/* * Internal header file _only_ for device mapper core * * Copyright (C) 2016 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ #ifndef DM_CORE_INTERNAL_H #define DM_CORE_INTERNAL_H #include <linux/kthread.h> #include <linux/ktime.h> #include <linux/blk-mq.h> #include <trace/events/block.h> #include "dm.h" #define DM_RESERVED_MAX_IOS 1024 struct dm_kobject_holder { struct kobject kobj; struct completion completion; }; /* * DM core internal structure that used directly by dm.c and dm-rq.c * DM targets must _not_ deference a mapped_device to directly access its 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; /* * freeze/thaw support require holding onto a super block */ struct super_block *frozen_sb; /* forced geometry settings */ struct hd_geometry geometry; /* kobject and completion */ struct dm_kobject_holder kobj_holder; struct block_device *bdev; 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; }; 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 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); #endif