183 lines
5.3 KiB
C
183 lines
5.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* blkidP.h - Internal interfaces for libblkid
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*
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* Copyright (C) 2001 Andreas Dilger
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* Copyright (C) 2003 Theodore Ts'o
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* %End-Header%
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*/
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#ifndef BLKID_BLKIDP_H
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#define BLKID_BLKIDP_H 1
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#include <sys/types.h>
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#include <stdio.h>
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#include "blkid.h"
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#include "list.h"
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#ifdef __GNUC__
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#define __BLKID_ATTR(x) __attribute__(x)
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#else
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#define __BLKID_ATTR(x)
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#endif
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/*
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* This describes the attributes of a specific device.
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* We can traverse all of the tags by bid_tags (linking to the tag bit_names).
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* The bid_label and bid_uuid fields are shortcuts to the LABEL and UUID tag
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* values, if they exist.
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*/
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struct blkid_struct_dev
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{
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struct list_head bid_devs; /* All devices in the cache */
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struct list_head bid_tags; /* All tags for this device */
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blkid_cache bid_cache; /* Dev belongs to this cache */
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char *bid_name; /* Device inode pathname */
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char *bid_type; /* Preferred device TYPE */
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int bid_pri; /* Device priority */
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dev_t bid_devno; /* Device major/minor number */
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time_t bid_time; /* Last update time of device */
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unsigned int bid_flags; /* Device status bitflags */
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char *bid_label; /* Shortcut to device LABEL */
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char *bid_uuid; /* Shortcut to binary UUID */
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};
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#define BLKID_BID_FL_VERIFIED 0x0001 /* Device data validated from disk */
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#define BLKID_BID_FL_INVALID 0x0004 /* Device is invalid */
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/*
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* Each tag defines a NAME=value pair for a particular device. The tags
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* are linked via bit_names for a single device, so that traversing the
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* names list will get you a list of all tags associated with a device.
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* They are also linked via bit_values for all devices, so one can easily
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* search all tags with a given NAME for a specific value.
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*/
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struct blkid_struct_tag
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{
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struct list_head bit_tags; /* All tags for this device */
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struct list_head bit_names; /* All tags with given NAME */
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char *bit_name; /* NAME of tag (shared) */
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char *bit_val; /* value of tag */
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blkid_dev bit_dev; /* pointer to device */
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};
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typedef struct blkid_struct_tag *blkid_tag;
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/*
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* Minimum number of seconds between device probes, even when reading
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* from the cache. This is to avoid re-probing all devices which were
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* just probed by another program that does not share the cache.
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*/
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#define BLKID_PROBE_MIN 2
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/*
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* Time in seconds an entry remains verified in the in-memory cache
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* before being reverified (in case of long-running processes that
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* keep a cache in memory and continue to use it for a long time).
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*/
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#define BLKID_PROBE_INTERVAL 200
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/* This describes an entire blkid cache file and probed devices.
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* We can traverse all of the found devices via bic_list.
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* We can traverse all of the tag types by bic_tags, which hold empty tags
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* for each tag type. Those tags can be used as list_heads for iterating
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* through all devices with a specific tag type (e.g. LABEL).
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*/
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struct blkid_struct_cache
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{
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struct list_head bic_devs; /* List head of all devices */
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struct list_head bic_tags; /* List head of all tag types */
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time_t bic_time; /* Last probe time */
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time_t bic_ftime; /* Mod time of the cachefile */
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unsigned int bic_flags; /* Status flags of the cache */
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char *bic_filename; /* filename of cache */
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};
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#define BLKID_BIC_FL_PROBED 0x0002 /* We probed /proc/partition devices */
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#define BLKID_BIC_FL_CHANGED 0x0004 /* Cache has changed from disk */
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extern char *blkid_strdup(const char *s);
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extern char *blkid_strndup(const char *s, const int length);
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#define BLKID_CACHE_FILE "/etc/blkid.tab"
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extern const char *blkid_devdirs[];
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#define BLKID_ERR_IO 5
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#define BLKID_ERR_PROC 9
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#define BLKID_ERR_MEM 12
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#define BLKID_ERR_CACHE 14
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#define BLKID_ERR_DEV 19
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#define BLKID_ERR_PARAM 22
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#define BLKID_ERR_BIG 27
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/*
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* Priority settings for different types of devices
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*/
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#define BLKID_PRI_EVMS 30
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#define BLKID_PRI_LVM 20
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#define BLKID_PRI_MD 10
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#if defined(TEST_PROGRAM) && !defined(CONFIG_BLKID_DEBUG)
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#define CONFIG_BLKID_DEBUG
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#endif
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#define DEBUG_CACHE 0x0001
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#define DEBUG_DUMP 0x0002
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#define DEBUG_DEV 0x0004
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#define DEBUG_DEVNAME 0x0008
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#define DEBUG_DEVNO 0x0010
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#define DEBUG_PROBE 0x0020
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#define DEBUG_READ 0x0040
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#define DEBUG_RESOLVE 0x0080
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#define DEBUG_SAVE 0x0100
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#define DEBUG_TAG 0x0200
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#define DEBUG_INIT 0x8000
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#define DEBUG_ALL 0xFFFF
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#ifdef CONFIG_BLKID_DEBUG
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#include <stdio.h>
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extern int blkid_debug_mask;
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#define DBG(m,x) if ((m) & blkid_debug_mask) x;
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#else
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#define DBG(m,x)
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#endif
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#ifdef CONFIG_BLKID_DEBUG
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extern void blkid_debug_dump_dev(blkid_dev dev);
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extern void blkid_debug_dump_tag(blkid_tag tag);
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#endif
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/* lseek.c */
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/* extern blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence); */
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#ifdef CONFIG_LFS
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# define blkid_llseek lseek64
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#else
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# define blkid_llseek lseek
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#endif
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/* read.c */
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extern void blkid_read_cache(blkid_cache cache);
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/* save.c */
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extern int blkid_flush_cache(blkid_cache cache);
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/*
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* Functions to create and find a specific tag type: tag.c
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*/
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extern void blkid_free_tag(blkid_tag tag);
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extern blkid_tag blkid_find_tag_dev(blkid_dev dev, const char *type);
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extern int blkid_set_tag(blkid_dev dev, const char *name,
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const char *value, const int vlength);
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/*
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* Functions to create and find a specific tag type: dev.c
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*/
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extern blkid_dev blkid_new_dev(void);
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extern void blkid_free_dev(blkid_dev dev);
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#endif
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