/* * 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 <linux/blk-crypto-profile.h> #include <linux/jump_label.h> #include <trace/events/block.h> #include "dm.h" #include "dm-ima.h" #define DM_RESERVED_MAX_IOS 1024 struct dm_io; struct dm_kobject_holder { struct kobject kobj; struct completion completion; }; /* * DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c. * DM targets must _not_ deference a mapped_device or dm_table to directly * access their members! */ /* * For mempools pre-allocation at the table loading time. */ struct dm_md_mempools { struct bio_set bs; struct bio_set io_bs; }; 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; wait_queue_head_t wait; unsigned long __percpu *pending_io; /* forced geometry settings */ struct hd_geometry geometry; /* * Processing queue (flush) */ struct workqueue_struct *wq; /* * A list of ios that arrived while we were suspended. */ struct work_struct work; spinlock_t deferred_lock; struct bio_list deferred; /* * requeue work context is needed for cloning one new bio * to represent the dm_io to be requeued, since each * dm_io may point to the original bio from FS. */ struct work_struct requeue_work; struct dm_io *requeue_list; 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 */ /* for blk-mq request-based DM support */ bool init_tio_pdu:1; struct blk_mq_tag_set *tag_set; struct dm_stats stats; /* the number of internal suspends */ unsigned internal_suspend_count; int swap_bios; struct semaphore swap_bios_semaphore; struct mutex swap_bios_lock; /* * io objects are allocated from here. */ struct dm_md_mempools *mempools; /* kobject and completion */ struct dm_kobject_holder kobj_holder; struct srcu_struct io_barrier; #ifdef CONFIG_BLK_DEV_ZONED unsigned int nr_zones; unsigned int *zwp_offset; #endif #ifdef CONFIG_IMA struct dm_ima_measurements ima; #endif }; /* * Bits for the flags field of struct mapped_device. */ #define DMF_BLOCK_IO_FOR_SUSPEND 0 #define DMF_SUSPENDED 1 #define DMF_FROZEN 2 #define DMF_FREEING 3 #define DMF_DELETING 4 #define DMF_NOFLUSH_SUSPENDING 5 #define DMF_DEFERRED_REMOVE 6 #define DMF_SUSPENDED_INTERNALLY 7 #define DMF_POST_SUSPENDING 8 #define DMF_EMULATE_ZONE_APPEND 9 void disable_discard(struct mapped_device *md); void disable_write_zeroes(struct mapped_device *md); static inline sector_t dm_get_size(struct mapped_device *md) { return get_capacity(md->disk); } static inline struct dm_stats *dm_get_stats(struct mapped_device *md) { return &md->stats; } DECLARE_STATIC_KEY_FALSE(stats_enabled); DECLARE_STATIC_KEY_FALSE(swap_bios_enabled); DECLARE_STATIC_KEY_FALSE(zoned_enabled); static inline bool dm_emulate_zone_append(struct mapped_device *md) { if (blk_queue_is_zoned(md->queue)) return test_bit(DMF_EMULATE_ZONE_APPEND, &md->flags); return false; } #define DM_TABLE_MAX_DEPTH 16 struct dm_table { struct mapped_device *md; enum dm_queue_mode type; /* btree table */ unsigned int depth; unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */ sector_t *index[DM_TABLE_MAX_DEPTH]; unsigned int num_targets; unsigned int num_allocated; sector_t *highs; struct dm_target *targets; struct target_type *immutable_target_type; bool integrity_supported:1; bool singleton:1; unsigned integrity_added:1; /* * Indicates the rw permissions for the new logical * device. This should be a combination of FMODE_READ * and FMODE_WRITE. */ fmode_t mode; /* a list of devices used by this table */ struct list_head devices; /* events get handed up using this callback */ void (*event_fn)(void *); void *event_context; struct dm_md_mempools *mempools; #ifdef CONFIG_BLK_INLINE_ENCRYPTION struct blk_crypto_profile *crypto_profile; #endif }; static inline struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) { BUG_ON(index >= t->num_targets); return t->targets + index; } /* * One of these is allocated per clone bio. */ #define DM_TIO_MAGIC 28714 struct dm_target_io { unsigned short magic; blk_short_t flags; unsigned int target_bio_nr; struct dm_io *io; struct dm_target *ti; unsigned int *len_ptr; sector_t old_sector; struct bio clone; }; #define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone)) #define DM_IO_BIO_OFFSET \ (offsetof(struct dm_target_io, clone) + offsetof(struct dm_io, tio)) /* * dm_target_io flags */ enum { DM_TIO_INSIDE_DM_IO, DM_TIO_IS_DUPLICATE_BIO }; static inline bool dm_tio_flagged(struct dm_target_io *tio, unsigned int bit) { return (tio->flags & (1U << bit)) != 0; } static inline void dm_tio_set_flag(struct dm_target_io *tio, unsigned int bit) { tio->flags |= (1U << bit); } static inline bool dm_tio_is_normal(struct dm_target_io *tio) { return (dm_tio_flagged(tio, DM_TIO_INSIDE_DM_IO) && !dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO)); } /* * One of these is allocated per original bio. * It contains the first clone used for that original. */ #define DM_IO_MAGIC 19577 struct dm_io { unsigned short magic; blk_short_t flags; spinlock_t lock; unsigned long start_time; void *data; struct dm_io *next; struct dm_stats_aux stats_aux; blk_status_t status; atomic_t io_count; struct mapped_device *md; /* The three fields represent mapped part of original bio */ struct bio *orig_bio; unsigned int sector_offset; /* offset to end of orig_bio */ unsigned int sectors; /* last member of dm_target_io is 'struct bio' */ struct dm_target_io tio; }; /* * dm_io flags */ enum { DM_IO_ACCOUNTED, DM_IO_WAS_SPLIT }; static inline bool dm_io_flagged(struct dm_io *io, unsigned int bit) { return (io->flags & (1U << bit)) != 0; } static inline void dm_io_set_flag(struct dm_io *io, unsigned int bit) { io->flags |= (1U << bit); } void dm_io_rewind(struct dm_io *io, struct bio_set *bs); 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