), 0);
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+		if (!ret) {
375
+			ret = h->apply(inode, value, strlen(value));
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+			if (ret)
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+				btrfs_setxattr(trans, inode, h->xattr_name,
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+					       NULL, 0, 0);
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+			else
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+				set_bit(BTRFS_INODE_HAS_PROPS,
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+					&BTRFS_I(inode)->runtime_flags);
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+		}
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+
384
+		if (need_reserve) {
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+			btrfs_block_rsv_release(fs_info, trans->block_rsv,
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+					num_bytes, NULL);
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+			if (ret)
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+				return ret;
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+		}
390
+		need_reserve = true;
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+	}
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+
393
+	return 0;
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+}
395
+
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+int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
397
+			      struct inode *inode,
398
+			      struct inode *dir)
399
+{
400
+	if (!dir)
401
+		return 0;
402
+
403
+	return inherit_props(trans, inode, dir);
404
+}
405
+
406
+int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
407
+			       struct btrfs_root *root,
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+			       struct btrfs_root *parent_root)
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+{
410
+	struct super_block *sb = root->fs_info->sb;
411
+	struct inode *parent_inode, *child_inode;
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+	int ret;
413
+
414
+	parent_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, parent_root);
415
+	if (IS_ERR(parent_inode))
416
+		return PTR_ERR(parent_inode);
417
+
418
+	child_inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, root);
419
+	if (IS_ERR(child_inode)) {
420
+		iput(parent_inode);
421
+		return PTR_ERR(child_inode);
422
+	}
423
+
424
+	ret = inherit_props(trans, child_inode, parent_inode);
425
+	iput(child_inode);
426
+	iput(parent_inode);
427
+
428
+	return ret;
429
+}
430
+
431
+void __init btrfs_props_init(void)
432
+{
433
+	int i;
434
+
435
+	for (i = 0; i < ARRAY_SIZE(prop_handlers); i++) {
436
+		struct prop_handler *p = &prop_handlers[i];
437
+		u64 h = btrfs_name_hash(p->xattr_name, strlen(p->xattr_name));
438
+
439
+		hash_add(prop_handlers_ht, &p->node, h);
440
+	}
441
+}
423
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