fs/9p/vfs_file.c

98  * @fl: file lock structure
104 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
108 	p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
110 	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->c.flc_type != F_UNLCK) {
118 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
129 	BUG_ON((fl->c.flc_flags & FL_POSIX) != FL_POSIX);
131 	res = locks_lock_file_wait(filp, fl);
138 	switch (fl->c.flc_type) {
149 	flock.start = fl->fl_start;
150 	if (fl->fl_end == OFFSET_MAX)
153 		flock.length = fl->fl_end - fl->fl_start + 1;
154 	flock.proc_id = fl->c.flc_pid;
209 	if (res < 0 && fl->c.flc_type != F_UNLCK) {
210 		unsigned char type = fl->c.flc_type;
212 		fl->c.flc_type = F_UNLCK;
214 		locks_lock_file_wait(filp, fl);
215 		fl->c.flc_type = type;
223 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
232 	posix_test_lock(filp, fl);
237 	if (fl->c.flc_type != F_UNLCK)
243 	glock.start = fl->fl_start;
244 	if (fl->fl_end == OFFSET_MAX)
247 		glock.length = fl->fl_end - fl->fl_start + 1;
248 	glock.proc_id = fl->c.flc_pid;
257 		fl->c.flc_type = F_RDLCK;
260 		fl->c.flc_type = F_WRLCK;
263 		fl->c.flc_type = F_UNLCK;
267 		fl->fl_start = glock.start;
269 			fl->fl_end = OFFSET_MAX;
271 			fl->fl_end = glock.start + glock.length - 1;
272 		fl->c.flc_pid = -glock.proc_id;
284  * @fl: file lock structure
288 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
294 		 filp, cmd, fl, filp);
296 	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->c.flc_type != F_UNLCK) {
302 		ret = v9fs_file_do_lock(filp, cmd, fl);
304 		ret = v9fs_file_getlock(filp, fl);
314  * @fl: file lock structure
319 	struct file_lock *fl)
325 		 filp, cmd, fl, filp);
327 	if (!(fl->c.flc_flags & FL_FLOCK))
330 	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->c.flc_type != F_UNLCK) {
335 	fl->c.flc_flags |= FL_POSIX;
336 	fl->c.flc_flags ^= FL_FLOCK;
339 		ret = v9fs_file_do_lock(filp, cmd, fl);