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/* * Copyright (C) 2001 Sistina Software (UK) Limited. * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. / #ifndef _LINUX_DEVICE_MAPPER_H #define _LINUX_DEVICE_MAPPER_H #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/dm-ioctl.h> #include <linux/math64.h> #include <linux/ratelimit.h> struct dm_dev; struct dm_target; struct dm_table; struct mapped_device; struct bio_vec; / * Type of table, mapped_device's mempool and request_queue / enum dm_queue_mode { DM_TYPE_NONE = 0, DM_TYPE_BIO_BASED = 1, DM_TYPE_REQUEST_BASED = 2, DM_TYPE_DAX_BIO_BASED = 3, }; typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; union map_info { void ptr; }; /* * In the constructor the target parameter will already have the * table, type, begin and len fields filled in. / typedef int (dm_ctr_fn) (struct dm_target target, unsigned int argc, char argv); / * The destructor doesn't need to free the dm_target, just * anything hidden ti->private. / typedef void (dm_dtr_fn) (struct dm_target ti); / * The map function must return: * < 0: error * = 0: The target will handle the io by resubmitting it later * = 1: simple remap complete * = 2: The target wants to push back the io / typedef int (dm_map_fn) (struct dm_target ti, struct bio bio); typedef int (dm_clone_and_map_request_fn) (struct dm_target ti, struct request rq, union map_info map_context, struct request *clone); typedef void (dm_release_clone_request_fn) (struct request clone, union map_info map_context); /* * Returns: * < 0 : error (currently ignored) * 0 : ended successfully * 1 : for some reason the io has still not completed (eg, * multipath target might want to requeue a failed io). * 2 : The target wants to push back the io / typedef int (dm_endio_fn) (struct dm_target ti, struct bio bio, blk_status_t error); typedef int (dm_request_endio_fn) (struct dm_target ti, struct request clone, blk_status_t error, union map_info map_context); typedef void (dm_presuspend_fn) (struct dm_target ti); typedef void (dm_presuspend_undo_fn) (struct dm_target ti); typedef void (dm_postsuspend_fn) (struct dm_target ti); typedef int (dm_preresume_fn) (struct dm_target ti); typedef void (dm_resume_fn) (struct dm_target ti); typedef void (dm_status_fn) (struct dm_target ti, status_type_t status_type, unsigned status_flags, char result, unsigned maxlen); typedef int (dm_message_fn) (struct dm_target ti, unsigned argc, char *argv, char result, unsigned maxlen); typedef int (dm_prepare_ioctl_fn) (struct dm_target ti, struct block_device *bdev); typedef int (dm_report_zones_fn) (struct dm_target ti, sector_t sector, struct blk_zone zones, unsigned int nr_zones); / * These iteration functions are typically used to check (and combine) * properties of underlying devices. * E.g. Does at least one underlying device support flush? * Does any underlying device not support WRITE_SAME? * * The callout function is called once for each contiguous section of * an underlying device. State can be maintained in data. Return non-zero to stop iterating through any further devices. / typedef int (iterate_devices_callout_fn) (struct dm_target ti, struct dm_dev dev, sector_t start, sector_t len, void data); / * This function must iterate through each section of device used by the * target until it encounters a non-zero return code, which it then returns. * Returns zero if no callout returned non-zero. / typedef int (dm_iterate_devices_fn) (struct dm_target ti, iterate_devices_callout_fn fn, void data); typedef void (dm_io_hints_fn) (struct dm_target ti, struct queue_limits limits); / * Returns: * 0: The target can handle the next I/O immediately. * 1: The target can't handle the next I/O immediately. / typedef int (dm_busy_fn) (struct dm_target ti); / * Returns: * < 0 : error * >= 0 : the number of bytes accessible at the address / typedef long (dm_dax_direct_access_fn) (struct dm_target ti, pgoff_t pgoff, long nr_pages, void kaddr, pfn_t pfn); typedef size_t (dm_dax_copy_iter_fn)(struct dm_target ti, pgoff_t pgoff, void addr, size_t bytes, struct iov_iter i); #define PAGE_SECTORS (PAGE_SIZE / 512) void dm_error(const char message); struct dm_dev { struct block_device bdev; struct dax_device dax_dev; fmode_t