1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 /* Undo direction. */ 10 /* 11 * exf -- 12 * The file structure. 13 */ 14 struct _exf { 15 int refcnt; /* Reference count. */ 16 17 /* Underlying database state. */ 18 DB *db; /* File db structure. */ 19 CHAR_T *c_lp; /* Cached line. */ 20 size_t c_len; /* Cached line length. */ 21 size_t c_blen; /* Cached line buffer length. */ 22 recno_t c_lno; /* Cached line number. */ 23 recno_t c_nlines; /* Cached lines in the file. */ 24 25 DB *log; /* Log db structure. */ 26 char *l_lp; /* Log buffer. */ 27 size_t l_len; /* Log buffer length. */ 28 recno_t l_high; /* Log last + 1 record number. */ 29 recno_t l_cur; /* Log current record number. */ 30 MARK l_cursor; /* Log cursor position. */ 31 dir_t lundo; /* Last undo direction. */ 32 33 /* Linked list of file MARK's. */ 34 SLIST_HEAD(_markh, _lmark) marks[1]; 35 36 dev_t mdev; /* Device. */ 37 ino_t minode; /* Inode. */ 38 struct timespec mtim; /* Last modification time. */ 39 40 /* 41 * Recovery in general, and these fields specifically, are described 42 * in recover.c. 43 */ 44 #define RCV_PERIOD 120 /* Sync every two minutes. */ 45 char *rcv_path; /* Recover file name. */ 46 char *rcv_mpath; /* Recover mail file name. */ 47 int rcv_fd; /* Locked mail file descriptor. */ 48 49 #define F_DEVSET 0x001 /* mdev/minode fields initialized. */ 50 #define F_FIRSTMODIFY 0x002 /* File not yet modified. */ 51 #define F_MODIFIED 0x004 /* File is currently dirty. */ 52 #define F_MULTILOCK 0x008 /* Multiple processes running, lock. */ 53 #define F_NOLOG 0x010 /* Logging turned off. */ 54 #define F_RCV_NORM 0x020 /* Don't delete recovery files. */ 55 #define F_RCV_ON 0x040 /* Recovery is possible. */ 56 #define F_UNDO 0x080 /* No change since last undo. */ 57 u_int8_t flags; 58 }; 59 60 /* Flags to db_get(). */ 61 #define DBG_FATAL 0x001 /* If DNE, error message. */ 62 #define DBG_NOCACHE 0x002 /* Ignore the front-end cache. */ 63 64 /* Flags to file_init() and file_write(). */ 65 #define FS_ALL 0x001 /* Write the entire file. */ 66 #define FS_APPEND 0x002 /* Append to the file. */ 67 #define FS_FORCE 0x004 /* Force is set. */ 68 #define FS_OPENERR 0x008 /* Open failed, try it again. */ 69 #define FS_POSSIBLE 0x010 /* Force could have been set. */ 70 #define FS_SETALT 0x020 /* Set alternate file name. */ 71 72 /* Flags to rcv_sync(). */ 73 #define RCV_EMAIL 0x01 /* Send the user email, IFF file modified. */ 74 #define RCV_ENDSESSION 0x02 /* End the file session. */ 75 #define RCV_PRESERVE 0x04 /* Preserve backup file, IFF file modified. */ 76 #define RCV_SNAPSHOT 0x08 /* Snapshot the recovery, and send email. */ 77