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- /*
- * 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 int 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 int __dm_get_module_param(unsigned int *module_param, unsigned int def, unsigned int max);
- static inline bool dm_message_test_buffer_overflow(char *result, unsigned int 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
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