diff mbox

[RESEND,07/17] block: Add bitmap disabled status

Message ID 1425084477-31602-8-git-send-email-jsnow@redhat.com
State New
Headers show

Commit Message

John Snow Feb. 28, 2015, 12:47 a.m. UTC 
Add a status indicating the enabled/disabled state of the bitmap.
A bitmap is by default enabled, but you can lock the bitmap into
a read-only state by setting disabled = true.

A previous version of this patch added a QMP interface for changing
the state of the bitmap, but it has since been removed for now until
a use case emerges where this state must be revealed to the user.

The disabled state WILL be used internally for bitmap migration and
bitmap persistence.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
---
 block.c               | 25 +++++++++++++++++++++++++
 include/block/block.h |  3 +++
 2 files changed, 28 insertions(+)

Comments

Max Reitz March 2, 2015, 5:08 p.m. UTC | #1 
On 2015-02-27 at 19:47, John Snow wrote:
> Add a status indicating the enabled/disabled state of the bitmap.
> A bitmap is by default enabled, but you can lock the bitmap into
> a read-only state by setting disabled = true.
>
> A previous version of this patch added a QMP interface for changing
> the state of the bitmap, but it has since been removed for now until
> a use case emerges where this state must be revealed to the user.
>
> The disabled state WILL be used internally for bitmap migration and
> bitmap persistence.
>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>   block.c               | 25 +++++++++++++++++++++++++
>   include/block/block.h |  3 +++
>   2 files changed, 28 insertions(+)

Reviewed-by: Max Reitz <mreitz@redhat.com>
diff mbox

Patch

diff --git a/block.c b/block.c
index 9a82826..7e71aba 100644
--- a/block.c
+++ b/block.c
@@ -54,6 +54,7 @@ 
 struct BdrvDirtyBitmap {
     HBitmap *bitmap;
     char *name;
+    bool disabled;
     QLIST_ENTRY(BdrvDirtyBitmap) list;
 };
 
@@ -5450,10 +5451,16 @@  BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
     bitmap = g_new0(BdrvDirtyBitmap, 1);
     bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(sector_granularity) - 1);
     bitmap->name = g_strdup(name);
+    bitmap->disabled = false;
     QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);
     return bitmap;
 }
 
+bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap)
+{
+    return !bitmap->disabled;
+}
+
 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
 {
     BdrvDirtyBitmap *bm, *next;
@@ -5468,6 +5475,16 @@  void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
     }
 }
 
+void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
+{
+    bitmap->disabled = true;
+}
+
+void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
+{
+    bitmap->disabled = false;
+}
+
 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
 {
     BdrvDirtyBitmap *bm;
@@ -5532,12 +5549,14 @@  void bdrv_dirty_iter_init(BlockDriverState *bs,
 void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
                            int64_t cur_sector, int nr_sectors)
 {
+    assert(bdrv_dirty_bitmap_enabled(bitmap));
     hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
 }
 
 void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
                              int64_t cur_sector, int nr_sectors)
 {
+    assert(bdrv_dirty_bitmap_enabled(bitmap));
     hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
 }
 
@@ -5546,6 +5565,9 @@  static void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector,
 {
     BdrvDirtyBitmap *bitmap;
     QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
+        if (!bdrv_dirty_bitmap_enabled(bitmap)) {
+            continue;
+        }
         hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors);
     }
 }
@@ -5555,6 +5577,9 @@  static void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
 {
     BdrvDirtyBitmap *bitmap;
     QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
+        if (!bdrv_dirty_bitmap_enabled(bitmap)) {
+            continue;
+        }
         hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors);
     }
 }
diff --git a/include/block/block.h b/include/block/block.h
index 2a11fbc..879a3af 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -458,9 +458,12 @@  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);
+void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
+void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs);
 uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap);
+bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap);
 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
                            int64_t cur_sector, int nr_sectors);