Merge branch 'dev' of https://github.com/smartxworks/fio
[fio.git] / verify.c
index 217b686..f79ab43 100644 (file)
--- a/verify.c
+++ b/verify.c
@@ -13,6 +13,7 @@
 #include "trim.h"
 #include "lib/rand.h"
 #include "lib/hweight.h"
+#include "lib/pattern.h"
 
 #include "crc/md5.h"
 #include "crc/crc64.h"
 #include "crc/sha512.h"
 #include "crc/sha1.h"
 #include "crc/xxhash.h"
+#include "crc/sha3.h"
 
 static void populate_hdr(struct thread_data *td, struct io_u *io_u,
                         struct verify_header *hdr, unsigned int header_num,
                         unsigned int header_len);
+static void __fill_hdr(struct thread_data *td, struct io_u *io_u,
+                      struct verify_header *hdr, unsigned int header_num,
+                      unsigned int header_len, uint64_t rand_seed);
 
-static void fill_pattern(struct thread_data *td, void *p, unsigned int len,
-                        char *pattern, unsigned int pattern_bytes)
+void fill_buffer_pattern(struct thread_data *td, void *p, unsigned int len)
 {
-       switch (pattern_bytes) {
-       case 0:
-               assert(0);
-               break;
-       case 1:
-               dprint(FD_VERIFY, "fill verify pattern b=0 len=%u\n", len);
-               memset(p, pattern[0], len);
-               break;
-       default: {
-               unsigned int i = 0, size = 0;
-               unsigned char *b = p;
-
-               dprint(FD_VERIFY, "fill verify pattern b=%d len=%u\n",
-                                       pattern_bytes, len);
-
-               while (i < len) {
-                       size = pattern_bytes;
-                       if (size > (len - i))
-                               size = len - i;
-                       memcpy(b+i, pattern, size);
-                       i += size;
-               }
-               break;
-               }
-       }
+       (void)cpy_pattern(td->o.buffer_pattern, td->o.buffer_pattern_bytes, p, len);
 }
 
-void fill_buffer_pattern(struct thread_data *td, void *p, unsigned int len)
+static void __fill_buffer(struct thread_options *o, uint64_t seed, void *p,
+                         unsigned int len)
 {
-       fill_pattern(td, p, len, td->o.buffer_pattern, td->o.buffer_pattern_bytes);
+       __fill_random_buf_percentage(seed, p, o->compress_percentage, len, len, o->buffer_pattern, o->buffer_pattern_bytes);
+}
+
+static uint64_t fill_buffer(struct thread_data *td, void *p,
+                           unsigned int len)
+{
+       struct frand_state *fs = &td->verify_state;
+       struct thread_options *o = &td->o;
+
+       return fill_random_buf_percentage(fs, p, o->compress_percentage, len, len, o->buffer_pattern, o->buffer_pattern_bytes);
 }
 
 void fill_verify_pattern(struct thread_data *td, void *p, unsigned int len,
-                        struct io_u *io_u, unsigned long seed, int use_seed)
+                        struct io_u *io_u, uint64_t seed, int use_seed)
 {
-       if (!td->o.verify_pattern_bytes) {
+       struct thread_options *o = &td->o;
+
+       if (!o->verify_pattern_bytes) {
                dprint(FD_VERIFY, "fill random bytes len=%u\n", len);
 
                if (use_seed)
-                       __fill_random_buf(p, len, seed);
+                       __fill_buffer(o, seed, p, len);
                else
-                       io_u->rand_seed = fill_random_buf(&td->__verify_state, p, len);
+                       io_u->rand_seed = fill_buffer(td, p, len);
                return;
        }
 
-       if (io_u->buf_filled_len >= len) {
+       /* Skip if we were here and we do not need to patch pattern
+        * with format */
+       if (!td->o.verify_fmt_sz && io_u->buf_filled_len >= len) {
                dprint(FD_VERIFY, "using already filled verify pattern b=%d len=%u\n",
-                       td->o.verify_pattern_bytes, len);
+                       o->verify_pattern_bytes, len);
                return;
        }
 
-       fill_pattern(td, p, len, td->o.verify_pattern, td->o.verify_pattern_bytes);
-
+       (void)paste_format(td->o.verify_pattern, td->o.verify_pattern_bytes,
+                          td->o.verify_fmt, td->o.verify_fmt_sz,
+                          p, len, io_u);
        io_u->buf_filled_len = len;
 }
 
@@ -92,15 +87,20 @@ static unsigned int get_hdr_inc(struct thread_data *td, struct io_u *io_u)
 {
        unsigned int hdr_inc;
 
+       /*
+        * If we use bs_unaligned, buflen can be larger than the verify
+        * interval (which just defaults to the smallest blocksize possible).
+        */
        hdr_inc = io_u->buflen;
-       if (td->o.verify_interval && td->o.verify_interval <= io_u->buflen)
+       if (td->o.verify_interval && td->o.verify_interval <= io_u->buflen &&
+           !td->o.bs_unaligned)
                hdr_inc = td->o.verify_interval;
 
        return hdr_inc;
 }
 
 static void fill_pattern_headers(struct thread_data *td, struct io_u *io_u,
-                                unsigned long seed, int use_seed)
+                                uint64_t seed, int use_seed)
 {
        unsigned int hdr_inc, header_num;
        struct verify_header *hdr;
@@ -147,7 +147,9 @@ static inline unsigned int __hdr_size(int verify_type)
 
        switch (verify_type) {
        case VERIFY_NONE:
+       case VERIFY_HDR_ONLY:
        case VERIFY_NULL:
+       case VERIFY_PATTERN:
                len = 0;
                break;
        case VERIFY_MD5:
@@ -173,18 +175,26 @@ static inline unsigned int __hdr_size(int verify_type)
        case VERIFY_SHA512:
                len = sizeof(struct vhdr_sha512);
                break;
+       case VERIFY_SHA3_224:
+               len = sizeof(struct vhdr_sha3_224);
+               break;
+       case VERIFY_SHA3_256:
+               len = sizeof(struct vhdr_sha3_256);
+               break;
+       case VERIFY_SHA3_384:
+               len = sizeof(struct vhdr_sha3_384);
+               break;
+       case VERIFY_SHA3_512:
+               len = sizeof(struct vhdr_sha3_512);
+               break;
        case VERIFY_XXHASH:
                len = sizeof(struct vhdr_xxhash);
                break;
-       case VERIFY_META:
-               len = sizeof(struct vhdr_meta);
-               break;
        case VERIFY_SHA1:
                len = sizeof(struct vhdr_sha1);
                break;
-       case VERIFY_PATTERN:
-               len = 0;
-               break;
+       case VERIFY_PATTERN_NO_HDR:
+               return 0;
        default:
                log_err("fio: unknown verify header!\n");
                assert(0);
@@ -193,8 +203,12 @@ static inline unsigned int __hdr_size(int verify_type)
        return len + sizeof(struct verify_header);
 }
 
-static inline unsigned int hdr_size(struct verify_header *hdr)
+static inline unsigned int hdr_size(struct thread_data *td,
+                                   struct verify_header *hdr)
 {
+       if (td->o.verify == VERIFY_PATTERN_NO_HDR)
+               return 0;
+
        return __hdr_size(hdr->verify_type);
 }
 
@@ -227,36 +241,27 @@ struct vcont {
 };
 
 #define DUMP_BUF_SZ    255
-static int dump_buf_warned;
 
 static void dump_buf(char *buf, unsigned int len, unsigned long long offset,
                     const char *type, struct fio_file *f)
 {
-       char *ptr, fname[DUMP_BUF_SZ];
-       size_t buf_left = DUMP_BUF_SZ;
+       char *ptr, *fname;
+       char sep[2] = { FIO_OS_PATH_SEPARATOR, 0 };
        int ret, fd;
 
        ptr = strdup(f->file_name);
 
-       fname[DUMP_BUF_SZ - 1] = '\0';
-       strncpy(fname, basename(ptr), DUMP_BUF_SZ - 1);
-
-       buf_left -= strlen(fname);
-       if (buf_left <= 0) {
-               if (!dump_buf_warned) {
-                       log_err("fio: verify failure dump buffer too small\n");
-                       dump_buf_warned = 1;
-               }
-               free(ptr);
-               return;
+       if (asprintf(&fname, "%s%s%s.%llu.%s", aux_path ? : "",
+                    aux_path ? sep : "", basename(ptr), offset, type) < 0) {
+               if (!fio_did_warn(FIO_WARN_VERIFY_BUF))
+                       log_err("fio: not enough memory for dump buffer filename\n");
+               goto free_ptr;
        }
 
-       snprintf(fname + strlen(fname), buf_left, ".%llu.%s", offset, type);
-
        fd = open(fname, O_CREAT | O_TRUNC | O_WRONLY, 0644);
        if (fd < 0) {
                perror("open verify buf file");
-               return;
+               goto free_fname;
        }
 
        while (len) {
@@ -273,6 +278,11 @@ static void dump_buf(char *buf, unsigned int len, unsigned long long offset,
 
        close(fd);
        log_err("       %s data dumped as %s\n", type, fname);
+
+free_fname:
+       free(fname);
+
+free_ptr:
        free(ptr);
 }
 
@@ -280,7 +290,7 @@ static void dump_buf(char *buf, unsigned int len, unsigned long long offset,
  * Dump the contents of the read block and re-generate the correct data
  * and dump that too.
  */
-static void dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
+static void __dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
 {
        struct thread_data *td = vc->td;
        struct io_u *io_u = vc->io_u;
@@ -316,14 +326,29 @@ static void dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
        free(buf);
 }
 
+static void dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
+{
+       struct thread_data *td = vc->td;
+       struct verify_header shdr;
+
+       if (td->o.verify == VERIFY_PATTERN_NO_HDR) {
+               __fill_hdr(td, vc->io_u, &shdr, 0, vc->io_u->buflen, 0);
+               hdr = &shdr;
+       }
+
+       __dump_verify_buffers(hdr, vc);
+}
+
 static void log_verify_failure(struct verify_header *hdr, struct vcont *vc)
 {
        unsigned long long offset;
 
        offset = vc->io_u->offset;
        offset += vc->hdr_num * hdr->len;
-       log_err("%.8s: verify failed at file %s offset %llu, length %u\n",
-                       vc->name, vc->io_u->file->file_name, offset, hdr->len);
+       log_err("%.8s: verify failed at file %s offset %llu, length %u"
+                       " (requested block: offset=%llu, length=%llu)\n",
+                       vc->name, vc->io_u->file->file_name, offset, hdr->len,
+                       vc->io_u->offset, vc->io_u->buflen);
 
        if (vc->good_crc && vc->bad_crc) {
                log_err("       Expected CRC: ");
@@ -340,7 +365,7 @@ static void log_verify_failure(struct verify_header *hdr, struct vcont *vc)
  */
 static inline void *io_u_verify_off(struct verify_header *hdr, struct vcont *vc)
 {
-       return vc->io_u->buf + vc->hdr_num * hdr->len + hdr_size(hdr);
+       return vc->io_u->buf + vc->hdr_num * hdr->len + hdr_size(vc->td, hdr);
 }
 
 static int verify_io_u_pattern(struct verify_header *hdr, struct vcont *vc)
@@ -349,35 +374,37 @@ static int verify_io_u_pattern(struct verify_header *hdr, struct vcont *vc)
        struct io_u *io_u = vc->io_u;
        char *buf, *pattern;
        unsigned int header_size = __hdr_size(td->o.verify);
-       unsigned int len, mod, i, size, pattern_size;
+       unsigned int len, mod, i, pattern_size;
+       int rc;
 
        pattern = td->o.verify_pattern;
        pattern_size = td->o.verify_pattern_bytes;
-       if (pattern_size <= 1)
-               pattern_size = MAX_PATTERN_SIZE;
-       buf = (void *) hdr + header_size;
+       assert(pattern_size != 0);
+
+       (void)paste_format_inplace(pattern, pattern_size,
+                                  td->o.verify_fmt, td->o.verify_fmt_sz, io_u);
+
+       buf = (char *) hdr + header_size;
        len = get_hdr_inc(td, io_u) - header_size;
-       mod = header_size % pattern_size;
-
-       for (i = 0; i < len; i += size) {
-               size = pattern_size - mod;
-               if (size > (len - i))
-                       size = len - i;
-               if (memcmp(buf + i, pattern + mod, size))
-                       /* Let the slow compare find the first mismatch byte. */
-                       break;
-               mod = 0;
-       }
+       mod = (get_hdr_inc(td, io_u) * vc->hdr_num + header_size) % pattern_size;
 
-       for (; i < len; i++) {
+       rc = cmp_pattern(pattern, pattern_size, mod, buf, len);
+       if (!rc)
+               return 0;
+
+       /* Slow path, compare each byte */
+       for (i = 0; i < len; i++) {
                if (buf[i] != pattern[mod]) {
                        unsigned int bits;
 
                        bits = hweight8(buf[i] ^ pattern[mod]);
-                       log_err("fio: got pattern %x, wanted %x. Bad bits %d\n",
-                               buf[i], pattern[mod], bits);
+                       log_err("fio: got pattern '%02x', wanted '%02x'. Bad bits %d\n",
+                               (unsigned char)buf[i],
+                               (unsigned char)pattern[mod],
+                               bits);
                        log_err("fio: bad pattern block offset %u\n", i);
-                       dump_verify_buffers(hdr, vc);
+                       vc->name = "pattern";
+                       log_verify_failure(hdr, vc);
                        return EILSEQ;
                }
                mod++;
@@ -385,43 +412,9 @@ static int verify_io_u_pattern(struct verify_header *hdr, struct vcont *vc)
                        mod = 0;
        }
 
