summaryrefslogtreecommitdiff
path: root/bcache-test.c
diff options
context:
space:
mode:
Diffstat (limited to 'bcache-test.c')
-rw-r--r--bcache-test.c320
1 files changed, 0 insertions, 320 deletions
diff --git a/bcache-test.c b/bcache-test.c
deleted file mode 100644
index ccc25bb..0000000
--- a/bcache-test.c
+++ /dev/null
@@ -1,320 +0,0 @@
-/*
- * Author: Kent Overstreet <kent.overstreet@gmail.com>
- *
- * GPLv2
- */
-
-#define _FILE_OFFSET_BITS 64
-#define _XOPEN_SOURCE 500
-#define _GNU_SOURCE
-
-#include <fcntl.h>
-#include <limits.h>
-#include <linux/fs.h>
-#include <math.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-#include <sys/klog.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <time.h>
-
-#include <openssl/rc4.h>
-#include <openssl/md4.h>
-
-static const unsigned char bcache_magic[] = {
- 0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
- 0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 };
-
-unsigned char zero[4096];
-
-bool klog = false;
-
-#define Pread(fd, buf, size, offset) do { \
- int _read = 0, _r; \
- while (_read < size) { \
- _r = pread(fd, buf, (size) - _read, (offset) + _read); \
- if (_r <= 0) \
- goto err; \
- _read += _r; \
- } \
-} while (0)
-
-#define Pwrite(fd, buf, size, offset) do { \
- int _write = 0, _r; \
- while (_write < size) { \
- _r = pwrite(fd, buf, (size) - _write, offset + _write); \
- if (_r < 0) \
- goto err; \
- _write += _r; \
- } \
-} while (0)
-
-/* Marsaglia polar method
- */
-double normal()
-{
- double x, y, s;
- static double n = 0 / (double) 0;
-
- if (n == n) {
- x = n;
- n = 0 / (double) 0;
- return x;
- }
-
- do {
- x = random() / (double) (RAND_MAX / 2) - 1;
- y = random() / (double) (RAND_MAX / 2) - 1;
-
- s = x * x + y * y;
- } while (s >= 1);
-
- s = sqrt(-2 * log(s) / s);
- n = y * s;
- return x * s;
-}
-
-long getblocks(int fd)
-{
- long ret;
- struct stat statbuf;
- if (fstat(fd, &statbuf)) {
- perror("stat error");
- exit(EXIT_FAILURE);
- }
- ret = statbuf.st_size / 512;
- if (S_ISBLK(statbuf.st_mode))
- if (ioctl(fd, BLKGETSIZE, &ret)) {
- perror("ioctl error");
- exit(EXIT_FAILURE);
- }
- return ret;
-}
-
-struct pagestuff {
- unsigned char csum[16];
- unsigned char oldcsum[16];
- int readcount;
- int writecount;
-};
-
-void flushlog(void)
-{
- char logbuf[1 << 21];
- int w = 0, len;
- static int fd;
-
- if (!klog)
- return;
-
- if (!fd) {
- klogctl(8, 0, 6);
-
- sprintf(logbuf, "log.%i", abs(random()) % 1000);
- fd = open(logbuf, O_WRONLY|O_CREAT|O_TRUNC, 0644);
-
- if (fd == -1) {
- perror("Error opening log file");
- exit(EXIT_FAILURE);
- }
- }
-
- len = klogctl(4, logbuf, 1 << 21);
-
- if (len == -1) {
- perror("Error reading kernel log");
- exit(EXIT_FAILURE);
- }
-
- while (w < len) {
- int r = write(fd, logbuf + w, len - w);
- if (r == -1) {
- perror("Error writing log");
- exit(EXIT_FAILURE);
- }
- w += r;
- }
-}
-
-void aio_loop(int nr)
-{
-
-}
-
-void usage()
-{
- exit(EXIT_FAILURE);
-}
-
-int main(int argc, char **argv)
-{
- bool walk = false, randsize = false, verbose = false, csum = false, rtest = false, wtest = false;
- int fd1, fd2 = 0, direct = 0, nbytes = 4096, j, o;
- unsigned long size, i, offset = 0, done = 0, unique = 0, benchmark = 0;
- void *buf1 = NULL, *buf2 = NULL;
- struct pagestuff *pages, *p;
- unsigned char c[16];
- time_t last_printed = 0;
- extern char *optarg;
-
- RC4_KEY writedata;
