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/obd_class.h>
  11 #include <linux/lustre_net.h>
  12
  13 #define OBD_LDLM_DEVICENAME  "ldlm"
  14
  15 typedef enum {
  16         ELDLM_OK = 0,
  17
  18         ELDLM_LOCK_CHANGED = 300,
  19         ELDLM_LOCK_ABORTED = 301,
  20         ELDLM_RESOURCE_FREED = 302,
  21
  22         ELDLM_NAMESPACE_EXISTS = 400,
  23         ELDLM_BAD_NAMESPACE    = 401
  24 } ldlm_error_t;
  25
  26 #define LDLM_NAMESPACE_SERVER 0
  27 #define LDLM_NAMESPACE_CLIENT 1
  28
  29 #define LDLM_FL_LOCK_CHANGED   (1 << 0)
  30 #define LDLM_FL_BLOCK_GRANTED  (1 << 1)
  31 #define LDLM_FL_BLOCK_CONV     (1 << 2)
  32 #define LDLM_FL_BLOCK_WAIT     (1 << 3)
  33 #define LDLM_FL_CBPENDING      (1 << 4)
  34 #define LDLM_FL_AST_SENT       (1 << 5)
  35 #define LDLM_FL_DESTROYED      (1 << 6)
  36
  37 #define L2B(c) (1 << c)
  38
  39 /* compatibility matrix */
  40 #define LCK_COMPAT_EX  L2B(LCK_NL)
  41 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  42 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  43 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  44 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  45 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  46
  47 static ldlm_mode_t lck_compat_array[] = {
  48         [LCK_EX] LCK_COMPAT_EX,
  49         [LCK_PW] LCK_COMPAT_PW,
  50         [LCK_PR] LCK_COMPAT_PR,
  51         [LCK_CW] LCK_COMPAT_CW,
  52         [LCK_CR] LCK_COMPAT_CR,
  53         [LCK_NL] LCK_COMPAT_NL
  54 };
  55
  56 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  57 {
  58        if (exist < LCK_EX || exist > LCK_NL)
  59               LBUG();
  60        if (new < LCK_EX || new > LCK_NL)
  61               LBUG();
  62
  63        return (lck_compat_array[exist] & L2B(new));
  64 }
  65
  66 /*
  67  *
  68  * cluster name spaces
  69  *
  70  */
  71
  72 #define DLM_OST_NAMESPACE 1
  73 #define DLM_MDS_NAMESPACE 2
  74
  75 /* XXX
  76    - do we just separate this by security domains and use a prefix for
  77      multiple namespaces in the same domain?
  78    -
  79 */
  80
  81 struct ldlm_namespace {
  82         char                 *ns_name;
  83         struct ptlrpc_client  ns_rpc_client; /* used for revocation callbacks */
  84         __u32                 ns_client; /* is this a client-side lock tree? */
  85         struct list_head     *ns_hash; /* hash table for ns */
  86         __u32                 ns_refcount; /* count of resources in the hash */
  87         struct list_head      ns_root_list; /* all root resources in ns */
  88         struct lustre_lock    ns_lock; /* protects hash, refcount, list */
  89 };
  90
  91 /*
  92  *
  93  * Resource hash table
  94  *
  95  */
  96
  97 #define RES_HASH_BITS 14
  98 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
  99 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 100
 101 struct ldlm_lock;
 102
 103 typedef int (*ldlm_lock_callback)(struct lustre_handle *lockh,
 104                                   struct ldlm_lock_desc *new, void *data,
 105                                   __u32 data_len, struct ptlrpc_request **req);
 106
 107 struct ldlm_lock {
 108         __u64                  l_random;
 109         int                   l_refc;
 110         struct ldlm_resource *l_resource;
 111         struct ldlm_lock     *l_parent;
 112         struct list_head      l_children;
 113         struct list_head      l_childof;
 114         struct list_head      l_res_link; /*position in one of three res lists*/
 115         atomic_t              l_refcount;
 116
 117         ldlm_mode_t           l_req_mode;
 118         ldlm_mode_t           l_granted_mode;
 119
 120         ldlm_lock_callback    l_completion_ast;
 121         ldlm_lock_callback    l_blocking_ast;
 122
 123         struct ptlrpc_connection *l_connection;
 124         struct ptlrpc_client *l_client;
 125         __u32                 l_flags;
 126         struct lustre_handle    l_remote_handle;
 127         void                 *l_data;
 128         __u32                 l_data_len;
 129         void                 *l_cookie;
 130         int                   l_cookie_len;
 131         struct ldlm_extent    l_extent;
 132         __u32                 l_version[RES_VERSION_SIZE];
 133
 134         __u32                 l_readers;
 135         __u32                 l_writers;
 136
 137         /* If the lock is granted, a process sleeps on this waitq to learn when
 138          * it's no longer in use.  If the lock is not granted, a process sleeps
 139          * on this waitq to learn when it becomes granted. */
 140         wait_queue_head_t     l_waitq;
 141 };
 142
 143 typedef int (*ldlm_res_compat)(struct ldlm_lock *child, struct ldlm_lock *new);
 144 typedef int (*ldlm_res_policy)(struct ldlm_lock *lock, void *req_cookie,
 145                                ldlm_mode_t mode, void *data);
 146
 147 #define LDLM_PLAIN       10
 148 #define LDLM_EXTENT      11
 149 #define LDLM_MDSINTENT   12
 150
 151 #define LDLM_MIN_TYPE 10
 152 #define LDLM_MAX_TYPE 12
 153
 154 extern ldlm_res_compat ldlm_res_compat_table [];
 155 extern ldlm_res_policy ldlm_res_policy_table [];
 156
 157 struct ldlm_resource {
 158         struct ldlm_namespace *lr_namespace;
 159         struct list_head       lr_hash;
 160         struct list_head       lr_rootlink; /* link all root resources in NS */
 161         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 162         struct list_head       lr_children; /* list head for child resources */
 163         struct list_head       lr_childof;  /* part of child list of parent */
 164
 165         struct list_head       lr_granted;
 166         struct list_head       lr_converting;
 167         struct list_head       lr_waiting;
 168         ldlm_mode_t            lr_most_restr;
 169         __u32                  lr_type; /* PLAIN, EXTENT, or MDSINTENT */
 170         struct ldlm_resource  *lr_root;
 171         __u64                  lr_name[RES_NAME_SIZE];
 172         __u32                  lr_version[RES_VERSION_SIZE];
 173         atomic_t               lr_refcount;
 174         void                  *lr_tmp;
 175 };
 176
 177 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
 178 {
 179         return (struct ldlm_extent *)(res->lr_name);
 180 }
 181
 182 extern struct obd_ops ldlm_obd_ops;
 183
 184 #define LDLM_DEBUG(lock, format, a...)                          \
 185 do {                                                            \
 186         CDEBUG(D_DLMTRACE, "### " format                        \
 187                " (%s: lock %p mode %d/%d on res %Lu (rc %d) "   \
 188                " type %d remote %Lx)\n" , ## a,                 \
 189                lock->l_resource->lr_namespace->ns_name, lock,   \
 190                lock->l_granted_mode, lock->l_req_mode,          \
 191                lock->l_resource->lr_name[0],                    \
 192                atomic_read(&lock->l_resource->lr_refcount),     \
 193                lock->l_resource->lr_type,                       \
 194                lock->l_remote_handle.addr);                     \
 195 } while (0)
 196
 197 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 198         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 199
 200 /* ldlm_extent.c */
 201 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 202 int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *);
 203
 204 /* ldlm_lock.c */
 205 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 206 struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *handle);
 207 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 208 void ldlm_lock_put(struct ldlm_lock *lock);
 209 void ldlm_lock_free(struct ldlm_lock *lock);
 210 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 211 void ldlm_lock_addref(struct ldlm_lock *lock, __u32 mode);
 212 void ldlm_lock_decref(struct ldlm_lock *lock, __u32 mode);
 213 void ldlm_grant_lock(struct ldlm_lock *lock);
 214 int ldlm_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
 215                     void *cookie, int cookielen, ldlm_mode_t mode,
 216                     struct lustre_handle *lockh);
 217 struct ldlm_lock *
 218 ldlm_lock_create(struct ldlm_namespace *ns,
 219                  struct lustre_handle *parent_lock_handle,
 220                  __u64 *res_id, __u32 type, ldlm_mode_t mode, void *data,
 221                  __u32 data_len);
 222 ldlm_error_t ldlm_lock_enqueue(struct ldlm_lock *lock, void *cookie,
 223                                int cookie_len, int *flags,
 224                                ldlm_lock_callback completion,
 225                                ldlm_lock_callback blocking);
 226 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 227                                         int *flags);
 228 void ldlm_lock_cancel(struct ldlm_lock *lock);
 229 void ldlm_reprocess_all(struct ldlm_resource *res);
 230 void ldlm_lock_dump(struct ldlm_lock *lock);
 231
 232 /* ldlm_test.c */
 233 int ldlm_test(struct obd_device *device, struct ptlrpc_connection *conn);
 234
 235 /* resource.c */
 236 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 237 int ldlm_namespace_free(struct ldlm_namespace *ns);
 238
 239 /* resource.c - internal */
 240 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 241                                         struct ldlm_resource *parent,
 242                                         __u64 *name, __u32 type, int create);
 243 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 244 int ldlm_resource_put(struct ldlm_resource *res);
 245 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 246                             struct ldlm_lock *lock);
 247 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 248 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 249 void ldlm_resource_dump(struct ldlm_resource *res);
 250 int ldlm_lock_change_resource(struct ldlm_lock *lock, __u64 new_resid[3]);
 251
 252 /* ldlm_request.c */
 253 int ldlm_cli_enqueue(struct ptlrpc_client *cl,
 254                      struct ptlrpc_connection *peer,
 255                      struct ptlrpc_request *req,
 256                      struct ldlm_namespace *ns,
 257                      struct lustre_handle *parent_lock_handle,
 258                      __u64 *res_id,
 259                      __u32 type,
 260                      void *cookie, int cookielen,
 261                      ldlm_mode_t mode,
 262                      int *flags,
 263                      ldlm_lock_callback callback,
 264                      void *data,
 265                      __u32 data_len,
 266                      struct lustre_handle *lockh);
 267 int ldlm_cli_callback(struct ldlm_lock *lock, struct ldlm_lock_desc *new,
 268                       void *data, __u32 data_len, struct ptlrpc_request **reqp);
 269 int ldlm_cli_convert(struct ptlrpc_client *, struct lustre_handle *,
 270                      int new_mode, int *flags);
 271 int ldlm_cli_cancel(struct lustre_handle *);
 272
 273 #endif /* __KERNEL__ */
 274
 275 /* ioctls for trying requests */
 276 #define IOC_LDLM_TYPE                   'f'
 277 #define IOC_LDLM_MIN_NR                 40
 278
 279 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 280 #define IOC_LDLM_MAX_NR                 41
 281
 282 #endif