/* 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 … #define DEBUG_RANGE_CHECK … #define DRBD_MINOR_COUNT_MIN … #define DRBD_MINOR_COUNT_MAX … #define DRBD_MINOR_COUNT_DEF … #define DRBD_MINOR_COUNT_SCALE … #define DRBD_VOLUME_MAX … #define DRBD_DIALOG_REFRESH_MIN … #define DRBD_DIALOG_REFRESH_MAX … #define DRBD_DIALOG_REFRESH_SCALE … /* valid port number */ #define DRBD_PORT_MIN … #define DRBD_PORT_MAX … #define DRBD_PORT_SCALE … /* startup { */ /* if you want more than 3.4 days, disable */ #define DRBD_WFC_TIMEOUT_MIN … #define DRBD_WFC_TIMEOUT_MAX … #define DRBD_WFC_TIMEOUT_DEF … #define DRBD_WFC_TIMEOUT_SCALE … #define DRBD_DEGR_WFC_TIMEOUT_MIN … #define DRBD_DEGR_WFC_TIMEOUT_MAX … #define DRBD_DEGR_WFC_TIMEOUT_DEF … #define DRBD_DEGR_WFC_TIMEOUT_SCALE … #define DRBD_OUTDATED_WFC_TIMEOUT_MIN … #define DRBD_OUTDATED_WFC_TIMEOUT_MAX … #define DRBD_OUTDATED_WFC_TIMEOUT_DEF … #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE … /* }*/ /* net { */ /* timeout, unit centi seconds * more than one minute timeout is not useful */ #define DRBD_TIMEOUT_MIN … #define DRBD_TIMEOUT_MAX … #define DRBD_TIMEOUT_DEF … #define DRBD_TIMEOUT_SCALE … /* If backing disk takes longer than disk_timeout, mark the disk as failed */ #define DRBD_DISK_TIMEOUT_MIN … #define DRBD_DISK_TIMEOUT_MAX … #define DRBD_DISK_TIMEOUT_DEF … #define DRBD_DISK_TIMEOUT_SCALE … /* active connection retries when C_WF_CONNECTION */ #define DRBD_CONNECT_INT_MIN … #define DRBD_CONNECT_INT_MAX … #define DRBD_CONNECT_INT_DEF … #define DRBD_CONNECT_INT_SCALE … /* keep-alive probes when idle */ #define DRBD_PING_INT_MIN … #define DRBD_PING_INT_MAX … #define DRBD_PING_INT_DEF … #define DRBD_PING_INT_SCALE … /* timeout for the ping packets.*/ #define DRBD_PING_TIMEO_MIN … #define DRBD_PING_TIMEO_MAX … #define DRBD_PING_TIMEO_DEF … #define DRBD_PING_TIMEO_SCALE … /* max number of write requests between write barriers */ #define DRBD_MAX_EPOCH_SIZE_MIN … #define DRBD_MAX_EPOCH_SIZE_MAX … #define DRBD_MAX_EPOCH_SIZE_DEF … #define DRBD_MAX_EPOCH_SIZE_SCALE … /* I don't think that a tcp send buffer of more than 10M is useful */ #define DRBD_SNDBUF_SIZE_MIN … #define DRBD_SNDBUF_SIZE_MAX … #define DRBD_SNDBUF_SIZE_DEF … #define DRBD_SNDBUF_SIZE_SCALE … #define DRBD_RCVBUF_SIZE_MIN … #define DRBD_RCVBUF_SIZE_MAX … #define DRBD_RCVBUF_SIZE_DEF … #define DRBD_RCVBUF_SIZE_SCALE … /* @4k PageSize -> 128kB - 512MB */ #define DRBD_MAX_BUFFERS_MIN … #define DRBD_MAX_BUFFERS_MAX … #define DRBD_MAX_BUFFERS_DEF … #define DRBD_MAX_BUFFERS_SCALE … /* @4k PageSize -> 4kB - 512MB */ #define DRBD_UNPLUG_WATERMARK_MIN … #define DRBD_UNPLUG_WATERMARK_MAX … #define DRBD_UNPLUG_WATERMARK_DEF … #define DRBD_UNPLUG_WATERMARK_SCALE … /* 0 is disabled. * 200 should be more than enough even for very short timeouts */ #define DRBD_KO_COUNT_MIN … #define DRBD_KO_COUNT_MAX … #define DRBD_KO_COUNT_DEF … #define DRBD_KO_COUNT_SCALE … /* } */ /* syncer { */ /* FIXME allow rate to be zero? */ #define DRBD_RESYNC_RATE_MIN … /* channel