[U-Boot] [PATCH 06/17] fs: fat: write returns error code instead of -1

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Fri, Jul 20, 2018 at 07:55:06PM +0200, Heinrich Schuchardt wrote:
> On 07/20/2018 04:57 AM, AKASHI Takahiro wrote:
> > It would be good that FAT write function return error code instead of
> > just returning -1 as fat_read_file() does.
> > This patch attempts to address this issue although it is 'best effort
> > (or estimate)' for now.
> > 
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> 
> Some of the error message are written with debug() others with printf().

Right, but as you know, there is already a mixture of debug() and
printf() in the existing code.
Here I tried to do my best to use either one so as to make the usage
consistent with existing code though I don't know the exact discipline.

> Shouldn't we switch everything to debug() so that the EFI console is not
> messed up?

Is this a different issue, isn't it?
(I suppose that one of Rob's patches tried to address this issue.)

So I'd like to listen to any opinion from other folks, too.

Thanks,
-Takahiro AKASHI

> Best regards
> 
> Heinrich
> 
> > ---
> >  fs/fat/fat_write.c | 19 +++++++++++++++----
> >  1 file changed, 15 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
> > index 6c715a70f4..1e4f5af910 100644
> > --- a/fs/fat/fat_write.c
> > +++ b/fs/fat/fat_write.c
> > @@ -956,7 +956,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  
> >  	if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
> >  		debug("error: reading boot sector\n");
> > -		return -1;
> > +		return -EIO;
> >  	}
> >  
> >  	total_sector = bs.total_sect;
> > @@ -997,7 +997,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  	mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
> >  	if (mydata->fatbuf == NULL) {
> >  		debug("Error: allocating memory\n");
> > -		return -1;
> > +		return -ENOMEM;
> >  	}
> >  
> >  	if (disk_read(cursect,
> > @@ -1005,6 +1005,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  		(mydata->clust_size) :
> >  		PREFETCH_BLOCKS, do_fat_read_at_block) < 0) {
> >  		debug("Error: reading rootdir block\n");
> > +		ret = -EIO;
> >  		goto exit;
> >  	}
> >  	dentptr = (dir_entry *) do_fat_read_at_block;
> > @@ -1029,6 +1030,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  							size);
> >  				if (ret) {
> >  					printf("Error: %llu overflow\n", size);
> > +					ret = -ENOSPC;
> >  					goto exit;
> >  				}
> >  			}
> > @@ -1036,6 +1038,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  			ret = clear_fatent(mydata, start_cluster);
> >  			if (ret) {
> >  				printf("Error: clearing FAT entries\n");
> > +				ret = -EIO;
> >  				goto exit;
> >  			}
> >  
> > @@ -1045,12 +1048,14 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  			ret = start_cluster = find_empty_cluster(mydata);
> >  			if (ret < 0) {
> >  				printf("Error: finding empty cluster\n");
> > +				ret = -ENOSPC;
> >  				goto exit;
> >  			}
> >  
> >  			ret = check_overflow(mydata, start_cluster, size);
> >  			if (ret) {
> >  				printf("Error: %llu overflow\n", size);
> > +				ret = -ENOSPC;
> >  				goto exit;
> >  			}
> >  
> > @@ -1065,12 +1070,14 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  			ret = start_cluster = find_empty_cluster(mydata);
> >  			if (ret < 0) {
> >  				printf("Error: finding empty cluster\n");
> > +				ret = -ENOSPC;
> >  				goto exit;
> >  			}
> >  
> >  			ret = check_overflow(mydata, start_cluster, size);
> >  			if (ret) {
> >  				printf("Error: %llu overflow\n", size);
> > +				ret = -ENOSPC;
> >  				goto exit;
> >  			}
> >  		} else {
> > @@ -1087,6 +1094,7 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  	ret = set_contents(mydata, retdent, buffer, size, actwrite);
> >  	if (ret < 0) {
> >  		printf("Error: writing contents\n");
> > +		ret = -EIO;
> >  		goto exit;
> >  	}
> >  	debug("attempt to write 0x%llx bytes\n", *actwrite);
> > @@ -1095,14 +1103,17 @@ static int do_fat_write(const char *filename, void *buffer, loff_t size,
> >  	ret = flush_dirty_fat_buffer(mydata);
> >  	if (ret) {
> >  		printf("Error: flush fat buffer\n");
> > +		ret = -EIO;
> >  		goto exit;
> >  	}
> >  
> >  	/* Write directory table to device */
> >  	ret = set_cluster(mydata, dir_curclust, get_dentfromdir_block,
> >  			mydata->clust_size * mydata->sect_size);
> > -	if (ret)
> > +	if (ret) {
> >  		printf("Error: writing directory entry\n");
> > +		ret = -EIO;
> > +	}
> >  
> >  exit:
> >  	free(mydata->fatbuf);
> > @@ -1114,7 +1125,7 @@ int file_fat_write(const char *filename, void *buffer, loff_t offset,
> >  {
> >  	if (offset != 0) {
> >  		printf("Error: non zero offset is currently not supported.\n");
> > -		return -1;
> > +		return -EINVAL;
> >  	}
> >  
> >  	printf("writing %s\n", filename);
> > 
>