btrfs-fragments.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/ioctl.h>
  21 #include <sys/types.h>
  22 #include <dirent.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <libgen.h>
  27 #include <limits.h>
  28 #include <uuid/uuid.h>
  29 #include <ctype.h>
  30
  31 #include <gd.h>
  32
  33 #undef ULONG_MAX
  34
  35 #include "kerncompat.h"
  36 #include "ctree.h"
  37 #include "ioctl.h"
  38 #include "utils.h"
  39
  40 static int use_color;
  41 static void
  42 push_im(gdImagePtr im, char *name, char *dir)
  43 {
  44         char fullname[2000];
  45         FILE *pngout;
  46
  47         if (!im)
  48                 return;
  49
  50         snprintf(fullname, sizeof(fullname), "%s/%s", dir, name);
  51         pngout = fopen(fullname, "w");
  52         if (!pngout) {
  53                 printf("unable to create file %s\n", fullname);
  54                 exit(1);
  55         }
  56
  57         gdImagePng(im, pngout);
  58
  59         fclose(pngout);
  60         gdImageDestroy(im);
  61 }
  62
  63 static char *
  64 chunk_type(u64 flags)
  65 {
  66         switch (flags & (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_DATA |
  67                          BTRFS_BLOCK_GROUP_METADATA)) {
  68         case BTRFS_BLOCK_GROUP_SYSTEM:
  69                 return "system";
  70         case BTRFS_BLOCK_GROUP_DATA:
  71                 return "data";
  72         case BTRFS_BLOCK_GROUP_METADATA:
  73                 return "metadata";
  74         case BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA:
  75                 return "mixed";
  76         default:
  77                 return "invalid";
  78         }
  79 }
  80
  81 static void
  82 print_bg(FILE *html, char *name, u64 start, u64 len, u64 used, u64 flags,
  83          u64 areas)
  84 {
  85         double frag = (double)areas / (len / 4096) * 2;
  86
  87         fprintf(html, "<p>%s chunk starts at %lld, size is %s, %.2f%% used, "
  88                       "%.2f%% fragmented</p>\n", chunk_type(flags), start,
  89                       pretty_size(len), 100.0 * used / len, 100.0 * frag);
  90         fprintf(html, "<img src=\"%s\" border=\"1\" />\n", name);
  91 }
  92
  93 enum tree_colors {
  94         COLOR_ROOT = 0,
  95         COLOR_EXTENT,
  96         COLOR_CHUNK,
  97         COLOR_DEV,
  98         COLOR_FS,
  99         COLOR_CSUM,
 100         COLOR_RELOC,
 101         COLOR_DATA,
 102         COLOR_UNKNOWN,
 103         COLOR_MAX
 104 };
 105
 106 static int
 107 get_color(struct btrfs_extent_item *item, int len)
 108 {
 109         u64 refs;
 110         u64 flags;
 111         u8 type;
 112         u64 offset;
 113         struct btrfs_extent_inline_ref *ref;
 114
 115         refs = btrfs_stack_extent_refs(item);
 116         flags = btrfs_stack_extent_flags(item);
 117
 118         if (flags & BTRFS_EXTENT_FLAG_DATA)
 119                 return COLOR_DATA;
 120         if (refs > 1) {
 121                 /* this must be an fs tree */
 122                 return COLOR_FS;
 123         }
 124
 125         ref = (void *)item + sizeof(struct btrfs_extent_item) +
 126                              sizeof(struct btrfs_tree_block_info);
 127         type = btrfs_stack_extent_inline_ref_type(ref);
 128         offset = btrfs_stack_extent_inline_ref_offset(ref);
 129
 130         switch (type) {
 131         case BTRFS_EXTENT_DATA_REF_KEY:
 132                 return COLOR_DATA;
 133         case BTRFS_SHARED_BLOCK_REF_KEY:
 134         case BTRFS_SHARED_DATA_REF_KEY:
 135                 return COLOR_FS;
 136         case BTRFS_TREE_BLOCK_REF_KEY:
 137                 break;
 138         default:
 139                 return COLOR_UNKNOWN;
 140         }
 141
 142         switch (offset) {
 143         case BTRFS_ROOT_TREE_OBJECTID:
 144                 return COLOR_ROOT;
 145         case BTRFS_EXTENT_TREE_OBJECTID:
 146                 return COLOR_EXTENT;
 147         case BTRFS_CHUNK_TREE_OBJECTID:
 148                 return COLOR_CHUNK;
 149         case BTRFS_DEV_TREE_OBJECTID:
 150                 return COLOR_DEV;
 151         case BTRFS_FS_TREE_OBJECTID:
 152                 return COLOR_FS;
 153         case BTRFS_CSUM_TREE_OBJECTID:
 154                 return COLOR_CSUM;
