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-rw-r--r--xlators/features/metadisp/src/gen-fops.py160
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 0000000..8b5e120
--- /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])