/* SPDX-License-Identifier: GPL-2.0 */#ifndef CEPH_RADOS_H#define CEPH_RADOS_H /* * Data types for the Ceph distributed object storage layer RADOS * (Reliable Autonomic Distributed Object Store). */ #include <linux/ceph/msgr.h> /* * fs id */struct ceph_fsid { unsigned char fsid[16];}; static inline int ceph_fsid_compare(const struct ceph_fsid *a, const struct ceph_fsid *b){ return memcmp(a, b, sizeof(*a));} /* * ino, object, etc. */typedef __le64 ceph_snapid_t;#define CEPH_SNAPDIR ((__u64)(-1)) /* reserved for hidden .snap dir */#define CEPH_NOSNAP ((__u64)(-2)) /* "head", "live" revision */#define CEPH_MAXSNAP ((__u64)(-3)) /* largest valid snapid */ struct ceph_timespec { __le32 tv_sec; __le32 tv_nsec;} __attribute__ ((packed)); /* * object layout - how objects are mapped into PGs */#define CEPH_OBJECT_LAYOUT_HASH 1#define CEPH_OBJECT_LAYOUT_LINEAR 2#define CEPH_OBJECT_LAYOUT_HASHINO 3 /* * pg layout -- how PGs are mapped onto (sets of) OSDs */#define CEPH_PG_LAYOUT_CRUSH 0#define CEPH_PG_LAYOUT_HASH 1#define CEPH_PG_LAYOUT_LINEAR 2#define CEPH_PG_LAYOUT_HYBRID 3 #define CEPH_PG_MAX_SIZE 32 /* max # osds in a single pg */ /* * placement group. * we encode this into one __le64. */struct ceph_pg_v1 { __le16 preferred; /* preferred primary osd */ __le16 ps; /* placement seed */ __le32 pool; /* object pool */} __attribute__ ((packed)); /* * pg_pool is a set of pgs storing a pool of objects * * pg_num -- base number of pseudorandomly placed pgs * * pgp_num -- effective number when calculating pg placement. this * is used for pg_num increases. new pgs result in data being "split" * into new pgs. for this to proceed smoothly, new pgs are intiially * colocated with their parents; that is, pgp_num doesn't increase * until the new pgs have successfully split. only _then_ are the new * pgs placed independently. * * lpg_num -- localized pg count (per device). replicas are randomly * selected. * * lpgp_num -- as above. */#define CEPH_NOPOOL ((__u64) (-1)) /* pool id not defined */ #define CEPH_POOL_TYPE_REP 1#define CEPH_POOL_TYPE_RAID4 2 /* never implemented */#define CEPH_POOL_TYPE_EC 3 /* * stable_mod func is used to control number of placement groups. * similar to straight-up modulo, but produces a stable mapping as b * increases over time. b is the number of bins, and bmask is the * containing power of 2 minus 1. * * b <= bmask and bmask=(2**n)-1 * e.g., b=12 -> bmask=15, b=123 -> bmask=127 */static inline int ceph_stable_mod(int x, int b, int bmask){ if ((x & bmask) < b) return x & bmask; else return x & (bmask >> 1);} /* * object layout - how a given object should be stored. */struct ceph_object_layout { struct ceph_pg_v1 ol_pgid; /* raw pg, with _full_ ps precision. */ __le32 ol_stripe_unit; /* for per-object parity, if any */} __attribute__ ((packed)); /* * compound epoch+version, used by storage layer to serialize mutations */struct ceph_eversion { __le64 version; __le32 epoch;} __attribute__ ((packed)); /* * osd map bits */ /* status bits */#define CEPH_OSD_EXISTS (1<<0)#define CEPH_OSD_UP (1<<1)#define CEPH_OSD_AUTOOUT (1<<2) /* osd was automatically marked out */#define CEPH_OSD_NEW (1<<3) /* osd is new, never marked in */ extern const char *ceph_osd_state_name(int s); /* osd weights. fixed point value: 0x10000 == 1.0 ("in"), 0 == "out" */#define CEPH_OSD_IN 0x10000#define CEPH_OSD_OUT 0 /* osd primary-affinity. fixed point value: 0x10000 == baseline */#define CEPH_OSD_MAX_PRIMARY_AFFINITY 0x10000#define CEPH_OSD_DEFAULT_PRIMARY_AFFINITY 0x10000 /* * osd map flag bits */#define CEPH_OSDMAP_NEARFULL (1<<0) /* sync writes (near ENOSPC), not set since ~luminous */#define CEPH_OSDMAP_FULL (1<<1) /* no data writes (ENOSPC), not set since ~luminous */#define CEPH_OSDMAP_PAUSERD (1<<2) /* pause all reads */#define CEPH_OSDMAP_PAUSEWR (1<<3) /* pause all writes */#define CEPH_OSDMAP_PAUSEREC (1<<4) /* pause recovery */#define CEPH_OSDMAP_NOUP (1<<5) /* block osd boot */#define CEPH_OSDMAP_NODOWN (1<<6) /* block osd mark-down/failure */#define CEPH_OSDMAP_NOOUT (1<<7) /* block osd auto mark-out */#define CEPH_OSDMAP_NOIN (1<<8) /* block osd auto mark-in */#define CEPH_OSDMAP_NOBACKFILL (1<<9) /* block osd backfill */#define CEPH_OSDMAP_NORECOVER (1<<10) /* block osd recovery and backfill */#define CEPH_OSDMAP_NOSCRUB (1<<11) /* block periodic scrub */#define CEPH_OSDMAP_NODEEP_SCRUB (1<<12) /* block periodic deep-scrub */#define CEPH_OSDMAP_NOTIERAGENT (1<<13) /* disable tiering agent */#define CEPH_OSDMAP_NOREBALANCE (1<<14) /* block osd backfill unless pg is degraded */#define CEPH_OSDMAP_SORTBITWISE (1<<15) /* use bitwise hobject_t sort */#define CEPH_OSDMAP_REQUIRE_JEWEL (1<<16) /* require jewel for booting osds */#define CEPH_OSDMAP_REQUIRE_KRAKEN (1<<17) /* require kraken for booting osds */#define CEPH_OSDMAP_REQUIRE_LUMINOUS (1<<18) /* require l for booting osds */#define CEPH_OSDMAP_RECOVERY_DELETES (1<<19) /* deletes performed during recovery instead of peering */ /* * The error code to return when an OSD can't handle a write * because it is too large. */#define OSD_WRITETOOBIG EMSGSIZE /* * osd ops * * WARNING: do not use these op codes directly. Use the helpers * defined below instead. In certain cases, op code behavior was * redefined, resulting in special-cases in the helpers. */#define CEPH_OSD_OP_MODE 0xf000#define CEPH_OSD_OP_MODE_RD 0x1000#define CEPH_OSD_OP_MODE_WR 0x2000#define CEPH_OSD_OP_MODE_RMW 0x3000#define CEPH_OSD_OP_MODE_SUB 0x4000#define CEPH_OSD_OP_MODE_CACHE 0x8000 #define CEPH_OSD_OP_TYPE 0x0f00#define CEPH_OSD_OP_TYPE_LOCK 0x0100#define CEPH_OSD_OP_TYPE_DATA 0x0200#define CEPH_OSD_OP_TYPE_ATTR 0x0300#define CEPH_OSD_OP_TYPE_EXEC 0x0400#define CEPH_OSD_OP_TYPE_PG 0x0500#define CEPH_OSD_OP_TYPE_MULTI 0x0600 /* multiobject */ #define __CEPH_OSD_OP1(mode, nr) \ (CEPH_OSD_OP_MODE_##mode | (nr)) #define __CEPH_OSD_OP(mode, type, nr) \ (CEPH_OSD_OP_MODE_##mode | CEPH_OSD_OP_TYPE_##type | (nr)) #define __CEPH_FORALL_OSD_OPS(f) \ /** data **/ \ /* read */ \ f(READ, __CEPH_OSD_OP(RD, DATA, 1), "read") \ f(STAT, __CEPH_OSD_OP(RD, DATA, 2), "stat") \ f(MAPEXT, __CEPH_OSD_OP(RD, DATA, 3), "mapext") \ \ /* fancy read */ \ f(MASKTRUNC, __CEPH_OSD_OP(RD, DATA, 4), "masktrunc") \ f(SPARSE_READ, __CEPH_OSD_OP(RD, DATA, 5), "sparse-read") \ \ f(NOTIFY, __CEPH_OSD_OP(RD, DATA, 6), "notify") \ f(NOTIFY_ACK, __CEPH_OSD_OP(RD, DATA, 7), "notify-ack") \ \ /* versioning */ \ f(ASSERT_VER, __CEPH_OSD_OP(RD, DATA, 8), "assert-version") \ \ f(LIST_WATCHERS, __CEPH_OSD_OP(RD, DATA, 9), "list-watchers") \ \ f(LIST_SNAPS, __CEPH_OSD_OP(RD, DATA, 10), "list-snaps") \ \ /* sync */ \ f(SYNC_READ, __CEPH_OSD_OP(RD, DATA, 11), "sync_read") \ \ /* write */ \ f(WRITE, __CEPH_OSD_OP(WR, DATA, 1), "write") \ f(WRITEFULL, __CEPH_OSD_OP(WR, DATA, 2), "writefull") \ f(TRUNCATE, __CEPH_OSD_OP(WR, DATA, 3), "truncate") \ f(ZERO, __CEPH_OSD_OP(WR, DATA, 4), "zero") \ f(DELETE, __CEPH_OSD_OP(WR, DATA, 5), "delete") \ \ /* fancy write */ \ f(APPEND, __CEPH_OSD_OP(WR, DATA, 6), "append") \ f(SETTRUNC, __CEPH_OSD_OP(WR, DATA, 8), "settrunc") \ f(TRIMTRUNC, __CEPH_OSD_OP(WR, DATA, 9), "trimtrunc") \ \ f(TMAPUP, __CEPH_OSD_OP(RMW, DATA, 10), "tmapup") \ f(TMAPPUT, __CEPH_OSD_OP(WR, DATA, 11), "tmapput") \ f(TMAPGET, __CEPH_OSD_OP(RD, DATA, 12), "tmapget") \ \ f(CREATE, __CEPH_OSD_OP(WR, DATA, 13), "create") \ f(ROLLBACK, __CEPH_OSD_OP(WR, DATA, 14), "rollback") \ \ f(WATCH, __CEPH_OSD_OP(WR, DATA, 15), "watch") \ \ /* omap */ \ f(OMAPGETKEYS, __CEPH_OSD_OP(RD, DATA, 17), "omap-get-keys") \ f(OMAPGETVALS, __CEPH_OSD_OP(RD, DATA, 18), "omap-get-vals") \ f(OMAPGETHEADER, __CEPH_OSD_OP(RD, DATA, 19), "omap-get-header") \ f(OMAPGETVALSBYKEYS, __CEPH_OSD_OP(RD, DATA, 20), "omap-get-vals-by-keys") \ f(OMAPSETVALS, __CEPH_OSD_OP(WR, DATA, 21), "omap-set-vals") \ f(OMAPSETHEADER, __CEPH_OSD_OP(WR, DATA, 22), "omap-set-header") \ f(OMAPCLEAR, __CEPH_OSD_OP(WR, DATA, 23), "omap-clear") \ f(OMAPRMKEYS, __CEPH_OSD_OP(WR, DATA, 24), "omap-rm-keys") \ f(OMAP_CMP, __CEPH_OSD_OP(RD, DATA, 25), "omap-cmp") \ \ /* tiering */ \ f(COPY_FROM, __CEPH_OSD_OP(WR, DATA, 26), "copy-from") \ f(COPY_FROM2, __CEPH_OSD_OP(WR, DATA, 45), "copy-from2") \ f(COPY_GET_CLASSIC, __CEPH_OSD_OP(RD, DATA, 27), "copy-get-classic") \ f(UNDIRTY, __CEPH_OSD_OP(WR, DATA, 28), "undirty") \ f(ISDIRTY, __CEPH_OSD_OP(RD, DATA, 29), "isdirty") \ f(COPY_GET, __CEPH_OSD_OP(RD, DATA, 30), "copy-get") \ f(CACHE_FLUSH, __CEPH_OSD_OP(CACHE, DATA, 31), "cache-flush") \ f(CACHE_EVICT, __CEPH_OSD_OP(CACHE, DATA, 32), "cache-evict") \ f(CACHE_TRY_FLUSH, __CEPH_OSD_OP(CACHE, DATA, 33), "cache-try-flush") \ \ /* convert tmap to omap */ \ f(TMAP2OMAP, __CEPH_OSD_OP(RMW, DATA, 34), "tmap2omap") \ \ /* hints */ \ f(SETALLOCHINT, __CEPH_OSD_OP(WR, DATA, 35), "set-alloc-hint") \ \ /** multi **/ \ f(CLONERANGE, __CEPH_OSD_OP(WR, MULTI, 1), "clonerange") \ f(ASSERT_SRC_VERSION, __CEPH_OSD_OP(RD, MULTI, 2), "assert-src-version") \ f(SRC_CMPXATTR, __CEPH_OSD_OP(RD, MULTI, 3), "src-cmpxattr") \ \ /** attrs **/ \ /* read */ \ f(GETXATTR, __CEPH_OSD_OP(RD, ATTR, 1), "getxattr") \ f(GETXATTRS, __CEPH_OSD_OP(RD, ATTR, 2), "getxattrs") \ f(CMPXATTR, __CEPH_OSD_OP(RD, ATTR, 3), "cmpxattr") \ \ /* write */ \ f(SETXATTR, __CEPH_OSD_OP(WR, ATTR, 1), "setxattr") \ f(SETXATTRS, __CEPH_OSD_OP(WR, ATTR, 2), "setxattrs") \ f(RESETXATTRS, __CEPH_OSD_OP(WR, ATTR, 3), "resetxattrs") \ f(RMXATTR, __CEPH_OSD_OP(WR, ATTR, 4), "rmxattr") \ \ /** subop **/ \ f(PULL, __CEPH_OSD_OP1(SUB, 1), "pull") \ f(PUSH, __CEPH_OSD_OP1(SUB, 2), "push") \ f(BALANCEREADS, __CEPH_OSD_OP1(SUB, 3), "balance-reads") \ f(UNBALANCEREADS, __CEPH_OSD_OP1(SUB, 4), "unbalance-reads") \ f(SCRUB, __CEPH_OSD_OP1(SUB, 5), "scrub") \ f(SCRUB_RESERVE, __CEPH_OSD_OP1(SUB, 6), "scrub-reserve") \ f(SCRUB_UNRESERVE, __CEPH_OSD_OP1(SUB, 7), "scrub-unreserve") \ f(SCRUB_STOP, __CEPH_OSD_OP1(SUB, 8), "scrub-stop") \ f(SCRUB_MAP, __CEPH_OSD_OP1(SUB, 9), "scrub-map") \ \ /** lock **/ \ f(WRLOCK, __CEPH_OSD_OP(WR, LOCK, 1), "wrlock") \ f(WRUNLOCK, __CEPH_OSD_OP(WR, LOCK, 2), "wrunlock") \ f(RDLOCK, __CEPH_OSD_OP(WR, LOCK, 3), "rdlock") \ f(RDUNLOCK, __CEPH_OSD_OP(WR, LOCK, 4), "rdunlock") \ f(UPLOCK, __CEPH_OSD_OP(WR, LOCK, 5), "uplock") \ f(DNLOCK, __CEPH_OSD_OP(WR, LOCK, 6), "dnlock") \ \ /** exec **/ \ /* note: the RD bit here is wrong; see special-case below in helper */ \ f(CALL, __CEPH_OSD_OP(RD, EXEC, 1), "call") \ \ /** pg **/ \ f(PGLS, __CEPH_OSD_OP(RD, PG, 1), "pgls") \ f(PGLS_FILTER, __CEPH_OSD_OP(RD, PG, 2), "pgls-filter") \ f(PG_HITSET_LS, __CEPH_OSD_OP(RD, PG, 3), "pg-hitset-ls") \ f(PG_HITSET_GET, __CEPH_OSD_OP(RD, PG, 4), "pg-hitset-get") enum {#define GENERATE_ENUM_ENTRY(op, opcode, str) CEPH_OSD_OP_##op = (opcode),__CEPH_FORALL_OSD_OPS(GENERATE_ENUM_ENTRY)#undef GENERATE_ENUM_ENTRY}; static inline int ceph_osd_op_type_lock(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_LOCK;}static inline int ceph_osd_op_type_data(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_DATA;}static inline int ceph_osd_op_type_attr(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_ATTR;}static inline int ceph_osd_op_type_exec(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_EXEC;}static inline int ceph_osd_op_type_pg(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_PG;}static inline int ceph_osd_op_type_multi(int op){ return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_MULTI;} static inline int ceph_osd_op_mode_subop(int op){ return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_SUB;}static inline int ceph_osd_op_mode_read(int op){ return (op & CEPH_OSD_OP_MODE_RD) && op != CEPH_OSD_OP_CALL;}static inline int ceph_osd_op_mode_modify(int op){ return op & CEPH_OSD_OP_MODE_WR;} /* * note that the following tmap stuff is also defined in the ceph librados.h * any modification here needs to be updated there */#define CEPH_OSD_TMAP_HDR 'h'#define CEPH_OSD_TMAP_SET 's'#define CEPH_OSD_TMAP_CREATE 'c' /* create key */#define CEPH_OSD_TMAP_RM 'r'#define CEPH_OSD_TMAP_RMSLOPPY 'R' extern const char *ceph_osd_op_name(int op); /* * osd op flags * * An op may be READ, WRITE, or READ|WRITE. */enum { CEPH_OSD_FLAG_ACK = 0x0001, /* want (or is) "ack" ack */ CEPH_OSD_FLAG_ONNVRAM = 0x0002, /* want (or is) "onnvram" ack */ CEPH_OSD_FLAG_ONDISK = 0x0004, /* want (or is) "ondisk" ack */ CEPH_OSD_FLAG_RETRY = 0x0008, /* resend attempt */ CEPH_OSD_FLAG_READ = 0x0010, /* op may read */ CEPH_OSD_FLAG_WRITE = 0x0020, /* op may write */ CEPH_OSD_FLAG_ORDERSNAP = 0x0040, /* EOLDSNAP if snapc is out of order */ CEPH_OSD_FLAG_PEERSTAT_OLD = 0x0080, /* DEPRECATED msg includes osd_peer_stat */ CEPH_OSD_FLAG_BALANCE_READS = 0x0100, CEPH_OSD_FLAG_PARALLELEXEC = 0x0200, /* execute op in parallel */ CEPH_OSD_FLAG_PGOP = 0x0400, /* pg op, no object */ CEPH_OSD_FLAG_EXEC = 0x0800, /* op may exec */ CEPH_OSD_FLAG_EXEC_PUBLIC = 0x1000, /* DEPRECATED op may exec (public) */ CEPH_OSD_FLAG_LOCALIZE_READS = 0x2000, /* read from nearby replica, if any */ CEPH_OSD_FLAG_RWORDERED = 0x4000, /* order wrt concurrent reads */ CEPH_OSD_FLAG_IGNORE_CACHE = 0x8000, /* ignore cache logic */ CEPH_OSD_FLAG_SKIPRWLOCKS = 0x10000, /* skip rw locks */ CEPH_OSD_FLAG_IGNORE_OVERLAY = 0x20000, /* ignore pool overlay */ CEPH_OSD_FLAG_FLUSH = 0x40000, /* this is part of flush */ CEPH_OSD_FLAG_MAP_SNAP_CLONE = 0x80000, /* map snap direct to clone id */ CEPH_OSD_FLAG_ENFORCE_SNAPC = 0x100000, /* use snapc provided even if pool uses pool snaps */ CEPH_OSD_FLAG_REDIRECTED = 0x200000, /* op has been redirected */ CEPH_OSD_FLAG_KNOWN_REDIR = 0x400000, /* redirect bit is authoritative */ CEPH_OSD_FLAG_FULL_TRY = 0x800000, /* try op despite full flag */ CEPH_OSD_FLAG_FULL_FORCE = 0x1000000, /* force op despite full flag */}; enum { CEPH_OSD_OP_FLAG_EXCL = 1, /* EXCL object create */ CEPH_OSD_OP_FLAG_FAILOK = 2, /* continue despite failure */ CEPH_OSD_OP_FLAG_FADVISE_RANDOM = 0x4, /* the op is random */ CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL = 0x8, /* the op is sequential */ CEPH_OSD_OP_FLAG_FADVISE_WILLNEED = 0x10,/* data will be accessed in the near future */ CEPH_OSD_OP_FLAG_FADVISE_DONTNEED = 0x20,/* data will not be accessed in the near future */ CEPH_OSD_OP_FLAG_FADVISE_NOCACHE = 0x40,/* data will be accessed only once by this client */}; #define EOLDSNAPC ERESTART /* ORDERSNAP flag set; writer has old snapc*/#define EBLOCKLISTED ESHUTDOWN /* blocklisted */ /* xattr comparison */enum { CEPH_OSD_CMPXATTR_OP_NOP = 0, CEPH_OSD_CMPXATTR_OP_EQ = 1, CEPH_OSD_CMPXATTR_OP_NE = 2, CEPH_OSD_CMPXATTR_OP_GT = 3, CEPH_OSD_CMPXATTR_OP_GTE = 4, CEPH_OSD_CMPXATTR_OP_LT = 5, CEPH_OSD_CMPXATTR_OP_LTE = 6}; enum { CEPH_OSD_CMPXATTR_MODE_STRING = 1, CEPH_OSD_CMPXATTR_MODE_U64 = 2}; enum { CEPH_OSD_COPY_FROM_FLAG_FLUSH = 1, /* part of a flush operation */ CEPH_OSD_COPY_FROM_FLAG_IGNORE_OVERLAY = 2, /* ignore pool overlay */ CEPH_OSD_COPY_FROM_FLAG_IGNORE_CACHE = 4, /* ignore osd cache logic */ CEPH_OSD_COPY_FROM_FLAG_MAP_SNAP_CLONE = 8, /* map snap direct to * cloneid */ CEPH_OSD_COPY_FROM_FLAG_RWORDERED = 16, /* order with write */ CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ = 32, /* send truncate_{seq,size} */}; enum { CEPH_OSD_WATCH_OP_UNWATCH = 0, CEPH_OSD_WATCH_OP_LEGACY_WATCH = 1, /* note: use only ODD ids to prevent pre-giant code from interpreting the op as UNWATCH */ CEPH_OSD_WATCH_OP_WATCH = 3, CEPH_OSD_WATCH_OP_RECONNECT = 5, CEPH_OSD_WATCH_OP_PING = 7,}; const char *ceph_osd_watch_op_name(int o); enum { CEPH_OSD_ALLOC_HINT_FLAG_SEQUENTIAL_WRITE = 1, CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_WRITE = 2, CEPH_OSD_ALLOC_HINT_FLAG_SEQUENTIAL_READ = 4, CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_READ = 8, CEPH_OSD_ALLOC_HINT_FLAG_APPEND_ONLY = 16, CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE = 32, CEPH_OSD_ALLOC_HINT_FLAG_SHORTLIVED = 64, CEPH_OSD_ALLOC_HINT_FLAG_LONGLIVED = 128, CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE = 256, CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE = 512,}; enum { CEPH_OSD_BACKOFF_OP_BLOCK = 1, CEPH_OSD_BACKOFF_OP_ACK_BLOCK = 2, CEPH_OSD_BACKOFF_OP_UNBLOCK = 3,}; /* * an individual object operation. each may be accompanied by some data * payload */struct ceph_osd_op { __le16 op; /* CEPH_OSD_OP_* */ __le32 flags; /* CEPH_OSD_OP_FLAG_* */ union { struct { __le64 offset, length; __le64 truncate_size; __le32 truncate_seq; } __attribute__ ((packed)) extent; struct { __le32 name_len;Lines 1–500 of 551. 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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef CEPH_RADOS_H #define CEPH_RADOS_H /* * Data types for the Ceph distributed object storage layer RADOS * (Reliable Autonomic Distributed Object Store). */ #include <linux/ceph/msgr.h> /* * fs id */ struct ceph_fsid { unsigned char fsid[16]; }; static inline int ceph_fsid_compare(const struct ceph_fsid *a, const struct ceph_fsid *b) { return memcmp(a, b, sizeof(*a)); } /* * ino, object, etc. */ typedef __le64 ceph_snapid_t; #define CEPH_SNAPDIR ((__u64)(-1)) /* reserved for hidden .snap dir */ #define CEPH_NOSNAP ((__u64)(-2)) /* "head", "live" revision */ #define CEPH_MAXSNAP ((__u64)(-3)) /* largest valid snapid */ struct ceph_timespec { __le32 tv_sec; __le32 tv_nsec; } __attribute__ ((packed)); /* * object layout - how objects are mapped into PGs */ #define CEPH_OBJECT_LAYOUT_HASH 1 #define CEPH_OBJECT_LAYOUT_LINEAR 2 #define CEPH_OBJECT_LAYOUT_HASHINO 3 /* * pg layout -- how PGs are mapped onto (sets of) OSDs */ #define CEPH_PG_LAYOUT_CRUSH 0 #define CEPH_PG_LAYOUT_HASH 1 #define CEPH_PG_LAYOUT_LINEAR 2 #define CEPH_PG_LAYOUT_HYBRID 3 #define CEPH_PG_MAX_SIZE 32 /* max # osds in a single pg */ /* * placement group. * we encode this into one __le64. */ struct ceph_pg_v1 { __le16 preferred; /* preferred primary osd */ __le16 ps; /* placement seed */ __le32 pool; /* object pool */ } __attribute__ ((packed)); /* * pg_pool is a set of pgs storing a pool of objects * * pg_num -- base number of pseudorandomly placed pgs * * pgp_num -- effective number when calculating pg placement. this * is used for pg_num increases. new pgs result in data being "split" * into new pgs. for this to proceed smoothly, new pgs are intiially * colocated with their parents; that is, pgp_num doesn't increase * until the new pgs have successfully split. only _then_ are the new * pgs placed independently. * * lpg_num -- localized pg count (per device). replicas are randomly * selected. * * lpgp_num -- as above. */ #define CEPH_NOPOOL ((__u64) (-1)) /* pool id not defined */ #define CEPH_POOL_TYPE_REP 1 #define CEPH_POOL_TYPE_RAID4 2 /* never implemented */ #define CEPH_POOL_TYPE_EC 3 /* * stable_mod func is used to control number of placement groups. * similar to straight-up modulo, but produces a stable mapping as b * increases over time. b is the number of bins, and bmask is the * containing power of 2 minus 1. * * b <= bmask and bmask=(2**n)-1 * e.g., b=12 -> bmask=15, b=123 -> bmask=127 */ static inline int ceph_stable_mod(int x, int b, int bmask) { if ((x & bmask) < b) return x & bmask; else return x & (bmask >> 1); } /* * object layout - how a given object should be stored. */ struct ceph_object_layout { struct ceph_pg_v1 ol_pgid; /* raw pg, with _full_ ps precision. */ __le32 ol_stripe_unit; /* for per-object parity, if any */ } __attribute__ ((packed)); /* * compound epoch+version, used by storage layer to serialize mutations */ struct ceph_eversion { __le64 version; __le32 epoch; } __attribute__ ((packed)); /* * osd map bits */ /* status bits */ #define CEPH_OSD_EXISTS (1<<0) #define CEPH_OSD_UP (1<<1) #define CEPH_OSD_AUTOOUT (1<<2) /* osd was automatically marked out */ #define CEPH_OSD_NEW (1<<3) /* osd is new, never marked in */ extern const char *ceph_osd_state_name(int s); /* osd weights. fixed point value: 0x10000 == 1.0 ("in"), 0 == "out" */ #define CEPH_OSD_IN 0x10000 #define CEPH_OSD_OUT 0 /* osd primary-affinity. fixed point value: 0x10000 == baseline */ #define CEPH_OSD_MAX_PRIMARY_AFFINITY 0x10000 #define CEPH_OSD_DEFAULT_PRIMARY_AFFINITY 0x10000 /* * osd map flag bits */ #define CEPH_OSDMAP_NEARFULL (1<<0) /* sync writes (near ENOSPC), not set since ~luminous */ #define CEPH_OSDMAP_FULL (1<<1) /* no data writes (ENOSPC), not set since ~luminous */ #define CEPH_OSDMAP_PAUSERD (1<<2) /* pause all reads */ #define CEPH_OSDMAP_PAUSEWR (1<<3) /* pause all writes */ #define CEPH_OSDMAP_PAUSEREC (1<<4) /* pause recovery */ #define CEPH_OSDMAP_NOUP (1<<5) /* block osd boot */ #define CEPH_OSDMAP_NODOWN (1<<6) /* block osd mark-down/failure */ #define CEPH_OSDMAP_NOOUT (1<<7) /* block osd auto mark-out */ #define CEPH_OSDMAP_NOIN (1<<8) /* block osd auto mark-in */ #define CEPH_OSDMAP_NOBACKFILL (1<<9) /* block osd backfill */ #define CEPH_OSDMAP_NORECOVER (1<<10) /* block osd recovery and backfill */ #define CEPH_OSDMAP_NOSCRUB (1<<11) /* block periodic scrub */ #define CEPH_OSDMAP_NODEEP_SCRUB (1<<12) /* block periodic deep-scrub */ #define CEPH_OSDMAP_NOTIERAGENT (1<<13) /* disable tiering agent */ #define CEPH_OSDMAP_NOREBALANCE (1<<14) /* block osd backfill unless pg is degraded */ #define CEPH_OSDMAP_SORTBITWISE (1<<15) /* use bitwise hobject_t sort */ #define CEPH_OSDMAP_REQUIRE_JEWEL (1<<16) /* require jewel for booting osds */ #define CEPH_OSDMAP_REQUIRE_KRAKEN (1<<17) /* require kraken for booting osds */ #define CEPH_OSDMAP_REQUIRE_LUMINOUS (1<<18) /* require l for booting osds */ #define CEPH_OSDMAP_RECOVERY_DELETES (1<<19) /* deletes performed during recovery instead of peering */ /* * The error code to return when an OSD can't handle a write * because it is too large. */ #define OSD_WRITETOOBIG EMSGSIZE /* * osd ops * * WARNING: do not use these op codes directly. Use the helpers * defined below instead. In certain cases, op code behavior was * redefined, resulting in special-cases in the helpers. */ #define CEPH_OSD_OP_MODE 0xf000 #define CEPH_OSD_OP_MODE_RD 0x1000 #define CEPH_OSD_OP_MODE_WR 0x2000 #define CEPH_OSD_OP_MODE_RMW 0x3000 #define CEPH_OSD_OP_MODE_SUB 0x4000 #define CEPH_OSD_OP_MODE_CACHE 0x8000 #define CEPH_OSD_OP_TYPE 0x0f00 #define CEPH_OSD_OP_TYPE_LOCK 0x0100 #define CEPH_OSD_OP_TYPE_DATA 0x0200 #define CEPH_OSD_OP_TYPE_ATTR 0x0300 #define CEPH_OSD_OP_TYPE_EXEC 0x0400 #define CEPH_OSD_OP_TYPE_PG 0x0500 #define CEPH_OSD_OP_TYPE_MULTI 0x0600 /* multiobject */ #define __CEPH_OSD_OP1(mode, nr) \ (CEPH_OSD_OP_MODE_##mode | (nr)) #define __CEPH_OSD_OP(mode, type, nr) \ (CEPH_OSD_OP_MODE_##mode | CEPH_OSD_OP_TYPE_##type | (nr)) #define __CEPH_FORALL_OSD_OPS(f) \ /** data **/ \ /* read */ \ f(READ, __CEPH_OSD_OP(RD, DATA, 1), "read") \ f(STAT, __CEPH_OSD_OP(RD, DATA, 2), "stat") \ f(MAPEXT, __CEPH_OSD_OP(RD, DATA, 3), "mapext") \ \ /* fancy read */ \ f(MASKTRUNC, __CEPH_OSD_OP(RD, DATA, 4), "masktrunc") \ f(SPARSE_READ, __CEPH_OSD_OP(RD, DATA, 5), "sparse-read") \ \ f(NOTIFY, __CEPH_OSD_OP(RD, DATA, 6), "notify") \ f(NOTIFY_ACK, __CEPH_OSD_OP(RD, DATA, 7), "notify-ack") \ \ /* versioning */ \ f(ASSERT_VER, __CEPH_OSD_OP(RD, DATA, 8), "assert-version") \ \ f(LIST_WATCHERS, __CEPH_OSD_OP(RD, DATA, 9), "list-watchers") \ \ f(LIST_SNAPS, __CEPH_OSD_OP(RD, DATA, 10), "list-snaps") \ \ /* sync */ \ f(SYNC_READ, __CEPH_OSD_OP(RD, DATA, 11), "sync_read") \ \ /* write */ \ f(WRITE, __CEPH_OSD_OP(WR, DATA, 1), "write") \ f(WRITEFULL, __CEPH_OSD_OP(WR, DATA, 2), "writefull") \ f(TRUNCATE, __CEPH_OSD_OP(WR, DATA, 3), "truncate") \ f(ZERO, __CEPH_OSD_OP(WR, DATA, 4), "zero") \ f(DELETE, __CEPH_OSD_OP(WR, DATA, 5), "delete") \ \ /* fancy write */ \ f(APPEND, __CEPH_OSD_OP(WR, DATA, 6), "append") \ f(SETTRUNC, __CEPH_OSD_OP(WR, DATA, 8), "settrunc") \ f(TRIMTRUNC, __CEPH_OSD_OP(WR, DATA, 9), "trimtrunc") \ \ f(TMAPUP, __CEPH_OSD_OP(RMW, DATA, 10), "tmapup") \ f(TMAPPUT, __CEPH_OSD_OP(WR, DATA, 11), "tmapput") \ f(TMAPGET, __CEPH_OSD_OP(RD, DATA, 12), "tmapget") \ \ f(CREATE, __CEPH_OSD_OP(WR, DATA, 13), "create") \ f(ROLLBACK, __CEPH_OSD_OP(WR, DATA, 14), "rollback") \ \ f(WATCH, __CEPH_OSD_OP(WR, DATA, 15), "watch") \ \ /* omap */ \ f(OMAPGETKEYS, __CEPH_OSD_OP(RD, DATA, 17), "omap-get-keys") \ f(OMAPGETVALS, __CEPH_OSD_OP(RD, DATA, 18), "omap-get-vals") \ f(OMAPGETHEADER, __CEPH_OSD_OP(RD, DATA, 19), "omap-get-header") \ f(OMAPGETVALSBYKEYS, __CEPH_OSD_OP(RD, DATA, 20), "omap-get-vals-by-keys") \ f(OMAPSETVALS, __CEPH_OSD_OP(WR, DATA, 21), "omap-set-vals") \ f(OMAPSETHEADER, __CEPH_OSD_OP(WR, DATA, 22), "omap-set-header") \ f(OMAPCLEAR, __CEPH_OSD_OP(WR, DATA, 23), "omap-clear") \ f(OMAPRMKEYS, __CEPH_OSD_OP(WR, DATA, 24), "omap-rm-keys") \ f(OMAP_CMP, __CEPH_OSD_OP(RD, DATA, 25), "omap-cmp") \ \ /* tiering */ \ f(COPY_FROM, __CEPH_OSD_OP(WR, DATA, 26), "copy-from") \ f(COPY_FROM2, __CEPH_OSD_OP(WR, DATA, 45), "copy-from2") \ f(COPY_GET_CLASSIC, __CEPH_OSD_OP(RD, DATA, 27), "copy-get-classic") \ f(UNDIRTY, __CEPH_OSD_OP(WR, DATA, 28), "undirty") \ f(ISDIRTY, __CEPH_OSD_OP(RD, DATA, 29), "isdirty") \ f(COPY_GET, __CEPH_OSD_OP(RD, DATA, 30), "copy-get") \ f(CACHE_FLUSH, __CEPH_OSD_OP(CACHE, DATA, 31), "cache-flush") \ f(CACHE_EVICT, __CEPH_OSD_OP(CACHE, DATA, 32), "cache-evict") \ f(CACHE_TRY_FLUSH, __CEPH_OSD_OP(CACHE, DATA, 33), "cache-try-flush") \ \ /* convert tmap to omap */ \ f(TMAP2OMAP, __CEPH_OSD_OP(RMW, DATA, 34), "tmap2omap") \ \ /* hints */ \ f(SETALLOCHINT, __CEPH_OSD_OP(WR, DATA, 35), "set-alloc-hint") \ \ /** multi **/ \ f(CLONERANGE, __CEPH_OSD_OP(WR, MULTI, 1), "clonerange") \ f(ASSERT_SRC_VERSION, __CEPH_OSD_OP(RD, MULTI, 2), "assert-src-version") \ f(SRC_CMPXATTR, __CEPH_OSD_OP(RD, MULTI, 3), "src-cmpxattr") \ \ /** attrs **/ \ /* read */ \ f(GETXATTR, __CEPH_OSD_OP(RD, ATTR, 1), "getxattr") \ f(GETXATTRS, __CEPH_OSD_OP(RD, ATTR, 2), "getxattrs") \ f(CMPXATTR, __CEPH_OSD_OP(RD, ATTR, 3), "cmpxattr") \ \ /* write */ \ f(SETXATTR, __CEPH_OSD_OP(WR, ATTR, 1), "setxattr") \ f(SETXATTRS, __CEPH_OSD_OP(WR, ATTR, 2), "setxattrs") \ f(RESETXATTRS, __CEPH_OSD_OP(WR, ATTR, 3), "resetxattrs") \ f(RMXATTR, __CEPH_OSD_OP(WR, ATTR, 4), "rmxattr") \ \ /** subop **/ \ f(PULL, __CEPH_OSD_OP1(SUB, 1), "pull") \ f(PUSH, __CEPH_OSD_OP1(SUB, 2), "push") \ f(BALANCEREADS, __CEPH_OSD_OP1(SUB, 3), "balance-reads") \ f(UNBALANCEREADS, __CEPH_OSD_OP1(SUB, 4), "unbalance-reads") \ f(SCRUB, __CEPH_OSD_OP1(SUB, 5), "scrub") \ f(SCRUB_RESERVE, __CEPH_OSD_OP1(SUB, 6), "scrub-reserve") \ f(SCRUB_UNRESERVE, __CEPH_OSD_OP1(SUB, 7), "scrub-unreserve") \ f(SCRUB_STOP, __CEPH_OSD_OP1(SUB, 8), "scrub-stop") \ f(SCRUB_MAP, __CEPH_OSD_OP1(SUB, 9), "scrub-map") \ \ /** lock **/ \ f(WRLOCK, __CEPH_OSD_OP(WR, LOCK, 1), "wrlock") \ f(WRUNLOCK, __CEPH_OSD_OP(WR, LOCK, 2), "wrunlock") \ f(RDLOCK, __CEPH_OSD_OP(WR, LOCK, 3), "rdlock") \ f(RDUNLOCK, __CEPH_OSD_OP(WR, LOCK, 4), "rdunlock") \ f(UPLOCK, __CEPH_OSD_OP(WR, LOCK, 5), "uplock") \ f(DNLOCK, __CEPH_OSD_OP(WR, LOCK, 6), "dnlock") \ \ /** exec **/ \ /* note: the RD bit here is wrong; see special-case below in helper */ \ f(CALL, __CEPH_OSD_OP(RD, EXEC, 1), "call") \ \ /** pg **/ \ f(PGLS, __CEPH_OSD_OP(RD, PG, 1), "pgls") \ f(PGLS_FILTER, __CEPH_OSD_OP(RD, PG, 2), "pgls-filter") \ f(PG_HITSET_LS, __CEPH_OSD_OP(RD, PG, 3), "pg-hitset-ls") \ f(PG_HITSET_GET, __CEPH_OSD_OP(RD, PG, 4), "pg-hitset-get") enum { #define GENERATE_ENUM_ENTRY(op, opcode, str) CEPH_OSD_OP_##op = (opcode), __CEPH_FORALL_OSD_OPS(GENERATE_ENUM_ENTRY) #undef GENERATE_ENUM_ENTRY }; static inline int ceph_osd_op_type_lock(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_LOCK; } static inline int ceph_osd_op_type_data(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_DATA; } static inline int ceph_osd_op_type_attr(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_ATTR; } static inline int ceph_osd_op_type_exec(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_EXEC; } static inline int ceph_osd_op_type_pg(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_PG; } static inline int ceph_osd_op_type_multi(int op) { return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_MULTI; } static inline int ceph_osd_op_mode_subop(int op) { return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_SUB; } static inline int ceph_osd_op_mode_read(int op) { return (op & CEPH_OSD_OP_MODE_RD) && op != CEPH_OSD_OP_CALL; } static inline int ceph_osd_op_mode_modify(int op) { return op & CEPH_OSD_OP_MODE_WR; } /* * note that the following tmap stuff is also defined in the ceph librados.h * any modification here needs to be updated there */ #define CEPH_OSD_TMAP_HDR 'h' #define CEPH_OSD_TMAP_SET 's' #define CEPH_OSD_TMAP_CREATE 'c' /* create key */ #define CEPH_OSD_TMAP_RM 'r' #define CEPH_OSD_TMAP_RMSLOPPY 'R' extern const char *ceph_osd_op_name(int op); /* * osd op flags * * An op may be READ, WRITE, or READ|WRITE. */ enum { CEPH_OSD_FLAG_ACK = 0x0001, /* want (or is) "ack" ack */ CEPH_OSD_FLAG_ONNVRAM = 0x0002, /* want (or is) "onnvram" ack */ CEPH_OSD_FLAG_ONDISK = 0x0004, /* want (or