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authorMarc-André Lureau <marcandre.lureau@redhat.com>2018-02-01 03:19:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 04:18:39 +0300
commitff62a34210441103108d435ae8a00a777c4dcb99 (patch)
tree02df0de924782bd15978220e80180b04b669c358 /include/linux/hugetlb.h
parentda14c1e524a56d62b846f73ae44fd722d63747b6 (diff)
downloadlinux-ff62a34210441103108d435ae8a00a777c4dcb99.tar.xz
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/hugetlb.h')
-rw-r--r--include/linux/hugetlb.h1
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)