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117160b27e
Native disk scanning is now both reduced and async/parallel, which makes it comparable in performance (and often faster) when compared to lvm using lvmetad. Autoactivation now uses local temp files to record online PVs, and no longer requires lvmetad. There should be no apparent command-level change in behavior.
213 lines
8.3 KiB
C
213 lines
8.3 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 mda_checksum;
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size_t mda_size;
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int zero_offset;
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int seqno;
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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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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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int lvmcache_found_duplicate_pvs(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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int lvmcache_scan_mismatch(struct cmd_context *cmd, const char *vgname, const char *vgid);
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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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int dev_in_device_list(struct device *dev, struct dm_list *head);
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#endif
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