is) "ondisk" ack */ CEPH_OSD_FLAG_RETRY = 0x0008, /* resend attempt */ CEPH_OSD_FLAG_READ = 0x0010, /* op may read */ CEPH_OSD_FLAG_WRITE = 0x0020, /* op may write */ CEPH_OSD_FLAG_ORDERSNAP = 0x0040, /* EOLDSNAP if snapc is out of order */ CEPH_OSD_FLAG_PEERSTAT_OLD = 0x0080, /* DEPRECATED msg includes osd_peer_stat */ CEPH_OSD_FLAG_BALANCE_READS = 0x0100, CEPH_OSD_FLAG_PARALLELEXEC = 0x0200, /* execute op in parallel */ CEPH_OSD_FLAG_PGOP = 0x0400, /* pg op, no object */ CEPH_OSD_FLAG_EXEC = 0x0800, /* op may exec */ CEPH_OSD_FLAG_EXEC_PUBLIC = 0x1000, /* DEPRECATED op may exec (public) */ CEPH_OSD_FLAG_LOCALIZE_READS = 0x2000, /* read from nearby replica, if any */ CEPH_OSD_FLAG_RWORDERED = 0x4000, /* order wrt concurrent reads */ CEPH_OSD_FLAG_IGNORE_CACHE = 0x8000, /* ignore cache logic */ CEPH_OSD_FLAG_SKIPRWLOCKS = 0x10000, /* skip rw locks */ CEPH_OSD_FLAG_IGNORE_OVERLAY = 0x20000, /* ignore pool overlay */ CEPH_OSD_FLAG_FLUSH = 0x40000, /* this is part of flush */ CEPH_OSD_FLAG_MAP_SNAP_CLONE = 0x80000, /* map snap direct to clone id */ CEPH_OSD_FLAG_ENFORCE_SNAPC = 0x100000, /* use snapc provided even if pool uses pool snaps */ CEPH_OSD_FLAG_REDIRECTED = 0x200000, /* op has been redirected */ CEPH_OSD_FLAG_KNOWN_REDIR = 0x400000, /* redirect bit is authoritative */ CEPH_OSD_FLAG_FULL_TRY = 0x800000, /* try op despite full flag */ CEPH_OSD_FLAG_FULL_FORCE = 0x1000000, /* force op despite full flag */ }; enum { CEPH_OSD_OP_FLAG_EXCL = 1, /* EXCL object create */ CEPH_OSD_OP_FLAG_FAILOK = 2, /* continue despite failure */ CEPH_OSD_OP_FLAG_FADVISE_RANDOM = 0x4, /* the op is random */ CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL = 0x8, /* the op is sequential */ CEPH_OSD_OP_FLAG_FADVISE_WILLNEED = 0x10,/* data will be accessed in the near future */ CEPH_OSD_OP_FLAG_FADVISE_DONTNEED = 0x20,/* data will not be accessed in the near future */ CEPH_OSD_OP_FLAG_FADVISE_NOCACHE = 0x40,/* data will be accessed only once by this client */ }; #define EOLDSNAPC ERESTART /* ORDERSNAP flag set; writer has old snapc*/ #define EBLOCKLISTED ESHUTDOWN /* blocklisted */ /* xattr comparison */ enum { CEPH_OSD_CMPXATTR_OP_NOP = 0, CEPH_OSD_CMPXATTR_OP_EQ = 1, CEPH_OSD_CMPXATTR_OP_NE = 2, CEPH_OSD_CMPXATTR_OP_GT = 3, CEPH_OSD_CMPXATTR_OP_GTE = 4, CEPH_OSD_CMPXATTR_OP_LT = 5, CEPH_OSD_CMPXATTR_OP_LTE = 6 }; enum { CEPH_OSD_CMPXATTR_MODE_STRING = 1, CEPH_OSD_CMPXATTR_MODE_U64 = 2 }; enum { CEPH_OSD_COPY_FROM_FLAG_FLUSH = 1, /* part of a flush operation */ CEPH_OSD_COPY_FROM_FLAG_IGNORE_OVERLAY = 2, /* ignore pool overlay */ CEPH_OSD_COPY_FROM_FLAG_IGNORE_CACHE = 4, /* ignore osd cache logic */ CEPH_OSD_COPY_FROM_FLAG_MAP_SNAP_CLONE = 8, /* map snap direct to * cloneid */ CEPH_OSD_COPY_FROM_FLAG_RWORDERED = 16, /* order with write */ CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ = 32, /* send truncate_{seq,size} */ }; enum { CEPH_OSD_WATCH_OP_UNWATCH = 0, CEPH_OSD_WATCH_OP_LEGACY_WATCH = 1, /* note: use only ODD ids to prevent pre-giant code from interpreting the op as UNWATCH */ CEPH_OSD_WATCH_OP_WATCH = 3, CEPH_OSD_WATCH_OP_RECONNECT = 5, CEPH_OSD_WATCH_OP_PING = 7, }; const char *ceph_osd_watch_op_name(int o); enum { CEPH_OSD_ALLOC_HINT_FLAG_SEQUENTIAL_WRITE = 1, CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_WRITE = 2, CEPH_OSD_ALLOC_HINT_FLAG_SEQUENTIAL_READ = 4, CEPH_OSD_ALLOC_HINT_FLAG_RANDOM_READ = 8, CEPH_OSD_ALLOC_HINT_FLAG_APPEND_ONLY = 16, CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE = 32, CEPH_OSD_ALLOC_HINT_FLAG_SHORTLIVED = 64, CEPH_OSD_ALLOC_HINT_FLAG_LONGLIVED = 128, CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE = 256, CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE = 512, }; enum { CEPH_OSD_BACKOFF_OP_BLOCK = 1, CEPH_OSD_BACKOFF_OP_ACK_BLOCK = 2, CEPH_OSD_BACKOFF_OP_UNBLOCK = 3, }; /* * an individual object operation. each may be accompanied by some data * payload */ struct ceph_osd_op { __le16 op; /* CEPH_OSD_OP_* */ __le32 flags; /* CEPH_OSD_OP_FLAG_* */ union { struct { __le64 offset, length; __le64 truncate_size; __le32 truncate_seq; } __attribute__ ((packed)) extent; struct { __le32 name_len;