fs/ceph/rados.h

   1 #ifndef __RADOS_H
   2 #define __RADOS_H
   3
   4 /*
   5  * Data types for the Ceph distributed object storage layer RADOS
   6  * (Reliable Autonomic Distributed Object Store).
   7  */
   8
   9 #include "msgr.h"
  10
  11 /*
  12  * osdmap encoding versions
  13  */
  14 #define CEPH_OSDMAP_INC_VERSION     5
  15 #define CEPH_OSDMAP_INC_VERSION_EXT 5
  16 #define CEPH_OSDMAP_VERSION         5
  17 #define CEPH_OSDMAP_VERSION_EXT     5
  18
  19 /*
  20  * fs id
  21  */
  22 struct ceph_fsid {
  23         unsigned char fsid[16];
  24 };
  25
  26 static inline int ceph_fsid_compare(const struct ceph_fsid *a,
  27                                     const struct ceph_fsid *b)
  28 {
  29         return memcmp(a, b, sizeof(*a));
  30 }
  31
  32 /*
  33  * ino, object, etc.
  34  */
  35 typedef __le64 ceph_snapid_t;
  36 #define CEPH_SNAPDIR ((__u64)(-1))  /* reserved for hidden .snap dir */
  37 #define CEPH_NOSNAP  ((__u64)(-2))  /* "head", "live" revision */
  38 #define CEPH_MAXSNAP ((__u64)(-3))  /* largest valid snapid */
  39
  40 struct ceph_timespec {
  41         __le32 tv_sec;
  42         __le32 tv_nsec;
  43 } __attribute__ ((packed));
  44
  45
  46 /*
  47  * object layout - how objects are mapped into PGs
  48  */
  49 #define CEPH_OBJECT_LAYOUT_HASH     1
  50 #define CEPH_OBJECT_LAYOUT_LINEAR   2
  51 #define CEPH_OBJECT_LAYOUT_HASHINO  3
  52
  53 /*
  54  * pg layout -- how PGs are mapped onto (sets of) OSDs
  55  */
  56 #define CEPH_PG_LAYOUT_CRUSH  0
  57 #define CEPH_PG_LAYOUT_HASH   1
  58 #define CEPH_PG_LAYOUT_LINEAR 2
  59 #define CEPH_PG_LAYOUT_HYBRID 3
  60
  61 #define CEPH_PG_MAX_SIZE      16  /* max # osds in a single pg */
  62
  63 /*
  64  * placement group.
  65  * we encode this into one __le64.
  66  */
  67 struct ceph_pg {
  68         __le16 preferred; /* preferred primary osd */
  69         __le16 ps;        /* placement seed */
  70         __le32 pool;      /* object pool */
  71 } __attribute__ ((packed));
  72
  73 /*
  74  * pg_pool is a set of pgs storing a pool of objects
  75  *
  76  *  pg_num -- base number of pseudorandomly placed pgs
  77  *
  78  *  pgp_num -- effective number when calculating pg placement.  this
  79  * is used for pg_num increases.  new pgs result in data being "split"
  80  * into new pgs.  for this to proceed smoothly, new pgs are intiially
  81  * colocated with their parents; that is, pgp_num doesn't increase
  82  * until the new pgs have successfully split.  only _then_ are the new
  83  * pgs placed independently.
  84  *
  85  *  lpg_num -- localized pg count (per device).  replicas are randomly
  86  * selected.
  87  *
  88  *  lpgp_num -- as above.
  89  */
  90 #define CEPH_PG_TYPE_REP     1
  91 #define CEPH_PG_TYPE_RAID4   2
  92 #define CEPH_PG_POOL_VERSION 2
  93 struct ceph_pg_pool {
  94         __u8 type;                /* CEPH_PG_TYPE_* */
  95         __u8 size;                /* number of osds in each pg */
  96         __u8 crush_ruleset;       /* crush placement rule */
  97         __u8 object_hash;         /* hash mapping object name to ps */
  98         __le32 pg_num, pgp_num;   /* number of pg's */
  99         __le32 lpg_num, lpgp_num; /* number of localized pg's */
 100         __le32 last_change;       /* most recent epoch changed */
 101         __le64 snap_seq;          /* seq for per-pool snapshot */
 102         __le32 snap_epoch;        /* epoch of last snap */
 103         __le32 num_snaps;
 104         __le32 num_removed_snap_intervals; /* if non-empty, NO per-pool snaps */
 105         __le64 auid;               /* who owns the pg */
 106 } __attribute__ ((packed));
 107
 108 /*
 109  * stable_mod func is used to control number of placement groups.
 110  * similar to straight-up modulo, but produces a stable mapping as b
 111  * increases over time.  b is the number of bins, and bmask is the
 112  * containing power of 2 minus 1.
 113  *
 114  * b <= bmask and bmask=(2**n)-1
 115  * e.g., b=12 -> bmask=15, b=123 -> bmask=127
 116  */
 117 static inline int ceph_stable_mod(int x, int b, int bmask)
 118 {
 119         if ((x & bmask) < b)
 120                 return x & bmask;
 121         else
 122                 return x & (bmask >> 1);
 123 }
 124
 125 /*
 126  * object layout - how a given object should be stored.
 127  */
 128 struct ceph_object_layout {
 129         struct ceph_pg ol_pgid;   /* raw pg, with _full_ ps precision. */
 130         __le32 ol_stripe_unit;    /* for per-object parity, if any */
 131 } __attribute__ ((packed));
 132
 133 /*
 134  * compound epoch+version, used by storage layer to serialize mutations
 135  */
 136 struct ceph_eversion {
 137         __le32 epoch;
 138         __le64 version;
 139 } __attribute__ ((packed));
 140
 141 /*
 142  * osd map bits
 143  */
 144
 145 /* status bits */
 146 #define CEPH_OSD_EXISTS 1
 147 #define CEPH_OSD_UP     2
 148
 149 /* osd weights.  fixed point value: 0x10000 == 1.0 ("in"), 0 == "out" */
 150 #define CEPH_OSD_IN  0x10000
 151 #define CEPH_OSD_OUT 0
 152
 153
 154 /*
 155  * osd map flag bits
 156  */
 157 #define CEPH_OSDMAP_NEARFULL (1<<0)  /* sync writes (near ENOSPC) */
 158 #define CEPH_OSDMAP_FULL     (1<<1)  /* no data writes (ENOSPC) */
 159 #define CEPH_OSDMAP_PAUSERD  (1<<2)  /* pause all reads */
 160 #define CEPH_OSDMAP_PAUSEWR  (1<<3)  /* pause all writes */
 161 #define CEPH_OSDMAP_PAUSEREC (1<<4)  /* pause recovery */
 162
 163 /*
 164  * osd ops
 165  */
 166 #define CEPH_OSD_OP_MODE       0xf000
 167 #define CEPH_OSD_OP_MODE_RD    0x1000
 168 #define CEPH_OSD_OP_MODE_WR    0x2000
 169 #define CEPH_OSD_OP_MODE_RMW   0x3000
 170 #define CEPH_OSD_OP_MODE_SUB   0x4000
 171
 172 #define CEPH_OSD_OP_TYPE       0x0f00
 173 #define CEPH_OSD_OP_TYPE_LOCK  0x0100
 174 #define CEPH_OSD_OP_TYPE_DATA  0x0200
 175 #define CEPH_OSD_OP_TYPE_ATTR  0x0300
 176 #define CEPH_OSD_OP_TYPE_EXEC  0x0400
 177 #define CEPH_OSD_OP_TYPE_PG    0x0500
 178
 179 enum {
 180         /** data **/
 181         /* read */
 182         CEPH_OSD_OP_READ      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 1,
 183         CEPH_OSD_OP_STAT      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 2,
 184
 185         /* fancy read */
 186         CEPH_OSD_OP_MASKTRUNC = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 4,
 187
 188         /* write */
 189         CEPH_OSD_OP_WRITE     = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 1,
 190         CEPH_OSD_OP_WRITEFULL = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 2,
 191         CEPH_OSD_OP_TRUNCATE  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 3,
 192         CEPH_OSD_OP_ZERO      = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 4,
 193         CEPH_OSD_OP_DELETE    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 5,
 194
 195         /* fancy write */
 196         CEPH_OSD_OP_APPEND    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 6,
 197         CEPH_OSD_OP_STARTSYNC = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 7,
 198         CEPH_OSD_OP_SETTRUNC  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 8,
 199         CEPH_OSD_OP_TRIMTRUNC = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 9,
 200
 201         CEPH_OSD_OP_TMAPUP  = CEPH_OSD_OP_MODE_RMW | CEPH_OSD_OP_TYPE_DATA | 10,
