[00/16] tmpfs: HUGEPAGE and MEM_LOCK fcntls and memfds

Message

Hugh Dickins July 30, 2021, 7:22 a.m. UTC

A series of HUGEPAGE and MEM_LOCK tmpfs fcntls and memfd_create flags,
after fixes (not essential for stable) and cleanups in related areas.

Against 5.14-rc3: currently no conflict with linux-next or mmotm.

01/16 huge tmpfs: fix fallocate(vanilla) advance over huge pages
02/16 huge tmpfs: fix split_huge_page() after FALLOC_FL_KEEP_SIZE
03/16 huge tmpfs: remove shrinklist addition from shmem_setattr()
04/16 huge tmpfs: revert shmem's use of transhuge_vma_enabled()
05/16 huge tmpfs: move shmem_huge_enabled() upwards
06/16 huge tmpfs: shmem_is_huge(vma, inode, index)
07/16 memfd: memfd_create(name, MFD_HUGEPAGE) for shmem huge pages
08/16 huge tmpfs: fcntl(fd, F_HUGEPAGE) and fcntl(fd, F_NOHUGEPAGE)
09/16 huge tmpfs: decide stat.st_blksize by shmem_is_huge()
10/16 tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file
11/16 tmpfs: fcntl(fd, F_MEM_LOCKED) to test if memlocked
12/16 tmpfs: refuse memlock when fallocated beyond i_size
13/16 mm: bool user_shm_lock(loff_t size, struct ucounts *)
14/16 mm: user_shm_lock(,,getuc) and user_shm_unlock(,,putuc)
15/16 tmpfs: permit changing size of memlocked file
16/16 memfd: memfd_create(name, MFD_MEM_LOCK) for memlocked shmem

 fs/fcntl.c                 |    8 
 fs/hugetlbfs/inode.c       |    4 
 include/linux/mm.h         |    4 
 include/linux/shmem_fs.h   |   31 ++-
 include/uapi/linux/fcntl.h |   17 +
 include/uapi/linux/memfd.h |    4 
 ipc/shm.c                  |    4 
 mm/huge_memory.c           |    6 
 mm/khugepaged.c            |    2 
 mm/memfd.c                 |   27 ++
 mm/mlock.c                 |   19 -
 mm/shmem.c                 |  397 ++++++++++++++++++++++++++-------------
 12 files changed, 370 insertions(+), 153 deletions(-)

Hugh