From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/md/dm.h | 227 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 drivers/md/dm.h (limited to 'drivers/md/dm.h') diff --git a/drivers/md/dm.h b/drivers/md/dm.h new file mode 100644 index 000000000..a7917df09 --- /dev/null +++ b/drivers/md/dm.h @@ -0,0 +1,227 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 -- cgit v1.2.3