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Commit b1943fd4 authored by Mike Christie's avatar Mike Christie Committed by Nicholas Bellinger
Browse files

target: add helper to iterate over devices 



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

Signed-off-by: default avatarMike Christie <mchristi@redhat.com>
Reviewed-by: default avatarBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent b3af66e2

drivers/target/target_core_device.c

+45 −0
Original line number Diff line number Diff line
@@ -904,6 +904,51 @@ struct se_device *target_find_device(int id, bool do_depend) 
}

EXPORT_SYMBOL(target_find_device);



struct devices_idr_iter {

	int (*fn)(struct se_device *dev, void *data);

	void *data;

};



static int target_devices_idr_iter(int id, void *p, void *data)

{

	struct devices_idr_iter *iter = data;

	struct se_device *dev = p;



	/*

	 * We add the device early to the idr, so it can be used

	 * by backend modules during configuration. We do not want

	 * to allow other callers to access partially setup devices,

	 * so we skip them here.

	 */

	if (!(dev->dev_flags & DF_CONFIGURED))

		return 0;



	return iter->fn(dev, iter->data);

}



/**

 * target_for_each_device - iterate over configured devices

 * @fn: iterator function

 * @data: pointer to data that will be passed to fn

 *

 * fn must return 0 to continue looping over devices. non-zero will break

 * from the loop and return that value to the caller.

 */

int target_for_each_device(int (*fn)(struct se_device *dev, void *data),

			   void *data)

{

	struct devices_idr_iter iter;

	int ret;



	iter.fn = fn;

	iter.data = data;



	mutex_lock(&g_device_mutex);

	ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);

	mutex_unlock(&g_device_mutex);

	return ret;

}



int target_configure_device(struct se_device *dev)

{

	struct se_hba *hba = dev->se_hba;

drivers/target/target_core_internal.h

+2 −0
Original line number Diff line number Diff line
@@ -87,6 +87,8 @@ void core_dev_release_virtual_lun0(void); 
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)(struct se_device *dev, void *data),

			       void *data);



/* target_core_configfs.c */

void	target_setup_backend_cits(struct target_backend *);