fop_basic.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:6k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 2001-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: fop_basic.c,v 1.23 2002/08/11 02:11:23 margo Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <string.h>
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "dbinc/log.h"
- #include "dbinc/db_page.h"
- #include "dbinc/fop.h"
- #include "dbinc/txn.h"
- #include "dbinc/db_am.h"
- /*
- * This file implements the basic file-level operations. This code
- * ought to be fairly independent of DB, other than through its
- * error-reporting mechanism.
- */
- /*
- * __fop_create --
- * Create a (transactionally protected) file system object. This is used
- * to create DB files now, potentially blobs, queue extents and anything
- * else you wish to store in a file system object.
- *
- * PUBLIC: int __fop_create __P((DB_ENV *,
- * PUBLIC: DB_TXN *, DB_FH *, const char *, APPNAME, int));
- */
- int
- __fop_create(dbenv, txn, fhp, name, appname, mode)
- DB_ENV *dbenv;
- DB_TXN *txn;
- DB_FH *fhp;
- const char *name;
- APPNAME appname;
- int mode;
- {
- DB_FH fh;
- DB_LSN lsn;
- DBT data;
- char *real_name;
- int do_close, ret;
- ret = 0;
- real_name = NULL;
- if (fhp != NULL)
- do_close = 0;
- else {
- fhp = &fh;
- memset(fhp, 0, sizeof(fh));
- do_close = 1;
- }
- if (mode == 0)
- mode = __db_omode("rw----");
- if ((ret =
- __db_appname(dbenv, appname, name, 0, NULL, &real_name)) != 0)
- goto err;
- if (DBENV_LOGGING(dbenv)) {
- memset(&data, 0, sizeof(data));
- data.data = (void *)name;
- data.size = (u_int32_t)strlen(name) + 1;
- if ((ret = __fop_create_log(dbenv,
- txn, &lsn, DB_FLUSH, &data, (u_int32_t)appname, mode)) != 0)
- goto err;
- }
- DB_ENV_TEST_RECOVERY(dbenv, DB_TEST_POSTLOG, ret, name);
- ret =
- __os_open(dbenv, real_name, DB_OSO_CREATE | DB_OSO_EXCL, mode, fhp);
- err:
- DB_TEST_RECOVERY_LABEL
- if (do_close && F_ISSET(fhp, DB_FH_VALID))
- __os_closehandle(dbenv, fhp);
- if (real_name != NULL)
- __os_free(dbenv, real_name);
- return (ret);
- }
- /*
- * __fop_remove --
- * Remove a file system object.
- *
- * PUBLIC: int __fop_remove __P((DB_ENV *,
- * PUBLIC: DB_TXN *, u_int8_t *, const char *, APPNAME));
- */
- int
- __fop_remove(dbenv, txn, fileid, name, appname)
- DB_ENV *dbenv;
- DB_TXN *txn;
- u_int8_t *fileid;
- const char *name;
- APPNAME appname;
- {
- DB_LSN lsn;
- DBT fdbt, ndbt;
- char *real_name;
- int ret;
- real_name = NULL;
- if ((ret =
- __db_appname(dbenv, appname, name, 0, NULL, &real_name)) != 0)
- goto err;
- if (txn == NULL) {
- if (fileid != NULL && (ret = dbenv->memp_nameop(
- dbenv, fileid, NULL, real_name, NULL)) != 0)
- goto err;
- } else {
- if (DBENV_LOGGING(dbenv)) {
- memset(&fdbt, 0, sizeof(ndbt));
- fdbt.data = fileid;
- fdbt.size = fileid == NULL ? 0 : DB_FILE_ID_LEN;
- memset(&ndbt, 0, sizeof(ndbt));
- ndbt.data = (void *)name;
- ndbt.size = (u_int32_t)strlen(name) + 1;
- if ((ret = __fop_remove_log(dbenv,
- txn, &lsn, 0, &ndbt, &fdbt, appname)) != 0)
- goto err;
- }
- ret = __txn_remevent(dbenv, txn, real_name, fileid);
- }
- err: if (real_name != NULL)
- __os_free(dbenv, real_name);
- return (ret);
- }
- /*
- * __fop_write
- *
- * Write "size" bytes from "buf" to file "name" beginning at offset "off."
