hjfs create patch

[Alex Musolino <musolinoa@gmail.com>]

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Hi all,

According to open(5), when creating a new file, the owner of the file
is the implied user id of the request, the group of the file is the
same as the parent directory.  Hjfs currently does not adhere to the
the latter part; the group of the file ends up being set the same as
the user id.

I've attached a patch to remedy this.  Subjected to light testing it
seems to work.  Perhaps there's a better way, though.

--
Cheers,
Alex Musolino

[-- Attachment #2: hjfs.patch --]
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diff -r df2c352ae695 sys/src/cmd/hjfs/fs2.c
--- a/sys/src/cmd/hjfs/fs2.c	Mon May 01 22:50:16 2017 +0200
+++ b/sys/src/cmd/hjfs/fs2.c	Fri Jun 16 21:58:49 2017 +1000
@@ -100,6 +100,22 @@
 	return p - name < NAMELEN;
 }
 
+static short
+getgid(Dev *d, Loc *l)
+{
+	Buf *b;
+	Dentry *e;
+
+	b = getbuf(d, l->blk, TDENTRY, 0);
+	if(b == nil)
+		return -1;
+	e = getdent(l, b);
+	putbuf(b);
+	if(e == nil)
+		return -1;
+	return e->gid;
+}
+
 int
 chancreat(Chan *ch, char *name, int perm, int mode)
 {
@@ -164,7 +180,8 @@
 	strcpy(d->name, name);
 	d->mtime = time(0);
 	d->atime = d->mtime;
-	d->gid = d->uid = d->muid = ch->uid;
+	d->gid = getgid(ch->fs->d, l->next);
+	d->uid = d->muid = ch->uid;
 	d->mode = DALLOC | perm & 0777;
 	if((d->type & QTEXCL) != 0){
 		qlock(&ch->loc->ex);