lustre/include/lustre_ucache.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #ifndef _UPCALL_CACHE_H
   6 #define _UPCALL_CACHE_H
   7
   8 #define UC_CACHE_NEW            0x01
   9 #define UC_CACHE_ACQUIRING      0x02
  10 #define UC_CACHE_INVALID        0x04
  11 #define UC_CACHE_EXPIRED        0x08
  12
  13 #define UC_CACHE_IS_NEW(i)          ((i)->ue_flags & UC_CACHE_NEW)
  14 #define UC_CACHE_IS_INVALID(i)      ((i)->ue_flags & UC_CACHE_INVALID)
  15 #define UC_CACHE_IS_ACQUIRING(i)    ((i)->ue_flags & UC_CACHE_ACQUIRING)
  16 #define UC_CACHE_IS_EXPIRED(i)      ((i)->ue_flags & UC_CACHE_EXPIRED)
  17 #define UC_CACHE_IS_VALID(i)        ((i)->ue_flags == 0)
  18
  19 #define UC_CACHE_SET_NEW(i)         (i)->ue_flags |= UC_CACHE_NEW
  20 #define UC_CACHE_SET_INVALID(i)     (i)->ue_flags |= UC_CACHE_INVALID
  21 #define UC_CACHE_SET_ACQUIRING(i)   (i)->ue_flags |= UC_CACHE_ACQUIRING
  22 #define UC_CACHE_SET_EXPIRED(i)     (i)->ue_flags |= UC_CACHE_EXPIRED
  23 #define UC_CACHE_SET_VALID(i)       (i)->ue_flags = 0
  24
  25 #define UC_CACHE_CLEAR_NEW(i)       (i)->ue_flags &= ~UC_CACHE_NEW
  26 #define UC_CACHE_CLEAR_ACQUIRING(i) (i)->ue_flags &= ~UC_CACHE_ACQUIRING
  27 #define UC_CACHE_CLEAR_INVALID(i)   (i)->ue_flags &= ~UC_CACHE_INVALID
  28 #define UC_CACHE_CLEAR_EXPIRED(i)   (i)->ue_flags &= ~UC_CACHE_EXPIRED
  29
  30 struct upcall_cache_entry {
  31         struct list_head        ue_hash;
  32         __u64                   ue_key;
  33         __u64                   ue_primary;
  34         struct group_info      *ue_group_info;
  35         atomic_t                ue_refcount;
  36         int                     ue_flags;
  37         cfs_waitq_t             ue_waitq;
  38         cfs_time_t              ue_acquire_expire;
  39         cfs_time_t              ue_expire;
  40 };
  41
  42 #define UC_CACHE_HASH_SIZE        (128)
  43 #define UC_CACHE_HASH_INDEX(id)   ((id) & (UC_CACHE_HASH_SIZE - 1))
  44 #define UC_CACHE_UPCALL_MAXPATH   (1024UL)
  45
  46 struct upcall_cache {
  47         struct list_head        uc_hashtable[UC_CACHE_HASH_SIZE];
  48         spinlock_t              uc_lock;
  49
  50         char                    uc_name[40];            /* for upcall */
  51         char                    uc_upcall[UC_CACHE_UPCALL_MAXPATH];
  52         cfs_time_t              uc_acquire_expire;      /* jiffies */
  53         cfs_time_t              uc_entry_expire;        /* jiffies */
  54 };
  55
  56 struct upcall_cache_entry *upcall_cache_get_entry(struct upcall_cache *hash,
  57                                                   __u64 key, __u32 primary,
  58                                                   __u32 ngroups, __u32 *groups);
  59 void upcall_cache_put_entry(struct upcall_cache *hash,
  60                             struct upcall_cache_entry *entry);
  61 int upcall_cache_downcall(struct upcall_cache *hash, __u32 err, __u64 key,
  62                           __u32 primary, __u32 ngroups, __u32 *groups);
  63 void upcall_cache_flush_idle(struct upcall_cache *cache);
  64 void upcall_cache_flush_all(struct upcall_cache *cache);
  65 struct upcall_cache *upcall_cache_init(const char *name);
  66 void upcall_cache_cleanup(struct upcall_cache *hash);
  67
  68 #endif /* _UPCALL_CACHE_H */