* [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based
@ 2017-07-13 1:05 Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 01/18] dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented Eric Blake
` (17 more replies)
0 siblings, 18 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov
There are patches floating around to add NBD_CMD_BLOCK_STATUS,
but NBD wants to report status on byte granularity (even if the
reporting will probably be naturally aligned to sectors or even
much higher levels). I've therefore started the task of
converting our block status code to report at a byte granularity
rather than sectors.
The overall conversion currently looks like:
part 1: bdrv_is_allocated (merged, commit 51b0a488)
part 2: dirty-bitmap (this series, v4 was here [1])
part 3: bdrv_get_block_status (v2 is posted [2] and is mostly reviewed, but
needs a rebase)
part 4: upcoming series, for .bdrv_co_block_status (second half of v1 [3])
Available as a tag at:
git fetch git://repo.or.cz/qemu/ericb.git nbd-byte-dirty-v5
Depends on Max's block branch
[1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg00269.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg00427.html
[3] https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg02642.html
Differences in v5:
- add R-b as appropriate
- rebase to recent block commits (patch 13)
- fix bug in bdrv_measure that I found during the rebase (patch 14)
- fix botched rebase that messed up bdrv_dirty_bitmap_truncate (patch 5,
18) [John]
- tweak commit message of patch 9 to point out a temporary condition of
not being strict to C99 shift semantics (it goes away in 15)
001/18:[----] [--] 'dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented'
002/18:[----] [--] 'hbitmap: Rename serialization_granularity to serialization_align'
003/18:[----] [--] 'qcow2: Ensure bitmap serialization is aligned'
004/18:[----] [--] 'dirty-bitmap: Drop unused functions'
005/18:[0003] [FC] 'dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes'
006/18:[----] [--] 'dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes'
007/18:[----] [--] 'qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based'
008/18:[----] [--] 'dirty-bitmap: Set iterator start by offset, not sector'
009/18:[----] [--] 'dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset'
010/18:[----] [--] 'dirty-bitmap: Change bdrv_get_dirty_count() to report bytes'
011/18:[----] [--] 'dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes'
012/18:[----] [-C] 'dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes'
013/18:[0007] [FC] 'mirror: Switch mirror_dirty_init() to byte-based iteration'
014/18:[down] 'qcow2: Switch qcow2_measure() to byte-based iteration'
015/18:[----] [--] 'qcow2: Switch load_bitmap_data() to byte-based iteration'
016/18:[----] [--] 'qcow2: Switch store_bitmap_data() to byte-based iteration'
017/18:[----] [--] 'dirty-bitmap: Switch bdrv_set_dirty() to bytes'
018/18:[0003] [FC] 'dirty-bitmap: Convert internal hbitmap size/granularity'
Eric Blake (18):
dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented
hbitmap: Rename serialization_granularity to serialization_align
qcow2: Ensure bitmap serialization is aligned
dirty-bitmap: Drop unused functions
dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes
dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes
qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based
dirty-bitmap: Set iterator start by offset, not sector
dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset
dirty-bitmap: Change bdrv_get_dirty_count() to report bytes
dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes
dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes
mirror: Switch mirror_dirty_init() to byte-based iteration
qcow2: Switch qcow2_measure() to byte-based iteration
qcow2: Switch load_bitmap_data() to byte-based iteration
qcow2: Switch store_bitmap_data() to byte-based iteration
dirty-bitmap: Switch bdrv_set_dirty() to bytes
dirty-bitmap: Convert internal hbitmap size/granularity
include/block/block_int.h | 2 +-
include/block/dirty-bitmap.h | 41 +++++---------
include/qemu/hbitmap.h | 8 +--
block/backup.c | 7 +--
block/dirty-bitmap.c | 128 ++++++++++++++-----------------------------
block/io.c | 6 +-
block/mirror.c | 76 +++++++++++--------------
block/qcow2-bitmap.c | 57 +++++++++----------
block/qcow2.c | 22 ++++----
migration/block.c | 12 ++--
tests/test-hbitmap.c | 10 ++--
util/hbitmap.c | 8 +--
12 files changed, 152 insertions(+), 225 deletions(-)
--
2.9.4
^ permalink raw reply [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 01/18] dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 02/18] hbitmap: Rename serialization_granularity to serialization_align Eric Blake
` (16 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, qemu-stable, Fam Zheng, Max Reitz
We've been documenting the value in bytes since its introduction
in commit b9a9b3a4 (v1.3), where it was actually reported in bytes.
Commit e4654d2 (v2.0) then removed things from block/qapi.c, in
preparation for a rewrite to a list of dirty sectors in the next
commit 21b5683 in block.c, but the new code mistakenly started
reporting in sectors.
Fixes: https://bugzilla.redhat.com/1441460
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
Too late for 2.9, since the regression has been unnoticed for
nine releases. But worth putting in 2.9.1.
v2-v4: no change
---
block/dirty-bitmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 543bddb..30462d4 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -461,7 +461,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1);
BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1);
- info->count = bdrv_get_dirty_count(bm);
+ info->count = bdrv_get_dirty_count(bm) << BDRV_SECTOR_BITS;
info->granularity = bdrv_dirty_bitmap_granularity(bm);
info->has_name = !!bm->name;
info->name = g_strdup(bm->name);
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 02/18] hbitmap: Rename serialization_granularity to serialization_align
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 01/18] dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 03/18] qcow2: Ensure bitmap serialization is aligned Eric Blake
` (15 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz
The only client of hbitmap_serialization_granularity() is dirty-bitmap's
bdrv_dirty_bitmap_serialization_align(). Keeping the two names consistent
is worthwhile, and the shorter name is more representative of what the
function returns (the required alignment to be used for start/count of
other serialization functions, where violating the alignment causes
assertion failures).
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: new patch
---
include/qemu/hbitmap.h | 8 ++++----
block/dirty-bitmap.c | 2 +-
tests/test-hbitmap.c | 10 +++++-----
util/hbitmap.c | 8 ++++----
4 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index d3a74a2..81e7804 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -159,16 +159,16 @@ bool hbitmap_get(const HBitmap *hb, uint64_t item);
bool hbitmap_is_serializable(const HBitmap *hb);
/**
- * hbitmap_serialization_granularity:
+ * hbitmap_serialization_align:
* @hb: HBitmap to operate on.
*
- * Granularity of serialization chunks, used by other serialization functions.
- * For every chunk:
+ * Required alignment of serialization chunks, used by other serialization
+ * functions. For every chunk:
* 1. Chunk start should be aligned to this granularity.
* 2. Chunk size should be aligned too, except for last chunk (for which
* start + count == hb->size)
*/
-uint64_t hbitmap_serialization_granularity(const HBitmap *hb);
+uint64_t hbitmap_serialization_align(const HBitmap *hb);
/**
* hbitmap_serialization_size:
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 30462d4..0490ca3 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -617,7 +617,7 @@ uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap)
{
- return hbitmap_serialization_granularity(bitmap->bitmap);
+ return hbitmap_serialization_align(bitmap->bitmap);
}
void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap,
diff --git a/tests/test-hbitmap.c b/tests/test-hbitmap.c
index 1acb353..af41642 100644
--- a/tests/test-hbitmap.c
+++ b/tests/test-hbitmap.c
@@ -738,15 +738,15 @@ static void test_hbitmap_meta_one(TestHBitmapData *data, const void *unused)
}
}
-static void test_hbitmap_serialize_granularity(TestHBitmapData *data,
- const void *unused)
+static void test_hbitmap_serialize_align(TestHBitmapData *data,
+ const void *unused)
{
int r;
hbitmap_test_init(data, L3 * 2, 3);
g_assert(hbitmap_is_serializable(data->hb));
- r = hbitmap_serialization_granularity(data->hb);
+ r = hbitmap_serialization_align(data->hb);
g_assert_cmpint(r, ==, 64 << 3);
}
@@ -974,8 +974,8 @@ int main(int argc, char **argv)
hbitmap_test_add("/hbitmap/meta/word", test_hbitmap_meta_word);
hbitmap_test_add("/hbitmap/meta/sector", test_hbitmap_meta_sector);
- hbitmap_test_add("/hbitmap/serialize/granularity",
- test_hbitmap_serialize_granularity);
+ hbitmap_test_add("/hbitmap/serialize/align",
+ test_hbitmap_serialize_align);
hbitmap_test_add("/hbitmap/serialize/basic",
test_hbitmap_serialize_basic);
hbitmap_test_add("/hbitmap/serialize/part",
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 21535cc..2f9d0fd 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -413,14 +413,14 @@ bool hbitmap_is_serializable(const HBitmap *hb)
{
/* Every serialized chunk must be aligned to 64 bits so that endianness
* requirements can be fulfilled on both 64 bit and 32 bit hosts.
- * We have hbitmap_serialization_granularity() which converts this
+ * We have hbitmap_serialization_align() which converts this
* alignment requirement from bitmap bits to items covered (e.g. sectors).
* That value is:
* 64 << hb->granularity
* Since this value must not exceed UINT64_MAX, hb->granularity must be
* less than 58 (== 64 - 6, where 6 is ld(64), i.e. 1 << 6 == 64).
