From patchwork Mon Jan 4 10:27:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 562308 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id C78691402DE for ; Mon, 4 Jan 2016 21:29:59 +1100 (AEDT) Received: from localhost ([::1]:44442 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aG2Oj-0000mG-IV for incoming@patchwork.ozlabs.org; Mon, 04 Jan 2016 05:29:57 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50018) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aG2Mp-0005RI-O7 for qemu-devel@nongnu.org; Mon, 04 Jan 2016 05:28:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aG2Mm-00037k-IJ for qemu-devel@nongnu.org; Mon, 04 Jan 2016 05:27:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35969) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aG2Mk-00037P-1H; Mon, 04 Jan 2016 05:27:54 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id B0AE2744; Mon, 4 Jan 2016 10:27:53 +0000 (UTC) Received: from fam-t430.redhat.com (vpn1-7-191.pek2.redhat.com [10.72.7.191]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u04ARFbD004068; Mon, 4 Jan 2016 05:27:48 -0500 From: Fam Zheng To: qemu-devel@nongnu.org Date: Mon, 4 Jan 2016 18:27:09 +0800 Message-Id: <1451903234-32529-9-git-send-email-famz@redhat.com> In-Reply-To: <1451903234-32529-1-git-send-email-famz@redhat.com> References: <1451903234-32529-1-git-send-email-famz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Kevin Wolf , Jeff Cody , Vladimir Sementsov-Ogievskiy , jsnow@redhat.com, qemu-block@nongnu.org Subject: [Qemu-devel] [PATCH 08/13] block: Support meta dirty bitmap X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The added group of operations enables tracking of the changed bits in the dirty bitmap. Signed-off-by: Fam Zheng --- block/dirty-bitmap.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ include/block/dirty-bitmap.h | 9 ++++++++ 2 files changed, 60 insertions(+) diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index 53cf88d..4314659 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -37,6 +37,7 @@ */ struct BdrvDirtyBitmap { HBitmap *bitmap; /* Dirty sector bitmap implementation */ + HBitmap *meta; /* Meta dirty bitmap */ BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ char *name; /* Optional non-empty unique ID */ int64_t size; /* Size of the bitmap (Number of sectors) */ @@ -102,6 +103,56 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, return bitmap; } +/* bdrv_create_meta_dirty_bitmap + * + * Create a meta dirty bitmap that tracks the changes of bits in @bitmap. I.e. + * when a dirty status bit in @bitmap is changed (either from reset to set or + * the other way around), its respective meta dirty bitmap bit will be marked + * dirty as well. + * + * @bitmap: the block dirty bitmap for which to create a meta dirty bitmap. + * @granularity: how many bytes of bitmap data does each bit in the meta bitmap + * track. + */ +void bdrv_create_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap, + int granularity) +{ + assert(!bitmap->meta); + bitmap->meta = hbitmap_create_meta(bitmap->bitmap, + BDRV_SECTOR_SIZE * BITS_PER_BYTE); +} + +void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap) +{ + assert(bitmap->meta); + hbitmap_free(bitmap->meta); + bitmap->meta = NULL; +} + +int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs, + BdrvDirtyBitmap *bitmap, int64_t sector, + int nb_sectors) +{ + uint64_t i; + int gran = bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS; + + /* To optimize: we can make hbitmap to internally check the range in a + * coarse level, or at least do it word by word. */ + for (i = sector; i < sector + nb_sectors; i += gran) { + if (hbitmap_get(bitmap->meta, i)) { + return true; + } + } + return false; +} + +void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs, + BdrvDirtyBitmap *bitmap, int64_t sector, + int nb_sectors) +{ + hbitmap_reset(bitmap->meta, sector, nb_sectors); +} + bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) { return bitmap->successor; diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h index 16bb15a..0715220 100644 --- a/include/block/dirty-bitmap.h +++ b/include/block/dirty-bitmap.h @@ -8,6 +8,9 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, uint32_t granularity, const char *name, Error **errp); +void bdrv_create_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap, + int granularity); +void bdrv_release_meta_dirty_bitmap(BdrvDirtyBitmap *bitmap); int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, Error **errp); @@ -34,6 +37,12 @@ void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, int64_t cur_sector, int nr_sectors); void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, int64_t cur_sector, int nr_sectors); +int bdrv_dirty_bitmap_get_meta(BlockDriverState *bs, + BdrvDirtyBitmap *bitmap, int64_t sector, + int nb_sectors); +void bdrv_dirty_bitmap_reset_meta(BlockDriverState *bs, + BdrvDirtyBitmap *bitmap, int64_t sector, + int nb_sectors); BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap, uint64_t first_sector); void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter);