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drbd: Split off on-the-wire protocol definitions
Keep the protocol definitions separate from the kernel code; they are useful in their own right. Signed-off-by: Andreas Gruenbacher <agruen@linbit.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
This commit is contained in:
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commit
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@ -46,6 +46,7 @@
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#include <linux/drbd_genl_api.h>
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#include <linux/drbd.h>
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#include "drbd_state.h"
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#include "drbd_protocol.h"
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#ifdef __CHECKER__
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# define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr")))
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@ -168,72 +169,6 @@ extern struct ratelimit_state drbd_ratelimit_state;
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extern struct idr minors; /* RCU, updates: genl_lock() */
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extern struct list_head drbd_tconns; /* RCU, updates: genl_lock() */
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/* on the wire */
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enum drbd_packet {
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/* receiver (data socket) */
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P_DATA = 0x00,
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P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */
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P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */
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P_BARRIER = 0x03,
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P_BITMAP = 0x04,
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P_BECOME_SYNC_TARGET = 0x05,
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P_BECOME_SYNC_SOURCE = 0x06,
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P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */
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P_DATA_REQUEST = 0x08, /* Used to ask for a data block */
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P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */
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P_SYNC_PARAM = 0x0a,
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P_PROTOCOL = 0x0b,
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P_UUIDS = 0x0c,
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P_SIZES = 0x0d,
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P_STATE = 0x0e,
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P_SYNC_UUID = 0x0f,
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P_AUTH_CHALLENGE = 0x10,
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P_AUTH_RESPONSE = 0x11,
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P_STATE_CHG_REQ = 0x12,
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/* asender (meta socket */
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P_PING = 0x13,
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P_PING_ACK = 0x14,
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P_RECV_ACK = 0x15, /* Used in protocol B */
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P_WRITE_ACK = 0x16, /* Used in protocol C */
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P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */
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P_SUPERSEDED = 0x18, /* Used in proto C, two-primaries conflict detection */
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P_NEG_ACK = 0x19, /* Sent if local disk is unusable */
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P_NEG_DREPLY = 0x1a, /* Local disk is broken... */
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P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */
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P_BARRIER_ACK = 0x1c,
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P_STATE_CHG_REPLY = 0x1d,
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/* "new" commands, no longer fitting into the ordering scheme above */
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P_OV_REQUEST = 0x1e, /* data socket */
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P_OV_REPLY = 0x1f,
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P_OV_RESULT = 0x20, /* meta socket */
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P_CSUM_RS_REQUEST = 0x21, /* data socket */
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P_RS_IS_IN_SYNC = 0x22, /* meta socket */
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P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
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P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */
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/* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */
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/* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */
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P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */
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P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */
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P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */
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P_CONN_ST_CHG_REQ = 0x2a, /* data sock: Connection wide state request */
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P_CONN_ST_CHG_REPLY = 0x2b, /* meta sock: Connection side state req reply */
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P_RETRY_WRITE = 0x2c, /* Protocol C: retry conflicting write request */
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P_PROTOCOL_UPDATE = 0x2d, /* data sock: is used in established connections */
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P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
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P_MAX_OPT_CMD = 0x101,
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/* special command ids for handshake */
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P_INITIAL_META = 0xfff1, /* First Packet on the MetaSock */
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P_INITIAL_DATA = 0xfff2, /* First Packet on the Socket */
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P_CONNECTION_FEATURES = 0xfffe /* FIXED for the next century! */
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};
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extern const char *cmdname(enum drbd_packet cmd);
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/* for sending/receiving the bitmap,
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@ -276,234 +211,8 @@ static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c)
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#endif
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}
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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/* This is the layout for a packet on the wire.
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* The byteorder is the network byte order.
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* (except block_id and barrier fields.
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* these are pointers to local structs
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* and have no relevance for the partner,
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* which just echoes them as received.)
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*
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* NOTE that the payload starts at a long aligned offset,
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* regardless of 32 or 64 bit arch!
