linux-ext4 - Re: + ext2-get-rid-of-most-mentions-of-xip-in-ext2.patch added to -mm tree

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Message-ID: <20150115103036.GE12739@quack.suse.cz>
Date:	Thu, 15 Jan 2015 11:30:36 +0100
From:	Jan Kara <jack@...e.cz>
To:	matthew.r.wilcox@...el.com
Cc:	akpm@...ux-foundation.org, andreas.dilger@...el.com,
	axboe@...nel.dk, boaz@...xistor.com, david@...morbit.com,
	hch@....de, jack@...e.cz, kirill.shutemov@...ux.intel.com,
	mathieu.desnoyers@...icios.com, rdunlap@...radead.org,
	ross.zwisler@...ux.intel.com, tytso@....edu,
	mm-commits@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: + ext2-get-rid-of-most-mentions-of-xip-in-ext2.patch added to
 -mm tree

On Mon 12-01-15 15:11:11, Andrew Morton wrote:
...
> diff -puN fs/ext2/ext2.h~ext2-get-rid-of-most-mentions-of-xip-in-ext2 fs/ext2/ext2.h
> --- a/fs/ext2/ext2.h~ext2-get-rid-of-most-mentions-of-xip-in-ext2
> +++ a/fs/ext2/ext2.h
> @@ -380,14 +380,15 @@ struct ext2_inode {
>  #define EXT2_MOUNT_NO_UID32		0x000200  /* Disable 32-bit UIDs */
>  #define EXT2_MOUNT_XATTR_USER		0x004000  /* Extended user attributes */
>  #define EXT2_MOUNT_POSIX_ACL		0x008000  /* POSIX Access Control Lists */
> -#ifdef CONFIG_FS_DAX
> -#define EXT2_MOUNT_XIP			0x010000  /* Execute in place */
> -#else
> -#define EXT2_MOUNT_XIP			0
> -#endif
> +#define EXT2_MOUNT_XIP			0x010000  /* Obsolete, use DAX */
>  #define EXT2_MOUNT_USRQUOTA		0x020000  /* user quota */
>  #define EXT2_MOUNT_GRPQUOTA		0x040000  /* group quota */
>  #define EXT2_MOUNT_RESERVATION		0x080000  /* Preallocation */
> +#ifdef CONFIG_FS_DAX
> +#define EXT2_MOUNT_DAX			0x100000  /* Direct Access */
> +#else
> +#define EXT2_MOUNT_DAX			0
> +#endif
  Why do you define EXT2_MOUNT_DAX differently depending on CONFIG_FS_DAX?
  That seems unnecessary...

...
> diff -puN fs/ext2/super.c~ext2-get-rid-of-most-mentions-of-xip-in-ext2 fs/ext2/super.c
> --- a/fs/ext2/super.c~ext2-get-rid-of-most-mentions-of-xip-in-ext2
> +++ a/fs/ext2/super.c
> @@ -294,6 +294,8 @@ static int ext2_show_options(struct seq_
>  #ifdef CONFIG_FS_DAX
>  	if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
>  		seq_puts(seq, ",xip");
> +	if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
> +		seq_puts(seq, ",dax");
>  #endif
>  
>  	if (!test_opt(sb, RESERVATION))
  So if someone mounts filesystem with -o xip, /proc/mounts will show both
'xip' and 'dax'. OK, probably makes sense.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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