| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andreas Gruenbacher | 747 | 84.03% | 1 | 9.09% |
| Lars Ellenberg | 123 | 13.84% | 4 | 36.36% |
| Philipp Reisner | 15 | 1.69% | 3 | 27.27% |
| Bart Van Assche | 2 | 0.22% | 1 | 9.09% |
| Michael Christie | 1 | 0.11% | 1 | 9.09% |
| Greg Kroah-Hartman | 1 | 0.11% | 1 | 9.09% |
| Total | 889 | 11 |
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __DRBD_PROTOCOL_H #define __DRBD_PROTOCOL_H enum drbd_packet { /* receiver (data socket) */ P_DATA = 0x00, P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */ P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */ P_BARRIER = 0x03, P_BITMAP = 0x04, P_BECOME_SYNC_TARGET = 0x05, P_BECOME_SYNC_SOURCE = 0x06, P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */ P_DATA_REQUEST = 0x08, /* Used to ask for a data block */ P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */ P_SYNC_PARAM = 0x0a, P_PROTOCOL = 0x0b, P_UUIDS = 0x0c, P_SIZES = 0x0d, P_STATE = 0x0e, P_SYNC_UUID = 0x0f, P_AUTH_CHALLENGE = 0x10, P_AUTH_RESPONSE = 0x11, P_STATE_CHG_REQ = 0x12, /* (meta socket) */ P_PING = 0x13, P_PING_ACK = 0x14, P_RECV_ACK = 0x15, /* Used in protocol B */ P_WRITE_ACK = 0x16, /* Used in protocol C */ P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */ P_SUPERSEDED = 0x18, /* Used in proto C, two-primaries conflict detection */ P_NEG_ACK = 0x19, /* Sent if local disk is unusable */ P_NEG_DREPLY = 0x1a, /* Local disk is broken... */ P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */ P_BARRIER_ACK = 0x1c, P_STATE_CHG_REPLY = 0x1d, /* "new" commands, no longer fitting into the ordering scheme above */ P_OV_REQUEST = 0x1e, /* data socket */ P_OV_REPLY = 0x1f, P_OV_RESULT = 0x20, /* meta socket */ P_CSUM_RS_REQUEST = 0x21, /* data socket */ P_RS_IS_IN_SYNC = 0x22, /* meta socket */ P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */ P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */ /* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */ /* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */ P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */ P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */ P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */ P_CONN_ST_CHG_REQ = 0x2a, /* data sock: Connection wide state request */ P_CONN_ST_CHG_REPLY = 0x2b, /* meta sock: Connection side state req reply */ P_RETRY_WRITE = 0x2c, /* Protocol C: retry conflicting write request */ P_PROTOCOL_UPDATE = 0x2d, /* data sock: is used in established connections */ /* 0x2e to 0x30 reserved, used in drbd 9 */ /* REQ_OP_DISCARD. We used "discard" in different contexts before, * which is why I chose TRIM here, to disambiguate. */ P_TRIM = 0x31, /* Only use these two if both support FF_THIN_RESYNC */ P_RS_THIN_REQ = 0x32, /* Request a block for resync or reply P_RS_DEALLOCATED */ P_RS_DEALLOCATED = 0x33, /* Contains only zeros on sync source node */ /* REQ_WRITE_SAME. * On a receiving side without REQ_WRITE_SAME, * we may fall back to an opencoded loop instead. */ P_WSAME = 0x34, /* 0x35 already claimed in DRBD 9 */ P_ZEROES = 0x36, /* data sock: zero-out, WRITE_ZEROES */ /* 0x40 .. 0x48 already claimed in DRBD 9 */ P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */ P_MAX_OPT_CMD = 0x101, /* special command ids for handshake */ P_INITIAL_META = 0xfff1, /* First Packet on the MetaSock */ P_INITIAL_DATA = 0xfff2, /* First Packet on the Socket */ P_CONNECTION_FEATURES = 0xfffe /* FIXED for the next century! */ }; #ifndef __packed #define __packed __attribute__((packed)) #endif /* This is the layout for a packet on the wire. * The byteorder is the network byte order. * (except block_id and barrier fields. * these are pointers to local structs * and have no relevance for the partner, * which just echoes them as received.) * * NOTE that the payload starts at a long aligned offset, * regardless of 32 or 64 bit arch! */ struct p_header80 { u32 magic; u16 command; u16 length; /* bytes of data after this header */ } __packed; /* Header for big packets, Used for data packets exceeding 64kB */ struct p_header95 { u16 magic; /* use DRBD_MAGIC_BIG here */ u16 command; u32 length; } __packed; struct p_header100 { u32 magic; u16 volume; u16 command; u32 length; u32 pad; } __packed; /* These defines must not be changed without changing the protocol version. * New defines may only be introduced together with protocol version bump or * new protocol feature flags. */ #define DP_HARDBARRIER 1 /* no longer used */ #define DP_RW_SYNC 2 /* equals REQ_SYNC */ #define DP_MAY_SET_IN_SYNC 4 #define DP_UNPLUG 8 /* not used anymore */ #define DP_FUA 16 /* equals REQ_FUA */ #define DP_FLUSH 32 /* equals REQ_PREFLUSH */ #define DP_DISCARD 64 /* equals REQ_OP_DISCARD */ #define DP_SEND_RECEIVE_ACK 128 /* This is a proto B write request */ #define DP_SEND_WRITE_ACK 256 /* This is a proto C write request */ #define DP_WSAME 512 /* equiv. REQ_WRITE_SAME */ #define DP_ZEROES 1024 /* equiv. REQ_OP_WRITE_ZEROES */ /* possible combinations: * REQ_OP_WRITE_ZEROES: DP_DISCARD | DP_ZEROES * REQ_OP_WRITE_ZEROES + REQ_NOUNMAP: DP_ZEROES */ struct p_data { u64 sector; /* 64 bits sector number */ u64 block_id; /* to identify the request in protocol B&C */ u32 seq_num; u32 dp_flags; } __packed; struct p_trim { struct p_data p_data; u32 size; /* == bio->bi_size */ } __packed; struct p_wsame { struct p_data p_data; u32 size; /* == bio->bi_size */ } __packed; /* * commands which share a struct: * p_block_ack: * P_RECV_ACK (proto B), P_WRITE_ACK (proto C), * P_SUPERSEDED (proto C, two-primaries conflict detection) * p_block_req: * P_DATA_REQUEST, P_RS_DATA_REQUEST */ struct p_block_ack { u64 sector; u64 block_id; u32 blksize; u32 seq_num; } __packed; struct p_block_req { u64 sector; u64 block_id; u32 blksize; u32 pad; /* to multiple of 8 Byte */ } __packed; /* * commands with their own struct for additional fields: * P_CONNECTION_FEATURES * P_BARRIER * P_BARRIER_ACK * P_SYNC_PARAM * ReportParams */ /* supports TRIM/DISCARD on the "wire" protocol */ #define DRBD_FF_TRIM 1 /* Detect all-zeros during resync, and rather TRIM/UNMAP/DISCARD those blocks * instead of fully allocate a supposedly thin volume on initial resync */ #define DRBD_FF_THIN_RESYNC 2 /* supports REQ_WRITE_SAME on the "wire" protocol. * Note: this flag is overloaded, * its presence also * - indicates support for 128 MiB "batch bios", * max discard size of 128 MiB * instead of 4M before that. * - indicates that we exchange additional settings in p_sizes * drbd_send_sizes()/receive_sizes() */ #define DRBD_FF_WSAME 4 /* supports REQ_OP_WRITE_ZEROES on the "wire" protocol. * * We used to map that to "discard" on the sending side, and if we cannot * guarantee that discard zeroes data, the receiving side would map discard * back to zero-out. * * With the introduction of REQ_OP_WRITE_ZEROES, * we started to use that for both WRITE_ZEROES and DISCARDS, * hoping that WRITE_ZEROES would "do what we want", * UNMAP if possible, zero-out the rest. * * The example scenario is some LVM "thin" backend. * * While an un-allocated block on dm-thin reads as zeroes, on a dm-thin * with "skip_block_zeroing=true", after a partial block write allocated * that block, that same block may well map "undefined old garbage" from * the backends on LBAs that have not yet been written to. * * If we cannot distinguish between zero-out and discard on the receiving * side, to avoid "undefined old garbage" to pop up randomly at later times * on supposedly zero-initialized blocks, we'd need to map all discards to * zero-out on the receiving side. But that would potentially do a full * alloc on thinly provisioned backends, even when the expectation was to * unmap/trim/discard/de-allocate. * * We need to distinguish on the protocol level, whether we need to guarantee * zeroes (and thus use zero-out, potentially doing the mentioned full-alloc), * or if we want to put the emphasis on discard, and only do a "best effort * zeroing" (by "discarding" blocks aligned to discard-granularity, and zeroing * only potential unaligned head and tail clippings), to at least *try* to * avoid "false positives" in an online-verify later, hoping that someone * set skip_block_zeroing=false. */ #define DRBD_FF_WZEROES 8 struct p_connection_features { u32 protocol_min; u32 feature_flags; u32 protocol_max; /* should be more than enough for future enhancements * for now, feature_flags and the reserved array shall be zero. */ u32 _pad; u64 reserved[7]; } __packed; struct p_barrier { u32 barrier; /* barrier number _handle_ only */ u32 pad; /* to multiple of 8 Byte */ } __packed; struct p_barrier_ack { u32 barrier; u32 set_size; } __packed; struct p_rs_param { u32 resync_rate; /* Since protocol version 88 and higher. */ char verify_alg[0]; } __packed; struct p_rs_param_89 { u32 resync_rate; /* protocol version 89: */ char verify_alg[SHARED_SECRET_MAX]; char csums_alg[SHARED_SECRET_MAX]; } __packed; struct p_rs_param_95 { u32 resync_rate; char verify_alg[SHARED_SECRET_MAX]; char csums_alg[SHARED_SECRET_MAX]; u32 c_plan_ahead; u32 c_delay_target; u32 c_fill_target; u32 c_max_rate; } __packed; enum drbd_conn_flags { CF_DISCARD_MY_DATA = 1, CF_DRY_RUN = 2, }; struct p_protocol { u32 protocol; u32 after_sb_0p; u32 after_sb_1p; u32 after_sb_2p; u32 conn_flags; u32 two_primaries; /* Since protocol version 87 and higher. */ char integrity_alg[0]; } __packed; struct p_uuids { u64 uuid[UI_EXTENDED_SIZE]; } __packed; struct p_rs_uuid { u64 uuid; } __packed; /* optional queue_limits if (agreed_features & DRBD_FF_WSAME) * see also struct queue_limits, as of late 2015 */ struct o_qlim { /* we don't need it yet, but we may as well communicate it now */ u32 physical_block_size; /* so the original in struct queue_limits is unsigned short, * but I'd have to put in padding anyways. */ u32 logical_block_size; /* One incoming bio becomes one DRBD request, * which may be translated to several bio on the receiving side. * We don't need to communicate chunk/boundary/segment ... limits. */ /* various IO hints may be useful with "diskless client" setups */ u32 alignment_offset; u32 io_min; u32 io_opt; /* We may need to communicate integrity stuff at some point, * but let's not get ahead of ourselves. */ /* Backend discard capabilities. * Receiving side uses "blkdev_issue_discard()", no need to communicate * more specifics. If the backend cannot do discards, the DRBD peer * may fall back to blkdev_issue_zeroout(). */ u8 discard_enabled; u8 discard_zeroes_data; u8 write_same_capable; u8 _pad; } __packed; struct p_sizes { u64 d_size; /* size of disk */ u64 u_size; /* user requested size */ u64 c_size; /* current exported size */ u32 max_bio_size; /* Maximal size of a BIO */ u16 queue_order_type; /* not yet implemented in DRBD*/ u16 dds_flags; /* use enum dds_flags here. */ /* optional queue_limits if (agreed_features & DRBD_FF_WSAME) */ struct o_qlim qlim[0]; } __packed; struct p_state { u32 state; } __packed; struct p_req_state { u32 mask; u32 val; } __packed; struct p_req_state_reply { u32 retcode; } __packed; struct p_drbd06_param { u64 size; u32 state; u32 blksize; u32 protocol; u32 version; u32 gen_cnt[5]; u32 bit_map_gen[5]; } __packed; struct p_block_desc { u64 sector; u32 blksize; u32 pad; /* to multiple of 8 Byte */ } __packed; /* Valid values for the encoding field. * Bump proto version when changing this. */ enum drbd_bitmap_code { /* RLE_VLI_Bytes = 0, * and other bit variants had been defined during * algorithm evaluation. */ RLE_VLI_Bits = 2, }; struct p_compressed_bm { /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code * (encoding & 0x80): polarity (set/unset) of first runlength * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits * used to pad up to head.length bytes */ u8 encoding; u8 code[0]; } __packed; struct p_delay_probe93 { u32 seq_num; /* sequence number to match the two probe packets */ u32 offset; /* usecs the probe got sent after the reference time point */ } __packed; /* * Bitmap packets need to fit within a single page on the sender and receiver, * so we are limited to 4 KiB (and not to PAGE_SIZE, which can be bigger). */ #define DRBD_SOCKET_BUFFER_SIZE 4096 #endif /* __DRBD_PROTOCOL_H */
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