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authorSheena Artrip <sheenobu@fb.com>2020-01-29 15:12:17 -0800
committerAmar Tumballi <amar@kadalu.io>2020-08-21 14:11:23 +0000
commiteddbf3a23392ca47a697779167c61b4ab790732b (patch)
tree5620c0720940b56b59df68f914c5af3ab1ba6a1e /xlators/features/metadisp/src/metadisp.h
parentbe20c051a14a15738c3bcab71698e60895e1baba (diff)
metadisp: new translator for data and metadata separation
Summary: feature/metadisp is an xlator for performing "metadata dispersal" across multiple children. it does this by flattening the complex POSIX paths into /$GFID style paths, then forwarding the metadata operations to its first child and forwarding the data operations to its second child. The purpose of this xlator is to allow separation of data and metadata, in cases where metadata might be stored in another format (embedded kv?), on another disk (ssd), on another host (dht2). Change-Id: I392c8bd0c867a3237d144aea327323f700a2728d Updates: #816 Signed-Off-By: Sheena Artrip <sheenobu@fb.com> Tested-By: Amar Tumballi <amar@kadalu.io>
Diffstat (limited to 'xlators/features/metadisp/src/metadisp.h')
-rw-r--r--xlators/features/metadisp/src/metadisp.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/xlators/features/metadisp/src/metadisp.h b/xlators/features/metadisp/src/metadisp.h
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index 00000000000..c8fd7a13c04
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+++ b/xlators/features/metadisp/src/metadisp.h
@@ -0,0 +1,45 @@
+/*
+ Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+*/
+#ifndef GF_METADISP_H_
+#define GF_METADISP_H_
+
+#include <glusterfs/glusterfs.h>
+#include <glusterfs/logging.h>
+#include <glusterfs/dict.h>
+#include <glusterfs/xlator.h>
+#include <glusterfs/defaults.h>
+
+#define METADATA_CHILD(_this) FIRST_CHILD(_this)
+#define DATA_CHILD(_this) SECOND_CHILD(_this)
+
+int32_t
+build_backend_loc(uuid_t gfid, loc_t *src_loc, loc_t *dst_loc);
+
+#define METADISP_TRACE(_args...) gf_log("metadisp", GF_LOG_INFO, _args)
+
+#define METADISP_FILTER_ROOT(_op, _args...) \
+ if (strcmp(loc->path, "/") == 0) { \
+ STACK_WIND(frame, default_##_op##_cbk, METADATA_CHILD(this), \
+ METADATA_CHILD(this)->fops->_op, _args); \
+ return 0; \
+ }
+
+#define METADISP_FILTER_ROOT_BY_GFID(_op, _gfid, _args...) \
+ if (__is_root_gfid(_gfid)) { \
+ STACK_WIND(frame, default_##_op##_cbk, METADATA_CHILD(this), \
+ METADATA_CHILD(this)->fops->_op, _args); \
+ return 0; \
+ }
+
+#define RESOLVE_GFID_REQ(_dict, _dest, _lbl) \
+ VALIDATE_OR_GOTO(dict_get_ptr(_dict, "gfid-req", (void **)&_dest) == 0, \
+ _lbl)
+
+#endif /* __TEMPLATE_H__ */