diff options
| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2018-01-31 16:19:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 17:18:39 -0800 |
| commit | ff62a34210441103108d435ae8a00a777c4dcb99 (patch) | |
| tree | 02df0de924782bd15978220e80180b04b669c358 /include/linux | |
| parent | da14c1e524a56d62b846f73ae44fd722d63747b6 (diff) | |
| download | linux-rt-ff62a34210441103108d435ae8a00a777c4dcb99.tar.gz | |
hugetlb: implement memfd sealing
Implements memfd sealing, similar to shmem:
- WRITE: deny fallocate(PUNCH_HOLE). mmap() write is denied in
memfd_add_seals(). write() doesn't exist for hugetlbfs.
- SHRINK: added similar check as shmem_setattr()
- GROW: added similar check as shmem_setattr() & shmem_fallocate()
Except write() operation that doesn't exist with hugetlbfs, that should
make sealing as close as it can be to shmem support.
Link: http://lkml.kernel.org/r/20171107122800.25517-5-marcandre.lureau@redhat.com
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hugetlb.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index d02301e3f232..944e6e8bd572 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -273,6 +273,7 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) struct hugetlbfs_inode_info { struct shared_policy policy; struct inode vfs_inode; + unsigned int seals; }; static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) |