[PATCH] JFS: Support page sizes greater than 4K

jfs has never worked on architecutures where the page size was not 4K.
Signed-off-by: NDave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/jfs/inode.c

@@ -175,31 +175,22 @@ jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
 {
 	s64 lblock64 = lblock;
 	int rc = 0;
-	int take_locks;
 	xad_t xad;
 	s64 xaddr;
 	int xflag;
 	s32 xlen;
 
-	/*
-	 * If this is a special inode (imap, dmap)
-	 * the lock should already be taken
-	 */
-	take_locks = (JFS_IP(ip)->fileset != AGGREGATE_I);
-
 	/*
 	 * Take appropriate lock on inode
 	 */
-	if (take_locks) {
 	if (create)
 		IWRITE_LOCK(ip);
 	else
 		IREAD_LOCK(ip);
-	}
 
 	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
-	    (xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)
-	     == 0) && xlen) {
+	    (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
+	    xlen) {
 		if (xflag & XAD_NOTRECORDED) {
 			if (!create)
 				/*
@@ -258,12 +249,10 @@ jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
 	/*
 	 * Release lock on inode
 	 */
-	if (take_locks) {
 	if (create)
 		IWRITE_UNLOCK(ip);
 	else
 		IREAD_UNLOCK(ip);
-	}
 	return rc;
 }
 

fs/jfs/jfs_dmap.c

@@ -471,6 +471,7 @@ dbUpdatePMap(struct inode *ipbmap,
 	struct metapage *mp;
 	struct jfs_log *log;
 	int lsn, difft, diffp;
+	unsigned long flags;
 
 	/* the blocks better be within the mapsize. */
 	if (blkno + nblocks > bmp->db_mapsize) {
@@ -504,6 +505,7 @@ dbUpdatePMap(struct inode *ipbmap,
 					   0);
 			if (mp == NULL)
 				return -EIO;
+			metapage_wait_for_io(mp);
 		}
 		dp = (struct dmap *) mp->data;
 
@@ -578,34 +580,32 @@ dbUpdatePMap(struct inode *ipbmap,
 		if (mp->lsn != 0) {
 			/* inherit older/smaller lsn */
 			logdiff(diffp, mp->lsn, log);
+			LOGSYNC_LOCK(log, flags);
 			if (difft < diffp) {
 				mp->lsn = lsn;
 
 				/* move bp after tblock in logsync list */
-				LOGSYNC_LOCK(log);
 				list_move(&mp->synclist, &tblk->synclist);
-				LOGSYNC_UNLOCK(log);
 			}
 
 			/* inherit younger/larger clsn */
-			LOGSYNC_LOCK(log);
 			logdiff(difft, tblk->clsn, log);
 			logdiff(diffp, mp->clsn, log);
 			if (difft > diffp)
 				mp->clsn = tblk->clsn;
-			LOGSYNC_UNLOCK(log);
+			LOGSYNC_UNLOCK(log, flags);
 		} else {
 			mp->log = log;
 			mp->lsn = lsn;
 
 			/* insert bp after tblock in logsync list */
-			LOGSYNC_LOCK(log);
+			LOGSYNC_LOCK(log, flags);
 
 			log->count++;
 			list_add(&mp->synclist, &tblk->synclist);
 
 			mp->clsn = tblk->clsn;
-			LOGSYNC_UNLOCK(log);
+			LOGSYNC_UNLOCK(log, flags);
 		}
 	}
 

fs/jfs/jfs_imap.c

@@ -502,7 +502,7 @@ struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
 
 	}
 
-	ip->i_mapping->a_ops = &jfs_aops;
+	ip->i_mapping->a_ops = &jfs_metapage_aops;
 	mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);
 
