qapi: Add optional field "name" to block dirty bitmap

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.

Add bdrv_dirty_bitmap_make_anon. This unsets the name of dirty bitmap.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1429314609-29776-3-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

@@ -54,6 +54,7 @@
 
 struct BdrvDirtyBitmap {
     HBitmap *bitmap;
+    char *name;
     QLIST_ENTRY(BdrvDirtyBitmap) list;
 };
 
@@ -5501,7 +5502,28 @@ 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;
+
+    assert(name);
+    QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
+        if (bm->name && !strcmp(name, bm->name)) {
+            return bm;
+        }
+    }
+    return NULL;
+}
+
+void bdrv_dirty_bitmap_make_anon(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
+{
+    g_free(bitmap->name);
+    bitmap->name = NULL;
+}
+
+BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
+                                          int granularity,
+                                          const char *name,
                                           Error **errp)
 {
     int64_t bitmap_size;
@@ -5509,6 +5531,10 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
 
     assert((granularity & (granularity - 1)) == 0);
 
+    if (name && bdrv_find_dirty_bitmap(bs, name)) {
+        error_setg(errp, "Bitmap already exists: %s", name);
+        return NULL;
+    }
     granularity >>= BDRV_SECTOR_BITS;
     assert(granularity);
     bitmap_size = bdrv_nb_sectors(bs);
@@ -5519,6 +5545,7 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
     }
     bitmap = g_new0(BdrvDirtyBitmap, 1);
     bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(granularity));
+    bitmap->name = g_strdup(name);
     QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
     return bitmap;
 }
@@ -5530,6 +5557,7 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
         if (bm == bitmap) {
             QLIST_REMOVE(bitmap, list);
             hbitmap_free(bitmap->bitmap);
+            g_free(bitmap->name);
             g_free(bitmap);
             return;
         }
@@ -5548,6 +5576,8 @@ 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;
+        info->name = g_strdup(bm->name);
         entry->value = info;
         *plist = entry;
         plist = &entry->next;

block/mirror.c

@@ -703,7 +703,7 @@ 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, errp);
+    s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
     if (!s->dirty_bitmap) {
         return;
     }

include/block/block.h

@@ -450,8 +450,13 @@ 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_dirty_bitmap_make_anon(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);

migration/block.c

@@ -320,7 +320,7 @@ static int set_dirty_tracking(void)
 
     QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
         bmds->dirty_bitmap = bdrv_create_dirty_bitmap(bmds->bs, BLOCK_SIZE,
-                                                      NULL);
+                                                      NULL, NULL);
         if (!bmds->dirty_bitmap) {
             ret = -errno;
             goto fail;

qapi/block-core.json

@@ -330,6 +330,8 @@
 #
 # Block dirty bitmap information.
 #
+# @name: #optional the name of the dirty bitmap (Since 2.4)
+#
 # @count: number of dirty bytes according to the dirty bitmap
 #
 # @granularity: granularity of the dirty bitmap in bytes (since 1.4)
@@ -337,7 +339,7 @@
 # Since: 1.3
 ##
 { 'type': 'BlockDirtyInfo',
-  'data': {'count': 'int', 'granularity': 'int'} }
+  'data': {'*name': 'str', 'count': 'int', 'granularity': 'int'} }
 
 ##
 # @BlockInfo: