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NetBSD/sys/dev/dm/dm.h

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/* $NetBSD: dm.h,v 1.14 2009/06/05 21:52:31 haad Exp $ */
/*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Hamsik.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DM_DEV_H_
#define _DM_DEV_H_
#ifdef _KERNEL
#include <sys/errno.h>
#include <sys/atomic.h>
#include <sys/condvar.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/disklabel.h>
#include <prop/proplib.h>
#define DM_MAX_TYPE_NAME 16
#define DM_NAME_LEN 128
#define DM_UUID_LEN 129
#define DM_VERSION_MAJOR 5
#define DM_VERSION_MINOR 13
#define DM_VERSION_PATCHLEVEL 0
/*** Internal device-mapper structures ***/
/*
* A table entry describes a physical range of the logical volume.
*/
#define MAX_TARGET_STRING_LEN 32
/*
* A device mapper table is a list of physical ranges plus the mapping target
* applied to them.
*/
typedef struct dm_table_entry {
struct dm_dev *dm_dev; /* backlink */
uint64_t start;
uint64_t length;
struct dm_target *target; /* Link to table target. */
void *target_config; /* Target specific data. */
SLIST_ENTRY(dm_table_entry) next;
} dm_table_entry_t;
SLIST_HEAD(dm_table, dm_table_entry);
typedef struct dm_table dm_table_t;
typedef struct dm_table_head {
/* Current active table is selected with this. */
int cur_active_table;
struct dm_table tables[2];
kmutex_t table_mtx;
kcondvar_t table_cv; /*IO waiting cv */
uint32_t io_cnt;
} dm_table_head_t;
#define MAX_DEV_NAME 32
/*
* This structure is used to store opened vnodes for disk with name.
* I need this because devices can be opened only once, but I can
* have more then one device on one partition.
*/
typedef struct dm_pdev {
char name[MAX_DEV_NAME];
struct vnode *pdev_vnode;
int ref_cnt; /* reference counter for users ofthis pdev */
SLIST_ENTRY(dm_pdev) next_pdev;
} dm_pdev_t;
/*
* This structure is called for every device-mapper device.
* It points to SLIST of device tables and mirrored, snapshoted etc. devices.
*/
TAILQ_HEAD(dm_dev_head, dm_dev) dm_devs;
typedef struct dm_dev {
char name[DM_NAME_LEN];
char uuid[DM_UUID_LEN];
uint64_t minor;
uint32_t flags; /* store communication protocol flags */
kmutex_t dev_mtx; /* mutex for generall device lock */
kcondvar_t dev_cv; /* cv for between ioctl synchronisation */
uint32_t event_nr;
uint32_t ref_cnt;
uint32_t dev_type;
dm_table_head_t table_head;
struct dm_dev_head upcalls;
struct disk *diskp;
TAILQ_ENTRY(dm_dev) next_upcall; /* LIST of mirrored, snapshoted devices. */
TAILQ_ENTRY(dm_dev) next_devlist; /* Major device list. */
} dm_dev_t;
/* Device types used for upcalls */
#define DM_ZERO_DEV (1 << 0)
#define DM_ERROR_DEV (1 << 1)
#define DM_LINEAR_DEV (1 << 2)
#define DM_MIRROR_DEV (1 << 3)
#define DM_STRIPE_DEV (1 << 4)
#define DM_SNAPSHOT_DEV (1 << 5)
#define DM_SNAPSHOT_ORIG_DEV (1 << 6)
#define DM_SPARE_DEV (1 << 7)
/* Set this device type only during dev remove ioctl. */
#define DM_DELETING_DEV (1 << 8)
/* for zero, error : dm_target->target_config == NULL */
/*
* Target config is initiated with target_init function.
