59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _TD_PAGE_FILE_H_
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#define _TD_PAGE_FILE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct __attribute__((__packed__)) {
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char hdrInfo[16]; // info string
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pgsz_t szPage; // page size of current file
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int32_t cno; // commit number counter
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pgno_t freePgno; // freelist page number
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uint8_t resv[100]; // reserved space
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} SPgFileHdr;
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#define TDB_PG_FILE_HDR_SIZE 128
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TDB_STATIC_ASSERT(sizeof(SPgFileHdr) == TDB_PG_FILE_HDR_SIZE, "Page file header size if not 128");
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struct SPgFile {
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TENV * pEnv; // env containing this page file
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char * fname; // backend file name
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uint8_t fileid[TDB_FILE_ID_LEN]; // file id
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pgno_t lsize; // page file logical size (for count)
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pgno_t fsize; // real file size on disk (for rollback)
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TdFilePtr pFile;
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SPgFileListNode envHash;
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SPgFileListNode envPgfList;
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};
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int pgFileOpen(SPgFile **ppPgFile, const char *fname, TENV *pEnv);
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int pgFileClose(SPgFile *pPgFile);
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SPage *pgFileFetch(SPgFile *pPgFile, pgno_t pgno);
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int pgFileRelease(SPage *pPage);
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int pgFileWrite(SPage *pPage);
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int pgFileAllocatePage(SPgFile *pPgFile, pgno_t *pPgno);
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#ifdef __cplusplus
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}
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#endif
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#endif /*_TD_PAGE_FILE_H_*/ |