[Qemu-devel] [PATCH 4/5] block/raw-posix: Strip protocol prefix on creation

[Max Reitz <mreitz@redhat.com>]

The hdev_create() implementation in block/raw-posix.c is used by the
"host_device", "host_cdrom" and "host_floppy" protocol block drivers
together. Thus, it any of the associated prefixes may occur and exactly
one should be stripped, if it does (thus,
"host_device:host_cdrom:/dev/cdrom" is not shortened to "/dev/cdrom").

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/raw-posix.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index 6c9b8f2..598d736 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1776,6 +1776,18 @@ static int hdev_create(const char *filename, QEMUOptionParameter *options,
     int ret = 0;
     struct stat stat_buf;
     int64_t total_size = 0;
+    bool has_prefix;
+
+    /* This function is used by all three protocol block drivers and therefore
+     * any of these three prefixes may be given.
+     * The return value has to be stored somewhere, otherwise this is an error
+     * due to -Werror=unused-value. */
+    has_prefix =
+        strstart(filename, "host_device:", &filename) ||
+        strstart(filename, "host_cdrom:" , &filename) ||
+        strstart(filename, "host_floppy:", &filename);
+
+    (void)has_prefix;
 
     /* Read out options */
     while (options && options->name) {
-- 
1.9.0