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/errcode.h"
  13 #include "libbcachefs/error.h"
  14 #include "libbcachefs/super.h"
  15
  16 static void kill_btree_node_usage(void)
  17 {
  18         puts("bcachefs kill_btree_node - make btree nodes unreadable\n"
  19              "Usage: bcachefs kill_btree_node [OPTION]... <devices>\n"
  20              "\n"
  21              "Options:\n"
  22              "  -b (extents|inodes|dirents|xattrs)    Btree to delete from\n"
  23              "  -l level                              Levle to delete from (0 == leaves)\n"
  24              "  -i index                              Index of btree node to kill\n"
  25              "  -h                                    Display this help and exit\n"
  26              "Report bugs to <linux-bcachefs@vger.kernel.org>");
  27 }
  28
  29 int cmd_kill_btree_node(int argc, char *argv[])
  30 {
  31         struct bch_opts opts = bch2_opts_empty();
  32         enum btree_id btree_id = 0;
  33         unsigned level = 0;
  34         u64 node_index = 0;
  35         int opt;
  36
  37         opt_set(opts, read_only,        true);
  38
  39         while ((opt = getopt(argc, argv, "b:l:i:h")) != -1)
  40                 switch (opt) {
  41                 case 'b':
  42                         btree_id = read_string_list_or_die(optarg,
  43                                                 bch2_btree_ids, "btree id");
  44                         break;
  45                 case 'l':
  46                         if (kstrtouint(optarg, 10, &level) || level >= BTREE_MAX_DEPTH)
  47                                 die("invalid level");
  48                         break;
  49                 case 'i':
  50                         if (kstrtoull(optarg, 10, &node_index))
  51                                 die("invalid index %s", optarg);
  52                         break;
  53                 case 'h':
  54                         kill_btree_node_usage();
  55                         exit(EXIT_SUCCESS);
  56                 }
  57         args_shift(optind);
  58
  59         if (!argc)
  60                 die("Please supply device(s)");
  61
  62         struct bch_fs *c = bch2_fs_open(argv, argc, opts);
  63         if (IS_ERR(c))
  64                 die("error opening %s: %s", argv[0], bch2_err_str(PTR_ERR(c)));
  65
  66         struct btree_trans trans;
  67         struct btree_iter iter;
  68         struct btree *b;
  69         int ret;
  70         void *zeroes;
  71
  72         ret = posix_memalign(&zeroes, c->opts.block_size, c->opts.block_size);
  73         if (ret)
  74                 die("error %s from posix_memalign", bch2_err_str(ret));
  75
  76         bch2_trans_init(&trans, c, 0, 0);
  77
  78         __for_each_btree_node(&trans, iter, btree_id, POS_MIN, 0, level, 0, b, ret) {
  79                 if (b->c.level != level)
  80                         continue;
  81
  82                 if (!node_index) {
  83                         struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key));
  84                         const struct bch_extent_ptr *ptr;
  85
  86                         struct printbuf buf = PRINTBUF;
  87
  88                         bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
  89                         bch_info(c, "killing btree node %s", buf.buf);
  90                         printbuf_exit(&buf);
  91
  92                         bkey_for_each_ptr(ptrs, ptr) {
  93                                 struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
  94
  95                                 ret = pwrite(ca->disk_sb.bdev->bd_fd, zeroes,
  96                                              c->opts.block_size, ptr->offset << 9);
  97                                 if (ret != c->opts.block_size) {
  98                                         bch_err(c, "pwrite error: expected %u got %i %s",
  99                                                 c->opts.block_size, ret, strerror(errno));
 100                                         ret = EXIT_FAILURE;
 101                                         goto done;
 102                                 }
 103                         }
 104                         goto done;
 105                 }
 106
 107                 node_index--;
 108         }
 109         if (ret)
 110                 bch_err(c, "error %i walking btree nodes", ret);
 111         else
 112                 bch_err(c, "node at specified index not found");
 113         ret = EXIT_FAILURE;
 114 done:
 115         bch2_trans_iter_exit(&trans, &iter);
 116         bch2_trans_exit(&trans);
 117
 118         bch2_fs_stop(c);
 119         return ret;
 120 }