-       return 0;
-}
-
-static int verify_io_u_meta(struct verify_header *hdr, struct vcont *vc)
-{
-       struct thread_data *td = vc->td;
-       struct vhdr_meta *vh = hdr_priv(hdr);
-       struct io_u *io_u = vc->io_u;
-       int ret = EILSEQ;
-
-       dprint(FD_VERIFY, "meta verify io_u %p, len %u\n", io_u, hdr->len);
-
-       if (vh->offset == io_u->offset + vc->hdr_num * td->o.verify_interval)
-               ret = 0;
-
-       if (td->o.verify_pattern_bytes)
-               ret |= verify_io_u_pattern(hdr, vc);
-
-       /*
-        * For read-only workloads, the program cannot be certain of the
-        * last numberio written to a block. Checking of numberio will be
-        * done only for workloads that write data.  For verify_only,
-        * numberio will be checked in the last iteration when the correct
-        * state of numberio, that would have been written to each block
-        * in a previous run of fio, has been reached.
-        */
-       if ((td_write(td) || td_rw(td)) && (td_min_bs(td) == td_max_bs(td)))
-               if (!td->o.verify_only || td->o.loops == 0)
-                       if (vh->numberio != io_u->numberio)
-                               ret = EILSEQ;
-
-       if (!ret)
-               return 0;
-
-       vc->name = "meta";
-       log_verify_failure(hdr, vc);
-       return ret;
+       /* Unreachable line */
+       assert(0);
+       return EILSEQ;
 }
 
 static int verify_io_u_xxhash(struct verify_header *hdr, struct vcont *vc)
@@ -434,7 +427,7 @@ static int verify_io_u_xxhash(struct verify_header *hdr, struct vcont *vc)
        dprint(FD_VERIFY, "xxhash verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
        state = XXH32_init(1);
-       XXH32_update(state, p, hdr->len - hdr_size(hdr));
+       XXH32_update(state, p, hdr->len - hdr_size(vc->td, hdr));
        hash = XXH32_digest(state);
 
        if (vh->hash == hash)
@@ -448,6 +441,84 @@ static int verify_io_u_xxhash(struct verify_header *hdr, struct vcont *vc)
        return EILSEQ;
 }
 
+static int verify_io_u_sha3(struct verify_header *hdr, struct vcont *vc,
+                           struct fio_sha3_ctx *sha3_ctx, uint8_t *sha,
+                           unsigned int sha_size, const char *name)
+{
+       void *p = io_u_verify_off(hdr, vc);
+
+       dprint(FD_VERIFY, "%s verify io_u %p, len %u\n", name, vc->io_u, hdr->len);
+
+       fio_sha3_update(sha3_ctx, p, hdr->len - hdr_size(vc->td, hdr));
+       fio_sha3_final(sha3_ctx);
+
+       if (!memcmp(sha, sha3_ctx->sha, sha_size))
+               return 0;
+
+       vc->name = name;
+       vc->good_crc = sha;
+       vc->bad_crc = sha3_ctx->sha;
+       vc->crc_len = sha_size;
+       log_verify_failure(hdr, vc);
+       return EILSEQ;
+}
+
+static int verify_io_u_sha3_224(struct verify_header *hdr, struct vcont *vc)
+{
+       struct vhdr_sha3_224 *vh = hdr_priv(hdr);
+       uint8_t sha[SHA3_224_DIGEST_SIZE];
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = sha,
+       };
+
+       fio_sha3_224_init(&sha3_ctx);
+
+       return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
+                               SHA3_224_DIGEST_SIZE, "sha3-224");
+}
+
+static int verify_io_u_sha3_256(struct verify_header *hdr, struct vcont *vc)
+{
+       struct vhdr_sha3_256 *vh = hdr_priv(hdr);
+       uint8_t sha[SHA3_256_DIGEST_SIZE];
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = sha,
+       };
+
+       fio_sha3_256_init(&sha3_ctx);
+
+       return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
+                               SHA3_256_DIGEST_SIZE, "sha3-256");
+}
+
+static int verify_io_u_sha3_384(struct verify_header *hdr, struct vcont *vc)
+{
+       struct vhdr_sha3_384 *vh = hdr_priv(hdr);
+       uint8_t sha[SHA3_384_DIGEST_SIZE];
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = sha,
+       };
+
+       fio_sha3_384_init(&sha3_ctx);
+
+       return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
+                               SHA3_384_DIGEST_SIZE, "sha3-384");
+}
+
+static int verify_io_u_sha3_512(struct verify_header *hdr, struct vcont *vc)
+{
+       struct vhdr_sha3_512 *vh = hdr_priv(hdr);
+       uint8_t sha[SHA3_512_DIGEST_SIZE];
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = sha,
+       };
+
+       fio_sha3_512_init(&sha3_ctx);
+
+       return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
+                               SHA3_512_DIGEST_SIZE, "sha3-512");
+}
+
 static int verify_io_u_sha512(struct verify_header *hdr, struct vcont *vc)
 {
        void *p = io_u_verify_off(hdr, vc);
@@ -460,7 +531,7 @@ static int verify_io_u_sha512(struct verify_header *hdr, struct vcont *vc)
        dprint(FD_VERIFY, "sha512 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
        fio_sha512_init(&sha512_ctx);
-       fio_sha512_update(&sha512_ctx, p, hdr->len - hdr_size(hdr));
+       fio_sha512_update(&sha512_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 
        if (!memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512)))
                return 0;
@@ -485,7 +556,8 @@ static int verify_io_u_sha256(struct verify_header *hdr, struct vcont *vc)
        dprint(FD_VERIFY, "sha256 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
        fio_sha256_init(&sha256_ctx);
-       fio_sha256_update(&sha256_ctx, p, hdr->len - hdr_size(hdr));
+       fio_sha256_update(&sha256_ctx, p, hdr->len - hdr_size(vc->td, hdr));
+       fio_sha256_final(&sha256_ctx);
 
        if (!memcmp(vh->sha256, sha256_ctx.buf, sizeof(sha256)))
                return 0;
@@ -510,7 +582,8 @@ static int verify_io_u_sha1(struct verify_header *hdr, struct vcont *vc)
        dprint(FD_VERIFY, "sha1 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
        fio_sha1_init(&sha1_ctx);
-       fio_sha1_update(&sha1_ctx, p, hdr->len - hdr_size(hdr));
+       fio_sha1_update(&sha1_ctx, p, hdr->len - hdr_size(vc->td, hdr));
+       fio_sha1_final(&sha1_ctx);
 
        if (!memcmp(vh->sha1, sha1_ctx.H, sizeof(sha1)))
                return 0;
@@ -531,7 +604,7 @@ static int verify_io_u_crc7(struct verify_header *hdr, struct vcont *vc)
 
        dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
-       c = fio_crc7(p, hdr->len - hdr_size(hdr));
+       c = fio_crc7(p, hdr->len - hdr_size(vc->td, hdr));
 
        if (c == vh->crc7)
                return 0;
@@ -552,7 +625,7 @@ static int verify_io_u_crc16(struct verify_header *hdr, struct vcont *vc)
 
        dprint(FD_VERIFY, "crc16 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
-       c = fio_crc16(p, hdr->len - hdr_size(hdr));
+       c = fio_crc16(p, hdr->len - hdr_size(vc->td, hdr));
 
        if (c == vh->crc16)
                return 0;
@@ -573,7 +646,7 @@ static int verify_io_u_crc64(struct verify_header *hdr, struct vcont *vc)
 
        dprint(FD_VERIFY, "crc64 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
-       c = fio_crc64(p, hdr->len - hdr_size(hdr));
+       c = fio_crc64(p, hdr->len - hdr_size(vc->td, hdr));
 
        if (c == vh->crc64)
                return 0;
@@ -594,7 +667,7 @@ static int verify_io_u_crc32(struct verify_header *hdr, struct vcont *vc)
 
        dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
-       c = fio_crc32(p, hdr->len - hdr_size(hdr));
+       c = fio_crc32(p, hdr->len - hdr_size(vc->td, hdr));
 
        if (c == vh->crc32)
                return 0;
@@ -615,7 +688,7 @@ static int verify_io_u_crc32c(struct verify_header *hdr, struct vcont *vc)
 
        dprint(FD_VERIFY, "crc32c verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
-       c = fio_crc32c(p, hdr->len - hdr_size(hdr));
+       c = fio_crc32c(p, hdr->len - hdr_size(vc->td, hdr));
 
        if (c == vh->crc32)
                return 0;
@@ -640,7 +713,8 @@ static int verify_io_u_md5(struct verify_header *hdr, struct vcont *vc)
        dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 
        fio_md5_init(&md5_ctx);
-       fio_md5_update(&md5_ctx, p, hdr->len - hdr_size(hdr));
+       fio_md5_update(&md5_ctx, p, hdr->len - hdr_size(vc->td, hdr));
+       fio_md5_final(&md5_ctx);
 
        if (!memcmp(vh->md5_digest, md5_ctx.hash, sizeof(hash)))
                return 0;
@@ -667,52 +741,78 @@ int verify_io_u_async(struct thread_data *td, struct io_u **io_u_ptr)
 
        if (io_u->flags & IO_U_F_IN_CUR_DEPTH) {
                td->cur_depth--;
-               io_u->flags &= ~IO_U_F_IN_CUR_DEPTH;
+               io_u_clear(td, io_u, IO_U_F_IN_CUR_DEPTH);
        }
        flist_add_tail(&io_u->verify_list, &td->verify_list);
        *io_u_ptr = NULL;
-       pthread_mutex_unlock(&td->io_u_lock);
 
        pthread_cond_signal(&td->verify_cond);
+       pthread_mutex_unlock(&td->io_u_lock);
        return 0;
 }
 
+/*
+ * Thanks Rusty, for spending the time so I don't have to.
+ *
+ * http://rusty.ozlabs.org/?p=560
+ */
+static int mem_is_zero(const void *data, size_t length)
+{
+       const unsigned char *p = data;
+       size_t len;
+
+       /* Check first 16 bytes manually */
+       for (len = 0; len < 16; len++) {
+               if (!length)
+                       return 1;
+               if (*p)
+                       return 0;
+               p++;
+               length--;
+       }
+
+       /* Now we know that's zero, memcmp with self. */
+       return memcmp(data, p, length) == 0;
+}
+
+static int mem_is_zero_slow(const void *data, size_t length, size_t *offset)
+{
+       const unsigned char *p = data;
+
+       *offset = 0;
+       while (length) {
+               if (*p)
+                       break;
+               (*offset)++;
+               length--;
+               p++;
+       }
+
+       return !length;
+}
+
 static int verify_trimmed_io_u(struct thread_data *td, struct io_u *io_u)
 {
-       static char zero_buf[1024];
-       unsigned int this_len, len;
-       int ret = 0;
-       void *p;
+       size_t offset;
 
        if (!td->o.trim_zero)
                return 0;
 
-       len = io_u->buflen;
-       p = io_u->buf;
-       do {
-               this_len = sizeof(zero_buf);
-               if (this_len > len)
-                       this_len = len;
-               if (memcmp(p, zero_buf, this_len)) {
-                       ret = EILSEQ;
-                       break;
-               }
-               len -= this_len;
-               p += this_len;
-       } while (len);
-
-       if (!ret)
+       if (mem_is_zero(io_u->buf, io_u->buflen))
                return 0;
 
-       log_err("trim: verify failed at file %s offset %llu, length %lu"
+       mem_is_zero_slow(io_u->buf, io_u->buflen, &offset);
+
+       log_err("trim: verify failed at file %s offset %llu, length %llu"
                ", block offset %lu\n",
                        io_u->file->file_name, io_u->offset, io_u->buflen,
-                       (unsigned long) (p - io_u->buf));
-       return ret;
+                       (unsigned long) offset);
+       return EILSEQ;
 }
 
-static int verify_header(struct io_u *io_u, struct verify_header *hdr,
-                        unsigned int hdr_num, unsigned int hdr_len)
+static int verify_header(struct io_u *io_u, struct thread_data *td,
+                        struct verify_header *hdr, unsigned int hdr_num,
+                        unsigned int hdr_len)
 {
        void *p = hdr;
        uint32_t crc;
@@ -733,6 +833,30 @@ static int verify_header(struct io_u *io_u, struct verify_header *hdr,
                        hdr->rand_seed, io_u->rand_seed);
                goto err;
        }
+       if (hdr->offset != io_u->offset + hdr_num * td->o.verify_interval) {
+               log_err("verify: bad header offset %"PRIu64
+                       ", wanted %llu",
+                       hdr->offset, io_u->offset);
+               goto err;
+       }
+
+       /*
+        * For read-only workloads, the program cannot be certain of the
+        * last numberio written to a block. Checking of numberio will be
+        * done only for workloads that write data.  For verify_only,
+        * numberio will be checked in the last iteration when the correct
+        * state of numberio, that would have been written to each block
+        * in a previous run of fio, has been reached.
+        */
+       if (td_write(td) && (td_min_bs(td) == td_max_bs(td)) &&
+           !td->o.time_based)
+               if (!td->o.verify_only || td->o.loops == 0)
+                       if (hdr->numberio != io_u->numberio) {
+                               log_err("verify: bad header numberio %"PRIu16
+                                       ", wanted %"PRIu16,
+                                       hdr->numberio, io_u->numberio);
+                               goto err;
+                       }
 
        crc = fio_crc32c(p, offsetof(struct verify_header, crc32));
        if (crc != hdr->crc32) {
@@ -743,9 +867,16 @@ static int verify_header(struct io_u *io_u, struct verify_header *hdr,
        return 0;
 
 err:
-       log_err(" at file %s offset %llu, length %u\n",
+       log_err(" at file %s offset %llu, length %u"
+               " (requested block: offset=%llu, length=%llu)\n",
                io_u->file->file_name,
-               io_u->offset + hdr_num * hdr_len, hdr_len);
+               io_u->offset + hdr_num * hdr_len, hdr_len,
+               io_u->offset, io_u->buflen);
+
+       if (td->o.verify_dump)
+               dump_buf(p, hdr_len, io_u->offset + hdr_num * hdr_len,
+                               "hdr_fail", io_u->file);
+
        return EILSEQ;
 }
 
