Re: [PATCH 1/4] xfs: make inode64 as the default allocation mode

[Dave Chinner <david@fromorbit.com>]

On Mon, Sep 17, 2012 at 01:51:39PM -0300, Carlos Maiolino wrote:
> since 64-bit inodes can be accessed while using inode32, and these can also be
> used on 32-bit kernels, there is no reason to still keep inode32 as the default
> mount option.

This needs to explain why XFS_MOUNT_SMALL_INUMS is still the default
for !XFS_BIG_INUMS. i.e. inode64 is not an unconditional default
value.

> 
> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
> ---
>  fs/xfs/xfs_super.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index f1f2968..b1aa2db 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -88,6 +88,8 @@ mempool_t *xfs_ioend_pool;
>  					 * unwritten extent conversion */
>  #define MNTOPT_NOBARRIER "nobarrier"	/* .. disable */
>  #define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */
> +#define MNTOPT_32BITINODE   "inode32"	/* inode allocation limited to
> +					 * XFS_MAXINUMBER_32 */
>  #define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
>  #define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */
>  #define MNTOPT_LARGEIO	   "largeio"	/* report large I/O sizes in stat() */
> @@ -198,7 +200,9 @@ xfs_parseargs(
>  	 */
>  	mp->m_flags |= XFS_MOUNT_BARRIER;
>  	mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
> +#if !XFS_BIG_INUMS
>  	mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
> +#endif
>  
>  	/*
>  	 * These can be overridden by the mount option parsing.
> @@ -295,6 +299,8 @@ xfs_parseargs(
>  				return EINVAL;
>  			}
>  			dswidth = simple_strtoul(value, &eov, 10);
> +		} else if (!strcmp(this_char, MNTOPT_32BITINODE)) {
> +			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
>  		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
>  			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
>  #if !XFS_BIG_INUMS
> @@ -493,13 +499,13 @@ xfs_showargs(
>  		{ XFS_MOUNT_FILESTREAMS,	"," MNTOPT_FILESTREAM },
>  		{ XFS_MOUNT_GRPID,		"," MNTOPT_GRPID },
>  		{ XFS_MOUNT_DISCARD,		"," MNTOPT_DISCARD },
> +		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_32BITINODE },
>  		{ 0, NULL }
>  	};
>  	static struct proc_xfs_info xfs_info_unset[] = {
>  		/* the few simple ones we can get from the mount struct */
>  		{ XFS_MOUNT_COMPAT_IOSIZE,	"," MNTOPT_LARGEIO },
>  		{ XFS_MOUNT_BARRIER,		"," MNTOPT_NOBARRIER },
> -		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_64BITINODE },

I'd leave that in the table, that way people will still know if they
are using inode64 or not by grepping /proc/self/mounts.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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