*/
/* for linear : */
typedef struct target_linear_config {
dm_pdev_t *pdev;
uint64_t offset;
} dm_target_linear_config_t;
/* for stripe : */
typedef struct target_stripe_config {
#define MAX_STRIPES 2
struct target_linear_config stripe_devs[MAX_STRIPES];
uint8_t stripe_num;
uint64_t stripe_chunksize;
size_t params_len;
} dm_target_stripe_config_t;
/* for mirror : */
typedef struct target_mirror_config {
#define MAX_MIRROR_COPIES 4
dm_pdev_t *orig;
dm_pdev_t *copies[MAX_MIRROR_COPIES];
/* copied blocks bitmaps administration etc*/
dm_pdev_t *log_pdev; /* for administration */
uint64_t log_regionsize; /* blocksize of mirror */
/* list of parts that still need copied etc.; run length encoded? */
} dm_target_mirror_config_t;
/* for snapshot : */
typedef struct target_snapshot_config {
dm_pdev_t *tsc_snap_dev;
/* cow dev is set only for persistent snapshot devices */
dm_pdev_t *tsc_cow_dev;
uint64_t tsc_chunk_size;
uint32_t tsc_persistent_dev;
} dm_target_snapshot_config_t;
/* for snapshot-origin devices */
typedef struct target_snapshot_origin_config {
dm_pdev_t *tsoc_real_dev;
/* list of snapshots ? */
} dm_target_snapshot_origin_config_t;
/* constant dm_target structures for error, zero, linear, stripes etc. */
typedef struct dm_target {
char name[DM_MAX_TYPE_NAME];
/* Initialize target_config area */
int (*init)(dm_dev_t *, void **, prop_dictionary_t);
/* Destroy target_config area */
int (*destroy)(dm_table_entry_t *);
int (*deps) (dm_table_entry_t *, prop_array_t);
/*
* Status routine is called to get params string, which is target
* specific. When dm_table_status_ioctl is called with flag
* DM_STATUS_TABLE_FLAG I have to sent params string back.
*/
char * (*status)(void *);
int (*strategy)(dm_table_entry_t *, struct buf *);
int (*upcall)(dm_table_entry_t *, struct buf *);
uint32_t version[3];
int ref_cnt;
TAILQ_ENTRY(dm_target) dm_target_next;
} dm_target_t;
/* Interface structures */
/*
* This structure is used to translate command sent to kernel driver in
* <key>command</key>
* <value></value>
* to function which I can call.
*/
struct cmd_function {
const char *cmd;
int (*fn)(prop_dictionary_t);
};
/* device-mapper */
void dmgetproperties(struct disk *, dm_table_head_t *);
/* dm_ioctl.c */
int dm_dev_create_ioctl(prop_dictionary_t);
int dm_dev_list_ioctl(prop_dictionary_t);
int dm_dev_remove_ioctl(prop_dictionary_t);
int dm_dev_rename_ioctl(prop_dictionary_t);
int dm_dev_resume_ioctl(prop_dictionary_t);
int dm_dev_status_ioctl(prop_dictionary_t);
int dm_dev_suspend_ioctl(prop_dictionary_t);
int dm_check_version(prop_dictionary_t);
int dm_get_version_ioctl(prop_dictionary_t);
int dm_list_versions_ioctl(prop_dictionary_t);
int dm_table_clear_ioctl(prop_dictionary_t);
int dm_table_deps_ioctl(prop_dictionary_t);
int dm_table_load_ioctl(prop_dictionary_t);
int dm_table_status_ioctl(prop_dictionary_t);
/* dm_target.c */
dm_target_t* dm_target_alloc(const char *);
dm_target_t* dm_target_autoload(const char *);
int dm_target_destroy(void);
int dm_target_insert(dm_target_t *);
prop_array_t dm_target_prop_list(void);
dm_target_t* dm_target_lookup(const char *);
int dm_target_rem(char *);
void dm_target_unbusy(dm_target_t *);
void dm_target_busy(dm_target_t *);
/* XXX temporally add */
int dm_target_init(void);
#define DM_MAX_PARAMS_SIZE 1024
/* dm_target_zero.c */
int dm_target_zero_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_zero_status(void *);
int dm_target_zero_strategy(dm_table_entry_t *, struct buf *);
int dm_target_zero_destroy(dm_table_entry_t *);