@@ -759,6 +890,13 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
 
        if (td->o.verify == VERIFY_NULL || io_u->ddir != DDIR_READ)
                return 0;
+       /*
+        * If the IO engine is faking IO (like null), then just pretend
+        * we verified everything.
+        */
+       if (td_ioengine_flagged(td, FIO_FAKEIO))
+               return 0;
+
        if (io_u->flags & IO_U_F_TRIMMED) {
                ret = verify_trimmed_io_u(td, io_u);
                goto done;
@@ -785,15 +923,16 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
                hdr = p;
 
                /*
-                * Make rand_seed check pass when have verifysort or
-                * verify_backlog.
+                * Make rand_seed check pass when have verify_backlog.
                 */
-               if (td->o.verifysort || (td->flags & TD_F_VER_BACKLOG))
+               if (!td_rw(td) || (td->flags & TD_F_VER_BACKLOG))
                        io_u->rand_seed = hdr->rand_seed;
 
-               ret = verify_header(io_u, hdr, hdr_num, hdr_inc);
-               if (ret)
-                       return ret;
+               if (td->o.verify != VERIFY_PATTERN_NO_HDR) {
+                       ret = verify_header(io_u, td, hdr, hdr_num, hdr_inc);
+                       if (ret)
+                               return ret;
+               }
 
                if (td->o.verify != VERIFY_NONE)
                        verify_type = td->o.verify;
@@ -801,6 +940,12 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
                        verify_type = hdr->verify_type;
 
                switch (verify_type) {
+               case VERIFY_HDR_ONLY:
+                       /* Header is always verified, check if pattern is left
+                        * for verification. */
+                       if (td->o.verify_pattern_bytes)
+                               ret = verify_io_u_pattern(hdr, &vc);
+                       break;
                case VERIFY_MD5:
                        ret = verify_io_u_md5(hdr, &vc);
                        break;
@@ -826,16 +971,26 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
                case VERIFY_SHA512:
                        ret = verify_io_u_sha512(hdr, &vc);
                        break;
+               case VERIFY_SHA3_224:
+                       ret = verify_io_u_sha3_224(hdr, &vc);
+                       break;
+               case VERIFY_SHA3_256:
+                       ret = verify_io_u_sha3_256(hdr, &vc);
+                       break;
+               case VERIFY_SHA3_384:
+                       ret = verify_io_u_sha3_384(hdr, &vc);
+                       break;
+               case VERIFY_SHA3_512:
+                       ret = verify_io_u_sha3_512(hdr, &vc);
+                       break;
                case VERIFY_XXHASH:
                        ret = verify_io_u_xxhash(hdr, &vc);
                        break;
-               case VERIFY_META:
-                       ret = verify_io_u_meta(hdr, &vc);
-                       break;
                case VERIFY_SHA1:
                        ret = verify_io_u_sha1(hdr, &vc);
                        break;
                case VERIFY_PATTERN:
+               case VERIFY_PATTERN_NO_HDR:
                        ret = verify_io_u_pattern(hdr, &vc);
                        break;
                default:
@@ -855,29 +1010,64 @@ done:
        return ret;
 }
 
-static void fill_meta(struct verify_header *hdr, struct thread_data *td,
-                     struct io_u *io_u, unsigned int header_num)
+static void fill_xxhash(struct verify_header *hdr, void *p, unsigned int len)
 {
-       struct vhdr_meta *vh = hdr_priv(hdr);
+       struct vhdr_xxhash *vh = hdr_priv(hdr);
+       void *state;
 
-       vh->thread = td->thread_number;
+       state = XXH32_init(1);
+       XXH32_update(state, p, len);
+       vh->hash = XXH32_digest(state);
+}
 
-       vh->time_sec = io_u->start_time.tv_sec;
-       vh->time_usec = io_u->start_time.tv_usec;
+static void fill_sha3(struct fio_sha3_ctx *sha3_ctx, void *p, unsigned int len)
+{
+       fio_sha3_update(sha3_ctx, p, len);
+       fio_sha3_final(sha3_ctx);
+}
 
-       vh->numberio = io_u->numberio;
+static void fill_sha3_224(struct verify_header *hdr, void *p, unsigned int len)
+{
+       struct vhdr_sha3_224 *vh = hdr_priv(hdr);
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = vh->sha,
+       };
 
-       vh->offset = io_u->offset + header_num * td->o.verify_interval;
+       fio_sha3_224_init(&sha3_ctx);
+       fill_sha3(&sha3_ctx, p, len);
 }
 
-static void fill_xxhash(struct verify_header *hdr, void *p, unsigned int len)
+static void fill_sha3_256(struct verify_header *hdr, void *p, unsigned int len)
 {
-       struct vhdr_xxhash *vh = hdr_priv(hdr);
-       void *state;
+       struct vhdr_sha3_256 *vh = hdr_priv(hdr);
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = vh->sha,
+       };
 
-       state = XXH32_init(1);
-       XXH32_update(state, p, len);
-       vh->hash = XXH32_digest(state);
+       fio_sha3_256_init(&sha3_ctx);
+       fill_sha3(&sha3_ctx, p, len);
+}
+
+static void fill_sha3_384(struct verify_header *hdr, void *p, unsigned int len)
+{
+       struct vhdr_sha3_384 *vh = hdr_priv(hdr);
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = vh->sha,
+       };
+
+       fio_sha3_384_init(&sha3_ctx);
+       fill_sha3(&sha3_ctx, p, len);
+}
+
+static void fill_sha3_512(struct verify_header *hdr, void *p, unsigned int len)
+{
+       struct vhdr_sha3_512 *vh = hdr_priv(hdr);
+       struct fio_sha3_ctx sha3_ctx = {
+               .sha = vh->sha,
+       };
+
+       fio_sha3_512_init(&sha3_ctx);
+       fill_sha3(&sha3_ctx, p, len);
 }
 
 static void fill_sha512(struct verify_header *hdr, void *p, unsigned int len)
@@ -900,6 +1090,7 @@ static void fill_sha256(struct verify_header *hdr, void *p, unsigned int len)
 
        fio_sha256_init(&sha256_ctx);
        fio_sha256_update(&sha256_ctx, p, len);
+       fio_sha256_final(&sha256_ctx);
 }
 
 static void fill_sha1(struct verify_header *hdr, void *p, unsigned int len)
@@ -911,6 +1102,7 @@ static void fill_sha1(struct verify_header *hdr, void *p, unsigned int len)
 
