src/lib/mountpoint.c

	mountpoint.c revision 6daca8888bbf2b5bf26903cf397d5219ea752241
0N/A/* Copyright (c) 2006 Timo Sirainen */
2362N/A
0N/A#include "lib.h"
0N/A#include "mountpoint.h"
0N/A
0N/A#include <sys/stat.h>
2362N/A
0N/A#ifdef HAVE_STATVFS_MNTFROMNAME
2362N/A#  include <sys/statvfs.h> /* NetBSD 3.0+, FreeBSD 5.0+ */
0N/A#  define STATVFS_STR "statvfs"
0N/A#elif defined(HAVE_STATFS_MNTFROMNAME)
0N/A#  include <sys/param.h> /* Older BSDs */
0N/A#  include <sys/mount.h>
0N/A#  define statvfs statfs
0N/A#  define STATVFS_STR "statfs"
0N/A#elif defined(HAVE_MNTENT_H)
0N/A#  include <stdio.h>
0N/A#  include <mntent.h> /* Linux */
0N/A#elif defined(HAVE_SYS_MNTTAB_H)
0N/A#  include <stdio.h>
2362N/A#  include <sys/mnttab.h> /* Solaris */
2362N/A#else
2362N/A#  define MOUNTPOINT_UNKNOWN
0N/A#endif
0N/A
0N/A#ifdef HAVE_SYS_MNTTAB_H
0N/A#  define MTAB_PATH MNTTAB /* Solaris */
0N/A#else
0N/A#  define MTAB_PATH "/etc/mtab" /* Linux */
0N/A#endif
0N/A
0N/A/* AIX doesn't have these defined */
0N/A#ifndef MNTTYPE_SWAP
0N/A#  define MNTTYPE_SWAP "swap"
0N/A#endif
0N/A#ifndef MNTTYPE_IGNORE
0N/A#  define MNTTYPE_IGNORE "ignore"
0N/A#endif
0N/A
0N/Aint mountpoint_get(const char *path, pool_t pool, struct mountpoint *point_r)
0N/A{
0N/A#ifdef MOUNTPOINT_UNKNOWN
0N/A    memset(point_r, 0, sizeof(*point_r));
0N/A    errno = ENOSYS;
0N/A    return -1;
0N/A#elif defined (HAVE_STATFS_MNTFROMNAME) || defined(HAVE_STATVFS_MNTFROMNAME)
0N/A    /* BSDs */
0N/A    struct statvfs buf;
0N/A
0N/A    memset(point_r, 0, sizeof(*point_r));
0N/A    if (statvfs(path, &buf) < 0) {
0N/A        if (errno == ENOENT)
0N/A            return 0;
0N/A
0N/A        i_error(STATVFS_STR"(%s) failed: %m", path);
0N/A        return -1;
0N/A    }
0N/A
0N/A    point_r->device_path = p_strdup(pool, buf.f_mntfromname);
0N/A    point_r->mount_path = p_strdup(pool, buf.f_mntonname);
0N/A    point_r->type = p_strdup(pool, buf.f_fstypename);
0N/A    point_r->block_size = buf.f_bsize;
    return 1;
#else
    /* Linux, Solaris: /etc/mtab reading */
#ifdef HAVE_SYS_MNTTAB_H
    struct mnttab ent;
#else
    struct mntent *ent;
#endif
    struct stat st, st2;
    const char *device_path = NULL, *mount_path = NULL, *type = NULL;
    unsigned int block_size;
    FILE *f;

    memset(point_r, 0, sizeof(*point_r));
    if (stat(path, &st) < 0) {
        if (errno == ENOENT)
            return 0;

        i_error("stat(%s) failed: %m", path);
        return -1;
    }
    block_size = st.st_blksize;

#ifdef HAVE_SYS_MNTTAB_H
    /* Solaris */
    f = fopen(MTAB_PATH, "r");
    if (f == NULL) {
        i_error("fopen(%s) failed: %m", MTAB_PATH);
        return -1;
    }
    while ((getmntent(f, &ent)) == 0) {
        if (strcmp(ent.mnt_fstype, MNTTYPE_SWAP) == 0 ||
            strcmp(ent.mnt_fstype, MNTTYPE_IGNORE) == 0)
            continue;

        if (stat(ent.mnt_mountp, &st2) == 0 &&
            CMP_DEV_T(st.st_dev, st2.st_dev)) {
            device_path = ent.mnt_special;
            mount_path = ent.mnt_mountp;
            type = ent.mnt_fstype;
            break;
        }
    }
    fclose(f);
#else
    /* Linux */
    f = setmntent(MTAB_PATH, "r");
    if (f == NULL) {
        i_error("setmntent(%s) failed: %m", MTAB_PATH);
        return -1;
    }
    while ((ent = getmntent(f)) != NULL) {
        if (strcmp(ent->mnt_type, MNTTYPE_SWAP) == 0 ||
            strcmp(ent->mnt_type, MNTTYPE_IGNORE) == 0)
            continue;

        if (stat(ent->mnt_dir, &st2) == 0 &&
            CMP_DEV_T(st.st_dev, st2.st_dev)) {
            device_path = ent->mnt_fsname;
            mount_path = ent->mnt_dir;
            type = ent->mnt_type;
            break;
        }
    }
    endmntent(f);
#endif
    if (device_path == NULL)
        return 0;

    point_r->device_path = p_strdup(pool, device_path);
    point_r->mount_path = p_strdup(pool, mount_path);
    point_r->type = p_strdup(pool, type);
    point_r->block_size = block_size;
    return 1;
#endif
}