Add resize function to JFS

This is invoked by mount -remount,resize=<blocks>.
See Documentation/filesystems/jfs.txt for more information.

Documentation/filesystems/jfs.txt

@@ -17,11 +17,16 @@ iocharset=name	Character set to use for converting from Unicode to
 		translations.  This requires CONFIG_NLS_UTF8 to be set
 		in the kernel .config file.
 
+resize=value	Resize the volume to <value> blocks.  JFS only supports
+		growing a volume, not shrinking it.  This option is only
+		valid during a remount, when the volume is mounted
+		read-write.  The resize keyword with no value will grow
+		the volume to the full size of the partition.
+
 JFS TODO list:
 
 Plans for our near term development items
 
-   - implement online resize for extending JFS volumes
    - enhance support for logfile on dedicated partition
    - get access control list functionality operational
    - get extended attributes functionality operational

fs/jfs/Makefile

@@ -8,7 +8,7 @@ jfs-objs := super.o file.o inode.o namei.o jfs_mount.o jfs_umount.o \
 	    jfs_xtree.o jfs_imap.o jfs_debug.o jfs_dmap.o \
 	    jfs_unicode.o jfs_dtree.o jfs_inode.o \
 	    jfs_extent.o symlink.o jfs_metapage.o \
-	    jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o
+	    jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o resize.o
 
 EXTRA_CFLAGS += -D_JFS_4K
 

fs/jfs/jfs_dmap.c

@@ -330,7 +330,7 @@ int dbSync(struct inode *ipbmap)
 	filemap_fdatawait(ipbmap->i_mapping);
 
 	ipbmap->i_state |= I_DIRTY;
-	diWriteSpecial(ipbmap);
+	diWriteSpecial(ipbmap, 0);
 
 	return (0);
 }
@@ -3175,7 +3175,7 @@ static int dbAllocDmapBU(bmap_t * bmp, dmap_t * dp, s64 blkno, int nblocks)
 			dp->wmap[word] |= cpu_to_le32(ONES << (DBWORD - nb)
 						      >> wbitno);
 
-			word += 1;
+			word++;
 		} else {
 			/* one or more dmap words are fully contained
 			 * within the block range.  determine how many
@@ -3187,6 +3187,7 @@ static int dbAllocDmapBU(bmap_t * bmp, dmap_t * dp, s64 blkno, int nblocks)
 
 			/* determine how many bits */
 			nb = nwords << L2DBWORD;
+			word += nwords;
 		}
 	}
 

fs/jfs/jfs_imap.c

@@ -285,7 +285,7 @@ int diSync(struct inode *ipimap)
 	filemap_fdatawrite(ipimap->i_mapping);
 	filemap_fdatawait(ipimap->i_mapping);
 
-	diWriteSpecial(ipimap);
+	diWriteSpecial(ipimap, 0);
 
 	return (0);
 }
@@ -450,12 +450,13 @@ int diRead(struct inode *ip)
  * PARAMETERS:
  *      sb - filesystem superblock
  *	inum - aggregate inode number
+ *	secondary - 1 if secondary aggregate inode table
  *
  * RETURN VALUES:
  *      new inode	- success
  *      NULL		- i/o error.
  */
-struct inode *diReadSpecial(struct super_block *sb, ino_t inum)
+struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
 {
 	struct jfs_sb_info *sbi = JFS_SBI(sb);
 	uint address;
@@ -470,21 +471,16 @@ struct inode *diReadSpecial(struct super_block *sb, ino_t inum)
 		return ip;
 	}
 
-	/*
-	 * If ip->i_number >= 32 (INOSPEREXT), then read from secondary
-	 * aggregate inode table.
-	 */
-
-	if (inum >= INOSPEREXT) {
-		address =
-		    addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
-		inum -= INOSPEREXT;
-		ASSERT(inum < INOSPEREXT);
+	if (secondary) {
+		address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
 		JFS_IP(ip)->ipimap = sbi->ipaimap2;
 	} else {
 		address = AITBL_OFF >> L2PSIZE;
 		JFS_IP(ip)->ipimap = sbi->ipaimap;
 	}
+
+	ASSERT(inum < INOSPEREXT);
+
 	ip->i_ino = inum;
 
 	address += inum >> 3;	/* 8 inodes per 4K page */
@@ -538,11 +534,12 @@ struct inode *diReadSpecial(struct super_block *sb, ino_t inum)
  *
  * PARAMETERS:
  *      ip - special inode
+ *	secondary - 1 if secondary aggregate inode table
  *
  * RETURN VALUES: none
  */
 
-void diWriteSpecial(struct inode *ip)
+void diWriteSpecial(struct inode *ip, int secondary)
 {
 	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
 	uint address;
@@ -550,24 +547,14 @@ void diWriteSpecial(struct inode *ip)
 	ino_t inum = ip->i_ino;
 	metapage_t *mp;
 
-	/*
-	 * If ip->i_number >= 32 (INOSPEREXT), then write to secondary
-	 * aggregate inode table.
-	 */
-
-	if (!(ip->i_state & I_DIRTY))
-		return;
-
 	ip->i_state &= ~I_DIRTY;
 
-	if (inum >= INOSPEREXT) {
-		address =
-		    addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
-		inum -= INOSPEREXT;
-		ASSERT(inum < INOSPEREXT);
-	} else {
+	if (secondary)
+		address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
+	else
 		address = AITBL_OFF >> L2PSIZE;
-	}
+
+	ASSERT(inum < INOSPEREXT);
 
 	address += inum >> 3;	/* 8 inodes per 4K page */
 
@@ -2996,7 +2983,7 @@ duplicateIXtree(struct super_block *sb, s64 blkno, int xlen, s64 * xaddr)
 	/* if AIT2 ipmap2 is bad, do not try to update it */
 	if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT)	/* s_flag */
 		return;
-	ip = diReadSpecial(sb, FILESYSTEM_I + INOSPEREXT);
+	ip = diReadSpecial(sb, FILESYSTEM_I, 1);
 	if (ip == 0) {
 		JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
 		if ((rc = readSuper(sb, &mpsuper)))

fs/jfs/jfs_imap.h

@@ -146,15 +146,12 @@ extern int diSync(struct inode *);
 /* external references */
 extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
 			boolean_t is_free, tblock_t * tblk);
-#ifdef _STILL_TO_PORT
-extern int diExtendFS(inode_t * ipimap, inode_t * ipbmap);
-#endif				/* _STILL_TO_PORT */
-
+extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
 extern int diMount(struct inode *);
 extern int diUnmount(struct inode *, int);
 extern int diRead(struct inode *);
-extern struct inode *diReadSpecial(struct super_block *, ino_t);
-extern void diWriteSpecial(struct inode *);
+extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
+extern void diWriteSpecial(struct inode *, int);
 extern void diFreeSpecial(struct inode *);
 extern int diWrite(tid_t tid, struct inode *);
 #endif				/* _H_JFS_IMAP */

fs/jfs/jfs_incore.h

@@ -136,6 +136,7 @@ struct jfs_sb_info {
 	u32		logdev;		/* 2: external log device	*/
 	uint		aggregate;	/* volume identifier in log record */
 	pxd_t		logpxd;		/* 8: pxd describing log	*/
+	pxd_t		fsckpxd;	/* 8: pxd describing fsck wkspc */
 	pxd_t		ait2;		/* 8: pxd describing AIT copy	*/
 	char		uuid[16];	/* 16: 128-bit uuid for volume	*/
 	char		loguuid[16];	/* 16: 128-bit uuid for log	*/

fs/jfs/jfs_logmgr.c

@@ -172,8 +172,6 @@ static int lmWriteRecord(log_t * log, tblock_t * tblk, lrd_t * lrd,
 
 static int lmNextPage(log_t * log);
 static int lmLogFileSystem(log_t * log, char *uuid, int activate);
-static int lmLogInit(log_t * log);
-static int lmLogShutdown(log_t * log);
 
 static int lbmLogInit(log_t * log);
 static void lbmLogShutdown(log_t * log);
@@ -1037,7 +1035,7 @@ int lmLogSync(log_t * log, int nosyncwait)
 	 * by setting syncbarrier flag.
 	 */
 	if (written > LOGSYNC_BARRIER(logsize) && logsize > 32 * LOGPSIZE) {
-		log->syncbarrier = 1;
+		set_bit(log_SYNCBARRIER, &log->flag);
 		jFYI(1, ("log barrier on: lsn=0x%x syncpt=0x%x\n", lsn,
 			 log->syncpt));
 	}
@@ -1068,6 +1066,7 @@ int lmLogOpen(struct super_block *sb, log_t ** logptr)
 	if (!(log = kmalloc(sizeof(log_t), GFP_KERNEL)))
 		return ENOMEM;
 	memset(log, 0, sizeof(log_t));
+	init_waitqueue_head(&log->syncwait);
 
 	log->sb = sb;		/* This should be a list */
 
@@ -1080,7 +1079,7 @@ int lmLogOpen(struct super_block *sb, log_t ** logptr)
 	 * file system to log have 1-to-1 relationship;
 	 */
 
-	log->flag = JFS_INLINELOG;
+	set_bit(log_INLINELOG, &log->flag);
 	log->bdev = sb->s_bdev;
 	log->base = addressPXD(&JFS_SBI(sb)->logpxd);
 	log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >>
@@ -1175,7 +1174,7 @@ int lmLogOpen(struct super_block *sb, log_t ** logptr)
  *			
  * serialization: single first open thread
  */
-static int lmLogInit(log_t * log)
+int lmLogInit(log_t * log)
 {
 	int rc = 0;
 	lrd_t lrd;
@@ -1203,7 +1202,7 @@ static int lmLogInit(log_t * log)
 	 */
 
 
-	if (!(log->flag & JFS_INLINELOG))
+	if (!test_bit(log_INLINELOG, &log->flag))
 		log->l2bsize = 12;	/* XXX kludge alert XXX */
 	if ((rc = lbmRead(log, 1, &bpsuper)))
 		goto errout10;
@@ -1224,7 +1223,7 @@ static int lmLogInit(log_t * log)
 	}
 
