forked from luck/tmp_suning_uos_patched
0dee3c28af
These headers describe the types used to exchange messages between the Ceph client and various servers. All types are little-endian and packed. These headers are shared between the kernel and userspace, so all types are in terms of e.g. __u32. Additionally, we define a few magic values to identify the current version of the protocol(s) in use, so that discrepancies to be detected on mount. Signed-off-by: Sage Weil <sage@newdream.net>
158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
#ifndef __MSGR_H
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#define __MSGR_H
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/*
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* Data types for message passing layer used by Ceph.
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*/
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#define CEPH_MON_PORT 6789 /* default monitor port */
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/*
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* client-side processes will try to bind to ports in this
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* range, simply for the benefit of tools like nmap or wireshark
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* that would like to identify the protocol.
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*/
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#define CEPH_PORT_FIRST 6789
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#define CEPH_PORT_START 6800 /* non-monitors start here */
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#define CEPH_PORT_LAST 6900
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/*
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* tcp connection banner. include a protocol version. and adjust
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* whenever the wire protocol changes. try to keep this string length
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* constant.
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*/
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#define CEPH_BANNER "ceph v021"
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#define CEPH_BANNER_MAX_LEN 30
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/*
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* Rollover-safe type and comparator for 32-bit sequence numbers.
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* Comparator returns -1, 0, or 1.
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*/
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typedef __u32 ceph_seq_t;
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static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
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{
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return (__s32)a - (__s32)b;
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}
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/*
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* entity_name -- logical name for a process participating in the
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* network, e.g. 'mds0' or 'osd3'.
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*/
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struct ceph_entity_name {
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__u8 type; /* CEPH_ENTITY_TYPE_* */
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__le64 num;
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} __attribute__ ((packed));
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#define CEPH_ENTITY_TYPE_MON 1
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#define CEPH_ENTITY_TYPE_MDS 2
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#define CEPH_ENTITY_TYPE_OSD 3
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#define CEPH_ENTITY_TYPE_CLIENT 4
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#define CEPH_ENTITY_TYPE_ADMIN 5
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/*
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* entity_addr -- network address
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*/
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struct ceph_entity_addr {
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__le32 erank; /* entity's rank in process */
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__le32 nonce; /* unique id for process (e.g. pid) */
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struct sockaddr_storage in_addr;
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} __attribute__ ((packed));
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static inline bool ceph_entity_addr_is_local(const struct ceph_entity_addr *a,
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const struct ceph_entity_addr *b)
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{
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return a->nonce == b->nonce &&
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memcmp(&a->in_addr, &b->in_addr, sizeof(a->in_addr)) == 0;
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}
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static inline bool ceph_entity_addr_equal(const struct ceph_entity_addr *a,
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const struct ceph_entity_addr *b)
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{
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return memcmp(a, b, sizeof(*a)) == 0;
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}
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struct ceph_entity_inst {
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struct ceph_entity_name name;
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struct ceph_entity_addr addr;
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} __attribute__ ((packed));
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/* used by message exchange protocol */
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#define CEPH_MSGR_TAG_READY 1 /* server->client: ready for messages */
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#define CEPH_MSGR_TAG_RESETSESSION 2 /* server->client: reset, try again */
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#define CEPH_MSGR_TAG_WAIT 3 /* server->client: wait for racing
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incoming connection */
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#define CEPH_MSGR_TAG_RETRY_SESSION 4 /* server->client + cseq: try again
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with higher cseq */
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#define CEPH_MSGR_TAG_RETRY_GLOBAL 5 /* server->client + gseq: try again
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with higher gseq */
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#define CEPH_MSGR_TAG_CLOSE 6 /* closing pipe */
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#define CEPH_MSGR_TAG_MSG 7 /* message */
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#define CEPH_MSGR_TAG_ACK 8 /* message ack */
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#define CEPH_MSGR_TAG_KEEPALIVE 9 /* just a keepalive byte! */
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#define CEPH_MSGR_TAG_BADPROTOVER 10 /* bad protocol version */
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/*
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* connection negotiation
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*/
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struct ceph_msg_connect {
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__le32 host_type; /* CEPH_ENTITY_TYPE_* */
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__le32 global_seq; /* count connections initiated by this host */
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__le32 connect_seq; /* count connections initiated in this session */
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__le32 protocol_version;
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__u8 flags; /* CEPH_MSG_CONNECT_* */
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} __attribute__ ((packed));
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struct ceph_msg_connect_reply {
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__u8 tag;
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__le32 global_seq;
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__le32 connect_seq;
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__le32 protocol_version;
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__u8 flags;
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} __attribute__ ((packed));
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#define CEPH_MSG_CONNECT_LOSSY 1 /* messages i send may be safely dropped */
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/*
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* message header
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*/
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struct ceph_msg_header {
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__le64 seq; /* message seq# for this session */
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__le16 type; /* message type */
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__le16 priority; /* priority. higher value == higher priority */
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__le32 front_len; /* bytes in main payload */
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__le32 middle_len;/* bytes in middle payload */
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__le32 data_len; /* bytes of data payload */
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__le16 data_off; /* sender: include full offset;
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receiver: mask against ~PAGE_MASK */
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struct ceph_entity_inst src, orig_src;
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__le32 dst_erank;
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__le32 crc; /* header crc32c */
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} __attribute__ ((packed));
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#define CEPH_MSG_PRIO_LOW 64
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#define CEPH_MSG_PRIO_DEFAULT 127
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#define CEPH_MSG_PRIO_HIGH 196
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#define CEPH_MSG_PRIO_HIGHEST 255
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/*
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* follows data payload
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*/
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struct ceph_msg_footer {
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__le32 front_crc, middle_crc, data_crc;
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__u8 flags;
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} __attribute__ ((packed));
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#define CEPH_MSG_FOOTER_COMPLETE (1<<0) /* msg wasn't aborted */
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#define CEPH_MSG_FOOTER_NOCRC (1<<1) /* no data crc */
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#endif
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