http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/device-mapper.h

/* * Copyright (C) 2001 Sistina Software (UK) Limited. * Copyright (C) 2004 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ #ifndef _LINUX_DEVICE_MAPPER_H #define _LINUX_DEVICE_MAPPER_H struct dm_target; struct dm_table; struct dm_dev; typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; union map_info { void *ptr; unsigned long long ll; }; /* * In the constructor the target parameter will already have the * table, type, begin and len fields filled in. */ typedef int (*dm_ctr_fn) (struct dm_target *target, unsigned int argc, char **argv); /* * The destructor doesn't need to free the dm_target, just * anything hidden ti->private. */ typedef void (*dm_dtr_fn) (struct dm_target *ti); /* * The map function must return: * < 0: error * = 0: The target will handle the io by resubmitting it later * > 0: simple remap complete */ typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio, union map_info *map_context); /* * Returns: * < 0 : error (currently ignored) * 0 : ended successfully * 1 : for some reason the io has still not completed (eg, * multipath target might want to requeue a failed io). */ typedef int (*dm_endio_fn) (struct dm_target *ti, struct bio *bio, int error, union map_info *map_context); typedef void (*dm_presuspend_fn) (struct dm_target *ti); typedef void (*dm_postsuspend_fn) (struct dm_target *ti); typedef void (*dm_resume_fn) (struct dm_target *ti); typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type, char *result, unsigned int maxlen); typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv); void dm_error(const char *message); /* * Constructors should call these functions to ensure destination devices * are opened/closed correctly. * FIXME: too many arguments. */ int dm_get_device(struct dm_target *ti, const char *path, sector_t start, sector_t len, int mode, struct dm_dev **result); void dm_put_device(struct dm_target *ti, struct dm_dev *d); /* * Information about a target type */ struct target_type { const char *name; struct module *module; unsigned version[3]; dm_ctr_fn ctr; dm_dtr_fn dtr; dm_map_fn map; dm_endio_fn end_io; dm_presuspend_fn presuspend; dm_postsuspend_fn postsuspend; dm_resume_fn resume; dm_status_fn status; dm_message_fn message; }; struct io_restrictions { unsigned int max_sectors; unsigned short max_phys_segments; unsigned short max_hw_segments; unsigned short hardsect_size; unsigned int max_segment_size; unsigned long seg_boundary_mask; }; struct dm_target { struct dm_table *table; struct target_type *type; /* target limits */ sector_t begin; sector_t len; /* FIXME: turn this into a mask, and merge with io_restrictions */ /* Always a power of 2 */ sector_t split_io; /* * These are automatically filled in by * dm_table_get_device. */ struct io_restrictions limits; /* target specific data */ void *private; /* Used to provide an error string from the ctr */ char *error; }; int dm_register_target(struct target_type *t); int dm_unregister_target(struct target_type *t); #endif /* _LINUX_DEVICE_MAPPER_H */