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block: allow customizing the granularity of the dirty bitmap

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Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-01-21 17:09:45 +01:00 • committed by Kevin Wolf
parent acc906c6c5
commit 50717e941b
5 changed files with 21 additions and 24 deletions
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14
block/mirror.c
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@ -17,14 +17,8 @@
#include "qemu/ratelimit.h"
#include "qemu/bitmap.h"
enum {
/*
* Size of data buffer for populating the image file. This should be large
* enough to process multiple clusters in a single call, so that populating
* contiguous regions of the image is efficient.
*/
BLOCK_SIZE = 512 * BDRV_SECTORS_PER_DIRTY_CHUNK, /* in bytes */
};
#define BLOCK_SIZE (1 << 20)
#define BDRV_SECTORS_PER_DIRTY_CHUNK (BLOCK_SIZE >> BDRV_SECTOR_BITS)
#define SLICE_TIME 100000000ULL /* ns */
@ -276,7 +270,7 @@ static void coroutine_fn mirror_run(void *opaque)
immediate_exit:
qemu_vfree(s->buf);
g_free(s->cow_bitmap);
bdrv_set_dirty_tracking(bs, false);
bdrv_set_dirty_tracking(bs, 0);
bdrv_iostatus_disable(s->target);
if (s->should_complete && ret == 0) {
if (bdrv_get_flags(s->target) != bdrv_get_flags(s->common.bs)) {
@ -364,7 +358,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
s->mode = mode;
s->buf_size = BLOCK_SIZE;
bdrv_set_dirty_tracking(bs, true);
bdrv_set_dirty_tracking(bs, BLOCK_SIZE);
bdrv_set_enable_write_cache(s->target, true);
bdrv_set_on_error(s->target, on_target_error, on_target_error);
bdrv_iostatus_enable(s->target);