blkparse_fmt.c

   1 /*
   2  * This file contains format parsing code for blkparse, allowing you to
   3  * customize the individual action format and generel output format.
   4  */
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <ctype.h>
  10
  11 #include "blktrace.h"
  12
  13 #define VALID_SPECS     "ABCDFGMPQRSTUWX"
  14
  15 #define HEADER          "%D %2c %8s %5T.%9t %5p %2a %3d "
  16
  17 static char *override_format[256];
  18
  19 static inline int valid_spec(int spec)
  20 {
  21         return strchr(VALID_SPECS, spec) != NULL;
  22 }
  23
  24 void set_all_format_specs(char *option)
  25 {
  26         char *p;
  27
  28         for (p = VALID_SPECS; *p; p++)
  29                 if (override_format[(int)(*p)] == NULL)
  30                         override_format[(int)(*p)] = strdup(option);
  31 }
  32
  33 int add_format_spec(char *option)
  34 {
  35         int spec = optarg[0];
  36
  37         if (!valid_spec(spec)) {
  38                 fprintf(stderr,"Bad format specifier %c\n", spec);
  39                 return 1;
  40         }
  41         if (optarg[1] != ',') {
  42                 fprintf(stderr,"Bad format specifier - need ',' %s\n", option);
  43                 return 1;
  44         }
  45         option += 2;
  46         if (*option == '\0') {
  47                 fprintf(stderr,"Bad format specifier - need fmt %s\n", option);
  48                 return 1;
  49         }
  50
  51         /*
  52          * Set both merges (front and back)
  53          */
  54         if (spec == 'M') {
  55                 override_format['B'] = strdup(option);
  56                 override_format['M'] = strdup(option);
  57         } else
  58                 override_format[spec] = strdup(option);
  59
  60         return 0;
  61 }
  62
  63 static inline void fill_rwbs(char *rwbs, struct blk_io_trace *t)
  64 {
  65         int w = t->action & BLK_TC_ACT(BLK_TC_WRITE);
  66         int b = t->action & BLK_TC_ACT(BLK_TC_BARRIER);
  67         int s = t->action & BLK_TC_ACT(BLK_TC_SYNC);
  68         int i = 0;
  69
  70         if (w)
  71                 rwbs[i++] = 'W';
  72         else
  73                 rwbs[i++] = 'R';
  74         if (b)
  75                 rwbs[i++] = 'B';
  76         if (s)
  77                 rwbs[i++] = 'S';
  78
  79         rwbs[i] = '\0';
  80 }
  81
  82 static char *dump_pdu(unsigned char *pdu_buf, int pdu_len)
  83 {
  84         static char p[4096];
  85         int i, len;
  86
  87         if (!pdu_buf || !pdu_len)
  88                 return NULL;
  89
  90         for (len = 0, i = 0; i < pdu_len; i++) {
  91                 if (i)
  92                         len += sprintf(p + len, " ");
  93
  94                 len += sprintf(p + len, "%02x", pdu_buf[i]);
  95         }
  96
  97         return p;
  98 }
  99
 100 #define pdu_start(t)    (((void *) (t) + sizeof(struct blk_io_trace)))
 101
 102 static unsigned int get_pdu_int(struct blk_io_trace *t)
 103 {
 104         __u64 *val = pdu_start(t);
 105
 106         return be64_to_cpu(*val);
 107 }
 108
 109 static void get_pdu_remap(struct blk_io_trace *t, struct blk_io_trace_remap *r)
 110 {
 111         struct blk_io_trace_remap *__r = pdu_start(t);
 112
 113         r->device = be32_to_cpu(__r->device);
 114         r->sector = be64_to_cpu(__r->sector);
 115 }
 116
 117 static void print_field(char *act, struct per_cpu_info *pci,
 118                         struct blk_io_trace *t, unsigned long long elapsed,
 119                         int pdu_len, unsigned char *pdu_buf, char field,
 120                         int minus, int has_w, int width)
 121 {
 122         char format[64];
 123
 124         if (has_w) {
 125                 if (minus)
 126                         sprintf(format, "%%-%d", width);
 127                 else
 128                         sprintf(format, "%%%d", width);
 129         } else
 130                 sprintf(format, "%%");
 131
 132         switch (field) {
 133         case 'a':
 134                 fprintf(ofp, strcat(format, "s"), act);
 135                 break;
 136         case 'c':
 137                 fprintf(ofp, strcat(format, "d"), pci->cpu);
 138                 break;
 139         case 'C':
 140                 fprintf(ofp, strcat(format, "s"), t->comm);
 141                 break;
 142         case 'd': {
 143                 char rwbs[4];
 144
 145                 fill_rwbs(rwbs, t);
 146                 fprintf(ofp, strcat(format, "s"), rwbs);
 147                 break;
 148         }
 149         case 'D':       /* format width ignored */
 150                 fprintf(ofp,"%3d,%-3d", MAJOR(t->device), MINOR(t->device));
 151                 break;
