^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef __DRBD_PROTOCOL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define __DRBD_PROTOCOL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) enum drbd_packet {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) /* receiver (data socket) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) P_DATA = 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) P_BARRIER = 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) P_BITMAP = 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) P_BECOME_SYNC_TARGET = 0x05,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) P_BECOME_SYNC_SOURCE = 0x06,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) P_DATA_REQUEST = 0x08, /* Used to ask for a data block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) P_SYNC_PARAM = 0x0a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) P_PROTOCOL = 0x0b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) P_UUIDS = 0x0c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) P_SIZES = 0x0d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) P_STATE = 0x0e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) P_SYNC_UUID = 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) P_AUTH_CHALLENGE = 0x10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) P_AUTH_RESPONSE = 0x11,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) P_STATE_CHG_REQ = 0x12,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /* (meta socket) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) P_PING = 0x13,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) P_PING_ACK = 0x14,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) P_RECV_ACK = 0x15, /* Used in protocol B */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) P_WRITE_ACK = 0x16, /* Used in protocol C */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) P_SUPERSEDED = 0x18, /* Used in proto C, two-primaries conflict detection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) P_NEG_ACK = 0x19, /* Sent if local disk is unusable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) P_NEG_DREPLY = 0x1a, /* Local disk is broken... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) P_BARRIER_ACK = 0x1c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) P_STATE_CHG_REPLY = 0x1d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /* "new" commands, no longer fitting into the ordering scheme above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) P_OV_REQUEST = 0x1e, /* data socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) P_OV_REPLY = 0x1f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) P_OV_RESULT = 0x20, /* meta socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) P_CSUM_RS_REQUEST = 0x21, /* data socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) P_RS_IS_IN_SYNC = 0x22, /* meta socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) P_CONN_ST_CHG_REQ = 0x2a, /* data sock: Connection wide state request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) P_CONN_ST_CHG_REPLY = 0x2b, /* meta sock: Connection side state req reply */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) P_RETRY_WRITE = 0x2c, /* Protocol C: retry conflicting write request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) P_PROTOCOL_UPDATE = 0x2d, /* data sock: is used in established connections */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* 0x2e to 0x30 reserved, used in drbd 9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* REQ_OP_DISCARD. We used "discard" in different contexts before,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * which is why I chose TRIM here, to disambiguate. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) P_TRIM = 0x31,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* Only use these two if both support FF_THIN_RESYNC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) P_RS_THIN_REQ = 0x32, /* Request a block for resync or reply P_RS_DEALLOCATED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) P_RS_DEALLOCATED = 0x33, /* Contains only zeros on sync source node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* REQ_WRITE_SAME.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * On a receiving side without REQ_WRITE_SAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * we may fall back to an opencoded loop instead. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) P_WSAME = 0x34,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* 0x35 already claimed in DRBD 9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) P_ZEROES = 0x36, /* data sock: zero-out, WRITE_ZEROES */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* 0x40 .. 0x48 already claimed in DRBD 9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) P_MAX_OPT_CMD = 0x101,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* special command ids for handshake */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) P_INITIAL_META = 0xfff1, /* First Packet on the MetaSock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) P_INITIAL_DATA = 0xfff2, /* First Packet on the Socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) P_CONNECTION_FEATURES = 0xfffe /* FIXED for the next century! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #ifndef __packed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define __packed __attribute__((packed))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* This is the layout for a packet on the wire.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * The byteorder is the network byte order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * (except block_id and barrier fields.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * these are pointers to local structs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * and have no relevance for the partner,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * which just echoes them as received.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * NOTE that the payload starts at a long aligned offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * regardless of 32 or 64 bit arch!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct p_header80 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) u32 magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) u16 command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) u16 length; /* bytes of data after this header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Header for big packets, Used for data packets exceeding 64kB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct p_header95 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) u16 magic; /* use DRBD_MAGIC_BIG here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) u16 command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) u32 length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct p_header100 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) u32 magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) u16 volume;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) u16 command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) u32 length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) u32 pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* These defines must not be changed without changing the protocol version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * New defines may only be introduced together with protocol version bump or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * new protocol feature flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) #define DP_HARDBARRIER 1 /* no longer used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #define DP_RW_SYNC 2 /* equals REQ_SYNC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #define DP_MAY_SET_IN_SYNC 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define DP_UNPLUG 8 /* not used anymore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #define DP_FUA 16 /* equals REQ_FUA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #define DP_FLUSH 32 /* equals REQ_PREFLUSH */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #define DP_DISCARD 64 /* equals REQ_OP_DISCARD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #define DP_SEND_RECEIVE_ACK 128 /* This is a proto B write request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #define DP_SEND_WRITE_ACK 