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 <stdint.h>
  21 #include <sys/ioctl.h>
  22 #include <errno.h>
  23
  24 #include "kerncompat.h"
  25 #include "ioctl.h"
  26 #include "utils.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         memset(fspath, 0, sizeof(*fspath));
  48         ipa.inum = inum;
  49         ipa.size = 4096;
  50         ipa.fspath = (uintptr_t)fspath;
  51
  52         ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
  53         if (ret) {
  54                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
  55                 goto out;
  56         }
  57
  58         if (verbose)
  59                 printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
  60                         "cnt=%d, missed=%d\n", ret,
  61                         (unsigned long)fspath->bytes_left,
  62                         (unsigned long)fspath->bytes_missing,
  63                         fspath->elem_cnt, fspath->elem_missed);
  64
  65         for (i = 0; i < fspath->elem_cnt; ++i) {
  66                 char **str = (char **)fspath->val;
  67                 str[i] += (unsigned long)fspath->val;
  68                 if (prepend)
  69                         printf("%s/%s\n", prepend, str[i]);
  70                 else
  71                         printf("%s\n", str[i]);
  72         }
  73
  74 out:
  75         free(fspath);
  76         return ret;
  77 }
  78
  79 static const char * const cmd_inode_resolve_usage[] = {
  80         "btrfs inspect-internal inode-resolve [-v] <inode> <path>",
  81         "Get file system paths for the given inode",
  82         NULL
  83 };
  84
  85 static int cmd_inode_resolve(int argc, char **argv)
  86 {
  87         int fd;
  88         int verbose = 0;
  89         int ret;
  90
  91         optind = 1;
  92         while (1) {
  93                 int c = getopt(argc, argv, "v");
  94                 if (c < 0)
  95                         break;
  96
  97                 switch (c) {
  98                 case 'v':
  99                         verbose = 1;
 100                         break;
 101                 default:
 102                         usage(cmd_inode_resolve_usage);
 103                 }
 104         }
 105
 106         if (check_argc_exact(argc - optind, 2))
 107                 usage(cmd_inode_resolve_usage);
 108
 109         fd = open_file_or_dir(argv[optind+1]);
 110         if (fd < 0) {
 111                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 112                 return 12;
 113         }
 114
 115         ret = __ino_to_path_fd(atoll(argv[optind]), fd, verbose,
 116                                argv[optind+1]);
 117         close(fd);
 118         return ret;
 119
 120 }
 121
 122 static const char * const cmd_logical_resolve_usage[] = {
 123         "btrfs inspect-internal logical-resolve [-Pv] [-s bufsize] <logical> <path>",
 124         "Get file system paths for the given logical address",
 125         "-P          skip the path resolving and print the inodes instead",
 126         "-v          verbose mode",
 127         "-s bufsize  set inode container's size. This is used to increase inode",
 128         "            container's size in case it is not enough to read all the ",
 129         "            resolved results. The max value one can set is 64k",
 130         NULL
 131 };
 132
 133 static int cmd_logical_resolve(int argc, char **argv)
 134 {
 135         int ret;
 136         int fd;
 137         int i;
 138         int verbose = 0;
 139         int getpath = 1;
 140         int bytes_left;
 141         struct btrfs_ioctl_logical_ino_args loi;
 142         struct btrfs_data_container *inodes;
 143         u64 size = 4096;
 144         char full_path[4096];
 145         char *path_ptr;
 146
 147         optind = 1;
 148         while (1) {
 149                 int c = getopt(argc, argv, "Pvs:");
 150                 if (c < 0)
 151                         break;
 152
 153                 switch (c) {
 154                 case 'P':
 155                         getpath = 0;
 156                         break;
 157                 case 'v':
 158                         verbose = 1;
 159                         break;
 160                 case 's':
 161                         size = atoll(optarg);
 162                         break;
 163                 default:
 164                         usage(cmd_logical_resolve_usage);
 165                 }
 166         }
 167
 168         if (check_argc_exact(argc - optind, 2))
 169                 usage(cmd_logical_resolve_usage);
 170
 171         size = min(size, (u64)64 * 1024);
 172         inodes = malloc(size);
 173         if (!inodes)
 174                 return 1;
 175
 176         memset(inodes, 0, sizeof(*inodes));
 177         loi.logical = atoll(argv[optind]);
 178         loi.size = size;
 179         loi.inodes = (uintptr_t)inodes;
 180
 181         fd = open_file_or_dir(argv[optind+1]);
 182         if (fd < 0) {
 183                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 184                 ret = 12;
 185                 goto out;
 186         }
 187
 188         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 189         if (ret) {
 190                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 191                 goto out;
 192         }
 193
 194         if (verbose)
 195                 printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
 196                         "bytes_missing=%lu, cnt=%d, missed=%d\n",
 197                         ret, size,
 198                         (unsigned long)inodes->bytes_left,
 199                         (unsigned long)inodes->bytes_missing,
 200                         inodes->elem_cnt, inodes->elem_missed);
 201
 202         bytes_left = sizeof(full_path);
 203         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 204         path_ptr = full_path + ret;
 205         bytes_left -= ret + 1;
 206         BUG_ON(bytes_left < 0);
 207
 208         for (i = 0; i < inodes->elem_cnt; i += 3) {
 209                 u64 inum = inodes->val[i];
 210                 u64 offset = inodes->val[i+1];
 211                 u64 root = inodes->val[i+2];
 212                 int path_fd;
 213                 char *name;
 214
 215                 if (getpath) {
 216                         name = btrfs_list_path_for_root(fd, root);
 217                         if (IS_ERR(name)) {
 218                                 ret = PTR_ERR(name);
 219                                 goto out;
 220                         }
 221                         if (!name) {
 222                                 path_ptr[-1] = '\0';
 223                                 path_fd = fd;
 224                         } else {
 225                                 path_ptr[-1] = '/';
 226                                 ret = snprintf(path_ptr, bytes_left, "%s",
 227                                                 name);
 228                                 BUG_ON(ret >= bytes_left);
 229                                 free(name);
 230                                 path_fd = open_file_or_dir(full_path);
 231                                 if (path_fd < 0) {
 232                                         fprintf(stderr, "ERROR: can't access "
 233                                                 "'%s'\n", full_path);
 234                                         goto out;
 235                                 }
 236                         }
 237                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 238                         if (path_fd != fd)
 239                                 close(path_fd);
 240                 } else {
 241                         printf("inode %llu offset %llu root %llu\n", inum,
 242                                 offset, root);
 243                 }
 244         }
 245
 246 out:
 247         if (fd >= 0)
 248                 close(fd);
 249         free(inodes);
 250         return ret;
 251 }
 252
 253 const struct cmd_group inspect_cmd_group = {
 254         inspect_cmd_group_usage, NULL, {
 255                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 256                         NULL, 0 },
 257                 { "logical-resolve", cmd_logical_resolve,
 258                         cmd_logical_resolve_usage, NULL, 0 },
 259                 { 0, 0, 0, 0, 0 }
 260         }
 261 };
 262
 263 int cmd_inspect(int argc, char **argv)
 264 {
 265         return handle_command_group(&inspect_cmd_group, argc, argv);
 266 }