lustre/include/linux/lustre_dlm.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #ifndef _LUSTRE_DLM_H__
   6 #define _LUSTRE_DLM_H__
   7
   8 #ifdef __KERNEL__
   9
  10 #include <linux/proc_fs.h>
  11 #include <linux/lustre_lib.h>
  12 #include <linux/lustre_net.h>
  13 #include <linux/lustre_import.h>
  14
  15 struct obd_ops;
  16 struct obd_device;
  17
  18 #define OBD_LDLM_DEVICENAME  "ldlm"
  19
  20 typedef enum {
  21         ELDLM_OK = 0,
  22
  23         ELDLM_LOCK_CHANGED = 300,
  24         ELDLM_LOCK_ABORTED = 301,
  25
  26         ELDLM_NAMESPACE_EXISTS = 400,
  27         ELDLM_BAD_NAMESPACE    = 401
  28 } ldlm_error_t;
  29
  30 #define LDLM_NAMESPACE_SERVER 0
  31 #define LDLM_NAMESPACE_CLIENT 1
  32
  33 #define LDLM_FL_LOCK_CHANGED   (1 << 0)
  34 #define LDLM_FL_BLOCK_GRANTED  (1 << 1)
  35 #define LDLM_FL_BLOCK_CONV     (1 << 2)
  36 #define LDLM_FL_BLOCK_WAIT     (1 << 3)
  37 #define LDLM_FL_CBPENDING      (1 << 4)
  38 #define LDLM_FL_AST_SENT       (1 << 5)
  39 #define LDLM_FL_DESTROYED      (1 << 6)
  40 #define LDLM_FL_WAIT_NOREPROC  (1 << 7)
  41 #define LDLM_FL_CANCEL         (1 << 8)
  42
  43 #define LDLM_CB_BLOCKING    1
  44 #define LDLM_CB_CANCELING   2
  45
  46 #define L2B(c) (1 << c)
  47
  48 /* compatibility matrix */
  49 #define LCK_COMPAT_EX  L2B(LCK_NL)
  50 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  51 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  52 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  53 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  54 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  55
  56 static ldlm_mode_t lck_compat_array[] = {
  57         [LCK_EX] LCK_COMPAT_EX,
  58         [LCK_PW] LCK_COMPAT_PW,
  59         [LCK_PR] LCK_COMPAT_PR,
  60         [LCK_CW] LCK_COMPAT_CW,
  61         [LCK_CR] LCK_COMPAT_CR,
  62         [LCK_NL] LCK_COMPAT_NL
  63 };
  64
  65 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  66 {
  67        if (exist < LCK_EX || exist > LCK_NL)
  68               LBUG();
  69        if (new < LCK_EX || new > LCK_NL)
  70               LBUG();
  71
  72        return (lck_compat_array[exist] & L2B(new));
  73 }
  74
  75 /*
  76  *
  77  * cluster name spaces
  78  *
  79  */
  80
  81 #define DLM_OST_NAMESPACE 1
  82 #define DLM_MDS_NAMESPACE 2
  83
  84 /* XXX
  85    - do we just separate this by security domains and use a prefix for
  86      multiple namespaces in the same domain?
  87    -
  88 */
  89
  90 struct ldlm_namespace {
  91         char                  *ns_name;
  92         __u32                  ns_client; /* is this a client-side lock tree? */
  93         struct list_head      *ns_hash; /* hash table for ns */
  94         __u32                  ns_refcount; /* count of resources in the hash */
  95         struct list_head       ns_root_list; /* all root resources in ns */
  96         struct list_head       ns_list_chain; /* position in global NS list */
  97         struct proc_dir_entry *ns_proc_dir;
  98
  99         spinlock_t             ns_counter_lock;
 100         __u64                  ns_locks;
 101         __u64                  ns_resources;
 102 };
 103
 104 /*
 105  *
 106  * Resource hash table
 107  *
 108  */
 109
 110 #define RES_HASH_BITS 14
 111 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 112 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 113
 114 struct ldlm_lock;
 115
 116 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 117                                       struct ldlm_lock_desc *new, void *data,
 118                                       __u32 data_len, int flag);
 119
 120 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags);
 121
 122 struct ldlm_lock {
 123         __u64                 l_random;
 124         int                   l_refc;
 125         struct ldlm_resource *l_resource;
 126         struct ldlm_lock     *l_parent;
 127         struct list_head      l_children;
 128         struct list_head      l_childof;
 129         struct list_head      l_res_link; /*position in one of three res lists*/
 130         struct list_head      l_export_chain; /* per-export chain of locks */
 131         struct list_head      l_pending_chain; /* locks with callbacks pending*/
 132         unsigned long         l_callback_timeout;
 133
 134         ldlm_mode_t           l_req_mode;
 135         ldlm_mode_t           l_granted_mode;
 136
 137         ldlm_completion_callback    l_completion_ast;
 138         ldlm_blocking_callback    l_blocking_ast;
 139
 140         struct obd_export    *l_export;
 141         struct lustre_handle *l_connh;
 142         __u32                 l_flags;
 143         struct lustre_handle   l_remote_handle;
 144         void                 *l_data;
 145         __u32                 l_data_len;
 146         void                 *l_cookie;
 147         int                   l_cookie_len;
 148         struct ldlm_extent    l_extent;
 149         __u32                 l_version[RES_VERSION_SIZE];
 150
 151         __u32                 l_readers;
 152         __u32                 l_writers;
 153
 154         /* If the lock is granted, a process sleeps on this waitq to learn when
 155          * it's no longer in use.  If the lock is not granted, a process sleeps
 156          * on this waitq to learn when it becomes granted. */
 157         wait_queue_head_t     l_waitq;
 158 };
 159
 160 typedef int (*ldlm_res_compat)(struct ldlm_lock *child, struct ldlm_lock *new);
 161 typedef int (*ldlm_res_policy)(struct ldlm_lock *lock, void *req_cookie,
 162                                ldlm_mode_t mode, void *data);
 163
 164 #define LDLM_PLAIN       10
 165 #define LDLM_EXTENT      11
 166 #define LDLM_MDSINTENT   12
 167
 168 #define LDLM_MIN_TYPE 10
 169 #define LDLM_MAX_TYPE 12
 170
 171 extern ldlm_res_compat ldlm_res_compat_table [];
 172 extern ldlm_res_policy ldlm_res_policy_table [];
 173
 174 struct ldlm_resource {
 175         struct ldlm_namespace *lr_namespace;
 176         struct list_head       lr_hash;
 177         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 178         struct list_head       lr_children; /* list head for child resources */
 179         struct list_head       lr_childof;  /* part of ns_root_list if root res,
 180                                              * part of lr_children if child */
 181
 182         struct list_head       lr_granted;
 183         struct list_head       lr_converting;
 184         struct list_head       lr_waiting;
 185         ldlm_mode_t            lr_most_restr;
 186         __u32                  lr_type; /* PLAIN, EXTENT, or MDSINTENT */
 187         struct ldlm_resource  *lr_root;
 188         __u64                  lr_name[RES_NAME_SIZE];
 189         __u32                  lr_version[RES_VERSION_SIZE];
 190         atomic_t               lr_refcount;
 191         void                  *lr_tmp;
 192 };
 193
 194 struct ldlm_ast_work {
 195         struct ldlm_lock *w_lock;
 196         int               w_blocking;
 197         struct ldlm_lock_desc w_desc;
 198         struct list_head   w_list;
 199         int w_flags;
 200         void *w_data;
 201         int w_datalen;
 202 };
 203
 204 /* Per-export ldlm state. */
 205 struct ldlm_export_data {
 206         struct list_head        led_held_locks;
 207         struct obd_import       led_import;
 208 };
 209
 210 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
 211 {
 212         return (struct ldlm_extent *)(res->lr_name);
 213 }
 214
 215 extern struct obd_ops ldlm_obd_ops;
 216
 217 extern char *ldlm_lockname[];
 218 extern char *ldlm_typename[];
 219 extern char *ldlm_it2str(int it);
 220
 221 #define LDLM_DEBUG(lock, format, a...)                                        \
 222 do {                                                                          \
 223         if (lock->l_resource == NULL) {                                       \
 224                 CDEBUG(D_DLMTRACE, "### " format                              \
 225                        " (UNKNOWN: lock %p(rc=%d/%d,%d) mode %s/%s on "       \
 226                        "res \?\? (rc=\?\?) type \?\?\? remote "LPX64")\n"     \
 227                        , ## a, lock, lock->l_refc, lock->l_readers,           \
 228                        lock->l_writers,                                       \
 229                        ldlm_lockname[lock->l_granted_mode],                   \
 230                        ldlm_lockname[lock->l_req_mode],                       \
 231                        lock->l_remote_handle.addr);                           \
 232                 break;                                                        \
 233         }                                                                     \
 234         if (lock->l_resource->lr_type == LDLM_EXTENT) {                       \
 235                 CDEBUG(D_DLMTRACE, "### " format                              \
 236                        " (%s: lock %p(rc=%d/%d,%d) mode %s/%s on res "        \
 237                        LPU64" (rc=%d) type %s ["LPU64"->"LPU64"] remote "     \
 238                        LPX64")\n" , ## a,                                     \
 239                        lock->l_resource->lr_namespace->ns_name, lock,         \
 240                        lock->l_refc, lock->l_readers, lock->l_writers,        \
 241                        ldlm_lockname[lock->l_granted_mode],                   \
 242                        ldlm_lockname[lock->l_req_mode],                       \
 243                        lock->l_resource->lr_name[0],                          \
 244                        atomic_read(&lock->l_resource->lr_refcount),           \
 245                        ldlm_typename[lock->l_resource->lr_type],              \
 246                        lock->l_extent.start, lock->l_extent.end,              \
 247                        lock->l_remote_handle.addr);                           \
 248                 break;                                                        \
 249         }                                                                     \
 250         {                                                                     \
 251                 CDEBUG(D_DLMTRACE, "### " format                              \
 252                        " (%s: lock %p(rc=%d/%d,%d) mode %s/%s on res "        \
 253                        LPU64" (rc=%d) type %s remote "LPX64")\n" , ## a,      \
 254                        lock->l_resource->lr_namespace->ns_name, lock,         \
 255                        lock->l_refc, lock->l_readers, lock->l_writers,        \
 256                        ldlm_lockname[lock->l_granted_mode],                   \
 257                        ldlm_lockname[lock->l_req_mode],                       \
 258                        lock->l_resource->lr_name[0],                          \
 259                        atomic_read(&lock->l_resource->lr_refcount),           \
 260                        ldlm_typename[lock->l_resource->lr_type],              \
 261                        lock->l_remote_handle.addr);                           \
 262         }                                                                     \
 263 } while (0)
 264
 265 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 266         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 267
 268 /* For internal LDLM use */
 269 extern struct lustre_lock ldlm_everything_lock;
 270
 271 /* ldlm_extent.c */
 272 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 273 int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *);
 274
 275 /* ldlm_lockd.c */
 276 int ldlm_handle_enqueue(struct ptlrpc_request *req);
 277 int ldlm_handle_convert(struct ptlrpc_request *req);
 278 int ldlm_handle_cancel(struct ptlrpc_request *req);
 279 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
 280
 281 /* ldlm_lock.c */
 282 void ldlm_register_intent(int (*arg)(struct ldlm_lock *lock, void *req_cookie,
 283                                      ldlm_mode_t mode, void *data));
 284 void ldlm_unregister_intent(void);
 285 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 286 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *, int strict);
 287 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 288 void ldlm_cancel_callback(struct ldlm_lock *lock);
 289
 290 static inline struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *h)
 291 {
 292         return __ldlm_handle2lock(h, 1);
 293 }
 294
 295 #define LDLM_LOCK_PUT(lock)                     \
 296 do {                                            \
 297         /*LDLM_DEBUG(lock, "put");*/            \
 298         ldlm_lock_put(lock);                    \
 299 } while (0)
 300
 301 #define LDLM_LOCK_GET(lock)                     \
 302 ({                                              \
 303         ldlm_lock_get(lock);                    \
 304         /*LDLM_DEBUG(lock, "get");*/            \
 305         lock;                                   \
 306 })
 307
 308 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 309 void ldlm_lock_put(struct ldlm_lock *lock);
 310 void ldlm_lock_destroy(struct ldlm_lock *lock);
 311 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 312 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 313 void ldlm_lock_addref_internal(struct ldlm_lock* , __u32 mode);
