107 lines
3.0 KiB
C
107 lines
3.0 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/blkdev.h>
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#include <linux/hdreg.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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* List of devices that a metadevice uses and should open/close.
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*/
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struct dm_dev {
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struct list_head list;
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atomic_t count;
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int mode;
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struct block_device *bdev;
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char name[16];
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};
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struct dm_table;
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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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void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
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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_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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void dm_table_unplug_all(struct dm_table *t);
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/*
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* To check the return value from dm_table_find_target().
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*/
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#define dm_target_is_valid(t) ((t)->table)
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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 *t);
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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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/*-----------------------------------------------------------------
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* Useful inlines.
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*---------------------------------------------------------------*/
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static inline int array_too_big(unsigned long fixed, unsigned long obj,
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unsigned long num)
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{
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return (num > (ULONG_MAX - fixed) / obj);
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}
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int dm_split_args(int *argc, char ***argvp, char *input);
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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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* 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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void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
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union map_info *dm_get_mapinfo(struct bio *bio);
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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);
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void dm_kobject_uevent(struct mapped_device *md);
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int dm_kcopyd_init(void);
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void dm_kcopyd_exit(void);
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#endif
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