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d992bbbaa3
Instead of regenerating config tree and parsing same data again, check whether export_vg_to_buffer does not produce same string as the one already cached - in this case keep it, otherwise throw cached content away. For the code simplicity calling _free_cached_vgmetadata() with vgmetadata == NULL as the function handles this itself. Note: sometimes export_vg_to_buffer() generates almost the same data with just different time stamp, but for the patch simplicity, data are reparsed in this case. This patch currently helps for vgrefresh.
129 lines
4.7 KiB
C
129 lines
4.7 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "dev-cache.h"
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#include "uuid.h"
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#include "label.h"
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#include "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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#define CACHE_INVALID 0x00000001
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#define CACHE_LOCKED 0x00000002
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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 config_tree;
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/* One per VG */
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struct lvmcache_vginfo {
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struct dm_list list; /* Join these vginfos together */
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struct dm_list infos; /* List head for lvmcache_infos */
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const struct format_type *fmt;
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char *vgname; /* "" == orphan */
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uint32_t status;
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char vgid[ID_LEN + 1];
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char _padding[7];
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struct lvmcache_vginfo *next; /* Another VG with same name? */
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char *creation_host;
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size_t vgmetadata_size;
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char *vgmetadata; /* Copy of VG metadata as format_text string */
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struct config_tree *cft; /* Config tree created from vgmetadata */
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/* Lifetime is directly tied to vgmetadata */
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unsigned precommitted; /* Is vgmetadata live or precommitted? */
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};
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/* One per device */
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struct lvmcache_info {
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struct dm_list list; /* Join VG members together */
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struct dm_list mdas; /* list head for metadata areas */
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struct dm_list das; /* list head for data areas */
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struct lvmcache_vginfo *vginfo; /* NULL == unknown */
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struct label *label;
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const struct format_type *fmt;
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struct device *dev;
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uint64_t device_size; /* Bytes */
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uint32_t status;
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};
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int lvmcache_init(void);
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void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans);
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/* Set full_scan to 1 to reread every filtered device label or
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* 2 to rescan /dev for new devices */
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int lvmcache_label_scan(struct cmd_context *cmd, int full_scan);
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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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/* Update things */
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int lvmcache_update_vgname_and_id(struct lvmcache_info *info,
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const char *vgname, const char *vgid,
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uint32_t vgstatus, const char *hostname);
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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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int lvmcache_verify_lock_order(const char *vgname);
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/* Queries */
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const struct format_type *fmt_from_vgname(const char *vgname, const char *vgid, unsigned revalidate_labels);
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struct lvmcache_vginfo *vginfo_from_vgname(const char *vgname,
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const char *vgid);
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struct lvmcache_vginfo *vginfo_from_vgid(const char *vgid);
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struct lvmcache_info *info_from_pvid(const char *pvid, int valid_only);
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const char *vgname_from_vgid(struct dm_pool *mem, const char *vgid);
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struct device *device_from_pvid(struct cmd_context *cmd, const struct id *pvid,
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unsigned *scan_done_once);
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const char *pvid_from_devname(struct cmd_context *cmd,
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const char *dev_name);
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char *lvmcache_vgname_from_pvid(struct cmd_context *cmd, const char *pvid);
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int vgs_locked(void);
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int vgname_is_locked(const char *vgname);
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/* Returns list of struct str_lists containing pool-allocated copy of vgnames */
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/* If include_internal is not set, return only proper vg names. */
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struct dm_list *lvmcache_get_vgnames(struct cmd_context *cmd,
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int include_internal);
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/* Returns list of struct str_lists containing pool-allocated copy of vgids */
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/* If include_internal is not set, return only proper vg ids. */
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struct dm_list *lvmcache_get_vgids(struct cmd_context *cmd,
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int include_internal);
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/* Returns list of struct str_lists 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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/* Returns cached volume group metadata. */
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struct volume_group *lvmcache_get_vg(const char *vgid, unsigned precommitted);
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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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#endif
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