Re: [PATCH] xfs: fix broken log reservation debugging

[Brian Foster <bfoster@redhat.com>]

On Thu, May 23, 2019 at 09:02:19AM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> xlog_print_tic_res() is supposed to print a human readable string for
> each element of the log ticket reservation array.  Unfortunately, I
> forgot to update the string array when we added rmap & reflink support,
> so the debug message prints "region[3]: (null) - 352 bytes" which isn't
> useful at all.  Add the missing elements and add a build check so that
> we don't forget again to add a string when adding a new XLOG_REG_TYPE.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/xfs_log.c |   11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> index 457ced3ee3e1..2466b0f5b6c4 100644
> --- a/fs/xfs/xfs_log.c
> +++ b/fs/xfs/xfs_log.c
> @@ -2069,7 +2069,7 @@ xlog_print_tic_res(
>  
>  	/* match with XLOG_REG_TYPE_* in xfs_log.h */
>  #define REG_TYPE_STR(type, str)	[XLOG_REG_TYPE_##type] = str
> -	static char *res_type_str[XLOG_REG_TYPE_MAX + 1] = {
> +	static char *res_type_str[] = {
>  	    REG_TYPE_STR(BFORMAT, "bformat"),
>  	    REG_TYPE_STR(BCHUNK, "bchunk"),
>  	    REG_TYPE_STR(EFI_FORMAT, "efi_format"),
> @@ -2089,8 +2089,15 @@ xlog_print_tic_res(
>  	    REG_TYPE_STR(UNMOUNT, "unmount"),
>  	    REG_TYPE_STR(COMMIT, "commit"),
>  	    REG_TYPE_STR(TRANSHDR, "trans header"),
> -	    REG_TYPE_STR(ICREATE, "inode create")
> +	    REG_TYPE_STR(ICREATE, "inode create"),
> +	    REG_TYPE_STR(RUI_FORMAT, "rui_format"),
> +	    REG_TYPE_STR(RUD_FORMAT, "rud_format"),
> +	    REG_TYPE_STR(CUI_FORMAT, "cui_format"),
> +	    REG_TYPE_STR(CUD_FORMAT, "cud_format"),
> +	    REG_TYPE_STR(BUI_FORMAT, "bui_format"),
> +	    REG_TYPE_STR(BUD_FORMAT, "bud_format"),
>  	};
> +	BUILD_BUG_ON(ARRAY_SIZE(res_type_str) != XLOG_REG_TYPE_MAX + 1);
>  #undef REG_TYPE_STR
>  
>  	xfs_warn(mp, "ticket reservation summary:");