diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/jfs/jfs_txnmgr.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/jfs/jfs_txnmgr.c | 3099 |
1 files changed, 0 insertions, 3099 deletions
diff --git a/ANDROID_3.4.5/fs/jfs/jfs_txnmgr.c b/ANDROID_3.4.5/fs/jfs/jfs_txnmgr.c deleted file mode 100644 index bb8b661b..00000000 --- a/ANDROID_3.4.5/fs/jfs/jfs_txnmgr.c +++ /dev/null @@ -1,3099 +0,0 @@ -/* - * Copyright (C) International Business Machines Corp., 2000-2005 - * 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 - */ - -/* - * jfs_txnmgr.c: transaction manager - * - * notes: - * transaction starts with txBegin() and ends with txCommit() - * or txAbort(). - * - * tlock is acquired at the time of update; - * (obviate scan at commit time for xtree and dtree) - * tlock and mp points to each other; - * (no hashlist for mp -> tlock). - * - * special cases: - * tlock on in-memory inode: - * in-place tlock in the in-memory inode itself; - * converted to page lock by iWrite() at commit time. - * - * tlock during write()/mmap() under anonymous transaction (tid = 0): - * transferred (?) to transaction at commit time. - * - * use the page itself to update allocation maps - * (obviate intermediate replication of allocation/deallocation data) - * hold on to mp+lock thru update of maps - */ - -#include <linux/fs.h> -#include <linux/vmalloc.h> -#include <linux/completion.h> -#include <linux/freezer.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/kthread.h> -#include <linux/seq_file.h> -#include "jfs_incore.h" -#include "jfs_inode.h" -#include "jfs_filsys.h" -#include "jfs_metapage.h" -#include "jfs_dinode.h" -#include "jfs_imap.h" -#include "jfs_dmap.h" -#include "jfs_superblock.h" -#include "jfs_debug.h" - -/* - * transaction management structures - */ -static struct { - int freetid; /* index of a free tid structure */ - int freelock; /* index first free lock word */ - wait_queue_head_t freewait; /* eventlist of free tblock */ - wait_queue_head_t freelockwait; /* eventlist of free tlock */ - wait_queue_head_t lowlockwait; /* eventlist of ample tlocks */ - int tlocksInUse; /* Number of tlocks in use */ - spinlock_t LazyLock; /* synchronize sync_queue & unlock_queue */ -/* struct tblock *sync_queue; * Transactions waiting for data sync */ - struct list_head unlock_queue; /* Txns waiting to be released */ - struct list_head anon_list; /* inodes having anonymous txns */ - struct list_head anon_list2; /* inodes having anonymous txns - that couldn't be sync'ed */ -} TxAnchor; - -int jfs_tlocks_low; /* Indicates low number of available tlocks */ - -#ifdef CONFIG_JFS_STATISTICS -static struct { - uint txBegin; - uint txBegin_barrier; - uint txBegin_lockslow; - uint txBegin_freetid; - uint txBeginAnon; - uint txBeginAnon_barrier; - uint txBeginAnon_lockslow; - uint txLockAlloc; - uint txLockAlloc_freelock; -} TxStat; -#endif - -static int nTxBlock = -1; /* number of transaction blocks */ -module_param(nTxBlock, int, 0); -MODULE_PARM_DESC(nTxBlock, - "Number of transaction blocks (max:65536)"); - -static int nTxLock = -1; /* number of transaction locks */ -module_param(nTxLock, int, 0); -MODULE_PARM_DESC(nTxLock, - "Number of transaction locks (max:65536)"); - -struct tblock *TxBlock; /* transaction block table */ -static int TxLockLWM; /* Low water mark for number of txLocks used */ -static int TxLockHWM; /* High water mark for number of txLocks used */ -static int TxLockVHWM; /* Very High water mark */ -struct tlock *TxLock; /* transaction lock table */ - -/* - * transaction management lock - */ -static DEFINE_SPINLOCK(jfsTxnLock); - -#define TXN_LOCK() spin_lock(&jfsTxnLock) -#define TXN_UNLOCK() spin_unlock(&jfsTxnLock) - -#define LAZY_LOCK_INIT() spin_lock_init(&TxAnchor.LazyLock); -#define LAZY_LOCK(flags) spin_lock_irqsave(&TxAnchor.LazyLock, flags) -#define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags) - -static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait); -static int jfs_commit_thread_waking; - -/* - * Retry logic exist outside these macros to protect from spurrious wakeups. - */ -static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event) -{ - DECLARE_WAITQUEUE(wait, current); - - add_wait_queue(event, &wait); - set_current_state(TASK_UNINTERRUPTIBLE); - TXN_UNLOCK(); - io_schedule(); - __set_current_state(TASK_RUNNING); - remove_wait_queue(event, &wait); -} - -#define TXN_SLEEP(event)\ -{\ - TXN_SLEEP_DROP_LOCK(event);\ - TXN_LOCK();\ -} - -#define TXN_WAKEUP(event) wake_up_all(event) - -/* - * statistics - */ -static struct { - tid_t maxtid; /* 4: biggest tid ever used */ - lid_t maxlid; /* 4: biggest lid ever used */ - int ntid; /* 4: # of transactions performed */ - int nlid; /* 4: # of tlocks acquired */ - int waitlock; /* 4: # of tlock wait */ -} stattx; - -/* - * forward references - */ -static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck, struct commit * cd); -static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck); -static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck); -static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck); -static void txAllocPMap(struct inode *ip, struct maplock * maplock, - struct tblock * tblk); -static void txForce(struct tblock * tblk); -static int txLog(struct jfs_log * log, struct tblock * tblk, - struct commit * cd); -static void txUpdateMap(struct tblock * tblk); -static void txRelease(struct tblock * tblk); -static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck); -static void LogSyncRelease(struct metapage * mp); - -/* - * transaction block/lock management - * --------------------------------- - */ - -/* - * Get a transaction lock from the free list. If the number in use is - * greater than the high water mark, wake up the sync daemon. This should - * free some anonymous transaction locks. (TXN_LOCK must be held.) - */ -static lid_t txLockAlloc(void) -{ - lid_t lid; - - INCREMENT(TxStat.txLockAlloc); - if (!TxAnchor.freelock) { - INCREMENT(TxStat.txLockAlloc_freelock); - } - - while (!(lid = TxAnchor.freelock)) - TXN_SLEEP(&TxAnchor.freelockwait); - TxAnchor.freelock = TxLock[lid].next; - HIGHWATERMARK(stattx.maxlid, lid); - if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) { - jfs_info("txLockAlloc tlocks low"); - jfs_tlocks_low = 1; - wake_up_process(jfsSyncThread); - } - - return lid; -} - -static void txLockFree(lid_t lid) -{ - TxLock[lid].tid = 0; - TxLock[lid].next = TxAnchor.freelock; - TxAnchor.freelock = lid; - TxAnchor.tlocksInUse--; - if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) { - jfs_info("txLockFree jfs_tlocks_low no more"); - jfs_tlocks_low = 0; - TXN_WAKEUP(&TxAnchor.lowlockwait); - } - TXN_WAKEUP(&TxAnchor.freelockwait); -} - -/* - * NAME: txInit() - * - * FUNCTION: initialize transaction management structures - * - * RETURN: - * - * serialization: single thread at jfs_init() - */ -int txInit(void) -{ - int k, size; - struct sysinfo si; - - /* Set defaults for nTxLock and nTxBlock if unset */ - - if (nTxLock == -1) { - if (nTxBlock == -1) { - /* Base default on memory size */ - si_meminfo(&si); - if (si.totalram > (256 * 1024)) /* 1 GB */ - nTxLock = 64 * 1024; - else - nTxLock = si.totalram >> 2; - } else if (nTxBlock > (8 * 1024)) - nTxLock = 64 * 1024; - else - nTxLock = nTxBlock << 3; - } - if (nTxBlock == -1) - nTxBlock = nTxLock >> 3; - - /* Verify tunable parameters */ - if (nTxBlock < 16) - nTxBlock = 16; /* No one should set it this low */ - if (nTxBlock > 65536) - nTxBlock = 65536; - if (nTxLock < 256) - nTxLock = 256; /* No one should set it this low */ - if (nTxLock > 65536) - nTxLock = 65536; - - printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n", - nTxBlock, nTxLock); - /* - * initialize transaction block (tblock) table - * - * transaction id (tid) = tblock index - * tid = 0 is reserved. - */ - TxLockLWM = (nTxLock * 4) / 10; - TxLockHWM = (nTxLock * 7) / 10; - TxLockVHWM = (nTxLock * 8) / 10; - - size = sizeof(struct tblock) * nTxBlock; - TxBlock = vmalloc(size); - if (TxBlock == NULL) - return -ENOMEM; - - for (k = 1; k < nTxBlock - 1; k++) { - TxBlock[k].next = k + 1; - init_waitqueue_head(&TxBlock[k].gcwait); - init_waitqueue_head(&TxBlock[k].waitor); - } - TxBlock[k].next = 0; - init_waitqueue_head(&TxBlock[k].gcwait); - init_waitqueue_head(&TxBlock[k].waitor); - - TxAnchor.freetid = 1; - init_waitqueue_head(&TxAnchor.freewait); - - stattx.maxtid = 1; /* statistics */ - - /* - * initialize transaction lock (tlock) table - * - * transaction lock id = tlock index - * tlock id = 0 is reserved. - */ - size = sizeof(struct tlock) * nTxLock; - TxLock = vmalloc(size); - if (TxLock == NULL) { - vfree(TxBlock); - return -ENOMEM; - } - - /* initialize tlock table */ - for (k = 1; k < nTxLock - 1; k++) - TxLock[k].next = k + 1; - TxLock[k].next = 0; - init_waitqueue_head(&TxAnchor.freelockwait); - init_waitqueue_head(&TxAnchor.lowlockwait); - - TxAnchor.freelock = 1; - TxAnchor.tlocksInUse = 0; - INIT_LIST_HEAD(&TxAnchor.anon_list); - INIT_LIST_HEAD(&TxAnchor.anon_list2); - - LAZY_LOCK_INIT(); - INIT_LIST_HEAD(&TxAnchor.unlock_queue); - - stattx.maxlid = 1; /* statistics */ - - return 0; -} - -/* - * NAME: txExit() - * - * FUNCTION: clean up when module is unloaded - */ -void txExit(void) -{ - vfree(TxLock); - TxLock = NULL; - vfree(TxBlock); - TxBlock = NULL; -} - -/* - * NAME: txBegin() - * - * FUNCTION: start a transaction. - * - * PARAMETER: sb - superblock - * flag - force for nested tx; - * - * RETURN: tid - transaction id - * - * note: flag force allows to start tx for nested tx - * to prevent deadlock on logsync barrier; - */ -tid_t txBegin(struct super_block *sb, int flag) -{ - tid_t t; - struct tblock *tblk; - struct jfs_log *log; - - jfs_info("txBegin: flag = 0x%x", flag); - log = JFS_SBI(sb)->log; - - TXN_LOCK(); - - INCREMENT(TxStat.txBegin); - - retry: - if (!