- 根目录:
- fs
- jfs
- jfs_logmgr.h
/*
* Copyright (C) International Business Machines Corp., 2000-2004
* Portions Copyright (C) Christoph Hellwig, 2001-2002
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_LOGMGR
#define _H_JFS_LOGMGR
#include "jfs_filsys.h"
#include "jfs_lock.h"
/*
* log manager configuration parameters
*/
/* log page size */
#define LOGPSIZE 4096
#define L2LOGPSIZE 12
#define LOGPAGES 16 /* Log pages per mounted file system */
/*
* log logical volume
*
* a log is used to make the commit operation on journalled
* files within the same logical volume group atomic.
* a log is implemented with a logical volume.
* there is one log per logical volume group.
*
* block 0 of the log logical volume is not used (ipl etc).
* block 1 contains a log "superblock" and is used by logFormat(),
* lmLogInit(), lmLogShutdown(), and logRedo() to record status
* of the log but is not otherwise used during normal processing.
* blocks 2 - (N-1) are used to contain log records.
*
* when a volume group is varied-on-line, logRedo() must have
* been executed before the file systems (logical volumes) in
* the volume group can be mounted.
*/
/*
* log superblock (block 1 of logical volume)
*/
#define LOGSUPER_B 1
#define LOGSTART_B 2
#define LOGMAGIC 0x87654321
#define LOGVERSION 1
#define MAX_ACTIVE 128 /* Max active file systems sharing log */
struct logsuper {
__le32 magic; /* 4: log lv identifier */
__le32 version; /* 4: version number */
__le32 serial; /* 4: log open/mount counter */
__le32 size; /* 4: size in number of LOGPSIZE blocks */
__le32 bsize; /* 4: logical block size in byte */
__le32 l2bsize; /* 4: log2 of bsize */
__le32 flag; /* 4: option */
__le32 state; /* 4: state - see below */
__le32 end; /* 4: addr of last log record set by logredo */
char uuid[16]; /* 16: 128-bit journal uuid */
char label[16]; /* 16: journal label */
struct {
char uuid[16];
} active[MAX_ACTIVE]; /* 2048: active file systems list */
};
#define NULL_UUID "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
/* log flag: commit option (see jfs_filsys.h) */
/* log state */
#define LOGMOUNT 0 /* log mounted by lmLogInit() */
#define LOGREDONE 1 /* log shutdown by lmLogShutdown().
* log redo completed by logredo().
*/
#define LOGWRAP 2 /* log wrapped */
#define LOGREADERR 3 /* log read error detected in logredo() */
/*
* log logical page
*
* (this comment should be rewritten !)
* the header and trailer structures (h,t) will normally have
* the same page and eor value.
* An exception to this occurs when a complete page write is not
* accomplished on a power failure. Since the hardware may "split write"
* sectors in the page, any out of order sequence may occur during powerfail
* and needs to be recognized during log replay. The xor value is
* an "exclusive or" of all log words in the page up to eor. This
* 32 bit eor is stored with the top 16 bits in the header and the
* bottom 16 bits in the trailer. logredo can easily recognize pages
* that were not completed by reconstructing this eor and checking
* the log page.
*
* Previous versions of the operating system did not allow split
* writes and detected partially written records in logredo by
* ordering the updates to the header, trailer, and the move of data
* into the logdata area. The order: (1) data is moved (2) header
* is updated (3) trailer is updated. In logredo, when the header
* differed from the trailer, the header and trailer were reconciled
* as follows: if h.page != t.page they were set to the smaller of
* the two and h.eor and t.eor set to 8 (i.e. empty page). if (only)
* h.eor != t.eor they were set to the smaller of their two values.
*/
struct logpage {
struct { /* header */
__le32 page; /* 4: log sequence page number */
__le16 rsrvd; /* 2: */
__le16 eor; /* 2: end-of-log offset of lasrt record write */
} h;
__le32 data[LOGPSIZE / 4 - 4]; /* log record area */
struct { /* trailer */
__le32 page; /* 4: normally the same as h.page */
__le16 rsrvd; /* 2: */
__le16 eor; /* 2: normally the same as h.eor */
} t;
};
#define LOGPHDRSIZE 8 /* log page header size */
#define LOGPTLRSIZE 8 /* log page trailer size */
/*
* log record
*
* (this comment should be rewritten !)
* jfs uses only "after" log records (only a single writer is allowed
* in a page, pages are written to temporary paging space if
* if they must be written to disk before commit, and i/o is
* scheduled for modified pages to their home location after
* the log records containing the after values and the commit
* record is written to the log on disk, undo discards the copy
* in main-memory.)
*
* a log record consists of a data area of variable length followed by
* a descriptor of fixed size LOGRDSIZE bytes.
* the data area is rounded up to an integral number of 4-bytes and
* must be no longer than LOGPSIZE.
* the descriptor is of size of multiple of 4-bytes and aligned on a
* 4-byte boundary.
* records are packed one after the other in the data area of log pages.
* (sometimes a DUMMY record is inserted so that at least one record ends
* on every page or the longest record is placed on at most two pages).
