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
  42 #define LDLM_CB_BLOCKING    1
  43 #define LDLM_CB_DYING       2
  44
  45 #define L2B(c) (1 << c)
  46
  47 /* compatibility matrix */
  48 #define LCK_COMPAT_EX  L2B(LCK_NL)
  49 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  50 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  51 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  52 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  53 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  54
  55 static ldlm_mode_t lck_compat_array[] = {
  56         [LCK_EX] LCK_COMPAT_EX,
  57         [LCK_PW] LCK_COMPAT_PW,
  58         [LCK_PR] LCK_COMPAT_PR,
  59         [LCK_CW] LCK_COMPAT_CW,
  60         [LCK_CR] LCK_COMPAT_CR,
  61         [LCK_NL] LCK_COMPAT_NL
  62 };
  63
  64 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  65 {
  66        if (exist < LCK_EX || exist > LCK_NL)
  67               LBUG();
  68        if (new < LCK_EX || new > LCK_NL)
  69               LBUG();
  70
  71        return (lck_compat_array[exist] & L2B(new));
  72 }
  73
  74 /*
  75  *
  76  * cluster name spaces
  77  *
  78  */
  79
  80 #define DLM_OST_NAMESPACE 1
  81 #define DLM_MDS_NAMESPACE 2
  82
  83 /* XXX
  84    - do we just separate this by security domains and use a prefix for
  85      multiple namespaces in the same domain?
  86    -
  87 */
  88
  89 struct ldlm_namespace {
  90         char                  *ns_name;
  91         __u32                  ns_client; /* is this a client-side lock tree? */
  92         struct list_head      *ns_hash; /* hash table for ns */
  93         __u32                  ns_refcount; /* count of resources in the hash */
  94         struct list_head       ns_root_list; /* all root resources in ns */
  95         struct lustre_lock     ns_lock; /* protects hash, refcount, list */
  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         else                                                            \
 233                 CDEBUG(D_DLMTRACE, "### " format                        \
 234                        " (%s: lock %p(rc=%d/%d,%d) mode %s/%s on res "  \
 235                        LPU64" (rc=%d) type %s remote "LPX64")\n" , ## a,      \
 236                        lock->l_resource->lr_namespace->ns_name, lock,   \
 237                        lock->l_refc, lock->l_readers, lock->l_writers,  \
 238                        ldlm_lockname[lock->l_granted_mode],             \
 239                        ldlm_lockname[lock->l_req_mode],                 \
 240                        lock->l_resource->lr_name[0],                    \
 241                        atomic_read(&lock->l_resource->lr_refcount),     \
 242                        ldlm_typename[lock->l_resource->lr_type],        \
 243                        lock->l_remote_handle.addr);                     \
 244 } while (0)
 245
 246 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 247         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 248
 249 /* ldlm_extent.c */
 250 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 251 int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *);
 252
 253 /* ldlm_lockd.c */
 254 int ldlm_handle_enqueue(struct ptlrpc_request *req);
 255 int ldlm_handle_convert(struct ptlrpc_request *req);
 256 int ldlm_handle_cancel(struct ptlrpc_request *req);
 257
 258 /* ldlm_lock.c */
 259 void ldlm_register_intent(int (*arg)(struct ldlm_lock *lock, void *req_cookie,
 260                                      ldlm_mode_t mode, void *data));
 261 void ldlm_unregister_intent(void);
 262 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 263 struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle);
 264 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 265
 266 #define LDLM_LOCK_PUT(lock)                     \
 267 do {                                            \
 268         /*LDLM_DEBUG(lock, "put");*/            \
 269         ldlm_lock_put(lock);                    \
 270 } while (0)
 271
 272 #define LDLM_LOCK_GET(lock)                     \
 273 ({                                              \
 274         ldlm_lock_get(lock);                    \
 275         /*LDLM_DEBUG(lock, "get");*/            \
 276         lock;                                   \
 277 })
 278
 279 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 280 void ldlm_lock_put(struct ldlm_lock *lock);
 281 void ldlm_lock_destroy(struct ldlm_lock *lock);
 282 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 283 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 284 void ldlm_lock_addref_internal(struct ldlm_lock* , __u32 mode);
 285 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 286 void ldlm_grant_lock(struct ldlm_lock *lock);
 287 int ldlm_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
 288                     void *cookie, int cookielen, ldlm_mode_t mode,
 289                     struct lustre_handle *lockh);
