tmpfs: test link accounting with O_TMPFILE (a3322868) · Commits · 戴 / test

tools/testing/selftests/Makefile

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		@@ -48,6 +48,7 @@ TARGETS += sysctl
		ifneq (1, $(quicktest))
		TARGETS += timers
		endif
		TARGETS += tmpfs
		TARGETS += user
		TARGETS += vm
		TARGETS += x86

tools/testing/selftests/tmpfs/.gitignore

0 → 100644

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		/bug-link-o-tmpfile

tools/testing/selftests/tmpfs/Makefile

0 → 100644

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		CFLAGS += -Wall -O2
		CFLAGS += -D_GNU_SOURCE

		TEST_GEN_PROGS :=
		TEST_GEN_PROGS += bug-link-o-tmpfile

		include ../lib.mk

tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c

0 → 100644

+67 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2019 Alexey Dobriyan <adobriyan@gmail.com>
		*
		* Permission to use, copy, modify, and distribute this software for any
		* purpose with or without fee is hereby granted, provided that the above
		* copyright notice and this permission notice appear in all copies.
		*
		* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
		* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
		* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
		* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
		* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
		* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
		* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
		*/
		/* Test that open(O_TMPFILE), linkat() doesn't screw accounting. */
		#include <errno.h>
		#include <sched.h>
		#include <stdio.h>
		#include <sys/types.h>
		#include <sys/stat.h>
		#include <fcntl.h>
		#include <sys/mount.h>
		#include <unistd.h>

		int main(void)
		{
		int fd;

		if (unshare(CLONE_NEWNS) == -1) {
		if (errno == ENOSYS \|\| errno == EPERM) {
		fprintf(stderr, "error: unshare, errno %d\n", errno);
		return 4;
		}
		fprintf(stderr, "error: unshare, errno %d\n", errno);
		return 1;
		}
		if (mount(NULL, "/", NULL, MS_PRIVATE\|MS_REC, NULL) == -1) {
		fprintf(stderr, "error: mount '/', errno %d\n", errno);
		return 1;
		}

		/* Our heroes: 1 root inode, 1 O_TMPFILE inode, 1 permanent inode. */
		if (mount(NULL, "/tmp", "tmpfs", 0, "nr_inodes=3") == -1) {
		fprintf(stderr, "error: mount tmpfs, errno %d\n", errno);
		return 1;
		}

		fd = openat(AT_FDCWD, "/tmp", O_WRONLY\|O_TMPFILE, 0600);
		if (fd == -1) {
		fprintf(stderr, "error: open 1, errno %d\n", errno);
		return 1;
		}
		if (linkat(fd, "", AT_FDCWD, "/tmp/1", AT_EMPTY_PATH) == -1) {
		fprintf(stderr, "error: linkat, errno %d\n", errno);
		return 1;
		}
		close(fd);

		fd = openat(AT_FDCWD, "/tmp", O_WRONLY\|O_TMPFILE, 0600);
		if (fd == -1) {
		fprintf(stderr, "error: open 2, errno %d\n", errno);
		return 1;
		}

		return 0;
		}

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