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pvid and vgid are sometimes a null-terminated string, and other times a 'struct id', and the two types were often cast between each other. When a struct id was cast to a char pointer, the resulting string would not necessarily be null terminated. Casting a null-terminated string id to a struct id is fine, but is still avoided when possible. A struct id is: int8_t uuid[ID_LEN] A string id is: char pvid[ID_LEN + 1] A convention is introduced to help distinguish them: - variables and struct fields named "pvid" or "vgid" should be null-terminated strings. - variables and struct fields named "pv_id" or "vg_id" should be struct id's. - examples: char pvid[ID_LEN + 1]; char vgid[ID_LEN + 1]; struct id pv_id; struct id vg_id; Function names also attempt to follow this convention. Avoid casting between the two types as much as possible, with limited exceptions when known to be safe and clearly commented. Avoid using variations of strcpy and strcmp, and instead use memcpy/memcmp with ID_LEN (with similar limited exceptions possible.)
231 lines
9.5 KiB
C
231 lines
9.5 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 during label scan. It's used to populate
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* basic lvmcache vginfo/info during label scan prior to
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* vg_read().
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*/
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struct lvmcache_vgsummary {
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const char *vgname;
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char vgid[ID_LEN + 1];
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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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unsigned mismatch:1; /* lvmcache sets if this summary differs from previous values */
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struct dm_list pvsummaries;
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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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int lvmcache_label_rescan_vg_rw(struct cmd_context *cmd, const char *vgname, const char *vgid);
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int lvmcache_label_reopen_vg_rw(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 cmd_context *cmd, struct labeller *labeller, const char *pvid,
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struct device *dev, uint64_t label_sector,
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const char *vgname, const char *vgid,
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uint32_t vgstatus, int *is_duplicate);
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int lvmcache_add_orphan_vginfo(struct cmd_context *cmd, 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 cmd_context *cmd, struct lvmcache_info *info,
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struct lvmcache_vgsummary *vgsummary);
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int lvmcache_update_vg_from_read(struct volume_group *vg, unsigned precommitted);
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int lvmcache_update_vg_from_write(struct volume_group *vg);
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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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int lvmcache_lookup_mda(struct lvmcache_vgsummary *vgsummary);
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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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struct lvmcache_info *lvmcache_info_from_pv_id(const struct id *pv_id, 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_pv_id(struct cmd_context *cmd, const struct id *pv_id, 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_get_vgnameids(struct cmd_context *cmd,
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struct dm_list *vgnameids,
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const char *only_this_vgname,
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int include_internal);
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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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unsigned lvmcache_mda_count(struct lvmcache_info *info);
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uint64_t lvmcache_smallest_mda_size(struct lvmcache_info *info);
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bool lvmcache_has_duplicate_devs(void);
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void lvmcache_del_dev_from_duplicates(struct device *dev);
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bool lvmcache_dev_is_unused_duplicate(struct device *dev);
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int lvmcache_pvid_in_unused_duplicates(const char *pvid);
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int lvmcache_get_unused_duplicates(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_found_duplicate_vgnames(void);
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bool lvmcache_has_duplicate_local_vgname(const char *vgid, const char *vgname);
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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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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, const char *pvid_arg);
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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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void lvmcache_get_mdas(struct cmd_context *cmd,
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const char *vgname, const char *vgid,
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struct dm_list *mda_list);
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const char *dev_filtered_reason(struct device *dev);
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const char *devname_error_reason(const char *devname);
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struct metadata_area *lvmcache_get_dev_mda(struct device *dev, int mda_num);
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void lvmcache_extra_md_component_checks(struct cmd_context *cmd);
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unsigned int lvmcache_vg_info_count(void);
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#endif
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