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zram: implement REQ_OP_WRITE_ZEROES 

Just the same as discard if the block size equals the system page size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-04-05 19:21:14 +02:00 committed by Jens Axboe
parent e850fd16f7
commit 31edeacd77
1 changed files with 8 additions and 5 deletions
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13
drivers/block/zram/zram_drv.c
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@ -829,10 +829,14 @@ static void __zram_make_request(struct zram *zram, struct bio *bio)
offset = (bio->bi_iter.bi_sector &
(SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT;
if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) {
switch (bio_op(bio)) {
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
zram_bio_discard(zram, index, offset, bio);
bio_endio(bio);
return;
default:
break;
}
bio_for_each_segment(bvec, bio, iter) {
@ -1192,6 +1196,8 @@ static int zram_add(void)
zram->disk->queue->limits.max_sectors = SECTORS_PER_PAGE;
zram->disk->queue->limits.chunk_sectors = 0;
blk_queue_max_discard_sectors(zram->disk->queue, UINT_MAX);
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue);
/*
* zram_bio_discard() will clear all logical blocks if logical block
* size is identical with physical block size(PAGE_SIZE). But if it is
@ -1201,10 +1207,7 @@ static int zram_add(void)
* zeroed.
*/
if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE)
zram->disk->queue->limits.discard_zeroes_data = 1;
else
zram->disk->queue->limits.discard_zeroes_data = 0;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue);
blk_queue_max_write_zeroes_sectors(zram->disk->queue, UINT_MAX);
add_disk(zram->disk);