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linux-zen-server/fs/jfs/jfs_txnmgr.c

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// 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;
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
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