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/* rep-sharing.c --- the rep-sharing cache for fsfs
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#include "svn_private_config.h"
#include "fs_fs.h"
#include "fs.h"
#include "rep-cache.h"
#include "../libsvn_fs/fs-loader.h"
#include "svn_path.h"
#include "private/svn_sqlite.h"
#include "rep-cache-db.h"
/* A few magic values */
#define REP_CACHE_SCHEMA_FORMAT 1
REP_CACHE_DB_SQL_DECLARE_STATEMENTS(statements);
static svn_error_t *
open_rep_cache(void *baton,
apr_pool_t *pool)
{
svn_fs_t *fs = baton;
fs_fs_data_t *ffd = fs->fsap_data;
const char *db_path;
int version;
/* Open (or create) the sqlite database. It will be automatically
closed when fs->pool is destoyed. */
db_path = svn_dirent_join(fs->path, REP_CACHE_DB_NAME, pool);
SVN_ERR(svn_sqlite__open(&ffd->rep_cache_db, db_path,
svn_sqlite__mode_rwcreate, statements,
0, NULL,
fs->pool, pool));
SVN_ERR(svn_sqlite__read_schema_version(&version, ffd->rep_cache_db, pool));
if (version < REP_CACHE_SCHEMA_FORMAT)
{
/* Must be 0 -- an uninitialized (no schema) database. Create
the schema. Results in schema version of 1. */
SVN_ERR(svn_sqlite__exec_statements(ffd->rep_cache_db,
STMT_CREATE_SCHEMA));
}
return SVN_NO_ERROR;
}
svn_error_t *
svn_fs_fs__open_rep_cache(svn_fs_t *fs,
apr_pool_t *pool)
{
fs_fs_data_t *ffd = fs->fsap_data;
svn_error_t *err = svn_atomic__init_once(&ffd->rep_cache_db_opened,
open_rep_cache, fs, pool);
return svn_error_quick_wrap(err, _("Couldn't open rep-cache database"));
}
/* This function's caller ignores most errors it returns.
If you extend this function, check the callsite to see if you have
to make it not-ignore additional error codes. */
svn_error_t *
svn_fs_fs__get_rep_reference(representation_t **rep,
svn_fs_t *fs,
svn_checksum_t *checksum,
apr_pool_t *pool)
{
fs_fs_data_t *ffd = fs->fsap_data;
svn_sqlite__stmt_t *stmt;
svn_boolean_t have_row;
SVN_ERR_ASSERT(ffd->rep_sharing_allowed);
if (! ffd->rep_cache_db)
SVN_ERR(svn_fs_fs__open_rep_cache(fs, pool));
/* We only allow SHA1 checksums in this table. */
if (checksum->kind != svn_checksum_sha1)
return svn_error_create(SVN_ERR_BAD_CHECKSUM_KIND, NULL,
_("Only SHA1 checksums can be used as keys in the "
"rep_cache table.\n"));
SVN_ERR(svn_sqlite__get_statement(&stmt, ffd->rep_cache_db, STMT_GET_REP));
SVN_ERR(svn_sqlite__bindf(stmt, "s",
svn_checksum_to_cstring(checksum, pool)));
SVN_ERR(svn_sqlite__step(&have_row, stmt));
if (have_row)
{
*rep = apr_pcalloc(pool, sizeof(**rep));
(*rep)->sha1_checksum = svn_checksum_dup(checksum, pool);
(*rep)->revision = svn_sqlite__column_revnum(stmt, 0);
(*rep)->offset = svn_sqlite__column_int64(stmt, 1);
(*rep)->size = svn_sqlite__column_int64(stmt, 2);
(*rep)->expanded_size = svn_sqlite__column_int64(stmt, 3);
}
else
*rep = NULL;
/* Sanity check. */
if (*rep)
{
svn_revnum_t youngest;
youngest = ffd->youngest_rev_cache;
if (youngest < (*rep)->revision)
{
/* Stale cache. */
SVN_ERR(svn_fs_fs__youngest_rev(&youngest, fs, pool));
/* Fresh cache. */