- * If the file is open, supply a handle in fhp. Istmp indicate if this is
- * an operation that needs to be undone in the face of failure (i.e., if
- * this is a write to a temporary file, we're simply going to remove the
- * file, so don't worry about undoing the write).
- *
- * Currently, we *only* use this with istmp true. If we need more general
- * handling, then we'll have to zero out regions on abort (and possibly
- * log the before image of the data in the log record).
- *
- * PUBLIC: int __fop_write __P((DB_ENV *, DB_TXN *, const char *, APPNAME,
- * PUBLIC: DB_FH *, u_int32_t, u_int8_t *, u_int32_t, u_int32_t));
- */
- int
- __fop_write(dbenv, txn, name, appname, fhp, off, buf, size, istmp)
- DB_ENV *dbenv;
- DB_TXN *txn;
- const char *name;
- APPNAME appname;
- DB_FH *fhp;
- u_int32_t off;
- u_int8_t *buf;
- u_int32_t size, istmp;
- {
- DB_FH fh;
- DB_LSN lsn;
- DBT data, namedbt;
- char *real_name;
- int ret, t_ret, we_opened;
- size_t nbytes;
- ret = 0;
- we_opened = 0;
- real_name = NULL;
- if ((ret =
- __db_appname(dbenv, appname, name, 0, NULL, &real_name)) != 0)
- goto err;
- if (DBENV_LOGGING(dbenv)) {
- memset(&data, 0, sizeof(data));
- data.data = buf;
- data.size = size;
- memset(&namedbt, 0, sizeof(namedbt));
- namedbt.data = (void *)name;
- namedbt.size = (u_int32_t)strlen(name) + 1;
- if ((ret = __fop_write_log(dbenv,
- txn, &lsn, 0, &namedbt, appname, off, &data, istmp)) != 0)
- goto err;
- }
- if (fhp == NULL) {
- /* File isn't open; we need to reopen it. */
- if ((ret = __os_open(dbenv, real_name, 0, 0, &fh)) != 0)
- goto err;
- fhp = &fh;
- we_opened = 1;
- } else
- we_opened = 0;
- /* Seek to offset. */
- if ((ret = __os_seek(dbenv, fhp, 0, 0, off, 0, DB_OS_SEEK_SET)) != 0)
- goto err;
- /* Now do the write. */
- if ((ret = __os_write(dbenv, fhp, buf, size, &nbytes)) != 0)
- goto err;
- err: if (we_opened)
- if ((t_ret = __os_closehandle(dbenv, fhp)) != 0 && ret == 0)
- ret = t_ret;
- if (real_name != NULL)
- __os_free(dbenv, real_name);
- return (ret);
- }
- /*
- * __fop_rename --
- * Change a file's name.
- *
- * PUBLIC: int __fop_rename __P((DB_ENV *,
- * PUBLIC: DB_TXN *, const char *, const char *, u_int8_t *, APPNAME));
- */
- int
- __fop_rename(dbenv, txn, oldname, newname, fid, appname)
- DB_ENV *dbenv;
- DB_TXN *txn;
- const char *oldname;
- const char *newname;
- u_int8_t *fid;
- APPNAME appname;
- {
- DB_LSN lsn;
- DBT fiddbt, new, old;
- int ret;
- char *n, *o;
- if ((ret = __db_appname(dbenv, appname, oldname, 0, NULL, &o)) != 0)
- goto err;
- if ((ret = __db_appname(dbenv, appname, newname, 0, NULL, &n)) != 0)
- goto err;
- if (DBENV_LOGGING(dbenv)) {
- memset(&old, 0, sizeof(old));
- memset(&new, 0, sizeof(new));
- memset(&fiddbt, 0, sizeof(fiddbt));
- old.data = (void *)oldname;
- old.size = (u_int32_t)strlen(oldname) + 1;
- new.data = (void *)newname;
- new.size = (u_int32_t)strlen(newname) + 1;
- fiddbt.data = fid;
- fiddbt.size = DB_FILE_ID_LEN;
- if ((ret = __fop_rename_log(dbenv, txn, &lsn,
- DB_FLUSH, &old, &new, &fiddbt, (u_int32_t)appname)) != 0)
- goto err;
- }
- ret = dbenv->memp_nameop(dbenv, fid, newname, o, n);
- err: if (o != oldname)
- __os_free(dbenv, o);
- if (n != newname)
- __os_free(dbenv, n);
- return (ret);
- }