detecting case-insensitivity

[Dave Chinner]

On Mon, Apr 30, 2012 at 05:26:49PM -0400, J. Bruce Fields wrote:
> On Wed, Apr 11, 2012 at 04:37:35PM -0400, J. Bruce Fields wrote:
> > On Wed, Apr 11, 2012 at 04:03:35PM -0400, Christoph Hellwig wrote:
> > > Can you add a new s_feature_flags instead of s_flags which is shared
> > > with the mount user ABI?  MS_I_VERSION should also move there.
> > 
> > I was wondering about that.  Yes, that makes a lot more sense, I'll work
> > on it.
> 
> Just something like this?

.....

>  #define S_SYNC		1	/* Writes are synced at once */
> @@ -268,7 +271,7 @@ struct inodes_stat_t {
>  					((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
>  #define IS_MANDLOCK(inode)	__IS_FLG(inode, MS_MANDLOCK)
>  #define IS_NOATIME(inode)   __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
> -#define IS_I_VERSION(inode)   __IS_FLG(inode, MS_I_VERSION)
> +#define IS_I_VERSION(inode)  ((inode)->i_sb->s_flags & SF_I_VERSION)

(inode)->i_sb->s_feature_flags?

>  #define IS_NOQUOTA(inode)	((inode)->i_flags & S_NOQUOTA)
>  #define IS_APPEND(inode)	((inode)->i_flags & S_APPEND)
> @@ -1428,7 +1431,8 @@ struct super_block {
>  	const struct dquot_operations	*dq_op;
>  	const struct quotactl_ops	*s_qcop;
>  	const struct export_operations *s_export_op;
> -	unsigned long		s_flags;
> +	unsigned long		s_flags; /* mount flags */
> +	unsigned int		s_feature_flags;

why not an unsigned long like s_flags?

Cheers,

Dave.

-- 
Dave Chinner
david at fromorbit.com