bonding 10 GbE, or other hardware */ #define DRBD_RESYNC_RATE_MAX … #define DRBD_RESYNC_RATE_DEF … #define DRBD_RESYNC_RATE_SCALE … #define DRBD_AL_EXTENTS_MIN … /* 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 … #define DRBD_AL_EXTENTS_DEF … #define DRBD_AL_EXTENTS_SCALE … #define DRBD_MINOR_NUMBER_MIN … #define DRBD_MINOR_NUMBER_MAX … #define DRBD_MINOR_NUMBER_DEF … #define DRBD_MINOR_NUMBER_SCALE … /* } */ /* 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 … #define DRBD_DISK_SIZE_MAX … #define DRBD_DISK_SIZE_DEF … #define DRBD_DISK_SIZE_SCALE … #define DRBD_ON_IO_ERROR_DEF … #define DRBD_FENCING_DEF … #define DRBD_AFTER_SB_0P_DEF … #define DRBD_AFTER_SB_1P_DEF … #define DRBD_AFTER_SB_2P_DEF … #define DRBD_RR_CONFLICT_DEF … #define DRBD_ON_NO_DATA_DEF … #define DRBD_ON_CONGESTION_DEF … #define DRBD_READ_BALANCING_DEF … #define DRBD_MAX_BIO_BVECS_MIN … #define DRBD_MAX_BIO_BVECS_MAX … #define DRBD_MAX_BIO_BVECS_DEF … #define DRBD_MAX_BIO_BVECS_SCALE … #define DRBD_C_PLAN_AHEAD_MIN … #define DRBD_C_PLAN_AHEAD_MAX … #define DRBD_C_PLAN_AHEAD_DEF … #define DRBD_C_PLAN_AHEAD_SCALE … #define DRBD_C_DELAY_TARGET_MIN … #define DRBD_C_DELAY_TARGET_MAX … #define DRBD_C_DELAY_TARGET_DEF … #define DRBD_C_DELAY_TARGET_SCALE … #define DRBD_C_FILL_TARGET_MIN … #define DRBD_C_FILL_TARGET_MAX … #define DRBD_C_FILL_TARGET_DEF … #define DRBD_C_FILL_TARGET_SCALE … #define DRBD_C_MAX_RATE_MIN … #define DRBD_C_MAX_RATE_MAX … #define DRBD_C_MAX_RATE_DEF … #define DRBD_C_MAX_RATE_SCALE … #define DRBD_C_MIN_RATE_MIN … #define DRBD_C_MIN_RATE_MAX … #define DRBD_C_MIN_RATE_DEF … #define DRBD_C_MIN_RATE_SCALE … #define DRBD_CONG_FILL_MIN … #define DRBD_CONG_FILL_MAX … #define DRBD_CONG_FILL_DEF … #define DRBD_CONG_FILL_SCALE … #define DRBD_CONG_EXTENTS_MIN … #define DRBD_CONG_EXTENTS_MAX … #define DRBD_CONG_EXTENTS_DEF … #define DRBD_CONG_EXTENTS_SCALE … #define DRBD_PROTOCOL_DEF … #define DRBD_DISK_BARRIER_DEF … #define DRBD_DISK_FLUSHES_DEF … #define DRBD_DISK_DRAIN_DEF … #define DRBD_MD_FLUSHES_DEF … #define DRBD_TCP_CORK_DEF … #define DRBD_AL_UPDATES_DEF … /* 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 … /* 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 … #define DRBD_ALLOW_TWO_PRIMARIES_DEF … #define DRBD_ALWAYS_ASBP_DEF … #define DRBD_USE_RLE_DEF … #define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF … #define DRBD_AL_STRIPES_MIN … #define DRBD_AL_STRIPES_MAX … #define DRBD_AL_STRIPES_DEF … #define DRBD_AL_STRIPES_SCALE … #define DRBD_AL_STRIPE_SIZE_MIN … #define DRBD_AL_STRIPE_SIZE_MAX … #define DRBD_AL_STRIPE_SIZE_DEF … #define DRBD_AL_STRIPE_SIZE_SCALE … #define DRBD_SOCKET_CHECK_TIMEO_MIN … #define DRBD_SOCKET_CHECK_TIMEO_MAX … #define DRBD_SOCKET_CHECK_TIMEO_DEF … #define DRBD_SOCKET_CHECK_TIMEO_SCALE … #define DRBD_RS_DISCARD_GRANULARITY_MIN … #define DRBD_RS_DISCARD_GRANULARITY_MAX … #define DRBD_RS_DISCARD_GRANULARITY_DEF … #define DRBD_RS_DISCARD_GRANULARITY_SCALE … #endif
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