* the field eor in page header/trailer points to the byte following
* the last record on a page.
*/
/* log record types */
#define LOG_COMMIT 0x8000
#define LOG_SYNCPT 0x4000
#define LOG_MOUNT 0x2000
#define LOG_REDOPAGE 0x0800
#define LOG_NOREDOPAGE 0x0080
#define LOG_NOREDOINOEXT 0x0040
#define LOG_UPDATEMAP 0x0008
#define LOG_NOREDOFILE 0x0001
/* REDOPAGE/NOREDOPAGE log record data type */
#define LOG_INODE 0x0001
#define LOG_XTREE 0x0002
#define LOG_DTREE 0x0004
#define LOG_BTROOT 0x0010
#define LOG_EA 0x0020
#define LOG_ACL 0x0040
#define LOG_DATA 0x0080
#define LOG_NEW 0x0100
#define LOG_EXTEND 0x0200
#define LOG_RELOCATE 0x0400
#define LOG_DIR_XTREE 0x0800 /* Xtree is in directory inode */
/* UPDATEMAP log record descriptor type */
#define LOG_ALLOCXADLIST 0x0080
#define LOG_ALLOCPXDLIST 0x0040
#define LOG_ALLOCXAD 0x0020
#define LOG_ALLOCPXD 0x0010
#define LOG_FREEXADLIST 0x0008
#define LOG_FREEPXDLIST 0x0004
#define LOG_FREEXAD 0x0002
#define LOG_FREEPXD 0x0001
struct lrd {
/*
* type independent area
*/
__le32 logtid; /* 4: log transaction identifier */
__le32 backchain; /* 4: ptr to prev record of same transaction */
__le16 type; /* 2: record type */
__le16 length; /* 2: length of data in record (in byte) */
__le32 aggregate; /* 4: file system lv/aggregate */
/* (16) */
/*
* type dependent area (20)
*/
union {
/*
* COMMIT: commit
*
* transaction commit: no type-dependent information;
*/
/*
* REDOPAGE: after-image
*
* apply after-image;
*
* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 inode; /* 4: inode number */
__le16 type; /* 2: REDOPAGE record type */
__le16 l2linesize; /* 2: log2 of line size */
pxd_t pxd; /* 8: on-disk page pxd */
} redopage; /* (20) */
/*
* NOREDOPAGE: the page is freed
*
* do not apply after-image records which precede this record
* in the log with the same page block number to this page.
*
* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 inode; /* 4: inode number */
__le16 type; /* 2: NOREDOPAGE record type */
__le16 rsrvd; /* 2: reserved */
pxd_t pxd; /* 8: on-disk page pxd */
} noredopage; /* (20) */
/*
* UPDATEMAP: update block allocation map
*
* either in-line PXD,
* or out-of-line XADLIST;
*
* N.B. REDOPAGE, NOREDOPAGE, and UPDATEMAP must be same format;
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 inode; /* 4: inode number */
__le16 type; /* 2: UPDATEMAP record type */
__le16 nxd; /* 2: number of extents */
pxd_t pxd; /* 8: pxd */
} updatemap; /* (20) */
/*
* NOREDOINOEXT: the inode extent is freed
*
* do not apply after-image records which precede this
* record in the log with the any of the 4 page block
* numbers in this inode extent.
*
* NOTE: The fileset and pxd fields MUST remain in
* the same fields in the REDOPAGE record format.
*
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 iagnum; /* 4: IAG number */
__le32 inoext_idx; /* 4: inode extent index */
pxd_t pxd; /* 8: on-disk page pxd */
} noredoinoext; /* (20) */
/*
* SYNCPT: log sync point
*
* replay log up to syncpt address specified;
*/
struct {
__le32 sync; /* 4: syncpt address (0 = here) */
} syncpt;
/*
* MOUNT: file system mount
*
* file system mount: no type-dependent information;
*/
/*
* ? FREEXTENT: free specified extent(s)
*
* free specified extent(s) from block allocation map
* N.B.: nextents should be length of data/sizeof(xad_t)
*/
struct {
__le32 type; /* 4: FREEXTENT record type */
__le32 nextent; /* 4: number of extents */
/* data: PXD or XAD list */
} freextent;
/*
* ? NOREDOFILE: this file is freed
*
* do not apply records which precede this record in the log
* with the same inode number.
*
* NOREDOFILE must be the first to be written at commit
* (last to be read in logredo()) - it prevents
* replay of preceding updates of all preceding generations
* of the inumber esp. the on-disk inode itself.
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 inode; /* 4: inode number */
} noredofile;
/*
* ? NEWPAGE:
*
* metadata type dependent
*/
struct {
__le32 fileset; /* 4: fileset number */
__le32 inode; /* 4: inode number */
__le32 type; /* 4: NEWPAGE record type */
pxd_t pxd; /* 8: on-disk page pxd */
} newpage;
/*
* ? DUMMY: filler
*
* no type-dependent information
*/
} log;
}; /* (36) */
#define LOGRDSIZE (sizeof(struct lrd))
/*
* line vector descriptor
*/
struct lvd {
__le16 offset;
__le16 length;
};
/*
* log logical volume
*/
struct jfs_log {
struct list_head sb_list;/* This is used to sync metadata
* before writing syncpt.
*/
struct list_head journal_list; /* Global list */
struct block_device *bdev; /* 4: log lv pointer */
int serial; /* 4: log mount serial number */
s64 base; /* @8: log extent address (inline log ) */
int size; /* 4: log size in log page (in page) */
int l2bsize; /* 4: log2 of bsize */
unsigned long flag; /* 4: flag */
struct lbuf *lbuf_free; /* 4: free lbufs */
wait_queue_head_t free_wait; /* 4: */
/* log write */
int logtid; /* 4: log tid */
int page; /* 4: page number of eol page */
int eor; /* 4: eor of last record in eol page */
struct lbuf *bp; /* 4: current log page buffer */
struct mutex loglock; /* 4: log write serialization lock */
/* syncpt */
int nextsync; /* 4: bytes to write before next syncpt */
int active; /* 4: */
wait_queue_head_t syncwait; /* 4: */
/* commit */
uint cflag; /* 4: */
struct list_head cqueue; /* FIFO commit queue */
struct tblock *flush_tblk; /* tblk we're waiting on for flush */
int gcrtc; /* 4: GC_READY transaction count */
struct tblock *gclrt; /* 4: latest GC_READY transaction */
spinlock_t gclock; /* 4: group commit lock */
int logsize; /* 4: log data area size in byte */
int lsn; /* 4: end-of-log */
int clsn; /* 4: clsn */
int syncpt; /* 4: addr of last syncpt record */
int sync; /* 4: addr from last logsync() */
struct list_head synclist; /* 8: logsynclist anchor */
spinlock_t synclock; /* 4: synclist lock */
struct lbuf *wqueue; /* 4: log pageout queue */
int count; /* 4: count */
char uuid[16]; /* 16: 128-bit uuid of log device */
int no_integrity; /* 3: flag to disable journaling to disk */
};
/*
* Log flag
*/
#define log_INLINELOG 1
#define log_SYNCBARRIER 2
#define log_QUIESCE 3
#define log_FLUSH 4
/*
* group commit flag
*/
/* jfs_log */
#define logGC_PAGEOUT 0x00000001
/* tblock/lbuf */
#define tblkGC_QUEUE 0x0001
#define tblkGC_READY 0x0002
#define tblkGC_COMMIT 0x0004
#define tblkGC_COMMITTED 0x0008
#define tblkGC_EOP 0x0010
#define tblkGC_FREE 0x0020
#define tblkGC_LEADER 0x0040
#define tblkGC_ERROR 0x0080
#define tblkGC_LAZY 0x0100 // D230860
#define tblkGC_UNLOCKED 0x0200 // D230860
/*
* log cache buffer header
*/
struct lbuf {
struct jfs_log *l_log; /* 4: log associated with buffer */
/*
* data buffer base area
*/
uint l_flag; /* 4: pageout control flags */
struct lbuf *l_wqnext; /* 4: write queue link */
struct lbuf *l_freelist; /* 4: freelistlink */
int l_pn; /* 4: log page number */
int l_eor; /* 4: log record eor */
int l_ceor; /* 4: committed log record eor */
s64 l_blkno; /* 8: log page block number */
caddr_t l_ldata; /* 4: data page */
struct page *l_page; /* The page itself */
uint l_offset; /* Offset of l_ldata within the page */
wait_queue_head_t l_ioevent; /* 4: i/o done event */
};
/* Reuse l_freelist for redrive list */
#define l_redrive_next l_freelist
/*
* logsynclist block
*
* common logsyncblk prefix for jbuf_t and tblock
*/
struct logsyncblk {
u16 xflag; /* flags */
u16 flag; /* only meaninful in tblock */
lid_t lid; /* lock id */
s32 lsn; /* log sequence number */
struct list_head synclist; /* log sync list link */
};
/*
* logsynclist serialization (per log)
*/
#define LOGSYNC_LOCK_INIT(log) spin_lock_init(&(log)->synclock)
#define LOGSYNC_LOCK(log, flags) spin_lock_irqsave(&(log)->synclock, flags)
#define LOGSYNC_UNLOCK(log, flags) \
spin_unlock_irqrestore(&(log)->synclock, flags)
/* compute the difference in bytes of lsn from sync point */
#define logdiff(diff, lsn, log)\
{\
diff = (lsn) - (log)->syncpt;\
if (diff < 0)\
diff += (log)->logsize;\
}
extern int lmLogOpen(struct super_block *sb);
extern int lmLogClose(struct super_block *sb);
extern int lmLogShutdown(struct jfs_log * log);
extern int lmLogInit(struct jfs_log * log);
extern int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize);
extern int lmGroupCommit(struct jfs_log *, struct tblock *);
extern int jfsIOWait(void *);
extern void jfs_flush_journal(struct jfs_log * log, int wait);
extern void jfs_syncpt(struct jfs_log *log, int hard_sync);
#endif /* _H_JFS_LOGMGR */