shithub: gefs

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fs: zero new data block outside write range

Otherwise, we write garbage to the parts of the file not explicitly
written.

--- a/fs.c

+++ b/fs.c

@@ -301,6 +301,7 @@

 	b = newblk(Traw);

 	if(b == nil)

 		return -1;

+	t = nil;

 	if(fb < sz && (fo != 0 || n != Blksz)){

 		if(lookup(f, m, &kv, buf, sizeof(buf), 0) != nil)

 			return -1;

@@ -314,6 +315,12 @@

 	if(fo+n > Blksz)

 		n = Blksz-fo;

 	memcpy(b->buf+fo, s, n);

+	if(t == nil){

+		if(fo > 0)

+			memset(b->buf, 0, fo);

+		if(fo+n < Blksz)

+			memset(b->buf+fo+n, 0, Blksz-fo-n);

+	}

 	enqueue(b);

 	packbp(m->v, m->nv, &b->bp);