source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/blkid/blkidP.h @ 821

/*
 * blkidP.h - Internal interfaces for libblkid
 *
 * Copyright (C) 2001 Andreas Dilger
 * Copyright (C) 2003 Theodore Ts'o
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 * %End-Header%
 */

#ifndef _BLKID_BLKIDP_H
#define _BLKID_BLKIDP_H

#include <sys/types.h>
#include <stdio.h>

#include "blkid.h"
#include "list.h"

#ifdef __GNUC__
#define __BLKID_ATTR(x) __attribute__(x)
#else
#define __BLKID_ATTR(x)
#endif


/*
 * This describes the attributes of a specific device.
 * We can traverse all of the tags by bid_tags (linking to the tag bit_names).
 * The bid_label and bid_uuid fields are shortcuts to the LABEL and UUID tag
 * values, if they exist.
 */
struct blkid_struct_dev
{
    struct list_head    bid_devs;   /* All devices in the cache */
    struct list_head    bid_tags;   /* All tags for this device */
    blkid_cache     bid_cache;  /* Dev belongs to this cache */
    char            *bid_name;  /* Device inode pathname */
    char            *bid_type;  /* Preferred device TYPE */
    int         bid_pri;    /* Device priority */
    dev_t           bid_devno;  /* Device major/minor number */
    time_t          bid_time;   /* Last update time of device */
    unsigned int        bid_flags;  /* Device status bitflags */
    char            *bid_label; /* Shortcut to device LABEL */
    char            *bid_uuid;  /* Shortcut to binary UUID */
};

#define BLKID_BID_FL_VERIFIED   0x0001  /* Device data validated from disk */
#define BLKID_BID_FL_INVALID    0x0004  /* Device is invalid */

/*
 * Each tag defines a NAME=value pair for a particular device.  The tags
 * are linked via bit_names for a single device, so that traversing the
 * names list will get you a list of all tags associated with a device.
 * They are also linked via bit_values for all devices, so one can easily
 * search all tags with a given NAME for a specific value.
 */
struct blkid_struct_tag
{
    struct list_head    bit_tags;   /* All tags for this device */
    struct list_head    bit_names;  /* All tags with given NAME */
    char            *bit_name;  /* NAME of tag (shared) */
    char            *bit_val;   /* value of tag */
    blkid_dev       bit_dev;    /* pointer to device */
};
typedef struct blkid_struct_tag *blkid_tag;

/*
 * Minimum number of seconds between device probes, even when reading
 * from the cache.  This is to avoid re-probing all devices which were
 * just probed by another program that does not share the cache.
 */
#define BLKID_PROBE_MIN     2

/*
 * Time in seconds an entry remains verified in the in-memory cache
 * before being reverified (in case of long-running processes that
 * keep a cache in memory and continue to use it for a long time).
 */
#define BLKID_PROBE_INTERVAL    200

/* This describes an entire blkid cache file and probed devices.
 * We can traverse all of the found devices via bic_list.
 * We can traverse all of the tag types by bic_tags, which hold empty tags
 * for each tag type.  Those tags can be used as list_heads for iterating
 * through all devices with a specific tag type (e.g. LABEL).
 */
struct blkid_struct_cache
{
    struct list_head    bic_devs;   /* List head of all devices */
    struct list_head    bic_tags;   /* List head of all tag types */
    time_t          bic_time;   /* Last probe time */
    time_t          bic_ftime;  /* Mod time of the cachefile */
    unsigned int        bic_flags;  /* Status flags of the cache */
    char            *bic_filename;  /* filename of cache */
};

#define BLKID_BIC_FL_PROBED 0x0002  /* We probed /proc/partition devices */
#define BLKID_BIC_FL_CHANGED    0x0004  /* Cache has changed from disk */

extern char *blkid_strdup(const char *s);
extern char *blkid_strndup(const char *s, const int length);

#define BLKID_CACHE_FILE "/etc/blkid.tab"
extern const char *blkid_devdirs[];

#define BLKID_ERR_IO     5
#define BLKID_ERR_PROC   9
#define BLKID_ERR_MEM   12
#define BLKID_ERR_CACHE 14
#define BLKID_ERR_DEV   19
#define BLKID_ERR_PARAM 22
#define BLKID_ERR_BIG   27

/*
 * Priority settings for different types of devices
 */
#define BLKID_PRI_EVMS  30
#define BLKID_PRI_LVM   20
#define BLKID_PRI_MD    10

#if defined(TEST_PROGRAM) && !defined(CONFIG_BLKID_DEBUG)
#define CONFIG_BLKID_DEBUG
#endif

#define DEBUG_CACHE 0x0001
#define DEBUG_DUMP  0x0002
#define DEBUG_DEV   0x0004
#define DEBUG_DEVNAME   0x0008
#define DEBUG_DEVNO 0x0010
#define DEBUG_PROBE 0x0020
#define DEBUG_READ  0x0040
#define DEBUG_RESOLVE   0x0080
#define DEBUG_SAVE  0x0100
#define DEBUG_TAG   0x0200
#define DEBUG_INIT  0x8000
#define DEBUG_ALL   0xFFFF

#ifdef CONFIG_BLKID_DEBUG
#include <stdio.h>
extern int      blkid_debug_mask;
#define DBG(m,x)    if ((m) & blkid_debug_mask) x;
#else
#define DBG(m,x)
#endif

#ifdef CONFIG_BLKID_DEBUG
extern void blkid_debug_dump_dev(blkid_dev dev);
extern void blkid_debug_dump_tag(blkid_tag tag);
#endif

/* lseek.c */
/* extern blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence); */
#ifdef CONFIG_LFS
# define blkid_llseek lseek64
#else
# define blkid_llseek lseek
#endif

/* read.c */
extern void blkid_read_cache(blkid_cache cache);

/* save.c */
extern int blkid_flush_cache(blkid_cache cache);

/*
 * Functions to create and find a specific tag type: tag.c
 */
extern void blkid_free_tag(blkid_tag tag);
extern blkid_tag blkid_find_tag_dev(blkid_dev dev, const char *type);
extern int blkid_set_tag(blkid_dev dev, const char *name,
             const char *value, const int vlength);

/*
 * Functions to create and find a specific tag type: dev.c
 */
extern blkid_dev blkid_new_dev(void);
extern void blkid_free_dev(blkid_dev dev);

#ifdef __cplusplus
}
#endif

#endif /* _BLKID_BLKIDP_H */