Implement lseek operation (#457)

3 files changed, 50 insertions, 0 deletions

diff --git a/example/passthrough.c b/example/passthrough.c
index 6de9fc1..012bd31 100644
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -484,6 +484,28 @@ static ssize_t xmp_copy_file_range(const char *path_in,
 }
 #endif
 
+static off_t xmp_lseek(const char *path, off_t off, int whence, struct fuse_file_info *fi)
+{
+	int fd;
+	off_t res;
+
+	if (fi == NULL)
+		fd = open(path, O_RDONLY);
+	else
+		fd = fi->fh;
+
+	if (fd == -1)
+		return -errno;
+
+	res = lseek(fd, off, whence);
+	if (res == -1)
+		res = -errno;
+
+	if (fi == NULL)
+		close(fd);
+	return res;
+}
+
 static struct fuse_operations xmp_oper = {
 	.init           = xmp_init,
 	.getattr	= xmp_getattr,
@@ -522,6 +544,7 @@ static struct fuse_operations xmp_oper = {
 #ifdef HAVE_COPY_FILE_RANGE
 	.copy_file_range = xmp_copy_file_range,
 #endif
+	.lseek		= xmp_lseek,
 };
 
 int main(int argc, char *argv[])
diff --git a/example/passthrough_fh.c b/example/passthrough_fh.c
index 3fc80f8..13eb41e 100644
--- a/example/passthrough_fh.c
+++ b/example/passthrough_fh.c
@@ -596,6 +596,18 @@ static ssize_t xmp_copy_file_range(const char *path_in,
 }
 #endif
 
+static off_t xmp_lseek(const char *path, off_t off, int whence, struct fuse_file_info *fi)
+{
+	off_t res;
+	(void) path;
+
+	res = lseek(fi->fh, off, whence);
+	if (res == -1)
+		return -errno;
+
+	return res;
+}
+
 static struct fuse_operations xmp_oper = {
 	.init           = xmp_init,
 	.getattr	= xmp_getattr,
@@ -643,6 +655,7 @@ static struct fuse_operations xmp_oper = {
 #ifdef HAVE_COPY_FILE_RANGE
 	.copy_file_range = xmp_copy_file_range,
 #endif
+	.lseek		= xmp_lseek,
 };
 
 int main(int argc, char *argv[])
diff --git a/example/passthrough_ll.c b/example/passthrough_ll.c
index 0f1fda5..5372d02 100644
--- a/example/passthrough_ll.c
+++ b/example/passthrough_ll.c
@@ -1161,6 +1161,19 @@ static void lo_copy_file_range(fuse_req_t req, fuse_ino_t ino_in, off_t off_in,
 }
 #endif
 
+static void lo_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence,
+		     struct fuse_file_info *fi)
+{
+	off_t res;
+
+	(void)ino;
+	res = lseek(fi->fh, off, whence);
+	if (res != -1)
+		fuse_reply_lseek(req, res);
+	else
+		fuse_reply_err(req, errno);
+}
+
 static struct fuse_lowlevel_ops lo_oper = {
 	.init		= lo_init,
 	.lookup		= lo_lookup,
@@ -1198,6 +1211,7 @@ static struct fuse_lowlevel_ops lo_oper = {
 #ifdef HAVE_COPY_FILE_RANGE
 	.copy_file_range = lo_copy_file_range,
 #endif
+	.lseek		= lo_lseek,
 };
 
 int main(int argc, char *argv[])