/* * Internal header file for device mapper * * Copyright (C) 2001, 2002 Sistina Software * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ #ifndef DM_INTERNAL_H #define DM_INTERNAL_H #include <linux/fs.h> #include <linux/device-mapper.h> #include <linux/list.h> #include <linux/moduleparam.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/hdreg.h> #include <linux/completion.h> #include <linux/kobject.h> #include <linux/refcount.h> #include "dm-stats.h" /* * Suspend feature flags */ #define DM_SUSPEND_LOCKFS_FLAG (1 << 0) #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) /* * Status feature flags */ #define DM_STATUS_NOFLUSH_FLAG (1 << 0) /* * List of devices that a metadevice uses and should open/close. */ struct dm_dev_internal { struct list_head list; refcount_t count; struct dm_dev *dm_dev; }; struct dm_table; struct dm_md_mempools; struct dm_target_io; struct dm_io; /* *--------------------------------------------------------------- * Internal table functions. *--------------------------------------------------------------- */ void dm_table_event_callback(struct dm_table *t, void (*fn)(void *), void *context); struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); bool dm_table_has_no_data_devices(struct dm_table *table); int dm_calculate_queue_limits(struct dm_table *table, struct queue_limits *limits); int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits); struct list_head *dm_table_get_devices(struct dm_table *t); void dm_table_presuspend_targets(struct dm_table *t); void dm_table_presuspend_undo_targets(struct dm_table *t); void dm_table_postsuspend_targets(struct dm_table *t); int dm_table_resume_targets(struct dm_table *t); enum dm_queue_mode dm_table_get_type(struct dm_table *t); struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); struct dm_target *dm_table_get_immutable_target(struct dm_table *t); struct dm_target *dm_table_get_wildcard_target(struct dm_table *t); bool dm_table_bio_based(struct dm_table *t); bool dm_table_request_based(struct dm_table *t); void dm_lock_md_type(struct mapped_device *md); void dm_unlock_md_type(struct mapped_device *md); void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type); enum dm_queue_mode dm_get_md_type(struct mapped_device *md); struct target_type *dm_get_immutable_target_type(struct mapped_device *md); int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t); /* * To check whether the target type is bio-based or not (request-based). */ #define dm_target_bio_based(t) ((t)->type->map != NULL) /* * To check whether the target type is request-based or not (bio-based). */ #define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL) /* * To check whether the target type is a hybrid (capable of being * either request-based or bio-based). */ #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) /* * Zoned targets related functions. */ int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q); void dm_zone_endio(struct dm_io *io, struct bio *clone); #ifdef CONFIG_BLK_DEV_ZONED void dm_cleanup_zoned_dev(struct mapped_device *md); int dm_blk_report_zones(struct gendisk *disk, sector_t sector, unsigned int nr_zones, report_zones_cb cb, void *data); bool dm_is_zone_write(struct mapped_device *md, struct bio *bio); int dm_zone_map_bio(struct dm_target_io *io); #else static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {} #define dm_blk_report_zones NULL static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio) { return false; } static inline int dm_zone_map_bio(struct dm_target_io *tio) { return DM_MAPIO_KILL; } #endif /* *--------------------------------------------------------------- * A registry of target types. *--------------------------------------------------------------- */ int dm_target_init(void); void dm_target_exit(void); struct target_type *dm_get_target_type(const char *name); void dm_put_target_type(struct target_type *tt); int dm_target_iterate(void (*iter_func)(struct target_type *tt, void *param), void *param); int dm_split_args(int *argc, char ***argvp, char *input); /* * Is this mapped_device being deleted? */ int dm_deleting_md(struct mapped_device *md); /* * Is this mapped_device suspended? */ int dm_suspended_md(struct mapped_device *md); /* * Internal suspend and resume methods. */ int dm_suspended_internally_md(struct mapped_device *md); void dm_internal_suspend_fast(struct mapped_device *md); void dm_internal_resume_fast(struct mapped_device *md); void dm_internal_suspend_noflush(struct mapped_device *md); void dm_internal_resume(struct mapped_device *md); /* * Test if the device is scheduled for deferred remove. */ int dm_test_deferred_remove_flag(struct mapped_device *md); /* * Try to remove devices marked for deferred removal. */ void dm_deferred_remove(void); /* * The device-mapper can be driven through one of two interfaces; * ioctl or filesystem, depending which patch you have applied. */ int dm_interface_init(void); void dm_interface_exit(void); /* * sysfs interface */ int dm_sysfs_init(struct mapped_device *md); void dm_sysfs_exit(struct mapped_device *md); struct kobject *dm_kobject(struct mapped_device *md); struct mapped_device *dm_get_from_kobject(struct kobject *kobj); /* * The kobject helper */ void dm_kobject_release(struct kobject *kobj); /* * Targets for linear and striped mappings */ int dm_linear_init(void); void dm_linear_exit(void); int dm_stripe_init(void); void dm_stripe_exit(void); /* * mapped_device operations */ void dm_destroy(struct mapped_device *md); void dm_destroy_immediate(struct mapped_device *md); int dm_open_count(struct mapped_device *md); int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); int dm_cancel_deferred_remove(struct mapped_device *md); int dm_request_based(struct mapped_device *md); int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, struct dm_dev **result); void dm_put_table_device(struct mapped_device *md, struct dm_dev *d); int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, unsigned int cookie, bool need_resize_uevent); void dm_internal_suspend(struct mapped_device *md); void dm_internal_resume(struct mapped_device *md); int dm_io_init(void); void dm_io_exit(void); int dm_kcopyd_init(void); void dm_kcopyd_exit(void); /* * Mempool operations */ void dm_free_md_mempools(struct dm_md_mempools *pools); /* * Various helpers */ unsigned int dm_get_reserved_bio_based_ios(void); #endif