[Ocfs2-tools-devel] [PATCH 1/2] ocfs2-tools: Set hash seed when convert ocfs2 to support indexed-dirs

[Sunil Mushran]

Acked-by: Sunil Mushran<sunil.mushran at oracle.com>


On 02/14/2011 11:13 PM, Tiger Yang wrote:
> The hash seed should be set in super block when convert ocfs2
> to support indexed-dirs with tunefs.ocfs2, and it should be clear
> when disable indexed-dirs.
>
> Signed-off-by: Tiger Yang<tiger.yang at oracle.com>
> ---
>   tunefs.ocfs2/feature_indexed_dirs.c |    9 +++++++++
>   1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/tunefs.ocfs2/feature_indexed_dirs.c b/tunefs.ocfs2/feature_indexed_dirs.c
> index 7a918e7..5cdc86c 100644
> --- a/tunefs.ocfs2/feature_indexed_dirs.c
> +++ b/tunefs.ocfs2/feature_indexed_dirs.c
> @@ -117,6 +117,12 @@ static int enable_indexed_dirs(ocfs2_filesys *fs, int flags)
>   		goto out;
>   	}
>
> +	/* set seed for indexed dir hash */
> +	srand48(time(NULL));
> +	super->s_dx_seed[0] = mrand48();
> +	super->s_dx_seed[1] = mrand48();
> +	super->s_dx_seed[2] = mrand48();
> +
>   	OCFS2_SET_INCOMPAT_FEATURE(super,
>   				   OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS);
>
> @@ -302,6 +308,9 @@ static int disable_indexed_dirs(ocfs2_filesys *fs, int flags)
>   	 * fsck.ocfs2 will handle the orphan indexed trees. */
>   	OCFS2_CLEAR_INCOMPAT_FEATURE(super,
>   				     OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS);
> +
> +	super->s_dx_seed[0] = super->s_dx_seed[1] = super->s_dx_seed[2] = 0;
> +
>   	ret = ocfs2_write_super(fs);
>   	tunefs_unblock_signals();
>