 152         case 'e':
 153                 fprintf(ofp, strcat(format, "d"), t->error);
 154                 break;
 155         case 'M':
 156                 fprintf(ofp, strcat(format, "d"), MAJOR(t->device));
 157                 break;
 158         case 'm':
 159                 fprintf(ofp, strcat(format, "d"), MINOR(t->device));
 160                 break;
 161         case 'n':
 162                 fprintf(ofp, strcat(format, "u"), t->bytes >> 9);
 163                 break;
 164         case 'N':
 165                 fprintf(ofp, strcat(format, "u"), t->bytes);
 166                 break;
 167         case 'p':
 168                 fprintf(ofp, strcat(format, "u"), t->pid);
 169                 break;
 170         case 'P': { /* format width ignored */
 171                 char *p = dump_pdu(pdu_buf, pdu_len);
 172                 if (p)
 173                         fprintf(ofp, "%s", p);
 174                 break;
 175         }
 176         case 's':
 177                 fprintf(ofp, strcat(format, "ld"), t->sequence);
 178                 break;
 179         case 'S':
 180                 fprintf(ofp, strcat(format, "lu"), t->sector);
 181                 break;
 182         case 't':
 183                 sprintf(format, "%%0%dlu", has_w ? width : 9);
 184                 fprintf(ofp, format, NANO_SECONDS(t->time));
 185                 break;
 186         case 'T':
 187                 fprintf(ofp, strcat(format, "d"), SECONDS(t->time));
 188                 break;
 189         case 'u':
 190                 if (elapsed == -1ULL) {
 191                         fprintf(stderr, "Expecting elapsed value\n");
 192                         exit(1);
 193                 }
 194                 fprintf(ofp, strcat(format, "llu"), elapsed / 1000);
 195                 break;
 196         case 'U': {
 197                 fprintf(ofp, strcat(format, "u"), get_pdu_int(t));
 198                 break;
 199         }
 200         default:
 201                 fprintf(ofp,strcat(format, "c"), field);
 202                 break;
 203         }
 204 }
 205
 206 static char *parse_field(char *act, struct per_cpu_info *pci,
 207                          struct blk_io_trace *t, unsigned long long elapsed,
 208                          int pdu_len, unsigned char *pdu_buf,
 209                          char *master_format)
 210 {
 211         int minus = 0;
 212         int has_w = 0;
 213         int width = 0;
 214         char *p = master_format;
 215
 216         if (*p == '-') {
 217                 minus = 1;
 218                 p++;
 219         }
 220         if (isdigit(*p)) {
 221                 has_w = 1;
 222                 do {
 223                         width = (width * 10) + (*p++ - '0');
 224                 } while ((*p) && (isdigit(*p)));
 225         }
 226         if (*p) {
 227                 print_field(act, pci, t, elapsed, pdu_len, pdu_buf, *p++,
 228                             minus, has_w, width);
 229         }
 230         return p;
 231 }
 232
 233 static void process_default(char *act, struct per_cpu_info *pci,
 234                             struct blk_io_trace *t, unsigned long long elapsed,
 235                             int pdu_len, unsigned char *pdu_buf)
 236 {
 237         char rwbs[4];
 238
 239         fill_rwbs(rwbs, t);
 240
 241         /*
 242          * The header is always the same
 243          */
 244         fprintf(ofp, "%3d,%-3d %2d %8d %5d.%09lu %5u %2s %3s ",
 245                 MAJOR(t->device), MINOR(t->device), pci->cpu, t->sequence,
 246                 (int) SECONDS(t->time), (unsigned long) NANO_SECONDS(t->time),
 247                 t->pid, act, rwbs);
 248
 249         switch (act[0]) {
 250         case 'C':       /* Complete */
 251                 if (t->action & BLK_TC_ACT(BLK_TC_PC)) {
 252                         char *p = dump_pdu(pdu_buf, pdu_len);
 253                         if (p)
 254                                 fprintf(ofp, "(%s) ", p);
 255                         fprintf(ofp, "[%d]\n", t->error);
 256                 } else {
 257                         if (elapsed != -1ULL) {
 258                                 fprintf(ofp, "%llu + %u (%8llu) [%d]\n",
 259                                         (unsigned long long) t->sector,
 260                                         t->bytes >> 9, elapsed, t->error);
 261                         } else {
 262                                 fprintf(ofp, "%llu + %u [%d]\n",
 263                                         (unsigned long long) t->sector,
 264                                         t->bytes >> 9, t->error);
 265                         }
 266                 }
 267                 break;
 268
 269         case 'D':       /* Issue */
