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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/* * 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 _UAPI_LINUX_DRBD_LIMITS_H#define _UAPI_LINUX_DRBD_LIMITS_H
#include <linux/drbd.h>
#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 /* _UAPI_LINUX_DRBD_LIMITS_H */