Re: [PATCH 1/2] fiemap: Factor out actual fiemap call code

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Fri, Oct 27, 2017 at 09:33:20AM -0700, Darrick J. Wong wrote:
> On Fri, Oct 27, 2017 at 03:37:09PM +0300, Nikolay Borisov wrote:
> > This will be needed to in a subsequent patch to avoid code duplication. No 
> > functional changes
> > 
> > Signed-off-by: Nikolay Borisov <nborisov@suse.com>
> > ---
> >  io/fiemap.c | 38 +++++++++++++++++++++++++++-----------
> >  1 file changed, 27 insertions(+), 11 deletions(-)
> > 
> > diff --git a/io/fiemap.c b/io/fiemap.c
> > index e6fd66da753d..4a52bff974e8 100644
> > --- a/io/fiemap.c
> > +++ b/io/fiemap.c
> > @@ -211,6 +211,30 @@ calc_print_format(
> >  	}
> >  }
> >  
> > +static int
> > +__fiemap(struct fiemap * fiemap,
> 
> Function parameter should be on a separate line.
> 
> > +	 int		 mapsize,
> > +	 __u32		 flags,
> > +	 __u64		 start,
> > +	 __u64		 length) {
> > +
> > +	int ret;
> > +
> > +	memset(fiemap, 0, mapsize);
> > +        fiemap->fm_flags = flags;
> 
> Space/tab indent problems.
> 
> > +        fiemap->fm_start = start;
> > +        fiemap->fm_length = length;
> > +        fiemap->fm_extent_count = EXTENT_BATCH;
> > +	ret = ioctl(file->fd, FS_IOC_FIEMAP, (unsigned long)fiemap);
> 
> Do we still need the unsigned long cast?
> 
> --D
> 
> > +	if (ret < 0) {
> > +	        fprintf(stderr, "%s: ioctl(FS_IOC_FIEMAP) [\"%s\"]: "
> > +	                "%s\n", progname, file->name, strerror(errno));
> > +	        return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >  int
> >  fiemap_f(
> >  	int		argc,
> > @@ -266,19 +290,11 @@ fiemap_f(
> >  
> >  	while (!last && (cur_extent != max_extents)) {
> >  
> > -		memset(fiemap, 0, map_size);
> > -		fiemap->fm_flags = fiemap_flags;
> > -		fiemap->fm_start = last_logical;
> > -		fiemap->fm_length = -1LL;
> > -		fiemap->fm_extent_count = EXTENT_BATCH;
> > -
> > -		ret = ioctl(file->fd, FS_IOC_FIEMAP, (unsigned long)fiemap);
> > +		ret = __fiemap(fiemap, map_size, fiemap_flags, last_logical,
> > +			       len - covered_length);

Also, where did covered_length come from?  Isn't that in patch 3?

--D

> >  		if (ret < 0) {
> > -			fprintf(stderr, "%s: ioctl(FS_IOC_FIEMAP) [\"%s\"]: "
> > -				"%s\n", progname, file->name, strerror(errno));
> > -			free(fiemap);
> >  			exitcode = 1;
> > -			return 0;
> > +			goto out;
> >  		}
> >  
> >  		/* No more extents to map, exit */
> > -- 
> > 2.7.4
> > 
> > --
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