From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 7734FC55178 for ; Mon, 26 Oct 2020 15:19:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1F21422460 for ; Mon, 26 Oct 2020 15:19:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dKfgeZnL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1F21422460 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 92B366B008A; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7ED846B008C; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 68C186B0092; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0068.hostedemail.com [216.40.44.68]) by kanga.kvack.org (Postfix) with ESMTP id 3AE0A6B008C for ; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id A02DD3625 for ; Mon, 26 Oct 2020 15:19:05 +0000 (UTC) X-FDA: 77414434650.18.sink25_360ebff27274 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id E203B100ED0CD for ; Mon, 26 Oct 2020 15:19:04 +0000 (UTC) X-HE-Tag: sink25_360ebff27274 X-Filterd-Recvd-Size: 5422 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Mon, 26 Oct 2020 15:19:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=u2Fe6BQ/u/f2UXO9kqkzvT+VV4hRg/ENhBrvFiLbe5s=; b=dKfgeZnLltsNCRY492u0UBMfel qg1TKqVaKjRSiA5LR5yaiie/d407qBVpsV/DMwBnPi87sFCUef+TqazMuJleIECxD61YLex96ipOa QTTbRCQtS4NuyhobrZ/ObBrWRP1Nee5CdhDaxbBu+XRCKbRW8GSswQ98veAxERha0vYWm8hMYngp+ akFQvO9VITfMKwWo3f/rl5F85fMSViaSj7l47Of6t65SMs/DdZRvRIgTqtdi5mGKcLqWOmeltGajp HUTYVEVo1g6RPdHuJaF17nqGpIk7+aOrGmlac/6JoAGGwd7WddEbmymrBwXMoLm2dkwogJWehs28Y bs7IGdLg==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kX4Gp-0006Jw-DX; Mon, 26 Oct 2020 15:18:51 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org, Vishal Verma Subject: [PATCH v2 1/4] mm: Introduce and use mapping_empty Date: Mon, 26 Oct 2020 15:18:46 +0000 Message-Id: <20201026151849.24232-2-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201026151849.24232-1-willy@infradead.org> References: <20201026151849.24232-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Instead of checking the two counters (nrpages and nrexceptional), we can just check whether i_pages is empty. Signed-off-by: Matthew Wilcox (Oracle) Tested-by: Vishal Verma --- fs/block_dev.c | 2 +- fs/dax.c | 2 +- fs/gfs2/glock.c | 3 +-- include/linux/pagemap.h | 5 +++++ mm/truncate.c | 18 +++--------------- 5 files changed, 11 insertions(+), 19 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 9e84b1928b94..34105f66e12f 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -79,7 +79,7 @@ static void kill_bdev(struct block_device *bdev) { struct address_space *mapping =3D bdev->bd_inode->i_mapping; =20 - if (mapping->nrpages =3D=3D 0 && mapping->nrexceptional =3D=3D 0) + if (mapping_empty(mapping)) return; =20 invalidate_bh_lrus(); diff --git a/fs/dax.c b/fs/dax.c index 5b47834f2e1b..53ed0ab8c958 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -965,7 +965,7 @@ int dax_writeback_mapping_range(struct address_space = *mapping, if (WARN_ON_ONCE(inode->i_blkbits !=3D PAGE_SHIFT)) return -EIO; =20 - if (!mapping->nrexceptional || wbc->sync_mode !=3D WB_SYNC_ALL) + if (mapping_empty(mapping) || wbc->sync_mode !=3D WB_SYNC_ALL) return 0; =20 trace_dax_writeback_range(inode, xas.xa_index, end_index); diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 5441c17562c5..bfad01ce096d 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -273,8 +273,7 @@ static void __gfs2_glock_put(struct gfs2_glock *gl) if (mapping) { truncate_inode_pages_final(mapping); if (!gfs2_withdrawn(sdp)) - GLOCK_BUG_ON(gl, mapping->nrpages || - mapping->nrexceptional); + GLOCK_BUG_ON(gl, !mapping_empty(mapping)); } trace_gfs2_glock_put(gl); sdp->sd_lockstruct.ls_ops->lm_put_lock(gl); diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index dc3390e6ee3e..86143d36d028 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -18,6 +18,11 @@ =20 struct pagevec; =20 +static inline bool mapping_empty(struct address_space *mapping) +{ + return xa_empty(&mapping->i_pages); +} + /* * Bits in mapping->flags. */ diff --git a/mm/truncate.c b/mm/truncate.c index 11ef90d7e3af..58524aaf67e2 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -342,7 +342,7 @@ void truncate_inode_pages_range(struct address_space = *mapping, struct page * page; bool partial_end; =20 - if (mapping->nrpages =3D=3D 0 && mapping->nrexceptional =3D=3D 0) + if (mapping_empty(mapping)) goto out; =20 /* @@ -470,9 +470,6 @@ EXPORT_SYMBOL(truncate_inode_pages); */ void truncate_inode_pages_final(struct address_space *mapping) { - unsigned long nrexceptional; - unsigned long nrpages; - /* * Page reclaim can not participate in regular inode lifetime * management (can't call iput()) and thus can race with the @@ -482,16 +479,7 @@ void truncate_inode_pages_final(struct address_space= *mapping) */ mapping_set_exiting(mapping); =20 - /* - * When reclaim installs eviction entries, it increases - * nrexceptional first, then decreases nrpages. Make sure we see - * this in the right order or we might miss an entry. - */ - nrpages =3D mapping->nrpages; - smp_rmb(); - nrexceptional =3D mapping->nrexceptional; - - if (nrpages || nrexceptional) { + if (!mapping_empty(mapping)) { /* * As truncation uses a lockless tree lookup, cycle * the tree lock to make sure any ongoing tree @@ -657,7 +645,7 @@ int invalidate_inode_pages2_range(struct address_spac= e *mapping, int ret2 =3D 0; int did_range_unmap =3D 0; =20 - if (mapping->nrpages =3D=3D 0 && mapping->nrexceptional =3D=3D 0) + if (mapping_empty(mapping)) goto out; =20 pagevec_init(&pvec); --=20 2.28.0