 	/* Allocations to metadata inodes should not affect quotas */
@@ -2791,6 +2791,7 @@ diUpdatePMap(struct inode *ipimap,
 	u32 mask;
 	struct jfs_log *log;
 	int lsn, difft, diffp;
+	unsigned long flags;
 
 	imap = JFS_IP(ipimap)->i_imap;
 	/* get the iag number containing the inode */
@@ -2807,6 +2808,7 @@ diUpdatePMap(struct inode *ipimap,
 	IREAD_UNLOCK(ipimap);
 	if (rc)
 		return (rc);
+	metapage_wait_for_io(mp);
 	iagp = (struct iag *) mp->data;
 	/* get the inode number and extent number of the inode within
 	 * the iag and the inode number within the extent.
@@ -2870,30 +2872,28 @@ diUpdatePMap(struct inode *ipimap,
 		/* inherit older/smaller lsn */
 		logdiff(difft, lsn, log);
 		logdiff(diffp, mp->lsn, log);
+		LOGSYNC_LOCK(log, flags);
 		if (difft < diffp) {
 			mp->lsn = lsn;
 			/* move mp after tblock in logsync list */
-			LOGSYNC_LOCK(log);
 			list_move(&mp->synclist, &tblk->synclist);
-			LOGSYNC_UNLOCK(log);
 		}
 		/* inherit younger/larger clsn */
-		LOGSYNC_LOCK(log);
 		assert(mp->clsn);
 		logdiff(difft, tblk->clsn, log);
 		logdiff(diffp, mp->clsn, log);
 		if (difft > diffp)
 			mp->clsn = tblk->clsn;
-		LOGSYNC_UNLOCK(log);
+		LOGSYNC_UNLOCK(log, flags);
 	} else {
 		mp->log = log;
 		mp->lsn = lsn;
 		/* insert mp after tblock in logsync list */
-		LOGSYNC_LOCK(log);
+		LOGSYNC_LOCK(log, flags);
 		log->count++;
 		list_add(&mp->synclist, &tblk->synclist);
 		mp->clsn = tblk->clsn;
-		LOGSYNC_UNLOCK(log);
+		LOGSYNC_UNLOCK(log, flags);
 	}
 	write_metapage(mp);
 	return (0);

fs/jfs/jfs_incore.h

@@ -165,6 +165,7 @@ struct jfs_sb_info {
         /* Formerly in ipbmap */
 	struct bmap	*bmap;		/* incore bmap descriptor	*/
 	struct nls_table *nls_tab;	/* current codepage		*/
+	struct inode *direct_inode;	/* metadata inode */
 	uint		state;		/* mount/recovery state	*/
 	unsigned long	flag;		/* mount time flags */
 	uint		p_state;	/* state prior to going no integrity */

fs/jfs/jfs_logmgr.c

@@ -234,6 +234,7 @@ int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 	int lsn;
 	int diffp, difft;
 	struct metapage *mp = NULL;
+	unsigned long flags;
 
 	jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p",
 		 log, tblk, lrd, tlck);
@@ -254,7 +255,7 @@ int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 	 */
 	lsn = log->lsn;
 
-	LOGSYNC_LOCK(log);
+	LOGSYNC_LOCK(log, flags);
 
 	/*
 	 * initialize page lsn if first log write of the page
@@ -310,7 +311,7 @@ int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 		}
 	}
 
-	LOGSYNC_UNLOCK(log);
+	LOGSYNC_UNLOCK(log, flags);
 
 	/*
 	 *      write the log record
@@ -334,7 +335,6 @@ int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 	return lsn;
 }
 
-
 /*
  * NAME:	lmWriteRecord()
  *
@@ -945,6 +945,15 @@ static int lmLogSync(struct jfs_log * log, int nosyncwait)
 	struct lrd lrd;
 	int lsn;
 	struct logsyncblk *lp;
+	struct jfs_sb_info *sbi;
+	unsigned long flags;
+
+	/* push dirty metapages out to disk */
+	list_for_each_entry(sbi, &log->sb_list, log_list) {
+		filemap_flush(sbi->ipbmap->i_mapping);
+		filemap_flush(sbi->ipimap->i_mapping);
+		filemap_flush(sbi->direct_inode->i_mapping);
+	}
 
