* [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
@ 2016-02-17 15:28 Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 01/17] hbitmap: load/store Vladimir Sementsov-Ogievskiy
` (19 more replies)
0 siblings, 20 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
This series add persistent dirty bitmaps feature to qcow2.
Specification is in docs/spec/qcow2.txt (not merged yet, see
[PATCH v10] spec: add qcow2 bitmaps extension specification)
This series are based on Fam's
[PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
(meta bitmaps not used, and only hbitmap_deserialize_finish from
serialization)
This also needs some preparation patches, most of them are in my
bitmap-migration series. I've not listed them here to keep things
simpler, this is RFC any way.
v4:
Previous version was posted more than five months ago, so I will not
carefully list all changes.
What should be noted:
- some changes are made to sutisfy last version of specification
- removed staff, related to possibility of saving bitmaps for one
disk in the other qcow2.
- to make bitmap store/load zero-copy, I've moved load/store code to
HBitmap - this is new patch 01.
so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
only hbitmap_deserialize_finish, to repair bitmap consistency after
loading its last level.
- two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
- some fixes made after John's comments on v3
Vladimir Sementsov-Ogievskiy (17):
hbitmap: load/store
qcow2: Bitmaps extension: structs and consts
qcow2-dirty-bitmap: read dirty bitmap directory
qcow2-dirty-bitmap: add qcow2_bitmap_load()
qcow2-dirty-bitmap: add qcow2_bitmap_store()
qcow2: add dirty bitmaps extension
qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
block: store persistent dirty bitmaps
block: add bdrv_load_dirty_bitmap()
qcow2-dirty-bitmap: add autoclear bit
qemu: command line option for dirty bitmaps
qcow2-dirty-bitmap: add IN_USE flag
qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
iotests: add VM.test_launcn()
iotests: test internal persistent dirty bitmap
qcow2-dirty-bitmap: add AUTO flag
qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
block.c | 3 +
block/Makefile.objs | 2 +-
block/dirty-bitmap.c | 101 +++++
block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
block/qcow2.c | 105 +++++-
block/qcow2.h | 59 +++
blockdev.c | 36 ++
include/block/block_int.h | 9 +
include/block/dirty-bitmap.h | 21 ++
include/qemu/hbitmap.h | 12 +
include/sysemu/blockdev.h | 1 +
include/sysemu/sysemu.h | 1 +
qemu-options.hx | 35 ++
tests/qemu-iotests/160 | 112 ++++++
tests/qemu-iotests/160.out | 21 ++
tests/qemu-iotests/group | 1 +
tests/qemu-iotests/iotests.py | 25 ++
util/hbitmap.c | 182 +++++++++
vl.c | 78 ++++
19 files changed, 1640 insertions(+), 3 deletions(-)
create mode 100644 block/qcow2-dirty-bitmap.c
create mode 100755 tests/qemu-iotests/160
create mode 100644 tests/qemu-iotests/160.out
--
1.8.3.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 01/17] hbitmap: load/store
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 02/17] qcow2: Bitmaps extension: structs and consts Vladimir Sementsov-Ogievskiy
` (18 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Add functions for load/store HBitmap to BDS, using clusters table:
Last level of the bitmap is splitted into chunks of 'cluster_size'
size. Each cell of the table contains offset in bds, to load/store
corresponding chunk.
Also,
0 in cell means all-zeroes-chunk (should not be saved)
1 in cell means all-ones-chunk (should not be saved)
hbitmap_prepare_store() fills table with
0 for all-zeroes chunks
1 for all-ones chunks
2 for others
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/dirty-bitmap.c | 23 ++++++
include/block/dirty-bitmap.h | 11 +++
include/qemu/hbitmap.h | 12 +++
util/hbitmap.c | 182 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 228 insertions(+)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 0733897..982f930 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -491,3 +491,26 @@ int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap)
{
return hbitmap_count(bitmap->bitmap);
}
+
+int bdrv_dirty_bitmap_load(BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size)
+{
+ return hbitmap_load(bitmap->bitmap, bs, table, table_size, cluster_size);
+}
+
+int bdrv_dirty_bitmap_prepare_store(const BdrvDirtyBitmap *bitmap,
+ uint32_t cluster_size,
+ uint64_t *table,
+ uint32_t *table_size)
+{
+ return hbitmap_prepare_store(bitmap->bitmap, cluster_size,
+ table, table_size);
+}
+
+int bdrv_dirty_bitmap_store(const BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size)
+{
+ return hbitmap_store(bitmap->bitmap, bs, table, table_size, cluster_size);
+}
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index a622e3f..1e16a5f 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -68,4 +68,15 @@ void bdrv_dirty_bitmap_deserialize_zeroes(BdrvDirtyBitmap *bitmap,
bool finish);
void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
+int bdrv_dirty_bitmap_load(BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size);
+int bdrv_dirty_bitmap_prepare_store(const BdrvDirtyBitmap *bitmap,
+ uint32_t cluster_size,
+ uint64_t *table,
+ uint32_t *table_size);
+int bdrv_dirty_bitmap_store(const BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size);
+
#endif
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index 6a57902..8c539cb 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -339,5 +339,17 @@ static inline size_t hbitmap_iter_next_word(HBitmapIter *hbi, unsigned long *p_c
return hbi->pos;
}
+typedef struct BlockDriverState BlockDriverState;
+
+int hbitmap_load(HBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size);
+
+int hbitmap_prepare_store(const HBitmap *bitmap, uint32_t cluster_size,
+ uint64_t *table, uint32_t *table_size);
+
+int hbitmap_store(HBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size);
#endif
diff --git a/util/hbitmap.c b/util/hbitmap.c
index caf4af6..ea2c4d2 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -17,6 +17,8 @@
#include "qemu/host-utils.h"
#include "trace.h"
+#include "block/block.h"
+
/* HBitmaps provides an array of bits. The bits are stored as usual in an
* array of unsigned longs, but HBitmap is also optimized to provide fast
* iteration over set bits; going from one bit to the next is O(logB n)
@@ -672,3 +674,183 @@ char *hbitmap_md5(const HBitmap *bitmap)
const guchar *data = (const guchar *)bitmap->levels[HBITMAP_LEVELS - 1];
return g_compute_checksum_for_data(G_CHECKSUM_MD5, data, size);
}
+
+/* load_bitmap()
+ * Load dirty bitmap from file, using table with cluster offsets.
+ * Table entries are assumed to be in little endian format.
+ */
+int hbitmap_load(HBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size)
+{
+ uint32_t i;
+ uint8_t *cur = (uint8_t *)bitmap->levels[HBITMAP_LEVELS - 1];
+ uint8_t *end = cur + ((bitmap->size + 7) >> 3);
+
+ hbitmap_reset_all(bitmap);
+
+ for (i = 0; i < table_size && cur < end; ++i) {
+ uint64_t offset = table[i];
+ uint64_t count = MIN(cluster_size, end - cur);
+
+ /* Zero offset means zero region, offset = 1 means filled region.
+ * Cluster is not allocated in both cases. */
+ if (offset == 1) {
+ memset(cur, 0xff, count);
+ } else if (offset) {
+ int ret = bdrv_pread(bs, offset, cur, count);
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
+ cur += cluster_size;
+ }
+
+ cur = (uint8_t *)bitmap->levels[HBITMAP_LEVELS - 1];
+ while (cur < end) {
+ if (BITS_PER_LONG == 32) {
+ le32_to_cpus((uint32_t *)cur);
+ } else {
+ le64_to_cpus((uint64_t *)cur);
+ }
+
+ cur += sizeof(unsigned long);
+ }
+
+ hbitmap_deserialize_finish(bitmap);
+
+ return 0;
+}
+
+static bool buffer_is_all_ones(void *buf, size_t len)
+{
+ /* FIXME */
+ return false;
+}
+
+/* hbitmap_prepare_store()
+ * Devide bitmap data into clusters, and then,
+ * for zero cluster: table[i] = 0
+ * for all-ones cluster: table[i] = 1
+ * for other clusters: table[i] = 2
+ */
+int hbitmap_prepare_store(const HBitmap *bitmap,
+ uint32_t cluster_size,
+ uint64_t *table,
+ uint32_t *table_size)
+{
+ HBitmapIter hbi;
+ hbitmap_iter_init(&hbi, bitmap, 0);
+ uint64_t nb_bits_in_cl = (uint64_t)cluster_size << 3;
+ uint32_t need_table_size =
+ (bitmap->size + nb_bits_in_cl - 1) / nb_bits_in_cl;
+
+ if (table == NULL && *table_size == 0) {
+ *table_size = need_table_size;
+ return 0;
+ }
+
+ if (*table_size < need_table_size) {
+ return -ENOMEM;
+ }
+
+ memset(table, 0, *table_size * sizeof(table[0]));
+
+ for (;;) {
+ unsigned long cur;
+ size_t pos = hbitmap_iter_next_word(&hbi, &cur);
+ size_t byte = pos * sizeof(unsigned long);
+ uint64_t bit = byte << 3;
+ uint64_t nbits = MIN(cluster_size << 3, bitmap->size - bit), next_bit;
+ size_t i = byte / cluster_size;
+
+ if (pos == -1) {
+ break;
+ }
+
+ if (pos % cluster_size != 0) {
+ table[i] = 2;
+ } else if (buffer_is_all_ones(&bitmap->levels[HBITMAP_LEVELS - 1][pos],
+ nbits >> 3)) {
+ table[i] = 1;
+ if (nbits & 7) {
+ uint8_t last_byte =
+ *(((uint8_t *)&bitmap->levels[HBITMAP_LEVELS - 1][pos])
+ + (nbits >> 3));
+ if (last_byte != ((1 << (nbits & 7)) - 1)) {
+ table[i] = 2;
+ }
+ }
+ } else {
+ table[i] = 2;
+ }
+
+ next_bit = (i + 1) * cluster_size << 3;
+
+ if (next_bit >= bitmap->size) {
+ break;
+ }
+
+ hbitmap_iter_init(&hbi, bitmap, next_bit << bitmap->granularity);
+ }
+
+ return 0;
+}
+
+static void longs_to_le(unsigned long *longs, size_t count)
+{
+ unsigned long *end = longs + count;
+ while (longs < end) {
+ if (BITS_PER_LONG == 32) {
+ cpu_to_le32s((uint32_t *)longs);
+ } else {
+ cpu_to_le64s((uint64_t *)longs);
+ }
+
+ longs++;
+ }
+}
+
+/* store_bitmap()
+ * update bitmap table by storing bitmap to it.
+ * bitmap table entries are assumed to be in big endian format
+ * On the error, the resulting bitmap table is valid for clearing, but
+ * may contain invalid bitmap */
+int hbitmap_store(HBitmap *bitmap, BlockDriverState *bs,
+ const uint64_t *table, uint32_t table_size,
+ uint32_t cluster_size)
+{
+ int i;
+ uint8_t *cur = (uint8_t *)bitmap->levels[HBITMAP_LEVELS - 1];
+ uint8_t *end = cur +
+ ((bitmap->size + BITS_PER_LONG - 1) >> BITS_PER_LEVEL) * (sizeof(long));
+
+ for (i = 0; i < table_size && cur < end; ++i) {
+ uint64_t offset = table[i];
+ uint64_t count = MIN(cluster_size, end - cur);
+
+ /* Zero offset means zero region, offset = 1 means filled region.
