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verify.c

/*
 * IO verification helpers
 */
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>
#include <pthread.h>

#include "fio.h"
#include "verify.h"
#include "smalloc.h"

#include "crc/md5.h"
#include "crc/crc64.h"
#include "crc/crc32.h"
#include "crc/crc32c.h"
#include "crc/crc16.h"
#include "crc/crc7.h"
#include "crc/sha256.h"
#include "crc/sha512.h"

static void fill_random_bytes(struct thread_data *td, void *p, unsigned int len)
{
      unsigned int todo;
      int r;

      while (len) {
            r = os_random_long(&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 fill_pattern(struct thread_data *td, void *p, unsigned int len)
{
      switch (td->o.verify_pattern_bytes) {
      case 0:
            dprint(FD_VERIFY, "fill random bytes len=%u\n", len);
            fill_random_bytes(td, p, len);
            break;
      case 1:
            dprint(FD_VERIFY, "fill verify pattern b=0 len=%u\n", len);
            memset(p, td->o.verify_pattern, len);
            break;
      case 2:
      case 3:
      case 4: {
            unsigned int pattern = td->o.verify_pattern;
            unsigned int i = 0;
            unsigned char c1, c2, c3, c4;
            unsigned char *b = p;

            dprint(FD_VERIFY, "fill verify pattern b=%d len=%u\n",
                              td->o.verify_pattern_bytes, len);

            c1 = pattern & 0xff;
            pattern >>= 8;
            c2 = pattern & 0xff;
            pattern >>= 8;
            c3 = pattern & 0xff;
            pattern >>= 8;
            c4 = pattern & 0xff;

            while (i < len) {
                  b[i++] = c1;
                  if (i == len)
                        break;
                  b[i++] = c2;
                  if (td->o.verify_pattern_bytes == 2 || i == len)
                        continue;
                  b[i++] = c3;
                  if (td->o.verify_pattern_bytes == 3 || i == len)
                        continue;
                  b[i++] = c4;
            }
            break;
            }
      }
}

static void memswp(void *buf1, void *buf2, unsigned int len)
{
      char swap[200];

      assert(len <= sizeof(swap));

      memcpy(&swap, buf1, len);
      memcpy(buf1, buf2, len);
      memcpy(buf2, &swap, len);
}

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");
}

/*
 * Prepare for seperation of verify_header and checksum header
 */
static inline unsigned int __hdr_size(int verify_type)
{
      unsigned int len = len;

      switch (verify_type) {
      case VERIFY_NONE:
      case VERIFY_NULL:
            len = 0;
            break;
      case VERIFY_MD5:
            len = sizeof(struct vhdr_md5);
            break;
      case VERIFY_CRC64:
            len = sizeof(struct vhdr_crc64);
            break;
      case VERIFY_CRC32C:
      case VERIFY_CRC32:
      case VERIFY_CRC32C_INTEL:
            len = sizeof(struct vhdr_crc32);
            break;
      case VERIFY_CRC16:
            len = sizeof(struct vhdr_crc16);
            break;
      case VERIFY_CRC7:
            len = sizeof(struct vhdr_crc7);
            break;
      case VERIFY_SHA256:
            len = sizeof(struct vhdr_sha256);
            break;
      case VERIFY_SHA512:
            len = sizeof(struct vhdr_sha512);
            break;
      case VERIFY_META:
            len = sizeof(struct vhdr_meta);
            break;
      default:
            log_err("fio: unknown verify header!\n");
            assert(0);
      }

      return len + sizeof(struct verify_header);
}

static inline unsigned int hdr_size(struct verify_header *hdr)
{
      return __hdr_size(hdr->verify_type);
}

static void *hdr_priv(struct verify_header *hdr)
{
      void *priv = hdr;

      return priv + sizeof(struct verify_header);
}

/*
 * Return data area 'header_num'
 */
static inline void *io_u_verify_off(struct verify_header *hdr,
                            struct io_u *io_u, unsigned char header_num)
{
      return io_u->buf + header_num * hdr->len + hdr_size(hdr);
}

static int verify_io_u_meta(struct verify_header *hdr, struct thread_data *td,
                      struct io_u *io_u, unsigned int header_num)
{
      struct vhdr_meta *vh = hdr_priv(hdr);

      dprint(FD_VERIFY, "meta verify io_u %p, len %u\n", io_u, hdr->len);

      if (vh->offset != io_u->offset + header_num * td->o.verify_interval) {
            log_err("meta: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_sha512(struct verify_header *hdr, struct io_u *io_u,
                        unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_sha512 *vh = hdr_priv(hdr);
      uint8_t sha512[128];
      struct sha512_ctx sha512_ctx = {
            .buf = sha512,
      };

      dprint(FD_VERIFY, "sha512 verify io_u %p, len %u\n", io_u, hdr->len);

      sha512_init(&sha512_ctx);
      sha512_update(&sha512_ctx, p, hdr->len - hdr_size(hdr));

      if (memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512))) {
            log_err("sha512: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            hexdump(vh->sha512, sizeof(vh->sha512));
            hexdump(sha512_ctx.buf, sizeof(sha512));
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_sha256(struct verify_header *hdr, struct io_u *io_u,
                        unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_sha256 *vh = hdr_priv(hdr);
      uint8_t sha256[128];
      struct sha256_ctx sha256_ctx = {
            .buf = sha256,
      };

      dprint(FD_VERIFY, "sha256 verify io_u %p, len %u\n", io_u, hdr->len);

      sha256_init(&sha256_ctx);
      sha256_update(&sha256_ctx, p, hdr->len - hdr_size(hdr));

      if (memcmp(vh->sha256, sha256_ctx.buf, sizeof(sha256))) {
            log_err("sha256: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            hexdump(vh->sha256, sizeof(vh->sha256));
            hexdump(sha256_ctx.buf, sizeof(sha256));
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_crc7(struct verify_header *hdr, struct io_u *io_u,
                      unsigned char header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_crc7 *vh = hdr_priv(hdr);
      unsigned char c;

      dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", io_u, hdr->len);

      c = crc7(p, hdr->len - hdr_size(hdr));

      if (c != vh->crc7) {
            log_err("crc7: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            log_err("crc7: wanted %x, got %x\n", vh->crc7, c);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_crc16(struct verify_header *hdr, struct io_u *io_u,
                       unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_crc16 *vh = hdr_priv(hdr);
      unsigned short c;

      dprint(FD_VERIFY, "crc16 verify io_u %p, len %u\n", io_u, hdr->len);

      c = crc16(p, hdr->len - hdr_size(hdr));

      if (c != vh->crc16) {
            log_err("crc16: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            log_err("crc16: wanted %x, got %x\n", vh->crc16, c);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_crc64(struct verify_header *hdr, struct io_u *io_u,
                       unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_crc64 *vh = hdr_priv(hdr);
      unsigned long long c;

      dprint(FD_VERIFY, "crc64 verify io_u %p, len %u\n", io_u, hdr->len);

      c = crc64(p, hdr->len - hdr_size(hdr));

      if (c != vh->crc64) {
            log_err("crc64: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len,
                        hdr->len);
            log_err("crc64: wanted %llx, got %llx\n",
                              (unsigned long long) vh->crc64, c);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u,
                       unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_crc32 *vh = hdr_priv(hdr);
      uint32_t c;

      dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", io_u, hdr->len);

      c = crc32(p, hdr->len - hdr_size(hdr));

      if (c != vh->crc32) {
            log_err("crc32: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            log_err("crc32: wanted %x, got %x\n", vh->crc32, c);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_crc32c(struct verify_header *hdr, struct io_u *io_u,
                        unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_crc32 *vh = hdr_priv(hdr);
      uint32_t c;

      dprint(FD_VERIFY, "crc32c verify io_u %p, len %u\n", io_u, hdr->len);

      if (hdr->verify_type == VERIFY_CRC32C_INTEL)
            c = crc32c_intel(p, hdr->len - hdr_size(hdr));
      else
            c = crc32c(p, hdr->len - hdr_size(hdr));

      if (c != vh->crc32) {
            log_err("crc32c: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            log_err("crc32c: wanted %x, got %x\n", vh->crc32, c);
            return EILSEQ;
      }

      return 0;
}

static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u,
                     unsigned int header_num)
{
      void *p = io_u_verify_off(hdr, io_u, header_num);
      struct vhdr_md5 *vh = hdr_priv(hdr);
      uint32_t hash[MD5_HASH_WORDS];
      struct md5_ctx md5_ctx = {
            .hash = hash,
      };

      dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", io_u, hdr->len);

      md5_init(&md5_ctx);
      md5_update(&md5_ctx, p, hdr->len - hdr_size(hdr));

      if (memcmp(vh->md5_digest, md5_ctx.hash, sizeof(hash))) {
            log_err("md5: verify failed at %llu/%u\n",
                        io_u->offset + header_num * hdr->len, hdr->len);
            hexdump(vh->md5_digest, sizeof(vh->md5_digest));
            hexdump(md5_ctx.hash, sizeof(hash));
            return EILSEQ;
      }

      return 0;
}

static unsigned int hweight8(unsigned int w)
{
      unsigned int res = w - ((w >> 1) & 0x55);

      res = (res & 0x33) + ((res >> 2) & 0x33);
      return (res + (res >> 4)) & 0x0F;
}

int verify_io_u_pattern(unsigned long pattern, unsigned long pattern_size,
                  char *buf, unsigned int len, unsigned int mod)
{
      unsigned int i;
      char split_pattern[4];

      for (i = 0; i < 4; i++) {
            split_pattern[i] = pattern & 0xff;
            pattern >>= 8;
      }

      for (i = 0; i < len; i++) {
            if (buf[i] != split_pattern[mod]) {
                  unsigned int bits;

                  bits = hweight8(buf[i] ^ split_pattern[mod]);
                  log_err("fio: got pattern %x, wanted %x. Bad bits %d\n",
                        buf[i], split_pattern[mod], bits);
                  log_err("fio: bad pattern block offset %u\n", i);
                  return EILSEQ;
            }
            mod++;
            if (mod == pattern_size)
                  mod = 0;
      }

      return 0;
}

/*
 * Push IO verification to a separate thread
 */
int verify_io_u_async(struct thread_data *td, struct io_u *io_u)
{
      if (io_u->file)
            put_file_log(td, io_u->file);

      io_u->file = NULL;

      pthread_mutex_lock(&td->io_u_lock);
      flist_del(&io_u->list);
      flist_add_tail(&io_u->list, &td->verify_list);
      pthread_mutex_unlock(&td->io_u_lock);

      pthread_cond_signal(&td->verify_cond);
      io_u->flags |= IO_U_F_FREE_DEF;
      return 0;
}

int verify_io_u(struct thread_data *td, struct io_u *io_u)
{
      struct verify_header *hdr;
      unsigned int hdr_size, hdr_inc, hdr_num = 0;
      void *p;
      int ret;

      if (td->o.verify == VERIFY_NULL || io_u->ddir != DDIR_READ)
            return 0;

      hdr_inc = io_u->buflen;
      if (td->o.verify_interval)
            hdr_inc = td->o.verify_interval;

      ret = 0;
      for (p = io_u->buf; p < io_u->buf + io_u->buflen;
           p += hdr_inc, hdr_num++) {
            if (ret && td->o.verify_fatal) {
                  td->terminate = 1;
                  break;
            }
            hdr_size = __hdr_size(td->o.verify);
            if (td->o.verify_offset)
                  memswp(p, p + td->o.verify_offset, hdr_size);
            hdr = p;

            if (hdr->fio_magic != FIO_HDR_MAGIC) {
                  log_err("Bad verify header %x\n", hdr->fio_magic);
                  return EILSEQ;
            }

            if (td->o.verify_pattern_bytes) {
                  dprint(FD_VERIFY, "pattern verify io_u %p, len %u\n",
                                                io_u, hdr->len);
                  ret = verify_io_u_pattern(td->o.verify_pattern,
                                      td->o.verify_pattern_bytes,
                                      p + hdr_size,
                                      hdr_inc - hdr_size,
                                      hdr_size % 4);
                  /*
                   * Also verify the meta data, if applicable
                   */
                  if (hdr->verify_type == VERIFY_META)
                        ret |= verify_io_u_meta(hdr, td, io_u, hdr_num);

                  if (ret)
                        log_err("fio: verify failed at %llu/%u\n",
                              io_u->offset + hdr_num * hdr->len,
                              hdr->len);
                  continue;
            }

            switch (hdr->verify_type) {
            case VERIFY_MD5:
                  ret = verify_io_u_md5(hdr, io_u, hdr_num);
                  break;
            case VERIFY_CRC64:
                  ret = verify_io_u_crc64(hdr, io_u, hdr_num);
                  break;
            case VERIFY_CRC32C:
            case VERIFY_CRC32C_INTEL:
                  ret = verify_io_u_crc32c(hdr, io_u, hdr_num);
                  break;
            case VERIFY_CRC32:
                  ret = verify_io_u_crc32(hdr, io_u, hdr_num);
                  break;
            case VERIFY_CRC16:
                  ret = verify_io_u_crc16(hdr, io_u, hdr_num);
                  break;
            case VERIFY_CRC7:
                  ret = verify_io_u_crc7(hdr, io_u, hdr_num);
                  break;
            case VERIFY_SHA256:
                  ret = verify_io_u_sha256(hdr, io_u, hdr_num);
                  break;
            case VERIFY_SHA512:
                  ret = verify_io_u_sha512(hdr, io_u, hdr_num);
                  break;
            case VERIFY_META:
                  ret = verify_io_u_meta(hdr, td, io_u, hdr_num);
                  break;
            default:
                  log_err("Bad verify type %u\n", hdr->verify_type);
                  ret = EINVAL;
            }
      }

