diff options
Diffstat (limited to 'src/librbd/internal.cc')
| -rw-r--r-- | src/librbd/internal.cc | 1750 |
1 files changed, 1750 insertions, 0 deletions
diff --git a/src/librbd/internal.cc b/src/librbd/internal.cc new file mode 100644 index 000000000..f9ba5474b --- /dev/null +++ b/src/librbd/internal.cc @@ -0,0 +1,1750 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +#include "include/int_types.h" + +#include <errno.h> +#include <limits.h> + +#include "include/types.h" +#include "include/uuid.h" +#include "common/ceph_context.h" +#include "common/dout.h" +#include "common/errno.h" +#include "common/Throttle.h" +#include "common/event_socket.h" +#include "common/perf_counters.h" +#include "osdc/Striper.h" +#include "include/stringify.h" + +#include "cls/lock/cls_lock_client.h" +#include "cls/rbd/cls_rbd.h" +#include "cls/rbd/cls_rbd_types.h" +#include "cls/rbd/cls_rbd_client.h" +#include "cls/journal/cls_journal_types.h" +#include "cls/journal/cls_journal_client.h" + +#include "librbd/AsioEngine.h" +#include "librbd/ExclusiveLock.h" +#include "librbd/ImageCtx.h" +#include "librbd/ImageState.h" +#include "librbd/internal.h" +#include "librbd/Journal.h" +#include "librbd/ObjectMap.h" +#include "librbd/Operations.h" +#include "librbd/PluginRegistry.h" +#include "librbd/Types.h" +#include "librbd/Utils.h" +#include "librbd/api/Config.h" +#include "librbd/api/Image.h" +#include "librbd/api/Io.h" +#include "librbd/cache/Utils.h" +#include "librbd/exclusive_lock/AutomaticPolicy.h" +#include "librbd/exclusive_lock/StandardPolicy.h" +#include "librbd/deep_copy/MetadataCopyRequest.h" +#include "librbd/image/CloneRequest.h" +#include "librbd/image/CreateRequest.h" +#include "librbd/image/GetMetadataRequest.h" +#include "librbd/image/Types.h" +#include "librbd/io/AioCompletion.h" +#include "librbd/io/ImageDispatchSpec.h" +#include "librbd/io/ImageDispatcherInterface.h" +#include "librbd/io/ObjectDispatcherInterface.h" +#include "librbd/io/ObjectRequest.h" +#include "librbd/io/ReadResult.h" +#include "librbd/journal/Types.h" +#include "librbd/managed_lock/Types.h" +#include "librbd/mirror/EnableRequest.h" +#include "librbd/operation/TrimRequest.h" + +#include "journal/Journaler.h" + +#include <boost/scope_exit.hpp> +#include <boost/variant.hpp> +#include "include/ceph_assert.h" + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd: " + +#define rbd_howmany(x, y) (((x) + (y) - 1) / (y)) + +using std::map; +using std::pair; +using std::set; +using std::string; +using std::vector; +// list binds to list() here, so std::list is explicitly used below + +using ceph::bufferlist; +using librados::snap_t; +using librados::IoCtx; +using librados::Rados; + +namespace librbd { + +namespace { + +int validate_pool(IoCtx &io_ctx, CephContext *cct) { + if (!cct->_conf.get_val<bool>("rbd_validate_pool")) { + return 0; + } + + int r = io_ctx.stat(RBD_DIRECTORY, NULL, NULL); + if (r == 0) { + return 0; + } else if (r < 0 && r != -ENOENT) { + lderr(cct) << "failed to stat RBD directory: " << cpp_strerror(r) << dendl; + return r; + } + + // allocate a self-managed snapshot id if this a new pool to force + // self-managed snapshot mode + uint64_t snap_id; + r = io_ctx.selfmanaged_snap_create(&snap_id); + if (r == -EINVAL) { + lderr(cct) << "pool not configured for self-managed RBD snapshot support" + << dendl; + return r; + } else if (r < 0) { + lderr(cct) << "failed to allocate self-managed snapshot: " + << cpp_strerror(r) << dendl; + return r; + } + + r = io_ctx.selfmanaged_snap_remove(snap_id); + if (r < 0) { + lderr(cct) << "failed to release self-managed snapshot " << snap_id + << ": " << cpp_strerror(r) << dendl; + } + return 0; +} + +} // anonymous namespace + + int detect_format(IoCtx &io_ctx, const string &name, + bool *old_format, uint64_t *size) + { + CephContext *cct = (CephContext *)io_ctx.cct(); + if (old_format) + *old_format = true; + int r = io_ctx.stat(util::old_header_name(name), size, NULL); + if (r == -ENOENT) { + if (old_format) + *old_format = false; + r = io_ctx.stat(util::id_obj_name(name), size, NULL); + if (r < 0) + return r; + } else if (r < 0) { + return r; + } + + ldout(cct, 20) << "detect format of " << name << " : " + << (old_format ? (*old_format ? "old" : "new") : + "don't care") << dendl; + return 0; + } + + bool has_parent(int64_t parent_pool_id, uint64_t off, uint64_t overlap) + { + return (parent_pool_id != -1 && off <= overlap); + } + + void init_rbd_header(struct rbd_obj_header_ondisk& ondisk, + uint64_t size, int order, uint64_t bid) + { + uint32_t hi = bid >> 32; + uint32_t lo = bid & 0xFFFFFFFF; + uint32_t extra = rand() % 0xFFFFFFFF; + // FIPS zeroization audit 20191117: this memset is not security related. + memset(&ondisk, 0, sizeof(ondisk)); + + memcpy(&ondisk.text, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT)); + memcpy(&ondisk.signature, RBD_HEADER_SIGNATURE, + sizeof(RBD_HEADER_SIGNATURE)); + memcpy(&ondisk.version, RBD_HEADER_VERSION, sizeof(RBD_HEADER_VERSION)); + + snprintf(ondisk.block_name, sizeof(ondisk.block_name), "rb.%x.%x.