fs/jfs/jfs_logmgr.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  *   Copyright (C) International Business Machines Corp., 2000-2004
4  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
18 /* log page size */
34  * lmLogInit(), lmLogShutdown(), and logRedo() to record status
36  * blocks 2 - (N-1) are used to contain log records.
38  * when a volume group is varied-on-line, logRedo() must have
57 	__le32 size;		/* 4: size in number of LOGPSIZE blocks */  member
58 	__le32 bsize;		/* 4: logical block size in byte */
62 	__le32 state;		/* 4: state - see below */
64 	__le32 end;		/* 4: addr of last log record set by logredo */
65 	uuid_t uuid;		/* 16: 128-bit journal uuid */
113 		__le16 eor;	/* 2: end-of-log offset of lasrt record write */
116 	__le32 data[LOGPSIZE / 4 - 4];	/* log record area */
125 #define LOGPHDRSIZE	8	/* log page header size */
126 #define LOGPTLRSIZE	8	/* log page trailer size */
130  *	log record
138  * record is written to the log on disk, undo discards the copy
139  * in main-memory.)
141  * a log record consists of a data area of variable length followed by
142  * a descriptor of fixed size LOGRDSIZE bytes.
143  * the data area is rounded up to an integral number of 4-bytes and
145  * the descriptor is of size of multiple of 4-bytes and aligned on a
146  * 4-byte boundary.
148  * (sometimes a DUMMY record is inserted so that at least one record ends
149  * on every page or the longest record is placed on at most two pages).
151  * the last record on a page.
154 /* log record types */
164 /* REDOPAGE/NOREDOPAGE log record data type */
177 /* UPDATEMAP log record descriptor type */
193 	__le32 backchain;	/* 4: ptr to prev record of same transaction */
194 	__le16 type;		/* 2: record type */
195 	__le16 length;		/* 2: length of data in record (in byte) */
207 		 * transaction commit: no type-dependent information;
211 		 *	REDOPAGE: after-image
213 		 * apply after-image;
220 			__le16 type;	/* 2: REDOPAGE record type */
221 			__le16 l2linesize;	/* 2: log2 of line size */
222 			pxd_t pxd;	/* 8: on-disk page pxd */
228 		 * do not apply after-image records which precede this record
236 			__le16 type;	/* 2: NOREDOPAGE record type */
238 			pxd_t pxd;	/* 8: on-disk page pxd */
244 		 * either in-line PXD,
245 		 * or     out-of-line  XADLIST;
252 			__le16 type;	/* 2: UPDATEMAP record type */
260 		 * do not apply after-image records which precede this
261 		 * record in the log with the any of the 4 page block
265 		 *       the same fields in the REDOPAGE record format.
272 			pxd_t pxd;	/* 8: on-disk page pxd */
287 		 * file system mount: no type-dependent information;
297 			__le32 type;	/* 4: FREEXTENT record type */
306 		 * do not apply records which precede this record in the log
310 		 * (last to be read in logredo()) - it prevents
312 		 * of the inumber esp. the on-disk inode itself.
327 			__le32 type;	/* 4: NEWPAGE record type */
328 			pxd_t pxd;	/* 8: on-disk page pxd */
334 		 * no type-dependent information
363 	int size;		/* 4: log size in log page (in page) */  member
374 	int eor;		/* 4: eor of last record in eol page */
391 	int logsize;		/* 4: log data area size in byte */
392 	int lsn;		/* 4: end-of-log */
394 	int syncpt;		/* 4: addr of last syncpt record */
400 	uuid_t uuid;		/* 16: 128-bit uuid of log device */
446 	int l_eor;		/* 4: log record eor */
447 	int l_ceor;		/* 4: committed log record eor */
477 #define LOGSYNC_LOCK_INIT(log) spin_lock_init(&(log)->synclock)
478 #define LOGSYNC_LOCK(log, flags) spin_lock_irqsave(&(log)->synclock, flags)
480 	spin_unlock_irqrestore(&(log)->synclock, flags)
485 	diff = (lsn) - (log)->syncpt;\
487 		diff += (log)->logsize;\