 290 struct ldlm_lock *
 291 ldlm_lock_create(struct ldlm_namespace *ns,
 292                  struct lustre_handle *parent_lock_handle,
 293                  __u64 *res_id, __u32 type, ldlm_mode_t mode, void *data,
 294                  __u32 data_len);
 295 ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock *lock, void *cookie,
 296                                int cookie_len, int *flags,
 297                                ldlm_completion_callback completion,
 298                                ldlm_blocking_callback blocking);
 299 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 300                                         int *flags);
 301 void ldlm_lock_cancel(struct ldlm_lock *lock);
 302 void ldlm_run_ast_work(struct list_head *rpc_list);
 303 void ldlm_reprocess_all(struct ldlm_resource *res);
 304 void ldlm_lock_dump(struct ldlm_lock *lock);
 305
 306 /* ldlm_test.c */
 307 int ldlm_test(struct obd_device *device, struct lustre_handle *connh);
 308 int ldlm_regression_start(struct obd_device *obddev,
 309                           struct lustre_handle *connh,
 310                           unsigned int threads, unsigned int max_locks_in,
 311                           unsigned int num_resources_in,
 312                           unsigned int num_extents_in);
 313 int ldlm_regression_stop(void);
 314
 315
 316 /* resource.c */
 317 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 318 int ldlm_namespace_free(struct ldlm_namespace *ns);
 319 int ldlm_proc_setup(struct obd_device *obd);
 320 void ldlm_proc_cleanup(struct obd_device *obd);
 321
 322 /* resource.c - internal */
 323 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 324                                         struct ldlm_resource *parent,
 325                                         __u64 *name, __u32 type, int create);
 326 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 327 int ldlm_resource_put(struct ldlm_resource *res);
 328 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 329                             struct ldlm_lock *lock);
 330 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 331 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 332 void ldlm_dump_all_namespaces(void);
 333 void ldlm_namespace_dump(struct ldlm_namespace *);
 334 void ldlm_resource_dump(struct ldlm_resource *);
 335 int ldlm_lock_change_resource(struct ldlm_lock *, __u64 new_resid[3]);
 336
 337 /* ldlm_request.c */
 338 int ldlm_completion_ast(struct ldlm_lock *lock, int flags);
 339 int ldlm_cli_enqueue(struct lustre_handle *conn,
 340                      struct ptlrpc_request *req,
 341                      struct ldlm_namespace *ns,
 342                      struct lustre_handle *parent_lock_handle,
 343                      __u64 *res_id,
 344                      __u32 type,
 345                      void *cookie, int cookielen,
 346                      ldlm_mode_t mode,
 347                      int *flags,
 348                      ldlm_completion_callback completion,
 349                      ldlm_blocking_callback callback,
 350                      void *data,
 351                      __u32 data_len,
 352                      struct lustre_handle *lockh);
 353 int ldlm_match_or_enqueue(struct lustre_handle *connh,
 354                           struct ptlrpc_request *req,
 355                           struct ldlm_namespace *ns,
 356                           struct lustre_handle *parent_lock_handle,
 357                           __u64 *res_id,
 358                           __u32 type,
 359                           void *cookie, int cookielen,
 360                           ldlm_mode_t mode,
 361                           int *flags,
 362                           ldlm_completion_callback completion,
 363                           ldlm_blocking_callback callback,
 364                           void *data,
 365                           __u32 data_len,
 366                           struct lustre_handle *lockh);
 367 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 368                     void *data, __u32 data_len);
 369 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 370 int ldlm_cli_cancel(struct lustre_handle *lockh);
 371 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns, __u64 *res_id);
 372
 373 /* mds/handler.c */
 374 /* This has to be here because recurisve inclusion sucks. */
 375 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 376                      void *data, __u32 data_len, int flag);
 377
 378 #endif /* __KERNEL__ */
 379
 380 /* ioctls for trying requests */
 381 #define IOC_LDLM_TYPE                   'f'
 382 #define IOC_LDLM_MIN_NR                 40
 383
 384 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 385 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 386 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 387 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 388 #define IOC_LDLM_MAX_NR                 43
 389
 390 #endif