linux-kernel - Re: [PATCH v7 05/22] Introduce IS

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Date:	Tue, 8 Apr 2014 17:32:55 +0200
From:	Jan Kara <jack@...e.cz>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, willy@...ux.intel.com
Subject: Re: [PATCH v7 05/22] Introduce IS_DAX(inode)

On Sun 23-03-14 15:08:31, Matthew Wilcox wrote:
> Use an inode flag to tag inodes which should avoid using the page cache.
> Convert ext2 to use it instead of mapping_is_xip().
  The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> 
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
> ---
>  fs/ext2/inode.c    | 9 ++++++---
>  fs/ext2/xip.h      | 2 --
>  include/linux/fs.h | 6 ++++++
>  3 files changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 94ed3684..e7d3192 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -731,7 +731,7 @@ static int ext2_get_blocks(struct inode *inode,
>  		goto cleanup;
>  	}
>  
> -	if (ext2_use_xip(inode->i_sb)) {
> +	if (IS_DAX(inode)) {
>  		/*
>  		 * we need to clear the block
>  		 */
> @@ -1201,7 +1201,7 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
>  
>  	inode_dio_wait(inode);
>  
> -	if (mapping_is_xip(inode->i_mapping))
> +	if (IS_DAX(inode))
>  		error = xip_truncate_page(inode->i_mapping, newsize);
>  	else if (test_opt(inode->i_sb, NOBH))
>  		error = nobh_truncate_page(inode->i_mapping,
> @@ -1273,7 +1273,8 @@ void ext2_set_inode_flags(struct inode *inode)
>  {
>  	unsigned int flags = EXT2_I(inode)->i_flags;
>  
> -	inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
> +	inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
> +				S_DIRSYNC | S_DAX);
>  	if (flags & EXT2_SYNC_FL)
>  		inode->i_flags |= S_SYNC;
>  	if (flags & EXT2_APPEND_FL)
> @@ -1284,6 +1285,8 @@ void ext2_set_inode_flags(struct inode *inode)
>  		inode->i_flags |= S_NOATIME;
>  	if (flags & EXT2_DIRSYNC_FL)
>  		inode->i_flags |= S_DIRSYNC;
> +	if (test_opt(inode->i_sb, XIP))
> +		inode->i_flags |= S_DAX;
>  }
>  
>  /* Propagate flags from i_flags to EXT2_I(inode)->i_flags */
> diff --git a/fs/ext2/xip.h b/fs/ext2/xip.h
> index 18b34d2..29be737 100644
> --- a/fs/ext2/xip.h
> +++ b/fs/ext2/xip.h
> @@ -16,9 +16,7 @@ static inline int ext2_use_xip (struct super_block *sb)
>  }
>  int ext2_get_xip_mem(struct address_space *, pgoff_t, int,
>  				void **, unsigned long *);
> -#define mapping_is_xip(map) unlikely(map->a_ops->get_xip_mem)
>  #else
> -#define mapping_is_xip(map)			0
>  #define ext2_xip_verify_sb(sb)			do { } while (0)
>  #define ext2_use_xip(sb)			0
>  #define ext2_clear_xip_target(inode, chain)	0
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 23b2a35..47fd219 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1644,6 +1644,7 @@ struct super_operations {
>  #define S_IMA		1024	/* Inode has an associated IMA struct */
>  #define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
>  #define S_NOSEC		4096	/* no suid or xattr security attributes */
> +#define S_DAX		8192	/* Direct Access, avoiding the page cache */
>  
>  /*
>   * Note that nosuid etc flags are inode-specific: setting some file-system
> @@ -1681,6 +1682,11 @@ struct super_operations {
>  #define IS_IMA(inode)		((inode)->i_flags & S_IMA)
>  #define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
>  #define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
> +#ifdef CONFIG_FS_XIP
> +#define IS_DAX(inode)		((inode)->i_flags & S_DAX)
> +#else
> +#define IS_DAX(inode)		0
> +#endif
>  
>  /*
>   * Inode state bits.  Protected by inode->i_lock
> -- 
> 1.9.0
> 
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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