256 /* This is a proto C write request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #define DP_WSAME 512 /* equiv. REQ_WRITE_SAME */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #define DP_ZEROES 1024 /* equiv. REQ_OP_WRITE_ZEROES */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* possible combinations:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * REQ_OP_WRITE_ZEROES: DP_DISCARD | DP_ZEROES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * REQ_OP_WRITE_ZEROES + REQ_NOUNMAP: DP_ZEROES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct p_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) u64 sector; /* 64 bits sector number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) u64 block_id; /* to identify the request in protocol B&C */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) u32 seq_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) u32 dp_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct p_trim {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct p_data p_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) u32 size; /* == bio->bi_size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct p_wsame {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct p_data p_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) u32 size; /* == bio->bi_size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * commands which share a struct:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * p_block_ack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * P_RECV_ACK (proto B), P_WRITE_ACK (proto C),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * P_SUPERSEDED (proto C, two-primaries conflict detection)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * p_block_req:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * P_DATA_REQUEST, P_RS_DATA_REQUEST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct p_block_ack {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) u64 sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) u64 block_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) u32 blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) u32 seq_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct p_block_req {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) u64 sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) u64 block_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) u32 blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) u32 pad; /* to multiple of 8 Byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * commands with their own struct for additional fields:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * P_CONNECTION_FEATURES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * P_BARRIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * P_BARRIER_ACK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * P_SYNC_PARAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * ReportParams
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* supports TRIM/DISCARD on the "wire" protocol */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define DRBD_FF_TRIM 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /* Detect all-zeros during resync, and rather TRIM/UNMAP/DISCARD those blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * instead of fully allocate a supposedly thin volume on initial resync */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #define DRBD_FF_THIN_RESYNC 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* supports REQ_WRITE_SAME on the "wire" protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Note: this flag is overloaded,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * its presence also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * - indicates support for 128 MiB "batch bios",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * max discard size of 128 MiB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * instead of 4M before that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * - indicates that we exchange additional settings in p_sizes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * drbd_send_sizes()/receive_sizes()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) #define DRBD_FF_WSAME 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* supports REQ_OP_WRITE_ZEROES on the "wire" protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * We used to map that to "discard" on the sending side, and if we cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * guarantee that discard zeroes data, the receiving side would map discard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * back to zero-out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * With the introduction of REQ_OP_WRITE_ZEROES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * we started to use that for both WRITE_ZEROES and DISCARDS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * hoping that WRITE_ZEROES would "do what we want",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * UNMAP if possible, zero-out the rest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * The example scenario is some LVM "thin" backend.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * While an un-allocated block on dm-thin reads as zeroes, on a dm-thin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * with "skip_block_zeroing=true", after a partial block write allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * that block, that same block may well map "undefined old garbage" from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * the backends on LBAs that have not yet been written to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * If we cannot distinguish between zero-out and discard on the receiving
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * side, to avoid "undefined old garbage" to pop up randomly at later times
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * on supposedly zero-initialized blocks, we'd need to map all discards to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * zero-out on the receiving side. But that would potentially do a full
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * alloc on thinly provisioned backends, even when the expectation was to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * unmap/trim/discard/de-allocate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * We need to distinguish on the protocol level, whether we need to guarantee
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * zeroes (and thus use zero-out, potentially doing the mentioned full-alloc),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * or if we want to put the emphasis on discard, and only do a "best effort
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * zeroing" (by "discarding" blocks aligned to discard-granularity, and zeroing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * only potential unaligned head and tail clippings), to at least *try* to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * avoid "false positives" in an online-verify later, hoping that someone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * set skip_block_zeroing=false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) #define DRBD_FF_WZEROES 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct p_connection_features {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) u32 protocol_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) u32 feature_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) u32 protocol_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* should be more than enough for future enhancements
