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/super.h"
  17
  18 static void dump_usage(void)
  19 {
  20         puts("bcachefs dump - dump filesystem metadata\n"
  21              "Usage: bcachefs dump [OPTION]... <devices>\n"
  22              "\n"
  23              "Options:\n"
  24              "  -o output     Output qcow2 image(s)\n"
  25              "  -f, --force   Force; overwrite when needed\n"
  26              "  --nojournal   Don't dump entire journal, just dirty entries\n"
  27              "  -h, --help    Display this help and exit\n"
  28              "Report bugs to <linux-bcachefs@vger.kernel.org>");
  29 }
  30
  31 static void dump_one_device(struct bch_fs *c, struct bch_dev *ca, int fd,
  32                             bool entire_journal)
  33 {
  34         struct bch_sb *sb = ca->disk_sb.sb;
  35         ranges data = { 0 };
  36         unsigned i;
  37         int ret;
  38
  39         /* Superblock: */
  40         range_add(&data, BCH_SB_LAYOUT_SECTOR << 9,
  41                   sizeof(struct bch_sb_layout));
  42
  43         for (i = 0; i < sb->layout.nr_superblocks; i++)
  44                 range_add(&data,
  45                           le64_to_cpu(sb->layout.sb_offset[i]) << 9,
  46                           vstruct_bytes(sb));
  47
  48         /* Journal: */
  49         for (i = 0; i < ca->journal.nr; i++)
  50                 if (entire_journal ||
  51                     ca->journal.bucket_seq[i] >= c->journal.last_seq_ondisk) {
  52                         u64 bucket = ca->journal.buckets[i];
  53
  54                         range_add(&data,
  55                                   bucket_bytes(ca) * bucket,
  56                                   bucket_bytes(ca));
  57                 }
  58
  59         /* Btree: */
  60         for (i = 0; i < BTREE_ID_NR; i++) {
  61                 const struct bch_extent_ptr *ptr;
  62                 struct bkey_ptrs_c ptrs;
  63                 struct btree_trans trans;
  64                 struct btree_iter iter;
  65                 struct btree *b;
  66
  67                 bch2_trans_init(&trans, c, 0, 0);
  68
  69                 __for_each_btree_node(&trans, iter, i, POS_MIN, 0, 1, 0, b, ret) {
  70                         struct btree_node_iter iter;
  71                         struct bkey u;
  72                         struct bkey_s_c k;
  73
  74                         for_each_btree_node_key_unpack(b, k, &iter, &u) {
  75                                 ptrs = bch2_bkey_ptrs_c(k);
  76
  77                                 bkey_for_each_ptr(ptrs, ptr)
  78                                         if (ptr->dev == ca->dev_idx)
  79                                                 range_add(&data,
  80                                                           ptr->offset << 9,
  81                                                           btree_bytes(c));
  82                         }
  83                 }
  84
  85                 if (ret)
  86                         die("error %s walking btree nodes", bch2_err_str(ret));
  87
  88                 b = bch2_btree_id_root(c, i)->b;
  89                 if (!btree_node_fake(b)) {
  90                         ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
  91
  92                         bkey_for_each_ptr(ptrs, ptr)
  93                                 if (ptr->dev == ca->dev_idx)
  94                                         range_add(&data,
  95                                                   ptr->offset << 9,
  96                                                   btree_bytes(c));
  97                 }
  98
  99                 bch2_trans_iter_exit(&trans, &iter);
 100                 bch2_trans_exit(&trans);
 101         }
 102
 103         qcow2_write_image(ca->disk_sb.bdev->bd_buffered_fd, fd, &data,
 104                           max_t(unsigned, btree_bytes(c) / 8, block_bytes(c)));
 105         darray_exit(&data);
 106 }
 107
 108 int cmd_dump(int argc, char *argv[])
 109 {
 110         static const struct option longopts[] = {
 111                 { "force",              no_argument,            NULL, 'f' },
 112                 { "nojournal",          no_argument,            NULL, 'j' },
 113                 { "verbose",            no_argument,            NULL, 'v' },
 114                 { "help",               no_argument,            NULL, 'h' },
 115                 { NULL }
 116         };
 117         struct bch_opts opts = bch2_opts_empty();
 118         struct bch_dev *ca;
 119         char *out = NULL;
 120         unsigned i, nr_devices = 0;
 121         bool force = false, entire_journal = true;
 122         int fd, opt;
 123
 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 %s: %s", argv[0], bch2_err_str(PTR_ERR(c)));
 160
 161         down_read(&c->gc_lock);
 162
 163         for_each_online_member(ca, c, i)
 164                 nr_devices++;
 165
 166         BUG_ON(!nr_devices);
 167
 168         for_each_online_member(ca, c, i) {
 169                 int flags = O_WRONLY|O_CREAT|O_TRUNC;
 170
 171                 if (!force)
 172                         flags |= O_EXCL;
 173
 174                 if (!c->devs[i])
 175                         continue;
 176
 177                 char *path = nr_devices > 1
 178                         ? mprintf("%s.%u.qcow2", out, i)
 179                         : mprintf("%s.qcow2", out);
 180                 fd = xopen(path, flags, 0600);
 181                 free(path);
 182
 183                 dump_one_device(c, ca, fd, entire_journal);
 184                 close(fd);
 185         }
 186
 187         up_read(&c->gc_lock);
 188
 189         bch2_fs_stop(c);
 190         return 0;
 191 }