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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+#ifndef CEPH_OBJECTSTORE_H
+#define CEPH_OBJECTSTORE_H
+
+#include "include/buffer.h"
+#include "include/common_fwd.h"
+#include "include/Context.h"
+#include "include/interval_set.h"
+#include "include/stringify.h"
+#include "include/types.h"
+
+#include "osd/osd_types.h"
+#include "common/TrackedOp.h"
+#include "common/WorkQueue.h"
+#include "ObjectMap.h"
+#include "os/Transaction.h"
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <vector>
+#include <map>
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun) || defined(_WIN32)
+#include <sys/statvfs.h>
+#else
+#include <sys/vfs.h> /* or <sys/statfs.h> */
+#endif
+
+namespace ceph {
+ class Formatter;
+}
+
+/*
+ * low-level interface to the local OSD file system
+ */
+
+class Logger;
+class ContextQueue;
+
+static inline void encode(const std::map<std::string,ceph::buffer::ptr> *attrset, ceph::buffer::list &bl) {
+ using ceph::encode;
+ encode(*attrset, bl);
+}
+
+// Flag bits
+typedef uint32_t osflagbits_t;
+const int SKIP_JOURNAL_REPLAY = 1 << 0;
+const int SKIP_MOUNT_OMAP = 1 << 1;
+
+class ObjectStore {
+protected:
+ std::string path;
+
+public:
+ using Transaction = ceph::os::Transaction;
+
+ CephContext* cct;
+ /**
+ * create - create an ObjectStore instance.
+ *
+ * This is invoked once at initialization time.
+ *
+ * @param type type of store. This is a std::string from the configuration file.
+ * @param data path (or other descriptor) for data
+ * @param journal path (or other descriptor) for journal (optional)
+ * @param flags which filestores should check if applicable
+ */
+ static ObjectStore *create(CephContext *cct,
+ const std::string& type,
+ const std::string& data,
+ const std::string& journal,
+ osflagbits_t flags = 0);
+
+ /**
+ * probe a block device to learn the uuid of the owning OSD
+ *
+ * @param cct cct
+ * @param path path to device
+ * @param fsid [out] osd uuid
+ */
+ static int probe_block_device_fsid(
+ CephContext *cct,
+ const std::string& path,
+ uuid_d *fsid);
+
+ /**
+ * Fetch Object Store statistics.
+ *
+ * Currently only latency of write and apply times are measured.
+ *
+ * This appears to be called with nothing locked.
+ */
+ virtual objectstore_perf_stat_t get_cur_stats() = 0;
+
+ /**
+ * Fetch Object Store performance counters.
+ *
+ *
+ * This appears to be called with nothing locked.
+ */
+ virtual const PerfCounters* get_perf_counters() const = 0;
+
+ /**
+ * a collection also orders transactions
+ *
+ * Any transactions queued under a given collection will be applied in
+ * sequence. Transactions queued under different collections may run
+ * in parallel.
+ *
+ * ObjectStore users may get collection handles with open_collection() (or,
+ * for bootstrapping a new collection, create_new_collection()).
+ */
+ struct CollectionImpl : public RefCountedObject {
+ const coll_t cid;
+
+ /// wait for any queued transactions to apply
+ // block until any previous transactions are visible. specifically,
+ // collection_list and collection_empty need to reflect prior operations.
+ virtual void flush() = 0;
+
+ /**
+ * Async flush_commit
+ *
+ * There are two cases:
+ * 1) collection is currently idle: the method returns true. c is
+ * not touched.
+ * 2) collection is not idle: the method returns false and c is
+ * called asynchronously with a value of 0 once all transactions
+ * queued on this collection prior to the call have been applied
+ * and committed.
+ */
+ virtual bool flush_commit(Context *c) = 0;
+
+ const coll_t &get_cid() {
+ return cid;
+ }
+ protected:
+ CollectionImpl() = delete;
+ CollectionImpl(CephContext* cct, const coll_t& c) : RefCountedObject(cct), cid(c) {}
+ ~CollectionImpl() = default;
+ };
+ using CollectionHandle = ceph::ref_t<CollectionImpl>;
+
+
+ /*********************************
+ *
+ * Object Contents and semantics
+ *
+ * All ObjectStore objects are identified as a named object
+ * (ghobject_t and hobject_t) in a named collection (coll_t).
+ * ObjectStore operations support the creation, mutation, deletion
+ * and enumeration of objects within a collection. Enumeration is
+ * in sorted key order (where keys are sorted by hash). Object names
+ * are globally unique.
+ *
+ * Each object has four distinct parts: byte data, xattrs, omap_header
+ * and omap entries.
+ *
+ * The data portion of an object is conceptually equivalent to a
+ * file in a file system. Random and Partial access for both read
+ * and write operations is required. The ability to have a sparse
+ * implementation of the data portion of an object is beneficial for
+ * some workloads, but not required. There is a system-wide limit on
+ * the maximum size of an object, which is typically around 100 MB.
+ *
+ * Xattrs are equivalent to the extended attributes of file
+ * systems. Xattrs are a std::set of key/value pairs. Sub-value access
+ * is not required. It is possible to enumerate the std::set of xattrs in
+ * key order. At the implementation level, xattrs are used
+ * exclusively internal to Ceph and the implementer can expect the
+ * total size of all of the xattrs on an object to be relatively
+ * small, i.e., less than 64KB. Much of Ceph assumes that accessing
+ * xattrs on temporally adjacent object accesses (recent past or
+ * near future) is inexpensive.
+ *
+ * omap_header is a single blob of data. It can be read or written
+ * in total.
+ *
+ * Omap entries are conceptually the same as xattrs
+ * but in a different address space. In other words, you can have
+ * the same key as an xattr and an omap entry and they have distinct
+ * values. Enumeration of xattrs doesn't include omap entries and
+ * vice versa. The size and access characteristics of omap entries
+ * are very different from xattrs. In particular, the value portion
+ * of an omap entry can be quite large (MBs). More importantly, the
+ * interface must support efficient range queries on omap entries even
+ * when there are a large numbers of entries.
+ *
+ *********************************/
+
+ /*******************************
+ *
+ * Collections
+ *
+ * A collection is simply a grouping of objects. Collections have
+ * names (coll_t) and can be enumerated in order. Like an
+ * individual object, a collection also has a std::set of xattrs.
+ *
+ *
+ */
+
+
+ int queue_transaction(CollectionHandle& ch,
+ Transaction&& t,
+ TrackedOpRef op = TrackedOpRef(),
+ ThreadPool::TPHandle *handle = NULL) {
+ std::vector<Transaction> tls;
+ tls.push_back(std::move(t));
+ return queue_transactions(ch, tls, op, handle);
+ }
+
+ virtual int queue_transactions(
+ CollectionHandle& ch, std::vector<Transaction>& tls,
+ TrackedOpRef op = TrackedOpRef(),
+ ThreadPool::TPHandle *handle = NULL) = 0;
+
+
+ public:
+ ObjectStore(CephContext* cct,
+ const std::string& path_) : path(path_), cct(cct) {}
+ virtual ~ObjectStore() {}
+
+ // no copying
+ explicit ObjectStore(const ObjectStore& o) = delete;
+ const ObjectStore& operator=(const ObjectStore& o) = delete;
+
+ // versioning
+ virtual int upgrade() {
+ return 0;
+ }
+
+ virtual void get_db_statistics(ceph::Formatter *f) { }
+ virtual void generate_db_histogram(ceph::Formatter *f) { }