- RC4_set_key(&writedata, 16, bcache_magic);
-
- while ((o = getopt(argc, argv, "dnwvscwlb:")) != EOF)
- switch (o) {
- case 'd':
- direct = O_DIRECT;
- break;
- case 'n':
- walk = true;
- break;
- case 'v':
- verbose = true;
- break;
- case 's':
- randsize = true;
- break;
- case 'c':
- csum = true;
- break;
- case 'w':
- wtest = true;
- break;
- case 'r':
- rtest = true;
- break;
- case 'l':
- klog = true;
- break;
- case 'b':
- benchmark = atol(optarg);
- break;
- default:
- usage();
- }
-
- argv += optind;
- argc -= optind;
-
- if (!rtest && !wtest)
- rtest = true;
-
- if (argc < 1) {
- printf("Please enter a device to test\n");
- exit(EXIT_FAILURE);
- }
-
- if (!csum && !benchmark && argc < 2) {
- printf("Please enter a device to compare against\n");
- exit(EXIT_FAILURE);
- }
-
- fd1 = open(argv[0], (wtest ? O_RDWR : O_RDONLY)|direct);
- if (!csum && !benchmark)
- fd2 = open(argv[1], (wtest ? O_RDWR : O_RDONLY)|direct);
-
- if (fd1 == -1 || fd2 == -1) {
- perror("Error opening device");
- exit(EXIT_FAILURE);
- }
-
- size = getblocks(fd1);
- if (!csum && !benchmark)
- size = MIN(size, getblocks(fd2));
-
- size = size / 8 - 16;
- pages = calloc(size + 16, sizeof(*pages));
- printf("size %li\n", size);
-
- if (posix_memalign(&buf1, 4096, 4096 * 16) ||
- posix_memalign(&buf2, 4096, 4096 * 16)) {
- printf("Could not allocate buffers\n");
- exit(EXIT_FAILURE);
- }
- //setvbuf(stdout, NULL, _IONBF, 0);
-
- for (i = 0; !benchmark || i < benchmark; i++) {
- bool writing = (wtest && (i & 1)) || !rtest;
- nbytes = randsize ? drand48() * 16 + 1 : 1;
- nbytes <<= 12;
-
- offset >>= 12;
- offset += walk ? normal() * 20 : random();
- offset %= size;
- offset <<= 12;
-
- if (!(i % 200))
- flushlog();
-
- if (!verbose) {
- time_t now = time(NULL);
- if (now - last_printed >= 2) {
- last_printed = now;
- goto print;
- }
- } else
-print: printf("Loop %6li offset %9li sectors %3i, %6lu mb done, %6lu mb unique\n",
- i, offset >> 9, nbytes >> 9, done >> 11, unique >> 11);
-
- done += nbytes >> 9;
-
- if (!writing)
- Pread(fd1, buf1, nbytes, offset);
- if (!writing && !csum && !benchmark)
- Pread(fd2, buf2, nbytes, offset);
-
- for (j = 0; j < nbytes; j += 4096) {
- p = &pages[(offset + j) / 4096];
-
- if (writing)
- RC4(&writedata, 4096, zero, buf1 + j);
-
- if (csum) {
- MD4(buf1 + j, 4096, &c[0]);
-
- if (writing ||
- (!p->readcount && !p->writecount)) {
- memcpy(&p->oldcsum[0], &p->csum[0], 16);
- memcpy(&p->csum[0], c, 16);
- } else if (memcmp(&p->csum[0], c, 16))
- goto bad;
- } else if (!writing && !benchmark &&
- memcmp(buf1 + j,
- buf2 + j,
- 4096))
- goto bad;
-
- if (!p->writecount && !p->readcount)
- unique += 8;
-
- writing ? p->writecount++ : p->readcount++;
- }
- if (writing)
- Pwrite(fd1, buf1, nbytes, offset);
- if (writing && !csum && !benchmark)
- Pwrite(fd2, buf2, nbytes, offset);
- }
- printf("Loop %6li offset %9li sectors %3i, %6lu mb done, %6lu mb unique\n",
- i, offset >> 9, nbytes >> 9, done >> 11, unique >> 11);
- exit(EXIT_SUCCESS);
-err:
- perror("IO error");
- flushlog();
- exit(EXIT_FAILURE);
-bad:
- printf("Bad read! loop %li offset %li readcount %i writecount %i\n",
- i, (offset + j) >> 9, p->readcount, p->writecount);
-
- if (!memcmp(&p->oldcsum[0], c, 16))
- printf("Matches previous csum\n");
-
- flushlog();
- exit(EXIT_FAILURE);
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-07-02 22:26:13 +0000