*
- * In order for hbitmap_serialization_granularity() to always return a
+ * In order for hbitmap_serialization_align() to always return a
* meaningful value, bitmaps that are to be serialized must have a
* granularity of less than 58. */
@@ -437,7 +437,7 @@ bool hbitmap_get(const HBitmap *hb, uint64_t item)
return (hb->levels[HBITMAP_LEVELS - 1][pos >> BITS_PER_LEVEL] & bit) != 0;
}
-uint64_t hbitmap_serialization_granularity(const HBitmap *hb)
+uint64_t hbitmap_serialization_align(const HBitmap *hb)
{
assert(hbitmap_is_serializable(hb));
@@ -454,7 +454,7 @@ static void serialization_chunk(const HBitmap *hb,
unsigned long **first_el, uint64_t *el_count)
{
uint64_t last = start + count - 1;
- uint64_t gran = hbitmap_serialization_granularity(hb);
+ uint64_t gran = hbitmap_serialization_align(hb);
assert((start & (gran - 1)) == 0);
assert((last >> hb->granularity) < hb->size);
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 03/18] qcow2: Ensure bitmap serialization is aligned
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 01/18] dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 02/18] hbitmap: Rename serialization_granularity to serialization_align Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 04/18] dirty-bitmap: Drop unused functions Eric Blake
` (14 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Max Reitz
When subdividing a bitmap serialization, the code in hbitmap.c
enforces that start/count parameters are aligned (except that
count can end early at end-of-bitmap). We exposed this required
alignment through bdrv_dirty_bitmap_serialization_align(), but
forgot to actually check that we comply with it.
Fortunately, qcow2 is never dividing bitmap serialization smaller
than one cluster (which is a minimum of 512 bytes); so we are
always compliant with the serialization alignment (which insists
that we partition at least 64 bits per chunk) because we are doing
at least 4k bits per chunk.
Still, it's safer to add an assertion (for the unlikely case that
we'd ever support a cluster smaller than 512 bytes, or if the
hbitmap implementation changes what it considers to be aligned),
rather than leaving bdrv_dirty_bitmap_serialization_align()
without a caller.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: new patch
---
block/qcow2-bitmap.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 3e8735a..5aa0b8d 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -274,10 +274,13 @@ static int free_bitmap_clusters(BlockDriverState *bs, Qcow2BitmapTable *tb)
static uint64_t sectors_covered_by_bitmap_cluster(const BDRVQcow2State *s,
const BdrvDirtyBitmap *bitmap)
{
- uint32_t sector_granularity =
+ uint64_t sector_granularity =
bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS;
+ uint64_t sbc = sector_granularity * (s->cluster_size << 3);
- return (uint64_t)sector_granularity * (s->cluster_size << 3);
+ assert(QEMU_IS_ALIGNED(sbc,
+ bdrv_dirty_bitmap_serialization_align(bitmap)));
+ return sbc;
}
/* load_bitmap_data
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 04/18] dirty-bitmap: Drop unused functions
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (2 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 03/18] qcow2: Ensure bitmap serialization is aligned Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes Eric Blake
` (13 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz
We had several functions that no one is currently using, and which
use sector-based interfaces. I'm trying to convert towards byte-based
interfaces, so it's easier to just drop the unused functions:
bdrv_dirty_bitmap_get_meta
bdrv_dirty_bitmap_get_meta_locked
bdrv_dirty_bitmap_reset_meta
bdrv_dirty_bitmap_meta_granularity
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: rebase to Vladimir's persistent bitmaps (bdrv_dirty_bitmap_size now
in use), dropped R-b
v3: rebase to upstream changes (bdrv_dirty_bitmap_get_meta_locked was
added in b64bd51e with no clients), kept R-b
v2: tweak commit message based on review, no code change
---
include/block/dirty-bitmap.h | 10 ----------
block/dirty-bitmap.c | 44 --------------------------------------------
2 files changed, 54 deletions(-)
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index a79a58d..8fd842e 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -34,7 +34,6 @@ void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs);
uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap);
-uint32_t bdrv_dirty_bitmap_meta_granularity(BdrvDirtyBitmap *bitmap);
bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap);
bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap);
const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap);
@@ -44,15 +43,6 @@ void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
-int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors);
-int bdrv_dirty_bitmap_get_meta_locked(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors);
-void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors);
BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap);
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
uint64_t first_sector);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 0490ca3..42a55e4 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -173,45 +173,6 @@ void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap)
qemu_mutex_unlock(bitmap->mutex);
}
-int bdrv_dirty_bitmap_get_meta_locked(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors)
-{
- uint64_t i;
- int sectors_per_bit = 1 << hbitmap_granularity(bitmap->meta);
-
- /* To optimize: we can make hbitmap to internally check the range in a
- * coarse level, or at least do it word by word. */
- for (i = sector; i < sector + nb_sectors; i += sectors_per_bit) {
- if (hbitmap_get(bitmap->meta, i)) {
- return true;
- }
- }
- return false;
-}
-
-int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors)
-{
- bool dirty;
-
- qemu_mutex_lock(bitmap->mutex);
- dirty = bdrv_dirty_bitmap_get_meta_locked(bs, bitmap, sector, nb_sectors);
- qemu_mutex_unlock(bitmap->mutex);
-
- return dirty;
-}
-
-void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs,
- BdrvDirtyBitmap *bitmap, int64_t sector,
- int nb_sectors)
-{
- qemu_mutex_lock(bitmap->mutex);
- hbitmap_reset(bitmap->meta, sector, nb_sectors);
- qemu_mutex_unlock(bitmap->mutex);
-}
-
int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap)
{
return bitmap->size;
@@ -511,11 +472,6 @@ uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap)
return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap);
}
-uint32_t bdrv_dirty_bitmap_meta_granularity(BdrvDirtyBitmap *bitmap)
-{
- return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->meta);
-}
-
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
uint64_t first_sector)
{
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (3 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 04/18] dirty-bitmap: Drop unused functions Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 17:37 ` John Snow
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 06/18] dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes Eric Blake
` (12 subsequent siblings)
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz
We are still using an internal hbitmap that tracks a size in sectors,
with the granularity scaled down accordingly, because it lets us
use a shortcut for our iterators which are currently sector-based.
But there's no reason we can't track the dirty bitmap size in bytes,
since it is (mostly) an internal-only variable (remember, the size
is how many bytes are covered by the bitmap, not how many bytes the
bitmap occupies). Furthermore, we're already reporting bytes for
bdrv_dirty_bitmap_granularity(); mixing bytes and sectors in our
return values is a recipe for confusion. A later cleanup will
convert dirty bitmap internals to be entirely byte-based,
eliminating the intermediate sector rounding added here; and
technically, since bdrv_getlength() already rounds up to sectors,
our use of DIV_ROUND_UP is more for theoretical completeness than
for any actual rounding.
The only external caller in qcow2-bitmap.c is temporarily more verbose
(because it is still using sector-based math), but will later be
switched to track progress by bytes instead of sectors.
Use is_power_of_2() while at it, instead of open-coding that, and
add an assertion where bdrv_getlength() should not fail.
Signed-off-by: Eric Blake <eblake@redhat.com>
---
v5: fix bdrv_dirty_bitmap_truncate [John], drop R-b
v4: retitle from "Track size in bytes", rebase to persistent bitmaps,
round up when converting bytes to sectors
v3: no change
v2: tweak commit message, no code change
---
block/dirty-bitmap.c | 26 +++++++++++++++-----------
block/qcow2-bitmap.c | 14 ++++++++------
2 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 42a55e4..e65ec4f 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -1,7 +1,7 @@
/*
* Block Dirty Bitmap
*
- * Copyright (c) 2016 Red Hat. Inc
+ * Copyright (c) 2016-2017 Red Hat. Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@@ -42,7 +42,7 @@ struct BdrvDirtyBitmap {
HBitmap *meta; /* Meta dirty bitmap */
BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */
char *name; /* Optional non-empty unique ID */
- int64_t size; /* Size of the bitmap (Number of sectors) */
+ int64_t size; /* Size of the bitmap, in bytes */
bool disabled; /* Bitmap is disabled. It ignores all writes to
the device */
int active_iterators; /* How many iterators are active */
@@ -115,17 +115,14 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
{
int64_t bitmap_size;
BdrvDirtyBitmap *bitmap;
- uint32_t sector_granularity;
- assert((granularity & (granularity - 1)) == 0);
+ assert(is_power_of_2(granularity) && granularity >= BDRV_SECTOR_SIZE);
if (name && bdrv_find_dirty_bitmap(bs, name)) {
error_setg(errp, "Bitmap already exists: %s", name);
return NULL;
}
- sector_granularity = granularity >> BDRV_SECTOR_BITS;
- assert(sector_granularity);
- bitmap_size = bdrv_nb_sectors(bs);
+ bitmap_size = bdrv_getlength(bs);
if (bitmap_size < 0) {
error_setg_errno(errp, -bitmap_size, "could not get length of device");
errno = -bitmap_size;
@@ -133,7 +130,12 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
}
bitmap = g_new0(BdrvDirtyBitmap, 1);
bitmap->mutex = &bs->dirty_bitmap_mutex;
- bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity));
+ /*
+ * TODO - let hbitmap track full granularity. For now, it is tracking
+ * only sector granularity, as a shortcut for our iterators.
