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scsi: target: Detect UNMAP support post configuration

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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.

Link: https://lore.kernel.org/r/20220628200230.15052-6-michael.christie@oracle.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2022-06-28 15:02:30 -05:00 committed by Martin K. Petersen
parent 33efaaf6e2
commit 34bd1dcacf
1 changed files with 19 additions and 8 deletions
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27
drivers/target/target_core_configfs.c
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@ -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",