1251881Speter/* checksum-reps-table.c : operations on the `checksum-reps' table 2251881Speter * 3251881Speter * ==================================================================== 4251881Speter * Licensed to the Apache Software Foundation (ASF) under one 5251881Speter * or more contributor license agreements. See the NOTICE file 6251881Speter * distributed with this work for additional information 7251881Speter * regarding copyright ownership. The ASF licenses this file 8251881Speter * to you under the Apache License, Version 2.0 (the 9251881Speter * "License"); you may not use this file except in compliance 10251881Speter * with the License. You may obtain a copy of the License at 11251881Speter * 12251881Speter * http://www.apache.org/licenses/LICENSE-2.0 13251881Speter * 14251881Speter * Unless required by applicable law or agreed to in writing, 15251881Speter * software distributed under the License is distributed on an 16251881Speter * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17251881Speter * KIND, either express or implied. See the License for the 18251881Speter * specific language governing permissions and limitations 19251881Speter * under the License. 20251881Speter * ==================================================================== 21251881Speter */ 22251881Speter 23251881Speter#include <apr_strings.h> 24251881Speter 25251881Speter#include "bdb_compat.h" 26251881Speter#include "../fs.h" 27251881Speter#include "../err.h" 28251881Speter#include "../key-gen.h" 29251881Speter#include "dbt.h" 30251881Speter#include "../trail.h" 31251881Speter#include "bdb-err.h" 32251881Speter#include "../../libsvn_fs/fs-loader.h" 33251881Speter#include "checksum-reps-table.h" 34251881Speter 35251881Speter#include "svn_private_config.h" 36251881Speter 37251881Speter 38251881Speterint svn_fs_bdb__open_checksum_reps_table(DB **checksum_reps_p, 39251881Speter DB_ENV *env, 40251881Speter svn_boolean_t create) 41251881Speter{ 42251881Speter const u_int32_t open_flags = (create ? (DB_CREATE | DB_EXCL) : 0); 43251881Speter DB *checksum_reps; 44251881Speter int error; 45251881Speter 46251881Speter BDB_ERR(svn_fs_bdb__check_version()); 47251881Speter BDB_ERR(db_create(&checksum_reps, env, 0)); 48251881Speter error = (checksum_reps->open)(SVN_BDB_OPEN_PARAMS(checksum_reps, NULL), 49251881Speter "checksum-reps", 0, DB_BTREE, 50251881Speter open_flags, 0666); 51251881Speter 52251881Speter /* Create the checksum-reps table if it doesn't exist. */ 53251881Speter if (error == ENOENT && (! create)) 54251881Speter { 55251881Speter BDB_ERR(checksum_reps->close(checksum_reps, 0)); 56251881Speter return svn_fs_bdb__open_checksum_reps_table(checksum_reps_p, env, TRUE); 57251881Speter } 58251881Speter 59251881Speter /* Create the initial `next-key' table entry. */ 60251881Speter if (create) 61251881Speter { 62251881Speter DBT key, value; 63251881Speter BDB_ERR(checksum_reps->put(checksum_reps, 0, 64251881Speter svn_fs_base__str_to_dbt(&key, NEXT_KEY_KEY), 65251881Speter svn_fs_base__str_to_dbt(&value, "0"), 0)); 66251881Speter } 67251881Speter 68251881Speter BDB_ERR(error); 69251881Speter 70251881Speter *checksum_reps_p = checksum_reps; 71251881Speter return 0; 72251881Speter} 73251881Speter 74251881Spetersvn_error_t *svn_fs_bdb__get_checksum_rep(const char **rep_key, 75251881Speter svn_fs_t *fs, 76251881Speter svn_checksum_t *checksum, 77251881Speter trail_t *trail, 78251881Speter apr_pool_t *pool) 79251881Speter{ 80251881Speter base_fs_data_t *bfd = fs->fsap_data; 81251881Speter DBT key, value; 82251881Speter int db_err; 83251881Speter 84251881Speter /* We only allow SHA1 checksums in this table. */ 85251881Speter if (checksum->kind != svn_checksum_sha1) 86251881Speter return svn_error_create(SVN_ERR_BAD_CHECKSUM_KIND, NULL, 87251881Speter _("Only SHA1 checksums can be used as keys in the " 88251881Speter "checksum-reps table.\n")); 89251881Speter 90251881Speter svn_fs_base__trail_debug(trail, "checksum-reps", "get"); 91251881Speter db_err = bfd->checksum_reps->get(bfd->checksum_reps, trail->db_txn, 92251881Speter svn_fs_base__checksum_to_dbt(&key, checksum), 93251881Speter svn_fs_base__result_dbt(&value), 0); 94251881Speter svn_fs_base__track_dbt(&value, pool); 95251881Speter 96251881Speter if (db_err == DB_NOTFOUND) 97251881Speter return svn_fs_base__err_no_such_checksum_rep(fs, checksum); 98251881Speter 99251881Speter *rep_key = apr_pstrmemdup(pool, value.data, value.size); 100251881Speter return SVN_NO_ERROR; 101251881Speter} 102251881Speter 103251881Spetersvn_error_t *svn_fs_bdb__set_checksum_rep(svn_fs_t *fs, 104251881Speter svn_checksum_t *checksum, 105251881Speter const char *rep_key, 106251881Speter trail_t *trail, 107251881Speter apr_pool_t *pool) 108251881Speter{ 109251881Speter base_fs_data_t *bfd = fs->fsap_data; 110251881Speter DBT key, value; 111251881Speter int db_err; 112251881Speter 113251881Speter /* We only allow SHA1 checksums in this table. */ 114251881Speter if (checksum->kind != svn_checksum_sha1) 115251881Speter return svn_error_create(SVN_ERR_BAD_CHECKSUM_KIND, NULL, 116251881Speter _("Only SHA1 checksums can be used as keys in the " 117251881Speter "checksum-reps table.