[CRIU] [PATCH v8] zdtm: Add a test to check if we can C/R ghost files with no parent dirs.
Vitaly Ostrosablin
vostrosablin at virtuozzo.com
Mon Apr 2 10:57:29 MSK 2018
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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