+ virtual int flush_cache(std::ostream *os = NULL) { return -1; }
+ virtual void dump_perf_counters(ceph::Formatter *f) {}
+ virtual void dump_cache_stats(ceph::Formatter *f) {}
+ virtual void dump_cache_stats(std::ostream& os) {}
+
+ virtual std::string get_type() = 0;
+
+ // mgmt
+ virtual bool test_mount_in_use() = 0;
+ virtual int mount() = 0;
+ virtual int umount() = 0;
+ virtual int fsck(bool deep) {
+ return -EOPNOTSUPP;
+ }
+ virtual int repair(bool deep) {
+ return -EOPNOTSUPP;
+ }
+ virtual int quick_fix() {
+ return -EOPNOTSUPP;
+ }
+
+ virtual void set_cache_shards(unsigned num) { }
+
+ /**
+ * Returns 0 if the hobject is valid, -error otherwise
+ *
+ * Errors:
+ * -ENAMETOOLONG: locator/namespace/name too large
+ */
+ virtual int validate_hobject_key(const hobject_t &obj) const = 0;
+
+ virtual unsigned get_max_attr_name_length() = 0;
+ virtual int mkfs() = 0; // wipe
+ virtual int mkjournal() = 0; // journal only
+ virtual bool needs_journal() = 0; //< requires a journal
+ virtual bool wants_journal() = 0; //< prefers a journal
+ virtual bool allows_journal() = 0; //< allows a journal
+
+ // return store min allocation size, if applicable
+ virtual uint64_t get_min_alloc_size() const {
+ return 0;
+ }
+
+ /// enumerate hardware devices (by 'devname', e.g., 'sda' as in /sys/block/sda)
+ virtual int get_devices(std::set<std::string> *devls) {
+ return -EOPNOTSUPP;
+ }
+
+ /// true if a txn is readable immediately after it is queued.
+ virtual bool is_sync_onreadable() const {
+ return true;
+ }
+
+ /**
+ * is_rotational
+ *
+ * Check whether store is backed by a rotational (HDD) or non-rotational
+ * (SSD) device.
+ *
+ * This must be usable *before* the store is mounted.
+ *
+ * @return true for HDD, false for SSD
+ */
+ virtual bool is_rotational() {
+ return true;
+ }
+
+ /**
+ * is_journal_rotational
+ *
+ * Check whether journal is backed by a rotational (HDD) or non-rotational
+ * (SSD) device.
+ *
+ *
+ * @return true for HDD, false for SSD
+ */
+ virtual bool is_journal_rotational() {
+ return true;
+ }
+
+ virtual std::string get_default_device_class() {
+ return is_rotational() ? "hdd" : "ssd";
+ }
+
+ virtual int get_numa_node(
+ int *numa_node,
+ std::set<int> *nodes,
+ std::set<std::string> *failed) {
+ return -EOPNOTSUPP;
+ }
+
+
+ virtual bool can_sort_nibblewise() {
+ return false; // assume a backend cannot, unless it says otherwise
+ }
+
+ virtual int statfs(struct store_statfs_t *buf,
+ osd_alert_list_t* alerts = nullptr) = 0;
+ virtual int pool_statfs(uint64_t pool_id, struct store_statfs_t *buf,
+ bool *per_pool_omap) = 0;
+
+ virtual void collect_metadata(std::map<std::string,std::string> *pm) { }
+
+ /**
+ * write_meta - write a simple configuration key out-of-band
+ *
+ * Write a simple key/value pair for basic store configuration
+ * (e.g., a uuid or magic number) to an unopened/unmounted store.
+ * The default implementation writes this to a plaintext file in the
+ * path.
+ *
+ * A newline is appended.
+ *
+ * @param key key name (e.g., "fsid")
+ * @param value value (e.g., a uuid rendered as a std::string)
+ * @returns 0 for success, or an error code
+ */
+ virtual int write_meta(const std::string& key,
+ const std::string& value);
+
+ /**
+ * read_meta - read a simple configuration key out-of-band
+ *
+ * Read a simple key value to an unopened/mounted store.
+ *
+ * Trailing whitespace is stripped off.
+ *
+ * @param key key name
+ * @param value pointer to value std::string
+ * @returns 0 for success, or an error code
+ */
+ virtual int read_meta(const std::string& key,
+ std::string *value);
+
+ /**
+ * get ideal max value for collection_list()
+ *
+ * default to some arbitrary values; the implementation will override.