+ */
+ bitmap->bitmap = hbitmap_alloc(DIV_ROUND_UP(bitmap_size, BDRV_SECTOR_SIZE),
+ ctz32(granularity) - BDRV_SECTOR_BITS);
bitmap->size = bitmap_size;
bitmap->name = g_strdup(name);
bitmap->disabled = false;
@@ -305,13 +307,14 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
{
BdrvDirtyBitmap *bitmap;
- uint64_t size = bdrv_nb_sectors(bs);
+ int64_t size = bdrv_getlength(bs);
+ assert(size >= 0);
bdrv_dirty_bitmaps_lock(bs);
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
assert(!bdrv_dirty_bitmap_frozen(bitmap));
assert(!bitmap->active_iterators);
- hbitmap_truncate(bitmap->bitmap, size);
+ hbitmap_truncate(bitmap->bitmap, DIV_ROUND_UP(size, BDRV_SECTOR_SIZE));
bitmap->size = size;
}
bdrv_dirty_bitmaps_unlock(bs);
@@ -549,7 +552,8 @@ void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out)
hbitmap_reset_all(bitmap->bitmap);
} else {
HBitmap *backup = bitmap->bitmap;
- bitmap->bitmap = hbitmap_alloc(bitmap->size,
+ bitmap->bitmap = hbitmap_alloc(DIV_ROUND_UP(bitmap->size,
+ BDRV_SECTOR_SIZE),
hbitmap_granularity(backup));
*out = backup;
}
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 5aa0b8d..d478fe8 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -295,10 +295,11 @@ static int load_bitmap_data(BlockDriverState *bs,
BDRVQcow2State *s = bs->opaque;
uint64_t sector, 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;
uint64_t i, tab_size =
size_to_clusters(s,
- bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
+ bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_sectors));
if (tab_size != bitmap_table_size || tab_size > BME_MAX_TABLE_SIZE) {
return -EINVAL;
@@ -307,7 +308,7 @@ static int load_bitmap_data(BlockDriverState *bs,
buf = g_malloc(s->cluster_size);
sbc = sectors_covered_by_bitmap_cluster(s, bitmap);
for (i = 0, sector = 0; i < tab_size; ++i, sector += sbc) {
- uint64_t count = MIN(bm_size - sector, sbc);
+ uint64_t count = MIN(bm_sectors - sector, sbc);
uint64_t entry = bitmap_table[i];
uint64_t offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
@@ -1073,13 +1074,14 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
int64_t sector;
uint64_t 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);
uint8_t *buf = NULL;
BdrvDirtyBitmapIter *dbi;
uint64_t *tb;
uint64_t tb_size =
size_to_clusters(s,
- bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
+ bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_sectors));
if (tb_size > BME_MAX_TABLE_SIZE ||
tb_size * s->cluster_size > BME_MAX_PHYS_SIZE)
@@ -1097,7 +1099,7 @@ 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_size, sbc) == tb_size);
+ assert(DIV_ROUND_UP(bm_sectors, sbc) == tb_size);
while ((sector = bdrv_dirty_iter_next(dbi)) != -1) {
uint64_t cluster = sector / sbc;
@@ -1105,7 +1107,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
int64_t off;
sector = cluster * sbc;
- end = MIN(bm_size, sector + sbc);
+ end = MIN(bm_sectors, sector + sbc);
write_size =
bdrv_dirty_bitmap_serialization_size(bitmap, sector, end - sector);
assert(write_size <= s->cluster_size);
@@ -1137,7 +1139,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
goto fail;
}
- if (end >= bm_size) {
+ if (end >= bm_sectors) {
break;
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 06/18] dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (4 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 07/18] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based Eric Blake
` (11 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz
Right now, the dirty-bitmap code exposes the fact that we use
a scale of sector granularity in the underlying hbitmap to anything
that wants to serialize a dirty bitmap. It's nicer to uniformly
expose bytes as our dirty-bitmap interface, matching the previous
change to bitmap size. The only caller to serialization is currently
qcow2-cluster.c, which becomes a bit more verbose because it is still
tracking sectors for other reasons, but a later patch will fix that
to more uniformly use byte offsets everywhere. Likewise, within
dirty-bitmap, we have to add more assertions that we are not
truncating incorrectly, which can go away once the internal hbitmap
is byte-based rather than sector-based.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: new patch
---
include/block/dirty-bitmap.h | 14 +++++++-------
block/dirty-bitmap.c | 37 ++++++++++++++++++++++++-------------
block/qcow2-bitmap.c | 22 ++++++++++++++--------
3 files changed, 45 insertions(+), 28 deletions(-)
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 8fd842e..f4ccd3f 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -49,19 +49,19 @@ BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count);
+ uint64_t offset, uint64_t bytes);
uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap);
void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap,
- uint8_t *buf, uint64_t start,
- uint64_t count);
+ uint8_t *buf, uint64_t offset,
+ uint64_t bytes);
void bdrv_dirty_bitmap_deserialize_part(BdrvDirtyBitmap *bitmap,
- uint8_t *buf, uint64_t start,
- uint64_t count, bool finish);
+ uint8_t *buf, uint64_t offset,
+ uint64_t bytes, bool finish);
void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count,
+ uint64_t offset, uint64_t bytes,
bool finish);
void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count,
+ uint64_t offset, uint64_t bytes,
bool finish);
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index e65ec4f..034effc 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -570,42 +570,53 @@ void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in)
}
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count)
+ uint64_t offset, uint64_t bytes)
{
- return hbitmap_serialization_size(bitmap->bitmap, start, count);
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
+ return hbitmap_serialization_size(bitmap->bitmap,
+ offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS);
}
uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap)
{
- return hbitmap_serialization_align(bitmap->bitmap);
+ return hbitmap_serialization_align(bitmap->bitmap) * BDRV_SECTOR_SIZE;
}
void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap,
- uint8_t *buf, uint64_t start,
- uint64_t count)
+ uint8_t *buf, uint64_t offset,
+ uint64_t bytes)
{
- hbitmap_serialize_part(bitmap->bitmap, buf, start, count);
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
+ hbitmap_serialize_part(bitmap->bitmap, buf, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS);
}
void bdrv_dirty_bitmap_deserialize_part(BdrvDirtyBitmap *bitmap,
- uint8_t *buf, uint64_t start,
- uint64_t count, bool finish)
+ uint8_t *buf, uint64_t offset,
+ uint64_t bytes, bool finish)
{
- hbitmap_deserialize_part(bitmap->bitmap, buf, start, count, finish);
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
+ hbitmap_deserialize_part(bitmap->bitmap, buf, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS, finish);
}
void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count,
+ uint64_t offset, uint64_t bytes,
bool finish)
{
- hbitmap_deserialize_zeroes(bitmap->bitmap, start, count, finish);
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
+ hbitmap_deserialize_zeroes(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS, finish);
}
void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap,
- uint64_t start, uint64_t count,
+ uint64_t offset, uint64_t bytes,
bool finish)
{
- hbitmap_deserialize_ones(bitmap->bitmap, start, count, finish);
+ assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
+ hbitmap_deserialize_ones(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
+ bytes >> BDRV_SECTOR_BITS, finish);
}
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index d478fe8..08fff96 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -278,7 +278,7 @@ static uint64_t sectors_covered_by_bitmap_cluster(const BDRVQcow2State *s,
bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS;
uint64_t sbc = sector_granularity * (s->cluster_size << 3);
- assert(QEMU_IS_ALIGNED(sbc,
+ assert(QEMU_IS_ALIGNED(sbc << BDRV_SECTOR_BITS,
bdrv_dirty_bitmap_serialization_align(bitmap)));
return sbc;
}
@@ -299,7 +299,7 @@ static int load_bitmap_data(BlockDriverState *bs,
uint8_t *buf = NULL;
uint64_t i, tab_size =
size_to_clusters(s,
- bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_sectors));
+ bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
if (tab_size != bitmap_table_size || tab_size > BME_MAX_TABLE_SIZE) {
return -EINVAL;
@@ -316,7 +316,9 @@ static int load_bitmap_data(BlockDriverState *bs,
if (offset == 0) {
if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) {
- bdrv_dirty_bitmap_deserialize_ones(bitmap, sector, count,
+ bdrv_dirty_bitmap_deserialize_ones(bitmap,
+ sector * BDRV_SECTOR_SIZE,
+ count * BDRV_SECTOR_SIZE,
false);
} else {
/* No need to deserialize zeros because the dirty bitmap is
@@ -327,7 +329,9 @@ static int load_bitmap_data(BlockDriverState *bs,
if (ret < 0) {
goto finish;
}
- bdrv_dirty_bitmap_deserialize_part(bitmap, buf, sector, count,
+ bdrv_dirty_bitmap_deserialize_part(bitmap, buf,
+ sector * BDRV_SECTOR_SIZE,
+ count * BDRV_SECTOR_SIZE,
false);
}
}
@@ -1081,7 +1085,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
uint64_t *tb;
uint64_t tb_size =
size_to_clusters(s,
- bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_sectors));
+ bdrv_dirty_bitmap_serialization_size(bitmap, 0, bm_size));
if (tb_size > BME_MAX_TABLE_SIZE ||
tb_size * s->cluster_size > BME_MAX_PHYS_SIZE)
@@ -1108,8 +1112,8 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
sector = cluster * sbc;
end = MIN(bm_sectors, sector + sbc);
- write_size =
- bdrv_dirty_bitmap_serialization_size(bitmap, sector, end - sector);
+ write_size = bdrv_dirty_bitmap_serialization_size(bitmap,
+ sector * BDRV_SECTOR_SIZE, (end - sector) * BDRV_SECTOR_SIZE);
assert(write_size <= s->cluster_size);
off = qcow2_alloc_clusters(bs, s->cluster_size);
@@ -1121,7 +1125,9 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
}
tb[cluster] = off;
- bdrv_dirty_bitmap_serialize_part(bitmap, buf, sector, end - sector);
+ bdrv_dirty_bitmap_serialize_part(bitmap, buf,
+ sector * BDRV_SECTOR_SIZE,
+ (end - sector) * BDRV_SECTOR_SIZE);
if (write_size < s->cluster_size) {
memset(buf + write_size, 0, s->cluster_size - write_size);
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 07/18] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (5 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 06/18] dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 08/18] dirty-bitmap: Set iterator start by offset, not sector Eric Blake
` (10 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Max Reitz
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 <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
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 08fff96..700f389 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];
@@ -1076,7 +1075,7 @@ 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);
@@ -1102,8 +1101,9 @@ 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;
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 08/18] dirty-bitmap: Set iterator start by offset, not sector
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (6 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 07/18] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 09/18] dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset Eric Blake
` (9 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Jeff Cody, Max Reitz, Fam Zheng
All callers to bdrv_dirty_iter_new() passed 0 for their initial
starting point, drop that parameter.
