From patchwork Mon Oct 18 15:05:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 12567219 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC6DEC433F5 for ; Mon, 18 Oct 2021 15:06:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A45D60E0C for ; Mon, 18 Oct 2021 15:06:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232094AbhJRPJH (ORCPT ); Mon, 18 Oct 2021 11:09:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:22462 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231775AbhJRPHo (ORCPT ); Mon, 18 Oct 2021 11:07:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634569532; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lCtXt/S98B8O04e5eLfCRcYEGlq2GeHKHWlj3+Qmlnw=; b=dSG9lLilqzKM9fuQ8O4Fw/z8dv7uwZNHWVctLdMobhbJapuyq3uYQmMdPdB8o6fCXn9UPR u3zzA9RmUdNC9Zh2sHS1TN+kX0A0o3XPErCq483N0A7LNWQOSzZIl7Drsz6IxzvQXcVGuX EHs1BqZjeQ64TJHnhic2YFiyL5KEDjw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-428-eqeM14vVO2quZOXq8ExUyA-1; Mon, 18 Oct 2021 11:05:29 -0400 X-MC-Unique: eqeM14vVO2quZOXq8ExUyA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7272910151E0; Mon, 18 Oct 2021 15:05:27 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id A12FE57CA4; Mon, 18 Oct 2021 15:05:12 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 55/67] afs: Skip truncation on the server of data we haven't written yet From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 18 Oct 2021 16:05:11 +0100 Message-ID: <163456951186.2614702.16840420880926305225.stgit@warthog.procyon.org.uk> In-Reply-To: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Don't send a truncation RPC to the server if we're only shortening data that's in the pagecache and is beyond the server's EOF. Also don't automatically force writeback on setattr, but do wait to store RPCs that are in the region to be removed on a shortening truncation. Signed-off-by: David Howells --- fs/afs/inode.c | 45 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 35 insertions(+), 10 deletions(-) diff --git a/fs/afs/inode.c b/fs/afs/inode.c index c4af4fda37dd..4c66a2b86add 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -848,42 +848,67 @@ static const struct afs_operation_ops afs_setattr_operation = { int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, struct iattr *attr) { + const unsigned int supported = + ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | + ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; struct afs_operation *op; struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); + struct inode *inode = &vnode->vfs_inode; + loff_t i_size; int ret; _enter("{%llx:%llu},{n=%pd},%x", vnode->fid.vid, vnode->fid.vnode, dentry, attr->ia_valid); - if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | - ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | - ATTR_TOUCH))) { + if (!(attr->ia_valid & supported)) { _leave(" = 0 [unsupported]"); return 0; } + i_size = i_size_read(inode); if (attr->ia_valid & ATTR_SIZE) { - if (!S_ISREG(vnode->vfs_inode.i_mode)) + if (!S_ISREG(inode->i_mode)) return -EISDIR; - ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); + ret = inode_newsize_ok(inode, attr->ia_size); if (ret) return ret; - if (attr->ia_size == i_size_read(&vnode->vfs_inode)) + if (attr->ia_size == i_size) attr->ia_valid &= ~ATTR_SIZE; } fscache_use_cookie(afs_vnode_cache(vnode), true); - /* flush any dirty data outstanding on a regular file */ - if (S_ISREG(vnode->vfs_inode.i_mode)) - filemap_write_and_wait(vnode->vfs_inode.i_mapping); - /* Prevent any new writebacks from starting whilst we do this. */ down_write(&vnode->validate_lock); + if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { + loff_t size = attr->ia_size; + + /* Wait for any outstanding writes to the server to complete */ + loff_t from = min(size, i_size); + loff_t to = max(size, i_size); + ret = filemap_fdatawait_range(inode->i_mapping, from, to); + if (ret < 0) + goto out_unlock; + + /* Don't talk to the server if we're just shortening in-memory + * writes that haven't gone to the server yet. + */ + if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && + attr->ia_size < i_size && + attr->ia_size > vnode->status.size) { + truncate_pagecache(inode, attr->ia_size); + fscache_resize_cookie(afs_vnode_cache(vnode), + attr->ia_size); + i_size_write(inode, attr->ia_size); + ret = 0; + goto out_unlock; + } + } + op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? afs_file_key(attr->ia_file) : NULL), vnode->volume);