2 * Internal header file _only_ for device mapper core
4 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
6 * This file is released under the LGPL.
9 #ifndef DM_CORE_INTERNAL_H
10 #define DM_CORE_INTERNAL_H
12 #include <linux/kthread.h>
13 #include <linux/ktime.h>
14 #include <linux/genhd.h>
15 #include <linux/blk-mq.h>
16 #include <linux/keyslot-manager.h>
18 #include <trace/events/block.h>
22 #define DM_RESERVED_MAX_IOS 1024
24 struct dm_kobject_holder {
26 struct completion completion;
30 * DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c.
31 * DM targets must _not_ deference a mapped_device or dm_table to directly
32 * access their members!
35 struct mapped_device {
36 struct mutex suspend_lock;
38 struct mutex table_devices_lock;
39 struct list_head table_devices;
42 * The current mapping (struct dm_table *).
43 * Use dm_get_live_table{_fast} or take suspend_lock for
50 /* Protect queue and type against concurrent access. */
51 struct mutex type_lock;
52 enum dm_queue_mode type;
55 struct request_queue *queue;
60 struct dm_target *immutable_target;
61 struct target_type *immutable_target_type;
65 struct dax_device *dax_dev;
68 * A list of ios that arrived while we were suspended.
70 struct work_struct work;
71 wait_queue_head_t wait;
72 spinlock_t deferred_lock;
73 struct bio_list deferred;
80 wait_queue_head_t eventq;
83 struct list_head uevent_list;
84 spinlock_t uevent_lock; /* Protect access to uevent_list */
86 /* the number of internal suspends */
87 unsigned internal_suspend_count;
90 * io objects are allocated from here.
96 * Processing queue (flush)
98 struct workqueue_struct *wq;
100 /* forced geometry settings */
101 struct hd_geometry geometry;
103 /* kobject and completion */
104 struct dm_kobject_holder kobj_holder;
107 struct semaphore swap_bios_semaphore;
108 struct mutex swap_bios_lock;
110 struct dm_stats stats;
112 /* for blk-mq request-based DM support */
113 struct blk_mq_tag_set *tag_set;
116 struct srcu_struct io_barrier;
119 void disable_discard(struct mapped_device *md);
120 void disable_write_same(struct mapped_device *md);
121 void disable_write_zeroes(struct mapped_device *md);
123 static inline sector_t dm_get_size(struct mapped_device *md)
125 return get_capacity(md->disk);
128 static inline struct dm_stats *dm_get_stats(struct mapped_device *md)
133 #define DM_TABLE_MAX_DEPTH 16
136 struct mapped_device *md;
137 enum dm_queue_mode type;
141 unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */
142 sector_t *index[DM_TABLE_MAX_DEPTH];
144 unsigned int num_targets;
145 unsigned int num_allocated;
147 struct dm_target *targets;
149 struct target_type *immutable_target_type;
151 bool integrity_supported:1;
153 unsigned integrity_added:1;
156 * Indicates the rw permissions for the new logical
157 * device. This should be a combination of FMODE_READ
162 /* a list of devices used by this table */
163 struct list_head devices;
165 /* events get handed up using this callback */
166 void (*event_fn)(void *);
169 struct dm_md_mempools *mempools;
171 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
172 struct blk_keyslot_manager *ksm;
176 static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
178 return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
181 unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max);
183 static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
185 return !maxlen || strlen(result) + 1 >= maxlen;
188 extern atomic_t dm_global_event_nr;
189 extern wait_queue_head_t dm_global_eventq;
190 void dm_issue_global_event(void);