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3cdaa6adb1
The 2.6.36 kernel provides an additional field in the statfs results. Use this value in the statvfs emulation to avoid filling in f_flag the hard way.
261 lines
7.3 KiB
C
261 lines
7.3 KiB
C
/* Copyright (C) 1998-2006, 2010 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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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 <stdbool.h>
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#include <stdio_ext.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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#include "kernel-features.h"
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/* Special internal-only bit value. */
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#define ST_VALID 0x0020
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#ifndef STATFS
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# define STATFS statfs
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# define STATVFS statvfs
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# define INTERNAL_STATVFS __internal_statvfs
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# ifndef __ASSUME_STATFS_F_FLAGS
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int
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__statvfs_getflags (const char *name, int fstype, struct stat64 *st)
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{
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if (st == NULL)
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return 0;
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const char *fsname = NULL;
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const char *fsname2 = NULL;
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const char *fsname3 = NULL;
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/* Map the filesystem type we got from the statfs call to a string. */
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switch (fstype)
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{
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case EXT2_SUPER_MAGIC:
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fsname = "ext4";
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fsname2 = "ext3";
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fsname3 = "ext2";
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break;
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case DEVPTS_SUPER_MAGIC:
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fsname= "devpts";
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break;
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case SHMFS_SUPER_MAGIC:
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fsname = "tmpfs";
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break;
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case PROC_SUPER_MAGIC:
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fsname = "proc";
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break;
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case USBDEVFS_SUPER_MAGIC:
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fsname = "usbdevfs";
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break;
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case AUTOFS_SUPER_MAGIC:
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fsname = "autofs";
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break;
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case NFS_SUPER_MAGIC:
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fsname = "nfs";
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break;
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case SYSFS_MAGIC:
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fsname = "sysfs";
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break;
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case REISERFS_SUPER_MAGIC:
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fsname = "reiserfs";
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break;
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case XFS_SUPER_MAGIC:
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fsname = "xfs";
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break;
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case JFS_SUPER_MAGIC:
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fsname = "jfs";
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break;
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case HPFS_SUPER_MAGIC:
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fsname = "hpfs";
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break;
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case DEVFS_SUPER_MAGIC:
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fsname = "devfs";
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break;
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case ISOFS_SUPER_MAGIC:
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fsname = "iso9660";
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break;
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case MSDOS_SUPER_MAGIC:
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fsname = "msdos";
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break;
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case NTFS_SUPER_MAGIC:
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fsname = "ntfs";
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break;
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case LOGFS_MAGIC_U32:
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fsname = "logfs";
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break;
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}
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FILE *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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int result = 0;
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if (mtab != NULL)
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{
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bool success = false;
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struct mntent mntbuf;
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char tmpbuf[1024];
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/* No locking needed. */
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(void) __fsetlocking (mtab, FSETLOCKING_BYCALLER);
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again:
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while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
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{
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/* In a first round we look for a given mount point, if
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we have a name. */
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if (name != NULL && strcmp (name, mntbuf.mnt_dir) != 0)
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continue;
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/* We need to look at the entry only if the filesystem
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name matches. If we have a filesystem name. */
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else if (fsname != NULL
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&& strcmp (fsname, mntbuf.mnt_type) != 0
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&& (fsname2 == NULL
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|| strcmp (fsname2, mntbuf.mnt_type) != 0)
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&& (fsname3 == NULL
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|| strcmp (fsname3, mntbuf.mnt_type) != 0))
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continue;
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/* Find out about the device the current entry is for. */
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struct stat64 fsst;
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if (stat64 (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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result |= ST_RDONLY;
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else if (strcmp (opt, "nosuid") == 0)
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result |= ST_NOSUID;
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else if (strcmp (opt, "noexec") == 0)
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result |= ST_NOEXEC;
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else if (strcmp (opt, "nodev") == 0)
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result |= ST_NODEV;
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else if (strcmp (opt, "sync") == 0)
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result |= ST_SYNCHRONOUS;
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else if (strcmp (opt, "mand") == 0)
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result |= ST_MANDLOCK;
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else if (strcmp (opt, "noatime") == 0)
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result |= ST_NOATIME;
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else if (strcmp (opt, "nodiratime") == 0)
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result |= ST_NODIRATIME;
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else if (strcmp (opt, "relatime") == 0)
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result |= ST_RELATIME;
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/* We can stop looking for more entries. */
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success = true;
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break;
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}
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}
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/* Maybe the kernel names for the filesystems changed or the
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statvfs call got a name which was not the mount point. Check
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again, this time without checking for name matches first. */
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if (! success && (name != NULL || fsname != NULL))
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{
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if (name != NULL)
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/* Try without a mount point name. */
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name = NULL;
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else
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{
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/* Try without a filesystem name. */
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assert (fsname != NULL);
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fsname = fsname2 = fsname3 = NULL;
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}
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/* It is not strictly allowed to use rewind here. But
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this code is part of the implementation so it is
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acceptable. */
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rewind (mtab);
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goto again;
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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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return result;
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}
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# endif
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#else
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extern int __statvfs_getflags (const char *name, int fstype,
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struct stat64 *st);
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#endif
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void
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INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
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struct STATFS *fsbuf, struct stat64 *st)
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{
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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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/* Linux has the f_frsize size only in later version of the kernel.
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If the value is not filled in use f_bsize. */
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buf->f_frsize = fsbuf->f_frsize ?: 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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if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
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buf->f_fsid = (fsbuf->f_fsid.__val[0]
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| ((unsigned long int) fsbuf->f_fsid.__val[1]
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<< (8 * (sizeof (buf->f_fsid)
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- sizeof (fsbuf->f_fsid.__val[0])))));
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else
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/* We cannot help here. The statvfs element is not large enough to
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contain both words of the statfs f_fsid field. */
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buf->f_fsid = fsbuf->f_fsid.__val[0];
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#ifdef _STATVFSBUF_F_UNUSED
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buf->__f_unused = 0;
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#endif
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buf->f_namemax = fsbuf->f_namelen;
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memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
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/* What remains to do is to fill the fields f_favail and f_flag. */
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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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#ifndef __ASSUME_STATFS_F_FLAGS
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if ((fsbuf->f_flags & ST_VALID) == 0)
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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 = __statvfs_getflags (name, fsbuf->f_type, st);
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else
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#endif
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buf->f_flag = fsbuf->f_flags ^ ST_VALID;
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}
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