%x", + hi, lo, extra); + + ondisk.image_size = size; + ondisk.options.order = order; + ondisk.options.crypt_type = RBD_CRYPT_NONE; + ondisk.options.comp_type = RBD_COMP_NONE; + ondisk.snap_seq = 0; + ondisk.snap_count = 0; + ondisk.reserved = 0; + ondisk.snap_names_len = 0; + } + + void image_info(ImageCtx *ictx, image_info_t& info, size_t infosize) + { + int obj_order = ictx->order; + { + std::shared_lock locker{ictx->image_lock}; + info.size = ictx->get_effective_image_size(ictx->snap_id); + } + info.obj_size = 1ULL << obj_order; + info.num_objs = Striper::get_num_objects(ictx->layout, info.size); + info.order = obj_order; + strncpy(info.block_name_prefix, ictx->object_prefix.c_str(), + RBD_MAX_BLOCK_NAME_SIZE); + info.block_name_prefix[RBD_MAX_BLOCK_NAME_SIZE - 1] = '\0'; + + // clear deprecated fields + info.parent_pool = -1L; + info.parent_name[0] = '\0'; + } + + uint64_t oid_to_object_no(const string& oid, const string& object_prefix) + { + istringstream iss(oid); + // skip object prefix and separator + iss.ignore(object_prefix.length() + 1); + uint64_t num; + iss >> std::hex >> num; + return num; + } + + void trim_image(ImageCtx *ictx, uint64_t newsize, ProgressContext& prog_ctx) + { + ceph_assert(ceph_mutex_is_locked(ictx->owner_lock)); + ceph_assert(ictx->exclusive_lock == nullptr || + ictx->exclusive_lock->is_lock_owner()); + + C_SaferCond ctx; + ictx->image_lock.lock_shared(); + operation::TrimRequest<> *req = operation::TrimRequest<>::create( + *ictx, &ctx, ictx->size, newsize, prog_ctx); + ictx->image_lock.unlock_shared(); + req->send(); + + int r = ctx.wait(); + if (r < 0) { + lderr(ictx->cct) << "warning: failed to remove some object(s): " + << cpp_strerror(r) << dendl; + } + } + + int read_header_bl(IoCtx& io_ctx, const string& header_oid, + bufferlist& header, uint64_t *ver) + { + int r; + uint64_t off = 0; +#define READ_SIZE 4096 + do { + bufferlist bl; + r = io_ctx.read(header_oid, bl, READ_SIZE, off); + if (r < 0) + return r; + header.claim_append(bl); + off += r; + } while (r == READ_SIZE); + + static_assert(sizeof(RBD_HEADER_TEXT) == sizeof(RBD_MIGRATE_HEADER_TEXT), + "length of rbd headers must be the same"); + + if (header.length() < sizeof(RBD_HEADER_TEXT) || + (memcmp(RBD_HEADER_TEXT, header.c_str(), + sizeof(RBD_HEADER_TEXT)) != 0 && + memcmp(RBD_MIGRATE_HEADER_TEXT, header.c_str(), + sizeof(RBD_MIGRATE_HEADER_TEXT)) != 0)) { + CephContext *cct = (CephContext *)io_ctx.cct(); + lderr(cct) << "unrecognized header format" << dendl; + return -ENXIO; + } + + if (ver) + *ver = io_ctx.get_last_version(); + + return 0; + } + + int read_header(IoCtx& io_ctx, const string& header_oid, + struct rbd_obj_header_ondisk *header, uint64_t *ver) + { + bufferlist header_bl; + int r = read_header_bl(io_ctx, header_oid, header_bl, ver); + if (r < 0) + return r; + if (header_bl.length() < (int)sizeof(*header)) + return -EIO; + memcpy(header, header_bl.c_str(), sizeof(*header)); + + return 0; + } + + int tmap_set(IoCtx& io_ctx, const string& imgname) + { + bufferlist cmdbl, emptybl; + __u8 c = CEPH_OSD_TMAP_SET; + encode(c, cmdbl); + encode(imgname, cmdbl); + encode(emptybl, cmdbl); + return io_ctx.tmap_update(RBD_DIRECTORY, cmdbl); + } + + int tmap_rm(IoCtx& io_ctx, const string& imgname) + { + bufferlist cmdbl; + __u8 c = CEPH_OSD_TMAP_RM; + encode(c, cmdbl); + encode(imgname, cmdbl); + return io_ctx.tmap_update(RBD_DIRECTORY, cmdbl); + } + + typedef boost::variant<std::string,uint64_t> image_option_value_t; + typedef std::map<int,image_option_value_t> image_options_t; + typedef std::shared_ptr<image_options_t> image_options_ref; + + enum image_option_type_t { + STR, + UINT64, + }; + + const std::map<int, image_option_type_t> IMAGE_OPTIONS_TYPE_MAPPING = { + {RBD_IMAGE_OPTION_FORMAT, UINT64}, + {RBD_IMAGE_OPTION_FEATURES, UINT64}, + {RBD_IMAGE_OPTION_ORDER, UINT64}, + {RBD_IMAGE_OPTION_STRIPE_UNIT, UINT64}, + {RBD_IMAGE_OPTION_STRIPE_COUNT, UINT64}, + {RBD_IMAGE_OPTION_JOURNAL_ORDER, UINT64}, + {RBD_IMAGE_OPTION_JOURNAL_SPLAY_WIDTH, UINT64}, + {RBD_IMAGE_OPTION_JOURNAL_POOL, STR}, + {RBD_IMAGE_OPTION_FEATURES_SET, UINT64}, + {RBD_IMAGE_OPTION_FEATURES_CLEAR, UINT64}, + {RBD_IMAGE_OPTION_DATA_POOL, STR}, + {RBD_IMAGE_OPTION_FLATTEN, UINT64}, + {RBD_IMAGE_OPTION_CLONE_FORMAT, UINT64}, + {RBD_IMAGE_OPTION_MIRROR_IMAGE_MODE, UINT64}, + }; + + std::string image_option_name(int optname) { + switch (optname) { + case RBD_IMAGE_OPTION_FORMAT: + return "format"; + case RBD_IMAGE_OPTION_FEATURES: + return "features"; + case RBD_IMAGE_OPTION_ORDER: + return "order"; + case RBD_IMAGE_OPTION_STRIPE_UNIT: + return "stripe_unit"; + case RBD_IMAGE_OPTION_STRIPE_COUNT: + return "stripe_count"; + case RBD_IMAGE_OPTION_JOURNAL_ORDER: + return "journal_order"; + case RBD_IMAGE_OPTION_JOURNAL_SPLAY_WIDTH: + return "journal_splay_width"; + case RBD_IMAGE_OPTION_JOURNAL_POOL: + return "journal_pool"; + case RBD_IMAGE_OPTION_FEATURES_SET: + return "features_set"; + case RBD_IMAGE_OPTION_FEATURES_CLEAR: + return "features_clear"; + case RBD_IMAGE_OPTION_DATA_POOL: + return "data_pool"; + case RBD_IMAGE_OPTION_FLATTEN: + return "flatten"; + case RBD_IMAGE_OPTION_CLONE_FORMAT: + return "clone_format"; + case RBD_IMAGE_OPTION_MIRROR_IMAGE_MODE: + return "mirror_image_mode"; + default: + return "unknown (" + stringify(optname) + ")"; + } + } + + void image_options_create(rbd_image_options_t* opts) + { + image_options_ref* opts_ = new image_options_ref(new image_options_t()); + + *opts = static_cast<rbd_image_options_t>(opts_); + } + + void image_options_create_ref(rbd_image_options_t* opts, + rbd_image_options_t orig) + { + image_options_ref* orig_ = static_cast<image_options_ref*>(orig); + image_options_ref* opts_ = new image_options_ref(*orig_); + + *opts = static_cast<rbd_image_options_t>(opts_); + } + + void image_options_copy(rbd_image_options_t* opts, + const ImageOptions &orig) + { + image_options_ref* opts_ = new image_options_ref(new image_options_t()); + + *opts = static_cast<rbd_image_options_t>(opts_); + + std::string str_val; + uint64_t uint64_val; + for (auto &i : IMAGE_OPTIONS_TYPE_MAPPING) { + switch (i.second) { + case STR: + if (orig.get(i.first, &str_val) == 0) { + image_options_set(*opts, i.first, str_val); + } + continue; + case UINT64: + if (orig.get(i.first, &uint64_val) == 0) { + image_options_set(*opts, i.first, uint64_val); + } + continue; + } + } + } + + void