md-cache: meta-data caching translator

This is a metadata caching translator which is well integrated with
glusterfs core framework and leverages some of the recent protocol
changes to do a better job at caching.

- It uses the attributes returned along callbacks of all calls to
  update its attribute cache as frequently as possible without
  issuing calls on its own (i.e, very low overhead)

- It caches attributes returned via readdirp into the inode contexts
  corresponding to those entries (i.e, well integrated)

- It caches and updates xattrs and not just inode attributes (i.e,
  eliminates the need for a separate xattr-prefetch translator)

In its current form it has a timeout based consistency model

Change-Id: I891f6225c1a4c08bb111e287571d5f6d326dbe97
BUG: 765785
Reviewed-on: http://review.gluster.com/2713
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/xlators/performance/md-cache/src/Makefile.am b/xlators/performance/md-cache/src/Makefile.am
new file mode 100644
index 000000000..6031c223f
--- /dev/null
+++ b/xlators/performance/md-cache/src/Makefile.am
@@ -0,0 +1,14 @@
+xlator_LTLIBRARIES = md-cache.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
+
+md_cache_la_LDFLAGS = -module -avoidversion
+
+md_cache_la_SOURCES = md-cache.c
+md_cache_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = md-cache-mem-types.h
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+	-I$(top_srcdir)/libglusterfs/src -I$(CONTRIBDIR)/rbtree -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES =