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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.)
110 lines
3.9 KiB
C
110 lines
3.9 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2010 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_PV_H
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#define _LVM_PV_H
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#include "lib/uuid/uuid.h"
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#include "device_mapper/all.h"
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struct device;
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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 id id;
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struct id old_id; /* Set during pvchange -u. */
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struct device *dev;
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const char *device_hint; /* primary name last time metadata was written */
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const char *device_id;
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const char *device_id_type;
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const struct format_type *fmt;
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struct format_instance *fid;
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/*
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* vg_name and vg_id are used before the parent VG struct exists.
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* FIXME: Investigate removal/substitution with 'vg' fields.
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*/
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const char *vg_name;
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struct id vg_id; /* variables named "vgid" are char ID_LEN+1 */
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/*
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* 'vg' is set and maintained when the PV belongs to a 'pvs'
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* list in a parent VG struct.
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*/
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struct volume_group *vg;
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uint64_t status;
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uint64_t size;
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/* bootloader area */
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uint64_t ba_start;
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uint64_t ba_size;
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/* physical extents */
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uint32_t pe_size;
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uint64_t pe_start;
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uint32_t pe_count;
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uint32_t pe_alloc_count;
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uint64_t pe_align;
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uint64_t pe_align_offset;
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/* This is true whenever the represented PV has a label associated. */
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uint64_t is_labelled:1;
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uint64_t unused_missing_cleared:1;
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/* NB. label_sector is valid whenever is_labelled is true */
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uint64_t label_sector;
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struct dm_list segments; /* Ordered pv_segments covering complete PV */
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struct dm_list tags;
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};
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char *pv_fmt_dup(const struct physical_volume *pv);
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char *pv_name_dup(struct dm_pool *mem, const struct physical_volume *pv);
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struct device *pv_dev(const struct physical_volume *pv);
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const char *pv_vg_name(const struct physical_volume *pv);
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char *pv_attr_dup(struct dm_pool *mem, const struct physical_volume *pv);
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const char *pv_dev_name(const struct physical_volume *pv);
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char *pv_uuid_dup(struct dm_pool *mem, const struct physical_volume *pv);
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char *pv_tags_dup(const struct physical_volume *pv);
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char *pv_deviceid_dup(struct dm_pool *mem, const struct physical_volume *pv);
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char *pv_deviceidtype_dup(struct dm_pool *mem, const struct physical_volume *pv);
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uint64_t pv_size(const struct physical_volume *pv);
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uint64_t pv_size_field(const struct physical_volume *pv);
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uint64_t pv_dev_size(const struct physical_volume *pv);
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uint64_t pv_free(const struct physical_volume *pv);
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uint64_t pv_status(const struct physical_volume *pv);
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uint32_t pv_pe_size(const struct physical_volume *pv);
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uint64_t pv_pe_start(const struct physical_volume *pv);
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uint64_t pv_ba_start(const struct physical_volume *pv);
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uint64_t pv_ba_size(const struct physical_volume *pv);
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uint32_t pv_pe_count(const struct physical_volume *pv);
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uint32_t pv_pe_alloc_count(const struct physical_volume *pv);
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uint64_t pv_mda_size(const struct physical_volume *pv);
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struct lvmcache_info;
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uint64_t lvmcache_info_mda_free(struct lvmcache_info *info);
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uint64_t pv_mda_free(const struct physical_volume *pv);
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uint64_t pv_used(const struct physical_volume *pv);
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uint32_t pv_mda_count(const struct physical_volume *pv);
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uint32_t pv_mda_used_count(const struct physical_volume *pv);
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unsigned pv_mda_set_ignored(const struct physical_volume *pv, unsigned mda_ignored);
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int is_orphan(const struct physical_volume *pv);
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int is_missing_pv(const struct physical_volume *pv);
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int is_used_pv(const struct physical_volume *pv);
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int is_pv(const struct physical_volume *pv);
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struct label *pv_label(const struct physical_volume *pv);
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#endif /* _LVM_PV_H */
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