cmds-inspect.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 <unistd.h>
  20 #include <sys/ioctl.h>
  21 #include <errno.h>
  22 #include <sys/stat.h>
  23
  24 #include "kerncompat.h"
  25 #include "ioctl.h"
  26 #include "ctree.h"
  27
  28 #include "commands.h"
  29 #include "btrfs-list.h"
  30
  31 static const char * const inspect_cmd_group_usage[] = {
  32         "btrfs inspect-internal <command> <args>",
  33         NULL
  34 };
  35
  36 static int __ino_to_path_fd(u64 inum, int fd, int verbose, const char *prepend)
  37 {
  38         int ret;
  39         int i;
  40         struct btrfs_ioctl_ino_path_args ipa;
  41         struct btrfs_data_container *fspath;
  42
  43         fspath = malloc(4096);
  44         if (!fspath)
  45                 return 1;
  46
  47         ipa.inum = inum;
  48         ipa.size = 4096;
  49         ipa.fspath = (u64)fspath;
  50
  51         ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
  52         if (ret) {
  53                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
  54                 goto out;
  55         }
  56
  57         if (verbose)
  58                 printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
  59                         "cnt=%d, missed=%d\n", ret,
  60                         (unsigned long)fspath->bytes_left,
  61                         (unsigned long)fspath->bytes_missing,
  62                         fspath->elem_cnt, fspath->elem_missed);
  63
  64         for (i = 0; i < fspath->elem_cnt; ++i) {
  65                 char **str = (char **)fspath->val;
  66                 str[i] += (unsigned long)fspath->val;
  67                 if (prepend)
  68                         printf("%s/%s\n", prepend, str[i]);
  69                 else
  70                         printf("%s\n", str[i]);
  71         }
  72
  73 out:
  74         free(fspath);
  75         return ret;
  76 }
  77
  78 static const char * const cmd_inode_resolve_usage[] = {
  79         "btrfs inspect-internal inode-resolve [-v] <inode> <path>",
  80         "Get file system paths for the given inode",
  81         NULL
  82 };
  83
  84 static int cmd_inode_resolve(int argc, char **argv)
  85 {
  86         int fd;
  87         int verbose = 0;
  88
  89         optind = 1;
  90         while (1) {
  91                 int c = getopt(argc, argv, "v");
  92                 if (c < 0)
  93                         break;
  94
  95                 switch (c) {
  96                 case 'v':
  97                         verbose = 1;
  98                         break;
  99                 default:
 100                         usage(cmd_inode_resolve_usage);
 101                 }
 102         }
 103
 104         if (check_argc_exact(argc - optind, 2))
 105                 usage(cmd_inode_resolve_usage);
 106
 107         fd = open_file_or_dir(argv[optind+1]);
 108         if (fd < 0) {
 109                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 110                 return 12;
 111         }
 112
 113         return __ino_to_path_fd(atoll(argv[optind]), fd, verbose,
 114                                 argv[optind+1]);
 115 }
 116
 117 static const char * const cmd_logical_resolve_usage[] = {
 118         "btrfs inspect-internal logical-resolve [-Pv] [-s bufsize] <logical> <path>",
 119         "Get file system paths for the given logical address",
 120         "-P          skip the path resolving and print the inodes instead",
 121         "-v          verbose mode",
 122         "-s bufsize  set inode container's size. This is used to increase inode",
 123         "            container's size in case it is not enough to read all the ",
 124         "            resolved results. The max value one can set is 64k",
 125         NULL
 126 };
 127
 128 static int cmd_logical_resolve(int argc, char **argv)
 129 {
 130         int ret;
 131         int fd;
 132         int i;
 133         int verbose = 0;
 134         int getpath = 1;
 135         int bytes_left;
 136         struct btrfs_ioctl_logical_ino_args loi;
 137         struct btrfs_data_container *inodes;
 138         u64 size = 4096;
 139         char full_path[4096];
 140         char *path_ptr;
 141
 142         optind = 1;
 143         while (1) {
 144                 int c = getopt(argc, argv, "Pvs:");
 145                 if (c < 0)
 146                         break;
 147
 148                 switch (c) {
 149                 case 'P':
 150                         getpath = 0;
 151                         break;
 152                 case 'v':
 153                         verbose = 1;
 154                         break;
 155                 case 's':
 156                         size = atoll(optarg);
 157                         break;
 158                 default:
 159                         usage(cmd_logical_resolve_usage);
 160                 }
 161         }
 162
 163         if (check_argc_exact(argc - optind, 2))
 164                 usage(cmd_logical_resolve_usage);
 165
 166         size = min(size, (u64)64 * 1024);
 167         inodes = malloc(size);
 168         if (!inodes)
 169                 return 1;
 170
 171         loi.logical = atoll(argv[optind]);
 172         loi.size = size;
 173         loi.inodes = (u64)inodes;
 174
 175         fd = open_file_or_dir(argv[optind+1]);
 176         if (fd < 0) {
