Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935230AbcCPWzj (ORCPT ); Wed, 16 Mar 2016 18:55:39 -0400 Received: from mail.sigma-star.at ([95.130.255.111]:45996 "EHLO mail.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932788AbcCPWzg (ORCPT ); Wed, 16 Mar 2016 18:55:36 -0400 From: Richard Weinberger To: linux-mtd@lists.infradead.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, boris.brezillon@free-electrons.com, maxime.ripard@free-electrons.com, david@sigma-star.at, david@fromorbit.com, dedekind1@gmail.com, alex@nextthing.co, akpm@linux-foundation.org, sasha.levin@oracle.com, iamjoonsoo.kim@lge.com, rvaswani@codeaurora.org, tony.luck@intel.com, shailendra.capricorn@gmail.com, "Kirill A. Shutemov" , Richard Weinberger Subject: [PATCH] UBIFS: Implement ->migratepage() Date: Wed, 16 Mar 2016 23:55:19 +0100 Message-Id: <1458168919-11597-1-git-send-email-richard@nod.at> X-Mailer: git-send-email 2.5.0 In-Reply-To: <56E9C658.1020903@nod.at> References: <56E9C658.1020903@nod.at> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1995 Lines: 66 From: "Kirill A. Shutemov" When using CMA during page migrations UBIFS might get confused and the following assert triggers: UBIFS assert failed in ubifs_set_page_dirty at 1451 (pid 436) UBIFS is using PagePrivate() which can have different meanings across filesystems. Therefore the generic page migration code cannot handle this case correctly. We have to implement our own migration function which basically does a plain copy but also duplicates the page private flag. Signed-off-by: Kirill A. Shutemov [rw: Massaged changelog] Signed-off-by: Richard Weinberger --- fs/ubifs/file.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index 0edc128..48b2944 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -52,6 +52,7 @@ #include "ubifs.h" #include #include +#include static int read_block(struct inode *inode, void *addr, unsigned int block, struct ubifs_data_node *dn) @@ -1452,6 +1453,24 @@ static int ubifs_set_page_dirty(struct page *page) return ret; } +static int ubifs_migrate_page(struct address_space *mapping, + struct page *newpage, struct page *page, enum migrate_mode mode) +{ + int rc; + + rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0); + if (rc != MIGRATEPAGE_SUCCESS) + return rc; + + if (PagePrivate(page)) { + ClearPagePrivate(page); + SetPagePrivate(newpage); + } + + migrate_page_copy(newpage, page); + return MIGRATEPAGE_SUCCESS; +} + static int ubifs_releasepage(struct page *page, gfp_t unused_gfp_flags) { /* @@ -1591,6 +1610,7 @@ const struct address_space_operations ubifs_file_address_operations = { .write_end = ubifs_write_end, .invalidatepage = ubifs_invalidatepage, .set_page_dirty = ubifs_set_page_dirty, + .migratepage = ubifs_migrate_page, .releasepage = ubifs_releasepage, }; -- 2.5.0