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25b5bb3056
The main purpose is to debug "hot" records from ctdb. ctdb tracks
contended records and identifies them by key in the dbstatistics:
DB Statistics: locking.tdb
[...]
Num Hot Keys: 1
Count:3 Key:6a4128e3ced4681b02a00000000000000000000000000000
This command allows querying additional information for the associated
key to identify the affected file. For now this only adds a subcommand
for the locking.tdb, but could be extended to others:
net tdb locking 6a4128e3ced4681b02a00000000000000000000000000000
Share path: /test/share
Name: testfile
Number of share modes: 2
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*
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* Samba Unix/Linux client library
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* net tdb commands to query tdb record information
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* Copyright (C) 2016, 2017 Christof Schmitt <cs@samba.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "utils/net.h"
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#include "locking/proto.h"
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#include "librpc/gen_ndr/open_files.h"
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#include "librpc/gen_ndr/ndr_open_files.h"
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static int net_tdb_locking_dump(TALLOC_CTX *mem_ctx,
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struct share_mode_data *data)
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{
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struct ndr_print *ndr_print;
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ndr_print = talloc_zero(mem_ctx, struct ndr_print);
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if (ndr_print == NULL) {
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d_printf("Could not allocate memory.\n");
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return -1;
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}
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ndr_print->print = ndr_print_printf_helper;
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ndr_print->depth = 1;
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ndr_print_share_mode_data(ndr_print, "SHARE_MODE_DATA", data);
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TALLOC_FREE(ndr_print);
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return 0;
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}
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static int net_tdb_locking_fetch(TALLOC_CTX *mem_ctx, const char *hexkey,
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struct share_mode_lock **lock)
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{
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DATA_BLOB blob;
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struct file_id id;
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bool ok;
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blob = strhex_to_data_blob(mem_ctx, hexkey);
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if (blob.length != sizeof(struct file_id)) {
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d_printf("Invalid length of key\n");
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return -1;
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}
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id = *(struct file_id *)blob.data;
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ok = locking_init_readonly();
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if (!ok) {
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d_printf("locking_init_readonly failed\n");
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return -1;
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}
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*lock = fetch_share_mode_unlocked(mem_ctx, id);
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if (*lock == NULL) {
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d_printf("Record with key %s not found.\n", hexkey);
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return -1;
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}
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return 0;
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}
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static int net_tdb_locking(struct net_context *c, int argc, const char **argv)
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{
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TALLOC_CTX *mem_ctx = talloc_stackframe();
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struct share_mode_lock *lock;
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int ret;
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if (argc < 1) {
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d_printf("Usage: net tdb locking <key> [ dump ]\n");
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ret = -1;
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goto out;
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}
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ret = net_tdb_locking_fetch(mem_ctx, argv[0], &lock);
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if (ret != 0) {
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goto out;
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}
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if (argc == 2 && strequal(argv[1], "dump")) {
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ret = net_tdb_locking_dump(mem_ctx, lock->data);
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} else {
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d_printf("Share path: %s\n", lock->data->servicepath);
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d_printf("Name: %s\n", lock->data->base_name);
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d_printf("Number of share modes: %" PRIu32 "\n",
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lock->data->num_share_modes);
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}
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out:
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TALLOC_FREE(mem_ctx);
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return ret;
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}
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int net_tdb(struct net_context *c, int argc, const char **argv)
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{
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struct functable func[] = {
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{ "locking",
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net_tdb_locking,
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NET_TRANSPORT_LOCAL,
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N_("Show information for a record in locking.tdb"),
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N_("net tdb locking <key>")
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},
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{NULL, NULL, 0, NULL, NULL}
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};
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return net_run_function(c, argc, argv, "net tdb", func);
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}
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