 	/* initialize log inode from log superblock */
-	if (log->flag & JFS_INLINELOG) {
+	if (test_bit(log_INLINELOG,&log->flag)) {
 		if (log->size != le32_to_cpu(logsuper->size)) {
 			rc = EINVAL;
 			goto errout20;
@@ -1244,10 +1243,6 @@ static int lmLogInit(log_t * log)
 		      log, (unsigned long long) log->base, log->size));
 	}
 
-	log->flag |= JFS_GROUPCOMMIT;
-/*
-	log->flag |= JFS_LAZYCOMMIT;
-*/
 	log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
 	log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
 
@@ -1309,7 +1304,6 @@ static int lmLogInit(log_t * log)
 	log->syncpt = lsn;
 	log->sync = log->syncpt;
 	log->nextsync = LOGSYNC_DELTA(log->logsize);
-	init_waitqueue_head(&log->syncwait);
 
 	jFYI(1, ("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x\n",
 		 log->lsn, log->syncpt, log->sync));
@@ -1377,7 +1371,7 @@ int lmLogClose(struct super_block *sb, log_t * log)
 
 	jFYI(1, ("lmLogClose: log:0x%p\n", log));
 
-	if (!(log->flag & JFS_INLINELOG))
+	if (!test_bit(log_INLINELOG, &log->flag))
 		goto externalLog;
 	
 	/*
@@ -1445,7 +1439,7 @@ void lmLogWait(log_t *log)
  *			
  * serialization: single last close thread
  */
-static int lmLogShutdown(log_t * log)
+int lmLogShutdown(log_t * log)
 {
 	int rc;
 	lrd_t lrd;
@@ -1576,37 +1570,6 @@ static int lmLogFileSystem(log_t * log, char *uuid, int activate)
 	return rc;
 }
 
-
-/*
- *	lmLogQuiesce()
- */
-int lmLogQuiesce(log_t * log)
-{
-	int rc;
-
-	rc = lmLogShutdown(log);
-
-	return rc;
-}
-
-
-/*
- *	lmLogResume()
- */
-int lmLogResume(log_t * log, struct super_block *sb)
-{
-	struct jfs_sb_info *sbi = JFS_SBI(sb);
-	int rc;
-
-	log->base = addressPXD(&sbi->logpxd);
-	log->size =
-	    (lengthPXD(&sbi->logpxd) << sb->s_blocksize_bits) >> L2LOGPSIZE;
-	rc = lmLogInit(log);
-
-	return rc;
-}
-
-
 /*
  *		log buffer manager (lbm)
  *		------------------------
@@ -2190,42 +2153,40 @@ int jfsIOWait(void *arg)
 	return 0;
 }
 
-
-#ifdef _STILL_TO_PORT
 /*
  * NAME:	lmLogFormat()/jfs_logform()
  *
- * FUNCTION:	format file system log (ref. jfs_logform()).
+ * FUNCTION:	format file system log
  *
  * PARAMETERS:
- *	log	- log inode (with common mount inode base);
- *	logAddress - start address of log space in FS block;
+ *      log	- volume log
+ *	logAddress - start address of log space in FS block
  *	logSize	- length of log space in FS block;
  *
- * RETURN:	0 -	success
- *		-1 -	i/o error
+ * RETURN:	0	- success
+ *		-EIO	- i/o error
+ *
+ * XXX: We're synchronously writing one page at a time.  This needs to
+ *	be improved by writing multiple pages at once.
  */
-int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
+int lmLogFormat(log_t *log, s64 logAddress, int logSize)
 {
-	int rc = 0;
-	cbuf_t *bp;
+	int rc = -EIO;
+	struct jfs_sb_info *sbi = JFS_SBI(log->sb);
 	logsuper_t *logsuper;
 	logpage_t *lp;
 	int lspn;		/* log sequence page number */
 	struct lrd *lrd_ptr;
-	int npbperpage, npages;
+	int npages = 0;
+	lbuf_t *bp;
 
 	jFYI(0, ("lmLogFormat: logAddress:%Ld logSize:%d\n",
-		 logAddress, logSize));
+		 (long long)logAddress, logSize));
 
-	/* allocate a JFS buffer */
-	bp = rawAllocate();
+	/* allocate a log buffer */
+	bp = lbmAllocate(log, 1);
 
-	/* map the logical block address to physical block address */
-	bp->cm_blkno = logAddress << ipmnt->i_l2bfactor;
-
-	npbperpage = LOGPSIZE >> ipmnt->i_l2pbsize;
-	npages = logSize / (LOGPSIZE >> ipmnt->i_l2bsize);
+	npages = logSize >> sbi->l2nbperpage;
 
 	/*
 	 *      log space:
@@ -2239,20 +2200,22 @@ int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
 	/*
 	 *      init log superblock: log page 1
 	 */
-	logsuper = (logsuper_t *) bp->cm_cdata;
+	logsuper = (logsuper_t *) bp->l_ldata;
 
 	logsuper->magic = cpu_to_le32(LOGMAGIC);
 	logsuper->version = cpu_to_le32(LOGVERSION);
 	logsuper->state = cpu_to_le32(LOGREDONE);
-	logsuper->flag = cpu_to_le32(ipmnt->i_mntflag);	/* ? */
+	logsuper->flag = cpu_to_le32(sbi->mntflag);	/* ? */
 	logsuper->size = cpu_to_le32(npages);
-	logsuper->bsize = cpu_to_le32(ipmnt->i_bsize);
-	logsuper->l2bsize = cpu_to_le32(ipmnt->i_l2bsize);
-	logsuper->end =
-	    cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
+	logsuper->bsize = cpu_to_le32(sbi->bsize);
+	logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
+	logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
 
-	bp->cm_blkno += npbperpage;
-	rawWrite(ipmnt, bp, 0);
+	bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
+	bp->l_blkno = logAddress + sbi->nbperpage;
+	lbmStartIO(bp);
+	if ((rc = lbmIOWait(bp, 0)))
+		goto exit;
 
 	/*
 	 *      init pages 2 to npages-1 as log data pages:
@@ -2268,7 +2231,6 @@ int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
 	 * a circular file for the log records;
 	 * lpsn grows by 1 monotonically as each log page is written
 	 * to the circular file of the log;
-	 * Since the AIX DUMMY log record is dropped for this XJFS,
 	 * and setLogpage() will not reset the page number even if
 	 * the eor is equal to LOGPHDRSIZE. In order for binary search
 	 * still work in find log end process, we have to simulate the
@@ -2277,8 +2239,7 @@ int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
 	 * the succeeding log pages will have ascending order of
 	 * the lspn starting from 0, ... (N-2)
 	 */
-	lp = (logpage_t *) bp->cm_cdata;
-
+	lp = (logpage_t *) bp->l_ldata;
 	/*
 	 * initialize 1st log page to be written: lpsn = N - 1,
 	 * write a SYNCPT log record is written to this page
@@ -2293,8 +2254,11 @@ int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
 	lrd_ptr->length = 0;
 	lrd_ptr->log.syncpt.sync = 0;
 
-	bp->cm_blkno += npbperpage;
-	rawWrite(ipmnt, bp, 0);
+	bp->l_blkno += sbi->nbperpage;
+	bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
+	lbmStartIO(bp);
+	if ((rc = lbmIOWait(bp, 0)))
+		goto exit;
 
 	/*
 	 *      initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
@@ -2303,20 +2267,23 @@ int lmLogFormat(inode_t * ipmnt, s64 logAddress, int logSize)
 		lp->h.page = lp->t.page = cpu_to_le32(lspn);
 		lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
 
-		bp->cm_blkno += npbperpage;
-		rawWrite(ipmnt, bp, 0);
+		bp->l_blkno += sbi->nbperpage;
+		bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
+		lbmStartIO(bp);
+		if ((rc = lbmIOWait(bp, 0)))
+			goto exit;
 	}
 
+	rc = 0;
+exit:
 	/*
 	 *      finalize log
 	 */
 	/* release the buffer */
-	rawRelease(bp);
+	lbmFree(bp);
 
 	return rc;
 }
-#endif				/* _STILL_TO_PORT */
-
 
 #ifdef CONFIG_JFS_STATISTICS
 int jfs_lmstats_read(char *buffer, char **start, off_t offset, int length,

fs/jfs/jfs_logmgr.h

@@ -379,8 +379,7 @@ typedef struct jfs_log {
 	int size;		/* 4: log size in log page (in page) */
 	int l2bsize;		/* 4: log2 of bsize */
 
-	uint flag;		/* 4: flag */
-	uint state;		/* 4: state */
+	long flag;		/* 4: flag */
 
 	struct lbuf *lbuf_free;	/* 4: free lbufs */
 	wait_queue_head_t free_wait;	/* 4: */
@@ -396,7 +395,6 @@ typedef struct jfs_log {
 	/* syncpt */
 	int nextsync;		/* 4: bytes to write before next syncpt */
 	int active;		/* 4: */
-	int syncbarrier;	/* 4: */
 	wait_queue_head_t syncwait;	/* 4: */
 
 	/* commit */
@@ -420,6 +418,13 @@ typedef struct jfs_log {
 	char uuid[16];		/* 16: 128-bit uuid of log device */
 } log_t;
 
+/*
+ * Log flag
+ */
+#define log_INLINELOG	1
+#define log_SYNCBARRIER	2
+#define log_QUIESCE	3
+
 /*
  * group commit flag
  */
@@ -499,8 +504,8 @@ extern int lmLogOpen(struct super_block *sb, log_t ** log);
 extern void lmLogWait(log_t * log);
 extern int lmLogClose(struct super_block *sb, log_t * log);
 extern int lmLogSync(log_t * log, int nosyncwait);
-extern int lmLogQuiesce(log_t * log);
-extern int lmLogResume(log_t * log, struct super_block *sb);
-extern int lmLogFormat(struct super_block *sb, s64 logAddress, int logSize);
+extern int lmLogShutdown(log_t * log);
+extern int lmLogInit(log_t * log);
+extern int lmLogFormat(log_t *log, s64 logAddress, int logSize);
 
 #endif				/* _H_JFS_LOGMGR */

fs/jfs/jfs_mount.c

@@ -95,7 +95,7 @@ int jfs_mount(struct super_block *sb)
 		goto errout20;
 	}
 
-	ipaimap = diReadSpecial(sb, AGGREGATE_I);
+	ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
 	if (ipaimap == NULL) {
 		jERROR(1, ("jfs_mount: Faild to read AGGREGATE_I\n"));
 		rc = EIO;
@@ -118,7 +118,7 @@ int jfs_mount(struct super_block *sb)
 	/*
 	 * open aggregate block allocation map
 	 */
-	ipbmap = diReadSpecial(sb, BMAP_I);
+	ipbmap = diReadSpecial(sb, BMAP_I, 0);
 	if (ipbmap == NULL) {
 		rc = EIO;
 		goto errout22;
@@ -148,7 +148,7 @@ int jfs_mount(struct super_block *sb)
 	 * table.
 	 */
 	if ((sbi->mntflag & JFS_BAD_SAIT) == 0) {
-		ipaimap2 = diReadSpecial(sb, AGGREGATE_I + INOSPEREXT);
+		ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
 		if (ipaimap2 == 0) {
 			jERROR(1,
 			       ("jfs_mount: Faild to read AGGREGATE_I\n"));
@@ -178,7 +178,7 @@ int jfs_mount(struct super_block *sb)
 	/*
 	 * open fileset inode allocation map (aka fileset inode)
 	 */
-	ipimap = diReadSpecial(sb, FILESYSTEM_I);
+	ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
 	if (ipimap == NULL) {
 		jERROR(1, ("jfs_mount: Failed to read FILESYSTEM_I\n"));
 		/* open fileset secondary inode allocation map */
@@ -410,6 +410,7 @@ static int chkSuper(struct super_block *sb)
 		memcpy(sbi->uuid, j_sb->s_uuid, sizeof(sbi->uuid));
 		memcpy(sbi->loguuid, j_sb->s_loguuid, sizeof(sbi->uuid));
 	}
+	sbi->fsckpxd = j_sb->s_fsckpxd;
 	sbi->ait2 = j_sb->s_ait2;
 
       out:

fs/jfs/jfs_txnmgr.c

@@ -318,11 +318,12 @@ tid_t txBegin(struct super_block *sb, int flag)
 	TXN_LOCK();
 
       retry:
-	if (flag != COMMIT_FORCE) {
+	if (!(flag & COMMIT_FORCE)) {
 		/*
 		 * synchronize with logsync barrier
 		 */
-		if (log->syncbarrier) {
+		if (test_bit(log_SYNCBARRIER, &log->flag) ||
+		    test_bit(log_QUIESCE, &log->flag)) {
 			TXN_SLEEP(&log->syncwait);
 			goto retry;
 		}
@@ -330,8 +331,8 @@ tid_t txBegin(struct super_block *sb, int flag)
 	if (flag == 0) {
 		/*
 		 * Don't begin transaction if we're getting starved for tlocks
-		 * unless COMMIT_FORCE (imap changes) or COMMIT_INODE (which
-		 * may ultimately free tlocks)
+		 * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
+		 * free tlocks)
 		 */
 		if (TlocksLow) {
 			TXN_SLEEP(&TxAnchor.lowlockwait);
@@ -411,7 +412,8 @@ void txBeginAnon(struct super_block *sb)
 	/*
 	 * synchronize with logsync barrier
 	 */
-	if (log->syncbarrier) {
+	if (test_bit(log_SYNCBARRIER, &log->flag) ||
+	    test_bit(log_QUIESCE, &log->flag)) {
 		TXN_SLEEP(&log->syncwait);
 		goto retry;
 	}
@@ -490,14 +492,14 @@ void txEnd(tid_t tid)
 	/*
 	 * synchronize with logsync barrier
 	 */
-	if (log->syncbarrier && log->active == 0) {
+	if (test_bit(log_SYNCBARRIER, &log->flag) && log->active == 0) {
 		/* forward log syncpt */
 		/* lmSync(log); */
 
 		jFYI(1, ("     log barrier off: 0x%x\n", log->lsn));
 
 		/* enable new transactions start */
-		log->syncbarrier = 0;
+		clear_bit(log_SYNCBARRIER, &log->flag);
 
 		/* wakeup all waitors for logsync barrier */
 		TXN_WAKEUP(&log->syncwait);
@@ -823,36 +825,21 @@ static void txRelease(tblock_t * tblk)
  *
  * FUNCTION:    Initiates pageout of pages modified by tid in journalled
  *              objects and frees their lockwords.
- *
- * PARAMETER:
- *              flag    -
- *
- * RETURN:      Errors from subroutines.
  */
-static void txUnlock(tblock_t * tblk, int flag)
+static void txUnlock(tblock_t * tblk)
 {
 	tlock_t *tlck;
 	linelock_t *linelock;
 	lid_t lid, next, llid, k;
 	metapage_t *mp;
 	log_t *log;
-	int force;
 	int difft, diffp;
 
 	jFYI(1, ("txUnlock: tblk = 0x%p\n", tblk));
 	log = (log_t *) JFS_SBI(tblk->sb)->log;
-	force = flag & COMMIT_FLUSH;
-	if (log->syncbarrier)
-		force |= COMMIT_FORCE;
 
 	/*
 	 * mark page under tlock homeok (its log has been written):
-	 * if caller has specified FORCE (e.g., iRecycle()), or
-	 * if syncwait for the log is set (i.e., the log sync point
-	 * has fallen behind), or
-	 * if syncpt is set for the page, or
-	 * if the page is new, initiate pageout;
-	 * otherwise, leave the page in memory.
 	 */
 	for (lid = tblk->next; lid; lid = next) {
 		tlck = lid_to_tlock(lid);
@@ -1268,7 +1255,7 @@ int txCommit(tid_t tid,		/* transaction identifier */
 	txRelease(tblk);
 
 	if ((tblk->flag & tblkGC_LAZY) == 0)
-		txUnlock(tblk, flag);
+		txUnlock(tblk);
 
 
 	/*
@@ -2753,7 +2740,7 @@ void txLazyCommit(tblock_t * tblk)
 	spin_unlock_irq(&log->gclock);	// LOGGC_UNLOCK
 
 	if (tblk->flag & tblkGC_LAZY) {
-		txUnlock(tblk, 0);
+		txUnlock(tblk);
 		tblk->flag &= ~tblkGC_LAZY;
 		txEnd(tblk - TxBlock);	/* Convert back to tid */
 	}
@@ -2887,6 +2874,77 @@ static void LogSyncRelease(metapage_t * mp)
 	release_metapage(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 TlocksLow 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;
+	log_t *log = JFS_SBI(sb)->log;
+	int rc;
+	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);
+		down(&jfs_ip->commit_sem);
+		rc = txCommit(tid, 1, &ip, 0);
+		txEnd(tid);
+		up(&jfs_ip->commit_sem);
+		/*
+		 * Just to be safe.  I don't know how
+		 * long we can run without blocking
+		 */
+		cond_resched();
+		TXN_LOCK();
+	}
+
+	/*
+	 * If jfs_sync is running in parallel, there could be some inodes
+	 * on anon_list2.  Let's check.
+	 */
+	if (!list_empty(&TxAnchor.anon_list2)) {
+		list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list);
+		INIT_LIST_HEAD(&TxAnchor.anon_list2);
+		goto restart;
+	}
+	TXN_UNLOCK();
+}
+
+/*
+ * txResume()
+ *
+ * Allows transactions to start again following txQuiesce
+ */
+void txResume(struct super_block *sb)
+{
+	log_t *log = JFS_SBI(sb)->log;
+
+	clear_bit(log_QUIESCE, &log->flag);
+	TXN_WAKEUP(&log->syncwait);
+}
+
 /*
  *      jfs_sync(void)
  *
@@ -2938,7 +2996,8 @@ int jfs_sync(void)
 				 * when it is committed
 				 */
 				TXN_UNLOCK();
-				tid = txBegin(ip->i_sb, COMMIT_INODE);
+				tid = txBegin(ip->i_sb,
+					      COMMIT_INODE | COMMIT_FORCE);
 				rc = txCommit(tid, 1, &ip, 0);
 				txEnd(tid);
 				up(&jfs_ip->commit_sem);
@@ -2954,9 +3013,6 @@ int jfs_sync(void)
 				 * so let's not block here.  Save it to
 				 * put back on the anon_list.
 				 */
-				if (TxAnchor.anon_list.next !=
-				    &jfs_ip->anon_inode_list)
-					continue;
 
 				/* Take off anon_list */
 				list_del(&jfs_ip->anon_inode_list);

fs/jfs/jfs_txnmgr.h

@@ -310,4 +310,7 @@ extern void txFreelock(struct inode *ip);
 
 extern int lmLog(log_t * log, tblock_t * tblk, lrd_t * lrd, tlock_t * tlck);
 
+extern void txQuiesce(struct super_block *sb);
+
+extern void txResume(struct super_block *sb);
 #endif				/* _H_JFS_TXNMGR */

fs/jfs/jfs_xtree.c

@@ -2373,7 +2373,6 @@ printf("xtUpdate.updateLeft.split p:0x%p\n", p);
 }
 
 
-#ifdef _STILL_TO_PORT
 /*
  *      xtAppend()
  *
@@ -2392,7 +2391,7 @@ printf("xtUpdate.updateLeft.split p:0x%p\n", p);
  * return:
  */
 int xtAppend(tid_t tid,		/* transaction id */
-	     struct inode *ip, int xflag, s64 xoff, s32 maxblocks,	/* @GD1 */
+	     struct inode *ip, int xflag, s64 xoff, s32 maxblocks,	
 	     s32 * xlenp,	/* (in/out) */
 	     s64 * xaddrp,	/* (in/out) */
 	     int flag)
@@ -2460,7 +2459,7 @@ int xtAppend(tid_t tid,		/* transaction id */
 	pxdlist.maxnpxd = pxdlist.npxd = 0;
 	pxd = &pxdlist.pxd[0];
 	nblocks = JFS_SBI(ip->i_sb)->nbperpage;
-	for (; nsplit > 0; nsplit--, pxd++, xaddr += nblocks, maxblocks -= nblocks) {	/* @GD1 */
+	for (; nsplit > 0; nsplit--, pxd++, xaddr += nblocks, maxblocks -= nblocks) {	
 		if ((rc = dbAllocBottomUp(ip, xaddr, (s64) nblocks)) == 0) {
 			PXDaddress(pxd, xaddr);
 			PXDlength(pxd, nblocks);
@@ -2475,7 +2474,7 @@ int xtAppend(tid_t tid,		/* transaction id */
 		goto out;
 	}
 
