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2501 lines
58 KiB
2501 lines
58 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2004 |
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* Portions Copyright (C) Christoph Hellwig, 2001-2002 |
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*/ |
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|
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/* |
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* jfs_logmgr.c: log manager |
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* |
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* for related information, see transaction manager (jfs_txnmgr.c), and |
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* recovery manager (jfs_logredo.c). |
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* |
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* note: for detail, RTFS. |
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* |
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* log buffer manager: |
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* special purpose buffer manager supporting log i/o requirements. |
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* per log serial pageout of logpage |
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* queuing i/o requests and redrive i/o at iodone |
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* maintain current logpage buffer |
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* no caching since append only |
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* appropriate jfs buffer cache buffers as needed |
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* |
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* group commit: |
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* transactions which wrote COMMIT records in the same in-memory |
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* log page during the pageout of previous/current log page(s) are |
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* committed together by the pageout of the page. |
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* |
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* TBD lazy commit: |
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* transactions are committed asynchronously when the log page |
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* containing it COMMIT is paged out when it becomes full; |
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* |
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* serialization: |
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* . a per log lock serialize log write. |
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* . a per log lock serialize group commit. |
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* . a per log lock serialize log open/close; |
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* |
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* TBD log integrity: |
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* careful-write (ping-pong) of last logpage to recover from crash |
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* in overwrite. |
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* detection of split (out-of-order) write of physical sectors |
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* of last logpage via timestamp at end of each sector |
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* with its mirror data array at trailer). |
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* |
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* alternatives: |
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* lsn - 64-bit monotonically increasing integer vs |
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* 32-bit lspn and page eor. |
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*/ |
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|
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#include <linux/fs.h> |
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#include <linux/blkdev.h> |
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#include <linux/interrupt.h> |
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#include <linux/completion.h> |
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#include <linux/kthread.h> |
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#include <linux/buffer_head.h> /* for sync_blockdev() */ |
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#include <linux/bio.h> |
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#include <linux/freezer.h> |
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#include <linux/export.h> |
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#include <linux/delay.h> |
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#include <linux/mutex.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include "jfs_incore.h" |
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#include "jfs_filsys.h" |
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#include "jfs_metapage.h" |
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#include "jfs_superblock.h" |
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#include "jfs_txnmgr.h" |
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#include "jfs_debug.h" |
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|
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/* |
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* lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) |
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*/ |
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static struct lbuf *log_redrive_list; |
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static DEFINE_SPINLOCK(log_redrive_lock); |
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|
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/* |
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* log read/write serialization (per log) |
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*/ |
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#define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) |
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#define LOG_LOCK(log) mutex_lock(&((log)->loglock)) |
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#define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock)) |
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/* |
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* log group commit serialization (per log) |
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*/ |
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#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) |
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#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) |
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#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) |
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#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) |
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|
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/* |
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* log sync serialization (per log) |
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*/ |
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#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) |
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#define LOGSYNC_BARRIER(logsize) ((logsize)/4) |
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/* |
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#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) |
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#define LOGSYNC_BARRIER(logsize) ((logsize)/2) |
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*/ |
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|
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/* |
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* log buffer cache synchronization |
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*/ |
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static DEFINE_SPINLOCK(jfsLCacheLock); |
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|
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#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) |
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#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) |
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|
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/* |
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* See __SLEEP_COND in jfs_locks.h |
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*/ |
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#define LCACHE_SLEEP_COND(wq, cond, flags) \ |
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do { \ |
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if (cond) \ |
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break; \ |
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__SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ |
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} while (0) |
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|
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#define LCACHE_WAKEUP(event) wake_up(event) |
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|
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/* |
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* lbuf buffer cache (lCache) control |
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*/ |
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/* log buffer manager pageout control (cumulative, inclusive) */ |
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#define lbmREAD 0x0001 |
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#define lbmWRITE 0x0002 /* enqueue at tail of write queue; |
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* init pageout if at head of queue; |
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*/ |
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#define lbmRELEASE 0x0004 /* remove from write queue |
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* at completion of pageout; |
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* do not free/recycle it yet: |
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* caller will free it; |
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*/ |
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#define lbmSYNC 0x0008 /* do not return to freelist |
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* when removed from write queue; |
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*/ |
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#define lbmFREE 0x0010 /* return to freelist |
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* at completion of pageout; |
