+++ /dev/null
-/*
- * OSD classes for the key value store
- *
- * Created on: Aug 10, 2012
- * Author: Eleanor Cawthon
- */
-
-#include "objclass/objclass.h"
-#include <errno.h>
-#include "key_value_store/kvs_arg_types.h"
-#include "include/types.h"
-#include <iostream>
-#include <climits>
-
-
-/**
- * finds the index_data where a key belongs.
- *
- * @param key: the key to search for
- * @param idata: the index_data for the first index value such that idata.key
- * is greater than key.
- * @param next_idata: the index_data for the next index entry after idata
- * @pre: key is not encoded
- * @post: idata contains complete information
- * stored
- */
-static int get_idata_from_key(cls_method_context_t hctx, const string &key,
- index_data &idata, index_data &next_idata) {
- bufferlist raw_val;
- int r = 0;
- std::map<std::string, bufferlist> kvmap;
-
- bool more;
-
- r = cls_cxx_map_get_vals(hctx, key_data(key).encoded(), "", 2, &kvmap, &more);
- if (r < 0) {
- CLS_LOG(20, "error reading index for range %s: %d", key.c_str(), r);
- return r;
- }
-
- r = cls_cxx_map_get_val(hctx, key_data(key).encoded(), &raw_val);
- if (r == 0){
- CLS_LOG(20, "%s is already in the index: %d", key.c_str(), r);
- bufferlist::iterator b = raw_val.begin();
- idata.decode(b);
- if (!kvmap.empty()) {
- bufferlist::iterator b = kvmap.begin()->second.begin();
- next_idata.decode(b);
- }
- return r;
- } else if (r == -ENOENT || r == -ENODATA) {
- bufferlist::iterator b = kvmap.begin()->second.begin();
- idata.decode(b);
- if (idata.kdata.prefix != "1") {
- bufferlist::iterator nb = (++kvmap.begin())->second.begin();
- next_idata.decode(nb);
- }
- r = 0;
- } else if (r < 0) {
- CLS_LOG(20, "error reading index for duplicates %s: %d", key.c_str(), r);
- return r;
- }
-
- CLS_LOG(20, "idata is %s", idata.str().c_str());
- return r;
-}
-
-
-static int get_idata_from_key_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "get_idata_from_key_op");
- idata_from_key_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- CLS_LOG(20, "error decoding idata_from_key_args.");
- return -EINVAL;
- }
- int r = get_idata_from_key(hctx, op.key, op.idata, op.next_idata);
- if (r < 0) {
- return r;
- } else {
- ::encode(op, *out);
- return 0;
- }
-}
-
-/**
- * finds the object in the index with the lowest key value that is greater
- * than idata.key. If idata.key is the max key, returns -EOVERFLOW. If
- * idata has a prefix and has timed out, cleans up.
- *
- * @param idata: idata for the object to search for.
- * @param out_data: the idata for the next object.
- *
- * @pre: idata must contain a key.
- * @post: out_data contains complete information
- */
-static int get_next_idata(cls_method_context_t hctx, const index_data &idata,
- index_data &out_data) {
- int r = 0;
- std::map<std::string, bufferlist> kvs;
- bool more;
- r = cls_cxx_map_get_vals(hctx, idata.kdata.encoded(), "", 1, &kvs, &more);
- if (r < 0){
- CLS_LOG(20, "getting kvs failed with error %d", r);
- return r;
- }
-
- if (!kvs.empty()) {
- out_data.kdata.parse(kvs.begin()->first);
- bufferlist::iterator b = kvs.begin()->second.begin();
- out_data.decode(b);
- } else {
- r = -EOVERFLOW;
- }
-
- return r;
-}
-
-static int get_next_idata_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "get_next_idata_op");
- idata_from_idata_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- int r = get_next_idata(hctx, op.idata, op.next_idata);
- if (r < 0) {
- return r;
- } else {
- op.encode(*out);
- return 0;
- }
-}
-
-/**
- * finds the object in the index with the highest key value that is less
- * than idata.key. If idata.key is the lowest key, returns -ERANGE If
- * idata has a prefix and has timed out, cleans up.
- *
- * @param idata: idata for the object to search for.
- * @param out_data: the idata for the next object.
- *
- * @pre: idata must contain a key.
- * @ost: out_data contains complete information
- */
-static int get_prev_idata(cls_method_context_t hctx, const index_data &idata,
- index_data &out_data) {
- int r = 0;
- std::map<std::string, bufferlist> kvs;
- bool more;
- r = cls_cxx_map_get_vals(hctx, "", "", LONG_MAX, &kvs, &more);
- if (r < 0){
- CLS_LOG(20, "getting kvs failed with error %d", r);
- return r;
- }
-
- std::map<std::string, bufferlist>::iterator it =
- kvs.lower_bound(idata.kdata.encoded());
- if (it->first != idata.kdata.encoded()) {
- CLS_LOG(20, "object %s not found in the index (expected %s, found %s)",
- idata.str().c_str(), idata.kdata.encoded().c_str(),
- it->first.c_str());
- return -ENODATA;
- }
- if (it == kvs.begin()) {
- //it is the first object, there is no previous.
- return -ERANGE;
- } else {
- --it;
- }
- out_data.kdata.parse(it->first);
- bufferlist::iterator b = it->second.begin();
- out_data.decode(b);
-
- return 0;
-}
-
-static int get_prev_idata_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "get_next_idata_op");
- idata_from_idata_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- int r = get_prev_idata(hctx, op.idata, op.next_idata);
- if (r < 0) {
- return r;
- } else {
- op.encode(*out);
- return 0;
- }
-}
-
-/**
- * Read all of the index entries where any keys in the map go
- */
-static int read_many(cls_method_context_t hctx, const set<string> &keys,
- map<string, bufferlist> * out) {
- int r = 0;
- bool more;
- CLS_ERR("reading from a map of size %d, first key encoded is %s",
- (int)keys.size(), key_data(*keys.begin()).encoded().c_str());
- r = cls_cxx_map_get_vals(hctx, key_data(*keys.begin()).encoded().c_str(),
- "", LONG_MAX, out, &more);
- if (r < 0) {
- CLS_ERR("getting omap vals failed with error %d", r);
- }
-
- CLS_ERR("got map of size %d ", (int)out->size());
- if (out->size() > 1) {
- out->erase(out->upper_bound(key_data(*keys.rbegin()).encoded().c_str()),
- out->end());
- }
- CLS_ERR("returning map of size %d", (int)out->size());
- return r;
-}
-
-static int read_many_op(cls_method_context_t hctx, bufferlist *in,
- bufferlist *out) {
- CLS_LOG(20, "read_many_op");
- set<string> op;
- map<string, bufferlist> outmap;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error & err) {
- return -EINVAL;
- }
- int r = read_many(hctx, op, &outmap);
- if (r < 0) {
- return r;
- } else {
- encode(outmap, *out);
- return 0;
- }
-}
-
-/**
- * Checks the unwritable xattr. If it is "1" (i.e., it is unwritable), returns
- * -EACCES. otherwise, returns 0.
- */
-static int check_writable(cls_method_context_t hctx) {
- bufferlist bl;
- int r = cls_cxx_getxattr(hctx, "unwritable", &bl);
- if (r < 0) {
- CLS_LOG(20, "error reading xattr %s: %d", "unwritable", r);
- return r;
- }
- if (string(bl.c_str(), bl.length()) == "1") {
- return -EACCES;
- } else{
- return 0;
- }
-}
-
-static int check_writable_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "check_writable_op");
- return check_writable(hctx);
-}
-
-/**
- * returns -EKEYREJECTED if size is outside of bound, according to comparator.
