[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20121101132846.GB23132@quack.suse.cz>
Date: Thu, 1 Nov 2012 14:28:46 +0100
From: Jan Kara <jack@...e.cz>
To: "Darrick J. Wong" <darrick.wong@...cle.com>
Cc: axboe@...nel.dk, lucho@...kov.net, tytso@....edu, sage@...tank.com,
ericvh@...il.com, mfasheh@...e.com, dedekind1@...il.com,
adrian.hunter@...el.com, dhowells@...hat.com, sfrench@...ba.org,
jlbec@...lplan.org, rminnich@...dia.gov,
linux-cifs@...r.kernel.org, jack@...e.cz,
martin.petersen@...cle.com, neilb@...e.de, david@...morbit.com,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-mtd@...ts.infradead.org, bharrosh@...asas.com,
linux-fsdevel@...r.kernel.org,
v9fs-developer@...ts.sourceforge.net, ceph-devel@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-afs@...ts.infradead.org,
ocfs2-devel@....oracle.com
Subject: Re: [PATCH 2/3] mm: Only enforce stable page writes if the backing
device requires it
On Thu 01-11-12 00:58:21, Darrick J. Wong wrote:
> Create a helper function to check if a backing device requires stable page
> writes and, if so, performs the necessary wait. Then, make it so that all
> points in the memory manager that handle making pages writable use the helper
> function. This should provide stable page write support to most filesystems,
> while eliminating unnecessary waiting for devices that don't require the
> feature.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
> fs/buffer.c | 2 +-
> fs/ext4/inode.c | 2 +-
> include/linux/pagemap.h | 1 +
> mm/filemap.c | 3 ++-
> mm/page-writeback.c | 11 +++++++++++
> 5 files changed, 16 insertions(+), 3 deletions(-)
>
..
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 830893b..916dae1 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2275,3 +2275,14 @@ int mapping_tagged(struct address_space *mapping, int tag)
> return radix_tree_tagged(&mapping->page_tree, tag);
> }
> EXPORT_SYMBOL(mapping_tagged);
> +
> +void wait_on_stable_page_write(struct page *page)
> +{
> + struct backing_dev_info *bdi = page->mapping->backing_dev_info;
> +
> + if (!bdi_cap_stable_pages_required(bdi))
> + return;
> +
> + wait_on_page_writeback(page);
> +}
> +EXPORT_SYMBOL_GPL(wait_on_stable_page_write);
Just one nit: Maybe "wait_if_stable_write()" would describe the function
better? Otherwise the patch looks OK.
Honza
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists