From patchwork Sat Feb 27 09:20:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 8444011 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8D030C0553 for ; Sat, 27 Feb 2016 09:25:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9CCF820375 for ; Sat, 27 Feb 2016 09:25:18 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7C42F20303 for ; Sat, 27 Feb 2016 09:25:17 +0000 (UTC) Received: from localhost ([::1]:54048 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZb7k-0006E3-Oq for patchwork-qemu-devel@patchwork.kernel.org; Sat, 27 Feb 2016 04:25:16 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51207) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZb4B-0008KJ-9e for qemu-devel@nongnu.org; Sat, 27 Feb 2016 04:21:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aZb47-0005MK-SJ for qemu-devel@nongnu.org; Sat, 27 Feb 2016 04:21:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51970) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZb44-0005Gt-G0; Sat, 27 Feb 2016 04:21:28 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 34045218F; Sat, 27 Feb 2016 09:21:28 +0000 (UTC) Received: from fam-t430.redhat.com (vpn1-4-159.pek2.redhat.com [10.72.4.159]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1R9Kwhv028695; Sat, 27 Feb 2016 04:21:25 -0500 From: Fam Zheng To: qemu-devel@nongnu.org Date: Sat, 27 Feb 2016 17:20:48 +0800 Message-Id: <1456564857-29160-7-git-send-email-famz@redhat.com> In-Reply-To: <1456564857-29160-1-git-send-email-famz@redhat.com> References: <1456564857-29160-1-git-send-email-famz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org Subject: [Qemu-devel] [PATCH v3 06/15] block: Hide HBitmap in block dirty bitmap interface 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP HBitmap is an implementation detail of block dirty bitmap that should be hidden from users. Introduce a BdrvDirtyBitmapIter to encapsulate the underlying HBitmapIter. A small difference in the interface is, before, an HBitmapIter is initialized in place, now the new BdrvDirtyBitmapIter must be dynamically allocated because the structure definition is in block.c. Two current users are converted too. Signed-off-by: Fam Zheng Reviewed-by: John Snow --- block/backup.c | 14 ++++++++------ block/dirty-bitmap.c | 39 +++++++++++++++++++++++++++++++++------ block/mirror.c | 14 ++++++++------ include/block/dirty-bitmap.h | 7 +++++-- include/qemu/typedefs.h | 1 + 5 files changed, 55 insertions(+), 20 deletions(-) diff --git a/block/backup.c b/block/backup.c index c6c1b81..16ce6ad 100644 --- a/block/backup.c +++ b/block/backup.c @@ -324,14 +324,14 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) int64_t end; int64_t last_cluster = -1; BlockDriverState *bs = job->common.bs; - HBitmapIter hbi; + BdrvDirtyBitmapIter *dbi; granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap); clusters_per_iter = MAX((granularity / BACKUP_CLUSTER_SIZE), 1); - bdrv_dirty_iter_init(job->sync_bitmap, &hbi); + dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0); /* Find the next dirty sector(s) */ - while ((sector = hbitmap_iter_next(&hbi)) != -1) { + while ((sector = bdrv_dirty_iter_next(dbi)) != -1) { cluster = sector / BACKUP_SECTORS_PER_CLUSTER; /* Fake progress updates for any clusters we skipped */ @@ -343,7 +343,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) for (end = cluster + clusters_per_iter; cluster < end; cluster++) { do { if (yield_and_check(job)) { - return ret; + goto out; } ret = backup_do_cow(bs, cluster * BACKUP_SECTORS_PER_CLUSTER, BACKUP_SECTORS_PER_CLUSTER, &error_is_read, @@ -351,7 +351,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) if ((ret < 0) && backup_error_action(job, error_is_read, -ret) == BLOCK_ERROR_ACTION_REPORT) { - return ret; + goto out; } } while (ret < 0); } @@ -359,7 +359,7 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) /* If the bitmap granularity is smaller than the backup granularity, * we need to advance the iterator pointer to the next cluster. */ if (granularity < BACKUP_CLUSTER_SIZE) { - bdrv_set_dirty_iter(&hbi, cluster * BACKUP_SECTORS_PER_CLUSTER); + bdrv_set_dirty_iter(dbi, cluster * BACKUP_SECTORS_PER_CLUSTER); } last_cluster = cluster - 1; @@ -371,6 +371,8 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job) job->common.offset += ((end - last_cluster - 1) * BACKUP_CLUSTER_SIZE); } +out: + bdrv_dirty_iter_free(dbi); return ret; } diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index 556e1d1..16f73b2 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -42,9 +42,15 @@ struct BdrvDirtyBitmap { char *name; /* Optional non-empty unique ID */ int64_t size; /* Size of the bitmap (Number of sectors) */ bool disabled; /* Bitmap is read-only */ + int active_iterators; /* How many iterators are active */ QLIST_ENTRY(BdrvDirtyBitmap) list; }; +struct BdrvDirtyBitmapIter { + HBitmapIter hbi; + BdrvDirtyBitmap *bitmap; +}; + BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) { BdrvDirtyBitmap *bm; @@ -212,6 +218,7 @@ void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { assert(!bdrv_dirty_bitmap_frozen(bitmap)); + assert(!bitmap->active_iterators); hbitmap_truncate(bitmap->bitmap, size); bitmap->size = size; } @@ -224,6 +231,7 @@ static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bm, *next; QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) { + assert(!bitmap->active_iterators); assert(!bdrv_dirty_bitmap_frozen(bm)); QLIST_REMOVE(bm, list); hbitmap_free(bm->bitmap); @@ -320,9 +328,29 @@ uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); } -void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) +BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap, + uint64_t first_sector) { - hbitmap_iter_init(hbi, bitmap->bitmap, 0); + BdrvDirtyBitmapIter *iter = g_new(BdrvDirtyBitmapIter, 1); + hbitmap_iter_init(&iter->hbi, bitmap->bitmap, first_sector); + iter->bitmap = bitmap; + bitmap->active_iterators++; + return iter; +} + +void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter) +{ + if (!iter) { + return; + } + assert(iter->bitmap->active_iterators > 0); + iter->bitmap->active_iterators--; + g_free(iter); +} + +int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter) +{ + return hbitmap_iter_next(&iter->hbi); } void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, @@ -373,12 +401,11 @@ void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, } /** - * Advance an HBitmapIter to an arbitrary offset. + * Advance an BdrvDirtyBitmapIter to an arbitrary offset. */ -void bdrv_set_dirty_iter(HBitmapIter *hbi, int64_t offset) +void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *iter, int64_t sector_num) { - assert(hbi->hb); - hbitmap_iter_init(hbi, hbi->hb, offset); + hbitmap_iter_init(&iter->hbi, iter->hbi.hb, sector_num); } int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) diff --git a/block/mirror.c b/block/mirror.c index 2c0edfa..5668b4e 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -53,7 +53,7 @@ typedef struct MirrorBlockJob { int64_t bdev_length; unsigned long *cow_bitmap; BdrvDirtyBitmap *dirty_bitmap; - HBitmapIter hbi; + BdrvDirtyBitmapIter *dbi; uint8_t *buf; QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; int buf_free_count; @@ -172,10 +172,11 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) max_iov = MIN(source->bl.max_iov, s->target->bl.max_iov); - s->sector_num = hbitmap_iter_next(&s->hbi); + s->sector_num = bdrv_dirty_iter_next(s->dbi); if (s->sector_num < 0) { - bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi); - s->sector_num = hbitmap_iter_next(&s->hbi); + bdrv_dirty_iter_free(s->dbi); + s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); + s->sector_num = bdrv_dirty_iter_next(s->dbi); trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); assert(s->sector_num >= 0); } @@ -293,7 +294,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) */ if (next_sector > hbitmap_next_sector && bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) { - hbitmap_next_sector = hbitmap_iter_next(&s->hbi); + hbitmap_next_sector = bdrv_dirty_iter_next(s->dbi); } next_sector += sectors_per_chunk; @@ -504,7 +505,7 @@ static void coroutine_fn mirror_run(void *opaque) } } - bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi); + s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); for (;;) { uint64_t delay_ns = 0; int64_t cnt; @@ -617,6 +618,7 @@ immediate_exit: qemu_vfree(s->buf); g_free(s->cow_bitmap); g_free(s->in_flight_bitmap); + bdrv_dirty_iter_free(s->dbi); bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); if (s->target->blk) { blk_iostatus_disable(s->target->blk); diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h index 45c6046..e1dbd8e 100644 --- a/include/block/dirty-bitmap.h +++ b/include/block/dirty-bitmap.h @@ -37,8 +37,11 @@ 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); -void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi); -void bdrv_set_dirty_iter(struct HBitmapIter *hbi, int64_t offset); +BdrvDirtyBitmapIter *bdrv_dirty_iter_new(BdrvDirtyBitmap *bitmap, + uint64_t first_sector); +void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter); +int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter); +void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t sector_num); int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap); void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h index 0a2206d..444666f 100644 --- a/include/qemu/typedefs.h +++ b/include/qemu/typedefs.h @@ -11,6 +11,7 @@ typedef struct AioContext AioContext; typedef struct AllwinnerAHCIState AllwinnerAHCIState; typedef struct AudioState AudioState; typedef struct BdrvDirtyBitmap BdrvDirtyBitmap; +typedef struct BdrvDirtyBitmapIter BdrvDirtyBitmapIter; typedef struct BlockBackend BlockBackend; typedef struct BlockBackendRootState BlockBackendRootState; typedef struct BlockDriverState BlockDriverState;