linux-ext4 - Re: [PATCH v4 5/5] dax: move all DAX radix tree defs to fs/dax.c

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Message-ID: <20170724114859.GM652@quack2.suse.cz>
Date:   Mon, 24 Jul 2017 13:48:59 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Theodore Ts'o <tytso@....edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        Ingo Molnar <mingo@...hat.com>,
        Inki Dae <inki.dae@...sung.com>, Jan Kara <jack@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Rob Clark <robdclark@...il.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-nvdimm@...ts.01.org,
        linux-samsung-soc@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v4 5/5] dax: move all DAX radix tree defs to fs/dax.c

On Fri 21-07-17 16:39:55, Ross Zwisler wrote:
> Now that we no longer insert struct page pointers in DAX radix trees the
> page cache code no longer needs to know anything about DAX exceptional
> entries.  Move all the DAX exceptional entry definitions from dax.h to
> fs/dax.c.
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Suggested-by: Jan Kara <jack@...e.cz>

Looks good. You can add:

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

								Honza


> ---
>  fs/dax.c            | 34 ++++++++++++++++++++++++++++++++++
>  include/linux/dax.h | 41 -----------------------------------------
>  2 files changed, 34 insertions(+), 41 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 0e27d90..e7acc45 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -54,6 +54,40 @@ static int __init init_dax_wait_table(void)
>  }
>  fs_initcall(init_dax_wait_table);
>  
> +/*
> + * We use lowest available bit in exceptional entry for locking, one bit for
> + * the entry size (PMD) and two more to tell us if the entry is a zero page or
> + * an empty entry that is just used for locking.  In total four special bits.
> + *
> + * If the PMD bit isn't set the entry has size PAGE_SIZE, and if the ZERO_PAGE
> + * and EMPTY bits aren't set the entry is a normal DAX entry with a filesystem
> + * block allocation.
> + */
> +#define RADIX_DAX_SHIFT		(RADIX_TREE_EXCEPTIONAL_SHIFT + 4)
> +#define RADIX_DAX_ENTRY_LOCK	(1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
> +#define RADIX_DAX_PMD		(1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
> +#define RADIX_DAX_ZERO_PAGE	(1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
> +#define RADIX_DAX_EMPTY		(1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 3))
> +
> +static unsigned long dax_radix_sector(void *entry)
> +{
> +	return (unsigned long)entry >> RADIX_DAX_SHIFT;
> +}
> +
> +static void *dax_radix_locked_entry(sector_t sector, unsigned long flags)
> +{
> +	return (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY | flags |
> +			((unsigned long)sector << RADIX_DAX_SHIFT) |
> +			RADIX_DAX_ENTRY_LOCK);
> +}
> +
> +static unsigned int dax_radix_order(void *entry)
> +{
> +	if ((unsigned long)entry & RADIX_DAX_PMD)
> +		return PMD_SHIFT - PAGE_SHIFT;
> +	return 0;
> +}
> +
>  static int dax_is_pmd_entry(void *entry)
>  {
>  	return (unsigned long)entry & RADIX_DAX_PMD;
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index afa99bb..d0e3272 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -88,33 +88,6 @@ void dax_flush(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
>  		size_t size);
>  void dax_write_cache(struct dax_device *dax_dev, bool wc);
>  
> -/*
> - * We use lowest available bit in exceptional entry for locking, one bit for
> - * the entry size (PMD) and two more to tell us if the entry is a zero page or
> - * an empty entry that is just used for locking.  In total four special bits.
> - *
> - * If the PMD bit isn't set the entry has size PAGE_SIZE, and if the ZERO_PAGE
> - * and EMPTY bits aren't set the entry is a normal DAX entry with a filesystem
> - * block allocation.
> - */
> -#define RADIX_DAX_SHIFT	(RADIX_TREE_EXCEPTIONAL_SHIFT + 4)
> -#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
> -#define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
> -#define RADIX_DAX_ZERO_PAGE (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
> -#define RADIX_DAX_EMPTY (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 3))
> -
> -static inline unsigned long dax_radix_sector(void *entry)
> -{
> -	return (unsigned long)entry >> RADIX_DAX_SHIFT;
> -}
> -
> -static inline void *dax_radix_locked_entry(sector_t sector, unsigned long flags)
> -{
> -	return (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY | flags |
> -			((unsigned long)sector << RADIX_DAX_SHIFT) |
> -			RADIX_DAX_ENTRY_LOCK);
> -}
> -
>  ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
>  		const struct iomap_ops *ops);
>  int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
> @@ -136,20 +109,6 @@ static inline int __dax_zero_page_range(struct block_device *bdev,
>  }
>  #endif
>  
> -#ifdef CONFIG_FS_DAX_PMD
> -static inline unsigned int dax_radix_order(void *entry)
> -{
> -	if ((unsigned long)entry & RADIX_DAX_PMD)
> -		return PMD_SHIFT - PAGE_SHIFT;
> -	return 0;
> -}
> -#else
> -static inline unsigned int dax_radix_order(void *entry)
> -{
> -	return 0;
> -}
> -#endif
> -
>  static inline bool dax_mapping(struct address_space *mapping)
>  {
>  	return mapping->host && IS_DAX(mapping->host);
> -- 
> 2.9.4
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR