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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <errno.h>
#include "objclass/objclass.h"
#include "cls_cas_ops.h"
#include "cls_cas_internal.h"
#include "include/compat.h"
#include "osd/osd_types.h"
using ceph::bufferlist;
using ceph::decode;
CLS_VER(1,0)
CLS_NAME(cas)
//
// helpers
//
static int chunk_read_refcount(
cls_method_context_t hctx,
chunk_refs_t *objr)
{
bufferlist bl;
objr->clear();
int ret = cls_cxx_getxattr(hctx, CHUNK_REFCOUNT_ATTR, &bl);
if (ret == -ENODATA) {
return 0;
}
if (ret < 0)
return ret;
try {
auto iter = bl.cbegin();
decode(*objr, iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(0, "ERROR: chunk_read_refcount(): failed to decode refcount entry\n");
return -EIO;
}
return 0;
}
static int chunk_set_refcount(
cls_method_context_t hctx,
const struct chunk_refs_t& objr)
{
bufferlist bl;
encode(objr, bl);
int ret = cls_cxx_setxattr(hctx, CHUNK_REFCOUNT_ATTR, &bl);
if (ret < 0)
return ret;
return 0;
}
//
// methods
//
static int chunk_create_or_get_ref(cls_method_context_t hctx,
bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_cas_chunk_create_or_get_ref_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: failed to decode entry\n");
return -EINVAL;
}
chunk_refs_t objr;
int ret = chunk_read_refcount(hctx, &objr);
if (ret == -ENOENT) {
// new chunk; init refs
CLS_LOG(10, "create oid=%s\n",
op.source.oid.name.c_str());
ret = cls_cxx_write_full(hctx, &op.data);
if (ret < 0) {
return ret;
}
objr.get(op.source);
ret = chunk_set_refcount(hctx, objr);
if (ret < 0) {
return ret;
}
} else if (ret < 0) {
return ret;
} else {
// existing chunk; inc ref
if (op.flags & cls_cas_chunk_create_or_get_ref_op::FLAG_VERIFY) {
bufferlist old;
cls_cxx_read(hctx, 0, 0, &old);
if (!old.contents_equal(op.data)) {
return -ENOMSG;
}
}
CLS_LOG(10, "inc ref oid=%s\n",
op.source.oid.name.c_str());
objr.get(op.source);
ret = chunk_set_refcount(hctx, objr);
if (ret < 0) {
return ret;
}
}
return 0;
}
static int chunk_get_ref(cls_method_context_t hctx,
bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_cas_chunk_get_ref_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: failed to decode entry\n");
return -EINVAL;
}
chunk_refs_t objr;
int ret = chunk_read_refcount(hctx, &objr);
if (ret < 0) {
CLS_LOG(1, "ERROR: failed to read attr\n");
return ret;
}
// existing chunk; inc ref
CLS_LOG(10, "oid=%s\n", op.source.oid.name.c_str());
objr.get(op.source);
ret = chunk_set_refcount(hctx, objr);
if (ret < 0) {
return ret;
}
return 0;
}
static int chunk_put_ref(cls_method_context_t hctx,
bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_cas_chunk_put_ref_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: failed to decode entry\n");
return -EINVAL;
}
chunk_refs_t objr;
int ret = chunk_read_refcount(hctx, &objr);
if (ret < 0)
return ret;
if (!objr.put(op.source)) {
CLS_LOG(10, "oid=%s (no ref)\n", op.source.oid.name.c_str());
return -ENOLINK;
}
if (objr.empty()) {
CLS_LOG(10, "oid=%s (last ref)\n", op.source.oid.name.c_str());
return cls_cxx_remove(hctx);
}
CLS_LOG(10, "oid=%s (dec)\n", op.source.oid.name.c_str());
ret = chunk_set_refcount(hctx, objr);
if (ret < 0)
return ret;
return 0;
}
static int references_chunk(cls_method_context_t hctx,
bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
std::string fp_oid;
bufferlist indata, outdata;
try {
decode (fp_oid, in_iter);
}
catch (ceph::buffer::error& e) {
return -EINVAL;
}
CLS_LOG(10, "fp_oid: %s \n", fp_oid.c_str());
int ret = cls_get_manifest_ref_count(hctx, fp_oid);
if (ret) {
return ret;
}
return -ENOLINK;
}
CLS_INIT(cas)
{
CLS_LOG(1, "Loaded cas class!");
cls_handle_t h_class;
cls_method_handle_t h_chunk_create_or_get_ref;
cls_method_handle_t h_chunk_get_ref;
cls_method_handle_t h_chunk_put_ref;
cls_method_handle_t h_references_chunk;
cls_register("cas", &h_class);
cls_register_cxx_method(h_class, "chunk_create_or_get_ref",
CLS_METHOD_RD | CLS_METHOD_WR,
chunk_create_or_get_ref,
&h_chunk_create_or_get_ref);
cls_register_cxx_method(h_class, "chunk_get_ref",
CLS_METHOD_RD | CLS_METHOD_WR,
chunk_get_ref,
&h_chunk_get_ref);
cls_register_cxx_method(h_class, "chunk_put_ref",
CLS_METHOD_RD | CLS_METHOD_WR,
chunk_put_ref,
&h_chunk_put_ref);
cls_register_cxx_method(h_class, "references_chunk", CLS_METHOD_RD,
references_chunk,
&h_references_chunk);
return;
}
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