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[BZ #5778]

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* sysdeps/unix/sysv/linux/pathconf.h: Declare
	__statfs_chown_restricted.
	* sysdeps/unix/sysv/linux/fpathconf.c: Call __statfs_chown_restricted
	for _PC_CHOWN_RESTRICTED.
	* sysdeps/unix/sysv/linux/pathconf.c: Likewise.
	Implement __statfs_chown_restricted.
	* sysdeps/unix/sysv/linux/bits/posix_opt.h: Change
	_POSIX_CHOWN_RESTRICTED value to zero.

2008-02-26  Harsha Jagasia  <harsha.jagasia@amd.com>
This commit is contained in:
Ulrich Drepper
2008-03-08 01:57:18 +00:00
parent 78c2bf0eb4
commit 443db17889
9 changed files with 91 additions and 15 deletions
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48
sysdeps/unix/sysv/linux/pathconf.c
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@ -1,5 +1,5 @@
/* Get file-specific information about a file. Linux version.
Copyright (C) 1991,1995,1996,1998-2002,2003 Free Software Foundation, Inc.
Copyright (C) 1991,1995,1996,1998-2003,2008 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
@ -19,8 +19,10 @@
#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);
@ -46,6 +48,9 @@ __pathconf (const char *file, int name)
case _PC_2_SYMLINKS:
return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
case _PC_CHOWN_RESTRICTED:
return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf);
default:
return posix_pathconf (file, name);
}
@ -179,3 +184,44 @@ __statfs_symlinks (int result, const struct statfs *fsbuf)
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;
}