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