[PATCH v9 0/2] *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

[PATCH v9 0/2] *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

[Yaniv Gardi]

*** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

Yaniv Gardi (2):
  block: ioctl support for sanitize in eMMC 4.5
  mmc: card: Adding support for sanitize in eMMC 4.5

 block/blk-core.c          |    8 +++++
 block/blk-lib.c           |   51 ++++++++++++++++++++++++++++++
 block/blk-merge.c         |    4 ++
 block/elevator.c          |    6 +++-
 block/ioctl.c             |    9 +++++
 drivers/mmc/card/block.c  |   75 +++++++++++++++++++++++++++++++-------------
 drivers/mmc/card/queue.c  |   10 +++++-
 include/linux/blk_types.h |    7 +++-
 include/linux/blkdev.h    |    6 +++
 include/linux/mmc/host.h  |    1 +
 include/uapi/linux/fs.h   |    1 +
 kernel/trace/blktrace.c   |    2 +
 12 files changed, 154 insertions(+), 26 deletions(-)

-- 
1.7.6
-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum

[PATCH v9 1/2] block: ioctl support for sanitize in eMMC 4.5

[Yaniv Gardi]

Adding a new ioctl to support sanitize operation in eMMC
cards version 4.5.
The sanitize ioctl-support, helps performing this operation
via user application

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
 block/blk-core.c          |    8 +++++++
 block/blk-lib.c           |   51 +++++++++++++++++++++++++++++++++++++++++++++
 block/blk-merge.c         |    4 +++
 block/elevator.c          |    6 ++++-
 block/ioctl.c             |    9 ++++++++
 include/linux/blk_types.h |    7 ++++-
 include/linux/blkdev.h    |    6 +++++
 include/uapi/linux/fs.h   |    1 +
 kernel/trace/blktrace.c   |    2 +
 9 files changed, 91 insertions(+), 3 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index c973249..275922f 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1740,6 +1740,14 @@ generic_make_request_checks(struct bio *bio)
 		goto end_io;
 	}
 
+	if ((bio->bi_rw & REQ_SANITIZE) &&
+	    (!blk_queue_sanitize(q))) {
+		pr_info("%s - Queue doesn't support sanitize requests",
+			__func__);
+		err = -EOPNOTSUPP;
+		goto end_io;
+	}
+
 	if (bio->bi_rw & REQ_WRITE_SAME && !bdev_write_same(bio->bi_bdev)) {
 		err = -EOPNOTSUPP;
 		goto end_io;
diff --git a/block/blk-lib.c b/block/blk-lib.c
index b3a1f2b7..f355878 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -136,6 +136,57 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 EXPORT_SYMBOL(blkdev_issue_discard);
 
 /**
+ * blkdev_issue_sanitize - queue a sanitize request
+ * @bdev:	blockdev to issue sanitize for
+ * @gfp_mask:	memory allocation flags (for bio_alloc)
+ *
+ * Description:
+ *    Issue a sanitize request for the specified block device
+ */
+int blkdev_issue_sanitize(struct block_device *bdev, gfp_t gfp_mask)
+{
+	DECLARE_COMPLETION_ONSTACK(wait);
+	struct request_queue *q = bdev_get_queue(bdev);
+	int type = REQ_WRITE | REQ_SANITIZE;
+	struct bio_batch bb;
+	struct bio *bio;
+	int ret = 0;
+
+	if (!q)
+		return -ENXIO;
+
+	if (!blk_queue_sanitize(q)) {
+		pr_err("%s - card doesn't support sanitize", __func__);
+		return -EOPNOTSUPP;
+	}
+
+	bio = bio_alloc(gfp_mask, 1);
+	if (!bio)
+		return -ENOMEM;
+
+	atomic_set(&bb.done, 1);
+	bb.flags = 1 << BIO_UPTODATE;
+	bb.wait = &wait;
+
+	bio->bi_end_io = bio_batch_end_io;
+	bio->bi_bdev = bdev;
+	bio->bi_private = &bb;
+
+	atomic_inc(&bb.done);
+	submit_bio(type, bio);
+
+	/* Wait for bios in-flight */
+	if (!atomic_dec_and_test(&bb.done))
+		wait_for_completion(&wait);
+
+	if (!test_bit(BIO_UPTODATE, &bb.flags))
+		ret = -EIO;
+
+	return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_sanitize);
+
+/**
  * blkdev_issue_write_same - queue a write same operation
  * @bdev:	target blockdev
  * @sector:	start sector
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 936a110..fe87097 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -507,6 +507,10 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
 	if (!rq_mergeable(rq) || !bio_mergeable(bio))
 		return false;
 