 177                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 178                 ret = 12;
 179                 goto out;
 180         }
 181
 182         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 183         if (ret) {
 184                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 185                 goto out;
 186         }
 187
 188         if (verbose)
 189                 printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
 190                         "bytes_missing=%lu, cnt=%d, missed=%d\n",
 191                         ret, size,
 192                         (unsigned long)inodes->bytes_left,
 193                         (unsigned long)inodes->bytes_missing,
 194                         inodes->elem_cnt, inodes->elem_missed);
 195
 196         bytes_left = sizeof(full_path);
 197         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 198         path_ptr = full_path + ret;
 199         bytes_left -= ret + 1;
 200         BUG_ON(bytes_left < 0);
 201
 202         for (i = 0; i < inodes->elem_cnt; i += 3) {
 203                 u64 inum = inodes->val[i];
 204                 u64 offset = inodes->val[i+1];
 205                 u64 root = inodes->val[i+2];
 206                 int path_fd;
 207                 char *name;
 208
 209                 if (getpath) {
 210                         name = btrfs_list_path_for_root(fd, root);
 211                         if (IS_ERR(name))
 212                                 return PTR_ERR(name);
 213                         if (!name) {
 214                                 path_ptr[-1] = '\0';
 215                                 path_fd = fd;
 216                         } else {
 217                                 path_ptr[-1] = '/';
 218                                 ret = snprintf(path_ptr, bytes_left, "%s",
 219                                                 name);
 220                                 BUG_ON(ret >= bytes_left);
 221                                 free(name);
 222                                 path_fd = open_file_or_dir(full_path);
 223                                 if (path_fd < 0) {
 224                                         fprintf(stderr, "ERROR: can't access "
 225                                                 "'%s'\n", full_path);
 226                                         goto out;
 227                                 }
 228                         }
 229                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 230                 } else {
 231                         printf("inode %llu offset %llu root %llu\n", inum,
 232                                 offset, root);
 233                 }
 234         }
 235
 236 out:
 237         free(inodes);
 238         return ret;
 239 }
 240
 241 static const char * const cmd_bsum_usage[] = {
 242         "btrfs inspect-internal _bsum <blockno> <file>",
 243         "Get file block checksum of given file",
 244         NULL
 245 };
 246
 247 static int csum_for_offset(int fd, u64 offset, u8 *csums, int *count)
 248 {
 249         struct btrfs_ioctl_search_args args;
 250         struct btrfs_ioctl_search_key *sk = &args.key;
 251         struct btrfs_ioctl_search_header *sh;
 252         int ret = 0;
 253         int i;
 254         unsigned off;
 255         u32 *realcsums = (u32*)csums;
 256
 257         sk->tree_id = BTRFS_CSUM_TREE_OBJECTID;
 258         sk->min_objectid = BTRFS_EXTENT_CSUM_OBJECTID;
 259         sk->max_objectid = BTRFS_EXTENT_CSUM_OBJECTID;
 260         sk->max_type = BTRFS_EXTENT_CSUM_KEY;
 261         sk->min_type = BTRFS_EXTENT_CSUM_KEY;
 262         sk->min_offset = offset;
 263         sk->max_offset = (u64)-1;
 264         sk->max_transid = (u64)-1;
 265         sk->nr_items = 1;
 266
 267         printf("Search block: %llu\n", (unsigned long long)sk->min_offset);
 268         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 269         if (ret) {
 270                 printf("%s: search ioctl: ioctl ret=%d, error: %s\n", __func__, ret, strerror(errno));
 271                 ret = -1;
 272                 goto out;
 273         }
 274         if (sk->nr_items == 0) {
 275                 printf("no items found\n");
 276                 ret = -2;
 277                 goto out;
 278         }
 279         off = 0;
 280         *count = 0;
 281         for (i = 0; i < sk->nr_items; i++) {
 282                 u32 item;
 283                 int j;
 284                 int csum_size = sizeof(item);
 285
 286                 sh = (struct btrfs_ioctl_search_header *)(args.buf +
 287                                 off);
 288
 289                 printf("SH: tid %llu objid %llu off %llu type %u len %u\n",
 290                                 (unsigned long long)sh->transid,
 291                                 (unsigned long long)sh->objectid,
 292                                 (unsigned long long)sh->offset,
 293                                 (unsigned)sh->type,
 294                                 (unsigned)sh->len);
 295
 296                 off += sizeof(*sh);
 297                 for (j = 0; j < sh->len / csum_size; j++) {
 298                         memcpy(&item, args.buf + off + j * csum_size, sizeof(item));
 299                         printf("DATA[%d]: u32 = 0x%08x\n", j, item);
 300                         realcsums[*count] = item;
 301                         *count += 1;
