[PATCH V2] block: Fix secure erase

From: Adrian Hunter
Date: Tue Aug 16 2016 - 04:04:38 EST

Commit 288dab8a35a0 ("block: add a separate operation type for secure
erase") split REQ_OP_SECURE_ERASE from REQ_OP_DISCARD without considering
all the places REQ_OP_DISCARD was being used to mean either. Fix those.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Fixes: 288dab8a35a0 ("block: add a separate operation type for secure erase")
---


Changes in V2:
In elv_dispatch_sort() don't allow requests with different ops to pass
one another.


block/bio.c | 21 +++++++++++----------
block/blk-merge.c | 33 +++++++++++++++++++--------------
block/elevator.c | 2 +-
drivers/mmc/card/block.c | 1 +
drivers/mmc/card/queue.c | 3 ++-
drivers/mmc/card/queue.h | 4 +++-
include/linux/bio.h | 10 ++++++++--
include/linux/blkdev.h | 6 ++++--
kernel/trace/blktrace.c | 2 +-
9 files changed, 50 insertions(+), 32 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index f39477538fef..aa7354088008 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -667,18 +667,19 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;

- if (bio_op(bio) == REQ_OP_DISCARD)
- goto integrity_clone;
-
- if (bio_op(bio) == REQ_OP_WRITE_SAME) {
+ switch (bio_op(bio)) {
+ case REQ_OP_DISCARD:
+ case REQ_OP_SECURE_ERASE:
+ break;
+ case REQ_OP_WRITE_SAME:
bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
- goto integrity_clone;
+ break;
+ default:
+ bio_for_each_segment(bv, bio_src, iter)
+ bio->bi_io_vec[bio->bi_vcnt++] = bv;
+ break;
}

- bio_for_each_segment(bv, bio_src, iter)
- bio->bi_io_vec[bio->bi_vcnt++] = bv;
-
-integrity_clone:
if (bio_integrity(bio_src)) {
int ret;

@@ -1788,7 +1789,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
* Discards need a mutable bio_vec to accommodate the payload
* required by the DSM TRIM and UNMAP commands.
*/
- if (bio_op(bio) == REQ_OP_DISCARD)
+ if (bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_SECURE_ERASE)
split = bio_clone_bioset(bio, gfp, bs);
else
split = bio_clone_fast(bio, gfp, bs);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 3eec75a9e91d..72627e3cf91e 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -172,12 +172,18 @@ void blk_queue_split(struct request_queue *q, struct bio **bio,
struct bio *split, *res;
unsigned nsegs;

- if (bio_op(*bio) == REQ_OP_DISCARD)
+ switch (bio_op(*bio)) {
+ case REQ_OP_DISCARD:
+ case REQ_OP_SECURE_ERASE:
split = blk_bio_discard_split(q, *bio, bs, &nsegs);
- else if (bio_op(*bio) == REQ_OP_WRITE_SAME)
+ break;
+ case REQ_OP_WRITE_SAME:
split = blk_bio_write_same_split(q, *bio, bs, &nsegs);
- else
+ break;
+ default:
split = blk_bio_segment_split(q, *bio, q->bio_split, &nsegs);
+ break;
+ }

/* physical segments can be figured out during splitting */
res = split ? split : *bio;
@@ -213,7 +219,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
* This should probably be returning 0, but blk_add_request_payload()
* (Christoph!!!!)
*/
- if (bio_op(bio) == REQ_OP_DISCARD)
+ if (bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_SECURE_ERASE)
return 1;

if (bio_op(bio) == REQ_OP_WRITE_SAME)
@@ -385,7 +391,9 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
nsegs = 0;
cluster = blk_queue_cluster(q);

- if (bio_op(bio) == REQ_OP_DISCARD) {
+ switch (bio_op(bio)) {
+ case REQ_OP_DISCARD:
+ case REQ_OP_SECURE_ERASE:
/*
* This is a hack - drivers should be neither modifying the
* biovec, nor relying on bi_vcnt - but because of
@@ -393,19 +401,16 @@ static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
* a payload we need to set up here (thank you Christoph) and
* bi_vcnt is really the only way of telling if we need to.
*/
-
- if (bio->bi_vcnt)
- goto single_segment;
-
- return 0;
- }
-
- if (bio_op(bio) == REQ_OP_WRITE_SAME) {
-single_segment:
+ if (!bio->bi_vcnt)
+ return 0;
+ /* Fall through */
+ case REQ_OP_WRITE_SAME:
*sg = sglist;
bvec = bio_iovec(bio);
sg_set_page(*sg, bvec.bv_page, bvec.bv_len, bvec.bv_offset);
return 1;
+ default:
+ break;
}

for_each_bio(bio)
diff --git a/block/elevator.c b/block/elevator.c
index 7096c22041e7..f7d973a56fd7 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -366,7 +366,7 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
list_for_each_prev(entry, &q->queue_head) {
struct request *pos = list_entry_rq(entry);

- if ((req_op(rq) == REQ_OP_DISCARD) != (req_op(pos) == REQ_OP_DISCARD))
+ if (req_op(rq) != req_op(pos))
break;
if (rq_data_dir(rq) != rq_data_dir(pos))
break;
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 48a5dd740f3b..82503e6f04b3 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1726,6 +1726,7 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
break;

if (req_op(next) == REQ_OP_DISCARD ||
+ req_op(next) == REQ_OP_SECURE_ERASE ||
req_op(next) == REQ_OP_FLUSH)
break;

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index bf14642a576a..29578e98603d 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -33,7 +33,8 @@ static int mmc_prep_request(struct request_queue *q, struct request *req)
/*
* We only like normal block requests and discards.
*/
- if (req->cmd_type != REQ_TYPE_FS && req_op(req) != REQ_OP_DISCARD) {
+ if (req->cmd_type != REQ_TYPE_FS && req_op(req) != REQ_OP_DISCARD &&
+ req_op(req) != REQ_OP_SECURE_ERASE) {
blk_dump_rq_flags(req, "MMC bad request");
return BLKPREP_KILL;
}
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index d62531124d54..fee5e1271465 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -4,7 +4,9 @@
static inline bool mmc_req_is_special(struct request *req)
{
return req &&
- (req_op(req) == REQ_OP_FLUSH || req_op(req) == REQ_OP_DISCARD);
+ (req_op(req) == REQ_OP_FLUSH ||
+ req_op(req) == REQ_OP_DISCARD ||
+ req_op(req) == REQ_OP_SECURE_ERASE);
}

struct request;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 59ffaa68b11b..23ddf4b46a9b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -71,7 +71,8 @@ static inline bool bio_has_data(struct bio *bio)
{
if (bio &&
bio->bi_iter.bi_size &&
- bio_op(bio) != REQ_OP_DISCARD)
+ bio_op(bio) != REQ_OP_DISCARD &&
+ bio_op(bio) != REQ_OP_SECURE_ERASE)
return true;

return false;
@@ -79,7 +80,9 @@ static inline bool bio_has_data(struct bio *bio)

static inline bool bio_no_advance_iter(struct bio *bio)
{
- return bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_WRITE_SAME;
+ return bio_op(bio) == REQ_OP_DISCARD ||
+ bio_op(bio) == REQ_OP_SECURE_ERASE ||
+ bio_op(bio) == REQ_OP_WRITE_SAME;
}

static inline bool bio_is_rw(struct bio *bio)
@@ -199,6 +202,9 @@ static inline unsigned bio_segments(struct bio *bio)
if (bio_op(bio) == REQ_OP_DISCARD)
return 1;

+ if (bio_op(bio) == REQ_OP_SECURE_ERASE)
+ return 1;
+
if (bio_op(bio) == REQ_OP_WRITE_SAME)
return 1;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2c210b6a7bcf..e79055c8b577 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -882,7 +882,7 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
int op)
{
- if (unlikely(op == REQ_OP_DISCARD))
+ if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
return min(q->limits.max_discard_sectors, UINT_MAX >> 9);

if (unlikely(op == REQ_OP_WRITE_SAME))
@@ -913,7 +913,9 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
if (unlikely(rq->cmd_type != REQ_TYPE_FS))
return q->limits.max_hw_sectors;

- if (!q->limits.chunk_sectors || (req_op(rq) == REQ_OP_DISCARD))
+ if (!q->limits.chunk_sectors ||
+ req_op(rq) == REQ_OP_DISCARD ||
+ req_op(rq) == REQ_OP_SECURE_ERASE)
return blk_queue_get_max_sectors(q, req_op(rq));

return min(blk_max_size_offset(q, offset),
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 7598e6ca817a..dbafc5df03f3 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -223,7 +223,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
what |= MASK_TC_BIT(op_flags, META);
what |= MASK_TC_BIT(op_flags, PREFLUSH);
what |= MASK_TC_BIT(op_flags, FUA);
- if (op == REQ_OP_DISCARD)
+ if (op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)
what |= BLK_TC_ACT(BLK_TC_DISCARD);
if (op == REQ_OP_FLUSH)
what |= BLK_TC_ACT(BLK_TC_FLUSH);
--
1.9.1