[Qemu-devel] [PATCH] block/raw-posix: use a character device if a block device is given

[Christoph Egger <Christoph.Egger@amd.com>]

if given a block device, use the character device instead.

From: Manuel Bouyer <bouyer@NetBSD.org>
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

diff --git a/block/raw-posix.c b/block/raw-posix.c
index 6b72470..d05f373 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -136,11 +143,45 @@ static int64_t raw_getlength(BlockDriverState *bs);
  static int cdrom_reopen(BlockDriverState *bs);
  #endif

+#if defined(__NetBSD__)
+static const char *raw_get_rawdevice(const char *filename)
+{
+    static char namebuf[PATH_MAX];
+    const char *dp = strrchr(filename, '/');
+
+    if (dp == NULL) {
+        snprintf(namebuf, PATH_MAX, "r%s", filename);
+    } else {
+        snprintf(namebuf, PATH_MAX, "%.*s/r%s",
+            (int)(dp - filename), filename, dp + 1);
+    }
+    fprintf(stderr, "%s is a block device", filename);
+    filename = namebuf;
+    fprintf(stderr, ", using %s\n", filename);
+
+    return filename;
+}
+#else
+static const char *raw_get_rawdevice(const char *filename)
+{
+    return filename;
+}
+#endif
+
  static int raw_open_common(BlockDriverState *bs, const char *filename,
                             int bdrv_flags, int open_flags)
  {
      BDRVRawState *s = bs->opaque;
      int fd, ret;
+    struct stat sb;
+
+    if (lstat(filename, &sb) < 0) {
+        fprintf(stderr, "%s: stat failed: %s\n", filename, 
strerror(errno));
+        return -errno;
+    }
+
+    if (S_ISBLK(sb.st_mode))
+        filename = raw_get_rawdevice(filename);

      s->open_flags = open_flags | O_BINARY;
      s->open_flags &= ~O_ACCMODE;


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