From nobody Fri Nov 14 00:48:49 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1583480496; cv=none; d=zohomail.com; s=zohoarc; b=nrBL4GZ4tXWhfx5AGMFn6V9QnkKU4isE6zGt969t2OdnGDHOlrIbkJhcb73iw4l2/k42cuNwDHA9NwFrp/FBJCMqsOQRRcGmEWUB7wnT1/CSqY7t0SrGFOhedzGSU/HRwWouWHugMFdcPoT6uJF3c4onINHMym8XG3x91fCqvW4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1583480496; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=MsOIieEcIQJFVEtWXWohiTg1rlMx/s+0fOBOWPQilkA=; b=lB/752HxdzeqTAazL6aqFemav7JpJ3lbE9KUPZsWj/PzijqNmXR43Rz02XH459W/0iKakzWkU4M6BYmiufdWvO9VORxdtKfep3UYMYz3xRWhQySNQWKhz88fmd1f6BMRADjI4uAVhrBvFyZIqG/OyY+XGtm6RuTu33pZoqV21PI= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1583480496983969.080622670377; Thu, 5 Mar 2020 23:41:36 -0800 (PST) Received: from localhost ([::1]:60516 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jA7bz-0002RT-Uy for importer@patchew.org; Fri, 06 Mar 2020 02:41:35 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:46316) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jA7ZI-00055c-8J for qemu-devel@nongnu.org; Fri, 06 Mar 2020 02:38:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jA7ZG-0008LW-B3 for qemu-devel@nongnu.org; Fri, 06 Mar 2020 02:38:48 -0500 Received: from relay.sw.ru ([185.231.240.75]:37960) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jA7ZC-0007wi-HX; Fri, 06 Mar 2020 02:38:42 -0500 Received: from vovaso.qa.sw.ru ([10.94.3.0] helo=kvm.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1jA7Z8-0002Qu-Hp; Fri, 06 Mar 2020 10:38:38 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Subject: [PATCH v3 6/9] block/block-copy: refactor interfaces to use bytes instead of end Date: Fri, 6 Mar 2020 10:38:28 +0300 Message-Id: <20200306073831.7737-7-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200306073831.7737-1-vsementsov@virtuozzo.com> References: <20200306073831.7737-1-vsementsov@virtuozzo.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 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, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, andrey.shinkevich@virtuozzo.com, jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" We have a lot of "chunk_end - start" invocations, let's switch to bytes/cur_bytes scheme instead. While being here, improve check on block_copy_do_copy parameters to not overflow when calculating nbytes and use int64_t for bytes in block_copy for consistency. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Andrey Shinkevich Reviewed-by: Max Reitz --- include/block/block-copy.h | 6 +-- block/block-copy.c | 78 ++++++++++++++++++++------------------ 2 files changed, 44 insertions(+), 40 deletions(-) diff --git a/include/block/block-copy.h b/include/block/block-copy.h index dc68c8c54e..039cf7c908 100644 --- a/include/block/block-copy.h +++ b/include/block/block-copy.h @@ -19,8 +19,8 @@ #include "qemu/co-shared-resource.h" =20 typedef struct BlockCopyInFlightReq { - int64_t start_byte; - int64_t end_byte; + int64_t start; + int64_t bytes; QLIST_ENTRY(BlockCopyInFlightReq) list; CoQueue wait_queue; /* coroutines blocked on this request */ } BlockCopyInFlightReq; @@ -86,7 +86,7 @@ void block_copy_state_free(BlockCopyState *s); int64_t block_copy_reset_unallocated(BlockCopyState *s, int64_t offset, int64_t *count); =20 -int coroutine_fn block_copy(BlockCopyState *s, int64_t start, uint64_t byt= es, +int coroutine_fn block_copy(BlockCopyState *s, int64_t start, int64_t byte= s, bool *error_is_read); =20 #endif /* BLOCK_COPY_H */ diff --git a/block/block-copy.c b/block/block-copy.c index 251d415a2c..4c947e548b 100644 --- a/block/block-copy.c +++ b/block/block-copy.c @@ -26,12 +26,12 @@ =20 static BlockCopyInFlightReq *find_conflicting_inflight_req(BlockCopyState = *s, int64_t start, - int64_t end) + int64_t bytes) { BlockCopyInFlightReq *req; =20 QLIST_FOREACH(req, &s->inflight_reqs, list) { - if (end > req->start_byte && start < req->end_byte) { + if (start + bytes > req->start && start < req->start + req->bytes)= { return req; } } @@ -41,21 +41,21 @@ static BlockCopyInFlightReq *find_conflicting_inflight_= req(BlockCopyState *s, =20 static void coroutine_fn block_copy_wait_inflight_reqs(BlockCopyState *s, int64_t start, - int64_t end) + int64_t bytes) { BlockCopyInFlightReq *req; =20 - while ((req =3D find_conflicting_inflight_req(s, start, end))) { + while ((req =3D find_conflicting_inflight_req(s, start, bytes))) { qemu_co_queue_wait(&req->wait_queue, NULL); } } =20 static void block_copy_inflight_req_begin(BlockCopyState *s, BlockCopyInFlightReq *req, - int64_t start, int64_t end) + int64_t start, int64_t bytes) { - req->start_byte =3D start; - req->end_byte =3D end; + req->start =3D start; + req->bytes =3D bytes; qemu_co_queue_init(&req->wait_queue); QLIST_INSERT_HEAD(&s->inflight_reqs, req, list); } @@ -153,24 +153,28 @@ void block_copy_set_progress_meter(BlockCopyState *s,= ProgressMeter *pm) /* * block_copy_do_copy * - * Do copy of cluser-aligned chunk. @end is allowed to exceed s->len only = to - * cover last cluster when s->len is not aligned to clusters. + * Do copy of cluster-aligned chunk. Requested region is allowed to exceed + * s->len only to cover last cluster when s->len is not aligned to cluster= s. * * No sync here: nor bitmap neighter intersecting requests handling, only = copy. * * Returns 0 on success. */ static int coroutine_fn block_copy_do_copy(BlockCopyState *s, - int64_t start, int64_t end, + int64_t start, int64_t bytes, bool zeroes, bool *error_is_rea= d) { int ret; - int nbytes =3D MIN(end, s->len) - start; + int64_t nbytes =3D MIN(start + bytes, s->len) - start; void *bounce_buffer =3D NULL; =20 + assert(start >=3D 0 && bytes > 0 && INT64_MAX - start >=3D bytes); assert(QEMU_IS_ALIGNED(start, s->cluster_size)); - assert(QEMU_IS_ALIGNED(end, s->cluster_size)); - assert(end < s->len || end =3D=3D QEMU_ALIGN_UP(s->len, s->cluster_siz= e)); + assert(QEMU_IS_ALIGNED(bytes, s->cluster_size)); + assert(start < s->len); + assert(start + bytes <=3D s->len || + start + bytes =3D=3D QEMU_ALIGN_UP(s->len, s->cluster_size)); + assert(nbytes < INT_MAX); =20 if (zeroes) { ret =3D bdrv_co_pwrite_zeroes(s->target, start, nbytes, s->write_f= lags & @@ -354,11 +358,10 @@ int64_t block_copy_reset_unallocated(BlockCopyState *= s, } =20 int coroutine_fn block_copy(BlockCopyState *s, - int64_t start, uint64_t bytes, + int64_t start, int64_t bytes, bool *error_is_read) { int ret =3D 0; - int64_t end =3D bytes + start; /* bytes */ BlockCopyInFlightReq req; =20 /* @@ -369,32 +372,32 @@ int coroutine_fn block_copy(BlockCopyState *s, bdrv_get_aio_context(s->target->bs)); =20 assert(QEMU_IS_ALIGNED(start, s->cluster_size)); - assert(QEMU_IS_ALIGNED(end, s->cluster_size)); + assert(QEMU_IS_ALIGNED(bytes, s->cluster_size)); =20 block_copy_wait_inflight_reqs(s, start, bytes); - block_copy_inflight_req_begin(s, &req, start, end); + block_copy_inflight_req_begin(s, &req, start, bytes); =20 - while (start < end) { - int64_t next_zero, chunk_end, status_bytes; + while (bytes) { + int64_t next_zero, cur_bytes, status_bytes; =20 if (!bdrv_dirty_bitmap_get(s->copy_bitmap, start)) { trace_block_copy_skip(s, start); start +=3D s->cluster_size; + bytes -=3D s->cluster_size; continue; /* already copied */ } =20 - chunk_end =3D MIN(end, start + s->copy_size); + cur_bytes =3D MIN(bytes, s->copy_size); =20 next_zero =3D bdrv_dirty_bitmap_next_zero(s->copy_bitmap, start, - chunk_end - start); + cur_bytes); if (next_zero >=3D 0) { assert(next_zero > start); /* start is dirty */ - assert(next_zero < chunk_end); /* no need to do MIN() */ - chunk_end =3D next_zero; + assert(next_zero < start + cur_bytes); /* no need to do MIN() = */ + cur_bytes =3D next_zero - start; } =20 - ret =3D block_copy_block_status(s, start, chunk_end - start, - &status_bytes); + ret =3D block_copy_block_status(s, start, cur_bytes, &status_bytes= ); if (s->skip_unallocated && !(ret & BDRV_BLOCK_ALLOCATED)) { bdrv_reset_dirty_bitmap(s->copy_bitmap, start, status_bytes); progress_set_remaining(s->progress, @@ -402,30 +405,31 @@ int coroutine_fn block_copy(BlockCopyState *s, s->in_flight_bytes); trace_block_copy_skip_range(s, start, status_bytes); start +=3D status_bytes; + bytes -=3D status_bytes; continue; } =20 - chunk_end =3D MIN(chunk_end, start + status_bytes); + cur_bytes =3D MIN(cur_bytes, status_bytes); =20 trace_block_copy_process(s, start); =20 - bdrv_reset_dirty_bitmap(s->copy_bitmap, start, chunk_end - start); - s->in_flight_bytes +=3D chunk_end - start; + bdrv_reset_dirty_bitmap(s->copy_bitmap, start, cur_bytes); + s->in_flight_bytes +=3D cur_bytes; =20 - co_get_from_shres(s->mem, chunk_end - start); - ret =3D block_copy_do_copy(s, start, chunk_end, ret & BDRV_BLOCK_Z= ERO, + co_get_from_shres(s->mem, cur_bytes); + ret =3D block_copy_do_copy(s, start, cur_bytes, ret & BDRV_BLOCK_Z= ERO, error_is_read); - co_put_to_shres(s->mem, chunk_end - start); - s->in_flight_bytes -=3D chunk_end - start; + co_put_to_shres(s->mem, cur_bytes); + s->in_flight_bytes -=3D cur_bytes; if (ret < 0) { - bdrv_set_dirty_bitmap(s->copy_bitmap, start, chunk_end - start= ); + bdrv_set_dirty_bitmap(s->copy_bitmap, start, cur_bytes); break; } =20 - progress_work_done(s->progress, chunk_end - start); - s->progress_bytes_callback(chunk_end - start, s->progress_opaque); - start =3D chunk_end; - ret =3D 0; + progress_work_done(s->progress, cur_bytes); + s->progress_bytes_callback(cur_bytes, s->progress_opaque); + start +=3D cur_bytes; + bytes -=3D cur_bytes; } =20 block_copy_inflight_req_end(&req); --=20 2.21.0