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/* SPDX-License-Identifier: GPL-2.0-only */
/*
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 1U
#define DRBD_MINOR_COUNT_MAX 255U
#define DRBD_MINOR_COUNT_DEF 32U
#define DRBD_MINOR_COUNT_SCALE '1'
#define DRBD_VOLUME_MAX 65534U
#define DRBD_DIALOG_REFRESH_MIN 0U
#define DRBD_DIALOG_REFRESH_MAX 600U
#define DRBD_DIALOG_REFRESH_SCALE '1'
/* valid port number */
#define DRBD_PORT_MIN 1U
#define DRBD_PORT_MAX 0xffffU
#define DRBD_PORT_SCALE '1'
/* startup { */
/* if you want more than 3.4 days, disable */
#define DRBD_WFC_TIMEOUT_MIN 0U
#define DRBD_WFC_TIMEOUT_MAX 300000U
#define DRBD_WFC_TIMEOUT_DEF 0U
#define DRBD_WFC_TIMEOUT_SCALE '1'
#define DRBD_DEGR_WFC_TIMEOUT_MIN 0U
#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000U
#define DRBD_DEGR_WFC_TIMEOUT_DEF 0U
#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0U
#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000U
#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0U
#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
/* }*/
/* net { */
/* timeout, unit centi seconds
* more than one minute timeout is not useful */
#define DRBD_TIMEOUT_MIN 1U
#define DRBD_TIMEOUT_MAX 600U
#define DRBD_TIMEOUT_DEF 60U /* 6 seconds */
#define DRBD_TIMEOUT_SCALE '1'
/* If backing disk takes longer than disk_timeout, mark the disk as failed */
#define DRBD_DISK_TIMEOUT_MIN 0U /* 0 = disabled */
#define DRBD_DISK_TIMEOUT_MAX 6000U /* 10 Minutes */
#define DRBD_DISK_TIMEOUT_DEF 0U /* disabled */
#define DRBD_DISK_TIMEOUT_SCALE '1'
/* active connection retries when C_WF_CONNECTION */
#define DRBD_CONNECT_INT_MIN 1U
#define DRBD_CONNECT_INT_MAX 120U
#define DRBD_CONNECT_INT_DEF 10U /* seconds */
#define DRBD_CONNECT_INT_SCALE '1'
/* keep-alive probes when idle */
#define DRBD_PING_INT_MIN 1U
#define DRBD_PING_INT_MAX 120U
#define DRBD_PING_INT_DEF 10U
#define DRBD_PING_INT_SCALE '1'
/* timeout for the ping packets.*/
#define DRBD_PING_TIMEO_MIN 1U
#define DRBD_PING_TIMEO_MAX 300U
#define DRBD_PING_TIMEO_DEF 5U
#define DRBD_PING_TIMEO_SCALE '1'
/* max number of write requests between write barriers */
#define DRBD_MAX_EPOCH_SIZE_MIN 1U
#define DRBD_MAX_EPOCH_SIZE_MAX 20000U
#define DRBD_MAX_EPOCH_SIZE_DEF 2048U
#define DRBD_MAX_EPOCH_SIZE_SCALE '1'
/* I don't think that a tcp send buffer of more than 10M is useful */
#define DRBD_SNDBUF_SIZE_MIN 0U
#define DRBD_SNDBUF_SIZE_MAX (10U<<20)
#define DRBD_SNDBUF_SIZE_DEF 0U
#define DRBD_SNDBUF_SIZE_SCALE '1'
#define DRBD_RCVBUF_SIZE_MIN 0U
#define DRBD_RCVBUF_SIZE_MAX (10U<<20)
#define DRBD_RCVBUF_SIZE_DEF 0U
#define DRBD_RCVBUF_SIZE_SCALE '1'
/* @4k PageSize -> 128kB - 512MB */
#define DRBD_MAX_BUFFERS_MIN 32U
#define DRBD_MAX_BUFFERS_MAX 131072U
#define DRBD_MAX_BUFFERS_DEF 2048U
#define DRBD_MAX_BUFFERS_SCALE '1'
/* @4k PageSize -> 4kB - 512MB */
#define DRBD_UNPLUG_WATERMARK_MIN 1U
#define DRBD_UNPLUG_WATERMARK_MAX 131072U
#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
#define DRBD_UNPLUG_WATERMARK_SCALE '1'
/* 0 is disabled.
* 200 should be more than enough even for very short timeouts */
#define DRBD_KO_COUNT_MIN 0U
#define DRBD_KO_COUNT_MAX 200U
#define DRBD_KO_COUNT_DEF 7U
#define DRBD_KO_COUNT_SCALE '1'
/* } */
/* syncer { */
/* FIXME allow rate to be zero? */
#define DRBD_RESYNC_RATE_MIN 1U
/* channel bonding 10 GbE, or other hardware */
#define DRBD_RESYNC_RATE_MAX (4 << 20)
#define DRBD_RESYNC_RATE_DEF 250U
#define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */
#define DRBD_AL_EXTENTS_MIN 67U
/* we use u16 as "slot number", (u16)~0 is "FREE".
