sysdeps/unix/sysv/linux/posix_fallocate64.c

   1 /* Copyright (C) 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <fcntl.h>
  20 #include <kernel-features.h>
  21 #include <sysdep.h>
  22
  23 extern int __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len);
  24 #define __posix_fallocate64_l64 static internal_fallocate64
  25 #include <sysdeps/posix/posix_fallocate64.c>
  26 #undef __posix_fallocate64_l64
  27
  28 #if !defined __ASSUME_FALLOCATE && defined __NR_fallocate
  29 /* Defined in posix_fallocate.c.  */
  30 extern int __have_fallocate attribute_hidden;
  31 #endif
  32
  33
  34 /* Reserve storage for the data of the file associated with FD.  */
  35 int
  36 __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
  37 {
  38 #ifdef __NR_fallocate
  39 # ifndef __ASSUME_FALLOCATE
  40   if (__builtin_expect (__have_fallocate >= 0, 1))
  41 # endif
  42     {
  43       INTERNAL_SYSCALL_DECL (err);
  44       int res = INTERNAL_SYSCALL (fallocate, err, 6, fd, 0,
  45                                   __LONG_LONG_PAIR ((long int) (offset >> 32),
  46                                                     (long int) offset),
  47                                   __LONG_LONG_PAIR ((long int) (len >> 32),
  48                                                     (long int) len));
  49
  50       if (! INTERNAL_SYSCALL_ERROR_P (res, err))
  51         return 0;
  52
  53 # ifndef __ASSUME_FALLOCATE
  54       if (__builtin_expect (INTERNAL_SYSCALL_ERRNO (res, err) == ENOSYS, 0))
  55         __have_fallocate = -1;
  56       else
  57 # endif
  58         if (INTERNAL_SYSCALL_ERRNO (res, err) != EOPNOTSUPP)
  59           return INTERNAL_SYSCALL_ERRNO (res, err);
  60     }
  61 #endif
  62
  63   return internal_fallocate64 (fd, offset, len);
  64 }