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[Qemu-devel] [PATCH] Error on O_DIRECT for physical CDROM/DVD drives
From: |
Jes . Sorensen |
Subject: |
[Qemu-devel] [PATCH] Error on O_DIRECT for physical CDROM/DVD drives |
Date: |
Tue, 20 Jul 2010 18:09:37 +0200 |
From: Jes Sorensen <address@hidden>
O_DIRECT (cache=none) requires sector alignment, however the physical
sector size of CDROM/DVD drives is 2048, as opposed to most disk
devices which use 512. QEMU is hard coding 512 all over the place, so
allowing O_DIRECT for CDROM/DVD devices does not work. Exit with an
error!
Signed-off-by: Jes Sorensen <address@hidden>
---
block/raw-posix.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 291699f..1b840c4 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1139,6 +1139,11 @@ static int cdrom_open(BlockDriverState *bs, const char
*filename, int flags)
BDRVRawState *s = bs->opaque;
s->type = FTYPE_CD;
+ if (flags & BDRV_O_NOCACHE) {
+ fprintf(stderr, "O_DIRECT (cache=none) for CDROM/DVD device (%s) "
+ "is unsupported\n", filename);
+ exit(1);
+ }
/* open will not fail even if no CD is inserted, so add O_NONBLOCK */
return raw_open_common(bs, filename, flags, O_NONBLOCK);
--
1.7.1.1
- [Qemu-devel] [PATCH] Error on O_DIRECT for physical CDROM/DVD drives,
Jes . Sorensen <=