\n")); 118251881Speter 119251881Speter /* Create a key from our CHECKSUM. */ 120251881Speter svn_fs_base__checksum_to_dbt(&key, checksum); 121251881Speter 122251881Speter /* Check to see if we already have a mapping for CHECKSUM. If so, 123251881Speter and the value is the same one we were about to write, that's 124251881Speter cool -- just do nothing. If, however, the value is *different*, 125251881Speter that's a red flag! */ 126251881Speter svn_fs_base__trail_debug(trail, "checksum-reps", "get"); 127251881Speter db_err = bfd->checksum_reps->get(bfd->checksum_reps, trail->db_txn, 128251881Speter &key, svn_fs_base__result_dbt(&value), 0); 129251881Speter svn_fs_base__track_dbt(&value, pool); 130251881Speter if (db_err != DB_NOTFOUND) 131251881Speter { 132251881Speter const char *sum_str = svn_checksum_to_cstring_display(checksum, pool); 133251881Speter return svn_error_createf 134251881Speter (SVN_ERR_FS_ALREADY_EXISTS, NULL, 135251881Speter _("Representation key for checksum '%s' exists in filesystem '%s'."), 136251881Speter sum_str, fs->path); 137251881Speter } 138251881Speter 139251881Speter /* Create a value from our REP_KEY, and add this record to the table. */ 140251881Speter svn_fs_base__str_to_dbt(&value, rep_key); 141251881Speter svn_fs_base__trail_debug(trail, "checksum-reps", "put"); 142251881Speter SVN_ERR(BDB_WRAP(fs, N_("storing checksum-reps record"), 143251881Speter bfd->checksum_reps->put(bfd->checksum_reps, trail->db_txn, 144251881Speter &key, &value, 0))); 145251881Speter return SVN_NO_ERROR; 146251881Speter} 147251881Speter 148251881Spetersvn_error_t *svn_fs_bdb__delete_checksum_rep(svn_fs_t *fs, 149251881Speter svn_checksum_t *checksum, 150251881Speter trail_t *trail, 151251881Speter apr_pool_t *pool) 152251881Speter{ 153251881Speter base_fs_data_t *bfd = fs->fsap_data; 154251881Speter DBT key; 155251881Speter 156251881Speter /* We only allow SHA1 checksums in this table. */ 157251881Speter if (checksum->kind != svn_checksum_sha1) 158251881Speter return svn_error_create(SVN_ERR_BAD_CHECKSUM_KIND, NULL, 159251881Speter _("Only SHA1 checksums can be used as keys in the " 160251881Speter "checksum-reps table.\n")); 161251881Speter 162251881Speter svn_fs_base__checksum_to_dbt(&key, checksum); 163251881Speter svn_fs_base__trail_debug(trail, "checksum-reps", "del"); 164251881Speter SVN_ERR(BDB_WRAP(fs, N_("deleting entry from 'checksum-reps' table"), 165251881Speter bfd->checksum_reps->del(bfd->checksum_reps, 166251881Speter trail->db_txn, &key, 0))); 167251881Speter return SVN_NO_ERROR; 168251881Speter} 169251881Speter 170251881Spetersvn_error_t *svn_fs_bdb__reserve_rep_reuse_id(const char **id_p, 171251881Speter svn_fs_t *fs, 172251881Speter trail_t *trail, 173251881Speter apr_pool_t *pool) 174251881Speter{ 175251881Speter base_fs_data_t *bfd = fs->fsap_data; 176251881Speter DBT query, result; 177251881Speter apr_size_t len; 178251881Speter char next_key[MAX_KEY_SIZE]; 179251881Speter int db_err; 180251881Speter 181251881Speter svn_fs_base__str_to_dbt(&query, NEXT_KEY_KEY); 182251881Speter 183251881Speter /* Get the current value associated with the `next-key' key in the 184251881Speter `checksum-reps' table. */ 185251881Speter svn_fs_base__trail_debug(trail, "checksum-reps", "get"); 186251881Speter SVN_ERR(BDB_WRAP(fs, N_("allocating new representation reuse ID " 187251881Speter "(getting 'next-key')"), 188251881Speter bfd->checksum_reps->get(bfd->checksum_reps, trail->db_txn, 189251881Speter &query, 190251881Speter svn_fs_base__result_dbt(&result), 191251881Speter 0))); 192251881Speter svn_fs_base__track_dbt(&result, pool); 193251881Speter 194251881Speter /* Set our return value. */ 195251881Speter *id_p = apr_pstrmemdup(pool, result.data, result.size); 196251881Speter 197251881Speter /* Bump to future key. */ 198251881Speter len = result.size; 199251881Speter svn_fs_base__next_key(result.data, &len, next_key); 200251881Speter svn_fs_base__trail_debug(trail, "checksum_reps", "put"); 201251881Speter db_err = bfd->checksum_reps->put(bfd->checksum_reps, trail->db_txn, 202251881Speter svn_fs_base__str_to_dbt(&query, 203251881Speter NEXT_KEY_KEY), 204251881Speter svn_fs_base__str_to_dbt(&result, next_key), 205251881Speter 0); 206251881Speter 207251881Speter return BDB_WRAP(fs, N_("bumping next representation reuse ID"), db_err); 208251881Speter} 209