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/*
* IO verification helpers
*/
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include "fio.h"
static void fill_random_bytes(struct thread_data *td,
unsigned char *p, unsigned int len)
{
unsigned int todo;
double r;
while (len) {
r = os_random_double(&td->verify_state);
/*
* lrand48_r seems to be broken and only fill the bottom
* 32-bits, even on 64-bit archs with 64-bit longs
*/
todo = sizeof(r);
if (todo > len)
todo = len;
memcpy(p, &r, todo);
len -= todo;
p += todo;
}
}
static void hexdump(void *buffer, int len)
{
unsigned char *p = buffer;
int i;
for (i = 0; i < len; i++)
log_info("%02x", p[i]);
log_info("\n");
}
static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u)
{
unsigned char *p = (unsigned char *) io_u->buf;
unsigned long c;
p += sizeof(*hdr);
c = crc32(p, hdr->len - sizeof(*hdr));
if (c != hdr->crc32) {
log_err("crc32: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen);
log_err("crc32: wanted %lx, got %lx\n", hdr->crc32, c);
return 1;
}
return 0;
}
static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u)
{
unsigned char *p = (unsigned char *) io_u->buf;
struct md5_ctx md5_ctx;
memset(&md5_ctx, 0, sizeof(md5_ctx));
p += sizeof(*hdr);
md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr));
if (memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash))) {
log_err("md5: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen);
hexdump(hdr->md5_digest, sizeof(hdr->md5_digest));
hexdump(md5_ctx.hash, sizeof(md5_ctx.hash));
return 1;
}
return 0;
}
int verify_io_u(struct thread_data *td, struct io_u *io_u)
{
struct verify_header *hdr = (struct verify_header *) io_u->buf;
int ret;
if (td->o.verify == VERIFY_NULL)
return 0;
if (hdr->fio_magic != FIO_HDR_MAGIC) {
log_err("Bad verify header %x\n", hdr->fio_magic);
return EIO;
}
if (hdr->verify_type == VERIFY_MD5)
ret = verify_io_u_md5(hdr, io_u);
else if (hdr->verify_type == VERIFY_CRC32)
ret = verify_io_u_crc32(hdr, io_u);
else {
log_err("Bad verify type %u\n", hdr->verify_type);
ret = 1;
}
if (ret)
return EIO;
return 0;
}
static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
{
hdr->crc32 = crc32(p, len);
}
static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
{
struct md5_ctx md5_ctx;
memset(&md5_ctx, 0, sizeof(md5_ctx));
md5_update(&md5_ctx, p, len);
memcpy(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash));
}
/*
* fill body of io_u->buf with random data and add a header with the
* crc32 or md5 sum of that data.
*/
void populate_verify_io_u(struct thread_data *td, struct io_u *io_u)
{
unsigned char *p = (unsigned char *) io_u->buf;
struct verify_header hdr;
if (td->o.verify == VERIFY_NULL)
return;
hdr.fio_magic = FIO_HDR_MAGIC;
hdr.len = io_u->buflen;
p += sizeof(hdr);
fill_random_bytes(td, p, io_u->buflen - sizeof(hdr));
if (td->o.verify == VERIFY_MD5) {
fill_md5(&hdr, p, io_u->buflen - sizeof(hdr));
hdr.verify_type = VERIFY_MD5;
} else if (td->o.verify == VERIFY_CRC32) {
fill_crc32(&hdr, p, io_u->buflen - sizeof(hdr));
hdr.verify_type = VERIFY_CRC32;
}
memcpy(io_u->buf, &hdr, sizeof(hdr));
}
int get_next_verify(struct thread_data *td, struct io_u *io_u)
{
struct io_piece *ipo = NULL;
/*
* this io_u is from a requeue, we already filled the offsets
*/
if (io_u->file)
return 0;
if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
struct rb_node *n = rb_first(&td->io_hist_tree);
ipo = rb_entry(n, struct io_piece, rb_node);
rb_erase(n, &td->io_hist_tree);
} else if (!list_empty(&td->io_hist_list)) {
ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
list_del(&ipo->list);
}
if (ipo) {
io_u->offset = ipo->offset;
io_u->buflen = ipo->len;
io_u->file = ipo->file;
io_u->ddir = DDIR_READ;
io_u->xfer_buf = io_u->buf;
io_u->xfer_buflen = io_u->buflen;
free(ipo);
return 0;
}
return 1;
}
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