| 1 | /* |
| 2 | * IO verification helpers |
| 3 | */ |
| 4 | #include <unistd.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <string.h> |
| 7 | |
| 8 | #include "fio.h" |
| 9 | |
| 10 | static void fill_random_bytes(struct thread_data *td, |
| 11 | unsigned char *p, unsigned int len) |
| 12 | { |
| 13 | unsigned int todo; |
| 14 | double r; |
| 15 | |
| 16 | while (len) { |
| 17 | r = os_random_double(&td->verify_state); |
| 18 | |
| 19 | /* |
| 20 | * lrand48_r seems to be broken and only fill the bottom |
| 21 | * 32-bits, even on 64-bit archs with 64-bit longs |
| 22 | */ |
| 23 | todo = sizeof(r); |
| 24 | if (todo > len) |
| 25 | todo = len; |
| 26 | |
| 27 | memcpy(p, &r, todo); |
| 28 | |
| 29 | len -= todo; |
| 30 | p += todo; |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | static void hexdump(void *buffer, int len) |
| 35 | { |
| 36 | unsigned char *p = buffer; |
| 37 | int i; |
| 38 | |
| 39 | for (i = 0; i < len; i++) |
| 40 | log_info("%02x", p[i]); |
| 41 | log_info("\n"); |
| 42 | } |
| 43 | |
| 44 | static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u) |
| 45 | { |
| 46 | unsigned char *p = (unsigned char *) io_u->buf; |
| 47 | unsigned long c; |
| 48 | |
| 49 | p += sizeof(*hdr); |
| 50 | c = crc32(p, hdr->len - sizeof(*hdr)); |
| 51 | |
| 52 | if (c != hdr->crc32) { |
| 53 | log_err("crc32: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen); |
| 54 | log_err("crc32: wanted %lx, got %lx\n", hdr->crc32, c); |
| 55 | return 1; |
| 56 | } |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u) |
| 62 | { |
| 63 | unsigned char *p = (unsigned char *) io_u->buf; |
| 64 | struct md5_ctx md5_ctx; |
| 65 | |
| 66 | memset(&md5_ctx, 0, sizeof(md5_ctx)); |
| 67 | p += sizeof(*hdr); |
| 68 | md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr)); |
| 69 | |
| 70 | if (memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash))) { |
| 71 | log_err("md5: verify failed at %llu/%lu\n", io_u->offset, io_u->buflen); |
| 72 | hexdump(hdr->md5_digest, sizeof(hdr->md5_digest)); |
| 73 | hexdump(md5_ctx.hash, sizeof(md5_ctx.hash)); |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | int verify_io_u(struct thread_data *td, struct io_u *io_u) |
| 81 | { |
| 82 | struct verify_header *hdr = (struct verify_header *) io_u->buf; |
| 83 | int ret; |
| 84 | |
| 85 | if (td->o.verify == VERIFY_NULL) |
| 86 | return 0; |
| 87 | |
| 88 | if (hdr->fio_magic != FIO_HDR_MAGIC) { |
| 89 | log_err("Bad verify header %x\n", hdr->fio_magic); |
| 90 | return EIO; |
| 91 | } |
| 92 | |
| 93 | if (hdr->verify_type == VERIFY_MD5) |
| 94 | ret = verify_io_u_md5(hdr, io_u); |
| 95 | else if (hdr->verify_type == VERIFY_CRC32) |
| 96 | ret = verify_io_u_crc32(hdr, io_u); |
| 97 | else { |
| 98 | log_err("Bad verify type %u\n", hdr->verify_type); |
| 99 | ret = 1; |
| 100 | } |
| 101 | |
| 102 | if (ret) |
| 103 | return EIO; |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len) |
| 109 | { |
| 110 | hdr->crc32 = crc32(p, len); |
| 111 | } |
| 112 | |
| 113 | static void fill_md5(struct verify_header *hdr, void *p, unsigned int len) |
| 114 | { |
| 115 | struct md5_ctx md5_ctx; |
| 116 | |
| 117 | memset(&md5_ctx, 0, sizeof(md5_ctx)); |
| 118 | md5_update(&md5_ctx, p, len); |
| 119 | memcpy(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash)); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * fill body of io_u->buf with random data and add a header with the |
| 124 | * crc32 or md5 sum of that data. |
| 125 | */ |
| 126 | void populate_verify_io_u(struct thread_data *td, struct io_u *io_u) |
| 127 | { |
| 128 | unsigned char *p = (unsigned char *) io_u->buf; |
| 129 | struct verify_header hdr; |
| 130 | |
| 131 | if (td->o.verify == VERIFY_NULL) |
| 132 | return; |
| 133 | |
| 134 | hdr.fio_magic = FIO_HDR_MAGIC; |
| 135 | hdr.len = io_u->buflen; |
| 136 | p += sizeof(hdr); |
| 137 | fill_random_bytes(td, p, io_u->buflen - sizeof(hdr)); |
| 138 | |
| 139 | if (td->o.verify == VERIFY_MD5) { |
| 140 | fill_md5(&hdr, p, io_u->buflen - sizeof(hdr)); |
| 141 | hdr.verify_type = VERIFY_MD5; |
| 142 | } else if (td->o.verify == VERIFY_CRC32) { |
| 143 | fill_crc32(&hdr, p, io_u->buflen - sizeof(hdr)); |
| 144 | hdr.verify_type = VERIFY_CRC32; |
| 145 | } |
| 146 | |
| 147 | memcpy(io_u->buf, &hdr, sizeof(hdr)); |
| 148 | } |
| 149 | |
| 150 | int get_next_verify(struct thread_data *td, struct io_u *io_u) |
| 151 | { |
| 152 | struct io_piece *ipo = NULL; |
| 153 | |
| 154 | /* |
| 155 | * this io_u is from a requeue, we already filled the offsets |
| 156 | */ |
| 157 | if (io_u->file) |
| 158 | return 0; |
| 159 | |
| 160 | if (!RB_EMPTY_ROOT(&td->io_hist_tree)) { |
| 161 | struct rb_node *n = rb_first(&td->io_hist_tree); |
| 162 | |
| 163 | ipo = rb_entry(n, struct io_piece, rb_node); |
| 164 | rb_erase(n, &td->io_hist_tree); |
| 165 | } else if (!list_empty(&td->io_hist_list)) { |
| 166 | ipo = list_entry(td->io_hist_list.next, struct io_piece, list); |
| 167 | list_del(&ipo->list); |
| 168 | } |
| 169 | |
| 170 | if (ipo) { |
| 171 | io_u->offset = ipo->offset; |
| 172 | io_u->buflen = ipo->len; |
| 173 | io_u->file = ipo->file; |
| 174 | io_u->ddir = DDIR_READ; |
| 175 | io_u->xfer_buf = io_u->buf; |
| 176 | io_u->xfer_buflen = io_u->buflen; |
| 177 | free(ipo); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | return 1; |
| 182 | } |