memfd-test: test hugetlbfs sealing

Remove most of the special-casing of hugetlbfs now that sealing is
supported.

Link: http://lkml.kernel.org/r/20171107122800.25517-7-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>

diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
index 132a54f74e883963bf45a42cfc17533a306e8bd6..59ca090e9752bd0ed991d22dc52d10ef14caa391 100644 (file)
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -513,6 +513,10 @@ static void mfd_assert_grow_write(int fd)
        static char *buf;
        ssize_t l;
 
+       /* hugetlbfs does not support write */
+       if (hugetlbfs_test)
+               return;
+
        buf = malloc(mfd_def_size * 8);
        if (!buf) {
                printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
@@ -533,6 +537,10 @@ static void mfd_fail_grow_write(int fd)
        static char *buf;
        ssize_t l;
 
+       /* hugetlbfs does not support write */
+       if (hugetlbfs_test)
+               return;
+
        buf = malloc(mfd_def_size * 8);
        if (!buf) {
                printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
@@ -627,18 +635,13 @@ static void test_create(void)
        fd = mfd_assert_new("", 0, MFD_CLOEXEC);
        close(fd);
 
-       if (!hugetlbfs_test) {
-               /* verify MFD_ALLOW_SEALING is allowed */
-               fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING);
-               close(fd);
-
-               /* verify MFD_ALLOW_SEALING | MFD_CLOEXEC is allowed */
-               fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING | MFD_CLOEXEC);
-               close(fd);
-       } else {
-               /* sealing is not supported on hugetlbfs */
-               mfd_fail_new("", MFD_ALLOW_SEALING);
-       }
+       /* verify MFD_ALLOW_SEALING is allowed */
+       fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING);
+       close(fd);
+
+       /* verify MFD_ALLOW_SEALING | MFD_CLOEXEC is allowed */
+       fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING | MFD_CLOEXEC);
+       close(fd);
 }
 
 /*
@@ -649,10 +652,6 @@ static void test_basic(void)
 {
        int fd;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s BASIC\n", MEMFD_STR);
 
        fd = mfd_assert_new("kern_memfd_basic",
@@ -697,28 +696,6 @@ static void test_basic(void)
        close(fd);
 }
 
-/*
- * hugetlbfs doesn't support seals or write, so just verify grow and shrink
- * on a hugetlbfs file created via memfd_create.
- */
-static void test_hugetlbfs_grow_shrink(void)
-{
-       int fd;
-
-       printf("%s HUGETLBFS-GROW-SHRINK\n", MEMFD_STR);
-
-       fd = mfd_assert_new("kern_memfd_seal_write",
-                           mfd_def_size,
-                           MFD_CLOEXEC);
-
-       mfd_assert_read(fd);
-       mfd_assert_write(fd);
-       mfd_assert_shrink(fd);
-       mfd_assert_grow(fd);
-
-       close(fd);
-}
-
 /*
  * Test SEAL_WRITE
  * Test whether SEAL_WRITE actually prevents modifications.
@@ -727,13 +704,6 @@ static void test_seal_write(void)
 {
        int fd;
 
-       /*
-        * hugetlbfs does not contain sealing or write support.  Just test
-        * basic grow and shrink via test_hugetlbfs_grow_shrink.
-        */
-       if (hugetlbfs_test)
-               return test_hugetlbfs_grow_shrink();
-
        printf("%s SEAL-WRITE\n", MEMFD_STR);
 
        fd = mfd_assert_new("kern_memfd_seal_write",
@@ -760,10 +730,6 @@ static void test_seal_shrink(void)
 {
        int fd;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s SEAL-SHRINK\n", MEMFD_STR);
 
        fd = mfd_assert_new("kern_memfd_seal_shrink",
@@ -790,10 +756,6 @@ static void test_seal_grow(void)
 {
        int fd;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s SEAL-GROW\n", MEMFD_STR);
 
        fd = mfd_assert_new("kern_memfd_seal_grow",
@@ -820,10 +782,6 @@ static void test_seal_resize(void)
 {
        int fd;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s SEAL-RESIZE\n", MEMFD_STR);
 
        fd = mfd_assert_new("kern_memfd_seal_resize",
@@ -842,32 +800,6 @@ static void test_seal_resize(void)
        close(fd);
 }
 
-/*
- * hugetlbfs does not support seals.  Basic test to dup the memfd created
- * fd and perform some basic operations on it.
- */
-static void hugetlbfs_dup(char *b_suffix)
-{
-       int fd, fd2;
-
-       printf("%s HUGETLBFS-DUP %s\n", MEMFD_STR, b_suffix);
-
-       fd = mfd_assert_new("kern_memfd_share_dup",
-                           mfd_def_size,
-                           MFD_CLOEXEC);
-
-       fd2 = mfd_assert_dup(fd);
-
-       mfd_assert_read(fd);
-       mfd_assert_write(fd);
-
-       mfd_assert_shrink(fd2);
-       mfd_assert_grow(fd2);
-
-       close(fd2);
-       close(fd);
-}
-
 /*
  * Test sharing via dup()
  * Test that seals are shared between dupped FDs and they're all equal.
@@ -876,15 +808,6 @@ static void test_share_dup(char *banner, char *b_suffix)
 {
        int fd, fd2;
 
-       /*
-        * hugetlbfs does not contain sealing support.  Perform some
-        * basic testing on dup'ed fd instead via hugetlbfs_dup.
-        */
-       if (hugetlbfs_test) {
-               hugetlbfs_dup(b_suffix);
-               return;
-       }
-
        printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
 
        fd = mfd_assert_new("kern_memfd_share_dup",
@@ -927,10 +850,6 @@ static void test_share_mmap(char *banner, char *b_suffix)
        int fd;
        void *p;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s %s %s\n", MEMFD_STR,  banner, b_suffix);
 
        fd = mfd_assert_new("kern_memfd_share_mmap",
@@ -955,32 +874,6 @@ static void test_share_mmap(char *banner, char *b_suffix)
        close(fd);
 }
 
-/*
- * Basic test to make sure we can open the hugetlbfs fd via /proc and
- * perform some simple operations on it.
- */
-static void hugetlbfs_proc_open(char *b_suffix)
-{
-       int fd, fd2;
-
-       printf("%s HUGETLBFS-PROC-OPEN %s\n", MEMFD_STR, b_suffix);
-
-       fd = mfd_assert_new("kern_memfd_share_open",
-                           mfd_def_size,
-                           MFD_CLOEXEC);
-
-       fd2 = mfd_assert_open(fd, O_RDWR, 0);
-
-       mfd_assert_read(fd);
-       mfd_assert_write(fd);
-
-       mfd_assert_shrink(fd2);
-       mfd_assert_grow(fd2);
-
-       close(fd2);
-       close(fd);
-}
-
 /*
  * Test sealing with open(/proc/self/fd/%d)
  * Via /proc we can get access to a separate file-context for the same memfd.
@@ -991,15 +884,6 @@ static void test_share_open(char *banner, char *b_suffix)
 {
        int fd, fd2;
 
-       /*
-        * hugetlbfs does not contain sealing support.  So test basic
-        * functionality of using /proc fd via hugetlbfs_proc_open
-        */
-       if (hugetlbfs_test) {
-               hugetlbfs_proc_open(b_suffix);
-               return;
-       }
-
        printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
 
        fd = mfd_assert_new("kern_memfd_share_open",
@@ -1043,10 +927,6 @@ static void test_share_fork(char *banner, char *b_suffix)
        int fd;
        pid_t pid;
 
-       /* hugetlbfs does not contain sealing support */
-       if (hugetlbfs_test)
-               return;
-
        printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
 
        fd = mfd_assert_new("kern_memfd_share_fork",