block: add a separate operation type for secure erase

Instead of overloading the discard support with the REQ_SECURE flag.
Use the opportunity to rename the queue flag as well, and remove the
dead checks for this flag in the RAID 1 and RAID 10 drivers that don't
claim support for secure erase.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

3 files changed, 33 insertions, 25 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 32a283eb7274..db31a2981223 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1977,16 +1977,21 @@ generic_make_request_checks(struct bio *bio)
                 }
         }
 
-        if ((bio_op(bio) == REQ_OP_DISCARD) &&
-            (!blk_queue_discard(q) ||
-             ((bio->bi_rw & REQ_SECURE) && !blk_queue_secdiscard(q)))) {
-                err = -EOPNOTSUPP;
-                goto end_io;
-        }
-
-        if (bio_op(bio) == REQ_OP_WRITE_SAME && !bdev_write_same(bio->bi_bdev)) {
-                err = -EOPNOTSUPP;
-                goto end_io;
+        switch (bio_op(bio)) {
+        case REQ_OP_DISCARD:
+                if (!blk_queue_discard(q))
+                        goto not_supported;
+                break;
+        case REQ_OP_SECURE_ERASE:
+                if (!blk_queue_secure_erase(q))
+                        goto not_supported;
+                break;
+        case REQ_OP_WRITE_SAME:
+                if (!bdev_write_same(bio->bi_bdev))
+                        goto not_supported;
+                break;
+        default:
+                break;
         }
 
         /*
@@ -2003,6 +2008,8 @@ generic_make_request_checks(struct bio *bio)
         trace_block_bio_queue(q, bio);
         return true;
 
+not_supported:
+        err = -EOPNOTSUPP;
 end_io:
         bio->bi_error = err;
         bio_endio(bio);
diff --git a/block/blk-lib.c b/block/blk-lib.c
index ff2a7f04af4d..78626c2fde33 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -23,20 +23,27 @@ static struct bio *next_bio(struct bio *bio, unsigned int nr_pages,
 }
 
 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
-                sector_t nr_sects, gfp_t gfp_mask, int op_flags,
+                sector_t nr_sects, gfp_t gfp_mask, int flags,
                 struct bio **biop)
 {
         struct request_queue *q = bdev_get_queue(bdev);
         struct bio *bio = *biop;
         unsigned int granularity;
+        enum req_op op;
         int alignment;
 
         if (!q)
                 return -ENXIO;
-        if (!blk_queue_discard(q))
-                return -EOPNOTSUPP;
-        if ((op_flags & REQ_SECURE) && !blk_queue_secdiscard(q))
-                return -EOPNOTSUPP;
+
+        if (flags & BLKDEV_DISCARD_SECURE) {
+                if (!blk_queue_secure_erase(q))
+                        return -EOPNOTSUPP;
+                op = REQ_OP_SECURE_ERASE;
+        } else {
+                if (!blk_queue_discard(q))
+                        return -EOPNOTSUPP;
+                op = REQ_OP_DISCARD;
+        }
 
         /* Zero-sector (unknown) and one-sector granularities are the same.  */
         granularity = max(q->limits.discard_granularity >> 9, 1U);
@@ -66,7 +73,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
                 bio = next_bio(bio, 1, gfp_mask);
                 bio->bi_iter.bi_sector = sector;
                 bio->bi_bdev = bdev;
-                bio_set_op_attrs(bio, REQ_OP_DISCARD, op_flags);
+                bio_set_op_attrs(bio, op, 0);
 
                 bio->bi_iter.bi_size = req_sects << 9;
                 nr_sects -= req_sects;
@@ -100,16 +107,12 @@ EXPORT_SYMBOL(__blkdev_issue_discard);
 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
                 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
 {
-        int op_flags = 0;
         struct bio *bio = NULL;
         struct blk_plug plug;
         int ret;
 
-        if (flags & BLKDEV_DISCARD_SECURE)
-                op_flags |= REQ_SECURE;
-
         blk_start_plug(&plug);
-        ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, op_flags,
+        ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags,
                         &bio);
         if (!ret && bio) {
                 ret = submit_bio_wait(bio);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index c265348b75d1..9772308a8391 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -649,8 +649,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
         if (!rq_mergeable(req) || !rq_mergeable(next))
                 return 0;
 
-        if (!blk_check_merge_flags(req->cmd_flags, req_op(req), next->cmd_flags,
-                                   req_op(next)))
+        if (req_op(req) != req_op(next))
                 return 0;
 
         /*
@@ -752,8 +751,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
         if (!rq_mergeable(rq) || !bio_mergeable(bio))
                 return false;
 
-        if (!blk_check_merge_flags(rq->cmd_flags, req_op(rq), bio->bi_rw,
-                                   bio_op(bio)))
+        if (req_op(rq) != bio_op(bio))
                 return false;
 
         /* different data direction or already started, don't merge */