From: Nikolaus Rath <Nikolaus@rath.org>
Date: Mon, 5 Jun 2017 10:57:36 +0000 (-0400)
Subject: example/passthrough_ll: added write support
X-Git-Tag: fuse-3.1.0~17
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bb3770f38a01f4032a717b4a07087a166482d0fe;p=qemu-gpiodev%2Flibfuse.git

example/passthrough_ll: added write support
---

diff --git a/ChangeLog.rst b/ChangeLog.rst
index 560ad98..ca166f9 100644
--- a/ChangeLog.rst
+++ b/ChangeLog.rst
@@ -1,6 +1,8 @@
 Unreleased Changes
 ==================
 
+* The `example/passthrough_ll` filesystem now supports writing
+  to files.
 * `fuse_main()` / `fuse_remove_signal_handlers()`: do not reset
   `SIGPIPE` handler to `SIG_DFL` it was not set by us.
 * Documented the `RENAME_EXCHANGE` and `RENAME_NOREPLACE` flags that
diff --git a/example/passthrough_ll.c b/example/passthrough_ll.c
index 772a822..dd3166a 100644
--- a/example/passthrough_ll.c
+++ b/example/passthrough_ll.c
@@ -453,7 +453,7 @@ static void lo_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi
 }
 
 static void lo_read(fuse_req_t req, fuse_ino_t ino, size_t size,
-			  off_t offset, struct fuse_file_info *fi)
+		    off_t offset, struct fuse_file_info *fi)
 {
 	struct fuse_bufvec buf = FUSE_BUFVEC_INIT(size);
 
@@ -466,6 +466,25 @@ static void lo_read(fuse_req_t req, fuse_ino_t ino, size_t size,
 	fuse_reply_data(req, &buf, FUSE_BUF_SPLICE_MOVE);
 }
 
+static void lo_write_buf(fuse_req_t req, fuse_ino_t ino,
+			 struct fuse_bufvec *in_buf, off_t off,
+			 struct fuse_file_info *fi)
+{
+	(void) ino;
+	ssize_t res;
+	struct fuse_bufvec out_buf = FUSE_BUFVEC_INIT(fuse_buf_size(in_buf));
+
+	out_buf.buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
+	out_buf.buf[0].fd = fi->fh;
+	out_buf.buf[0].pos = off;
+
+	res = fuse_buf_copy(&out_buf, in_buf, 0);
+	if(res < 0)
+		fuse_reply_err(req, -res);
+	else
+		fuse_reply_write(req, (size_t) res);
+}
+
 static struct fuse_lowlevel_ops lo_oper = {
 	.init		= lo_init,
 	.lookup		= lo_lookup,
@@ -479,6 +498,7 @@ static struct fuse_lowlevel_ops lo_oper = {
 	.open		= lo_open,
 	.release	= lo_release,
 	.read		= lo_read,
+	.write_buf      = lo_write_buf
 };
 
 int main(int argc, char *argv[])
diff --git a/test/test_examples.py b/test/test_examples.py
index 953eeec..401f074 100755
--- a/test/test_examples.py
+++ b/test/test_examples.py
@@ -86,11 +86,11 @@ def test_passthrough(tmpdir, name, debug, capfd):
         tst_statvfs(work_dir)
         tst_readdir(src_dir, work_dir)
         tst_open_read(src_dir, work_dir)
+        tst_open_write(src_dir, work_dir)
         if not is_ll:
             tst_mkdir(work_dir)
             tst_rmdir(src_dir, work_dir)
             tst_create(work_dir)
-            tst_open_write(src_dir, work_dir)
             tst_unlink(src_dir, work_dir)
             tst_symlink(work_dir)
             if os.getuid() == 0: