external/gpl2/lvm2/dist/lib/cache/lvmcache.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef _LVM_CACHE_H
  19 #define _LVM_CACHE_H
  20
  21 #include "dev-cache.h"
  22 #include "uuid.h"
  23 #include "label.h"
  24
  25 #define ORPHAN_PREFIX "#"
  26 #define ORPHAN_VG_NAME(fmt) ORPHAN_PREFIX "orphans_" fmt
  27
  28 #define CACHE_INVALID   0x00000001
  29 #define CACHE_LOCKED    0x00000002
  30
  31 /* LVM specific per-volume info */
  32 /* Eventual replacement for struct physical_volume perhaps? */
  33
  34 struct cmd_context;
  35 struct format_type;
  36 struct volume_group;
  37
  38 /* One per VG */
  39 struct lvmcache_vginfo {
  40         struct dm_list list;    /* Join these vginfos together */
  41         struct dm_list infos;   /* List head for lvmcache_infos */
  42         const struct format_type *fmt;
  43         char *vgname;           /* "" == orphan */
  44         uint32_t status;
  45         char vgid[ID_LEN + 1];
  46         char _padding[7];
  47         struct lvmcache_vginfo *next; /* Another VG with same name? */
  48         char *creation_host;
  49         char *vgmetadata;       /* Copy of VG metadata as format_text string */
  50         unsigned precommitted;  /* Is vgmetadata live or precommitted? */
  51 };
  52
  53 /* One per device */
  54 struct lvmcache_info {
  55         struct dm_list list;    /* Join VG members together */
  56         struct dm_list mdas;    /* list head for metadata areas */
  57         struct dm_list das;     /* list head for data areas */
  58         struct lvmcache_vginfo *vginfo; /* NULL == unknown */
  59         struct label *label;
  60         const struct format_type *fmt;
  61         struct device *dev;
  62         uint64_t device_size;   /* Bytes */
  63         uint32_t status;
  64 };
  65
  66 int lvmcache_init(void);
  67 void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans);
  68
  69 /* Set full_scan to 1 to reread every filtered device label or
  70  * 2 to rescan /dev for new devices */
  71 int lvmcache_label_scan(struct cmd_context *cmd, int full_scan);
  72
  73 /* Add/delete a device */
  74 struct lvmcache_info *lvmcache_add(struct labeller *labeller, const char *pvid,
  75                                    struct device *dev,
  76                                    const char *vgname, const char *vgid,
  77                                    uint32_t vgstatus);
  78 int lvmcache_add_orphan_vginfo(const char *vgname, struct format_type *fmt);
  79 void lvmcache_del(struct lvmcache_info *info);
  80
  81 /* Update things */
  82 int lvmcache_update_vgname_and_id(struct lvmcache_info *info,
  83                                   const char *vgname, const char *vgid,
  84                                   uint32_t vgstatus, const char *hostname);
  85 int lvmcache_update_vg(struct volume_group *vg, unsigned precommitted);
  86
  87 void lvmcache_lock_vgname(const char *vgname, int read_only);
  88 void lvmcache_unlock_vgname(const char *vgname);
  89 int lvmcache_verify_lock_order(const char *vgname);
  90
  91 /* Queries */
  92 const struct format_type *fmt_from_vgname(const char *vgname, const char *vgid);
  93 struct lvmcache_vginfo *vginfo_from_vgname(const char *vgname,
  94                                            const char *vgid);
  95 struct lvmcache_vginfo *vginfo_from_vgid(const char *vgid);
  96 struct lvmcache_info *info_from_pvid(const char *pvid, int valid_only);
  97 const char *vgname_from_vgid(struct dm_pool *mem, const char *vgid);
  98 struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid);
  99 int vgs_locked(void);
 100 int vgname_is_locked(const char *vgname);
 101
 102 /* Returns list of struct str_lists containing pool-allocated copy of vgnames */
 103 /* Set full_scan to 1 to reread every filtered device label */
 104 struct dm_list *lvmcache_get_vgnames(struct cmd_context *cmd, int full_scan);
 105
 106 /* Returns list of struct str_lists containing pool-allocated copy of vgids */
 107 /* Set full_scan to 1 to reread every filtered device label */
 108 struct dm_list *lvmcache_get_vgids(struct cmd_context *cmd, int full_scan);
 109
 110 /* Returns list of struct str_lists containing pool-allocated copy of pvids */
 111 struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname,
 112                                 const char *vgid);
 113
 114 /* Returns cached volume group metadata. */
 115 struct volume_group *lvmcache_get_vg(const char *vgid, unsigned precommitted);
 116 void lvmcache_drop_metadata(const char *vgname);
 117
 118 #endif