[CRIU] [PATCH v8] zdtm: Add a test to check if we can C/R ghost files with no parent dirs.
Andrei Vagin
avagin at virtuozzo.com
Fri Apr 6 02:38:37 MSK 2018
Applied with minor fixes, thanks!
On Mon, Apr 02, 2018 at 10:57:29AM +0300, Vitaly Ostrosablin wrote:
> This is test that triggers a bug with ghost files, that was resolved in
> patch "Don't fail if ghost file has no parent dirs".
>
> Signed-off-by: Vitaly Ostrosablin <vostrosablin at virtuozzo.com>
> ---
> test/zdtm/static/Makefile | 1 +
> test/zdtm/static/unlink_multiple_largefiles.c | 262 +++++++++++++++++++++++
> test/zdtm/static/unlink_multiple_largefiles.desc | 1 +
> 3 files changed, 264 insertions(+)
> create mode 100644 test/zdtm/static/unlink_multiple_largefiles.c
> create mode 100644 test/zdtm/static/unlink_multiple_largefiles.desc
>
> diff --git a/test/zdtm/static/Makefile b/test/zdtm/static/Makefile
> index 0e1db5c5..8c4e5e7a 100644
> --- a/test/zdtm/static/Makefile
> +++ b/test/zdtm/static/Makefile
> @@ -192,6 +192,7 @@ TST_NOFILE := \
> s390x_mmap_high \
> uffd-events \
> thread_different_uid_gid \
> + unlink_multiple_largefiles \
> # jobctl00 \
>
> include ../Makefile.inc
> diff --git a/test/zdtm/static/unlink_multiple_largefiles.c b/test/zdtm/static/unlink_multiple_largefiles.c
> new file mode 100644
> index 00000000..0db50b0b
> --- /dev/null
> +++ b/test/zdtm/static/unlink_multiple_largefiles.c
> @@ -0,0 +1,262 @@
> +#include <unistd.h>
> +#include <errno.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <fcntl.h>
> +#include <signal.h>
> +#include <limits.h>
> +
> +#include <sys/ioctl.h>
> +#include <linux/fs.h>
> +#include <linux/fiemap.h>
> +#include "zdtmtst.h"
> +
> +
> +#define FSIZE 0x3B600000ULL
> +#define NFILES 10
> +#define BUFSIZE (1<<20)
> +
> +const char *test_doc = "C/R of ten big (951MiB) unlinked files in root dir";
> +const char *test_author = "Vitaly Ostrosablin <vostrosablin at virtuozzo.com>";
> +
> +void create_check_pattern(char *buf, size_t count, unsigned char seed)
> +{
> + int i;
> +
> + for (i = 0; i < count; i++)
> + buf[i] = seed++;
> +}
> +
> +struct fiemap *read_fiemap(int fd)
> +{
> + test_msg("Obtaining fiemap for fd %d\n", fd);
> + struct fiemap *fiemap;
> + int extents_size;
> +
> + if ((fiemap = (struct fiemap*)malloc(sizeof(struct fiemap))) == NULL) {
> + pr_perror("Cannot allocate fiemap\n");
> + return NULL;
> + }
> + memset(fiemap, 0, sizeof(struct fiemap));
> +
> + fiemap->fm_length = FIEMAP_MAX_OFFSET;
> + fiemap->fm_start = 0;
> + fiemap->fm_flags = 0;
> + fiemap->fm_extent_count = 0;
> +
> + if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0) {
> + pr_perror("FIEMAP ioctl failed\n");
> + return NULL;
> + }
> +
> + extents_size = sizeof(struct fiemap_extent) *
> + (fiemap->fm_mapped_extents);
> +
> + if ((fiemap = (struct fiemap*)realloc(fiemap,sizeof(struct fiemap) +
> + extents_size)) == NULL) {
> + pr_perror("Cannot resize fiemap\n");
> + return NULL;
> + }
> + memset(fiemap->fm_extents, 0, extents_size);
> +
> + fiemap->fm_extent_count = fiemap->fm_mapped_extents;
> + fiemap->fm_mapped_extents = 0;
> +
> + if (ioctl(fd, FS_IOC_FIEMAP, fiemap) < 0) {
> + fprintf(stderr, "fiemap ioctl() failed\n");
> + return NULL;
> + }
> + test_msg("Debugkillme: %x\n", fiemap->fm_mapped_extents);
> +
> + return fiemap;
> +}
> +
> +void check_extent_map(struct fiemap *map)
> +{
> + int i;
> + unsigned long long datasize = 0;
> + unsigned long long holesize = 0;
> +
> + test_msg("Verifying extent map...\n");
> +
> + for (i = 0; i < map->fm_mapped_extents; i++) {
> + test_msg("Extent %d, start %llx, length %llx\n",
> + i,
> + map->fm_extents[i].fe_logical,
> + map->fm_extents[i].fe_length);
> +
> + if (i == 0)
> + holesize = map->fm_extents[i].fe_logical;
> + datasize += map->fm_extents[i].fe_length;
> + }
> + if (holesize != FSIZE) {
> + pr_perror("Unexpected hole size %llx != %llx\n", holesize,
> + (unsigned long long) FSIZE);
> + exit(1);
> + }
> + if (datasize != BUFSIZE) {
> + pr_perror("Unexpected data size %llx != %llx\n", datasize,
> + (unsigned long long) BUFSIZE);
> + exit(1);
> + }
> +}
> +
> +void compare_file_content(int fildes, int seed)
> +{