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* the buffer may be recycled; |
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*/ |
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#define lbmDONE 0x0020 |
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#define lbmERROR 0x0040 |
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#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing |
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* of log page |
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*/ |
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#define lbmDIRECT 0x0100 |
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|
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/* |
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* Global list of active external journals |
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*/ |
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static LIST_HEAD(jfs_external_logs); |
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static struct jfs_log *dummy_log; |
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static DEFINE_MUTEX(jfs_log_mutex); |
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|
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/* |
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* forward references |
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*/ |
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static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, |
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struct lrd * lrd, struct tlock * tlck); |
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|
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static int lmNextPage(struct jfs_log * log); |
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static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, |
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int activate); |
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|
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static int open_inline_log(struct super_block *sb); |
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static int open_dummy_log(struct super_block *sb); |
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static int lbmLogInit(struct jfs_log * log); |
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static void lbmLogShutdown(struct jfs_log * log); |
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static struct lbuf *lbmAllocate(struct jfs_log * log, int); |
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static void lbmFree(struct lbuf * bp); |
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static void lbmfree(struct lbuf * bp); |
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static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); |
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static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); |
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static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); |
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static int lbmIOWait(struct lbuf * bp, int flag); |
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static bio_end_io_t lbmIODone; |
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static void lbmStartIO(struct lbuf * bp); |
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static void lmGCwrite(struct jfs_log * log, int cant_block); |
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static int lmLogSync(struct jfs_log * log, int hard_sync); |
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|
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/* |
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* statistics |
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*/ |
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#ifdef CONFIG_JFS_STATISTICS |
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static struct lmStat { |
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uint commit; /* # of commit */ |
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uint pagedone; /* # of page written */ |
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uint submitted; /* # of pages submitted */ |
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uint full_page; /* # of full pages submitted */ |
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uint partial_page; /* # of partial pages submitted */ |
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} lmStat; |
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#endif |
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|
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static void write_special_inodes(struct jfs_log *log, |
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int (*writer)(struct address_space *)) |
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{ |
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struct jfs_sb_info *sbi; |
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|
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list_for_each_entry(sbi, &log->sb_list, log_list) { |
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writer(sbi->ipbmap->i_mapping); |
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writer(sbi->ipimap->i_mapping); |
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writer(sbi->direct_inode->i_mapping); |
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} |
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} |
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|
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/* |
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* NAME: lmLog() |
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* |
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* FUNCTION: write a log record; |
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* |
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* PARAMETER: |
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* |
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* RETURN: lsn - offset to the next log record to write (end-of-log); |
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* -1 - error; |
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* |
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* note: todo: log error handler |
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*/ |
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int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, |
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struct tlock * tlck) |
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{ |
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int lsn; |
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int diffp, difft; |
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struct metapage *mp = NULL; |
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unsigned long flags; |
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|
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jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", |
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log, tblk, lrd, tlck); |
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|
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LOG_LOCK(log); |
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/* log by (out-of-transaction) JFS ? */ |
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if (tblk == NULL) |
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goto writeRecord; |
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|
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/* log from page ? */ |
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if (tlck == NULL || |
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tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) |
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goto writeRecord; |
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|
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/* |
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* initialize/update page/transaction recovery lsn |
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*/ |
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lsn = log->lsn; |
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LOGSYNC_LOCK(log, flags); |
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/* |
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* initialize page lsn if first log write of the page |
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*/ |
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if (mp->lsn == 0) { |
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mp->log = log; |
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mp->lsn = lsn; |
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log->count++; |
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/* insert page at tail of logsynclist */ |
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list_add_tail(&mp->synclist, &log->synclist); |
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} |
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/* |
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* initialize/update lsn of tblock of the page |
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* |
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* transaction inherits oldest lsn of pages associated |
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* with allocation/deallocation of resources (their |
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* log records are used to reconstruct allocation map |
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* at recovery time: inode for inode allocation map, |
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* B+-tree index of extent descriptors for block |
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* allocation map); |
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* allocation map pages inherit transaction lsn at |
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* commit time to allow forwarding log syncpt past log |
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* records associated with allocation/deallocation of |
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* resources only after persistent map of these map pages |
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* have been updated and propagated to home. |
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*/ |
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/* |
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* initialize transaction lsn: |
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*/ |
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if (tblk->lsn == 0) { |
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/* inherit lsn of its first page logged */ |
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tblk->lsn = mp->lsn; |
