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 #include <linux/kp30.h>
   9 #include <linux/list.h>
  10
  11 #include <linux/obd_class.h>
  12
  13 #ifdef __KERNEL__
  14
  15 #define OBD_LDLM_DEVICENAME  "ldlm"
  16
  17 typedef  int cluster_host;
  18 typedef  int cluster_pid;
  19
  20 typedef enum {
  21         ELDLM_OK = 0,
  22         ELDLM_BLOCK_GRANTED = 600,
  23         ELDLM_BLOCK_CONV,
  24         ELDLM_BLOCK_WAIT,
  25         ELDLM_BAD_NAMESPACE,
  26         ELDLM_LOCK_CHANGED
  27 } ldlm_error_t;
  28
  29 #define LDLM_FL_LOCK_CHANGED   (1 << 0)
  30 #define LDLM_FL_COMPLETION_AST (1 << 1)
  31 #define LDLM_FL_BLOCKING_AST   (1 << 2)
  32
  33 #define L2B(c) (1 << c)
  34
  35 /* compatibility matrix */
  36 #define LCK_COMPAT_EX  L2B(LCK_NL)
  37 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  38 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  39 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  40 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  41 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  42
  43 static ldlm_mode_t lck_compat_array[] = {
  44         [LCK_EX] LCK_COMPAT_EX,
  45         [LCK_PW] LCK_COMPAT_PW,
  46         [LCK_PR] LCK_COMPAT_PR,
  47         [LCK_CW] LCK_COMPAT_CW,
  48         [LCK_CR] LCK_COMPAT_CR,
  49         [LCK_NL] LCK_COMPAT_NL
  50 };
  51
  52 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
  53 {
  54        if (exist < LCK_EX || exist > LCK_NL)
  55               LBUG();
  56        if (new < LCK_EX || new > LCK_NL)
  57               LBUG();
  58
  59        return (lck_compat_array[exist] & L2B(new));
  60 }
  61
  62 /*
  63  *
  64  * cluster name spaces
  65  *
  66  */
  67
  68 #define DLM_OST_NAMESPACE 1
  69 #define DLM_MDS_NAMESPACE 2
  70
  71 /* XXX
  72    - do we just separate this by security domains and use a prefix for
  73      multiple namespaces in the same domain?
  74    -
  75 */
  76
  77 struct ldlm_namespace {
  78         struct list_head      ns_link;      /* in the list of ns's */
  79         __u32                 ns_id;        /* identifier of ns */
  80         struct list_head     *ns_hash;      /* hash table for ns */
  81         atomic_t              ns_refcount;  /* count of resources in the hash */
  82         struct list_head      ns_root_list; /* all root resources in ns */
  83         struct obd_device    *ns_obddev;
  84 };
  85
  86 /*
  87  *
  88  * Resource hash table
  89  *
  90  */
  91
  92 #define RES_HASH_BITS 14
  93 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
  94 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
  95
  96 struct ldlm_lock;
  97
  98 typedef int (*ldlm_lock_callback)(struct ldlm_lock *lock, struct ldlm_lock *new,
  99                                   void *data, __u32 data_len);
 100
 101 struct ldlm_lock {
 102         struct ldlm_resource *l_resource;
 103         struct ldlm_lock     *l_parent;
 104         struct list_head      l_children;
 105         struct list_head      l_childof;
 106         struct list_head      l_res_link; /*position in one of three res lists*/
 107         ldlm_mode_t           l_req_mode;
 108         ldlm_mode_t           l_granted_mode;
 109         ldlm_lock_callback    l_completion_ast;
 110         ldlm_lock_callback    l_blocking_ast;
 111         struct lustre_peer   *l_peer;
 112         void                 *l_data;
 113         __u32                 l_data_len;
 114         struct ldlm_extent    l_extent;
 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 static inline void ldlm_lock(struct obd_device *obddev)
 173 {
 174         spin_lock(&obddev->u.ldlm.ldlm_lock);
 175 }
 176
 177 static inline void ldlm_unlock(struct obd_device *obddev)
 178 {
 179         spin_unlock(&obddev->u.ldlm.ldlm_lock);
 180 }
 181
 182 extern struct obd_ops ldlm_obd_ops;
 183
 184 /* ldlm_extent.c */
 185 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
 186 int ldlm_extent_policy(struct ldlm_resource *, struct ldlm_extent *,
 187                        struct ldlm_extent *, ldlm_mode_t, void *);
 188
 189 /* ldlm_lock.c */
 190 void ldlm_lock_free(struct ldlm_lock *lock);
 191 ldlm_error_t ldlm_local_lock_enqueue(struct obd_device *obddev,
 192                                      __u32 ns_id,
 193                                      struct ldlm_handle *parent_lock_handle,
 194                                      __u64 *res_id,
 195                                      __u32 type,
 196                                      struct ldlm_extent *req_ex,
 197                                      ldlm_mode_t mode,
 198                                      int *flags,
 199                                      ldlm_lock_callback completion,
 200                                      ldlm_lock_callback blocking,
 201                                      void *data,
 202                                      __u32 data_len,
 203                                      struct ldlm_handle *lockh);
 204 ldlm_error_t ldlm_local_lock_convert(struct obd_device *obddev,
 205                                      struct ldlm_handle *lockh,
 206                                      int new_mode, int *flags);
 207 ldlm_error_t ldlm_local_lock_cancel(struct obd_device *obddev,
 208                                     struct ldlm_handle *lockh);
 209 void ldlm_lock_dump(struct ldlm_lock *lock);
 210
 211 /* ldlm_test.c */
 212 int ldlm_test(struct obd_device *device);
 213
 214 /* resource.c */
 215 struct ldlm_namespace *ldlm_namespace_find(struct obd_device *, __u32 id);
 216 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *, __u32 id);
 217 int ldlm_namespace_free(struct ldlm_namespace *ns);
 218 void ldlm_resource_dump(struct ldlm_resource *res);
 219 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 220                                         struct ldlm_resource *parent,
 221                                         __u64 *name, __u32 type, int create);
 222 int ldlm_resource_put(struct ldlm_resource *res);
 223 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 224                             struct ldlm_lock *lock);
 225 void ldlm_resource_del_lock(struct ldlm_lock *lock);
 226
 227 #endif /* __KERNEL__ */
 228
 229 /* ioctls for trying requests */
 230 #define IOC_LDLM_TYPE                   'f'
 231 #define IOC_LDLM_MIN_NR                 40
 232
 233 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 234 #define IOC_LDLM_MAX_NR                 41
 235
 236 #endif