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*/
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struct p_header80 {
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u32 magic;
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u16 command;
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u16 length; /* bytes of data after this header */
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} __packed;
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/* Header for big packets, Used for data packets exceeding 64kB */
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struct p_header95 {
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u16 magic; /* use DRBD_MAGIC_BIG here */
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u16 command;
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u32 length;
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} __packed;
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struct p_header100 {
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u32 magic;
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u16 volume;
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u16 command;
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u32 length;
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u32 pad;
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} __packed;
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extern unsigned int drbd_header_size(struct drbd_tconn *tconn);
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/* these defines must not be changed without changing the protocol version */
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#define DP_HARDBARRIER 1 /* depricated */
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#define DP_RW_SYNC 2 /* equals REQ_SYNC */
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#define DP_MAY_SET_IN_SYNC 4
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#define DP_UNPLUG 8 /* not used anymore */
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#define DP_FUA 16 /* equals REQ_FUA */
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#define DP_FLUSH 32 /* equals REQ_FLUSH */
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#define DP_DISCARD 64 /* equals REQ_DISCARD */
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#define DP_SEND_RECEIVE_ACK 128 /* This is a proto B write request */
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#define DP_SEND_WRITE_ACK 256 /* This is a proto C write request */
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struct p_data {
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u64 sector; /* 64 bits sector number */
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u64 block_id; /* to identify the request in protocol B&C */
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u32 seq_num;
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u32 dp_flags;
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} __packed;
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/*
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* commands which share a struct:
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* p_block_ack:
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* P_RECV_ACK (proto B), P_WRITE_ACK (proto C),
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* P_SUPERSEDED (proto C, two-primaries conflict detection)
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* p_block_req:
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* P_DATA_REQUEST, P_RS_DATA_REQUEST
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*/
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struct p_block_ack {
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u64 sector;
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u64 block_id;
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u32 blksize;
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u32 seq_num;
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} __packed;
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struct p_block_req {
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u64 sector;
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u64 block_id;
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u32 blksize;
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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/*
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* commands with their own struct for additional fields:
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* P_CONNECTION_FEATURES
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* P_BARRIER
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* P_BARRIER_ACK
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* P_SYNC_PARAM
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* ReportParams
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*/
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struct p_connection_features {
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u32 protocol_min;
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u32 feature_flags;
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u32 protocol_max;
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/* should be more than enough for future enhancements
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* for now, feature_flags and the reserved array shall be zero.
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*/
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u32 _pad;
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u64 reserved[7];
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} __packed;
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struct p_barrier {
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u32 barrier; /* barrier number _handle_ only */
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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struct p_barrier_ack {
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u32 barrier;
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u32 set_size;
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} __packed;
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struct p_rs_param {
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u32 resync_rate;
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/* Since protocol version 88 and higher. */
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char verify_alg[0];
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} __packed;
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struct p_rs_param_89 {
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u32 resync_rate;
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/* protocol version 89: */
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char verify_alg[SHARED_SECRET_MAX];
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char csums_alg[SHARED_SECRET_MAX];
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} __packed;
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struct p_rs_param_95 {
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u32 resync_rate;
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char verify_alg[SHARED_SECRET_MAX];
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char csums_alg[SHARED_SECRET_MAX];
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u32 c_plan_ahead;
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u32 c_delay_target;
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u32 c_fill_target;
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u32 c_max_rate;
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} __packed;
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enum drbd_conn_flags {
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CF_DISCARD_MY_DATA = 1,
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CF_DRY_RUN = 2,
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};
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struct p_protocol {
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u32 protocol;
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u32 after_sb_0p;
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u32 after_sb_1p;
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u32 after_sb_2p;
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u32 conn_flags;
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u32 two_primaries;
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/* Since protocol version 87 and higher. */
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char integrity_alg[0];
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} __packed;
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struct p_uuids {
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u64 uuid[UI_EXTENDED_SIZE];
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} __packed;
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struct p_rs_uuid {
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u64 uuid;
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} __packed;
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struct p_sizes {
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u64 d_size; /* size of disk */
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u64 u_size; /* user requested size */
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u64 c_size; /* current exported size */
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u32 max_bio_size; /* Maximal size of a BIO */
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u16 queue_order_type; /* not yet implemented in DRBD*/
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u16 dds_flags; /* use enum dds_flags here. */
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} __packed;
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struct p_state {
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u32 state;
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} __packed;
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struct p_req_state {
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u32 mask;
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u32 val;
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} __packed;
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struct p_req_state_reply {
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u32 retcode;
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} __packed;
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struct p_drbd06_param {
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u64 size;
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u32 state;
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u32 blksize;
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u32 protocol;
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u32 version;
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u32 gen_cnt[5];
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u32 bit_map_gen[5];
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} __packed;
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struct p_block_desc {
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u64 sector;
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u32 blksize;
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u32 pad; /* to multiple of 8 Byte */
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} __packed;
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/* Valid values for the encoding field.
