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more hjfs fixes

--- a/sys/src/cmd/hjfs/cons.c

+++ b/sys/src/cmd/hjfs/cons.c

@@ -21,8 +21,7 @@

 walkpath(Chan *ch, char *path, char **cr)

 {

 	char buf[NAMELEN], *p, *fp;

-	

-	buf[NAMELEN - 1] = 0;

+

 	fp = path;

 	if(*path != '/'){

 	noent:

@@ -51,6 +50,7 @@

 			break;

 		if(p - path >= NAMELEN)

 			goto noent;

+		memset(buf, 0, sizeof buf);

 		memcpy(buf, path, p - path);

 		if(chanwalk(ch, buf) <= 0){

 			werrstr("%s: %r", fp);

--- a/sys/src/cmd/hjfs/dump.c

+++ b/sys/src/cmd/hjfs/dump.c

@@ -115,6 +115,8 @@

 		runlock(fs);

 		wlock(fs);

 	}

+	if(l->next != nil && willmodify(fs, l->next, 1) < 0)

+		goto err;

 	rc = chref(fs, l->blk, 0);

 	if(rc < 0)

 		goto err;

@@ -125,8 +127,7 @@

 	}

 	if(rc == 1)

 		goto done;

-	if(willmodify(fs, l->next, 1) < 0)

-		goto err;

+

 	p = getbuf(fs->d, l->next->blk, TDENTRY, 0);

 	if(p == nil)

 		goto err;

--- a/sys/src/cmd/hjfs/fs1.c

+++ b/sys/src/cmd/hjfs/fs1.c

@@ -387,7 +387,10 @@

 	Buf *b;

 	qlock(&fs->loctree);

+	if(!loop && --l->ref <= 0)

+		goto freeit;

 	while(loop && l != nil && l->ref <= 1){

+freeit:

 		if((l->flags & LGONE) != 0){

 			b = getbuf(fs->d, l->blk, TDENTRY, 0);

 			if(b != nil){

@@ -558,12 +561,14 @@

 				return -1;

 			memset(b->offs, 0, sizeof(b->offs));

 		}else{

-			if(mode != GBREAD && chref(fs, *loc, 0) > 1)

+			if(mode != GBREAD && chref(fs, *loc, 0) > 1){

 				if(dumpblk(fs, L, loc) < 0){

 					if(b != bd)

 						putbuf(b);

 					return -1;

 				}

+				b->op |= BDELWRI;

+			}

 			k = *loc;

 			if(b != bd)

 				putbuf(b);

-- 

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