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For zoned targets that cannot support zone append operations, implement an emulation using regular write operations. If the original BIO submitted by the user is a zone append operation, change its clone into a regular write operation directed at the target zone write pointer position. To do so, an array of write pointer offsets (write pointer position relative to the start of a zone) is added to struct mapped_device. All operations that modify a sequential zone write pointer (writes, zone reset, zone finish and zone append) are intersepted in __map_bio() and processed using the new functions dm_zone_map_bio(). Detection of the target ability to natively support zone append operations is done from dm_table_set_restrictions() by calling the function dm_set_zones_restrictions(). A target that does not support zone append operation, either by explicitly declaring it using the new struct dm_target field zone_append_not_supported, or because the device table contains a non-zoned device, has its mapped device marked with the new flag DMF_ZONE_APPEND_EMULATED. The helper function dm_emulate_zone_append() is introduced to test a mapped device for this new flag. Atomicity of the zones write pointer tracking and updates is done using a zone write locking mechanism based on a bitmap. This is similar to the block layer method but based on BIOs rather than struct request. A zone write lock is taken in dm_zone_map_bio() for any clone BIO with an operation type that changes the BIO target zone write pointer position. The zone write lock is released if the clone BIO is failed before submission or when dm_zone_endio() is called when the clone BIO completes. The zone write lock bitmap of the mapped device, together with a bitmap indicating zone types (conv_zones_bitmap) and the write pointer offset array (zwp_offset) are allocated and initialized with a full device zone report in dm_set_zones_restrictions() using the function dm_revalidate_zones(). For failed operations that may have modified a zone write pointer, the zone write pointer offset is marked as invalid in dm_zone_endio(). Zones with an invalid write pointer offset are checked and the write pointer updated using an internal report zone operation when the faulty zone is accessed again by the user. All functions added for this emulation have a minimal overhead for zoned targets natively supporting zone append operations. Regular device targets are also not affected. The added code also does not impact builds with CONFIG_BLK_DEV_ZONED disabled by stubbing out all dm zone related functions. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
237 lines
7.2 KiB
C
237 lines
7.2 KiB
C
/*
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* Internal header file for device mapper
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*
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* Copyright (C) 2001, 2002 Sistina Software
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* Copyright (C) 2004-2006 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_INTERNAL_H
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#define DM_INTERNAL_H
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#include <linux/fs.h>
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#include <linux/device-mapper.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/hdreg.h>
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#include <linux/completion.h>
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#include <linux/kobject.h>
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#include <linux/refcount.h>
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#include "dm-stats.h"
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/*
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* Suspend feature flags
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*/
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#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
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#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
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/*
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* Status feature flags
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*/
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#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
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/*
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* List of devices that a metadevice uses and should open/close.
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*/
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struct dm_dev_internal {
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struct list_head list;
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refcount_t count;
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struct dm_dev *dm_dev;
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};
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struct dm_table;
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struct dm_md_mempools;
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struct dm_target_io;
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struct dm_io;
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/*-----------------------------------------------------------------
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* Internal table functions.
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*---------------------------------------------------------------*/
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void dm_table_event_callback(struct dm_table *t,
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void (*fn)(void *), void *context);
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struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
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struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
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bool dm_table_has_no_data_devices(struct dm_table *table);
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int dm_calculate_queue_limits(struct dm_table *table,
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struct queue_limits *limits);
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int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
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struct queue_limits *limits);
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struct list_head *dm_table_get_devices(struct dm_table *t);
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void dm_table_presuspend_targets(struct dm_table *t);
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void dm_table_presuspend_undo_targets(struct dm_table *t);
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void dm_table_postsuspend_targets(struct dm_table *t);
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int dm_table_resume_targets(struct dm_table *t);
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enum dm_queue_mode dm_table_get_type(struct dm_table *t);
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struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
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struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
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struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
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bool dm_table_bio_based(struct dm_table *t);
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bool dm_table_request_based(struct dm_table *t);
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void dm_table_free_md_mempools(struct dm_table *t);
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struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
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bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
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int *blocksize);
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int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
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sector_t start, sector_t len, void *data);
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void dm_lock_md_type(struct mapped_device *md);
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void dm_unlock_md_type(struct mapped_device *md);
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void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
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enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
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struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
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int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
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/*
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* To check whether the target type is bio-based or not (request-based).