if (youngest < (*rep)->revision)
return svn_error_createf(SVN_ERR_FS_CORRUPT, NULL,
_("Youngest revision is r%ld, but "
"rep-cache contains r%ld"),
youngest, (*rep)->revision);
}
}
return svn_sqlite__reset(stmt);
}
svn_error_t *
svn_fs_fs__set_rep_reference(svn_fs_t *fs,
representation_t *rep,
svn_boolean_t reject_dup,
apr_pool_t *pool)
{
fs_fs_data_t *ffd = fs->fsap_data;
svn_sqlite__stmt_t *stmt;
svn_error_t *err;
SVN_ERR_ASSERT(ffd->rep_sharing_allowed);
if (! ffd->rep_cache_db)
SVN_ERR(svn_fs_fs__open_rep_cache(fs, pool));
/* We only allow SHA1 checksums in this table. */
if (rep->sha1_checksum == NULL)
return svn_error_create(SVN_ERR_BAD_CHECKSUM_KIND, NULL,
_("Only SHA1 checksums can be used as keys in the "
"rep_cache table.\n"));
SVN_ERR(svn_sqlite__get_statement(&stmt, ffd->rep_cache_db, STMT_SET_REP));
SVN_ERR(svn_sqlite__bindf(stmt, "siiii",
svn_checksum_to_cstring(rep->sha1_checksum, pool),
(apr_int64_t) rep->revision,
(apr_int64_t) rep->offset,
(apr_int64_t) rep->size,
(apr_int64_t) rep->expanded_size));
err = svn_sqlite__insert(NULL, stmt);
if (err)
{
representation_t *old_rep;
if (err->apr_err != SVN_ERR_SQLITE_CONSTRAINT)
return svn_error_trace(err);
svn_error_clear(err);
/* Constraint failed so the mapping for SHA1_CHECKSUM->REP
should exist. If so, and the value is the same one we were
about to write, that's cool -- just do nothing. If, however,
the value is *different*, that's a red flag! */
SVN_ERR(svn_fs_fs__get_rep_reference(&old_rep, fs, rep->sha1_checksum,
pool));
if (old_rep)
{
if (reject_dup && ((old_rep->revision != rep->revision)
|| (old_rep->offset != rep->offset)
|| (old_rep->size != rep->size)
|| (old_rep->expanded_size != rep->expanded_size)))
return svn_error_createf(SVN_ERR_FS_CORRUPT, NULL,
apr_psprintf(pool,
_("Representation key for checksum '%%s' exists "
"in filesystem '%%s' with a different value "
"(%%ld,%%%s,%%%s,%%%s) than what we were about "
"to store (%%ld,%%%s,%%%s,%%%s)"),
APR_OFF_T_FMT, SVN_FILESIZE_T_FMT,
SVN_FILESIZE_T_FMT, APR_OFF_T_FMT,
SVN_FILESIZE_T_FMT, SVN_FILESIZE_T_FMT),
svn_checksum_to_cstring_display(rep->sha1_checksum, pool),
fs->path, old_rep->revision, old_rep->offset, old_rep->size,
old_rep->expanded_size, rep->revision, rep->offset, rep->size,
rep->expanded_size);
else
return SVN_NO_ERROR;
}
else
{
/* Something really odd at this point, we failed to insert the
checksum AND failed to read an existing checksum. Do we need
to flag this? */
}
}
return SVN_NO_ERROR;
}
svn_error_t *
svn_fs_fs__del_rep_reference(svn_fs_t *fs,
svn_revnum_t youngest,
apr_pool_t *pool)
{
fs_fs_data_t *ffd = fs->fsap_data;
svn_sqlite__stmt_t *stmt;
SVN_ERR_ASSERT(ffd->format >= SVN_FS_FS__MIN_REP_SHARING_FORMAT);
if (! ffd->rep_cache_db)
SVN_ERR(svn_fs_fs__open_rep_cache(fs, pool));
SVN_ERR(svn_sqlite__get_statement(&stmt, ffd->rep_cache_db,
STMT_DEL_REPS_YOUNGER_THAN_REV));
SVN_ERR(svn_sqlite__bindf(stmt, "r", youngest));
SVN_ERR(svn_sqlite__step_done(stmt));
return SVN_NO_ERROR;
}
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