+ * Cluster is not allocated in both cases. */
+ if (offset > 1) {
+ int ret;
+ if (cpu_to_le16(1) == 1) {
+ ret = bdrv_pwrite(bs, offset, cur, count);
+ } else {
+ void *tmp = g_memdup(cur, count);
+ longs_to_le((unsigned long *)cur,
+ count / sizeof(unsigned long));
+ ret = bdrv_pwrite(bs, offset, tmp, count);
+ g_free(tmp);
+ }
+
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
+ cur += cluster_size;
+ }
+
+ return 0;
+}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 02/17] qcow2: Bitmaps extension: structs and consts
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 01/17] hbitmap: load/store Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 03/17] qcow2-dirty-bitmap: read dirty bitmap directory Vladimir Sementsov-Ogievskiy
` (17 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Add data structures and constraints accordingly to docs/specs/qcow2.txt
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/Makefile.objs | 2 +-
block/qcow2-dirty-bitmap.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.h | 34 +++++++++++++++++++++++++++++++++
3 files changed, 82 insertions(+), 1 deletion(-)
create mode 100644 block/qcow2-dirty-bitmap.c
diff --git a/block/Makefile.objs b/block/Makefile.objs
index cdd8655..c4dcf7c 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -1,5 +1,5 @@
block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o
-block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
+block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-dirty-bitmap.o
block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
block-obj-y += qed-check.o
block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
new file mode 100644
index 0000000..2c749ab
--- /dev/null
+++ b/block/qcow2-dirty-bitmap.c
@@ -0,0 +1,47 @@
+/*
+ * Bitmaps for the QCOW version 2 format
+ *
+ * Copyright (c) 2014-2015 Vladimir Sementsov-Ogievskiy
+ *
+ * This file is derived from qcow2-snapshot.c, original copyright:
+ * Copyright (c) 2004-2006 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* NOTICE: BME here means Bitmaps Extension and used as a namespace for
+ * _internal_ constants. Please do not use this _internal_ abbreviation for
+ * other needs and/or outside of this file. */
+
+/* Bitmap directory entry constraints */
+#define BME_MAX_TABLE_SIZE 0x8000000
+#define BME_MAX_PHYS_SIZE 0x20000000 /* 512 mb */
+#define BME_MAX_GRANULARITY_BITS 31
+#define BME_MIN_GRANULARITY_BITS 9
+#define BME_MAX_NAME_SIZE 1023
+
+/* Bitmap directory entry flags */
+#define BME_RESERVED_FLAGS 0xffffffff
+
+/* bits [1, 8] U [56, 63] are reserved */
+#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
+
+typedef enum BitmapType {
+ BT_DIRTY_TRACKING_BITMAP = 1
+} BitmapType;
diff --git a/block/qcow2.h b/block/qcow2.h
index a063a3c..3f7429e 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -52,6 +52,10 @@
* space for snapshot names and IDs */
#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
+/* Bitmap header extension constraints */
+#define QCOW_MAX_DIRTY_BITMAPS 65535
+#define QCOW_MAX_DIRTY_BITMAP_DIRECTORY_SIZE (1024 * QCOW_MAX_DIRTY_BITMAPS)
+
/* indicate that the refcount of the referenced cluster is exactly one. */
#define QCOW_OFLAG_COPIED (1ULL << 63)
/* indicate that the cluster is compressed (they never have the copied flag) */
@@ -142,6 +146,22 @@ typedef struct QEMU_PACKED QCowSnapshotHeader {
/* name follows */
} QCowSnapshotHeader;
+/* QCow2BitmapHeader is actually a bitmap directory entry */
+typedef struct QEMU_PACKED QCow2BitmapHeader {
+ /* header is 8 byte aligned */
+ uint64_t bitmap_table_offset;
+
+ uint32_t bitmap_table_size;
+ uint32_t flags;
+
+ uint8_t type;
+ uint8_t granularity_bits;
+ uint16_t name_size;
+ uint32_t extra_data_size;
+ /* extra data follows */
+ /* name follows */
+} QCow2BitmapHeader;
+
typedef struct QEMU_PACKED QCowSnapshotExtraData {
uint64_t vm_state_size_large;
uint64_t disk_size;
@@ -160,6 +180,11 @@ typedef struct QCowSnapshot {
uint64_t vm_clock_nsec;
} QCowSnapshot;
+typedef struct QCow2Bitmap {
+ uint64_t offset;
+ char *name;
+} QCow2Bitmap;
+
struct Qcow2Cache;
typedef struct Qcow2Cache Qcow2Cache;
@@ -222,6 +247,15 @@ typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
typedef void Qcow2SetRefcountFunc(void *refcount_array,
uint64_t index, uint64_t value);
+/* Be careful, Qcow2BitmapHeaderExt is not an extension of QCow2BitmapHeader, it
+ * is Qcow2 header extension */
+typedef struct Qcow2BitmapHeaderExt {
+ uint32_t nb_bitmaps;
+ uint32_t reserved32;
+ uint64_t bitmap_directory_size;
+ uint64_t bitmap_directory_offset;
+} QEMU_PACKED Qcow2BitmapHeaderExt;
+
typedef struct BDRVQcow2State {
int cluster_bits;
int cluster_size;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 03/17] qcow2-dirty-bitmap: read dirty bitmap directory
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 01/17] hbitmap: load/store Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 02/17] qcow2: Bitmaps extension: structs and consts Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 04/17] qcow2-dirty-bitmap: add qcow2_bitmap_load() Vladimir Sementsov-Ogievskiy
` (16 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Adds qcow2_read_bitmaps, reading bitmap directory as
specified in docs/specs/qcow2.txt
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 163 +++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.h | 10 +++
2 files changed, 173 insertions(+)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 2c749ab..2e87acf 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -25,6 +25,9 @@
* THE SOFTWARE.
*/
+#include "block/block_int.h"
+#include "block/qcow2.h"
+
/* NOTICE: BME here means Bitmaps Extension and used as a namespace for
* _internal_ constants. Please do not use this _internal_ abbreviation for
* other needs and/or outside of this file. */
@@ -45,3 +48,163 @@
typedef enum BitmapType {
BT_DIRTY_TRACKING_BITMAP = 1
} BitmapType;
+
+void qcow2_free_bitmaps(BlockDriverState *bs)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int i;
+
+ for (i = 0; i < s->nb_bitmaps; i++) {
+ g_free(s->bitmaps[i].name);
+ }
+ g_free(s->bitmaps);
+ s->bitmaps = NULL;
+ s->nb_bitmaps = 0;
+
+ g_free(s->bitmap_directory);
+ s->bitmap_directory = NULL;
+}
+
+static void bitmap_header_to_cpu(QCow2BitmapHeader *h)
+{
+ be64_to_cpus(&h->bitmap_table_offset);
+ be32_to_cpus(&h->bitmap_table_size);
+ be32_to_cpus(&h->flags);
+ be16_to_cpus(&h->name_size);
+ be32_to_cpus(&h->extra_data_size);
+}
+
+static int calc_dir_entry_size(size_t name_size)
+{
+ return align_offset(sizeof(QCow2BitmapHeader) + name_size, 8);
+}
+
+static int dir_entry_size(QCow2BitmapHeader *h)
+{
+ return calc_dir_entry_size(h->name_size);
+}
+
+static int check_constraints(QCow2BitmapHeader *h, int cluster_size,
+ uint64_t disk_size)
+{
+ uint64_t phys_bitmap_bytes =
+ (uint64_t)h->bitmap_table_size * cluster_size;
+ uint64_t max_virtual_bits = (phys_bitmap_bytes * 8) << h->granularity_bits;
+
+ int fail =
+ (h->bitmap_table_offset % cluster_size) ||
+ (h->bitmap_table_size > BME_MAX_TABLE_SIZE) ||
+ (phys_bitmap_bytes > BME_MAX_PHYS_SIZE) ||
+ (disk_size > max_virtual_bits) ||
+ (h->granularity_bits > BME_MAX_GRANULARITY_BITS) ||
+ (h->granularity_bits < BME_MIN_GRANULARITY_BITS) ||
+ (h->flags & BME_RESERVED_FLAGS) ||
+ (h->name_size > BME_MAX_NAME_SIZE) ||
+ (h->type != BT_DIRTY_TRACKING_BITMAP);
+
+ return fail ? -EINVAL : 0;
+}
+
+static int directory_read(BlockDriverState *bs, Error **errp)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+ QCow2Bitmap *bm, *end;
+ int64_t nb_sectors = bdrv_nb_sectors(bs);
+ size_t offset;
+
+ if (nb_sectors < 0) {
+ error_setg(errp, "Can't calculate number of disk sectors.");
+ return nb_sectors;
+ }
+
+ if (s->bitmap_directory != NULL) {
+ /* already read */
+ error_setg(errp, "Try read bitmaps, when they are already read.");
+ return -EEXIST;
+ }
+
+ s->bitmap_directory = g_try_malloc0(s->bitmap_directory_size);
+ if (s->bitmap_directory == NULL) {
+ error_setg(errp, "Can't allocate space for bitmap directory.");
+ return -ENOMEM;
+ }
+
+ ret = bdrv_pread(bs->file->bs,
+ s->bitmap_directory_offset,
+ s->bitmap_directory,
+ s->bitmap_directory_size);
+ if (ret < 0) {
+ error_setg(errp, "Can't read bitmap directory.");
+ goto fail;
+ }
+
+ offset = 0;
+ end = s->bitmaps + s->nb_bitmaps;
+ for (bm = s->bitmaps; bm < end; ++bm) {
+ QCow2BitmapHeader *h =
+ (QCow2BitmapHeader *)(s->bitmap_directory + offset);
+
+ if (offset >= s->bitmap_directory_size) {
+ error_setg(errp, "Broken bitmap directory.");
+ goto fail;
+ }
+
+ bitmap_header_to_cpu(h);
+
+ ret = check_constraints(h, s->cluster_size,
+ nb_sectors << BDRV_SECTOR_BITS);
+ if (ret < 0) {
+ error_setg(errp, "Bitmap doesn't satisfy the constraints.");
+ goto fail;
+ }
+
+ bm->offset = offset;
+ bm->name = g_strndup((char *)(h + 1), h->name_size);
+
+ offset += dir_entry_size(h);
+ }
+ return 0;
+
+fail:
+ g_free(s->bitmap_directory);
+ s->bitmap_directory = NULL;
+
+ return ret;
+}
+
+int qcow2_read_bitmaps(BlockDriverState *bs, Error **errp)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+
+ if (s->bitmap_directory != NULL || s->bitmaps != NULL) {
+ /* already read */
+ error_setg(errp, "Try read bitmaps, when they are already read.");
+ return -EEXIST;
+ }
+
+ if (s->nb_bitmaps == 0) {
+ /* No bitmaps - nothing to do */
+ return 0;
+ }
+
+ s->bitmaps = g_try_new0(QCow2Bitmap, s->nb_bitmaps);
+ if (s->bitmaps == NULL) {
+ error_setg(errp, "Can't allocate space for qcow2 bitmaps.");
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ret = directory_read(bs, errp);
+ if (ret < 0) {
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ qcow2_free_bitmaps(bs);
+
+ return ret;
+}
diff --git a/block/qcow2.h b/block/qcow2.h
index 3f7429e..48fb2a5 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -297,6 +297,12 @@ typedef struct BDRVQcow2State {
unsigned int nb_snapshots;
QCowSnapshot *snapshots;
+ uint64_t bitmap_directory_offset;
+ uint64_t bitmap_directory_size;
+ uint8_t *bitmap_directory;
+ unsigned int nb_bitmaps;
+ QCow2Bitmap *bitmaps;
+
int flags;
int qcow_version;
bool use_lazy_refcounts;
@@ -610,6 +616,10 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs,
void qcow2_free_snapshots(BlockDriverState *bs);
int qcow2_read_snapshots(BlockDriverState *bs);
+/* qcow2-dirty-bitmap.c functions */
+void qcow2_free_bitmaps(BlockDriverState *bs);
+int qcow2_read_bitmaps(BlockDriverState *bs, Error **errp);
+
/* qcow2-cache.c functions */
Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 04/17] qcow2-dirty-bitmap: add qcow2_bitmap_load()
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (2 preceding siblings ...)
2016-02-17 15:28 ` [Qemu-devel] [PATCH 03/17] qcow2-dirty-bitmap: read dirty bitmap directory Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 05/17] qcow2-dirty-bitmap: add qcow2_bitmap_store() Vladimir Sementsov-Ogievskiy
` (15 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
This function loads block dirty bitmap from qcow2.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 110 +++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.c | 2 +
block/qcow2.h | 3 ++
include/block/block_int.h | 4 ++
4 files changed, 119 insertions(+)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 2e87acf..5e38a3d 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -105,6 +105,13 @@ static int check_constraints(QCow2BitmapHeader *h, int cluster_size,
return fail ? -EINVAL : 0;
}
+static QCow2BitmapHeader *bitmap_header(BDRVQcow2State *s,
+ QCow2Bitmap *bitmap)
+{
+ return (QCow2BitmapHeader *)
+ (s->bitmap_directory + bitmap->offset);
+}
+
static int directory_read(BlockDriverState *bs, Error **errp)
{
int ret;
@@ -208,3 +215,106 @@ fail:
return ret;
}
+
+static QCow2Bitmap *find_bitmap_by_name(BlockDriverState *bs, const char *name)
+{
+ BDRVQcow2State *s = bs->opaque;
+ QCow2Bitmap *bm, *end = s->bitmaps + s->nb_bitmaps;
+
+ for (bm = s->bitmaps; bm < end; ++bm) {
+ if (strcmp(bm->name, name) == 0) {
+ return bm;
+ }
+ }
+
+ return NULL;
+}
+
+/* load_bitmap_data()
+ * load dirty bitmap from bitmap table
+ * Bitmap table entries are assumed to be in big endian format */
+static int load_bitmap_data(BlockDriverState *bs, const uint64_t *bitmap_table,
+ uint32_t bitmap_table_size, BdrvDirtyBitmap *bitmap)
+{
+ int ret = 0;
+ BDRVQcow2State *s = bs->opaque;
+ uint32_t i;
+ uint64_t *tab = g_memdup(bitmap_table,
+ bitmap_table_size * sizeof(uint64_t));
+
+ for (i = 0; i < bitmap_table_size; ++i) {
+ be64_to_cpus(tab + i);
+ }
+
+ ret = bdrv_dirty_bitmap_load(bitmap, bs->file->bs, tab, bitmap_table_size,
+ s->cluster_size);
+
+ g_free(tab);
+
+ return ret;
+}
+
+static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
+ Error **errp)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+ QCow2BitmapHeader *bmh;
+ uint64_t *bitmap_table = NULL;
+ uint32_t granularity;
+ BdrvDirtyBitmap *bitmap = NULL;
+
+ bmh = bitmap_header(s, bm);
+
+ bitmap_table = g_try_malloc(bmh->bitmap_table_size * sizeof(uint64_t));
+ if (bitmap_table == NULL) {
+ error_setg_errno(errp, -ENOMEM,
+ "Could not allocate bitmap table");
+ return NULL;
+ }
+
+ ret = bdrv_pread(bs->file->bs, bmh->bitmap_table_offset,
+ bitmap_table,
+ bmh->bitmap_table_size * sizeof(uint64_t));
+ if (ret < 0) {
+ error_setg_errno(errp, -ret,
+ "Could not read bitmap_table table from image");
+ goto fail;
+ }
+
+ granularity = 1U << bmh->granularity_bits;
+ bitmap = bdrv_create_dirty_bitmap(bs, granularity, bm->name, errp);
+ if (bitmap == NULL) {
+ goto fail;
+ }
+
+ ret = load_bitmap_data(bs, bitmap_table, bmh->bitmap_table_size, bitmap);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Could not read bitmap from image");
+ goto fail;
+ }
+
+ g_free(bitmap_table);
+ return bitmap;
+
+fail:
+ g_free(bitmap_table);
+ bdrv_release_dirty_bitmap(bs, bitmap);
+
+ return NULL;
+}
+
+BdrvDirtyBitmap *qcow2_bitmap_load(BlockDriverState *bs, const char *name,
+ Error **errp)
+{
+ QCow2Bitmap *bm;
+
+ bm = find_bitmap_by_name(bs, name);
+ if (bm == NULL) {
+ error_setg(errp, "Could not find bitmap '%s' in the node '%s'", name,
+ bdrv_get_device_or_node_name(bs));
+ return NULL;
+ }
+
+ return load_bitmap(bs, bm, errp);
+}
diff --git a/block/qcow2.c b/block/qcow2.c
index fd8436c..fe53338 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3346,6 +3346,8 @@ BlockDriver bdrv_qcow2 = {
.bdrv_get_info = qcow2_get_info,
.bdrv_get_specific_info = qcow2_get_specific_info,
+ .bdrv_dirty_bitmap_load = qcow2_bitmap_load,
+
.bdrv_save_vmstate = qcow2_save_vmstate,
.bdrv_load_vmstate = qcow2_load_vmstate,
diff --git a/block/qcow2.h b/block/qcow2.h
index 48fb2a5..cc4c776 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -620,6 +620,9 @@ int qcow2_read_snapshots(BlockDriverState *bs);
void qcow2_free_bitmaps(BlockDriverState *bs);
int qcow2_read_bitmaps(BlockDriverState *bs, Error **errp);
+BdrvDirtyBitmap *qcow2_bitmap_load(BlockDriverState *bs, const char *name,
+ Error **errp);
+
/* qcow2-cache.c functions */
Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 428fa33..7c0290e 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -214,6 +214,10 @@ struct BlockDriver {
int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
+ BdrvDirtyBitmap *(*bdrv_dirty_bitmap_load)(BlockDriverState *bs,
+ const char *name,
+ Error **errp);
+
int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos);
int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 05/17] qcow2-dirty-bitmap: add qcow2_bitmap_store()
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (3 preceding siblings ...)
