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tcmu: Support emulate_write_cache

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This will enable the toggling of write_cache in tcmu through targetcli-fb

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Reviewed-By: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bryant G. Ly 2017-06-06 09:28:48 -05:00 committed by Nicholas Bellinger
parent e9447a46e9
commit 9a8bb60650
1 changed files with 30 additions and 0 deletions
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30
drivers/target/target_core_user.c
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@ -1290,6 +1290,8 @@ static int tcmu_configure_device(struct se_device *dev)
/* Other attributes can be configured in userspace */
if (!dev->dev_attrib.hw_max_sectors)
dev->dev_attrib.hw_max_sectors = 128;
if (!dev->dev_attrib.emulate_write_cache)
dev->dev_attrib.emulate_write_cache = 0;
dev->dev_attrib.hw_queue_depth = 128;
/*
@ -1546,6 +1548,32 @@ static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *pag
}
CONFIGFS_ATTR(tcmu_, cmd_time_out);
static ssize_t tcmu_emulate_write_cache_show(struct config_item *item,
char *page)
{
struct se_dev_attrib *da = container_of(to_config_group(item),
struct se_dev_attrib, da_group);
return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache);
}
static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
const char *page, size_t count)
{
struct se_dev_attrib *da = container_of(to_config_group(item),
struct se_dev_attrib, da_group);
int val;
int ret;
ret = kstrtouint(page, 0, &val);
if (ret < 0)
return ret;
da->emulate_write_cache = val;
return count;
}
CONFIGFS_ATTR(tcmu_, emulate_write_cache);
static struct configfs_attribute **tcmu_attrs;
static struct target_backend_ops tcmu_ops = {
@ -1682,6 +1710,8 @@ static int __init tcmu_module_init(void)
tcmu_attrs[i] = passthrough_attrib_attrs[i];
}
tcmu_attrs[i] = &tcmu_attr_cmd_time_out;
i++;
tcmu_attrs[i] = &tcmu_attr_emulate_write_cache;
tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs;
ret = transport_backend_register(&tcmu_ops);