diff options
Diffstat (limited to 'fs/jfs/jfs_txnmgr.c')
| -rw-r--r-- | fs/jfs/jfs_txnmgr.c | 3017 |
1 files changed, 3017 insertions, 0 deletions
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c new file mode 100644 index 0000000000..ce4b4760fc --- /dev/null +++ b/fs/jfs/jfs_txnmgr.c @@ -0,0 +1,3017 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) International Business Machines Corp., 2000-2005 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + */ + +/* + * 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(); + 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 void diLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd, + struct tlock *tlck, struct commit *cd); +static void 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 void 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; + + if (!log) { + jfs_error(sb, "read-only filesystem\n"); + return 0; + } + + 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. + */ + txLog(log, tblk, &cd); + + /* + * 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 void txLog(struct jfs_log *log, struct tblock *tblk, struct commit *cd) +{ + 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; +} + +/* + * diLog() + * + * function: log inode tlock and format maplock to update bmap; + */ +static void diLog(struct jfs_log *log, struct tblock *tblk, struct lrd *lrd, + struct tlock *tlck, struct commit *cd) +{ + 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 + * extent is 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); + return; +} + +/* + * dataLog() + * + * function: log data tlock + */ +static void 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; + } + + 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; +} + +/* + * 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"); + 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) { + pxd_t 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, "\n"); + + 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(); + 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"); + 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_init(&TxAnchor.anon_list2, &TxAnchor.anon_list); + 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. + */ + + /* Move from anon_list to anon_list2 */ + list_move(&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(); + } + } while (!kthread_should_stop()); + + jfs_info("jfs_sync being killed"); + return 0; +} + +#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG) +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; +} +#endif + +#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS) +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; +} +#endif |