[Bugs] [Bug 1361249] New: posix: leverage FALLOC_FL_ZERO_RANGE in zerofill fop

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1361249

            Bug ID: 1361249
           Summary: posix: leverage FALLOC_FL_ZERO_RANGE in zerofill fop
           Product: GlusterFS
           Version: mainline
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org



posix_zerofill() implements zerofilling of a given (offset,length) by
    doing a writev in a loop followed by an optional fsync on the file.
    fallocate(2) has a FALLOC_FL_ZERO_RANGE flag which does away with all
    this and provides the same result (from a userspace application point of
    view) with a single syscall. This patch attempts the zerofill with the
    latter and falls back to the former if it fails.

    Tested using a libgfapi based C program on XFS and observed using gdb that
    posix_zerofill()'s call to fallocate with FALLOC_FL_ZERO_RANGE was a
    success.

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