Brian Foster 17f2871724 glusterfs: discard (hole punch) support
Add support for the DISCARD file operation. Discard punches a hole
in a file in the provided range. Block de-allocation is implemented
via fallocate() (as requested via fuse and passed on to the brick
fs) but a separate fop is created within gluster to emphasize the
fact that discard changes file data (the discarded region is
replaced with zeroes) and must invalidate caches where appropriate.

BUG: 963678
Change-Id: I34633a0bfff2187afeab4292a15f3cc9adf261af
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-on: http://review.gluster.org/5090
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>
2013-06-13 14:37:43 -07:00
..
2012-07-18 12:12:25 -07:00
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This is an example application which uses libgfapi. It is
a complete autotools based build system which demonstrates the
required changes in configure.ac, Makefile.am etc to successfuly
detect for and build an application against libgfapi.

There are two approaches to building a libgfapi based application:

1. In the presence of pkg-config in your build system.
This is the recommended approach which is also used in this example.
For this approach to work, you need to build glusterfs by passing
--pkgconfigdir=/usr/lib64/pkgconfig (or the appropriate directory)
in your distro. This already happens if you build RPMs with the
glusterfs.spec provided in glusterfs.git. You will also need to
install glusterfs-api RPM.

2. In the absence of pkg-config in your build system.
Make sure your LDFLAGS includes -L/path/to/lib where libgfapi.so is
installed and -I/path/to/include/glusterfs where the 'api' directory
containing the headers are available.