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
  23 #include "kerncompat.h"
  24 #include "ioctl.h"
  25
  26 #include "commands.h"
  27 #include "btrfs-list.h"
  28
  29 static const char * const inspect_cmd_group_usage[] = {
  30         "btrfs inspect-internal <command> <args>",
  31         NULL
  32 };
  33
  34 static int __ino_to_path_fd(u64 inum, int fd, int verbose, const char *prepend)
  35 {
  36         int ret;
  37         int i;
  38         struct btrfs_ioctl_ino_path_args ipa;
  39         struct btrfs_data_container *fspath;
  40
  41         fspath = malloc(4096);
  42         if (!fspath)
  43                 return 1;
  44
  45         ipa.inum = inum;
  46         ipa.size = 4096;
  47         ipa.fspath = (u64)fspath;
  48
  49         ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
  50         if (ret) {
  51                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
  52                 goto out;
  53         }
  54
  55         if (verbose)
  56                 printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
  57                         "cnt=%d, missed=%d\n", ret,
  58                         (unsigned long)fspath->bytes_left,
  59                         (unsigned long)fspath->bytes_missing,
  60                         fspath->elem_cnt, fspath->elem_missed);
  61
  62         for (i = 0; i < fspath->elem_cnt; ++i) {
  63                 char **str = (char **)fspath->val;
  64                 str[i] += (unsigned long)fspath->val;
  65                 if (prepend)
  66                         printf("%s/%s\n", prepend, str[i]);
  67                 else
  68                         printf("%s\n", str[i]);
  69         }
  70
  71 out:
  72         free(fspath);
  73         return ret;
  74 }
  75
  76 static const char * const cmd_inode_resolve_usage[] = {
  77         "btrfs inspect-internal inode-resolve [-v] <inode> <path>",
  78         "Get file system paths for the given inode",
  79         NULL
  80 };
  81
  82 static int cmd_inode_resolve(int argc, char **argv)
  83 {
  84         int fd;
  85         int verbose = 0;
  86
  87         optind = 1;
  88         while (1) {
  89                 int c = getopt(argc, argv, "v");
  90                 if (c < 0)
  91                         break;
  92
  93                 switch (c) {
  94                 case 'v':
  95                         verbose = 1;
  96                         break;
  97                 default:
  98                         usage(cmd_inode_resolve_usage);
  99                 }
 100         }
 101
 102         if (check_argc_exact(argc - optind, 2))
 103                 usage(cmd_inode_resolve_usage);
 104
 105         fd = open_file_or_dir(argv[optind+1]);
 106         if (fd < 0) {
 107                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 108                 return 12;
 109         }
 110
 111         return __ino_to_path_fd(atoll(argv[optind]), fd, verbose,
 112                                 argv[optind+1]);
 113 }
 114
 115 static const char * const cmd_logical_resolve_usage[] = {
 116         "btrfs inspect-internal logical-resolve [-Pv] [-s bufsize] <logical> <path>",
 117         "Get file system paths for the given logical address",
 118         "-P          skip the path resolving and print the inodes instead",
 119         "-v          verbose mode",
 120         "-s bufsize  set inode container's size. This is used to increase inode",
 121         "            container's size in case it is not enough to read all the ",
 122         "            resolved results. The max value one can set is 64k",
 123         NULL
 124 };
 125
 126 static int cmd_logical_resolve(int argc, char **argv)
 127 {
 128         int ret;
 129         int fd;
 130         int i;
 131         int verbose = 0;
 132         int getpath = 1;
 133         int bytes_left;
 134         struct btrfs_ioctl_logical_ino_args loi;
 135         struct btrfs_data_container *inodes;
 136         u64 size = 4096;
 137         char full_path[4096];
 138         char *path_ptr;
 139
 140         optind = 1;
 141         while (1) {
 142                 int c = getopt(argc, argv, "Pvs:");
 143                 if (c < 0)
 144                         break;
 145
 146                 switch (c) {
 147                 case 'P':
 148                         getpath = 0;
 149                         break;
 150                 case 'v':
 151                         verbose = 1;
 152                         break;
 153                 case 's':
 154                         size = atoll(optarg);
 155                         break;
 156                 default:
 157                         usage(cmd_logical_resolve_usage);
 158                 }
 159         }
 160
 161         if (check_argc_exact(argc - optind, 2))
 162                 usage(cmd_logical_resolve_usage);
 163
 164         size = min(size, 64 * 1024);
 165         inodes = malloc(size);
 166         if (!inodes)
 167                 return 1;
 168
 169         loi.logical = atoll(argv[optind]);
 170         loi.size = size;
 171         loi.inodes = (u64)inodes;
 172
 173         fd = open_file_or_dir(argv[optind+1]);
 174         if (fd < 0) {
 175                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 176                 ret = 12;
 177                 goto out;
 178         }
 179
 180         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 181         if (ret) {
 182                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 183                 goto out;
 184         }
 185
 186         if (verbose)
 187                 printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
 188                         "bytes_missing=%lu, cnt=%d, missed=%d\n",
 189                         ret, size,
 190                         (unsigned long)inodes->bytes_left,
 191                         (unsigned long)inodes->bytes_missing,
 192                         inodes->elem_cnt, inodes->elem_missed);
 193
 194         bytes_left = sizeof(full_path);
 195         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 196         path_ptr = full_path + ret;
 197         bytes_left -= ret + 1;
 198         BUG_ON(bytes_left < 0);
 199
 200         for (i = 0; i < inodes->elem_cnt; i += 3) {
 201                 u64 inum = inodes->val[i];
 202                 u64 offset = inodes->val[i+1];
 203                 u64 root = inodes->val[i+2];
 204                 int path_fd;
 205                 char *name;
 206
 207                 if (getpath) {
 208                         name = btrfs_list_path_for_root(fd, root);
 209                         if (IS_ERR(name))
 210                                 return PTR_ERR(name);
 211                         if (!name) {
 212                                 path_ptr[-1] = '\0';
 213                                 path_fd = fd;
 214                         } else {
 215                                 path_ptr[-1] = '/';
 216                                 ret = snprintf(path_ptr, bytes_left, "%s",
 217                                                 name);
 218                                 BUG_ON(ret >= bytes_left);
 219                                 free(name);
 220                                 path_fd = open_file_or_dir(full_path);
 221                                 if (path_fd < 0) {
 222                                         fprintf(stderr, "ERROR: can't access "
 223                                                 "'%s'\n", full_path);
 224                                         goto out;
 225                                 }
 226                         }
 227                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 228                 } else {
 229                         printf("inode %llu offset %llu root %llu\n", inum,
 230                                 offset, root);
 231                 }
 232         }
 233
 234 out:
 235         free(inodes);
 236         return ret;
 237 }
 238
 239 const struct cmd_group inspect_cmd_group = {
 240         inspect_cmd_group_usage, NULL, {
 241                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 242                         NULL, 0 },
 243                 { "logical-resolve", cmd_logical_resolve,
 244                         cmd_logical_resolve_usage, NULL, 0 },
 245                 { 0, 0, 0, 0, 0 }
 246         }
 247 };
 248
 249 int cmd_inspect(int argc, char **argv)
 250 {
 251         return handle_command_group(&inspect_cmd_group, argc, argv);
 252 }