mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 17:40:54 +07:00
af1db72d8b
Now that unplugging is done differently, the unplug_fn callback is never called, so it can be completely discarded. Signed-off-by: NeilBrown <neilb@suse.de>
432 lines
12 KiB
C
432 lines
12 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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* Copyright (C) 2004-2008 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 _LINUX_DEVICE_MAPPER_H
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#define _LINUX_DEVICE_MAPPER_H
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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struct dm_dev;
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struct dm_target;
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struct dm_table;
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struct mapped_device;
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struct bio_vec;
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typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
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union map_info {
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void *ptr;
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unsigned long long ll;
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unsigned target_request_nr;
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};
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/*
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* In the constructor the target parameter will already have the
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* table, type, begin and len fields filled in.
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*/
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typedef int (*dm_ctr_fn) (struct dm_target *target,
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unsigned int argc, char **argv);
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/*
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* The destructor doesn't need to free the dm_target, just
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* anything hidden ti->private.
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*/
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typedef void (*dm_dtr_fn) (struct dm_target *ti);
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/*
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* The map function must return:
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* < 0: error
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* = 0: The target will handle the io by resubmitting it later
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* = 1: simple remap complete
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* = 2: The target wants to push back the io
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*/
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typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
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union map_info *map_context);
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typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone,
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union map_info *map_context);
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/*
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* Returns:
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* < 0 : error (currently ignored)
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* 0 : ended successfully
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* 1 : for some reason the io has still not completed (eg,
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* multipath target might want to requeue a failed io).
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* 2 : The target wants to push back the io
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*/
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typedef int (*dm_endio_fn) (struct dm_target *ti,
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struct bio *bio, int error,
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union map_info *map_context);
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typedef int (*dm_request_endio_fn) (struct dm_target *ti,
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struct request *clone, int error,
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union map_info *map_context);
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typedef void (*dm_flush_fn) (struct dm_target *ti);
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typedef void (*dm_presuspend_fn) (struct dm_target *ti);
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typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
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typedef int (*dm_preresume_fn) (struct dm_target *ti);
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typedef void (*dm_resume_fn) (struct dm_target *ti);
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typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
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char *result, unsigned int maxlen);
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typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
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typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
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unsigned long arg);
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typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
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struct bio_vec *biovec, int max_size);
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typedef int (*iterate_devices_callout_fn) (struct dm_target *ti,
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struct dm_dev *dev,
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sector_t start, sector_t len,
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void *data);
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typedef int (*dm_iterate_devices_fn) (struct dm_target *ti,
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iterate_devices_callout_fn fn,
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void *data);
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typedef void (*dm_io_hints_fn) (struct dm_target *ti,
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struct queue_limits *limits);
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/*
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* Returns:
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* 0: The target can handle the next I/O immediately.
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* 1: The target can't handle the next I/O immediately.
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*/
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typedef int (*dm_busy_fn) (struct dm_target *ti);
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void dm_error(const char *message);
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/*
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* Combine device limits.
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*/
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int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
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sector_t start, sector_t len, void *data);
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struct dm_dev {
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struct block_device *bdev;
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fmode_t mode;
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char name[16];
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};
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/*
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* Constructors should call these functions to ensure destination devices
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* are opened/closed correctly.