image_options_destroy(rbd_image_options_t opts) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + delete opts_; + } + + int image_options_set(rbd_image_options_t opts, int optname, + const std::string& optval) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + std::map<int, image_option_type_t>::const_iterator i = + IMAGE_OPTIONS_TYPE_MAPPING.find(optname); + + if (i == IMAGE_OPTIONS_TYPE_MAPPING.end() || i->second != STR) { + return -EINVAL; + } + + (*opts_->get())[optname] = optval; + return 0; + } + + int image_options_set(rbd_image_options_t opts, int optname, uint64_t optval) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + std::map<int, image_option_type_t>::const_iterator i = + IMAGE_OPTIONS_TYPE_MAPPING.find(optname); + + if (i == IMAGE_OPTIONS_TYPE_MAPPING.end() || i->second != UINT64) { + return -EINVAL; + } + + (*opts_->get())[optname] = optval; + return 0; + } + + int image_options_get(rbd_image_options_t opts, int optname, + std::string* optval) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + std::map<int, image_option_type_t>::const_iterator i = + IMAGE_OPTIONS_TYPE_MAPPING.find(optname); + + if (i == IMAGE_OPTIONS_TYPE_MAPPING.end() || i->second != STR) { + return -EINVAL; + } + + image_options_t::const_iterator j = (*opts_)->find(optname); + + if (j == (*opts_)->end()) { + return -ENOENT; + } + + *optval = boost::get<std::string>(j->second); + return 0; + } + + int image_options_get(rbd_image_options_t opts, int optname, uint64_t* optval) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + std::map<int, image_option_type_t>::const_iterator i = + IMAGE_OPTIONS_TYPE_MAPPING.find(optname); + + if (i == IMAGE_OPTIONS_TYPE_MAPPING.end() || i->second != UINT64) { + return -EINVAL; + } + + image_options_t::const_iterator j = (*opts_)->find(optname); + + if (j == (*opts_)->end()) { + return -ENOENT; + } + + *optval = boost::get<uint64_t>(j->second); + return 0; + } + + int image_options_is_set(rbd_image_options_t opts, int optname, + bool* is_set) + { + if (IMAGE_OPTIONS_TYPE_MAPPING.find(optname) == + IMAGE_OPTIONS_TYPE_MAPPING.end()) { + return -EINVAL; + } + + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + *is_set = ((*opts_)->find(optname) != (*opts_)->end()); + return 0; + } + + int image_options_unset(rbd_image_options_t opts, int optname) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + std::map<int, image_option_type_t>::const_iterator i = + IMAGE_OPTIONS_TYPE_MAPPING.find(optname); + + if (i == IMAGE_OPTIONS_TYPE_MAPPING.end()) { + ceph_assert((*opts_)->find(optname) == (*opts_)->end()); + return -EINVAL; + } + + image_options_t::const_iterator j = (*opts_)->find(optname); + + if (j == (*opts_)->end()) { + return -ENOENT; + } + + (*opts_)->erase(j); + return 0; + } + + void image_options_clear(rbd_image_options_t opts) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + (*opts_)->clear(); + } + + bool image_options_is_empty(rbd_image_options_t opts) + { + image_options_ref* opts_ = static_cast<image_options_ref*>(opts); + + return (*opts_)->empty(); + } + + int create_v1(IoCtx& io_ctx, const char *imgname, uint64_t size, int order) + { + CephContext *cct = (CephContext *)io_ctx.cct(); + + ldout(cct, 20) << __func__ << " " << &io_ctx << " name = " << imgname + << " size = " << size << " order = " << order << dendl; + int r = validate_pool(io_ctx, cct); + if (r < 0) { + return r; + } + + if (!io_ctx.get_namespace().empty()) { + lderr(cct) << "attempting to add v1 image to namespace" << dendl; + return -EINVAL; + } + + ldout(cct, 2) << "adding rbd image to directory..." << dendl; + r = tmap_set(io_ctx, imgname); + if (r < 0) { + lderr(cct) << "error adding image to directory: " << cpp_strerror(r) + << dendl; + return r; + } + + Rados rados(io_ctx); + uint64_t bid = rados.get_instance_id(); + + ldout(cct, 2) << "creating rbd image..." << dendl; + struct rbd_obj_header_ondisk header; + init_rbd_header(header, size, order, bid); + + bufferlist bl; + bl.append((const char *)&header, sizeof(header)); + + string header_oid = util::old_header_name(imgname); + r = io_ctx.write(header_oid, bl, bl.length(), 0); + if (r < 0) { + lderr(cct) << "Error writing image header: " << cpp_strerror(r) + << dendl; + int remove_r = tmap_rm(io_ctx, imgname); + if (remove_r < 0) { + lderr(cct) << "Could not remove image from directory after " + << "header creation failed: " + << cpp_strerror(remove_r) << dendl; + } + return r; + } + + ldout(cct, 2) << "done." << dendl; + return 0; + } + + int create(librados::IoCtx& io_ctx, const char *imgname, uint64_t size, + int *order) + { + uint64_t order_ = *order; + ImageOptions opts; + + int r = opts.set(RBD_IMAGE_OPTION_ORDER, order_); + ceph_assert(r == 0); + + r = create(io_ctx, imgname, "", size, opts, "", "", false); + + int r1 = opts.get(RBD_IMAGE_OPTION_ORDER, &order_); + ceph_assert(r1 == 0); + *order = order_; + + return r; + } + + int create(IoCtx& io_ctx, const char *imgname, uint64_t size, + bool old_format, uint64_t features, int *order, + uint64_t stripe_unit, uint64_t stripe_count) + { + if (!order) + return -EINVAL; + + uint64_t order_ = *order; + uint64_t format = old_format ? 1 : 2; + ImageOptions opts; + int r; + + r = opts.set(RBD_IMAGE_OPTION_FORMAT, format); + ceph_assert(r == 0); + r = opts.set(RBD_IMAGE_OPTION_FEATURES, features); + ceph_assert(r == 0); + r = opts.set(RBD_IMAGE_OPTION_ORDER, order_); + ceph_assert(r == 0); + r = opts.set(RBD_IMAGE_OPTION_STRIPE_UNIT, stripe_unit); + ceph_assert(r == 0); + r = opts.set(RBD_IMAGE_OPTION_STRIPE_COUNT, stripe_count); + ceph_assert(r == 0); + + r = create(io_ctx, imgname, "", size, opts, "", "", false); + + int r1 = opts.get(RBD_IMAGE_OPTION_ORDER, &order_); + ceph_assert(r1 == 0); + *order = order_; + + return r; + } + + int create(IoCtx& io_ctx, const std::string &image_name, + const std::string &image_id, uint64_t size, + ImageOptions& opts, + const std::string &non_primary_global_image_id, + const std::string &primary_mirror_uuid, + bool skip_mirror_enable) + { + std::string id(image_id); + if (id.empty()) { + id = util::generate_image_id(io_ctx); + } + + CephContext *cct = (CephContext *)io_ctx.cct(); + uint64_t option; + if (opts.get(RBD_IMAGE_OPTION_FLATTEN, &option) == 0) { + lderr(cct) << "create does not support 'flatten' image option" << dendl; + return -EINVAL; + } + if (opts.get(RBD_IMAGE_OPTION_CLONE_FORMAT, &option) == 0) { + lderr(cct) << "create does not support 'clone_format' image option" + << dendl; + return -EINVAL; + } + + ldout(cct, 10) << __func__ << " name=" << image_name << ", " + << "id= " << id << ", " + << "size=" << size << ", opts=" << opts << dendl; + + uint64_t format; + if (opts.get(RBD_IMAGE_OPTION_FORMAT, &format) != 0) + format = cct->_conf.get_val<uint64_t>("rbd_default_format"); + bool old_format = format == 1; + + // make sure it doesn't already exist, in either format + int r = detect_format(io_ctx, image_name, NULL, NULL); + if (r != -ENOENT) { + if (r) { + lderr(cct) << "Could not tell if " << image_name << " already exists" + << dendl; + return r; + } + lderr(cct) << "rbd image " << image_name << " already exists" << dendl; + return -EEXIST; + } + + uint64_t order = 0; + if (opts.get(RBD_IMAGE_OPTION_ORDER, &order) != 0 || order == 0) { + order = cct->_conf.get_val<uint64_t>("rbd_default_order"); + } + r = image::CreateRequest<>::validate_order(cct, order); + if (r < 0) { + return r; + } + + if (old_format) { + if ( !getenv("RBD_FORCE_ALLOW_V1") ) { + lderr(cct) << "Format 1 image creation unsupported. " << dendl; + return -EINVAL; + } + lderr(cct) << "Forced V1 image creation. " << dendl; + r = create_v1(io_ctx, image_name.c_str(), size, order); + } else { + AsioEngine asio_engine(io_ctx); + + ConfigProxy config{cct->_conf}; + api::Config<>::apply_pool_overrides(io_ctx, &config); + + uint32_t create_flags = 0U; + uint64_t mirror_image_mode = RBD_MIRROR_IMAGE_MODE_JOURNAL; + if (skip_mirror_enable) { + create_flags = image::CREATE_FLAG_SKIP_MIRROR_ENABLE; + } else if (opts.get(RBD_IMAGE_OPTION_MIRROR_IMAGE_MODE, + &mirror_image_mode) == 0) { + create_flags = image::CREATE_FLAG_FORCE_MIRROR_ENABLE; + } + + C_SaferCond cond; + image::CreateRequest<> *req = image::CreateRequest<>::create( + config, io_ctx, image_name, id, size, opts, create_flags, + static_cast<cls::rbd::MirrorImageMode>(mirror_image_mode), + non_primary_global_image_id, primary_mirror_uuid, + asio_engine.get_work_queue(), &cond); + req->send(); + + r = cond.wait(); + } + + int r1 = opts.set(RBD_IMAGE_OPTION_ORDER, order); + ceph_assert(r1 == 0); + + return r; + } + + /* + * Parent may be in different pool, hence different IoCtx + */ + int clone(IoCtx& p_ioctx, const char *p_name, const char *p_snap_name, + IoCtx& c_ioctx, const char *c_name, + uint64_t features, int *c_order, + uint64_t stripe_unit, int stripe_count) + { + uint64_t order = *c_order; + + ImageOptions opts; + opts.set(RBD_IMAGE_OPTION_FEATURES, features); + opts.set(RBD_IMAGE_OPTION_ORDER, order); + opts.set(RBD_IMAGE_OPTION_STRIPE_UNIT, stripe_unit); + opts.set(RBD_IMAGE_OPTION_STRIPE_COUNT, stripe_count); + + int r = clone(p_ioctx, nullptr, p_name, p_snap_name, c_ioctx, nullptr, + c_name, opts, "", ""); + opts.get(RBD_IMAGE_OPTION_ORDER, &order); + *c_order = order; + return r; + } + + int clone(IoCtx& p_ioctx, const char *p_id, const char *p_name, + const char *p_snap_name, IoCtx& c_ioctx, const char *c_id, + const char *c_name, ImageOptions& c_opts, + const std::string &non_primary_global_image_id, + const std::string &primary_mirror_uuid) + { + ceph_assert((p_id == nullptr) ^ (p_name == nullptr)); + + CephContext *cct = (CephContext *)p_ioctx.cct(); + if (p_snap_name == nullptr) { + lderr(cct) << "image to be cloned must be a snapshot" << dendl; + return -EINVAL; + } + + uint64_t flatten; + if (c_opts.get(RBD_IMAGE_OPTION_FLATTEN, &flatten) == 0) { + lderr(cct) << "clone does not support 'flatten' image option" << dendl; + return -EINVAL; + } + + int r; + std::string parent_id; + if (p_id == nullptr) { + r = cls_client::dir_get_id(&p_ioctx, RBD_DIRECTORY, p_name, + &parent_id); + if (r < 0) { + if (r != -ENOENT) { + lderr(cct) << "failed to retrieve parent image id: " + << cpp_strerror(r) << dendl; + } + return r; + } + } else { + parent_id = p_id; + } + + std::string clone_id; + if (c_id == nullptr) { + clone_id = util::generate_image_id(c_ioctx); + } else { + clone_id = c_id; + } + + ldout(cct, 10) << __func__ << " " + << "c_name=" << c_name << ", " + << "c_id= " << clone_id << ", " + << "c_opts=" << c_opts << dendl; + + ConfigProxy config{reinterpret_cast<CephContext *>(c_ioctx.cct())->_conf}; + api::Config<>::apply_pool_overrides(c_ioctx, &config); + + AsioEngine asio_engine(p_ioctx); + + C_SaferCond cond; + auto *req = image::CloneRequest<>::create( + config, p_ioctx, parent_id, p_snap_name, + {cls::rbd::UserSnapshotNamespace{}}, CEPH_NOSNAP, c_ioctx, c_name, + clone_id, c_opts, cls::rbd::MIRROR_IMAGE_MODE_JOURNAL, + non_primary_global_image_id, primary_mirror_uuid, + asio_engine.get_work_queue(), &cond); + req->send(); + + r = cond.wait(); + if (r < 0) { + return r; + } + + return 0; + } + + int rename(IoCtx& io_ctx, const char *srcname, const char *dstname) + { + CephContext *cct = (CephContext *)io_ctx.cct(); + ldout(cct, 20) << "rename " << &io_ctx << " " << srcname << " -> " + << dstname << dendl; + + ImageCtx *ictx = new ImageCtx(srcname, "", "", io_ctx, false); + int r = ictx->state->open(0); + if (r < 0) { + lderr(cct) << "error opening source image: " << cpp_strerror(r) << dendl; + return r; + } + BOOST_SCOPE_EXIT((ictx)) { + ictx->state->close(); + } BOOST_SCOPE_EXIT_END + + return ictx->operations->rename(dstname); + } + + int info(ImageCtx *ictx, image_info_t& info, size_t infosize) + { + ldout(ictx->cct, 20) << "info " << ictx << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + image_info(ictx, info, infosize); + return 0; + } + + int get_old_format(ImageCtx *ictx, uint8_t *old) + { + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + *old = ictx->old_format; + return 0; + } + + int get_size(ImageCtx *ictx, uint64_t *size) + { + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + std::shared_lock l2{ictx->image_lock}; + *size = ictx->get_effective_image_size(ictx->snap_id); + return 0; + } + + int get_features(ImageCtx *ictx, uint64_t *features) + { + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + std::shared_lock l{ictx->image_lock}; + *features = ictx->features; + return 0; + } + + int get_overlap(ImageCtx *ictx, uint64_t *overlap) + { + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + std::shared_lock image_locker{ictx->image_lock}; + return ictx->get_parent_overlap(ictx->snap_id, overlap); + } + + int get_flags(ImageCtx *ictx, uint64_t *flags) + { + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + std::shared_lock l2{ictx->image_lock}; + return ictx->get_flags(ictx->snap_id, flags); + } + + int set_image_notification(ImageCtx *ictx, int fd, int type) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << " " << ictx << " fd " << fd << " type" << type << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + if (ictx->event_socket.is_valid()) + return -EINVAL; + return ictx->event_socket.init(fd, type); + } + + int is_exclusive_lock_owner(ImageCtx *ictx, bool *is_owner) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << ": ictx=" << ictx << dendl; + *is_owner = false; + + std::shared_lock owner_locker{ictx->owner_lock}; + if (ictx->exclusive_lock == nullptr) { + return 0; + } + + // might have been blocklisted by peer -- ensure we still own + // the lock by pinging the OSD + int r = ictx->exclusive_lock->assert_header_locked(); + if (r == -EBUSY || r == -ENOENT) { + return 0; + } else if (r < 0) { + return r; + } + + *is_owner = true; + return 0; + } + + int lock_acquire(ImageCtx *ictx, rbd_lock_mode_t lock_mode) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << ": ictx=" << ictx << ", " + << "lock_mode=" << lock_mode << dendl; + + if (lock_mode != RBD_LOCK_MODE_EXCLUSIVE) { + return -EOPNOTSUPP; + } + + C_SaferCond lock_ctx; + { + std::unique_lock l{ictx->owner_lock}; + + if (ictx->exclusive_lock == nullptr) { + lderr(cct) << "exclusive-lock feature is not enabled" << dendl; + return -EINVAL; + } + + if (ictx->get_exclusive_lock_policy()->may_auto_request_lock()) { + ictx->set_exclusive_lock_policy( + new exclusive_lock::StandardPolicy(ictx)); + } + + if (ictx->exclusive_lock->is_lock_owner()) { + return 0; + } + + ictx->exclusive_lock->acquire_lock(&lock_ctx); + } + + int r = lock_ctx.wait(); + if (r < 0) { + lderr(cct) << "failed to request exclusive lock: " << cpp_strerror(r) + << dendl; + return r; + } + + std::shared_lock l{ictx->owner_lock}; + if (ictx->exclusive_lock == nullptr) { + return -EINVAL; + } else if (!ictx->exclusive_lock->is_lock_owner()) { + lderr(cct) << "failed to acquire exclusive lock" << dendl; + return ictx->exclusive_lock->get_unlocked_op_error(); + } + + return 0; + } + + int lock_release(ImageCtx *ictx) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << ": ictx=" << ictx << dendl; + + C_SaferCond lock_ctx; + { + std::unique_lock l{ictx->owner_lock}; + + if (ictx->exclusive_lock == nullptr || + !ictx->exclusive_lock->is_lock_owner()) { + lderr(cct) << "not exclusive lock owner" << dendl; + return -EINVAL; + } + + ictx->exclusive_lock->release_lock(&lock_ctx); + } + + int r = lock_ctx.wait(); + if (r < 0) { + lderr(cct) << "failed to release exclusive lock: " << cpp_strerror(r) + << dendl; + return r; + } + return 0; + } + + int lock_get_owners(ImageCtx *ictx, rbd_lock_mode_t *lock_mode, + std::list<std::string> *lock_owners) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << ": ictx=" << ictx << dendl; + + managed_lock::Locker locker; + C_SaferCond get_owner_ctx; + { + std::shared_lock owner_locker{ictx->owner_lock}; + + if (ictx->exclusive_lock == nullptr) { + lderr(cct) << "exclusive-lock feature is not enabled" << dendl; + return -EINVAL; + } + + ictx->exclusive_lock->get_locker(&locker, &get_owner_ctx); + } + + int r = get_owner_ctx.wait(); + if (r == -ENOENT) { + return r; + } else if (r < 0) { + lderr(cct) << "failed to determine current lock owner: " + << cpp_strerror(r) << dendl; + return r; + } + + *lock_mode = RBD_LOCK_MODE_EXCLUSIVE; + lock_owners->clear(); + lock_owners->emplace_back(locker.address); + return 0; + } + + int lock_break(ImageCtx *ictx, rbd_lock_mode_t lock_mode, + const std::string &lock_owner) { + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << ": ictx=" << ictx << ", " + << "lock_mode=" << lock_mode << ", " + << "lock_owner=" << lock_owner << dendl; + + if (lock_mode != RBD_LOCK_MODE_EXCLUSIVE) { + return -EOPNOTSUPP; + } + + if (ictx->read_only) { + return -EROFS; + } + + managed_lock::Locker locker; + C_SaferCond get_owner_ctx; + { + std::shared_lock l{ictx->owner_lock}; + + if (ictx->exclusive_lock == nullptr) { + lderr(cct) << "exclusive-lock feature is not enabled" << dendl; + return -EINVAL; + } + + ictx->exclusive_lock->get_locker(&locker, &get_owner_ctx); + } + int r = get_owner_ctx.wait(); + if (r == -ENOENT) { + return r; + } else if (r < 