 155         case BTRFS_DATA_RELOC_TREE_OBJECTID:
 156                 return COLOR_RELOC;
 157         }
 158
 159         return COLOR_UNKNOWN;
 160 }
 161
 162 static void
 163 init_colors(gdImagePtr im, int *colors)
 164 {
 165         colors[COLOR_ROOT] = gdImageColorAllocate(im, 255, 0, 0);
 166         colors[COLOR_EXTENT] = gdImageColorAllocate(im, 0, 255, 0);
 167         colors[COLOR_CHUNK] = gdImageColorAllocate(im, 255, 0, 0);
 168         colors[COLOR_DEV] = gdImageColorAllocate(im, 255, 0, 0);
 169         colors[COLOR_FS] = gdImageColorAllocate(im, 0, 0, 0);
 170         colors[COLOR_CSUM] = gdImageColorAllocate(im, 0, 0, 255);
 171         colors[COLOR_RELOC] = gdImageColorAllocate(im, 128, 128, 128);
 172         colors[COLOR_DATA] = gdImageColorAllocate(im, 100, 0, 0);
 173         colors[COLOR_UNKNOWN] = gdImageColorAllocate(im, 50, 50, 50);
 174 }
 175
 176 int
 177 list_fragments(int fd, u64 flags, char *dir)
 178 {
 179         int ret;
 180         struct btrfs_ioctl_search_args args;
 181         struct btrfs_ioctl_search_key *sk = &args.key;
 182         int i;
 183         struct btrfs_ioctl_search_header *sh;
 184         unsigned long off = 0;
 185         int bgnum = 0;
 186         u64 bgstart = 0;
 187         u64 bglen = 0;
 188         u64 bgend = 0;
 189         u64 bgflags = 0;
 190         u64 bgused = 0;
 191         u64 saved_extent = 0;
 192         u64 saved_len = 0;
 193         int saved_color = 0;
 194         u64 last_end = 0;
 195         u64 areas = 0;
 196         long px;
 197         char name[1000];
 198         FILE *html;
 199         int colors[COLOR_MAX];
 200
 201         gdImagePtr im = NULL;
 202         int black = 0;
 203         int width = 800;
 204
 205         snprintf(name, sizeof(name), "%s/index.html", dir);
 206         html = fopen(name, "w");
 207         if (!html) {
 208                 printf("unable to create %s\n", name);
 209                 exit(1);
 210         }
 211
 212         fprintf(html, "<html><header>\n");
 213         fprintf(html, "<title>Btrfs Block Group Allocation Map</title>\n");
 214         fprintf(html, "<style type=\"text/css\">\n");
 215         fprintf(html, "img {margin-left: 1em; margin-bottom: 2em;}\n");
 216         fprintf(html, "</style>\n");
 217         fprintf(html, "</header><body>\n");
 218
 219         memset(&args, 0, sizeof(args));
 220
 221         sk->tree_id = 2;
 222         sk->max_type = -1;
 223         sk->min_type = 0;
 224         sk->max_objectid = (u64)-1;
 225         sk->max_offset = (u64)-1;
 226         sk->max_transid = (u64)-1;
 227
 228         /* just a big number, doesn't matter much */
 229         sk->nr_items = 4096;
 230
 231         while(1) {
 232                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 233                 if (ret < 0) {
 234                         fprintf(stderr, "ERROR: can't perform the search\n");
 235                         goto out_close;
 236                 }
 237                 /* the ioctl returns the number of item it found in nr_items */
 238                 if (sk->nr_items == 0)
 239                         break;
 240
 241                 off = 0;
 242                 for (i = 0; i < sk->nr_items; i++) {
 243                         int j;
 244
 245                         sh = (struct btrfs_ioctl_search_header *)(args.buf +
 246                                                                   off);
 247                         off += sizeof(*sh);
 248                         if (sh->type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
 249                                 struct btrfs_block_group_item *bg;
 250
 251                                 if (im) {
 252                                         push_im(im, name, dir);
 253                                         im = NULL;
 254
 255                                         print_bg(html, name, bgstart, bglen,
 256                                                 bgused, bgflags, areas);
 257                                 }
 258
 259                                 ++bgnum;
 260
 261                                 bg = (struct btrfs_block_group_item *)
 262                                                 (args.buf + off);
 263                                 bgflags = btrfs_block_group_flags(bg);
 264                                 bgused = btrfs_block_group_used(bg);
 265
 266                                 printf("found block group %lld len %lld "
 267                                         "flags %lld\n", sh->objectid,
 268                                         sh->offset, bgflags);
 269                                 if (!(bgflags & flags)) {
 270                                         /* skip this block group */
 271                                         sk->min_objectid = sh->objectid +
 272                                                            sh->offset;
 273                                         sk->min_type = 0;
 274                                         sk->min_offset = 0;
 275                                         break;
 276                                 }
 277                                 im = gdImageCreate(width,
 278                                         (sh->offset / 4096 + 799) / width);
 279
 280                                 black = gdImageColorAllocate(im, 0, 0, 0);
 281
 282                                 for (j = 0; j < ARRAY_SIZE(colors); ++j)
 283                                         colors[j] = black;
 284
 285                                 init_colors(im, colors);
 286                                 bgstart = sh->objectid;
 287                                 bglen = sh->offset;
 288                                 bgend = bgstart + bglen;
 289
 290                                 snprintf(name, sizeof(name), "bg%d.png", bgnum);
 291
 292                                 last_end = bgstart;
 293                                 if (saved_len) {
 294                                         px = (saved_extent - bgstart) / 4096;
 295                                         for (j = 0; j < saved_len / 4096; ++j) {
 296                                                 int x = (px + j) % width;
 297                                                 int y = (px + j) / width;
 298                                                 gdImageSetPixel(im, x, y,
 299                                                                 saved_color);
 300                                         }
 301                                         last_end += saved_len;
 302                                 }
 303                                 areas = 0;
 304                                 saved_len = 0;
 305                         }
 306                         if (im && sh->type == BTRFS_EXTENT_ITEM_KEY) {
 307                                 int c;
 308                                 struct btrfs_extent_item *item;
 309
 310                                 item = (struct btrfs_extent_item *)
 311                                                 (args.buf + off);
 312
 313                                 if (use_color)
 314                                         c = colors[get_color(item, sh->len)];
 315                                 else
 316                                         c = black;
 317                                 if (sh->objectid > bgend) {
 318                                         printf("WARN: extent %lld is without "
 319                                                 "block group\n", sh->objectid);
 320                                         goto skip;
 321                                 }
 322                                 if (sh->objectid == bgend) {
 323                                         saved_extent = sh->objectid;
 324                                         saved_len = sh->offset;
 325                                         saved_color = c;
 326                                         goto skip;
 327                                 }
 328                                 px = (sh->objectid - bgstart) / 4096;
 329                                 for (j = 0; j < sh->offset / 4096; ++j) {
 330                                         int x = (px + j) % width;
 331                                         int y = (px + j) / width;
 332                                         gdImageSetPixel(im, x, y, c);
 333                                 }
 334                                 if (sh->objectid != last_end)
 335                                         ++areas;
