diff options
| author | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-04-07 18:43:24 +0000 |
|---|---|---|
| committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-04-07 18:43:24 +0000 |
| commit | f141eafe286c785f7e2c1e312a73f90d66bdfb90 (patch) | |
| tree | 049474e891e06deec79bd3d58d49b49ba627276a /posix-aio-compat.h | |
| parent | c87c0672936a5b825c0b95bb1d7f5d6dc92294e4 (diff) | |
push down vector linearization to posix-aio-compat.c (Christoph Hellwig)
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
Diffstat (limited to 'posix-aio-compat.h')
| -rw-r--r-- | posix-aio-compat.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/posix-aio-compat.h b/posix-aio-compat.h index a1cdfd7f1f..1c5dcbd920 100644 --- a/posix-aio-compat.h +++ b/posix-aio-compat.h @@ -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; |