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authorMarc-André Lureau <marcandre.lureau@redhat.com>2018-01-31 16:19:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:38 -0800
commite9d586a8217882eb4068e3ed94a5234ba6dead34 (patch)
tree327c819c3cac67a572834c3eb65f0deefc898364 /mm/shmem.c
parentab8928b72fd77d936034da4c077f1580619697f4 (diff)
downloadlinux-e9d586a8217882eb4068e3ed94a5234ba6dead34.tar.bz2
shmem: unexport shmem_add_seals()/shmem_get_seals()
Patch series "memfd: add sealing to hugetlb-backed memory", v3. Recently, Mike Kravetz added hugetlbfs support to memfd. However, he didn't add sealing support. One of the reasons to use memfd is to have shared memory sealing when doing IPC or sharing memory with another process with some extra safety. qemu uses shared memory & hugetables with vhost-user (used by dpdk), so it is reasonable to use memfd now instead for convenience and security reasons. This patch (of 9): The functions are called through shmem_fcntl() only. And no danger in removing the EXPORTs as the routines only work with shmem file structs. Link: http://lkml.kernel.org/r/20171107122800.25517-2-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 'mm/shmem.c')
-rw-r--r--mm/shmem.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 7fbe67be86fa..975efd81621f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2722,7 +2722,7 @@ continue_resched:
F_SEAL_GROW | \
F_SEAL_WRITE)
-int shmem_add_seals(struct file *file, unsigned int seals)
+static int shmem_add_seals(struct file *file, unsigned int seals)
{
struct inode *inode = file_inode(file);
struct shmem_inode_info *info = SHMEM_I(inode);
@@ -2791,16 +2791,14 @@ unlock:
inode_unlock(inode);
return error;
}
-EXPORT_SYMBOL_GPL(shmem_add_seals);
-int shmem_get_seals(struct file *file)
+static int shmem_get_seals(struct file *file)
{
if (file->f_op != &shmem_file_operations)
return -EINVAL;
return SHMEM_I(file_inode(file))->seals;
}
-EXPORT_SYMBOL_GPL(shmem_get_seals);
long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{