Il 02/03/2012 04:22, Martin K. Petersen ha scritto:
> +int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
> + sector_t nr_sects, gfp_t gfp_mask)
> +{
> + if (bdev_write_same(bdev)) {
> + unsigned char bdn[BDEVNAME_SIZE];
> +
> + if (!blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask,
> + ZERO_PAGE(0)))
> + return 0;
> +
> + bdevname(bdev, bdn);
> + printk(KERN_ERR "%s: WRITE SAME failed. Manually zeroing.\n",
> + bdn);
> + }
> +
> + return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask);
> +}
Why not try DISCARD first if lbprz is true and the alignment is okay?
This doesn't even require WRITE SAME support in the disk.
Paolo
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