sysdeps/unix/sysv/linux/posix_fallocate64.c

   1 /* Copyright (C) 2007-2014 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <fcntl.h>
  19 #include <kernel-features.h>
  20 #include <sysdep.h>
  21
  22 extern int __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len);
  23 #define __posix_fallocate64_l64 static internal_fallocate64
  24 #include <sysdeps/posix/posix_fallocate64.c>
  25 #undef __posix_fallocate64_l64
  26
  27 #if !defined __ASSUME_FALLOCATE && defined __NR_fallocate
  28 /* Defined in posix_fallocate.c.  */
  29 extern int __have_fallocate attribute_hidden;
  30 #endif
  31
  32
  33 /* Reserve storage for the data of the file associated with FD.  */
  34 int
  35 __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
  36 {
  37 #ifdef __NR_fallocate
  38 # ifndef __ASSUME_FALLOCATE
  39   if (__glibc_likely (__have_fallocate >= 0))
  40 # endif
  41     {
  42       INTERNAL_SYSCALL_DECL (err);
  43       int res = INTERNAL_SYSCALL (fallocate, err, 6, fd, 0,
  44                                   __LONG_LONG_PAIR ((long int) (offset >> 32),
  45                                                     (long int) offset),
  46                                   __LONG_LONG_PAIR ((long int) (len >> 32),
  47                                                     (long int) len));
  48
  49       if (! INTERNAL_SYSCALL_ERROR_P (res, err))
  50         return 0;
  51
  52 # ifndef __ASSUME_FALLOCATE
  53       if (__glibc_unlikely (INTERNAL_SYSCALL_ERRNO (res, err) == ENOSYS))
  54         __have_fallocate = -1;
  55       else
  56 # endif
  57         if (INTERNAL_SYSCALL_ERRNO (res, err) != EOPNOTSUPP)
  58           return INTERNAL_SYSCALL_ERRNO (res, err);
  59     }
  60 #endif
  61
  62   return internal_fallocate64 (fd, offset, len);
  63 }