Most callers to bdrv_set_dirty_iter() were scaling a byte offset to
a sector number; the exception qcow2-bitmap will be converted later
to use byte rather than sector iteration. Move the scaling to occur
internally to dirty bitmap code instead, so that callers now pass
in bytes.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: rebase to persistent bitmaps
v3: no change
v2: no change
---
include/block/dirty-bitmap.h | 5 ++---
block/backup.c | 5 ++---
block/dirty-bitmap.c | 9 ++++-----
block/mirror.c | 4 ++--
block/qcow2-bitmap.c | 4 ++--
5 files changed, 12 insertions(+), 15 deletions(-)
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index f4ccd3f..ece28e1 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -44,8 +44,7 @@ void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap);
-BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
- uint64_t first_sector);
+BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap);
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
@@ -80,7 +79,7 @@ void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
-void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t sector_num);
+void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t offset);
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap);
void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);
diff --git a/block/backup.c b/block/backup.c
index b69184e..af0314f 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -372,7 +372,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap);
clusters_per_iter = MAX((granularity / job->cluster_size), 1);
- dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0);
+ dbi = bdrv_dirty_iter_new(job->sync_bitmap);
/* Find the next dirty sector(s) */
while ((offset = bdrv_dirty_iter_next(dbi) * BDRV_SECTOR_SIZE) >= 0) {
@@ -403,8 +403,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
/* If the bitmap granularity is smaller than the backup granularity,
* we need to advance the iterator pointer to the next cluster. */
if (granularity < job->cluster_size) {
- bdrv_set_dirty_iter(dbi,
- cluster * job->cluster_size / BDRV_SECTOR_SIZE);
+ bdrv_set_dirty_iter(dbi, cluster * job->cluster_size);
}
last_cluster = cluster - 1;
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 034effc..c091f0c 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -475,11 +475,10 @@ uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap)
return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap);
}
-BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap,
- uint64_t first_sector)
+BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap)
{
BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1);
- hbitmap_iter_init(&iter->hbi, bitmap->bitmap, first_sector);
+ hbitmap_iter_init(&iter->hbi, bitmap->bitmap, 0);
iter->bitmap = bitmap;
bitmap->active_iterators++;
return iter;
@@ -647,9 +646,9 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector,
/**
* Advance a BdrvDirtyBitmapIter to an arbitrary offset.
*/
-void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t sector_num)
+void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t offset)
{
- hbitmap_iter_init(&iter->hbi, iter->hbi.hb, sector_num);
+ hbitmap_iter_init(&iter->hbi, iter->hbi.hb, offset >> BDRV_SECTOR_BITS);
}
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap)
diff --git a/block/mirror.c b/block/mirror.c
index 8583b76..70586bb 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -373,7 +373,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
next_dirty = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
if (next_dirty > next_offset || next_dirty < 0) {
/* The bitmap iterator's cache is stale, refresh it */
- bdrv_set_dirty_iter(s->dbi, next_offset >> BDRV_SECTOR_BITS);
+ bdrv_set_dirty_iter(s->dbi, next_offset);
next_dirty = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
}
assert(next_dirty == next_offset);
@@ -796,7 +796,7 @@ static void coroutine_fn mirror_run(void *opaque)
}
assert(!s->dbi);
- s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0);
+ s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap);
for (;;) {
uint64_t delay_ns = 0;
int64_t cnt, delta;
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 700f389..0ae8d01 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1099,7 +1099,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
return NULL;
}
- dbi = bdrv_dirty_iter_new(bitmap, 0);
+ dbi = bdrv_dirty_iter_new(bitmap);
buf = g_malloc(s->cluster_size);
limit = bytes_covered_by_bitmap_cluster(s, bitmap);
sbc = limit >> BDRV_SECTOR_BITS;
@@ -1149,7 +1149,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
break;
}
- bdrv_set_dirty_iter(dbi, end);
+ bdrv_set_dirty_iter(dbi, end * BDRV_SECTOR_SIZE);
}
*bitmap_table_size = tb_size;
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 09/18] dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (7 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 08/18] dirty-bitmap: Set iterator start by offset, not sector Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 10/18] dirty-bitmap: Change bdrv_get_dirty_count() to report bytes Eric Blake
` (8 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Jeff Cody, Max Reitz, Fam Zheng
Thanks to recent cleanups, most callers were scaling a return value
of sectors into bytes (the exception, in qcow2-bitmap, will be
converted to byte-based iteration later - in particular, there will
be a few commits where we are temporarily relying on not-strict-C
right-shift of -1 still resulting in a -1). Update the interface to
do the scaling internally instead.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-By: John Snow <jsnow@redhat.com>
---
v5: no code change, tweak commit message
v4: rebase to persistent bitmap
v3: no change
v2: no change
---
block/backup.c | 2 +-
block/dirty-bitmap.c | 2 +-
block/mirror.c | 8 ++++----
block/qcow2-bitmap.c | 2 +-
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/block/backup.c b/block/backup.c
index af0314f..9e41eb2 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -375,7 +375,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
dbi = bdrv_dirty_iter_new(job->sync_bitmap);
/* Find the next dirty sector(s) */
- while ((offset = bdrv_dirty_iter_next(dbi) * BDRV_SECTOR_SIZE) >= 0) {
+ while ((offset = bdrv_dirty_iter_next(dbi)) >= 0) {
cluster = offset / job->cluster_size;
/* Fake progress updates for any clusters we skipped */
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index c091f0c..20f2308 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -505,7 +505,7 @@ void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter)
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
{
- return hbitmap_iter_next(&iter->hbi);
+ return hbitmap_iter_next(&iter->hbi) * BDRV_SECTOR_SIZE;
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
diff --git a/block/mirror.c b/block/mirror.c
index 70586bb..4bae86a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -336,10 +336,10 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
int max_io_bytes = MAX(s->buf_size / MAX_IN_FLIGHT, MAX_IO_BYTES);
bdrv_dirty_bitmap_lock(s->dirty_bitmap);
- offset = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
+ offset = bdrv_dirty_iter_next(s->dbi);
if (offset < 0) {
bdrv_set_dirty_iter(s->dbi, 0);
- offset = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
+ offset = bdrv_dirty_iter_next(s->dbi);
trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap) *
BDRV_SECTOR_SIZE);
assert(offset >= 0);
@@ -370,11 +370,11 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
break;
}
- next_dirty = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
+ next_dirty = bdrv_dirty_iter_next(s->dbi);
if (next_dirty > next_offset || next_dirty < 0) {
/* The bitmap iterator's cache is stale, refresh it */
bdrv_set_dirty_iter(s->dbi, next_offset);
- next_dirty = bdrv_dirty_iter_next(s->dbi) * BDRV_SECTOR_SIZE;
+ next_dirty = bdrv_dirty_iter_next(s->dbi);
}
assert(next_dirty == next_offset);
nb_chunks++;
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 0ae8d01..5540fba 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1105,7 +1105,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
sbc = limit >> BDRV_SECTOR_BITS;
assert(DIV_ROUND_UP(bm_size, limit) == tb_size);
- while ((sector = bdrv_dirty_iter_next(dbi)) != -1) {
+ while ((sector = bdrv_dirty_iter_next(dbi) >> BDRV_SECTOR_BITS) != -1) {
uint64_t cluster = sector / sbc;
uint64_t end, write_size;
int64_t off;
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 10/18] dirty-bitmap: Change bdrv_get_dirty_count() to report bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (8 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 09/18] dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 11/18] dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes Eric Blake
` (7 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz,
Jeff Cody, Stefan Hajnoczi, Juan Quintela,
Dr. David Alan Gilbert
Thanks to recent cleanups, all callers were scaling a return value
of sectors into bytes; do the scaling internally instead.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
---
v4: no change
v3: no change, add R-b
v2: no change
---
block/dirty-bitmap.c | 4 ++--
block/mirror.c | 13 +++++--------
migration/block.c | 2 +-
3 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 20f2308..f983d99 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -425,7 +425,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1);
BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1);
- info->count = bdrv_get_dirty_count(bm) << BDRV_SECTOR_BITS;
+ info->count = bdrv_get_dirty_count(bm);
info->granularity = bdrv_dirty_bitmap_granularity(bm);
info->has_name = !!bm->name;
info->name = g_strdup(bm->name);
@@ -653,7 +653,7 @@ void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t offset)
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap)
{
- return hbitmap_count(bitmap->bitmap);
+ return hbitmap_count(bitmap->bitmap) << BDRV_SECTOR_BITS;
}
int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap)
diff --git a/block/mirror.c b/block/mirror.c
index 4bae86a..20f13ad 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -811,11 +811,10 @@ static void coroutine_fn mirror_run(void *opaque)
cnt = bdrv_get_dirty_count(s->dirty_bitmap);
/* s->common.offset contains the number of bytes already processed so
- * far, cnt is the number of dirty sectors remaining and
+ * far, cnt is the number of dirty bytes remaining and
* s->bytes_in_flight is the number of bytes currently being
* processed; together those are the current total operation length */
- s->common.len = s->common.offset + s->bytes_in_flight +
- cnt * BDRV_SECTOR_SIZE;
+ s->common.len = s->common.offset + s->bytes_in_flight + cnt;
/* Note that even when no rate limit is applied we need to yield
* periodically with no pending I/O so that bdrv_drain_all() returns.
@@ -827,8 +826,7 @@ static void coroutine_fn mirror_run(void *opaque)
s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 ||
(cnt == 0 && s->in_flight > 0)) {
- trace_mirror_yield(s, cnt * BDRV_SECTOR_SIZE,
- s->buf_free_count, s->in_flight);
+ trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight);
mirror_wait_for_io(s);
continue;
} else if (cnt != 0) {
@@ -869,7 +867,7 @@ static void coroutine_fn mirror_run(void *opaque)
* whether to switch to target check one last time if I/O has
* come in the meanwhile, and if not flush the data to disk.
