[RFC,7/9] target: add helper to iterate over devices

Commit Message

Mike Christie June 12, 2017, 10:10 a.m. UTC

This just adds a wrapper around idr_for_each so the xcopy
code can loop over the devices in the next patch.

Signed-off-by: Mike Christie <[e-mail]>
---
 drivers/target/target_core_device.c   | 10 ++++++++++
 drivers/target/target_core_internal.h |  2 ++
 2 files changed, 12 insertions(+)

Patch

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 9f2a527..eea52732 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -891,6 +891,16 @@  struct se_device *target_find_device(int id)
 }
 EXPORT_SYMBOL(target_find_device);
 
+int target_for_each_device(int (*fn)(int id, void *p, void *data), void *data)
+{
+	int ret;
+
+	mutex_lock(&g_device_mutex);
+	ret = idr_for_each(&devices_idr, fn, data);
+	mutex_unlock(&g_device_mutex);
+	return ret;
+}
+
 void target_init_device_idr(void)
 {
 	idr_init(&devices_idr);
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index dfa923b..605e25b 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -87,6 +87,8 @@  void	core_dev_free_initiator_node_lun_acl(struct se_portal_group *,
 struct se_device *target_alloc_device(struct se_hba *hba, const char *name);
 int	target_configure_device(struct se_device *dev);
 void	target_free_device(struct se_device *);
+int	target_for_each_device(int (*fn)(int id, void *p, void *data),
+			       void *data);
 
 /* target_core_configfs.c */
 void	target_setup_backend_cits(struct target_backend *);