include/linux/ceph/ceph_features.h

#ifndef __CEPH_FEATURES
#define __CEPH_FEATURES

/*
 * Each time we reclaim bits for reuse we need to specify another bit
 * that, if present, indicates we have the new incarnation of that
 * feature.  Base case is 1 (first use).
 */
#define CEPH_FEATURE_INCARNATION_1 (0ull)
#define CEPH_FEATURE_INCARNATION_2 (1ull<<57) // CEPH_FEATURE_SERVER_JEWEL

#define DEFINE_CEPH_FEATURE(bit, incarnation, name)			\
	const static uint64_t CEPH_FEATURE_##name = (1ULL<<bit);		\
	const static uint64_t CEPH_FEATUREMASK_##name =			\
		(1ULL<<bit | CEPH_FEATURE_INCARNATION_##incarnation);

/* this bit is ignored but still advertised by release *when* */
#define DEFINE_CEPH_FEATURE_DEPRECATED(bit, incarnation, name, when) \
	const static uint64_t DEPRECATED_CEPH_FEATURE_##name = (1ULL<<bit); \
	const static uint64_t DEPRECATED_CEPH_FEATUREMASK_##name =		\
		(1ULL<<bit | CEPH_FEATURE_INCARNATION_##incarnation);

/*
 * this bit is ignored by release *unused* and not advertised by
 * release *unadvertised*
 */
#define DEFINE_CEPH_FEATURE_RETIRED(bit, inc, name, unused, unadvertised)


/*
 * test for a feature.  this test is safer than a typical mask against
 * the bit because it ensures that we have the bit AND the marker for the
 * bit's incarnation.  this must be used in any case where the features
 * bits may include an old meaning of the bit.
 */
#define CEPH_HAVE_FEATURE(x, name)			\
	(((x) & (CEPH_FEATUREMASK_##name)) == (CEPH_FEATUREMASK_##name))


/*
 * Notes on deprecation:
 *
 * A *major* release is a release through which all upgrades must pass
 * (e.g., jewel).  For example, no pre-jewel server will ever talk to
 * a post-jewel server (mon, osd, etc).
 *
 * For feature bits used *only* on the server-side:
 *
 *  - In the first phase we indicate that a feature is DEPRECATED as of
 *    a particular release.  This is the first major release X (say,
 *    jewel) that does not depend on its peers advertising the feature.
 *    That is, it safely assumes its peers all have the feature.  We
 *    indicate this with the DEPRECATED macro.  For example,
 *
 *      DEFINE_CEPH_FEATURE_DEPRECATED( 2, 1, MONCLOCKCHECK, JEWEL)
 *
 *    because 10.2.z (jewel) did not care if its peers advertised this
 *    feature bit.
 *
 *  - In the second phase we stop advertising the the bit and call it
 *    RETIRED.  This can normally be done in the *next* major release
 *    following the one in which we marked the feature DEPRECATED.  In
 *    the above example, for 12.0.z (luminous) we can say:
 *
 *      DEFINE_CEPH_FEATURE_RETIRED( 2, 1, MONCLOCKCHECK, JEWEL, LUMINOUS)
 *
 *  - The bit can be reused in the first post-luminous release, 13.0.z
 *    (m).
 *
 * This ensures that no two versions who have different meanings for
 * the bit ever speak to each other.
 */

DEFINE_CEPH_FEATURE( 0, 1, UID)
DEFINE_CEPH_FEATURE( 1, 1, NOSRCADDR)
DEFINE_CEPH_FEATURE_RETIRED( 2, 1, MONCLOCKCHECK, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE( 3, 1, FLOCK)
DEFINE_CEPH_FEATURE( 4, 1, SUBSCRIBE2)
DEFINE_CEPH_FEATURE( 5, 1, MONNAMES)
DEFINE_CEPH_FEATURE( 6, 1, RECONNECT_SEQ)
DEFINE_CEPH_FEATURE( 7, 1, DIRLAYOUTHASH)
DEFINE_CEPH_FEATURE( 8, 1, OBJECTLOCATOR)
DEFINE_CEPH_FEATURE( 9, 1, PGID64)
DEFINE_CEPH_FEATURE(10, 1, INCSUBOSDMAP)
DEFINE_CEPH_FEATURE(11, 1, PGPOOL3)
DEFINE_CEPH_FEATURE(12, 1, OSDREPLYMUX)
DEFINE_CEPH_FEATURE(13, 1, OSDENC)
DEFINE_CEPH_FEATURE_RETIRED(14, 1, OMAP, HAMMER, JEWEL)
DEFINE_CEPH_FEATURE(14, 2, SERVER_KRAKEN)
DEFINE_CEPH_FEATURE(15, 1, MONENC)
DEFINE_CEPH_FEATURE_RETIRED(16, 1, QUERY_T, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE_RETIRED(17, 1, INDEP_PG_MAP, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE(18, 1, CRUSH_TUNABLES)
DEFINE_CEPH_FEATURE_RETIRED(19, 1, CHUNKY_SCRUB, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE_RETIRED(20, 1, MON_NULLROUTE, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE_RETIRED(21, 1, MON_GV, HAMMER, JEWEL)
DEFINE_CEPH_FEATURE(21, 2, SERVER_LUMINOUS)
DEFINE_CEPH_FEATURE(21, 2, RESEND_ON_SPLIT)  // overlap
DEFINE_CEPH_FEATURE(21, 2, RADOS_BACKOFF)    // overlap
DEFINE_CEPH_FEATURE(21, 2, OSDMAP_PG_UPMAP)  // overlap
DEFINE_CEPH_FEATURE(21, 2, CRUSH_CHOOSE_ARGS) // overlap
DEFINE_CEPH_FEATURE_RETIRED(22, 1, BACKFILL_RESERVATION, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE(23, 1, MSG_AUTH)
DEFINE_CEPH_FEATURE_RETIRED(24, 1, RECOVERY_RESERVATION, JEWEL, LUNINOUS)

DEFINE_CEPH_FEATURE(25, 1, CRUSH_TUNABLES2)
DEFINE_CEPH_FEATURE(26, 1, CREATEPOOLID)
DEFINE_CEPH_FEATURE(27, 1, REPLY_CREATE_INODE)
DEFINE_CEPH_FEATURE_RETIRED(28, 1, OSD_HBMSGS, HAMMER, JEWEL)
DEFINE_CEPH_FEATURE(28, 2, SERVER_M)
DEFINE_CEPH_FEATURE(29, 1, MDSENC)
DEFINE_CEPH_FEATURE(30, 1, OSDHASHPSPOOL)
DEFINE_CEPH_FEATURE(31, 1, MON_SINGLE_PAXOS)  // deprecate me
DEFINE_CEPH_FEATURE_RETIRED(32, 1, OSD_SNAPMAPPER, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE_RETIRED(33, 1, MON_SCRUB, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE_RETIRED(34, 1, OSD_PACKED_RECOVERY, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE(35, 1, OSD_CACHEPOOL)
DEFINE_CEPH_FEATURE(36, 1, CRUSH_V2)
DEFINE_CEPH_FEATURE(37, 1, EXPORT_PEER)
DEFINE_CEPH_FEATURE(38, 1, OSD_ERASURE_CODES)
DEFINE_CEPH_FEATURE(38, 1, OSD_OSD_TMAP2OMAP) // overlap
DEFINE_CEPH_FEATURE(39, 1, OSDMAP_ENC)
DEFINE_CEPH_FEATURE(40, 1, MDS_INLINE_DATA)
DEFINE_CEPH_FEATURE(41, 1, CRUSH_TUNABLES3)
DEFINE_CEPH_FEATURE(41, 1, OSD_PRIMARY_AFFINITY) // overlap
DEFINE_CEPH_FEATURE(42, 1, MSGR_KEEPALIVE2)
DEFINE_CEPH_FEATURE(43, 1, OSD_POOLRESEND)
DEFINE_CEPH_FEATURE(44, 1, ERASURE_CODE_PLUGINS_V2)
DEFINE_CEPH_FEATURE_RETIRED(45, 1, OSD_SET_ALLOC_HINT, JEWEL, LUMINOUS)

DEFINE_CEPH_FEATURE(46, 1, OSD_FADVISE_FLAGS)
DEFINE_CEPH_FEATURE_RETIRED(46, 1, OSD_REPOP, JEWEL, LUMINOUS) // overlap
DEFINE_CEPH_FEATURE_RETIRED(46, 1, OSD_OBJECT_DIGEST, JEWEL, LUMINOUS) // overlap
DEFINE_CEPH_FEATURE_RETIRED(46, 1, OSD_TRANSACTION_MAY_LAYOUT, JEWEL, LUMINOUS) // overlap

DEFINE_CEPH_FEATURE(47, 1, MDS_QUOTA)
DEFINE_CEPH_FEATURE(48, 1, CRUSH_V4)
DEFINE_CEPH_FEATURE_RETIRED(49, 1, OSD_MIN_SIZE_RECOVERY, JEWEL, LUMINOUS)
DEFINE_CEPH_FEATURE_RETIRED(49, 1, OSD_PROXY_FEATURES, JEWEL, LUMINOUS) // overlap

DEFINE_CEPH_FEATURE(50, 1, MON_METADATA)
DEFINE_CEPH_FEATURE(51, 1, OSD_BITWISE_HOBJ_SORT)
DEFINE_CEPH_FEATURE(52, 1, OSD_PROXY_WRITE_FEATURES)
DEFINE_CEPH_FEATURE(53, 1, ERASURE_CODE_PLUGINS_V3)
DEFINE_CEPH_FEATURE(54, 1, OSD_HITSET_GMT)
DEFINE_CEPH_FEATURE(55, 1, HAMMER_0_94_4)
DEFINE_CEPH_FEATURE(56, 1, NEW_OSDOP_ENCODING)
DEFINE_CEPH_FEATURE(57, 1, MON_STATEFUL_SUB)
DEFINE_CEPH_FEATURE(57, 1, MON_ROUTE_OSDMAP) // overlap
DEFINE_CEPH_FEATURE(57, 1, OSDSUBOP_NO_SNAPCONTEXT) // overlap
DEFINE_CEPH_FEATURE(57, 1, SERVER_JEWEL) // overlap
DEFINE_CEPH_FEATURE(58, 1, CRUSH_TUNABLES5)
DEFINE_CEPH_FEATURE(58, 1, NEW_OSDOPREPLY_ENCODING) // overlap
DEFINE_CEPH_FEATURE(58, 1, FS_FILE_LAYOUT_V2) // overlap
DEFINE_CEPH_FEATURE(59, 1, FS_BTIME)
DEFINE_CEPH_FEATURE(59, 1, FS_CHANGE_ATTR) // overlap
DEFINE_CEPH_FEATURE(59, 1, MSG_ADDR2) // overlap
DEFINE_CEPH_FEATURE(60, 1, BLKIN_TRACING)  // *do not share this bit*

DEFINE_CEPH_FEATURE(61, 1, RESERVED2)          // unused, but slow down!
DEFINE_CEPH_FEATURE(62, 1, RESERVED)           // do not use; used as a sentinal
DEFINE_CEPH_FEATURE_DEPRECATED(63, 1, RESERVED_BROKEN, LUMINOUS) // client-facing


/*
 * Features supported.
 */
#define CEPH_FEATURES_SUPPORTED_DEFAULT		\
	(CEPH_FEATURE_NOSRCADDR |		\
	 CEPH_FEATURE_FLOCK |			\
	 CEPH_FEATURE_SUBSCRIBE2 |		\
	 CEPH_FEATURE_RECONNECT_SEQ |		\
	 CEPH_FEATURE_DIRLAYOUTHASH |		\
	 CEPH_FEATURE_PGID64 |			\
	 CEPH_FEATURE_PGPOOL3 |			\
	 CEPH_FEATURE_OSDENC |			\
	 CEPH_FEATURE_CRUSH_TUNABLES |		\
	 CEPH_FEATURE_SERVER_LUMINOUS |		\
	 CEPH_FEATURE_RESEND_ON_SPLIT |		\
	 CEPH_FEATURE_RADOS_BACKOFF |		\
	 CEPH_FEATURE_OSDMAP_PG_UPMAP |		\
	 CEPH_FEATURE_CRUSH_CHOOSE_ARGS |	\
	 CEPH_FEATURE_MSG_AUTH |		\
	 CEPH_FEATURE_CRUSH_TUNABLES2 |		\
	 CEPH_FEATURE_REPLY_CREATE_INODE |	\
	 CEPH_FEATURE_MDSENC |			\
	 CEPH_FEATURE_OSDHASHPSPOOL |		\
	 CEPH_FEATURE_OSD_CACHEPOOL |		\
	 CEPH_FEATURE_CRUSH_V2 |		\
	 CEPH_FEATURE_EXPORT_PEER |		\
	 CEPH_FEATURE_OSDMAP_ENC |		\
	 CEPH_FEATURE_MDS_INLINE_DATA |		\
	 CEPH_FEATURE_CRUSH_TUNABLES3 |		\
	 CEPH_FEATURE_OSD_PRIMARY_AFFINITY |	\
	 CEPH_FEATURE_MSGR_KEEPALIVE2 |		\
	 CEPH_FEATURE_OSD_POOLRESEND |		\
	 CEPH_FEATURE_CRUSH_V4 |		\
	 CEPH_FEATURE_NEW_OSDOP_ENCODING |	\
	 CEPH_FEATURE_SERVER_JEWEL |		\
	 CEPH_FEATURE_MON_STATEFUL_SUB |	\
	 CEPH_FEATURE_CRUSH_TUNABLES5 |		\
	 CEPH_FEATURE_NEW_OSDOPREPLY_ENCODING)

#define CEPH_FEATURES_REQUIRED_DEFAULT   \
	(CEPH_FEATURE_NOSRCADDR |	 \
	 CEPH_FEATURE_SUBSCRIBE2 |	 \
	 CEPH_FEATURE_RECONNECT_SEQ |	 \
	 CEPH_FEATURE_PGID64 |		 \
	 CEPH_FEATURE_PGPOOL3 |		 \
	 CEPH_FEATURE_OSDENC)

#endif