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Refactor AIO to allow multiple AIO implementations

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This patch refactors the AIO layer to allow multiple AIO implementations.  It's
only possible because of the recent signalfd() patch.  

Right now, the AIO infrastructure is pretty specific to the block raw backend.
For other block devices to implement AIO, the qemu_aio_wait function must
support registration.  This patch introduces a new function,
qemu_aio_set_fd_handler, which can be used to register a file descriptor to be
called back.  qemu_aio_wait() now polls a set of file descriptors registered
with this function until one becomes readable or writable.

This patch should allow the implementation of alternative AIO backends (via a
thread pool or linux-aio) and AIO backends in non-traditional block devices
(like NBD).

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5297 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-09-22 19:17:18 +00:00
parent 1121f87961
commit a76bab4952
8 changed files with 286 additions and 87 deletions
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6
block.h
View file

@ -1,6 +1,8 @@
#ifndef BLOCK_H
#define BLOCK_H
#include "qemu-aio.h"
/* block.c */
typedef struct BlockDriver BlockDriver;
@ -87,10 +89,6 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
BlockDriverCompletionFunc *cb, void *opaque);
void bdrv_aio_cancel(BlockDriverAIOCB *acb);
void qemu_aio_init(void);
void qemu_aio_flush(void);
void qemu_aio_wait(void);
int qemu_key_check(BlockDriverState *bs, const char *name);
/* Ensure contents are flushed to disk. */