From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752675AbaBYJfG (ORCPT ); Tue, 25 Feb 2014 04:35:06 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:46401 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750744AbaBYJfD (ORCPT ); Tue, 25 Feb 2014 04:35:03 -0500 From: ebiederm@xmission.com (Eric W. Biederman) To: Al Viro Cc: "Serge E. Hallyn" , Linux-Fsdevel , Kernel Mailing List , Andy Lutomirski , Rob Landley , Linus Torvalds , Miklos Szeredi , Christoph Hellwig , Karel Zak , "J. Bruce Fields" , Fengguang Wu References: <87a9kkax0j.fsf@xmission.com> <8761v7h2pt.fsf@tw-ebiederman.twitter.com> <87li281wx6.fsf_-_@xmission.com> <87ob28kqks.fsf_-_@xmission.com> <874n3n7czm.fsf_-_@xmission.com> Date: Tue, 25 Feb 2014 01:34:55 -0800 In-Reply-To: <874n3n7czm.fsf_-_@xmission.com> (Eric W. Biederman's message of "Tue, 25 Feb 2014 01:33:49 -0800") Message-ID: <87y50z5ydc.fsf_-_@xmission.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-AID: U2FsdGVkX1/PuIw7HnX3fHM45mXDfB8Z/C0XxJgCODU= X-SA-Exim-Connect-IP: 98.207.154.105 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 3.1 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list * 1.5 XMNoVowels Alpha-numberic number with no vowels * 0.7 XMSubLong Long Subject * -3.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa06 1397; Body=1 Fuz1=1 Fuz2=1] * 0.5 XM_Body_Dirty_Words Contains a dirty word * 0.0 T_TooManySym_01 4+ unique symbols in subject X-Spam-DCC: XMission; sa06 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: *;Al Viro X-Spam-Relay-Country: Subject: [PATCH 01/12] vfs: Document the effect of d_revalidate on d_find_alias X-Spam-Flag: No X-SA-Exim-Version: 4.2.1 (built Wed, 14 Nov 2012 14:26:46 -0700) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org d_drop or check_submounts_and_drop called from d_revalidate can result in renamed directories with child dentries being unhashed. These renamed and drop directory dentries can be rehashed after d_materialise_unique uses d_find_alias to find them. Reviewed-by: Miklos Szeredi Signed-off-by: "Eric W. Biederman" --- fs/dcache.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/dcache.c b/fs/dcache.c index 265e0ce9769c..c71c86f7780e 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -726,7 +726,8 @@ EXPORT_SYMBOL(dget_parent); * acquire the reference to alias and return it. Otherwise return NULL. * Notice that if inode is a directory there can be only one alias and * it can be unhashed only if it has no children, or if it is the root - * of a filesystem. + * of a filesystem, or if the directory was renamed and d_revalidate + * was the first vfs operation to notice. * * If the inode has an IS_ROOT, DCACHE_DISCONNECTED alias, then prefer * any other hashed alias over that one unless @want_discon is set, -- 1.7.5.4