2016-02-17 15:28 ` [Qemu-devel] [PATCH 04/17] qcow2-dirty-bitmap: add qcow2_bitmap_load() Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 06/17] qcow2: add dirty bitmaps extension Vladimir Sementsov-Ogievskiy
` (14 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
This function stores block dirty bitmap to qcow2. If the bitmap with
the same name, size and granularity already exists, it will be
rewritten, if the bitmap with the same name exists but granularity or
size does not match, an error will be genrated.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 443 +++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.c | 1 +
block/qcow2.h | 2 +
include/block/block_int.h | 3 +
4 files changed, 449 insertions(+)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 5e38a3d..979e17e 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -74,6 +74,15 @@ static void bitmap_header_to_cpu(QCow2BitmapHeader *h)
be32_to_cpus(&h->extra_data_size);
}
+static void bitmap_header_to_be(QCow2BitmapHeader *h)
+{
+ cpu_to_be64s(&h->bitmap_table_offset);
+ cpu_to_be32s(&h->bitmap_table_size);
+ cpu_to_be32s(&h->flags);
+ cpu_to_be16s(&h->name_size);
+ cpu_to_be32s(&h->extra_data_size);
+}
+
static int calc_dir_entry_size(size_t name_size)
{
return align_offset(sizeof(QCow2BitmapHeader) + name_size, 8);
@@ -84,6 +93,17 @@ static int dir_entry_size(QCow2BitmapHeader *h)
return calc_dir_entry_size(h->name_size);
}
+static void directory_to_be(uint8_t *dir, size_t size)
+{
+ uint8_t *end = dir + size;
+ while (dir < end) {
+ QCow2BitmapHeader *h = (QCow2BitmapHeader *)dir;
+ dir += dir_entry_size(h);
+
+ bitmap_header_to_be(h);
+ }
+}
+
static int check_constraints(QCow2BitmapHeader *h, int cluster_size,
uint64_t disk_size)
{
@@ -318,3 +338,426 @@ BdrvDirtyBitmap *qcow2_bitmap_load(BlockDriverState *bs, const char *name,
return load_bitmap(bs, bm, errp);
}
+
+static int update_header_sync(BlockDriverState *bs)
+{
+ int ret;
+
+ ret = qcow2_update_header(bs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ ret = bdrv_flush(bs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return 0;
+}
+
+/* write bitmap directory from the state to new allocated clusters */
+static int64_t directory_write(BlockDriverState *bs, const uint8_t *dir,
+ size_t size)
+{
+ int ret = 0;
+ uint8_t *dir_be = NULL;
+ int64_t dir_offset = 0;
+
+ dir_be = g_try_malloc(size);
+ if (dir_be == NULL) {
+ return -ENOMEM;
+ }
+ memcpy(dir_be, dir, size);
+ directory_to_be(dir_be, size);
+
+ /* Allocate space for the new bitmap directory */
+ dir_offset = qcow2_alloc_clusters(bs, size);
+ if (dir_offset < 0) {
+ ret = dir_offset;
+ goto out;
+ }
+
+ /* The bitmap directory position has not yet been updated, so these
+ * clusters must indeed be completely free */
+ ret = qcow2_pre_write_overlap_check(bs, 0, dir_offset, size);
+ if (ret < 0) {
+ goto out;
+ }
+
+ ret = bdrv_pwrite(bs->file->bs, dir_offset, dir_be, size);
+ if (ret < 0) {
+ goto out;
+ }
+
+out:
+ g_free(dir_be);
+
+ if (ret < 0) {
+ if (dir_offset > 0) {
+ qcow2_free_clusters(bs, dir_offset, size, QCOW2_DISCARD_ALWAYS);
+ }
+
+ return ret;
+ }
+
+ return dir_offset;
+}
+
+static int directory_push_entry(BlockDriverState *bs, QCow2BitmapHeader *header)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+ int entry_size = dir_entry_size(header);
+ int64_t new_offset = 0, old_offset = 0;
+ uint64_t new_size = s->bitmap_directory_size + entry_size, old_size = 0;
+ void *p;
+ int64_t nb_sectors = bdrv_nb_sectors(bs);
+
+ if (nb_sectors < 0) {
+ return nb_sectors;
+ }
+
+ if (new_size > QCOW_MAX_DIRTY_BITMAP_DIRECTORY_SIZE) {
+ return -EINVAL;
+ }
+
+ ret = check_constraints(header, s->cluster_size,
+ nb_sectors << BDRV_SECTOR_BITS);
+ if (ret < 0) {
+ return -EINVAL;
+ }
+
+ old_offset = s->bitmap_directory_offset;
+ old_size = s->bitmap_directory_size;
+
+ uint8_t *new_dir = g_try_malloc(new_size);
+ if (new_dir == NULL) {
+ return -ENOMEM;
+ }
+ memcpy(new_dir, s->bitmap_directory, s->bitmap_directory_size);
+ memcpy(new_dir + s->bitmap_directory_size, header, entry_size);
+
+ new_offset = directory_write(bs, new_dir, new_size);
+ if (new_offset < 0) {
+ ret = new_offset;
+ goto fail;
+ }
+
+ ret = bdrv_flush(bs);
+ if (ret < 0) {
+ goto fail;
+ }
+
+ s->bitmap_directory_offset = new_offset;
+ s->bitmap_directory_size = new_size;
+
+ ret = update_header_sync(bs);
+ if (ret < 0) {
+ goto fail;
+ }
+
+ if (old_size) {
+ qcow2_free_clusters(bs, old_offset, old_size, QCOW2_DISCARD_ALWAYS);
+ }
+
+ g_free(s->bitmap_directory);
+ s->bitmap_directory = new_dir;
+
+ return 0;
+
+fail:
+ g_free(new_dir);
+ if (new_offset > 0) {
+ qcow2_free_clusters(bs, new_offset, new_size, QCOW2_DISCARD_ALWAYS);
+ s->bitmap_directory_offset = old_offset;
+ s->bitmap_directory_size = old_size;
+ }
+
+ p = g_try_realloc(s->bitmap_directory, s->bitmap_directory_size);
+ if (p != NULL) {
+ s->bitmap_directory = p;
+ }
+
+ return ret;
+}
+
+/* store_bitmap()
+ * update bitmap table by storing bitmap to it.
+ * Bitmap table entries are assumed to be in big endian format
+ * On the error, the resulting bitmap table is valid for clearing, but
+ * may contain invalid bitmap */
+static int store_bitmap(BlockDriverState *bs, uint64_t *bitmap_table,
+ uint32_t bitmap_table_size,
+ const BdrvDirtyBitmap *bitmap)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+ int cl_size = s->cluster_size;
+ uint32_t i, tab_size = 0;
+ uint64_t *tab;
+ uint32_t j;
+
+ bdrv_dirty_bitmap_prepare_store(bitmap, s->cluster_size, NULL, &tab_size);
+ tab = g_try_malloc(tab_size * sizeof(tab[0]));
+ if (tab == NULL) {
+ return -ENOMEM;
+ }
+
+ ret = bdrv_dirty_bitmap_prepare_store(bitmap, s->cluster_size,
+ tab, &tab_size);
+ if (ret != 0) {
+ g_free(tab);
+ return ret;
+ }
+
+ for (i = 0, j = 0; i < bitmap_table_size; ++i) {
+ if (tab[i] <= 1) {
+ continue;
+ }
+
+ for ( ; j < bitmap_table_size && bitmap_table[j] <= 1; ++j) {
+ ;
+ }
+
+ if (j < bitmap_table_size) {
+ tab[i] = be64_to_cpu(bitmap_table[j]);
+ } else {
+ tab[i] = qcow2_alloc_clusters(bs, cl_size);
+ }
+ }
+
+ for ( ; j < bitmap_table_size; ++j) {
+ uint64_t addr = be64_to_cpu(bitmap_table[j]);
+ if (addr <= 1) {
+ continue;
+ }
+
+ qcow2_free_clusters(bs, addr, cl_size, QCOW2_DISCARD_ALWAYS);
+ bitmap_table[j] = 0;
+ }
+
+ bdrv_dirty_bitmap_store(bitmap, bs->file->bs, tab,
+ bitmap_table_size, s->cluster_size);
+
+ for (i = 0; i < bitmap_table_size; ++i) {
+ bitmap_table[i] = cpu_to_be64(tab[i]);
+ }
+
+ g_free(tab);
+
+ return 0;
+}
+
+static int64_t alloc_zeroed_clusters(BlockDriverState *bs, uint64_t size)
+{
+ int ret = 0;
+ void *buf = NULL;
+ int64_t offset = qcow2_alloc_clusters(bs, size);
+ if (offset < 0) {
+ return offset;
+ }
+
+ buf = g_try_malloc0(size);
+ if (buf == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = qcow2_pre_write_overlap_check(bs, 0, offset, size);
+ if (ret < 0) {
+ goto out;
+ }
+
+ ret = bdrv_pwrite(bs->file->bs, offset, buf, size);
+ if (ret < 0) {
+ goto out;
+ }
+
+ ret = bdrv_flush(bs);
+ if (ret < 0) {
+ goto out;
+ }
+
+out:
+ g_free(buf);
+
+ if (ret < 0) {
+ qcow2_free_clusters(bs, offset, size, QCOW2_DISCARD_ALWAYS);
+ return ret;
+ }
+
+ return offset;
+}
+
+static int directory_push(BlockDriverState *bs, const char *name,
+ uint64_t size, int granularity)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+ int sector_granularity = granularity >> BDRV_SECTOR_BITS;
+ size_t name_size = strlen(name);
+ size_t entry_size = calc_dir_entry_size(name_size);
+ QCow2BitmapHeader *entry = g_malloc0(entry_size);
+ int64_t table_offset = 0;
+
+ entry->granularity_bits = ctz32(granularity);
+ entry->type = BT_DIRTY_TRACKING_BITMAP;
+ entry->name_size = name_size;
+ memcpy(entry + 1, name, name_size);
+
+ entry->bitmap_table_size =
+ size_to_clusters(s, (((size - 1) / sector_granularity) >> 3) + 1);
+ table_offset = alloc_zeroed_clusters(bs, entry->bitmap_table_size *
+ sizeof(uint64_t));
+ if (table_offset < 0) {
+ ret = table_offset;
+ goto out;
+ }
+ entry->bitmap_table_offset = table_offset;
+
+ ret = directory_push_entry(bs, entry);
+ if (ret < 0) {
+ goto out;
+ }
+
+out:
+ g_free(entry);
+ if (ret < 0 && table_offset > 0) {
+ qcow2_free_clusters(bs, table_offset, entry->bitmap_table_size *
+ sizeof(uint64_t), QCOW2_DISCARD_ALWAYS);
+ }
+
+ return ret;
+}
+
+static int bitmaps_push(BDRVQcow2State *s, const char *name, uint64_t offset)
+{
+ QCow2Bitmap *bm;
+ QCow2Bitmap *p;
+
+ printf("dirty bitmaps push\n");
+ p = g_try_renew(QCow2Bitmap, s->bitmaps, s->nb_bitmaps + 1);
+ if (p == NULL) {
+ return -ENOMEM;
+ }
+ s->bitmaps = p;
+ s->nb_bitmaps++;
+
+ bm = s->bitmaps + s->nb_bitmaps - 1;
+ bm->name = g_strdup(name);
+ bm->offset = offset;
+
+
+ return 0;
+}
+
+static void bitmaps_pop(BDRVQcow2State *s)
+{
+ QCow2Bitmap *p;
+
+ if (s->nb_bitmaps == 0) {
+ return;
+ }
+
+ p = g_try_renew(QCow2Bitmap, s->bitmaps, s->nb_bitmaps - 1);
+ if (p != NULL) {
+ s->bitmaps = p;
+ }
+
+ s->nb_bitmaps--;
+}
+
+/* if no id is provided, a new one is constructed */
+static int qcow2_bitmap_create(BlockDriverState *bs, const char *name,
+ uint64_t size, int granularity)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+
+ if (s->nb_bitmaps >= QCOW_MAX_DIRTY_BITMAPS) {
+ return -EFBIG;
+ }
+
+ /* Check that the name is unique */
+ if (find_bitmap_by_name(bs, name) != NULL) {
+ return -EEXIST;
+ }
+
+ ret = bitmaps_push(s, name, s->bitmap_directory_size);
+ if (ret < 0) {
+ return ret;
+ }
+
+ ret = directory_push(bs, name, size, granularity);
+ if (ret < 0) {
+ bitmaps_pop(s);
+ return ret;
+ }
+
+ return 0;
+}
+
+void qcow2_bitmap_store(BlockDriverState *bs,
+ const BdrvDirtyBitmap *bitmap, Error **errp)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int ret = 0;
+ uint64_t *bitmap_table;
+ QCow2Bitmap *bm;
+ QCow2BitmapHeader *bmh;
+ const char *name = bdrv_dirty_bitmap_name(bitmap);
+ uint64_t size = bdrv_dirty_bitmap_size(bitmap);
+ int granularity = bdrv_dirty_bitmap_granularity(bitmap);
+
+ /* find/create dirty bitmap */
+ bm = find_bitmap_by_name(bs, name);
+ if (bm == NULL) {
+ ret = qcow2_bitmap_create(bs, name, size, granularity);
+ if (ret < 0) {
+ error_setg_errno(errp, ret, "Can't create dirty bitmap in qcow2.");
+ }
+ bm = s->bitmaps + s->nb_bitmaps - 1;
+ bmh = bitmap_header(s, bm);
+ } else {
+ bmh = bitmap_header(s, bm);
+
+ if (granularity != (1U << bmh->granularity_bits)) {
+ error_setg(errp,
+ "The bitmap with same name (but other granularity) "
+ "already exists.");
+ return;
+ }
+ }
+
+ bitmap_table = g_try_new(uint64_t, bmh->bitmap_table_size);
+ if (bitmap_table == NULL) {
+ error_setg(errp, "No memory.");
+ return;
+ }
+ ret = bdrv_pread(bs->file->bs, bmh->bitmap_table_offset,
+ bitmap_table,
+ bmh->bitmap_table_size * sizeof(uint64_t));
+ if (ret < 0) {
+ error_setg_errno(errp, ret, "Can't read dirty bitmap table.");
+ goto finish;
+ }
+
+ ret = store_bitmap(bs, bitmap_table, bmh->bitmap_table_size,
+ bitmap);
+ if (ret < 0) {
+ error_setg_errno(errp, ret, "Can't store bitmap table.");
+ goto finish;
+ }
+
+ ret = bdrv_pwrite(bs->file->bs, bmh->bitmap_table_offset,
+ bitmap_table,
+ bmh->bitmap_table_size * sizeof(uint64_t));
+ if (ret < 0) {
+ error_setg_errno(errp, ret, "Can't write dirty bitmap table.");
+ goto finish;
+ }
+
+finish:
+ g_free(bitmap_table);
+}
diff --git a/block/qcow2.c b/block/qcow2.c
index fe53338..75ec4c0 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3347,6 +3347,7 @@ BlockDriver bdrv_qcow2 = {
.bdrv_get_specific_info = qcow2_get_specific_info,
.bdrv_dirty_bitmap_load = qcow2_bitmap_load,
+ .bdrv_dirty_bitmap_store = qcow2_bitmap_store,
.bdrv_save_vmstate = qcow2_save_vmstate,
.bdrv_load_vmstate = qcow2_load_vmstate,
diff --git a/block/qcow2.h b/block/qcow2.h
index cc4c776..e4a517c 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -622,6 +622,8 @@ int qcow2_read_bitmaps(BlockDriverState *bs, Error **errp);
BdrvDirtyBitmap *qcow2_bitmap_load(BlockDriverState *bs, const char *name,
Error **errp);
+void qcow2_bitmap_store(BlockDriverState *bs, const BdrvDirtyBitmap *bitmap,
+ Error **errp);
/* qcow2-cache.c functions */
Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 7c0290e..be8f8a3 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -217,6 +217,9 @@ struct BlockDriver {
BdrvDirtyBitmap *(*bdrv_dirty_bitmap_load)(BlockDriverState *bs,
const char *name,
Error **errp);
+ void (*bdrv_dirty_bitmap_store)(BlockDriverState *bs,
+ const BdrvDirtyBitmap *bitmap,
+ Error **errp);
int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t pos);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 06/17] qcow2: add dirty bitmaps extension
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (4 preceding siblings ...)
2016-02-17 15:28 ` [Qemu-devel] [PATCH 05/17] qcow2-dirty-bitmap: add qcow2_bitmap_store() Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 07/17] qcow2-dirty-bitmap: add qcow2_bitmap_load_check() Vladimir Sementsov-Ogievskiy
` (13 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Add dirty bitmap extension as specified in docs/specs/qcow2.txt.
Load bitmap headers on open. Handle close and update_header.
Handle resize: for now, just block resize if there are dirty bitmaps.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/block/qcow2.c b/block/qcow2.c
index 75ec4c0..6b6914d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -61,6 +61,7 @@ typedef struct {
#define QCOW2_EXT_MAGIC_END 0
#define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA
#define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857
+#define QCOW2_EXT_MAGIC_DIRTY_BITMAPS 0x23852875
static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
{
@@ -90,6 +91,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
QCowExtension ext;
uint64_t offset;
int ret;
+ Qcow2BitmapHeaderExt bitmaps_ext;
#ifdef DEBUG_EXT
printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
@@ -160,6 +162,67 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
}
break;
+ case QCOW2_EXT_MAGIC_DIRTY_BITMAPS:
+ ret = bdrv_pread(bs->file->bs, offset, &bitmaps_ext, ext.len);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "ERROR: bitmaps_ext: "
+ "Could not read ext header");
+ return ret;
+ }
+
+ if (bitmaps_ext.reserved32 != 0) {
+ error_setg_errno(errp, -ret, "ERROR: bitmaps_ext: "
+ "Reserved field is not zero.");
+ return -EINVAL;
+ }
+
+ be32_to_cpus(&bitmaps_ext.nb_bitmaps);
+ be64_to_cpus(&bitmaps_ext.bitmap_directory_size);
+ be64_to_cpus(&bitmaps_ext.bitmap_directory_offset);
+
+ if (bitmaps_ext.nb_bitmaps > QCOW_MAX_DIRTY_BITMAPS) {
+ error_setg(errp, "ERROR: bitmaps_ext: "
+ "too many dirty bitmaps");
+ return -EINVAL;
+ }
+
+ if (bitmaps_ext.nb_bitmaps == 0) {
+ error_setg(errp, "ERROR: bitmaps_ext: "
+ "found bitmaps extension with zero bitmaps");
+ return -EINVAL;
+ }
+
+ if (bitmaps_ext.bitmap_directory_offset & (s->cluster_size - 1)) {
+ error_setg(errp, "ERROR: bitmaps_ext: "
+ "wrong dirty bitmap directory offset");
+ return -EINVAL;
+ }
+
+ if (bitmaps_ext.bitmap_directory_size >
+ QCOW_MAX_DIRTY_BITMAP_DIRECTORY_SIZE) {
+ error_setg(errp, "ERROR: bitmaps_ext: "
+ "too large dirty bitmap directory");
+ return -EINVAL;
+ }
+
+ s->nb_bitmaps = bitmaps_ext.nb_bitmaps;
+ s->bitmap_directory_offset =
+ bitmaps_ext.bitmap_directory_offset;
+ s->bitmap_directory_size =
+ bitmaps_ext.bitmap_directory_size;
+
+ ret = qcow2_read_bitmaps(bs, errp);
+ if (ret < 0) {
+ return ret;
+ }
+
+#ifdef DEBUG_EXT
+ printf("Qcow2: Got dirty bitmaps extension:"
+ " offset=%" PRIu64 " nb_bitmaps=%" PRIu32 "\n",
+ s->bitmaps_offset, s->nb_bitmaps);
+#endif
+ break;
+
default:
/* unknown magic - save it in case we need to rewrite the header */
{
@@ -1177,6 +1240,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
g_free(s->unknown_header_fields);
cleanup_unknown_header_ext(bs);
qcow2_free_snapshots(bs);
+ qcow2_free_bitmaps(bs);
qcow2_refcount_close(bs);
qemu_vfree(s->l1_table);
/* else pre-write overlap checks in cache_destroy may crash */
@@ -1740,6 +1804,7 @@ static void qcow2_close(BlockDriverState *bs)
qemu_vfree(s->cluster_data);
qcow2_refcount_close(bs);
qcow2_free_snapshots(bs);
+ qcow2_free_bitmaps(bs);
}
static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
@@ -1937,6 +2002,24 @@ int qcow2_update_header(BlockDriverState *bs)
buflen -= ret;
}
+ if (s->nb_bitmaps > 0) {
+ Qcow2BitmapHeaderExt bitmaps_header = {
+ .nb_bitmaps = cpu_to_be32(s->nb_bitmaps),
+ .bitmap_directory_size =
+ cpu_to_be64(s->bitmap_directory_size),
+ .bitmap_directory_offset =
+ cpu_to_be64(s->bitmap_directory_offset)
+ };
+ ret = header_ext_add(buf, QCOW2_EXT_MAGIC_DIRTY_BITMAPS,
+ &bitmaps_header, sizeof(bitmaps_header),
+ buflen);
+ if (ret < 0) {
+ goto fail;
+ }
+ buf += ret;
+ buflen -= ret;
+ }
+
/* Keep unknown header extensions */
QLIST_FOREACH(uext, &s->unknown_header_ext, next) {
ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen);
@@ -2460,6 +2543,12 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
return -ENOTSUP;
}
+ /* cannot proceed if image has bitmaps */
+ if (s->nb_bitmaps) {
+ error_report("Can't resize an image which has dirty bitmaps");
+ return -ENOTSUP;
+ }
+
/* shrinking is currently not supported */
if (offset < bs->total_sectors * 512) {
error_report("qcow2 doesn't support shrinking images yet");
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 07/17] qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (5 preceding siblings ...)
2016-02-17 15:28 ` [Qemu-devel] [PATCH 06/17] qcow2: add dirty bitmaps extension Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:28 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 08/17] block: store persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (12 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:28 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
The function checks existing of the bitmap without loading it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/dirty-bitmap.c | 15 +++++++++++++++
block/qcow2-dirty-bitmap.c | 5 +++++
block/qcow2.c | 1 +
block/qcow2.h | 1 +
include/block/block_int.h | 2 ++
include/block/dirty-bitmap.h | 1 +
6 files changed, 25 insertions(+)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 982f930..115efb8 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -514,3 +514,18 @@ int bdrv_dirty_bitmap_store(const BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
{
return hbitmap_store(bitmap->bitmap, bs, table, table_size, cluster_size);
}
+
+bool bdrv_load_check_dirty_bitmap(BlockDriverState *file, const char *name)
+{
+ BlockDriver *drv = file->drv;
+ if (!drv) {
+ return false;
+ }
+ if (drv->bdrv_dirty_bitmap_load_check) {
+ return drv->bdrv_dirty_bitmap_load_check(file, name);
+ }
+ if (file->file) {
+ return bdrv_load_check_dirty_bitmap(file->file->bs, name);
+ }
+ return false;
+}
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 979e17e..9f8ad6b 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -274,6 +274,11 @@ static int load_bitmap_data(BlockDriverState *bs, const uint64_t *bitmap_table,
return ret;
}
+bool qcow2_bitmap_load_check(BlockDriverState *file, const char *name)
+{
+ return find_bitmap_by_name(file, name) != NULL;
+}
+
static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
Error **errp)
{
diff --git a/block/qcow2.c b/block/qcow2.c
index 6b6914d..0e75eeb 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3436,6 +3436,7 @@ BlockDriver bdrv_qcow2 = {
.bdrv_get_specific_info = qcow2_get_specific_info,
.bdrv_dirty_bitmap_load = qcow2_bitmap_load,
+ .bdrv_dirty_bitmap_load_check = qcow2_bitmap_load_check,
.bdrv_dirty_bitmap_store = qcow2_bitmap_store,
.bdrv_save_vmstate = qcow2_save_vmstate,
diff --git a/block/qcow2.h b/block/qcow2.h
index e4a517c..423c279 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -620,6 +620,7 @@ int qcow2_read_snapshots(BlockDriverState *bs);
void qcow2_free_bitmaps(BlockDriverState *bs);
int qcow2_read_bitmaps(BlockDriverState *bs, Error **errp);
+bool qcow2_bitmap_load_check(BlockDriverState *file, const char *name);
BdrvDirtyBitmap *qcow2_bitmap_load(BlockDriverState *bs, const char *name,
Error **errp);
void qcow2_bitmap_store(BlockDriverState *bs, const BdrvDirtyBitmap *bitmap,
diff --git a/include/block/block_int.h b/include/block/block_int.h
index be8f8a3..59948e9 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -214,6 +214,8 @@ struct BlockDriver {
int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
+ bool (*bdrv_dirty_bitmap_load_check)(BlockDriverState *file,
+ const char *name);
BdrvDirtyBitmap *(*bdrv_dirty_bitmap_load)(BlockDriverState *bs,
const char *name,
Error **errp);
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 1e16a5f..5d8c2c1 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -78,5 +78,6 @@ int bdrv_dirty_bitmap_prepare_store(const BdrvDirtyBitmap *bitmap,
int bdrv_dirty_bitmap_store(const BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
const uint64_t *table, uint32_t table_size,
uint32_t cluster_size);
+bool bdrv_load_check_dirty_bitmap(BlockDriverState *file, const char *name);
#endif
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 08/17] block: store persistent dirty bitmaps
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (6 preceding siblings ...)
2016-02-17 15:28 ` [Qemu-devel] [PATCH 07/17] qcow2-dirty-bitmap: add qcow2_bitmap_load_check() Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 09/17] block: add bdrv_load_dirty_bitmap() Vladimir Sementsov-Ogievskiy
` (11 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Persistent dirty bitmaps are the bitmaps, for which the new field
BdrvDirtyBitmap.file is not NULL. We save all persistent dirty bitmaps
owned by BlockDriverState in corresponding bdrv_close().
BdrvDirtyBitmap.file is a BlockDriverState, where we want to save the
bitmap. It may be set in bdrv_dirty_bitmap_set_file() only once.
bdrv_ref/bdrv_unref are used for BdrvDirtyBitmap.file to be sure that
files will be closed and resources will be freed.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block.c | 3 +++
block/dirty-bitmap.c | 35 +++++++++++++++++++++++++++++++++++
include/block/dirty-bitmap.h | 5 +++++
3 files changed, 43 insertions(+)
diff --git a/block.c b/block.c
index afb71c0..ce76f2e 100644
--- a/block.c
+++ b/block.c
@@ -2143,6 +2143,9 @@ void bdrv_close(BlockDriverState *bs)
blk_dev_change_media_cb(bs->blk, false);
}
+ /* save and release persistent dirty bitmaps */
+ bdrv_finalize_persistent_dirty_bitmaps(bs);
+
if (bs->drv) {
BdrvChild *child, *next;
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 115efb8..0876c38 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -43,6 +43,7 @@ struct BdrvDirtyBitmap {
int64_t size; /* Size of the bitmap (Number of sectors) */
bool disabled; /* Bitmap is read-only */
int active_iterators; /* How many iterators are active */
+ bool internal_persistent; /* bitmap must be saved to owner disk image */
QLIST_ENTRY(BdrvDirtyBitmap) list;
};
@@ -529,3 +530,37 @@ bool bdrv_load_check_dirty_bitmap(BlockDriverState *file, const char *name)
}
return false;
}
+
+void bdrv_store_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ Error **errp)
+{
+ if (bs == NULL || bs->drv == NULL ||
+ bs->drv->bdrv_dirty_bitmap_store == NULL) {
+ error_setg(errp, "Storing bitmap is unsupported for the format.");
+ return;
+ }
+
+ bs->drv->bdrv_dirty_bitmap_store(bs, bitmap, errp);
+}
+
+void bdrv_dirty_bitmap_set_internal_persistance(BdrvDirtyBitmap *bitmap,
+ bool persistent)
+{
+ bitmap->internal_persistent = persistent;
+}
+
+void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs)
+{
+ BdrvDirtyBitmap *bm, *bm_next;
+
+ QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, bm_next) {
+ if (bm->internal_persistent) {
+ Error *local_err = NULL;
+ bdrv_store_dirty_bitmap(bs, bm, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ }
+ bdrv_release_dirty_bitmap(bs, bm);
+ }
+ }
+}
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 5d8c2c1..a4f13f1 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -79,5 +79,10 @@ int bdrv_dirty_bitmap_store(const BdrvDirtyBitmap *bitmap, BlockDriverState *bs,
const uint64_t *table, uint32_t table_size,
uint32_t cluster_size);
bool bdrv_load_check_dirty_bitmap(BlockDriverState *file, const char *name);
+void bdrv_dirty_bitmap_set_internal_persistance(BdrvDirtyBitmap *bitmap,
+ bool persistent);
+void bdrv_store_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
+ Error **errp);
+void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs);
#endif
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 09/17] block: add bdrv_load_dirty_bitmap()
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (7 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 08/17] block: store persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 10/17] qcow2-dirty-bitmap: add autoclear bit Vladimir Sementsov-Ogievskiy
` (10 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
The funcion loads dirty bitmap from file, using underlying driver
function.
Note: the function doesn't change BdrvDirtyBitmap.file field. This field
is only used by bdrv_store_dirty_bitmap() function and is ONLY written
by bdrv_dirty_bitmap_set_file() function.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/dirty-bitmap.c | 16 ++++++++++++++++
include/block/dirty-bitmap.h | 2 ++
2 files changed, 18 insertions(+)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 0876c38..67f925e 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -564,3 +564,19 @@ void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs)
}
}
}
+
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
+ Error **errp)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return NULL;
+ }
+ if (drv->bdrv_dirty_bitmap_load) {
+ return drv->bdrv_dirty_bitmap_load(bs, name, errp);
+ }
+ if (bs->file) {
+ return bdrv_load_dirty_bitmap(bs, name, errp);
+ }
+ return NULL;
+}
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index a4f13f1..073013d 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -84,5 +84,7 @@ void bdrv_dirty_bitmap_set_internal_persistance(BdrvDirtyBitmap *bitmap,
void bdrv_store_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
Error **errp);
void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs);
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
+ Error **errp);
#endif
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 10/17] qcow2-dirty-bitmap: add autoclear bit
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (8 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 09/17] block: add bdrv_load_dirty_bitmap() Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 11/17] qemu: command line option for dirty bitmaps Vladimir Sementsov-Ogievskiy
` (9 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Add autoclear bit for handling rewriting image by old qemu version.
If autoclear bit is not set, but bitmaps extension is found it
would not be loaded and warning will be generated.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 4 ++++
block/qcow2.c | 12 ++++++++++--
block/qcow2.h | 9 +++++++++
3 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 9f8ad6b..18f271f 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -417,6 +417,7 @@ static int directory_push_entry(BlockDriverState *bs, QCow2BitmapHeader *header)
int64_t new_offset = 0, old_offset = 0;
uint64_t new_size = s->bitmap_directory_size + entry_size, old_size = 0;
void *p;
+ uint64_t old_autocl;
int64_t nb_sectors = bdrv_nb_sectors(bs);
if (nb_sectors < 0) {
@@ -435,6 +436,7 @@ static int directory_push_entry(BlockDriverState *bs, QCow2BitmapHeader *header)
old_offset = s->bitmap_directory_offset;
old_size = s->bitmap_directory_size;
+ old_autocl = s->autoclear_features;
uint8_t *new_dir = g_try_malloc(new_size);
if (new_dir == NULL) {
@@ -456,6 +458,7 @@ static int directory_push_entry(BlockDriverState *bs, QCow2BitmapHeader *header)
s->bitmap_directory_offset = new_offset;
s->bitmap_directory_size = new_size;
+ s->autoclear_features |= QCOW2_AUTOCLEAR_DIRTY_BITMAPS;
ret = update_header_sync(bs);
if (ret < 0) {
@@ -477,6 +480,7 @@ fail:
qcow2_free_clusters(bs, new_offset, new_size, QCOW2_DISCARD_ALWAYS);
s->bitmap_directory_offset = old_offset;
s->bitmap_directory_size = old_size;
+ s->autoclear_features = old_autocl;
}
p = g_try_realloc(s->bitmap_directory, s->bitmap_directory_size);
diff --git a/block/qcow2.c b/block/qcow2.c
index 0e75eeb..48ae6bc 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -163,6 +163,13 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
break;
case QCOW2_EXT_MAGIC_DIRTY_BITMAPS:
+ if (!(s->autoclear_features & QCOW2_AUTOCLEAR_DIRTY_BITMAPS)) {
+ fprintf(stderr,
+ "WARNING: bitmaps_ext: autoclear flag is not "
+ "set, all bitmaps will be considered as inconsistent");
+ break;
+ }
+
ret = bdrv_pread(bs->file->bs, offset, &bitmaps_ext, ext.len);
if (ret < 0) {
error_setg_errno(errp, -ret, "ERROR: bitmaps_ext: "
@@ -1204,8 +1211,9 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Clear unknown autoclear feature bits */
- if (!bs->read_only && !(flags & BDRV_O_INACTIVE) && s->autoclear_features) {
- s->autoclear_features = 0;
+ if (!bs->read_only && !(flags & BDRV_O_INACTIVE) &&
+ (s->autoclear_features & ~QCOW2_AUTOCLEAR_MASK)) {
+ s->autoclear_features &= QCOW2_AUTOCLEAR_MASK;
ret = qcow2_update_header(bs);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not update qcow2 header");
diff --git a/block/qcow2.h b/block/qcow2.h
index 423c279..63ea543 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -220,6 +220,15 @@ enum {
QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
};
+/* Autoclear feature bits */
+enum {
+ QCOW2_AUTOCLEAR_DIRTY_BITMAPS_BITNR = 0,
+ QCOW2_AUTOCLEAR_DIRTY_BITMAPS =
+ 1 << QCOW2_AUTOCLEAR_DIRTY_BITMAPS_BITNR,
+
+ QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_DIRTY_BITMAPS,
+};
+
enum qcow2_discard_type {
QCOW2_DISCARD_NEVER = 0,
QCOW2_DISCARD_ALWAYS,
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 11/17] qemu: command line option for dirty bitmaps
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (9 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 10/17] qcow2-dirty-bitmap: add autoclear bit Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 12/17] qcow2-dirty-bitmap: add IN_USE flag Vladimir Sementsov-Ogievskiy
` (8 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
The patch adds the following command line option:
-dirty-bitmap [option1=val1][,option2=val2]...
Avaliable options are:
name
The name of the bitmap.
Should be unique per 'file'/'node' and per 'for_node'.
node
The node to load and bind the bitmap.
It should be specified as 'id' suboption of one of '-node' options.
granularity
Granularity (in bytes) for created dirty bitmap.
If the bitmap is already exists in specified 'file'/'file_id'/device
it's granularity will not be changed but only checked (an error will be
generated if this check fails).
enabled
on|off
Enabled flag for the bitmap.
By default the bitmap will be enabled.
create
on|off
By default is off.
If on, then new bitmap will be created in the image, if the bitmap with
same name is already exists an error will be generated.
If off, then the bitmap will be loaded from the image, if there is no
one an error will be generated.
If create=off and granularity is specified then granularity will be
checked for loaded bitmap and if not match an error will be generated.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
blockdev.c | 36 ++++++++++++++++++++++
include/sysemu/blockdev.h | 1 +
include/sysemu/sysemu.h | 1 +
qemu-options.hx | 35 +++++++++++++++++++++
vl.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 151 insertions(+)
diff --git a/blockdev.c b/blockdev.c
index 07cfe25..98ebe7a 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -181,6 +181,12 @@ QemuOpts *drive_def(const char *optstr)
return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
}
+QemuOpts *dirty_bitmap_def(const char *optstr)
+{
+ return qemu_opts_parse_noisily(qemu_find_opts("dirty-bitmap"), optstr,
+ false);
+}
+
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr)
{
@@ -3953,6 +3959,36 @@ BlockJobInfoList *qmp_query_block_jobs(Error **errp)
return head;
}
+QemuOptsList qemu_dirty_bitmap_opts = {
+ .name = "dirty-bitmap",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_dirty_bitmap_opts.head),
+ .desc = {
+ {
+ .name = "name",
+ .type = QEMU_OPT_STRING,
+ .help = "Name of the dirty bitmap",
+ },{
+ .name = "node",
+ .type = QEMU_OPT_STRING,
+ .help = "node name to bind the bitmap to (and load it from it)",
+ },{
+ .name = "granularity",
+ .type = QEMU_OPT_NUMBER,
+ .help = "granularity",
+ },{
+ .name = "enabled",
+ .type = QEMU_OPT_BOOL,
+ .help = "enabled flag (default is 'on')",
+ },{
+ .name = "create",
+ .type = QEMU_OPT_BOOL,
+ .help = "create flag (default is 'off'), "
+ "if on, new dirty bitmap will be created, "
+ "else the existing one will be loaded"
+ }
+ }
+};
+
QemuOptsList qemu_common_drive_opts = {
.name = "drive",
.head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
index b06a060..221143a 100644
--- a/include/sysemu/blockdev.h
+++ b/include/sysemu/blockdev.h
@@ -57,6 +57,7 @@ int drive_get_max_devs(BlockInterfaceType type);
DriveInfo *drive_get_next(BlockInterfaceType type);
QemuOpts *drive_def(const char *optstr);
+QemuOpts *dirty_bitmap_def(const char *optstr);
QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
const char *optstr);
DriveInfo *drive_new(QemuOpts *arg, BlockInterfaceType block_default_type);
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 3bb8897..7dc3980 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -248,6 +248,7 @@ bool usb_enabled(void);
extern QemuOptsList qemu_legacy_drive_opts;
extern QemuOptsList qemu_common_drive_opts;
+extern QemuOptsList qemu_dirty_bitmap_opts;
extern QemuOptsList qemu_drive_opts;
extern QemuOptsList qemu_chardev_opts;
extern QemuOptsList qemu_device_opts;
diff --git a/qemu-options.hx b/qemu-options.hx
index b4763ba..636a8e7 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -679,6 +679,41 @@ qemu-system-i386 -hda a -hdb b
@end example
ETEXI
+DEF("dirty-bitmap", HAS_ARG, QEMU_OPTION_dirty_bitmap,
+ "-dirty-bitmap name=name,node=@var{id}\n"
+ " [,granularity=granularity][,enabled=on|off][,create=on|off]\n",
+ QEMU_ARCH_ALL)
+STEXI
+@item -dirty-bitmap @var{option}[,@var{option}[,@var{option}[,...]]]
