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[Qemu-block] [PATCH v10 09/20] qcow2: Switch sectors_covered_by_bitmap_c
From: |
Eric Blake |
Subject: |
[Qemu-block] [PATCH v10 09/20] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based |
Date: |
Mon, 25 Sep 2017 09:55:15 -0500 |
We are gradually converting to byte-based interfaces, as they are
easier to reason about than sector-based. Change the qcow2 bitmap
helper function sectors_covered_by_bitmap_cluster(), renaming it
to bytes_covered_by_bitmap_cluster() in the process.
Signed-off-by: Eric Blake <address@hidden>
Reviewed-by: John Snow <address@hidden>
Reviewed-by: Kevin Wolf <address@hidden>
Reviewed-by: Fam Zheng <address@hidden>
---
v5: no change
v4: new patch
---
block/qcow2-bitmap.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 92098bfa49..4475273d8c 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -269,18 +269,16 @@ static int free_bitmap_clusters(BlockDriverState *bs,
Qcow2BitmapTable *tb)
return 0;
}
-/* This function returns the number of disk sectors covered by a single qcow2
- * cluster of bitmap data. */
-static uint64_t sectors_covered_by_bitmap_cluster(const BDRVQcow2State *s,
- const BdrvDirtyBitmap
*bitmap)
+/* Return the disk size covered by a single qcow2 cluster of bitmap data. */
+static uint64_t bytes_covered_by_bitmap_cluster(const BDRVQcow2State *s,
+ const BdrvDirtyBitmap *bitmap)
{
- uint64_t sector_granularity =
- bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS;
- uint64_t sbc = sector_granularity * (s->cluster_size << 3);
+ uint64_t granularity = bdrv_dirty_bitmap_granularity(bitmap);
+ uint64_t limit = granularity * (s->cluster_size << 3);
- assert(QEMU_IS_ALIGNED(sbc << BDRV_SECTOR_BITS,
+ assert(QEMU_IS_ALIGNED(limit,
bdrv_dirty_bitmap_serialization_align(bitmap)));
- return sbc;
+ return limit;
}
/* load_bitmap_data
@@ -293,7 +291,7 @@ static int load_bitmap_data(BlockDriverState *bs,
{
int ret = 0;
BDRVQcow2State *s = bs->opaque;
- uint64_t sector, sbc;
+ uint64_t sector, limit, sbc;
uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap);
uint64_t bm_sectors = DIV_ROUND_UP(bm_size, BDRV_SECTOR_SIZE);
uint8_t *buf = NULL;
@@ -306,7 +304,8 @@ static int load_bitmap_data(BlockDriverState *bs,
}
buf = g_malloc(s->cluster_size);
- sbc = sectors_covered_by_bitmap_cluster(s, bitmap);
+ limit = bytes_covered_by_bitmap_cluster(s, bitmap);
+ sbc = limit >> BDRV_SECTOR_BITS;
for (i = 0, sector = 0; i < tab_size; ++i, sector += sbc) {
uint64_t count = MIN(bm_sectors - sector, sbc);
uint64_t entry = bitmap_table[i];
@@ -1080,7 +1079,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
int ret;
BDRVQcow2State *s = bs->opaque;
int64_t sector;
- uint64_t sbc;
+ uint64_t limit, sbc;
uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap);
uint64_t bm_sectors = DIV_ROUND_UP(bm_size, BDRV_SECTOR_SIZE);
const char *bm_name = bdrv_dirty_bitmap_name(bitmap);
@@ -1106,8 +1105,9 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
dbi = bdrv_dirty_iter_new(bitmap, 0);
buf = g_malloc(s->cluster_size);
- sbc = sectors_covered_by_bitmap_cluster(s, bitmap);
- assert(DIV_ROUND_UP(bm_sectors, sbc) == tb_size);
+ limit = bytes_covered_by_bitmap_cluster(s, bitmap);
+ sbc = limit >> BDRV_SECTOR_BITS;
+ assert(DIV_ROUND_UP(bm_size, limit) == tb_size);
while ((sector = bdrv_dirty_iter_next(dbi)) != -1) {
uint64_t cluster = sector / sbc;
--
2.13.5
- [Qemu-block] [PATCH v10 02/20] hbitmap: Rename serialization_granularity to serialization_align, (continued)
- [Qemu-block] [PATCH v10 02/20] hbitmap: Rename serialization_granularity to serialization_align, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 04/20] dirty-bitmap: Drop unused functions, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 05/20] dirty-bitmap: Avoid size query failure during truncate, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 06/20] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 07/20] dirty-bitmap: Track bitmap size by bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 08/20] dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 09/20] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based,
Eric Blake <=
- [Qemu-block] [PATCH v10 10/20] dirty-bitmap: Set iterator start by offset, not sector, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 11/20] dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 12/20] dirty-bitmap: Change bdrv_get_dirty_count() to report bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 13/20] dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 15/20] mirror: Switch mirror_dirty_init() to byte-based iteration, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 14/20] dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 16/20] qcow2: Switch qcow2_measure() to byte-based iteration, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 17/20] qcow2: Switch load_bitmap_data() to byte-based iteration, Eric Blake, 2017/09/25
- [Qemu-block] [PATCH v10 18/20] qcow2: Switch store_bitmap_data() to byte-based iteration, Eric Blake, 2017/09/25