/*
    drbd_limits.h
    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
  */
  
  /*
   * Our current limitations.
   * Some of them are hard limits,
   * some of them are arbitrary range limits, that make it easier to provide
   * feedback about nonsense settings for certain configurable values.
   */
  
  #ifndef DRBD_LIMITS_H
  #define DRBD_LIMITS_H 1
  
  #define DEBUG_RANGE_CHECK 0
  
  #define DRBD_MINOR_COUNT_MIN 1

  #define DRBD_MINOR_COUNT_MAX 256
  #define DRBD_MINOR_COUNT_DEF 32

  
  #define DRBD_DIALOG_REFRESH_MIN 0
  #define DRBD_DIALOG_REFRESH_MAX 600
  
  /* valid port number */
  #define DRBD_PORT_MIN 1
  #define DRBD_PORT_MAX 0xffff
  
  /* startup { */
    /* if you want more than 3.4 days, disable */
  #define DRBD_WFC_TIMEOUT_MIN 0
  #define DRBD_WFC_TIMEOUT_MAX 300000
  #define DRBD_WFC_TIMEOUT_DEF 0
  
  #define DRBD_DEGR_WFC_TIMEOUT_MIN 0
  #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
  #define DRBD_DEGR_WFC_TIMEOUT_DEF 0
  
  #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
  #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
  #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
  /* }*/
  
  /* net { */
    /* timeout, unit centi seconds

     * more than one minute timeout is not useful */

  #define DRBD_TIMEOUT_MIN 1
  #define DRBD_TIMEOUT_MAX 600
  #define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
  
    /* active connection retries when C_WF_CONNECTION */
  #define DRBD_CONNECT_INT_MIN 1
  #define DRBD_CONNECT_INT_MAX 120
  #define DRBD_CONNECT_INT_DEF 10   /* seconds */
  
    /* keep-alive probes when idle */
  #define DRBD_PING_INT_MIN 1
  #define DRBD_PING_INT_MAX 120
  #define DRBD_PING_INT_DEF 10
  
   /* timeout for the ping packets.*/
  #define DRBD_PING_TIMEO_MIN  1
  #define DRBD_PING_TIMEO_MAX  100
  #define DRBD_PING_TIMEO_DEF  5
  
    /* max number of write requests between write barriers */
  #define DRBD_MAX_EPOCH_SIZE_MIN 1
  #define DRBD_MAX_EPOCH_SIZE_MAX 20000
  #define DRBD_MAX_EPOCH_SIZE_DEF 2048

    /* I don't think that a tcp send buffer of more than 10M is useful */

  #define DRBD_SNDBUF_SIZE_MIN  0
  #define DRBD_SNDBUF_SIZE_MAX  (10<<20)

  #define DRBD_SNDBUF_SIZE_DEF  0

  
  #define DRBD_RCVBUF_SIZE_MIN  0
  #define DRBD_RCVBUF_SIZE_MAX  (10<<20)

  #define DRBD_RCVBUF_SIZE_DEF  0

  
    /* @4k PageSize -> 128kB - 512MB */
  #define DRBD_MAX_BUFFERS_MIN  32
  #define DRBD_MAX_BUFFERS_MAX  131072
  #define DRBD_MAX_BUFFERS_DEF  2048
  
    /* @4k PageSize -> 4kB - 512MB */
  #define DRBD_UNPLUG_WATERMARK_MIN  1
  #define DRBD_UNPLUG_WATERMARK_MAX  131072
  #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
  
    /* 0 is disabled.
     * 200 should be more than enough even for very short timeouts */
  #define DRBD_KO_COUNT_MIN  0
  #define DRBD_KO_COUNT_MAX  200
  #define DRBD_KO_COUNT_DEF  0
  /* } */
  
  /* syncer { */
    /* FIXME allow rate to be zero? */
  #define DRBD_RATE_MIN 1
  /* channel bonding 10 GbE, or other hardware */
  #define DRBD_RATE_MAX (4 << 20)
  #define DRBD_RATE_DEF 250  /* kb/second */

    /* less than 7 would hit performance unnecessarily.

     * 3833 is the largest prime that still does fit
     * into 64 sectors of activity log */
  #define DRBD_AL_EXTENTS_MIN  7
  #define DRBD_AL_EXTENTS_MAX  3833
  #define DRBD_AL_EXTENTS_DEF  127
  
  #define DRBD_AFTER_MIN  -1
  #define DRBD_AFTER_MAX  255
  #define DRBD_AFTER_DEF  -1
  
  /* } */
  
  /* drbdsetup XY resize -d Z
   * you are free to reduce the device size to nothing, if you want to.
   * the upper limit with 64bit kernel, enough ram and flexible meta data

   * is 1 PiB, currently. */

  /* DRBD_MAX_SECTORS */
  #define DRBD_DISK_SIZE_SECT_MIN  0

  #define DRBD_DISK_SIZE_SECT_MAX  (1 * (2LLU << 40))

  #define DRBD_DISK_SIZE_SECT_DEF  0 /* = disabled = no user size... */
  
  #define DRBD_ON_IO_ERROR_DEF EP_PASS_ON
  #define DRBD_FENCING_DEF FP_DONT_CARE
  #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
  #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
  #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
  #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT

  #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR

  #define DRBD_ON_CONGESTION_DEF OC_BLOCK

  
  #define DRBD_MAX_BIO_BVECS_MIN 0
  #define DRBD_MAX_BIO_BVECS_MAX 128
  #define DRBD_MAX_BIO_BVECS_DEF 0

  #define DRBD_C_PLAN_AHEAD_MIN  0
  #define DRBD_C_PLAN_AHEAD_MAX  300
  #define DRBD_C_PLAN_AHEAD_DEF  0 /* RS rate controller disabled by default */

  #define DRBD_C_DELAY_TARGET_MIN 1
  #define DRBD_C_DELAY_TARGET_MAX 100
  #define DRBD_C_DELAY_TARGET_DEF 10

  #define DRBD_C_FILL_TARGET_MIN 0

  #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */

  #define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */

  #define DRBD_C_MAX_RATE_MIN     250 /* kByte/sec */
  #define DRBD_C_MAX_RATE_MAX     (4 << 20)
  #define DRBD_C_MAX_RATE_DEF     102400

  #define DRBD_C_MIN_RATE_MIN     0 /* kByte/sec */
  #define DRBD_C_MIN_RATE_MAX     (4 << 20)
  #define DRBD_C_MIN_RATE_DEF     4096

  #define DRBD_CONG_FILL_MIN	0
  #define DRBD_CONG_FILL_MAX	(10<<21) /* 10GByte in sectors */
  #define DRBD_CONG_FILL_DEF	0
  
  #define DRBD_CONG_EXTENTS_MIN	DRBD_AL_EXTENTS_MIN
  #define DRBD_CONG_EXTENTS_MAX	DRBD_AL_EXTENTS_MAX
  #define DRBD_CONG_EXTENTS_DEF	DRBD_AL_EXTENTS_DEF

  #undef RANGE
  #endif