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/*
* vmfs-tools - Tools to access VMFS filesystems
* Copyright (C) 2009 Christophe Fillot <cf@utc.fr>
* Copyright (C) 2009 Mike Hommey <mh@glandium.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef VMFS_METADATA_H
#define VMFS_METADATA_H
#include <stddef.h>
#define VMFS_METADATA_HDR_SIZE 512
struct vmfs_metadata_hdr_raw {
uint32_t magic; /* Magic number */
uint64_t pos; /* Position in the volume */
uint64_t hb_pos; /* Heartbeat position */
uint64_t hb_seq; /* Heartbeat sequence */
uint64_t obj_seq; /* Object sequence */
uint32_t hb_lock; /* Heartbeat lock flag */
uuid_t hb_uuid; /* UUID of locking server */
uint64_t mtime;
u_char pad1[0x1c0]; /* Padding/unknown */
} __attribute__((packed));
#define VMFS_MDH_OFS_MAGIC offsetof(struct vmfs_metadata_hdr_raw, magic)
#define VMFS_MDH_OFS_POS offsetof(struct vmfs_metadata_hdr_raw, pos)
#define VMFS_MDH_OFS_HB_POS offsetof(struct vmfs_metadata_hdr_raw, hb_pos)
#define VMFS_MDH_OFS_HB_SEQ offsetof(struct vmfs_metadata_hdr_raw, hb_seq)
#define VMFS_MDH_OFS_OBJ_SEQ offsetof(struct vmfs_metadata_hdr_raw, obj_seq)
#define VMFS_MDH_OFS_HB_LOCK offsetof(struct vmfs_metadata_hdr_raw, hb_lock)
#define VMFS_MDH_OFS_HB_UUID offsetof(struct vmfs_metadata_hdr_raw, hb_uuid)
#define VMFS_MDH_OFS_MTIME offsetof(struct vmfs_metadata_hdr_raw, mtime)
struct vmfs_metadata_hdr {
uint32_t magic;
uint64_t pos;
uint64_t hb_pos;
uint64_t hb_seq;
uint64_t obj_seq;
uint32_t hb_lock;
uuid_t hb_uuid;
uint64_t mtime;
};
static inline bool vmfs_metadata_is_locked(vmfs_metadata_hdr_t *mdh)
{
return(mdh->hb_lock != 0);
}
/* Read a metadata header */
int vmfs_metadata_hdr_read(vmfs_metadata_hdr_t *mdh,const u_char *buf);
/* Write a metadata header */
int vmfs_metadata_hdr_write(const vmfs_metadata_hdr_t *mdh,u_char *buf);
/* Lock and read metadata at specified position */
int vmfs_metadata_lock(vmfs_fs_t *fs,off_t pos,u_char *buf,size_t buf_len,
vmfs_metadata_hdr_t *mdh);
/* Unlock metadata */
int vmfs_metadata_unlock(vmfs_fs_t *fs,vmfs_metadata_hdr_t *mdh);
#endif
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