From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752685AbbJTXxA (ORCPT ); Tue, 20 Oct 2015 19:53:00 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:46608 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751945AbbJTXw6 (ORCPT ); Tue, 20 Oct 2015 19:52:58 -0400 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Dave Hansen , Naoya Horiguchi , Hugh Dickins , Davidlohr Bueso , Andrew Morton , Mike Kravetz Subject: [PATCH v2 1/4] mm/hugetlb: Define hugetlb_falloc structure for hole punch race Date: Tue, 20 Oct 2015 16:52:19 -0700 Message-Id: <1445385142-29936-2-git-send-email-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1445385142-29936-1-git-send-email-mike.kravetz@oracle.com> References: <1445385142-29936-1-git-send-email-mike.kravetz@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A hugetlb_falloc structure is pointed to by i_private during fallocate hole punch operations. Page faults check this structure and if they are in the hole, wait for the operation to finish. Signed-off-by: Mike Kravetz --- include/linux/hugetlb.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 685c262..4be35b9 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -42,6 +42,16 @@ struct resv_map { extern struct resv_map *resv_map_alloc(void); void resv_map_release(struct kref *ref); +/* + * hugetlb_falloc is used to prevent page faults during falloc hole punch + * operations. During hole punch, inode->i_private points to this struct. + */ +struct hugetlb_falloc { + wait_queue_head_t *waitq; /* Page faults waiting on hole punch */ + pgoff_t start; /* Start of fallocate hole */ + pgoff_t end; /* End of fallocate hole */ +}; + extern spinlock_t hugetlb_lock; extern int hugetlb_max_hstate __read_mostly; #define for_each_hstate(h) \ -- 2.4.3