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109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 2012 Oracle and/or its affiliates. All rights reserved.
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*
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* $Id$
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*/
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/*
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* This file is based on the template file ex_apprec_template. Note that
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* because ex_apprec_mkdir, like most application-specific recovery functions,
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* does not make use of DB-private structures, it has actually been simplified
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* significantly.
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*/
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#include "db_config.h"
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "db_int.h"
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#include "ex_apprec.h"
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/*
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* ex_apprec_mkdir_recover --
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* Recovery function for mkdir.
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*
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* PUBLIC: int ex_apprec_mkdir_recover
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* PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops));
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*/
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int
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ex_apprec_mkdir_recover(dbenv, dbtp, lsnp, op)
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DB_ENV *dbenv;
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DBT *dbtp;
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DB_LSN *lsnp;
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db_recops op;
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{
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ex_apprec_mkdir_args *argp;
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int ret;
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argp = NULL;
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#ifdef DEBUG_RECOVER
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ex_apprec_mkdir_print(dbenv, dbtp, lsnp, op);
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#endif
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if ((ret = ex_apprec_mkdir_read(dbenv, dbtp->data, &argp)) != 0)
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goto out;
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switch (op) {
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case DB_TXN_ABORT:
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case DB_TXN_BACKWARD_ROLL:
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/*
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* If we're aborting, we need to remove the directory if it
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* exists. We log the trailing zero in pathnames, so we can
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* simply pass the data part of the DBT into rmdir as a string.
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* (Note that we don't have any alignment guarantees, but for
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* a char * this doesn't matter.)
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*
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* Ignore all errors other than ENOENT; DB may attempt to undo
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* or redo operations without knowing whether they have already
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* been done or undone, so we should never assume in a recovery
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* function that the task definitely needs doing or undoing.
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*/
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ret = rmdir(argp->dirname.data);
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if (ret != 0 && errno != ENOENT)
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dbenv->err(dbenv, ret, "Error in abort of mkdir");
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else
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ret = 0;
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break;
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case DB_TXN_FORWARD_ROLL:
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/*
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* The forward direction is just the opposite; here, we ignore
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* EEXIST, because the directory may already exist.
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*/
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ret = mkdir(argp->dirname.data, 0755);
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if (ret != 0 && errno != EEXIST)
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dbenv->err(dbenv,
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ret, "Error in roll-forward of mkdir");
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else
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ret = 0;
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break;
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default:
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/*
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* We might want to handle DB_TXN_PRINT or DB_TXN_APPLY here,
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* too, but we don't try to print the log records and aren't
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* using replication, so there's no need to in this example.
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*/
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dbenv->errx(dbenv, "Unexpected operation type\n");
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return (EINVAL);
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}
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/*
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* The recovery function is responsible for returning the LSN of the
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* previous log record in this transaction, so that transaction aborts
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* can follow the chain backwards.
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*
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* (If we'd wanted the LSN of this record earlier, we could have
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* read it from lsnp, as well--but because we weren't working with
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* pages or other objects that store their LSN and base recovery
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* decisions on it, we didn't need to.)
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*/
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*lsnp = argp->prev_lsn;
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out: if (argp != NULL)
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free(argp);
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return (ret);
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}
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