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*/
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#define dm_target_bio_based(t) ((t)->type->map != NULL)
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/*
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* To check whether the target type is request-based or not (bio-based).
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*/
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#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
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/*
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* To check whether the target type is a hybrid (capable of being
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* either request-based or bio-based).
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*/
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#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
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/*
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* Zoned targets related functions.
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*/
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int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
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void dm_zone_endio(struct dm_io *io, struct bio *clone);
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#ifdef CONFIG_BLK_DEV_ZONED
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void dm_cleanup_zoned_dev(struct mapped_device *md);
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int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
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unsigned int nr_zones, report_zones_cb cb, void *data);
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bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
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int dm_zone_map_bio(struct dm_target_io *io);
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#else
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static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
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#define dm_blk_report_zones NULL
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static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
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{
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return false;
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}
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static inline int dm_zone_map_bio(struct dm_target_io *tio)
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{
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return DM_MAPIO_KILL;
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}
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#endif
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/*-----------------------------------------------------------------
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* A registry of target types.
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*---------------------------------------------------------------*/
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int dm_target_init(void);
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void dm_target_exit(void);
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struct target_type *dm_get_target_type(const char *name);
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void dm_put_target_type(struct target_type *tt);
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int dm_target_iterate(void (*iter_func)(struct target_type *tt,
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void *param), void *param);
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int dm_split_args(int *argc, char ***argvp, char *input);
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/*
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* Is this mapped_device being deleted?
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*/
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int dm_deleting_md(struct mapped_device *md);
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/*
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* Is this mapped_device suspended?
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*/
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int dm_suspended_md(struct mapped_device *md);
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/*
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* Internal suspend and resume methods.
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*/
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int dm_suspended_internally_md(struct mapped_device *md);
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void dm_internal_suspend_fast(struct mapped_device *md);
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void dm_internal_resume_fast(struct mapped_device *md);
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void dm_internal_suspend_noflush(struct mapped_device *md);
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void dm_internal_resume(struct mapped_device *md);
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/*
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* Test if the device is scheduled for deferred remove.
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*/
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int dm_test_deferred_remove_flag(struct mapped_device *md);
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/*
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* Try to remove devices marked for deferred removal.
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*/
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void dm_deferred_remove(void);
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/*
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* The device-mapper can be driven through one of two interfaces;
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* ioctl or filesystem, depending which patch you have applied.
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*/
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int dm_interface_init(void);
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void dm_interface_exit(void);
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/*
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* sysfs interface
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*/
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int dm_sysfs_init(struct mapped_device *md);
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void dm_sysfs_exit(struct mapped_device *md);
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struct kobject *dm_kobject(struct mapped_device *md);
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struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
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/*
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* The kobject helper
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*/
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void dm_kobject_release(struct kobject *kobj);
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/*
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* Targets for linear and striped mappings
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*/
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int dm_linear_init(void);
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void dm_linear_exit(void);
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int dm_stripe_init(void);
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void dm_stripe_exit(void);
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/*
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* mapped_device operations
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*/
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void dm_destroy(struct mapped_device *md);
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void dm_destroy_immediate(struct mapped_device *md);
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int dm_open_count(struct mapped_device *md);
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int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
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int dm_cancel_deferred_remove(struct mapped_device *md);
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int dm_request_based(struct mapped_device *md);
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int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
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struct dm_dev **result);
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void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
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int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
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unsigned cookie);
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void dm_internal_suspend(struct mapped_device *md);
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void dm_internal_resume(struct mapped_device *md);
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int dm_io_init(void);
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void dm_io_exit(void);
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int dm_kcopyd_init(void);
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void dm_kcopyd_exit(void);
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/*
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* Mempool operations
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*/
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struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
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unsigned integrity, unsigned per_bio_data_size,
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unsigned min_pool_size);
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void dm_free_md_mempools(struct dm_md_mempools *pools);
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/*
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* Various helpers
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*/
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unsigned dm_get_reserved_bio_based_ios(void);
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#endif
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