From nobody Mon Feb 9 05:18:57 2026 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 (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1518528895755479.3255775263593; Tue, 13 Feb 2018 05:34:55 -0800 (PST) Received: from localhost ([::1]:60429 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1elajR-0001eu-Tx for importer@patchew.org; Tue, 13 Feb 2018 08:34:49 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33102) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1elaFz-0007iT-1V for qemu-devel@nongnu.org; Tue, 13 Feb 2018 08:04:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1elaFw-0006cK-IN for qemu-devel@nongnu.org; Tue, 13 Feb 2018 08:04:23 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:60212 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1elaFk-0006OB-8t; Tue, 13 Feb 2018 08:04:08 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D497E4040852; Tue, 13 Feb 2018 13:04:07 +0000 (UTC) Received: from localhost (ovpn-117-34.ams2.redhat.com [10.36.117.34]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8761EB0789; Tue, 13 Feb 2018 13:04:07 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Tue, 13 Feb 2018 14:03:52 +0100 Message-Id: <20180213130356.8885-4-mreitz@redhat.com> In-Reply-To: <20180213130356.8885-1-mreitz@redhat.com> References: <20180213130356.8885-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Tue, 13 Feb 2018 13:04:07 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Tue, 13 Feb 2018 13:04:07 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mreitz@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH 3/7] gluster: Query current size in do_truncate() 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: Kevin Wolf , sheepdog@lists.wpkg.org, Hitoshi Mitake , Jeff Cody , qemu-devel@nongnu.org, Max Reitz , Liu Yuan Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Instead of expecting the current size to be 0, query it and allocate only the area [current_size, offset) if preallocation is requested. Signed-off-by: Max Reitz Reviewed-by: Eric Blake --- block/gluster.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/block/gluster.c b/block/gluster.c index 8178541416..806b894bc8 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -968,10 +968,27 @@ static coroutine_fn int qemu_gluster_co_pwrite_zeroes= (BlockDriverState *bs, static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset, PreallocMode prealloc, Error **errp) { + int64_t current_length; + + current_length =3D glfs_lseek(fd, 0, SEEK_END); + if (current_length < 0) { + error_setg_errno(errp, errno, "Failed to determine current size"); + return -errno; + } + + if (current_length > offset && prealloc !=3D PREALLOC_MODE_OFF) { + error_setg(errp, "Cannot use preallocation for shrinking files"); + return -ENOTSUP; + } + + if (current_length =3D=3D offset) { + return 0; + } + switch (prealloc) { #ifdef CONFIG_GLUSTERFS_FALLOCATE case PREALLOC_MODE_FALLOC: - if (glfs_fallocate(fd, 0, 0, offset)) { + if (glfs_fallocate(fd, 0, current_length, offset - current_length)= ) { error_setg_errno(errp, errno, "Could not preallocate data"); return -errno; } @@ -983,7 +1000,7 @@ static int qemu_gluster_do_truncate(struct glfs_fd *fd= , int64_t offset, error_setg_errno(errp, errno, "Could not resize file"); return -errno; } - if (glfs_zerofill(fd, 0, offset)) { + if (glfs_zerofill(fd, current_length, offset - current_length)) { error_setg_errno(errp, errno, "Could not zerofill the new area= "); return -errno; } --=20 2.14.3