^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Internal header file for device mapper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2001, 2002 Sistina Software
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This file is released under the LGPL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #ifndef DM_INTERNAL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define DM_INTERNAL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/device-mapper.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/hdreg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/kobject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/refcount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "dm-stats.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Suspend feature flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Status feature flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DM_STATUS_NOFLUSH_FLAG (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * List of devices that a metadevice uses and should open/close.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct dm_dev_internal {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) refcount_t count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct dm_dev *dm_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct dm_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct dm_md_mempools;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*-----------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Internal table functions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *---------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void dm_table_event_callback(struct dm_table *t,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) void (*fn)(void *), void *context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) bool dm_table_has_no_data_devices(struct dm_table *table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int dm_calculate_queue_limits(struct dm_table *table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct queue_limits *limits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct queue_limits *limits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct list_head *dm_table_get_devices(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void dm_table_presuspend_targets(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void dm_table_presuspend_undo_targets(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) void dm_table_postsuspend_targets(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int dm_table_resume_targets(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) enum dm_queue_mode dm_table_get_type(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) bool dm_table_bio_based(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) bool dm_table_request_based(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) void dm_table_free_md_mempools(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int *blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) sector_t start, sector_t len, void *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) void dm_lock_md_type(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) void dm_unlock_md_type(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * To check whether the target type is bio-based or not (request-based).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define dm_target_bio_based(t) ((t)->type->map != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * To check whether the target type is request-based or not (bio-based).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * To check whether the target type is a hybrid (capable of being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * either request-based or bio-based).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /*-----------------------------------------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * A registry of target types.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *---------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int dm_target_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) void dm_target_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct target_type *dm_get_target_type(const char *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void dm_put_target_type(struct target_type *tt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int dm_target_iterate(void (*iter_func)(struct target_type *tt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) void *param), void *param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int dm_split_args(int *argc, char ***argvp, char *input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * Is this mapped_device being deleted?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int dm_deleting_md(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * Is this mapped_device suspended?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int dm_suspended_md(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Internal suspend and resume methods.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int dm_suspended_internally_md(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void dm_internal_suspend_fast(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) void dm_internal_resume_fast(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) void dm_internal_suspend_noflush(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) void dm_internal_resume(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * Test if the device is scheduled for deferred remove.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int dm_test_deferred_remove_flag(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * Try to remove devices marked for deferred removal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) void dm_deferred_remove(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * The device-mapper can be driven through one of two interfaces;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * ioctl or filesystem, depending which patch you have applied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int dm_interface_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) void dm_interface_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * sysfs interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) int dm_sysfs_init(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) void dm_sysfs_exit(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct kobject *dm_kobject(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * The kobject helper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) void dm_kobject_release(struct kobject *kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * Targets for linear and striped mappings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int dm_linear_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) void dm_linear_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int dm_stripe_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void dm_stripe_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * mapped_device operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) void dm_destroy(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) void dm_destroy_immediate(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int dm_open_count(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int dm_cancel_deferred_remove(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int dm_request_based(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct dm_dev **result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) unsigned cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) void dm_internal_suspend(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) void dm_internal_resume(struct mapped_device *md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int dm_io_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) void dm_io_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) int dm_kcopyd_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) void dm_kcopyd_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * Mempool operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) unsigned integrity, unsigned per_bio_data_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) unsigned min_pool_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) void dm_free_md_mempools(struct dm_md_mempools *pools);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * Various helpers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) unsigned dm_get_reserved_bio_based_ios(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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