      return ret;
}

static void fill_meta(struct verify_header *hdr, struct thread_data *td,
                  struct io_u *io_u, unsigned int header_num)
{
      struct vhdr_meta *vh = hdr_priv(hdr);

      vh->thread = td->thread_number;

      vh->time_sec = io_u->start_time.tv_sec;
      vh->time_usec = io_u->start_time.tv_usec;

      vh->numberio = td->io_issues[DDIR_WRITE];

      vh->offset = io_u->offset + header_num * td->o.verify_interval;
}

static void fill_sha512(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_sha512 *vh = hdr_priv(hdr);
      struct sha512_ctx sha512_ctx = {
            .buf = vh->sha512,
      };

      sha512_init(&sha512_ctx);
      sha512_update(&sha512_ctx, p, len);
}

static void fill_sha256(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_sha256 *vh = hdr_priv(hdr);
      struct sha256_ctx sha256_ctx = {
            .buf = vh->sha256,
      };

      sha256_init(&sha256_ctx);
      sha256_update(&sha256_ctx, p, len);
}

static void fill_crc7(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_crc7 *vh = hdr_priv(hdr);

      vh->crc7 = crc7(p, len);
}

static void fill_crc16(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_crc16 *vh = hdr_priv(hdr);

      vh->crc16 = crc16(p, len);
}

static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_crc32 *vh = hdr_priv(hdr);

      vh->crc32 = crc32(p, len);
}

static void fill_crc32c(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_crc32 *vh = hdr_priv(hdr);

      if (hdr->verify_type == VERIFY_CRC32C_INTEL)
            vh->crc32 = crc32c_intel(p, len);
      else
            vh->crc32 = crc32c(p, len);
}

static void fill_crc64(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_crc64 *vh = hdr_priv(hdr);

      vh->crc64 = crc64(p, len);
}

static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
{
      struct vhdr_md5 *vh = hdr_priv(hdr);
      struct md5_ctx md5_ctx = {
            .hash = (uint32_t *) vh->md5_digest,
      };

      md5_init(&md5_ctx);
      md5_update(&md5_ctx, p, len);
}

/*
 * 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)
{
      struct verify_header *hdr;
      void *p = io_u->buf, *data;
      unsigned int hdr_inc, data_len, header_num = 0;

      if (td->o.verify == VERIFY_NULL)
            return;

      fill_pattern(td, p, io_u->buflen);

      hdr_inc = io_u->buflen;
      if (td->o.verify_interval)
            hdr_inc = td->o.verify_interval;

      for (; p < io_u->buf + io_u->buflen; p += hdr_inc) {
            hdr = p;

            hdr->fio_magic = FIO_HDR_MAGIC;
            hdr->verify_type = td->o.verify;
            hdr->len = hdr_inc;
            data_len = hdr_inc - hdr_size(hdr);

            data = p + hdr_size(hdr);
            switch (td->o.verify) {
            case VERIFY_MD5:
                  dprint(FD_VERIFY, "fill md5 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_md5(hdr, data, data_len);
                  break;
            case VERIFY_CRC64:
                  dprint(FD_VERIFY, "fill crc64 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_crc64(hdr, data, data_len);
                  break;
            case VERIFY_CRC32C:
            case VERIFY_CRC32C_INTEL:
                  dprint(FD_VERIFY, "fill crc32c io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_crc32c(hdr, data, data_len);
                  break;
            case VERIFY_CRC32:
                  dprint(FD_VERIFY, "fill crc32 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_crc32(hdr, data, data_len);
                  break;
            case VERIFY_CRC16:
                  dprint(FD_VERIFY, "fill crc16 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_crc16(hdr, data, data_len);
                  break;
            case VERIFY_CRC7:
                  dprint(FD_VERIFY, "fill crc7 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_crc7(hdr, data, data_len);
                  break;
            case VERIFY_SHA256:
                  dprint(FD_VERIFY, "fill sha256 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_sha256(hdr, data, data_len);
                  break;
            case VERIFY_SHA512:
                  dprint(FD_VERIFY, "fill sha512 io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_sha512(hdr, data, data_len);
                  break;
            case VERIFY_META:
                  dprint(FD_VERIFY, "fill meta io_u %p, len %u\n",
                                          io_u, hdr->len);
                  fill_meta(hdr, td, io_u, header_num);
                  break;
            default:
                  log_err("fio: bad verify type: %d\n", td->o.verify);
                  assert(0);
            }
            if (td->o.verify_offset)
                  memswp(p, p + td->o.verify_offset, hdr_size(hdr));
            header_num++;
      }
}