 	/*
 	 *      forward syncpt
@@ -954,10 +963,7 @@ static int lmLogSync(struct jfs_log * log, int nosyncwait)
 	 */
 
 	if (log->sync == log->syncpt) {
-		LOGSYNC_LOCK(log);
-		/* ToDo: push dirty metapages out to disk */
-//              bmLogSync(log);
-
+		LOGSYNC_LOCK(log, flags);
 		if (list_empty(&log->synclist))
 			log->sync = log->lsn;
 		else {
@@ -965,7 +971,7 @@ static int lmLogSync(struct jfs_log * log, int nosyncwait)
 					struct logsyncblk, synclist);
 			log->sync = lp->lsn;
 		}
-		LOGSYNC_UNLOCK(log);
+		LOGSYNC_UNLOCK(log, flags);
 
 	}
 
@@ -974,27 +980,6 @@ static int lmLogSync(struct jfs_log * log, int nosyncwait)
 	 * reset syncpt = sync
 	 */
 	if (log->sync != log->syncpt) {
-		struct jfs_sb_info *sbi;
-
-		/*
-		 * We need to make sure all of the "written" metapages
-		 * actually make it to disk
-		 */
-		list_for_each_entry(sbi, &log->sb_list, log_list) {
-			if (sbi->flag & JFS_NOINTEGRITY)
-				continue;
-			filemap_fdatawrite(sbi->ipbmap->i_mapping);
-			filemap_fdatawrite(sbi->ipimap->i_mapping);
-			filemap_fdatawrite(sbi->sb->s_bdev->bd_inode->i_mapping);
-		}
-		list_for_each_entry(sbi, &log->sb_list, log_list) {
-			if (sbi->flag & JFS_NOINTEGRITY)
-				continue;
-			filemap_fdatawait(sbi->ipbmap->i_mapping);
-			filemap_fdatawait(sbi->ipimap->i_mapping);
-			filemap_fdatawait(sbi->sb->s_bdev->bd_inode->i_mapping);
-		}
-
 		lrd.logtid = 0;
 		lrd.backchain = 0;
 		lrd.type = cpu_to_le16(LOG_SYNCPT);
@@ -1547,6 +1532,7 @@ void jfs_flush_journal(struct jfs_log *log, int wait)
 {
 	int i;
 	struct tblock *target = NULL;
+	struct jfs_sb_info *sbi;
 
 	/* jfs_write_inode may call us during read-only mount */
 	if (!log)
@@ -1608,12 +1594,18 @@ void jfs_flush_journal(struct jfs_log *log, int wait)
 	if (wait < 2)
 		return;
 
+	list_for_each_entry(sbi, &log->sb_list, log_list) {
+		filemap_fdatawrite(sbi->ipbmap->i_mapping);
+		filemap_fdatawrite(sbi->ipimap->i_mapping);
+		filemap_fdatawrite(sbi->direct_inode->i_mapping);
+	}
+
 	/*
 	 * If there was recent activity, we may need to wait
 	 * for the lazycommit thread to catch up
 	 */
 	if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
-		for (i = 0; i < 800; i++) {	/* Too much? */
+		for (i = 0; i < 200; i++) {	/* Too much? */
 			msleep(250);
 			if (list_empty(&log->cqueue) &&
 			    list_empty(&log->synclist))
@@ -1621,7 +1613,24 @@ void jfs_flush_journal(struct jfs_log *log, int wait)
 		}
 	}
 	assert(list_empty(&log->cqueue));
-	assert(list_empty(&log->synclist));
+	if (!list_empty(&log->synclist)) {
+		struct logsyncblk *lp;
+
+		list_for_each_entry(lp, &log->synclist, synclist) {
+			if (lp->xflag & COMMIT_PAGE) {
+				struct metapage *mp = (struct metapage *)lp;
+				dump_mem("orphan metapage", lp,
+					 sizeof(struct metapage));
+				dump_mem("page", mp->page, sizeof(struct page));
+			}
+			else
+				dump_mem("orphan tblock", lp,
+					 sizeof(struct tblock));
+		}
+//		current->state = TASK_INTERRUPTIBLE;
+//		schedule();
+	}
+	//assert(list_empty(&log->synclist));
 	clear_bit(log_FLUSH, &log->flag);
 }
 