mode; char name[16]; }; dev_t dm_get_dev_t(const char path); /* * Constructors should call these functions to ensure destination devices * are opened/closed correctly. / int dm_get_device(struct dm_target ti, const char path, fmode_t mode, struct dm_dev result); void dm_put_device(struct dm_target ti, struct dm_dev d); / * Information about a target type / struct target_type { uint64_t features; const char name; struct module module; unsigned version[3]; dm_ctr_fn ctr; dm_dtr_fn dtr; dm_map_fn map; dm_clone_and_map_request_fn clone_and_map_rq; dm_release_clone_request_fn release_clone_rq; dm_endio_fn end_io; dm_request_endio_fn rq_end_io; dm_presuspend_fn presuspend; dm_presuspend_undo_fn presuspend_undo; dm_postsuspend_fn postsuspend; dm_preresume_fn preresume; dm_resume_fn resume; dm_status_fn status; dm_message_fn message; dm_prepare_ioctl_fn prepare_ioctl; #ifdef CONFIG_BLK_DEV_ZONED dm_report_zones_fn report_zones; #endif dm_busy_fn busy; dm_iterate_devices_fn iterate_devices; dm_io_hints_fn io_hints; dm_dax_direct_access_fn direct_access; dm_dax_copy_iter_fn dax_copy_from_iter; dm_dax_copy_iter_fn dax_copy_to_iter; / For internal device-mapper use. / struct list_head list; }; / * Target features / / * Any table that contains an instance of this target must have only one. / #define DM_TARGET_SINGLETON 0x00000001 #define dm_target_needs_singleton(type) ((type)->features & DM_TARGET_SINGLETON) / * Indicates that a target does not support read-only devices. / #define DM_TARGET_ALWAYS_WRITEABLE 0x00000002 #define dm_target_always_writeable(type) \ ((type)->features & DM_TARGET_ALWAYS_WRITEABLE) / * Any device that contains a table with an instance of this target may never * have tables containing any different target type. / #define DM_TARGET_IMMUTABLE 0x00000004 #define dm_target_is_immutable(type) ((type)->features & DM_TARGET_IMMUTABLE) / * Indicates that a target may replace any target; even immutable targets. * .map, .map_rq, .clone_and_map_rq and .release_clone_rq are all defined. / #define DM_TARGET_WILDCARD 0x00000008 #define dm_target_is_wildcard(type) ((type)->features & DM_TARGET_WILDCARD) / * A target implements own bio data integrity. / #define DM_TARGET_INTEGRITY 0x00000010 #define dm_target_has_integrity(type) ((type)->features & DM_TARGET_INTEGRITY) / * A target passes integrity data to the lower device. / #define DM_TARGET_PASSES_INTEGRITY 0x00000020 #define dm_target_passes_integrity(type) ((type)->features & DM_TARGET_PASSES_INTEGRITY) / * Indicates that a target supports host-managed zoned block devices. / #define DM_TARGET_ZONED_HM 0x00000040 #define dm_target_supports_zoned_hm(type) ((type)->features & DM_TARGET_ZONED_HM) struct dm_target { struct dm_table table; struct target_type type; / target limits / sector_t begin; sector_t len; / If non-zero, maximum size of I/O submitted to a target. / uint32_t max_io_len; / * A number of zero-length barrier bios that will be submitted * to the target for the purpose of flushing cache. * * The bio number can be accessed with dm_bio_get_target_bio_nr. * It is a responsibility of the target driver to remap these bios * to the real underlying devices. / unsigned num_flush_bios; / * The number of discard bios that will be submitted to the target. * The bio number can be accessed with dm_bio_get_target_bio_nr. / unsigned num_discard_bios; / * The number of secure erase bios that will be submitted to the target. * The bio number can be accessed with dm_bio_get_target_bio_nr. / unsigned num_secure_erase_bios; / * The number of WRITE SAME bios that will be submitted to the target. * The bio number can be accessed with dm_bio_get_target_bio_nr. / unsigned num_write_same_bios; / * The number of WRITE ZEROES bios that will be submitted to the target. * The bio number can be accessed with dm_bio_get_target_bio_nr. / unsigned num_write_zeroes_bios; / * The minimum number of extra bytes allocated in each io for the * target to use. / unsigned per_io_data_size; / target specific data / void private; /* Used to provide an error string from the ctr / char error; /* * Set if this target needs to receive flushes regardless of * whether or not its underlying devices have support. / bool flush_supported:1; / * Set