*/
- trace_mirror_before_drain(s, cnt * BDRV_SECTOR_SIZE);
+ trace_mirror_before_drain(s, cnt);
bdrv_drained_begin(bs);
cnt = bdrv_get_dirty_count(s->dirty_bitmap);
@@ -888,8 +886,7 @@ static void coroutine_fn mirror_run(void *opaque)
}
ret = 0;
- trace_mirror_before_sleep(s, cnt * BDRV_SECTOR_SIZE,
- s->synced, delay_ns);
+ trace_mirror_before_sleep(s, cnt, s->synced, delay_ns);
if (!s->synced) {
block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
if (block_job_is_cancelled(&s->common)) {
diff --git a/migration/block.c b/migration/block.c
index 9171f60..a351294 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -667,7 +667,7 @@ static int64_t get_remaining_dirty(void)
aio_context_release(blk_get_aio_context(bmds->blk));
}
- return dirty << BDRV_SECTOR_BITS;
+ return dirty;
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 11/18] dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (9 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 10/18] dirty-bitmap: Change bdrv_get_dirty_count() to report bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 12/18] dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes Eric Blake
` (6 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz,
Jeff Cody, Stefan Hajnoczi, Juan Quintela,
Dr. David Alan Gilbert
Half the callers were already scaling bytes to sectors; the other
half can eventually be simplified to use byte iteration. Both
callers were already using the result as a bool, so make that
explicit. Making the change also makes it easier for a future
dirty-bitmap patch to offload scaling over to the internal hbitmap.
Remember, asking whether a byte is dirty is effectively asking
whether the entire granularity containing the byte is dirty, since
we only track dirtiness by granularity.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
---
v4: only context change
v3: rebase to _locked rename was straightforward enough that R-b kept
v2: tweak commit message, no code change
---
include/block/dirty-bitmap.h | 4 ++--
block/dirty-bitmap.c | 8 ++++----
block/mirror.c | 3 +--
migration/block.c | 3 ++-
4 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index ece28e1..1dddcd3 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -72,8 +72,8 @@ void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap,
/* Functions that require manual locking. */
void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap);
void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap);
-int bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
- int64_t sector);
+bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ int64_t offset);
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t cur_sector, int64_t nr_sectors);
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index f983d99..8b3c022 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -440,13 +440,13 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
-int bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
- int64_t sector)
+bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ int64_t offset)
{
if (bitmap) {
- return hbitmap_get(bitmap->bitmap, sector);
+ return hbitmap_get(bitmap->bitmap, offset >> BDRV_SECTOR_BITS);
} else {
- return 0;
+ return false;
}
}
diff --git a/block/mirror.c b/block/mirror.c
index 20f13ad..93e7013 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -362,8 +362,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
int64_t next_offset = offset + nb_chunks * s->granularity;
int64_t next_chunk = next_offset / s->granularity;
if (next_offset >= s->bdev_length ||
- !bdrv_get_dirty_locked(source, s->dirty_bitmap,
- next_offset >> BDRV_SECTOR_BITS)) {
+ !bdrv_get_dirty_locked(source, s->dirty_bitmap, next_offset)) {
break;
}
if (test_bit(next_chunk, s->in_flight_bitmap)) {
diff --git a/migration/block.c b/migration/block.c
index a351294..b618869 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -530,7 +530,8 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
blk_mig_unlock();
}
bdrv_dirty_bitmap_lock(bmds->dirty_bitmap);
- if (bdrv_get_dirty_locked(bs, bmds->dirty_bitmap, sector)) {
+ if (bdrv_get_dirty_locked(bs, bmds->dirty_bitmap,
+ sector * BDRV_SECTOR_SIZE)) {
if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = total_sectors - sector;
} else {
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 12/18] dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (10 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 11/18] dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration Eric Blake
` (5 subsequent siblings)
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz,
Jeff Cody, Stefan Hajnoczi, Juan Quintela,
Dr. David Alan Gilbert
Some of the callers were already scaling bytes to sectors; others
can be easily converted to pass byte offsets, all in our shift
towards a consistent byte interface everywhere. Making the change
will also make it easier to write the hold-out callers to use byte
rather than sectors for their iterations; it also makes it easier
for a future dirty-bitmap patch to offload scaling over to the
internal hbitmap. Although all callers happen to pass
sector-aligned values, make the internal scaling robust to any
sub-sector requests.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: only context change
v4: only context change, due to rebasing to persistent bitmaps
v3: rebase to addition of _locked interfaces; complex enough that I
dropped R-b
v2: no change
---
include/block/dirty-bitmap.h | 8 ++++----
block/dirty-bitmap.c | 22 ++++++++++++++--------
block/mirror.c | 16 ++++++++--------
migration/block.c | 7 +++++--
4 files changed, 31 insertions(+), 22 deletions(-)
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 1dddcd3..0341a60 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -40,9 +40,9 @@ const char *bdrv_dirty_bitmap_name(const BdrvDirtyBitmap *bitmap);
int64_t bdrv_dirty_bitmap_size(const BdrvDirtyBitmap *bitmap);
DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap);
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors);
+ int64_t offset, int64_t bytes);
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors);
+ int64_t offset, int64_t bytes);
BdrvDirtyBitmapIter *bdrv_dirty_meta_iter_new(BdrvDirtyBitmap *bitmap);
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap);
void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);
@@ -75,9 +75,9 @@ void bdrv_dirty_bitmap_unlock(BdrvDirtyBitmap *bitmap);
bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t offset);
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors);
+ int64_t offset, int64_t bytes);
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors);
+ int64_t offset, int64_t bytes);
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t offset);
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 8b3c022..9821225 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -510,35 +510,41 @@ int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
/* Called within bdrv_dirty_bitmap_lock..unlock */
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors)
+ int64_t offset, int64_t bytes)
{
+ int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
+
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
+ hbitmap_set(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
+ end_sector - (offset >> BDRV_SECTOR_BITS));
}
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors)
+ int64_t offset, int64_t bytes)
{
bdrv_dirty_bitmap_lock(bitmap);
- bdrv_set_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
+ bdrv_set_dirty_bitmap_locked(bitmap, offset, bytes);
bdrv_dirty_bitmap_unlock(bitmap);
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors)
+ int64_t offset, int64_t bytes)
{
+ int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
+
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
+ hbitmap_reset(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
+ end_sector - (offset >> BDRV_SECTOR_BITS));
}
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
- int64_t cur_sector, int64_t nr_sectors)
+ int64_t offset, int64_t bytes)
{
bdrv_dirty_bitmap_lock(bitmap);
- bdrv_reset_dirty_bitmap_locked(bitmap, cur_sector, nr_sectors);
+ bdrv_reset_dirty_bitmap_locked(bitmap, offset, bytes);
bdrv_dirty_bitmap_unlock(bitmap);
}
diff --git a/block/mirror.c b/block/mirror.c
index 93e7013..d0f0b87 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -141,8 +141,7 @@ static void mirror_write_complete(void *opaque, int ret)
if (ret < 0) {
BlockErrorAction action;
- bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS,
- op->bytes >> BDRV_SECTOR_BITS);
+ bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes);
action = mirror_error_action(s, false, -ret);
if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
s->ret = ret;
@@ -161,8 +160,7 @@ static void mirror_read_complete(void *opaque, int ret)
if (ret < 0) {
BlockErrorAction action;
- bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS,
- op->bytes >> BDRV_SECTOR_BITS);
+ bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes);
action = mirror_error_action(s, true, -ret);
if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
s->ret = ret;
@@ -383,8 +381,8 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
* calling bdrv_get_block_status_above could yield - if some blocks are
* marked dirty in this window, we need to know.
*/
- bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset >> BDRV_SECTOR_BITS,
- nb_chunks * sectors_per_chunk);
+ bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset,
+ nb_chunks * s->granularity);
bdrv_dirty_bitmap_unlock(s->dirty_bitmap);
bitmap_set(s->in_flight_bitmap, offset / s->granularity, nb_chunks);
@@ -626,7 +624,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
if (base == NULL && !bdrv_has_zero_init(target_bs)) {
if (!bdrv_can_write_zeroes_with_unmap(target_bs)) {
- bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end);
+ bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length);
return 0;
}
@@ -682,7 +680,9 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
n = count >> BDRV_SECTOR_BITS;
assert(n > 0);
if (ret == 1) {
- bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n);
+ bdrv_set_dirty_bitmap(s->dirty_bitmap,
+ sector_num * BDRV_SECTOR_SIZE,
+ n * BDRV_SECTOR_SIZE);
}
sector_num += n;
}
diff --git a/migration/block.c b/migration/block.c
index b618869..725f197 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -329,7 +329,8 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
0, blk_mig_read_cb, blk);
- bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector, nr_sectors);
+ bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
+ nr_sectors * BDRV_SECTOR_SIZE);
aio_context_release(blk_get_aio_context(bmds->blk));
qemu_mutex_unlock_iothread();
@@ -537,7 +538,9 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
} else {
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
}
- bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap, sector, nr_sectors);
+ bdrv_reset_dirty_bitmap_locked(bmds->dirty_bitmap,
+ sector * BDRV_SECTOR_SIZE,
+ nr_sectors * BDRV_SECTOR_SIZE);
bdrv_dirty_bitmap_unlock(bmds->dirty_bitmap);
blk = g_new(BlkMigBlock, 1);
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (11 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 12/18] dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 18:34 ` John Snow
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() " Eric Blake
` (4 subsequent siblings)
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Jeff Cody, Max Reitz
Now that we have adjusted the majority of the calls this function
makes to be byte-based, it is easier to read the code if it makes
passes over the image using bytes rather than sectors.
