linux-kernel - Re: [PATCH 2/2] UBIFS: Implement ->migratepage()

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Message-ID: <56FE4A1B.606@suse.cz>
Date:	Fri, 1 Apr 2016 12:14:51 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Richard Weinberger <richard@....at>, linux-fsdevel@...r.kernel.org
Cc:	linux-mtd@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, boris.brezillon@...e-electrons.com,
	maxime.ripard@...e-electrons.com, david@...ma-star.at,
	david@...morbit.com, dedekind1@...il.com, alex@...tthing.co,
	akpm@...ux-foundation.org, sasha.levin@...cle.com,
	iamjoonsoo.kim@....com, rvaswani@...eaurora.org,
	tony.luck@...el.com, shailendra.capricorn@...il.com,
	kirill.shutemov@...ux.intel.com, hch@...radead.org,
	hughd@...gle.com, mgorman@...hsingularity.net
Subject: Re: [PATCH 2/2] UBIFS: Implement ->migratepage()

On 03/31/2016 11:58 PM, Richard Weinberger wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>
> During page migrations UBIFS might get confused
> and the following assert triggers:
> UBIFS assert failed in ubifs_set_page_dirty at 1451 (pid 436)

It would be useful to have the full trace in changelog.

> 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.
> UBIFS is not a block device filesystem and cannot use buffer_migrate_page().
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> [rw: Massaged changelog]
> Signed-off-by: Richard Weinberger <richard@....at>

Stable?

> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>   fs/ubifs/file.c | 20 ++++++++++++++++++++
>   1 file changed, 20 insertions(+)
>
> diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
> index 065c88f..5eea5f5 100644
> --- a/fs/ubifs/file.c
> +++ b/fs/ubifs/file.c
> @@ -52,6 +52,7 @@
>   #include "ubifs.h"
>   #include <linux/mount.h>
>   #include <linux/slab.h>
> +#include <linux/migrate.h>
>
>   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,
>   };
>
>