From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF4BC39B96F for ; Sat, 25 Apr 2026 12:55:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777121761; cv=none; b=PdrfWsJOEV9gz8EGp4Mwqe+fHjbZbiP35ZSvByQu8oTRLz7xRbfHvqu4zJJywjjKxzWK1BX/+BaND6YJOXB7oB9p+dcpyXo+NYJP298A6ipCLto7mHg4Hs+qvYlQMa39n32QUhZSf4mt+v/ZVt8nGyzvfpbhyqRmqxjZsXjYxFc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777121761; c=relaxed/simple; bh=yF/XUG1fEGGiljws/ocbnY4IAhkOM1E5pMkNLbFWRK8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=Uo0n1wERfY0NAzNpnBdTm2ilUVD7Dtw4drYv1TJjCJc0spzb2VR5kshwX57Iiss2VzX2gqU1izUpr8P/O4gBYXO7y2mG16xcSQ9p92o5pFwkVXSsPF2hYl2deoOf60JkFc2dm4TlQfnw/mjMj5N47r9lpOm9JpTtnyeEljS0P5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=U1whlyQj; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="U1whlyQj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1777121759; 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=g1vxGFe1KJh0FZqySywfbvIcxTlJD3j+jfO/PbnF32U=; b=U1whlyQj5AIrLUy581oTis0/Ie3zVKIDxDDJ9Z4SQ9RQUhOWSUo5CyM5LcDV3sWjVdiCi/ LIrf1pdWmCsTURxIRzQDdTfqKWPteWah8NwZ9hDKB2U4EYJLDTbhlESxDKjjBRRy1SEgJ+ KfgSw15skGvdJo57LZQm/PO+1NqQyII= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-137-Na8Yz6jpPquSI5nYWvFL3g-1; Sat, 25 Apr 2026 08:55:53 -0400 X-MC-Unique: Na8Yz6jpPquSI5nYWvFL3g-1 X-Mimecast-MFC-AGG-ID: Na8Yz6jpPquSI5nYWvFL3g_1777121751 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B19071800473; Sat, 25 Apr 2026 12:55:51 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.48.17]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B747C1944CED; Sat, 25 Apr 2026 12:55:48 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Paulo Alcantara , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Wilcox Subject: [PATCH v3 16/19] netfs: Fix netfs_read_folio() to wait on writeback Date: Sat, 25 Apr 2026 13:54:20 +0100 Message-ID: <20260425125426.3855807-17-dhowells@redhat.com> In-Reply-To: <20260425125426.3855807-1-dhowells@redhat.com> References: <20260425125426.3855807-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-MFC-PROC-ID: iOMMKki2EG_A8zsF-TqUfLj8mj54sRWQGOLxCX0918g_1777121751 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag). Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading") Closes: https://sashiko.dev/#/patchset/20260414082004.3756080-1-dhowells%40redhat.com Signed-off-by: David Howells cc: Paulo Alcantara cc: Matthew Wilcox cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/netfs/buffered_read.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index f1cbd6e10ad7..2de849bd780f 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -506,6 +506,8 @@ int netfs_read_folio(struct file *file, struct folio *folio) struct netfs_inode *ctx = netfs_inode(mapping->host); int ret; + folio_wait_writeback(folio); + if (folio_test_dirty(folio)) return netfs_read_gaps(file, folio);