        fio_sha1_init(&sha1_ctx);
        fio_sha1_update(&sha1_ctx, p, len);
+       fio_sha1_final(&sha1_ctx);
 }
 
 static void fill_crc7(struct verify_header *hdr, void *p, unsigned int len)
@@ -957,6 +1149,34 @@ static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
 
        fio_md5_init(&md5_ctx);
        fio_md5_update(&md5_ctx, p, len);
+       fio_md5_final(&md5_ctx);
+}
+
+static void __fill_hdr(struct thread_data *td, struct io_u *io_u,
+                      struct verify_header *hdr, unsigned int header_num,
+                      unsigned int header_len, uint64_t rand_seed)
+{
+       void *p = hdr;
+
+       hdr->magic = FIO_HDR_MAGIC;
+       hdr->verify_type = td->o.verify;
+       hdr->len = header_len;
+       hdr->rand_seed = rand_seed;
+       hdr->offset = io_u->offset + header_num * td->o.verify_interval;
+       hdr->time_sec = io_u->start_time.tv_sec;
+       hdr->time_nsec = io_u->start_time.tv_nsec;
+       hdr->thread = td->thread_number;
+       hdr->numberio = io_u->numberio;
+       hdr->crc32 = fio_crc32c(p, offsetof(struct verify_header, crc32));
+}
+
+
+static void fill_hdr(struct thread_data *td, struct io_u *io_u,
+                    struct verify_header *hdr, unsigned int header_num,
+                    unsigned int header_len, uint64_t rand_seed)
+{
+       if (td->o.verify != VERIFY_PATTERN_NO_HDR)
+               __fill_hdr(td, io_u, hdr, header_num, header_len, rand_seed);
 }
 
 static void populate_hdr(struct thread_data *td, struct io_u *io_u,
@@ -964,19 +1184,16 @@ static void populate_hdr(struct thread_data *td, struct io_u *io_u,
                         unsigned int header_len)
 {
        unsigned int data_len;
-       void *data, *p;
+       void *data;
+       char *p;
 
-       p = (void *) hdr;
+       p = (char *) hdr;
 
-       hdr->magic = FIO_HDR_MAGIC;
-       hdr->verify_type = td->o.verify;
-       hdr->len = header_len;
-       hdr->rand_seed = io_u->rand_seed;
-       hdr->crc32 = fio_crc32c(p, offsetof(struct verify_header, crc32));
+       fill_hdr(td, io_u, hdr, header_num, header_len, io_u->rand_seed);
 
-       data_len = header_len - hdr_size(hdr);
+       data_len = header_len - hdr_size(td, hdr);
 
-       data = p + hdr_size(hdr);
+       data = p + hdr_size(td, hdr);
        switch (td->o.verify) {
        case VERIFY_MD5:
                dprint(FD_VERIFY, "fill md5 io_u %p, len %u\n",
@@ -1019,30 +1236,48 @@ static void populate_hdr(struct thread_data *td, struct io_u *io_u,
                                                io_u, hdr->len);
                fill_sha512(hdr, data, data_len);
                break;
+       case VERIFY_SHA3_224:
+               dprint(FD_VERIFY, "fill sha3-224 io_u %p, len %u\n",
+                                               io_u, hdr->len);
+               fill_sha3_224(hdr, data, data_len);
+               break;
+       case VERIFY_SHA3_256:
+               dprint(FD_VERIFY, "fill sha3-256 io_u %p, len %u\n",
+                                               io_u, hdr->len);
+               fill_sha3_256(hdr, data, data_len);
+               break;
+       case VERIFY_SHA3_384:
+               dprint(FD_VERIFY, "fill sha3-384 io_u %p, len %u\n",
+                                               io_u, hdr->len);
+               fill_sha3_384(hdr, data, data_len);
+               break;
+       case VERIFY_SHA3_512:
+               dprint(FD_VERIFY, "fill sha3-512 io_u %p, len %u\n",
+                                               io_u, hdr->len);
+               fill_sha3_512(hdr, data, data_len);
+               break;
        case VERIFY_XXHASH:
                dprint(FD_VERIFY, "fill xxhash io_u %p, len %u\n",
                                                io_u, hdr->len);
                fill_xxhash(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;
        case VERIFY_SHA1:
                dprint(FD_VERIFY, "fill sha1 io_u %p, len %u\n",
                                                io_u, hdr->len);
                fill_sha1(hdr, data, data_len);
                break;
+       case VERIFY_HDR_ONLY:
        case VERIFY_PATTERN:
+       case VERIFY_PATTERN_NO_HDR:
                /* nothing to do here */
                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));
+
+       if (td->o.verify_offset && hdr_size(td, hdr))
+               memswp(p, p + td->o.verify_offset, hdr_size(td, hdr));
 }
 
 /*
@@ -1070,7 +1305,7 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
                return 0;
 
        if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
-               struct rb_node *n = rb_first(&td->io_hist_tree);
+               struct fio_rb_node *n = rb_first(&td->io_hist_tree);
 
                ipo = rb_entry(n, struct io_piece, rb_node);
 
@@ -1106,10 +1341,10 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
                io_u->buflen = ipo->len;
                io_u->numberio = ipo->numberio;
                io_u->file = ipo->file;
-               io_u->flags |= IO_U_F_VER_LIST;
+               io_u_set(td, io_u, IO_U_F_VER_LIST);
 
                if (ipo->flags & IP_F_TRIMMED)
-                       io_u->flags |= IO_U_F_TRIMMED;
+                       io_u_set(td, io_u, IO_U_F_TRIMMED);
 
                if (!fio_file_open(io_u->file)) {
                        int r = td_io_open_file(td, io_u->file);
@@ -1132,9 +1367,9 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
                dprint(FD_VERIFY, "get_next_verify: ret io_u %p\n", io_u);
 
                if (!td->o.verify_pattern_bytes) {
-                       io_u->rand_seed = __rand(&td->__verify_state);
+                       io_u->rand_seed = __rand(&td->verify_state);
                        if (sizeof(int) != sizeof(long *))
-                               io_u->rand_seed *= __rand(&td->__verify_state);
+                               io_u->rand_seed *= __rand(&td->verify_state);
                }
                return 0;
        }
@@ -1148,6 +1383,7 @@ void fio_verify_init(struct thread_data *td)
 {
        if (td->o.verify == VERIFY_CRC32C_INTEL ||
            td->o.verify == VERIFY_CRC32C) {
+               crc32c_arm64_probe();
                crc32c_intel_probe();
        }
 }
@@ -1158,7 +1394,7 @@ static void *verify_async_thread(void *data)
        struct io_u *io_u;
        int ret = 0;
 
-       if (td->o.verify_cpumask_set &&
+       if (fio_option_is_set(&td->o, verify_cpumask) &&
            fio_setaffinity(td->pid, td->o.verify_cpumask)) {
                log_err("fio: failed setting verify thread affinity\n");
                goto done;
@@ -1193,7 +1429,7 @@ static void *verify_async_thread(void *data)
                        io_u = flist_first_entry(&list, struct io_u, verify_list);
                        flist_del_init(&io_u->verify_list);
 
-                       io_u->flags |= IO_U_F_NO_FILE_PUT;
+                       io_u_set(td, io_u, IO_U_F_NO_FILE_PUT);
                        ret = verify_io_u(td, &io_u);
 
                        put_io_u(td, io_u);
@@ -1216,9 +1452,9 @@ static void *verify_async_thread(void *data)
 done:
        pthread_mutex_lock(&td->io_u_lock);
        td->nr_verify_threads--;
+       pthread_cond_signal(&td->free_cond);
        pthread_mutex_unlock(&td->io_u_lock);
 
-       pthread_cond_signal(&td->free_cond);
        return NULL;
 }
 
@@ -1228,7 +1464,7 @@ int verify_async_init(struct thread_data *td)
        pthread_attr_t attr;
 
        pthread_attr_init(&attr);
-       pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN);
+       pthread_attr_setstacksize(&attr, 2 * PTHREAD_STACK_MIN);
 
        td->verify_thread_exit = 0;
 
@@ -1254,9 +1490,12 @@ int verify_async_init(struct thread_data *td)
 
        if (i != td->o.verify_async) {
                log_err("fio: only %d verify threads started, exiting\n", i);
+
+               pthread_mutex_lock(&td->io_u_lock);
                td->verify_thread_exit = 1;
-               write_barrier();
                pthread_cond_broadcast(&td->verify_cond);
+               pthread_mutex_unlock(&td->io_u_lock);
+
                return 1;
        }
 
@@ -1265,12 +1504,10 @@ int verify_async_init(struct thread_data *td)
 
 void verify_async_exit(struct thread_data *td)
 {
+       pthread_mutex_lock(&td->io_u_lock);
        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);
 
@@ -1278,3 +1515,368 @@ void verify_async_exit(struct thread_data *td)
        free(td->verify_threads);
        td->verify_threads = NULL;
 }
+
+int paste_blockoff(char *buf, unsigned int len, void *priv)
+{
+       struct io_u *io = priv;
+       unsigned long long off;
+
+       typecheck(__typeof__(off), io->offset);
+       off = cpu_to_le64((uint64_t)io->offset);
+       len = min(len, (unsigned int)sizeof(off));
+       memcpy(buf, &off, len);
+       return 0;
+}
+
+static int __fill_file_completions(struct thread_data *td,
+                                  struct thread_io_list *s,
+                                  struct fio_file *f, unsigned int *index)
+{
+       unsigned int comps;
+       int i, j;
+
+       if (!f->last_write_comp)
+               return 0;
+
+       if (td->io_blocks[DDIR_WRITE] < td->o.iodepth)
+               comps = td->io_blocks[DDIR_WRITE];
+       else
+               comps = td->o.iodepth;
+
+       j = f->last_write_idx - 1;
+       for (i = 0; i < comps; i++) {
+               if (j == -1)
+                       j = td->o.iodepth - 1;
+               s->comps[*index].fileno = __cpu_to_le64(f->fileno);
+               s->comps[*index].offset = cpu_to_le64(f->last_write_comp[j]);
+               (*index)++;
+               j--;
+       }
+
+       return comps;
+}
+
+static int fill_file_completions(struct thread_data *td,
+                                struct thread_io_list *s, unsigned int *index)
+{
+       struct fio_file *f;
+       unsigned int i;
+       int comps = 0;
+
+       for_each_file(td, f, i)
+               comps += __fill_file_completions(td, s, f, index);
+
+       return comps;
+}
+
+struct all_io_list *get_all_io_list(int save_mask, size_t *sz)
+{
+       struct all_io_list *rep;
+       struct thread_data *td;
+       size_t depth;
+       void *next;
+       int i, nr;
+
+       compiletime_assert(sizeof(struct all_io_list) == 8, "all_io_list");
+
+       /*
+        * Calculate reply space needed. We need one 'io_state' per thread,
+        * and the size will vary depending on depth.
+        */
+       depth = 0;
+       nr = 0;
+       for_each_td(td, i) {
+               if (save_mask != IO_LIST_ALL && (i + 1) != save_mask)
+                       continue;
+               td->stop_io = 1;
+               td->flags |= TD_F_VSTATE_SAVED;
+               depth += (td->o.iodepth * td->o.nr_files);
+               nr++;
+       }
+
+       if (!nr)
+               return NULL;
+
+       *sz = sizeof(*rep);
+       *sz += nr * sizeof(struct thread_io_list);
+       *sz += depth * sizeof(struct file_comp);
+       rep = malloc(*sz);
+       memset(rep, 0, *sz);
+
+       rep->threads = cpu_to_le64((uint64_t) nr);
+
+       next = &rep->state[0];
+       for_each_td(td, i) {
+               struct thread_io_list *s = next;
+               unsigned int comps, index = 0;
+
+               if (save_mask != IO_LIST_ALL && (i + 1) != save_mask)
+                       continue;
+
+               comps = fill_file_completions(td, s, &index);
+
+               s->no_comps = cpu_to_le64((uint64_t) comps);
+               s->depth = cpu_to_le64((uint64_t) td->o.iodepth);
+               s->nofiles = cpu_to_le64((uint64_t) td->o.nr_files);
+               s->numberio = cpu_to_le64((uint64_t) td->io_issues[DDIR_WRITE]);
+               s->index = cpu_to_le64((uint64_t) i);
+               if (td->random_state.use64) {
+                       s->rand.state64.s[0] = cpu_to_le64(td->random_state.state64.s1);
+                       s->rand.state64.s[1] = cpu_to_le64(td->random_state.state64.s2);
+                       s->rand.state64.s[2] = cpu_to_le64(td->random_state.state64.s3);
+                       s->rand.state64.s[3] = cpu_to_le64(td->random_state.state64.s4);
+                       s->rand.state64.s[4] = cpu_to_le64(td->random_state.state64.s5);
+                       s->rand.state64.s[5] = 0;
+                       s->rand.use64 = cpu_to_le64((uint64_t)1);
+               } else {
+                       s->rand.state32.s[0] = cpu_to_le32(td->random_state.state32.s1);
+                       s->rand.state32.s[1] = cpu_to_le32(td->random_state.state32.s2);
+                       s->rand.state32.s[2] = cpu_to_le32(td->random_state.state32.s3);
+                       s->rand.state32.s[3] = 0;
+                       s->rand.use64 = 0;
+               }
+               s->name[sizeof(s->name) - 1] = '\0';
+               strncpy((char *) s->name, td->o.name, sizeof(s->name) - 1);
+               next = io_list_next(s);
+       }
+
+       return rep;
+}
+
+static int open_state_file(const char *name, const char *prefix, int num,
+                          int for_write)
+{
+       char out[PATH_MAX];
+       int flags;
+       int fd;
+
+       if (for_write)
+               flags = O_CREAT | O_TRUNC | O_WRONLY | O_SYNC;
+       else
+               flags = O_RDONLY;
+
+       verify_state_gen_name(out, sizeof(out), name, prefix, num);
+
+       fd = open(out, flags, 0644);
+       if (fd == -1) {
+               perror("fio: open state file");
+               log_err("fio: state file: %s (for_write=%d)\n", out, for_write);
+               return -1;
+       }
+
+       return fd;
+}
+
+static int write_thread_list_state(struct thread_io_list *s,
+                                  const char *prefix)
+{
+       struct verify_state_hdr hdr;
+       uint64_t crc;
+       ssize_t ret;
+       int fd;
+
+       fd = open_state_file((const char *) s->name, prefix, s->index, 1);
+       if (fd == -1)
+               return 1;
+
+       crc = fio_crc32c((void *)s, thread_io_list_sz(s));
+
+       hdr.version = cpu_to_le64((uint64_t) VSTATE_HDR_VERSION);
+       hdr.size = cpu_to_le64((uint64_t) thread_io_list_sz(s));
+       hdr.crc = cpu_to_le64(crc);
+       ret = write(fd, &hdr, sizeof(hdr));
+       if (ret != sizeof(hdr))
+               goto write_fail;
+
+       ret = write(fd, s, thread_io_list_sz(s));
+       if (ret != thread_io_list_sz(s)) {
+write_fail:
+               if (ret < 0)
+                       perror("fio: write state file");
+               log_err("fio: failed to write state file\n");
+               ret = 1;
+       } else
+               ret = 0;
+
+       close(fd);
+       return ret;
+}
+
+void __verify_save_state(struct all_io_list *state, const char *prefix)
+{
+       struct thread_io_list *s = &state->state[0];
+       unsigned int i;
+
+       for (i = 0; i < le64_to_cpu(state->threads); i++) {
+               write_thread_list_state(s,  prefix);
+               s = io_list_next(s);
+       }
+}
+
+void verify_save_state(int mask)
+{
+       struct all_io_list *state;
+       size_t sz;
+
+       state = get_all_io_list(mask, &sz);
+       if (state) {
+               char prefix[PATH_MAX];
+
+               if (aux_path)
+                       sprintf(prefix, "%s%clocal", aux_path, FIO_OS_PATH_SEPARATOR);
+               else
+                       strcpy(prefix, "local");
+
+               __verify_save_state(state, prefix);
+               free(state);
+       }
+}
+
+void verify_free_state(struct thread_data *td)
+{
+       if (td->vstate)
+               free(td->vstate);
+}
+
+void verify_assign_state(struct thread_data *td, void *p)
+{
+       struct thread_io_list *s = p;
+       int i;
+
+       s->no_comps = le64_to_cpu(s->no_comps);
+       s->depth = le32_to_cpu(s->depth);
+       s->nofiles = le32_to_cpu(s->nofiles);
+       s->numberio = le64_to_cpu(s->numberio);
+       s->rand.use64 = le64_to_cpu(s->rand.use64);
+
+       if (s->rand.use64) {
+               for (i = 0; i < 6; i++)
+                       s->rand.state64.s[i] = le64_to_cpu(s->rand.state64.s[i]);
+       } else {
+               for (i = 0; i < 4; i++)
+                       s->rand.state32.s[i] = le32_to_cpu(s->rand.state32.s[i]);
+       }
+
+       for (i = 0; i < s->no_comps; i++) {
+               s->comps[i].fileno = le64_to_cpu(s->comps[i].fileno);
+               s->comps[i].offset = le64_to_cpu(s->comps[i].offset);
+       }
+
+       td->vstate = p;
+}
+
+int verify_state_hdr(struct verify_state_hdr *hdr, struct thread_io_list *s)
+{
+       uint64_t crc;
+
+       hdr->version = le64_to_cpu(hdr->version);
+       hdr->size = le64_to_cpu(hdr->size);
+       hdr->crc = le64_to_cpu(hdr->crc);
+
+       if (hdr->version != VSTATE_HDR_VERSION)
+               return 1;
+
+       crc = fio_crc32c((void *)s, hdr->size);
+       if (crc != hdr->crc)
+               return 1;
+
+       return 0;
+}
+
+int verify_load_state(struct thread_data *td, const char *prefix)
+{
+       struct verify_state_hdr hdr;
+       void *s = NULL;
+       uint64_t crc;
+       ssize_t ret;
+       int fd;
+
+       if (!td->o.verify_state)
+               return 0;
+
+       fd = open_state_file(td->o.name, prefix, td->thread_number - 1, 0);
+       if (fd == -1)
+               return 1;
+
+       ret = read(fd, &hdr, sizeof(hdr));
+       if (ret != sizeof(hdr)) {
+               if (ret < 0)
+                       td_verror(td, errno, "read verify state hdr");
+               log_err("fio: failed reading verify state header\n");
+               goto err;
+       }
+
+       hdr.version = le64_to_cpu(hdr.version);
+       hdr.size = le64_to_cpu(hdr.size);
+       hdr.crc = le64_to_cpu(hdr.crc);
+
+       if (hdr.version != VSTATE_HDR_VERSION) {
+               log_err("fio: unsupported (%d) version in verify state header\n",
+                               (unsigned int) hdr.version);
+               goto err;
+       }
+
+       s = malloc(hdr.size);
+       ret = read(fd, s, hdr.size);
+       if (ret != hdr.size) {
+               if (ret < 0)
+                       td_verror(td, errno, "read verify state");
+               log_err("fio: failed reading verity state\n");
+               goto err;
+       }
+
+       crc = fio_crc32c(s, hdr.size);
+       if (crc != hdr.crc) {
+               log_err("fio: verify state is corrupt\n");
+               goto err;
+       }
+
+       close(fd);
+
+       verify_assign_state(td, s);
+       return 0;
+err:
+       if (s)
+               free(s);
+       close(fd);
+       return 1;
+}
+
+/*
+ * Use the loaded verify state to know when to stop doing verification
+ */
+int verify_state_should_stop(struct thread_data *td, struct io_u *io_u)
+{
+       struct thread_io_list *s = td->vstate;
+       struct fio_file *f = io_u->file;
+       int i;
+
+       if (!s || !f)
+               return 0;
+
+       /*
+        * If we're not into the window of issues - depth yet, continue. If
+        * issue is shorter than depth, do check.
+        */
+       if ((td->io_blocks[DDIR_READ] < s->depth ||
+           s->numberio - td->io_blocks[DDIR_READ] > s->depth) &&
+           s->numberio > s->depth)
+               return 0;
+
+       /*
+        * We're in the window of having to check if this io was
+        * completed or not. If the IO was seen as completed, then
+        * lets verify it.
+        */
+       for (i = 0; i < s->no_comps; i++) {
+               if (s->comps[i].fileno != f->fileno)
+                       continue;
+               if (io_u->offset == s->comps[i].offset)
+                       return 0;
+       }
+
+       /*
+        * Not found, we have to stop
+        */
+       return 1;
+}