LU-16321 osd: Allow fiemap on kernel buffers

Linux commit v5.17-rc3-19-g967747bbc084
  uaccess: remove CONFIG_SET_FS

When KERNEL_DS gone lustre needs an alternative for fiemap to
copy extents to kernel space memory.

Direct in-kernel calls to inode->f_ops->fiemap() can utilize
an otherwise unused flag on fiemap_extent_info fi_flags
to indicate the fiemap extent buffer is allocated in kernel space.

Include ldiskfs patches for ldiskfs_fiemap() to
define EXT4_FIEMAP_FLAG_MEMCPY and utilize it.

HPE-bug-id: LUS-11337
Fixes: d0337cab8e ("LU-14195 osd: don't use set_fs() for ->fiemap() calls.")
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I7a8edb481833fd1bdcf7b6cd6e08397c1754baee
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49190
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>