 314 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 315 void ldlm_grant_lock(struct ldlm_lock *lock);
 316 int ldlm_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
 317                     void *cookie, int cookielen, ldlm_mode_t mode,
 318                     struct lustre_handle *lockh);
 319 struct ldlm_lock *
 320 ldlm_lock_create(struct ldlm_namespace *ns,
 321                  struct lustre_handle *parent_lock_handle,
 322                  __u64 *res_id, __u32 type, ldlm_mode_t mode, void *data,
 323                  __u32 data_len);
 324 ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock *lock, void *cookie,
 325                                int cookie_len, int *flags,
 326                                ldlm_completion_callback completion,
 327                                ldlm_blocking_callback blocking);
 328 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 329                                         int *flags);
 330 void ldlm_lock_cancel(struct ldlm_lock *lock);
 331 void ldlm_cancel_locks_for_export(struct obd_export *export);
 332 void ldlm_run_ast_work(struct list_head *rpc_list);
 333 void ldlm_reprocess_all(struct ldlm_resource *res);
 334 void ldlm_lock_dump(struct ldlm_lock *lock);
 335
 336 /* ldlm_test.c */
 337 int ldlm_test(struct obd_device *device, struct lustre_handle *connh);
 338 int ldlm_regression_start(struct obd_device *obddev,
 339                           struct lustre_handle *connh,
 340                           unsigned int threads, unsigned int max_locks_in,
 341                           unsigned int num_resources_in,
 342                           unsigned int num_extents_in);
 343 int ldlm_regression_stop(void);
 344
 345
 346 /* resource.c */
 347 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 348 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int local_only);
 349 int ldlm_namespace_free(struct ldlm_namespace *ns);
 350 int ldlm_proc_setup(struct obd_device *obd);
 351 void ldlm_proc_cleanup(struct obd_device *obd);
 352
 353 /* resource.c - internal */
 354 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 355                                         struct ldlm_resource *parent,
 356                                         __u64 *name, __u32 type, int create);
 357 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 358 int ldlm_resource_put(struct ldlm_resource *res);
 359 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 360                             struct ldlm_lock *lock);
 361 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 362 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 363 void ldlm_dump_all_namespaces(void);
 364 void ldlm_namespace_dump(struct ldlm_namespace *);
 365 void ldlm_resource_dump(struct ldlm_resource *);
 366 int ldlm_lock_change_resource(struct ldlm_lock *, __u64 new_resid[3]);
 367
 368 /* ldlm_request.c */
 369 int ldlm_completion_ast(struct ldlm_lock *lock, int flags);
 370 int ldlm_cli_enqueue(struct lustre_handle *conn,
 371                      struct ptlrpc_request *req,
 372                      struct ldlm_namespace *ns,
 373                      struct lustre_handle *parent_lock_handle,
 374                      __u64 *res_id,
 375                      __u32 type,
 376                      void *cookie, int cookielen,
 377                      ldlm_mode_t mode,
 378                      int *flags,
 379                      ldlm_completion_callback completion,
 380                      ldlm_blocking_callback callback,
 381                      void *data,
 382                      __u32 data_len,
 383                      struct lustre_handle *lockh);
 384 int ldlm_match_or_enqueue(struct lustre_handle *connh,
 385                           struct ptlrpc_request *req,
 386                           struct ldlm_namespace *ns,
 387                           struct lustre_handle *parent_lock_handle,
 388                           __u64 *res_id,
 389                           __u32 type,
 390                           void *cookie, int cookielen,
 391                           ldlm_mode_t mode,
 392                           int *flags,
 393                           ldlm_completion_callback completion,
 394                           ldlm_blocking_callback callback,
 395                           void *data,
 396                           __u32 data_len,
 397                           struct lustre_handle *lockh);
 398 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 399                     void *data, __u32 data_len);
 400 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 401 int ldlm_cli_cancel(struct lustre_handle *lockh);
 402 int ldlm_cli_cancel_unused(struct ldlm_namespace *, __u64 *, int local_only);
 403
 404 /* mds/handler.c */
 405 /* This has to be here because recurisve inclusion sucks. */
 406 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 407                      void *data, __u32 data_len, int flag);
 408
 409 #endif /* __KERNEL__ */
 410
 411 /* ioctls for trying requests */
 412 #define IOC_LDLM_TYPE                   'f'
 413 #define IOC_LDLM_MIN_NR                 40
 414
 415 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 416 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 417 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 418 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 419 #define IOC_LDLM_MAX_NR                 43
 420
 421 #endif