fs/jfs/jfs_logmgr.h

@@ -490,8 +490,9 @@ struct logsyncblk {
  */
 
 #define LOGSYNC_LOCK_INIT(log) spin_lock_init(&(log)->synclock)
-#define LOGSYNC_LOCK(log) spin_lock(&(log)->synclock)
-#define LOGSYNC_UNLOCK(log) spin_unlock(&(log)->synclock)
+#define LOGSYNC_LOCK(log, flags) spin_lock_irqsave(&(log)->synclock, flags)
+#define LOGSYNC_UNLOCK(log, flags) \
+	spin_unlock_irqrestore(&(log)->synclock, flags)
 
 /* compute the difference in bytes of lsn from sync point */
 #define logdiff(diff, lsn, log)\

fs/jfs/jfs_metapage.h

@@ -33,38 +33,27 @@ struct metapage {
 	unsigned long flag;	/* See Below */
 	unsigned long count;	/* Reference count */
 	void *data;		/* Data pointer */
-
-	/* list management stuff */
-	struct metapage *hash_prev;
-	struct metapage *hash_next;	/* Also used for free list */
-
-	/*
-	 * mapping & index become redundant, but we need these here to
-	 * add the metapage to the hash before we have the real page
-	 */
-	struct address_space *mapping;
-	unsigned long index;
+	sector_t index; 	/* block address of page */
 	wait_queue_head_t wait;
 
 	/* implementation */
 	struct page *page;
-	unsigned long logical_size;
+	unsigned int logical_size;
 
 	/* Journal management */
 	int clsn;
-	atomic_t nohomeok;
+	int nohomeok;
 	struct jfs_log *log;
 };
 
 /* metapage flag */
 #define META_locked	0
-#define META_absolute	1
-#define META_free	2
-#define META_dirty	3
-#define META_sync	4
-#define META_discard	5
-#define META_forced	6
-#define META_stale	7
+#define META_free	1
+#define META_dirty	2
+#define META_sync	3
+#define META_discard	4
+#define META_forcewrite	5
+#define META_io		6
 
 #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
 
@@ -80,7 +69,16 @@ extern struct metapage *__get_metapage(struct inode *inode,
 	 __get_metapage(inode, lblock, size, absolute, TRUE)
 
 extern void release_metapage(struct metapage *);
-extern void hold_metapage(struct metapage *, int);
+extern void grab_metapage(struct metapage *);
+extern void force_metapage(struct metapage *);
+
+/*
+ * hold_metapage and put_metapage are used in conjuction.  The page lock
+ * is not dropped between the two, so no other threads can get or release
+ * the metapage
+ */
+extern void hold_metapage(struct metapage *);
+extern void put_metapage(struct metapage *);
 
 static inline void write_metapage(struct metapage *mp)
 {
@@ -101,6 +99,46 @@ static inline void discard_metapage(struct metapage *mp)
 	release_metapage(mp);
 }
 
+static inline void metapage_nohomeok(struct metapage *mp)
+{
+	struct page *page = mp->page;
+	lock_page(page);
+	if (!mp->nohomeok++) {
+		mark_metapage_dirty(mp);
+		page_cache_get(page);
+		wait_on_page_writeback(page);
+	}
+	unlock_page(page);
+}
+
+/*
+ * This serializes access to mp->lsn when metapages are added to logsynclist
+ * without setting nohomeok.  i.e. updating imap & dmap
+ */
+static inline void metapage_wait_for_io(struct metapage *mp)
+{
+	if (test_bit(META_io, &mp->flag))
+		wait_on_page_writeback(mp->page);
+}
+
+/*
+ * This is called when already holding the metapage
+ */
+static inline void _metapage_homeok(struct metapage *mp)
+{
+	if (!--mp->nohomeok)
+		page_cache_release(mp->page);
+}
+
+static inline void metapage_homeok(struct metapage *mp)
+{
+	hold_metapage(mp);
+	_metapage_homeok(mp);
+	put_metapage(mp);
+}
+
+extern struct address_space_operations jfs_metapage_aops;
+
 /*
  * This routines invalidate all pages for an extent.
  */

fs/jfs/jfs_mount.c

@@ -285,11 +285,6 @@ int jfs_mount_rw(struct super_block *sb, int remount)
 	 */
 	logMOUNT(sb);
 
-	/*
-	 * Set page cache allocation policy
-	 */
-	mapping_set_gfp_mask(sb->s_bdev->bd_inode->i_mapping, GFP_NOFS);
-
 	return rc;
 }
 

fs/jfs/jfs_txnmgr.c

@@ -227,6 +227,7 @@ static lid_t txLockAlloc(void)
 
 static void txLockFree(lid_t lid)
 {
+	TxLock[lid].tid = 0;
 	TxLock[lid].next = TxAnchor.freelock;
 	TxAnchor.freelock = lid;
 	TxAnchor.tlocksInUse--;
@@ -633,8 +634,10 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 
 	/* is page locked by the requester transaction ? */
 	tlck = lid_to_tlock(lid);
-	if ((xtid = tlck->tid) == tid)
+	if ((xtid = tlck->tid) == tid) {
+		TXN_UNLOCK();
 		goto grantLock;
+	}
 
 	/*
 	 * is page locked by anonymous transaction/lock ?
@@ -649,6 +652,7 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 	 */
 	if (xtid == 0) {
 		tlck->tid = tid;
+		TXN_UNLOCK();
 		tblk = tid_to_tblock(tid);
 		/*
 		 * The order of the tlocks in the transaction is important
@@ -706,17 +710,18 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 	 */
 	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 */
-		mark_metapage_dirty(mp);
-		atomic_inc(&mp->nohomeok);
+		metapage_nohomeok(mp);
 
 		jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
-			 mp, atomic_read(&mp->nohomeok), tid, tlck);
+			 mp, mp->nohomeok, tid, tlck);
 
 		/* if anonymous transaction, and buffer is on the group
 		 * commit synclist, mark inode to show this.  This will
@@ -762,8 +767,10 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 		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();
 		}
 	}
 
@@ -821,8 +828,6 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
       grantLock:
 	tlck->type |= type;
 
-	TXN_UNLOCK();
-
 	return tlck;
 
 	/*
@@ -841,11 +846,19 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 		BUG();
 	}
 	INCREMENT(stattx.waitlock);	/* statistics */
+	TXN_UNLOCK();
 	release_metapage(mp);
+	TXN_LOCK();
+	xtid = tlck->tid;	/* reaquire 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;
@@ -906,6 +919,7 @@ static void txUnlock(struct tblock * tblk)
 	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;
@@ -925,19 +939,14 @@ static void txUnlock(struct tblock * tblk)
 			assert(mp->xflag & COMMIT_PAGE);
 
 			/* hold buffer
-			 *
-			 * It's possible that someone else has the metapage.
-			 * The only things were changing are nohomeok, which
-			 * is handled atomically, and clsn which is protected
-			 * by the LOGSYNC_LOCK.
 			 */
-			hold_metapage(mp, 1);
+			hold_metapage(mp);
 
-			assert(atomic_read(&mp->nohomeok) > 0);
-			atomic_dec(&mp->nohomeok);
+			assert(mp->nohomeok > 0);
+			_metapage_homeok(mp);
 
 			/* inherit younger/larger clsn */
-			LOGSYNC_LOCK(log);
+			LOGSYNC_LOCK(log, flags);
 			if (mp->clsn) {
 				logdiff(difft, tblk->clsn, log);
 				logdiff(diffp, mp->clsn, log);
@@ -945,16 +954,11 @@ static void txUnlock(struct tblock * tblk)
 					mp->clsn = tblk->clsn;
 			} else
 				mp->clsn = tblk->clsn;
-			LOGSYNC_UNLOCK(log);
+			LOGSYNC_UNLOCK(log, flags);
 
 			assert(!(tlck->flag & tlckFREEPAGE));
 
-			if (tlck->flag & tlckWRITEPAGE) {
-				write_metapage(mp);
-			} else {
-				/* release page which has been forced */
-				release_metapage(mp);
-			}
+			put_metapage(mp);
 		}
 
 		/* insert tlock, and linelock(s) of the tlock if any,
@@ -981,10 +985,10 @@ static void txUnlock(struct tblock * tblk)
 	 * has been inserted in logsync list at txUpdateMap())
 	 */
 	if (tblk->lsn) {
-		LOGSYNC_LOCK(log);
+		LOGSYNC_LOCK(log, flags);
 		log->count--;
 		list_del(&tblk->synclist);
-		LOGSYNC_UNLOCK(log);
+		LOGSYNC_UNLOCK(log, flags);
 	}
 }
 
@@ -1573,8 +1577,8 @@ static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 		 * the last entry, so don't bother logging this
 		 */
 		mp->lid = 0;
-		hold_metapage(mp, 0);
-		atomic_dec(&mp->nohomeok);
+		grab_metapage(mp);
+		metapage_homeok(mp);
 		discard_metapage(mp);
 		tlck->mp = NULL;
 		return 0;
@@ -2270,7 +2274,8 @@ void txForce(struct tblock * tblk)
 				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.
@@ -2282,9 +2287,10 @@ void txForce(struct tblock * tblk)
 				 * we can get by with synchronously writing
 				 * the pages when they are released.
 				 */
-				assert(atomic_read(&mp->nohomeok));
+				assert(mp->nohomeok);
 				set_bit(META_dirty, &mp->flag);
 				set_bit(META_sync, &mp->flag);
+#endif
 			}
 		}
 	}
@@ -2344,7 +2350,7 @@ static void txUpdateMap(struct tblock * tblk)
 			 */
 			mp = tlck->mp;
 			ASSERT(mp->xflag & COMMIT_PAGE);
-			hold_metapage(mp, 0);
+			grab_metapage(mp);
 		}
 
 		/*
@@ -2394,8 +2400,8 @@ static void txUpdateMap(struct tblock * tblk)
 				ASSERT(mp->lid == lid);
 				tlck->mp->lid = 0;
 			}
-			assert(atomic_read(&mp->nohomeok) == 1);
-			atomic_dec(&mp->nohomeok);
+			assert(mp->nohomeok == 1);
+			metapage_homeok(mp);
 			discard_metapage(mp);
 			tlck->mp = NULL;
 		}
@@ -2861,24 +2867,9 @@ static void LogSyncRelease(struct metapage * mp)
 {
 	struct jfs_log *log = mp->log;
 
-	assert(atomic_read(&mp->nohomeok));
+	assert(mp->nohomeok);
 	assert(log);
-	atomic_dec(&mp->nohomeok);
-
-	if (atomic_read(&mp->nohomeok))
-		return;
-
-	hold_metapage(mp, 0);
-
-	LOGSYNC_LOCK(log);
-	mp->log = NULL;
-	mp->lsn = 0;
-	mp->clsn = 0;
-	log->count--;
-	list_del_init(&mp->synclist);
-	LOGSYNC_UNLOCK(log);
-
-	release_metapage(mp);
+	metapage_homeok(mp);
 }
 
 /*

fs/jfs/jfs_umount.c

@@ -49,7 +49,6 @@
  */
 int jfs_umount(struct super_block *sb)
 {
-	struct address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
 	struct jfs_sb_info *sbi = JFS_SBI(sb);
 	struct inode *ipbmap = sbi->ipbmap;
 	struct inode *ipimap = sbi->ipimap;
@@ -109,8 +108,8 @@ int jfs_umount(struct super_block *sb)
 	 * Make sure all metadata makes it to disk before we mark
 	 * the superblock as clean
 	 */
-	filemap_fdatawrite(bdev_mapping);
-	filemap_fdatawait(bdev_mapping);
+	filemap_fdatawrite(sbi->direct_inode->i_mapping);
+	filemap_fdatawait(sbi->direct_inode->i_mapping);
 
