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/obd_class.h>
  12 #include <linux/lustre_net.h>
  13
  14 #define OBD_LDLM_DEVICENAME  "ldlm"
  15
  16 typedef enum {
  17         ELDLM_OK = 0,
  18
  19         ELDLM_LOCK_CHANGED = 300,
  20         ELDLM_LOCK_ABORTED = 301,
  21         ELDLM_RESOURCE_FREED = 302,
  22
  23         ELDLM_NAMESPACE_EXISTS = 400,
  24         ELDLM_BAD_NAMESPACE    = 401
  25 } ldlm_error_t;
  26
  27 #define LDLM_NAMESPACE_SERVER 0
  28 #define LDLM_NAMESPACE_CLIENT 1
  29
  30 #define LDLM_FL_LOCK_CHANGED   (1 << 0)
  31 #define LDLM_FL_BLOCK_GRANTED  (1 << 1)
  32 #define LDLM_FL_BLOCK_CONV     (1 << 2)
  33 #define LDLM_FL_BLOCK_WAIT     (1 << 3)
  34 #define LDLM_FL_CBPENDING      (1 << 4)
  35 #define LDLM_FL_AST_SENT       (1 << 5)
  36 #define LDLM_FL_DESTROYED      (1 << 6)
  37 #define LDLM_FL_WAIT_NOREPROC  (1 << 7)
  38
  39 #define L2B(c) (1 << c)
  40
  41 /* compatibility matrix */
  42 #define LCK_COMPAT_EX  L2B(LCK_NL)
  43 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  44 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  45 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  46 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  47 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  48
  49 static ldlm_mode_t lck_compat_array[] = {
  50         [LCK_EX] LCK_COMPAT_EX,
  51         [LCK_PW] LCK_COMPAT_PW,
  52         [LCK_PR] LCK_COMPAT_PR,
  53         [LCK_CW] LCK_COMPAT_CW,
  54         [LCK_CR] LCK_COMPAT_CR,
  55         [LCK_NL] LCK_COMPAT_NL
  56 };
  57
  58 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  59 {
  60        if (exist < LCK_EX || exist > LCK_NL)
  61               LBUG();
  62        if (new < LCK_EX || new > LCK_NL)
  63               LBUG();
  64
  65        return (lck_compat_array[exist] & L2B(new));
  66 }
  67
  68 /*
  69  *
  70  * cluster name spaces
  71  *
  72  */
  73
  74 #define DLM_OST_NAMESPACE 1
  75 #define DLM_MDS_NAMESPACE 2
  76
  77 /* XXX
  78    - do we just separate this by security domains and use a prefix for
  79      multiple namespaces in the same domain?
  80    -
  81 */
  82
  83 struct ldlm_namespace {
  84         char                  *ns_name;
  85         struct ptlrpc_client   ns_rpc_client;/* used for revocation callbacks */
  86         __u32                  ns_client; /* is this a client-side lock tree? */
  87         struct list_head      *ns_hash; /* hash table for ns */
  88         __u32                  ns_refcount; /* count of resources in the hash */
  89         struct list_head       ns_root_list; /* all root resources in ns */
  90         struct lustre_lock     ns_lock; /* protects hash, refcount, list */
  91         struct list_head       ns_list_chain; /* position in global NS list */
  92         struct proc_dir_entry *ns_proc_dir;
  93 };
  94
  95 /*
  96  *
  97  * Resource hash table
  98  *
  99  */
 100
 101 #define RES_HASH_BITS 14
 102 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 103 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 104
 105 struct ldlm_lock;
 106
 107 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 108                                       struct ldlm_lock_desc *new, void *data,
 109                                       __u32 data_len);
 110
 111 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags);
 112
 113 struct ldlm_lock {
 114         __u64                 l_random;
 115         int                   l_refc;
 116         struct ldlm_resource *l_resource;
 117         struct ldlm_lock     *l_parent;
 118         struct list_head      l_children;
 119         struct list_head      l_childof;
 120         struct list_head      l_res_link; /*position in one of three res lists*/
 121         struct list_head      l_inode_link; /* position in inode info list */
 122         struct list_head      l_export_chain; /* per-export chain of locks */
 123         struct list_head      l_pending_chain; /* locks with callbacks pending */
 124         unsigned long         l_callback_timeout;
 125
 126         ldlm_mode_t           l_req_mode;
 127         ldlm_mode_t           l_granted_mode;
 128
 129         ldlm_completion_callback    l_completion_ast;
 130         ldlm_blocking_callback    l_blocking_ast;
 131
 132         struct obd_export    *l_export;
 133         struct ptlrpc_client *l_client;
