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4cc96131 MS |
1 | /* |
2 | * Internal header file _only_ for device mapper core | |
3 | * | |
4 | * Copyright (C) 2016 Red Hat, Inc. All rights reserved. | |
5 | * | |
6 | * This file is released under the LGPL. | |
7 | */ | |
8 | ||
9 | #ifndef DM_CORE_INTERNAL_H | |
10 | #define DM_CORE_INTERNAL_H | |
11 | ||
12 | #include <linux/kthread.h> | |
13 | #include <linux/ktime.h> | |
14 | #include <linux/blk-mq.h> | |
15 | ||
16 | #include <trace/events/block.h> | |
17 | ||
18 | #include "dm.h" | |
19 | ||
20 | #define DM_RESERVED_MAX_IOS 1024 | |
21 | ||
22 | struct dm_kobject_holder { | |
23 | struct kobject kobj; | |
24 | struct completion completion; | |
25 | }; | |
26 | ||
27 | /* | |
28 | * DM core internal structure that used directly by dm.c and dm-rq.c | |
29 | * DM targets must _not_ deference a mapped_device to directly access its members! | |
30 | */ | |
31 | struct mapped_device { | |
32 | struct srcu_struct io_barrier; | |
33 | struct mutex suspend_lock; | |
34 | ||
35 | /* | |
36 | * The current mapping (struct dm_table *). | |
37 | * Use dm_get_live_table{_fast} or take suspend_lock for | |
38 | * dereference. | |
39 | */ | |
40 | void __rcu *map; | |
41 | ||
42 | struct list_head table_devices; | |
43 | struct mutex table_devices_lock; | |
44 | ||
45 | unsigned long flags; | |
46 | ||
47 | struct request_queue *queue; | |
48 | int numa_node_id; | |
49 | ||
50 | unsigned type; | |
51 | /* Protect queue and type against concurrent access. */ | |
52 | struct mutex type_lock; | |
53 | ||
54 | atomic_t holders; | |
55 | atomic_t open_count; | |
56 | ||
57 | struct dm_target *immutable_target; | |
58 | struct target_type *immutable_target_type; | |
59 | ||
60 | struct gendisk *disk; | |
61 | char name[16]; | |
62 | ||
63 | void *interface_ptr; | |
64 | ||
65 | /* | |
66 | * A list of ios that arrived while we were suspended. | |
67 | */ | |
68 | atomic_t pending[2]; | |
69 | wait_queue_head_t wait; | |
70 | struct work_struct work; | |
71 | spinlock_t deferred_lock; | |
72 | struct bio_list deferred; | |
73 | ||
74 | /* | |
75 | * Event handling. | |
76 | */ | |
77 | wait_queue_head_t eventq; | |
78 | atomic_t event_nr; | |
79 | atomic_t uevent_seq; | |
80 | struct list_head uevent_list; | |
81 | spinlock_t uevent_lock; /* Protect access to uevent_list */ | |
82 | ||
83 | /* the number of internal suspends */ | |
84 | unsigned internal_suspend_count; | |
85 | ||
86 | /* | |
87 | * Processing queue (flush) | |
88 | */ | |
89 | struct workqueue_struct *wq; | |
90 | ||
91 | /* | |
92 | * io objects are allocated from here. | |
93 | */ | |
94 | mempool_t *io_pool; | |
95 | mempool_t *rq_pool; | |
96 | ||
97 | struct bio_set *bs; | |
98 | ||
99 | /* | |
100 | * freeze/thaw support require holding onto a super block | |
101 | */ | |
102 | struct super_block *frozen_sb; | |
103 | ||
104 | /* forced geometry settings */ | |
105 | struct hd_geometry geometry; | |
106 | ||
107 | struct block_device *bdev; | |
108 | ||
109 | /* kobject and completion */ | |
110 | struct dm_kobject_holder kobj_holder; | |
111 | ||
112 | /* zero-length flush that will be cloned and submitted to targets */ | |
113 | struct bio flush_bio; | |
114 | ||
115 | struct dm_stats stats; | |
116 | ||
117 | struct kthread_worker kworker; | |
118 | struct task_struct *kworker_task; | |
119 | ||
120 | /* for request-based merge heuristic in dm_request_fn() */ | |
121 | unsigned seq_rq_merge_deadline_usecs; | |
122 | int last_rq_rw; | |
123 | sector_t last_rq_pos; | |
124 | ktime_t last_rq_start_time; | |
125 | ||
126 | /* for blk-mq request-based DM support */ | |
127 | struct blk_mq_tag_set *tag_set; | |
128 | bool use_blk_mq:1; | |
129 | bool init_tio_pdu:1; | |
130 | }; | |
131 | ||
132 | void dm_init_md_queue(struct mapped_device *md); | |
133 | void dm_init_normal_md_queue(struct mapped_device *md); | |
134 | int md_in_flight(struct mapped_device *md); | |
135 | void disable_write_same(struct mapped_device *md); | |
136 | ||
137 | static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj) | |
138 | { | |
139 | return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; | |
140 | } | |
141 | ||
142 | unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max); | |
143 | ||
144 | static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) | |
145 | { | |
146 | return !maxlen || strlen(result) + 1 >= maxlen; | |
147 | } | |
148 | ||
149 | #endif |