197 lines
5.4 KiB
C
197 lines
5.4 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 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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#define DM_NAME "device-mapper"
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#define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x)
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#define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x)
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#define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x)
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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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/*
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* FIXME: I think this should be with the definition of sector_t
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* in types.h.
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*/
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#ifdef CONFIG_LBD
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#define SECTOR_FORMAT "%llu"
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#else
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#define SECTOR_FORMAT "%lu"
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#endif
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#define SECTOR_SHIFT 9
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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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struct mapped_device;
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/*-----------------------------------------------------------------
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* Functions for manipulating a struct mapped_device.
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* Drop the reference with dm_put when you finish with the object.
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*---------------------------------------------------------------*/
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int dm_create(struct mapped_device **md);
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int dm_create_with_minor(unsigned int minor, struct mapped_device **md);
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void dm_set_mdptr(struct mapped_device *md, void *ptr);
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void *dm_get_mdptr(dev_t dev);
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struct mapped_device *dm_get_md(dev_t dev);
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/*
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* Reference counting for md.
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*/
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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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* 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, int with_lockfs);
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int dm_resume(struct mapped_device *md);
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/*
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* The device must be suspended before calling this method.
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*/
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int dm_swap_table(struct mapped_device *md, struct dm_table *t);
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/*
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* Drop a reference on the table when you've finished with the
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* result.
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*/
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struct dm_table *dm_get_table(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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/*
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* Info functions.
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*/
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struct gendisk *dm_disk(struct mapped_device *md);
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int dm_suspended(struct mapped_device *md);
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/*-----------------------------------------------------------------
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* Functions for manipulating a table. Tables are also reference
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* counted.
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*---------------------------------------------------------------*/
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int dm_table_create(struct dm_table **result, int mode, unsigned num_targets);
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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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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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int dm_table_complete(struct dm_table *t);
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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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void dm_table_event(struct dm_table *t);
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sector_t dm_table_get_size(struct dm_table *t);
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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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unsigned int dm_table_get_num_targets(struct dm_table *t);
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struct list_head *dm_table_get_devices(struct dm_table *t);
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int dm_table_get_mode(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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void 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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int dm_table_flush_all(struct dm_table *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 *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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/*
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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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static inline sector_t to_sector(unsigned long n)
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{
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return (n >> 9);
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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 << 9);
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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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#endif
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