(flag & COMMIT_FORCE)) { - /* - * synchronize with logsync barrier - */ - if (test_bit(log_SYNCBARRIER, &log->flag) || - test_bit(log_QUIESCE, &log->flag)) { - INCREMENT(TxStat.txBegin_barrier); - TXN_SLEEP(&log->syncwait); - goto retry; - } - } - if (flag == 0) { - /* - * Don't begin transaction if we're getting starved for tlocks - * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately - * free tlocks) - */ - if (TxAnchor.tlocksInUse > TxLockVHWM) { - INCREMENT(TxStat.txBegin_lockslow); - TXN_SLEEP(&TxAnchor.lowlockwait); - goto retry; - } - } - - /* - * allocate transaction id/block - */ - if ((t = TxAnchor.freetid) == 0) { - jfs_info("txBegin: waiting for free tid"); - INCREMENT(TxStat.txBegin_freetid); - TXN_SLEEP(&TxAnchor.freewait); - goto retry; - } - - tblk = tid_to_tblock(t); - - if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) { - /* Don't let a non-forced transaction take the last tblk */ - jfs_info("txBegin: waiting for free tid"); - INCREMENT(TxStat.txBegin_freetid); - TXN_SLEEP(&TxAnchor.freewait); - goto retry; - } - - TxAnchor.freetid = tblk->next; - - /* - * initialize transaction - */ - - /* - * We can't zero the whole thing or we screw up another thread being - * awakened after sleeping on tblk->waitor - * - * memset(tblk, 0, sizeof(struct tblock)); - */ - tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0; - - tblk->sb = sb; - ++log->logtid; - tblk->logtid = log->logtid; - - ++log->active; - - HIGHWATERMARK(stattx.maxtid, t); /* statistics */ - INCREMENT(stattx.ntid); /* statistics */ - - TXN_UNLOCK(); - - jfs_info("txBegin: returning tid = %d", t); - - return t; -} - -/* - * NAME: txBeginAnon() - * - * FUNCTION: start an anonymous transaction. - * Blocks if logsync or available tlocks are low to prevent - * anonymous tlocks from depleting supply. - * - * PARAMETER: sb - superblock - * - * RETURN: none - */ -void txBeginAnon(struct super_block *sb) -{ - struct jfs_log *log; - - log = JFS_SBI(sb)->log; - - TXN_LOCK(); - INCREMENT(TxStat.txBeginAnon); - - retry: - /* - * synchronize with logsync barrier - */ - if (test_bit(log_SYNCBARRIER, &log->flag) || - test_bit(log_QUIESCE, &log->flag)) { - INCREMENT(TxStat.txBeginAnon_barrier); - TXN_SLEEP(&log->syncwait); - goto retry; - } - - /* - * Don't begin transaction if we're getting starved for tlocks - */ - if (TxAnchor.tlocksInUse > TxLockVHWM) { - INCREMENT(TxStat.txBeginAnon_lockslow); - TXN_SLEEP(&TxAnchor.lowlockwait); - goto retry; - } - TXN_UNLOCK(); -} - -/* - * txEnd() - * - * function: free specified transaction block. - * - * logsync barrier processing: - * - * serialization: - */ -void txEnd(tid_t tid) -{ - struct tblock *tblk = tid_to_tblock(tid); - struct jfs_log *log; - - jfs_info("txEnd: tid = %d", tid); - TXN_LOCK(); - - /* - * wakeup transactions waiting on the page locked - * by the current transaction - */ - TXN_WAKEUP(&tblk->waitor); - - log = JFS_SBI(tblk->sb)->log; - - /* - * Lazy commit thread can't free this guy until we mark it UNLOCKED, - * otherwise, we would be left with a transaction that may have been - * reused. - * - * Lazy commit thread will turn off tblkGC_LAZY before calling this - * routine. - */ - if (tblk->flag & tblkGC_LAZY) { - jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk); - TXN_UNLOCK(); - - spin_lock_irq(&log->gclock); // LOGGC_LOCK - tblk->flag |= tblkGC_UNLOCKED; - spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK - return; - } - - jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk); - - assert(tblk->next == 0); - - /* - * insert tblock back on freelist - */ - tblk->next = TxAnchor.freetid; - TxAnchor.freetid = tid; - - /* - * mark the tblock not active - */ - if (--log->active == 0) { - clear_bit(log_FLUSH, &log->flag); - - /* - * synchronize with logsync barrier - */ - if (test_bit(log_SYNCBARRIER, &log->flag)) { - TXN_UNLOCK(); - - /* write dirty metadata & forward log syncpt */ - jfs_syncpt(log, 1); - - jfs_info("log barrier off: 0x%x", log->lsn); - - /* enable new transactions start */ - clear_bit(log_SYNCBARRIER, &log->flag); - - /* wakeup all waitors for logsync barrier */ - TXN_WAKEUP(&log->syncwait); - - goto wakeup; - } - } - - TXN_UNLOCK(); -wakeup: - /* - * wakeup all waitors for a free tblock - */ - TXN_WAKEUP(&TxAnchor.freewait); -} - -/* - * txLock() - * - * function: acquire a transaction lock on the specified <mp> - * - * parameter: - * - * return: transaction lock id - * - * serialization: - */ -struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp, - int type) -{ - struct jfs_inode_info *jfs_ip = JFS_IP(ip); - int dir_xtree = 0; - lid_t lid; - tid_t xtid; - struct tlock *tlck; - struct xtlock *xtlck; - struct linelock *linelock; - xtpage_t *p; - struct tblock *tblk; - - TXN_LOCK(); - - if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) && - !(mp->xflag & COMMIT_PAGE)) { - /* - * Directory inode is special. It can have both an xtree tlock - * and a dtree tlock associated with it. - */ - dir_xtree = 1; - lid = jfs_ip->xtlid; - } else - lid = mp->lid; - - /* is page not locked by a transaction ? */ - if (lid == 0) - goto allocateLock; - - jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid); - - /* is page locked by the requester transaction ? */ - tlck = lid_to_tlock(lid); - if ((xtid = tlck->tid) == tid) { - TXN_UNLOCK(); - goto grantLock; - } - - /* - * is page locked by anonymous transaction/lock ? - * - * (page update without transaction (i.e., file write) is - * locked under anonymous transaction tid = 0: - * anonymous tlocks maintained on anonymous tlock list of - * the inode of the page and available to all anonymous - * transactions until txCommit() time at which point - * they are transferred to the transaction tlock list of - * the committing transaction of the inode) - */ - if (xtid == 0) { - tlck->tid = tid; - TXN_UNLOCK(); - tblk = tid_to_tblock(tid); - /* - * The order of the tlocks in the transaction is important - * (during truncate, child xtree pages must be freed before - * parent's tlocks change the working map). - * Take tlock off anonymous list and add to tail of - * transaction list - * - * Note: We really need to get rid of the tid & lid and - * use list_head's. This code is getting UGLY! - */ - if (jfs_ip->atlhead == lid) { - if (jfs_ip->atltail == lid) { - /* only anonymous txn. - * Remove from anon_list - */ - TXN_LOCK(); - list_del_init(&jfs_ip->anon_inode_list); - TXN_UNLOCK(); - } - jfs_ip->atlhead = tlck->next; - } else { - lid_t last; - for (last = jfs_ip->atlhead; - lid_to_tlock(last)->next != lid; - last = lid_to_tlock(last)->next) { - assert(last); - } - lid_to_tlock(last)->next = tlck->next; - if (jfs_ip->atltail == lid) - jfs_ip->atltail = last; - } - - /* insert the tlock at tail of transaction tlock list */ - - if (tblk->next) - lid_to_tlock(tblk->last)->next = lid; - else - tblk->next = lid; - tlck->next = 0; - tblk->last = lid; - - goto grantLock; - } - - goto waitLock; - - /* - * allocate a tlock - */ - allocateLock: - lid = txLockAlloc(); - tlck = lid_to_tlock(lid); - - /* - * initialize tlock - */ - tlck->tid = tid; - - TXN_UNLOCK(); - - /* mark tlock for meta-data page */ - if (mp->xflag & COMMIT_PAGE) { - - tlck->flag = tlckPAGELOCK; - - /* mark the page dirty and nohomeok */ - metapage_nohomeok(mp); - - jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p", - mp, mp->nohomeok, tid, tlck); - - /* if anonymous transaction, and buffer is on the group - * commit synclist, mark inode to show this. This will - * prevent the buffer from being marked nohomeok for too - * long a time. - */ - if ((tid == 0) && mp->lsn) - set_cflag(COMMIT_Synclist, ip); - } - /* mark tlock for in-memory inode */ - else - tlck->flag = tlckINODELOCK; - - if (S_ISDIR(ip->i_mode)) - tlck->flag |= tlckDIRECTORY; - - tlck->type = 0; - - /* bind the tlock and the page */ - tlck->ip = ip; - tlck->mp = mp; - if (dir_xtree) - jfs_ip->xtlid = lid; - else - mp->lid = lid; - - /* - * enqueue transaction lock to transaction/inode - */ - /* insert the tlock at tail of transaction tlock list */ - if (tid) { - tblk = tid_to_tblock(tid); - if (tblk->next) - lid_to_tlock(tblk->last)->next = lid; - else - tblk->next = lid; - tlck->next = 0; - tblk->last = lid; - } - /* anonymous transaction: - * insert the tlock at head of inode anonymous tlock list - */ - else { - tlck->next = jfs_ip->atlhead; - jfs_ip->atlhead = lid; - if (tlck->next == 0) { - /* This inode's first anonymous transaction */ - jfs_ip->atltail = lid; - TXN_LOCK(); - list_add_tail(&jfs_ip->anon_inode_list, - &TxAnchor.anon_list); - TXN_UNLOCK(); - } - } - - /* initialize type dependent area for linelock */ - linelock = (struct linelock *) & tlck->lock; - linelock->next = 0; - linelock->flag = tlckLINELOCK; - linelock->maxcnt = TLOCKSHORT; - linelock->index = 0; - - switch (type & tlckTYPE) { - case tlckDTREE: - linelock->l2linesize = L2DTSLOTSIZE; - break; - - case tlckXTREE: - linelock->l2linesize = L2XTSLOTSIZE; - - xtlck = (struct xtlock *) linelock; - xtlck->header.offset = 0; - xtlck->header.length = 2; - - if (type & tlckNEW) { - xtlck->lwm.offset = XTENTRYSTART; - } else { - if (mp->xflag & COMMIT_PAGE) - p = (xtpage_t *) mp->data; - else - p = &jfs_ip->i_xtroot; - xtlck->lwm.offset = - le16_to_cpu(p->header.nextindex); - } - xtlck->lwm.length = 0; /* ! */ - xtlck->twm.offset = 0; - xtlck->hwm.offset = 0; - - xtlck->index = 2; - break; - - case tlckINODE: - linelock->l2linesize = L2INODESLOTSIZE; - break; - - case tlckDATA: - linelock->l2linesize = L2DATASLOTSIZE; - break; - - default: - jfs_err("UFO tlock:0x%p", tlck); - } - - /* - * update tlock vector - */ - grantLock: - tlck->type |= type; - - return tlck; - - /* - * page is being locked by another transaction: - */ - waitLock: - /* Only locks on ipimap or ipaimap should reach here */ - /* assert(jfs_ip->fileset == AGGREGATE_I); */ - if (jfs_ip->fileset != AGGREGATE_I) { - printk(KERN_ERR "txLock: trying to lock locked page!"); - print_hex_dump(KERN_ERR, "ip: ", DUMP_PREFIX_ADDRESS, 16, 4, - ip, sizeof(*ip), 0); - print_hex_dump(KERN_ERR, "mp: ", DUMP_PREFIX_ADDRESS, 16, 4, - mp, sizeof(*mp), 0); - print_hex_dump(KERN_ERR, "Locker's tblock: ", - DUMP_PREFIX_ADDRESS, 16, 4, tid_to_tblock(tid), - sizeof(struct tblock), 0); - print_hex_dump(KERN_ERR, "Tlock: ", DUMP_PREFIX_ADDRESS, 16, 4, - tlck, sizeof(*tlck), 0); - BUG(); - } - INCREMENT(stattx.waitlock); /* statistics */ - TXN_UNLOCK(); - release_metapage(mp); - TXN_LOCK(); - xtid = tlck->tid; /* reacquire after dropping TXN_LOCK */ - - jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d", - tid, xtid, lid); - - /* Recheck everything since dropping TXN_LOCK */ - if (xtid && (tlck->mp == mp) && (mp->lid == lid)) - TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor); - else - TXN_UNLOCK(); - jfs_info("txLock: awakened tid = %d, lid = %d", tid, lid); - - return NULL; -} - -/* - * NAME: txRelease() - * - * FUNCTION: Release buffers associated with transaction locks, but don't - * mark homeok yet. The allows other transactions to modify - * buffers, but won't let them go to disk until commit record - * actually gets written. - * - * PARAMETER: - * tblk - - * - * RETURN: Errors from subroutines. - */ -static void txRelease(struct tblock * tblk) -{ - struct metapage *mp; - lid_t lid; - struct tlock *tlck; - - TXN_LOCK(); - - for (lid = tblk->next; lid; lid = tlck->next) { - tlck = lid_to_tlock(lid); - if ((mp = tlck->mp) != NULL && - (tlck->type & tlckBTROOT) == 0) { - assert(mp->xflag & COMMIT_PAGE); - mp->lid = 0; - } - } - - /* - * wakeup transactions waiting on a page locked - * by the current transaction - */ - TXN_WAKEUP(&tblk->waitor); - - TXN_UNLOCK(); -} - -/* - * NAME: txUnlock() - * - * FUNCTION: Initiates pageout of pages modified by tid in journalled - * objects and frees their lockwords. - */ -static void txUnlock(struct tblock * tblk) -{ - struct tlock *tlck; - struct linelock *linelock; - lid_t lid, next, llid, k; - struct metapage *mp; - struct jfs_log *log; - int difft, diffp; - unsigned long flags; - - jfs_info("txUnlock: tblk = 0x%p", tblk); - log = JFS_SBI(tblk->sb)->log; - - /* - * mark page under tlock homeok (its log has been written): - */ - for (lid = tblk->next; lid; lid = next) { - tlck = lid_to_tlock(lid); - next = tlck->next; - - jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck); - - /* unbind page from tlock */ - if ((mp = tlck->mp) != NULL && - (tlck->type & tlckBTROOT) == 0) { - assert(mp->xflag & COMMIT_PAGE); - - /* hold buffer - */ - hold_metapage(mp); - - assert(mp->nohomeok > 0); - _metapage_homeok(mp); - - /* inherit younger/larger clsn */ - LOGSYNC_LOCK(log, flags); - if (mp->clsn) { - logdiff(difft, tblk->clsn, log); - logdiff(diffp, mp->clsn, log); - if (difft > diffp) - mp->clsn = tblk->clsn; - } else - mp->clsn = tblk->clsn; - LOGSYNC_UNLOCK(log, flags); - - assert(!(tlck->flag & tlckFREEPAGE)); - - put_metapage(mp); - } - - /* insert tlock, and linelock(s) of the tlock if any, - * at head of freelist - */ - TXN_LOCK(); - - llid = ((struct linelock *) & tlck->lock)->next; - while (llid) { - linelock = (struct linelock *) lid_to_tlock(llid); - k = linelock->next; - txLockFree(llid); - llid = k; - } - txLockFree(lid); - - TXN_UNLOCK(); - } - tblk->next = tblk->last = 0; - - /* - * remove tblock from logsynclist - * (allocation map pages inherited lsn of tblk and - * has been inserted in logsync list at txUpdateMap()) - */ - if (tblk->lsn) { - LOGSYNC_LOCK(log, flags); - log->count--; - list_del(&tblk->synclist); - LOGSYNC_UNLOCK(log, flags); - } -} - -/* - * txMaplock() - * - * function: allocate a transaction lock for freed page/entry; - * for freed page, maplock is used as xtlock/dtlock type; - */ -struct tlock *txMaplock(tid_t tid, struct inode *ip, int type) -{ - struct jfs_inode_info *jfs_ip = JFS_IP(ip); - lid_t lid; - struct tblock *tblk; - struct tlock *tlck; - struct maplock *maplock; - - TXN_LOCK(); - - /* - * allocate a tlock - */ - lid = txLockAlloc(); - tlck = lid_to_tlock(lid); - - /* - * initialize tlock - */ - tlck->tid = tid; - - /* bind the tlock and the object */ - tlck->flag = tlckINODELOCK; - if (S_ISDIR(ip->i_mode)) - tlck->flag |= tlckDIRECTORY; - tlck->ip = ip; - tlck->mp = NULL; - - tlck->type = type; - - /* - * enqueue transaction lock to transaction/inode - */ - /* insert the tlock at tail of transaction tlock list */ - if (tid) { - tblk = tid_to_tblock(tid); - if (tblk->next) - lid_to_tlock(tblk->last)->next = lid; - else - tblk->next = lid; - tlck->next = 0; - tblk->last = lid; - } - /* anonymous transaction: - * insert the tlock at head of inode anonymous tlock list - */ - else { - tlck->next = jfs_ip->atlhead; - jfs_ip->atlhead = lid; - if (tlck->next == 0) { - /* This inode's first anonymous transaction */ - jfs_ip->atltail = lid; - list_add_tail(&jfs_ip->anon_inode_list, - &TxAnchor.anon_list); - } - } - - TXN_UNLOCK(); - - /* initialize type dependent area for maplock */ - maplock = (struct maplock *) & tlck->lock; - maplock->next = 0; - maplock->maxcnt = 0; - maplock->index = 0; - - return tlck; -} - -/* - * txLinelock() - * - * function: allocate a transaction lock for log vector list - */ -struct linelock *txLinelock(struct linelock * tlock) -{ - lid_t lid; - struct tlock *tlck; - struct linelock *linelock; - - TXN_LOCK(); - - /* allocate a TxLock structure */ - lid = txLockAlloc(); - tlck = lid_to_tlock(lid); - - TXN_UNLOCK(); - - /* initialize linelock */ - linelock = (struct linelock *) tlck; - linelock->next = 0; - linelock->flag = tlckLINELOCK; - linelock->maxcnt = TLOCKLONG; - linelock->index = 0; - if (tlck->flag & tlckDIRECTORY) - linelock->flag |= tlckDIRECTORY; - - /* append linelock after tlock */ - linelock->next = tlock->next; - tlock->next = lid; - - return linelock; -} - -/* - * transaction commit management - * ----------------------------- - */ - -/* - * NAME: txCommit() - * - * FUNCTION: commit the changes to the objects specified in - * clist. For journalled segments only the - * changes of the caller are committed, ie by tid. - * for non-journalled segments the data are flushed to - * disk and then the change to the disk inode and indirect - * blocks committed (so blocks newly allocated to the - * segment will be made a part of the segment atomically). - * - * all of the segments specified in clist must be in - * one file system. no more than 6 segments are needed - * to handle all unix svcs. - * - * if the i_nlink field (i.e. disk inode link count) - * is zero, and the type of inode is a regular file or - * directory, or symbolic link , the inode is truncated - * to zero length. the truncation is committed but the - * VM resources are unaffected until it is closed (see - * iput and iclose). - * - * PARAMETER: - * - * RETURN: - * - * serialization: - * on entry the inode lock on each segment is assumed - * to be held. - * - * i/o error: - */ -int txCommit(tid_t tid, /* transaction identifier */ - int nip, /* number of inodes to commit */ - struct inode **iplist, /* list of inode to commit */ - int flag) -{ - int rc = 0; - struct commit cd; - struct jfs_log *log; - struct tblock *tblk; - struct lrd *lrd; - struct inode *ip; - struct jfs_inode_info *jfs_ip; - int k, n; - ino_t top; - struct super_block *sb; - - jfs_info("txCommit, tid = %d, flag = %d", tid, flag); - /* is read-only file system ? */ - if (isReadOnly(iplist[0])) { - rc = -EROFS; - goto TheEnd; - } - - sb = cd.sb = iplist[0]->i_sb; - cd.tid = tid; - - if (tid == 0) - tid = txBegin(sb, 0); - tblk = tid_to_tblock(tid); - - /* - * initialize commit structure - */ - log = JFS_SBI(sb)->log; - cd.log = log; - - /* initialize log record descriptor in commit */ - lrd = &cd.lrd; - lrd->logtid = cpu_to_le32(tblk->logtid); - lrd->backchain = 0; - - tblk->xflag |= flag; - - if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0) - tblk->xflag |= COMMIT_LAZY; - /* - * prepare non-journaled objects for commit - * - * flush data pages of non-journaled file - * to prevent the file getting non-initialized disk blocks - * in case of crash. - * (new blocks - ) - */ - cd.iplist = iplist; - cd.nip = nip; - - /* - * acquire transaction lock on (on-disk) inodes - * - * update on-disk inode from in-memory inode - * acquiring transaction locks for AFTER records - * on the on-disk inode of file object - * - * sort the inodes array by inode number in descending order - * to prevent deadlock when acquiring transaction lock - * of on-disk inodes on multiple on-disk inode pages by - * multiple concurrent transactions - */ - for (k = 0; k < cd.nip; k++) { - top = (cd.iplist[k])->i_ino; - for (n = k + 1; n < cd.nip; n++) { - ip = cd.iplist[n]; - if (ip->i_ino > top) { - top = ip->i_ino; - cd.iplist[n] = cd.iplist[k]; - cd.iplist[k] = ip; - } - } - - ip = cd.iplist[k]; - jfs_ip = JFS_IP(ip); - - /* - * BUGBUG - This code has temporarily been removed. The - * intent is to ensure that any file data is written before - * the metadata is committed to the journal. This prevents - * uninitialized data from appearing in a file after the - * journal has been replayed. (The uninitialized data - * could be sensitive data removed by another user.) - * - * The problem now is that we are holding the IWRITELOCK - * on the inode, and calling filemap_fdatawrite on an - * unmapped page will cause a deadlock in jfs_get_block. - * - * The long term solution is to pare down the use of - * IWRITELOCK. We are currently holding it too long. - * We could also be smarter about which data pages need - * to be written before the transaction is committed and - * when we don't need to worry about it at all. - * - * if ((!S_ISDIR(ip->i_mode)) - * && (tblk->flag & COMMIT_DELETE) == 0) - * filemap_write_and_wait(ip->i_mapping); - */ - - /* - * Mark inode as not dirty. It will still be on the dirty - * inode list, but we'll know not to commit it again unless - * it gets marked dirty again - */ - clear_cflag(COMMIT_Dirty, ip); - - /* inherit anonymous tlock(s) of inode */ - if (jfs_ip->atlhead) { - lid_to_tlock(jfs_ip->atltail)->next = tblk->next; - tblk->next = jfs_ip->atlhead; - if (!tblk->last) - tblk->last = jfs_ip->atltail; - jfs_ip->atlhead = jfs_ip->atltail = 0; - TXN_LOCK(); - list_del_init(&jfs_ip->anon_inode_list); - TXN_UNLOCK(); - } - - /* - * acquire transaction lock on on-disk inode page - * (become first tlock of the tblk's tlock list) - */ - if (((rc = diWrite(tid, ip)))) - goto out; - } - - /* - * write log records from transaction locks - * - * txUpdateMap() resets XAD_NEW in XAD. - */ - if ((rc = txLog(log, tblk, &cd))) - goto TheEnd; - - /* - * Ensure that inode isn't reused before - * lazy commit thread finishes processing - */ - if (tblk->xflag & COMMIT_DELETE) { - ihold(tblk->u.ip); - /* - * Avoid a rare deadlock - * - * If the inode is locked, we may be blocked in - * jfs_commit_inode. If so, we don't want the - * lazy_commit thread doing the last iput() on the inode - * since that may block on the locked inode. Instead, - * commit the transaction synchronously, so the last iput - * will be done by the calling thread (or later) - */ - /* - * I believe this code is no longer needed. Splitting I_LOCK - * into two bits, I_NEW and I_SYNC should prevent this - * deadlock as well. But since I don't have a JFS testload - * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done. - * Joern - */ - if (tblk->u.ip->i_state & I_SYNC) - tblk->xflag &= ~COMMIT_LAZY; - } - - ASSERT((!(tblk->xflag & COMMIT_DELETE)) || - ((tblk->u.ip->i_nlink == 0) && - !test_cflag(COMMIT_Nolink, tblk->u.ip))); - - /* - * write COMMIT log record - */ - lrd->type = cpu_to_le16(LOG_COMMIT); - lrd->length = 0; - lmLog(log, tblk, lrd, NULL); - - lmGroupCommit(log, tblk); - - /* - * - transaction is now committed - - */ - - /* - * force pages in careful update - * (imap addressing structure update) - */ - if (flag & COMMIT_FORCE) - txForce(tblk); - - /* - * update allocation map. - * - * update inode allocation map and inode: - * free pager lock on memory object of inode if any. - * update block allocation map. - * - * txUpdateMap() resets XAD_NEW in XAD. - */ - if (tblk->xflag & COMMIT_FORCE) - txUpdateMap(tblk); - - /* - * free transaction locks and pageout/free pages - */ - txRelease(tblk); - - if ((tblk->flag & tblkGC_LAZY) == 0) - txUnlock(tblk); - - - /* - * reset in-memory object state - */ - for (k = 0; k < cd.nip; k++) { - ip = cd.iplist[k]; - jfs_ip = JFS_IP(ip); - - /* - * reset in-memory inode state - */ - jfs_ip->bxflag = 0; - jfs_ip->blid = 0; - } - - out: - if (rc != 0) - txAbort(tid, 1); - - TheEnd: - jfs_info("txCommit: tid = %d, returning %d", tid, rc); - return rc; -} - -/* - * NAME: txLog() - * - * FUNCTION: Writes AFTER log records for all lines modified - * by tid for segments specified by inodes in comdata. - * Code assumes only WRITELOCKS are recorded in lockwords. - * - * PARAMETERS: - * - * RETURN : - */ -static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd) -{ - int rc = 0; - struct inode *ip; - lid_t lid; - struct tlock *tlck; - struct lrd *lrd = &cd->lrd; - - /* - * write log record(s) for each tlock of transaction, - */ - for (lid = tblk->next; lid; lid = tlck->next) { - tlck = lid_to_tlock(lid); - - tlck->flag |= tlckLOG; - - /* initialize lrd common */ - ip = tlck->ip; - lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate); - lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset); - lrd->log.redopage.inode = cpu_to_le32(ip->i_ino); - - /* write log record of page from the tlock */ - switch (tlck->type & tlckTYPE) { - case tlckXTREE: - xtLog(log, tblk, lrd, tlck); - break; - - case tlckDTREE: - dtLog(log, tblk, lrd, tlck); - break; - - case tlckINODE: - diLog(log, tblk, lrd, tlck, cd); - break; - - case tlckMAP: - mapLog(log, tblk, lrd, tlck); - break; - - case tlckDATA: - dataLog(log, tblk, lrd, tlck); - break; - - default: - jfs_err("UFO tlock:0x%p", tlck); - } - } - - return rc; -} - -/* - * diLog() - * - * function: log inode tlock and format maplock to update bmap; - */ -static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck, struct commit * cd) -{ - int rc = 0; - struct metapage *mp; - pxd_t *pxd; - struct pxd_lock *pxdlock; - - mp = tlck->mp; - - /* initialize as REDOPAGE record format */ - lrd->log.redopage.type = cpu_to_le16(LOG_INODE); - lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE); - - pxd = &lrd->log.redopage.pxd; - - /* - * inode after image - */ - if (tlck->type & tlckENTRY) { - /* log after-image for logredo(): */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - PXDaddress(pxd, mp->index); - PXDlength(pxd, - mp->logical_size >> tblk->sb->s_blocksize_bits); - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - } else if (tlck->type & tlckFREE) { - /* - * free inode extent - * - * (pages of the freed inode extent have been invalidated and - * a maplock for free of the extent has been formatted at - * txLock() time); - * - * the tlock had been acquired on the inode allocation map page - * (iag) that specifies the freed extent, even though the map - * page is not itself logged, to prevent pageout of the map - * page before the log; - */ - - /* log LOG_NOREDOINOEXT of the freed inode extent for - * logredo() to start NoRedoPage filters, and to update - * imap and bmap for free of the extent; - */ - lrd->type = cpu_to_le16(LOG_NOREDOINOEXT); - /* - * For the LOG_NOREDOINOEXT record, we need - * to pass the IAG number and inode extent - * index (within that IAG) from which the - * the extent being released. These have been - * passed to us in the iplist[1] and iplist[2]. - */ - lrd->log.noredoinoext.iagnum = - cpu_to_le32((u32) (size_t) cd->iplist[1]); - lrd->log.noredoinoext.inoext_idx = - cpu_to_le32((u32) (size_t) cd->iplist[2]); - - pxdlock = (struct pxd_lock *) & tlck->lock; - *pxd = pxdlock->pxd; - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - - /* update bmap */ - tlck->flag |= tlckUPDATEMAP; - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - } else - jfs_err("diLog: UFO type tlck:0x%p", tlck); -#ifdef _JFS_WIP - /* - * alloc/free external EA extent - * - * a maplock for txUpdateMap() to update bPWMAP for alloc/free - * of the extent has been formatted at txLock() time; - */ - else { - assert(tlck->type & tlckEA); - - /* log LOG_UPDATEMAP for logredo() to update bmap for - * alloc of new (and free of old) external EA extent; - */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - pxdlock = (struct pxd_lock *) & tlck->lock; - nlock = pxdlock->index; - for (i = 0; i < nlock; i++, pxdlock++) { - if (pxdlock->flag & mlckALLOCPXD) - lrd->log.updatemap.type = - cpu_to_le16(LOG_ALLOCPXD); - else - lrd->log.updatemap.type = - cpu_to_le16(LOG_FREEPXD); - lrd->log.updatemap.nxd = cpu_to_le16(1); - lrd->log.updatemap.pxd = pxdlock->pxd; - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - } - - /* update bmap */ - tlck->flag |= tlckUPDATEMAP; - } -#endif /* _JFS_WIP */ - - return rc; -} - -/* - * dataLog() - * - * function: log data tlock - */ -static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck) -{ - struct metapage *mp; - pxd_t *pxd; - - mp = tlck->mp; - - /* initialize as REDOPAGE record format */ - lrd->log.redopage.type = cpu_to_le16(LOG_DATA); - lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE); - - pxd = &lrd->log.redopage.pxd; - - /* log after-image for logredo(): */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - - if (jfs_dirtable_inline(tlck->ip)) { - /* - * The table has been truncated, we've must have deleted - * the last entry, so don't bother logging this - */ - mp->lid = 0; - grab_metapage(mp); - metapage_homeok(mp); - discard_metapage(mp); - tlck->mp = NULL; - return 0; - } - - PXDaddress(pxd, mp->index); - PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits); - - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - - return 0; -} - -/* - * dtLog() - * - * function: log dtree tlock and format maplock to update bmap; - */ -static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck) -{ - struct metapage *mp; - struct pxd_lock *pxdlock; - pxd_t *pxd; - - mp = tlck->mp; - - /* initialize as REDOPAGE/NOREDOPAGE record format */ - lrd->log.redopage.type = cpu_to_le16(LOG_DTREE); - lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE); - - pxd = &lrd->log.redopage.pxd; - - if (tlck->type & tlckBTROOT) - lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT); - - /* - * page extension via relocation: entry insertion; - * page extension in-place: entry insertion; - * new right page from page split, reinitialized in-line - * root from root page split: entry insertion; - */ - if (tlck->type & (tlckNEW | tlckEXTEND)) { - /* log after-image of the new page for logredo(): - * mark log (LOG_NEW) for logredo() to initialize - * freelist and update bmap for alloc of the new page; - */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - if (tlck->type & tlckEXTEND) - lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND); - else - lrd->log.redopage.type |= cpu_to_le16(LOG_NEW); - PXDaddress(pxd, mp->index); - PXDlength(pxd, - mp->logical_size >> tblk->sb->s_blocksize_bits); - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* format a maplock for txUpdateMap() to update bPMAP for - * alloc of the new page; - */ - if (tlck->type & tlckBTROOT) - return; - tlck->flag |= tlckUPDATEMAP; - pxdlock = (struct pxd_lock *) & tlck->lock; - pxdlock->flag = mlckALLOCPXD; - pxdlock->pxd = *pxd; - - pxdlock->index = 1; - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - return; - } - - /* - * entry insertion/deletion, - * sibling page link update (old right page before split); - */ - if (tlck->type & (tlckENTRY | tlckRELINK)) { - /* log after-image for logredo(): */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - PXDaddress(pxd, mp->index); - PXDlength(pxd, - mp->logical_size >> tblk->sb->s_blocksize_bits); - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - return; - } - - /* - * page deletion: page has been invalidated - * page relocation: source extent - * - * a maplock for free of the page has been formatted - * at txLock() time); - */ - if (tlck->type & (tlckFREE | tlckRELOCATE)) { - /* log LOG_NOREDOPAGE of the deleted page for logredo() - * to start NoRedoPage filter and to update bmap for free - * of the deletd page - */ - lrd->type = cpu_to_le16(LOG_NOREDOPAGE); - pxdlock = (struct pxd_lock *) & tlck->lock; - *pxd = pxdlock->pxd; - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - - /* a maplock for txUpdateMap() for free of the page - * has been formatted at txLock() time; - */ - tlck->flag |= tlckUPDATEMAP; - } - return; -} - -/* - * xtLog() - * - * function: log xtree tlock and format maplock to update bmap; - */ -static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck) -{ - struct inode *ip; - struct metapage *mp; - xtpage_t *p; - struct xtlock *xtlck; - struct maplock *maplock; - struct xdlistlock *xadlock; - struct pxd_lock *pxdlock; - pxd_t *page_pxd; - int next, lwm, hwm; - - ip = tlck->ip; - mp = tlck->mp; - - /* initialize as REDOPAGE/NOREDOPAGE record format */ - lrd->log.redopage.type = cpu_to_le16(LOG_XTREE); - lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE); - - page_pxd = &lrd->log.redopage.pxd; - - if (tlck->type & tlckBTROOT) { - lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT); - p = &JFS_IP(ip)->i_xtroot; - if (S_ISDIR(ip->i_mode)) - lrd->log.redopage.type |= - cpu_to_le16(LOG_DIR_XTREE); - } else - p = (xtpage_t *) mp->data; - next = le16_to_cpu(p->header.nextindex); - - xtlck = (struct xtlock *) & tlck->lock; - - maplock = (struct maplock *) & tlck->lock; - xadlock = (struct xdlistlock *) maplock; - - /* - * entry insertion/extension; - * sibling page link update (old right page before split); - */ - if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) { - /* log after-image for logredo(): - * logredo() will update bmap for alloc of new/extended - * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from - * after-image of XADlist; - * logredo() resets (XAD_NEW|XAD_EXTEND) flag when - * applying the after-image to the meta-data page. - */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - PXDaddress(page_pxd, mp->index); - PXDlength(page_pxd, - mp->logical_size >> tblk->sb->s_blocksize_bits); - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* format a maplock for txUpdateMap() to update bPMAP - * for alloc of new/extended extents of XAD[lwm:next) - * from the page itself; - * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag. - */ - lwm = xtlck->lwm.offset; - if (lwm == 0) - lwm = XTPAGEMAXSLOT; - - if (lwm == next) - goto out; - if (lwm > next) { - jfs_err("xtLog: lwm > next\n"); - goto out; - } - tlck->flag |= tlckUPDATEMAP; - xadlock->flag = mlckALLOCXADLIST; - xadlock->count = next - lwm; - if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) { - int i; - pxd_t *pxd; - /* - * Lazy commit may allow xtree to be modified before - * txUpdateMap runs. Copy xad into linelock to - * preserve correct data. - * - * We can fit twice as may pxd's as xads in the lock - */ - xadlock->flag = mlckALLOCPXDLIST; - pxd = xadlock->xdlist = &xtlck->pxdlock; - for (i = 0; i < xadlock->count; i++) { - PXDaddress(pxd, addressXAD(&p->xad[lwm + i])); - PXDlength(pxd, lengthXAD(&p->xad[lwm + i])); - p->xad[lwm + i].flag &= - ~(XAD_NEW | XAD_EXTENDED); - pxd++; - } - } else { - /* - * xdlist will point to into inode's xtree, ensure - * that transaction is not committed lazily. - */ - xadlock->flag = mlckALLOCXADLIST; - xadlock->xdlist = &p->xad[lwm]; - tblk->xflag &= ~COMMIT_LAZY; - } - jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d " - "count:%d", tlck->ip, mp, tlck, lwm, xadlock->count); - - maplock->index = 1; - - out: - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - - return; - } - - /* - * page deletion: file deletion/truncation (ref. xtTruncate()) - * - * (page will be invalidated after log is written and bmap - * is updated from the page); - */ - if (tlck->type & tlckFREE) { - /* LOG_NOREDOPAGE log for NoRedoPage filter: - * if page free from file delete, NoRedoFile filter from - * inode image of zero link count will subsume NoRedoPage - * filters for each page; - * if page free from file truncattion, write NoRedoPage - * filter; - * - * upadte of block allocation map for the page itself: - * if page free from deletion and truncation, LOG_UPDATEMAP - * log for the page itself is generated from processing - * its parent page xad entries; - */ - /* if page free from file truncation, log LOG_NOREDOPAGE - * of the deleted page for logredo() to start NoRedoPage - * filter for the page; - */ - if (tblk->xflag & COMMIT_TRUNCATE) { - /* write NOREDOPAGE for the page */ - lrd->type = cpu_to_le16(LOG_NOREDOPAGE); - PXDaddress(page_pxd, mp->index); - PXDlength(page_pxd, - mp->logical_size >> tblk->sb-> - s_blocksize_bits); - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - - if (tlck->type & tlckBTROOT) { - /* Empty xtree must be logged */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - } - } - - /* init LOG_UPDATEMAP of the freed extents - * XAD[XTENTRYSTART:hwm) from the deleted page itself - * for logredo() to update bmap; - */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - lrd->log.updatemap.type = cpu_to_le16(LOG_FREEXADLIST); - xtlck = (struct xtlock *) & tlck->lock; - hwm = xtlck->hwm.offset; - lrd->log.updatemap.nxd = - cpu_to_le16(hwm - XTENTRYSTART + 1); - /* reformat linelock for lmLog() */ - xtlck->header.offset = XTENTRYSTART; - xtlck->header.length = hwm - XTENTRYSTART + 1; - xtlck->index = 1; - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* format a maplock for txUpdateMap() to update bmap - * to free extents of XAD[XTENTRYSTART:hwm) from the - * deleted page itself; - */ - tlck->flag |= tlckUPDATEMAP; - xadlock->count = hwm - XTENTRYSTART + 1; - if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) { - int i; - pxd_t *pxd; - /* - * Lazy commit may allow xtree to be modified before - * txUpdateMap runs. Copy xad into linelock to - * preserve correct data. - * - * We can fit twice as may pxd's as xads in the lock - */ - xadlock->flag = mlckFREEPXDLIST; - pxd = xadlock->xdlist = &xtlck->pxdlock; - for (i = 0; i < xadlock->count; i++) { - PXDaddress(pxd, - addressXAD(&p->xad[XTENTRYSTART + i])); - PXDlength(pxd, - lengthXAD(&p->xad[XTENTRYSTART + i])); - pxd++; - } - } else { - /* - * xdlist will point to into inode's xtree, ensure - * that transaction is not committed lazily. - */ - xadlock->flag = mlckFREEXADLIST; - xadlock->xdlist = &p->xad[XTENTRYSTART]; - tblk->xflag &= ~COMMIT_LAZY; - } - jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2", - tlck->ip, mp, xadlock->count); - - maplock->index = 1; - - /* mark page as invalid */ - if (((tblk->xflag & COMMIT_PWMAP) || S_ISDIR(ip->i_mode)) - && !(tlck->type & tlckBTROOT)) - tlck->flag |= tlckFREEPAGE; - /* - else (tblk->xflag & COMMIT_PMAP) - ? release the page; - */ - return; - } - - /* - * page/entry truncation: file truncation (ref. xtTruncate()) - * - * |----------+------+------+---------------| - * | | | - * | | hwm - hwm before truncation - * | next - truncation point - * lwm - lwm before truncation - * header ? - */ - if (tlck->type & tlckTRUNCATE) { - /* This odd declaration suppresses a bogus gcc warning */ - pxd_t pxd = pxd; /* truncated extent of xad */ - int twm; - - /* - * For truncation the entire linelock may be used, so it would - * be difficult to store xad list in linelock itself. - * Therefore, we'll just force transaction to be committed - * synchronously, so that xtree pages won't be changed before - * txUpdateMap runs. - */ - tblk->xflag &= ~COMMIT_LAZY; - lwm = xtlck->lwm.offset; - if (lwm == 0) - lwm = XTPAGEMAXSLOT; - hwm = xtlck->hwm.offset; - twm = xtlck->twm.offset; - - /* - * write log records - */ - /* log after-image for logredo(): - * - * logredo() will update bmap for alloc of new/extended - * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from - * after-image of XADlist; - * logredo() resets (XAD_NEW|XAD_EXTEND) flag when - * applying the after-image to the meta-data page. - */ - lrd->type = cpu_to_le16(LOG_REDOPAGE); - PXDaddress(page_pxd, mp->index); - PXDlength(page_pxd, - mp->logical_size >> tblk->sb->s_blocksize_bits); - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - - /* - * truncate entry XAD[twm == next - 1]: - */ - if (twm == next - 1) { - /* init LOG_UPDATEMAP for logredo() to update bmap for - * free of truncated delta extent of the truncated - * entry XAD[next - 1]: - * (xtlck->pxdlock = truncated delta extent); - */ - pxdlock = (struct pxd_lock *) & xtlck->pxdlock; - /* assert(pxdlock->type & tlckTRUNCATE); */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD); - lrd->log.updatemap.nxd = cpu_to_le16(1); - lrd->log.updatemap.pxd = pxdlock->pxd; - pxd = pxdlock->pxd; /* save to format maplock */ - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - } - - /* - * free entries XAD[next:hwm]: - */ - if (hwm >= next) { - /* init LOG_UPDATEMAP of the freed extents - * XAD[next:hwm] from the deleted page itself - * for logredo() to update bmap; - */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - lrd->log.updatemap.type = - cpu_to_le16(LOG_FREEXADLIST); - xtlck = (struct xtlock *) & tlck->lock; - hwm = xtlck->hwm.offset; - lrd->log.updatemap.nxd = - cpu_to_le16(hwm - next + 1); - /* reformat linelock for lmLog() */ - xtlck->header.offset = next; - xtlck->header.length = hwm - next + 1; - xtlck->index = 1; - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, tlck)); - } - - /* - * format maplock(s) for txUpdateMap() to update bmap - */ - maplock->index = 0; - - /* - * allocate entries XAD[lwm:next): - */ - if (lwm < next) { - /* format a maplock for txUpdateMap() to update bPMAP - * for alloc of new/extended extents of XAD[lwm:next) - * from the page itself; - * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag. - */ - tlck->flag |= tlckUPDATEMAP; - xadlock->flag = mlckALLOCXADLIST; - xadlock->count = next - lwm; - xadlock->xdlist = &p->xad[lwm]; - - jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d " - "lwm:%d next:%d", - tlck->ip, mp, xadlock->count, lwm, next); - maplock->index++; - xadlock++; - } - - /* - * truncate entry XAD[twm == next - 1]: - */ - if (twm == next - 1) { - /* format a maplock for txUpdateMap() to update bmap - * to free truncated delta extent of the truncated - * entry XAD[next - 1]; - * (xtlck->pxdlock = truncated delta extent); - */ - tlck->flag |= tlckUPDATEMAP; - pxdlock = (struct pxd_lock *) xadlock; - pxdlock->flag = mlckFREEPXD; - pxdlock->count = 1; - pxdlock->pxd = pxd; - - jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d " - "hwm:%d", ip, mp, pxdlock->count, hwm); - maplock->index++; - xadlock++; - } - - /* - * free entries XAD[next:hwm]: - */ - if (hwm >= next) { - /* format a maplock for txUpdateMap() to update bmap - * to free extents of XAD[next:hwm] from thedeleted - * page itself; - */ - tlck->flag |= tlckUPDATEMAP; - xadlock->flag = mlckFREEXADLIST; - xadlock->count = hwm - next + 1; - xadlock->xdlist = &p->xad[next]; - - jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d " - "next:%d hwm:%d", - tlck->ip, mp, xadlock->count, next, hwm); - maplock->index++; - } - - /* mark page as homeward bound */ - tlck->flag |= tlckWRITEPAGE; - } - return; -} - -/* - * mapLog() - * - * function: log from maplock of freed data extents; - */ -static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, - struct tlock * tlck) -{ - struct pxd_lock *pxdlock; - int i, nlock; - pxd_t *pxd; - - /* - * page relocation: free the source page extent - * - * a maplock for txUpdateMap() for free of the page - * has been formatted at txLock() time saving the src - * relocated page address; - */ - if (tlck->type & tlckRELOCATE) { - /* log LOG_NOREDOPAGE of the old relocated page - * for logredo() to start NoRedoPage filter; - */ - lrd->type = cpu_to_le16(LOG_NOREDOPAGE); - pxdlock = (struct pxd_lock *) & tlck->lock; - pxd = &lrd->log.redopage.pxd; - *pxd = pxdlock->pxd; - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - - /* (N.B. currently, logredo() does NOT update bmap - * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE); - * if page free from relocation, LOG_UPDATEMAP log is - * specifically generated now for logredo() - * to update bmap for free of src relocated page; - * (new flag LOG_RELOCATE may be introduced which will - * inform logredo() to start NORedoPage filter and also - * update block allocation map at the same time, thus - * avoiding an extra log write); - */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD); - lrd->log.updatemap.nxd = cpu_to_le16(1); - lrd->log.updatemap.pxd = pxdlock->pxd; - lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - - /* a maplock for txUpdateMap() for free of the page - * has been formatted at txLock() time; - */ - tlck->flag |= tlckUPDATEMAP; - return; - } - /* - - * Otherwise it's not a relocate request - * - */ - else { - /* log LOG_UPDATEMAP for logredo() to update bmap for - * free of truncated/relocated delta extent of the data; - * e.g.: external EA extent, relocated/truncated extent - * from xtTailgate(); - */ - lrd->type = cpu_to_le16(LOG_UPDATEMAP); - pxdlock = (struct pxd_lock *) & tlck->lock; - nlock = pxdlock->index; - for (i = 0; i < nlock; i++, pxdlock++) { - if (pxdlock->flag & mlckALLOCPXD) - lrd->log.updatemap.type = - cpu_to_le16(LOG_ALLOCPXD); - else - lrd->log.updatemap.type = - cpu_to_le16(LOG_FREEPXD); - lrd->log.updatemap.nxd = cpu_to_le16(1); - lrd->log.updatemap.pxd = pxdlock->pxd; - lrd->backchain = - cpu_to_le32(lmLog(log, tblk, lrd, NULL)); - jfs_info("mapLog: xaddr:0x%lx xlen:0x%x", - (ulong) addressPXD(&pxdlock->pxd), - lengthPXD(&pxdlock->pxd)); - } - - /* update bmap */ - tlck->flag |= tlckUPDATEMAP; - } -} - -/* - * txEA() - * - * function: acquire maplock for EA/ACL extents or - * set COMMIT_INLINE flag; - */ -void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea) -{ - struct tlock *tlck = NULL; - struct pxd_lock *maplock = NULL, *pxdlock = NULL; - - /* - * format maplock for alloc of new EA extent - */ - if (newea) { - /* Since the newea could be a completely zeroed entry we need to - * check for the two flags which indicate we should actually - * commit new EA data - */ - if (newea->flag & DXD_EXTENT) { - tlck = txMaplock(tid, ip, tlckMAP); - maplock = (struct pxd_lock *) & tlck->lock; - pxdlock = (struct pxd_lock *) maplock; - pxdlock->flag = mlckALLOCPXD; - PXDaddress(&pxdlock->pxd, addressDXD(newea)); - PXDlength(&pxdlock->pxd, lengthDXD(newea)); - pxdlock++; - maplock->index = 1; - } else if (newea->flag & DXD_INLINE) { - tlck = NULL; - - set_cflag(COMMIT_Inlineea, ip); - } - } - - /* - * format maplock for free of old EA extent - */ - if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) { - if (tlck == NULL) { - tlck = txMaplock(tid, ip, tlckMAP); - maplock = (struct pxd_lock *) & tlck->lock; - pxdlock = (struct pxd_lock *) maplock; - maplock->index = 0; - } - pxdlock->flag = mlckFREEPXD; - PXDaddress(&pxdlock->pxd, addressDXD(oldea)); - PXDlength(&pxdlock->pxd, lengthDXD(oldea)); - maplock->index++; - } -} - -/* - * txForce() - * - * function: synchronously write pages locked by transaction - * after txLog() but before txUpdateMap(); - */ -static void txForce(struct tblock * tblk) -{ - struct tlock *tlck; - lid_t lid, next; - struct metapage *mp; - - /* - * reverse the order of transaction tlocks in - * careful update order of address index pages - * (right to left, bottom up) - */ - tlck = lid_to_tlock(tblk->next); - lid = tlck->next; - tlck->next = 0; - while (lid) { - tlck = lid_to_tlock(lid); - next = tlck->next; - tlck->next = tblk->next; - tblk->next = lid; - lid = next; - } - - /* - * synchronously write the page, and - * hold the page for txUpdateMap(); - */ - for (lid = tblk->next; lid; lid = next) { - tlck = lid_to_tlock(lid); - next = tlck->next; - - if ((mp = tlck->mp) != NULL && - (tlck->type & tlckBTROOT) == 0) { - assert(mp->xflag & COMMIT_PAGE); - - if (tlck->flag & tlckWRITEPAGE) { - tlck->flag &= ~tlckWRITEPAGE; - - /* do not release page to freelist */ - force_metapage(mp); -#if 0 - /* - * The "right" thing to do here is to - * synchronously write the metadata. - * With the current implementation this - * is hard since write_metapage requires - * us to kunmap & remap the page. If we - * have tlocks pointing into the metadata - * pages, we don't want to do this. I think - * we can get by with synchronously writing - * the pages when they are released. - */ - assert(mp->nohomeok); - set_bit(META_dirty, &mp->flag); - set_bit(META_sync, &mp->flag); -#endif - } - } - } -} - -/* - * txUpdateMap() - * - * function: update persistent allocation map (and working map - * if appropriate); - * - * parameter: - */ -static void txUpdateMap(struct tblock * tblk) -{ - struct inode *ip; - struct inode *ipimap; - lid_t lid; - struct tlock *tlck; - struct maplock *maplock; - struct pxd_lock pxdlock; - int maptype; - int k, nlock; - struct metapage *mp = NULL; - - ipimap = JFS_SBI(tblk->sb)->ipimap; - - maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP; - - - /* - * update block allocation map - * - * update allocation state in pmap (and wmap) and - * update lsn of the pmap page; - */ - /* - * scan each tlock/page of transaction for block allocation/free: - * - * for each tlock/page of transaction, update map. - * ? are there tlock for pmap and pwmap at the same time ? - */ - for (lid = tblk->next; lid; lid = tlck->next) { - tlck = lid_to_tlock(lid); - - if ((tlck->flag & tlckUPDATEMAP) == 0) - continue; - - if (tlck->flag & tlckFREEPAGE) { - /* - * Another thread may attempt to reuse freed space - * immediately, so we want to get rid of the metapage - * before anyone else has a chance to get it. - * Lock metapage, update maps, then invalidate - * the metapage. - */ - mp = tlck->mp; - ASSERT(mp->xflag & COMMIT_PAGE); - grab_metapage(mp); - } - - /* - * extent list: - * . in-line PXD list: - * . out-of-line XAD list: - */ - maplock = (struct maplock *) & tlck->lock; - nlock = maplock->index; - - for (k = 0; k < nlock; k++, maplock++) { - /* - * allocate blocks in persistent map: - * - * blocks have been allocated from wmap at alloc time; - */ - if (maplock->flag & mlckALLOC) { - txAllocPMap(ipimap, maplock, tblk); - } - /* - * free blocks in persistent and working map: - * blocks will be freed in pmap and then in wmap; - * - * ? tblock specifies the PMAP/PWMAP based upon - * transaction - * - * free blocks in persistent map: - * blocks will be freed from wmap at last reference - * release of the object for regular files; - * - * Alway free blocks from both persistent & working - * maps for directories - */ - else { /* (maplock->flag & mlckFREE) */ - - if (tlck->flag & tlckDIRECTORY) - txFreeMap(ipimap, maplock, - tblk, COMMIT_PWMAP); - else - txFreeMap(ipimap, maplock, - tblk, maptype); - } - } - if (tlck->flag & tlckFREEPAGE) { - if (!(tblk->flag & tblkGC_LAZY)) { - /* This is equivalent to txRelease */ - ASSERT(mp->lid == lid); - tlck->mp->lid = 0; - } - assert(mp->nohomeok == 1); - metapage_homeok(mp); - discard_metapage(mp); - tlck->mp = NULL; - } - } - /* - * update inode allocation map - * - * update allocation state in pmap and - * update lsn of the pmap page; - * update in-memory inode flag/state - * - * unlock mapper/write lock - */ - if (tblk->xflag & COMMIT_CREATE) { - diUpdatePMap(ipimap, tblk->ino, false, tblk); - /* update persistent block allocation map - * for the allocation of inode extent; - */ - pxdlock.flag = mlckALLOCPXD; - pxdlock.pxd = tblk->u.ixpxd; - pxdlock.index = 1; - txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk); - } else if (tblk->xflag & COMMIT_DELETE) { - ip = tblk->u.ip; - diUpdatePMap(ipimap, ip->i_ino, true, tblk); - iput(ip); - } -} - -/* - * txAllocPMap() - * - * function: allocate from persistent map; - * - * parameter: - * ipbmap - - * malock - - * xad list: - * pxd: - * - * maptype - - * allocate from persistent map; - * free from persistent map; - * (e.g., tmp file - free from working map at releae - * of last reference); - * free from persistent and working map; - * - * lsn - log sequence number; - */ -static void txAllocPMap(struct inode *ip, struct maplock * maplock, - struct tblock * tblk) -{ - struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; - struct xdlistlock *xadlistlock; - xad_t *xad; - s64 xaddr; - int xlen; - struct pxd_lock *pxdlock; - struct xdlistlock *pxdlistlock; - pxd_t *pxd; - int n; - - /* - * allocate from persistent map; - */ - if (maplock->flag & mlckALLOCXADLIST) { - xadlistlock = (struct xdlistlock *) maplock; - xad = xadlistlock->xdlist; - for (n = 0; n < xadlistlock->count; n++, xad++) { - if (xad->flag & (XAD_NEW | XAD_EXTENDED)) { - xaddr = addressXAD(xad); - xlen = lengthXAD(xad); - dbUpdatePMap(ipbmap, false, xaddr, - (s64) xlen, tblk); - xad->flag &= ~(XAD_NEW | XAD_EXTENDED); - jfs_info("allocPMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } - } - } else if (maplock->flag & mlckALLOCPXD) { - pxdlock = (struct pxd_lock *) maplock; - xaddr = addressPXD(&pxdlock->pxd); - xlen = lengthPXD(&pxdlock->pxd); - dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk); - jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen); - } else { /* (maplock->flag & mlckALLOCPXDLIST) */ - - pxdlistlock = (struct xdlistlock *) maplock; - pxd = pxdlistlock->xdlist; - for (n = 0; n < pxdlistlock->count; n++, pxd++) { - xaddr = addressPXD(pxd); - xlen = lengthPXD(pxd); - dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, - tblk); - jfs_info("allocPMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } - } -} - -/* - * txFreeMap() - * - * function: free from persistent and/or working map; - * - * todo: optimization - */ -void txFreeMap(struct inode *ip, - struct maplock * maplock, struct tblock * tblk, int maptype) -{ - struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; - struct xdlistlock *xadlistlock; - xad_t *xad; - s64 xaddr; - int xlen; - struct pxd_lock *pxdlock; - struct xdlistlock *pxdlistlock; - pxd_t *pxd; - int n; - - jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x", - tblk, maplock, maptype); - - /* - * free from persistent map; - */ - if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) { - if (maplock->flag & mlckFREEXADLIST) { - xadlistlock = (struct xdlistlock *) maplock; - xad = xadlistlock->xdlist; - for (n = 0; n < xadlistlock->count; n++, xad++) { - if (!(xad->flag & XAD_NEW)) { - xaddr = addressXAD(xad); - xlen = lengthXAD(xad); - dbUpdatePMap(ipbmap, true, xaddr, - (s64) xlen, tblk); - jfs_info("freePMap: xaddr:0x%lx " - "xlen:%d", - (ulong) xaddr, xlen); - } - } - } else if (maplock->flag & mlckFREEPXD) { - pxdlock = (struct pxd_lock *) maplock; - xaddr = addressPXD(&pxdlock->pxd); - xlen = lengthPXD(&pxdlock->pxd); - dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen, - tblk); - jfs_info("freePMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } else { /* (maplock->flag & mlckALLOCPXDLIST) */ - - pxdlistlock = (struct xdlistlock *) maplock; - pxd = pxdlistlock->xdlist; - for (n = 0; n < pxdlistlock->count; n++, pxd++) { - xaddr = addressPXD(pxd); - xlen = lengthPXD(pxd); - dbUpdatePMap(ipbmap, true, xaddr, - (s64) xlen, tblk); - jfs_info("freePMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } - } - } - - /* - * free from working map; - */ - if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) { - if (maplock->flag & mlckFREEXADLIST) { - xadlistlock = (struct xdlistlock *) maplock; - xad = xadlistlock->xdlist; - for (n = 0; n < xadlistlock->count; n++, xad++) { - xaddr = addressXAD(xad); - xlen = lengthXAD(xad); - dbFree(ip, xaddr, (s64) xlen); - xad->flag = 0; - jfs_info("freeWMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } - } else if (maplock->flag & mlckFREEPXD) { - pxdlock = (struct pxd_lock *) maplock; - xaddr = addressPXD(&pxdlock->pxd); - xlen = lengthPXD(&pxdlock->pxd); - dbFree(ip, xaddr, (s64) xlen); - jfs_info("freeWMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } else { /* (maplock->flag & mlckFREEPXDLIST) */ - - pxdlistlock = (struct xdlistlock *) maplock; - pxd = pxdlistlock->xdlist; - for (n = 0; n < pxdlistlock->count; n++, pxd++) { - xaddr = addressPXD(pxd); - xlen = lengthPXD(pxd); - dbFree(ip, xaddr, (s64) xlen); - jfs_info("freeWMap: xaddr:0x%lx xlen:%d", - (ulong) xaddr, xlen); - } - } - } -} - -/* - * txFreelock() - * - * function: remove tlock from inode anonymous locklist - */ -void txFreelock(struct inode *ip) -{ - struct jfs_inode_info *jfs_ip = JFS_IP(ip); - struct tlock *xtlck, *tlck; - lid_t xlid = 0, lid; - - if (!jfs_ip->atlhead) - return; - - TXN_LOCK(); - xtlck = (struct tlock *) &jfs_ip->atlhead; - - while ((lid = xtlck->next) != 0) { - tlck = lid_to_tlock(lid); - if (tlck->flag & tlckFREELOCK) { - xtlck->next = tlck->next; - txLockFree(lid); - } else { - xtlck = tlck; - xlid = lid; - } - } - - if (jfs_ip->atlhead) - jfs_ip->atltail = xlid; - else { - jfs_ip->atltail = 0; - /* - * If inode was on anon_list, remove it - */ - list_del_init(&jfs_ip->anon_inode_list); - } - TXN_UNLOCK(); -} - -/* - * txAbort() - * - * function: abort tx before commit; - * - * frees line-locks and segment locks for all - * segments in comdata structure. - * Optionally sets state of file-system to FM_DIRTY in super-block. - * log age of page-frames in memory for which caller has - * are reset to 0 (to avoid logwarap). - */ -void txAbort(tid_t tid, int dirty) -{ - lid_t lid, next; - struct metapage *mp; - struct tblock *tblk = tid_to_tblock(tid); - struct tlock *tlck; - - /* - * free tlocks of the transaction - */ - for (lid = tblk->next; lid; lid = next) { - tlck = lid_to_tlock(lid); - next = tlck->next; - mp = tlck->mp; - JFS_IP(tlck->ip)->xtlid = 0; - - if (mp) { - mp->lid = 0; - - /* - * reset lsn of page to avoid logwarap: - * - * (page may have been previously committed by another - * transaction(s) but has not been paged, i.e., - * it may be on logsync list even though it has not - * been logged for the current tx.) - */ - if (mp->xflag & COMMIT_PAGE && mp->lsn) - LogSyncRelease(mp); - } - /* insert tlock at head of freelist */ - TXN_LOCK(); - txLockFree(lid); - TXN_UNLOCK(); - } - - /* caller will free the transaction block */ - - tblk->next = tblk->last = 0; - - /* - * mark filesystem dirty - */ - if (dirty) - jfs_error(tblk->sb, "txAbort"); - - return; -} - -/* - * txLazyCommit(void) - * - * All transactions except those changing ipimap (COMMIT_FORCE) are - * processed by this routine. This insures that the inode and block - * allocation maps are updated in