Andrew Morton writes:

On Thu, 26 Apr 2007 23:33:32 +0530 "Amit K. Arora" [off-list ref] wrote:

quoted

This patch implements the fallocate() system call and adds support for
i386, x86_64 and powerpc.

...

+asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)

Please add a comment over this function which specifies its behaviour. 
Really it should be enough material from which a full manpage can be
written.

This looks like it will have the same problem on s390 as
sys_sync_file_range.  Maybe the prototype should be:

asmlinkage long sys_fallocate(loff_t offset, loff_t len, int fd, int mode)

Paul.