linux-master/fs/xattr.c

46 #define for_each_xattr_handler(handlers, handler)		\
48 		for ((handler) = *(handlers)++;			\
49 			(handler) != NULL;			\
50 			(handler) = *(handlers)++)
59 	const struct xattr_handler *handler;
66 	for_each_xattr_handler(handlers, handler) {
69 		n = strcmp_prefix(*name, xattr_prefix(handler));
71 			if (!handler->prefix ^ !*n) {
77 			return handler;
159  * Look for any handler that deals with the specified namespace.
165 	const struct xattr_handler *handler;
173 	for_each_xattr_handler(handlers, handler) {
174 		if (!strncmp(xattr_prefix(handler), XATTR_USER_PREFIX,
188 	const struct xattr_handler *handler;
193 	handler = xattr_resolve_name(inode, &name);
194 	if (IS_ERR(handler))
195 		return PTR_ERR(handler);
196 	if (!handler->set)
200 	return handler->set(handler, idmap, dentry, inode, name, value,
379 	const struct xattr_handler *handler;
388 	handler = xattr_resolve_name(inode, &name);
389 	if (IS_ERR(handler))
390 		return PTR_ERR(handler);
391 	if (!handler->get)
393 	error = handler->get(handler, dentry, inode, name, NULL, 0);
404 	error = handler->get(handler, dentry, inode, name, value, error);
413 	const struct xattr_handler *handler;
418 	handler = xattr_resolve_name(inode, &name);
419 	if (IS_ERR(handler))
420 		return PTR_ERR(handler);
421 	if (!handler->get)
423 	return handler->get(handler, dentry, inode, name, value, size);
508 	const struct xattr_handler *handler;
513 	handler = xattr_resolve_name(inode, &name);
514 	if (IS_ERR(handler))
515 		return PTR_ERR(handler);
516 	if (!handler->set)
518 	return handler->set(handler, idmap, dentry, inode, name, NULL, 0,
1001 	const struct xattr_handler *handler, * const *handlers = dentry->d_sb->s_xattr;
1005 	for_each_xattr_handler(handlers, handler) {
1006 		if (!handler->name || (handler->list && !handler->list(dentry)))
1008 		err = xattr_list_one(&buffer, &remaining_size, handler->name);
1020  * @handler:	handler of the xattr_handler operation
1023  * The get and set xattr handler operations are called with the remainder of
1024  * the attribute name after skipping the handler's prefix: for example, "foo"
1025  * is passed to the get operation of a handler with prefix "user." to get
1028  * Note: the list xattr handler operation when called from the vfs is passed a
1032 const char *xattr_full_name(const struct xattr_handler *handler,
1035 	size_t prefix_len = strlen(xattr_prefix(handler));