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From: Mike Christie <michael.christie@oracle.com>
To: hch@infradead.org, martin.petersen@oracle.com,
	james.bottomley@hansenpartnership.com,
	linux-scsi@vger.kernel.org, target-devel@vger.kernel.org
Cc: Mike Christie <michael.christie@oracle.com>,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH v2 5/5] scsi: target: Detect unmap support post configuration
Date: Tue, 28 Jun 2022 15:02:30 -0500	[thread overview]
Message-ID: <20220628200230.15052-6-michael.christie@oracle.com> (raw)
In-Reply-To: <20220628200230.15052-1-michael.christie@oracle.com>

On our backend we can do something similar to LIO where we can enable and
disable unmap support on the fly. In the scsi/block layer we can detect
this by just doing a rescan. However, LIO cannot detect this change
because we only check during the initial configuration. This patch
allows unmap detection to also happen when the user tries to turn it on.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/target/target_core_configfs.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index bbcbbfa72b07..f28d3c6dab98 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -732,6 +732,7 @@ static ssize_t emulate_tpu_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct se_dev_attrib *da = to_attrib(item);
+	struct se_device *dev = da->da_dev;
 	bool flag;
 	int ret;
 
@@ -744,8 +745,11 @@ static ssize_t emulate_tpu_store(struct config_item *item,
 	 * Discard supported is detected iblock_create_virtdevice().
 	 */
 	if (flag && !da->max_unmap_block_desc_count) {
-		pr_err("Generic Block Discard not supported\n");
-		return -ENOSYS;
+		if (!dev->transport->configure_unmap ||
+		    !dev->transport->configure_unmap(dev)) {
+			pr_err("Generic Block Discard not supported\n");
+			return -ENOSYS;
+		}
 	}
 
 	da->emulate_tpu = flag;
@@ -758,6 +762,7 @@ static ssize_t emulate_tpws_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct se_dev_attrib *da = to_attrib(item);
+	struct se_device *dev = da->da_dev;
 	bool flag;
 	int ret;
 
@@ -770,8 +775,11 @@ static ssize_t emulate_tpws_store(struct config_item *item,
 	 * Discard supported is detected iblock_create_virtdevice().
 	 */
 	if (flag && !da->max_unmap_block_desc_count) {
-		pr_err("Generic Block Discard not supported\n");
-		return -ENOSYS;
+		if (!dev->transport->configure_unmap ||
+		    !dev->transport->configure_unmap(dev)) {
+			pr_err("Generic Block Discard not supported\n");
+			return -ENOSYS;
+		}
 	}
 
 	da->emulate_tpws = flag;
@@ -964,6 +972,7 @@ static ssize_t unmap_zeroes_data_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct se_dev_attrib *da = to_attrib(item);
+	struct se_device *dev = da->da_dev;
 	bool flag;
 	int ret;
 
@@ -982,10 +991,12 @@ static ssize_t unmap_zeroes_data_store(struct config_item *item,
 	 * Discard supported is detected iblock_configure_device().
 	 */
 	if (flag && !da->max_unmap_block_desc_count) {
-		pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
-		       " because max_unmap_block_desc_count is zero\n",
-		       da->da_dev);
-		return -ENOSYS;
+		if (!dev->transport->configure_unmap ||
+		    !dev->transport->configure_unmap(dev)) {
+			pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set because max_unmap_block_desc_count is zero\n",
+			       da->da_dev);
+			return -ENOSYS;
+		}
 	}
 	da->unmap_zeroes_data = flag;
 	pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
-- 
2.25.1


  parent reply	other threads:[~2022-06-28 20:13 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-28 20:02 [PATCH v2 0/5] target: UNMAP/WRITE_SAME features/cleanups for 5.20 Mike Christie
2022-06-28 20:02 ` [PATCH v2 1/5] scsi: target: Remove incorrect zero blocks WRITE_SAME check Mike Christie
2022-06-28 20:02 ` [PATCH v2 2/5] scsi: target: Add callout to configure unmap settings Mike Christie
2022-06-28 20:02 ` [PATCH v2 3/5] scsi: target: Add iblock configure_unmap callout Mike Christie
2022-06-28 20:02 ` [PATCH v2 4/5] scsi: target: Add file " Mike Christie
2022-06-28 20:02 ` Mike Christie [this message]
2022-07-07 20:54 ` [PATCH v2 0/5] target: UNMAP/WRITE_SAME features/cleanups for 5.20 Martin K. Petersen
2022-07-14  4:22 ` Martin K. Petersen

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