Signed-off-by: Eric Blake <eblake@redhat.com>
---
v5: rebase to earlier changes
v2-v4: no change
---
block/mirror.c | 38 ++++++++++++++------------------------
1 file changed, 14 insertions(+), 24 deletions(-)
diff --git a/block/mirror.c b/block/mirror.c
index d0f0b87..4ad4203 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -613,15 +613,13 @@ static void mirror_throttle(MirrorBlockJob *s)
static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
{
- int64_t sector_num, end;
+ int64_t offset;
BlockDriverState *base = s->base;
BlockDriverState *bs = s->source;
BlockDriverState *target_bs = blk_bs(s->target);
- int ret, n;
+ int ret;
int64_t count;
- end = s->bdev_length / BDRV_SECTOR_SIZE;
-
if (base == NULL && !bdrv_has_zero_init(target_bs)) {
if (!bdrv_can_write_zeroes_with_unmap(target_bs)) {
bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length);
@@ -629,9 +627,9 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
}
s->initial_zeroing_ongoing = true;
- for (sector_num = 0; sector_num < end; ) {
- int nb_sectors = MIN(end - sector_num,
- QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS);
+ for (offset = 0; offset < s->bdev_length; ) {
+ int bytes = MIN(s->bdev_length - offset,
+ QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
mirror_throttle(s);
@@ -647,9 +645,8 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
continue;
}
- mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE,
- nb_sectors * BDRV_SECTOR_SIZE, false);
- sector_num += nb_sectors;
+ mirror_do_zero_or_discard(s, offset, bytes, false);
+ offset += bytes;
}
mirror_wait_for_all_io(s);
@@ -657,10 +654,10 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
}
/* First part, loop on the sectors and initialize the dirty bitmap. */
- for (sector_num = 0; sector_num < end; ) {
+ for (offset = 0; offset < s->bdev_length; ) {
/* Just to make sure we are not exceeding int limit. */
- int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS,
- end - sector_num);
+ int bytes = MIN(s->bdev_length - offset,
+ QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
mirror_throttle(s);
@@ -668,23 +665,16 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
return 0;
}
- ret = bdrv_is_allocated_above(bs, base, sector_num * BDRV_SECTOR_SIZE,
- nb_sectors * BDRV_SECTOR_SIZE, &count);
+ ret = bdrv_is_allocated_above(bs, base, offset, bytes, &count);
if (ret < 0) {
return ret;
}
- /* TODO: Relax this once bdrv_is_allocated_above and dirty
- * bitmaps no longer require sector alignment. */
- assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE));
- n = count >> BDRV_SECTOR_BITS;
- assert(n > 0);
+ assert(count);
if (ret == 1) {
- bdrv_set_dirty_bitmap(s->dirty_bitmap,
- sector_num * BDRV_SECTOR_SIZE,
- n * BDRV_SECTOR_SIZE);
+ bdrv_set_dirty_bitmap(s->dirty_bitmap, offset, count);
}
- sector_num += n;
+ offset += count;
}
return 0;
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() to byte-based iteration
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (12 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 18:49 ` John Snow
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() " Eric Blake
` (3 subsequent siblings)
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Max Reitz
This is new code, but it is easier to read if it makes passes over
the image using bytes rather than sectors (and will get easier in
the future when bdrv_get_block_status is converted to byte-based).
While at it, fix a bug in the computation of nb_sectors using MAX
rather than MIN and thus always passing INT_MAX (thankfully, the
bug was harmless, as bdrv_get_block_status_above() clamps its
answers according to image size).
Signed-off-by: Eric Blake <eblake@redhat.com>
---
v5: new patch
---
block/qcow2.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index c144ea5..85ee9b2 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3662,20 +3662,19 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
*/
required = virtual_size;
} else {
- int cluster_sectors = cluster_size / BDRV_SECTOR_SIZE;
- int64_t sector_num;
+ int64_t offset;
int pnum = 0;
- for (sector_num = 0;
- sector_num < ssize / BDRV_SECTOR_SIZE;
- sector_num += pnum) {
- int nb_sectors = MAX(ssize / BDRV_SECTOR_SIZE - sector_num,
- INT_MAX);
+ for (offset = 0; offset < ssize;
+ offset += pnum * BDRV_SECTOR_SIZE) {
+ int nb_sectors = MIN(ssize - offset,
+ INT_MAX) / BDRV_SECTOR_SIZE;
BlockDriverState *file;
int64_t ret;
ret = bdrv_get_block_status_above(in_bs, NULL,
- sector_num, nb_sectors,
+ offset >> BDRV_SECTOR_BITS,
+ nb_sectors,
&pnum, &file);
if (ret < 0) {
error_setg_errno(&local_err, -ret,
@@ -3688,12 +3687,11 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
} else if ((ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) ==
(BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) {
/* Extend pnum to end of cluster for next iteration */
- pnum = ROUND_UP(sector_num + pnum, cluster_sectors) -
- sector_num;
+ pnum = (ROUND_UP(offset + pnum * BDRV_SECTOR_SIZE,
+ cluster_size) - offset) >> BDRV_SECTOR_BITS;
/* Count clusters we've seen */
- required += (sector_num % cluster_sectors + pnum) *
- BDRV_SECTOR_SIZE;
+ required += offset % cluster_size + pnum * BDRV_SECTOR_SIZE;
}
}
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() to byte-based iteration
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (13 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() " Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 11:03 ` Vladimir Sementsov-Ogievskiy
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() " Eric Blake
` (2 subsequent siblings)
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Max Reitz
Now that we have adjusted the majority of the calls this function
makes to be byte-based, it is easier to read the code if it makes
passes over the image using bytes rather than sectors.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: new patch
---
block/qcow2-bitmap.c | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 5540fba..c44cf78 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -291,9 +291,8 @@ static int load_bitmap_data(BlockDriverState *bs,
{
int ret = 0;
BDRVQcow2State *s = bs->opaque;
- uint64_t sector, limit, sbc;
+ uint64_t offset, limit;
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;
uint64_t i, tab_size =
size_to_clusters(s,
@@ -305,32 +304,27 @@ static int load_bitmap_data(BlockDriverState *bs,
buf = g_malloc(s->cluster_size);
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);
+ for (i = 0, offset = 0; i < tab_size; ++i, offset += limit) {
+ uint64_t count = MIN(bm_size - offset, limit);
uint64_t entry = bitmap_table[i];
- uint64_t offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
+ uint64_t data_offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
assert(check_table_entry(entry, s->cluster_size) == 0);
- if (offset == 0) {
+ if (data_offset == 0) {
if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) {
- bdrv_dirty_bitmap_deserialize_ones(bitmap,
- sector * BDRV_SECTOR_SIZE,
- count * BDRV_SECTOR_SIZE,
+ bdrv_dirty_bitmap_deserialize_ones(bitmap, offset, count,
false);
} else {
/* No need to deserialize zeros because the dirty bitmap is
* already cleared */
}
} else {
- ret = bdrv_pread(bs->file, offset, buf, s->cluster_size);
+ ret = bdrv_pread(bs->file, data_offset, buf, s->cluster_size);
if (ret < 0) {
goto finish;
}
- bdrv_dirty_bitmap_deserialize_part(bitmap, buf,
- sector * BDRV_SECTOR_SIZE,
- count * BDRV_SECTOR_SIZE,
+ bdrv_dirty_bitmap_deserialize_part(bitmap, buf, offset, count,
false);
}
}
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() to byte-based iteration
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (14 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() " Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 17/18] dirty-bitmap: Switch bdrv_set_dirty() to bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity Eric Blake
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Max Reitz
Now that we have adjusted the majority of the calls this function
makes to be byte-based, it is easier to read the code if it makes
passes over the image using bytes rather than sectors.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v5: no change
v4: new patch
---
block/qcow2-bitmap.c | 26 +++++++++++---------------
1 file changed, 11 insertions(+), 15 deletions(-)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index c44cf78..d1537a8 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1068,10 +1068,9 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
{
int ret;
BDRVQcow2State *s = bs->opaque;
- int64_t sector;
- uint64_t limit, sbc;
+ int64_t offset;
+ uint64_t limit;
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);
uint8_t *buf = NULL;
BdrvDirtyBitmapIter *dbi;
@@ -1096,18 +1095,17 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
dbi = bdrv_dirty_iter_new(bitmap);
buf = g_malloc(s->cluster_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) >> BDRV_SECTOR_BITS) != -1) {
- uint64_t cluster = sector / sbc;
+ while ((offset = bdrv_dirty_iter_next(dbi)) != -1) {
+ uint64_t cluster = offset / limit;
uint64_t end, write_size;
int64_t off;
- sector = cluster * sbc;
- end = MIN(bm_sectors, sector + sbc);
- write_size = bdrv_dirty_bitmap_serialization_size(bitmap,
- sector * BDRV_SECTOR_SIZE, (end - sector) * BDRV_SECTOR_SIZE);
+ offset = cluster * limit;
+ end = MIN(bm_size, offset + limit);
+ write_size = bdrv_dirty_bitmap_serialization_size(bitmap, offset,
+ end - offset);
assert(write_size <= s->cluster_size);
off = qcow2_alloc_clusters(bs, s->cluster_size);
@@ -1119,9 +1117,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
}
tb[cluster] = off;
- bdrv_dirty_bitmap_serialize_part(bitmap, buf,
- sector * BDRV_SECTOR_SIZE,
- (end - sector) * BDRV_SECTOR_SIZE);
+ bdrv_dirty_bitmap_serialize_part(bitmap, buf, offset, end - offset);
if (write_size < s->cluster_size) {
memset(buf + write_size, 0, s->cluster_size - write_size);
}
@@ -1139,11 +1135,11 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs,
goto fail;
}
- if (end >= bm_sectors) {
+ if (end >= bm_size) {
break;
}
- bdrv_set_dirty_iter(dbi, end * BDRV_SECTOR_SIZE);
+ bdrv_set_dirty_iter(dbi, end);
}
*bitmap_table_size = tb_size;
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 17/18] dirty-bitmap: Switch bdrv_set_dirty() to bytes
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (15 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() " Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity Eric Blake
17 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz,
Stefan Hajnoczi
Both callers already had bytes available, but were scaling to
sectors. Move the scaling to internal code. In the case of
bdrv_aligned_pwritev(), we are now passing the exact offset
rather than a rounded sector-aligned value, but that's okay
as long as dirty bitmap widens start/bytes to granularity
boundaries.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
v4: only context changes
v3: rebase to lock context changes, R-b kept
v2: no change
---
include/block/block_int.h | 2 +-
block/dirty-bitmap.c | 7 ++++---
block/io.c | 6 ++----
3 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 669a279..daa9804 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -969,7 +969,7 @@ void blk_dev_eject_request(BlockBackend *blk, bool force);
bool blk_dev_is_tray_open(BlockBackend *blk);
bool blk_dev_is_medium_locked(BlockBackend *blk);
-void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int64_t nr_sect);
+void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes);
bool bdrv_requests_pending(BlockDriverState *bs);
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 9821225..b54eed4 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -629,10 +629,10 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap)
hbitmap_deserialize_finish(bitmap->bitmap);
}
-void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector,
- int64_t nr_sectors)
+void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
BdrvDirtyBitmap *bitmap;
+ int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
if (QLIST_EMPTY(&bs->dirty_bitmaps)) {
return;
@@ -644,7 +644,8 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector,
continue;
}
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
+ hbitmap_set(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
+ end_sector - (offset >> BDRV_SECTOR_BITS));
}
bdrv_dirty_bitmaps_unlock(bs);
}
diff --git a/block/io.c b/block/io.c
index b413727..78e8e65 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1310,7 +1310,6 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
bool waited;
int ret;
- int64_t start_sector = offset >> BDRV_SECTOR_BITS;
int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
uint64_t bytes_remaining = bytes;
int max_transfer;
@@ -1385,7 +1384,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
bdrv_debug_event(bs, BLKDBG_PWRITEV_DONE);
atomic_inc(&bs->write_gen);
- bdrv_set_dirty(bs, start_sector, end_sector - start_sector);
+ bdrv_set_dirty(bs, offset, bytes);
stat64_max(&bs->wr_highest_offset, offset + bytes);
@@ -2389,8 +2388,7 @@ int coroutine_fn bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset,
ret = 0;
out:
atomic_inc(&bs->write_gen);
- bdrv_set_dirty(bs, req.offset >> BDRV_SECTOR_BITS,
- req.bytes >> BDRV_SECTOR_BITS);
+ bdrv_set_dirty(bs, req.offset, req.bytes);
tracked_request_end(&req);
bdrv_dec_in_flight(bs);
return ret;
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
` (16 preceding siblings ...)