int dm_target_zero_deps(dm_table_entry_t *, prop_array_t);
int dm_target_zero_upcall(dm_table_entry_t *, struct buf *);
/* dm_target_error.c */
int dm_target_error_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_error_status(void *);
int dm_target_error_strategy(dm_table_entry_t *, struct buf *);
int dm_target_error_deps(dm_table_entry_t *, prop_array_t);
int dm_target_error_destroy(dm_table_entry_t *);
int dm_target_error_upcall(dm_table_entry_t *, struct buf *);
/* dm_target_linear.c */
int dm_target_linear_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_linear_status(void *);
int dm_target_linear_strategy(dm_table_entry_t *, struct buf *);
int dm_target_linear_deps(dm_table_entry_t *, prop_array_t);
int dm_target_linear_destroy(dm_table_entry_t *);
int dm_target_linear_upcall(dm_table_entry_t *, struct buf *);
/* Generic function used to convert char to string */
uint64_t atoi(const char *);
/* dm_target_mirror.c */
int dm_target_mirror_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_mirror_status(void *);
int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *);
int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t);
int dm_target_mirror_destroy(dm_table_entry_t *);
int dm_target_mirror_upcall(dm_table_entry_t *, struct buf *);
/* dm_target_stripe.c */
int dm_target_stripe_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_stripe_status(void *);
int dm_target_stripe_strategy(dm_table_entry_t *, struct buf *);
int dm_target_stripe_deps(dm_table_entry_t *, prop_array_t);
int dm_target_stripe_destroy(dm_table_entry_t *);
int dm_target_stripe_upcall(dm_table_entry_t *, struct buf *);
/* dm_target_snapshot.c */
int dm_target_snapshot_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_snapshot_status(void *);
int dm_target_snapshot_strategy(dm_table_entry_t *, struct buf *);
int dm_target_snapshot_deps(dm_table_entry_t *, prop_array_t);
int dm_target_snapshot_destroy(dm_table_entry_t *);
int dm_target_snapshot_upcall(dm_table_entry_t *, struct buf *);
/* dm snapshot origin driver */
int dm_target_snapshot_orig_init(dm_dev_t *, void**, prop_dictionary_t);
char * dm_target_snapshot_orig_status(void *);
int dm_target_snapshot_orig_strategy(dm_table_entry_t *, struct buf *);
int dm_target_snapshot_orig_deps(dm_table_entry_t *, prop_array_t);
int dm_target_snapshot_orig_destroy(dm_table_entry_t *);
int dm_target_snapshot_orig_upcall(dm_table_entry_t *, struct buf *);
/* dm_table.c */
#define DM_TABLE_ACTIVE 0
#define DM_TABLE_INACTIVE 1
int dm_table_destroy(dm_table_head_t *, uint8_t);
uint64_t dm_table_size(dm_table_head_t *);
dm_table_t * dm_table_get_entry(dm_table_head_t *, uint8_t);
int dm_table_get_target_count(dm_table_head_t *, uint8_t);
void dm_table_release(dm_table_head_t *, uint8_t s);
void dm_table_switch_tables(dm_table_head_t *);
void dm_table_head_init(dm_table_head_t *);
void dm_table_head_destroy(dm_table_head_t *);
/* dm_dev.c */
dm_dev_t* dm_dev_alloc(void);
void dm_dev_busy(dm_dev_t *);
int dm_dev_destroy(void);
int dm_dev_free(dm_dev_t *);
int dm_dev_init(void);
int dm_dev_insert(dm_dev_t *);
dm_dev_t* dm_dev_lookup(const char *, const char *, int);
prop_array_t dm_dev_prop_list(void);
dm_dev_t* dm_dev_rem(const char *, const char *, int);
/*int dm_dev_test_minor(int);*/
void dm_dev_unbusy(dm_dev_t *);
/* dm_pdev.c */
int dm_pdev_decr(dm_pdev_t *);
int dm_pdev_destroy(void);
int dm_pdev_init(void);
dm_pdev_t* dm_pdev_insert(const char *);
#endif /*_KERNEL*/
#endif /*_DM_DEV_H_*/
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