From patchwork Thu Dec 9 17:10:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 522795 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71643C433FE for ; Thu, 9 Dec 2021 17:12:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242644AbhLIRPr (ORCPT ); Thu, 9 Dec 2021 12:15:47 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38141 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242153AbhLIRPr (ORCPT ); Thu, 9 Dec 2021 12:15:47 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1639069933; 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=Smq2iHbETeDCSV5UDmUclIIN3eV1C3P1o2VbgxUA3zE=; b=DRxjCDXe86Tyo/QAEpXk8mdG6wYQcwCXaCaqNAXO7rUyDfQJmBrjkWKxCKqvEnSoVEr+3u nONsaosNQiIAWMO/bWuhQgjpK7igjNwModmJCu7NfKs42ON2Lyp625xQFiXelHn/JAarpp NRUhMw77tpchehbwTdCN5Fo4CYLzSEo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-4-qsIiEhmuNBK-OBxqkQMfrA-1; Thu, 09 Dec 2021 12:11:04 -0500 X-MC-Unique: qsIiEhmuNBK-OBxqkQMfrA-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 4E5B810168C3; Thu, 9 Dec 2021 17:11:02 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.122]) by smtp.corp.redhat.com (Postfix) with ESMTP id E4B0119C59; Thu, 9 Dec 2021 17:10:58 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v2 66/67] ceph: add fscache writeback support From: David Howells To: linux-cachefs@redhat.com Cc: Jeff Layton , dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , JeffleXu , 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: Thu, 09 Dec 2021 17:10:58 +0000 Message-ID: <163906985808.143852.1383891557313186623.stgit@warthog.procyon.org.uk> In-Reply-To: <163906878733.143852.5604115678965006622.stgit@warthog.procyon.org.uk> References: <163906878733.143852.5604115678965006622.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: ceph-devel@vger.kernel.org From: Jeff Layton When updating the backing store from the pagecache (a'la writepage or writepages), write to the cache first. This allows us to keep caching files even when they are being written, as long as we have appropriate caps. Signed-off-by: Jeff Layton Signed-off-by: David Howells --- fs/ceph/addr.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 59 insertions(+), 8 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 0ffc4c8d7c10..e836f8f1d4f8 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -5,7 +5,6 @@ #include #include #include -#include /* generic_writepages */ #include #include #include @@ -384,6 +383,38 @@ static void ceph_readahead(struct readahead_control *ractl) netfs_readahead(ractl, &ceph_netfs_read_ops, (void *)(uintptr_t)got); } +#ifdef CONFIG_CEPH_FSCACHE +static void ceph_set_page_fscache(struct page *page) +{ + set_page_fscache(page); +} + +static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async) +{ + struct inode *inode = priv; + + if (IS_ERR_VALUE(error) && error != -ENOBUFS) + ceph_fscache_invalidate(inode, false); +} + +static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct fscache_cookie *cookie = ceph_fscache_cookie(ci); + + fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode), + ceph_fscache_write_terminated, inode, caching); +} +#else +static inline void ceph_set_page_fscache(struct page *page) +{ +} + +static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching) +{ +} +#endif /* CONFIG_CEPH_FSCACHE */ + struct ceph_writeback_ctl { loff_t i_size; @@ -499,6 +530,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) struct ceph_writeback_ctl ceph_wbc; struct ceph_osd_client *osdc = &fsc->client->osdc; struct ceph_osd_request *req; + bool caching = ceph_is_cache_enabled(inode); dout("writepage %p idx %lu\n", page, page->index); @@ -537,16 +569,17 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); - set_page_writeback(page); req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1, CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc, ceph_wbc.truncate_seq, ceph_wbc.truncate_size, true); - if (IS_ERR(req)) { - redirty_page_for_writepage(wbc, page); - end_page_writeback(page); + if (IS_ERR(req)) return PTR_ERR(req); - } + + set_page_writeback(page); + if (caching) + ceph_set_page_fscache(page); + ceph_fscache_write_to_cache(inode, page_off, len, caching); /* it may be a short write due to an object boundary */ WARN_ON_ONCE(len > thp_size(page)); @@ -605,6 +638,9 @@ static int ceph_writepage(struct page *page, struct writeback_control *wbc) struct inode *inode = page->mapping->host; BUG_ON(!inode); ihold(inode); + + wait_on_page_fscache(page); + err = writepage_nounlock(page, wbc); if (err == -ERESTARTSYS) { /* direct memory reclaimer was killed by SIGKILL. return 0 @@ -726,6 +762,7 @@ static int ceph_writepages_start(struct address_space *mapping, struct ceph_writeback_ctl ceph_wbc; bool should_loop, range_whole = false; bool done = false; + bool caching = ceph_is_cache_enabled(inode); dout("writepages_start %p (mode=%s)\n", inode, wbc->sync_mode == WB_SYNC_NONE ? "NONE" : @@ -849,7 +886,7 @@ static int ceph_writepages_start(struct address_space *mapping, unlock_page(page); break; } - if (PageWriteback(page)) { + if (PageWriteback(page) || PageFsCache(page)) { if (wbc->sync_mode == WB_SYNC_NONE) { dout("%p under writeback\n", page); unlock_page(page); @@ -857,6 +894,7 @@ static int ceph_writepages_start(struct address_space *mapping, } dout("waiting on writeback %p\n", page); wait_on_page_writeback(page); + wait_on_page_fscache(page); } if (!clear_page_dirty_for_io(page)) { @@ -989,9 +1027,19 @@ static int ceph_writepages_start(struct address_space *mapping, op_idx = 0; for (i = 0; i < locked_pages; i++) { u64 cur_offset = page_offset(pages[i]); + /* + * Discontinuity in page range? Ceph can handle that by just passing + * multiple extents in the write op. + */ if (offset + len != cur_offset) { + /* If it's full, stop here */ if (op_idx + 1 == req->r_num_ops) break; + + /* Kick off an fscache write with what we have so far. */ + ceph_fscache_write_to_cache(inode, offset, len, caching); + + /* Start a new extent */ osd_req_op_extent_dup_last(req, op_idx, cur_offset - offset); dout("writepages got pages at %llu~%llu\n", @@ -1002,14 +1050,17 @@ static int ceph_writepages_start(struct address_space *mapping, osd_req_op_extent_update(req, op_idx, len); len = 0; - offset = cur_offset; + offset = cur_offset; data_pages = pages + i; op_idx++; } set_page_writeback(pages[i]); + if (caching) + ceph_set_page_fscache(pages[i]); len += thp_size(page); } + ceph_fscache_write_to_cache(inode, offset, len, caching); if (ceph_wbc.size_stable) { len = min(len, ceph_wbc.i_size - offset);