drivers/md/dm-uevent.c

Source file repositories/reference/linux-study-clean/drivers/md/dm-uevent.c

File Facts

System
Linux kernel
Corpus path
drivers/md/dm-uevent.c
Extension
.c
Size
4779 bytes
Lines
207
Domain
Driver Families
Bucket
drivers/md
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dm_uevent {
	struct mapped_device *md;
	enum kobject_action action;
	struct kobj_uevent_env ku_env;
	struct list_head elist;
	char name[DM_NAME_LEN];
	char uuid[DM_UUID_LEN];
};

static void dm_uevent_free(struct dm_uevent *event)
{
	kmem_cache_free(_dm_event_cache, event);
}

static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
{
	struct dm_uevent *event;

	event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
	if (!event)
		return NULL;

	INIT_LIST_HEAD(&event->elist);
	event->md = md;

	return event;
}

static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
					      struct dm_target *ti,
					      enum kobject_action action,
					      const char *dm_action,
					      const char *path,
					      unsigned int nr_valid_paths)
{
	struct dm_uevent *event;

	event = dm_uevent_alloc(md);
	if (!event) {
		DMERR("%s: dm_uevent_alloc() failed", __func__);
		goto err_nomem;
	}

	event->action = action;

	if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) {
		DMERR("%s: add_uevent_var() for DM_TARGET failed",
		      __func__);
		goto err_add;
	}

	if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) {
		DMERR("%s: add_uevent_var() for DM_ACTION failed",
		      __func__);
		goto err_add;
	}

	if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u",
			   dm_next_uevent_seq(md))) {
		DMERR("%s: add_uevent_var() for DM_SEQNUM failed",
		      __func__);
		goto err_add;
	}

	if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
		DMERR("%s: add_uevent_var() for DM_PATH failed", __func__);
		goto err_add;
	}

	if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
			   nr_valid_paths)) {
		DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
		      __func__);
		goto err_add;
	}

	return event;

err_add:
	dm_uevent_free(event);
err_nomem:
	return ERR_PTR(-ENOMEM);
}

/**
 * dm_send_uevents - send uevents for given list
 *
 * @events:	list of events to send
 * @kobj:	kobject generating event
 *

Annotation

Implementation Notes