From patchwork Fri Nov 20 15:18:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 11921085 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B16DC63777 for ; Fri, 20 Nov 2020 15:18:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D26EE22240 for ; Fri, 20 Nov 2020 15:18:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AgNt/9yP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729610AbgKTPST (ORCPT ); Fri, 20 Nov 2020 10:18:19 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:60758 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729603AbgKTPSS (ORCPT ); Fri, 20 Nov 2020 10:18:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605885495; 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=TzJwuSYmIv08QOldJ+lmyqmRT+nFq4oVdVrl/IEJfb8=; b=AgNt/9yPtAC3OTUJTThv+KepUR0CHAvz2UIXVnhkLaFBzVLGVKMSvQCRZWtKeQu1nyVaaa 3FyT+cA7uEDWXlWtrR1F1Zu/Q+kpBdHsgtpujgvQr3m5/MXtLe3t72jlXYvqtIDcuHWvT5 8yTeck7Y932JPB606gZY2zfpluAiw10= 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-463-vKX0GsOUO6qp4oSQOsDwiw-1; Fri, 20 Nov 2020 10:18:11 -0500 X-MC-Unique: vKX0GsOUO6qp4oSQOsDwiw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 04364AFA98; Fri, 20 Nov 2020 15:18:08 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-112-246.rdu2.redhat.com [10.10.112.246]) by smtp.corp.redhat.com (Postfix) with ESMTP id BDC8519C71; Fri, 20 Nov 2020 15:18:00 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 71/76] afs: Copy local writes to the cache when writing to the server From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: dhowells@redhat.com, Jeff Layton , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, 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: Fri, 20 Nov 2020 15:18:00 +0000 Message-ID: <160588547998.3465195.14055966521328195914.stgit@warthog.procyon.org.uk> In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> References: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org When writing to the server from afs_writepage() or afs_writepages(), copy the data to the cache object too. To make this possible, the cookie must have its active users count incremented when the page is dirtied and kept incremented until we manage to clean up all the pages. This allows the writeback to take place after the last file struct is released. Signed-off-by: David Howells --- fs/afs/file.c | 6 ++++ fs/afs/inode.c | 11 ++++++-- fs/afs/internal.h | 1 + fs/afs/super.c | 1 + fs/afs/write.c | 74 +++++++++++++++++++++++++++++++++++++++++++++-------- 5 files changed, 79 insertions(+), 14 deletions(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index 21c0ea627bd4..bd070684de53 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -403,6 +403,12 @@ static void afs_readahead(struct readahead_control *ractl) netfs_readahead(ractl, &afs_req_ops, NULL); } +int afs_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + fscache_unpin_writeback(wbc, afs_vnode_cache(AFS_FS_I(inode))); + return 0; +} + /* * Adjust the dirty region of the page on truncation or full invalidation, * getting rid of the markers altogether if the region is entirely invalidated. diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 177baeea5a1e..51e55bfadb54 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -776,9 +776,7 @@ int afs_drop_inode(struct inode *inode) */ void afs_evict_inode(struct inode *inode) { - struct afs_vnode *vnode; - - vnode = AFS_FS_I(inode); + struct afs_vnode *vnode = AFS_FS_I(inode); _enter("{%llx:%llu.%d}", vnode->fid.vid, @@ -790,6 +788,13 @@ void afs_evict_inode(struct inode *inode) ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); truncate_inode_pages_final(&inode->i_data); + + if (inode->i_state & I_PINNING_FSCACHE_WB) { + struct afs_vnode_cache_aux aux; + loff_t i_size = i_size_read(&vnode->vfs_inode); + aux.data_version = vnode->status.data_version; + fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size); + } clear_inode(inode); while (!list_empty(&vnode->wb_keys)) { diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 7a76bedd19d9..bc76c08b9f38 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1045,6 +1045,7 @@ extern int afs_release(struct inode *, struct file *); extern int afs_fetch_data(struct afs_vnode *, struct afs_read *); extern struct afs_read *afs_alloc_read(gfp_t); extern void afs_put_read(struct afs_read *); +extern int afs_write_inode(struct inode *, struct writeback_control *); static inline struct afs_read *afs_get_read(struct afs_read *req) { diff --git a/fs/afs/super.c b/fs/afs/super.c index d745e228961a..c95523e90fe6 100644 --- a/fs/afs/super.c +++ b/fs/afs/super.c @@ -61,6 +61,7 @@ int afs_net_id; static const struct super_operations afs_super_ops = { .statfs = afs_statfs, .alloc_inode = afs_alloc_inode, + .write_inode = afs_write_inode, .drop_inode = afs_drop_inode, .destroy_inode = afs_destroy_inode, .free_inode = afs_free_inode, diff --git a/fs/afs/write.c b/fs/afs/write.c index b2e03de09c24..627b08d8de1f 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -15,13 +15,16 @@ #include #include "internal.h" +static void afs_write_to_cache(struct afs_vnode *vnode, loff_t start, size_t len, + loff_t i_size); + /* - * mark a page as having been made dirty and thus needing writeback + * Mark a page as having been made dirty and thus needing writeback. We also + * need to pin the cache object to write back to. */ int afs_set_page_dirty(struct page *page) { - _enter(""); - return __set_page_dirty_nobuffers(page); + return fscache_set_page_dirty(page, afs_vnode_cache(AFS_FS_I(page->mapping->host))); } /* @@ -113,7 +116,7 @@ int afs_write_end(struct file *file, struct address_space *mapping, unsigned long priv; unsigned int f, from = pos & (thp_size(page) - 1); unsigned int t, to = from + copied; - loff_t i_size, maybe_i_size; + loff_t i_size, write_end_pos; _enter("{%llx:%llu},{%lx}", vnode->fid.vid, vnode->fid.vnode, page->index); @@ -121,15 +124,16 @@ int afs_write_end(struct file *file, struct address_space *mapping, if (copied == 0) goto out; - maybe_i_size = pos + copied; + write_end_pos = pos + copied; i_size = i_size_read(&vnode->vfs_inode); - if (maybe_i_size > i_size) { + if (write_end_pos > i_size) { write_seqlock(&vnode->cb_lock); i_size = i_size_read(&vnode->vfs_inode); - if (maybe_i_size > i_size) - i_size_write(&vnode->vfs_inode, maybe_i_size); + if (write_end_pos > i_size) + i_size_write(&vnode->vfs_inode, write_end_pos); write_sequnlock(&vnode->cb_lock); + fscache_update_cookie(afs_vnode_cache(vnode), NULL, &write_end_pos); } ASSERT(PageUptodate(page)); @@ -468,7 +472,8 @@ static void afs_extend_writeback(struct address_space *mapping, if (!trylock_page(page)) break; - if (!PageDirty(page) || PageWriteback(page)) { + if (!PageDirty(page) || PageWriteback(page) || + PageFsCache(page)) { unlock_page(page); break; } @@ -514,6 +519,8 @@ static void afs_extend_writeback(struct address_space *mapping, BUG(); if (test_set_page_writeback(page)) BUG(); + if (TestSetPageFsCache(page)) + BUG(); *_count -= thp_nr_pages(page); unlock_page(page); @@ -548,6 +555,8 @@ static ssize_t afs_write_back_from_locked_page(struct address_space *mapping, if (test_set_page_writeback(page)) BUG(); + if (TestSetPageFsCache(page)) + BUG(); count -= thp_nr_pages(page); @@ -587,12 +596,18 @@ static ssize_t afs_write_back_from_locked_page(struct address_space *mapping, if (start < i_size) { _debug("write back %x @%llx [%llx]", len, start, i_size); + /* Speculatively write to the cache. We have to fix this up + * later if the store fails. + */ + afs_write_to_cache(vnode, start, len, i_size); + iov_iter_xarray(&iter, WRITE, &mapping->i_pages, start, len); ret = afs_store_data(vnode, &iter, start, false); } else { _debug("write discard %x @%llx [%llx]", len, start, i_size); /* The dirty region was entirely beyond the EOF. */ + fscache_clear_page_bits(mapping, start, len); afs_pages_written_back(vnode, start, len); ret = 0; } @@ -650,6 +665,10 @@ int afs_writepage(struct page *page, struct writeback_control *wbc) _enter("{%lx},", page->index); +#ifdef CONFIG_AFS_FSCACHE + wait_on_page_fscache(page); +#endif + start = page->index * PAGE_SIZE; ret = afs_write_back_from_locked_page(page->mapping, wbc, page, start, LLONG_MAX - start); @@ -712,10 +731,14 @@ static int afs_writepages_region(struct address_space *mapping, continue; } - if (PageWriteback(page)) { + if (PageWriteback(page) || PageFsCache(page)) { unlock_page(page); - if (wbc->sync_mode != WB_SYNC_NONE) + if (wbc->sync_mode != WB_SYNC_NONE) { wait_on_page_writeback(page); +#ifdef CONFIG_AFS_FSCACHE + wait_on_page_fscache(page); +#endif + } put_page(page); continue; } @@ -945,3 +968,32 @@ int afs_launder_page(struct page *page) wait_on_page_fscache(page); return ret; } + +/* + * Deal with the completion of writing the data to the cache. + */ +static void afs_write_to_cache_done(void *priv, ssize_t transferred_or_error) +{ + struct afs_vnode *vnode = priv; + + if (IS_ERR_VALUE(transferred_or_error) && + transferred_or_error != -ENOBUFS) { + struct afs_vnode_cache_aux aux = { + .data_version = vnode->status.data_version, + }; + + fscache_invalidate(afs_vnode_cache(vnode), &aux, + i_size_read(&vnode->vfs_inode), 0); + } +} + +/* + * Save the write to the cache also. + */ +static void afs_write_to_cache(struct afs_vnode *vnode, + loff_t start, size_t len, loff_t i_size) +{ + fscache_write_to_cache(afs_vnode_cache(vnode), + vnode->vfs_inode.i_mapping, start, len, i_size, + afs_write_to_cache_done, vnode); +}