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Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom |
Date: |
Thu, 02 Jul 2015 16:18:30 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 02/07/2015 16:03, Paolo Bonzini wrote:
>
>
> On 02/07/2015 15:58, Laurent Vivier wrote:
>> Since any /dev entry can be treated as a raw disk image, it is worth
>> noting which devices can be accessed when and how. /dev/rdisk nodes are
>> character-special devices, but are "raw" in the BSD sense and force
>> block-aligned I/O. They are closer to the physical disk than the buffer
>> cache. /dev/disk nodes, on the other hand, are buffered block-special
>> devices and are used primarily by the kernel's filesystem code.
>
> So the right thing to do would not be just to set need_alignment, but to
> probe it like we do on Linux for BDRV_O_NO_CACHE.
>
> I'm okay with doing the simple thing, but it needs a comment for non-BSDers.
So, what we have to do, in our case, for MacOS X cdrom, is something like:
... GetBSDPath ...
...
if (flags & BDRV_O_NOCACHE) {
strcat(bsdPath, "r");
}
...
?
Laurent
- [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Programmingkid, 2015/07/01
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, M A, 2015/07/01
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Paolo Bonzini, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Stefan Hajnoczi, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Laurent Vivier, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Paolo Bonzini, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Laurent Vivier, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Paolo Bonzini, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom,
Laurent Vivier <=
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Paolo Bonzini, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Laurent Vivier, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Programmingkid, 2015/07/02
- Re: [Qemu-devel] [PATCH v2] raw-posix.c: remove raw device access for cdrom, Programmingkid, 2015/07/02
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Kevin Wolf, 2015/07/08
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Laurent Vivier, 2015/07/08
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Kevin Wolf, 2015/07/08
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Programmingkid, 2015/07/08
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Kevin Wolf, 2015/07/08
- Re: [Qemu-devel] [PATCH] raw-posix.c: remove raw device access for cdrom, Programmingkid, 2015/07/08