/* $NetBSD: dm.h,v 1.27 2014/10/02 21:58:16 justin 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 #include #include #include #include #include #include #include #include #include #include #include /* for v_rdev */ #include #define DM_MAX_TYPE_NAME 16 #define DM_NAME_LEN 128 #define DM_UUID_LEN 129 #define DM_VERSION_MAJOR 4 #define DM_VERSION_MINOR 16 #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 than one device on one partition. */ typedef struct dm_pdev { char name[MAX_DEV_NAME]; struct vnode *pdev_vnode; uint64_t pdev_numsec; unsigned pdev_secsize; 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); //extern struct dm_dev_head dm_devs; typedef struct dm_dev { char name[DM_NAME_LEN]; char uuid[DM_UUID_LEN]; device_t devt; /* pointer to autoconf device_t structure */ uint64_t minor; /* Device minor number */ 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; kmutex_t diskp_mtx; 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; TAILQ_ENTRY(target_linear_config) entries; } dm_target_linear_config_t; /* * Striping devices are stored in a linked list, this might be inefficient * for more than 8 striping devices and can be changed to something more * scalable. * TODO: look for other options than linked list. */ TAILQ_HEAD(target_linear_devs, target_linear_config); typedef struct target_linear_devs dm_target_linear_devs_t; /* for stripe : */ typedef struct target_stripe_config { #define DM_STRIPE_DEV_OFFSET 2 struct target_linear_devs stripe_devs; 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 **, char *); /* 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 (*sync)(dm_table_entry_t *); int (*upcall)(dm_table_entry_t *, struct buf *); int (*secsize)(dm_table_entry_t *, unsigned *); uint32_t version[3]; uint32_t 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 * command * * to function which I can call, and if the command is allowed for * non-superusers. */ struct cmd_function { const char *cmd; int (*fn)(prop_dictionary_t); int allowed; }; /* 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_linear.c */ int dm_target_linear_init(dm_dev_t *, void**, char *); char * dm_target_linear_status(void *); int dm_target_linear_strategy(dm_table_entry_t *, struct buf *); int dm_target_linear_sync(dm_table_entry_t *); 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 *); int dm_target_linear_secsize(dm_table_entry_t *, unsigned *); /* Generic function used to convert char to string */ uint64_t atoi(const char *); /* dm_target_stripe.c */ int dm_target_stripe_init(dm_dev_t *, void**, char *); char * dm_target_stripe_status(void *); int dm_target_stripe_strategy(dm_table_entry_t *, struct buf *); int dm_target_stripe_sync(dm_table_entry_t *); 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 *); int dm_target_stripe_secsize(dm_table_entry_t *, unsigned *); /* 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 *); uint64_t dm_inactive_table_size(dm_table_head_t *); void dm_table_disksize(dm_table_head_t *, uint64_t *, unsigned *); 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); dm_dev_t* dm_dev_detach(device_t); 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_*/