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192 lines
4.0 KiB
192 lines
4.0 KiB
/* |
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* Internal header file _only_ for device mapper core |
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* |
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* Copyright (C) 2016 Red Hat, Inc. All rights reserved. |
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* |
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* This file is released under the LGPL. |
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*/ |
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#ifndef DM_CORE_INTERNAL_H |
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#define DM_CORE_INTERNAL_H |
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#include <linux/kthread.h> |
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#include <linux/ktime.h> |
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#include <linux/genhd.h> |
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#include <linux/blk-mq.h> |
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#include <linux/keyslot-manager.h> |
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#include <trace/events/block.h> |
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#include "dm.h" |
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#define DM_RESERVED_MAX_IOS 1024 |
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struct dm_kobject_holder { |
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struct kobject kobj; |
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struct completion completion; |
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}; |
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/* |
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* DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c. |
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* DM targets must _not_ deference a mapped_device or dm_table to directly |
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* access their members! |
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*/ |
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struct mapped_device { |
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struct mutex suspend_lock; |
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struct mutex table_devices_lock; |
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struct list_head table_devices; |
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/* |
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* The current mapping (struct dm_table *). |
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* Use dm_get_live_table{_fast} or take suspend_lock for |
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* dereference. |
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*/ |
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void __rcu *map; |
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unsigned long flags; |
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/* Protect queue and type against concurrent access. */ |
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struct mutex type_lock; |
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enum dm_queue_mode type; |
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int numa_node_id; |
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struct request_queue *queue; |
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atomic_t holders; |
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atomic_t open_count; |
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struct dm_target *immutable_target; |
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struct target_type *immutable_target_type; |
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char name[16]; |
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struct gendisk *disk; |
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struct dax_device *dax_dev; |
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/* |
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* A list of ios that arrived while we were suspended. |
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*/ |
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struct work_struct work; |
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wait_queue_head_t wait; |
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spinlock_t deferred_lock; |
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struct bio_list deferred; |
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void *interface_ptr; |
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/* |
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* Event handling. |
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*/ |
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wait_queue_head_t eventq; |
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atomic_t event_nr; |
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atomic_t uevent_seq; |
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struct list_head uevent_list; |
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spinlock_t uevent_lock; /* Protect access to uevent_list */ |
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/* the number of internal suspends */ |
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unsigned internal_suspend_count; |
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/* |
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* io objects are allocated from here. |
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*/ |
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struct bio_set io_bs; |
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struct bio_set bs; |
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/* |
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* Processing queue (flush) |
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*/ |
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struct workqueue_struct *wq; |
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/* forced geometry settings */ |
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struct hd_geometry geometry; |
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/* kobject and completion */ |
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struct dm_kobject_holder kobj_holder; |
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int swap_bios; |
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struct semaphore swap_bios_semaphore; |
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struct mutex swap_bios_lock; |
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struct dm_stats stats; |
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/* for blk-mq request-based DM support */ |
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struct blk_mq_tag_set *tag_set; |
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bool init_tio_pdu:1; |
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struct srcu_struct io_barrier; |
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}; |
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void disable_discard(struct mapped_device *md); |
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void disable_write_same(struct mapped_device *md); |
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void disable_write_zeroes(struct mapped_device *md); |
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static inline sector_t dm_get_size(struct mapped_device *md) |
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{ |
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return get_capacity(md->disk); |
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} |
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static inline struct dm_stats *dm_get_stats(struct mapped_device *md) |
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{ |
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return &md->stats; |
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} |
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#define DM_TABLE_MAX_DEPTH 16 |
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struct dm_table { |
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struct mapped_device *md; |
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enum dm_queue_mode type; |
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/* btree table */ |
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unsigned int depth; |
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unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */ |
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sector_t *index[DM_TABLE_MAX_DEPTH]; |
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unsigned int num_targets; |
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unsigned int num_allocated; |
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sector_t *highs; |
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struct dm_target *targets; |
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struct target_type *immutable_target_type; |
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bool integrity_supported:1; |
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bool singleton:1; |
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unsigned integrity_added:1; |
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/* |
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* Indicates the rw permissions for the new logical |
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* device. This should be a combination of FMODE_READ |
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* and FMODE_WRITE. |
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*/ |
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fmode_t mode; |
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/* a list of devices used by this table */ |
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struct list_head devices; |
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/* events get handed up using this callback */ |
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void (*event_fn)(void *); |
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void *event_context; |
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struct dm_md_mempools *mempools; |
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#ifdef CONFIG_BLK_INLINE_ENCRYPTION |
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struct blk_keyslot_manager *ksm; |
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#endif |
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}; |
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static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj) |
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{ |
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return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; |
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} |
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unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max); |
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static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) |
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{ |
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return !maxlen || strlen(result) + 1 >= maxlen; |
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} |
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extern atomic_t dm_global_event_nr; |
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extern wait_queue_head_t dm_global_eventq; |
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void dm_issue_global_event(void); |
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#endif
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