On 04/15/2018 12:21 PM, Mike Kravetz wrote:
With the addition of memfd hugetlbfs support, we now have the situation where memfd depends on TMPFS -or- HUGETLBFS. Previously, memfd was only supported on tmpfs, so it made sense that the code resided in shmem.c. In the current code, memfd is only functional if TMPFS is defined. If HUGETLFS is defined and TMPFS is not defined, then memfd functionality will not be available for hugetlbfs. This does not cause BUGs, just a lack of potentially desired functionality. Code is restructured in the following way: - include/linux/memfd.h is a new file containing memfd specific definitions previously contained in shmem_fs.h. - mm/memfd.c is a new file containing memfd specific code previously contained in shmem.c. - memfd specific code is removed from shmem_fs.h and shmem.c. - A new config option MEMFD_CREATE is added that is defined if TMPFS or HUGETLBFS is defined. No functional changes are made to the code: restructuring only. Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> --- fs/Kconfig | 3 + fs/fcntl.c | 2 +- include/linux/memfd.h | 16 +++ include/linux/shmem_fs.h | 13 -- mm/Makefile | 1 + mm/memfd.c | 345 +++++++++++++++++++++++++++++++++++++++++++++++ mm/shmem.c | 324 -------------------------------------------- 7 files changed, 366 insertions(+), 338 deletions(-) create mode 100644 include/linux/memfd.h create mode 100644 mm/memfd.c
Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
