From: Ackerley Tng <[email protected]> Verify that allocating folios in multiple guest_memfd instances sharing the same tmpfs resource pool consumes blocks from the underlying pool as reported by filesystem statistics.
Signed-off-by: Ackerley Tng <[email protected]> --- tools/testing/selftests/kvm/guest_memfd_test.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 81311be059923..4610eeab39be6 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -19,6 +19,7 @@ #include <sys/mount.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/statvfs.h> #include "kvm_syscalls.h" #include "kvm_util.h" @@ -545,7 +546,8 @@ static void test_resource_fd_tmpfs_huge(struct kvm_vm *vm) static void test_resource_fd_tmpfs_shared_pool(struct kvm_vm *vm) { - int pool_fd, fd1, fd2; + int pool_fd, fd1, fd2, ret; + struct statvfs svfs; struct stat st1, st2; pool_fd = create_tmpfs_pool_fd("never", true, page_size * 2); @@ -573,6 +575,18 @@ static void test_resource_fd_tmpfs_shared_pool(struct kvm_vm *vm) TEST_ASSERT(st1.st_ino != st2.st_ino, "different guest_memfd instances should have distinct inodes"); + ret = fallocate(fd1, FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate on fd1 should succeed"); + + TEST_ASSERT(!fstatvfs(pool_fd, &svfs), "fstatvfs on pool_fd should succeed"); + TEST_ASSERT_EQ(svfs.f_blocks - svfs.f_bfree, 1); + + ret = fallocate(fd2, FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate on fd2 should succeed"); + + TEST_ASSERT(!fstatvfs(pool_fd, &svfs), "fstatvfs on pool_fd should succeed"); + TEST_ASSERT_EQ(svfs.f_blocks - svfs.f_bfree, 2); + close(fd2); close(fd1); close(pool_fd); -- 2.56.0.rc1.315.gc6ed9934b7-goog
