/* * Copyright (C) 2004 Red Hat, Inc. All rights reserved. * * This file is released under the GPL. * * Multipath hardware handler registration. */ #ifndef DM_HW_HANDLER_H #define DM_HW_HANDLER_H #include <linux/device-mapper.h> #include "dm-mpath.h" struct hw_handler_type; struct hw_handler { struct hw_handler_type *type; struct mapped_device *md; void *context; }; /* * Constructs a hardware handler object, takes custom arguments */ /* Information about a hardware handler type */ struct hw_handler_type { char *name; struct module *module; int (*create) (struct hw_handler *handler, unsigned int argc, char **argv); void (*destroy) (struct hw_handler *hwh); void (*pg_init) (struct hw_handler *hwh, unsigned bypassed, struct dm_path *path); unsigned (*error) (struct hw_handler *hwh, struct bio *bio); int (*status) (struct hw_handler *hwh, status_type_t type, char *result, unsigned int maxlen); }; /* Register a hardware handler */ int dm_register_hw_handler(struct hw_handler_type *type); /* Unregister a hardware handler */ int dm_unregister_hw_handler(struct hw_handler_type *type); /* Returns a registered hardware handler type */ struct hw_handler_type *dm_get_hw_handler(const char *name); /* Releases a hardware handler */ void dm_put_hw_handler(struct hw_handler_type *hwht); /* Default err function */ unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio); /* Error flags for err and dm_pg_init_complete */ #define MP_FAIL_PATH 1 #define MP_BYPASS_PG 2 #define MP_ERROR_IO 4 /* Don't retry this I/O */ #define MP_RETRY 8 #endif