/* * Internal header file for device mapper * * Copyright (C) 2001, 2002 Sistina Software * Copyright (C) 2004 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ #ifndef DM_INTERNAL_H #define DM_INTERNAL_H #include <linux/fs.h> #include <linux/device-mapper.h> #include <linux/list.h> #include <linux/blkdev.h> #define DM_NAME "device-mapper" #define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x) #define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x) #define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x) #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ 0 : scnprintf(result + sz, maxlen - sz, x)) /* * FIXME: I think this should be with the definition of sector_t * in types.h. */ #ifdef CONFIG_LBD #define SECTOR_FORMAT "%Lu" #else #define SECTOR_FORMAT "%lu" #endif #define SECTOR_SHIFT 9 /* * List of devices that a metadevice uses and should open/close. */ struct dm_dev { struct list_head list; atomic_t count; int mode; struct block_device *bdev; char name[16]; }; struct dm_table; struct mapped_device; /*----------------------------------------------------------------- * Functions for manipulating a struct mapped_device. * Drop the reference with dm_put when you finish with the object. *---------------------------------------------------------------*/ int dm_create(struct mapped_device **md); int dm_create_with_minor(unsigned int minor, struct mapped_device **md); void dm_set_mdptr(struct mapped_device *md, void *ptr); void *dm_get_mdptr(dev_t dev); /* * Reference counting for md. */ void dm_get(struct mapped_device *md); void dm_put(struct mapped_device *md); /* * A device can still be used while suspended, but I/O is deferred. */ int dm_suspend(struct mapped_device *md); int dm_resume(struct mapped_device *md); /* * The device must be suspended before calling this method. */ int dm_swap_table(struct mapped_device *md, struct dm_table *t); /* * Drop a reference on the table when you've finished with the * result. */ struct dm_table *dm_get_table(struct mapped_device *md); /* * Event functions. */ uint32_t dm_get_event_nr(struct mapped_device *md); int dm_wait_event(struct mapped_device *md, int event_nr); /* * Info functions. */ struct gendisk *dm_disk(struct mapped_device *md); int dm_suspended(struct mapped_device *md); /*----------------------------------------------------------------- * Functions for manipulating a table. Tables are also reference * counted. *---------------------------------------------------------------*/ int dm_table_create(struct dm_table **result, int mode, unsigned num_targets); void dm_table_get(struct dm_table *t); void dm_table_put(struct dm_table *t); int dm_table_add_target(struct dm_table *t, const char *type, sector_t start, sector_t len, char *params); int dm_table_complete(struct dm_table *t); void dm_table_event_callback(struct dm_table *t, void (*fn)(void *), void *context); void dm_table_event(struct dm_table *t); sector_t dm_table_get_size(struct dm_table *t); struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); unsigned int dm_table_get_num_targets(struct dm_table *t); struct list_head *dm_table_get_devices(struct dm_table *t); int dm_table_get_mode(struct dm_table *t); void dm_table_presuspend_targets(struct dm_table *t); void dm_table_postsuspend_targets(struct dm_table *t); void dm_table_resume_targets(struct dm_table *t); int dm_table_any_congested(struct dm_table *t, int bdi_bits); void dm_table_unplug_all(struct dm_table *t); int dm_table_flush_all(struct dm_table *t); /*----------------------------------------------------------------- * A registry of target types. *---------------------------------------------------------------*/ int dm_target_init(void); void dm_target_exit(void); struct target_type *dm_get_target_type(const char *name); void dm_put_target_type(struct target_type *t); int dm_target_iterate(void (*iter_func)(struct target_type *tt, void *param), void *param); /*----------------------------------------------------------------- * Useful inlines. *---------------------------------------------------------------*/ static inline int array_too_big(unsigned long fixed, unsigned long obj, unsigned long num) { return (num > (ULONG_MAX - fixed) / obj); } /* * Ceiling(n / sz) */ #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) #define dm_sector_div_up(n, sz) ( \ { \ sector_t _r = ((n) + (sz) - 1); \ sector_div(_r, (sz)); \ _r; \ } \ ) /* * ceiling(n / size) * size */ #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) static inline sector_t to_sector(unsigned long n) { return (n >> 9); } static inline unsigned long to_bytes(sector_t n) { return (n << 9); } int dm_split_args(int *argc, char ***argvp, char *input); /* * The device-mapper can be driven through one of two interfaces; * ioctl or filesystem, depending which patch you have applied. */ int dm_interface_init(void); void dm_interface_exit(void); /* * Targets for linear and striped mappings */ int dm_linear_init(void); void dm_linear_exit(void); int dm_stripe_init(void); void dm_stripe_exit(void); void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); union map_info *dm_get_mapinfo(struct bio *bio); #endif