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * for now, feature_flags and the reserved array shall be zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) u32 _pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) u64 reserved[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct p_barrier {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) u32 barrier; /* barrier number _handle_ only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) u32 pad; /* to multiple of 8 Byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct p_barrier_ack {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) u32 barrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) u32 set_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct p_rs_param {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) u32 resync_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /* Since protocol version 88 and higher. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) char verify_alg[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct p_rs_param_89 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) u32 resync_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* protocol version 89: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) char verify_alg[SHARED_SECRET_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) char csums_alg[SHARED_SECRET_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) struct p_rs_param_95 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) u32 resync_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) char verify_alg[SHARED_SECRET_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) char csums_alg[SHARED_SECRET_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) u32 c_plan_ahead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) u32 c_delay_target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) u32 c_fill_target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) u32 c_max_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) enum drbd_conn_flags {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) CF_DISCARD_MY_DATA = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) CF_DRY_RUN = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct p_protocol {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) u32 protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) u32 after_sb_0p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) u32 after_sb_1p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) u32 after_sb_2p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) u32 conn_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) u32 two_primaries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) /* Since protocol version 87 and higher. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) char integrity_alg[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct p_uuids {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) u64 uuid[UI_EXTENDED_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) struct p_rs_uuid {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) u64 uuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) /* optional queue_limits if (agreed_features & DRBD_FF_WSAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) * see also struct queue_limits, as of late 2015 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct o_qlim {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /* we don't need it yet, but we may as well communicate it now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) u32 physical_block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /* so the original in struct queue_limits is unsigned short,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * but I'd have to put in padding anyways. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) u32 logical_block_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /* One incoming bio becomes one DRBD request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * which may be translated to several bio on the receiving side.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * We don't need to communicate chunk/boundary/segment ... limits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* various IO hints may be useful with "diskless client" setups */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) u32 alignment_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) u32 io_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) u32 io_opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /* We may need to communicate integrity stuff at some point,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * but let's not get ahead of ourselves. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* Backend discard capabilities.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * Receiving side uses "blkdev_issue_discard()", no need to communicate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * more specifics. If the backend cannot do discards, the DRBD peer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * may fall back to blkdev_issue_zeroout().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) u8 discard_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) u8 discard_zeroes_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) u8 write_same_capable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) u8 _pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct p_sizes {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) u64 d_size; /* size of disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) u64 u_size; /* user requested size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) u64 c_size; /* current exported size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) u32 max_bio_size; /* Maximal size of a BIO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) u16 queue_order_type; /* not yet implemented in DRBD*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) u16 dds_flags; /* use enum dds_flags here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* optional queue_limits if (agreed_features & DRBD_FF_WSAME) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct o_qlim qlim[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct p_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) u32 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct p_req_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct p_req_state_reply {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) u32 retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct p_drbd06_param {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) u64 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) u32 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) u32 blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) u32 protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) u32 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) u32 gen_cnt[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) u32 bit_map_gen[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct p_block_desc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) u64 sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) u32 blksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) u32 pad; /* to multiple of 8 Byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) /* Valid values for the encoding field.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) * Bump proto version when changing this. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) enum drbd_bitmap_code {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* RLE_VLI_Bytes = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * and other bit variants had been defined during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * algorithm evaluation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) RLE_VLI_Bits = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct p_compressed_bm {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * (encoding & 0x80): polarity (set/unset) of first runlength
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * used to pad up to head.length bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) u8 encoding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) u8 code[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) struct p_delay_probe93 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) u32 seq_num; /* sequence number to match the two probe packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) u32 offset; /* usecs the probe got sent after the reference time point */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * Bitmap packets need to fit within a single page on the sender and receiver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * so we are limited to 4 KiB (and not to PAGE_SIZE, which can be bigger).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) #define DRBD_SOCKET_BUFFER_SIZE 4096
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) #endif /* __DRBD_PROTOCOL_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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