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 #include "ctree.h"
  28 #include "send-utils.h"
  29
  30 #include "commands.h"
  31 #include "btrfs-list.h"
  32
  33 static const char * const inspect_cmd_group_usage[] = {
  34         "btrfs inspect-internal <command> <args>",
  35         NULL
  36 };
  37
  38 static int __ino_to_path_fd(u64 inum, int fd, int verbose, const char *prepend)
  39 {
  40         int ret;
  41         int i;
  42         struct btrfs_ioctl_ino_path_args ipa;
  43         struct btrfs_data_container *fspath;
  44
  45         fspath = malloc(4096);
  46         if (!fspath)
  47                 return 1;
  48
  49         memset(fspath, 0, sizeof(*fspath));
  50         ipa.inum = inum;
  51         ipa.size = 4096;
  52         ipa.fspath = (uintptr_t)fspath;
  53
  54         ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
  55         if (ret) {
  56                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
  57                 goto out;
  58         }
  59
  60         if (verbose)
  61                 printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
  62                         "cnt=%d, missed=%d\n", ret,
  63                         (unsigned long)fspath->bytes_left,
  64                         (unsigned long)fspath->bytes_missing,
  65                         fspath->elem_cnt, fspath->elem_missed);
  66
  67         for (i = 0; i < fspath->elem_cnt; ++i) {
  68                 u64 ptr;
  69                 char *str;
  70                 ptr = (u64)(unsigned long)fspath->val;
  71                 ptr += fspath->val[i];
  72                 str = (char *)(unsigned long)ptr;
  73                 if (prepend)
  74                         printf("%s/%s\n", prepend, str);
  75                 else
  76                         printf("%s\n", str);
  77         }
  78
  79 out:
  80         free(fspath);
  81         return ret;
  82 }
  83
  84 static const char * const cmd_inode_resolve_usage[] = {
  85         "btrfs inspect-internal inode-resolve [-v] <inode> <path>",
  86         "Get file system paths for the given inode",
  87         NULL
  88 };
  89
  90 static int cmd_inode_resolve(int argc, char **argv)
  91 {
  92         int fd;
  93         int verbose = 0;
  94         int ret;
  95         DIR *dirstream = NULL;
  96
  97         optind = 1;
  98         while (1) {
  99                 int c = getopt(argc, argv, "v");
 100                 if (c < 0)
 101                         break;
 102
 103                 switch (c) {
 104                 case 'v':
 105                         verbose = 1;
 106                         break;
 107                 default:
 108                         usage(cmd_inode_resolve_usage);
 109                 }
 110         }
 111
 112         if (check_argc_exact(argc - optind, 2))
 113                 usage(cmd_inode_resolve_usage);
 114
 115         fd = open_file_or_dir(argv[optind+1], &dirstream);
 116         if (fd < 0) {
 117                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 118                 return 12;
 119         }
 120
 121         ret = __ino_to_path_fd(atoll(argv[optind]), fd, verbose,
 122                                argv[optind+1]);
 123         close_file_or_dir(fd, dirstream);
 124         return ret;
 125
 126 }
 127
 128 static const char * const cmd_logical_resolve_usage[] = {
 129         "btrfs inspect-internal logical-resolve [-Pv] [-s bufsize] <logical> <path>",
 130         "Get file system paths for the given logical address",
 131         "-P          skip the path resolving and print the inodes instead",
 132         "-v          verbose mode",
 133         "-s bufsize  set inode container's size. This is used to increase inode",
 134         "            container's size in case it is not enough to read all the ",
 135         "            resolved results. The max value one can set is 64k",
 136         NULL
 137 };
 138
 139 static int cmd_logical_resolve(int argc, char **argv)
 140 {
 141         int ret;
 142         int fd;
 143         int i;
 144         int verbose = 0;
 145         int getpath = 1;
 146         int bytes_left;
 147         struct btrfs_ioctl_logical_ino_args loi;
 148         struct btrfs_data_container *inodes;
 149         u64 size = 4096;
 150         char full_path[4096];
 151         char *path_ptr;
 152         DIR *dirstream = NULL;
 153
 154         optind = 1;
 155         while (1) {
 156                 int c = getopt(argc, argv, "Pvs:");
 157                 if (c < 0)
 158                         break;
 159
 160                 switch (c) {
 161                 case 'P':
 162                         getpath = 0;
 163                         break;
 164                 case 'v':
 165                         verbose = 1;
 166                         break;
 167                 case 's':
 168                         size = atoll(optarg);
 169                         break;
 170                 default:
 171                         usage(cmd_logical_resolve_usage);
 172                 }
 173         }
 174
 175         if (check_argc_exact(argc - optind, 2))
 176                 usage(cmd_logical_resolve_usage);
 177
 178         size = min(size, (u64)64 * 1024);
 179         inodes = malloc(size);
 180         if (!inodes)
 181                 return 1;
 182
 183         memset(inodes, 0, sizeof(*inodes));
