hcl.c

linux-2.4.29操作系统的源码

	if (!labelcl_info)
		return(-1);

	/*
	 * Create a symbolic link devfs entry.
	 */
	status = devfs_mk_symlink(de, name, flags, link,
				&new_devfs_handle, labelcl_info);
	if ( (!new_devfs_handle) || (!status) ){
		labelcl_info_destroy((labelcl_info_t *)labelcl_info);
		return(-1);
	}

	/*
	 * If the caller provides a private data pointer, save it in the 
	 * labelcl info structure(fastinfo).  This can be retrieved via
	 * hwgraph_fastinfo_get()
	 */
	if (info)
		hwgraph_fastinfo_set(new_devfs_handle, (arbitrary_info_t)info);

	*handle = new_devfs_handle;
	return(0);

}

/*
 * hwgraph_vertex_destroy - Destroy the devfs entry
 */
int
hwgraph_vertex_destroy(vertex_hdl_t de)
{

	void *labelcl_info = NULL;

	labelcl_info = devfs_get_info(de);
	devfs_unregister(de);

	if (labelcl_info)
		labelcl_info_destroy((labelcl_info_t *)labelcl_info);

	return(0);
}

/*
 * hwgraph_edge_add - This routines has changed from the original conext.
 * All it does now is to create a symbolic link from "from" to "to".
 */
/* ARGSUSED */
int
hwgraph_edge_add(vertex_hdl_t from, vertex_hdl_t to, char *name)
{

	char *path;
	char *s1;
	char *index;
	int name_start;
	vertex_hdl_t handle = NULL;
	int rv;
	int i, count;

	path = kmalloc(1024, GFP_KERNEL);
	memset(path, 0x0, 1024);
	name_start = devfs_generate_path (from, path, 1024);
	s1 = &path[name_start];
	count = 0;
	while (1) {
		index = strstr (s1, "/");
		if (index) {
			count++;
			s1 = ++index;
		} else {
			count++;
			break;
		}
	}

	memset(path, 0x0, 1024);
	name_start = devfs_generate_path (to, path, 1024);

	for (i = 0; i < count; i++) {
		strcat(path,"../");
	}

	strcat(path, &path[name_start]);

	/*
	 * Otherwise, just create a symlink to the vertex.
	 * In this case the vertex was previous created with a REAL pathname.
	 */
	rv = devfs_mk_symlink (from, (const char *)name, 
			       DEVFS_FL_DEFAULT, path,
			       &handle, NULL);

	name_start = devfs_generate_path (handle, path, 1024);
	return(rv);

	
}
/* ARGSUSED */
int
hwgraph_edge_get(vertex_hdl_t from, char *name, vertex_hdl_t *toptr)
{

	int namelen = 0;
	vertex_hdl_t target_handle = NULL;

	if (name == NULL)
		return(-1);

	if (toptr == NULL)
		return(-1);

	/*
	 * If the name is "." just return the current devfs entry handle.
	 */
	if (!strcmp(name, HWGRAPH_EDGELBL_DOT)) {
		if (toptr) {
			*toptr = from;
		}
	} else if (!strcmp(name, HWGRAPH_EDGELBL_DOTDOT)) {
		/*
		 * Hmmm .. should we return the connect point or parent ..
		 * see in hwgraph, the concept of parent is the connectpt!
		 *
		 * Maybe we should see whether the connectpt is set .. if 
		 * not just return the parent!
		 */
		target_handle = hwgraph_connectpt_get(from);
		if (target_handle) {
			/*
			 * Just return the connect point.
			 */
			*toptr = target_handle;
			return(0);
		}
		target_handle = devfs_get_parent(from);
		*toptr = target_handle;

	} else {
		/*
		 * Call devfs to get the devfs entry.
		 */
		namelen = (int) strlen(name);
		target_handle = devfs_find_handle (from, name, 0, 0,
					0, 1); /* Yes traverse symbolic links */
		if (target_handle == NULL)
			return(-1);
		else
		*toptr = target_handle;
	}

	return(0);
}

/*
 * hwgraph_info_add_LBL - Adds a new label for the device.  Mark the info_desc
 *	of the label as INFO_DESC_PRIVATE and store the info in the label.
 */
/* ARGSUSED */
int
hwgraph_info_add_LBL(	vertex_hdl_t de,
			char *name,
			arbitrary_info_t info)
{
	return(labelcl_info_add_LBL(de, name, INFO_DESC_PRIVATE, info));
}

