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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#ifndef DM_INTERNAL_H#define DM_INTERNAL_H
#include <linux/fs.h>#include <linux/device-mapper.h>#include <linux/list.h>#include <linux/moduleparam.h>#include <linux/blkdev.h>#include <linux/backing-dev.h>#include <linux/hdreg.h>#include <linux/completion.h>#include <linux/kobject.h>#include <linux/refcount.h>#include <linux/log2.h>
#include "dm-stats.h"
/* * Suspend feature flags */#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
/* * Status feature flags */#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
/* * List of devices that a metadevice uses and should open/close. */struct dm_dev_internal { struct list_head list; refcount_t count; struct dm_dev *dm_dev;};
struct dm_table;struct dm_md_mempools;struct dm_target_io;struct dm_io;
/* *--------------------------------------------------------------- * Internal table functions. *--------------------------------------------------------------- */void dm_table_event_callback(struct dm_table *t, void (*fn)(void *), void *context);struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);bool dm_table_has_no_data_devices(struct dm_table *table);bool dm_table_is_wildcard(struct dm_table *t);int dm_calculate_queue_limits(struct dm_table *table, struct queue_limits *limits);int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits);struct list_head *dm_table_get_devices(struct dm_table *t);void dm_table_presuspend_targets(struct dm_table *t);void dm_table_presuspend_undo_targets(struct dm_table *t);void dm_table_postsuspend_targets(struct dm_table *t);int dm_table_resume_targets(struct dm_table *t);enum dm_queue_mode dm_table_get_type(struct dm_table *t);struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);struct dm_target *dm_table_get_immutable_target(struct dm_table *t);struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);bool dm_table_request_based(struct dm_table *t);bool dm_table_supports_size_change(struct dm_table *t, sector_t old_size, sector_t new_size);
void dm_lock_md_type(struct mapped_device *md);void dm_unlock_md_type(struct mapped_device *md);enum dm_queue_mode dm_get_md_type(struct mapped_device *md);struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
/* * To check whether the target type is bio-based or not (request-based). */#define dm_target_bio_based(t) ((t)->type->map != NULL)
/* * To check whether the target type is request-based or not (bio-based). */#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
/* * To check whether the target type is a hybrid (capable of being * either request-based or bio-based). */#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
/* * Zoned targets related functions. */int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *lim);int dm_revalidate_zones(struct dm_table *t, struct request_queue *q);void dm_finalize_zone_settings(struct dm_table *t, struct queue_limits *lim);void dm_zone_endio(struct dm_io *io, struct bio *clone);#ifdef CONFIG_BLK_DEV_ZONEDint dm_blk_report_zones(struct gendisk *disk, sector_t sector, unsigned int nr_zones, struct blk_report_zones_args *args);bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);int dm_zone_get_reset_bitmap(struct mapped_device *md, struct dm_table *t, sector_t sector, unsigned int nr_zones, unsigned long *need_reset);#define dm_has_zone_plugs(md) ((md)->disk->zone_wplugs_hash != NULL)#else#define dm_blk_report_zones NULLstatic inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio){ return false;}#define dm_has_zone_plugs(md) false#endif
/* *--------------------------------------------------------------- * A registry of target types. *--------------------------------------------------------------- */int dm_target_init(void);void dm_target_exit(void);struct target_type *dm_get_target_type(const char *name);void dm_put_target_type(struct target_type *tt);int dm_target_iterate(void (*iter_func)(struct target_type *tt, void *param), void *param);
int dm_split_args(int *argc, char ***argvp, char *input);
/* * Is this mapped_device being deleted? */int dm_deleting_md(struct mapped_device *md);
/* * Is this mapped_device suspended? */int dm_suspended_md(struct mapped_device *md);
/* * Internal suspend and resume methods. */int dm_suspended_internally_md(struct mapped_device *md);void dm_internal_suspend_fast(struct mapped_device *md);void dm_internal_resume_fast(struct mapped_device *md);void dm_internal_suspend_noflush(struct mapped_device *md);void dm_internal_resume(struct mapped_device *md);
/* * Test if the device is scheduled for deferred remove. */int dm_test_deferred_remove_flag(struct mapped_device *md);
/* * Try to remove devices marked for deferred removal. */void dm_deferred_remove(void);
/* * The device-mapper can be driven through one of two interfaces; * ioctl or filesystem, depending which patch you have applied. */int dm_interface_init(void);void dm_interface_exit(void);
/* * sysfs interface */int dm_sysfs_init(struct mapped_device *md);void dm_sysfs_exit(struct mapped_device *md);struct kobject *dm_kobject(struct mapped_device *md);struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
/* * The kobject helper */void dm_kobject_release(struct kobject *kobj);
/* * Targets for linear and striped mappings */int linear_map(struct dm_target *ti, struct bio *bio);int dm_linear_init(void);void dm_linear_exit(void);
int stripe_map(struct dm_target *ti, struct bio *bio);int dm_stripe_init(void);void dm_stripe_exit(void);
/* * mapped_device operations */void dm_destroy(struct mapped_device *md);void dm_destroy_immediate(struct mapped_device *md);int dm_open_count(struct mapped_device *md);int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);int dm_cancel_deferred_remove(struct mapped_device *md);int dm_request_based(struct mapped_device *md);int dm_get_table_device(struct mapped_device *md, dev_t dev, blk_mode_t mode, struct dm_dev **result);void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, unsigned int cookie, bool need_resize_uevent);
int dm_io_init(void);void dm_io_exit(void);
int dm_kcopyd_init(void);void dm_kcopyd_exit(void);
/* * Mempool operations */void dm_free_md_mempools(struct dm_md_mempools *pools);
/* * Various helpers */unsigned int dm_get_reserved_bio_based_ios(void);
#define DM_HASH_LOCKS_MAX 64
static inline unsigned int dm_num_hash_locks(void){ unsigned int num_locks = roundup_pow_of_two(num_online_cpus()) << 1;
return min_t(unsigned int, num_locks, DM_HASH_LOCKS_MAX);}
#define DM_HASH_LOCKS_MULT 4294967291ULL#define DM_HASH_LOCKS_SHIFT 6
static inline unsigned int dm_hash_locks_index(sector_t block, unsigned int num_locks){ sector_t h1 = (block * DM_HASH_LOCKS_MULT) >> DM_HASH_LOCKS_SHIFT; sector_t h2 = h1 >> DM_HASH_LOCKS_SHIFT;
return (h1 ^ h2) & (num_locks - 1);}
#endif