-	xlen = min(xlen, maxblocks);	/* @GD1 */
+	xlen = min(xlen, maxblocks);	
 
 	/*
 	 * allocate data extent requested
@@ -2528,7 +2527,7 @@ int xtAppend(tid_t tid,		/* transaction id */
 	    cpu_to_le16(le16_to_cpu(p->header.nextindex) + 1);
 
 	xtlck->lwm.offset =
-	    (xtlck->lwm.offset) ? min(index, xtlck->lwm.offset) : index;
+	    (xtlck->lwm.offset) ? min(index,(int) xtlck->lwm.offset) : index;
 	xtlck->lwm.length = le16_to_cpu(p->header.nextindex) -
 	    xtlck->lwm.offset;
 
@@ -2541,7 +2540,7 @@ int xtAppend(tid_t tid,		/* transaction id */
 
 	return rc;
 }
-
+#ifdef _STILL_TO_PORT
 
 /* - TBD for defragmentaion/reorganization -
  *

fs/jfs/super.c

@@ -71,8 +71,9 @@ extern void jfs_delete_inode(struct inode *inode);
 extern void jfs_write_inode(struct inode *inode, int wait);
 
 extern struct dentry *jfs_get_parent(struct dentry *dentry);
+extern int jfs_extendfs(struct super_block *, s64, int);
 
-#ifdef PROC_FS_JFS /* see jfs_debug.h */
+#ifdef PROC_FS_JFS		/* see jfs_debug.h */
 extern void jfs_proc_init(void);
 extern void jfs_proc_clean(void);
 #endif
@@ -119,7 +120,7 @@ static int jfs_statfs(struct super_block *sb, struct statfs *buf)
 	 */
 	maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 			((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
-			 << L2INOSPEREXT), (s64)0xffffffffLL);
+			 << L2INOSPEREXT), (s64) 0xffffffffLL);
 	buf->f_files = maxinodes;
 	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 				    atomic_read(&imap->im_numfree));
@@ -156,20 +157,23 @@ static void jfs_put_super(struct super_block *sb)
 	kfree(sbi);
 }
 
-static int parse_options (char * options, struct jfs_sb_info *sbi)
+static int parse_options(char *options, struct super_block *sb, s64 *newLVSize)
 {
 	void *nls_map = NULL;
-	char * this_char;
-	char * value;
+	char *this_char;
+	char *value;
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+
+	*newLVSize = 0;
 
 	if (!options)
 		return 1;
-	while ((this_char = strsep (&options, ",")) != NULL) {
+	while ((this_char = strsep(&options, ",")) != NULL) {
 		if (!*this_char)
 			continue;
-		if ((value = strchr (this_char, '=')) != NULL)
+		if ((value = strchr(this_char, '=')) != NULL)
 			*value++ = 0;
-		if (!strcmp (this_char, "iocharset")) {
+		if (!strcmp(this_char, "iocharset")) {
 			if (!value || !*value)
 				goto needs_arg;
 			if (nls_map)	/* specified iocharset twice! */
@@ -179,14 +183,25 @@ static int parse_options (char * options, struct jfs_sb_info *sbi)
 				printk(KERN_ERR "JFS: charset not found\n");
 				goto cleanup;
 			}
-		/* Silently ignore the quota options */
-		} else if (!strcmp (this_char, "grpquota")
-		         || !strcmp (this_char, "noquota")
-		         || !strcmp (this_char, "quota")
-		         || !strcmp (this_char, "usrquota"))
+		} else if (!strcmp(this_char, "resize")) {
+			if (!value || !*value) {
+				*newLVSize = sb->s_bdev->bd_inode->i_size >>
+					sb->s_blocksize_bits;
+				if (*newLVSize == 0)
+					printk(KERN_ERR
+					 "JFS: Cannot determine volume size\n");
+			} else
+				*newLVSize = simple_strtoull(value, &value, 0);
+
+			/* Silently ignore the quota options */
+		} else if (!strcmp(this_char, "grpquota")
+			   || !strcmp(this_char, "noquota")
+			   || !strcmp(this_char, "quota")
+			   || !strcmp(this_char, "usrquota"))
 			/* Don't do anything ;-) */ ;
 		else {
-			printk ("jfs: Unrecognized mount option %s\n", this_char);
+			printk("jfs: Unrecognized mount option %s\n",
+			       this_char);
 			goto cleanup;
 		}
 	}
@@ -208,10 +223,22 @@ static int parse_options (char * options, struct jfs_sb_info *sbi)
 int jfs_remount(struct super_block *sb, int *flags, char *data)
 {
 	struct jfs_sb_info *sbi = JFS_SBI(sb);
+	s64 newLVSize = 0;
+	int rc = 0;
 