 	/*
 	 * ensure all file system file pages are propagated to their
@@ -123,9 +122,6 @@ int jfs_umount(struct super_block *sb)
 	if (log) {		/* log = NULL if read-only mount */
 		updateSuper(sb, FM_CLEAN);
 
-		/* Restore default gfp_mask for bdev */
-		mapping_set_gfp_mask(bdev_mapping, GFP_USER);
-
 		/*
 		 * close log: 
 		 *
@@ -140,7 +136,6 @@ int jfs_umount(struct super_block *sb)
 
 int jfs_umount_rw(struct super_block *sb)
 {
-	struct address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
 	struct jfs_sb_info *sbi = JFS_SBI(sb);
 	struct jfs_log *log = sbi->log;
 
@@ -166,13 +161,10 @@ int jfs_umount_rw(struct super_block *sb)
 	 * mark the superblock clean before everything is flushed to
 	 * disk.
 	 */
-	filemap_fdatawrite(bdev_mapping);
-	filemap_fdatawait(bdev_mapping);
+	filemap_fdatawrite(sbi->direct_inode->i_mapping);
+	filemap_fdatawait(sbi->direct_inode->i_mapping);
 
 	updateSuper(sb, FM_CLEAN);
 
-	/* Restore default gfp_mask for bdev */
-	mapping_set_gfp_mask(bdev_mapping, GFP_USER);
-
 	return lmLogClose(sb);
 }

fs/jfs/resize.c

@@ -209,6 +209,9 @@ int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
 	 */
 	txQuiesce(sb);
 
+	/* Reset size of direct inode */
+	sbi->direct_inode->i_size =  sb->s_bdev->bd_inode->i_size;
+
 	if (sbi->mntflag & JFS_INLINELOG) {
 		/*
 		 * deactivate old inline log

fs/jfs/super.c

@@ -210,6 +210,10 @@ static void jfs_put_super(struct super_block *sb)
 		unload_nls(sbi->nls_tab);
 	sbi->nls_tab = NULL;
 
+	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
+	iput(sbi->direct_inode);
+	sbi->direct_inode = NULL;
+
 	kfree(sbi);
 }
 
@@ -358,6 +362,12 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data)
 	}
 
 	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
+		/*
+		 * Invalidate any previously read metadata.  fsck may have
+		 * changed the on-disk data since we mounted r/o
+		 */
+		truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
+
 		JFS_SBI(sb)->flag = flag;
 		return jfs_mount_rw(sb, 1);
 	}
@@ -428,12 +438,26 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_op = &jfs_super_operations;
 	sb->s_export_op = &jfs_export_operations;
 
+	/*
+	 * Initialize direct-mapping inode/address-space
+	 */
+	inode = new_inode(sb);
+	if (inode == NULL)
+		goto out_kfree;
+	inode->i_ino = 0;
+	inode->i_nlink = 1;
+	inode->i_size = sb->s_bdev->bd_inode->i_size;
+	inode->i_mapping->a_ops = &jfs_metapage_aops;
+	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+
+	sbi->direct_inode = inode;
+
 	rc = jfs_mount(sb);
 	if (rc) {
 		if (!silent) {
 			jfs_err("jfs_mount failed w/return code = %d", rc);
 		}
-		goto out_kfree;
+		goto out_mount_failed;
 	}
 	if (sb->s_flags & MS_RDONLY)
 		sbi->log = NULL;
@@ -482,6 +506,13 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	if (rc) {
 		jfs_err("jfs_umount failed with return code %d", rc);
 	}
+out_mount_failed:
+	filemap_fdatawrite(sbi->direct_inode->i_mapping);
+	filemap_fdatawait(sbi->direct_inode->i_mapping);
+	truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
+	make_bad_inode(sbi->direct_inode);
+	iput(sbi->direct_inode);
+	sbi->direct_inode = NULL;
 out_kfree:
 	if (sbi->nls_tab)
 		unload_nls(sbi->nls_tab);