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Diffstat (limited to 'bcache-test.c')
-rw-r--r--bcache-test.c91
1 files changed, 66 insertions, 25 deletions
diff --git a/bcache-test.c b/bcache-test.c
index 69a3c48..49bb723 100644
--- a/bcache-test.c
+++ b/bcache-test.c
@@ -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);
+ }
+ } 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);
}
- } while (!(i++ & 1));
+ }
}
err:
perror("Read error");