- *
- * @bound: the limit to test
- * @comparator: should be CEPH_OSD_CMPXATTR_OP_[EQ|GT|LT]
- */
-static int assert_size_in_bound(cls_method_context_t hctx, int bound,
- int comparator) {
- //determine size
- bufferlist size_bl;
- int r = cls_cxx_getxattr(hctx, "size", &size_bl);
- if (r < 0) {
- CLS_LOG(20, "error reading xattr %s: %d", "size", r);
- return r;
- }
-
- int size = atoi(string(size_bl.c_str(), size_bl.length()).c_str());
- CLS_LOG(20, "size is %d, bound is %d", size, bound);
-
- //compare size to comparator
- switch (comparator) {
- case CEPH_OSD_CMPXATTR_OP_EQ:
- if (size != bound) {
- return -EKEYREJECTED;
- }
- break;
- case CEPH_OSD_CMPXATTR_OP_LT:
- if (size >= bound) {
- return -EKEYREJECTED;
- }
- break;
- case CEPH_OSD_CMPXATTR_OP_GT:
- if (size <= bound) {
- return -EKEYREJECTED;
- }
- break;
- default:
- CLS_LOG(20, "invalid argument passed to assert_size_in_bound: %d",
- comparator);
- return -EINVAL;
- }
- return 0;
-}
-
-static int assert_size_in_bound_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "assert_size_in_bound_op");
- assert_size_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- return assert_size_in_bound(hctx, op.bound, op.comparator);
-}
-
-/**
- * Attempts to insert omap into this object's omap.
- *
- * @return:
- * if unwritable, returns -EACCES.
- * if size > bound and key doesn't already exist in the omap, returns -EBALANCE.
- * if exclusive is true, returns -EEXIST if any keys already exist.
- *
- * @post: object has omap entries inserted, and size xattr is updated
- */
-static int omap_insert(cls_method_context_t hctx,
- const map<string, bufferlist> &omap, int bound, bool exclusive) {
-
- uint64_t size;
- time_t time;
- int r = cls_cxx_stat(hctx, &size, &time);
- if (r < 0) {
- return r;
- }
- CLS_LOG(20, "inserting %s", omap.begin()->first.c_str());
- r = check_writable(hctx);
- if (r < 0) {
- CLS_LOG(20, "omap_insert: this object is unwritable: %d", r);
- return r;
- }
-
- int assert_bound = bound;
-
- //if this is an exclusive insert, make sure the key doesn't already exist.
- for (map<string, bufferlist>::const_iterator it = omap.begin();
- it != omap.end(); ++it) {
- bufferlist bl;
- r = cls_cxx_map_get_val(hctx, it->first, &bl);
- if (r == 0 && string(bl.c_str(), bl.length()) != ""){
- if (exclusive) {
- CLS_LOG(20, "error: this is an exclusive insert and %s exists.",
- it->first.c_str());
- return -EEXIST;
- }
- assert_bound++;
- CLS_LOG(20, "increased assert_bound to %d", assert_bound);
- } else if (r != -ENODATA && r != -ENOENT) {
- CLS_LOG(20, "error reading omap val for %s: %d", it->first.c_str(), r);
- return r;
- }
- }
-
- bufferlist old_size;
- r = cls_cxx_getxattr(hctx, "size", &old_size);
- if (r < 0) {
- CLS_LOG(20, "error reading xattr %s: %d", "size", r);
- return r;
- }
-
- int old_size_int = atoi(string(old_size.c_str(), old_size.length()).c_str());
-
- CLS_LOG(20, "asserting size is less than %d (bound is %d)", assert_bound, bound);
- if (old_size_int >= assert_bound) {
- return -EKEYREJECTED;
- }
-
- int new_size_int = old_size_int + omap.size() - (assert_bound - bound);
- CLS_LOG(20, "old size is %d, new size is %d", old_size_int, new_size_int);
- bufferlist new_size;
- stringstream s;
- s << new_size_int;
- new_size.append(s.str());
-
- r = cls_cxx_map_set_vals(hctx, &omap);
- if (r < 0) {
- CLS_LOG(20, "error setting omap: %d", r);
- return r;
- }
-
- r = cls_cxx_setxattr(hctx, "size", &new_size);
- if (r < 0) {
- CLS_LOG(20, "error setting xattr %s: %d", "size", r);
- return r;
- }
- CLS_LOG(20, "successfully inserted %s", omap.begin()->first.c_str());
- return 0;
-}
-
-static int omap_insert_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "omap_insert");
- omap_set_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- return omap_insert(hctx, op.omap, op.bound, op.exclusive);
-}
-
-static int create_with_omap(cls_method_context_t hctx,
- const map<string, bufferlist> &omap) {
- CLS_LOG(20, "creating with omap: %s", omap.begin()->first.c_str());
- //first make sure the object is writable
- int r = cls_cxx_create(hctx, true);
- if (r < 0) {
- CLS_LOG(20, "omap create: creating failed: %d", r);
- return r;
- }
-
- int new_size_int = omap.size();
- CLS_LOG(20, "omap insert: new size is %d", new_size_int);
- bufferlist new_size;
- stringstream s;
- s << new_size_int;
- new_size.append(s.str());
-
- r = cls_cxx_map_set_vals(hctx, &omap);
- if (r < 0) {
- CLS_LOG(20, "omap create: error setting omap: %d", r);
- return r;
- }
-
- r = cls_cxx_setxattr(hctx, "size", &new_size);
- if (r < 0) {
- CLS_LOG(20, "omap create: error setting xattr %s: %d", "size", r);
- return r;
- }
-
- bufferlist u;
- u.append("0");
- r = cls_cxx_setxattr(hctx, "unwritable", &u);
- if (r < 0) {
- CLS_LOG(20, "omap create: error setting xattr %s: %d", "unwritable", r);
- return r;
- }
-
- CLS_LOG(20, "successfully created %s", omap.begin()->first.c_str());
- return 0;
-}
-
-static int create_with_omap_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "omap_insert");
- map<string, bufferlist> omap;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(omap, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- return create_with_omap(hctx, omap);
-}
-
-/**
- * Attempts to remove omap from this object's omap.