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 (!flist_empty(&td->io_hist_list)) {
            ipo = flist_entry(td->io_hist_list.next, struct io_piece, list);
            flist_del(&ipo->list);
      }

      if (ipo) {
            io_u->offset = ipo->offset;
            io_u->buflen = ipo->len;
            io_u->file = ipo->file;

            if (!fio_file_open(io_u->file)) {
                  int r = td_io_open_file(td, io_u->file);

                  if (r) {
                        dprint(FD_VERIFY, "failed file %s open\n",
                                    io_u->file->file_name);
                        return 1;
                  }
            }

            get_file(ipo->file);
            assert(fio_file_open(io_u->file));
            io_u->ddir = DDIR_READ;
            io_u->xfer_buf = io_u->buf;
            io_u->xfer_buflen = io_u->buflen;
            free(ipo);
            dprint(FD_VERIFY, "get_next_verify: ret io_u %p\n", io_u);
            return 0;
      }

      dprint(FD_VERIFY, "get_next_verify: empty\n");
      return 1;
}

static void *verify_async_thread(void *data)
{
      struct thread_data *td = data;
      struct io_u *io_u;
      int ret = 0;

      if (td->o.verify_cpumask_set &&
          fio_setaffinity(td->pid, td->o.verify_cpumask)) {
            log_err("fio: failed setting verify thread affinity\n");
            goto done;
      }

      do {
            FLIST_HEAD(list);

            read_barrier();
            if (td->verify_thread_exit)
                  break;

            pthread_mutex_lock(&td->io_u_lock);

            while (flist_empty(&td->verify_list) &&
                   !td->verify_thread_exit) {
                  ret = pthread_cond_wait(&td->verify_cond,
                                          &td->io_u_lock);
                  if (ret) {
                        pthread_mutex_unlock(&td->io_u_lock);
                        break;
                  }
            }

            flist_splice_init(&td->verify_list, &list);
            pthread_mutex_unlock(&td->io_u_lock);

            if (flist_empty(&list))
                  continue;

            while (!flist_empty(&list)) {
                  io_u = flist_entry(list.next, struct io_u, list);
                  flist_del_init(&io_u->list);

                  ret = verify_io_u(td, io_u);
                  put_io_u(td, io_u);
                  if (!ret)
                        continue;
                  if (td->o.continue_on_error &&
                      td_non_fatal_error(ret)) {
                        update_error_count(td, ret);
                        td_clear_error(td);
                        ret = 0;
                  }
            }
      } while (!ret);

      if (ret) {
            td_verror(td, ret, "async_verify");
            td->terminate = 1;
      }

done:
      pthread_mutex_lock(&td->io_u_lock);
      td->nr_verify_threads--;
      pthread_mutex_unlock(&td->io_u_lock);

      pthread_cond_signal(&td->free_cond);
      return NULL;
}

int verify_async_init(struct thread_data *td)
{
      int i, ret;

      td->verify_thread_exit = 0;

      td->verify_threads = malloc(sizeof(pthread_t) * td->o.verify_async);
      for (i = 0; i < td->o.verify_async; i++) {
            ret = pthread_create(&td->verify_threads[i], NULL,
                              verify_async_thread, td);
            if (ret) {
                  log_err("fio: async verify creation failed: %s\n",
                              strerror(ret));
                  break;
            }
            ret = pthread_detach(td->verify_threads[i]);
            if (ret) {
                  log_err("fio: async verify thread detach failed: %s\n",
                              strerror(ret));
                  break;
            }
            td->nr_verify_threads++;
      }

      if (i != td->o.verify_async) {
            log_err("fio: only %d verify threads started, exiting\n", i);
            td->verify_thread_exit = 1;
            write_barrier();
            pthread_cond_broadcast(&td->verify_cond);
            return 1;
      }

      return 0;
}

void verify_async_exit(struct thread_data *td)
{
      td->verify_thread_exit = 1;
      write_barrier();
      pthread_cond_broadcast(&td->verify_cond);

      pthread_mutex_lock(&td->io_u_lock);

      while (td->nr_verify_threads)
            pthread_cond_wait(&td->free_cond, &td->io_u_lock);

      pthread_mutex_unlock(&td->io_u_lock);
      free(td->verify_threads);
      td->verify_threads = NULL;
}

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