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/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

  /* Now fill in the fields we have information for.  */

  buf->f_bsize = fsbuf.f_bsize;

  /* Linux does not support f_frsize, so set it to the full block size.  */

  buf->f_frsize = fsbuf.f_bsize;

  buf->f_blocks = fsbuf.f_blocks;

  buf->f_bfree = fsbuf.f_bfree;

  buf->f_bavail = fsbuf.f_bavail;

  buf->f_files = fsbuf.f_files;

  buf->f_ffree = fsbuf.f_ffree;

  if (sizeof (buf->f_fsid) == sizeof (fsbuf.f_fsid))

    buf->f_fsid = (fsbuf.f_fsid.__val[0]

                   | ((unsigned long int) fsbuf.f_fsid.__val[1]

                      << (8 * (sizeof (buf->f_fsid)

                               - sizeof (fsbuf.f_fsid.__val[0])))));

  else

    /* We cannot help here.  The statvfs element is not large enough to

       contain both words of the statfs f_fsid field.  */

    buf->f_fsid = fsbuf.f_fsid.__val[0];

#ifdef _STATVFSBUF_F_UNUSED

  buf->__f_unused = 0;

#endif

  buf->f_namemax = fsbuf.f_namelen;

  memset (buf->__f_spare, '\0', 6 * sizeof (int));

  /* What remains to do is to fill the fields f_favail and f_flag.  */

  /* XXX I have no idea how to compute f_favail.  Any idea???  */

  buf->f_favail = buf->f_ffree;

  /* Determining the flags is tricky.  We have to read /proc/mounts or

     the /etc/mtab file and search for the entry which matches the given

     file.  The way we can test for matching filesystem is using the

     device number.  */

  buf->f_flag = 0;

  if (STAT (&st) >= 0)

    {

      int save_errno = errno;

      struct mntent mntbuf;

      FILE *mtab;

      mtab = __setmntent ("/proc/mounts", "r");

      if (mtab == NULL)

        mtab = __setmntent (_PATH_MOUNTED, "r");

      if (mtab != NULL)

        {

          char tmpbuf[1024];

          while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))

            {

              struct stat64 fsst;

              /* Find out about the device the current entry is for.  */

              if (stat64 (mntbuf.mnt_dir, &fsst) >= 0

                  && st.st_dev == fsst.st_dev)

                {

                  /* Bingo, we found the entry for the device FD is on.

                     Now interpret the option string.  */

                  char *cp = mntbuf.mnt_opts;

                  char *opt;

                  while ((opt = strsep (&cp, ",")) != NULL)

                    if (strcmp (opt, "ro") == 0)

                      buf->f_flag |= ST_RDONLY;

                    else if (strcmp (opt, "nosuid") == 0)

                      buf->f_flag |= ST_NOSUID;

                    else if (strcmp (opt, "noexec") == 0)

                      buf->f_flag |= ST_NOEXEC;

                    else if (strcmp (opt, "nodev") == 0)

                      buf->f_flag |= ST_NODEV;

                    else if (strcmp (opt, "sync") == 0)

                      buf->f_flag |= ST_SYNCHRONOUS;

                    else if (strcmp (opt, "mand") == 0)

                      buf->f_flag |= ST_MANDLOCK;

                    else if (strcmp (opt, "noatime") == 0)

                      buf->f_flag |= ST_NOATIME;

                    else if (strcmp (opt, "nodiratime") == 0)

                      buf->f_flag |= ST_NODIRATIME;

                  /* We can stop looking for more entries.  */

                  break;

                }

            }

          /* Close the file.  */

          __endmntent (mtab);

        }

      errno = (save_errno);

    }