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252 lines
10 KiB
C
252 lines
10 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _LVM_CACHE_H
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#define _LVM_CACHE_H
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#include "lib/device/dev-cache.h"
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#include "lib/device/dev-type.h"
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#include "lib/uuid/uuid.h"
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#include "lib/label/label.h"
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#include "lib/locking/locking.h"
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#define ORPHAN_PREFIX VG_ORPHANS
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#define ORPHAN_VG_NAME(fmt) ORPHAN_PREFIX "_" fmt
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/* LVM specific per-volume info */
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/* Eventual replacement for struct physical_volume perhaps? */
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struct cmd_context;
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struct format_type;
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struct volume_group;
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struct physical_volume;
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struct dm_config_tree;
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struct format_instance;
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struct metadata_area;
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struct disk_locn;
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struct lvmcache_vginfo;
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/*
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* vgsummary represents a summary of the VG that is read
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* without a lock. The info does not come through vg_read(),
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* but through reading mdas. It provides information about
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* the VG that is needed to lock the VG and then read it fully
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* with vg_read(), after which the VG summary should be checked
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* against the full VG metadata to verify it was correct (since
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* it was read without a lock.)
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*
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* Once read, vgsummary information is saved in lvmcache_vginfo.
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*/
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struct lvmcache_vgsummary {
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const char *vgname;
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struct id vgid;
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uint64_t vgstatus;
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char *creation_host;
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const char *system_id;
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const char *lock_type;
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uint32_t seqno;
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uint32_t mda_checksum;
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size_t mda_size;
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int mda_num; /* 1 = summary from mda1, 2 = summary from mda2 */
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unsigned mda_ignored:1;
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unsigned zero_offset:1;
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};
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int lvmcache_init(struct cmd_context *cmd);
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void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans, int reset);
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int lvmcache_label_scan(struct cmd_context *cmd);
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int lvmcache_label_rescan_vg(struct cmd_context *cmd, const char *vgname, const char *vgid);
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/* Add/delete a device */
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struct lvmcache_info *lvmcache_add(struct labeller *labeller, const char *pvid,
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struct device *dev,
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const char *vgname, const char *vgid,
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uint32_t vgstatus);
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int lvmcache_add_orphan_vginfo(const char *vgname, struct format_type *fmt);
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void lvmcache_del(struct lvmcache_info *info);
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void lvmcache_del_dev(struct device *dev);
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/* Update things */
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int lvmcache_update_vgname_and_id(struct lvmcache_info *info,
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struct lvmcache_vgsummary *vgsummary);
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int lvmcache_update_vg(struct volume_group *vg, unsigned precommitted);
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void lvmcache_lock_vgname(const char *vgname, int read_only);
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void lvmcache_unlock_vgname(const char *vgname);
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/* Queries */
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const struct format_type *lvmcache_fmt_from_vgname(struct cmd_context *cmd, const char *vgname, const char *vgid, unsigned revalidate_labels);
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int lvmcache_lookup_mda(struct lvmcache_vgsummary *vgsummary);
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/* Decrement and test if there are still vg holders in vginfo. */
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int lvmcache_vginfo_holders_dec_and_test_for_zero(struct lvmcache_vginfo *vginfo);
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struct lvmcache_vginfo *lvmcache_vginfo_from_vgname(const char *vgname,
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const char *vgid);
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struct lvmcache_vginfo *lvmcache_vginfo_from_vgid(const char *vgid);
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struct lvmcache_info *lvmcache_info_from_pvid(const char *pvid, struct device *dev, int valid_only);
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const char *lvmcache_vgname_from_vgid(struct dm_pool *mem, const char *vgid);
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const char *lvmcache_vgid_from_vgname(struct cmd_context *cmd, const char *vgname);
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struct device *lvmcache_device_from_pvid(struct cmd_context *cmd, const struct id *pvid, uint64_t *label_sector);
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const char *lvmcache_vgname_from_info(struct lvmcache_info *info);
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const struct format_type *lvmcache_fmt_from_info(struct lvmcache_info *info);
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int lvmcache_vgs_locked(void);
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int lvmcache_get_vgnameids(struct cmd_context *cmd, int include_internal,
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struct dm_list *vgnameids);
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/* Returns list of struct dm_str_list containing pool-allocated copy of pvids */
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struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname,
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const char *vgid);
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void lvmcache_drop_metadata(const char *vgname, int drop_precommitted);
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void lvmcache_commit_metadata(const char *vgname);
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int lvmcache_fid_add_mdas(struct lvmcache_info *info, struct format_instance *fid,
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const char *id, int id_len);
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int lvmcache_fid_add_mdas_pv(struct lvmcache_info *info, struct format_instance *fid);
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int lvmcache_fid_add_mdas_vg(struct lvmcache_vginfo *vginfo, struct format_instance *fid);
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int lvmcache_populate_pv_fields(struct lvmcache_info *info,
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struct volume_group *vg,
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struct physical_volume *pv);
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int lvmcache_check_format(struct lvmcache_info *info, const struct format_type *fmt);
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void lvmcache_del_mdas(struct lvmcache_info *info);
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void lvmcache_del_das(struct lvmcache_info *info);
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void lvmcache_del_bas(struct lvmcache_info *info);
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int lvmcache_add_mda(struct lvmcache_info *info, struct device *dev,
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uint64_t start, uint64_t size, unsigned ignored,
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struct metadata_area **mda_new);
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int lvmcache_add_da(struct lvmcache_info *info, uint64_t start, uint64_t size);
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int lvmcache_add_ba(struct lvmcache_info *info, uint64_t start, uint64_t size);
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void lvmcache_set_ext_version(struct lvmcache_info *info, uint32_t version);
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uint32_t lvmcache_ext_version(struct lvmcache_info *info);
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void lvmcache_set_ext_flags(struct lvmcache_info *info, uint32_t flags);
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uint32_t lvmcache_ext_flags(struct lvmcache_info *info);
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const struct format_type *lvmcache_fmt(struct lvmcache_info *info);
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struct label *lvmcache_get_label(struct lvmcache_info *info);
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struct label *lvmcache_get_dev_label(struct device *dev);
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int lvmcache_has_dev_info(struct device *dev);
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void lvmcache_update_pv(struct lvmcache_info *info, struct physical_volume *pv,
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const struct format_type *fmt);
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int lvmcache_update_das(struct lvmcache_info *info, struct physical_volume *pv);
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int lvmcache_update_bas(struct lvmcache_info *info, struct physical_volume *pv);
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int lvmcache_foreach_mda(struct lvmcache_info *info,
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int (*fun)(struct metadata_area *, void *),
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void *baton);
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int lvmcache_foreach_da(struct lvmcache_info *info,
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int (*fun)(struct disk_locn *, void *),
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void *baton);
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int lvmcache_foreach_ba(struct lvmcache_info *info,
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int (*fun)(struct disk_locn *, void *),
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void *baton);
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int lvmcache_foreach_pv(struct lvmcache_vginfo *vginfo,
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int (*fun)(struct lvmcache_info *, void *), void * baton);
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uint64_t lvmcache_device_size(struct lvmcache_info *info);
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void lvmcache_set_device_size(struct lvmcache_info *info, uint64_t size);
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struct device *lvmcache_device(struct lvmcache_info *info);
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int lvmcache_is_orphan(struct lvmcache_info *info);
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unsigned lvmcache_mda_count(struct lvmcache_info *info);
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int lvmcache_vgid_is_cached(const char *vgid);
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uint64_t lvmcache_smallest_mda_size(struct lvmcache_info *info);
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struct metadata_area *lvmcache_get_mda(struct cmd_context *cmd,
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const char *vgname,
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struct device *dev,
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int use_mda_num);
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int lvmcache_found_duplicate_pvs(void);
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int lvmcache_found_duplicate_vgnames(void);
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void lvmcache_pvscan_duplicate_check(struct cmd_context *cmd);
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int lvmcache_get_unused_duplicate_devs(struct cmd_context *cmd, struct dm_list *head);
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int vg_has_duplicate_pvs(struct volume_group *vg);
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int lvmcache_contains_lock_type_sanlock(struct cmd_context *cmd);
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void lvmcache_get_max_name_lengths(struct cmd_context *cmd,
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unsigned *pv_max_name_len, unsigned *vg_max_name_len);
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int lvmcache_vg_is_foreign(struct cmd_context *cmd, const char *vgname, const char *vgid);
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void lvmcache_lock_ordering(int enable);
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int lvmcache_dev_is_unchosen_duplicate(struct device *dev);
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void lvmcache_remove_unchosen_duplicate(struct device *dev);
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int lvmcache_pvid_in_unchosen_duplicates(const char *pvid);
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int lvmcache_get_vg_devs(struct cmd_context *cmd,
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struct lvmcache_vginfo *vginfo,
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struct dm_list *devs);
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void lvmcache_set_independent_location(const char *vgname);
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bool lvmcache_scan_mismatch(struct cmd_context *cmd, const char *vgname, const char *vgid);
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int lvmcache_vginfo_has_pvid(struct lvmcache_vginfo *vginfo, char *pvid);
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/*
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* These are clvmd-specific functions and are not related to lvmcache.
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* FIXME: rename these with a clvm_ prefix in place of lvmcache_
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*/
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void lvmcache_save_vg(struct volume_group *vg, int precommitted);
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struct volume_group *lvmcache_get_saved_vg(const char *vgid, int precommitted);
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struct volume_group *lvmcache_get_saved_vg_latest(const char *vgid);
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void lvmcache_drop_saved_vgid(const char *vgid);
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uint64_t lvmcache_max_metadata_size(void);
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void lvmcache_save_metadata_size(uint64_t val);
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int dev_in_device_list(struct device *dev, struct dm_list *head);
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bool lvmcache_has_bad_metadata(struct device *dev);
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bool lvmcache_has_old_metadata(struct cmd_context *cmd, const char *vgname, const char *vgid, struct device *dev);
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void lvmcache_get_outdated_devs(struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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struct dm_list *devs);
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void lvmcache_get_outdated_mdas(struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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struct device *dev,
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struct dm_list **mdas);
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bool lvmcache_is_outdated_dev(struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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struct device *dev);
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void lvmcache_del_outdated_devs(struct cmd_context *cmd,
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const char *vgname, const char *vgid);
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void lvmcache_save_bad_mda(struct lvmcache_info *info, struct metadata_area *mda);
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void lvmcache_get_bad_mdas(struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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struct dm_list *bad_mda_list);
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#endif
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