+ */
+ virtual int get_ideal_list_max() { return 64; }
+
+
+ /**
+ * get a collection handle
+ *
+ * Provide a trivial handle as a default to avoid converting legacy
+ * implementations.
+ */
+ virtual CollectionHandle open_collection(const coll_t &cid) = 0;
+
+ /**
+ * get a collection handle for a soon-to-be-created collection
+ *
+ * This handle must be used by queue_transaction that includes a
+ * create_collection call in order to become valid. It will become the
+ * reference to the created collection.
+ */
+ virtual CollectionHandle create_new_collection(const coll_t &cid) = 0;
+
+ /**
+ * std::set ContextQueue for a collection
+ *
+ * After that, oncommits of Transaction will queue into commit_queue.
+ * And osd ShardThread will call oncommits.
+ */
+ virtual void set_collection_commit_queue(const coll_t &cid, ContextQueue *commit_queue) = 0;
+
+ /**
+ * Synchronous read operations
+ */
+
+ /**
+ * exists -- Test for existance of object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @returns true if object exists, false otherwise
+ */
+ virtual bool exists(CollectionHandle& c, const ghobject_t& oid) = 0;
+ /**
+ * set_collection_opts -- std::set pool options for a collectioninformation for an object
+ *
+ * @param cid collection
+ * @param opts new collection options
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int set_collection_opts(
+ CollectionHandle& c,
+ const pool_opts_t& opts) = 0;
+
+ /**
+ * stat -- get information for an object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param st output information for the object
+ * @param allow_eio if false, assert on -EIO operation failure
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int stat(
+ CollectionHandle &c,
+ const ghobject_t& oid,
+ struct stat *st,
+ bool allow_eio = false) = 0;
+ /**
+ * read -- read a byte range of data from an object
+ *
+ * Note: if reading from an offset past the end of the object, we
+ * return 0 (not, say, -EINVAL).
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param offset location offset of first byte to be read
+ * @param len number of bytes to be read
+ * @param bl output ceph::buffer::list
+ * @param op_flags is CEPH_OSD_OP_FLAG_*
+ * @returns number of bytes read on success, or negative error code on failure.
+ */
+ virtual int read(
+ CollectionHandle &c,
+ const ghobject_t& oid,
+ uint64_t offset,
+ size_t len,
+ ceph::buffer::list& bl,
+ uint32_t op_flags = 0) = 0;
+
+ /**
+ * fiemap -- get extent std::map of data of an object
+ *
+ * Returns an encoded std::map of the extents of an object's data portion
+ * (std::map<offset,size>).
+ *
+ * A non-enlightened implementation is free to return the extent (offset, len)
+ * as the sole extent.
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param offset location offset of first byte to be read
+ * @param len number of bytes to be read
+ * @param bl output ceph::buffer::list for extent std::map information.
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int fiemap(CollectionHandle& c, const ghobject_t& oid,
+ uint64_t offset, size_t len, ceph::buffer::list& bl) = 0;
+ virtual int fiemap(CollectionHandle& c, const ghobject_t& oid,
+ uint64_t offset, size_t len, std::map<uint64_t, uint64_t>& destmap) = 0;
+
+ /**
+ * readv -- read specfic intervals from an object;
+ * caller must call fiemap to fill in the extent-map first.
+ *
+ * Note: if reading from an offset past the end of the object, we
+ * return 0 (not, say, -EINVAL). Also the default version of readv
+ * reads each extent separately synchronously, which can become horribly
+ * inefficient if the physical layout of the pushing object get massively
+ * fragmented and hence should be overridden by any real os that
+ * cares about the performance..
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param m intervals to be read
+ * @param bl output ceph::buffer::list
+ * @param op_flags is CEPH_OSD_OP_FLAG_*
+ * @returns number of bytes read on success, or negative error code on failure.