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log->count++; |
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|
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/* insert tblock after the page on logsynclist */ |
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list_add(&tblk->synclist, &mp->synclist); |
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} |
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/* |
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* update transaction lsn: |
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*/ |
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else { |
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/* inherit oldest/smallest lsn of page */ |
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logdiff(diffp, mp->lsn, log); |
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logdiff(difft, tblk->lsn, log); |
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if (diffp < difft) { |
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/* update tblock lsn with page lsn */ |
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tblk->lsn = mp->lsn; |
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|
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/* move tblock after page on logsynclist */ |
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list_move(&tblk->synclist, &mp->synclist); |
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} |
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} |
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LOGSYNC_UNLOCK(log, flags); |
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|
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/* |
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* write the log record |
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*/ |
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writeRecord: |
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lsn = lmWriteRecord(log, tblk, lrd, tlck); |
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|
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/* |
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* forward log syncpt if log reached next syncpt trigger |
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*/ |
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logdiff(diffp, lsn, log); |
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if (diffp >= log->nextsync) |
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lsn = lmLogSync(log, 0); |
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|
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/* update end-of-log lsn */ |
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log->lsn = lsn; |
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LOG_UNLOCK(log); |
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/* return end-of-log address */ |
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return lsn; |
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} |
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|
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/* |
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* NAME: lmWriteRecord() |
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* |
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* FUNCTION: move the log record to current log page |
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* |
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* PARAMETER: cd - commit descriptor |
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* |
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* RETURN: end-of-log address |
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* |
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* serialization: LOG_LOCK() held on entry/exit |
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*/ |
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static int |
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lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, |
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struct tlock * tlck) |
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{ |
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int lsn = 0; /* end-of-log address */ |
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struct lbuf *bp; /* dst log page buffer */ |
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struct logpage *lp; /* dst log page */ |
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caddr_t dst; /* destination address in log page */ |
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int dstoffset; /* end-of-log offset in log page */ |
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int freespace; /* free space in log page */ |
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caddr_t p; /* src meta-data page */ |
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caddr_t src; |
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int srclen; |
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int nbytes; /* number of bytes to move */ |
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int i; |
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int len; |
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struct linelock *linelock; |
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struct lv *lv; |
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struct lvd *lvd; |
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int l2linesize; |
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|
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len = 0; |
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|
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/* retrieve destination log page to write */ |
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bp = (struct lbuf *) log->bp; |
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lp = (struct logpage *) bp->l_ldata; |
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dstoffset = log->eor; |
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|
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/* any log data to write ? */ |
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if (tlck == NULL) |
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goto moveLrd; |
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|
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/* |
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* move log record data |
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*/ |
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/* retrieve source meta-data page to log */ |
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if (tlck->flag & tlckPAGELOCK) { |
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p = (caddr_t) (tlck->mp->data); |
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linelock = (struct linelock *) & tlck->lock; |
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} |
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/* retrieve source in-memory inode to log */ |
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else if (tlck->flag & tlckINODELOCK) { |
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if (tlck->type & tlckDTREE) |
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p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; |
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else |
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p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; |
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linelock = (struct linelock *) & tlck->lock; |
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} |
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#ifdef _JFS_WIP |
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else if (tlck->flag & tlckINLINELOCK) { |
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|
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inlinelock = (struct inlinelock *) & tlck; |
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p = (caddr_t) & inlinelock->pxd; |
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linelock = (struct linelock *) & tlck; |
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} |
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#endif /* _JFS_WIP */ |
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else { |
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jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); |
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return 0; /* Probably should trap */ |
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} |
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l2linesize = linelock->l2linesize; |
|
|
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moveData: |
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ASSERT(linelock->index <= linelock->maxcnt); |
|
|
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lv = linelock->lv; |
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for (i = 0; i < linelock->index; i++, lv++) { |
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if (lv->length == 0) |
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continue; |
|
|
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/* is page full ? */ |
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if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { |
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/* page become full: move on to next page */ |
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lmNextPage(log); |
|
|
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bp = log->bp; |
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lp = (struct logpage *) bp->l_ldata; |
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dstoffset = LOGPHDRSIZE; |
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} |
|
|
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/* |
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* move log vector data |
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*/ |
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src = (u8 *) p + (lv->offset << l2linesize); |
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srclen = lv->length << l2linesize; |
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len += srclen; |
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while (srclen > 0) { |
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freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; |
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nbytes = min(freespace, srclen); |
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dst = (caddr_t) lp + dstoffset; |
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memcpy(dst, src, nbytes); |
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dstoffset += nbytes; |
|
|
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/* is page not full ? */ |
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if (dstoffset < LOGPSIZE - LOGPTLRSIZE) |
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break; |
|
|
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/* page become full: move on to next page */ |
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lmNextPage(log); |
|
|
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bp = (struct lbuf *) log->bp; |
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lp = (struct logpage *) bp->l_ldata; |
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dstoffset = LOGPHDRSIZE; |
|
|
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srclen -= nbytes; |
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src += nbytes; |
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} |
|
|
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/* |
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* move log vector descriptor |
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*/ |
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len += 4; |
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lvd = (struct lvd *) ((caddr_t) lp + dstoffset); |
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lvd->offset = cpu_to_le16(lv->offset); |
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lvd->length = cpu_to_le16(lv->length); |
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dstoffset += 4; |
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jfs_info("lmWriteRecord: lv offset:%d length:%d", |
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lv->offset, lv->length); |
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} |
|
|
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if ((i = linelock->next)) { |
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linelock = (struct linelock *) lid_to_tlock(i); |
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goto moveData; |
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} |
|
|
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/* |
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* move log record descriptor |
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*/ |
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moveLrd: |
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lrd->length = cpu_to_le16(len); |
|
|
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src = (caddr_t) lrd; |
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srclen = LOGRDSIZE; |
|
|
|
while (srclen > 0) { |
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freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; |
|
nbytes = min(freespace, srclen); |
|
dst = (caddr_t) lp + dstoffset; |
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memcpy(dst, src, nbytes); |
|
|
|
dstoffset += nbytes; |
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srclen -= nbytes; |
|
|
|
/* are there more to move than freespace of page ? */ |
|
if (srclen) |
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goto pageFull; |
|
|
|
/* |
|
* end of log record descriptor |
|
*/ |
|
|
|
/* update last log record eor */ |
|
log->eor = dstoffset; |
|
bp->l_eor = dstoffset; |
|
lsn = (log->page << L2LOGPSIZE) + dstoffset; |
|
|
|
if (lrd->type & cpu_to_le16(LOG_COMMIT)) { |
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tblk->clsn = lsn; |
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jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, |
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bp->l_eor); |
|
|
|
INCREMENT(lmStat.commit); /* # of commit */ |
|
|
|
/* |
|
* enqueue tblock for group commit: |
|
* |
|
* enqueue tblock of non-trivial/synchronous COMMIT |
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* at tail of group commit queue |
|
* (trivial/asynchronous COMMITs are ignored by |
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* group commit.) |
|
*/ |
|
LOGGC_LOCK(log); |
|
|
|
/* init tblock gc state */ |
|
tblk->flag = tblkGC_QUEUE; |
|
tblk->bp = log->bp; |
|
tblk->pn = log->page; |
|
tblk->eor = log->eor; |
|
|
|
/* enqueue transaction to commit queue */ |
|
list_add_tail(&tblk->cqueue, &log->cqueue); |
|
|
|
LOGGC_UNLOCK(log); |
|
} |
|
|
|
jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", |
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le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); |
|
|
|
/* page not full ? */ |
|
if (dstoffset < LOGPSIZE - LOGPTLRSIZE) |
|
return lsn; |
|
|
|
pageFull: |
|
/* page become full: move on to next page */ |
|
lmNextPage(log); |
|
|
|
bp = (struct lbuf *) log->bp; |
|
lp = (struct logpage *) bp->l_ldata; |
|
dstoffset = LOGPHDRSIZE; |
|
src += nbytes; |
|
} |
|
|
|
return lsn; |
|
} |
|
|
|
|
|
/* |
|
* NAME: lmNextPage() |
|
* |
|
* FUNCTION: write current page and allocate next page. |
|
* |
|
* PARAMETER: log |
|
* |
|
* RETURN: 0 |
|
* |
|
* serialization: LOG_LOCK() held on entry/exit |
|
*/ |
|
static int lmNextPage(struct jfs_log * log) |
|
{ |
|
struct logpage *lp; |
|
int lspn; /* log sequence page number */ |
|
int pn; /* current page number */ |
|
struct lbuf *bp; |
|
struct lbuf *nextbp; |
|
struct tblock *tblk; |
|
|
|
/* get current log page number and log sequence page number */ |
|
pn = log->page; |
|
bp = log->bp; |
|
lp = (struct logpage *) bp->l_ldata; |
|
lspn = le32_to_cpu(lp->h.page); |
|
|
|
LOGGC_LOCK(log); |
|
|
|
/* |
|
* write or queue the full page at the tail of write queue |
|
*/ |
|
/* get the tail tblk on commit queue */ |
|
if (list_empty(&log->cqueue)) |
|
tblk = NULL; |
|
else |
|
tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); |
|
|
|
/* every tblk who has COMMIT record on the current page, |
|
* and has not been committed, must be on commit queue |
|
* since tblk is queued at commit queueu at the time |
|
* of writing its COMMIT record on the page before |
|
* page becomes full (even though the tblk thread |
|
* who wrote COMMIT record may have been suspended |
|
* currently); |
|
*/ |
|
|
|
/* is page bound with outstanding tail tblk ? */ |
|
if (tblk && tblk->pn == pn) { |
|
/* mark tblk for end-of-page */ |
|
tblk->flag |= tblkGC_EOP; |
|
|
|
if (log->cflag & logGC_PAGEOUT) { |
|
/* if page is not already on write queue, |
|
* just enqueue (no lbmWRITE to prevent redrive) |
|
* buffer to wqueue to ensure correct serial order |
|
* of the pages since log pages will be added |
|
* continuously |
|
*/ |
|
if (bp->l_wqnext == NULL) |
|
lbmWrite(log, bp, 0, 0); |
|
} else { |
|
/* |
|
* No current GC leader, initiate group commit |
|
*/ |
|
log->cflag |= logGC_PAGEOUT; |
|
lmGCwrite(log, 0); |
|
} |
|
} |
|
/* page is not bound with outstanding tblk: |
|
* init write or mark it to be redriven (lbmWRITE) |
|
*/ |
|
else { |
|
/* finalize the page */ |
|
bp->l_ceor = bp->l_eor; |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); |
|
lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); |
|
} |
|
LOGGC_UNLOCK(log); |
|
|
|
/* |
|
* allocate/initialize next page |
|
*/ |
|
/* if log wraps, the first data page of log is 2 |
|
* (0 never used, 1 is superblock). |
|
*/ |
|
log->page = (pn == log->size - 1) ? 2 : pn + 1; |
|
log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ |
|
|
|
/* allocate/initialize next log page buffer */ |
|
nextbp = lbmAllocate(log, log->page); |
|
nextbp->l_eor = log->eor; |
|
log->bp = nextbp; |
|
|
|
/* initialize next log page */ |
|
lp = (struct logpage *) nextbp->l_ldata; |
|
lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); |
|
lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); |
|
|
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* NAME: lmGroupCommit() |
|
* |
|
* FUNCTION: group commit |
|
* initiate pageout of the pages with COMMIT in the order of |
|
* page number - redrive pageout of the page at the head of |
|
* pageout queue until full page has been written. |
|
* |
|
* RETURN: |
|
* |
|
* NOTE: |
|
* LOGGC_LOCK serializes log group commit queue, and |
|
* transaction blocks on the commit queue. |
|
* N.B. LOG_LOCK is NOT held during lmGroupCommit(). |
|
*/ |
|
int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) |
|
{ |
|
int rc = 0; |
|
|
|
LOGGC_LOCK(log); |
|
|
|
/* group committed already ? */ |
|
if (tblk->flag & tblkGC_COMMITTED) { |
|
if (tblk->flag & tblkGC_ERROR) |
|
rc = -EIO; |
|
|
|
LOGGC_UNLOCK(log); |
|
return rc; |
|
} |
|
jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); |
|
|
|
if (tblk->xflag & COMMIT_LAZY) |
|
tblk->flag |= tblkGC_LAZY; |
|
|
|
if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && |
|
(!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) |
|
|| jfs_tlocks_low)) { |
|
/* |
|
* No pageout in progress |
|
* |
|
* start group commit as its group leader. |
|
*/ |
|
log->cflag |= logGC_PAGEOUT; |
|
|
|
lmGCwrite(log, 0); |
|
} |
|
|
|
if (tblk->xflag & COMMIT_LAZY) { |
|
/* |
|
* Lazy transactions can leave now |
|
*/ |
|
LOGGC_UNLOCK(log); |
|
return 0; |
|
} |
|
|
|
/* lmGCwrite gives up LOGGC_LOCK, check again */ |
|
|
|
if (tblk->flag & tblkGC_COMMITTED) { |
|
if (tblk->flag & tblkGC_ERROR) |
|
rc = -EIO; |
|
|
|
LOGGC_UNLOCK(log); |
|
return rc; |
|
} |
|
|
|
/* upcount transaction waiting for completion |
|
*/ |
|
log->gcrtc++; |
|
tblk->flag |= tblkGC_READY; |
|
|
|
__SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), |
|
LOGGC_LOCK(log), LOGGC_UNLOCK(log)); |
|
|
|
/* removed from commit queue */ |
|
if (tblk->flag & tblkGC_ERROR) |
|
rc = -EIO; |
|
|
|
LOGGC_UNLOCK(log); |
|
return rc; |
|
} |
|
|
|
/* |
|
* NAME: lmGCwrite() |
|
* |
|
* FUNCTION: group commit write |
|
* initiate write of log page, building a group of all transactions |
|
* with commit records on that page. |
|
* |
|
* RETURN: None |
|
* |
|
* NOTE: |
|
* LOGGC_LOCK must be held by caller. |
|
* N.B. LOG_LOCK is NOT held during lmGroupCommit(). |
|
*/ |
|
static void lmGCwrite(struct jfs_log * log, int cant_write) |
|
{ |
|
struct lbuf *bp; |
|
struct logpage *lp; |
|
int gcpn; /* group commit page number */ |
|
struct tblock *tblk; |
|
struct tblock *xtblk = NULL; |
|
|
|
/* |
|
* build the commit group of a log page |
|
* |
|
* scan commit queue and make a commit group of all |
|
* transactions with COMMIT records on the same log page. |
|
*/ |
|
/* get the head tblk on the commit queue */ |
|
gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; |
|
|
|
list_for_each_entry(tblk, &log->cqueue, cqueue) { |
|
if (tblk->pn != gcpn) |
|
break; |
|
|
|
xtblk = tblk; |
|
|
|
/* state transition: (QUEUE, READY) -> COMMIT */ |
|
tblk->flag |= tblkGC_COMMIT; |
|
} |
|
tblk = xtblk; /* last tblk of the page */ |
|
|
|
/* |
|
* pageout to commit transactions on the log page. |
|
*/ |
|
bp = (struct lbuf *) tblk->bp; |
|
lp = (struct logpage *) bp->l_ldata; |
|
/* is page already full ? */ |
|
if (tblk->flag & tblkGC_EOP) { |
|
/* mark page to free at end of group commit of the page */ |
|
tblk->flag &= ~tblkGC_EOP; |
|
tblk->flag |= tblkGC_FREE; |
|
bp->l_ceor = bp->l_eor; |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); |
|
lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, |
|
cant_write); |
|
INCREMENT(lmStat.full_page); |
|
} |
|
/* page is not yet full */ |
|
else { |
|
bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); |
|
lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); |
|
INCREMENT(lmStat.partial_page); |
|
} |
|
} |
|
|
|
/* |
|
* NAME: lmPostGC() |
|
* |
|
* FUNCTION: group commit post-processing |
|
* Processes transactions after their commit records have been written |
|
* to disk, redriving log I/O if necessary. |
|
* |
|
* RETURN: None |
|
* |
|
* NOTE: |
|
* This routine is called a interrupt time by lbmIODone |
|
*/ |
|
static void lmPostGC(struct lbuf * bp) |
|
{ |
|
unsigned long flags; |
|
struct jfs_log *log = bp->l_log; |
|
struct logpage *lp; |
|
struct tblock *tblk, *temp; |
|
|
|
//LOGGC_LOCK(log); |
|
spin_lock_irqsave(&log->gclock, flags); |
|
/* |
|
* current pageout of group commit completed. |
|
* |
|
* remove/wakeup transactions from commit queue who were |
|
* group committed with the current log page |
|
*/ |
|
list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { |
|
if (!(tblk->flag & tblkGC_COMMIT)) |
|
break; |
|
/* if transaction was marked GC_COMMIT then |
|
* it has been shipped in the current pageout |
|
* and made it to disk - it is committed. |
|
*/ |
|
|
|
if (bp->l_flag & lbmERROR) |
|
tblk->flag |= tblkGC_ERROR; |
|
|
|
/* remove it from the commit queue */ |
|
list_del(&tblk->cqueue); |
|
tblk->flag &= ~tblkGC_QUEUE; |
|
|
|
if (tblk == log->flush_tblk) { |
|
/* we can stop flushing the log now */ |
|
clear_bit(log_FLUSH, &log->flag); |
|
log->flush_tblk = NULL; |
|
} |
|
|
|
jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, |
|
tblk->flag); |
|
|
|
if (!(tblk->xflag & COMMIT_FORCE)) |
|
/* |
|
* Hand tblk over to lazy commit thread |
|
*/ |
|
txLazyUnlock(tblk); |
|
else { |
|
/* state transition: COMMIT -> COMMITTED */ |
|
tblk->flag |= tblkGC_COMMITTED; |
|
|
|
if (tblk->flag & tblkGC_READY) |
|
log->gcrtc--; |
|
|
|
LOGGC_WAKEUP(tblk); |
|
} |
|
|
|
/* was page full before pageout ? |
|
* (and this is the last tblk bound with the page) |
|
*/ |
|
if (tblk->flag & tblkGC_FREE) |
|
lbmFree(bp); |
|
/* did page become full after pageout ? |
|
* (and this is the last tblk bound with the page) |
|
*/ |
|
else if (tblk->flag & tblkGC_EOP) { |
|
/* finalize the page */ |
|
lp = (struct logpage *) bp->l_ldata; |
|
bp->l_ceor = bp->l_eor; |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); |
|
jfs_info("lmPostGC: calling lbmWrite"); |
|
lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, |
|
1); |
|
} |
|
|
|
} |
|
|
|
/* are there any transactions who have entered lnGroupCommit() |
|
* (whose COMMITs are after that of the last log page written. |
|
* They are waiting for new group commit (above at (SLEEP 1)) |
|
* or lazy transactions are on a full (queued) log page, |
|
* select the latest ready transaction as new group leader and |
|
* wake her up to lead her group. |
|
*/ |
|
if ((!list_empty(&log->cqueue)) && |
|
((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || |
|
test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) |
|
/* |
|
* Call lmGCwrite with new group leader |
|
*/ |
|
lmGCwrite(log, 1); |
|
|
|
/* no transaction are ready yet (transactions are only just |
|
* queued (GC_QUEUE) and not entered for group commit yet). |
|
* the first transaction entering group commit |
|
* will elect herself as new group leader. |
|
*/ |
|
else |
|
log->cflag &= ~logGC_PAGEOUT; |
|
|
|
//LOGGC_UNLOCK(log); |
|
spin_unlock_irqrestore(&log->gclock, flags); |
|
return; |
|
} |
|
|
|
/* |
|
* NAME: lmLogSync() |
|
* |
|
* FUNCTION: write log SYNCPT record for specified log |
|
* if new sync address is available |
|
* (normally the case if sync() is executed by back-ground |
|
* process). |
|
* calculate new value of i_nextsync which determines when |
|
* this code is called again. |
|
* |
|
* PARAMETERS: log - log structure |
|
* hard_sync - 1 to force all metadata to be written |
|
* |
|
* RETURN: 0 |
|
* |
|
* serialization: LOG_LOCK() held on entry/exit |
|
*/ |
|
static int lmLogSync(struct jfs_log * log, int hard_sync) |
|
{ |
|
int logsize; |
|
int written; /* written since last syncpt */ |
|
int free; /* free space left available */ |
|
int delta; /* additional delta to write normally */ |
|
int more; /* additional write granted */ |
|
struct lrd lrd; |
|
int lsn; |
|
struct logsyncblk *lp; |
|
unsigned long flags; |
|
|
|
/* push dirty metapages out to disk */ |
|
if (hard_sync) |
|
write_special_inodes(log, filemap_fdatawrite); |
|
else |
|
write_special_inodes(log, filemap_flush); |
|
|
|
/* |
|
* forward syncpt |
|
*/ |
|
/* if last sync is same as last syncpt, |
|
* invoke sync point forward processing to update sync. |
|
*/ |
|
|
|
if (log->sync == log->syncpt) { |
|
LOGSYNC_LOCK(log, flags); |
|
if (list_empty(&log->synclist)) |
|
log->sync = log->lsn; |
|
else { |
|
lp = list_entry(log->synclist.next, |
|
struct logsyncblk, synclist); |
|
log->sync = lp->lsn; |
|
} |
|
LOGSYNC_UNLOCK(log, flags); |
|
|
|
} |
|
|
|
/* if sync is different from last syncpt, |
|
* write a SYNCPT record with syncpt = sync. |
|
* reset syncpt = sync |
|
*/ |
|
if (log->sync != log->syncpt) { |
|
lrd.logtid = 0; |
|
lrd.backchain = 0; |
|
lrd.type = cpu_to_le16(LOG_SYNCPT); |
|
lrd.length = 0; |
|
lrd.log.syncpt.sync = cpu_to_le32(log->sync); |
|
lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
|
|
|
log->syncpt = log->sync; |
|
} else |
|
lsn = log->lsn; |
|
|
|
/* |
|
* setup next syncpt trigger (SWAG) |
|
*/ |
|
logsize = log->logsize; |
|
|
|
logdiff(written, lsn, log); |
|
free = logsize - written; |
|
delta = LOGSYNC_DELTA(logsize); |
|
more = min(free / 2, delta); |
|
if (more < 2 * LOGPSIZE) { |
|
jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); |
|
/* |
|
* log wrapping |
|
* |
|
* option 1 - panic ? No.! |
|
* option 2 - shutdown file systems |
|
* associated with log ? |
|
* option 3 - extend log ? |
|
* option 4 - second chance |
|
* |
|
* mark log wrapped, and continue. |
|
* when all active transactions are completed, |
|
* mark log valid for recovery. |
|
* if crashed during invalid state, log state |
|
* implies invalid log, forcing fsck(). |
|
*/ |
|
/* mark log state log wrap in log superblock */ |
|
/* log->state = LOGWRAP; */ |
|
|
|
/* reset sync point computation */ |
|
log->syncpt = log->sync = lsn; |
|
log->nextsync = delta; |
|
} else |
|
/* next syncpt trigger = written + more */ |
|
log->nextsync = written + more; |
|
|
|
/* if number of bytes written from last sync point is more |
|
* than 1/4 of the log size, stop new transactions from |
|
* starting until all current transactions are completed |
|
* by setting syncbarrier flag. |
|
*/ |
|
if (!test_bit(log_SYNCBARRIER, &log->flag) && |
|
(written > LOGSYNC_BARRIER(logsize)) && log->active) { |
|
set_bit(log_SYNCBARRIER, &log->flag); |
|
jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, |
|
log->syncpt); |
|
/* |
|
* We may have to initiate group commit |
|
*/ |
|
jfs_flush_journal(log, 0); |
|
} |
|
|
|
return lsn; |
|
} |
|
|
|
/* |
|
* NAME: jfs_syncpt |
|
* |
|
* FUNCTION: write log SYNCPT record for specified log |
|
* |
|
* PARAMETERS: log - log structure |
|
* hard_sync - set to 1 to force metadata to be written |
|
*/ |
|
void jfs_syncpt(struct jfs_log *log, int hard_sync) |
|
{ LOG_LOCK(log); |
|
if (!test_bit(log_QUIESCE, &log->flag)) |
|
lmLogSync(log, hard_sync); |
|
LOG_UNLOCK(log); |
|
} |
|
|
|
/* |
|
* NAME: lmLogOpen() |
|
* |
|
* FUNCTION: open the log on first open; |
|
* insert filesystem in the active list of the log. |
|
* |
|
* PARAMETER: ipmnt - file system mount inode |
|
* iplog - log inode (out) |
|
* |
|
* RETURN: |
|
* |
|
* serialization: |
|
*/ |
|
int lmLogOpen(struct super_block *sb) |
|
{ |
|
int rc; |
|
struct block_device *bdev; |
|
struct jfs_log *log; |
|
struct jfs_sb_info *sbi = JFS_SBI(sb); |
|
|
|
if (sbi->flag & JFS_NOINTEGRITY) |
|
return open_dummy_log(sb); |
|
|
|
if (sbi->mntflag & JFS_INLINELOG) |
|
return open_inline_log(sb); |
|
|
|
mutex_lock(&jfs_log_mutex); |
|
list_for_each_entry(log, &jfs_external_logs, journal_list) { |
|
if (log->bdev->bd_dev == sbi->logdev) { |
|
if (!uuid_equal(&log->uuid, &sbi->loguuid)) { |
|
jfs_warn("wrong uuid on JFS journal"); |
|
mutex_unlock(&jfs_log_mutex); |
|
return -EINVAL; |
|
} |
|
/* |
|
* add file system to log active file system list |
|
*/ |
|
if ((rc = lmLogFileSystem(log, sbi, 1))) { |
|
mutex_unlock(&jfs_log_mutex); |
|
return rc; |
|
} |
|
goto journal_found; |
|
} |
|
} |
|
|
|
if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
|
mutex_unlock(&jfs_log_mutex); |
|
return -ENOMEM; |
|
} |
|
INIT_LIST_HEAD(&log->sb_list); |
|
init_waitqueue_head(&log->syncwait); |
|
|
|
/* |
|
* external log as separate logical volume |
|
* |
|
* file systems to log may have n-to-1 relationship; |
|
*/ |
|
|
|
bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
|
log); |
|
if (IS_ERR(bdev)) { |
|
rc = PTR_ERR(bdev); |
|
goto free; |
|
} |
|
|
|
log->bdev = bdev; |
|
uuid_copy(&log->uuid, &sbi->loguuid); |
|
|
|
/* |
|
* initialize log: |
|
*/ |
|
if ((rc = lmLogInit(log))) |
|
goto close; |
|
|
|
list_add(&log->journal_list, &jfs_external_logs); |
|
|
|
/* |
|
* add file system to log active file system list |
|
*/ |
|
if ((rc = lmLogFileSystem(log, sbi, 1))) |
|
goto shutdown; |
|
|
|
journal_found: |
|
LOG_LOCK(log); |
|
list_add(&sbi->log_list, &log->sb_list); |
|
sbi->log = log; |
|
LOG_UNLOCK(log); |
|
|
|
mutex_unlock(&jfs_log_mutex); |
|
return 0; |
|
|
|
/* |
|
* unwind on error |
|
*/ |
|
shutdown: /* unwind lbmLogInit() */ |
|
list_del(&log->journal_list); |
|
lbmLogShutdown(log); |
|
|
|
close: /* close external log device */ |
|
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
|
|
|
free: /* free log descriptor */ |
|
mutex_unlock(&jfs_log_mutex); |
|
kfree(log); |
|
|
|
jfs_warn("lmLogOpen: exit(%d)", rc); |
|
return rc; |
|
} |
|
|
|
static int open_inline_log(struct super_block *sb) |
|
{ |
|
struct jfs_log *log; |
|
int rc; |
|
|
|
if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
|
return -ENOMEM; |
|
INIT_LIST_HEAD(&log->sb_list); |
|
init_waitqueue_head(&log->syncwait); |
|
|
|
set_bit(log_INLINELOG, &log->flag); |
|
log->bdev = sb->s_bdev; |
|
log->base = addressPXD(&JFS_SBI(sb)->logpxd); |
|
log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> |
|
(L2LOGPSIZE - sb->s_blocksize_bits); |
|
log->l2bsize = sb->s_blocksize_bits; |
|
ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); |
|
|
|
/* |
|
* initialize log. |
|
*/ |
|
if ((rc = lmLogInit(log))) { |
|
kfree(log); |
|
jfs_warn("lmLogOpen: exit(%d)", rc); |
|
return rc; |
|
} |
|
|
|
list_add(&JFS_SBI(sb)->log_list, &log->sb_list); |
|
JFS_SBI(sb)->log = log; |
|
|
|
return rc; |
|
} |
|
|
|
static int open_dummy_log(struct super_block *sb) |
|
{ |
|
int rc; |
|
|
|
mutex_lock(&jfs_log_mutex); |
|
if (!dummy_log) { |
|
dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
|
if (!dummy_log) { |
|