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* Bump proto version when changing this. */
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enum drbd_bitmap_code {
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/* RLE_VLI_Bytes = 0,
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* and other bit variants had been defined during
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* algorithm evaluation. */
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RLE_VLI_Bits = 2,
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};
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struct p_compressed_bm {
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/* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code
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* (encoding & 0x80): polarity (set/unset) of first runlength
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* ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits
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* used to pad up to head.length bytes
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*/
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u8 encoding;
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u8 code[0];
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} __packed;
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struct p_delay_probe93 {
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u32 seq_num; /* sequence number to match the two probe packets */
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u32 offset; /* usecs the probe got sent after the reference time point */
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} __packed;
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/*
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* Bitmap packets need to fit within a single page on the sender and receiver,
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* so we are limited to 4 KiB (and not to PAGE_SIZE, which can be bigger).
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*/
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#define DRBD_SOCKET_BUFFER_SIZE 4096
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/**********************************************************************/
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enum drbd_thread_state {
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NONE,
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@ -52,6 +52,7 @@
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#include <linux/drbd_limits.h>
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#include "drbd_int.h"
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#include "drbd_protocol.h"
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#include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
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#include "drbd_vli.h"
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@ -32,6 +32,7 @@
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#include <linux/blkpg.h>
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#include <linux/cpumask.h>
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#include "drbd_int.h"
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#include "drbd_protocol.h"
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#include "drbd_req.h"
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#include "drbd_wrappers.h"
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#include <asm/unaligned.h>
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295
drivers/block/drbd/drbd_protocol.h
Normal file
295
drivers/block/drbd/drbd_protocol.h
Normal file
@ -0,0 +1,295 @@
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#ifndef __DRBD_PROTOCOL_H
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#define __DRBD_PROTOCOL_H
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enum drbd_packet {
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/* receiver (data socket) */
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P_DATA = 0x00,
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P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */
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P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */
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P_BARRIER = 0x03,
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P_BITMAP = 0x04,
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P_BECOME_SYNC_TARGET = 0x05,
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P_BECOME_SYNC_SOURCE = 0x06,
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P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */
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P_DATA_REQUEST = 0x08, /* Used to ask for a data block */
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P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */
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P_SYNC_PARAM = 0x0a,
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P_PROTOCOL = 0x0b,
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P_UUIDS = 0x0c,
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P_SIZES = 0x0d,
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P_STATE = 0x0e,
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P_SYNC_UUID = 0x0f,
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P_AUTH_CHALLENGE = 0x10,
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P_AUTH_RESPONSE = 0x11,
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P_STATE_CHG_REQ = 0x12,
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/* asender (meta socket */
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P_PING = 0x13,
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P_PING_ACK = 0x14,
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P_RECV_ACK = 0x15, /* Used in protocol B */
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P_WRITE_ACK = 0x16, /* Used in protocol C */
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P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */
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P_SUPERSEDED = 0x18, /* Used in proto C, two-primaries conflict detection */
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P_NEG_ACK = 0x19, /* Sent if local disk is unusable */
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P_NEG_DREPLY = 0x1a, /* Local disk is broken... */
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P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */
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P_BARRIER_ACK = 0x1c,
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P_STATE_CHG_REPLY = 0x1d,
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/* "new" commands, no longer fitting into the ordering scheme above */
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P_OV_REQUEST = 0x1e, /* data socket */
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P_OV_REPLY = 0x1f,
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P_OV_RESULT = 0x20, /* meta socket */
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P_CSUM_RS_REQUEST = 0x21, /* data socket */
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P_RS_IS_IN_SYNC = 0x22, /* meta socket */
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P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
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P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */
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/* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */
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/* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */
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P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */
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P_OUT_OF_SYNC = 0x28, /* Mark as out of sync (Outrunning), data socket */
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P_RS_CANCEL = 0x29, /* meta: Used to cancel RS_DATA_REQUEST packet by SyncSource */
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P_CONN_ST_CHG_REQ = 0x2a, /* data sock: Connection wide state request */
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P_CONN_ST_CHG_REPLY = 0x2b, /* meta sock: Connection side state req reply */
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P_RETRY_WRITE = 0x2c, /* Protocol C: retry conflicting write request */
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P_PROTOCOL_UPDATE = 0x2d, /* data sock: is used in established connections */
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P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
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P_MAX_OPT_CMD = 0x101,
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/* special command ids for handshake */
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P_INITIAL_META = 0xfff1, /* First Packet on the MetaSock */
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P_INITIAL_DATA = 0xfff2, /* First Packet on the Socket */
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P_CONNECTION_FEATURES = 0xfffe /* FIXED for the next century! */
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};
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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/* This is the layout for a packet on the wire.
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* The byteorder is the network byte order.
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* (except block_id and barrier fields.
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* these are pointers to local structs
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* and have no relevance for the partner,
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* which just echoes them as received.)
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*
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* NOTE that the payload starts at a long aligned offset,
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* regardless of 32 or 64 bit arch!
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*/
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struct p_header80 {
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u32 magic;
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u16 command;
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u16 length; /* bytes of data after this header */
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} __packed;
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/* Header for big packets, Used for data packets exceeding 64kB */
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struct p_header95 {
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u16 magic; /* use DRBD_MAGIC_BIG here */
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u16 command;
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u32 length;
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} __packed;
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struct p_header100 {
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u32 magic;
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u16 volume;
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u16 command;
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u32 length;
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u32 pad;
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} __packed;
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/* these defines must not be changed without changing the protocol version */
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#define DP_HARDBARRIER 1 /* depricated */
|
||||
#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_FLUSH */
|
||||
#define DP_DISCARD 64 /* equals REQ_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 */
|
||||
|
||||
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;
|
||||
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
|
||||
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;
|
||||
|
||||
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. */
|
||||
} __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 */
|
@ -44,6 +44,7 @@
|
||||
#include <linux/string.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include "drbd_int.h"
|
||||
#include "drbd_protocol.h"
|
||||
#include "drbd_req.h"
|
||||
|
||||
#include "drbd_vli.h"
|
||||
|
@ -27,6 +27,7 @@
|
||||
|
||||
#include <linux/drbd_limits.h>
|
||||
#include "drbd_int.h"
|
||||
#include "drbd_protocol.h"
|
||||
#include "drbd_req.h"
|
||||
|
||||
struct after_state_chg_work {
|
||||
|
@ -36,6 +36,7 @@
|
||||
#include <linux/scatterlist.h>
|
||||
|
||||
#include "drbd_int.h"
|
||||
#include "drbd_protocol.h"
|
||||
#include "drbd_req.h"
|
||||
|
||||
static int w_make_ov_request(struct drbd_work *w, int cancel);
|
||||
|
Loading…
Reference in New Issue
Block a user