drivers/staging/zram/zram_ioctl.h

   1 /*
   2  * Compressed RAM based swap device
   3  *
   4  * Copyright (C) 2008, 2009, 2010  Nitin Gupta
   5  *
   6  * This code is released using a dual license strategy: BSD/GPL
   7  * You can choose the licence that better fits your requirements.
   8  *
   9  * Released under the terms of 3-clause BSD License
  10  * Released under the terms of GNU General Public License Version 2.0
  11  *
  12  * Project home: http://compcache.googlecode.com
  13  */
  14
  15 #ifndef _RAMZSWAP_IOCTL_H_
  16 #define _RAMZSWAP_IOCTL_H_
  17
  18 struct ramzswap_ioctl_stats {
  19         u64 disksize;           /* user specified or equal to backing swap
  20                                  * size (if present) */
  21         u64 num_reads;          /* failed + successful */
  22         u64 num_writes;         /* --do-- */
  23         u64 failed_reads;       /* should NEVER! happen */
  24         u64 failed_writes;      /* can happen when memory is too low */
  25         u64 invalid_io;         /* non-swap I/O requests */
  26         u64 notify_free;        /* no. of swap slot free notifications */
  27         u32 pages_zero;         /* no. of zero filled pages */
  28         u32 good_compress_pct;  /* no. of pages with compression ratio<=50% */
  29         u32 pages_expand_pct;   /* no. of incompressible pages */
  30         u32 pages_stored;
  31         u32 pages_used;
  32         u64 orig_data_size;
  33         u64 compr_data_size;
  34         u64 mem_used_total;
  35 } __attribute__ ((packed, aligned(4)));
  36
  37 #define RZSIO_SET_DISKSIZE_KB   _IOW('z', 0, size_t)
  38 #define RZSIO_GET_STATS         _IOR('z', 1, struct ramzswap_ioctl_stats)
  39 #define RZSIO_INIT              _IO('z', 2)
  40 #define RZSIO_RESET             _IO('z', 3)
  41
  42 #endif