 270         case 'I':       /* Insert */
 271         case 'Q':       /* Queue */
 272         case 'W':       /* Bounce */
 273                 if (t->action & BLK_TC_ACT(BLK_TC_PC)) {
 274                         char *p;
 275                         fprintf(ofp, "%u ", t->bytes);
 276                         p = dump_pdu(pdu_buf, pdu_len);
 277                         if (p)
 278                                 fprintf(ofp, "(%s) ", p);
 279                         fprintf(ofp, "[%s]\n", t->comm);
 280                 } else {
 281                         if (elapsed != -1ULL) {
 282                                 fprintf(ofp, "%llu + %u (%8llu) [%s]\n",
 283                                         (unsigned long long) t->sector,
 284                                         t->bytes >> 9, elapsed, t->comm);
 285                         } else {
 286                                 fprintf(ofp, "%llu + %u [%s]\n",
 287                                         (unsigned long long) t->sector,
 288                                         t->bytes >> 9, t->comm);
 289                         }
 290                 }
 291                 break;
 292
 293         case 'B':       /* Back merge */
 294         case 'F':       /* Front merge */
 295         case 'M':       /* Front or back merge */
 296         case 'G':       /* Get request */
 297         case 'S':       /* Sleep request */
 298                 fprintf(ofp, "%llu + %u [%s]\n", (unsigned long long) t->sector,
 299                         t->bytes >> 9, t->comm);
 300                 break;
 301
 302         case 'P':       /* Plug */
 303                 fprintf(ofp, "[%s]\n", t->comm);
 304                 break;
 305
 306         case 'U':       /* Unplug IO */
 307         case 'T':       /* Unplug timer */
 308                 fprintf(ofp, "[%s] %u\n", t->comm, get_pdu_int(t));
 309                 break;
 310
 311         case 'A': {     /* remap */
 312                 struct blk_io_trace_remap r;
 313
 314                 get_pdu_remap(t, &r);
 315                 fprintf(ofp, "%llu + %u <- (%d,%d) %llu\n",
 316                         (unsigned long long) r.sector, t->bytes >> 10,
 317                         MAJOR(r.device), MINOR(r.device),
 318                         (unsigned long long) t->sector);
 319                 break;
 320         }
 321
 322         case 'X':       /* Split */
 323                 fprintf(ofp, "%llu / %u [%s]\n", (unsigned long long) t->sector,
 324                         get_pdu_int(t), t->comm);
 325                 break;
 326
 327         default:
 328                 fprintf(stderr, "Unknown action %c\n", act[0]);
 329                 break;
 330         }
 331
 332 }
 333
 334 void process_fmt(char *act, struct per_cpu_info *pci, struct blk_io_trace *t,
 335                  unsigned long long elapsed, int pdu_len,
 336                  unsigned char *pdu_buf)
 337 {
 338         char *p = override_format[(int) *act];
 339
 340         if (!p) {
 341                 process_default(act, pci, t, elapsed, pdu_len, pdu_buf);
 342                 return;
 343         }
 344
 345         while (*p) {
 346                 switch (*p) {
 347                 case '%':       /* Field specifier */
 348                         p++;
 349                         if (*p == '%')
 350                                 fprintf(ofp, "%c", *p++);
 351                         else if (!*p)
 352                                 fprintf(ofp, "%c", '%');
 353                         else
 354                                 p = parse_field(act, pci, t, elapsed,
 355                                                 pdu_len, pdu_buf, p);
 356                         break;
 357                 case '\\': {    /* escape */
 358                         switch (p[1]) {
 359                         case 'b': fprintf(ofp, "\b"); break;
 360                         case 'n': fprintf(ofp, "\n"); break;
 361                         case 'r': fprintf(ofp, "\r"); break;
 362                         case 't': fprintf(ofp, "\t"); break;
 363                         default:
 364                                 fprintf(stderr,
 365                                         "Invalid escape char in format %c\n",
 366                                         p[1]);
 367                                 exit(1);
 368                                 /*NOTREACHED*/
 369                         }
 370                         p += 2;
 371                         break;
 372                 }
 373                 default:
 374                         fprintf(ofp, "%c", *p++);
 375                         break;
 376                 }
 377         }
 378 }
 379
 380