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340 lines
7.2 KiB
340 lines
7.2 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/blk-mq.h> |
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#include <linux/blk-crypto-profile.h> |
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#include <linux/jump_label.h> |
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#include <trace/events/block.h> |
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#include "dm.h" |
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#include "dm-ima.h" |
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#define DM_RESERVED_MAX_IOS 1024 |
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struct dm_io; |
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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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/* |
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* For mempools pre-allocation at the table loading time. |
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*/ |
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struct dm_md_mempools { |
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struct bio_set bs; |
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struct bio_set io_bs; |
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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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wait_queue_head_t wait; |
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unsigned long __percpu *pending_io; |
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/* forced geometry settings */ |
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struct hd_geometry geometry; |
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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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/* |
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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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spinlock_t deferred_lock; |
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struct bio_list deferred; |
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/* |
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* requeue work context is needed for cloning one new bio |
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* to represent the dm_io to be requeued, since each |
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* dm_io may point to the original bio from FS. |
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*/ |
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struct work_struct requeue_work; |
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struct dm_io *requeue_list; |
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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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/* for blk-mq request-based DM support */ |
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bool init_tio_pdu:1; |
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struct blk_mq_tag_set *tag_set; |
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struct dm_stats stats; |
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/* the number of internal suspends */ |
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unsigned internal_suspend_count; |
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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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/* |
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* io objects are allocated from here. |
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*/ |
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struct dm_md_mempools *mempools; |
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/* kobject and completion */ |
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struct dm_kobject_holder kobj_holder; |
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struct srcu_struct io_barrier; |
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#ifdef CONFIG_BLK_DEV_ZONED |
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unsigned int nr_zones; |
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unsigned int *zwp_offset; |
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#endif |
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#ifdef CONFIG_IMA |
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struct dm_ima_measurements ima; |
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#endif |
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}; |
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/* |
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* Bits for the flags field of struct mapped_device. |
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*/ |
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#define DMF_BLOCK_IO_FOR_SUSPEND 0 |
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#define DMF_SUSPENDED 1 |
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#define DMF_FROZEN 2 |
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#define DMF_FREEING 3 |
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#define DMF_DELETING 4 |
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#define DMF_NOFLUSH_SUSPENDING 5 |
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#define DMF_DEFERRED_REMOVE 6 |
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#define DMF_SUSPENDED_INTERNALLY 7 |
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#define DMF_POST_SUSPENDING 8 |
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#define DMF_EMULATE_ZONE_APPEND 9 |
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void disable_discard(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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DECLARE_STATIC_KEY_FALSE(stats_enabled); |
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DECLARE_STATIC_KEY_FALSE(swap_bios_enabled); |
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DECLARE_STATIC_KEY_FALSE(zoned_enabled); |
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static inline bool dm_emulate_zone_append(struct mapped_device *md) |
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{ |
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if (blk_queue_is_zoned(md->queue)) |
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return test_bit(DMF_EMULATE_ZONE_APPEND, &md->flags); |
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return false; |
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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_crypto_profile *crypto_profile; |
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#endif |
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}; |
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static inline struct dm_target *dm_table_get_target(struct dm_table *t, |
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unsigned int index) |
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{ |
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BUG_ON(index >= t->num_targets); |
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return t->targets + index; |
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} |
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/* |
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* One of these is allocated per clone bio. |
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*/ |
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#define DM_TIO_MAGIC 28714 |
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struct dm_target_io { |
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unsigned short magic; |
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blk_short_t flags; |
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unsigned int target_bio_nr; |
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struct dm_io *io; |
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struct dm_target *ti; |
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unsigned int *len_ptr; |
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sector_t old_sector; |
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struct bio clone; |
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}; |
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#define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone)) |
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#define DM_IO_BIO_OFFSET \ |
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(offsetof(struct dm_target_io, clone) + offsetof(struct dm_io, tio)) |
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/* |
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* dm_target_io flags |
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*/ |
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enum { |
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DM_TIO_INSIDE_DM_IO, |
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DM_TIO_IS_DUPLICATE_BIO |
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}; |
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static inline bool dm_tio_flagged(struct dm_target_io *tio, unsigned int bit) |
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{ |
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return (tio->flags & (1U << bit)) != 0; |
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} |
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static inline void dm_tio_set_flag(struct dm_target_io *tio, unsigned int bit) |
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{ |
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tio->flags |= (1U << bit); |
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} |
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static inline bool dm_tio_is_normal(struct dm_target_io *tio) |
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{ |
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return (dm_tio_flagged(tio, DM_TIO_INSIDE_DM_IO) && |
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!dm_tio_flagged(tio, DM_TIO_IS_DUPLICATE_BIO)); |
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} |
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/* |
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* One of these is allocated per original bio. |
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* It contains the first clone used for that original. |
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*/ |
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#define DM_IO_MAGIC 19577 |
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struct dm_io { |
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unsigned short magic; |
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blk_short_t flags; |
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spinlock_t lock; |
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unsigned long start_time; |
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void *data; |
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struct dm_io *next; |
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struct dm_stats_aux stats_aux; |
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blk_status_t status; |
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atomic_t io_count; |
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struct mapped_device *md; |
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/* The three fields represent mapped part of original bio */ |
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struct bio *orig_bio; |
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unsigned int sector_offset; /* offset to end of orig_bio */ |
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unsigned int sectors; |
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/* last member of dm_target_io is 'struct bio' */ |
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struct dm_target_io tio; |
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}; |
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/* |
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* dm_io flags |
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*/ |
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enum { |
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DM_IO_ACCOUNTED, |
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DM_IO_WAS_SPLIT |
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}; |
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static inline bool dm_io_flagged(struct dm_io *io, unsigned int bit) |
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{ |
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return (io->flags & (1U << bit)) != 0; |
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} |
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static inline void dm_io_set_flag(struct dm_io *io, unsigned int bit) |
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{ |
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io->flags |= (1U << bit); |
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} |
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void dm_io_rewind(struct dm_io *io, struct bio_set *bs); |
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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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