+++ /dev/null
-From af097f5d199e2aa3ab3ef777f0716e487b8f7b08 Mon Sep 17 00:00:00 2001
-From: Jens Axboe <axboe@kernel.dk>
-Date: Tue, 8 May 2018 15:09:41 -0600
-Subject: block: break discard submissions into the user defined size
-
-From: Jens Axboe <axboe@kernel.dk>
-
-commit af097f5d199e2aa3ab3ef777f0716e487b8f7b08 upstream.
-
-Don't build discards bigger than what the user asked for, if the
-user decided to limit the size by writing to 'discard_max_bytes'.
-
-Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
-Reviewed-by: Omar Sandoval <osandov@fb.com>
-Signed-off-by: Jens Axboe <axboe@kernel.dk>
-Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- block/blk-lib.c | 10 ++++++++--
- 1 file changed, 8 insertions(+), 2 deletions(-)
-
---- a/block/blk-lib.c
-+++ b/block/blk-lib.c
-@@ -81,8 +81,14 @@ int blkdev_issue_discard(struct block_de
- break;
- }
-
-- /* Make sure bi_size doesn't overflow */
-- req_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9);
-+ /*
-+ * Issue in chunks of the user defined max discard setting,
-+ * ensuring that bi_size doesn't overflow
-+ */
-+ req_sects = min_t(sector_t, nr_sects,
-+ q->limits.max_discard_sectors);
-+ if (req_sects > UINT_MAX >> 9)
-+ req_sects = UINT_MAX >> 9;
-
- /*
- * If splitting a request, and the next starting sector would be
+++ /dev/null
-From 744889b7cbb56a64f957e65ade7cb65fe3f35714 Mon Sep 17 00:00:00 2001
-From: Ming Lei <ming.lei@redhat.com>
-Date: Fri, 12 Oct 2018 15:53:10 +0800
-Subject: block: don't deal with discard limit in blkdev_issue_discard()
-
-From: Ming Lei <ming.lei@redhat.com>
-
-commit 744889b7cbb56a64f957e65ade7cb65fe3f35714 upstream.
-
-blk_queue_split() does respect this limit via bio splitting, so no
-need to do that in blkdev_issue_discard(), then we can align to
-normal bio submit(bio_add_page() & submit_bio()).
-
-More importantly, this patch fixes one issue introduced in a22c4d7e34402cc
-("block: re-add discard_granularity and alignment checks"), in which
-zero discard bio may be generated in case of zero alignment.
-
-Fixes: a22c4d7e34402ccdf3 ("block: re-add discard_granularity and alignment checks")
-Cc: stable@vger.kernel.org
-Cc: Ming Lin <ming.l@ssi.samsung.com>
-Cc: Mike Snitzer <snitzer@redhat.com>
-Cc: Christoph Hellwig <hch@lst.de>
-Cc: Xiao Ni <xni@redhat.com>
-Tested-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
-Signed-off-by: Ming Lei <ming.lei@redhat.com>
-Signed-off-by: Jens Axboe <axboe@kernel.dk>
-Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- block/blk-lib.c | 28 ++--------------------------
- 1 file changed, 2 insertions(+), 26 deletions(-)
-
---- a/block/blk-lib.c
-+++ b/block/blk-lib.c
-@@ -43,8 +43,6 @@ int blkdev_issue_discard(struct block_de
- DECLARE_COMPLETION_ONSTACK(wait);
- struct request_queue *q = bdev_get_queue(bdev);
- int type = REQ_WRITE | REQ_DISCARD;
-- unsigned int granularity;
-- int alignment;
- struct bio_batch bb;
- struct bio *bio;
- int ret = 0;
-@@ -56,10 +54,6 @@ int blkdev_issue_discard(struct block_de
- if (!blk_queue_discard(q))
- return -EOPNOTSUPP;
-
-- /* Zero-sector (unknown) and one-sector granularities are the same. */
-- granularity = max(q->limits.discard_granularity >> 9, 1U);
-- alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
--
- if (flags & BLKDEV_DISCARD_SECURE) {
- if (!blk_queue_secdiscard(q))
- return -EOPNOTSUPP;
-@@ -72,8 +66,8 @@ int blkdev_issue_discard(struct block_de
-
- blk_start_plug(&plug);
- while (nr_sects) {
-- unsigned int req_sects;
-- sector_t end_sect, tmp;
-+ unsigned int req_sects = nr_sects;
-+ sector_t end_sect;
-
- bio = bio_alloc(gfp_mask, 1);
- if (!bio) {
-@@ -81,28 +75,10 @@ int blkdev_issue_discard(struct block_de
- break;
- }
-
-- /*
-- * Issue in chunks of the user defined max discard setting,
-- * ensuring that bi_size doesn't overflow
-- */
-- req_sects = min_t(sector_t, nr_sects,
-- q->limits.max_discard_sectors);
- if (req_sects > UINT_MAX >> 9)
- req_sects = UINT_MAX >> 9;
-
-- /*
-- * If splitting a request, and the next starting sector would be
-- * misaligned, stop the discard at the previous aligned sector.
-- */
- end_sect = sector + req_sects;
-- tmp = end_sect;
-- if (req_sects < nr_sects &&
-- sector_div(tmp, granularity) != alignment) {
-- end_sect = end_sect - alignment;
-- sector_div(end_sect, granularity);
-- end_sect = end_sect * granularity + alignment;
-- req_sects = end_sect - sector;
-- }
-
- bio->bi_iter.bi_sector = sector;
- bio->bi_end_io = bio_batch_end_io;