+ */
+ virtual int readv(
+ CollectionHandle &c,
+ const ghobject_t& oid,
+ interval_set<uint64_t>& m,
+ ceph::buffer::list& bl,
+ uint32_t op_flags = 0) {
+ int total = 0;
+ for (auto p = m.begin(); p != m.end(); p++) {
+ ceph::buffer::list t;
+ int r = read(c, oid, p.get_start(), p.get_len(), t, op_flags);
+ if (r < 0)
+ return r;
+ total += r;
+ // prune fiemap, if necessary
+ if (p.get_len() != t.length()) {
+ auto save = p++;
+ if (t.length() == 0) {
+ m.erase(save); // Remove this empty interval
+ } else {
+ save.set_len(t.length()); // fix interval length
+ bl.claim_append(t);
+ }
+ // Remove any other follow-up intervals present too
+ while (p != m.end()) {
+ save = p++;
+ m.erase(save);
+ }
+ break;
+ }
+ bl.claim_append(t);
+ }
+ return total;
+ }
+
+ /**
+ * dump_onode -- dumps onode metadata in human readable form,
+ intended primiarily for debugging
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param section_name section name to create and print under
+ * @param f Formatter class instance to print to
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int dump_onode(
+ CollectionHandle &c,
+ const ghobject_t& oid,
+ const std::string& section_name,
+ ceph::Formatter *f) {
+ return -ENOTSUP;
+ }
+
+ /**
+ * getattr -- get an xattr of an object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param name name of attr to read
+ * @param value place to put output result.
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int getattr(CollectionHandle &c, const ghobject_t& oid,
+ const char *name, ceph::buffer::ptr& value) = 0;
+
+ /**
+ * getattr -- get an xattr of an object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param name name of attr to read
+ * @param value place to put output result.
+ * @returns 0 on success, negative error code on failure.
+ */
+ int getattr(
+ CollectionHandle &c, const ghobject_t& oid,
+ const std::string& name, ceph::buffer::list& value) {
+ ceph::buffer::ptr bp;
+ int r = getattr(c, oid, name.c_str(), bp);
+ value.push_back(bp);
+ return r;
+ }
+
+ /**
+ * getattrs -- get all of the xattrs of an object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param aset place to put output result.
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int getattrs(CollectionHandle &c, const ghobject_t& oid,
+ std::map<std::string,ceph::buffer::ptr>& aset) = 0;
+
+ /**
+ * getattrs -- get all of the xattrs of an object
+ *
+ * @param cid collection for object
+ * @param oid oid of object
+ * @param aset place to put output result.
+ * @returns 0 on success, negative error code on failure.
+ */
+ int getattrs(CollectionHandle &c, const ghobject_t& oid,
+ std::map<std::string,ceph::buffer::list>& aset) {
+ std::map<std::string,ceph::buffer::ptr> bmap;
+ int r = getattrs(c, oid, bmap);
+ for (auto i = bmap.begin(); i != bmap.end(); ++i) {
+ aset[i->first].append(i->second);
+ }
+ return r;
+ }
+
+
+ // collections
+
+ /**
+ * list_collections -- get all of the collections known to this ObjectStore
+ *
+ * @param ls std::list of the collections in sorted order.
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int list_collections(std::vector<coll_t>& ls) = 0;
+
+ /**
+ * does a collection exist?
+ *
+ * @param c collection
+ * @returns true if it exists, false otherwise
+ */
+ virtual bool collection_exists(const coll_t& c) = 0;
+
+ /**
+ * is a collection empty?
+ *
+ * @param c collection
+ * @param empty true if the specified collection is empty, false otherwise
+ * @returns 0 on success, negative error code on failure.
+ */
+ virtual int collection_empty(CollectionHandle& c, bool *empty) = 0;
+
+ /**
+ * return the number of significant bits of the coll_t::pgid.
+ *
+ * This should return what the last create_collection or split_collection
+ * std::set. A legacy backend may return -EAGAIN if the value is unavailable
+ * (because we upgraded from an older version, e.g., FileStore).