mutex_unlock(&jfs_log_mutex); |
|
return -ENOMEM; |
|
} |
|
INIT_LIST_HEAD(&dummy_log->sb_list); |
|
init_waitqueue_head(&dummy_log->syncwait); |
|
dummy_log->no_integrity = 1; |
|
/* Make up some stuff */ |
|
dummy_log->base = 0; |
|
dummy_log->size = 1024; |
|
rc = lmLogInit(dummy_log); |
|
if (rc) { |
|
kfree(dummy_log); |
|
dummy_log = NULL; |
|
mutex_unlock(&jfs_log_mutex); |
|
return rc; |
|
} |
|
} |
|
|
|
LOG_LOCK(dummy_log); |
|
list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); |
|
JFS_SBI(sb)->log = dummy_log; |
|
LOG_UNLOCK(dummy_log); |
|
mutex_unlock(&jfs_log_mutex); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* NAME: lmLogInit() |
|
* |
|
* FUNCTION: log initialization at first log open. |
|
* |
|
* logredo() (or logformat()) should have been run previously. |
|
* initialize the log from log superblock. |
|
* set the log state in the superblock to LOGMOUNT and |
|
* write SYNCPT log record. |
|
* |
|
* PARAMETER: log - log structure |
|
* |
|
* RETURN: 0 - if ok |
|
* -EINVAL - bad log magic number or superblock dirty |
|
* error returned from logwait() |
|
* |
|
* serialization: single first open thread |
|
*/ |
|
int lmLogInit(struct jfs_log * log) |
|
{ |
|
int rc = 0; |
|
struct lrd lrd; |
|
struct logsuper *logsuper; |
|
struct lbuf *bpsuper; |
|
struct lbuf *bp; |
|
struct logpage *lp; |
|
int lsn = 0; |
|
|
|
jfs_info("lmLogInit: log:0x%p", log); |
|
|
|
/* initialize the group commit serialization lock */ |
|
LOGGC_LOCK_INIT(log); |
|
|
|
/* allocate/initialize the log write serialization lock */ |
|
LOG_LOCK_INIT(log); |
|
|
|
LOGSYNC_LOCK_INIT(log); |
|
|
|
INIT_LIST_HEAD(&log->synclist); |
|
|
|
INIT_LIST_HEAD(&log->cqueue); |
|
log->flush_tblk = NULL; |
|
|
|
log->count = 0; |
|
|
|
/* |
|
* initialize log i/o |
|
*/ |
|
if ((rc = lbmLogInit(log))) |
|
return rc; |
|
|
|
if (!test_bit(log_INLINELOG, &log->flag)) |
|
log->l2bsize = L2LOGPSIZE; |
|
|
|
/* check for disabled journaling to disk */ |
|
if (log->no_integrity) { |
|
/* |
|
* Journal pages will still be filled. When the time comes |
|
* to actually do the I/O, the write is not done, and the |
|
* endio routine is called directly. |
|
*/ |
|
bp = lbmAllocate(log , 0); |
|
log->bp = bp; |
|
bp->l_pn = bp->l_eor = 0; |
|
} else { |
|
/* |
|
* validate log superblock |
|
*/ |
|
if ((rc = lbmRead(log, 1, &bpsuper))) |
|
goto errout10; |
|
|
|
logsuper = (struct logsuper *) bpsuper->l_ldata; |
|
|
|
if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { |
|
jfs_warn("*** Log Format Error ! ***"); |
|
rc = -EINVAL; |
|
goto errout20; |
|
} |
|
|
|
/* logredo() should have been run successfully. */ |
|
if (logsuper->state != cpu_to_le32(LOGREDONE)) { |
|
jfs_warn("*** Log Is Dirty ! ***"); |
|
rc = -EINVAL; |
|
goto errout20; |
|
} |
|
|
|
/* initialize log from log superblock */ |
|
if (test_bit(log_INLINELOG,&log->flag)) { |
|
if (log->size != le32_to_cpu(logsuper->size)) { |
|
rc = -EINVAL; |
|
goto errout20; |
|
} |
|
jfs_info("lmLogInit: inline log:0x%p base:0x%Lx size:0x%x", |
|
log, (unsigned long long)log->base, log->size); |
|
} else { |
|
if (!uuid_equal(&logsuper->uuid, &log->uuid)) { |
|
jfs_warn("wrong uuid on JFS log device"); |
|
rc = -EINVAL; |
|
goto errout20; |
|
} |
|
log->size = le32_to_cpu(logsuper->size); |
|
log->l2bsize = le32_to_cpu(logsuper->l2bsize); |
|
jfs_info("lmLogInit: external log:0x%p base:0x%Lx size:0x%x", |
|
log, (unsigned long long)log->base, log->size); |
|
} |
|
|
|
log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; |
|
log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); |
|
|
|
/* |
|
* initialize for log append write mode |
|
*/ |
|
/* establish current/end-of-log page/buffer */ |
|
if ((rc = lbmRead(log, log->page, &bp))) |
|
goto errout20; |
|
|
|
lp = (struct logpage *) bp->l_ldata; |
|
|
|
jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", |
|
le32_to_cpu(logsuper->end), log->page, log->eor, |
|
le16_to_cpu(lp->h.eor)); |
|
|
|
log->bp = bp; |
|
bp->l_pn = log->page; |
|
bp->l_eor = log->eor; |
|
|
|
/* if current page is full, move on to next page */ |
|
if (log->eor >= LOGPSIZE - LOGPTLRSIZE) |
|
lmNextPage(log); |
|
|
|
/* |
|
* initialize log syncpoint |
|
*/ |
|
/* |
|
* write the first SYNCPT record with syncpoint = 0 |
|
* (i.e., log redo up to HERE !); |
|
* remove current page from lbm write queue at end of pageout |
|
* (to write log superblock update), but do not release to |
|
* freelist; |
|
*/ |
|
lrd.logtid = 0; |
|
lrd.backchain = 0; |
|
lrd.type = cpu_to_le16(LOG_SYNCPT); |
|
lrd.length = 0; |
|
lrd.log.syncpt.sync = 0; |
|
lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
|
bp = log->bp; |
|
bp->l_ceor = bp->l_eor; |
|
lp = (struct logpage *) bp->l_ldata; |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); |
|
lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); |
|
if ((rc = lbmIOWait(bp, 0))) |
|
goto errout30; |
|
|
|
/* |
|
* update/write superblock |
|
*/ |
|
logsuper->state = cpu_to_le32(LOGMOUNT); |
|
log->serial = le32_to_cpu(logsuper->serial) + 1; |
|
logsuper->serial = cpu_to_le32(log->serial); |
|
lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
|
if ((rc = lbmIOWait(bpsuper, lbmFREE))) |
|
goto errout30; |
|
} |
|
|
|
/* initialize logsync parameters */ |
|
log->logsize = (log->size - 2) << L2LOGPSIZE; |
|
log->lsn = lsn; |
|
log->syncpt = lsn; |
|
log->sync = log->syncpt; |
|
log->nextsync = LOGSYNC_DELTA(log->logsize); |
|
|
|
jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", |
|
log->lsn, log->syncpt, log->sync); |
|
|
|
/* |
|
* initialize for lazy/group commit |
|
*/ |
|
log->clsn = lsn; |
|
|
|
return 0; |
|
|
|
/* |
|
* unwind on error |
|
*/ |
|
errout30: /* release log page */ |
|
log->wqueue = NULL; |
|
bp->l_wqnext = NULL; |
|
lbmFree(bp); |
|
|
|
errout20: /* release log superblock */ |
|
lbmFree(bpsuper); |
|
|
|
errout10: /* unwind lbmLogInit() */ |
|
lbmLogShutdown(log); |
|
|
|
jfs_warn("lmLogInit: exit(%d)", rc); |
|
return rc; |
|
} |
|
|
|
|
|
/* |
|
* NAME: lmLogClose() |
|
* |
|
* FUNCTION: remove file system <ipmnt> from active list of log <iplog> |
|
* and close it on last close. |
|
* |
|
* PARAMETER: sb - superblock |
|
* |
|
* RETURN: errors from subroutines |
|
* |
|
* serialization: |
|
*/ |
|
int lmLogClose(struct super_block *sb) |
|
{ |
|
struct jfs_sb_info *sbi = JFS_SBI(sb); |
|
struct jfs_log *log = sbi->log; |
|
struct block_device *bdev; |
|
int rc = 0; |
|
|
|
jfs_info("lmLogClose: log:0x%p", log); |
|
|
|
mutex_lock(&jfs_log_mutex); |
|
LOG_LOCK(log); |
|
list_del(&sbi->log_list); |
|
LOG_UNLOCK(log); |
|
sbi->log = NULL; |
|
|
|
/* |
|
* We need to make sure all of the "written" metapages |
|
* actually make it to disk |
|
*/ |
|
sync_blockdev(sb->s_bdev); |
|
|
|
if (test_bit(log_INLINELOG, &log->flag)) { |
|
/* |
|
* in-line log in host file system |
|
*/ |
|
rc = lmLogShutdown(log); |
|
kfree(log); |
|
goto out; |
|
} |
|
|
|
if (!log->no_integrity) |
|
lmLogFileSystem(log, sbi, 0); |
|
|
|
if (!list_empty(&log->sb_list)) |
|
goto out; |
|
|
|
/* |
|
* TODO: ensure that the dummy_log is in a state to allow |
|
* lbmLogShutdown to deallocate all the buffers and call |
|
* kfree against dummy_log. For now, leave dummy_log & its |
|
* buffers in memory, and resuse if another no-integrity mount |
|
* is requested. |
|
*/ |
|
if (log->no_integrity) |
|
goto out; |
|
|
|
/* |
|
* external log as separate logical volume |
|
*/ |
|
list_del(&log->journal_list); |
|
bdev = log->bdev; |
|
rc = lmLogShutdown(log); |
|
|
|
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
|
|
|
kfree(log); |
|
|
|
out: |
|
mutex_unlock(&jfs_log_mutex); |
|
jfs_info("lmLogClose: exit(%d)", rc); |
|
return rc; |
|
} |
|
|
|
|
|
/* |
|
* NAME: jfs_flush_journal() |
|
* |
|
* FUNCTION: initiate write of any outstanding transactions to the journal |
|
* and optionally wait until they are all written to disk |
|
* |
|
* wait == 0 flush until latest txn is committed, don't wait |
|
* wait == 1 flush until latest txn is committed, wait |
|
* wait > 1 flush until all txn's are complete, wait |
|
*/ |
|
void jfs_flush_journal(struct jfs_log *log, int wait) |
|
{ |
|
int i; |
|
struct tblock *target = NULL; |
|
|
|
/* jfs_write_inode may call us during read-only mount */ |
|
if (!log) |
|
return; |
|
|
|
jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); |
|
|
|
LOGGC_LOCK(log); |
|
|
|
if (!list_empty(&log->cqueue)) { |
|
/* |
|
* This ensures that we will keep writing to the journal as long |
|
* as there are unwritten commit records |
|
*/ |
|
target = list_entry(log->cqueue.prev, struct tblock, cqueue); |
|
|
|
if (test_bit(log_FLUSH, &log->flag)) { |
|
/* |
|
* We're already flushing. |
|
* if flush_tblk is NULL, we are flushing everything, |
|
* so leave it that way. Otherwise, update it to the |
|
* latest transaction |
|
*/ |
|
if (log->flush_tblk) |
|
log->flush_tblk = target; |
|
} else { |
|
/* Only flush until latest transaction is committed */ |
|
log->flush_tblk = target; |
|
set_bit(log_FLUSH, &log->flag); |
|
|
|
/* |
|
* Initiate I/O on outstanding transactions |
|
*/ |
|
if (!(log->cflag & logGC_PAGEOUT)) { |
|
log->cflag |= logGC_PAGEOUT; |
|
lmGCwrite(log, 0); |
|
} |
|
} |
|
} |
|
if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { |
|
/* Flush until all activity complete */ |
|
set_bit(log_FLUSH, &log->flag); |
|
log->flush_tblk = NULL; |
|
} |
|
|
|
if (wait && target && !(target->flag & tblkGC_COMMITTED)) { |
|
DECLARE_WAITQUEUE(__wait, current); |
|
|
|
add_wait_queue(&target->gcwait, &__wait); |
|
set_current_state(TASK_UNINTERRUPTIBLE); |
|
LOGGC_UNLOCK(log); |
|
schedule(); |
|
LOGGC_LOCK(log); |
|
remove_wait_queue(&target->gcwait, &__wait); |
|
} |
|
LOGGC_UNLOCK(log); |
|
|
|
if (wait < 2) |
|
return; |
|
|
|
write_special_inodes(log, filemap_fdatawrite); |
|
|
|
/* |
|
* If there was recent activity, we may need to wait |
|
* for the lazycommit thread to catch up |
|
*/ |
|
if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { |
|
for (i = 0; i < 200; i++) { /* Too much? */ |
|
msleep(250); |
|
write_special_inodes(log, filemap_fdatawrite); |
|
if (list_empty(&log->cqueue) && |
|
list_empty(&log->synclist)) |
|
break; |
|
} |
|
} |
|
assert(list_empty(&log->cqueue)); |
|
|
|
#ifdef CONFIG_JFS_DEBUG |
|
if (!list_empty(&log->synclist)) { |
|
struct logsyncblk *lp; |
|
|
|
printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
|
list_for_each_entry(lp, &log->synclist, synclist) { |
|
if (lp->xflag & COMMIT_PAGE) { |
|
struct metapage *mp = (struct metapage *)lp; |
|
print_hex_dump(KERN_ERR, "metapage: ", |
|
DUMP_PREFIX_ADDRESS, 16, 4, |
|
mp, sizeof(struct metapage), 0); |
|
print_hex_dump(KERN_ERR, "page: ", |
|
DUMP_PREFIX_ADDRESS, 16, |
|
sizeof(long), mp->page, |
|
sizeof(struct page), 0); |
|
} else |
|
print_hex_dump(KERN_ERR, "tblock:", |
|
DUMP_PREFIX_ADDRESS, 16, 4, |
|
lp, sizeof(struct tblock), 0); |
|
} |
|
} |
|
#else |
|
WARN_ON(!list_empty(&log->synclist)); |
|
#endif |
|
clear_bit(log_FLUSH, &log->flag); |
|
} |
|
|
|
/* |
|
