From patchwork Thu Sep 21 07:54:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Denis V. Lunev\" via" X-Patchwork-Id: 13393738 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F277CE706E0 for ; Thu, 21 Sep 2023 07:59:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qjEXz-00089j-2L; Thu, 21 Sep 2023 03:56:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qjEXh-0007aU-AZ; Thu, 21 Sep 2023 03:56:15 -0400 Received: from relay.virtuozzo.com ([130.117.225.111]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qjEXe-0002De-T4; Thu, 21 Sep 2023 03:56:08 -0400 Received: from ch-vpn.virtuozzo.com ([130.117.225.6] helo=iris.sw.ru) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1qjEWV-00BsUn-0D; Thu, 21 Sep 2023 09:55:07 +0200 To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, "Denis V. Lunev" , Alexander Ivanov Subject: [PULL v2 19/22] parallels: naive implementation of parallels_co_pdiscard Date: Thu, 21 Sep 2023 09:54:57 +0200 Message-Id: <20230921075500.694585-20-den@openvz.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230921075500.694585-1-den@openvz.org> References: <20230921075500.694585-1-den@openvz.org> MIME-Version: 1.0 Received-SPF: pass client-ip=130.117.225.111; envelope-from=den@openvz.org; helo=relay.virtuozzo.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: "Denis V. Lunev" X-Patchwork-Original-From: "Denis V. Lunev" via From: "Denis V. Lunev\" via" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org * Discarding with backing stores is not supported by the format. * There is no buffering/queueing of the discard operation. * Only operations aligned to the cluster are supported. Signed-off-by: Denis V. Lunev Reviewed-by: Alexander Ivanov --- block/parallels.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/block/parallels.c b/block/parallels.c index a97fb8b506..1808029f14 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -537,6 +537,51 @@ parallels_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, return ret; } + +static int coroutine_fn GRAPH_RDLOCK +parallels_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) +{ + int ret = 0; + uint32_t cluster, count; + BDRVParallelsState *s = bs->opaque; + + /* + * The image does not support ZERO mark inside the BAT, which means that + * stale data could be exposed from the backing file. + */ + if (bs->backing) { + return -ENOTSUP; + } + + if (!QEMU_IS_ALIGNED(offset, s->cluster_size)) { + return -ENOTSUP; + } else if (!QEMU_IS_ALIGNED(bytes, s->cluster_size)) { + return -ENOTSUP; + } + + cluster = offset / s->cluster_size; + count = bytes / s->cluster_size; + + qemu_co_mutex_lock(&s->lock); + for (; count > 0; cluster++, count--) { + int64_t host_off = bat2sect(s, cluster) << BDRV_SECTOR_BITS; + if (host_off == 0) { + continue; + } + + ret = bdrv_co_pdiscard(bs->file, host_off, s->cluster_size); + if (ret < 0) { + goto done; + } + + parallels_set_bat_entry(s, cluster, 0); + bitmap_clear(s->used_bmap, host_cluster_index(s, host_off), 1); + } +done: + qemu_co_mutex_unlock(&s->lock); + return ret; +} + static void parallels_check_unclean(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) @@ -1417,6 +1462,7 @@ static BlockDriver bdrv_parallels = { .bdrv_co_create = parallels_co_create, .bdrv_co_create_opts = parallels_co_create_opts, .bdrv_co_check = parallels_co_check, + .bdrv_co_pdiscard = parallels_co_pdiscard, }; static void bdrv_parallels_init(void)