locks: pass the cmd value to fcntl_getlk/getlk64

Once we introduce file private locks, we'll need to know what cmd value
was used, as that affects the ownership and whether a conflict would
arise.
Signed-off-by: Jeff Layton <jlayton@redhat.com>

fs/fcntl.c

@@ -273,7 +273,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
 		err = setfl(fd, filp, arg);
 		break;
 	case F_GETLK:
-		err = fcntl_getlk(filp, (struct flock __user *) arg);
+		err = fcntl_getlk(filp, cmd, (struct flock __user *) arg);
 		break;
 	case F_SETLK:
 	case F_SETLKW:
@@ -389,7 +389,7 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
 	
 	switch (cmd) {
 		case F_GETLK64:
-			err = fcntl_getlk64(f.file, (struct flock64 __user *) arg);
+			err = fcntl_getlk64(f.file, cmd, (struct flock64 __user *) arg);
 			break;
 		case F_SETLK64:
 		case F_SETLKW64:

fs/locks.c

@@ -1898,7 +1898,7 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
 /* Report the first existing lock that would conflict with l.
  * This implements the F_GETLK command of fcntl().
  */
-int fcntl_getlk(struct file *filp, struct flock __user *l)
+int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
 {
 	struct file_lock file_lock;
 	struct flock flock;
@@ -2066,7 +2066,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
 /* Report the first existing lock that would conflict with l.
  * This implements the F_GETLK command of fcntl().
  */
-int fcntl_getlk64(struct file *filp, struct flock64 __user *l)
+int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
 {
 	struct file_lock file_lock;
 	struct flock64 flock;

include/linux/fs.h

@@ -993,12 +993,12 @@ struct file_lock {
 extern void send_sigio(struct fown_struct *fown, int fd, int band);
 
 #ifdef CONFIG_FILE_LOCKING
-extern int fcntl_getlk(struct file *, struct flock __user *);
+extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
 			struct flock __user *);
 
 #if BITS_PER_LONG == 32
-extern int fcntl_getlk64(struct file *, struct flock64 __user *);
+extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *);
 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
 			struct flock64 __user *);
 #endif
@@ -1031,7 +1031,8 @@ extern int lease_modify(struct file_lock **, int);
 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
 #else /* !CONFIG_FILE_LOCKING */
-static inline int fcntl_getlk(struct file *file, struct flock __user *user)
+static inline int fcntl_getlk(struct file *file, unsigned int cmd,
+			      struct flock __user *user)
 {
 	return -EINVAL;
 }
@@ -1043,7 +1044,8 @@ static inline int fcntl_setlk(unsigned int fd, struct file *file,
 }
 
 #if BITS_PER_LONG == 32
-static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
+static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
+				struct flock64 __user *user)
 {
 	return -EINVAL;
 }