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