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] <logical> <path>",
 117         "Get file system paths for the given logical address",
 118         NULL
 119 };
 120
 121 static int cmd_logical_resolve(int argc, char **argv)
 122 {
 123         int ret;
 124         int fd;
 125         int i;
 126         int verbose = 0;
 127         int getpath = 1;
 128         int bytes_left;
 129         struct btrfs_ioctl_logical_ino_args loi;
 130         struct btrfs_data_container *inodes;
 131         char full_path[4096];
 132         char *path_ptr;
 133
 134         optind = 1;
 135         while (1) {
 136                 int c = getopt(argc, argv, "Pv");
 137                 if (c < 0)
 138                         break;
 139
 140                 switch (c) {
 141                 case 'P':
 142                         getpath = 0;
 143                         break;
 144                 case 'v':
 145                         verbose = 1;
 146                         break;
 147                 default:
 148                         usage(cmd_logical_resolve_usage);
 149                 }
 150         }
 151
 152         if (check_argc_exact(argc - optind, 2))
 153                 usage(cmd_logical_resolve_usage);
 154
 155         inodes = malloc(4096);
 156         if (!inodes)
 157                 return 1;
 158
 159         loi.logical = atoll(argv[optind]);
 160         loi.size = 4096;
 161         loi.inodes = (u64)inodes;
 162
 163         fd = open_file_or_dir(argv[optind+1]);
 164         if (fd < 0) {
 165                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 166                 ret = 12;
 167                 goto out;
 168         }
 169
 170         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 171         if (ret) {
 172                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 173                 goto out;
 174         }
 175
 176         if (verbose)
 177                 printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, "
 178                         "cnt=%d, missed=%d\n", ret,
 179                         (unsigned long)inodes->bytes_left,
 180                         (unsigned long)inodes->bytes_missing,
 181                         inodes->elem_cnt, inodes->elem_missed);
 182
 183         bytes_left = sizeof(full_path);
 184         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 185         path_ptr = full_path + ret;
 186         bytes_left -= ret + 1;
 187         BUG_ON(bytes_left < 0);
 188
 189         for (i = 0; i < inodes->elem_cnt; i += 3) {
 190                 u64 inum = inodes->val[i];
 191                 u64 offset = inodes->val[i+1];
 192                 u64 root = inodes->val[i+2];
 193                 int path_fd;
 194                 char *name;
 195
 196                 if (getpath) {
 197                         name = path_for_root(fd, root);
 198                         if (IS_ERR(name))
 199                                 return PTR_ERR(name);
 200                         if (!name) {
 201                                 path_ptr[-1] = '\0';
 202                                 path_fd = fd;
 203                         } else {
 204                                 path_ptr[-1] = '/';
 205                                 ret = snprintf(path_ptr, bytes_left, "%s",
 206                                                 name);
 207                                 BUG_ON(ret >= bytes_left);
 208                                 free(name);
 209                                 path_fd = open_file_or_dir(full_path);
 210                                 if (path_fd < 0) {
 211                                         fprintf(stderr, "ERROR: can't access "
 212                                                 "'%s'\n", full_path);
 213                                         goto out;
 214                                 }
 215                         }
 216                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 217                 } else {
 218                         printf("inode %llu offset %llu root %llu\n", inum,
 219                                 offset, root);
 220                 }
 221         }
 222
 223 out:
 224         free(inodes);
 225         return ret;
 226 }
 227
 228 const struct cmd_group inspect_cmd_group = {
 229         inspect_cmd_group_usage, NULL, {
 230                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 231                         NULL, 0 },
 232                 { "logical-resolve", cmd_logical_resolve,
 233                         cmd_logical_resolve_usage, NULL, 0 },
 234                 { 0, 0, 0, 0, 0 }
 235         }
 236 };
 237
 238 int cmd_inspect(int argc, char **argv)
 239 {
 240         return handle_command_group(&inspect_cmd_group, argc, argv);
 241 }