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*/
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int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
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struct dm_dev **result);
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void dm_put_device(struct dm_target *ti, struct dm_dev *d);
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/*
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* Information about a target type
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*/
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/*
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* Target features
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*/
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struct target_type {
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uint64_t features;
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const char *name;
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struct module *module;
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unsigned version[3];
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dm_ctr_fn ctr;
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dm_dtr_fn dtr;
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dm_map_fn map;
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dm_map_request_fn map_rq;
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dm_endio_fn end_io;
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dm_request_endio_fn rq_end_io;
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dm_flush_fn flush;
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dm_presuspend_fn presuspend;
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dm_postsuspend_fn postsuspend;
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dm_preresume_fn preresume;
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dm_resume_fn resume;
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dm_status_fn status;
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dm_message_fn message;
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dm_ioctl_fn ioctl;
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dm_merge_fn merge;
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dm_busy_fn busy;
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dm_iterate_devices_fn iterate_devices;
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dm_io_hints_fn io_hints;
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/* For internal device-mapper use. */
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struct list_head list;
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};
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struct dm_target {
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struct dm_table *table;
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struct target_type *type;
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/* target limits */
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sector_t begin;
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sector_t len;
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/* Always a power of 2 */
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sector_t split_io;
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/*
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* A number of zero-length barrier requests that will be submitted
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* to the target for the purpose of flushing cache.
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*
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* The request number will be placed in union map_info->target_request_nr.
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* It is a responsibility of the target driver to remap these requests
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* to the real underlying devices.
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*/
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unsigned num_flush_requests;
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/*
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* The number of discard requests that will be submitted to the
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* target. map_info->request_nr is used just like num_flush_requests.
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*/
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unsigned num_discard_requests;
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/* target specific data */
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void *private;
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/* Used to provide an error string from the ctr */
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char *error;
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};
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/* Each target can link one of these into the table */
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struct dm_target_callbacks {
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struct list_head list;
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int (*congested_fn) (struct dm_target_callbacks *, int);
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};
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int dm_register_target(struct target_type *t);
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void dm_unregister_target(struct target_type *t);
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/*-----------------------------------------------------------------
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* Functions for creating and manipulating mapped devices.
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* Drop the reference with dm_put when you finish with the object.
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*---------------------------------------------------------------*/
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/*
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* DM_ANY_MINOR chooses the next available minor number.
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*/
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#define DM_ANY_MINOR (-1)
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int dm_create(int minor, struct mapped_device **md);
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/*
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* Reference counting for md.
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*/
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struct mapped_device *dm_get_md(dev_t dev);
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void dm_get(struct mapped_device *md);
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void dm_put(struct mapped_device *md);
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/*
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* An arbitrary pointer may be stored alongside a mapped device.
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*/
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void dm_set_mdptr(struct mapped_device *md, void *ptr);
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void *dm_get_mdptr(struct mapped_device *md);
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/*
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* A device can still be used while suspended, but I/O is deferred.
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*/
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int dm_suspend(struct mapped_device *md, unsigned suspend_flags);
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int dm_resume(struct mapped_device *md);
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/*
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* Event functions.
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*/
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uint32_t dm_get_event_nr(struct mapped_device *md);
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int dm_wait_event(struct mapped_device *md, int event_nr);
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uint32_t dm_next_uevent_seq(struct mapped_device *md);
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void dm_uevent_add(struct mapped_device *md, struct list_head *elist);
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/*
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* Info functions.
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*/
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const char *dm_device_name(struct mapped_device *md);
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int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
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struct gendisk *dm_disk(struct mapped_device *md);
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int dm_suspended(struct dm_target *ti);
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int dm_noflush_suspending(struct dm_target *ti);
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union map_info *dm_get_mapinfo(struct bio *bio);
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union map_info *dm_get_rq_mapinfo(struct request *rq);
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/*
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* Geometry functions.
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*/
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int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
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int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
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/*-----------------------------------------------------------------
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* Functions for manipulating device-mapper tables.
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*---------------------------------------------------------------*/
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/*
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* First create an empty table.
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*/
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int dm_table_create(struct dm_table **result, fmode_t mode,
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unsigned num_targets, struct mapped_device *md);
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/*
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* Then call this once for each target.
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*/
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int dm_table_add_target(struct dm_table *t, const char *type,
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sector_t start, sector_t len, char *params);
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/*
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* Target_ctr should call this if it needs to add any callbacks.
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*/
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void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb);
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/*
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* Finally call this to make the table ready for use.
