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
  28 #include "commands.h"
  29 #include "btrfs-list.h"
  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 = (uintptr_t)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] [-s bufsize] <logical> <path>",
 119         "Get file system paths for the given logical address",
 120         "-P          skip the path resolving and print the inodes instead",
 121         "-v          verbose mode",
 122         "-s bufsize  set inode container's size. This is used to increase inode",
 123         "            container's size in case it is not enough to read all the ",
 124         "            resolved results. The max value one can set is 64k",
 125         NULL
 126 };
 127
 128 static int cmd_logical_resolve(int argc, char **argv)
 129 {
 130         int ret;
 131         int fd;
 132         int i;
 133         int verbose = 0;
 134         int getpath = 1;
 135         int bytes_left;
 136         struct btrfs_ioctl_logical_ino_args loi;
 137         struct btrfs_data_container *inodes;
 138         u64 size = 4096;
 139         char full_path[4096];
 140         char *path_ptr;
 141
 142         optind = 1;
 143         while (1) {
 144                 int c = getopt(argc, argv, "Pvs:");
 145                 if (c < 0)
 146                         break;
 147
 148                 switch (c) {
 149                 case 'P':
 150                         getpath = 0;
 151                         break;
 152                 case 'v':
 153                         verbose = 1;
 154                         break;
 155                 case 's':
 156                         size = atoll(optarg);
 157                         break;
 158                 default:
 159                         usage(cmd_logical_resolve_usage);
 160                 }
 161         }
 162
 163         if (check_argc_exact(argc - optind, 2))
 164                 usage(cmd_logical_resolve_usage);
 165
 166         size = min(size, (u64)64 * 1024);
 167         inodes = malloc(size);
 168         if (!inodes)
 169                 return 1;
 170
 171         loi.logical = atoll(argv[optind]);
 172         loi.size = size;
 173         loi.inodes = (uintptr_t)inodes;
 174
 175         fd = open_file_or_dir(argv[optind+1]);
 176         if (fd < 0) {
 177                 fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
 178                 ret = 12;
 179                 goto out;
 180         }
 181
 182         ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi);
 183         if (ret) {
 184                 printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
 185                 goto out;
 186         }
 187
 188         if (verbose)
 189                 printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, "
 190                         "bytes_missing=%lu, cnt=%d, missed=%d\n",
 191                         ret, size,
 192                         (unsigned long)inodes->bytes_left,
 193                         (unsigned long)inodes->bytes_missing,
 194                         inodes->elem_cnt, inodes->elem_missed);
 195
 196         bytes_left = sizeof(full_path);
 197         ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
 198         path_ptr = full_path + ret;
 199         bytes_left -= ret + 1;
 200         BUG_ON(bytes_left < 0);
 201
 202         for (i = 0; i < inodes->elem_cnt; i += 3) {
 203                 u64 inum = inodes->val[i];
 204                 u64 offset = inodes->val[i+1];
 205                 u64 root = inodes->val[i+2];
 206                 int path_fd;
 207                 char *name;
 208
 209                 if (getpath) {
 210                         name = btrfs_list_path_for_root(fd, root);
 211                         if (IS_ERR(name))
 212                                 return PTR_ERR(name);
 213                         if (!name) {
 214                                 path_ptr[-1] = '\0';
 215                                 path_fd = fd;
 216                         } else {
 217                                 path_ptr[-1] = '/';
 218                                 ret = snprintf(path_ptr, bytes_left, "%s",
 219                                                 name);
 220                                 BUG_ON(ret >= bytes_left);
 221                                 free(name);
 222                                 path_fd = open_file_or_dir(full_path);
 223                                 if (path_fd < 0) {
 224                                         fprintf(stderr, "ERROR: can't access "
 225                                                 "'%s'\n", full_path);
 226                                         goto out;
 227                                 }
 228                         }
 229                         __ino_to_path_fd(inum, path_fd, verbose, full_path);
 230                 } else {
 231                         printf("inode %llu offset %llu root %llu\n", inum,
 232                                 offset, root);
 233                 }
 234         }
 235
 236 out:
 237         free(inodes);
 238         return ret;
 239 }
 240
 241 const struct cmd_group inspect_cmd_group = {
 242         inspect_cmd_group_usage, NULL, {
 243                 { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 244                         NULL, 0 },
 245                 { "logical-resolve", cmd_logical_resolve,
 246                         cmd_logical_resolve_usage, NULL, 0 },
 247                 { 0, 0, 0, 0, 0 }
 248         }
 249 };
 250
 251 int cmd_inspect(int argc, char **argv)
 252 {
 253         return handle_command_group(&inspect_cmd_group, argc, argv);
 254 }