Re: [PATCH 02/13] sg_io: reorganize list of allowed commands

Tejun Heo
2013-01-24T22:42:16Z

On Thu, Jan 24, 2013 at 04:00:38PM +0100, Paolo Bonzini wrote:
> +#define sgio_bitmap_set(cmd, mask, rw) \
> + if ((mask) != 0) __set_bit((cmd), filter->rw##_ok)
> +
> +#define D (1u << TYPE_DISK) /* Direct Access Block Device (SBC-3) */
> +#define T (1u << TYPE_TAPE) /* Sequential Access Device (SSC-3) */
> +#define L (1u << TYPE_PRINTER) /* Printer Device (SSC) */
> +#define P (1u << TYPE_PROCESSOR) /* Processor Device (SPC-2) */
> +#define W (1u << TYPE_WORM) /* Write Once Block Device (SBC) */
> +#define R (1u << TYPE_ROM) /* C/DVD Device (MMC-6) */
> +#define S (1u << TYPE_SCANNER) /* Scanner device (obsolete) */
> +#define O (1u << TYPE_MOD) /* Optical Memory Block Device (SBC) */
> +#define M (1u << TYPE_MEDIUM_CHANGER) /* Media Changer Device (SMC-3) */
> +#define C (1u << TYPE_COMM) /* Communication devices (obsolete) */
> +#define A (1u << TYPE_RAID) /* Storage Array Device (SCC-2) */
> +#define E (1u << TYPE_ENCLOSURE) /* SCSI Enclosure Services device (SES-2) */
> +#define B (1u << TYPE_RBC) /* Simplified Direct-Access (Reduced Block) device (RBC) */
> +#define K (1u << 0x0f) /* Optical Card Reader/Writer device (OCRW) */
> +#define V (1u << 0x10) /* Automation/Device Interface device (ADC-2) */

Can we please add TYPE_* constants for these two too?

> +#define F (1u << TYPE_OSD) /* Object-based Storage Device (OSD-2) */
> +
> + /* control, universal except possibly RBC, read */
> +
> + sgio_bitmap_set(0x00, -1 , read); // TEST UNIT READY

Hmmm... why are we not using symbolic constants for commands? If it's
because of horizontal real estate, we can abbreviate
sgio_bitmap_set(), no? Also, wouldn't it be better to have ALL
instead of -1? Also, the custom formatting is nice but can we at
least not use //?

One other thing is I would much prefer if the table was made static
const first. As we only allow compile-time defined tables, there's no
point in dynamically initializing these and the above can be static
initializers.

Thanks.

--
tejun