Re: [PATCH 4/4] xfs_repair: add post-phase error injection points

[Eric Sandeen <sandeen@sandeen.net>]

On 2/18/21 9:18 PM, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@kernel.org>
> 
> Create an error injection point so that we can simulate repair failing
> after a certain phase.
> 
> Signed-off-by: Darrick J. Wong <djwong@kernel.org>

Well this is refreshingly simple ;)

Reviewed-by: Eric Sandeen <sandeen@redhat.com>

> ---
>  repair/globals.c    |    3 +++
>  repair/globals.h    |    3 +++
>  repair/xfs_repair.c |    8 ++++++++
>  3 files changed, 14 insertions(+)
> 
> 
> diff --git a/repair/globals.c b/repair/globals.c
> index 110d98b6..537d068b 100644
> --- a/repair/globals.c
> +++ b/repair/globals.c
> @@ -117,3 +117,6 @@ uint64_t	*prog_rpt_done;
>  
>  int		ag_stride;
>  int		thread_count;
> +
> +/* If nonzero, simulate failure after this phase. */
> +int		fail_after_phase;
> diff --git a/repair/globals.h b/repair/globals.h
> index 1d397b35..a9287320 100644
> --- a/repair/globals.h
> +++ b/repair/globals.h
> @@ -162,4 +162,7 @@ extern uint64_t		*prog_rpt_done;
>  extern int		ag_stride;
>  extern int		thread_count;
>  
> +/* If nonzero, simulate failure after this phase. */
> +extern int		fail_after_phase;
> +
>  #endif /* _XFS_REPAIR_GLOBAL_H */
> diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
> index 891b3b23..33062170 100644
> --- a/repair/xfs_repair.c
> +++ b/repair/xfs_repair.c
> @@ -362,6 +362,10 @@ process_args(int argc, char **argv)
>  
>  	if (report_corrected && no_modify)
>  		usage();
> +
> +	p = getenv("XFS_REPAIR_FAIL_AFTER_PHASE");
> +	if (p)
> +		fail_after_phase = (int)strtol(p, NULL, 0);
>  }
>  
>  void __attribute__((noreturn))
> @@ -851,6 +855,10 @@ static inline void
>  phase_end(int phase)
>  {
>  	timestamp(PHASE_END, phase, NULL);
> +
> +	/* Fail if someone injected an post-phase error. */
> +	if (fail_after_phase && phase == fail_after_phase)
> +		platform_crash();
>  }
>  
>  int
>