if this target needs to receive discards regardless of * whether or not its underlying devices have support. / bool discards_supported:1; / * Set if we need to limit the number of in-flight bios when swapping. / bool limit_swap_bios:1; }; / Each target can link one of these into the table / struct dm_target_callbacks { struct list_head list; int (congested_fn) (struct dm_target_callbacks , int); }; void dm_per_bio_data(struct bio bio, size_t data_size); struct bio dm_bio_from_per_bio_data(void data, size_t data_size); unsigned dm_bio_get_target_bio_nr(const struct bio bio); u64 dm_start_time_ns_from_clone(struct bio bio); int dm_register_target(struct target_type t); void dm_unregister_target(struct target_type t); / * Target argument parsing. / struct dm_arg_set { unsigned argc; char argv; }; / * The minimum and maximum value of a numeric argument, together with * the error message to use if the number is found to be outside that range. / struct dm_arg { unsigned min; unsigned max; char error; }; /* * Validate the next argument, either returning it as value or, if invalid, returning -EINVAL and setting error. / int dm_read_arg(const struct dm_arg arg, struct dm_arg_set arg_set, unsigned value, char error); / * Process the next argument as the start of a group containing between * arg->min and arg->max further arguments. Either return the size as * num_args or, if invalid, return -EINVAL and set error. / int dm_read_arg_group(const struct dm_arg arg, struct dm_arg_set arg_set, unsigned num_args, char *error); / * Return the current argument and shift to the next. / const char dm_shift_arg(struct dm_arg_set as); / * Move through num_args arguments. / void dm_consume_args(struct dm_arg_set as, unsigned num_args); /----------------------------------------------------------------- Functions for creating and manipulating mapped devices. * Drop the reference with dm_put when you finish with the object. ---------------------------------------------------------------/ /* * DM_ANY_MINOR chooses the next available minor number. / #define DM_ANY_MINOR (-1) int dm_create(int minor, struct mapped_device md); / * Reference counting for md. / struct mapped_device dm_get_md(dev_t dev); void dm_get(struct mapped_device md); int dm_hold(struct mapped_device md); void dm_put(struct mapped_device md); / * An arbitrary pointer may be stored alongside a mapped device. / void dm_set_mdptr(struct mapped_device md, void ptr); void dm_get_mdptr(struct mapped_device md); / * A device can still be used while suspended, but I/O is deferred. / int dm_suspend(struct mapped_device md, unsigned suspend_flags); int dm_resume(struct mapped_device md); / * Event functions. / uint32_t dm_get_event_nr(struct mapped_device md); int dm_wait_event(struct mapped_device md, int event_nr); uint32_t dm_next_uevent_seq(struct mapped_device md); void dm_uevent_add(struct mapped_device md, struct list_head elist); /* * Info functions. / const char dm_device_name(struct mapped_device md); int dm_copy_name_and_uuid(struct mapped_device md, char name, char uuid); struct gendisk dm_disk(struct mapped_device md); int dm_suspended(struct dm_target ti); int dm_post_suspending(struct dm_target ti); int dm_noflush_suspending(struct dm_target ti); void dm_accept_partial_bio(struct bio bio, unsigned n_sectors); void dm_remap_zone_report(struct dm_target ti, sector_t start, struct blk_zone zones, unsigned int nr_zones); union map_info dm_get_rq_mapinfo(struct request rq); / * Device mapper functions to parse and create devices specified by the * parameter "dm-mod.create=" / int __init dm_early_create(struct dm_ioctl dmi, struct dm_target_spec spec_array, char target_params_array); struct queue_limits dm_get_queue_limits(struct mapped_device md); /* * Geometry functions. / int dm_get_geometry(struct mapped_device md, struct hd_geometry geo); int dm_set_geometry(struct mapped_device md, struct hd_geometry geo); /----------------------------------------------------------------- * Functions for manipulating device-mapper tables. ---------------------------------------------------------------/ /* * First create an empty table. / int dm_table_create(struct dm_table result, fmode_t mode, unsigned num_targets, struct mapped_device md); /* * Then call this once for each target. / int dm_table_add_target(struct dm_table t, const char type, sector_t start, sector_t len, char params); /* * Target_ctr should call this if it needs to add any callbacks. / void dm_table_add_target_callbacks(struct dm_table t, struct dm_target_callbacks cb); / * Target can use this to set the table's type. * Can only ever be called from a target's ctr. * Useful for "hybrid" target (supports both bio-based * and request-based). / void dm_table_set_type(struct dm_table t, enum dm_queue_mode type); /* * Finally call this to make the table ready for use. / int dm_table_complete(struct dm_table t); /* * Destroy the table when finished. / void dm_table_destroy(struct dm_table t); /* * Target may require that it is never sent I/O larger than len. / int __must_check dm_set_target_max_io_len(struct dm_target ti, sector_t len); /* * Table reference counting. / struct dm_table dm_get_live_table(struct mapped_device md, int srcu_idx); void dm_put_live_table(struct mapped_device md, int srcu_idx); void dm_sync_table(struct mapped_device md); /* * Queries / sector_t dm_table_get_size(struct dm_table t); unsigned int dm_table_get_num_targets(struct dm_table t); fmode_t dm_table_get_mode(struct dm_table t); struct mapped_device dm_table_get_md(struct dm_table t); const char dm_table_device_name(struct dm_table t); /* * Trigger an event. / void dm_table_event(struct dm_table t); /* * Run the queue for request-based targets. / void dm_table_run_md_queue_async(struct dm_table t); /* * The device must be suspended before calling this method. * Returns the previous table, which the caller must destroy. / struct dm_table dm_swap_table(struct mapped_device md, struct dm_table t); /* * A wrapper around vmalloc. / void dm_vcalloc(unsigned long nmemb, unsigned long elem_size); /----------------------------------------------------------------- Macros. ---------------------------------------------------------------/ #define DM_NAME "device-mapper" #define DM_FMT(fmt) DM_NAME ": " DM_MSG_PREFIX ": " fmt "\n" #define DMCRIT(fmt, ...) pr_crit(DM_FMT(fmt), ##__VA_ARGS__) #define DMERR(fmt, ...) pr_err(DM_FMT(fmt), ##__VA_ARGS__) #define DMERR_LIMIT(fmt, ...) pr_err_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) #define DMWARN(fmt, ...) pr_warn(DM_FMT(fmt), ##__VA_ARGS__) #define DMWARN_LIMIT(fmt, ...) pr_warn_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__) #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) #ifdef CONFIG_DM_DEBUG #define DMDEBUG(fmt, ...) printk(KERN_DEBUG DM_FMT(fmt), ##__VA_ARGS__) #define DMDEBUG_LIMIT(fmt, ...) pr_debug_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) #else #define DMDEBUG(fmt, ...) no_printk(fmt, ##__VA_ARGS__) #define DMDEBUG_LIMIT(fmt, ...) no_printk(fmt, ##__VA_ARGS__) #endif #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ 0 : scnprintf(result + sz, maxlen - sz, x)) /* * Definitions of return values from target end_io function. / #define DM_ENDIO_DONE 0 #define DM_ENDIO_INCOMPLETE 1 #define DM_ENDIO_REQUEUE 2 #define DM_ENDIO_DELAY_REQUEUE 3 / * Definitions of return values from target map function. / #define DM_MAPIO_SUBMITTED 0 #define DM_MAPIO_REMAPPED 1 #define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE #define DM_MAPIO_DELAY_REQUEUE DM_ENDIO_DELAY_REQUEUE #define DM_MAPIO_KILL 4 #define dm_sector_div64(x, y)( \ { \ u64 _res; \ (x) = div64_u64_rem(x, y, &_res); \ _res; \ } \ ) / * Ceiling(n / sz) / #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) #define dm_sector_div_up(n, sz) ( \ { \ sector_t _r = ((n) + (sz) - 1); \ sector_div(_r, (sz)); \ _r; \ } \ ) / * ceiling(n / size) * size / #define dm_round_up(n, sz) (dm_div_up((n), (sz)) (sz)) #define dm_array_too_big(fixed, obj, num) \ ((num) > (UINT_MAX - (fixed)) / (obj)) /* * Sector offset taken relative to the start of the target instead of * relative to the start of the device. / #define dm_target_offset(ti, sector) ((sector) - (ti)->begin) static inline sector_t to_sector(unsigned long long n) { return (n >> SECTOR_SHIFT); } static inline unsigned long to_bytes(sector_t n) { return (n << SECTOR_SHIFT); } #endif / _LINUX_DEVICE_MAPPER_H */

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