config: remove HAVE_FILEMAP_RANGE_HAS_PAGE

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16479

module/os/linux/zfs/zfs_ctldir.c

@@ -500,9 +500,6 @@ zfsctl_inode_alloc(zfsvfs_t *zfsvfs, uint64_t id,
 	zp->z_atime_dirty = B_FALSE;
 	zp->z_zn_prefetch = B_FALSE;
 	zp->z_is_sa = B_FALSE;
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	zp->z_is_mapped = B_FALSE;
-#endif
 	zp->z_is_ctldir = B_TRUE;
 	zp->z_sa_hdl = NULL;
 	zp->z_blksz = 0;

module/os/linux/zfs/zfs_znode.c

@@ -535,9 +535,6 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 	ASSERT3P(zp->z_xattr_cached, ==, NULL);
 	zp->z_unlinked = B_FALSE;
 	zp->z_atime_dirty = B_FALSE;
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	zp->z_is_mapped = B_FALSE;
-#endif
 	zp->z_is_ctldir = B_FALSE;
 	zp->z_suspended = B_FALSE;
 	zp->z_sa_hdl = NULL;

module/os/linux/zfs/zpl_file.c

@@ -432,13 +432,6 @@ zpl_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (error)
 		return (error);
 
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	znode_t *zp = ITOZ(ip);
-	mutex_enter(&zp->z_lock);
-	zp->z_is_mapped = B_TRUE;
-	mutex_exit(&zp->z_lock);
-#endif
-
 	return (error);
 }