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Re: [Qemu-devel] [PATCH for-2.10 07/16] block/file-posix: Generalize raw
Re: [Qemu-devel] [PATCH for-2.10 07/16] block/file-posix: Generalize raw_regular_truncate
Wed, 22 Mar 2017 17:53:00 +0100
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On 22.03.2017 17:44, Stefan Hajnoczi wrote:
> On Mon, Mar 20, 2017 at 04:11:24PM +0100, Max Reitz wrote:
>> On 20.03.2017 12:00, Stefan Hajnoczi wrote:
>>> On Mon, Mar 13, 2017 at 10:40:36PM +0100, Max Reitz wrote:
>>>> +static int raw_regular_truncate(int fd, BlockDriverState *bs, int64_t
>>> The presence of both a file descriptor and a BlockDriverState (actually
>>> it must be a BDRVRawState) arguments is unusual. It seems bs is needed
>>> for bdrv_getlength().
>>> How about using fstat(fd, &st) and then dropping bs and create?
>> Well, I could do that, but bdrv_getlength() is a bit simpler and I don't
>> see much of an issue with specifying both an fd and a bs.
> Arguments that provide overlapping information make the function harder
> to understand and use correctly (there are combinations of these
> arguments that are invalid or don't make sense). Saving a few lines of
> code in the function implementation is a poor trade-off IMO.
My brain likes to agree but for some reason my heart really prefers
block layer functions (where I know what can go wrong) over POSIX
functions (where I always have the feeling of maybe not having though of
I guess I'll have to silence my heart for a bit, then.
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[Qemu-devel] [PATCH for-2.10 08/16] block/file-posix: Preallocation for truncate, Max Reitz, 2017/03/13
[Qemu-devel] [PATCH for-2.10 09/16] block/qcow2: Generalize preallocate(), Max Reitz, 2017/03/13
[Qemu-devel] [PATCH for-2.10 10/16] block/qcow2: Lock s->lock in preallocate(), Max Reitz, 2017/03/13
[Qemu-devel] [PATCH for-2.10 11/16] block/qcow2: Metadata preallocation for truncate, Max Reitz, 2017/03/13
- Re: [Qemu-devel] [Qemu-block] [PATCH for-2.10 03/16] block: Add PreallocMode to blk_truncate(), (continued)