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>
23 #define DM_RESERVED_MAX_IOS 1024
25 struct dm_kobject_holder {
27 struct completion completion;
31 * DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c.
32 * DM targets must _not_ deference a mapped_device or dm_table to directly
33 * access their members!
36 struct mapped_device {
37 struct mutex suspend_lock;
39 struct mutex table_devices_lock;
40 struct list_head table_devices;
43 * The current mapping (struct dm_table *).
44 * Use dm_get_live_table{_fast} or take suspend_lock for
51 /* Protect queue and type against concurrent access. */
52 struct mutex type_lock;
53 enum dm_queue_mode type;
56 struct request_queue *queue;
61 struct dm_target *immutable_target;
62 struct target_type *immutable_target_type;
66 struct dax_device *dax_dev;
68 unsigned long __percpu *pending_io;
71 * A list of ios that arrived while we were suspended.
73 struct work_struct work;
74 wait_queue_head_t wait;
75 spinlock_t deferred_lock;
76 struct bio_list deferred;
83 wait_queue_head_t eventq;
86 struct list_head uevent_list;
87 spinlock_t uevent_lock; /* Protect access to uevent_list */
89 /* the number of internal suspends */
90 unsigned internal_suspend_count;
93 * io objects are allocated from here.
99 * Processing queue (flush)
101 struct workqueue_struct *wq;
103 /* forced geometry settings */
104 struct hd_geometry geometry;
106 /* kobject and completion */
107 struct dm_kobject_holder kobj_holder;
110 struct semaphore swap_bios_semaphore;
111 struct mutex swap_bios_lock;
113 struct dm_stats stats;
115 /* for blk-mq request-based DM support */
116 struct blk_mq_tag_set *tag_set;
119 struct srcu_struct io_barrier;
121 #ifdef CONFIG_BLK_DEV_ZONED
122 unsigned int nr_zones;
123 unsigned int *zwp_offset;
127 struct dm_ima_measurements ima;
132 * Bits for the flags field of struct mapped_device.
134 #define DMF_BLOCK_IO_FOR_SUSPEND 0
135 #define DMF_SUSPENDED 1
137 #define DMF_FREEING 3
138 #define DMF_DELETING 4
139 #define DMF_NOFLUSH_SUSPENDING 5
140 #define DMF_DEFERRED_REMOVE 6
141 #define DMF_SUSPENDED_INTERNALLY 7
142 #define DMF_POST_SUSPENDING 8
143 #define DMF_EMULATE_ZONE_APPEND 9
145 void disable_discard(struct mapped_device *md);
146 void disable_write_same(struct mapped_device *md);
147 void disable_write_zeroes(struct mapped_device *md);
149 static inline sector_t dm_get_size(struct mapped_device *md)
151 return get_capacity(md->disk);
154 static inline struct dm_stats *dm_get_stats(struct mapped_device *md)
159 static inline bool dm_emulate_zone_append(struct mapped_device *md)
161 if (blk_queue_is_zoned(md->queue))
162 return test_bit(DMF_EMULATE_ZONE_APPEND, &md->flags);
166 #define DM_TABLE_MAX_DEPTH 16
169 struct mapped_device *md;
170 enum dm_queue_mode type;
174 unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */
175 sector_t *index[DM_TABLE_MAX_DEPTH];
177 unsigned int num_targets;
178 unsigned int num_allocated;
180 struct dm_target *targets;
182 struct target_type *immutable_target_type;
184 bool integrity_supported:1;
186 unsigned integrity_added:1;
189 * Indicates the rw permissions for the new logical
190 * device. This should be a combination of FMODE_READ
195 /* a list of devices used by this table */
196 struct list_head devices;
198 /* events get handed up using this callback */
199 void (*event_fn)(void *);
202 struct dm_md_mempools *mempools;
204 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
205 struct blk_keyslot_manager *ksm;
210 * One of these is allocated per clone bio.
212 #define DM_TIO_MAGIC 7282014
213 struct dm_target_io {
216 struct dm_target *ti;
217 unsigned int target_bio_nr;
218 unsigned int *len_ptr;
224 * One of these is allocated per original bio.
225 * It contains the first clone used for that original.
227 #define DM_IO_MAGIC 5191977
230 struct mapped_device *md;
233 struct bio *orig_bio;
234 unsigned long start_time;
235 spinlock_t endio_lock;
236 struct dm_stats_aux stats_aux;
237 /* last member of dm_target_io is 'struct bio' */
238 struct dm_target_io tio;
241 static inline void dm_io_inc_pending(struct dm_io *io)
243 atomic_inc(&io->io_count);
246 void dm_io_dec_pending(struct dm_io *io, blk_status_t error);
248 static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
250 return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
253 unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max);
255 static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
257 return !maxlen || strlen(result) + 1 >= maxlen;
260 extern atomic_t dm_global_event_nr;
261 extern wait_queue_head_t dm_global_eventq;
262 void dm_issue_global_event(void);