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