[PATCH 16/27] zram: implement REQ_OP_WRITE_ZEROES

[Christoph Hellwig]

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

Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Hannes Reinecke <h...@suse.com>
---
 drivers/block/zram/zram_drv.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index dceb5edd1e54..1710b06f04a7 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -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);
 
-- 
2.11.0