fs: compat_ioctl: move FITRIM emulation into file systems

Remove the special case for FITRIM, and make file systems
handle that like all other ioctl commands with their own
handlers.

Cc: [e-mail]
Cc: [e-mail]
Cc: Mikulas Patocka <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Arnd Bergmann <[e-mail]>

fs/compat_ioctl.c

···
 static unsigned int ioctl_pointer[] = {
 /* Little t */
 COMPATIBLE_IOCTL(TIOCOUTQ)
-/* 'X' - originally XFS but some now in the VFS */
-COMPATIBLE_IOCTL(FITRIM)
 #ifdef CONFIG_BLOCK
 /* Big S */
 COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)

fs/ecryptfs/file.c

···
 		return rc;
 
 	switch (cmd) {
+	case FITRIM:
 	case FS_IOC32_GETFLAGS:
 	case FS_IOC32_SETFLAGS:
 	case FS_IOC32_GETVERSION:

fs/ext4/ioctl.c

···
 	}
 	case EXT4_IOC_MOVE_EXT:
 	case EXT4_IOC_RESIZE_FS:
+	case FITRIM:
 	case EXT4_IOC_PRECACHE_EXTENTS:
 	case EXT4_IOC_SET_ENCRYPTION_POLICY:
 	case EXT4_IOC_GET_ENCRYPTION_PWSALT:

fs/f2fs/file.c

···
 	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
 	case F2FS_IOC_ABORT_VOLATILE_WRITE:
 	case F2FS_IOC_SHUTDOWN:
+	case FITRIM:
 	case F2FS_IOC_SET_ENCRYPTION_POLICY:
 	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
 	case F2FS_IOC_GET_ENCRYPTION_POLICY:

fs/hpfs/dir.c

···
 	.release	= hpfs_dir_release,
 	.fsync		= hpfs_file_fsync,
 	.unlocked_ioctl	= hpfs_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };

fs/hpfs/file.c

···
 	.fsync		= hpfs_file_fsync,
 	.splice_read	= generic_file_splice_read,
 	.unlocked_ioctl	= hpfs_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
 };
 
 const struct inode_operations hpfs_file_iops =

fs/nilfs2/ioctl.c

···
 	case NILFS_IOCTL_SYNC:
 	case NILFS_IOCTL_RESIZE:
 	case NILFS_IOCTL_SET_ALLOC_RANGE:
+	case FITRIM:
 		break;
 	default:
 		return -ENOIOCTLCMD;

fs/ocfs2/ioctl.c

···
 			return -EFAULT;
 
 		return ocfs2_info_handle(inode, &info, 1);
+	case FITRIM:
 	case OCFS2_IOC_MOVE_EXT:
 		break;
 	default: