From patchwork Tue Aug 20 23:20:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 820649 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C2B8B1C8FB2 for ; Tue, 20 Aug 2024 23:21:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724196098; cv=none; b=N9cYuGVCLzpBXBf1jTJ7+o56o30/GXlm1g8cd86E2I3Y2YfWc+ENQdQNxHEt9ZIx7/gYv8+p5MVTiqRAoX/UCCAx5NwFGg4LfL9Ytqs6rKT9dElpuCsSQGCAn4g8+Tv4OOOoDpALZhvXXIdJLcnJe6PoQLXJtzrn8qNaPvG5q2k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724196098; c=relaxed/simple; bh=g8vGiYgfUHHfeHz8oFJMF7SqHkz4KAmGdS17s4e9lUI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CMvW1bi9xwi2OmqTdM/3DSF/xoNGJEXztEHQGxJJZeQ+Z/n4nxwFcb1/2WZ6Vb8NcgfxLP51AmlvozKfnqGUBtizjKqyZUr2riCNJJUQIxnatI/g+CFW7h/9yyqTVWLg8xSj58u9rrzQfdvNTHkLIuCWaTSx81d1N2ENlvyu36M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=aO2za/8c; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aO2za/8c" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724196094; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LLNXobqu9Lr51n4CzgcItZvbbRppxWdYVF89daxGYJk=; b=aO2za/8cvuqSE2mLiHck1Njwte3AfjONKe6DRKx2ep10rTjHjpDVGQjseHt+Fp/Gdgt20J 5oPnr7IVTHk7hB9quOyqg4tbnKLJq/TPwlGhiHoEU4oxXy01tNHwIZoECrwClKCAa65Gqy yLspn9EAQSPkUSeu/+BBM1Ati17WDp0= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-34-12CfHN9WNkObG7tnXd9WhA-1; Tue, 20 Aug 2024 19:21:29 -0400 X-MC-Unique: 12CfHN9WNkObG7tnXd9WhA-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3436B195608A; Tue, 20 Aug 2024 23:21:25 +0000 (UTC) Received: from warthog.procyon.org.uk.com (unknown [10.42.28.30]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 09A0F1955E8C; Tue, 20 Aug 2024 23:21:20 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Pankaj Raghav , Jeff Layton , Matthew Wilcox , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Marc Dionne Subject: [PATCH 2/4] afs: Fix post-setattr file edit to do truncation correctly Date: Wed, 21 Aug 2024 00:20:56 +0100 Message-ID: <20240820232105.3792638-3-dhowells@redhat.com> In-Reply-To: <20240820232105.3792638-1-dhowells@redhat.com> References: <20240820232105.3792638-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 At the end of an kAFS RPC operation, there is an "edit" phase (originally intended for post-directory modification ops to edit the local image) that the setattr VFS op uses to fix up the pagecache if the RPC that requested truncation of a file was successful. afs_setattr_edit_file() calls truncate_setsize() which sets i_size, expands the pagecache if needed and truncates the pagecache. The first two of those, however, are redundant as they've already been done by afs_setattr_success() under the io_lock and the first is also done under the callback lock (cb_lock). Fix afs_setattr_edit_file() to call truncate_pagecache() instead (which is called by truncate_setsize(), thereby skipping the redundant parts. Fixes: 100ccd18bb41 ("netfs: Optimise away reads above the point at which there can be no data") Signed-off-by: David Howells cc: Matthew Wilcox (Oracle) cc: Pankaj Raghav cc: Jeff Layton cc: Marc Dionne cc: linux-afs@lists.infradead.org cc: netfs@lists.linux.dev cc: linux-mm@kvack.org cc: linux-fsdevel@vger.kernel.org --- fs/afs/inode.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 3acf5e050072..a95e77670b49 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -695,13 +695,18 @@ static void afs_setattr_edit_file(struct afs_operation *op) { struct afs_vnode_param *vp = &op->file[0]; struct afs_vnode *vnode = vp->vnode; + struct inode *inode = &vnode->netfs.inode; if (op->setattr.attr->ia_valid & ATTR_SIZE) { loff_t size = op->setattr.attr->ia_size; - loff_t i_size = op->setattr.old_i_size; + loff_t old = op->setattr.old_i_size; + + /* Note: inode->i_size was updated by afs_apply_status() inside + * the I/O and callback locks. + */ - if (size != i_size) { - truncate_setsize(&vnode->netfs.inode, size); + if (size != old) { + truncate_pagecache(inode, size); netfs_resize_file(&vnode->netfs, size, true); fscache_resize_cookie(afs_vnode_cache(vnode), size); }