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/* Get file-specific information about a file. Linux version.
Copyright (C) 1991,1995,1996,1998-2003,2008,2010,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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. */
#include <unistd.h>
#include <errno.h>
#include "pathconf.h"
#include "linux_fsinfo.h"
#include <not-cancel.h>
static long int posix_pathconf (const char *file, int name);
/* Define this first, so it can be inlined. */
#define __pathconf static posix_pathconf
#include <sysdeps/posix/pathconf.c>
/* Get file-specific information about FILE. */
long int
__pathconf (const char *file, int name)
{
struct statfs fsbuf;
int fd;
switch (name)
{
case _PC_LINK_MAX:
return __statfs_link_max (__statfs (file, &fsbuf), &fsbuf);
case _PC_FILESIZEBITS:
return __statfs_filesize_max (__statfs (file, &fsbuf), &fsbuf);
case _PC_2_SYMLINKS:
return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
case _PC_CHOWN_RESTRICTED:
return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf);
case _PC_PIPE_BUF:
fd = open_not_cancel_2 (file, O_RDONLY|O_NONBLOCK);
if (fd >= 0)
{
long int r = __fcntl (fd, F_GETPIPE_SZ);
close_not_cancel_no_status (fd);
if (r > 0)
return r;
}
/* FALLTHROUGH */
default:
return posix_pathconf (file, name);
}
}
/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
long int
__statfs_link_max (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return LINUX_LINK_MAX;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case EXT2_SUPER_MAGIC:
return EXT2_LINK_MAX;
case MINIX_SUPER_MAGIC:
case MINIX_SUPER_MAGIC2:
return MINIX_LINK_MAX;
case MINIX2_SUPER_MAGIC:
case MINIX2_SUPER_MAGIC2:
return MINIX2_LINK_MAX;
case XENIX_SUPER_MAGIC:
return XENIX_LINK_MAX;
case SYSV4_SUPER_MAGIC:
case SYSV2_SUPER_MAGIC:
return SYSV_LINK_MAX;
case COH_SUPER_MAGIC:
return COH_LINK_MAX;
case UFS_MAGIC:
case UFS_CIGAM:
return UFS_LINK_MAX;
case REISERFS_SUPER_MAGIC:
return REISERFS_LINK_MAX;
case XFS_SUPER_MAGIC:
return XFS_LINK_MAX;
default:
return LINUX_LINK_MAX;
}
}
/* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
long int
__statfs_filesize_max (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 32;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case BTRFS_SUPER_MAGIC:
return 255;
case EXT2_SUPER_MAGIC:
case UFS_MAGIC:
case UFS_CIGAM:
case REISERFS_SUPER_MAGIC:
case XFS_SUPER_MAGIC:
case SMB_SUPER_MAGIC:
case NTFS_SUPER_MAGIC:
case UDF_SUPER_MAGIC:
case JFS_SUPER_MAGIC:
case VXFS_SUPER_MAGIC:
case CGROUP_SUPER_MAGIC:
return 64;
case MSDOS_SUPER_MAGIC:
case JFFS_SUPER_MAGIC:
case JFFS2_SUPER_MAGIC:
case NCP_SUPER_MAGIC:
case ROMFS_SUPER_MAGIC:
return 32;
default:
return 32;
}
}
/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
long int
__statfs_symlinks (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 1;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case ADFS_SUPER_MAGIC:
case BFS_MAGIC:
case CRAMFS_MAGIC:
case DEVPTS_SUPER_MAGIC:
case EFS_SUPER_MAGIC:
case EFS_MAGIC:
case MSDOS_SUPER_MAGIC:
case NTFS_SUPER_MAGIC:
case QNX4_SUPER_MAGIC:
case ROMFS_SUPER_MAGIC:
/* No symlink support. */
return 0;
default:
return 1;
}
}
/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
long int
__statfs_chown_restricted (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 1;
/* Some error occured. */
return -1;
}
int fd;
long int retval = 1;
switch (fsbuf->f_type)
{
case XFS_SUPER_MAGIC:
/* Read the value from /proc/sys/fs/xfs/restrict_chown. If we cannot
read it default to assume the restriction is in place. */
fd = open_not_cancel_2 ("/proc/sys/fs/xfs/restrict_chown", O_RDONLY);
if (fd != -1)
{
char buf[2];
if (TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, 2)) == 2
&& buf[0] >= '0' && buf[0] <= '1')
retval = buf[0] - '0';
close_not_cancel_no_status (fd);
}
break;
default:
break;
}
return retval;
}
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