From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756799Ab0ITPph (ORCPT ); Mon, 20 Sep 2010 11:45:37 -0400 Received: from cantor.suse.de ([195.135.220.2]:48846 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752208Ab0ITPpf (ORCPT ); Mon, 20 Sep 2010 11:45:35 -0400 From: Jan Kara To: Jens Axboe Cc: Christoph Hellwig , LKML , linux-fsdevel@vger.kernel.org, Jan Kara Subject: [PATCH 2/3] char: Mark /dev/zero and /dev/kmem as not capable of writeback Date: Mon, 20 Sep 2010 17:44:30 +0200 Message-Id: <1284997471-9850-3-git-send-email-jack@suse.cz> X-Mailer: git-send-email 1.6.4.2 In-Reply-To: <1284997471-9850-1-git-send-email-jack@suse.cz> References: <1284997471-9850-1-git-send-email-jack@suse.cz> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These devices don't do any writeback but their device inodes still can get dirty so mark bdi appropriately so that bdi code does the right thing and files inodes to lists of bdi carrying the device inodes. Signed-off-by: Jan Kara --- drivers/char/mem.c | 3 ++- fs/char_dev.c | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c index a398ecd..1f528fa 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -788,10 +788,11 @@ static const struct file_operations zero_fops = { /* * capabilities for /dev/zero * - permits private mappings, "copies" are taken of the source of zeros + * - no writeback happens */ static struct backing_dev_info zero_bdi = { .name = "char/mem", - .capabilities = BDI_CAP_MAP_COPY, + .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static const struct file_operations full_fops = { diff --git a/fs/char_dev.c b/fs/char_dev.c index f80a4f2..143d393 100644 --- a/fs/char_dev.c +++ b/fs/char_dev.c @@ -40,7 +40,9 @@ struct backing_dev_info directly_mappable_cdev_bdi = { #endif /* permit direct mmap, for read, write or exec */ BDI_CAP_MAP_DIRECT | - BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP), + BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP | + /* no writeback happens */ + BDI_CAP_NO_ACCT_AND_WRITEBACK), }; static struct kobj_map *cdev_map; -- 1.6.4.2