git.sesse.net Git - bcachefs-tools-debian/blob - c_src/cmd_dump.c

   1 #include <fcntl.h>
   2 #include <getopt.h>
   3 #include <string.h>
   4 #include <sys/stat.h>
   5 #include <sys/types.h>
   6
   7 #include "cmds.h"
   8 #include "libbcachefs.h"
   9 #include "qcow2.h"
  10
  11 #include "libbcachefs/bcachefs.h"
  12 #include "libbcachefs/btree_cache.h"
  13 #include "libbcachefs/btree_io.h"
  14 #include "libbcachefs/btree_iter.h"
  15 #include "libbcachefs/error.h"
  16 #include "libbcachefs/extents.h"
  17 #include "libbcachefs/sb-members.h"
  18 #include "libbcachefs/super.h"
  19
  20 static void dump_usage(void)
  21 {
  22         puts("bcachefs dump - dump filesystem metadata\n"
  23              "Usage: bcachefs dump [OPTION]... <devices>\n"
  24              "\n"
  25              "Options:\n"
  26              "  -o output     Output qcow2 image(s)\n"
  27              "  -f, --force   Force; overwrite when needed\n"
  28              "  --nojournal   Don't dump entire journal, just dirty entries\n"
  29              "  -h, --help    Display this help and exit\n"
  30              "Report bugs to <linux-bcachefs@vger.kernel.org>");
  31 }
  32
  33 static void dump_one_device(struct bch_fs *c, struct bch_dev *ca, int fd,
  34                             bool entire_journal)
  35 {
  36         struct bch_sb *sb = ca->disk_sb.sb;
  37         ranges data = { 0 };
  38         unsigned i;
  39         int ret;
  40
  41         /* Superblock: */
  42         range_add(&data, BCH_SB_LAYOUT_SECTOR << 9,
  43                   sizeof(struct bch_sb_layout));
  44
  45         for (i = 0; i < sb->layout.nr_superblocks; i++)
  46                 range_add(&data,
  47                           le64_to_cpu(sb->layout.sb_offset[i]) << 9,
  48                           vstruct_bytes(sb));
  49
  50         /* Journal: */
  51         for (i = 0; i < ca->journal.nr; i++)
  52                 if (entire_journal ||
  53                     ca->journal.bucket_seq[i] >= c->journal.last_seq_ondisk) {
  54                         u64 bucket = ca->journal.buckets[i];
  55
  56                         range_add(&data,
  57                                   bucket_bytes(ca) * bucket,
  58                                   bucket_bytes(ca));
  59                 }
  60
  61         /* Btree: */
  62         for (i = 0; i < BTREE_ID_NR; i++) {
  63                 struct bkey_ptrs_c ptrs;
  64                 struct btree_trans *trans = bch2_trans_get(c);
  65                 struct btree_iter iter;
  66                 struct btree *b;
  67
  68                 __for_each_btree_node(trans, iter, i, POS_MIN, 0, 1, 0, b, ret) {
  69                         struct btree_node_iter iter;
  70                         struct bkey u;
  71                         struct bkey_s_c k;
  72
  73                         for_each_btree_node_key_unpack(b, k, &iter, &u) {
  74                                 ptrs = bch2_bkey_ptrs_c(k);
  75
  76                                 bkey_for_each_ptr(ptrs, ptr)
  77                                         if (ptr->dev == ca->dev_idx)
  78                                                 range_add(&data,
  79                                                           ptr->offset << 9,
  80                                                           btree_ptr_sectors_written(&b->key));
  81                         }
  82                 }
  83
  84                 if (ret)
  85                         die("error %s walking btree nodes", bch2_err_str(ret));
  86
  87                 b = bch2_btree_id_root(c, i)->b;
  88                 if (!btree_node_fake(b)) {
  89                         ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
  90
  91                         bkey_for_each_ptr(ptrs, ptr)
  92                                 if (ptr->dev == ca->dev_idx)
  93                                         range_add(&data,
  94                                                   ptr->offset << 9,
  95                                                   btree_ptr_sectors_written(&b->key));
  96                 }
  97
  98                 bch2_trans_iter_exit(trans, &iter);
  99                 bch2_trans_put(trans);
 100         }
 101
 102         qcow2_write_image(ca->disk_sb.bdev->bd_fd, fd, &data,
 103                           max_t(unsigned, c->opts.btree_node_size / 8, block_bytes(c)));
 104         darray_exit(&data);
 105 }
 106
 107 int cmd_dump(int argc, char *argv[])
 108 {
 109         static const struct option longopts[] = {
 110                 { "force",              no_argument,            NULL, 'f' },
 111                 { "nojournal",          no_argument,            NULL, 'j' },
 112                 { "verbose",            no_argument,            NULL, 'v' },
 113                 { "help",               no_argument,            NULL, 'h' },
 114                 { NULL }
 115         };
 116         struct bch_opts opts = bch2_opts_empty();
 117         char *out = NULL;
 118         unsigned nr_devices = 0;
 119         bool force = false, entire_journal = true;
 120         int fd, opt;
 121
 122         opt_set(opts, direct_io,        false);
 123         opt_set(opts, read_only,        true);
 124         opt_set(opts, nochanges,        true);
 125         opt_set(opts, norecovery,       true);
 126         opt_set(opts, degraded,         true);
 127         opt_set(opts, errors,           BCH_ON_ERROR_continue);
 128         opt_set(opts, fix_errors,       FSCK_FIX_no);
 129
 130         while ((opt = getopt_long(argc, argv, "o:fvh",
 131                                   longopts, NULL)) != -1)
 132                 switch (opt) {
 133                 case 'o':
 134                         out = optarg;
 135                         break;
 136                 case 'f':
 137                         force = true;
 138                         break;
 139                 case 'j':
 140                         entire_journal = false;
 141                         break;
 142                 case 'v':
 143                         opt_set(opts, verbose, true);
 144                         break;
 145                 case 'h':
 146                         dump_usage();
 147                         exit(EXIT_SUCCESS);
 148                 }
 149         args_shift(optind);
 150
 151         if (!out)
 152                 die("Please supply output filename");
 153
 154         if (!argc)
 155                 die("Please supply device(s) to check");
 156
 157         struct bch_fs *c = bch2_fs_open(argv, argc, opts);
 158         if (IS_ERR(c))
 159                 die("error opening devices: %s", bch2_err_str(PTR_ERR(c)));
 160
 161         down_read(&c->gc_lock);
 162
 163         for_each_online_member(c, ca)
 164                 nr_devices++;
 165
 166         BUG_ON(!nr_devices);
 167
 168         for_each_online_member(c, ca) {
 169                 int flags = O_WRONLY|O_CREAT|O_TRUNC;
 170
 171                 if (!force)
 172                         flags |= O_EXCL;
 173
 174                 char *path = nr_devices > 1
 175                         ? mprintf("%s.%u.qcow2", out, ca->dev_idx)
 176                         : mprintf("%s.qcow2", out);
 177                 fd = xopen(path, flags, 0600);
 178                 free(path);
 179
 180                 dump_one_device(c, ca, fd, entire_journal);
 181                 close(fd);
 182         }
 183
 184         up_read(&c->gc_lock);
 185
 186         bch2_fs_stop(c);
 187         return 0;
 188 }