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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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123d87d553
Currently, if we pass too high sector number to dm_table_find_target, it returns zeroed dm_target structure and callers test if the structure is zeroed with the macro dm_target_is_valid. However, returning NULL is common practice to indicate errors. This patch refactors the dm code, so that dm_table_find_target returns NULL and its callers test the returned value for NULL. The macro dm_target_is_valid is deleted. In alloc_targets, we no longer allocate an extra zeroed target. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
216 lines
6.6 KiB
C
216 lines
6.6 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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/*-----------------------------------------------------------------
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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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void 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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int dm_table_any_congested(struct dm_table *t, int bdi_bits);
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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_supports_dax(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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* 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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sector_t dm_get_size(struct mapped_device *md);
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struct request_queue *dm_get_md_queue(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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struct dm_stats *dm_get_stats(struct mapped_device *md);
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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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