> + char ebuf[BUFSIZE];
> + char rbuf[BUFSIZE];
> + char linkpath[NAME_MAX];
> + int fd;
> + struct fiemap *fiemap;
> +
> + sprintf(linkpath, "/proc/%d/fd/%d", getpid(), fildes);
> +
> + fd = open(linkpath, O_RDONLY | O_LARGEFILE);
> + if (fd < 0) {
> + pr_perror("Cannot open unlinked file %s\n", linkpath);
> + exit(1);
> + }
> +
> + memset(ebuf, 0, BUFSIZE);
> +
> + fiemap = read_fiemap(fd);
> + check_extent_map(fiemap);
> + free(fiemap);
> +
> + lseek64(fd, FSIZE, SEEK_SET);
> +
> + create_check_pattern(ebuf, BUFSIZE, seed);
> +
> + if (read(fd, rbuf, BUFSIZE) != BUFSIZE) {
> + pr_perror("Cannot read %i bytes from file\n", BUFSIZE);
> + goto failed;
> + }
> +
> + if (memcmp(&ebuf, &rbuf, BUFSIZE)) {
> + pr_perror("Control Block: Data mismatch detected\n");
> + goto failed;
> + }
> +
> + close(fd);
> + return;
> +failed:
> + close(fd);
> + exit(1);
> +}
> +
> +void read_proc_fd_link(int fd, char *buf)
> +{
> + ssize_t res;
> + char linkpath[NAME_MAX];
> +
> + sprintf(linkpath, "/proc/%d/fd/%d", getpid(), fd);
> +
> + res = readlink(linkpath, buf, NAME_MAX);
> + if (res < 0) {
> + pr_perror("Cannot read fd symlink %s\n", linkpath);
> + exit(1);
> + }
> +}
> +
> +int create_unlinked_file(int fileno)
> +{
> + int fd;
> + char buf[1 << 20];
> + char fnm[NAME_MAX];
> +
> + sprintf(fnm, "/unlinked%d", fileno);
> + fd = open(fnm, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
> + if (fd < 0) {
> + pr_perror("Cannot create file %s\n", fnm);
> + exit(1);
> + }
> + test_msg("Created file: %s, fd %d\n", fnm, fd);
> +
> + if (lseek64(fd, FSIZE, SEEK_SET) < 0) {
> + pr_perror("Cannot seek to offset %llx\n", FSIZE);
> + goto failed;
> + }
> + test_msg("File positioning done, offset=%llx\n", FSIZE);
> +
> + create_check_pattern(&buf[0], BUFSIZE, fileno);
> + if (write(fd, buf, BUFSIZE) != BUFSIZE) {
> + pr_perror("Cannot write %i bytes to file\n", BUFSIZE);
> + goto failed;
> + }
> + test_msg("%i bytes written to file\n", BUFSIZE);
> +
> + if (unlink(fnm) < 0) {
> + pr_perror("Cannot unlink file %s\n", fnm);
> + goto failed;
> + }
> + test_msg("File %s is unlinked\n", fnm);
> +
> + return fd;
> +failed:
> + unlink(fnm);
> + close(fd);
> + return -1;
> +}
> +
> +int main(int argc, char **argv)
> +{
> + int fd[NFILES] = {0};
> + char links[NFILES][NAME_MAX];
> + char link[NAME_MAX];
> + int count = 0;
> + int tempfd;
> +
> + test_init(argc, argv);
> +
> + /* We need to create 10 unlinked files, each is around 1GB in size */
> + for (count = 0; count < NFILES; count++) {
> +
> + test_msg("Creating unlinked file %d/%d\n", count + 1, NFILES);
> + tempfd = create_unlinked_file(count);
> +
> + if (tempfd < 0) {
> + pr_perror("Cannot create unlinked file %d/%d\n",
> + count + 1, NFILES);
> + return 1;
> + }
> +
> + memset(&links[count][0], 0, NAME_MAX);
> + read_proc_fd_link(tempfd, &links[count][0]);
> +
> + fd[count] = tempfd;
> + }
> + test_msg("Created %d unlinked files\n", NFILES);
> +
> + test_daemon();
> + test_msg("Test daemonized, PID %d\n", getpid());
> + test_waitsig();
> +
> + test_msg("PID %d resumed, doing final checks...\n", getpid());
> +
> + for (count = 0; count < NFILES; count++) {
> + test_msg("Processing fd #%d (%d)\n", count, fd[count]);
> +
> + test_msg("Checking symlink consistency...\n");
> + memset(&link[0], 0, NAME_MAX);
> + read_proc_fd_link(fd[count], &link[0]);
> +
> + if (strcmp(&links[count][0], &link[0])) {
> + pr_perror("Symlink target %s has changed to %s\n",
> + links[count], link);
> + return 1;
> + }
> +
> + test_msg("Checking file contents...\n");
> + compare_file_content(fd[count], count);
> +
> + test_msg("Closing file descriptor...\n");
> + if (close(fd[count]) == -1) {
> + pr_perror("Close failed, errno %d\n", errno);
> + return 1;
> + }
> + }
> +
> + pass();
> + return 0;
> +}
> diff --git a/test/zdtm/static/unlink_multiple_largefiles.desc b/test/zdtm/static/unlink_multiple_largefiles.desc
> new file mode 100644
> index 00000000..b4ab1a82
> --- /dev/null
> +++ b/test/zdtm/static/unlink_multiple_largefiles.desc
> @@ -0,0 +1 @@
> +{'flavor': 'ns uns', 'opts': '--ghost-limit 1G'}
> --
> 2.16.2
>
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