[v5,14/17] dax: move RADIX_DAX_* defines to dax.h

The RADIX_DAX_* defines currently mostly live in fs/dax.c, with just
RADIX_DAX_ENTRY_LOCK being in include/linux/dax.h so it can be used in
mm/filemap.c.  When we add PMD support, though, mm/filemap.c will also need
access to the RADIX_DAX_PTE type so it can properly construct a 4k sized
empty entry.

Instead of shifting the defines between dax.c and dax.h as they are
individually used in other code, just move them wholesale to dax.h so
they'll be available when we need them.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---
 fs/dax.c            | 14 --------------
 include/linux/dax.h | 15 ++++++++++++++-
 2 files changed, 14 insertions(+), 15 deletions(-)

On Fri, Oct 07, 2016 at 03:09:01PM -0600, Ross Zwisler wrote:
> The RADIX_DAX_* defines currently mostly live in fs/dax.c, with just
> RADIX_DAX_ENTRY_LOCK being in include/linux/dax.h so it can be used in
> mm/filemap.c.  When we add PMD support, though, mm/filemap.c will also need
> access to the RADIX_DAX_PTE type so it can properly construct a 4k sized
> empty entry.
> 
> Instead of shifting the defines between dax.c and dax.h as they are
> individually used in other code, just move them wholesale to dax.h so
> they'll be available when we need them.

Looks fine, assuming that the macros get cleaned up in the next patches..

Reviewed-by: Christoph Hellwig <hch@lst.de>
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

On Fri 07-10-16 15:09:01, Ross Zwisler wrote:
> The RADIX_DAX_* defines currently mostly live in fs/dax.c, with just
> RADIX_DAX_ENTRY_LOCK being in include/linux/dax.h so it can be used in
> mm/filemap.c.  When we add PMD support, though, mm/filemap.c will also need
> access to the RADIX_DAX_PTE type so it can properly construct a 4k sized
> empty entry.
> 
> Instead of shifting the defines between dax.c and dax.h as they are
> individually used in other code, just move them wholesale to dax.h so
> they'll be available when we need them.
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>

Looks good to me. You can add:

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

								Honza

> ---
>  fs/dax.c            | 14 --------------
>  include/linux/dax.h | 15 ++++++++++++++-
>  2 files changed, 14 insertions(+), 15 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 5e8febe..ac3cd05 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -34,20 +34,6 @@
>  #include <linux/iomap.h>
>  #include "internal.h"
>  
> -/*
> - * We use lowest available bit in exceptional entry for locking, other two
> - * bits to determine entry type. In total 3 special bits.
> - */
> -#define RADIX_DAX_SHIFT	(RADIX_TREE_EXCEPTIONAL_SHIFT + 3)
> -#define RADIX_DAX_PTE (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
> -#define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
> -#define RADIX_DAX_TYPE_MASK (RADIX_DAX_PTE | RADIX_DAX_PMD)
> -#define RADIX_DAX_TYPE(entry) ((unsigned long)entry & RADIX_DAX_TYPE_MASK)
> -#define RADIX_DAX_SECTOR(entry) (((unsigned long)entry >> RADIX_DAX_SHIFT))
> -#define RADIX_DAX_ENTRY(sector, pmd) ((void *)((unsigned long)sector << \
> -		RADIX_DAX_SHIFT | (pmd ? RADIX_DAX_PMD : RADIX_DAX_PTE) | \
> -		RADIX_TREE_EXCEPTIONAL_ENTRY))
> -
>  /* We choose 4096 entries - same as per-zone page wait tables */
>  #define DAX_WAIT_TABLE_BITS 12
>  #define DAX_WAIT_TABLE_ENTRIES (1 << DAX_WAIT_TABLE_BITS)
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index a3dfee4..e9ea78c 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -8,8 +8,21 @@
>  
>  struct iomap_ops;
>  
> -/* We use lowest available exceptional entry bit for locking */
> +/*
> + * We use lowest available bit in exceptional entry for locking, other two
> + * bits to determine entry type. In total 3 special bits.
> + */
> +#define RADIX_DAX_SHIFT	(RADIX_TREE_EXCEPTIONAL_SHIFT + 3)
>  #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
> +#define RADIX_DAX_PTE (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
> +#define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
> +#define RADIX_DAX_TYPE_MASK (RADIX_DAX_PTE | RADIX_DAX_PMD)
> +#define RADIX_DAX_TYPE(entry) ((unsigned long)entry & RADIX_DAX_TYPE_MASK)
> +#define RADIX_DAX_SECTOR(entry) (((unsigned long)entry >> RADIX_DAX_SHIFT))
> +#define RADIX_DAX_ENTRY(sector, pmd) ((void *)((unsigned long)sector << \
> +		RADIX_DAX_SHIFT | (pmd ? RADIX_DAX_PMD : RADIX_DAX_PTE) | \
> +		RADIX_TREE_EXCEPTIONAL_ENTRY))
> +
>  
>  ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
>  		struct iomap_ops *ops);
> -- 
> 2.7.4
> 
>