+@findex -dirty-bitmap
+
+Define a dirty-bitmap. Valid options are:
+
+@table @option
+@item name=@var{name}
+The name of the bitmap. Should be unique per @var{file}/@var{node} and per
+@var{for_node}.
+@item node=@var{node}
+The node to load and bind the bitmap. It should be specified as @var{id} suboption
+of one of @option{-node} options.
+@item granularity=@var{granularity}
+Granularity (in bytes) for created dirty bitmap. If the bitmap is already
+exists in specified @var{file}/@var{file_id}/@var{device} it's granularity will
+not be changed but only checked (an error will be generated if this check
+fails).
+@item enabled=@var{enabled}
+Enabled flag for the bitmap. By default the bitmap will be enabled.
+@item create=@var{create}
+By default is off.
+If on, then new bitmap will be created in the image, if the bitmap with same
+name is already exists an error will be generated.
+If off, then the bitmap will be loaded from the image, if there is no one an
+error will be generated.
+If create=off and granularity is specified then granularity will be checked for
+loaded bitmap and if not match an error will be generated.
+@end table
+ETEXI
+
DEF("mtdblock", HAS_ARG, QEMU_OPTION_mtdblock,
"-mtdblock file use 'file' as on-board Flash memory image\n",
QEMU_ARCH_ALL)
diff --git a/vl.c b/vl.c
index f043009..a0f08c5 100644
--- a/vl.c
+++ b/vl.c
@@ -1144,6 +1144,70 @@ static int cleanup_add_fd(void *opaque, QemuOpts *opts, Error **errp)
#define MTD_OPTS ""
#define SD_OPTS ""
+static int dirty_bitmap_func(void *opaque, QemuOpts *opts, Error **errp)
+{
+ BlockDriverState *bs = NULL;
+ BdrvDirtyBitmap *bitmap = NULL;
+
+ const char *name = qemu_opt_get(opts, "name");
+ const char *node = qemu_opt_get(opts, "node");
+
+ uint64_t granularity = qemu_opt_get_number(opts, "granularity", 0);
+ bool enabled = qemu_opt_get_bool(opts, "enabled", true);
+ bool create = qemu_opt_get_bool(opts, "create", false);
+
+ if (name == NULL) {
+ error_setg(errp, "'name' option is necessary");
+ return -EINVAL;
+ }
+
+ if (node == NULL) {
+ error_setg(errp, "'node' option is necessary");
+ return -EINVAL;
+ }
+
+ bs = bdrv_lookup_bs(node, node, errp);
+ if (bs == NULL) {
+ return -ENOENT;
+ }
+
+ if (create) {
+ if (bdrv_load_check_dirty_bitmap(bs, name)) {
+ error_setg(errp, "bitmap '%s' already exists", name);
+ return -EEXIST;
+ }
+
+ if (granularity == 0) {
+ granularity = bdrv_get_default_bitmap_granularity(bs);
+ }
+
+ bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
+ if (bitmap == NULL) {
+ return -EINVAL;
+ }
+ } else {
+ bitmap = bdrv_load_dirty_bitmap(bs, name, errp);
+ if (bitmap == NULL) {
+ return -EINVAL;
+ }
+
+ if (granularity != 0 &&
+ granularity != bdrv_dirty_bitmap_granularity(bitmap)) {
+ bdrv_release_dirty_bitmap(bs, bitmap);
+ error_setg(errp, "granularity doesn't match");
+ return -EINVAL;
+ }
+ }
+
+ bdrv_dirty_bitmap_set_internal_persistance(bitmap, true);
+
+ if (!enabled) {
+ bdrv_disable_dirty_bitmap(bitmap);
+ }
+
+ return 0;
+}
+
static int drive_init_func(void *opaque, QemuOpts *opts, Error **errp)
{
BlockInterfaceType *block_default_type = opaque;
@@ -3006,6 +3070,7 @@ int main(int argc, char **argv, char **envp)
module_call_init(MODULE_INIT_QOM);
qemu_add_opts(&qemu_drive_opts);
+ qemu_add_opts(&qemu_dirty_bitmap_opts);
qemu_add_drive_opts(&qemu_legacy_drive_opts);
qemu_add_drive_opts(&qemu_common_drive_opts);
qemu_add_drive_opts(&qemu_drive_opts);
@@ -3139,6 +3204,11 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
break;
+ case QEMU_OPTION_dirty_bitmap:
+ if (dirty_bitmap_def(optarg) == NULL) {
+ exit(1);
+ }
+ break;
case QEMU_OPTION_set:
if (qemu_set_option(optarg) != 0)
exit(1);
@@ -4454,6 +4524,14 @@ int main(int argc, char **argv, char **envp)
parse_numa_opts(machine_class);
+ if (qemu_opts_foreach(qemu_find_opts("dirty-bitmap"), dirty_bitmap_func,
+ NULL, &err)) {
+ if (err != NULL) {
+ error_report_err(err);
+ }
+ exit(1);
+ }
+
if (qemu_opts_foreach(qemu_find_opts("mon"),
mon_init_func, NULL, NULL)) {
exit(1);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 12/17] qcow2-dirty-bitmap: add IN_USE flag
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (10 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 11/17] qemu: command line option for dirty bitmaps Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 13/17] qcow2-dirty-bitmaps: disallow stroing bitmap to other bs Vladimir Sementsov-Ogievskiy
` (7 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
This flag is set on bitmap load and unset on store. If it is already
set when loading the bitmap, the bitmap should not be load (it is in
use by other drive or it is inconsistent (was not successfully saved))
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 18f271f..189b74b 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -40,7 +40,8 @@
#define BME_MAX_NAME_SIZE 1023
/* Bitmap directory entry flags */
-#define BME_RESERVED_FLAGS 0xffffffff
+#define BME_RESERVED_FLAGS 0xfffffffe
+#define BME_FLAG_IN_USE 1
/* bits [1, 8] U [56, 63] are reserved */
#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
@@ -132,6 +133,29 @@ static QCow2BitmapHeader *bitmap_header(BDRVQcow2State *s,
(s->bitmap_directory + bitmap->offset);
}
+static int update_bitmap_header_sync(BlockDriverState *bs, QCow2Bitmap *bitmap)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+ QCow2BitmapHeader *h = bitmap_header(s, bitmap);
+
+ bitmap_header_to_be(h);
+ ret = bdrv_pwrite(bs->file->bs,
+ s->bitmap_directory_offset + bitmap->offset,
+ h, dir_entry_size(h));
+ bitmap_header_to_cpu(h);
+ if (ret < 0) {
+ return ret;
+ }
+
+ ret = bdrv_flush(bs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return 0;
+}
+
static int directory_read(BlockDriverState *bs, Error **errp)
{
int ret;
@@ -291,6 +315,11 @@ static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
bmh = bitmap_header(s, bm);
+ if (bmh->flags & BME_FLAG_IN_USE) {
+ error_setg(errp, "Bitmap '%s' is in use", bm->name);
+ return NULL;
+ }
+
bitmap_table = g_try_malloc(bmh->bitmap_table_size * sizeof(uint64_t));
if (bitmap_table == NULL) {
error_setg_errno(errp, -ENOMEM,
@@ -319,6 +348,13 @@ static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
goto fail;
}
+ bmh->flags |= BME_FLAG_IN_USE;
+ ret = update_bitmap_header_sync(bs, bm);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Could not set in_use in bitmap header");
+ goto fail;
+ }
+
g_free(bitmap_table);
return bitmap;
@@ -767,6 +803,13 @@ void qcow2_bitmap_store(BlockDriverState *bs,
goto finish;
}
+ bmh->flags &= ~BME_FLAG_IN_USE;
+ ret = update_bitmap_header_sync(bs, bm);
+ if (ret < 0) {
+ error_setg_errno(errp, ret, "Can't update bitmap header.");
+ goto finish;
+ }
+
finish:
g_free(bitmap_table);
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 13/17] qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (11 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 12/17] qcow2-dirty-bitmap: add IN_USE flag Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 14/17] iotests: add VM.test_launcn() Vladimir Sementsov-Ogievskiy
` (6 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Check, that bitmap is stored to the owning bs.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/dirty-bitmap.c | 12 ++++++++++++
block/qcow2-dirty-bitmap.c | 5 +++++
include/block/dirty-bitmap.h | 2 ++
3 files changed, 19 insertions(+)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 67f925e..37a910f 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -580,3 +580,15 @@ BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
}
return NULL;
}
+
+bool bdrv_has_dirty_bitmap(BlockDriverState *bs, const BdrvDirtyBitmap *bitmap)
+{
+ BdrvDirtyBitmap *bm, *next;
+ QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
+ if (bm == bitmap) {
+ return true;
+ }
+ }
+
+ return false;
+}
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 189b74b..8e9fd81 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -755,6 +755,11 @@ void qcow2_bitmap_store(BlockDriverState *bs,
uint64_t size = bdrv_dirty_bitmap_size(bitmap);
int granularity = bdrv_dirty_bitmap_granularity(bitmap);
+ if (!bdrv_has_dirty_bitmap(bs, bitmap)) {
+ error_setg(errp, "Can't store bitmap to the other node.");
+ return;
+ }
+
/* find/create dirty bitmap */
bm = find_bitmap_by_name(bs, name);
if (bm == NULL) {
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 073013d..4f81f0a 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -87,4 +87,6 @@ void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs);
BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
Error **errp);
+bool bdrv_has_dirty_bitmap(BlockDriverState *bs, const BdrvDirtyBitmap *bitmap);
+
#endif
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 14/17] iotests: add VM.test_launcn()
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (12 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 13/17] qcow2-dirty-bitmaps: disallow stroing bitmap to other bs Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 15/17] iotests: test internal persistent dirty bitmap Vladimir Sementsov-Ogievskiy
` (5 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Test vm can launch and print output in case of fail. This function is
needed for testing erroneous cases
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
tests/qemu-iotests/iotests.py | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 737da20..c879e88 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -226,6 +226,25 @@ class VM(object):
os.remove(self._monitor_path)
raise
+ def test_launch(self):
+ '''Launch the VM, an error is expected'''
+ try:
+ self.launch()
+ except:
+ self._popen.wait()
+ print "Test launch failed: %d" % self._popen.returncode
+ print "--- qemu output ---"
+ for line in open(self._qemu_log_path):
+ #filter qtest comments
+ if not "] OPENED" in line:
+ print line
+ print "--- end qemu output ---"
+ return False
+
+ print "Tast launch successed!"
+ self.shutdown()
+ return True
+
def shutdown(self):
'''Terminate the VM and clean up'''
if not self._popen is None:
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 15/17] iotests: test internal persistent dirty bitmap
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (13 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 14/17] iotests: add VM.test_launcn() Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 16/17] qcow2-dirty-bitmap: add AUTO flag Vladimir Sementsov-Ogievskiy
` (4 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
Add simple test cases for testing persistent dirty bitmaps.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
tests/qemu-iotests/160 | 112 ++++++++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/160.out | 21 ++++++++
tests/qemu-iotests/group | 1 +
tests/qemu-iotests/iotests.py | 6 +++
4 files changed, 140 insertions(+)
create mode 100755 tests/qemu-iotests/160
create mode 100644 tests/qemu-iotests/160.out
diff --git a/tests/qemu-iotests/160 b/tests/qemu-iotests/160
new file mode 100755
index 0000000..f9843da
--- /dev/null
+++ b/tests/qemu-iotests/160
@@ -0,0 +1,112 @@
+#!/usr/bin/env python
+#
+# Tests for persistent dirty bitmaps.
+#
+# Copyright: Vladimir Sementsov-Ogievskiy 2015
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import os
+import iotests
+import time
+from iotests import qemu_img
+
+disk = os.path.join(iotests.test_dir, 'disk')
+
+size = 0x40000000 # 1G
+sector_size = 512
+granularity = 0x10000
+regions1 = [
+ { 'start': 0, 'count': 0x100000 },
+ { 'start': 0x200000, 'count': 0x100000 }
+ ]
+regions2 = [
+ { 'start': 0x10000000, 'count': 0x20000 },
+ { 'start': 0x39990000, 'count': 0x10000 }
+ ]
+
+class TestPersistentDirtyBitmap(iotests.QMPTestCase):
+
+ def setUp(self):
+ qemu_img('create', '-f', iotests.imgfmt, disk, str(size))
+
+ def mkVm(self, create_bitmap):
+ vm = iotests.VM().add_drive(disk)
+ vm.add_dirty_bitmap('12300000-0000-0000-1230-000001230000', 'drive0', create_bitmap)
+ return vm
+
+ def tearDown(self):
+ os.remove(disk)
+
+ def getMd5(self):
+ result = self.vm.qmp('query-block');
+ return result['return'][0]['dirty-bitmaps'][0]['md5']
+
+ def checkBitmap(self, md5):
+ result = self.vm.qmp('query-block');
+ self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/md5', md5);
+
+ def writeRegions(self, regions):
+ for r in regions:
+ self.vm.hmp_qemu_io('drive0',
+ 'write %d %d' % (r['start'], r['count']))
+
+ def test_persistent(self):
+ self.vm = self.mkVm(True)
+ self.vm.launch()
+
+ self.writeRegions(regions1)
+ md5 = self.getMd5()
+
+ self.vm.shutdown()
+ self.vm = self.mkVm(False)
+ self.vm.launch()
+
+ self.checkBitmap(md5)
+ self.writeRegions(regions2)
+ md5 = self.getMd5()
+
+ self.vm.shutdown()
+ self.vm.launch()
+
+ self.checkBitmap(md5)
+
+ self.vm.shutdown()
+
+ def test_not_exist(self):
+ vm = self.mkVm(False)
+ vm.test_launch()
+
+ def test_already_exists(self):
+ vm = self.mkVm(True)
+ vm.test_launch()
+ vm.test_launch()
+
+ def test_in_use(self):
+ vm = self.mkVm(True)
+ vm.launch()
+ vm.shutdown()
+
+ vm1 = self.mkVm(False)
+ vm1.launch()
+
+ vm2 = self.mkVm(False)
+ vm2.test_launch()
+
+ vm1.shutdown()
+
+
+if __name__ == '__main__':
+ iotests.main()
diff --git a/tests/qemu-iotests/160.out b/tests/qemu-iotests/160.out
new file mode 100644
index 0000000..bb2e6ec
--- /dev/null
+++ b/tests/qemu-iotests/160.out
@@ -0,0 +1,21 @@
+....
