3  *  linux/fs/filesystems.c
11 #include <linux/fs.h>
38 struct file_system_type *get_filesystem(struct file_system_type *fs)  in get_filesystem()  argument
40 	__module_get(fs->owner);  in get_filesystem()
41 	return fs;  in get_filesystem()
44 void put_filesystem(struct file_system_type *fs)  in put_filesystem()  argument
46 	module_put(fs->owner);  in put_filesystem()
61  *	@fs: the file system structure
72 int register_filesystem(struct file_system_type * fs)  in register_filesystem()  argument
77 	if (fs->parameters &&  in register_filesystem()
78 	    !fs_validate_description(fs->name, fs->parameters))  in register_filesystem()
81 	BUG_ON(strchr(fs->name, '.'));  in register_filesystem()
82 	if (fs->next)  in register_filesystem()
85 	p = find_filesystem(fs->name, strlen(fs->name));  in register_filesystem()
89 		*p = fs;  in register_filesystem()
98  *	@fs: filesystem to unregister
108 int unregister_filesystem(struct file_system_type * fs)  in unregister_filesystem()  argument
115 		if (fs == *tmp) {  in unregister_filesystem()
116 			*tmp = fs->next;  in unregister_filesystem()
117 			fs->next = NULL;  in unregister_filesystem()
256 	struct file_system_type *fs;  in __get_fs_type()  local
259 	fs = *(find_filesystem(name, len));  in __get_fs_type()
260 	if (fs && !try_module_get(fs->owner))  in __get_fs_type()
261 		fs = NULL;  in __get_fs_type()
263 	return fs;  in __get_fs_type()
268 	struct file_system_type *fs;  in get_fs_type()  local
272 	fs = __get_fs_type(name, len);  in get_fs_type()
273 	if (!fs && (request_module("fs-%.*s", len, name) == 0)) {  in get_fs_type()
274 		fs = __get_fs_type(name, len);  in get_fs_type()
275 		if (!fs)  in get_fs_type()
276 			pr_warn_once("request_module fs-%.*s succeeded, but still no fs?\n",  in get_fs_type()
280 	if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) {  in get_fs_type()
281 		put_filesystem(fs);  in get_fs_type()
282 		fs = NULL;  in get_fs_type()
284 	return fs;  in get_fs_type()