include/linux/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/locks.h>
  11 #include <linux/smp_lock.h>
  12 #include <linux/version.h>
  13
  14 /* represents state of an instance reached with /dev/intermezzo */
  15 /* communication pending & processing queues */
  16 struct upc_channel {
  17         unsigned int         uc_seq;
  18         wait_queue_head_t    uc_waitq;    /* Lento wait queue */
  19         struct list_head     uc_pending;
  20         struct list_head     uc_processing;
  21         spinlock_t            uc_lock;
  22         int                  uc_pid;      /* Lento's pid */
  23         int                  uc_hard;     /* allows signals during upcalls */
  24         int                  uc_no_filter;
  25         int                  uc_no_journal;
  26         int                  uc_no_upcall;
  27         int                  uc_timeout;  /* . sec: signals will dequeue upc */
  28         long                 uc_errorval; /* for testing I/O failures */
  29         struct list_head     uc_cache_list;
  30         int                  uc_minor;
  31 };
  32
  33 #define ISLENTO(minor) (current->pid == izo_channels[minor].uc_pid \
  34                 || current->p_pptr->pid == izo_channels[minor].uc_pid \
  35                 || current->p_pptr->p_pptr->pid == izo_channels[minor].uc_pid)
  36
  37 extern struct upc_channel izo_channels[MAX_CHANNEL];
  38
  39 /* message types between presto filesystem in kernel */
  40 #define REQ_READ   1
  41 #define REQ_WRITE  2
  42 #define REQ_ASYNC  4
  43 #define REQ_DEAD   8
  44
  45 struct upc_req {
  46         struct list_head   rq_chain;
  47         caddr_t            rq_data;
  48         int                rq_flags;
  49         int                rq_bufsize;
  50         int                rq_rep_size;
  51         int                rq_opcode;  /* copied from data to save lookup */
  52         int                rq_unique;
  53         wait_queue_head_t  rq_sleep;   /* process' wait queue */
  54         unsigned long      rq_posttime;
  55 };
  56
  57 #endif