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 17/18] dirty-bitmap: Switch bdrv_set_dirty() to bytes Eric Blake
@ 2017-07-13 1:05 ` Eric Blake
2017-07-13 19:01 ` John Snow
17 siblings, 1 reply; 27+ messages in thread
From: Eric Blake @ 2017-07-13 1:05 UTC (permalink / raw)
To: qemu-devel; +Cc: kwolf, jsnow, qemu-block, vsementsov, Fam Zheng, Max Reitz
Now that all callers are using byte-based interfaces, there's no
reason for our internal hbitmap to remain with sector-based
granularity. It also simplifies our internal scaling, since we
already know that hbitmap widens requests out to granularity
boundaries.
Signed-off-by: Eric Blake <eblake@redhat.com>
---
v5: fix bdrv_dirty_bitmap_truncate [John]
v4: rebase to earlier changes, include serialization, R-b dropped
v3: no change
v2: no change
---
block/dirty-bitmap.c | 61 ++++++++++++++++------------------------------------
1 file changed, 18 insertions(+), 43 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index b54eed4..0b349f0 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -38,7 +38,7 @@
*/
struct BdrvDirtyBitmap {
QemuMutex *mutex;
- HBitmap *bitmap; /* Dirty sector bitmap implementation */
+ HBitmap *bitmap; /* Dirty bitmap implementation */
HBitmap *meta; /* Meta dirty bitmap */
BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */
char *name; /* Optional non-empty unique ID */
@@ -130,12 +130,7 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
}
bitmap = g_new0(BdrvDirtyBitmap, 1);
bitmap->mutex = &bs->dirty_bitmap_mutex;
- /*
- * TODO - let hbitmap track full granularity. For now, it is tracking
- * only sector granularity, as a shortcut for our iterators.
- */
- bitmap->bitmap = hbitmap_alloc(DIV_ROUND_UP(bitmap_size, BDRV_SECTOR_SIZE),
- ctz32(granularity) - BDRV_SECTOR_BITS);
+ bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(granularity));
bitmap->size = bitmap_size;
bitmap->name = g_strdup(name);
bitmap->disabled = false;
@@ -314,7 +309,7 @@ void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
assert(!bdrv_dirty_bitmap_frozen(bitmap));
assert(!bitmap->active_iterators);
- hbitmap_truncate(bitmap->bitmap, DIV_ROUND_UP(size, BDRV_SECTOR_SIZE));
+ hbitmap_truncate(bitmap->bitmap, size);
bitmap->size = size;
}
bdrv_dirty_bitmaps_unlock(bs);
@@ -444,7 +439,7 @@ bool bdrv_get_dirty_locked(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
int64_t offset)
{
if (bitmap) {
- return hbitmap_get(bitmap->bitmap, offset >> BDRV_SECTOR_BITS);
+ return hbitmap_get(bitmap->bitmap, offset);
} else {
return false;
}
@@ -472,7 +467,7 @@ uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs)
uint32_t bdrv_dirty_bitmap_granularity(const BdrvDirtyBitmap *bitmap)
{
- return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap);
+ return 1U << hbitmap_granularity(bitmap->bitmap);
}
BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap)
@@ -505,19 +500,16 @@ void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter)
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
{
- return hbitmap_iter_next(&iter->hbi) * BDRV_SECTOR_SIZE;
+ return hbitmap_iter_next(&iter->hbi);
}
/* Called within bdrv_dirty_bitmap_lock..unlock */
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t offset, int64_t bytes)
{
- int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
-
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_set(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
- end_sector - (offset >> BDRV_SECTOR_BITS));
+ hbitmap_set(bitmap->bitmap, offset, bytes);
}
void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
@@ -532,12 +524,9 @@ void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap,
void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
int64_t offset, int64_t bytes)
{
- int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
-
assert(bdrv_dirty_bitmap_enabled(bitmap));
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_reset(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
- end_sector - (offset >> BDRV_SECTOR_BITS));
+ hbitmap_reset(bitmap->bitmap, offset, bytes);
}
void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap,
@@ -557,8 +546,7 @@ void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out)
hbitmap_reset_all(bitmap->bitmap);
} else {
HBitmap *backup = bitmap->bitmap;
- bitmap->bitmap = hbitmap_alloc(DIV_ROUND_UP(bitmap->size,
- BDRV_SECTOR_SIZE),
+ bitmap->bitmap = hbitmap_alloc(bitmap->size,
hbitmap_granularity(backup));
*out = backup;
}
@@ -577,51 +565,40 @@ void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in)
uint64_t bdrv_dirty_bitmap_serialization_size(const BdrvDirtyBitmap *bitmap,
uint64_t offset, uint64_t bytes)
{
- assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
- return hbitmap_serialization_size(bitmap->bitmap,
- offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS);
+ return hbitmap_serialization_size(bitmap->bitmap, offset, bytes);
}
uint64_t bdrv_dirty_bitmap_serialization_align(const BdrvDirtyBitmap *bitmap)
{
- return hbitmap_serialization_align(bitmap->bitmap) * BDRV_SECTOR_SIZE;
+ return hbitmap_serialization_align(bitmap->bitmap);
}
void bdrv_dirty_bitmap_serialize_part(const BdrvDirtyBitmap *bitmap,
uint8_t *buf, uint64_t offset,
uint64_t bytes)
{
- assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
- hbitmap_serialize_part(bitmap->bitmap, buf, offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS);
+ hbitmap_serialize_part(bitmap->bitmap, buf, offset, bytes);
}
void bdrv_dirty_bitmap_deserialize_part(BdrvDirtyBitmap *bitmap,
uint8_t *buf, uint64_t offset,
uint64_t bytes, bool finish)
{
- assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
- hbitmap_deserialize_part(bitmap->bitmap, buf, offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS, finish);
+ hbitmap_deserialize_part(bitmap->bitmap, buf, offset, bytes, finish);
}
void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
uint64_t offset, uint64_t bytes,
bool finish)
{
- assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
- hbitmap_deserialize_zeroes(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS, finish);
+ hbitmap_deserialize_zeroes(bitmap->bitmap, offset, bytes, finish);
}
void bdrv_dirty_bitmap_deserialize_ones(BdrvDirtyBitmap *bitmap,
uint64_t offset, uint64_t bytes,
bool finish)
{
- assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
- hbitmap_deserialize_ones(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS, finish);
+ hbitmap_deserialize_ones(bitmap->bitmap, offset, bytes, finish);
}
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap)
@@ -632,7 +609,6 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap)
void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes)
{
BdrvDirtyBitmap *bitmap;
- int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
if (QLIST_EMPTY(&bs->dirty_bitmaps)) {
return;
@@ -644,8 +620,7 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes)
continue;
}
assert(!bdrv_dirty_bitmap_readonly(bitmap));
- hbitmap_set(bitmap->bitmap, offset >> BDRV_SECTOR_BITS,
- end_sector - (offset >> BDRV_SECTOR_BITS));
+ hbitmap_set(bitmap->bitmap, offset, bytes);
}
bdrv_dirty_bitmaps_unlock(bs);
}
@@ -655,12 +630,12 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes)
*/
void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t offset)
{
- hbitmap_iter_init(&iter->hbi, iter->hbi.hb, offset >> BDRV_SECTOR_BITS);
+ hbitmap_iter_init(&iter->hbi, iter->hbi.hb, offset);
}
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap)
{
- return hbitmap_count(bitmap->bitmap) << BDRV_SECTOR_BITS;
+ return hbitmap_count(bitmap->bitmap);
}
int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap)
--
2.9.4
^ permalink raw reply related [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() to byte-based iteration
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() " Eric Blake
@ 2017-07-13 11:03 ` Vladimir Sementsov-Ogievskiy
2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
0 siblings, 1 reply; 27+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-07-13 11:03 UTC (permalink / raw)
To: Eric Blake, qemu-devel; +Cc: kwolf, jsnow, qemu-block, Max Reitz
13.07.2017 04:05, Eric Blake wrote:
> Now that we have adjusted the majority of the calls this function
> makes to be byte-based, it is easier to read the code if it makes
> passes over the image using bytes rather than sectors.
