Description of problem:

RHEL7's kernel supports the fallocate() call and its various flags, such as FALLOC_FL_PUNCH_HOLE.  Likewise the man page for fallocate(2) lists this option and says <fcntl.h> should give you the necessary definitions.

However, while FALLOC_FL_PUNCH_HOLE (and other fallocate() flags) is included in /usr/include/linux/falloc.h (supplied by the kernel), that file is not included, directly or indirectly by /usr/include/fcntl.h

Version-Release number of selected component (if applicable):

glibc-2.17-196.el7.ppc64le
kernel-3.10.0-693.el7.ppc64le

How reproducible:

100%

Steps to Reproduce:
1. Create fallocate.c:

#define _GNU_SOURCE

#include <fcntl.h>

int test(int fd)
{
	return fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
			 0, 1024 * 1024);
}

2. Compile source file above with:

    $ gcc -Wall -c fallocate.c

Actual results:

$ gcc -c fallocate.c 
fallocate.c: In function ‘test’:
fallocate.c:7:23: error: ‘FALLOC_FL_PUNCH_HOLE’ undeclared (first use in this function)
  return fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
                       ^
fallocate.c:7:23: note: each undeclared identifier is reported only once for each function it appears in
fallocate.c:7:46: error: ‘FALLOC_FL_KEEP_SIZE’ undeclared (first use in this function)
  return fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
                                              ^

Expected results:

File compiles successfully.

Additional info:

This works correctly in Fedora 26 (and therefore, presumably, in upstream glibc).  In Fedora, fcntl.h indirectly includes linux/falloc.h via bits/fcntl-linux.h.