shithub: gefs

Download patch

ref: 73c79144626a3f34a719f920845de2982cf52ce0
parent: 413a40efbd10773e06efd6833efea42c920f7d2d
author: Michael Forney <mforney@mforney.org>
date: Mon Feb 14 07:32:16 EST 2022

fs: take reference to tree before lookup
Otherwise, the tree may get replaced after we look at the current
mount root, and the old tree destroyed while we are in btlookup.

--- a/fs.c

+++ b/fs.c

@@ -208,10 +208,12 @@

 		rlock(f->dent);

 	lock(f->mnt);

 	r = f->mnt->root;

+	ainc(&r->memref);

 	unlock(f->mnt);

 	e = btlookup(r, k, kv, buf, nbuf);

 	if(lk)

 		runlock(f->dent);

+	closesnap(r);

 	return e;

 }