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lvm2/lib/metadata/segtype.h
Jonathan Earl Brassow cac52ca4ce Add basic RAID segment type(s) support. 
Implementation described in doc/lvm2-raid.txt.

Basic support includes:
- ability to create RAID 1/4/5/6 arrays
- ability to delete RAID arrays
- ability to display RAID arrays
Notable missing features (not included in this patch):
- ability to clean-up/repair failures
- ability to convert RAID segment types
- ability to monitor RAID segment types
2011-08-02 22:07:20 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2010 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _SEGTYPES_H
#define _SEGTYPES_H
#include "metadata-exported.h"
struct segtype_handler;
struct cmd_context;
struct config_tree;
struct lv_segment;
struct lv_activate_opts;
struct formatter;
struct config_node;
struct dev_manager;
/* Feature flags */
#define SEG_CAN_SPLIT 0x00000001U
#define SEG_AREAS_STRIPED 0x00000002U
#define SEG_AREAS_MIRRORED 0x00000004U
#define SEG_SNAPSHOT 0x00000008U
#define SEG_FORMAT1_SUPPORT 0x00000010U
#define SEG_VIRTUAL 0x00000020U
#define SEG_CANNOT_BE_ZEROED 0x00000040U
#define SEG_MONITORED 0x00000080U
#define SEG_REPLICATOR 0x00000100U
#define SEG_REPLICATOR_DEV 0x00000200U
#define SEG_RAID 0x00000400U
#define SEG_UNKNOWN 0x80000000U
#define seg_is_mirrored(seg) ((seg)->segtype->flags & SEG_AREAS_MIRRORED ? 1 : 0)
#define seg_is_replicator(seg) ((seg)->segtype->flags & SEG_REPLICATOR ? 1 : 0)
#define seg_is_replicator_dev(seg) ((seg)->segtype->flags & SEG_REPLICATOR_DEV ? 1 : 0)
#define seg_is_striped(seg) ((seg)->segtype->flags & SEG_AREAS_STRIPED ? 1 : 0)
#define seg_is_snapshot(seg) ((seg)->segtype->flags & SEG_SNAPSHOT ? 1 : 0)
#define seg_is_virtual(seg) ((seg)->segtype->flags & SEG_VIRTUAL ? 1 : 0)
#define seg_is_raid(seg) ((seg)->segtype->flags & SEG_RAID ? 1 : 0)
#define seg_can_split(seg) ((seg)->segtype->flags & SEG_CAN_SPLIT ? 1 : 0)
#define seg_cannot_be_zeroed(seg) ((seg)->segtype->flags & SEG_CANNOT_BE_ZEROED ? 1 : 0)
#define seg_monitored(seg) ((seg)->segtype->flags & SEG_MONITORED ? 1 : 0)
#define seg_unknown(seg) ((seg)->segtype->flags & SEG_UNKNOWN ? 1 : 0)
#define segtype_is_striped(segtype) ((segtype)->flags & SEG_AREAS_STRIPED ? 1 : 0)
#define segtype_is_mirrored(segtype) ((segtype)->flags & SEG_AREAS_MIRRORED ? 1 : 0)
#define segtype_is_raid(segtype) ((segtype)->flags & SEG_RAID ? 1 : 0)
#define segtype_is_virtual(segtype) ((segtype)->flags & SEG_VIRTUAL ? 1 : 0)
struct segment_type {
struct dm_list list; /* Internal */
struct cmd_context *cmd; /* lvm_register_segtype() sets this. */
uint32_t flags;
uint32_t parity_devs; /* Parity drives required by segtype */
struct segtype_handler *ops;
const char *name;
void *library; /* lvm_register_segtype() sets this. */
void *private; /* For the segtype handler to use. */
};
struct segtype_handler {
const char *(*name) (const struct lv_segment * seg);
const char *(*target_name) (const struct lv_segment *seg,
const struct lv_activate_opts *laopts);
void (*display) (const struct lv_segment * seg);
int (*text_export) (const struct lv_segment * seg,
struct formatter * f);
int (*text_import_area_count) (const struct config_node * sn,
uint32_t *area_count);
int (*text_import) (struct lv_segment * seg,
const struct config_node * sn,
struct dm_hash_table * pv_hash);
int (*merge_segments) (struct lv_segment * seg1,
struct lv_segment * seg2);
int (*add_target_line) (struct dev_manager *dm, struct dm_pool *mem,
struct cmd_context *cmd, void **target_state,
struct lv_segment *seg,
const struct lv_activate_opts *laopts,
struct dm_tree_node *node, uint64_t len,
uint32_t *pvmove_mirror_count);
int (*target_status_compatible) (const char *type);
int (*check_transient_status) (struct lv_segment *seg, char *params);
int (*target_percent) (void **target_state,
percent_t *percent,
struct dm_pool * mem,
struct cmd_context *cmd,
struct lv_segment *seg, char *params,
uint64_t *total_numerator,
uint64_t *total_denominator);
int (*target_present) (struct cmd_context *cmd,
const struct lv_segment *seg,
unsigned *attributes);
int (*modules_needed) (struct dm_pool *mem,
const struct lv_segment *seg,
struct dm_list *modules);
void (*destroy) (struct segment_type * segtype);
int (*target_monitored) (struct lv_segment *seg, int *pending);
int (*target_monitor_events) (struct lv_segment *seg, int events);
int (*target_unmonitor_events) (struct lv_segment *seg, int events);
};
struct segment_type *get_segtype_from_string(struct cmd_context *cmd,
const char *str);
struct segtype_library;
int lvm_register_segtype(struct segtype_library *seglib,
struct segment_type *segtype);
struct segment_type *init_striped_segtype(struct cmd_context *cmd);
struct segment_type *init_zero_segtype(struct cmd_context *cmd);
struct segment_type *init_error_segtype(struct cmd_context *cmd);
struct segment_type *init_free_segtype(struct cmd_context *cmd);
struct segment_type *init_unknown_segtype(struct cmd_context *cmd,
const char *name);
#ifdef RAID_INTERNAL
struct segment_type *init_raid1_segtype(struct cmd_context *cmd);
struct segment_type *init_raid4_segtype(struct cmd_context *cmd);
struct segment_type *init_raid5_segtype(struct cmd_context *cmd);
struct segment_type *init_raid5_la_segtype(struct cmd_context *cmd);
struct segment_type *init_raid5_ra_segtype(struct cmd_context *cmd);
struct segment_type *init_raid5_ls_segtype(struct cmd_context *cmd);
struct segment_type *init_raid5_rs_segtype(struct cmd_context *cmd);
struct segment_type *init_raid6_segtype(struct cmd_context *cmd);
struct segment_type *init_raid6_zr_segtype(struct cmd_context *cmd);
struct segment_type *init_raid6_nr_segtype(struct cmd_context *cmd);
struct segment_type *init_raid6_nc_segtype(struct cmd_context *cmd);
#endif
#ifdef REPLICATOR_INTERNAL
int init_replicator_segtype(struct segtype_library *seglib);
#endif
#ifdef SNAPSHOT_INTERNAL
struct segment_type *init_snapshot_segtype(struct cmd_context *cmd);
#endif
#ifdef MIRRORED_INTERNAL
struct segment_type *init_mirrored_segtype(struct cmd_context *cmd);
#endif
#ifdef CRYPT_INTERNAL
struct segment_type *init_crypt_segtype(struct cmd_context *cmd);
#endif
#endif
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