0) { + lderr(cct) << "failed to determine current lock owner: " + << cpp_strerror(r) << dendl; + return r; + } + + if (locker.address != lock_owner) { + return -EBUSY; + } + + C_SaferCond break_ctx; + { + std::shared_lock l{ictx->owner_lock}; + + if (ictx->exclusive_lock == nullptr) { + lderr(cct) << "exclusive-lock feature is not enabled" << dendl; + return -EINVAL; + } + + ictx->exclusive_lock->break_lock(locker, true, &break_ctx); + } + r = break_ctx.wait(); + if (r == -ENOENT) { + return r; + } else if (r < 0) { + lderr(cct) << "failed to break lock: " << cpp_strerror(r) << dendl; + return r; + } + return 0; + } + + int copy(ImageCtx *src, IoCtx& dest_md_ctx, const char *destname, + ImageOptions& opts, ProgressContext &prog_ctx, size_t sparse_size) + { + CephContext *cct = (CephContext *)dest_md_ctx.cct(); + uint64_t option; + if (opts.get(RBD_IMAGE_OPTION_FLATTEN, &option) == 0) { + lderr(cct) << "copy does not support 'flatten' image option" << dendl; + return -EINVAL; + } + if (opts.get(RBD_IMAGE_OPTION_CLONE_FORMAT, &option) == 0) { + lderr(cct) << "copy does not support 'clone_format' image option" + << dendl; + return -EINVAL; + } + + ldout(cct, 20) << "copy " << src->name + << (src->snap_name.length() ? "@" + src->snap_name : "") + << " -> " << destname << " opts = " << opts << dendl; + + src->image_lock.lock_shared(); + uint64_t features = src->features; + uint64_t src_size = src->get_image_size(src->snap_id); + src->image_lock.unlock_shared(); + uint64_t format = 2; + if (opts.get(RBD_IMAGE_OPTION_FORMAT, &format) != 0) { + opts.set(RBD_IMAGE_OPTION_FORMAT, format); + } + uint64_t stripe_unit = src->stripe_unit; + if (opts.get(RBD_IMAGE_OPTION_STRIPE_UNIT, &stripe_unit) != 0) { + opts.set(RBD_IMAGE_OPTION_STRIPE_UNIT, stripe_unit); + } + uint64_t stripe_count = src->stripe_count; + if (opts.get(RBD_IMAGE_OPTION_STRIPE_COUNT, &stripe_count) != 0) { + opts.set(RBD_IMAGE_OPTION_STRIPE_COUNT, stripe_count); + } + uint64_t order = src->order; + if (opts.get(RBD_IMAGE_OPTION_ORDER, &order) != 0) { + opts.set(RBD_IMAGE_OPTION_ORDER, order); + } + if (opts.get(RBD_IMAGE_OPTION_FEATURES, &features) != 0) { + opts.set(RBD_IMAGE_OPTION_FEATURES, features); + } + if (features & ~RBD_FEATURES_ALL) { + lderr(cct) << "librbd does not support requested features" << dendl; + return -ENOSYS; + } + + int r = create(dest_md_ctx, destname, "", src_size, opts, "", "", false); + if (r < 0) { + lderr(cct) << "header creation failed" << dendl; + return r; + } + opts.set(RBD_IMAGE_OPTION_ORDER, static_cast<uint64_t>(order)); + + ImageCtx *dest = new librbd::ImageCtx(destname, "", nullptr, dest_md_ctx, + false); + r = dest->state->open(0); + if (r < 0) { + lderr(cct) << "failed to read newly created header" << dendl; + return r; + } + + r = copy(src, dest, prog_ctx, sparse_size); + + int close_r = dest->state->close(); + if (r == 0 && close_r < 0) { + r = close_r; + } + return r; + } + + class C_CopyWrite : public Context { + public: + C_CopyWrite(bufferlist *bl, Context* ctx) + : m_bl(bl), m_ctx(ctx) {} + void finish(int r) override { + delete m_bl; + m_ctx->complete(r); + } + private: + bufferlist *m_bl; + Context *m_ctx; + }; + + class C_CopyRead : public Context { + public: + C_CopyRead(SimpleThrottle *throttle, ImageCtx *dest, uint64_t offset, + bufferlist *bl, size_t sparse_size) + : m_throttle(throttle), m_dest(dest), m_offset(offset), m_bl(bl), + m_sparse_size(sparse_size) { + m_throttle->start_op(); + } + void finish(int r) override { + if (r < 0) { + lderr(m_dest->cct) << "error reading from source image at offset " + << m_offset << ": " << cpp_strerror(r) << dendl; + delete m_bl; + m_throttle->end_op(r); + return; + } + ceph_assert(m_bl->length() == (size_t)r); + + if (m_bl->is_zero()) { + delete m_bl; + m_throttle->end_op(r); + return; + } + + if (!m_sparse_size) { + m_sparse_size = (1 << m_dest->order); + } + + auto *throttle = m_throttle; + auto *end_op_ctx = new LambdaContext([throttle](int r) { + throttle->end_op(r); + }); + auto gather_ctx = new C_Gather(m_dest->cct, end_op_ctx); + + m_bl->rebuild(buffer::ptr_node::create(m_bl->length())); + size_t write_offset = 0; + size_t write_length = 0; + size_t offset = 0; + size_t length = m_bl->length(); + const auto& m_ptr = m_bl->front(); + while (offset < length) { + if (util::calc_sparse_extent(m_ptr, + m_sparse_size, + length, + &write_offset, + &write_length, + &offset)) { + bufferlist *write_bl = new bufferlist(); + write_bl->push_back( + buffer::ptr_node::create(m_ptr, write_offset, write_length)); + Context *ctx = new C_CopyWrite(write_bl, gather_ctx->new_sub()); + auto comp = io::AioCompletion::create(ctx); + + // coordinate through AIO WQ to ensure lock is acquired if needed + api::Io<>::aio_write(*m_dest, comp, m_offset + write_offset, + write_length, std::move(*write_bl), + LIBRADOS_OP_FLAG_FADVISE_DONTNEED, + std::move(read_trace)); + write_offset = offset; + write_length = 0; + } + } + delete m_bl; + ceph_assert(gather_ctx->get_sub_created_count() > 0); + gather_ctx->activate(); + } + + ZTracer::Trace read_trace; + + private: + SimpleThrottle *m_throttle; + ImageCtx *m_dest; + uint64_t m_offset; + bufferlist *m_bl; + size_t m_sparse_size; + }; + + int copy(ImageCtx *src, ImageCtx *dest, ProgressContext &prog_ctx, size_t sparse_size) + { + src->image_lock.lock_shared(); + uint64_t src_size = src->get_image_size(src->snap_id); + src->image_lock.unlock_shared(); + + dest->image_lock.lock_shared(); + uint64_t dest_size = dest->get_image_size(dest->snap_id); + dest->image_lock.unlock_shared(); + + CephContext *cct = src->cct; + if (dest_size < src_size) { + lderr(cct) << " src size " << src_size << " > dest size " + << dest_size << dendl; + return -EINVAL; + } + + // ensure previous writes are visible to dest + C_SaferCond flush_ctx; + { + auto aio_comp = io::AioCompletion::create_and_start(&flush_ctx, src, + io::AIO_TYPE_FLUSH); + auto req = io::ImageDispatchSpec::create_flush( + *src, io::IMAGE_DISPATCH_LAYER_INTERNAL_START, + aio_comp, io::FLUSH_SOURCE_INTERNAL, {}); + req->send(); + } + int r = flush_ctx.wait(); + if (r < 0) { + return r; + } + + C_SaferCond ctx; + auto req = deep_copy::MetadataCopyRequest<>::create( + src, dest, &ctx); + req->send(); + + r = ctx.wait(); + if (r < 0) { + lderr(cct) << "failed to copy metadata: " << cpp_strerror(r) << dendl; + return r; + } + + ZTracer::Trace trace; + if (src->blkin_trace_all) { + trace.init("copy", &src->trace_endpoint); + } + + SimpleThrottle throttle(src->config.get_val<uint64_t>("rbd_concurrent_management_ops"), false); + uint64_t period = src->get_stripe_period(); + unsigned fadvise_flags = LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL | + LIBRADOS_OP_FLAG_FADVISE_NOCACHE; + uint64_t object_id = 0; + for (uint64_t offset = 0; offset < src_size; offset += period) { + if (throttle.pending_error()) { + return throttle.wait_for_ret(); + } + + { + std::shared_lock image_locker{src->image_lock}; + if (src->object_map != nullptr) { + bool skip = true; + // each period is related to src->stripe_count objects, check them all + for (uint64_t i=0; i < src->stripe_count; i++) { + if (object_id < src->object_map->size() && + src->object_map->object_may_exist(object_id)) { + skip = false; + } + ++object_id; + } + + if (skip) continue; + } else { + object_id += src->stripe_count; + } + } + + uint64_t len = min(period, src_size - offset); + bufferlist *bl = new bufferlist(); + auto ctx = new C_CopyRead(&throttle, dest, offset, bl, sparse_size); + auto comp = io::AioCompletion::create_and_start<Context>( + ctx, src, io::AIO_TYPE_READ); + auto req = io::ImageDispatchSpec::create_read( + *src, io::IMAGE_DISPATCH_LAYER_NONE, comp, + {{offset, len}}, io::ReadResult{bl}, + src->get_data_io_context(), fadvise_flags, 0, trace); + + ctx->read_trace = trace; + req->send(); + + prog_ctx.update_progress(offset, src_size); + } + + r = throttle.wait_for_ret(); + if (r >= 0) + prog_ctx.update_progress(src_size, src_size); + return r; + } + + int list_lockers(ImageCtx *ictx, + std::list<locker_t> *lockers, + bool *exclusive, + string *tag) + { + ldout(ictx->cct, 20) << "list_locks on image " << ictx << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + std::shared_lock locker{ictx->image_lock}; + if (exclusive) + *exclusive = ictx->exclusive_locked; + if (tag) + *tag = ictx->lock_tag; + if (lockers) { + lockers->clear(); + map<rados::cls::lock::locker_id_t, + rados::cls::lock::locker_info_t>::const_iterator it; + for (it = ictx->lockers.begin(); it != ictx->lockers.end(); ++it) { + locker_t locker; + locker.client = stringify(it->first.locker); + locker.cookie = it->first.cookie; + locker.address = it->second.addr.get_legacy_str(); + lockers->push_back(locker); + } + } + + return 0; + } + + int lock(ImageCtx *ictx, bool exclusive, const string& cookie, + const string& tag) + { + ldout(ictx->cct, 20) << "lock image " << ictx << " exclusive=" << exclusive + << " cookie='" << cookie << "' tag='" << tag << "'" + << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + /** + * If we wanted we could do something more intelligent, like local + * checks that we think we will succeed. But for now, let's not + * duplicate that code. + */ + { + std::shared_lock locker{ictx->image_lock}; + r = rados::cls::lock::lock(&ictx->md_ctx, ictx->header_oid, RBD_LOCK_NAME, + exclusive ? ClsLockType::EXCLUSIVE : ClsLockType::SHARED, + cookie, tag, "", utime_t(), 0); + if (r < 0) { + return r; + } + } + + ictx->notify_update(); + return 0; + } + + int unlock(ImageCtx *ictx, const string& cookie) + { + ldout(ictx->cct, 20) << "unlock image " << ictx + << " cookie='" << cookie << "'" << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + { + std::shared_lock locker{ictx->image_lock}; + r = rados::cls::lock::unlock(&ictx->md_ctx, ictx->header_oid, + RBD_LOCK_NAME, cookie); + if (r < 0) { + return r; + } + } + + ictx->notify_update(); + return 0; + } + + int break_lock(ImageCtx *ictx, const string& client, + const string& cookie) + { + ldout(ictx->cct, 20) << "break_lock image " << ictx << " client='" << client + << "' cookie='" << cookie << "'" << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + entity_name_t lock_client; + if (!lock_client.parse(client)) { + lderr(ictx->cct) << "Unable to parse client '" << client + << "'" << dendl; + return -EINVAL; + } + + if (ictx->config.get_val<bool>("rbd_blocklist_on_break_lock")) { + typedef std::map<rados::cls::lock::locker_id_t, + rados::cls::lock::locker_info_t> Lockers; + Lockers lockers; + ClsLockType lock_type; + std::string lock_tag; + r = rados::cls::lock::get_lock_info(&ictx->md_ctx, ictx->header_oid, + RBD_LOCK_NAME, &lockers, &lock_type, + &lock_tag); + if (r < 0) { + lderr(ictx->cct) << "unable to retrieve lock info: " << cpp_strerror(r) + << dendl; + return r; + } + + std::string client_address; + for (Lockers::iterator it = lockers.begin(); + it != lockers.end(); ++it) { + if (it->first.locker == lock_client) { + client_address = it->second.addr.get_legacy_str(); + break; + } + } + if (client_address.empty()) { + return -ENOENT; + } + + librados::Rados rados(ictx->md_ctx); + r = rados.blocklist_add( + client_address, + ictx->config.get_val<uint64_t>("rbd_blocklist_expire_seconds")); + if (r < 0) { + lderr(ictx->cct) << "unable to blocklist client: " << cpp_strerror(r) + << dendl; + return r; + } + } + + r = rados::cls::lock::break_lock(&ictx->md_ctx, ictx->header_oid, + RBD_LOCK_NAME, cookie, lock_client); + if (r < 0) + return r; + ictx->notify_update(); + return 0; + } + + void rbd_ctx_cb(completion_t cb, void *arg) + { + Context *ctx = reinterpret_cast<Context *>(arg); + auto comp = reinterpret_cast<io::AioCompletion *>(cb); + ctx->complete(comp->get_return_value()); + comp->release(); + } + + int64_t read_iterate(ImageCtx *ictx, uint64_t off, uint64_t len, + int (*cb)(uint64_t, size_t, const char *, void *), + void *arg) + { + coarse_mono_time start_time; + ceph::timespan elapsed; + + ldout(ictx->cct, 20) << "read_iterate " << ictx << " off = " << off + << " len = " << len << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) + return r; + + uint64_t mylen = len; + ictx->image_lock.lock_shared(); + r = clip_io(ictx, off, &mylen); + ictx->image_lock.unlock_shared(); + if (r < 0) + return r; + + int64_t total_read = 0; + uint64_t period = ictx->get_stripe_period(); + uint64_t left = mylen; + + ZTracer::Trace trace; + if (ictx->blkin_trace_all) { + trace.init("read_iterate", &ictx->trace_endpoint); + } + + std::shared_lock owner_locker{ictx->owner_lock}; + start_time = coarse_mono_clock::now(); + while (left > 0) { + uint64_t period_off = off - (off % period); + uint64_t read_len = min(period_off + period - off, left); + + bufferlist bl; + + C_SaferCond ctx; + auto c = io::AioCompletion::create_and_start(&ctx, ictx, + io::AIO_TYPE_READ); + auto req = io::ImageDispatchSpec::create_read( + *ictx, io::IMAGE_DISPATCH_LAYER_NONE, c, + {{off, read_len}}, io::ReadResult{&bl}, + ictx->get_data_io_context(), 0, 0, trace); + req->send(); + + int ret = ctx.wait(); + if (ret < 0) { + return ret; + } + + r = cb(total_read, ret, bl.c_str(), arg); + if (r < 0) { + return r; + } + + total_read += ret; + left -= ret; + off += ret; + } + + elapsed = coarse_mono_clock::now() - start_time; + ictx->perfcounter->tinc(l_librbd_rd_latency, elapsed); + ictx->perfcounter->inc(l_librbd_rd); + ictx->perfcounter->inc(l_librbd_rd_bytes, mylen); + return total_read; + } + + // validate extent against image size; clip to image size if necessary + int clip_io(ImageCtx *ictx, uint64_t off, uint64_t *len) + { + ceph_assert(ceph_mutex_is_locked(ictx->image_lock)); + + if (ictx->snap_id != CEPH_NOSNAP && + ictx->get_snap_info(ictx->snap_id) == nullptr) { + return -ENOENT; + } + uint64_t image_size = ictx->get_effective_image_size(ictx->snap_id); + + // special-case "len == 0" requests: always valid + if (*len == 0) + return 0; + + // can't start past end + if (off >= image_size) + return -EINVAL; + + // clip requests that extend past end to just end + if ((off + *len) > image_size) + *len = (size_t)(image_size - off); + + return 0; + } + + int invalidate_cache(ImageCtx *ictx) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << "invalidate_cache " << ictx << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + C_SaferCond ctx; + { + ictx->io_image_dispatcher->invalidate_cache(&ctx); + } + r = ctx.wait(); + + if (r < 0) { + ldout(cct, 20) << "failed to invalidate image cache" << dendl; + return r; + } + + ictx->perfcounter->inc(l_librbd_invalidate_cache); + + // Delete writeback cache if it is not initialized + if ((!ictx->exclusive_lock || + !ictx->exclusive_lock->is_lock_owner()) && + ictx->test_features(RBD_FEATURE_DIRTY_CACHE)) { + C_SaferCond ctx3; + ictx->plugin_registry->discard(&ctx3); + r = ctx3.wait(); + } + return r; + } + + int poll_io_events(ImageCtx *ictx, io::AioCompletion **comps, int numcomp) + { + if (numcomp <= 0) + return -EINVAL; + CephContext *cct = ictx->cct; + ldout(cct, 20) << __func__ << " " << ictx << " numcomp = " << numcomp + << dendl; + int i = 0; + while (i < numcomp && ictx->event_socket_completions.pop(comps[i])) { + ++i; + } + + return i; + } + + int metadata_get(ImageCtx *ictx, const string &key, string *value) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << "metadata_get " << ictx << " key=" << key << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + return cls_client::metadata_get(&ictx->md_ctx, ictx->header_oid, key, value); + } + + int metadata_list(ImageCtx *ictx, const string &start, uint64_t max, map<string, bufferlist> *pairs) + { + CephContext *cct = ictx->cct; + ldout(cct, 20) << "metadata_list " << ictx << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + C_SaferCond ctx; + auto req = image::GetMetadataRequest<>::create( + ictx->md_ctx, ictx->header_oid, false, "", start, max, pairs, &ctx); + req->send(); + + return ctx.wait(); + } + + int list_watchers(ImageCtx *ictx, + std::list<librbd::image_watcher_t> &watchers) + { + int r; + std::string header_oid; + std::list<obj_watch_t> obj_watchers; + + if (ictx->old_format) { + header_oid = util::old_header_name(ictx->name); + } else { + header_oid = util::header_name(ictx->id); + } + + r = ictx->md_ctx.list_watchers(header_oid, &obj_watchers); + if (r < 0) { + return r; + } + + for (auto i = obj_watchers.begin(); i != obj_watchers.end(); ++i) { + librbd::image_watcher_t watcher; + watcher.addr = i->addr; + watcher.id = i->watcher_id; + watcher.cookie = i->cookie; + + watchers.push_back(watcher); + } + + return 0; + } + +} + +std::ostream &operator<<(std::ostream &os, const librbd::ImageOptions &opts) { + os << "["; + + const char *delimiter = ""; + for (auto &i : librbd::IMAGE_OPTIONS_TYPE_MAPPING) { + if (i.second == librbd::STR) { + std::string val; + if (opts.get(i.first, &val) == 0) { + os << delimiter << librbd::image_option_name(i.first) << "=" << val; + delimiter = ", "; + } + } else if (i.second == librbd::UINT64) { + uint64_t val; + if (opts.get(i.first, &val) == 0) { + os << delimiter << librbd::image_option_name(i.first) << "=" << val; + delimiter = ", "; + } + } + } + + os << "]"; + + return os; +} |