diff options
author | Kent Overstreet <kent.overstreet@linux.dev> | 2022-11-13 20:09:40 -0500 |
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committer | Kent Overstreet <kent.overstreet@linux.dev> | 2022-11-13 20:09:40 -0500 |
commit | e2442e57f26d34ef35ad9127b130b7ad277d9dfb (patch) | |
tree | fb540957400d39b9cfef60e26f7260c1789db99a /cmd_kill_btree_node.c | |
parent | c1e4d447f6dd0ee60495b651436d2055db7777ed (diff) |
cmd_kill_btree_node.c
This factors out cmd_kill_btree_node into its own file - it was in
cmd_list_journal.c, which wsa rather silly.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'cmd_kill_btree_node.c')
-rw-r--r-- | cmd_kill_btree_node.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/cmd_kill_btree_node.c b/cmd_kill_btree_node.c new file mode 100644 index 00000000..a0e0fc9b --- /dev/null +++ b/cmd_kill_btree_node.c @@ -0,0 +1,119 @@ +#include <fcntl.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "cmds.h" +#include "libbcachefs.h" +#include "tools-util.h" + +#include "libbcachefs/bcachefs.h" +#include "libbcachefs/btree_iter.h" +#include "libbcachefs/error.h" +#include "libbcachefs/super.h" + +static void kill_btree_node_usage(void) +{ + puts("bcachefs kill_btree_node - make btree nodes unreadable\n" + "Usage: bcachefs kill_btree_node [OPTION]... <devices>\n" + "\n" + "Options:\n" + " -b (extents|inodes|dirents|xattrs) Btree to delete from\n" + " -l level Levle to delete from (0 == leaves)\n" + " -i index Index of btree node to kill\n" + " -h Display this help and exit\n" + "Report bugs to <linux-bcachefs@vger.kernel.org>"); +} + +int cmd_kill_btree_node(int argc, char *argv[]) +{ + struct bch_opts opts = bch2_opts_empty(); + enum btree_id btree_id = 0; + unsigned level = 0; + u64 node_index = 0; + int opt; + + opt_set(opts, read_only, true); + + while ((opt = getopt(argc, argv, "b:l:i:h")) != -1) + switch (opt) { + case 'b': + btree_id = read_string_list_or_die(optarg, + bch2_btree_ids, "btree id"); + break; + case 'l': + if (kstrtouint(optarg, 10, &level) || level >= BTREE_MAX_DEPTH) + die("invalid level"); + break; + case 'i': + if (kstrtoull(optarg, 10, &node_index)) + die("invalid index %s", optarg); + break; + case 'h': + kill_btree_node_usage(); + exit(EXIT_SUCCESS); + } + args_shift(optind); + + if (!argc) + die("Please supply device(s)"); + + struct bch_fs *c = bch2_fs_open(argv, argc, opts); + if (IS_ERR(c)) + die("error opening %s: %s", argv[0], strerror(-PTR_ERR(c))); + + struct btree_trans trans; + struct btree_iter iter; + struct btree *b; + int ret; + void *zeroes; + + ret = posix_memalign(&zeroes, c->opts.block_size, c->opts.block_size); + if (ret) + die("error %s from posix_memalign", strerror(ret)); + + bch2_trans_init(&trans, c, 0, 0); + + __for_each_btree_node(&trans, iter, btree_id, POS_MIN, 0, level, 0, b, ret) { + if (b->c.level != level) + continue; + + if (!node_index) { + struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(bkey_i_to_s_c(&b->key)); + const struct bch_extent_ptr *ptr; + + struct printbuf buf = PRINTBUF; + + bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key)); + bch_info(c, "killing btree node %s", buf.buf); + printbuf_exit(&buf); + + bkey_for_each_ptr(ptrs, ptr) { + struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev); + + ret = pwrite(ca->disk_sb.bdev->bd_fd, zeroes, + c->opts.block_size, ptr->offset << 9); + if (ret != c->opts.block_size) { + bch_err(c, "pwrite error: expected %u got %i %s", + c->opts.block_size, ret, strerror(errno)); + ret = EXIT_FAILURE; + goto done; + } + } + goto done; + } + + node_index--; + } + if (ret) + bch_err(c, "error %i walking btree nodes", ret); + else + bch_err(c, "node at specified index not found"); + ret = EXIT_FAILURE; +done: + bch2_trans_iter_exit(&trans, &iter); + bch2_trans_exit(&trans); + + bch2_fs_stop(c); + return ret; +} |