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push down vector linearization to posix-aio-compat.c (Christoph Hellwig)

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Make all AIO requests vectored and defer linearization until the actual
I/O thread.  This prepares for using native preadv/pwritev.

Also enables asynchronous direct I/O by handling that case in the I/O thread.

Qcow and qcow2 propably want to be adopted to directly deal with multi-segment
requests, but that can be implemented later.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7020 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-04-07 18:43:24 +00:00
parent c87c067293
commit f141eafe28
7 changed files with 318 additions and 285 deletions
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9
posix-aio-compat.h
View file

@ -27,11 +27,18 @@
struct qemu_paiocb
{
int aio_fildes;
void *aio_buf;
union {
struct iovec *aio_iov;
void *aio_ioctl_buf;
};
int aio_niov;
size_t aio_nbytes;
#define aio_ioctl_cmd aio_nbytes /* for QEMU_PAIO_IOCTL */
int ev_signo;
off_t aio_offset;
unsigned aio_flags;
/* 512 byte alignment required for buffer, offset and length */
#define QEMU_AIO_SECTOR_ALIGNED 0x01
/* private */
TAILQ_ENTRY(qemu_paiocb) node;