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 int cluster_host;
  16 typedef int cluster_pid;
  17
  18 typedef enum {
  19         ELDLM_OK = 0,
  20
  21         ELDLM_LOCK_CHANGED = 300,
  22
  23         ELDLM_NAMESPACE_EXISTS = 400,
  24         ELDLM_BAD_NAMESPACE    = 401
  25 } ldlm_error_t;
  26
  27 #define LDLM_FL_LOCK_CHANGED   (1 << 0)
  28 #define LDLM_FL_BLOCK_GRANTED  (1 << 1)
  29 #define LDLM_FL_BLOCK_CONV     (1 << 2)
  30 #define LDLM_FL_BLOCK_WAIT     (1 << 3)
  31
  32 #define L2B(c) (1 << c)
  33
  34 /* compatibility matrix */
  35 #define LCK_COMPAT_EX  L2B(LCK_NL)
  36 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  37 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  38 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  39 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  40 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  41
  42 static ldlm_mode_t lck_compat_array[] = {
  43         [LCK_EX] LCK_COMPAT_EX,
  44         [LCK_PW] LCK_COMPAT_PW,
  45         [LCK_PR] LCK_COMPAT_PR,
  46         [LCK_CW] LCK_COMPAT_CW,
  47         [LCK_CR] LCK_COMPAT_CR,
  48         [LCK_NL] LCK_COMPAT_NL
  49 };
  50
  51 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  52 {
  53        if (exist < LCK_EX || exist > LCK_NL)
  54               LBUG();
  55        if (new < LCK_EX || new > LCK_NL)
  56               LBUG();
  57
  58        return (lck_compat_array[exist] & L2B(new));
  59 }
  60
  61 /*
  62  *
  63  * cluster name spaces
  64  *
  65  */
  66
  67 #define DLM_OST_NAMESPACE 1
  68 #define DLM_MDS_NAMESPACE 2
  69
  70 /* XXX
  71    - do we just separate this by security domains and use a prefix for
  72      multiple namespaces in the same domain?
  73    -
  74 */
  75
  76 struct ldlm_namespace {
  77         struct list_head      ns_link;      /* in the list of ns's */
  78         __u32                 ns_id;        /* identifier of ns */
  79         struct list_head     *ns_hash;      /* hash table for ns */
  80         atomic_t              ns_refcount;  /* count of resources in the hash */
  81         struct list_head      ns_root_list; /* all root resources in ns */
  82         struct obd_device    *ns_obddev;
  83 };
  84
  85 /*
  86  *
  87  * Resource hash table
  88  *
  89  */
  90
  91 #define RES_HASH_BITS 14
  92 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
  93 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
  94
  95 struct ldlm_lock;
  96
  97 typedef int (*ldlm_lock_callback)(struct ldlm_lock *lock, struct ldlm_lock *new,
  98                                   void *data, __u32 data_len);
  99
 100 struct ldlm_lock {
 101         struct ldlm_resource *l_resource;
 102         struct ldlm_lock     *l_parent;
 103         struct list_head      l_children;
 104         struct list_head      l_childof;
 105         struct list_head      l_res_link; /*position in one of three res lists*/
 106         ldlm_mode_t           l_req_mode;
 107         ldlm_mode_t           l_granted_mode;
 108         ldlm_lock_callback    l_completion_ast;
 109         ldlm_lock_callback    l_blocking_ast;
 110         struct ptlrpc_connection *l_connection;
 111         void                 *l_data;
 112         __u32                 l_data_len;
 113         struct ldlm_extent    l_extent;
 114         struct ldlm_handle    l_remote_handle;
 115         //void                 *l_event;
 116         //XXX cluster_host    l_holder;
 117         __u32                 l_version[RES_VERSION_SIZE];
 118 };
 119
 120 typedef int (*ldlm_res_compat)(struct ldlm_lock *child, struct ldlm_lock *new);
 121 typedef int (*ldlm_res_policy)(struct ldlm_resource *parent,
 122                                struct ldlm_extent *req_ex,
 123                                struct ldlm_extent *new_ex,
 124                                ldlm_mode_t mode, void *data);
 125
 126 #define LDLM_PLAIN       0x0
 127 #define LDLM_EXTENT      0x1
 128 #define LDLM_MDSINTENT   0x2
 129
 130 #define LDLM_MAX_TYPE    0x2
 131 extern ldlm_res_compat ldlm_res_compat_table [];
 132 extern ldlm_res_policy ldlm_res_policy_table [];
 133
 134 struct ldlm_resource {
 135         struct ldlm_namespace *lr_namespace;
 136         struct list_head       lr_hash;
 137         struct list_head       lr_rootlink; /* link all root resources in NS */
 138         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 139         struct list_head       lr_children; /* list head for child resources */
 140         struct list_head       lr_childof;  /* part of child list of parent */
 141
 142         struct list_head       lr_granted;
 143         struct list_head       lr_converting;
 144         struct list_head       lr_waiting;
 145         ldlm_mode_t            lr_most_restr;
 146         atomic_t               lr_refcount;
 147         __u32                  lr_type; /* PLAIN, EXTENT, or MDSINTENT */
 148         struct ldlm_resource  *lr_root;