 202         CEPH_OSD_OP_TMAPPUT = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 11,
 203         CEPH_OSD_OP_TMAPGET = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 12,
 204
 205         CEPH_OSD_OP_CREATE  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 13,
 206
 207         /** attrs **/
 208         /* read */
 209         CEPH_OSD_OP_GETXATTR  = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 1,
 210         CEPH_OSD_OP_GETXATTRS = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 2,
 211         CEPH_OSD_OP_CMPXATTR  = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 3,
 212
 213         /* write */
 214         CEPH_OSD_OP_SETXATTR  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 1,
 215         CEPH_OSD_OP_SETXATTRS = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 2,
 216         CEPH_OSD_OP_RESETXATTRS = CEPH_OSD_OP_MODE_WR|CEPH_OSD_OP_TYPE_ATTR | 3,
 217         CEPH_OSD_OP_RMXATTR   = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 4,
 218
 219         /** subop **/
 220         CEPH_OSD_OP_PULL           = CEPH_OSD_OP_MODE_SUB | 1,
 221         CEPH_OSD_OP_PUSH           = CEPH_OSD_OP_MODE_SUB | 2,
 222         CEPH_OSD_OP_BALANCEREADS   = CEPH_OSD_OP_MODE_SUB | 3,
 223         CEPH_OSD_OP_UNBALANCEREADS = CEPH_OSD_OP_MODE_SUB | 4,
 224         CEPH_OSD_OP_SCRUB          = CEPH_OSD_OP_MODE_SUB | 5,
 225
 226         /** lock **/
 227         CEPH_OSD_OP_WRLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 1,
 228         CEPH_OSD_OP_WRUNLOCK  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 2,
 229         CEPH_OSD_OP_RDLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 3,
 230         CEPH_OSD_OP_RDUNLOCK  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 4,
 231         CEPH_OSD_OP_UPLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 5,
 232         CEPH_OSD_OP_DNLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 6,
 233
 234         /** exec **/
 235         CEPH_OSD_OP_CALL    = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_EXEC | 1,
 236
 237         /** pg **/
 238         CEPH_OSD_OP_PGLS      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_PG | 1,
 239 };
 240
 241 static inline int ceph_osd_op_type_lock(int op)
 242 {
 243         return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_LOCK;
 244 }
 245 static inline int ceph_osd_op_type_data(int op)
 246 {
 247         return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_DATA;
 248 }
 249 static inline int ceph_osd_op_type_attr(int op)
 250 {
 251         return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_ATTR;
 252 }
 253 static inline int ceph_osd_op_type_exec(int op)
 254 {
 255         return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_EXEC;
 256 }
 257 static inline int ceph_osd_op_type_pg(int op)
 258 {
 259         return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_PG;
 260 }
 261
 262 static inline int ceph_osd_op_mode_subop(int op)
 263 {
 264         return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_SUB;
 265 }
 266 static inline int ceph_osd_op_mode_read(int op)
 267 {
 268         return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_RD;
 269 }
 270 static inline int ceph_osd_op_mode_modify(int op)
 271 {
 272         return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_WR;
 273 }
 274
 275 #define CEPH_OSD_TMAP_HDR 'h'
 276 #define CEPH_OSD_TMAP_SET 's'
 277 #define CEPH_OSD_TMAP_RM  'r'
 278
 279 extern const char *ceph_osd_op_name(int op);
 280
 281
 282 /*
 283  * osd op flags
 284  *
 285  * An op may be READ, WRITE, or READ|WRITE.
 286  */
 287 enum {
 288         CEPH_OSD_FLAG_ACK = 1,          /* want (or is) "ack" ack */
 289         CEPH_OSD_FLAG_ONNVRAM = 2,      /* want (or is) "onnvram" ack */
 290         CEPH_OSD_FLAG_ONDISK = 4,       /* want (or is) "ondisk" ack */
 291         CEPH_OSD_FLAG_RETRY = 8,        /* resend attempt */
 292         CEPH_OSD_FLAG_READ = 16,        /* op may read */
 293         CEPH_OSD_FLAG_WRITE = 32,       /* op may write */
 294         CEPH_OSD_FLAG_ORDERSNAP = 64,   /* EOLDSNAP if snapc is out of order */
 295         CEPH_OSD_FLAG_PEERSTAT = 128,   /* msg includes osd_peer_stat */
 296         CEPH_OSD_FLAG_BALANCE_READS = 256,
 297         CEPH_OSD_FLAG_PARALLELEXEC = 512, /* execute op in parallel */
 298         CEPH_OSD_FLAG_PGOP = 1024,      /* pg op, no object */
 299         CEPH_OSD_FLAG_EXEC = 2048,      /* op may exec */
 300 };
 301
 302 enum {
 303         CEPH_OSD_OP_FLAG_EXCL = 1,      /* EXCL object create */
 304 };
 305
 306 #define EOLDSNAPC    ERESTART  /* ORDERSNAP flag set; writer has old snapc*/
 307 #define EBLACKLISTED ESHUTDOWN /* blacklisted */
 308
 309 /* xattr comparison */
 310 enum {
 311         CEPH_OSD_CMPXATTR_OP_NOP = 0,
 312         CEPH_OSD_CMPXATTR_OP_EQ  = 1,
 313         CEPH_OSD_CMPXATTR_OP_NE  = 2,
 314         CEPH_OSD_CMPXATTR_OP_GT  = 3,
 315         CEPH_OSD_CMPXATTR_OP_GTE = 4,
 316         CEPH_OSD_CMPXATTR_OP_LT  = 5,
 317         CEPH_OSD_CMPXATTR_OP_LTE = 6
 318 };
 319
 320 enum {
 321         CEPH_OSD_CMPXATTR_MODE_STRING = 1,
 322         CEPH_OSD_CMPXATTR_MODE_U64    = 2
 323 };
 324
 325 /*
 326  * an individual object operation.  each may be accompanied by some data
 327  * payload
 328  */
 329 struct ceph_osd_op {
 330         __le16 op;           /* CEPH_OSD_OP_* */
 331         __le32 flags;        /* CEPH_OSD_FLAG_* */
 332         union {
 333                 struct {
 334                         __le64 offset, length;
 335                         __le64 truncate_size;
 336                         __le32 truncate_seq;
 337                 } __attribute__ ((packed)) extent;
 338                 struct {
 339                         __le32 name_len;
 340                         __le32 value_len;
 341                         __u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
 342                         __u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
 343                 } __attribute__ ((packed)) xattr;
 344                 struct {
 345                         __u8 class_len;
 346                         __u8 method_len;
 347                         __u8 argc;
 348                         __le32 indata_len;
 349                 } __attribute__ ((packed)) cls;
 350                 struct {
 351                         __le64 cookie, count;
 352                 } __attribute__ ((packed)) pgls;
 353         };
 354         __le32 payload_len;
 355 } __attribute__ ((packed));
 356
 357 /*
 358  * osd request message header.  each request may include multiple
 359  * ceph_osd_op object operations.
 360  */
 361 struct ceph_osd_request_head {
 362         __le32 client_inc;                 /* client incarnation */
 363         struct ceph_object_layout layout;  /* pgid */
 364         __le32 osdmap_epoch;               /* client's osdmap epoch */
 365
 366         __le32 flags;
 367
 368         struct ceph_timespec mtime;        /* for mutations only */
 369         struct ceph_eversion reassert_version; /* if we are replaying op */
 370
 371         __le32 object_len;     /* length of object name */
 372
 373         __le64 snapid;         /* snapid to read */
 374         __le64 snap_seq;       /* writer's snap context */
 375         __le32 num_snaps;
 376
 377         __le16 num_ops;
 378         struct ceph_osd_op ops[];  /* followed by ops[], obj, ticket, snaps */
 379 } __attribute__ ((packed));
 380
 381 struct ceph_osd_reply_head {
 382         __le32 client_inc;                /* client incarnation */
 383         __le32 flags;
 384         struct ceph_object_layout layout;
 385         __le32 osdmap_epoch;
 386         struct ceph_eversion reassert_version; /* for replaying uncommitted */
 387
 388         __le32 result;                    /* result code */
 389
 390         __le32 object_len;                /* length of object name */
 391         __le32 num_ops;
 392         struct ceph_osd_op ops[0];  /* ops[], object */
 393 } __attribute__ ((packed));
 394
 395
 396 #endif