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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <errno.h>
#include "bit-rot-object-version.h"
/* NOTE: no size discovery */
int
brstub_validate_version (char *bpath, unsigned long version)
{
int ret = 0;
int match = 0;
size_t xsize = 0;
br_version_t *xv = NULL;
xsize = sizeof (br_version_t);
xv = calloc (1, xsize);
if (!xv) {
match = -1;
goto err;
}
ret = getxattr (bpath, "trusted.bit-rot.version", xv, xsize);
if (ret < 0) {
if (errno == ENODATA)
match = -2;
goto err;
}
if (xv->ongoingversion != version) {
match = -3;
fprintf (stderr, "ongoingversion: %lu\n", xv->ongoingversion);
}
free (xv);
err:
return match;
}
int
brstub_write_validation (char *filp, char *bpath, unsigned long startversion)
{
int fd1 = 0;
int fd2 = 0;
int ret = 0;
char *string = "string\n";
/* read only check */
fd1 = open (filp, O_RDONLY);
if (fd1 < 0)
goto err;
close (fd1);
ret = brstub_validate_version (bpath, startversion);
if (ret != -2)
goto err;
/* single open (write/) check */
fd1 = open (filp, O_RDWR);
if (fd1 < 0)
goto err;
ret = write (fd1, string, strlen (string));
if (ret <= 0)
goto err;
/**
* Fsync is done so that the write call has properly reached the
* disk. For fuse mounts write-behind xlator would have held the
* writes with itself and for nfs, client would have held the
* write in its cache. So write fop would not have triggered the
* versioning as it would have not reached the bit-rot-stub.
*/
fsync (fd1);
ret = brstub_validate_version (bpath, startversion);
if (ret != 0)
goto err;
ret = write (fd1, string, strlen (string));
if (ret <= 0)
goto err;
fsync (fd1); /* let it reach the disk */
ret = brstub_validate_version (bpath, startversion);
if (ret != 0)
goto err;
close (fd1);
/**
* Well, this is not a _real_ test per se . For this test to pass
* the inode should not get a forget() in the interim. Therefore,
* perform this test asap.
*/
/* multi open (write/) check */
fd1 = open (filp, O_RDWR);
if (fd1 < 0)
goto err;
fd2 = open (filp, O_WRONLY);
if (fd1 < 0)
goto err;
ret = write (fd1, string, strlen (string));
if (ret <= 0)
goto err;
ret = write (fd2, string, strlen (string));
if (ret <= 0)
goto err;
/* probably do a syncfs() */
fsync (fd1);
fsync (fd2);
close (fd1);
close (fd2);
/**
* incremented once per write()/write().../close()/close() sequence
*/
ret = brstub_validate_version (bpath, startversion);
if (ret != 0)
goto err;
return 0;
err:
return -1;
}
int
brstub_new_object_validate (char *filp, char *brick)
{
int ret = 0;
char *fname = NULL;
char bpath[PATH_MAX] = {0,};
fname = basename (filp);
if (!fname)
goto err;
(void) snprintf (bpath, PATH_MAX, "%s/%s", brick, fname);
printf ("Validating initial version..\n");
ret = brstub_validate_version (bpath, 2);
if (ret != -2) /* version _should_ be missing */
goto err;
printf ("Validating version on modifications..\n");
ret = brstub_write_validation (filp, bpath, 2);
if (ret < 0)
goto err;
return 0;
err:
return -1;
}
int
main (int argc, char **argv)
{
int ret = 0;
char *filp = NULL;
char *brick = NULL;
if (argc != 3) {
printf ("Usage: %s <path> <brick>\n", argv[0]);
goto err;
}
filp = argv[1];
brick = argv[2];
printf ("Validating object version [%s]\n", filp);
ret = brstub_new_object_validate (filp, brick);
if (ret < 0)
goto err;
return 0;
err:
return -1;
}
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