| /* |
| * 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 dm_report_zones_args; |
| 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, STATUSTYPE_IMA } 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); |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| typedef int (*dm_report_zones_fn) (struct dm_target *ti, |
| struct dm_report_zones_args *args, |
| unsigned int nr_zones); |
| #else |
| /* |
| * Define dm_report_zones_fn so that targets can assign to NULL if |
| * CONFIG_BLK_DEV_ZONED disabled. Otherwise each target needs to do |
| * awkward #ifdefs in their target_type, etc. |
| */ |
| typedef int (*dm_report_zones_fn) (struct dm_target *dummy); |
| #endif |
| |
| /* |
| * 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); |
| typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff, |
| size_t nr_pages); |
| |
| 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; |
| dm_report_zones_fn report_zones; |
| 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; |
| dm_dax_zero_page_range_fn dax_zero_page_range; |
| |
| /* 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 support for zoned block devices: |
| * - DM_TARGET_ZONED_HM: the target also supports host-managed zoned |
| * block devices but does not support combining different zoned models. |
| * - DM_TARGET_MIXED_ZONED_MODEL: the target supports combining multiple |
| * devices with different zoned models. |
| */ |
| #ifdef CONFIG_BLK_DEV_ZONED |
| #define DM_TARGET_ZONED_HM 0x00000040 |
| #define dm_target_supports_zoned_hm(type) ((type)->features & DM_TARGET_ZONED_HM) |
| #else |
| #define DM_TARGET_ZONED_HM 0x00000000 |
| #define dm_target_supports_zoned_hm(type) (false) |
| #endif |
| |
| /* |
| * A target handles REQ_NOWAIT |
| */ |
| #define DM_TARGET_NOWAIT 0x00000080 |
| #define dm_target_supports_nowait(type) ((type)->features & DM_TARGET_NOWAIT) |
| |
| /* |
| * A target supports passing through inline crypto support. |
| */ |
| #define DM_TARGET_PASSES_CRYPTO 0x00000100 |
| #define dm_target_passes_crypto(type) ((type)->features & DM_TARGET_PASSES_CRYPTO) |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| #define DM_TARGET_MIXED_ZONED_MODEL 0x00000200 |
| #define dm_target_supports_mixed_zoned_model(type) \ |
| ((type)->features & DM_TARGET_MIXED_ZONED_MODEL) |
| #else |
| #define DM_TARGET_MIXED_ZONED_MODEL 0x00000000 |
| #define dm_target_supports_mixed_zoned_model(type) (false) |
| #endif |
| |
| 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; |
| |
| /* |
| * Set if this target implements a a zoned device and needs emulation of |
| * zone append operations using regular writes. |
| */ |
| bool emulate_zone_append:1; |
| }; |
| |
| 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); |
| union map_info *dm_get_rq_mapinfo(struct request *rq); |
| |
| #ifdef CONFIG_BLK_DEV_ZONED |
| struct dm_report_zones_args { |
| struct dm_target *tgt; |
| sector_t next_sector; |
| |
| void *orig_data; |
| report_zones_cb orig_cb; |
| unsigned int zone_idx; |
| |
| /* must be filled by ->report_zones before calling dm_report_zones_cb */ |
| sector_t start; |
| }; |
| int dm_report_zones(struct block_device *bdev, sector_t start, sector_t sector, |
| struct dm_report_zones_args *args, unsigned int nr_zones); |
| #endif /* CONFIG_BLK_DEV_ZONED */ |
| |
| /* |
| * 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 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); |
| |
| /* |
| * Table blk_crypto_profile functions |
| */ |
| void dm_destroy_crypto_profile(struct blk_crypto_profile *profile); |
| |
| /*----------------------------------------------------------------- |
| * 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__) |
| |
| #define DMDEBUG(fmt, ...) pr_debug(DM_FMT(fmt), ##__VA_ARGS__) |
| #define DMDEBUG_LIMIT(fmt, ...) pr_debug_ratelimited(DM_FMT(fmt), ##__VA_ARGS__) |
| |
| #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ |
| 0 : scnprintf(result + sz, maxlen - sz, x)) |
| |
| #define DMEMIT_TARGET_NAME_VERSION(y) \ |
| DMEMIT("target_name=%s,target_version=%u.%u.%u", \ |
| (y)->name, (y)->version[0], (y)->version[1], (y)->version[2]) |
| |
| /* |
| * 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)) |
| |
| /* |
| * 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 */ |