>
> Signed-off-by: Eric Blake <eblake@redhat.com>
> Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com>
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() to byte-based iteration
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() " Eric Blake
@ 2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
0 siblings, 0 replies; 27+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-07-13 11:09 UTC (permalink / raw)
To: Eric Blake, qemu-devel; +Cc: kwolf, jsnow, qemu-block, Max Reitz
13.07.2017 04:05, Eric Blake wrote:
> Now that we have adjusted the majority of the calls this function
> makes to be byte-based, it is easier to read the code if it makes
> passes over the image using bytes rather than sectors.
>
> Signed-off-by: Eric Blake <eblake@redhat.com>
> Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() to byte-based iteration
2017-07-13 11:03 ` Vladimir Sementsov-Ogievskiy
@ 2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
0 siblings, 0 replies; 27+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2017-07-13 11:09 UTC (permalink / raw)
To: Eric Blake, qemu-devel; +Cc: kwolf, jsnow, qemu-block, Max Reitz
13.07.2017 14:03, Vladimir Sementsov-Ogievskiy wrote:
> 13.07.2017 04:05, Eric Blake wrote:
>> Now that we have adjusted the majority of the calls this function
>> makes to be byte-based, it is easier to read the code if it makes
>> passes over the image using bytes rather than sectors.
>>
>> Signed-off-by: Eric Blake<eblake@redhat.com>
>> Reviewed-by: John Snow<jsnow@redhat.com>
>
> Reviewed-by: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com>
> --
> Best regards,
> Vladimir
stolen whitespace here
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes Eric Blake
@ 2017-07-13 17:37 ` John Snow
0 siblings, 0 replies; 27+ messages in thread
From: John Snow @ 2017-07-13 17:37 UTC (permalink / raw)
To: Eric Blake, qemu-devel
Cc: kwolf, vsementsov, Fam Zheng, qemu-block, Max Reitz
On 07/12/2017 09:05 PM, Eric Blake wrote:
> We are still using an internal hbitmap that tracks a size in sectors,
> with the granularity scaled down accordingly, because it lets us
> use a shortcut for our iterators which are currently sector-based.
> But there's no reason we can't track the dirty bitmap size in bytes,
> since it is (mostly) an internal-only variable (remember, the size
> is how many bytes are covered by the bitmap, not how many bytes the
> bitmap occupies). Furthermore, we're already reporting bytes for
> bdrv_dirty_bitmap_granularity(); mixing bytes and sectors in our
> return values is a recipe for confusion. A later cleanup will
> convert dirty bitmap internals to be entirely byte-based,
> eliminating the intermediate sector rounding added here; and
> technically, since bdrv_getlength() already rounds up to sectors,
> our use of DIV_ROUND_UP is more for theoretical completeness than
> for any actual rounding.
>
> The only external caller in qcow2-bitmap.c is temporarily more verbose
> (because it is still using sector-based math), but will later be
> switched to track progress by bytes instead of sectors.
>
> Use is_power_of_2() while at it, instead of open-coding that, and
> add an assertion where bdrv_getlength() should not fail.
>
> Signed-off-by: Eric Blake <eblake@redhat.com>
>
Reviewed-by: John Snow <jsnow@redhat.com>
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration Eric Blake
@ 2017-07-13 18:34 ` John Snow
0 siblings, 0 replies; 27+ messages in thread
From: John Snow @ 2017-07-13 18:34 UTC (permalink / raw)
To: Eric Blake, qemu-devel
Cc: kwolf, vsementsov, qemu-block, Jeff Cody, Max Reitz
On 07/12/2017 09:05 PM, Eric Blake wrote:
> Now that we have adjusted the majority of the calls this function
> makes to be byte-based, it is easier to read the code if it makes
> passes over the image using bytes rather than sectors.
>
> Signed-off-by: Eric Blake <eblake@redhat.com>
>
Looks like we just pick up a touch more cleanup here.
Reviewed-by: John Snow <jsnow@redhat.com>
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() to byte-based iteration
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() " Eric Blake
@ 2017-07-13 18:49 ` John Snow
2017-07-14 16:48 ` Eric Blake
0 siblings, 1 reply; 27+ messages in thread
From: John Snow @ 2017-07-13 18:49 UTC (permalink / raw)
To: Eric Blake, qemu-devel; +Cc: kwolf, vsementsov, qemu-block, Max Reitz
On 07/12/2017 09:05 PM, Eric Blake wrote:
> This is new code, but it is easier to read if it makes passes over
> the image using bytes rather than sectors (and will get easier in
> the future when bdrv_get_block_status is converted to byte-based).
>
> While at it, fix a bug in the computation of nb_sectors using MAX
> rather than MIN and thus always passing INT_MAX (thankfully, the
> bug was harmless, as bdrv_get_block_status_above() clamps its
> answers according to image size).
>
Well, unless ssize was >= 2^40, and then it wouldn't have chosen
INT_MAX, right!?
> Signed-off-by: Eric Blake <eblake@redhat.com>
>
Reviewed-by: John Snow <jsnow@redhat.com>
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity Eric Blake
@ 2017-07-13 19:01 ` John Snow
0 siblings, 0 replies; 27+ messages in thread
From: John Snow @ 2017-07-13 19:01 UTC (permalink / raw)
To: Eric Blake, qemu-devel
Cc: kwolf, vsementsov, Fam Zheng, qemu-block, Max Reitz
On 07/12/2017 09:05 PM, Eric Blake wrote:
> Now that all callers are using byte-based interfaces, there's no
> reason for our internal hbitmap to remain with sector-based
> granularity. It also simplifies our internal scaling, since we
> already know that hbitmap widens requests out to granularity
> boundaries.
>
> Signed-off-by: Eric Blake <eblake@redhat.com>
>
> ---
> v5: fix bdrv_dirty_bitmap_truncate [John]
> v4: rebase to earlier changes, include serialization, R-b dropped
> v3: no change
> v2: no change
Reviewed-by: John Snow <jsnow@redhat.com>
^ permalink raw reply [flat|nested] 27+ messages in thread
* Re: [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() to byte-based iteration
2017-07-13 18:49 ` John Snow
@ 2017-07-14 16:48 ` Eric Blake
0 siblings, 0 replies; 27+ messages in thread
From: Eric Blake @ 2017-07-14 16:48 UTC (permalink / raw)
To: John Snow, qemu-devel; +Cc: kwolf, vsementsov, qemu-block, Max Reitz
[-- Attachment #1: Type: text/plain, Size: 1144 bytes --]
On 07/13/2017 01:49 PM, John Snow wrote:
>
>
> On 07/12/2017 09:05 PM, Eric Blake wrote:
>> This is new code, but it is easier to read if it makes passes over
>> the image using bytes rather than sectors (and will get easier in
>> the future when bdrv_get_block_status is converted to byte-based).
>>
>> While at it, fix a bug in the computation of nb_sectors using MAX
>> rather than MIN and thus always passing INT_MAX (thankfully, the
>> bug was harmless, as bdrv_get_block_status_above() clamps its
>> answers according to image size).
>>
>
> Well, unless ssize was >= 2^40, and then it wouldn't have chosen
> INT_MAX, right!?
But then it would have wrapped the value around while assigning it to
'int nb_sectors'. I suppose for some very-interesting size images, you
could get nb_sectors to turn into a negative value? At any rate, it's
good the bug was short-lived.
>
>> Signed-off-by: Eric Blake <eblake@redhat.com>
>>
>
> Reviewed-by: John Snow <jsnow@redhat.com>
>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 604 bytes --]
^ permalink raw reply [flat|nested] 27+ messages in thread
end of thread, other threads:[~2017-07-14 16:48 UTC | newest]
Thread overview: 27+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-07-13 1:05 [Qemu-devel] [PATCH v5 00/18] make dirty-bitmap byte-based Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 01/18] dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 02/18] hbitmap: Rename serialization_granularity to serialization_align Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 03/18] qcow2: Ensure bitmap serialization is aligned Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 04/18] dirty-bitmap: Drop unused functions Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 05/18] dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes Eric Blake
2017-07-13 17:37 ` John Snow
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 06/18] dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 07/18] qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 08/18] dirty-bitmap: Set iterator start by offset, not sector Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 09/18] dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 10/18] dirty-bitmap: Change bdrv_get_dirty_count() to report bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 11/18] dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 12/18] dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 13/18] mirror: Switch mirror_dirty_init() to byte-based iteration Eric Blake
2017-07-13 18:34 ` John Snow
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 14/18] qcow2: Switch qcow2_measure() " Eric Blake
2017-07-13 18:49 ` John Snow
2017-07-14 16:48 ` Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 15/18] qcow2: Switch load_bitmap_data() " Eric Blake
2017-07-13 11:03 ` Vladimir Sementsov-Ogievskiy
2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 16/18] qcow2: Switch store_bitmap_data() " Eric Blake
2017-07-13 11:09 ` Vladimir Sementsov-Ogievskiy
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 17/18] dirty-bitmap: Switch bdrv_set_dirty() to bytes Eric Blake
2017-07-13 1:05 ` [Qemu-devel] [PATCH v5 18/18] dirty-bitmap: Convert internal hbitmap size/granularity Eric Blake
2017-07-13 19:01 ` John Snow
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