From: Nikolaus Rath <Nikolaus@rath.org>
Date: Thu, 6 Apr 2017 18:47:06 +0000 (-0700)
Subject: passthrough, passthrough_fh: disable attribute caching
X-Git-Tag: fuse-3.0.1~11
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f7c5d10ce529d1e131113e155e3321d1fda1ebc2;p=qemu-gpiodev%2Flibfuse.git

passthrough, passthrough_fh: disable attribute caching

Required for better hardlink handling, see comments in patch.
---

diff --git a/example/passthrough.c b/example/passthrough.c
index 15f424a..22e7083 100644
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -52,6 +52,18 @@ static void *xmp_init(struct fuse_conn_info *conn,
 {
 	(void) conn;
 	cfg->use_ino = 1;
+
+	/* Pick up changes from lower filesystem right away. This is
+	   also necessary for better hardlink support. When the kernel
+	   calls the unlink() handler, it does not know the inode of
+	   the to-be-removed entry and can therefore not invalidate
+	   the cache of the associated inode - resulting in an
+	   incorrect st_nlink value being reported for any remaining
+	   hardlinks to this inode. */
+	cfg->entry_timeout = 0;
+	cfg->attr_timeout = 0;
+	cfg->negative_timeout = 0;
+
 	return NULL;
 }
 
diff --git a/example/passthrough_fh.c b/example/passthrough_fh.c
index c807d75..372282e 100644
--- a/example/passthrough_fh.c
+++ b/example/passthrough_fh.c
@@ -57,6 +57,18 @@ static void *xmp_init(struct fuse_conn_info *conn,
 	(void) conn;
 	cfg->use_ino = 1;
 	cfg->nullpath_ok = 1;
+
+	/* Pick up changes from lower filesystem right away. This is
+	   also necessary for better hardlink support. When the kernel
+	   calls the unlink() handler, it does not know the inode of
+	   the to-be-removed entry and can therefore not invalidate
+	   the cache of the associated inode - resulting in an
+	   incorrect st_nlink value being reported for any remaining
+	   hardlinks to this inode. */
+	cfg->entry_timeout = 0;
+	cfg->attr_timeout = 0;
+	cfg->negative_timeout = 0;
+
 	return NULL;
 }