[PATCH v3 9/9] memfd-test: run fuse test on hugetlb backend memory

[Marc-André Lureau]

Suggested-by: Mike Kravetz <mike.krav...@oracle.com>
Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
---
 tools/testing/selftests/memfd/fuse_test.c      | 38 ++++++++++++++++++++------
 tools/testing/selftests/memfd/run_fuse_test.sh |  2 +-
 tools/testing/selftests/memfd/run_tests.sh     |  1 +
 3 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/memfd/fuse_test.c 
b/tools/testing/selftests/memfd/fuse_test.c
index 795a25ba8521..b018e835737d 100644
--- a/tools/testing/selftests/memfd/fuse_test.c
+++ b/tools/testing/selftests/memfd/fuse_test.c
@@ -38,6 +38,8 @@
 #define MFD_DEF_SIZE 8192
 #define STACK_SIZE 65536
 
+static size_t mfd_def_size = MFD_DEF_SIZE;
+
 static int mfd_assert_new(const char *name, loff_t sz, unsigned int flags)
 {
        int r, fd;
@@ -123,7 +125,7 @@ static void *mfd_assert_mmap_shared(int fd)
        void *p;
 
        p = mmap(NULL,
-                MFD_DEF_SIZE,
+                mfd_def_size,
                 PROT_READ | PROT_WRITE,
                 MAP_SHARED,
                 fd,
@@ -141,7 +143,7 @@ static void *mfd_assert_mmap_private(int fd)
        void *p;
 
        p = mmap(NULL,
-                MFD_DEF_SIZE,
+                mfd_def_size,
                 PROT_READ | PROT_WRITE,
                 MAP_PRIVATE,
                 fd,
@@ -174,7 +176,7 @@ static int sealing_thread_fn(void *arg)
        usleep(200000);
 
        /* unmount mapping before sealing to avoid i_mmap_writable failures */
-       munmap(global_p, MFD_DEF_SIZE);
+       munmap(global_p, mfd_def_size);
 
        /* Try sealing the global file; expect EBUSY or success. Current
         * kernels will never succeed, but in the future, kernels might
@@ -224,7 +226,7 @@ static void join_sealing_thread(pid_t pid)
 
 int main(int argc, char **argv)
 {
-       static const char zero[MFD_DEF_SIZE];
+       char *zero;
        int fd, mfd, r;
        void *p;
        int was_sealed;
@@ -235,6 +237,25 @@ int main(int argc, char **argv)
                abort();
        }
 
+       if (argc >= 3) {
+               if (!strcmp(argv[2], "hugetlbfs")) {
+                       unsigned long hpage_size = default_huge_page_size();
+
+                       if (!hpage_size) {
+                               printf("Unable to determine huge page size\n");
+                               abort();
+                       }
+
+                       hugetlbfs_test = 1;
+                       mfd_def_size = hpage_size * 2;
+               } else {
+                       printf("Unknown option: %s\n", argv[2]);
+                       abort();
+               }
+       }
+
+       zero = calloc(sizeof(*zero), mfd_def_size);
+
        /* open FUSE memfd file for GUP testing */
        printf("opening: %s\n", argv[1]);
        fd = open(argv[1], O_RDONLY | O_CLOEXEC);
@@ -245,7 +266,7 @@ int main(int argc, char **argv)
 
        /* create new memfd-object */
        mfd = mfd_assert_new("kern_memfd_fuse",
-                            MFD_DEF_SIZE,
+                            mfd_def_size,
                             MFD_CLOEXEC | MFD_ALLOW_SEALING);
 
        /* mmap memfd-object for writing */
@@ -264,7 +285,7 @@ int main(int argc, char **argv)
         * This guarantees that the receive-buffer is pinned for 1s until the
         * data is written into it. The racing ADD_SEALS should thus fail as
         * the pages are still pinned. */
-       r = read(fd, p, MFD_DEF_SIZE);
+       r = read(fd, p, mfd_def_size);
        if (r < 0) {
                printf("read() failed: %m\n");
                abort();
@@ -291,10 +312,10 @@ int main(int argc, char **argv)
         * enough to avoid any in-flight writes. */
 
        p = mfd_assert_mmap_private(mfd);
-       if (was_sealed && memcmp(p, zero, MFD_DEF_SIZE)) {
+       if (was_sealed && memcmp(p, zero, mfd_def_size)) {
                printf("memfd sealed during read() but data not discarded\n");
                abort();
-       } else if (!was_sealed && !memcmp(p, zero, MFD_DEF_SIZE)) {
+       } else if (!was_sealed && !memcmp(p, zero, mfd_def_size)) {
                printf("memfd sealed after read() but data discarded\n");
                abort();
        }
@@ -303,6 +324,7 @@ int main(int argc, char **argv)
        close(fd);
 
        printf("fuse: DONE\n");
+       free(zero);
 
        return 0;
 }
diff --git a/tools/testing/selftests/memfd/run_fuse_test.sh 
b/tools/testing/selftests/memfd/run_fuse_test.sh
index 407df68dfe27..22e572e2d66a 100755
--- a/tools/testing/selftests/memfd/run_fuse_test.sh
+++ b/tools/testing/selftests/memfd/run_fuse_test.sh
@@ -10,6 +10,6 @@ set -e
 
 mkdir mnt
 ./fuse_mnt ./mnt
-./fuse_test ./mnt/memfd
+./fuse_test ./mnt/memfd $@
 fusermount -u ./mnt
 rmdir ./mnt
diff --git a/tools/testing/selftests/memfd/run_tests.sh 
b/tools/testing/selftests/memfd/run_tests.sh
index daabb350697c..c2d41ed81b24 100755
--- a/tools/testing/selftests/memfd/run_tests.sh
+++ b/tools/testing/selftests/memfd/run_tests.sh
@@ -60,6 +60,7 @@ fi
 # Run the hugetlbfs test
 #
 ./memfd_test hugetlbfs
+./run_fuse_test.sh hugetlbfs
 
 #
 # Give back any huge pages allocated for the test
-- 
2.15.0.125.g8f49766d64