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Checksum test

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This commit is contained in:
Kent Overstreet 2010-05-14 08:54:26 -08:00
parent 5936daea26
commit 11a1a3ca52
2 changed files with 70 additions and 29 deletions
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91
bcache-test.c
View File

@ -15,6 +15,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdint.h>
#define Pread(fd, buf, size, offset) do { \
int _read = 0, _r; \
@ -51,15 +52,35 @@ double normal()
return x * s;
}
uint32_t fletcher32(uint16_t *data, size_t len)
{
uint32_t sum1 = 0xffff, sum2 = 0xffff;
while (len) {
unsigned tlen = len > 360 ? 360 : len;
len -= tlen;
do {
sum1 += *data++;
sum2 += sum1;
} while (--tlen);
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
}
/* Second reduction step to reduce sums to 16 bits */
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
return sum2 << 16 | sum1;
}
long getblocks(int fd)
{
long ret;
struct stat statbuf;
if (fstat(fd, &statbuf)) {
perror("stat error\n");
perror("stat error");
exit(EXIT_FAILURE);
}
ret = statbuf.st_blocks;
ret = statbuf.st_size / 512;
if (S_ISBLK(statbuf.st_mode))
if (ioctl(fd, BLKGETSIZE, &ret)) {
perror("ioctl error");
@ -70,17 +91,18 @@ long getblocks(int fd)
int main(int argc, char **argv)
{
bool walk = false, randsize = false, verbose = false;
int fd1, fd2, direct = 0, nbytes = 4096, j;
unsigned long size, i = 0, offset = 0;
bool walk = false, randsize = false, verbose = false, csum = false;
int fd1, fd2 = 0, direct = 0, nbytes = 4096, j;
unsigned long size, i, offset = 0;
void *buf1 = NULL, *buf2 = NULL;
uint32_t *csums = NULL;
if (argc < 3) {
printf("Please enter a cache device and raw device\n");
exit(EXIT_FAILURE);
}
for (i = 3; i < argc; i++) {
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "direct") == 0)
direct = O_DIRECT;
else if (strcmp(argv[i], "walk") == 0)
@ -89,20 +111,27 @@ int main(int argc, char **argv)
verbose = true;
else if (strcmp(argv[i], "size") == 0)
randsize = true;
else {
printf("Uknown argument %s\n", argv[i]);
exit(EXIT_FAILURE);
}
else if (strcmp(argv[i], "csum") == 0)
csum= true;
else
break;
}
fd1 = open(argv[1], O_RDONLY|direct);
fd2 = open(argv[2], O_RDONLY|direct);
fd1 = open(argv[i], O_RDONLY|direct);
size = getblocks(fd1);
if (!csum) {
fd2 = open(argv[2], O_RDONLY|direct);
size = MIN(size, getblocks(fd2));
} else
csums = calloc((size / 8 + 1), sizeof(*csums));
if (fd1 == -1 || fd2 == -1) {
perror("Error opening device");
exit(EXIT_FAILURE);
}
size = MIN(getblocks(fd1), getblocks(fd2)) / 8 - 16;
size = size / 8 - 16;
printf("size %li\n", size);
if (posix_memalign(&buf1, 4096, 4096 * 16) ||
@ -110,34 +139,46 @@ int main(int argc, char **argv)
printf("Could not allocate buffers\n");
exit(EXIT_FAILURE);
}
setvbuf(stdout, NULL, _IONBF, 0);
while (1) {
for (i = 0;; i++) {
if (randsize)
nbytes = 4096 * (int) (drand48() * 16 + 1);
offset += walk ? normal() * 60 : random();
offset += walk ? normal() * 100 : random();
offset %= size;
assert(offset < size);
do {
if (verbose)
printf("Loop %li offset %li sectors %i\n",
i, offset << 3, nbytes >> 9);
else if (!(i % 100))
printf("Loop %li\n", i);
if (verbose)
printf("Loop %li offset %li sectors %i\n",
i, offset << 3, nbytes >> 9);
else if (!(i % 100))
printf("Loop %li\n", i);
Pread(fd1, buf1, nbytes, offset << 12);
Pread(fd1, buf1, nbytes, offset << 12);
if (!csum) {
Pread(fd2, buf2, nbytes, offset << 12);
for (j = 0; j < nbytes; j += 512)
if (memcmp(buf1 + j,
buf2 + j,
512)) {
printf("Bad read! offset %li sectors %i, sector %i\n",
offset << 3, nbytes >> 9, j >> 9);
printf("Bad read! loop %li offset %li sectors %i, sector %i\n",
i, offset << 3, nbytes >> 9, j >> 9);
exit(EXIT_FAILURE);
}
} while (!(i++ & 1));
} else
for (j = 0; j < nbytes / 4096; j++) {
int c = fletcher32(buf1 + j * 4096, 4096);
if (!csums[offset + j])
csums[offset + j] = c;
else if (csums[offset + j] != c) {
printf("Bad read! loop %li offset %li sectors %i, sector %i\n",
i, offset << 3, nbytes >> 9, j << 3);
exit(EXIT_FAILURE);
}
}
}
err:
perror("Read error");

8
make-bcache.c
View File

@ -45,7 +45,7 @@ long getblocks(int fd)
perror("stat error\n");
exit(EXIT_FAILURE);
}
ret = statbuf.st_blocks;
ret = statbuf.st_size / 512;
if (S_ISBLK(statbuf.st_mode))
if (ioctl(fd, BLKGETSIZE, &ret)) {
perror("ioctl error");
@ -77,7 +77,7 @@ long hatoi(const char *s)
int main(int argc, char **argv)
{
int64_t nblocks, bucketsize = 1024, blocksize = 8;
int64_t nblocks, bucketsize = 32, blocksize = 8;
int fd, i, c;
struct cache_sb sb;
@ -100,6 +100,7 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
nblocks = getblocks(fd);
printf("device is %li sectors\n", nblocks);
if (bucketsize < blocksize ||
bucketsize > nblocks / 8) {
@ -114,8 +115,7 @@ int main(int argc, char **argv)
sb.nbuckets = nblocks / sb.bucket_size;
do
sb.first_bucket = ((--sb.nbuckets * sizeof(struct bucket_disk))
+ 4096 * 3) / (sb.bucket_size * 512) + 1;
sb.first_bucket = ((--sb.nbuckets * sizeof(struct bucket_disk)) + (24 << 9)) / (sb.bucket_size << 9) + 1;
while ((sb.nbuckets + sb.first_bucket) * sb.bucket_size > nblocks);
sb.journal_start = sb.first_bucket;