filelock: move file locking definitions to separate header file

The file locking definitions have lived in fs.h since the dawn of time,
but they are only used by a small subset of the source files that
include it.

Move the file locking definitions to a new header file, and add the
appropriate #include directives to the source files that need them. By
doing this we trim down fs.h a bit and limit the amount of rebuilding
that has to be done when we make changes to the file locking APIs.

Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Steve French <stfrench@microsoft.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>

arch/arm/kernel/sys_oabi-compat.c

@@ -73,6 +73,7 @@
 #include <linux/syscalls.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/cred.h>
 #include <linux/fcntl.h>
 #include <linux/eventpoll.h>

fs/9p/vfs_file.c

@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/sched.h>
 #include <linux/file.h>
 #include <linux/stat.h>

fs/afs/internal.h

@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/ktime.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/pagemap.h>
 #include <linux/rxrpc.h>
 #include <linux/key.h>

fs/attr.c

@@ -14,6 +14,7 @@
 #include <linux/capability.h>
 #include <linux/fsnotify.h>
 #include <linux/fcntl.h>
+#include <linux/filelock.h>
 #include <linux/security.h>
 #include <linux/evm.h>
 #include <linux/ima.h>

fs/ceph/caps.c

@@ -9,6 +9,7 @@
 #include <linux/wait.h>
 #include <linux/writeback.h>
 #include <linux/iversion.h>
+#include <linux/filelock.h>
 
 #include "super.h"
 #include "mds_client.h"

fs/ceph/locks.c

@@ -7,6 +7,7 @@
 
 #include "super.h"
 #include "mds_client.h"
+#include <linux/filelock.h>
 #include <linux/ceph/pagelist.h>
 
 static u64 lock_secret;

fs/cifs/cifsfs.c

@@ -12,6 +12,7 @@
 
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/mount.h>
 #include <linux/slab.h>
 #include <linux/init.h>

fs/cifs/cifsglob.h

@@ -26,6 +26,7 @@
 #include <uapi/linux/cifs/cifs_mount.h>
 #include "../smbfs_common/smb2pdu.h"
 #include "smb2pdu.h"
+#include <linux/filelock.h>
 
 #define SMB_PATH_MAX 260
 #define CIFS_PORT 445

fs/cifs/cifssmb.c

@@ -15,6 +15,7 @@
  /* want to reuse a stale file handle and only the caller knows the file info */
 
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/kernel.h>
 #include <linux/vfs.h>
 #include <linux/slab.h>

fs/cifs/file.c

@@ -9,6 +9,7 @@
  *
  */
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/backing-dev.h>
 #include <linux/stat.h>
 #include <linux/fcntl.h>

fs/cifs/smb2file.c

@@ -7,6 +7,7 @@
  *
  */
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/stat.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>

fs/dlm/plock.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/miscdevice.h>
 #include <linux/poll.h>
 #include <linux/dlm.h>

fs/fcntl.c

@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <linux/sched/task.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/file.h>
 #include <linux/fdtable.h>
 #include <linux/capability.h>

fs/file_table.c

@@ -13,6 +13,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/security.h>
 #include <linux/cred.h>
 #include <linux/eventpoll.h>

fs/fuse/file.c

@@ -18,6 +18,7 @@
 #include <linux/falloc.h>
 #include <linux/uio.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 
 static int fuse_send_open(struct fuse_mount *fm, u64 nodeid,
 			  unsigned int open_flags, int opcode,

fs/gfs2/file.c

@@ -15,6 +15,7 @@
 #include <linux/mm.h>
 #include <linux/mount.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/falloc.h>
 #include <linux/swap.h>

fs/inode.c

@@ -5,6 +5,7 @@
  */
 #include <linux/export.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/mm.h>
 #include <linux/backing-dev.h>
 #include <linux/hash.h>

fs/ksmbd/smb2pdu.c

@@ -12,6 +12,7 @@
 #include <linux/ethtool.h>
 #include <linux/falloc.h>
 #include <linux/mount.h>
+#include <linux/filelock.h>
 
 #include "glob.h"
 #include "smbfsctl.h"

fs/ksmbd/vfs.c

@@ -6,6 +6,7 @@
 
 #include <linux/kernel.h>
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/uaccess.h>
 #include <linux/backing-dev.h>
 #include <linux/writeback.h>

fs/ksmbd/vfs_cache.c

@@ -5,6 +5,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/filelock.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>