fs/intermezzo/intermezzo_psdev.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #ifndef __PRESTO_PSDEV_H
   6 #define __PRESTO_PSDEV_H
   7
   8 #define MAX_CHANNEL 16
   9 #define PROCNAME_SIZE 32
  10 #include <linux/smp_lock.h>
  11
  12 /* represents state of an instance reached with /dev/intermezzo */
  13 /* communication pending & processing queues */
  14 struct upc_channel {
  15         unsigned int         uc_seq;
  16         wait_queue_head_t    uc_waitq;    /* Lento wait queue */
  17         struct list_head     uc_pending;
  18         struct list_head     uc_processing;
  19         spinlock_t            uc_lock;
  20         int                  uc_pid;      /* Lento's pid */
  21         int                  uc_hard;     /* allows signals during upcalls */
  22         int                  uc_no_filter;
  23         int                  uc_no_journal;
  24         int                  uc_no_upcall;
  25         int                  uc_timeout;  /* . sec: signals will dequeue upc */
  26         long                 uc_errorval; /* for testing I/O failures */
  27         struct list_head     uc_cache_list;
  28         int                  uc_minor;
  29 };
  30
  31 #define ISLENTO(minor) (current->pid == izo_channels[minor].uc_pid \
  32                 || current->real_parent->pid == izo_channels[minor].uc_pid \
  33                 || current->real_parent->real_parent->pid == izo_channels[minor].uc_pid)
  34
  35 extern struct upc_channel izo_channels[MAX_CHANNEL];
  36
  37 /* message types between presto filesystem in kernel */
  38 #define REQ_READ   1
  39 #define REQ_WRITE  2
  40 #define REQ_ASYNC  4
  41 #define REQ_DEAD   8
  42
  43 struct upc_req {
  44         struct list_head   rq_chain;
  45         caddr_t            rq_data;
  46         int                rq_flags;
  47         int                rq_bufsize;
  48         int                rq_rep_size;
  49         int                rq_opcode;  /* copied from data to save lookup */
  50         int                rq_unique;
  51         wait_queue_head_t  rq_sleep;   /* process' wait queue */
  52         unsigned long      rq_posttime;
  53 };
  54
  55 #endif