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