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rCDQYyakH2tJNQgkXkeLodBKF4bHiBbuwj0E39S9wmGgg+q4OTnAO/yhQGknle7a7G5xHBwE i0HjnLoJP5jDcoMTabZTIazXmJz3pKM11HYJ5/ZsTIf3ZRJJKIvXJpbmcAPVwTZII6XxiJdh RSSX4Mvd5pL/+5WI6NTdW6DMfigTtdd85fe6PwBNVJL2ZvBfsBJZ5rxg1TOH3KLsYBqBTgW2 glQofxhkJhDEcvjLhe3Y2BlbCWKOmvM8XS9TRt0OwUs= Message-ID: <1e937a40-5ce2-467a-a50b-e8f822f2dcdc@redhat.com> Date: Fri, 7 Jun 2019 18:39:44 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190603120005.37394-3-vsementsov@virtuozzo.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Fri, 07 Jun 2019 22:39:51 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 2/4] block/dirty-bitmap: add hide/unhide API X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, fam@euphon.net, armbru@redhat.com, mreitz@redhat.com, nshirokovskiy@virtuozzo.com, den@openvz.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/3/19 8:00 AM, Vladimir Sementsov-Ogievskiy wrote: > Add functionality to make bitmap temporary anonymous. It will be used > to implement bitmap remove transaction action. We need hide bitmap > persistence too, as there are should not be unnamed persistent bitmaps. > Ah, so this effectively ... "hides" a bitmap from any further transaction actions. It also "hides" it from getting flushed to disk... sort of? The outer loop in store works with bdrv_dirty_bitmap_next, and we'll skip this bitmap because it's anonymous/not persistent. There's a second loop where we iterate bm_list, and we'll skip storing this bitmap because that entry won't have an in-memory bitmap associated with it in bm_list. ...But then we'll call update_ext_header_and_dir with the stale entries in bm_list? > Signed-off-by: Vladimir Sementsov-Ogievskiy > --- > include/block/dirty-bitmap.h | 2 ++ > block/dirty-bitmap.c | 26 ++++++++++++++++++++++++++ > 2 files changed, 28 insertions(+) > > diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h > index 8044ace63e..542e437123 100644 > --- a/include/block/dirty-bitmap.h > +++ b/include/block/dirty-bitmap.h > @@ -116,5 +116,7 @@ bool bdrv_dirty_bitmap_next_dirty_area(BdrvDirtyBitmap *bitmap, > BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs, > BdrvDirtyBitmap *bitmap, > Error **errp); > +void bdrv_dirty_bitmap_hide(BdrvDirtyBitmap *bitmap); > +void bdrv_dirty_bitmap_unhide(BdrvDirtyBitmap *bitmap); > > #endif > diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c > index 49646a30e6..592964635e 100644 > --- a/block/dirty-bitmap.c > +++ b/block/dirty-bitmap.c > @@ -35,6 +35,10 @@ struct BdrvDirtyBitmap { > bool busy; /* Bitmap is busy, it can't be used via QMP */ > BdrvDirtyBitmap *successor; /* Anonymous child, if any. */ > char *name; /* Optional non-empty unique ID */ > + char *hidden_name; /* Backup of @name for removal transaction > + action. Used for hide/unhide API. */ > + bool hidden_persistent; /* Backup of @persistent for removal transaction > + action. */ > int64_t size; /* Size of the bitmap, in bytes */ > bool disabled; /* Bitmap is disabled. It ignores all writes to > the device */ > @@ -849,3 +853,25 @@ out: > qemu_mutex_unlock(src->mutex); > } > } > + > +void bdrv_dirty_bitmap_hide(BdrvDirtyBitmap *bitmap) > +{ > + qemu_mutex_lock(bitmap->mutex); > + assert(!bitmap->hidden_name); > + bitmap->hidden_name = bitmap->name; > + bitmap->hidden_persistent = bitmap->persistent; > + bitmap->name = NULL; > + bitmap->persistent = false; > + qemu_mutex_unlock(bitmap->mutex); > +} > + > +void bdrv_dirty_bitmap_unhide(BdrvDirtyBitmap *bitmap) > +{ > + qemu_mutex_lock(bitmap->mutex); > + assert(!bitmap->name); > + bitmap->name = bitmap->hidden_name; > + bitmap->persistent = bitmap->hidden_persistent; > + bitmap->hidden_name = NULL; > + bitmap->hidden_persistent = false; > + qemu_mutex_unlock(bitmap->mutex); > +} >