-	if (!parse_options(data, sbi)) {
+	if (!parse_options(data, sb, &newLVSize)) {
 		return -EINVAL;
 	}
+	if (newLVSize) {
+		if (sb->s_flags & MS_RDONLY) {
+			printk(KERN_ERR
+		  "JFS: resize requires volume to be mounted read-write\n");
+			return -EROFS;
+		}
+		rc = jfs_extendfs(sb, newLVSize, 0);
+		if (rc)
+			return rc;
+	}
 
 	if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 		/*
@@ -232,20 +259,26 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	struct jfs_sb_info *sbi;
 	struct inode *inode;
 	int rc;
+	s64 newLVSize = 0;
 
 	jFYI(1, ("In jfs_read_super: s_flags=0x%lx\n", sb->s_flags));
 
-	sbi = kmalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
+	sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 	if (!sbi)
 		return -ENOSPC;
-	memset(sbi, 0, sizeof(struct jfs_sb_info));
+	memset(sbi, 0, sizeof (struct jfs_sb_info));
 	sb->u.generic_sbp = sbi;
 
-	if (!parse_options((char *)data, sbi)) {
+	if (!parse_options((char *) data, sb, &newLVSize)) {
 		kfree(sbi);
 		return -EINVAL;
 	}
 
+	if (newLVSize) {
+		printk(KERN_ERR "resize option for remount only\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Initialize blocksize to 4K.
 	 */
@@ -276,8 +309,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	if (rc) {
 		if (!silent) {
 			jERROR(1,
-			       ("jfs_mount failed w/return code = %d\n",
-				rc));
+			       ("jfs_mount failed w/return code = %d\n", rc));
 		}
 		goto out_mount_failed;
 	}
@@ -314,7 +346,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 	 * Page cache is indexed by long.
 	 * I would use MAX_LFS_FILESIZE, but it's only half as big
 	 */
-	sb->s_maxbytes = min(((u64)PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
+	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 #endif
 
 	return 0;
@@ -379,16 +411,17 @@ extern int txInit(void);
 extern void txExit(void);
 extern void metapage_exit(void);
 
-static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 {
 	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 
-	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 	    SLAB_CTOR_CONSTRUCTOR) {
 		INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 		INIT_LIST_HEAD(&jfs_ip->mp_list);
 		init_rwsem(&jfs_ip->rdwrlock);
 		init_MUTEX(&jfs_ip->commit_sem);
+		jfs_ip->atlhead = 0;
 		inode_init_once(&jfs_ip->vfs_inode);
 	}
 }
@@ -398,9 +431,8 @@ static int __init init_jfs_fs(void)
 	int rc;
 
 	jfs_inode_cachep =
-	    kmem_cache_create("jfs_ip",
-			    sizeof(struct jfs_inode_info),
-			    0, 0, init_once, NULL);
+	    kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 0,
+			      init_once, NULL);
 	if (jfs_inode_cachep == NULL)
 		return -ENOMEM;
 
@@ -426,37 +458,32 @@ static int __init init_jfs_fs(void)
 	 * I/O completion thread (endio)
 	 */
 	jfsIOthread = kernel_thread(jfsIOWait, 0,
-				    CLONE_FS | CLONE_FILES |
-				    CLONE_SIGHAND);
+				    CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 	if (jfsIOthread < 0) {
 		jERROR(1,
-		       ("init_jfs_fs: fork failed w/rc = %d\n",
-			jfsIOthread));
+		       ("init_jfs_fs: fork failed w/rc = %d\n", jfsIOthread));
 		goto end_txmngr;
 	}
-	wait_for_completion(&jfsIOwait);	/* Wait until IO thread starts */
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
 
 	jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
-					CLONE_FS | CLONE_FILES |
-					CLONE_SIGHAND);
+					CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 	if (jfsCommitThread < 0) {
 		jERROR(1,
 		       ("init_jfs_fs: fork failed w/rc = %d\n",
 			jfsCommitThread));
 		goto kill_iotask;
 	}
-	wait_for_completion(&jfsIOwait);	/* Wait until IO thread starts */
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
 
 	jfsSyncThread = kernel_thread(jfs_sync, 0,
-				      CLONE_FS | CLONE_FILES |
-				      CLONE_SIGHAND);
+				      CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 	if (jfsSyncThread < 0) {
 		jERROR(1,
-		       ("init_jfs_fs: fork failed w/rc = %d\n",
-			jfsSyncThread));
+		       ("init_jfs_fs: fork failed w/rc = %d\n", jfsSyncThread));
 		goto kill_committask;
 	}
-	wait_for_completion(&jfsIOwait);	/* Wait until IO thread starts */
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
 
 #ifdef PROC_FS_JFS
 	jfs_proc_init();
@@ -464,15 +491,14 @@ static int __init init_jfs_fs(void)
 
 	return register_filesystem(&jfs_fs_type);
 
-
 kill_committask:
 	jfs_stop_threads = 1;
 	wake_up(&jfs_commit_thread_wait);
-	wait_for_completion(&jfsIOwait);	/* Wait until Commit thread exits */
+	wait_for_completion(&jfsIOwait);	/* Wait for thread exit */
 kill_iotask:
 	jfs_stop_threads = 1;
 	wake_up(&jfs_IO_thread_wait);
-	wait_for_completion(&jfsIOwait);	/* Wait until IO thread exits */
+	wait_for_completion(&jfsIOwait);	/* Wait for thread exit */
 end_txmngr:
 	txExit();
 free_metapage: