git.sesse.net Git - bcachefs-tools-debian/blob - c_src/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/errcode.h"
  13 #include "libbcachefs/error.h"
  14 #include "libbcachefs/sb-members.h"
  15 #include "libbcachefs/super.h"
  16
  17 static void kill_btree_node_usage(void)
  18 {
  19         puts("bcachefs kill_btree_node - make btree nodes unreadable\n"
  20              "Usage: bcachefs kill_btree_node [OPTION]... <devices>\n"
  21              "\n"
  22              "Options:\n"
  23              "  -b (extents|inodes|dirents|xattrs)    Btree to delete from\n"
  24              "  -l level                              Levle to delete from (0 == leaves)\n"
  25              "  -i index                              Index of btree node to kill\n"
  26              "  -h                                    Display this help and exit\n"
  27              "Report bugs to <linux-bcachefs@vger.kernel.org>");
  28 }
  29
  30 int cmd_kill_btree_node(int argc, char *argv[])
  31 {
  32         struct bch_opts opts = bch2_opts_empty();
  33         enum btree_id btree_id = 0;
  34         unsigned level = 0;
  35         u64 node_index = 0;
  36         int opt;
  37
  38         opt_set(opts, read_only,        true);
  39
  40         while ((opt = getopt(argc, argv, "b:l:i:h")) != -1)
  41                 switch (opt) {
  42                 case 'b':
  43                         btree_id = read_string_list_or_die(optarg,
  44                                                 __bch2_btree_ids, "btree id");
  45                         break;
  46                 case 'l':
  47                         if (kstrtouint(optarg, 10, &level) || level >= BTREE_MAX_DEPTH)
  48                                 die("invalid level");
  49                         break;
  50                 case 'i':
  51                         if (kstrtoull(optarg, 10, &node_index))
  52                                 die("invalid index %s", optarg);
  53                         break;
  54                 case 'h':
  55                         kill_btree_node_usage();
  56                         exit(EXIT_SUCCESS);
  57                 }
  58         args_shift(optind);
  59
  60         if (!argc)
  61                 die("Please supply device(s)");
  62
  63         struct bch_fs *c = bch2_fs_open(argv, argc, opts);
  64         if (IS_ERR(c))
  65                 die("error opening %s: %s", argv[0], bch2_err_str(PTR_ERR(c)));
  66
  67         struct btree_trans *trans = bch2_trans_get(c);
  68         struct btree_iter iter;
  69         struct btree *b;
  70         int ret;
  71         void *zeroes;
  72
  73         ret = posix_memalign(&zeroes, c->opts.block_size, c->opts.block_size);
  74         if (ret)
  75                 die("error %s from posix_memalign", bch2_err_str(ret));
  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 printbuf buf = PRINTBUF;
  83                         bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
  84                         bch_info(c, "killing btree node %s", buf.buf);
  85                         printbuf_exit(&buf);
  86
  87                         struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
  88                         bkey_for_each_ptr(ptrs, ptr) {
  89                                 struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
  90
  91                                 ret = pwrite(ca->disk_sb.bdev->bd_fd, zeroes,
  92                                              c->opts.block_size, ptr->offset << 9);
  93                                 if (ret != c->opts.block_size) {
  94                                         bch_err(c, "pwrite error: expected %u got %i %s",
  95                                                 c->opts.block_size, ret, strerror(errno));
  96                                         ret = EXIT_FAILURE;
  97                                         goto done;
  98                                 }
  99                         }
 100                         ret = 0;
 101                         goto done;
 102                 }
 103
 104                 node_index--;
 105         }
 106         if (ret)
 107                 bch_err(c, "error %i walking btree nodes", ret);
 108         else
 109                 bch_err(c, "node at specified index not found");
 110         ret = EXIT_FAILURE;
 111 done:
 112         bch2_trans_iter_exit(trans, &iter);
 113         bch2_trans_put(trans);
 114
 115         bch2_fs_stop(c);
 116         return ret;
 117 }