From patchwork Mon May 4 17:07:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 1282842 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-cifs-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=cJI1CoKc; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49G8SS11HXz9sSW for ; Tue, 5 May 2020 03:08:06 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729885AbgEDRIE (ORCPT ); Mon, 4 May 2020 13:08:04 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:46061 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729992AbgEDRIE (ORCPT ); Mon, 4 May 2020 13:08:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588612083; 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=g1czMXHet0svqVZIYYLyb3eRaMa9uG3FZ/GvDWtLRkw=; b=cJI1CoKc2TI8mYr0GwUhW7yAcIwvpWBRbiv2O3zQ/ec62mn1HVzA32Vz7ptJEpIZhdI2TP Ku9pa1nR3h8HSez8AOu/E+5Kza+Ebykis4hV1OTLw+vnu/SE7Kl8VO9MVivwwKCAyRvcC5 w8Fqtz6nT7uMyMm9jZaPgasszUVlijQ= 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-195-vBvn-v_3Od-m0gXjR-wPsg-1; Mon, 04 May 2020 13:07:58 -0400 X-MC-Unique: vBvn-v_3Od-m0gXjR-wPsg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C9BA3108BD1E; Mon, 4 May 2020 17:07:55 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-118-225.rdu2.redhat.com [10.10.118.225]) by smtp.corp.redhat.com (Postfix) with ESMTP id A02CE62496; Mon, 4 May 2020 17:07:47 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 03/61] vm: Add wait/unlock functions for PG_fscache From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Jeff Layton Cc: dhowells@redhat.com, Matthew Wilcox , Alexander Viro , 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, 04 May 2020 18:07:46 +0100 Message-ID: <158861206682.340223.14897883495650401085.stgit@warthog.procyon.org.uk> In-Reply-To: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> References: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Add functions to unlock and wait for unlock of PG_fscache analogously with those for PG_lock. Signed-off-by: David Howells --- include/linux/pagemap.h | 14 ++++++++++++++ mm/filemap.c | 18 ++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index a8f7bd8ea1c6..6b90226e6ef9 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -461,6 +461,7 @@ extern int __lock_page_killable(struct page *page); extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm, unsigned int flags); extern void unlock_page(struct page *page); +extern void unlock_page_fscache(struct page *page); /* * Return true if the page was successfully locked @@ -535,6 +536,19 @@ static inline int wait_on_page_locked_killable(struct page *page) return wait_on_page_bit_killable(compound_head(page), PG_locked); } +/** + * wait_on_page_fscache - Wait for PG_fscache to be cleared on a page + * @page: The page + * + * Wait for the fscache mark to be removed from a page, usually signifying the + * completion of a write from that page to the cache. + */ +static inline void wait_on_page_fscache(struct page *page) +{ + if (PagePrivate2(page)) + wait_on_page_bit(compound_head(page), PG_fscache); +} + extern void put_and_wait_on_page_locked(struct page *page); void wait_on_page_writeback(struct page *page); diff --git a/mm/filemap.c b/mm/filemap.c index 23a051a7ef0f..609db7977687 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1296,6 +1296,24 @@ void unlock_page(struct page *page) } EXPORT_SYMBOL(unlock_page); +/** + * unlock_page_fscache - Unlock a page pinned with PG_fscache + * @page: The page + * + * Unlocks the page and wakes up sleepers in wait_on_page_fscache(). Also + * wakes those waiting for the lock and writeback bits because the wakeup + * mechanism is shared. But that's OK - those sleepers will just go back to + * sleep. + */ +void unlock_page_fscache(struct page *page) +{ + page = compound_head(page); + VM_BUG_ON_PAGE(!PagePrivate2(page), page); + clear_bit_unlock(PG_fscache, &page->flags); + wake_up_page_bit(page, PG_fscache); +} +EXPORT_SYMBOL(unlock_page_fscache); + /** * end_page_writeback - end writeback against a page * @page: the page