 336                                 last_end = sh->objectid + sh->offset;
 337 skip:;
 338                         }
 339                         off += sh->len;
 340
 341                         /*
 342                          * record the mins in sk so we can make sure the
 343                          * next search doesn't repeat this root
 344                          */
 345                         sk->min_objectid = sh->objectid;
 346                         sk->min_type = sh->type;
 347                         sk->min_offset = sh->offset;
 348                 }
 349                 sk->nr_items = 4096;
 350
 351                 /* increment by one */
 352                 if (++sk->min_offset == 0)
 353                         if (++sk->min_type == 0)
 354                                 if (++sk->min_objectid == 0)
 355                                         break;
 356         }
 357
 358         if (im) {
 359                 push_im(im, name, dir);
 360                 print_bg(html, name, bgstart, bglen, bgused, bgflags, areas);
 361         }
 362
 363         if (use_color) {
 364                 fprintf(html, "<p>");
 365                 fprintf(html, "data - dark red, ");
 366                 fprintf(html, "fs tree - black, ");
 367                 fprintf(html, "extent tree - green, ");
 368                 fprintf(html, "csum tree - blue, ");
 369                 fprintf(html, "reloc tree - grey, ");
 370                 fprintf(html, "other trees - red, ");
 371                 fprintf(html, "unknown tree - dark grey");
 372                 fprintf(html, "</p>");
 373         }
 374         fprintf(html, "</body></html>\n");
 375
 376 out_close:
 377         fclose(html);
 378
 379         return ret;
 380 }
 381
 382 void
 383 usage(void)
 384 {
 385         printf("usage: btrfs-fragments [options] <path>\n");
 386         printf("         -c               use color\n");
 387         printf("         -d               print data chunks\n");
 388         printf("         -m               print metadata chunks\n");
 389         printf("         -s               print system chunks\n");
 390         printf("                          (default is data+metadata)\n");
 391         printf("         -o <dir>         output directory, default is html\n");
 392         exit(1);
 393 }
 394
 395 int main(int argc, char **argv)
 396 {
 397         char *path;
 398         int fd;
 399         int ret;
 400         u64 flags = 0;
 401         char *dir = "html";
 402         DIR *dirstream = NULL;
 403
 404         while (1) {
 405                 int c = getopt(argc, argv, "cmso:h");
 406                 if (c < 0)
 407                         break;
 408                 switch (c) {
 409                 case 'c':
 410                         use_color = 1;
 411                         break;
 412                 case 'd':
 413                         flags |= BTRFS_BLOCK_GROUP_DATA;
 414                         break;
 415                 case 'm':
 416                         flags |= BTRFS_BLOCK_GROUP_METADATA;
 417                         break;
 418                 case 's':
 419                         flags |= BTRFS_BLOCK_GROUP_SYSTEM;
 420                         break;
 421                 case 'o':
 422                         dir = optarg;
 423                         break;
 424                 case 'h':
 425                 default:
 426                         usage();
 427                 }
 428         }
 429
 430         set_argv0(argv);
 431         argc = argc - optind;
 432         if (check_argc_min(argc, 1)) {
 433                 usage();
 434                 exit(1);
 435         }
 436
 437         path = argv[optind++];
 438
 439         fd = open_file_or_dir(path, &dirstream);
 440         if (fd < 0) {
 441                 fprintf(stderr, "ERROR: can't access '%s'\n", path);
 442                 exit(1);
 443         }
 444
 445         if (flags == 0)
 446                 flags = BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA;
 447
 448         ret = list_fragments(fd, flags, dir);
 449         close_file_or_dir(fd, dirstream);
 450         if (ret)
 451                 exit(1);
 452
 453         exit(0);
 454 }