+----------------------------------------------------------------------
+Ran 4 tests
+
+OK
+Tast launch successed!
+Test launch failed: 1
+--- qemu output ---
+qemu-system-x86_64: -dirty-bitmap name=12300000-0000-0000-1230-000001230000,node=drive0,create=on: bitmap '12300000-0000-0000-1230-000001230000' already exists
+
+--- end qemu output ---
+Test launch failed: 1
+--- qemu output ---
+qemu-system-x86_64: -dirty-bitmap name=12300000-0000-0000-1230-000001230000,node=drive0,create=off: Bitmap '12300000-0000-0000-1230-000001230000' is in use
+
+--- end qemu output ---
+Test launch failed: 1
+--- qemu output ---
+qemu-system-x86_64: -dirty-bitmap name=12300000-0000-0000-1230-000001230000,node=drive0,create=off: Could not find bitmap '12300000-0000-0000-1230-000001230000' in the node 'drive0'
+
+--- end qemu output ---
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index d6e9219..75342f6 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -142,3 +142,4 @@
138 rw auto quick
139 rw auto quick
142 auto
+160 rw auto quick
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index c879e88..f537b99 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -166,6 +166,12 @@ class VM(object):
self._num_drives += 1
return self
+ def add_dirty_bitmap(self, name, node, create=False):
+ '''Add dirty bitmap parameter to VM cmd'''
+ self._args.append('-dirty-bitmap')
+ self._args.append('name=%s,node=%s,create=%s' % (name, node, 'on' if create else 'off'))
+ return self
+
def pause_drive(self, drive, event=None):
'''Pause drive r/w operations'''
if not event:
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 16/17] qcow2-dirty-bitmap: add AUTO flag
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (14 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 15/17] iotests: test internal persistent dirty bitmap Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 17/17] qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag Vladimir Sementsov-Ogievskiy
` (3 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
The bitmap should be auto-loaded if auto flag is set.
For now, actually, there are no methods to set it.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 8e9fd81..cc104b5 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -40,8 +40,9 @@
#define BME_MAX_NAME_SIZE 1023
/* Bitmap directory entry flags */
-#define BME_RESERVED_FLAGS 0xfffffffe
+#define BME_RESERVED_FLAGS 0xfffffffc
#define BME_FLAG_IN_USE 1
+#define BME_FLAG_AUTO (1U << 1)
/* bits [1, 8] U [56, 63] are reserved */
#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
@@ -50,6 +51,9 @@ typedef enum BitmapType {
BT_DIRTY_TRACKING_BITMAP = 1
} BitmapType;
+static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
+ Error **errp);
+
void qcow2_free_bitmaps(BlockDriverState *bs)
{
BDRVQcow2State *s = bs->opaque;
@@ -213,6 +217,13 @@ static int directory_read(BlockDriverState *bs, Error **errp)
bm->offset = offset;
bm->name = g_strndup((char *)(h + 1), h->name_size);
+ if (h->flags & BME_FLAG_AUTO) {
+ load_bitmap(bs, bm, errp);
+ if (*errp != NULL) {
+ goto fail;
+ }
+ }
+
offset += dir_entry_size(h);
}
return 0;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* [Qemu-devel] [PATCH 17/17] qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (15 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 16/17] qcow2-dirty-bitmap: add AUTO flag Vladimir Sementsov-Ogievskiy
@ 2016-02-17 15:29 ` Vladimir Sementsov-Ogievskiy
2016-02-26 21:41 ` [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps John Snow
` (2 subsequent siblings)
19 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-17 15:29 UTC (permalink / raw)
To: qemu-devel
Cc: kwolf, vsementsov, famz, qemu-block, mreitz, stefanha, pbonzini,
den, jsnow
If this flag is unset and exta data present the bitmap should be
read-only. For now just return error for this case.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2-dirty-bitmap.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index cc104b5..a613565 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -43,6 +43,7 @@
#define BME_RESERVED_FLAGS 0xfffffffc
#define BME_FLAG_IN_USE 1
#define BME_FLAG_AUTO (1U << 1)
+#define BME_FLAG_EXTRA_DATA_COMPATIBLE (1U << 1)
/* bits [1, 8] U [56, 63] are reserved */
#define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
@@ -331,6 +332,13 @@ static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
return NULL;
}
+ if (!(bmh->flags & BME_FLAG_EXTRA_DATA_COMPATIBLE) &&
+ bmh->extra_data_size != 0) {
+ error_setg(errp, "Uncompatible extra data found for bitmap '%s'",
+ bm->name);
+ return NULL;
+ }
+
bitmap_table = g_try_malloc(bmh->bitmap_table_size * sizeof(uint64_t));
if (bitmap_table == NULL) {
error_setg_errno(errp, -ENOMEM,
--
1.8.3.1
^ permalink raw reply related [flat|nested] 23+ messages in thread
* Re: [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (16 preceding siblings ...)
2016-02-17 15:29 ` [Qemu-devel] [PATCH 17/17] qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag Vladimir Sementsov-Ogievskiy
@ 2016-02-26 21:41 ` John Snow
2016-02-29 15:49 ` Vladimir Sementsov-Ogievskiy
2016-03-03 9:10 ` Denis V. Lunev
2016-03-04 18:00 ` John Snow
19 siblings, 1 reply; 23+ messages in thread
From: John Snow @ 2016-02-26 21:41 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel
Cc: kwolf, famz, qemu-block, mreitz, stefanha, den, pbonzini
Do you have this mirrored in a git repo so I can browse it more
effectively? I can't figure out what all the prerequisite patches are,
so it will be convenient to just have a repo in that case for the RFC.
On 02/17/2016 10:28 AM, Vladimir Sementsov-Ogievskiy wrote:
> This series add persistent dirty bitmaps feature to qcow2.
> Specification is in docs/spec/qcow2.txt (not merged yet, see
> [PATCH v10] spec: add qcow2 bitmaps extension specification)
>
> This series are based on Fam's
> [PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
> (meta bitmaps not used, and only hbitmap_deserialize_finish from
> serialization)
>
> This also needs some preparation patches, most of them are in my
> bitmap-migration series. I've not listed them here to keep things
> simpler, this is RFC any way.
>
> v4:
>
> Previous version was posted more than five months ago, so I will not
> carefully list all changes.
>
> What should be noted:
> - some changes are made to sutisfy last version of specification
> - removed staff, related to possibility of saving bitmaps for one
> disk in the other qcow2.
> - to make bitmap store/load zero-copy, I've moved load/store code to
> HBitmap - this is new patch 01.
> so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
> only hbitmap_deserialize_finish, to repair bitmap consistency after
> loading its last level.
> - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
> - some fixes made after John's comments on v3
>
> Vladimir Sementsov-Ogievskiy (17):
> hbitmap: load/store
> qcow2: Bitmaps extension: structs and consts
> qcow2-dirty-bitmap: read dirty bitmap directory
> qcow2-dirty-bitmap: add qcow2_bitmap_load()
> qcow2-dirty-bitmap: add qcow2_bitmap_store()
> qcow2: add dirty bitmaps extension
> qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
> block: store persistent dirty bitmaps
> block: add bdrv_load_dirty_bitmap()
> qcow2-dirty-bitmap: add autoclear bit
> qemu: command line option for dirty bitmaps
> qcow2-dirty-bitmap: add IN_USE flag
> qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
> iotests: add VM.test_launcn()
> iotests: test internal persistent dirty bitmap
> qcow2-dirty-bitmap: add AUTO flag
> qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
>
> block.c | 3 +
> block/Makefile.objs | 2 +-
> block/dirty-bitmap.c | 101 +++++
> block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
> block/qcow2.c | 105 +++++-
> block/qcow2.h | 59 +++
> blockdev.c | 36 ++
> include/block/block_int.h | 9 +
> include/block/dirty-bitmap.h | 21 ++
> include/qemu/hbitmap.h | 12 +
> include/sysemu/blockdev.h | 1 +
> include/sysemu/sysemu.h | 1 +
> qemu-options.hx | 35 ++
> tests/qemu-iotests/160 | 112 ++++++
> tests/qemu-iotests/160.out | 21 ++
> tests/qemu-iotests/group | 1 +
> tests/qemu-iotests/iotests.py | 25 ++
> util/hbitmap.c | 182 +++++++++
> vl.c | 78 ++++
> 19 files changed, 1640 insertions(+), 3 deletions(-)
> create mode 100644 block/qcow2-dirty-bitmap.c
> create mode 100755 tests/qemu-iotests/160
> create mode 100644 tests/qemu-iotests/160.out
>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
2016-02-26 21:41 ` [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps John Snow
@ 2016-02-29 15:49 ` Vladimir Sementsov-Ogievskiy
0 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-02-29 15:49 UTC (permalink / raw)
To: John Snow, qemu-devel
Cc: kwolf, famz, qemu-block, mreitz, stefanha, den, pbonzini
On 27.02.2016 00:41, John Snow wrote:
> Do you have this mirrored in a git repo so I can browse it more
> effectively? I can't figure out what all the prerequisite patches are,
> so it will be convenient to just have a repo in that case for the RFC.
done: https://src.openvz.org/users/vsementsov/repos/qemu/browse
>
> On 02/17/2016 10:28 AM, Vladimir Sementsov-Ogievskiy wrote:
>> This series add persistent dirty bitmaps feature to qcow2.
>> Specification is in docs/spec/qcow2.txt (not merged yet, see
>> [PATCH v10] spec: add qcow2 bitmaps extension specification)
>>
>> This series are based on Fam's
>> [PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
>> (meta bitmaps not used, and only hbitmap_deserialize_finish from
>> serialization)
>>
>> This also needs some preparation patches, most of them are in my
>> bitmap-migration series. I've not listed them here to keep things
>> simpler, this is RFC any way.
>>
>> v4:
>>
>> Previous version was posted more than five months ago, so I will not
>> carefully list all changes.
>>
>> What should be noted:
>> - some changes are made to sutisfy last version of specification
>> - removed staff, related to possibility of saving bitmaps for one
>> disk in the other qcow2.
>> - to make bitmap store/load zero-copy, I've moved load/store code to
>> HBitmap - this is new patch 01.
>> so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
>> only hbitmap_deserialize_finish, to repair bitmap consistency after
>> loading its last level.
>> - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
>> - some fixes made after John's comments on v3
>>
>> Vladimir Sementsov-Ogievskiy (17):
>> hbitmap: load/store
>> qcow2: Bitmaps extension: structs and consts
>> qcow2-dirty-bitmap: read dirty bitmap directory
>> qcow2-dirty-bitmap: add qcow2_bitmap_load()
>> qcow2-dirty-bitmap: add qcow2_bitmap_store()
>> qcow2: add dirty bitmaps extension
>> qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
>> block: store persistent dirty bitmaps
>> block: add bdrv_load_dirty_bitmap()
>> qcow2-dirty-bitmap: add autoclear bit
>> qemu: command line option for dirty bitmaps
>> qcow2-dirty-bitmap: add IN_USE flag
>> qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
>> iotests: add VM.test_launcn()
>> iotests: test internal persistent dirty bitmap
>> qcow2-dirty-bitmap: add AUTO flag
>> qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
>>
>> block.c | 3 +
>> block/Makefile.objs | 2 +-
>> block/dirty-bitmap.c | 101 +++++
>> block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
>> block/qcow2.c | 105 +++++-
>> block/qcow2.h | 59 +++
>> blockdev.c | 36 ++
>> include/block/block_int.h | 9 +
>> include/block/dirty-bitmap.h | 21 ++
>> include/qemu/hbitmap.h | 12 +
>> include/sysemu/blockdev.h | 1 +
>> include/sysemu/sysemu.h | 1 +
>> qemu-options.hx | 35 ++
>> tests/qemu-iotests/160 | 112 ++++++
>> tests/qemu-iotests/160.out | 21 ++
>> tests/qemu-iotests/group | 1 +
>> tests/qemu-iotests/iotests.py | 25 ++
>> util/hbitmap.c | 182 +++++++++
>> vl.c | 78 ++++
>> 19 files changed, 1640 insertions(+), 3 deletions(-)
>> create mode 100644 block/qcow2-dirty-bitmap.c
>> create mode 100755 tests/qemu-iotests/160
>> create mode 100644 tests/qemu-iotests/160.out
>>
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (17 preceding siblings ...)
2016-02-26 21:41 ` [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps John Snow
@ 2016-03-03 9:10 ` Denis V. Lunev
2016-03-04 18:00 ` John Snow
19 siblings, 0 replies; 23+ messages in thread
From: Denis V. Lunev @ 2016-03-03 9:10 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel
Cc: kwolf, famz, qemu-block, jsnow, mreitz, stefanha, pbonzini
On 02/17/2016 06:28 PM, Vladimir Sementsov-Ogievskiy wrote:
> This series add persistent dirty bitmaps feature to qcow2.
> Specification is in docs/spec/qcow2.txt (not merged yet, see
> [PATCH v10] spec: add qcow2 bitmaps extension specification)
>
> This series are based on Fam's
> [PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
> (meta bitmaps not used, and only hbitmap_deserialize_finish from
> serialization)
>
> This also needs some preparation patches, most of them are in my
> bitmap-migration series. I've not listed them here to keep things
> simpler, this is RFC any way.
>
> v4:
>
> Previous version was posted more than five months ago, so I will not
> carefully list all changes.
>
> What should be noted:
> - some changes are made to sutisfy last version of specification
> - removed staff, related to possibility of saving bitmaps for one
> disk in the other qcow2.
> - to make bitmap store/load zero-copy, I've moved load/store code to
> HBitmap - this is new patch 01.
> so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
> only hbitmap_deserialize_finish, to repair bitmap consistency after
> loading its last level.
> - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
> - some fixes made after John's comments on v3
>
> Vladimir Sementsov-Ogievskiy (17):
> hbitmap: load/store
> qcow2: Bitmaps extension: structs and consts
> qcow2-dirty-bitmap: read dirty bitmap directory
> qcow2-dirty-bitmap: add qcow2_bitmap_load()
> qcow2-dirty-bitmap: add qcow2_bitmap_store()
> qcow2: add dirty bitmaps extension
> qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
> block: store persistent dirty bitmaps
> block: add bdrv_load_dirty_bitmap()
> qcow2-dirty-bitmap: add autoclear bit
> qemu: command line option for dirty bitmaps
> qcow2-dirty-bitmap: add IN_USE flag
> qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
> iotests: add VM.test_launcn()
> iotests: test internal persistent dirty bitmap
> qcow2-dirty-bitmap: add AUTO flag
> qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
>
> block.c | 3 +
> block/Makefile.objs | 2 +-
> block/dirty-bitmap.c | 101 +++++
> block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
> block/qcow2.c | 105 +++++-
> block/qcow2.h | 59 +++
> blockdev.c | 36 ++
> include/block/block_int.h | 9 +
> include/block/dirty-bitmap.h | 21 ++
> include/qemu/hbitmap.h | 12 +
> include/sysemu/blockdev.h | 1 +
> include/sysemu/sysemu.h | 1 +
> qemu-options.hx | 35 ++
> tests/qemu-iotests/160 | 112 ++++++
> tests/qemu-iotests/160.out | 21 ++
> tests/qemu-iotests/group | 1 +
> tests/qemu-iotests/iotests.py | 25 ++
> util/hbitmap.c | 182 +++++++++
> vl.c | 78 ++++
> 19 files changed, 1640 insertions(+), 3 deletions(-)
> create mode 100644 block/qcow2-dirty-bitmap.c
> create mode 100755 tests/qemu-iotests/160
> create mode 100644 tests/qemu-iotests/160.out
>
Guys?
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
` (18 preceding siblings ...)
2016-03-03 9:10 ` Denis V. Lunev
@ 2016-03-04 18:00 ` John Snow
2016-03-05 12:26 ` Vladimir Sementsov-Ogievskiy
19 siblings, 1 reply; 23+ messages in thread
From: John Snow @ 2016-03-04 18:00 UTC (permalink / raw)
To: Vladimir Sementsov-Ogievskiy, qemu-devel
Cc: kwolf, famz, qemu-block, mreitz, stefanha, den, pbonzini
On 02/17/2016 10:28 AM, Vladimir Sementsov-Ogievskiy wrote:
> This series add persistent dirty bitmaps feature to qcow2.
> Specification is in docs/spec/qcow2.txt (not merged yet, see
> [PATCH v10] spec: add qcow2 bitmaps extension specification)
>
> This series are based on Fam's
> [PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
> (meta bitmaps not used, and only hbitmap_deserialize_finish from
> serialization)
>
> This also needs some preparation patches, most of them are in my
> bitmap-migration series. I've not listed them here to keep things
> simpler, this is RFC any way.
>
> v4:
>
> Previous version was posted more than five months ago, so I will not
> carefully list all changes.
>
> What should be noted:
> - some changes are made to sutisfy last version of specification
> - removed staff, related to possibility of saving bitmaps for one
> disk in the other qcow2.
> - to make bitmap store/load zero-copy, I've moved load/store code to
> HBitmap - this is new patch 01.
> so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
> only hbitmap_deserialize_finish, to repair bitmap consistency after
> loading its last level.
> - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
> - some fixes made after John's comments on v3
>
> Vladimir Sementsov-Ogievskiy (17):
> hbitmap: load/store
> qcow2: Bitmaps extension: structs and consts
> qcow2-dirty-bitmap: read dirty bitmap directory
> qcow2-dirty-bitmap: add qcow2_bitmap_load()
> qcow2-dirty-bitmap: add qcow2_bitmap_store()
> qcow2: add dirty bitmaps extension
> qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
> block: store persistent dirty bitmaps
> block: add bdrv_load_dirty_bitmap()
> qcow2-dirty-bitmap: add autoclear bit
> qemu: command line option for dirty bitmaps
> qcow2-dirty-bitmap: add IN_USE flag
> qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
> iotests: add VM.test_launcn()
> iotests: test internal persistent dirty bitmap
> qcow2-dirty-bitmap: add AUTO flag
> qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
>
> block.c | 3 +
> block/Makefile.objs | 2 +-
> block/dirty-bitmap.c | 101 +++++
> block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
> block/qcow2.c | 105 +++++-
> block/qcow2.h | 59 +++
> blockdev.c | 36 ++
> include/block/block_int.h | 9 +
> include/block/dirty-bitmap.h | 21 ++
> include/qemu/hbitmap.h | 12 +
> include/sysemu/blockdev.h | 1 +
> include/sysemu/sysemu.h | 1 +
> qemu-options.hx | 35 ++
> tests/qemu-iotests/160 | 112 ++++++
> tests/qemu-iotests/160.out | 21 ++
> tests/qemu-iotests/group | 1 +
> tests/qemu-iotests/iotests.py | 25 ++
> util/hbitmap.c | 182 +++++++++
> vl.c | 78 ++++
> 19 files changed, 1640 insertions(+), 3 deletions(-)
> create mode 100644 block/qcow2-dirty-bitmap.c
> create mode 100755 tests/qemu-iotests/160
> create mode 100644 tests/qemu-iotests/160.out
>
In your prerequisite patches,
"iotests-add-default-node-name" breaks qemu iotests 055 and 118. Didn't
look hard enough to find out why, yet.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps
2016-03-04 18:00 ` John Snow
@ 2016-03-05 12:26 ` Vladimir Sementsov-Ogievskiy
0 siblings, 0 replies; 23+ messages in thread
From: Vladimir Sementsov-Ogievskiy @ 2016-03-05 12:26 UTC (permalink / raw)
To: John Snow, qemu-devel
Cc: kwolf, famz, qemu-block, mreitz, stefanha, den, pbonzini
On 04.03.2016 21:00, John Snow wrote:
>
> On 02/17/2016 10:28 AM, Vladimir Sementsov-Ogievskiy wrote:
>> This series add persistent dirty bitmaps feature to qcow2.
>> Specification is in docs/spec/qcow2.txt (not merged yet, see
>> [PATCH v10] spec: add qcow2 bitmaps extension specification)
>>
>> This series are based on Fam's
>> [PATCH v2 00/13] Dirty bitmap changes for migration/persistence work
>> (meta bitmaps not used, and only hbitmap_deserialize_finish from
>> serialization)
>>
>> This also needs some preparation patches, most of them are in my
>> bitmap-migration series. I've not listed them here to keep things
>> simpler, this is RFC any way.
>>
>> v4:
>>
>> Previous version was posted more than five months ago, so I will not
>> carefully list all changes.
>>
>> What should be noted:
>> - some changes are made to sutisfy last version of specification
>> - removed staff, related to possibility of saving bitmaps for one
>> disk in the other qcow2.
>> - to make bitmap store/load zero-copy, I've moved load/store code to
>> HBitmap - this is new patch 01.
>> so, bdrv_dirty_bitmap_serialize_part and friends are not needed,
>> only hbitmap_deserialize_finish, to repair bitmap consistency after
>> loading its last level.
>> - two patches added about AUTO and EXTRA_DATA_COMPATIBLE flags
>> - some fixes made after John's comments on v3
>>
>> Vladimir Sementsov-Ogievskiy (17):
>> hbitmap: load/store
>> qcow2: Bitmaps extension: structs and consts
>> qcow2-dirty-bitmap: read dirty bitmap directory
>> qcow2-dirty-bitmap: add qcow2_bitmap_load()
>> qcow2-dirty-bitmap: add qcow2_bitmap_store()
>> qcow2: add dirty bitmaps extension
>> qcow2-dirty-bitmap: add qcow2_bitmap_load_check()
>> block: store persistent dirty bitmaps
>> block: add bdrv_load_dirty_bitmap()
>> qcow2-dirty-bitmap: add autoclear bit
>> qemu: command line option for dirty bitmaps
>> qcow2-dirty-bitmap: add IN_USE flag
>> qcow2-dirty-bitmaps: disallow stroing bitmap to other bs
>> iotests: add VM.test_launcn()
>> iotests: test internal persistent dirty bitmap
>> qcow2-dirty-bitmap: add AUTO flag
>> qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag
>>
>> block.c | 3 +
>> block/Makefile.objs | 2 +-
>> block/dirty-bitmap.c | 101 +++++
>> block/qcow2-dirty-bitmap.c | 839 ++++++++++++++++++++++++++++++++++++++++++
>> block/qcow2.c | 105 +++++-
>> block/qcow2.h | 59 +++
>> blockdev.c | 36 ++
>> include/block/block_int.h | 9 +
>> include/block/dirty-bitmap.h | 21 ++
>> include/qemu/hbitmap.h | 12 +
>> include/sysemu/blockdev.h | 1 +
>> include/sysemu/sysemu.h | 1 +
>> qemu-options.hx | 35 ++
>> tests/qemu-iotests/160 | 112 ++++++
>> tests/qemu-iotests/160.out | 21 ++
>> tests/qemu-iotests/group | 1 +
>> tests/qemu-iotests/iotests.py | 25 ++
>> util/hbitmap.c | 182 +++++++++
>> vl.c | 78 ++++
>> 19 files changed, 1640 insertions(+), 3 deletions(-)
>> create mode 100644 block/qcow2-dirty-bitmap.c
>> create mode 100755 tests/qemu-iotests/160
>> create mode 100644 tests/qemu-iotests/160.out
>>
> In your prerequisite patches,
>
> "iotests-add-default-node-name" breaks qemu iotests 055 and 118. Didn't
> look hard enough to find out why, yet.
118 doesn't work for me anyway (./check -qcow2 118 , yes?), for 055 you
are right, it's not hard, the following helps:
def add_drive(self, path, opts='', interface='virtio'):
'''Add a virtio-blk drive to the VM'''
options = ['if=%s' % interface,
- 'id=drive%d' % self._num_drives,
- 'node-name=drivenode%d' % self._num_drives]
+ 'id=drive%d' % self._num_drives]
if path is not None:
+ options.append('node-name=drivenode%d' % self._num_drives)
options.append('file=%s' % path)
options.append('format=%s' % imgfmt)
options.append('cache=%s' % cachemode)
--
Best regards,
Vladimir
^ permalink raw reply [flat|nested] 23+ messages in thread
end of thread, other threads:[~2016-03-05 12:27 UTC | newest]
Thread overview: 23+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-02-17 15:28 [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 01/17] hbitmap: load/store Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 02/17] qcow2: Bitmaps extension: structs and consts Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 03/17] qcow2-dirty-bitmap: read dirty bitmap directory Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 04/17] qcow2-dirty-bitmap: add qcow2_bitmap_load() Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 05/17] qcow2-dirty-bitmap: add qcow2_bitmap_store() Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 06/17] qcow2: add dirty bitmaps extension Vladimir Sementsov-Ogievskiy
2016-02-17 15:28 ` [Qemu-devel] [PATCH 07/17] qcow2-dirty-bitmap: add qcow2_bitmap_load_check() Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 08/17] block: store persistent dirty bitmaps Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 09/17] block: add bdrv_load_dirty_bitmap() Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 10/17] qcow2-dirty-bitmap: add autoclear bit Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 11/17] qemu: command line option for dirty bitmaps Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 12/17] qcow2-dirty-bitmap: add IN_USE flag Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 13/17] qcow2-dirty-bitmaps: disallow stroing bitmap to other bs Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 14/17] iotests: add VM.test_launcn() Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 15/17] iotests: test internal persistent dirty bitmap Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 16/17] qcow2-dirty-bitmap: add AUTO flag Vladimir Sementsov-Ogievskiy
2016-02-17 15:29 ` [Qemu-devel] [PATCH 17/17] qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag Vladimir Sementsov-Ogievskiy
2016-02-26 21:41 ` [Qemu-devel] [PATCH v4 RFC 00/17] qcow2: persistent dirty bitmaps John Snow
2016-02-29 15:49 ` Vladimir Sementsov-Ogievskiy
2016-03-03 9:10 ` Denis V. Lunev
2016-03-04 18:00 ` John Snow
2016-03-05 12:26 ` Vladimir Sementsov-Ogievskiy
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