* NAME: lmLogShutdown() |
|
* |
|
* FUNCTION: log shutdown at last LogClose(). |
|
* |
|
* write log syncpt record. |
|
* update super block to set redone flag to 0. |
|
* |
|
* PARAMETER: log - log inode |
|
* |
|
* RETURN: 0 - success |
|
* |
|
* serialization: single last close thread |
|
*/ |
|
int lmLogShutdown(struct jfs_log * log) |
|
{ |
|
int rc; |
|
struct lrd lrd; |
|
int lsn; |
|
struct logsuper *logsuper; |
|
struct lbuf *bpsuper; |
|
struct lbuf *bp; |
|
struct logpage *lp; |
|
|
|
jfs_info("lmLogShutdown: log:0x%p", log); |
|
|
|
jfs_flush_journal(log, 2); |
|
|
|
/* |
|
* write the last SYNCPT record with syncpoint = 0 |
|
* (i.e., log redo up to HERE !) |
|
*/ |
|
lrd.logtid = 0; |
|
lrd.backchain = 0; |
|
lrd.type = cpu_to_le16(LOG_SYNCPT); |
|
lrd.length = 0; |
|
lrd.log.syncpt.sync = 0; |
|
|
|
lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
|
bp = log->bp; |
|
lp = (struct logpage *) bp->l_ldata; |
|
lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); |
|
lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); |
|
lbmIOWait(log->bp, lbmFREE); |
|
log->bp = NULL; |
|
|
|
/* |
|
* synchronous update log superblock |
|
* mark log state as shutdown cleanly |
|
* (i.e., Log does not need to be replayed). |
|
*/ |
|
if ((rc = lbmRead(log, 1, &bpsuper))) |
|
goto out; |
|
|
|
logsuper = (struct logsuper *) bpsuper->l_ldata; |
|
logsuper->state = cpu_to_le32(LOGREDONE); |
|
logsuper->end = cpu_to_le32(lsn); |
|
lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
|
rc = lbmIOWait(bpsuper, lbmFREE); |
|
|
|
jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", |
|
lsn, log->page, log->eor); |
|
|
|
out: |
|
/* |
|
* shutdown per log i/o |
|
*/ |
|
lbmLogShutdown(log); |
|
|
|
if (rc) { |
|
jfs_warn("lmLogShutdown: exit(%d)", rc); |
|
} |
|
return rc; |
|
} |
|
|
|
|
|
/* |
|
* NAME: lmLogFileSystem() |
|
* |
|
* FUNCTION: insert (<activate> = true)/remove (<activate> = false) |
|
* file system into/from log active file system list. |
|
* |
|
* PARAMETE: log - pointer to logs inode. |
|
* fsdev - kdev_t of filesystem. |
|
* serial - pointer to returned log serial number |
|
* activate - insert/remove device from active list. |
|
* |
|
* RETURN: 0 - success |
|
* errors returned by vms_iowait(). |
|
*/ |
|
static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, |
|
int activate) |
|
{ |
|
int rc = 0; |
|
int i; |
|
struct logsuper *logsuper; |
|
struct lbuf *bpsuper; |
|
uuid_t *uuid = &sbi->uuid; |
|
|
|
/* |
|
* insert/remove file system device to log active file system list. |
|
*/ |
|
if ((rc = lbmRead(log, 1, &bpsuper))) |
|
return rc; |
|
|
|
logsuper = (struct logsuper *) bpsuper->l_ldata; |
|
if (activate) { |
|
for (i = 0; i < MAX_ACTIVE; i++) |
|
if (uuid_is_null(&logsuper->active[i].uuid)) { |
|
uuid_copy(&logsuper->active[i].uuid, uuid); |
|
sbi->aggregate = i; |
|
break; |
|
} |
|
if (i == MAX_ACTIVE) { |
|
jfs_warn("Too many file systems sharing journal!"); |
|
lbmFree(bpsuper); |
|
return -EMFILE; /* Is there a better rc? */ |
|
} |
|
} else { |
|
for (i = 0; i < MAX_ACTIVE; i++) |
|
if (uuid_equal(&logsuper->active[i].uuid, uuid)) { |
|
uuid_copy(&logsuper->active[i].uuid, |
|
&uuid_null); |
|
break; |
|
} |
|
if (i == MAX_ACTIVE) { |
|
jfs_warn("Somebody stomped on the journal!"); |
|
lbmFree(bpsuper); |
|
return -EIO; |
|
} |
|
|
|
} |
|
|
|
/* |
|
* synchronous write log superblock: |
|
* |
|
* write sidestream bypassing write queue: |
|
* at file system mount, log super block is updated for |
|
* activation of the file system before any log record |
|
* (MOUNT record) of the file system, and at file system |
|
* unmount, all meta data for the file system has been |
|
* flushed before log super block is updated for deactivation |
|
* of the file system. |
|
*/ |
|
lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
|
rc = lbmIOWait(bpsuper, lbmFREE); |
|
|
|
return rc; |
|
} |
|
|
|
/* |
|
* log buffer manager (lbm) |
|
* ------------------------ |
|
* |
|
* special purpose buffer manager supporting log i/o requirements. |
|
* |
|
* per log write queue: |
|
* log pageout occurs in serial order by fifo write queue and |
|
* restricting to a single i/o in pregress at any one time. |
|
* a circular singly-linked list |
|
* (log->wrqueue points to the tail, and buffers are linked via |
|
* bp->wrqueue field), and |
|
* maintains log page in pageout ot waiting for pageout in serial pageout. |
|
*/ |
|
|
|
/* |
|
* lbmLogInit() |
|
* |
|
* initialize per log I/O setup at lmLogInit() |
|
*/ |
|
static int lbmLogInit(struct jfs_log * log) |
|
{ /* log inode */ |
|
int i; |
|
struct lbuf *lbuf; |
|
|
|
jfs_info("lbmLogInit: log:0x%p", log); |
|
|
|
/* initialize current buffer cursor */ |
|
log->bp = NULL; |
|
|
|
/* initialize log device write queue */ |
|
log->wqueue = NULL; |
|
|
|
/* |
|
* Each log has its own buffer pages allocated to it. These are |
|
* not managed by the page cache. This ensures that a transaction |
|
* writing to the log does not block trying to allocate a page from |
|
* the page cache (for the log). This would be bad, since page |
|
* allocation waits on the kswapd thread that may be committing inodes |
|
* which would cause log activity. Was that clear? I'm trying to |
|
* avoid deadlock here. |
|
*/ |
|
init_waitqueue_head(&log->free_wait); |
|
|
|
log->lbuf_free = NULL; |
|
|
|
for (i = 0; i < LOGPAGES;) { |
|
char *buffer; |
|
uint offset; |
|
struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
|
|
|
if (!page) |
|
goto error; |
|
buffer = page_address(page); |
|
for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { |
|
lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); |
|
if (lbuf == NULL) { |
|
if (offset == 0) |
|
__free_page(page); |
|
goto error; |
|
} |
|
if (offset) /* we already have one reference */ |
|
get_page(page); |
|
lbuf->l_offset = offset; |
|
lbuf->l_ldata = buffer + offset; |
|
lbuf->l_page = page; |
|
lbuf->l_log = log; |
|
init_waitqueue_head(&lbuf->l_ioevent); |
|
|
|
lbuf->l_freelist = log->lbuf_free; |
|
log->lbuf_free = lbuf; |
|
i++; |
|
} |
|
} |
|
|
|
return (0); |
|
|
|
error: |
|
lbmLogShutdown(log); |
|
return -ENOMEM; |
|
} |
|
|
|
|
|
/* |
|
* lbmLogShutdown() |
|
* |
|
* finalize per log I/O setup at lmLogShutdown() |
|
*/ |
|
static void lbmLogShutdown(struct jfs_log * log) |
|
{ |
|
struct lbuf *lbuf; |
|
|
|
jfs_info("lbmLogShutdown: log:0x%p", log); |
|
|
|
lbuf = log->lbuf_free; |
|
while (lbuf) { |
|
struct lbuf *next = lbuf->l_freelist; |
|
__free_page(lbuf->l_page); |
|
kfree(lbuf); |
|
lbuf = next; |
|
} |
|
} |
|
|
|
|
|
/* |
|
* lbmAllocate() |
|
* |
|
* allocate an empty log buffer |
|
*/ |
|
static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) |
|
{ |
|
struct lbuf *bp; |
|
unsigned long flags; |
|
|
|
/* |
|
* recycle from log buffer freelist if any |
|
*/ |
|
LCACHE_LOCK(flags); |
|
LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); |
|
log->lbuf_free = bp->l_freelist; |
|
LCACHE_UNLOCK(flags); |
|
|
|
bp->l_flag = 0; |
|
|
|
bp->l_wqnext = NULL; |
|
bp->l_freelist = NULL; |
|
|
|
bp->l_pn = pn; |
|
bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); |
|
bp->l_ceor = 0; |
|
|
|
return bp; |
|
} |
|
|
|
|
|
/* |
|
* lbmFree() |
|
* |
|
* release a log buffer to freelist |
|
*/ |
|
static void lbmFree(struct lbuf * bp) |
|
{ |
|
unsigned long flags; |
|
|
|
LCACHE_LOCK(flags); |
|
|
|
lbmfree(bp); |
|
|
|
LCACHE_UNLOCK(flags); |
|
} |
|
|
|
static void lbmfree(struct lbuf * bp) |
|
{ |
|
struct jfs_log *log = bp->l_log; |
|
|
|
assert(bp->l_wqnext == NULL); |
|
|
|
/* |
|
* return the buffer to head of freelist |
|
*/ |
|
bp->l_freelist = log->lbuf_free; |
|
log->lbuf_free = bp; |
|
|
|
wake_up(&log->free_wait); |
|
return; |
|
} |
|
|
|
|
|
/* |
|
* NAME: lbmRedrive |
|
* |
|
* FUNCTION: add a log buffer to the log redrive list |
|
* |
|
* PARAMETER: |
|
* bp - log buffer |
|
* |
|
* NOTES: |
|
* Takes log_redrive_lock. |
|
*/ |
|
static inline void lbmRedrive(struct lbuf *bp) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&log_redrive_lock, flags); |
|
bp->l_redrive_next = log_redrive_list; |
|
log_redrive_list = bp; |
|
spin_unlock_irqrestore(&log_redrive_lock, flags); |
|
|
|
wake_up_process(jfsIOthread); |
|
} |
|
|
|
|
|
/* |
|
* lbmRead() |
|
*/ |
|
static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) |
|
{ |
|
struct bio *bio; |
|
struct lbuf *bp; |
|
|
|
/* |
|
* allocate a log buffer |
|
*/ |
|
*bpp = bp = lbmAllocate(log, pn); |
|
jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); |
|
|
|
bp->l_flag |= lbmREAD; |
|
|
|
bio = bio_alloc(GFP_NOFS, 1); |
|
|
|
bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
|
bio_set_dev(bio, log->bdev); |
|
|
|
bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
|
BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); |
|
|
|
bio->bi_end_io = lbmIODone; |
|
bio->bi_private = bp; |
|
bio->bi_opf = REQ_OP_READ; |
|
/*check if journaling to disk has been disabled*/ |
|
if (log->no_integrity) { |
|
bio->bi_iter.bi_size = 0; |
|
lbmIODone(bio); |
|
} else { |
|
submit_bio(bio); |
|
} |
|
|
|
wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); |
|
|
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* lbmWrite() |
|
* |
|
* buffer at head of pageout queue stays after completion of |
|
* partial-page pageout and redriven by explicit initiation of |
|
* pageout by caller until full-page pageout is completed and |
|
* released. |
|
* |
|
* device driver i/o done redrives pageout of new buffer at |
|
* head of pageout queue when current buffer at head of pageout |
|
* queue is released at the completion of its full-page pageout. |
|
* |
|
* LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). |
|
* LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() |
|
*/ |
|
static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, |
|
int cant_block) |
|
{ |
|
struct lbuf *tail; |
|
unsigned long flags; |
|
|
|
jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); |
|
|
|
/* map the logical block address to physical block address */ |
|
bp->l_blkno = |
|
log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); |
|
|
|
LCACHE_LOCK(flags); /* disable+lock */ |
|
|
|
/* |
|
* initialize buffer for device driver |
|
*/ |
|
bp->l_flag = flag; |
|
|
|
/* |
|
* insert bp at tail of write queue associated with log |
|
* |
|
* (request is either for bp already/currently at head of queue |
|
* or new bp to be inserted at tail) |
|
*/ |
|
tail = log->wqueue; |
|
|
|
/* is buffer not already on write queue ? */ |
|
if (bp->l_wqnext == NULL) { |
|
/* insert at tail of wqueue */ |
|
if (tail == NULL) { |
|
log->wqueue = bp; |
|
bp->l_wqnext = bp; |
|
} else { |
|
log->wqueue = bp; |
|
bp->l_wqnext = tail->l_wqnext; |
|
tail->l_wqnext = bp; |
|
} |
|
|
|
tail = bp; |
|
} |
|
|
|
/* is buffer at head of wqueue and for write ? */ |
|
if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { |
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
return; |
|
} |
|
|
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
|
|
