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From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Jan Kara <jack@suse.cz>,
	snitzer@redhat.com, linux-nvdimm@lists.01.org,
	david@fromorbit.com, linux-kernel@vger.kernel.org,
	linux-xfs@vger.kernel.org,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	linux-fsdevel@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>,
	linux-ext4@vger.kernel.org, hch@lst.de
Subject: Re: [PATCH v8 05/18] ext4, dax: introduce ext4_dax_aops
Date: Tue, 3 Apr 2018 13:50:03 +0200	[thread overview]
Message-ID: <20180403115003.qfbedsjtxwirqkh6@quack2.suse.cz> (raw)
In-Reply-To: <152246895649.36038.5391043415273091960.stgit@dwillia2-desk3.amr.corp.intel.com>

On Fri 30-03-18 21:02:36, Dan Williams wrote:
> In preparation for the dax implementation to start associating dax pages
> to inodes via page->mapping, we need to provide a 'struct
> address_space_operations' instance for dax. Otherwise, direct-I/O
> triggers incorrect page cache assumptions and warnings.
> 
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> Cc: linux-ext4@vger.kernel.org
> Cc: Jan Kara <jack@suse.cz>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/ext4/inode.c |   42 +++++++++++++++++++++++++++++++-----------
>  1 file changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index c94780075b04..249a97b19181 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2725,12 +2725,6 @@ static int ext4_writepages(struct address_space *mapping,
>  	percpu_down_read(&sbi->s_journal_flag_rwsem);
>  	trace_ext4_writepages(inode, wbc);
>  
> -	if (dax_mapping(mapping)) {
> -		ret = dax_writeback_mapping_range(mapping, inode->i_sb->s_bdev,
> -						  wbc);
> -		goto out_writepages;
> -	}
> -
>  	/*
>  	 * No pages to write? This is mainly a kludge to avoid starting
>  	 * a transaction for special inodes like journal inode on last iput()
> @@ -2955,6 +2949,27 @@ static int ext4_writepages(struct address_space *mapping,
>  	return ret;
>  }
>  
> +static int ext4_dax_writepages(struct address_space *mapping,
> +			       struct writeback_control *wbc)
> +{
> +	int ret;
> +	long nr_to_write = wbc->nr_to_write;
> +	struct inode *inode = mapping->host;
> +	struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);
> +
> +	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
> +		return -EIO;
> +
> +	percpu_down_read(&sbi->s_journal_flag_rwsem);
> +	trace_ext4_writepages(inode, wbc);
> +
> +	ret = dax_writeback_mapping_range(mapping, inode->i_sb->s_bdev, wbc);
> +	trace_ext4_writepages_result(inode, wbc, ret,
> +				     nr_to_write - wbc->nr_to_write);
> +	percpu_up_read(&sbi->s_journal_flag_rwsem);
> +	return ret;
> +}
> +
>  static int ext4_nonda_switch(struct super_block *sb)
>  {
>  	s64 free_clusters, dirty_clusters;
> @@ -3857,10 +3872,6 @@ static ssize_t ext4_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
>  	if (ext4_has_inline_data(inode))
>  		return 0;
>  
> -	/* DAX uses iomap path now */
> -	if (WARN_ON_ONCE(IS_DAX(inode)))
> -		return 0;
> -
>  	trace_ext4_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));
>  	if (iov_iter_rw(iter) == READ)
>  		ret = ext4_direct_IO_read(iocb, iter);
> @@ -3946,6 +3957,13 @@ static const struct address_space_operations ext4_da_aops = {
>  	.error_remove_page	= generic_error_remove_page,
>  };
>  
> +static const struct address_space_operations ext4_dax_aops = {
> +	.writepages		= ext4_dax_writepages,
> +	.direct_IO		= noop_direct_IO,
> +	.set_page_dirty		= noop_set_page_dirty,
> +	.invalidatepage		= noop_invalidatepage,
> +};
> +
>  void ext4_set_aops(struct inode *inode)
