/* $NetBSD: lvmcache.h,v 1.1.1.2 2009/12/02 00:26:21 haad Exp $ */ /* * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. * Copyright (C) 2004-2008 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 _LVM_CACHE_H #define _LVM_CACHE_H #include "dev-cache.h" #include "uuid.h" #include "label.h" #define ORPHAN_PREFIX "#" #define ORPHAN_VG_NAME(fmt) ORPHAN_PREFIX "orphans_" fmt #define CACHE_INVALID 0x00000001 #define CACHE_LOCKED 0x00000002 /* LVM specific per-volume info */ /* Eventual replacement for struct physical_volume perhaps? */ struct cmd_context; struct format_type; struct volume_group; /* One per VG */ struct lvmcache_vginfo { struct dm_list list; /* Join these vginfos together */ struct dm_list infos; /* List head for lvmcache_infos */ const struct format_type *fmt; char *vgname; /* "" == orphan */ uint32_t status; char vgid[ID_LEN + 1]; char _padding[7]; struct lvmcache_vginfo *next; /* Another VG with same name? */ char *creation_host; char *vgmetadata; /* Copy of VG metadata as format_text string */ unsigned precommitted; /* Is vgmetadata live or precommitted? */ }; /* One per device */ struct lvmcache_info { struct dm_list list; /* Join VG members together */ struct dm_list mdas; /* list head for metadata areas */ struct dm_list das; /* list head for data areas */ struct lvmcache_vginfo *vginfo; /* NULL == unknown */ struct label *label; const struct format_type *fmt; struct device *dev; uint64_t device_size; /* Bytes */ uint32_t status; }; int lvmcache_init(void); void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans); /* Set full_scan to 1 to reread every filtered device label or * 2 to rescan /dev for new devices */ int lvmcache_label_scan(struct cmd_context *cmd, int full_scan); /* Add/delete a device */ struct lvmcache_info *lvmcache_add(struct labeller *labeller, const char *pvid, struct device *dev, const char *vgname, const char *vgid, uint32_t vgstatus); int lvmcache_add_orphan_vginfo(const char *vgname, struct format_type *fmt); void lvmcache_del(struct lvmcache_info *info); /* Update things */ int lvmcache_update_vgname_and_id(struct lvmcache_info *info, const char *vgname, const char *vgid, uint32_t vgstatus, const char *hostname); int lvmcache_update_vg(struct volume_group *vg, unsigned precommitted); void lvmcache_lock_vgname(const char *vgname, int read_only); void lvmcache_unlock_vgname(const char *vgname); int lvmcache_verify_lock_order(const char *vgname); /* Queries */ const struct format_type *fmt_from_vgname(const char *vgname, const char *vgid); struct lvmcache_vginfo *vginfo_from_vgname(const char *vgname, const char *vgid); struct lvmcache_vginfo *vginfo_from_vgid(const char *vgid); struct lvmcache_info *info_from_pvid(const char *pvid, int valid_only); const char *vgname_from_vgid(struct dm_pool *mem, const char *vgid); struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid); int vgs_locked(void); int vgname_is_locked(const char *vgname); /* Returns list of struct str_lists containing pool-allocated copy of vgnames */ /* Set full_scan to 1 to reread every filtered device label */ struct dm_list *lvmcache_get_vgnames(struct cmd_context *cmd, int full_scan); /* Returns list of struct str_lists containing pool-allocated copy of vgids */ /* Set full_scan to 1 to reread every filtered device label */ struct dm_list *lvmcache_get_vgids(struct cmd_context *cmd, int full_scan); /* Returns list of struct str_lists containing pool-allocated copy of pvids */ struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname, const char *vgid); /* Returns cached volume group metadata. */ struct volume_group *lvmcache_get_vg(const char *vgid, unsigned precommitted); void lvmcache_drop_metadata(const char *vgname); #endif