156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <mntent.h>
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#include <paths.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <sys/statvfs.h>
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#include "linux_fsinfo.h"
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int
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fstatvfs (int fd, struct statvfs *buf)
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{
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struct statfs fsbuf;
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struct stat st;
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/* Get as much information as possible from the system. */
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if (__fstatfs (fd, &fsbuf) < 0)
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return -1;
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/* Now fill in the fields we have information for. */
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buf->f_bsize = fsbuf.f_bsize;
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buf->f_blocks = fsbuf.f_blocks;
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buf->f_bfree = fsbuf.f_bfree;
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buf->f_bavail = fsbuf.f_bavail;
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buf->f_files = fsbuf.f_files;
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buf->f_ffree = fsbuf.f_ffree;
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buf->f_fsid = fsbuf.f_fsid;
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buf->f_namemax = fsbuf.f_namelen;
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memset (buf->f_spare, '\0', 6 * sizeof (int));
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/* What remains to do is to fill the fields f_frsize, f_favail,
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and f_flag. */
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switch (fsbuf.f_type)
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{
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case EXT2_SUPER_MAGIC:
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/* This is not really correct since the fragment size can vary. */
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buf->f_frsize = 1024;
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break;
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case ADFS_SUPER_MAGIC:
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case AFFS_SUPER_MAGIC:
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case CODA_SUPER_MAGIC:
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case HPFS_SUPER_MAGIC:
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case ISOFS_SUPER_MAGIC:
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case MINIX_SUPER_MAGIC:
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case MINIX_SUPER_MAGIC2:
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case MINIX2_SUPER_MAGIC:
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case MINIX2_SUPER_MAGIC2:
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case MSDOS_SUPER_MAGIC:
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case NCP_SUPER_MAGIC:
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case NFS_SUPER_MAGIC:
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case PROC_SUPER_MAGIC:
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case SMB_SUPER_MAGIC:
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case XENIX_SUPER_MAGIC:
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case SYSV4_SUPER_MAGIC:
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case SYSV2_SUPER_MAGIC:
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case COH_SUPER_MAGIC:
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case UFS_MAGIC:
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case UFS_CIGAM:
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default:
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/* I hope it's safe to assume no fragmentation. */
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buf->f_frsize = buf->f_bsize;
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break;
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}
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/* XXX I have no idea how to compute f_favail. Any idea??? */
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buf->f_favail = buf->f_ffree;
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/* Determining the flags is tricky. We have to read /proc/mounts or
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the /etc/mtab file and search for the entry which matches the given
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file. The way we can test for matching filesystem is using the
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device number. */
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buf->f_flag = 0;
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if (fstat (fd, &st) >= 0)
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{
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int save_errno = errno;
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struct mntent mntbuf;
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FILE *mtab;
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mtab = __setmntent ("/proc/mounts", "r");
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if (mtab == NULL)
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mtab = __setmntent (_PATH_MOUNTED, "r");
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if (mtab != NULL)
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{
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char tmpbuf[1024];
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while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
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{
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struct stat fsst;
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/* Find out about the device the current entry is for. */
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if (stat (mntbuf.mnt_dir, &fsst) >= 0
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&& st.st_dev == fsst.st_dev)
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{
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/* Bingo, we found the entry for the device FD is on.
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Now interpret the option string. */
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char *cp = mntbuf.mnt_opts;
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char *opt;
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while ((opt = strsep (&cp, ",")) != NULL)
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if (strcmp (opt, "ro") == 0)
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buf->f_flag |= ST_RDONLY;
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else if (strcmp (opt, "nosuid") == 0)
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buf->f_flag |= ST_NOSUID;
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else if (strcmp (opt, "noexec") == 0)
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buf->f_flag |= ST_NOEXEC;
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else if (strcmp (opt, "nodev") == 0)
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buf->f_flag |= ST_NODEV;
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else if (strcmp (opt, "sync") == 0)
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buf->f_flag |= ST_SYNCHRONOUS;
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else if (strcmp (opt, "mand") == 0)
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buf->f_flag |= ST_MANDLOCK;
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else if (strcmp (opt, "noatime") == 0)
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buf->f_flag |= ST_NOATIME;
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else if (strcmp (opt, "nodiratime") == 0)
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buf->f_flag |= ST_NODIRATIME;
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/* We can stop looking for more entries. */
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break;
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}
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}
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/* Close the file. */
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__endmntent (mtab);
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}
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__set_errno (save_errno);
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}
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/* We signal success if the statfs call succeeded. */
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return 0;
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}
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