 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 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
 198 {
 199         return (struct ldlm_extent *)(res->lr_name);
 200 }
 201
 202 extern struct obd_ops ldlm_obd_ops;
 203
 204
 205 extern char *ldlm_lockname[];
 206 extern char *ldlm_typename[];
 207 extern char *ldlm_it2str(int it);
 208
 209 #define LDLM_DEBUG(lock, format, a...)                                  \
 210 do {                                                                    \
 211         if (lock->l_resource == NULL)                                   \
 212                 CDEBUG(D_DLMTRACE, "### " format                        \
 213                        " (UNKNOWN: lock %p(rc=%d/%d,%d) mode %s/%s on " \
 214                        "res \?\? (rc=\?\?) type \?\?\? remote %Lx)\n" , \
 215                        ## a, lock, lock->l_refc, lock->l_readers,       \
 216                        lock->l_writers,                                 \
 217                        ldlm_lockname[lock->l_granted_mode],             \
 218                        ldlm_lockname[lock->l_req_mode],                 \
 219                        lock->l_remote_handle.addr);                     \
 220         else                                                            \
 221                 CDEBUG(D_DLMTRACE, "### " format                        \
 222                        " (%s: lock %p(rc=%d/%d,%d) mode %s/%s on res "  \
 223                        "%Lu (rc=%d) type %s remote %Lx)\n" , ## a,      \
 224                        lock->l_resource->lr_namespace->ns_name, lock,   \
 225                        lock->l_refc, lock->l_readers, lock->l_writers,  \
 226                        ldlm_lockname[lock->l_granted_mode],             \
 227                        ldlm_lockname[lock->l_req_mode],                 \
 228                        lock->l_resource->lr_name[0],                    \
 229                        atomic_read(&lock->l_resource->lr_refcount),     \
 230                        ldlm_typename[lock->l_resource->lr_type],        \
 231                        lock->l_remote_handle.addr);                     \
 232 } while (0)
 233
 234 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 235         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 236
 237 /* ldlm_extent.c */
 238 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 239 int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *);
 240
 241 /* ldlm_lockd.c */
 242 int ldlm_handle_enqueue(struct ptlrpc_request *req);
 243 int ldlm_handle_convert(struct ptlrpc_request *req);
 244 int ldlm_handle_cancel(struct ptlrpc_request *req);
 245
 246 /* ldlm_lock.c */
 247 void ldlm_register_intent(int (*arg)(struct ldlm_lock *lock, void *req_cookie,
 248                                      ldlm_mode_t mode, void *data));
 249 void ldlm_unregister_intent(void);
 250 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 251 struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle);
 252 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 253
 254 #define LDLM_LOCK_PUT(lock)                     \
 255 do {                                            \
 256         /*LDLM_DEBUG(lock, "put");*/            \
 257         ldlm_lock_put(lock);                    \
 258 } while (0)
 259
 260 #define LDLM_LOCK_GET(lock)                     \
 261 ({                                              \
 262         ldlm_lock_get(lock);                    \
 263         /*LDLM_DEBUG(lock, "get");*/            \
 264         lock;                                   \
 265 })
 266
 267 void ldlm_lock_put(struct ldlm_lock *lock);
 268 void ldlm_lock_destroy(struct ldlm_lock *lock);
 269 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 270 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 271 void ldlm_lock_addref_internal(struct ldlm_lock* , __u32 mode);
 272 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 273 void ldlm_grant_lock(struct ldlm_lock *lock);
 274 int ldlm_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
 275                     void *cookie, int cookielen, ldlm_mode_t mode,
 276                     struct lustre_handle *lockh);
 277 struct ldlm_lock *
 278 ldlm_lock_create(struct ldlm_namespace *ns,
 279                  struct lustre_handle *parent_lock_handle,
 280                  __u64 *res_id, __u32 type, ldlm_mode_t mode, void *data,
 281                  __u32 data_len);