+ */
+ virtual int collection_bits(CollectionHandle& c) = 0;
+
+
+ /**
+ * std::list contents of a collection that fall in the range [start, end) and no more than a specified many result
+ *
+ * @param c collection
+ * @param start list object that sort >= this value
+ * @param end list objects that sort < this value
+ * @param max return no more than this many results
+ * @param seq return no objects with snap < seq
+ * @param ls [out] result
+ * @param next [out] next item sorts >= this value
+ * @return zero on success, or negative error
+ */
+ virtual int collection_list(CollectionHandle &c,
+ const ghobject_t& start, const ghobject_t& end,
+ int max,
+ std::vector<ghobject_t> *ls, ghobject_t *next) = 0;
+
+ virtual int collection_list_legacy(CollectionHandle &c,
+ const ghobject_t& start,
+ const ghobject_t& end, int max,
+ std::vector<ghobject_t> *ls,
+ ghobject_t *next) {
+ return collection_list(c, start, end, max, ls, next);
+ }
+
+ /// OMAP
+ /// Get omap contents
+ virtual int omap_get(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ ceph::buffer::list *header, ///< [out] omap header
+ std::map<std::string, ceph::buffer::list> *out /// < [out] Key to value std::map
+ ) = 0;
+
+ /// Get omap header
+ virtual int omap_get_header(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ ceph::buffer::list *header, ///< [out] omap header
+ bool allow_eio = false ///< [in] don't assert on eio
+ ) = 0;
+
+ /// Get keys defined on oid
+ virtual int omap_get_keys(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ std::set<std::string> *keys ///< [out] Keys defined on oid
+ ) = 0;
+
+ /// Get key values
+ virtual int omap_get_values(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ const std::set<std::string> &keys, ///< [in] Keys to get
+ std::map<std::string, ceph::buffer::list> *out ///< [out] Returned keys and values
+ ) = 0;
+
+#ifdef WITH_SEASTAR
+ virtual int omap_get_values(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ const std::optional<std::string> &start_after, ///< [in] Keys to get
+ std::map<std::string, ceph::buffer::list> *out ///< [out] Returned keys and values
+ ) = 0;
+#endif
+
+ /// Filters keys into out which are defined on oid
+ virtual int omap_check_keys(
+ CollectionHandle &c, ///< [in] Collection containing oid
+ const ghobject_t &oid, ///< [in] Object containing omap
+ const std::set<std::string> &keys, ///< [in] Keys to check
+ std::set<std::string> *out ///< [out] Subset of keys defined on oid
+ ) = 0;
+
+ /**
+ * Returns an object map iterator
+ *
+ * Warning! The returned iterator is an implicit lock on filestore
+ * operations in c. Do not use filestore methods on c while the returned
+ * iterator is live. (Filling in a transaction is no problem).
+ *
+ * @return iterator, null on error
+ */
+ virtual ObjectMap::ObjectMapIterator get_omap_iterator(
+ CollectionHandle &c, ///< [in] collection
+ const ghobject_t &oid ///< [in] object
+ ) = 0;
+
+ virtual int flush_journal() { return -EOPNOTSUPP; }
+
+ virtual int dump_journal(std::ostream& out) { return -EOPNOTSUPP; }
+
+ virtual int snapshot(const std::string& name) { return -EOPNOTSUPP; }
+
+ /**
+ * Set and get internal fsid for this instance. No external data is modified
+ */
+ virtual void set_fsid(uuid_d u) = 0;
+ virtual uuid_d get_fsid() = 0;
+
+ /**
+ * Estimates additional disk space used by the specified amount of objects and caused by file allocation granularity and metadata store
+ * - num objects - total (including witeouts) object count to measure used space for.
+ */
+ virtual uint64_t estimate_objects_overhead(uint64_t num_objects) = 0;
+
+
+ // DEBUG
+ virtual void inject_data_error(const ghobject_t &oid) {}
+ virtual void inject_mdata_error(const ghobject_t &oid) {}
+
+ virtual void compact() {}
+ virtual bool has_builtin_csum() const {
+ return false;
+ }
+};
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-05 00:48:30 +0000