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qcow2: Avoid bounce buffers for AIO read requests

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qcow2 used to use bounce buffers for any AIO requests. This does not only imply
unnecessary copying, but also unbounded allocations which should be avoided.

This patch removes bounce buffers from the normal AIO read path, and constrains
them to a constant size for encrypted images.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-09-13 18:08:52 +02:00
parent b8a83a4f79
commit bd28f83565
3 changed files with 68 additions and 30 deletions
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4
block/qcow2.h
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@ -166,8 +166,8 @@ static inline int64_t align_offset(int64_t offset, int n)
// FIXME Need qcow2_ prefix to global functions
/* qcow2.c functions */
int qcow2_backing_read1(BlockDriverState *bs,
int64_t sector_num, uint8_t *buf, int nb_sectors);
int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t sector_num, int nb_sectors);
/* qcow2-refcount.c functions */
int qcow2_refcount_init(BlockDriverState *bs);