From nobody Sun Oct 5 21:14:38 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1542247733966237.26744968691776; Wed, 14 Nov 2018 18:08:53 -0800 (PST) Received: from localhost ([::1]:35627 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gN75Q-00067X-Q6 for importer@patchew.org; Wed, 14 Nov 2018 21:08:52 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53522) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gN70g-0002ED-6Y for qemu-devel@nongnu.org; Wed, 14 Nov 2018 21:03:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gN70e-0005dr-9h for qemu-devel@nongnu.org; Wed, 14 Nov 2018 21:03:58 -0500 Received: from mx1.redhat.com ([209.132.183.28]:41612) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gN70U-0005aH-S6; Wed, 14 Nov 2018 21:03:50 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A08CD31256C4; Thu, 15 Nov 2018 02:03:44 +0000 (UTC) Received: from red.redhat.com (ovpn-123-32.rdu2.redhat.com [10.10.123.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id D8DF860C45; Thu, 15 Nov 2018 02:03:43 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Wed, 14 Nov 2018 20:03:24 -0600 Message-Id: <20181115020334.1189829-4-eblake@redhat.com> In-Reply-To: <20181115020334.1189829-1-eblake@redhat.com> References: <20181115020334.1189829-1-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Thu, 15 Nov 2018 02:03:44 +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: [Qemu-devel] [PATCH v2 03/13] vvfat: Switch to byte-based calls X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We are gradually moving away from sector-based interfaces, towards byte-based. Make the change for the last few sector-based calls into the block layer from the vvfat driver. Ideally, the vvfat driver should switch to doing everything byte-based, but that's a more invasive change that requires a bit more auditing. Signed-off-by: Eric Blake Reviewed-by: Alberto Garcia --- block/vvfat.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/block/vvfat.c b/block/vvfat.c index b7b61ea8b78..915a05ae4f2 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -1494,8 +1494,8 @@ static int vvfat_read(BlockDriverState *bs, int64_t s= ector_num, DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64 " allocated\n", sector_num, n >> BDRV_SECTOR_BITS)); - if (bdrv_read(s->qcow, sector_num, buf + i * 0x200, - n >> BDRV_SECTOR_BITS)) { + if (bdrv_pread(s->qcow, sector_num * BDRV_SECTOR_BITS, + buf + i * 0x200, n) < 0) { return -1; } i +=3D (n >> BDRV_SECTOR_BITS) - 1; @@ -1983,7 +1983,8 @@ static uint32_t get_cluster_count_for_direntry(BDRVVV= FATState* s, if (res) { return -1; } - res =3D bdrv_write(s->qcow, offset, s->cluster_buf= fer, 1); + res =3D bdrv_pwrite(s->qcow, offset * BDRV_SECTOR_= SIZE, + s->cluster_buffer, BDRV_SECTOR_S= IZE); if (res) { return -2; } @@ -2146,7 +2147,7 @@ DLOG(checkpoint()); * - get modified FAT * - compare the two FATs (TODO) * - get buffer for marking used clusters - * - recurse direntries from root (using bs->bdrv_read to make + * - recurse direntries from root (using bs->bdrv_pread to make * sure to get the new data) * - check that the FAT agrees with the size * - count the number of clusters occupied by this directory and @@ -2911,9 +2912,9 @@ static int handle_deletes(BDRVVVFATState* s) /* * synchronize mapping with new state: * - * - copy FAT (with bdrv_read) + * - copy FAT (with bdrv_pread) * - mark all filenames corresponding to mappings as deleted - * - recurse direntries from root (using bs->bdrv_read) + * - recurse direntries from root (using bs->bdrv_pread) * - delete files corresponding to mappings marked as deleted */ static int do_commit(BDRVVVFATState* s) @@ -2933,10 +2934,10 @@ static int do_commit(BDRVVVFATState* s) return ret; } - /* copy FAT (with bdrv_read) */ + /* copy FAT (with bdrv_pread) */ memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat); - /* recurse direntries from root (using bs->bdrv_read) */ + /* recurse direntries from root (using bs->bdrv_pread) */ ret =3D commit_direntries(s, 0, -1); if (ret) { fprintf(stderr, "Fatal: error while committing (%d)\n", ret); @@ -3050,7 +3051,8 @@ DLOG(checkpoint()); * Use qcow backend. Commit later. */ DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, = nb_sectors)); - ret =3D bdrv_write(s->qcow, sector_num, buf, nb_sectors); + ret =3D bdrv_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE, buf, + nb_sectors * BDRV_SECTOR_SIZE); if (ret < 0) { fprintf(stderr, "Error writing to qcow backend\n"); return ret; --=20 2.17.2