 149         //XXX cluster_host          lr_master;
 150         __u64                  lr_name[RES_NAME_SIZE];
 151         __u32                  lr_version[RES_VERSION_SIZE];
 152         spinlock_t             lr_lock;
 153 };
 154
 155 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
 156 {
 157         return (struct ldlm_extent *)(res->lr_name);
 158 }
 159
 160 static inline void *ldlm_handle2object(struct ldlm_handle *handle)
 161 {
 162         if (handle)
 163                 return (void *)(unsigned long)(handle->addr);
 164         return NULL;
 165 }
 166
 167 static inline void ldlm_object2handle(void *object, struct ldlm_handle *handle)
 168 {
 169         handle->addr = (__u64)(unsigned long)object;
 170 }
 171
 172 extern struct list_head ldlm_namespaces;
 173 extern spinlock_t ldlm_spinlock;
 174
 175 static inline void ldlm_lock(void)
 176 {
 177         spin_lock(&ldlm_spinlock);
 178 }
 179
 180 static inline void ldlm_unlock(void)
 181 {
 182         spin_unlock(&ldlm_spinlock);
 183 }
 184
 185 extern struct obd_ops ldlm_obd_ops;
 186
 187 /* ldlm_extent.c */
 188 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 189 int ldlm_extent_policy(struct ldlm_resource *, struct ldlm_extent *,
 190                        struct ldlm_extent *, ldlm_mode_t, void *);
 191
 192 /* ldlm_lock.c */
 193 void ldlm_lock_free(struct ldlm_lock *lock);
 194 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 195 ldlm_error_t ldlm_local_lock_create(__u32 ns_id,
 196                                     struct ldlm_handle *parent_lock_handle,
 197                                     __u64 *res_id,
 198                                     __u32 type,
 199                                     struct ldlm_handle *lockh);
 200 ldlm_error_t ldlm_local_lock_enqueue(struct ldlm_handle *lockh,
 201                                      ldlm_mode_t mode,
 202                                      struct ldlm_extent *req_ex,
 203                                      int *flags,
 204                                      ldlm_lock_callback completion,
 205                                      ldlm_lock_callback blocking,
 206                                      void *data,
 207                                      __u32 data_len);
 208 ldlm_error_t ldlm_local_lock_convert(struct ldlm_handle *lockh,
 209                                      int new_mode, int *flags);
 210 ldlm_error_t ldlm_local_lock_cancel(struct ldlm_handle *lockh);
 211 void ldlm_lock_dump(struct ldlm_lock *lock);
 212
 213 /* ldlm_test.c */
 214 int ldlm_test(struct obd_device *device);
 215
 216 /* resource.c */
 217 struct ldlm_namespace *ldlm_namespace_find(__u32 id);
 218 ldlm_error_t ldlm_namespace_new(struct obd_device *, __u32 id,
 219                                 struct ldlm_namespace **);
 220 int ldlm_namespace_free(struct ldlm_namespace *ns);
 221 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 222                                         struct ldlm_resource *parent,
 223                                         __u64 *name, __u32 type, int create);
 224 int ldlm_resource_put(struct ldlm_resource *res);
 225 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 226                             struct ldlm_lock *lock);
 227 void ldlm_resource_del_lock(struct ldlm_lock *lock);
 228 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 229 void ldlm_resource_dump(struct ldlm_resource *res);
 230
 231 /* ldlm_request.c */
 232 int ldlm_cli_namespace_new(struct obd_device *, struct ptlrpc_client *,
 233                            struct ptlrpc_connection *,
 234                            __u32 ns_id, struct ptlrpc_request **);
 235 int ldlm_cli_enqueue(struct ptlrpc_client *cl, struct ptlrpc_connection *peer,
 236                      __u32 ns_id,
 237                      struct ldlm_handle *parent_lock_handle,
 238                      __u64 *res_id,
 239                      __u32 type,
 240                      struct ldlm_extent *req_ex,
 241                      ldlm_mode_t mode,
 242                      int *flags,
 243                      void *data,
 244                      __u32 data_len,
 245                      struct ldlm_handle *lockh,
 246                      struct ptlrpc_request **request);
 247 int ldlm_cli_callback(struct ldlm_lock *lock, struct ldlm_lock *new,
 248                       void *data, __u32 data_len);
 249 int ldlm_cli_convert(struct ptlrpc_client *, struct ldlm_handle *,
 250                      int new_mode, int *flags, struct ptlrpc_request **);
 251 int ldlm_cli_cancel(struct ptlrpc_client *, struct ldlm_handle *,
 252                     struct ptlrpc_request **);
 253
 254
 255 #endif /* __KERNEL__ */
 256
 257 /* ioctls for trying requests */
 258 #define IOC_LDLM_TYPE                   'f'
 259 #define IOC_LDLM_MIN_NR                 40
 260
 261 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 262 #define IOC_LDLM_MAX_NR                 41
 263
 264 #endif