 302                 }
 303                 off += sh->len;
 304
 305                 sk->min_objectid = sh->objectid;
 306                 sk->min_type = sh->type;
 307                 sk->min_offset = sh->offset;
 308         }
 309 out:
 310         return ret;
 311 }
 312
 313 static int extent_offset_to_physical(int fd, u64 ino, u64 offset, u64 *phys)
 314 {
 315         struct btrfs_ioctl_search_args args;
 316         struct btrfs_ioctl_search_key *sk = &args.key;
 317         struct btrfs_ioctl_search_header *sh;
 318         int ret = 0;
 319         unsigned off;
 320         int i;
 321
 322         sk->tree_id = BTRFS_FS_TREE_OBJECTID;
 323         sk->min_objectid = ino;
 324         sk->max_objectid = ino;
 325         sk->max_type = BTRFS_EXTENT_DATA_KEY;
 326         sk->min_type = BTRFS_EXTENT_DATA_KEY;
 327         sk->min_offset = offset;
 328         sk->max_offset = (u64)-1;
 329         sk->max_transid = (u64)-1;
 330         sk->nr_items = 1;
 331
 332         printf("Search extent offset: %llu\n", (unsigned long long)sk->min_offset);
 333         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 334         if (ret) {
 335                 printf("%s: search ioctl: ioctl ret=%d, error: %s\n", __func__, ret, strerror(errno));
 336                 ret = -1;
 337                 goto out;
 338         }
 339         if (sk->nr_items == 0) {
 340                 printf("no items found\n");
 341                 ret = -2;
 342                 goto out;
 343         }
 344         off = 0;
 345         for (i = 0; i < sk->nr_items; i++) {
 346                 struct btrfs_file_extent_item fi;
 347
 348                 sh = (struct btrfs_ioctl_search_header *)(args.buf +
 349                                 off);
 350
 351                 printf("SH: tid %llu objid %llu off %llu type %u len %u\n",
 352                                 (unsigned long long)sh->transid,
 353                                 (unsigned long long)sh->objectid,
 354                                 (unsigned long long)sh->offset,
 355                                 (unsigned)sh->type,
 356                                 (unsigned)sh->len);
 357
 358                 off += sizeof(*sh);
 359                 /* process data */
 360                 memcpy(&fi, args.buf + off, sizeof(fi));
 361                 printf("FI: disk_bytenr %llu disk_num_bytes %llu offset %llu\n",
 362                                 (unsigned long long)fi.disk_bytenr,
 363                                 (unsigned long long)fi.disk_num_bytes,
 364                                 (unsigned long long)fi.offset);
 365                 *phys = fi.disk_bytenr;
 366
 367                 off += sh->len;
 368
 369                 sk->min_objectid = sh->objectid;
 370                 sk->min_type = sh->type;
 371                 sk->min_offset = sh->offset;
 372         }
 373 out:
 374         return ret;
 375 }
 376
 377 static int cmd_bsum(int argc, char **argv)
 378 {
 379         int fd;
 380         int ret = 0;
 381         int j;
 382         struct stat st;
 383         u8 csums[4096];
 384         int count = 0;
 385         u64 offset = 0;
 386         u64 phys = 0;
 387
 388         optind = 1;
 389         while (1) {
 390                 int c = getopt(argc, argv, "");
 391                 if (c < 0)
 392                         break;
 393
 394                 switch (c) {
 395                 default:
 396                         usage(cmd_logical_resolve_usage);
 397                 }
 398         }
 399
 400         if (check_argc_exact(argc - optind, 2)) {
 401                 usage(cmd_logical_resolve_usage);
 402                 return 1;
 403         }
 404
 405         fd = open_file_or_dir(argv[optind+1]);
 406         if (fd < 0) {
 407                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 408                 ret = 12;
 409                 goto out;
 410         }
 411         offset = atoi(argv[optind]);
 412         if(fstat(fd, &st) == -1) {
 413                 fprintf(stderr, "ERROR: stat\n");
 414                 ret = 1;
 415                 goto out;
 416         }
 417         printf("Inode: %llu\n", (unsigned long long)st.st_ino);
 418         printf("Offset: %llu\n", (unsigned long long)offset);
 419         extent_offset_to_physical(fd, st.st_ino, offset, &phys);
 420         printf("Physical: %llu\n", (unsigned long long)phys);
 421         csum_for_offset(fd, phys, csums, &count);
 422         for (j = 0; j < count; j++) {
 423                 u32 *items = (u32*)csums;
 424                 printf("BLOCK[%d] CSUM=0x%x\n",
 425                         j, items[j]);
 426         }
 427
 428 out:
 429         return ret;
 430 }
 431
 432 const struct cmd_group inspect_cmd_group = {
 433         inspect_cmd_group_usage, NULL, {
 434                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 435                         NULL, 0 },
 436                 { "logical-resolve", cmd_logical_resolve,
 437                         cmd_logical_resolve_usage, NULL, 0 },
 438                 { "_bsum", cmd_bsum,
 439                         cmd_bsum_usage, NULL, 0 },
 440                 { 0, 0, 0, 0, 0 }
 441         }
 442 };
 443
 444 int cmd_inspect(int argc, char **argv)
 445 {
 446         return handle_command_group(&inspect_cmd_group, argc, argv);
 447 }