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*/
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int dm_table_complete(struct dm_table *t);
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/*
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* Table reference counting.
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*/
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struct dm_table *dm_get_live_table(struct mapped_device *md);
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void dm_table_get(struct dm_table *t);
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void dm_table_put(struct dm_table *t);
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/*
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* Queries
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*/
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sector_t dm_table_get_size(struct dm_table *t);
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unsigned int dm_table_get_num_targets(struct dm_table *t);
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fmode_t dm_table_get_mode(struct dm_table *t);
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struct mapped_device *dm_table_get_md(struct dm_table *t);
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/*
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* Trigger an event.
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*/
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void dm_table_event(struct dm_table *t);
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/*
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* The device must be suspended before calling this method.
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* Returns the previous table, which the caller must destroy.
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*/
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struct dm_table *dm_swap_table(struct mapped_device *md,
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struct dm_table *t);
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/*
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* A wrapper around vmalloc.
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*/
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void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
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/*-----------------------------------------------------------------
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* Macros.
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*---------------------------------------------------------------*/
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#define DM_NAME "device-mapper"
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#define DMCRIT(f, arg...) \
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printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
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#define DMERR(f, arg...) \
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printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
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#define DMERR_LIMIT(f, arg...) \
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do { \
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if (printk_ratelimit()) \
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printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
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f "\n", ## arg); \
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} while (0)
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#define DMWARN(f, arg...) \
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printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
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#define DMWARN_LIMIT(f, arg...) \
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do { \
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if (printk_ratelimit()) \
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printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
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f "\n", ## arg); \
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} while (0)
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#define DMINFO(f, arg...) \
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printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
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#define DMINFO_LIMIT(f, arg...) \
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do { \
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if (printk_ratelimit()) \
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printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
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"\n", ## arg); \
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} while (0)
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#ifdef CONFIG_DM_DEBUG
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# define DMDEBUG(f, arg...) \
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printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
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# define DMDEBUG_LIMIT(f, arg...) \
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do { \
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if (printk_ratelimit()) \
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printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
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"\n", ## arg); \
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} while (0)
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#else
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# define DMDEBUG(f, arg...) do {} while (0)
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# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
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#endif
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#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
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0 : scnprintf(result + sz, maxlen - sz, x))
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#define SECTOR_SHIFT 9
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/*
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* Definitions of return values from target end_io function.
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*/
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#define DM_ENDIO_INCOMPLETE 1
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#define DM_ENDIO_REQUEUE 2
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/*
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* Definitions of return values from target map function.
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*/
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#define DM_MAPIO_SUBMITTED 0
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#define DM_MAPIO_REMAPPED 1
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#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
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/*
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* Ceiling(n / sz)
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*/
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#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
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#define dm_sector_div_up(n, sz) ( \
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{ \
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sector_t _r = ((n) + (sz) - 1); \
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sector_div(_r, (sz)); \
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_r; \
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} \
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)
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/*
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* ceiling(n / size) * size
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*/
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#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
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#define dm_array_too_big(fixed, obj, num) \
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((num) > (UINT_MAX - (fixed)) / (obj))
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/*
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* Sector offset taken relative to the start of the target instead of
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* relative to the start of the device.
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*/
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#define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
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static inline sector_t to_sector(unsigned long n)
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{
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return (n >> SECTOR_SHIFT);
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}
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static inline unsigned long to_bytes(sector_t n)
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{
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return (n << SECTOR_SHIFT);
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}
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/*-----------------------------------------------------------------
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* Helper for block layer and dm core operations
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*---------------------------------------------------------------*/
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void dm_dispatch_request(struct request *rq);
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void dm_requeue_unmapped_request(struct request *rq);
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void dm_kill_unmapped_request(struct request *rq, int error);
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int dm_underlying_device_busy(struct request_queue *q);
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#endif /* _LINUX_DEVICE_MAPPER_H */
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