 282 ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock *lock, void *cookie,
 283                                int cookie_len, int *flags,
 284                                ldlm_completion_callback completion,
 285                                ldlm_blocking_callback blocking);
 286 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 287                                         int *flags);
 288 void ldlm_lock_cancel(struct ldlm_lock *lock);
 289 void ldlm_run_ast_work(struct list_head *rpc_list);
 290 void ldlm_reprocess_all(struct ldlm_resource *res);
 291 void ldlm_lock_dump(struct ldlm_lock *lock);
 292
 293 /* ldlm_test.c */
 294 int ldlm_test(struct obd_device *device, struct lustre_handle *connh);
 295 int ldlm_regression_start(struct obd_device *obddev,
 296                 struct lustre_handle *connh, int count);
 297 int ldlm_regression_stop(void);
 298
 299
 300 /* resource.c */
 301 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 302 int ldlm_namespace_free(struct ldlm_namespace *ns);
 303 int ldlm_proc_setup(struct obd_device *obd);
 304 void ldlm_proc_cleanup(struct obd_device *obd);
 305
 306 /* resource.c - internal */
 307 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 308                                         struct ldlm_resource *parent,
 309                                         __u64 *name, __u32 type, int create);
 310 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 311 int ldlm_resource_put(struct ldlm_resource *res);
 312 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 313                             struct ldlm_lock *lock);
 314 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 315 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 316 void ldlm_dump_all_namespaces(void);
 317 void ldlm_namespace_dump(struct ldlm_namespace *);
 318 void ldlm_resource_dump(struct ldlm_resource *);
 319 int ldlm_lock_change_resource(struct ldlm_lock *, __u64 new_resid[3]);
 320
 321 /* ldlm_request.c */
 322 int ldlm_completion_ast(struct ldlm_lock *lock, int flags);
 323 int ldlm_cli_enqueue(struct lustre_handle *conn,
 324                      struct ptlrpc_request *req,
 325                      struct ldlm_namespace *ns,
 326                      struct lustre_handle *parent_lock_handle,
 327                      __u64 *res_id,
 328                      __u32 type,
 329                      void *cookie, int cookielen,
 330                      ldlm_mode_t mode,
 331                      int *flags,
 332                      ldlm_completion_callback completion,
 333                      ldlm_blocking_callback callback,
 334                      void *data,
 335                      __u32 data_len,
 336                      struct lustre_handle *lockh);
 337 int ldlm_match_or_enqueue(struct lustre_handle *connh,
 338                           struct ptlrpc_request *req,
 339                           struct ldlm_namespace *ns,
 340                           struct lustre_handle *parent_lock_handle,
 341                           __u64 *res_id,
 342                           __u32 type,
 343                           void *cookie, int cookielen,
 344                           ldlm_mode_t mode,
 345                           int *flags,
 346                           ldlm_completion_callback completion,
 347                           ldlm_blocking_callback callback,
 348                           void *data,
 349                           __u32 data_len,
 350                           struct lustre_handle *lockh);
 351 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 352                     void *data, __u32 data_len);
 353 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 354 int ldlm_cli_cancel(struct lustre_handle *lockh);
 355
 356 /* mds/handler.c */
 357 /* This has to be here because recurisve inclusion sucks. */
 358 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 359                      void *data, __u32 data_len);
 360
 361 #endif /* __KERNEL__ */
 362
 363 /* ioctls for trying requests */
 364 #define IOC_LDLM_TYPE                   'f'
 365 #define IOC_LDLM_MIN_NR                 40
 366
 367 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 368 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 369 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 370 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 371 #define IOC_LDLM_MAX_NR                 43
 372
 373 #endif