cp/include/spool.h

   1 /*
   2  * (C) Copyright 2007-2011  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #ifndef __SPOOL_H
   9 #define __SPOOL_H
  10
  11 #include <list.h>
  12 #include <mutex.h>
  13
  14 struct spool_rec {
  15         u16 len;
  16         u8 data[0];
  17 };
  18
  19 #define SPOOL_DATA_SIZE         (PAGE_SIZE - sizeof(struct list_head))
  20 struct spool_page {
  21         struct list_head list;
  22         u8 data[SPOOL_DATA_SIZE];
  23 };
  24
  25 struct spool_file {
  26         mutex_t lock;
  27         struct list_head list;
  28         u64 recs;
  29         u64 pages;
  30         u16 frecoff;    /* start of the first record,
  31                            offset into first page's data */
  32         u16 lrecoff;    /* end of the last record,
  33                            offset into last page's data */
  34 };
  35
  36 extern struct spool_file *alloc_spool();
  37 extern void free_spool(struct spool_file *f);
  38 extern u64 spool_nrecs(struct spool_file *f);
  39 extern int spool_grab_rec(struct spool_file *f, u8 *buf, u16 *len);
  40 extern int spool_append_rec(struct spool_file *f, u8 *buf, u16 len);
  41
  42 #endif