From: Nikolaus Rath <Nikolaus@rath.org>
Date: Fri, 7 Apr 2017 23:27:59 +0000 (-0700)
Subject: passthrough:truncate(): work on file descriptor when possible
X-Git-Tag: fuse-3.0.1~9
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=76218eb4614146b52f59563e85e6b5971acbfe92;p=qemu-gpiodev%2Flibfuse.git

passthrough:truncate(): work on file descriptor when possible

This allows truncating an open file even if write permission
was removed after open() (which is the expected behavior).
---

diff --git a/example/passthrough.c b/example/passthrough.c
index 55f7704..67663ab 100644
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -250,10 +250,12 @@ static int xmp_chown(const char *path, uid_t uid, gid_t gid,
 static int xmp_truncate(const char *path, off_t size,
 			struct fuse_file_info *fi)
 {
-	(void) fi;
 	int res;
 
-	res = truncate(path, size);
+	if (fi != NULL)
+		res = ftruncate(fi->fh, size);
+	else
+		res = truncate(path, size);
 	if (res == -1)
 		return -errno;