From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932105Ab3L3NqJ (ORCPT ); Mon, 30 Dec 2013 08:46:09 -0500 Received: from m59-178.qiye.163.com ([123.58.178.59]:38336 "EHLO m59-178.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756091Ab3L3NqE (ORCPT ); Mon, 30 Dec 2013 08:46:04 -0500 From: Li Wang To: Alexander Viro Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Cong Wang , Zefan Li , Matthew Wilcox , Li Wang , Yunchuan Wen Subject: [PATCH 2/3] Add shrink_pagecache_parent Date: Mon, 30 Dec 2013 21:45:17 +0800 Message-Id: <249cbd3edaa84dd58a0626780fb546ddf7c1dc11.1388409687.git.liwang@ubuntukylin.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: X-HM-Spam-Status: e1koWUFPN1dZCBgUCR5ZQUpOVU5OS0tLS0pCS0xIT0NNSFdZCQ4XHghZQV koKz0kKDQ9Lz06MjckMjUkMz46Pz4pQUtVS0A2IyQiPigkMjUkMz46Pz4pQUtVS0ArLykkNTQkMj UkMz46Pz4pQUlVS0A4NC41LykiJDg1QUtVS0ApPjwyNDUkOigyOkFLVUtAKyk0LTI1OD4kMy41Oj VBS1VLQD8iNTo2MjgkMiskNTQkMjUkMz46Pz4pQUtVS0A2LjcvMiQpOCsvJD8yPT0#KT41LyQyNS QzPjo*PilBSVVLQDIrJC80PzoiJDg1LyRLJEpLS0FLVUtAMiskTiQ2MjUuLz4kODUvJEskSktBS1 VLQDIrJEokNjI1Li8#JDg1LyRLJEpLQUtVS0AyKyRKJDM0LikkODUvJEskSktLQUtVS0AyKyRISy Q2MjUuLz4kODUvJEskTktBS1VLQDU0LyQ9OjY0LigkPzQ2OjI1JCgrPSQ9OjI3QUpLVUtAKC45JD 5BSlVOTlkG X-HM-Sender-Digest: e1kSHx4VD1lBWUc6MQg6Cjo4LDo4EDorKjhIOj4qOkMwCjFVSlVKSEND T0pKSk5OQkxKVTMWGhIXVRcSDBoVHDsOGQ4VDw4QAhcSFVUYFBZFWVdZDB4ZWUEdGhcIHldZCAFZ QUhIS0g3V1kSC1lBWUpKQlVIQlVKSU9VSkxLWQY+ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Analogous to shrink_dcache_parent except that it collects inodes. It is not very appropriate to be put in dcache.c, but d_walk can only be invoked from here. Signed-off-by: Li Wang Signed-off-by: Yunchuan Wen --- fs/dcache.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index 6055d61..0fc0f80 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1318,6 +1318,42 @@ void shrink_dcache_parent(struct dentry *parent) } EXPORT_SYMBOL(shrink_dcache_parent); +static enum d_walk_ret gather_inode(void *data, struct dentry *dentry) +{ + struct list_head *list = data; + struct inode *inode = dentry->d_inode; + + if ((inode == NULL) || ((!inode_owner_or_capable(inode)) && + (!capable(CAP_SYS_ADMIN)))) + goto out; + spin_lock(&inode->i_lock); + if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || + (inode->i_mapping->nrpages == 0) || + (!list_empty(&inode->i_lru))) { + goto out_unlock; + } + __iget(inode); + list_add_tail(&inode->i_lru, list); +out_unlock: + spin_unlock(&inode->i_lock); +out: + return D_WALK_CONTINUE; +} + +void shrink_pagecache_parent(struct dentry *parent) +{ + LIST_HEAD(list); + struct inode *inode, *next; + + d_walk(parent, &list, gather_inode, NULL); + list_for_each_entry_safe(inode, next, &list, i_lru) { + list_del_init(&inode->i_lru); + invalidate_mapping_pages(inode->i_mapping, 0, -1); + iput(inode); + } +} +EXPORT_SYMBOL(shrink_pagecache_parent); + static enum d_walk_ret umount_collect(void *_data, struct dentry *dentry) { struct select_data *data = _data; -- 1.7.9.5