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From: Satya Tangirala <satyat@google.com>
To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Eric Biggers <ebiggers@google.com>,
	Satya Tangirala <satyat@google.com>
Subject: [PATCH v3 01/10] block: introduce blk_ksm_is_empty()
Date: Fri,  4 Jun 2021 19:58:51 +0000	[thread overview]
Message-ID: <20210604195900.2096121-2-satyat@google.com> (raw)
In-Reply-To: <20210604195900.2096121-1-satyat@google.com>

This function checks if a given keyslot manager supports any encryption
mode/data unit size combination (and returns true if there is no such
supported combination). Helps clean up code a little.

Signed-off-by: Satya Tangirala <satyat@google.com>
---
 block/keyslot-manager.c         | 21 +++++++++++++++++++++
 drivers/md/dm-table.c           | 11 +----------
 include/linux/keyslot-manager.h |  2 ++
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/block/keyslot-manager.c b/block/keyslot-manager.c
index 2c4a55bea6ca..88211581141a 100644
--- a/block/keyslot-manager.c
+++ b/block/keyslot-manager.c
@@ -437,6 +437,27 @@ void blk_ksm_destroy(struct blk_keyslot_manager *ksm)
 }
 EXPORT_SYMBOL_GPL(blk_ksm_destroy);
 
+/**
+ * blk_ksm_is_empty() - Checks if the keyslot manager has any crypto
+ *			capabilities at all.
+ * @ksm: The input keyslot manager to check
+ *
+ * Return: true if @ksm doesn't have any crypto capabilities at all, and
+ *	   false otherwise.
+ */
+bool blk_ksm_is_empty(struct blk_keyslot_manager *ksm)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ksm->crypto_modes_supported); i++) {
+		if (ksm->crypto_modes_supported[i])
+			return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(blk_ksm_is_empty);
+
 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q)
 {
 	if (blk_integrity_queue_supports_integrity(q)) {
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index ee47a332b462..29cbfc3e3c4b 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1295,7 +1295,6 @@ static int dm_table_construct_keyslot_manager(struct dm_table *t)
 	struct blk_keyslot_manager *ksm;
 	struct dm_target *ti;
 	unsigned int i;
-	bool ksm_is_empty = true;
 
 	dksm = kmalloc(sizeof(*dksm), GFP_KERNEL);
 	if (!dksm)
@@ -1332,15 +1331,7 @@ static int dm_table_construct_keyslot_manager(struct dm_table *t)
 	 * If the new KSM doesn't actually support any crypto modes, we may as
 	 * well represent it with a NULL ksm.
 	 */
-	ksm_is_empty = true;
-	for (i = 0; i < ARRAY_SIZE(ksm->crypto_modes_supported); i++) {
-		if (ksm->crypto_modes_supported[i]) {
-			ksm_is_empty = false;
-			break;
-		}
-	}
-
-	if (ksm_is_empty) {
+	if (blk_ksm_is_empty(ksm)) {
 		dm_destroy_keyslot_manager(ksm);
 		ksm = NULL;
 	}
diff --git a/include/linux/keyslot-manager.h b/include/linux/keyslot-manager.h
index a27605e2f826..0f09b4f310f7 100644
--- a/include/linux/keyslot-manager.h
+++ b/include/linux/keyslot-manager.h
@@ -106,6 +106,8 @@ void blk_ksm_reprogram_all_keys(struct blk_keyslot_manager *ksm);
 
 void blk_ksm_destroy(struct blk_keyslot_manager *ksm);
 
+bool blk_ksm_is_empty(struct blk_keyslot_manager *ksm);
+
 void blk_ksm_intersect_modes(struct blk_keyslot_manager *parent,
 			     const struct blk_keyslot_manager *child);
 
-- 
2.32.0.rc1.229.g3e70b5a671-goog


  reply	other threads:[~2021-06-04 20:00 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 19:58 [PATCH v3 00/10] ensure bios aren't split in middle of crypto data unit Satya Tangirala
2021-06-04 19:58 ` Satya Tangirala [this message]
2021-06-16 23:47   ` [PATCH v3 01/10] block: introduce blk_ksm_is_empty() Eric Biggers
2021-06-04 19:58 ` [PATCH v3 02/10] block: blk-crypto: introduce blk_crypto_bio_sectors_alignment() Satya Tangirala
2021-06-17  0:29   ` Eric Biggers
2021-06-04 19:58 ` [PATCH v3 03/10] block: introduce bio_required_sector_alignment() Satya Tangirala
2021-06-17  0:37   ` Eric Biggers
2021-06-04 19:58 ` [PATCH v3 04/10] block: respect bio_required_sector_alignment() in blk-crypto-fallback Satya Tangirala
2021-06-17  0:39   ` Eric Biggers
2021-06-17  4:34     ` Eric Biggers
2021-06-04 19:58 ` [PATCH v3 05/10] block: keyslot-manager: introduce blk_ksm_restrict_dus_to_queue_limits() Satya Tangirala
2021-06-17  1:58   ` Eric Biggers
2021-06-04 19:58 ` [PATCH v3 06/10] ufshcd: handle error from blk_ksm_register() Satya Tangirala
2021-06-04 19:58 ` [PATCH v3 07/10] mmc: " Satya Tangirala
2021-06-17  3:25   ` Eric Biggers
2021-06-24 10:04     ` Satya Tangirala
2021-06-04 19:58 ` [PATCH v3 08/10] dm: " Satya Tangirala
2021-06-17  3:23   ` Eric Biggers
2021-06-04 19:58 ` [PATCH v3 09/10] blk-merge: Ensure bios aren't split in middle of a crypto data unit Satya Tangirala
2021-06-04 19:59 ` [PATCH v3 10/10] block: add WARN_ON_ONCE() to bio_split() for sector alignment Satya Tangirala
2021-06-17  2:46   ` Eric Biggers
2021-06-17  3:51 ` [PATCH v3 00/10] ensure bios aren't split in middle of crypto data unit Eric Biggers

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