/*
 * hwgraph_info_remove_LBL - Remove the label entry for the device.
 */
/* ARGSUSED */
int
hwgraph_info_remove_LBL(	vertex_hdl_t de,
				char *name,
				arbitrary_info_t *old_info)
{
	return(labelcl_info_remove_LBL(de, name, NULL, old_info));
}

/*
 * hwgraph_info_replace_LBL - replaces an existing label with 
 *	a new label info value.
 */
/* ARGSUSED */
int
hwgraph_info_replace_LBL(	vertex_hdl_t de,
				char *name,
				arbitrary_info_t info,
				arbitrary_info_t *old_info)
{
	return(labelcl_info_replace_LBL(de, name,
			INFO_DESC_PRIVATE, info,
			NULL, old_info));
}
/*
 * hwgraph_info_get_LBL - Get and return the info value in the label of the 
 * 	device.
 */
/* ARGSUSED */
int
hwgraph_info_get_LBL(	vertex_hdl_t de,
			char *name,
			arbitrary_info_t *infop)
{
	return(labelcl_info_get_LBL(de, name, NULL, infop));
}

/*
 * hwgraph_info_get_exported_LBL - Retrieve the info_desc and info pointer 
 *	of the given label for the device.  The weird thing is that the label 
 *	that matches the name is return irrespective of the info_desc value!
 *	Do not understand why the word "exported" is used!
 */
/* ARGSUSED */
int
hwgraph_info_get_exported_LBL(	vertex_hdl_t de,
				char *name,
				int *export_info,
				arbitrary_info_t *infop)
{
	int rc;
	arb_info_desc_t info_desc;

	rc = labelcl_info_get_LBL(de, name, &info_desc, infop);
	if (rc == 0)
		*export_info = (int)info_desc;

	return(rc);
}

/*
 * hwgraph_info_get_next_LBL - Returns the next label info given the 
 *	current label entry in place.
 *
 *	Once again this has no locking or reference count for protection.
 *
 */
/* ARGSUSED */
int
hwgraph_info_get_next_LBL(	vertex_hdl_t de,
				char *buf,
				arbitrary_info_t *infop,
				labelcl_info_place_t *place)
{
	return(labelcl_info_get_next_LBL(de, buf, NULL, infop, place));
}

/*
 * hwgraph_info_export_LBL - Retrieve the specified label entry and modify 
 *	the info_desc field with the given value in nbytes.
 */
/* ARGSUSED */
int
hwgraph_info_export_LBL(vertex_hdl_t de, char *name, int nbytes)
{
	arbitrary_info_t info;
	int rc;

	if (nbytes == 0)
		nbytes = INFO_DESC_EXPORT;

	if (nbytes < 0)
		return(-1);

	rc = labelcl_info_get_LBL(de, name, NULL, &info);
	if (rc != 0)
		return(rc);

	rc = labelcl_info_replace_LBL(de, name,
				nbytes, info, NULL, NULL);

	return(rc);
}

/*
 * hwgraph_info_unexport_LBL - Retrieve the given label entry and change the 
 * label info_descr filed to INFO_DESC_PRIVATE.
 */
/* ARGSUSED */
int
hwgraph_info_unexport_LBL(vertex_hdl_t de, char *name)
{
	arbitrary_info_t info;
	int rc;

	rc = labelcl_info_get_LBL(de, name, NULL, &info);
	if (rc != 0)
		return(rc);

	rc = labelcl_info_replace_LBL(de, name,
				INFO_DESC_PRIVATE, info, NULL, NULL);

	return(rc);
}

/*
 * hwgraph_path_lookup - return the handle for the given path.
 *
 */
int
hwgraph_path_lookup(	vertex_hdl_t start_vertex_handle,
			char *lookup_path,
			vertex_hdl_t *vertex_handle_ptr,
			char **remainder)
{
	*vertex_handle_ptr = devfs_find_handle(start_vertex_handle,	/* start dir */
					lookup_path,		/* path */
					0,			/* major */
					0,			/* minor */
					0,			/* char | block */
					1);			/* traverse symlinks */
	if (*vertex_handle_ptr == NULL)
		return(-1);
	else
		return(0);
}

/*
 * hwgraph_traverse - Find and return the devfs handle starting from de.
 *
 */
graph_error_t
hwgraph_traverse(vertex_hdl_t de, char *path, vertex_hdl_t *found)
{
	/* 
	 * get the directory entry (path should end in a directory)
	 */

	*found = devfs_find_handle(de,	/* start dir */
			    path,	/* path */
			    0,		/* major */
			    0,		/* minor */
			    0,		/* char | block */
			    1);		/* traverse symlinks */
	if (*found == NULL)
		return(GRAPH_NOT_FOUND);
	else
		return(GRAPH_SUCCESS);
}

/*
 * hwgraph_path_to_vertex - Return the devfs entry handle for the given 
 *	pathname .. assume traverse symlinks too!.
 */
vertex_hdl_t
hwgraph_path_to_vertex(char *path)
{
	return(devfs_find_handle(NULL,	/* start dir */
			path,		/* path */
		    	0,		/* major */
		    	0,		/* minor */
		    	0,		/* char | block */
		    	1));		/* traverse symlinks */
}

/*
 * hwgraph_inventory_remove - Removes an inventory entry.
 *
 *	Remove an inventory item associated with a vertex.   It is the caller's
 *	responsibility to make sure that there are no races between removing
 *	inventory from a vertex and simultaneously removing that vertex.
*/
int
hwgraph_inventory_remove(	vertex_hdl_t de,
				int class,
				int type,
				major_t controller,
				minor_t unit,
				int state)
{
	return(0); /* Just a Stub for IRIX code. */
}

/*
 * Find the canonical name for a given vertex by walking back through
 * connectpt's until we hit the hwgraph root vertex (or until we run
 * out of buffer space or until something goes wrong).
 *
 *	COMPATIBILITY FUNCTIONALITY
 * Walks back through 'parents', not necessarily the same as connectpts.
 *
 * Need to resolve the fact that devfs does not return the path from 
 * "/" but rather it just stops right before /dev ..
 */
int
hwgraph_vertex_name_get(vertex_hdl_t vhdl, char *buf, uint buflen)
{
	char *locbuf;
	int   pos;

	if (buflen < 1)
		return(-1);	/* XXX should be GRAPH_BAD_PARAM ? */

	locbuf = kmalloc(buflen, GFP_KERNEL);

	pos = devfs_generate_path(vhdl, locbuf, buflen);
	if (pos < 0) {
		kfree(locbuf);
		return pos;
	}

	strcpy(buf, &locbuf[pos]);
	kfree(locbuf);
	return 0;
}

/*
** vertex_to_name converts a vertex into a canonical name by walking
** back through connect points until we hit the hwgraph root (or until
** we run out of buffer space).
**
** Usually returns a pointer to the original buffer, filled in as
** appropriate.  If the buffer is too small to hold the entire name,
** or if anything goes wrong while determining the name, vertex_to_name
** returns "UnknownDevice".
*/

#define DEVNAME_UNKNOWN "UnknownDevice"

char *
vertex_to_name(vertex_hdl_t vhdl, char *buf, uint buflen)
{
	if (hwgraph_vertex_name_get(vhdl, buf, buflen) == GRAPH_SUCCESS)
		return(buf);
	else
		return(DEVNAME_UNKNOWN);
}

graph_error_t
hwgraph_edge_remove(vertex_hdl_t from, char *name, vertex_hdl_t *toptr)
{
	printk("WARNING: hwgraph_edge_remove NOT supported.\n");
	return(GRAPH_ILLEGAL_REQUEST);
}

graph_error_t
hwgraph_vertex_unref(vertex_hdl_t vhdl)
{
	return(GRAPH_ILLEGAL_REQUEST);
}


EXPORT_SYMBOL(hwgraph_mk_dir);
EXPORT_SYMBOL(hwgraph_path_add);
EXPORT_SYMBOL(hwgraph_register);
EXPORT_SYMBOL(hwgraph_vertex_destroy);
EXPORT_SYMBOL(hwgraph_fastinfo_get);
EXPORT_SYMBOL(hwgraph_fastinfo_set);
EXPORT_SYMBOL(hwgraph_connectpt_set);
EXPORT_SYMBOL(hwgraph_connectpt_get);
EXPORT_SYMBOL(hwgraph_info_add_LBL);
EXPORT_SYMBOL(hwgraph_info_remove_LBL);
EXPORT_SYMBOL(hwgraph_info_replace_LBL);
EXPORT_SYMBOL(hwgraph_info_get_LBL);
EXPORT_SYMBOL(hwgraph_info_get_exported_LBL);
EXPORT_SYMBOL(hwgraph_info_get_next_LBL);
EXPORT_SYMBOL(hwgraph_info_export_LBL);
EXPORT_SYMBOL(hwgraph_info_unexport_LBL);
EXPORT_SYMBOL(hwgraph_path_lookup);
EXPORT_SYMBOL(hwgraph_traverse);
EXPORT_SYMBOL(hwgraph_vertex_name_get);