Re: [PATCH] zram: Always expose rw_page

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On (22/09/30 15:52), Brian Geffon wrote:
> Currently zram will adjust its fops to a version which does not
> contain rw_page when a backing device has been assigned. This is
> done to prevent upper layers from assuming a synchronous operation
> when a page may have been written back. This forces every operation
> through bio which has overhead associated with bio_alloc/frees.
> 
> The code can be simplified to always expose a rw_page method and
> only in the rare event that a page is written back we instead will
> return -EOPNOTSUPP forcing the upper layer to fallback to bio.

Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>

> @@ -1267,6 +1253,9 @@ static int __zram_bvec_read(struct zram *zram, struct page *page, u32 index,
>  		struct bio_vec bvec;
>  
>  		zram_slot_unlock(zram, index);
> +		/* If we don't have a bio we came via rw_page, we must fallback to bio */
> +		if (!bio)
> +			return -EOPNOTSUPP;

The comment is above 80 cols.




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux