brd: remove discard support

It's just a in-driver reimplementation of writing zeroes to the pages,
which fails if the discards aren't page aligned.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 0 insertions, 54 deletions

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 3adc32a3153b..4ec84d504780 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -134,28 +134,6 @@ static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)
         return page;
 }
 
-static void brd_free_page(struct brd_device *brd, sector_t sector)
-{
-        struct page *page;
-        pgoff_t idx;
-
-        spin_lock(&brd->brd_lock);
-        idx = sector >> PAGE_SECTORS_SHIFT;
-        page = radix_tree_delete(&brd->brd_pages, idx);
-        spin_unlock(&brd->brd_lock);
-        if (page)
-                __free_page(page);
-}
-
-static void brd_zero_page(struct brd_device *brd, sector_t sector)
-{
-        struct page *page;
-
-        page = brd_lookup_page(brd, sector);
-        if (page)
-                clear_highpage(page);
-}
-
 /*
  * Free all backing store pages and radix tree. This must only be called when
  * there are no other users of the device.
@@ -212,24 +190,6 @@ static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n)
         return 0;
 }
 
-static void discard_from_brd(struct brd_device *brd,
-                        sector_t sector, size_t n)
-{
-        while (n >= PAGE_SIZE) {
-                /*
-                 * Don't want to actually discard pages here because
-                 * re-allocating the pages can result in writeback
-                 * deadlocks under heavy load.
-                 */
-                if (0)
-                        brd_free_page(brd, sector);
-                else
-                        brd_zero_page(brd, sector);
-                sector += PAGE_SIZE >> SECTOR_SHIFT;
-                n -= PAGE_SIZE;
-        }
-}
-
 /*
  * Copy n bytes from src to the brd starting at sector. Does not sleep.
  */
@@ -338,14 +298,6 @@ static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
         if (bio_end_sector(bio) > get_capacity(bdev->bd_disk))
                 goto io_error;
 
-        if (unlikely(bio_op(bio) == REQ_OP_DISCARD)) {
-                if (sector & ((PAGE_SIZE >> SECTOR_SHIFT) - 1) ||
-                    bio->bi_iter.bi_size & ~PAGE_MASK)
-                        goto io_error;
-                discard_from_brd(brd, sector, bio->bi_iter.bi_size);
-                goto out;
-        }
-
         bio_for_each_segment(bvec, bio, iter) {
                 unsigned int len = bvec.bv_len;
                 int err;
@@ -357,7 +309,6 @@ static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
                 sector += len >> SECTOR_SHIFT;
         }
 
-out:
         bio_endio(bio);
         return BLK_QC_T_NONE;
 io_error:
@@ -464,11 +415,6 @@ static struct brd_device *brd_alloc(int i)
          *  is harmless)
          */
         blk_queue_physical_block_size(brd->brd_queue, PAGE_SIZE);
-
-        brd->brd_queue->limits.discard_granularity = PAGE_SIZE;
-        blk_queue_max_discard_sectors(brd->brd_queue, UINT_MAX);
-        brd->brd_queue->limits.discard_zeroes_data = 1;
-        queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, brd->brd_queue);
 #ifdef CONFIG_BLK_DEV_RAM_DAX
         queue_flag_set_unlocked(QUEUE_FLAG_DAX, brd->brd_queue);
 #endif