This field will be set for user created dirty bitmap. Also pass in an
error pointer to bdrv_create_dirty_bitmap, so when a name is already
taken on this BDS, it can report an error message. This is not global
check, two BDSes can have dirty bitmap with a common name.
Implemented bdrv_find_dirty_bitmap to find a dirty bitmap by name, will
be used later when other QMP commands want to reference dirty bitmap by
name.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
block-migration.c | 3 ++-
block.c | 29 ++++++++++++++++++++++++++++-
block/mirror.c | 2 +-
include/block/block.h | 7 ++++++-
qapi-schema.json | 4 +++-
5 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/block-migration.c b/block-migration.c
index 897fdba..e6e016a 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -315,7 +315,8 @@ static void set_dirty_tracking(void)
BlkMigDevState *bmds;
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
- bmds->dirty_bitmap = bdrv_create_dirty_bitmap(bmds->bs, BLOCK_SIZE);
+ bmds->dirty_bitmap = bdrv_create_dirty_bitmap(bmds->bs, BLOCK_SIZE,
+ NULL, NULL);
}
}
diff --git a/block.c b/block.c
index 6ad0368..16ef61b 100644
--- a/block.c
+++ b/block.c
@@ -52,6 +52,7 @@
struct BdrvDirtyBitmap {
HBitmap *bitmap;
int refcnt;
+ char name[1024];
QLIST_ENTRY(BdrvDirtyBitmap) list;
};
@@ -4532,19 +4533,43 @@ bool bdrv_qiov_is_aligned(BlockDriverState *bs,
QEMUIOVector *qiov)
return true;
}
-BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int
granularity)
+BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs,
+ const char *name)
+{
+ BdrvDirtyBitmap *bm;
+ QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
+ if (!strcmp(name, bm->name)) {
+ return bm;
+ }
+ }
+ return NULL;
+}
+
+BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
+ int granularity,
+ const char *name,
+ Error **errp)
{
int64_t bitmap_size;
BdrvDirtyBitmap *bitmap;
assert((granularity & (granularity - 1)) == 0);
+ if (name && bdrv_find_dirty_bitmap(bs, name)) {
+ if (errp) {
+ error_setg(errp, "Bitmap already exists: %s", name);
+ }
+ return NULL;
+ }
granularity >>= BDRV_SECTOR_BITS;
assert(granularity);
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS);
bitmap = g_malloc0(sizeof(BdrvDirtyBitmap));
bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1);
bitmap->refcnt = 1;
+ if (name) {
+ pstrcpy(bitmap->name, sizeof(bitmap->name), name);
+ }
QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
return bitmap;
}
@@ -4583,6 +4608,8 @@ BlockDirtyInfoList
*bdrv_query_dirty_bitmaps(BlockDriverState *bs)
info->count = bdrv_get_dirty_count(bs, bm);
info->granularity =
((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap));
+ info->has_name = bm->name[0] != '\0';
+ info->name = g_strdup(bm->name);
entry->value = info;
*plist = entry;
plist = &entry->next;
diff --git a/block/mirror.c b/block/mirror.c
index 2932bab..cc0665b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -598,7 +598,7 @@ static void mirror_start_job(BlockDriverState *bs,
BlockDriverState *target,
s->granularity = granularity;
s->buf_size = MAX(buf_size, granularity);
- s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity);
+ s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
bdrv_set_enable_write_cache(s->target, true);
bdrv_set_on_error(s->target, on_target_error, on_target_error);
bdrv_iostatus_enable(s->target);
diff --git a/include/block/block.h b/include/block/block.h
index 0c776e3..8dafa42 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -424,7 +424,12 @@ bool bdrv_qiov_is_aligned(BlockDriverState *bs,
QEMUIOVector *qiov);
struct HBitmapIter;
typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
-BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int
granularity);
+BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
+ int granularity,
+ const char *name,
+ Error **errp);
+BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs,
+ const char *name);
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
void bdrv_reference_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap
*bitmap);
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
diff --git a/qapi-schema.json b/qapi-schema.json
index b9b051c..e91143a 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -920,6 +920,8 @@
#
# Block dirty bitmap information.
#
+# @name: the name of dirty bitmap
+#
# @count: number of dirty bytes according to the dirty bitmap
#
# @granularity: granularity of the dirty bitmap in bytes (since 1.4)
@@ -927,7 +929,7 @@
# Since: 1.3
##
{ 'type': 'BlockDirtyInfo',
- 'data': {'count': 'int', 'granularity': 'int'} }
+ 'data': {'*name': 'str', 'count': 'int', 'granularity': 'int'} }
##
# @BlockInfo:
--
1.8.5.2
