copies-table.c

linux subdivision ying gai ke yi le ba

/* copies-table.c : operations on the `copies' table
 *
 * ====================================================================
 * Copyright (c) 2000-2004 CollabNet.  All rights reserved.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution.  The terms
 * are also available at http://subversion.tigris.org/license-1.html.
 * If newer versions of this license are posted there, you may use a
 * newer version instead, at your option.
 *
 * This software consists of voluntary contributions made by many
 * individuals.  For exact contribution history, see the revision
 * history and logs, available at http://subversion.tigris.org/.
 * ====================================================================
 */

#include <string.h>

#include "bdb_compat.h"
#include "../fs.h"
#include "../err.h"
#include "../key-gen.h"
#include "dbt.h"
#include "../util/skel.h"
#include "../util/fs_skels.h"
#include "../trail.h"
#include "../../libsvn_fs/fs-loader.h"
#include "bdb-err.h"
#include "copies-table.h"
#include "rev-table.h"


int
svn_fs_bdb__open_copies_table (DB **copies_p,
                               DB_ENV *env,
                               svn_boolean_t create)
{
  const u_int32_t open_flags = (create ? (DB_CREATE | DB_EXCL) : 0);
  DB *copies;

  BDB_ERR (svn_fs_bdb__check_version());
  BDB_ERR (db_create (&copies, env, 0));
  BDB_ERR (copies->open (SVN_BDB_OPEN_PARAMS(copies, NULL),
                        "copies", 0, DB_BTREE,
                        open_flags | SVN_BDB_AUTO_COMMIT,
                        0666));

  /* Create the initial `next-id' table entry.  */
  if (create)
  {
    DBT key, value;
    BDB_ERR (copies->put (copies, 0,
                          svn_fs_base__str_to_dbt (&key, NEXT_KEY_KEY),
                          svn_fs_base__str_to_dbt (&value, "0"),
                          SVN_BDB_AUTO_COMMIT));
  }

  *copies_p = copies;
  return 0;
}


/* Store COPY as a copy named COPY_ID in FS as part of TRAIL.  */
/* ### only has one caller; might not need to be abstracted */
static svn_error_t *
put_copy (svn_fs_t *fs,
          const copy_t *copy,
          const char *copy_id,
          trail_t *trail)
{
  base_fs_data_t *bfd = fs->fsap_data;
  skel_t *copy_skel;
  DBT key, value;

  /* Convert native type to skel. */
  SVN_ERR (svn_fs_base__unparse_copy_skel (&copy_skel, copy, trail->pool));

  /* Only in the context of this function do we know that the DB call
     will not attempt to modify COPY_ID, so the cast belongs here.  */
  svn_fs_base__str_to_dbt (&key, copy_id);
  svn_fs_base__skel_to_dbt (&value, copy_skel, trail->pool);
  svn_fs_base__trail_debug (trail, "copies", "put");
  SVN_ERR (BDB_WRAP (fs, "storing copy record",
                     bfd->copies->put (bfd->copies, trail->db_txn,
                                       &key, &value, 0)));

  return SVN_NO_ERROR;
}


svn_error_t *
svn_fs_bdb__reserve_copy_id (const char **id_p,
                             svn_fs_t *fs,
                             trail_t *trail)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBT query, result;
  apr_size_t len;
  char next_key[MAX_KEY_SIZE];
  int db_err;

  svn_fs_base__str_to_dbt (&query, NEXT_KEY_KEY);

  /* Get the current value associated with the `next-id' key in the
     copies table.  */
  svn_fs_base__trail_debug (trail, "copies", "get");
  SVN_ERR (BDB_WRAP (fs, "allocating new copy ID (getting 'next-key')",
                     bfd->copies->get (bfd->copies, trail->db_txn, &query,
                                       svn_fs_base__result_dbt (&result),
                                       0)));
  svn_fs_base__track_dbt (&result, trail->pool);

  /* Set our return value. */
  *id_p = apr_pstrmemdup (trail->pool, result.data, result.size);

  /* Bump to future key. */
  len = result.size;
  svn_fs_base__next_key (result.data, &len, next_key);
  svn_fs_base__trail_debug (trail, "copies", "put");
  db_err = bfd->copies->put (bfd->copies, trail->db_txn,
                             svn_fs_base__str_to_dbt (&query, NEXT_KEY_KEY),
                             svn_fs_base__str_to_dbt (&result, next_key),
                             0);

  SVN_ERR (BDB_WRAP (fs, "bumping next copy key", db_err));
  return SVN_NO_ERROR;
}


svn_error_t *
svn_fs_bdb__create_copy (svn_fs_t *fs,
                         const char *copy_id,
                         const char *src_path,
                         const char *src_txn_id,
                         const svn_fs_id_t *dst_noderev_id,
                         copy_kind_t kind,
                         trail_t *trail)
{
  copy_t copy;
  copy.kind = kind;
  copy.src_path = src_path;
  copy.src_txn_id = src_txn_id;
  copy.dst_noderev_id = dst_noderev_id;
  return put_copy (fs, &copy, copy_id, trail);
}


svn_error_t *
svn_fs_bdb__delete_copy (svn_fs_t *fs,
                         const char *copy_id,
                         trail_t *trail)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBT key;
  int db_err;

  svn_fs_base__str_to_dbt (&key, copy_id);
  svn_fs_base__trail_debug (trail, "copies", "del");
  db_err = bfd->copies->del (bfd->copies, trail->db_txn, &key, 0);
  if (db_err == DB_NOTFOUND)
    return svn_fs_base__err_no_such_copy (fs, copy_id);
  return BDB_WRAP (fs, "deleting entry from 'copies' table", db_err);
}


svn_error_t *
svn_fs_bdb__get_copy (copy_t **copy_p,
                      svn_fs_t *fs,
                      const char *copy_id,
                      trail_t *trail)
{
  base_fs_data_t *bfd = fs->fsap_data;
  DBT key, value;
  int db_err;
  skel_t *skel;
  copy_t *copy;

  /* Only in the context of this function do we know that the DB call
     will not attempt to modify copy_id, so the cast belongs here.  */
  svn_fs_base__trail_debug (trail, "copies", "get");
  db_err = bfd->copies->get (bfd->copies, trail->db_txn,
                             svn_fs_base__str_to_dbt (&key, copy_id),
                             svn_fs_base__result_dbt (&value),
                             0);
  svn_fs_base__track_dbt (&value, trail->pool);

  if (db_err == DB_NOTFOUND)
    return svn_fs_base__err_no_such_copy (fs, copy_id);
  SVN_ERR (BDB_WRAP (fs, "reading copy", db_err));

  /* Unparse COPY skel */
  skel = svn_fs_base__parse_skel (value.data, value.size, trail->pool);
  if (! skel)
    return svn_fs_base__err_corrupt_copy (fs, copy_id);

  /* Convert skel to native type. */
  SVN_ERR (svn_fs_base__parse_copy_skel (&copy, skel, trail->pool));
  *copy_p = copy;
  return SVN_NO_ERROR;
}