busybox

/* vi: set sw=4 ts=4: */

/*

 * Support functions for mounting devices by label/uuid

 *

 * Copyright (C) 2006 by Jason Schoon <floydpink@gmail.com>

 * Some portions cribbed from e2fsprogs, util-linux, dosfstools

 *

 * Licensed under GPLv2 or later, see file LICENSE in this source tree.

 */

​

//kbuild:lib-$(CONFIG_BLKID) += get_devname.o

//kbuild:lib-$(CONFIG_FINDFS) += get_devname.o

//kbuild:lib-$(CONFIG_FEATURE_MOUNT_LABEL) += get_devname.o

​

#include <sys/mount.h> /* BLKGETSIZE64 */

#if !defined(BLKGETSIZE64)

# define BLKGETSIZE64 _IOR(0x12,114,size_t)

#endif

#include "volume_id_internal.h"

​

static struct uuidCache_s {

    struct uuidCache_s *next;

//  int major, minor;

    char *device;

    char *label;

    char *uc_uuid; /* prefix makes it easier to grep for */

    IF_FEATURE_BLKID_TYPE(const char *type;)

} *uuidCache;

​

#if !ENABLE_FEATURE_BLKID_TYPE

#define get_label_uuid(fd, label, uuid, type) \

    get_label_uuid(fd, label, uuid)

#define uuidcache_addentry(device, label, uuid, type) \

    uuidcache_addentry(device, label, uuid)

#endif

​

/* Returns !0 on error.

 * Otherwise, returns malloc'ed strings for label and uuid

 * (and they can't be NULL, although they can be "").

 * NB: closes fd. */

static int

get_label_uuid(int fd, char **label, char **uuid, const char **type)

{

    int rv = 1;

    uint64_t size;

    struct volume_id *vid;

​

    /* fd is owned by vid now */

    vid = volume_id_open_node(fd);

​

    if (ioctl(/*vid->*/fd, BLKGETSIZE64, &size) != 0)

        size = 0;

​

    if (volume_id_probe_all(vid, /*0,*/ size) != 0)

        goto ret;

​

    if (vid->label[0] != '\0' || vid->uuid[0] != '\0'

#if ENABLE_FEATURE_BLKID_TYPE

     || vid->type != NULL

#endif

    ) {

        *label = xstrndup(vid->label, sizeof(vid->label));

        *uuid  = xstrndup(vid->uuid, sizeof(vid->uuid));

#if ENABLE_FEATURE_BLKID_TYPE

        *type = vid->type;

        dbg("found label '%s', uuid '%s', type '%s'", *label, *uuid, *type);

#else

        dbg("found label '%s', uuid '%s'", *label, *uuid);

#endif

        rv = 0;

    }

 ret:

    free_volume_id(vid); /* also closes fd */

    return rv;

}

​

/* NB: we take ownership of (malloc'ed) label and uuid */

static void

uuidcache_addentry(char *device, /*int major, int minor,*/ char *label, char *uuid, const char *type)

{

    struct uuidCache_s *last;

​

    if (!uuidCache) {

        last = uuidCache = xzalloc(sizeof(*uuidCache));

    } else {

        for (last = uuidCache; last->next; last = last->next)

            continue;

        last->next = xzalloc(sizeof(*uuidCache));

        last = last->next;

    }

    /*last->next = NULL; - xzalloc did it*/

//  last->major = major;