+	/* don't merge file system requests and sanitize requests */
+	if ((bio->bi_rw & REQ_SANITIZE) != (rq->bio->bi_rw & REQ_SANITIZE))
+		return false;
+
 	if (!blk_check_merge_flags(rq->cmd_flags, bio->bi_rw))
 		return false;
 
diff --git a/block/elevator.c b/block/elevator.c
index 9edba1b..a0eafb3 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -364,6 +364,9 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
 		if ((rq->cmd_flags & REQ_DISCARD) !=
 		    (pos->cmd_flags & REQ_DISCARD))
 			break;
+		if ((rq->cmd_flags & REQ_SANITIZE) !=
+		    (pos->cmd_flags & REQ_SANITIZE))
+			break;
 		if (rq_data_dir(rq) != rq_data_dir(pos))
 			break;
 		if (pos->cmd_flags & stop_flags)
@@ -570,7 +573,8 @@ void __elv_add_request(struct request_queue *q, struct request *rq, int where)
 
 	if (rq->cmd_flags & REQ_SOFTBARRIER) {
 		/* barriers are scheduling boundary, update end_sector */
-		if (rq->cmd_type == REQ_TYPE_FS) {
+		if ((rq->cmd_type == REQ_TYPE_FS) ||
+		    (rq->cmd_flags & REQ_SANITIZE)) {
 			q->end_sector = rq_end_sector(rq);
 			q->boundary_rq = rq;
 		}
diff --git a/block/ioctl.c b/block/ioctl.c
index a31d91d..0dcadf9 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -185,6 +185,11 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
 	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
 }
 
+static int blk_ioctl_sanitize(struct block_device *bdev)
+{
+	return blkdev_issue_sanitize(bdev, GFP_KERNEL);
+}
+
 static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
 			     uint64_t len)
 {
@@ -303,6 +308,10 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 		set_device_ro(bdev, n);
 		return 0;
 
+	case BLKSANITIZE:
+		ret = blk_ioctl_sanitize(bdev);
+		break;
+
 	case BLKDISCARD:
 	case BLKSECDISCARD: {
 		uint64_t range[2];
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index cdf1119..815562c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -175,6 +175,7 @@ enum rq_flag_bits {
 	__REQ_IO_STAT,		/* account I/O stat */
 	__REQ_MIXED_MERGE,	/* merge of different types, fail separately */
 	__REQ_KERNEL, 		/* direct IO to kernel pages */
+	__REQ_SANITIZE,		/* sanitize */
 	__REQ_NR_BITS,		/* stops here */
 };
 
@@ -187,6 +188,7 @@ enum rq_flag_bits {
 #define REQ_PRIO		(1 << __REQ_PRIO)
 #define REQ_DISCARD		(1 << __REQ_DISCARD)
 #define REQ_WRITE_SAME		(1 << __REQ_WRITE_SAME)
+#define REQ_SANITIZE		(1 << __REQ_SANITIZE)
 #define REQ_NOIDLE		(1 << __REQ_NOIDLE)
 
 #define REQ_FAILFAST_MASK \
@@ -194,12 +196,13 @@ enum rq_flag_bits {
 #define REQ_COMMON_MASK \
 	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
 	 REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
-	 REQ_SECURE)
+	 REQ_SECURE | REQ_SANITIZE)
 #define REQ_CLONE_MASK		REQ_COMMON_MASK
 
 /* This mask is used for both bio and request merge checking */
 #define REQ_NOMERGE_FLAGS \
-	(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)
+	(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | \
+	 REQ_SANITIZE)
 
 #define REQ_RAHEAD		(1 << __REQ_RAHEAD)
 #define REQ_THROTTLED		(1 << __REQ_THROTTLED)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f94bc83..6992cf4 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -459,6 +459,7 @@ struct request_queue {
 #define QUEUE_FLAG_SECDISCARD  17	/* supports SECDISCARD */
 #define QUEUE_FLAG_SAME_FORCE  18	/* force complete on same CPU */
 #define QUEUE_FLAG_DEAD        19	/* queue tear-down finished */
+#define QUEUE_FLAG_SANITIZE    20	/* supports SANITIZE */
 
 #define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
 				 (1 << QUEUE_FLAG_STACKABLE)	|	\
@@ -540,6 +541,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 #define blk_queue_stackable(q)	\
 	test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
 #define blk_queue_discard(q)	test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
+#define blk_queue_sanitize(q)	test_bit(QUEUE_FLAG_SANITIZE, &(q)->queue_flags)
 #define blk_queue_secdiscard(q)	(blk_queue_discard(q) && \
 	test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
 
@@ -620,6 +622,9 @@ static inline bool blk_check_merge_flags(unsigned int flags1,
 	if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD))
 		return false;
 
+	if ((flags1 & REQ_SANITIZE) != (flags2 & REQ_SANITIZE))
+		return false;
+
 	if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE))
 		return false;
 
@@ -1041,6 +1046,7 @@ static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 		sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
+extern int blkdev_issue_sanitize(struct block_device *bdev, gfp_t gfp_mask);
 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
 		sector_t nr_sects, gfp_t gfp_mask, struct page *page);
 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 780d4c6..de543ea 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -144,6 +144,7 @@ struct inodes_stat_t {
 #define BLKSECDISCARD _IO(0x12,125)
 #define BLKROTATIONAL _IO(0x12,126)
 #define BLKZEROOUT _IO(0x12,127)
+#define BLKSANITIZE _IO(0x12, 128)
 
 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
 #define FIBMAP	   _IO(0x00,1)	/* bmap access */
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index c0bd030..06f7940 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1788,6 +1788,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
 		rwbs[i++] = 'W';
 	else if (rw & REQ_DISCARD)
 		rwbs[i++] = 'D';
+	else if (rw & REQ_SANITIZE)
+		rwbs[i++] = 'Z';
 	else if (bytes)
 		rwbs[i++] = 'R';
 	else
-- 
1.7.6
-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum

[PATCH v9 2/2] mmc: card: Adding support for sanitize in eMMC 4.5

[Yaniv Gardi]

This feature deletes the unmap memory region of the eMMC card,
by writing to a specific register in the EXT_CSD.
unmap region is the memory region that was previously deleted
(by erase, trim or discard operation).
In order to avoid timeout when sanitizing large-scale cards,
the timeout for sanitize operation is 240 seconds.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
 drivers/mmc/card/block.c |   75 ++++++++++++++++++++++++++++++++-------------
 drivers/mmc/card/queue.c |   10 +++++-
 include/linux/mmc/host.h |    1 +
 3 files changed, 63 insertions(+), 23 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 21056b9..f532489 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -58,6 +58,7 @@ MODULE_ALIAS("mmc:block");
 #define INAND_CMD38_ARG_SECTRIM1 0x81
 #define INAND_CMD38_ARG_SECTRIM2 0x88
 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
+#define MMC_SANITIZE_REQ_TIMEOUT 240000
 
 static DEFINE_MUTEX(block_mutex);
 
@@ -925,10 +926,10 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 {
 	struct mmc_blk_data *md = mq->data;
 	struct mmc_card *card = md->queue.card;
-	unsigned int from, nr, arg, trim_arg, erase_arg;
+	unsigned int from, nr, arg;
 	int err = 0, type = MMC_BLK_SECDISCARD;
 
-	if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
+	if (!(mmc_can_secure_erase_trim(card))) {
 		err = -EOPNOTSUPP;
 		goto out;
 	}
@@ -936,23 +937,11 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 	from = blk_rq_pos(req);
 	nr = blk_rq_sectors(req);
 
-	/* The sanitize operation is supported at v4.5 only */
-	if (mmc_can_sanitize(card)) {
-		erase_arg = MMC_ERASE_ARG;
-		trim_arg = MMC_TRIM_ARG;
-	} else {
-		erase_arg = MMC_SECURE_ERASE_ARG;
-		trim_arg = MMC_SECURE_TRIM1_ARG;
-	}
+	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
+		arg = MMC_SECURE_TRIM1_ARG;
+	else
+		arg = MMC_SECURE_ERASE_ARG;
 
-	if (mmc_erase_group_aligned(card, from, nr))
-		arg = erase_arg;
-	else if (mmc_can_trim(card))
-		arg = trim_arg;
-	else {
-		err = -EINVAL;
-		goto out;
-	}
 retry:
 	if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
@@ -988,9 +977,6 @@ retry:
 			goto out;
 	}
 
-	if (mmc_can_sanitize(card))
-		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-				 EXT_CSD_SANITIZE_START, 1, 0);
 out_retry:
 	if (err && !mmc_blk_reset(md, card->host, type))
 		goto retry;
@@ -1002,6 +988,46 @@ out:
 	return err ? 0 : 1;
 }
 
+static int mmc_blk_issue_sanitize_rq(struct mmc_queue *mq,
+				      struct request *req)
+{
+	struct mmc_blk_data *md = mq->data;
+	struct mmc_card *card = md->queue.card;
+	int err = 0;
+
+	BUG_ON(!card);
+	BUG_ON(!card->host);
+
+	if (!(mmc_can_sanitize(card) &&
+	     (card->host->caps2 & MMC_CAP2_SANITIZE))) {
+			pr_warn("%s: %s - SANITIZE is not supported\n",
+				mmc_hostname(card->host), __func__);
+			err = -EOPNOTSUPP;
+			goto out;
+	}
+
+	pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
+		mmc_hostname(card->host), __func__);
+
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			 EXT_CSD_SANITIZE_START, 1, MMC_SANITIZE_REQ_TIMEOUT);
+
+	if (err)
+		pr_err("%s: %s - mmc_switch() with SANITIZE failed. err=%d\n",
+		       mmc_hostname(card->host), __func__, err);
+
+	pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
+					     __func__);
+
+out:
+	spin_lock_irq(&md->lock);
+	__blk_end_request(req, err, blk_rq_bytes(req));
+	spin_unlock_irq(&md->lock);
+
+	return err ? 0 : 1;
+}
+
+
 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
 {
 	struct mmc_blk_data *md = mq->data;
@@ -1486,7 +1512,12 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		goto out;
 	}
 
-	if (req && req->cmd_flags & REQ_DISCARD) {
+	if (req && req->cmd_flags & REQ_SANITIZE) {
+		/* complete ongoing async transfer before issuing sanitize */
+		if (card->host && card->host->areq)
+			mmc_blk_issue_rw_rq(mq, NULL);
+		ret = mmc_blk_issue_sanitize_rq(mq, req);
+	} else if (req && req->cmd_flags & REQ_DISCARD) {
 		/* complete ongoing async transfer before issuing discard */
 		if (card->host->areq)
 			mmc_blk_issue_rw_rq(mq, NULL);
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index fadf52e..32c5bf1 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -148,10 +148,15 @@ static void mmc_queue_setup_discard(struct request_queue *q,
 	/* granularity must not be greater than max. discard */
 	if (card->pref_erase > max_discard)
 		q->limits.discard_granularity = 0;
-	if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
+	if (mmc_can_secure_erase_trim(card))
 		queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
 }
 
+static void mmc_queue_setup_sanitize(struct request_queue *q)
+{
+	queue_flag_set_unlocked(QUEUE_FLAG_SANITIZE, q);
+}
+
 /**
  * mmc_init_queue - initialise a queue structure.
  * @mq: mmc queue
@@ -187,6 +192,9 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 	if (mmc_can_erase(card))
 		mmc_queue_setup_discard(mq->queue, card);
 
+	if ((mmc_can_sanitize(card) && (host->caps2 & MMC_CAP2_SANITIZE)))
+		mmc_queue_setup_sanitize(mq->queue);
+
 #ifdef CONFIG_MMC_BLOCK_BOUNCE
 	if (host->max_segs == 1) {
 		unsigned int bouncesz;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 61a10c1..045e9f7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -258,6 +258,7 @@ struct mmc_host {
 #define MMC_CAP2_HC_ERASE_SZ	(1 << 9)	/* High-capacity erase size */
 #define MMC_CAP2_CD_ACTIVE_HIGH	(1 << 10)	/* Card-detect signal active high */
 #define MMC_CAP2_RO_ACTIVE_HIGH	(1 << 11)	/* Write-protect signal active high */
+#define MMC_CAP2_SANITIZE	(1 << 12)		/* Support Sanitize */
 
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
-- 
1.7.6
-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum

Re: [PATCH v9 0/2] *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

[Tejun Heo]

On Tue, Feb 19, 2013 at 06:10:50PM +0200, Yaniv Gardi wrote:
> *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

If this is something eMMC specific and not expected to have in-kernel
consumer, unlike DISCARD which filesystems use, why not just use
SG_IO?

Thanks.

-- 
tejun

[PATCH v9 0/2] *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

[Yaniv Gardi]

*** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

Yaniv Gardi (2):
  block: ioctl support for sanitize in eMMC 4.5
  mmc: card: Adding support for sanitize in eMMC 4.5

 block/blk-core.c          |    8 +++++
 block/blk-lib.c           |   51 ++++++++++++++++++++++++++++++
 block/blk-merge.c         |    4 ++
 block/elevator.c          |    6 +++-
 block/ioctl.c             |    9 +++++
 drivers/mmc/card/block.c  |   75 +++++++++++++++++++++++++++++++-------------
 drivers/mmc/card/queue.c  |   10 +++++-
 include/linux/blk_types.h |    7 +++-
 include/linux/blkdev.h    |    6 +++
 include/linux/mmc/host.h  |    1 +
 include/uapi/linux/fs.h   |    1 +
 kernel/trace/blktrace.c   |    2 +
 12 files changed, 154 insertions(+), 26 deletions(-)

-- 
1.7.6
-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum

Re: [PATCH v9 0/2] *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

[Tejun Heo]

(resending as requested)

On Tue, Feb 19, 2013 at 06:22:15PM +0200, Yaniv Gardi wrote:
> *** adding and exposing SANITIZE capability to the user space via a unique IOCTL ***

If this is something eMMC specific and not expected to have in-kernel
consumer, unlike DISCARD which filesystems use, why not just use
SG_IO?

Thanks.

-- 
tejun