- *
- * @return:
- * if unwritable, returns -EACCES.
- * if size < bound and key doesn't already exist in the omap, returns -EBALANCE.
- * if any of the keys are not in this object, returns -ENODATA.
- *
- * @post: object has omap entries removed, and size xattr is updated
- */
-static int omap_remove(cls_method_context_t hctx,
- const std::set<string> &omap, int bound) {
- int r;
- uint64_t size;
- time_t time;
- r = cls_cxx_stat(hctx, &size, &time);
- if (r < 0) {
- return r;
- }
-
- //first make sure the object is writable
- r = check_writable(hctx);
- if (r < 0) {
- return r;
- }
-
- //check for existance of the key first
- for (set<string>::const_iterator it = omap.begin();
- it != omap.end(); ++it) {
- bufferlist bl;
- r = cls_cxx_map_get_val(hctx, *it, &bl);
- if (r == -ENOENT || r == -ENODATA
- || string(bl.c_str(), bl.length()) == ""){
- return -ENODATA;
- } else if (r < 0) {
- CLS_LOG(20, "error reading omap val for %s: %d", it->c_str(), r);
- return r;
- }
- }
-
- //fail if removing from an object with only bound entries.
- bufferlist old_size;
- r = cls_cxx_getxattr(hctx, "size", &old_size);
- if (r < 0) {
- CLS_LOG(20, "error reading xattr %s: %d", "size", r);
- return r;
- }
- int old_size_int = atoi(string(old_size.c_str(), old_size.length()).c_str());
-
- CLS_LOG(20, "asserting size is greater than %d", bound);
- if (old_size_int <= bound) {
- return -EKEYREJECTED;
- }
-
- int new_size_int = old_size_int - omap.size();
- CLS_LOG(20, "old size is %d, new size is %d", old_size_int, new_size_int);
- bufferlist new_size;
- stringstream s;
- s << new_size_int;
- new_size.append(s.str());
-
- r = cls_cxx_setxattr(hctx, "size", &new_size);
- if (r < 0) {
- CLS_LOG(20, "error setting xattr %s: %d", "unwritable", r);
- return r;
- }
-
- for (std::set<string>::const_iterator it = omap.begin();
- it != omap.end(); ++it) {
- r = cls_cxx_map_remove_key(hctx, *it);
- if (r < 0) {
- CLS_LOG(20, "error removing omap: %d", r);
- return r;
- }
- }
- return 0;
-}
-
-static int omap_remove_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "omap_remove");
- omap_rm_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- return omap_remove(hctx, op.omap, op.bound);
-}
-
-/**
- * checks to see if this object needs to be split or rebalanced. if so, reads
- * information about it.
- *
- * @post: if assert_size_in_bound(hctx, bound, comparator) succeeds,
- * odata contains the size, omap, and unwritable attributes for this object.
- * Otherwise, odata contains the size and unwritable attribute.
