blob: 55dccdfbcb22ee27e4098e6aeb5cbd07807c9614 [file] [log] [blame]
* Internal header file _only_ for device mapper core
* Copyright (C) 2016 Red Hat, Inc. All rights reserved.
* This file is released under the LGPL.
#include <linux/kthread.h>
#include <linux/ktime.h>
#include <linux/genhd.h>
#include <linux/blk-mq.h>
#include <linux/keyslot-manager.h>
#include <trace/events/block.h>
#include "dm.h"
#include "dm-ima.h"
#define DM_RESERVED_MAX_IOS 1024
struct dm_kobject_holder {
struct kobject kobj;
struct completion completion;
* DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c.
* DM targets must _not_ deference a mapped_device or dm_table to directly
* access their members!
struct mapped_device {
struct mutex suspend_lock;
struct mutex table_devices_lock;
struct list_head table_devices;
* The current mapping (struct dm_table *).
* Use dm_get_live_table{_fast} or take suspend_lock for
* dereference.
void __rcu *map;
unsigned long flags;
/* Protect queue and type against concurrent access. */
struct mutex type_lock;
enum dm_queue_mode type;
int numa_node_id;
struct request_queue *queue;
atomic_t holders;
atomic_t open_count;
struct dm_target *immutable_target;
struct target_type *immutable_target_type;
char name[16];
struct gendisk *disk;
struct dax_device *dax_dev;
* A list of ios that arrived while we were suspended.
struct work_struct work;
wait_queue_head_t wait;
spinlock_t deferred_lock;
struct bio_list deferred;
void *interface_ptr;
* Event handling.
wait_queue_head_t eventq;
atomic_t event_nr;
atomic_t uevent_seq;
struct list_head uevent_list;
spinlock_t uevent_lock; /* Protect access to uevent_list */
/* the number of internal suspends */
unsigned internal_suspend_count;
* io objects are allocated from here.
struct bio_set io_bs;
struct bio_set bs;
* Processing queue (flush)
struct workqueue_struct *wq;
/* forced geometry settings */
struct hd_geometry geometry;
/* kobject and completion */
struct dm_kobject_holder kobj_holder;
int swap_bios;
struct semaphore swap_bios_semaphore;
struct mutex swap_bios_lock;
struct dm_stats stats;
/* for blk-mq request-based DM support */
struct blk_mq_tag_set *tag_set;
bool init_tio_pdu:1;
struct srcu_struct io_barrier;
unsigned int nr_zones;
unsigned int *zwp_offset;
struct dm_ima_measurements ima;
* Bits for the flags field of struct mapped_device.
#define DMF_FROZEN 2
#define DMF_FREEING 3
#define DMF_DELETING 4
void disable_discard(struct mapped_device *md);
void disable_write_same(struct mapped_device *md);
void disable_write_zeroes(struct mapped_device *md);
static inline sector_t dm_get_size(struct mapped_device *md)
return get_capacity(md->disk);
static inline struct dm_stats *dm_get_stats(struct mapped_device *md)
return &md->stats;
static inline bool dm_emulate_zone_append(struct mapped_device *md)
if (blk_queue_is_zoned(md->queue))
return test_bit(DMF_EMULATE_ZONE_APPEND, &md->flags);
return false;
struct dm_table {
struct mapped_device *md;
enum dm_queue_mode type;
/* btree table */
unsigned int depth;
unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */
sector_t *index[DM_TABLE_MAX_DEPTH];
unsigned int num_targets;
unsigned int num_allocated;
sector_t *highs;
struct dm_target *targets;
struct target_type *immutable_target_type;
bool integrity_supported:1;
bool singleton:1;
unsigned integrity_added:1;
* Indicates the rw permissions for the new logical
* device. This should be a combination of FMODE_READ
fmode_t mode;
/* a list of devices used by this table */
struct list_head devices;
/* events get handed up using this callback */
void (*event_fn)(void *);
void *event_context;
struct dm_md_mempools *mempools;
struct blk_keyslot_manager *ksm;
* One of these is allocated per clone bio.
#define DM_TIO_MAGIC 7282014
struct dm_target_io {
unsigned int magic;
struct dm_io *io;
struct dm_target *ti;
unsigned int target_bio_nr;
unsigned int *len_ptr;
bool inside_dm_io;
struct bio clone;
* One of these is allocated per original bio.
* It contains the first clone used for that original.
#define DM_IO_MAGIC 5191977
struct dm_io {
unsigned int magic;
struct mapped_device *md;
blk_status_t status;
atomic_t io_count;
struct bio *orig_bio;
unsigned long start_time;
spinlock_t endio_lock;
struct dm_stats_aux stats_aux;
/* last member of dm_target_io is 'struct bio' */
struct dm_target_io tio;
static inline void dm_io_inc_pending(struct dm_io *io)
void dm_io_dec_pending(struct dm_io *io, blk_status_t error);
static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max);
static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
return !maxlen || strlen(result) + 1 >= maxlen;
extern atomic_t dm_global_event_nr;
extern wait_queue_head_t dm_global_eventq;
void dm_issue_global_event(void);