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

   1 #include <fcntl.h>
   2 #include <string.h>
   3 #include <sys/stat.h>
   4 #include <sys/types.h>
   5
   6 #include "cmds.h"
   7 #include "libbcachefs.h"
   8 #include "tools-util.h"
   9
  10 #include "libbcachefs/bcachefs.h"
  11 #include "libbcachefs/btree_iter.h"
  12 #include "libbcachefs/error.h"
  13 #include "libbcachefs/super.h"
  14
  15 static void kill_btree_node_usage(void)
  16 {
  17         puts("bcachefs kill_btree_node - make btree nodes unreadable\n"
  18              "Usage: bcachefs kill_btree_node [OPTION]... <devices>\n"
  19              "\n"
  20              "Options:\n"
  21              "  -b (extents|inodes|dirents|xattrs)    Btree to delete from\n"
  22              "  -l level                              Levle to delete from (0 == leaves)\n"
  23              "  -i index                              Index of btree node to kill\n"
  24              "  -h                                    Display this help and exit\n"
  25              "Report bugs to <linux-bcachefs@vger.kernel.org>");
  26 }
  27
  28 int cmd_kill_btree_node(int argc, char *argv[])
  29 {
  30         struct bch_opts opts = bch2_opts_empty();
  31         enum btree_id btree_id = 0;
  32         unsigned level = 0;
  33         u64 node_index = 0;
  34         int opt;
  35
  36         opt_set(opts, read_only,        true);
  37
  38         while ((opt = getopt(argc, argv, "b:l:i:h")) != -1)
  39                 switch (opt) {
  40                 case 'b':
  41                         btree_id = read_string_list_or_die(optarg,
  42                                                 bch2_btree_ids, "btree id");
  43                         break;
  44                 case 'l':
  45                         if (kstrtouint(optarg, 10, &level) || level >= BTREE_MAX_DEPTH)
  46                                 die("invalid level");
  47                         break;
  48                 case 'i':
  49                         if (kstrtoull(optarg, 10, &node_index))
  50                                 die("invalid index %s", optarg);
  51                         break;
  52                 case 'h':
  53                         kill_btree_node_usage();
  54                         exit(EXIT_SUCCESS);
  55                 }
  56         args_shift(optind);
  57
  58         if (!argc)
  59                 die("Please supply device(s)");
  60
  61         struct bch_fs *c = bch2_fs_open(argv, argc, opts);
  62         if (IS_ERR(c))
  63                 die("error opening %s: %s", argv[0], strerror(-PTR_ERR(c)));
  64
  65         struct btree_trans trans;
  66         struct btree_iter iter;
  67         struct btree *b;
  68         int ret;
  69         void *zeroes;
  70
  71         ret = posix_memalign(&zeroes, c->opts.block_size, c->opts.block_size);
  72         if (ret)
  73                 die("error %s from posix_memalign", strerror(ret));
  74
  75         bch2_trans_init(&trans, c, 0, 0);
  76
  77         __for_each_btree_node(&trans, iter, btree_id, POS_MIN, 0, level, 0, b, ret) {
  78                 if (b->c.level != level)
  79                         continue;
  80
  81                 if (!node_index) {
  82                         struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
  83                         const struct bch_extent_ptr *ptr;
  84
  85                         struct printbuf buf = PRINTBUF;
  86
  87                         bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
  88                         bch_info(c, "killing btree node %s", buf.buf);
  89                         printbuf_exit(&buf);
  90
  91                         bkey_for_each_ptr(ptrs, ptr) {
  92                                 struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
  93
  94                                 ret = pwrite(ca->disk_sb.bdev->bd_fd, zeroes,
  95                                              c->opts.block_size, ptr->offset << 9);
  96                                 if (ret != c->opts.block_size) {
  97                                         bch_err(c, "pwrite error: expected %u got %i %s",
  98                                                 c->opts.block_size, ret, strerror(errno));
  99                                         ret = EXIT_FAILURE;
 100                                         goto done;
 101                                 }
 102                         }
 103                         goto done;
 104                 }
 105
 106                 node_index--;
 107         }
 108         if (ret)
 109                 bch_err(c, "error %i walking btree nodes", ret);
 110         else
 111                 bch_err(c, "node at specified index not found");
 112         ret = EXIT_FAILURE;
 113 done:
 114         bch2_trans_iter_exit(&trans, &iter);
 115         bch2_trans_exit(&trans);
 116
 117         bch2_fs_stop(c);
 118         return ret;
 119 }