Re: [PATCH 2/5] xfs: remove unnecessary parameter from scrub_scan_estimate_blocks

[Allison Henderson <allison.henderson@xxxxxxxxxx>]

On 10/29/20 11:33 AM, Darrick J. Wong wrote:
> On Tue, Oct 27, 2020 at 08:33:50AM -0700, Darrick J. Wong wrote:
> > On Mon, Oct 26, 2020 at 10:35:46PM -0700, Allison Henderson wrote:
> > > On 10/26/20 4:32 PM, Darrick J. Wong wrote:
> > > > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> > > >
> > > > The only caller that cares about the file counts uses it to compute the
> > > > number of files used, so return that and save a parameter.
> > > >
> > > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> > > > ---
> > > >    scrub/fscounters.c |    8 +++-----
> > > >    scrub/fscounters.h |    2 +-
> > > >    scrub/phase6.c     |    7 +++----
> > > >    scrub/phase7.c     |    5 +----
> > > >    4 files changed, 8 insertions(+), 14 deletions(-)
> > > >
> > > >
> > > > diff --git a/scrub/fscounters.c b/scrub/fscounters.c
> > > > index e9901fcdf6df..9a240d49477b 100644
> > > > --- a/scrub/fscounters.c
> > > > +++ b/scrub/fscounters.c
> > > > @@ -116,7 +116,7 @@ scrub_count_all_inodes(
> > > >    }
> > > >    /*
> > > > - * Estimate the number of blocks and inodes in the filesystem.  Returns 0
> > > > + * Estimate the number of blocks and used inodes in the filesystem.  Returns 0
> > > >     * or a positive error number.
> > > >     */
> > > >    int
> > > > @@ -126,8 +126,7 @@ scrub_scan_estimate_blocks(
> > > >    	unsigned long long		*d_bfree,
> > > >    	unsigned long long		*r_blocks,
> > > >    	unsigned long long		*r_bfree,
> > > > -	unsigned long long		*f_files,
> > > > -	unsigned long long		*f_free)
> > > > +	unsigned long long		*f_files_used)
> > > >    {
> > > >    	struct xfs_fsop_counts		fc;
> > > >    	int				error;
> > > > @@ -141,8 +140,7 @@ scrub_scan_estimate_blocks(
> > > >    	*d_bfree = fc.freedata;
> > > >    	*r_blocks = ctx->mnt.fsgeom.rtblocks;
> > > >    	*r_bfree = fc.freertx;
> > > > -	*f_files = fc.allocino;
> > > > -	*f_free = fc.freeino;
> > > > +	*f_files_used = fc.allocino - fc.freeino;
> > > Just a nit, I think I might have put in:
> > > 	if(f_files_used)
> > > 		*f_files_used = fc.allocino - fc.freeino;
> > >
> > > That way calling functions that don't care can just pass NULL, instead of
> > > declaring a "dontcare" variable that has no other use.  Though I suppose
> > > none of the other variables do that.
> >
> > <shrug> There's only two callers, and they both pass a pointer, so I
> > didn't bother...
>
> ...and one of those callers is to a dontcare variable; and that's what
> you were talking about.
>
> Er... I don't mind changing it, but I'll leave that to Eric's
> discretion.
>
> --D
No worries, it's not a huge detail, I just thought I'd throw the 
suggestion out is all :-)

Allison

> > --D
> >
> > > Reviewed-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
> > > Allison
> > > >    	return 0;
> > > >    }
> > > > diff --git a/scrub/fscounters.h b/scrub/fscounters.h
> > > > index 1fae58a6b287..13bd9967f004 100644
> > > > --- a/scrub/fscounters.h
> > > > +++ b/scrub/fscounters.h
> > > > @@ -9,7 +9,7 @@
> > > >    int scrub_scan_estimate_blocks(struct scrub_ctx *ctx,
> > > >    		unsigned long long *d_blocks, unsigned long long *d_bfree,
> > > >    		unsigned long long *r_blocks, unsigned long long *r_bfree,
> > > > -		unsigned long long *f_files, unsigned long long *f_free);
> > > > +		unsigned long long *f_files_used);
> > > >    int scrub_count_all_inodes(struct scrub_ctx *ctx, uint64_t *count);
> > > >    #endif /* XFS_SCRUB_FSCOUNTERS_H_ */
> > > > diff --git a/scrub/phase6.c b/scrub/phase6.c
> > > > index 8d976732d8e1..87828b60fbed 100644
> > > > --- a/scrub/phase6.c
> > > > +++ b/scrub/phase6.c
> > > > @@ -719,12 +719,11 @@ phase6_estimate(
> > > >    	unsigned long long	d_bfree;
> > > >    	unsigned long long	r_blocks;
> > > >    	unsigned long long	r_bfree;
> > > > -	unsigned long long	f_files;
> > > > -	unsigned long long	f_free;
> > > > +	unsigned long long	dontcare;
> > > >    	int			ret;
> > > > -	ret = scrub_scan_estimate_blocks(ctx, &d_blocks, &d_bfree,
> > > > -				&r_blocks, &r_bfree, &f_files, &f_free);
> > > > +	ret = scrub_scan_estimate_blocks(ctx, &d_blocks, &d_bfree, &r_blocks,
> > > > +			&r_bfree, &dontcare);
> > > >    	if (ret) {
> > > >    		str_liberror(ctx, ret, _("estimating verify work"));
> > > >    		return ret;
> > > > diff --git a/scrub/phase7.c b/scrub/phase7.c
> > > > index 96876f7c0596..bc652ab6f44a 100644
> > > > --- a/scrub/phase7.c
> > > > +++ b/scrub/phase7.c
> > > > @@ -111,8 +111,6 @@ phase7_func(
> > > >    	unsigned long long	d_bfree;
> > > >    	unsigned long long	r_blocks;
> > > >    	unsigned long long	r_bfree;
> > > > -	unsigned long long	f_files;
> > > > -	unsigned long long	f_free;
> > > >    	bool			complain;
> > > >    	int			ip;
> > > >    	int			error;
> > > > @@ -160,7 +158,7 @@ phase7_func(
> > > >    	}
> > > >    	error = scrub_scan_estimate_blocks(ctx, &d_blocks, &d_bfree, &r_blocks,
> > > > -			&r_bfree, &f_files, &f_free);
> > > > +			&r_bfree, &used_files);
> > > >    	if (error) {
> > > >    		str_liberror(ctx, error, _("estimating verify work"));
> > > >    		return error;
> > > > @@ -177,7 +175,6 @@ phase7_func(
> > > >    	/* Report on what we found. */
> > > >    	used_data = cvt_off_fsb_to_b(&ctx->mnt, d_blocks - d_bfree);
> > > >    	used_rt = cvt_off_fsb_to_b(&ctx->mnt, r_blocks - r_bfree);
> > > > -	used_files = f_files - f_free;
> > > >    	stat_data = totalcount.dbytes;
> > > >    	stat_rt = totalcount.rbytes;