Re: [PATCH encrypted swsusp 1/3] core functionality

[Pavel Machek <pavel@ucw.cz>]

Hi!

> I had no time to review your patch earlier, sorry.  I'm inlining it so that I can
> comment it:

> > @@ -72,6 +75,16 @@
> >  
> >  #include "power.h"
> >  
> > +#ifdef CONFIG_SWSUSP_ENCRYPT
> > +#include <linux/random.h>
> > +#include <linux/crypto.h>
> > +#include <asm/scatterlist.h>
> > +#endif
> > +
> > +#define CIPHER "aes"
> > +#define MAXKEY 32
> > +#define MAXIV  32
> 
> Why not to put these definitions under #ifdef?
> 
> > +
> >  /* References to section boundaries */
> >  extern const void __nosave_begin, __nosave_end;
> >  
> > @@ -104,7 +117,9 @@
> >  #define SWSUSP_SIG	"S1SUSPEND"
> >  
> >  static struct swsusp_header {
> > -	char reserved[PAGE_SIZE - 20 - sizeof(swp_entry_t)];
> 
> I would add #ifdef here as well.

I think avoiding both ifdefs is actually right thing to do. Keep the
ifdef noise down.

> > +	char reserved[PAGE_SIZE - 20 - MAXKEY - MAXIV - sizeof(swp_entry_t)];
> > +	u8 key[MAXKEY];
> > +	u8 iv[MAXIV];
> >  	swp_entry_t swsusp_info;
> >  	char	orig_sig[10];
> >  	char	sig[10];
> > @@ -112,6 +127,11 @@
> >  
> >  static struct swsusp_info swsusp_info;
> >  
> > +#ifdef CONFIG_SWSUSP_ENCRYPT
> > +static u8 key[MAXKEY];
> > +static u8 iv[MAXIV];
> > +#endif
> > +
> >  /*
> >   * XXX: We try to keep some more pages free so that I/O operations succeed
> >   * without paging. Might this be more?
> > @@ -130,6 +150,52 @@
> >  static unsigned short swapfile_used[MAX_SWAPFILES];
> >  static unsigned short root_swap;
> >  
> > +#ifdef CONFIG_SWSUSP_ENCRYPT
> > +static struct crypto_tfm *crypto_init(int mode)
> 
> I think it's better if this function returns an int error code and the
> messages are printed where it's called from.  This way, the essential
> part of the code would be easier to grasp (Pavel?).

Agreed. Actually I do not care where messages are printed, but
returning different code for different errors seems right.

							Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.