- */
-static int maybe_read_for_balance(cls_method_context_t hctx,
- object_data &odata, int bound, int comparator) {
- CLS_LOG(20, "rebalance reading");
- //if unwritable, return
- int r = check_writable(hctx);
- if (r < 0) {
- odata.unwritable = true;
- CLS_LOG(20, "rebalance read: error getting xattr %s: %d", "unwritable", r);
- return r;
- } else {
- odata.unwritable = false;
- }
-
- //get the size attribute
- bufferlist size;
- r = cls_cxx_getxattr(hctx, "size", &size);
- if (r < 0) {
- CLS_LOG(20, "rebalance read: error getting xattr %s: %d", "size", r);
- return r;
- }
- odata.size = atoi(string(size.c_str(), size.length()).c_str());
-
- //check if it needs to be balanced
- r = assert_size_in_bound(hctx, bound, comparator);
- if (r < 0) {
- CLS_LOG(20, "rebalance read: error on asserting size: %d", r);
- return -EBALANCE;
- }
-
- //if the assert succeeded, it needs to be balanced
- bool more;
- r = cls_cxx_map_get_vals(hctx, "", "", LONG_MAX, &odata.omap, &more);
- if (r < 0){
- CLS_LOG(20, "rebalance read: getting kvs failed with error %d", r);
- return r;
- }
-
- CLS_LOG(20, "rebalance read: size xattr is %llu, omap size is %llu",
- (unsigned long long)odata.size,
- (unsigned long long)odata.omap.size());
- return 0;
-}
-
-static int maybe_read_for_balance_op(cls_method_context_t hctx,
- bufferlist *in, bufferlist *out) {
- CLS_LOG(20, "maybe_read_for_balance");
- rebalance_args op;
- bufferlist::iterator it = in->begin();
- try {
- ::decode(op, it);
- } catch (buffer::error& err) {
- return -EINVAL;
- }
- int r = maybe_read_for_balance(hctx, op.odata, op.bound, op.comparator);
- if (r < 0) {
- return r;
- } else {
- op.encode(*out);
- return 0;
- }
-}
-
-
-CLS_INIT(kvs)
-{
- CLS_LOG(20, "Loaded assert condition class!");
-
- cls_handle_t h_class;
- cls_method_handle_t h_get_idata_from_key;
- cls_method_handle_t h_get_next_idata;
- cls_method_handle_t h_get_prev_idata;
- cls_method_handle_t h_read_many;
- cls_method_handle_t h_check_writable;
- cls_method_handle_t h_assert_size_in_bound;
- cls_method_handle_t h_omap_insert;
- cls_method_handle_t h_create_with_omap;
- cls_method_handle_t h_omap_remove;
- cls_method_handle_t h_maybe_read_for_balance;
-
- cls_register("kvs", &h_class);
- cls_register_cxx_method(h_class, "get_idata_from_key",
- CLS_METHOD_RD,
- get_idata_from_key_op, &h_get_idata_from_key);
- cls_register_cxx_method(h_class, "get_next_idata",
- CLS_METHOD_RD,
- get_next_idata_op, &h_get_next_idata);
- cls_register_cxx_method(h_class, "get_prev_idata",
- CLS_METHOD_RD,
- get_prev_idata_op, &h_get_prev_idata);
- cls_register_cxx_method(h_class, "read_many",
- CLS_METHOD_RD,
- read_many_op, &h_read_many);
- cls_register_cxx_method(h_class, "check_writable",
- CLS_METHOD_RD | CLS_METHOD_WR,
- check_writable_op, &h_check_writable);
- cls_register_cxx_method(h_class, "assert_size_in_bound",
- CLS_METHOD_WR,
- assert_size_in_bound_op, &h_assert_size_in_bound);
- cls_register_cxx_method(h_class, "omap_insert",
- CLS_METHOD_WR,
- omap_insert_op, &h_omap_insert);
- cls_register_cxx_method(h_class, "create_with_omap",
- CLS_METHOD_WR,
- create_with_omap_op, &h_create_with_omap);
- cls_register_cxx_method(h_class, "omap_remove",
- CLS_METHOD_WR,
- omap_remove_op, &h_omap_remove);
- cls_register_cxx_method(h_class, "maybe_read_for_balance",
- CLS_METHOD_RD,
- maybe_read_for_balance_op, &h_maybe_read_for_balance);
-
- return;
-}
Code Review / stor4nfv.git / blobdiff