[U-Boot] [PATCH v2 3/3] efi_loader: disk: install file system protocol to a whole disk

[AKASHI Takahiro]

Heinrich,

On Thu, Sep 12, 2019 at 11:21:51AM +0200, Heinrich Schuchardt wrote:
> On 9/12/19 6:51 AM, AKASHI Takahiro wrote:
> > Currently, a whole disk without any partitions is not associated
> > with EFI_SIMPLE_FILE_SYSTEM_PROTOCOL. So even if it houses FAT
> > file system, there is a chance that we may not be able to access
> > it, particularly, when accesses are to be attempted after searching
> > that protocol against a device handle.
> >
> > With this patch, EFI_SIMPLE_FILE_SYSTEM_PROTOCOL is installed
> > to such a disk if part_get_info() shows there is not partition
> > table installed on it.
> >
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > ---
> >  lib/efi_loader/efi_disk.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > index d72f455901f2..d36f22cedc52 100644
> > --- a/lib/efi_loader/efi_disk.c
> > +++ b/lib/efi_loader/efi_disk.c
> > @@ -253,6 +253,7 @@ static efi_status_t efi_disk_add_dev(
> >  				struct efi_disk_obj **disk)
> >  {
> >  	struct efi_disk_obj *diskobj;
> > +	disk_partition_t info;
> >  	efi_status_t ret;
> >
> >  	/* Don't add empty devices */
> > @@ -284,7 +285,9 @@ static efi_status_t efi_disk_add_dev(
> >  			       diskobj->dp);
> >  	if (ret != EFI_SUCCESS)
> >  		return ret;
> > -	if (part >= 1 && efi_fs_exists(desc, part)) {
> > +	/* partitions or whole disk without partitions */
> > +	if ((part >= 1 || part_get_info(desc, part, &info)) &&
> 
> part_get_info() returns -1 for part = 0 on a DOS partioned disk. So this
> check does not work.

Right.
So this statement should be simplified like:
        if (efi_fs_exists(desc, part)) {
                diskobj->volume = efi_simple_file_system(desc, part,
                                                         diskobj->dp);
                ret = efi_add_protocol(&diskobj->header,
                ...
        }

-Takahiro Akashi


> Best regards
> 
> Heinrich
> 
> > +	    efi_fs_exists(desc, part)) {
> >  		diskobj->volume = efi_simple_file_system(desc, part,
> >  							 diskobj->dp);
> >  		ret = efi_add_protocol(&diskobj->header,
> >
>