2 * IO verification helpers
11 static void fill_random_bytes(struct thread_data *td,
12 unsigned char *p, unsigned int len)
18 r = os_random_double(&td->verify_state);
21 * lrand48_r seems to be broken and only fill the bottom
22 * 32-bits, even on 64-bit archs with 64-bit longs
35 static void hexdump(void *buffer, int len)
37 unsigned char *p = buffer;
40 for (i = 0; i < len; i++)
41 log_info("%02x", p[i]);
45 static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u)
47 unsigned char *p = (unsigned char *) io_u->buf;
51 c = crc32(p, hdr->len - sizeof(*hdr));
53 if (c != hdr->crc32) {
54 log_err("crc32: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen);
55 log_err("crc32: wanted %lx, got %lx\n", hdr->crc32, c);
62 static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u)
64 unsigned char *p = (unsigned char *) io_u->buf;
65 struct md5_ctx md5_ctx;
67 memset(&md5_ctx, 0, sizeof(md5_ctx));
69 md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr));
71 if (memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash))) {
72 log_err("md5: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen);
73 hexdump(hdr->md5_digest, sizeof(hdr->md5_digest));
74 hexdump(md5_ctx.hash, sizeof(md5_ctx.hash));
81 int verify_io_u(struct thread_data *td, struct io_u *io_u)
83 struct verify_header *hdr = (struct verify_header *) io_u->buf;
86 if (td->o.verify == VERIFY_NULL)
89 if (hdr->fio_magic != FIO_HDR_MAGIC) {
90 log_err("Bad verify header %x\n", hdr->fio_magic);
94 if (hdr->verify_type == VERIFY_MD5)
95 ret = verify_io_u_md5(hdr, io_u);
96 else if (hdr->verify_type == VERIFY_CRC32)
97 ret = verify_io_u_crc32(hdr, io_u);
99 log_err("Bad verify type %u\n", hdr->verify_type);
109 static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
111 hdr->crc32 = crc32(p, len);
114 static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
116 struct md5_ctx md5_ctx;
118 memset(&md5_ctx, 0, sizeof(md5_ctx));
119 md5_update(&md5_ctx, p, len);
120 memcpy(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash));
124 * fill body of io_u->buf with random data and add a header with the
125 * crc32 or md5 sum of that data.
127 void populate_verify_io_u(struct thread_data *td, struct io_u *io_u)
129 unsigned char *p = (unsigned char *) io_u->buf;
130 struct verify_header hdr;
132 if (td->o.verify == VERIFY_NULL)
135 hdr.fio_magic = FIO_HDR_MAGIC;
136 hdr.len = io_u->buflen;
138 fill_random_bytes(td, p, io_u->buflen - sizeof(hdr));
140 if (td->o.verify == VERIFY_MD5) {
141 fill_md5(&hdr, p, io_u->buflen - sizeof(hdr));
142 hdr.verify_type = VERIFY_MD5;
143 } else if (td->o.verify == VERIFY_CRC32) {
144 fill_crc32(&hdr, p, io_u->buflen - sizeof(hdr));
145 hdr.verify_type = VERIFY_CRC32;
148 memcpy(io_u->buf, &hdr, sizeof(hdr));
151 int get_next_verify(struct thread_data *td, struct io_u *io_u)
153 struct io_piece *ipo = NULL;
156 * this io_u is from a requeue, we already filled the offsets
161 if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
162 struct rb_node *n = rb_first(&td->io_hist_tree);
164 ipo = rb_entry(n, struct io_piece, rb_node);
165 rb_erase(n, &td->io_hist_tree);
166 } else if (!list_empty(&td->io_hist_list)) {
167 ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
168 list_del(&ipo->list);
172 io_u->offset = ipo->offset;
173 io_u->buflen = ipo->len;
174 io_u->file = ipo->file;
175 io_u->ddir = DDIR_READ;
176 io_u->xfer_buf = io_u->buf;
177 io_u->xfer_buflen = io_u->buflen;