target core: add device action configfs files

Web:        https://git.kernel.org/torvalds/c/8dc31ff9298963425f5c4bb6011bc2bedb76b1e9
Commit:     8dc31ff9298963425f5c4bb6011bc2bedb76b1e9
Parent:     a24e7917e1758daf9ac0da4fac0f7b48f0b4b624
Refname:    refs/heads/master
Author:     Mike Christie <[email protected]>
AuthorDate: Tue Dec 19 04:03:57 2017 -0600
Committer:  Nicholas Bellinger <[email protected]>
CommitDate: Tue Jan 16 18:05:04 2018 -0800

    target core: add device action configfs files
    
    This patch adds a new group of files that are to be used to
    have the kernel module execution some action. The next patch
    will have target_core_user use the group/files to be able to block
    a device and to reset its memory buffer used to pass commands
    between user/kernel space.
    
    This type of file is different from the existing device attributes
    in that they may be write only and when written to they result in
    the kernel module executing some function. These need to be
    separate from the normal device attributes which get/set device
    values so userspace can continue to loop over all the attribs and
    get/set them during initialization.
    
    Signed-off-by: Mike Christie <[email protected]>
    Signed-off-by: Nicholas Bellinger <[email protected]>
---
 drivers/target/target_core_configfs.c | 6 ++++++
 drivers/target/target_core_internal.h | 1 +
 include/target/target_core_backend.h  | 1 +
 include/target/target_core_base.h     | 1 +
 4 files changed, 9 insertions(+)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 72b1cd1bf9d9..3f4bf126eed0 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1197,6 +1197,7 @@ struct configfs_attribute *passthrough_attrib_attrs[] = {
 EXPORT_SYMBOL(passthrough_attrib_attrs);
 
 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
+TB_CIT_SETUP_DRV(dev_action, NULL, NULL);
 
 /* End functions for struct config_item_type tb_dev_attrib_cit */
 
@@ -2940,6 +2941,10 @@ static struct config_group *target_core_make_subdev(
 
 	config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
 
+	config_group_init_type_name(&dev->dev_action_group, "action",
+			&tb->tb_dev_action_cit);
+	configfs_add_default_group(&dev->dev_action_group, &dev->dev_group);
+
 	config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
 			&tb->tb_dev_attrib_cit);
 	configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
@@ -3200,6 +3205,7 @@ static const struct config_item_type target_core_cit = {
 void target_setup_backend_cits(struct target_backend *tb)
 {
 	target_core_setup_dev_cit(tb);
+	target_core_setup_dev_action_cit(tb);
 	target_core_setup_dev_attrib_cit(tb);
 	target_core_setup_dev_pr_cit(tb);
 	target_core_setup_dev_wwn_cit(tb);
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 6d53d9fcb883..1d5afc3ae017 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -17,6 +17,7 @@ struct target_backend {
 
 	struct config_item_type tb_dev_cit;
 	struct config_item_type tb_dev_attrib_cit;
+	struct config_item_type tb_dev_action_cit;
 	struct config_item_type tb_dev_pr_cit;
 	struct config_item_type tb_dev_wwn_cit;
 	struct config_item_type tb_dev_alua_tg_pt_gps_cit;
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index b6b3fb444a92..34a15d59ed88 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -53,6 +53,7 @@ struct target_backend_ops {
 	void (*free_prot)(struct se_device *);
 
 	struct configfs_attribute **tb_dev_attrib_attrs;
+	struct configfs_attribute **tb_dev_action_attrs;
 };
 
 struct sbc_ops {
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 00482f903dec..9f9f5902af38 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -809,6 +809,7 @@ struct se_device {
 	/* T10 SPC-2 + SPC-3 Reservations */
 	struct t10_reservation	t10_pr;
 	struct se_dev_attrib	dev_attrib;
+	struct config_group	dev_action_group;
 	struct config_group	dev_group;
 	struct config_group	dev_pr_group;
 	struct se_dev_stat_grps dev_stat_grps;
--
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