order. For synchronous transactions, - * let the user thread finish processing after txUpdateMap() is called. - */ -static void txLazyCommit(struct tblock * tblk) -{ - struct jfs_log *log; - - while (((tblk->flag & tblkGC_READY) == 0) && - ((tblk->flag & tblkGC_UNLOCKED) == 0)) { - /* We must have gotten ahead of the user thread - */ - jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk); - yield(); - } - - jfs_info("txLazyCommit: processing tblk 0x%p", tblk); - - txUpdateMap(tblk); - - log = (struct jfs_log *) JFS_SBI(tblk->sb)->log; - - spin_lock_irq(&log->gclock); // LOGGC_LOCK - - tblk->flag |= tblkGC_COMMITTED; - - if (tblk->flag & tblkGC_READY) - log->gcrtc--; - - wake_up_all(&tblk->gcwait); // LOGGC_WAKEUP - - /* - * Can't release log->gclock until we've tested tblk->flag - */ - if (tblk->flag & tblkGC_LAZY) { - spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK - txUnlock(tblk); - tblk->flag &= ~tblkGC_LAZY; - txEnd(tblk - TxBlock); /* Convert back to tid */ - } else - spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK - - jfs_info("txLazyCommit: done: tblk = 0x%p", tblk); -} - -/* - * jfs_lazycommit(void) - * - * To be run as a kernel daemon. If lbmIODone is called in an interrupt - * context, or where blocking is not wanted, this routine will process - * committed transactions from the unlock queue. - */ -int jfs_lazycommit(void *arg) -{ - int WorkDone; - struct tblock *tblk; - unsigned long flags; - struct jfs_sb_info *sbi; - - do { - LAZY_LOCK(flags); - jfs_commit_thread_waking = 0; /* OK to wake another thread */ - while (!list_empty(&TxAnchor.unlock_queue)) { - WorkDone = 0; - list_for_each_entry(tblk, &TxAnchor.unlock_queue, - cqueue) { - - sbi = JFS_SBI(tblk->sb); - /* - * For each volume, the transactions must be - * handled in order. If another commit thread - * is handling a tblk for this superblock, - * skip it - */ - if (sbi->commit_state & IN_LAZYCOMMIT) - continue; - - sbi->commit_state |= IN_LAZYCOMMIT; - WorkDone = 1; - - /* - * Remove transaction from queue - */ - list_del(&tblk->cqueue); - - LAZY_UNLOCK(flags); - txLazyCommit(tblk); - LAZY_LOCK(flags); - - sbi->commit_state &= ~IN_LAZYCOMMIT; - /* - * Don't continue in the for loop. (We can't - * anyway, it's unsafe!) We want to go back to - * the beginning of the list. - */ - break; - } - - /* If there was nothing to do, don't continue */ - if (!WorkDone) - break; - } - /* In case a wakeup came while all threads were active */ - jfs_commit_thread_waking = 0; - - if (freezing(current)) { - LAZY_UNLOCK(flags); - try_to_freeze(); - } else { - DECLARE_WAITQUEUE(wq, current); - - add_wait_queue(&jfs_commit_thread_wait, &wq); - set_current_state(TASK_INTERRUPTIBLE); - LAZY_UNLOCK(flags); - schedule(); - __set_current_state(TASK_RUNNING); - remove_wait_queue(&jfs_commit_thread_wait, &wq); - } - } while (!kthread_should_stop()); - - if (!list_empty(&TxAnchor.unlock_queue)) - jfs_err("jfs_lazycommit being killed w/pending transactions!"); - else - jfs_info("jfs_lazycommit being killed\n"); - return 0; -} - -void txLazyUnlock(struct tblock * tblk) -{ - unsigned long flags; - - LAZY_LOCK(flags); - - list_add_tail(&tblk->cqueue, &TxAnchor.unlock_queue); - /* - * Don't wake up a commit thread if there is already one servicing - * this superblock, or if the last one we woke up hasn't started yet. - */ - if (!(JFS_SBI(tblk->sb)->commit_state & IN_LAZYCOMMIT) && - !jfs_commit_thread_waking) { - jfs_commit_thread_waking = 1; - wake_up(&jfs_commit_thread_wait); - } - LAZY_UNLOCK(flags); -} - -static void LogSyncRelease(struct metapage * mp) -{ - struct jfs_log *log = mp->log; - - assert(mp->nohomeok); - assert(log); - metapage_homeok(mp); -} - -/* - * txQuiesce - * - * Block all new transactions and push anonymous transactions to - * completion - * - * This does almost the same thing as jfs_sync below. We don't - * worry about deadlocking when jfs_tlocks_low is set, since we would - * expect jfs_sync to get us out of that jam. - */ -void txQuiesce(struct super_block *sb) -{ - struct inode *ip; - struct jfs_inode_info *jfs_ip; - struct jfs_log *log = JFS_SBI(sb)->log; - tid_t tid; - - set_bit(log_QUIESCE, &log->flag); - - TXN_LOCK(); -restart: - while (!list_empty(&TxAnchor.anon_list)) { - jfs_ip = list_entry(TxAnchor.anon_list.next, - struct jfs_inode_info, - anon_inode_list); - ip = &jfs_ip->vfs_inode; - - /* - * inode will be removed from anonymous list - * when it is committed - */ - TXN_UNLOCK(); - tid = txBegin(ip->i_sb, COMMIT_INODE | COMMIT_FORCE); - mutex_lock(&jfs_ip->commit_mutex); - txCommit(tid, 1, &ip, 0); - txEnd(tid); - mutex_unlock(&jfs_ip->commit_mutex); - /* - * Just to be safe. I don't know how - * long we can run without blocking - */ - cond_resched(); - TXN_LOCK(); - } - - /* - * If jfs_sync is running in parallel, there could be some inodes - * on anon_list2. Let's check. - */ - if (!list_empty(&TxAnchor.anon_list2)) { - list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list); - INIT_LIST_HEAD(&TxAnchor.anon_list2); - goto restart; - } - TXN_UNLOCK(); - - /* - * We may need to kick off the group commit - */ - jfs_flush_journal(log, 0); -} - -/* - * txResume() - * - * Allows transactions to start again following txQuiesce - */ -void txResume(struct super_block *sb) -{ - struct jfs_log *log = JFS_SBI(sb)->log; - - clear_bit(log_QUIESCE, &log->flag); - TXN_WAKEUP(&log->syncwait); -} - -/* - * jfs_sync(void) - * - * To be run as a kernel daemon. This is awakened when tlocks run low. - * We write any inodes that have anonymous tlocks so they will become - * available. - */ -int jfs_sync(void *arg) -{ - struct inode *ip; - struct jfs_inode_info *jfs_ip; - tid_t tid; - - do { - /* - * write each inode on the anonymous inode list - */ - TXN_LOCK(); - while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) { - jfs_ip = list_entry(TxAnchor.anon_list.next, - struct jfs_inode_info, - anon_inode_list); - ip = &jfs_ip->vfs_inode; - - if (! igrab(ip)) { - /* - * Inode is being freed - */ - list_del_init(&jfs_ip->anon_inode_list); - } else if (mutex_trylock(&jfs_ip->commit_mutex)) { - /* - * inode will be removed from anonymous list - * when it is committed - */ - TXN_UNLOCK(); - tid = txBegin(ip->i_sb, COMMIT_INODE); - txCommit(tid, 1, &ip, 0); - txEnd(tid); - mutex_unlock(&jfs_ip->commit_mutex); - - iput(ip); - /* - * Just to be safe. I don't know how - * long we can run without blocking - */ - cond_resched(); - TXN_LOCK(); - } else { - /* We can't get the commit mutex. It may - * be held by a thread waiting for tlock's - * so let's not block here. Save it to - * put back on the anon_list. - */ - - /* Take off anon_list */ - list_del(&jfs_ip->anon_inode_list); - - /* Put on anon_list2 */ - list_add(&jfs_ip->anon_inode_list, - &TxAnchor.anon_list2); - - TXN_UNLOCK(); - iput(ip); - TXN_LOCK(); - } - } - /* Add anon_list2 back to anon_list */ - list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list); - - if (freezing(current)) { - TXN_UNLOCK(); - try_to_freeze(); - } else { - set_current_state(TASK_INTERRUPTIBLE); - TXN_UNLOCK(); - schedule(); - __set_current_state(TASK_RUNNING); - } - } while (!kthread_should_stop()); - - jfs_info("jfs_sync being killed"); - return 0; -} - -#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG) -static int jfs_txanchor_proc_show(struct seq_file *m, void *v) -{ - char *freewait; - char *freelockwait; - char *lowlockwait; - - freewait = - waitqueue_active(&TxAnchor.freewait) ? "active" : "empty"; - freelockwait = - waitqueue_active(&TxAnchor.freelockwait) ? "active" : "empty"; - lowlockwait = - waitqueue_active(&TxAnchor.lowlockwait) ? "active" : "empty"; - - seq_printf(m, - "JFS TxAnchor\n" - "============\n" - "freetid = %d\n" - "freewait = %s\n" - "freelock = %d\n" - "freelockwait = %s\n" - "lowlockwait = %s\n" - "tlocksInUse = %d\n" - "jfs_tlocks_low = %d\n" - "unlock_queue is %sempty\n", - TxAnchor.freetid, - freewait, - TxAnchor.freelock, - freelockwait, - lowlockwait, - TxAnchor.tlocksInUse, - jfs_tlocks_low, - list_empty(&TxAnchor.unlock_queue) ? "" : "not "); - return 0; -} - -static int jfs_txanchor_proc_open(struct inode *inode, struct file *file) -{ - return single_open(file, jfs_txanchor_proc_show, NULL); -} - -const struct file_operations jfs_txanchor_proc_fops = { - .owner = THIS_MODULE, - .open = jfs_txanchor_proc_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; -#endif - -#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS) -static int jfs_txstats_proc_show(struct seq_file *m, void *v) -{ - seq_printf(m, - "JFS TxStats\n" - "===========\n" - "calls to txBegin = %d\n" - "txBegin blocked by sync barrier = %d\n" - "txBegin blocked by tlocks low = %d\n" - "txBegin blocked by no free tid = %d\n" - "calls to txBeginAnon = %d\n" - "txBeginAnon blocked by sync barrier = %d\n" - "txBeginAnon blocked by tlocks low = %d\n" - "calls to txLockAlloc = %d\n" - "tLockAlloc blocked by no free lock = %d\n", - TxStat.txBegin, - TxStat.txBegin_barrier, - TxStat.txBegin_lockslow, - TxStat.txBegin_freetid, - TxStat.txBeginAnon, - TxStat.txBeginAnon_barrier, - TxStat.txBeginAnon_lockslow, - TxStat.txLockAlloc, - TxStat.txLockAlloc_freelock); - return 0; -} - -static int jfs_txstats_proc_open(struct inode *inode, struct file *file) -{ - return single_open(file, jfs_txstats_proc_show, NULL); -} - -const struct file_operations jfs_txstats_proc_fops = { - .owner = THIS_MODULE, - .open = jfs_txstats_proc_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; -#endif |