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[Qemu-devel] [PATCH v7] block/raw-posix.c: Fixes raw_getlength() on Mac
From: |
Programmingkid |
Subject: |
[Qemu-devel] [PATCH v7] block/raw-posix.c: Fixes raw_getlength() on Mac OS X so that it reports the correct length of a real CD |
Date: |
Thu, 15 Jan 2015 18:40:03 -0500 |
This patch allows Mac OS X to use a real CDROM disc in QEMU. Testing this patch
will require using QEMU v2.2.0 because the current git version has a bug in it
that prevents /dev/cdrom from being used. "make check" did pass and my Debian
boot disc did work.
Signed-off-by: John Arbuckle <address@hidden>
---
Totally rewritten.
block/raw-posix.c | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index e51293a..a95cfcf 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1312,7 +1312,20 @@ again:
if (size == 0)
#endif
#if defined(__APPLE__) && defined(__MACH__)
- size = LLONG_MAX;
+ {
+ uint64_t sectors = 0;
+ uint32_t sector_size = 0;
+
+ if (ioctl(fd, DKIOCGETBLOCKCOUNT, §ors) == 0
+ && ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) == 0) {
+ size = sectors * sector_size;
+ } else {
+ size = lseek(fd, 0LL, SEEK_END);
+ if (size < 0) {
+ return -errno;
+ }
+ }
+ }
#else
size = lseek(fd, 0LL, SEEK_END);
if (size < 0) {
--
1.7.5.4