1 files changed, 160 insertions, 0 deletions
diff --git a/xlators/features/metadisp/src/gen-fops.py b/xlators/features/metadisp/src/gen-fops.py
new file mode 100644
index 00000000000..8b5e120fdec
--- /dev/null
+++ b/xlators/features/metadisp/src/gen-fops.py
@@ -0,0 +1,160 @@
+#!/usr/bin/python
+
+import sys
+from generator import fop_subs, generate
+
+FN_METADATA_CHILD_GENERIC = """
+int32_t
+metadisp_@NAME@ (call_frame_t *frame, xlator_t *this,
+                 @LONG_ARGS@)
+{
+  METADISP_TRACE("@NAME@ metadata");
+  STACK_WIND (frame, default_@NAME@_cbk,
+              METADATA_CHILD(this), METADATA_CHILD(this)->fops->@NAME@,
+              @SHORT_ARGS@);
+  return 0;
+}
+"""
+
+FN_GENERIC_TEMPLATE = """
+int32_t
+metadisp_@NAME@ (call_frame_t *frame, xlator_t *this,
+                          @LONG_ARGS@)
+{
+  METADISP_TRACE("@NAME@ generic");
+  STACK_WIND (frame, default_@NAME@_cbk,
+                          DATA_CHILD(this), DATA_CHILD(this)->fops->@NAME@,
+                          @SHORT_ARGS@);
+  return 0;
+}
+"""
+
+FN_DATAFD_TEMPLATE = """
+int32_t
+metadisp_@NAME@ (call_frame_t *frame, xlator_t *this,
+                          @LONG_ARGS@)
+{
+  METADISP_TRACE("@NAME@ datafd");
+  xlator_t *child = NULL;
+  child = DATA_CHILD(this);
+  STACK_WIND (frame, default_@NAME@_cbk,
+                          child, child->fops->@NAME@,
+                          @SHORT_ARGS@);
+  return 0;
+}
+"""
+
+FN_DATALOC_TEMPLATE = """
+int32_t
+metadisp_@NAME@ (call_frame_t *frame, xlator_t *this,
+                          @LONG_ARGS@)
+{
+  METADISP_TRACE("@NAME@ dataloc");
+  loc_t backend_loc = {
+      0,
+  };
+  if (build_backend_loc(loc->gfid, loc, &backend_loc)) {
+      goto unwind;
+  }
+  xlator_t *child = NULL;
+  child = DATA_CHILD(this);
+  STACK_WIND (frame, default_@NAME@_cbk,
+                          child, child->fops->@NAME@,
+                          @SHORT_ARGS@);
+  return 0;
+
+unwind:
+  STACK_UNWIND_STRICT(lookup, frame, -1, EINVAL, NULL, NULL, NULL, NULL);
+  return 0;
+}
+"""
+
+FOPS_LINE_TEMPLATE = "\t.@NAME@ = metadisp_@NAME@,"
+
+skipped = [
+    "readdir",
+    "readdirp",
+    "lookup",
+    "fsync",
+    "stat",
+    "open",
+    "create",
+    "unlink",
+    "setattr",
+    # TODO: implement "inodelk",
+]
+
+
+def gen_fops():
+    done = skipped
+
+    #
+    # these are fops that wind to the DATA_CHILD
+    #
+    # NOTE: re-written in order from google doc:
+    #          https://docs.google.com/document/d/1KEwVtSNvDhs4qb63gWx2ulCp5GJjge77NGJk4p_Ms4Q
+    for name in [
+        "writev",
+        "readv",
+        "ftruncate",
+        "zerofill",
+        "discard",
+        "seek",
+        "fstat",
+    ]:
+        done = done + [name]
+        print(generate(FN_DATAFD_TEMPLATE, name, fop_subs))
+
+    for name in ["truncate"]:
+        done = done + [name]
+        print(generate(FN_DATALOC_TEMPLATE, name, fop_subs))
+
+    # these are fops that operate solely on dentries, folders,
+    # or extended attributes. Therefore, they must always
+    # wind to METADATA_CHILD and should never perform
+    # any path rewriting
+    #
+    # NOTE: re-written in order from google doc:
+    #          https://docs.google.com/document/d/1KEwVtSNvDhs4qb63gWx2ulCp5GJjge77NGJk4p_Ms4Q
+    for name in [
+        "mkdir",
+        "symlink",
+        "link",
+        "rename",
+        "mknod",
+        "opendir",
+        # "readdir,  # special-cased
+        # "readdirp, # special-cased
+        "fsyncdir",
+        # "setattr", # special-cased
+        "readlink",
+        "fentrylk",
+        "access",
+        # TODO: these wind to both,
+        # data for backend-attributes and metadata for the rest
+        "xattrop",
+        "setxattr",
+        "getxattr",
+        "removexattr",
+        "fgetxattr",
+        "fsetxattr",
+        "fremovexattr",
+    ]:
+
+        done = done + [name]
+        print(generate(FN_METADATA_CHILD_GENERIC, name, fop_subs))
+
+    print("struct xlator_fops fops = {")
+    for name in done:
+        print(generate(FOPS_LINE_TEMPLATE, name, fop_subs))
+
+    print("};")
+
+
+for l in open(sys.argv[1], "r").readlines():
+    if l.find("#pragma generate") != -1:
+        print("/* BEGIN GENERATED CODE - DO NOT MODIFY */")
+        gen_fops()
+        print("/* END GENERATED CODE */")
+    else:
+        print(l[:-1])