* If you use >= 292 kB on-disk ring buffer,
* this is the maximum you can use: */
#define DRBD_AL_EXTENTS_MAX 0xfffeU
#define DRBD_AL_EXTENTS_DEF 1237U
#define DRBD_AL_EXTENTS_SCALE '1'
#define DRBD_MINOR_NUMBER_MIN -1
#define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1)
#define DRBD_MINOR_NUMBER_DEF -1
#define DRBD_MINOR_NUMBER_SCALE '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_MIN 0LLU
#define DRBD_DISK_SIZE_MAX (1LLU * (2LLU << 40))
#define DRBD_DISK_SIZE_DEF 0LLU /* = disabled = no user size... */
#define DRBD_DISK_SIZE_SCALE 's' /* sectors */
#define DRBD_ON_IO_ERROR_DEF EP_DETACH
#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_READ_BALANCING_DEF RB_PREFER_LOCAL
#define DRBD_MAX_BIO_BVECS_MIN 0U
#define DRBD_MAX_BIO_BVECS_MAX 128U
#define DRBD_MAX_BIO_BVECS_DEF 0U
#define DRBD_MAX_BIO_BVECS_SCALE '1'
#define DRBD_C_PLAN_AHEAD_MIN 0U
#define DRBD_C_PLAN_AHEAD_MAX 300U
#define DRBD_C_PLAN_AHEAD_DEF 20U
#define DRBD_C_PLAN_AHEAD_SCALE '1'
#define DRBD_C_DELAY_TARGET_MIN 1U
#define DRBD_C_DELAY_TARGET_MAX 100U
#define DRBD_C_DELAY_TARGET_DEF 10U
#define DRBD_C_DELAY_TARGET_SCALE '1'
#define DRBD_C_FILL_TARGET_MIN 0U
#define DRBD_C_FILL_TARGET_MAX (1U<<20) /* 500MByte in sec */
#define DRBD_C_FILL_TARGET_DEF 100U /* Try to place 50KiB in socket send buffer during resync */
#define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */
#define DRBD_C_MAX_RATE_MIN 250U
#define DRBD_C_MAX_RATE_MAX (4U << 20)
#define DRBD_C_MAX_RATE_DEF 102400U
#define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */
#define DRBD_C_MIN_RATE_MIN 0U
#define DRBD_C_MIN_RATE_MAX (4U << 20)
#define DRBD_C_MIN_RATE_DEF 250U
#define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */
#define DRBD_CONG_FILL_MIN 0U
#define DRBD_CONG_FILL_MAX (10U<<21) /* 10GByte in sectors */
#define DRBD_CONG_FILL_DEF 0U
#define DRBD_CONG_FILL_SCALE 's' /* sectors */
#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
#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE
#define DRBD_PROTOCOL_DEF DRBD_PROT_C
#define DRBD_DISK_BARRIER_DEF 0U
#define DRBD_DISK_FLUSHES_DEF 1U
#define DRBD_DISK_DRAIN_DEF 1U
#define DRBD_MD_FLUSHES_DEF 1U
#define DRBD_TCP_CORK_DEF 1U
#define DRBD_AL_UPDATES_DEF 1U
/* We used to ignore the discard_zeroes_data setting.
* To not change established (and expected) behaviour,
* by default assume that, for discard_zeroes_data=0,
* we can make that an effective discard_zeroes_data=1,
* if we only explicitly zero-out unaligned partial chunks. */
#define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1U
/* Some backends pretend to support WRITE SAME,
* but fail such requests when they are actually submitted.
* This is to tell DRBD to not even try. */
#define DRBD_DISABLE_WRITE_SAME_DEF 0U
#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0U
#define DRBD_ALWAYS_ASBP_DEF 0U
#define DRBD_USE_RLE_DEF 1U
#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0U
#define DRBD_AL_STRIPES_MIN 1U
#define DRBD_AL_STRIPES_MAX 1024U
#define DRBD_AL_STRIPES_DEF 1U
#define DRBD_AL_STRIPES_SCALE '1'
#define DRBD_AL_STRIPE_SIZE_MIN 4U
#define DRBD_AL_STRIPE_SIZE_MAX 16777216U
#define DRBD_AL_STRIPE_SIZE_DEF 32U
#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
#define DRBD_SOCKET_CHECK_TIMEO_MIN 0U
#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
#define DRBD_SOCKET_CHECK_TIMEO_DEF 0U
#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'
#define DRBD_RS_DISCARD_GRANULARITY_MIN 0U
#define DRBD_RS_DISCARD_GRANULARITY_MAX (1U<<20) /* 1MiByte */
#define DRBD_RS_DISCARD_GRANULARITY_DEF 0U /* disabled by default */
#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */
#endif