if (cant_block) |
|
lbmRedrive(bp); |
|
else if (flag & lbmSYNC) |
|
lbmStartIO(bp); |
|
else { |
|
LOGGC_UNLOCK(log); |
|
lbmStartIO(bp); |
|
LOGGC_LOCK(log); |
|
} |
|
} |
|
|
|
|
|
/* |
|
* lbmDirectWrite() |
|
* |
|
* initiate pageout bypassing write queue for sidestream |
|
* (e.g., log superblock) write; |
|
*/ |
|
static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) |
|
{ |
|
jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", |
|
bp, flag, bp->l_pn); |
|
|
|
/* |
|
* initialize buffer for device driver |
|
*/ |
|
bp->l_flag = flag | lbmDIRECT; |
|
|
|
/* map the logical block address to physical block address */ |
|
bp->l_blkno = |
|
log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); |
|
|
|
/* |
|
* initiate pageout of the page |
|
*/ |
|
lbmStartIO(bp); |
|
} |
|
|
|
|
|
/* |
|
* NAME: lbmStartIO() |
|
* |
|
* FUNCTION: Interface to DD strategy routine |
|
* |
|
* RETURN: none |
|
* |
|
* serialization: LCACHE_LOCK() is NOT held during log i/o; |
|
*/ |
|
static void lbmStartIO(struct lbuf * bp) |
|
{ |
|
struct bio *bio; |
|
struct jfs_log *log = bp->l_log; |
|
|
|
jfs_info("lbmStartIO"); |
|
|
|
bio = bio_alloc(GFP_NOFS, 1); |
|
bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
|
bio_set_dev(bio, log->bdev); |
|
|
|
bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
|
BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); |
|
|
|
bio->bi_end_io = lbmIODone; |
|
bio->bi_private = bp; |
|
bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; |
|
|
|
/* check if journaling to disk has been disabled */ |
|
if (log->no_integrity) { |
|
bio->bi_iter.bi_size = 0; |
|
lbmIODone(bio); |
|
} else { |
|
submit_bio(bio); |
|
INCREMENT(lmStat.submitted); |
|
} |
|
} |
|
|
|
|
|
/* |
|
* lbmIOWait() |
|
*/ |
|
static int lbmIOWait(struct lbuf * bp, int flag) |
|
{ |
|
unsigned long flags; |
|
int rc = 0; |
|
|
|
jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); |
|
|
|
LCACHE_LOCK(flags); /* disable+lock */ |
|
|
|
LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); |
|
|
|
rc = (bp->l_flag & lbmERROR) ? -EIO : 0; |
|
|
|
if (flag & lbmFREE) |
|
lbmfree(bp); |
|
|
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
|
|
jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); |
|
return rc; |
|
} |
|
|
|
/* |
|
* lbmIODone() |
|
* |
|
* executed at INTIODONE level |
|
*/ |
|
static void lbmIODone(struct bio *bio) |
|
{ |
|
struct lbuf *bp = bio->bi_private; |
|
struct lbuf *nextbp, *tail; |
|
struct jfs_log *log; |
|
unsigned long flags; |
|
|
|
/* |
|
* get back jfs buffer bound to the i/o buffer |
|
*/ |
|
jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); |
|
|
|
LCACHE_LOCK(flags); /* disable+lock */ |
|
|
|
bp->l_flag |= lbmDONE; |
|
|
|
if (bio->bi_status) { |
|
bp->l_flag |= lbmERROR; |
|
|
|
jfs_err("lbmIODone: I/O error in JFS log"); |
|
} |
|
|
|
bio_put(bio); |
|
|
|
/* |
|
* pagein completion |
|
*/ |
|
if (bp->l_flag & lbmREAD) { |
|
bp->l_flag &= ~lbmREAD; |
|
|
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
|
|
/* wakeup I/O initiator */ |
|
LCACHE_WAKEUP(&bp->l_ioevent); |
|
|
|
return; |
|
} |
|
|
|
/* |
|
* pageout completion |
|
* |
|
* the bp at the head of write queue has completed pageout. |
|
* |
|
* if single-commit/full-page pageout, remove the current buffer |
|
* from head of pageout queue, and redrive pageout with |
|
* the new buffer at head of pageout queue; |
|
* otherwise, the partial-page pageout buffer stays at |
|
* the head of pageout queue to be redriven for pageout |
|
* by lmGroupCommit() until full-page pageout is completed. |
|
*/ |
|
bp->l_flag &= ~lbmWRITE; |
|
INCREMENT(lmStat.pagedone); |
|
|
|
/* update committed lsn */ |
|
log = bp->l_log; |
|
log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; |
|
|
|
if (bp->l_flag & lbmDIRECT) { |
|
LCACHE_WAKEUP(&bp->l_ioevent); |
|
LCACHE_UNLOCK(flags); |
|
return; |
|
} |
|
|
|
tail = log->wqueue; |
|
|
|
/* single element queue */ |
|
if (bp == tail) { |
|
/* remove head buffer of full-page pageout |
|
* from log device write queue |
|
*/ |
|
if (bp->l_flag & lbmRELEASE) { |
|
log->wqueue = NULL; |
|
bp->l_wqnext = NULL; |
|
} |
|
} |
|
/* multi element queue */ |
|
else { |
|
/* remove head buffer of full-page pageout |
|
* from log device write queue |
|
*/ |
|
if (bp->l_flag & lbmRELEASE) { |
|
nextbp = tail->l_wqnext = bp->l_wqnext; |
|
bp->l_wqnext = NULL; |
|
|
|
/* |
|
* redrive pageout of next page at head of write queue: |
|
* redrive next page without any bound tblk |
|
* (i.e., page w/o any COMMIT records), or |
|
* first page of new group commit which has been |
|
* queued after current page (subsequent pageout |
|
* is performed synchronously, except page without |
|
* any COMMITs) by lmGroupCommit() as indicated |
|
* by lbmWRITE flag; |
|
*/ |
|
if (nextbp->l_flag & lbmWRITE) { |
|
/* |
|
* We can't do the I/O at interrupt time. |
|
* The jfsIO thread can do it |
|
*/ |
|
lbmRedrive(nextbp); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* synchronous pageout: |
|
* |
|
* buffer has not necessarily been removed from write queue |
|
* (e.g., synchronous write of partial-page with COMMIT): |
|
* leave buffer for i/o initiator to dispose |
|
*/ |
|
if (bp->l_flag & lbmSYNC) { |
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
|
|
/* wakeup I/O initiator */ |
|
LCACHE_WAKEUP(&bp->l_ioevent); |
|
} |
|
|
|
/* |
|
* Group Commit pageout: |
|
*/ |
|
else if (bp->l_flag & lbmGC) { |
|
LCACHE_UNLOCK(flags); |
|
lmPostGC(bp); |
|
} |
|
|
|
/* |
|
* asynchronous pageout: |
|
* |
|
* buffer must have been removed from write queue: |
|
* insert buffer at head of freelist where it can be recycled |
|
*/ |
|
else { |
|
assert(bp->l_flag & lbmRELEASE); |
|
assert(bp->l_flag & lbmFREE); |
|
lbmfree(bp); |
|
|
|
LCACHE_UNLOCK(flags); /* unlock+enable */ |
|
} |
|
} |
|
|
|
int jfsIOWait(void *arg) |
|
{ |
|
struct lbuf *bp; |
|
|
|
do { |
|
spin_lock_irq(&log_redrive_lock); |
|
while ((bp = log_redrive_list)) { |
|
log_redrive_list = bp->l_redrive_next; |
|
bp->l_redrive_next = NULL; |
|
spin_unlock_irq(&log_redrive_lock); |
|
lbmStartIO(bp); |
|
spin_lock_irq(&log_redrive_lock); |
|
} |
|
|
|
if (freezing(current)) { |
|
spin_unlock_irq(&log_redrive_lock); |
|
try_to_freeze(); |
|
} else { |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
spin_unlock_irq(&log_redrive_lock); |
|
schedule(); |
|
} |
|
} while (!kthread_should_stop()); |
|
|
|
jfs_info("jfsIOWait being killed!"); |
|
return 0; |
|
} |
|
|
|
/* |
|
* NAME: lmLogFormat()/jfs_logform() |
|
* |
|
* FUNCTION: format file system log |
|
* |
|
* PARAMETERS: |
|
* log - volume log |
|
* logAddress - start address of log space in FS block |
|
* logSize - length of log space in FS block; |
|
* |
|
* RETURN: 0 - success |
|
* -EIO - i/o error |
|
* |
|
* XXX: We're synchronously writing one page at a time. This needs to |
|
* be improved by writing multiple pages at once. |
|
*/ |
|
int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) |
|
{ |
|
int rc = -EIO; |
|
struct jfs_sb_info *sbi; |
|
struct logsuper *logsuper; |
|
struct logpage *lp; |
|
int lspn; /* log sequence page number */ |
|
struct lrd *lrd_ptr; |
|
int npages = 0; |
|
struct lbuf *bp; |
|
|
|
jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", |
|
(long long)logAddress, logSize); |
|
|
|
sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); |
|
|
|
/* allocate a log buffer */ |
|
bp = lbmAllocate(log, 1); |
|
|
|
npages = logSize >> sbi->l2nbperpage; |
|
|
|
/* |
|
* log space: |
|
* |
|
* page 0 - reserved; |
|
* page 1 - log superblock; |
|
* page 2 - log data page: A SYNC log record is written |
|
* into this page at logform time; |
|
* pages 3-N - log data page: set to empty log data pages; |
|
*/ |
|
/* |
|
* init log superblock: log page 1 |
|
*/ |
|
logsuper = (struct logsuper *) bp->l_ldata; |
|
|
|
logsuper->magic = cpu_to_le32(LOGMAGIC); |
|
logsuper->version = cpu_to_le32(LOGVERSION); |
|
logsuper->state = cpu_to_le32(LOGREDONE); |
|
logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ |
|
logsuper->size = cpu_to_le32(npages); |
|
logsuper->bsize = cpu_to_le32(sbi->bsize); |
|
logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); |
|
logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); |
|
|
|
bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
|
bp->l_blkno = logAddress + sbi->nbperpage; |
|
lbmStartIO(bp); |
|
if ((rc = lbmIOWait(bp, 0))) |
|
goto exit; |
|
|
|
/* |
|
* init pages 2 to npages-1 as log data pages: |
|
* |
|
* log page sequence number (lpsn) initialization: |
|
* |
|
* pn: 0 1 2 3 n-1 |
|
* +-----+-----+=====+=====+===.....===+=====+ |
|
* lspn: N-1 0 1 N-2 |
|
* <--- N page circular file ----> |
|
* |
|
* the N (= npages-2) data pages of the log is maintained as |
|
* a circular file for the log records; |
|
* lpsn grows by 1 monotonically as each log page is written |
|
* to the circular file of the log; |
|
* and setLogpage() will not reset the page number even if |
|
* the eor is equal to LOGPHDRSIZE. In order for binary search |
|
* still work in find log end process, we have to simulate the |
|
* log wrap situation at the log format time. |
|
* The 1st log page written will have the highest lpsn. Then |
|
* the succeeding log pages will have ascending order of |
|
* the lspn starting from 0, ... (N-2) |
|
*/ |
|
lp = (struct logpage *) bp->l_ldata; |
|
/* |
|
* initialize 1st log page to be written: lpsn = N - 1, |
|
* write a SYNCPT log record is written to this page |
|
*/ |
|
lp->h.page = lp->t.page = cpu_to_le32(npages - 3); |
|
lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); |
|
|
|
lrd_ptr = (struct lrd *) &lp->data; |
|
lrd_ptr->logtid = 0; |
|
lrd_ptr->backchain = 0; |
|
lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); |
|
lrd_ptr->length = 0; |
|
lrd_ptr->log.syncpt.sync = 0; |
|
|
|
bp->l_blkno += sbi->nbperpage; |
|
bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
|
lbmStartIO(bp); |
|
if ((rc = lbmIOWait(bp, 0))) |
|
goto exit; |
|
|
|
/* |
|
* initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) |
|
*/ |
|
for (lspn = 0; lspn < npages - 3; lspn++) { |
|
lp->h.page = lp->t.page = cpu_to_le32(lspn); |
|
lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); |
|
|
|
bp->l_blkno += sbi->nbperpage; |
|
bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
|
lbmStartIO(bp); |
|
if ((rc = lbmIOWait(bp, 0))) |
|
goto exit; |
|
} |
|
|
|
rc = 0; |
|
exit: |
|
/* |
|
* finalize log |
|
*/ |
|
/* release the buffer */ |
|
lbmFree(bp); |
|
|
|
return rc; |
|
} |
|
|
|
#ifdef CONFIG_JFS_STATISTICS |
|
int jfs_lmstats_proc_show(struct seq_file *m, void *v) |
|
{ |
|
seq_printf(m, |
|
"JFS Logmgr stats\n" |
|
"================\n" |
|
"commits = %d\n" |
|
"writes submitted = %d\n" |
|
"writes completed = %d\n" |
|
"full pages submitted = %d\n" |
|
"partial pages submitted = %d\n", |
|
lmStat.commit, |
|
lmStat.submitted, |
|
lmStat.pagedone, |
|
lmStat.full_page, |
|
lmStat.partial_page); |
|
return 0; |
|
} |
|
#endif /* CONFIG_JFS_STATISTICS */
|
|
|