>  {
>  	switch (ext4_inode_journal_mode(inode)) {
> @@ -3958,7 +3976,9 @@ void ext4_set_aops(struct inode *inode)
>  	default:
>  		BUG();
>  	}
> -	if (test_opt(inode->i_sb, DELALLOC))
> +	if (IS_DAX(inode))
> +		inode->i_mapping->a_ops = &ext4_dax_aops;
> +	else if (test_opt(inode->i_sb, DELALLOC))
>  		inode->i_mapping->a_ops = &ext4_da_aops;
>  	else
>  		inode->i_mapping->a_ops = &ext4_aops;
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR
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  reply	other threads:[~2018-04-03 11:50 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-31  4:02 [PATCH v8 00/18] dax: fix dma vs truncate/hole-punch Dan Williams
2018-03-31  4:02 ` [PATCH v8 01/18] dax: store pfns in the radix Dan Williams
2018-03-31  4:02 ` [PATCH v8 02/18] fs, dax: prepare for dax-specific address_space_operations Dan Williams
2018-03-31  4:02 ` [PATCH v8 03/18] block, dax: remove dead code in blkdev_writepages() Dan Williams
2018-03-31  4:02 ` [PATCH v8 04/18] xfs, dax: introduce xfs_dax_aops Dan Williams
2018-03-31  4:02 ` [PATCH v8 05/18] ext4, dax: introduce ext4_dax_aops Dan Williams
2018-04-03 11:50   ` Jan Kara [this message]
2018-03-31  4:02 ` [PATCH v8 06/18] ext2, dax: introduce ext2_dax_aops Dan Williams
2018-04-03 11:51   ` Jan Kara
2018-03-31  4:02 ` [PATCH v8 07/18] fs, dax: use page->mapping to warn if truncate collides with a busy page Dan Williams
2018-03-31  4:02 ` [PATCH v8 08/18] dax: introduce CONFIG_DAX_DRIVER Dan Williams
2018-03-31  4:02 ` [PATCH v8 09/18] dax, dm: allow device-mapper to operate without dax support Dan Williams
2018-03-31  4:03 ` [PATCH v8 10/18] dax, dm: introduce ->fs_{claim, release}() dax_device infrastructure Dan Williams
2018-04-03 18:24   ` Dan Williams
2018-04-03 19:39     ` Mike Snitzer
2018-04-03 19:47       ` Dan Williams
2018-04-03 20:36         ` [PATCH v9] " Dan Williams
2018-04-03 21:13           ` Mike Snitzer
2018-03-31  4:03 ` [PATCH v8 11/18] mm, dax: enable filesystems to trigger dev_pagemap ->page_free callbacks Dan Williams
2018-04-04 21:23   ` [v8, " Andrei Vagin
2018-04-04 21:27     ` Dan Williams
2018-04-04 21:35       ` Dan Williams
2018-04-04 23:19         ` Stephen Rothwell
2018-04-04 21:40     ` Andrei Vagin
2018-03-31  4:03 ` [PATCH v8 12/18] memremap: split devm_memremap_pages() and memremap() infrastructure Dan Williams
2018-03-31  4:03 ` [PATCH v8 13/18] mm, dev_pagemap: introduce CONFIG_DEV_PAGEMAP_OPS Dan Williams
2018-03-31  4:03 ` [PATCH v8 14/18] memremap: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Dan Williams
2018-03-31  4:03 ` [PATCH v8 15/18] mm, fs, dax: handle layout changes to pinned dax mappings Dan Williams
2018-04-04  9:46   ` Jan Kara
2018-04-04 10:06     ` Jan Kara
2018-04-04 14:12     ` Dan Williams
2018-04-07 19:38     ` Dan Williams
2018-04-08  3:11       ` Paul E. McKenney
2018-04-09 16:39         ` Jan Kara
2018-04-09 18:14           ` Paul E. McKenney
2018-04-09 16:49       ` Jan Kara
2018-04-09 16:51         ` Dan Williams
2018-04-13 22:03           ` Dan Williams
2018-04-13 22:48             ` Paul E. McKenney
2018-04-19 10:44             ` Jan Kara
2018-04-20  3:00               ` Dan Williams
2018-03-31  4:03 ` [PATCH v8 16/18] xfs: prepare xfs_break_layouts() to be called with XFS_MMAPLOCK_EXCL Dan Williams
2018-03-31  4:03 ` [PATCH v8 17/18] xfs: prepare xfs_break_layouts() for another layout type Dan Williams
2018-03-31  4:03 ` [PATCH v8 18/18] xfs, dax: introduce xfs_break_dax_layouts() Dan Williams
2018-04-04  9:55   ` Jan Kara

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