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target/sbc: Add LBPRZ attribute + control CDB emulation

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This change sets the LBPRZ flag in EVPD page b2h and READ CAPACITY (16)
based on a new unmap_zeroes_data device attribute. This flag is set
automatically for iblock based on underlying block device queue's
discard_zeroes_data flag.

Signed-off-by: Jamie Pocas <jamie.pocas@emc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Jamie Pocas
2015-11-29 14:44:57 -08:00
committed by Nicholas Bellinger
parent ef8f46b549
commit e6f41633cb
6 changed files with 64 additions and 1 deletions
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drivers/target/target_core_configfs.c
+36
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@@ -499,6 +499,7 @@ DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
#define DEF_CONFIGFS_ATTRIB_STORE_U32(_name) \
@@ -866,6 +867,39 @@ static ssize_t emulate_rest_reord_store(struct config_item *item,
return count;
}
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);
bool flag;
int ret;
ret = strtobool(page, &flag);
if (ret < 0)
return ret;
if (da->da_dev->export_count) {
pr_err("dev[%p]: Unable to change SE Device"
" unmap_zeroes_data while export_count is %d\n",
da->da_dev, da->da_dev->export_count);
return -EINVAL;
}
/*
* We expect this value to be non-zero when generic Block Layer
* 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;
}
da->unmap_zeroes_data = flag;
pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
da->da_dev, flag);
return 0;
}
/*
* Note, this can only be called on unexported SE Device Object.
*/
@@ -998,6 +1032,7 @@ CONFIGFS_ATTR(, max_unmap_lba_count);
CONFIGFS_ATTR(, max_unmap_block_desc_count);
CONFIGFS_ATTR(, unmap_granularity);
CONFIGFS_ATTR(, unmap_granularity_alignment);
CONFIGFS_ATTR(, unmap_zeroes_data);
CONFIGFS_ATTR(, max_write_same_len);
/*
@@ -1034,6 +1069,7 @@ struct configfs_attribute *sbc_attrib_attrs[] = {
&attr_max_unmap_block_desc_count,
&attr_unmap_granularity,
&attr_unmap_granularity_alignment,
&attr_unmap_zeroes_data,
&attr_max_write_same_len,
NULL,
};