1 /* Get file-specific information about a file. Linux version.
2 Copyright (C) 1991,1995,1996,1998-2003,2008,2010 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include "linux_fsinfo.h"
25 #include <not-cancel.h>
27 static long int posix_pathconf (const char *file
, int name
);
29 /* Define this first, so it can be inlined. */
30 #define __pathconf static posix_pathconf
31 #include <sysdeps/posix/pathconf.c>
34 /* Get file-specific information about FILE. */
36 __pathconf (const char *file
, int name
)
43 return __statfs_link_max (__statfs (file
, &fsbuf
), &fsbuf
);
45 case _PC_FILESIZEBITS
:
46 return __statfs_filesize_max (__statfs (file
, &fsbuf
), &fsbuf
);
49 return __statfs_symlinks (__statfs (file
, &fsbuf
), &fsbuf
);
51 case _PC_CHOWN_RESTRICTED
:
52 return __statfs_chown_restricted (__statfs (file
, &fsbuf
), &fsbuf
);
55 return posix_pathconf (file
, name
);
60 /* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
62 __statfs_link_max (int result
, const struct statfs
*fsbuf
)
67 /* Not possible, return the default value. */
68 return LINUX_LINK_MAX
;
70 /* Some error occured. */
74 switch (fsbuf
->f_type
)
76 case EXT2_SUPER_MAGIC
:
79 case MINIX_SUPER_MAGIC
:
80 case MINIX_SUPER_MAGIC2
:
81 return MINIX_LINK_MAX
;
83 case MINIX2_SUPER_MAGIC
:
84 case MINIX2_SUPER_MAGIC2
:
85 return MINIX2_LINK_MAX
;
87 case XENIX_SUPER_MAGIC
:
88 return XENIX_LINK_MAX
;
90 case SYSV4_SUPER_MAGIC
:
91 case SYSV2_SUPER_MAGIC
:
101 case REISERFS_SUPER_MAGIC
:
102 return REISERFS_LINK_MAX
;
104 case XFS_SUPER_MAGIC
:
108 return LINUX_LINK_MAX
;
113 /* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
115 __statfs_filesize_max (int result
, const struct statfs
*fsbuf
)
120 /* Not possible, return the default value. */
123 /* Some error occured. */
127 switch (fsbuf
->f_type
)
129 case BTRFS_SUPER_MAGIC
:
132 case EXT2_SUPER_MAGIC
:
135 case REISERFS_SUPER_MAGIC
:
136 case XFS_SUPER_MAGIC
:
137 case SMB_SUPER_MAGIC
:
138 case NTFS_SUPER_MAGIC
:
139 case UDF_SUPER_MAGIC
:
140 case JFS_SUPER_MAGIC
:
141 case VXFS_SUPER_MAGIC
:
142 case CGROUP_SUPER_MAGIC
:
145 case MSDOS_SUPER_MAGIC
:
146 case JFFS_SUPER_MAGIC
:
147 case JFFS2_SUPER_MAGIC
:
148 case NCP_SUPER_MAGIC
:
149 case ROMFS_SUPER_MAGIC
:
158 /* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
160 __statfs_symlinks (int result
, const struct statfs
*fsbuf
)
165 /* Not possible, return the default value. */
168 /* Some error occured. */
172 switch (fsbuf
->f_type
)
174 case ADFS_SUPER_MAGIC
:
177 case DEVPTS_SUPER_MAGIC
:
178 case EFS_SUPER_MAGIC
:
180 case MSDOS_SUPER_MAGIC
:
181 case NTFS_SUPER_MAGIC
:
182 case QNX4_SUPER_MAGIC
:
183 case ROMFS_SUPER_MAGIC
:
184 /* No symlink support. */
193 /* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
195 __statfs_chown_restricted (int result
, const struct statfs
*fsbuf
)
200 /* Not possible, return the default value. */
203 /* Some error occured. */
209 switch (fsbuf
->f_type
)
211 case XFS_SUPER_MAGIC
:
212 /* Read the value from /proc/sys/fs/xfs/restrict_chown. If we cannot
213 read it default to assume the restriction is in place. */
214 fd
= open_not_cancel_2 ("/proc/sys/fs/xfs/restrict_chown", O_RDONLY
);
218 if (TEMP_FAILURE_RETRY (read_not_cancel (fd
, buf
, 2)) == 2
219 && buf
[0] >= '0' && buf
[0] <= '1')
220 retval
= buf
[0] - '0';
222 close_not_cancel_no_status (fd
);