 184         loi.logical = atoll(argv[optind]);
 185         loi.size = size;
 186         loi.inodes = (uintptr_t)inodes;
 187
 188         fd = open_file_or_dir(argv[optind+1], &dirstream);
 189         if (fd < 0) {
 190                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 191                 ret = 12;
 192                 goto out;
 193         }
 194
 195         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 196         if (ret) {
 197                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 198                 goto out;
 199         }
 200
 201         if (verbose)
 202                 printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
 203                         "bytes_missing=%lu, cnt=%d, missed=%d\n",
 204                         ret, size,
 205                         (unsigned long)inodes->bytes_left,
 206                         (unsigned long)inodes->bytes_missing,
 207                         inodes->elem_cnt, inodes->elem_missed);
 208
 209         bytes_left = sizeof(full_path);
 210         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 211         path_ptr = full_path + ret;
 212         bytes_left -= ret + 1;
 213         BUG_ON(bytes_left < 0);
 214
 215         for (i = 0; i < inodes->elem_cnt; i += 3) {
 216                 u64 inum = inodes->val[i];
 217                 u64 offset = inodes->val[i+1];
 218                 u64 root = inodes->val[i+2];
 219                 int path_fd;
 220                 char *name;
 221                 DIR *dirs = NULL;
 222
 223                 if (getpath) {
 224                         name = btrfs_list_path_for_root(fd, root);
 225                         if (IS_ERR(name)) {
 226                                 ret = PTR_ERR(name);
 227                                 goto out;
 228                         }
 229                         if (!name) {
 230                                 path_ptr[-1] = '\0';
 231                                 path_fd = fd;
 232                         } else {
 233                                 path_ptr[-1] = '/';
 234                                 ret = snprintf(path_ptr, bytes_left, "%s",
 235                                                 name);
 236                                 BUG_ON(ret >= bytes_left);
 237                                 free(name);
 238                                 path_fd = open_file_or_dir(full_path, &dirs);
 239                                 if (path_fd < 0) {
 240                                         fprintf(stderr, "ERROR: can't access "
 241                                                 "'%s'\n", full_path);
 242                                         goto out;
 243                                 }
 244                         }
 245                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 246                         if (path_fd != fd)
 247                                 close_file_or_dir(path_fd, dirs);
 248                 } else {
 249                         printf("inode %llu offset %llu root %llu\n", inum,
 250                                 offset, root);
 251                 }
 252         }
 253
 254 out:
 255         close_file_or_dir(fd, dirstream);
 256         free(inodes);
 257         return ret;
 258 }
 259
 260 static const char * const cmd_subvolid_resolve_usage[] = {
 261         "btrfs inspect-internal subvolid-resolve <subvolid> <path>",
 262         "Get file system paths for the given subvolume ID.",
 263         NULL
 264 };
 265
 266 static int cmd_subvolid_resolve(int argc, char **argv)
 267 {
 268         int ret;
 269         int fd = -1;
 270         u64 subvol_id;
 271         char path[BTRFS_PATH_NAME_MAX + 1];
 272         DIR *dirstream = NULL;
 273
 274         if (check_argc_exact(argc, 3))
 275                 usage(cmd_subvolid_resolve_usage);
 276
 277         fd = open_file_or_dir(argv[2], &dirstream);
 278         if (fd < 0) {
 279                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[2]);
 280                 ret = -ENOENT;
 281                 goto out;
 282         }
 283
 284         subvol_id = atoll(argv[1]);
 285         ret = btrfs_subvolid_resolve(fd, path, sizeof(path), subvol_id);
 286
 287         if (ret) {
 288                 fprintf(stderr,
 289                         "%s: btrfs_subvolid_resolve(subvol_id %llu) failed with ret=%d\n",
 290                         argv[0], (unsigned long long)subvol_id, ret);
 291                 goto out;
 292         }
 293
 294         path[BTRFS_PATH_NAME_MAX] = '\0';
 295         printf("%s\n", path);
 296
 297 out:
 298         close_file_or_dir(fd, dirstream);
 299         return ret ? 1 : 0;
 300 }
 301
 302 const struct cmd_group inspect_cmd_group = {
 303         inspect_cmd_group_usage, NULL, {
 304                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 305                         NULL, 0 },
 306                 { "logical-resolve", cmd_logical_resolve,
 307                         cmd_logical_resolve_usage, NULL, 0 },
 308                 { "subvolid-resolve", cmd_subvolid_resolve,
 309                         cmd_subvolid_resolve_usage, NULL, 0 },
 310                 { 0, 0, 0, 0, 0 }
 311         }
 312 };
 313
 314 int cmd_inspect(int argc, char **argv)
 315 {
 316         return handle_command_group(&inspect_cmd_group, argc, argv);
 317 }