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implement qemu_blockalign (Stefano Stabellini)

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this patch adds a buffer_alignment field to BlockDriverState and
implements a qemu_blockalign function that uses that field to allocate a
memory aligned buffer to be used by the block driver.
buffer_alignment is initialized to 512 but each block driver can set
a different value (at the moment none of them do).
This patch modifies ide.c, block-qcow.c, block-qcow2.c and block.c to
use qemu_blockalign instead of qemu_memalign.
There is only one place left that still uses qemu_memalign to allocate
buffers used by block drivers that is posix-aio-compat:handle_aiocb_rw
because it is not possible to get the BlockDriverState from that
function. However I think it is not important because posix-aio-compat
already deals with driver specific code so it is supposed to know its
own needs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7229 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-04-22 20:20:00 +00:00
parent 94909d9fd9
commit e268ca5232
6 changed files with 18 additions and 6 deletions
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5
block_int.h
View file

@ -145,6 +145,9 @@ struct BlockDriverState {
/* Whether the disk can expand beyond total_sectors */
int growable;
/* the memory alignment required for the buffers handled by this driver */
int buffer_alignment;
/* NOTE: the following infos are only hints for real hardware
drivers. They are not used by the block driver */
int cyls, heads, secs, translation;
@ -173,6 +176,8 @@ void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);
void *qemu_blockalign(BlockDriverState *bs, size_t size);
extern BlockDriverState *bdrv_first;
#endif /* BLOCK_INT_H */