ceph: factor out libceph from Ceph file system
This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Yehuda Sadeh
261
include/linux/ceph/messenger.h
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261
include/linux/ceph/messenger.h
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#ifndef __FS_CEPH_MESSENGER_H
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#define __FS_CEPH_MESSENGER_H
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/net.h>
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#include <linux/radix-tree.h>
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#include <linux/uio.h>
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#include <linux/version.h>
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#include <linux/workqueue.h>
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#include "types.h"
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#include "buffer.h"
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struct ceph_msg;
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struct ceph_connection;
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extern struct workqueue_struct *ceph_msgr_wq; /* receive work queue */
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/*
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* Ceph defines these callbacks for handling connection events.
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*/
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struct ceph_connection_operations {
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struct ceph_connection *(*get)(struct ceph_connection *);
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void (*put)(struct ceph_connection *);
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/* handle an incoming message. */
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void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
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/* authorize an outgoing connection */
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int (*get_authorizer) (struct ceph_connection *con,
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void **buf, int *len, int *proto,
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void **reply_buf, int *reply_len, int force_new);
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int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
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int (*invalidate_authorizer)(struct ceph_connection *con);
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/* protocol version mismatch */
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void (*bad_proto) (struct ceph_connection *con);
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/* there was some error on the socket (disconnect, whatever) */
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void (*fault) (struct ceph_connection *con);
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/* a remote host as terminated a message exchange session, and messages
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* we sent (or they tried to send us) may be lost. */
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void (*peer_reset) (struct ceph_connection *con);
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struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
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struct ceph_msg_header *hdr,
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int *skip);
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};
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/* use format string %s%d */
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#define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
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struct ceph_messenger {
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struct ceph_entity_inst inst; /* my name+address */
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struct ceph_entity_addr my_enc_addr;
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struct page *zero_page; /* used in certain error cases */
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bool nocrc;
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/*
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* the global_seq counts connections i (attempt to) initiate
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* in order to disambiguate certain connect race conditions.
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*/
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u32 global_seq;
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spinlock_t global_seq_lock;
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u32 supported_features;
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u32 required_features;
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};
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/*
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* a single message. it contains a header (src, dest, message type, etc.),
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* footer (crc values, mainly), a "front" message body, and possibly a
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* data payload (stored in some number of pages).
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*/
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struct ceph_msg {
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struct ceph_msg_header hdr; /* header */
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struct ceph_msg_footer footer; /* footer */
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struct kvec front; /* unaligned blobs of message */
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struct ceph_buffer *middle;
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struct page **pages; /* data payload. NOT OWNER. */
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unsigned nr_pages; /* size of page array */
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struct ceph_pagelist *pagelist; /* instead of pages */
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struct list_head list_head;
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struct kref kref;
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struct bio *bio; /* instead of pages/pagelist */
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struct bio *bio_iter; /* bio iterator */
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int bio_seg; /* current bio segment */
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struct ceph_pagelist *trail; /* the trailing part of the data */
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bool front_is_vmalloc;
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bool more_to_follow;
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bool needs_out_seq;
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int front_max;
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struct ceph_msgpool *pool;
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};
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struct ceph_msg_pos {
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int page, page_pos; /* which page; offset in page */
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int data_pos; /* offset in data payload */
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int did_page_crc; /* true if we've calculated crc for current page */
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};
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/* ceph connection fault delay defaults, for exponential backoff */
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#define BASE_DELAY_INTERVAL (HZ/2)
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#define MAX_DELAY_INTERVAL (5 * 60 * HZ)
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/*
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* ceph_connection state bit flags
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*
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* QUEUED and BUSY are used together to ensure that only a single
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* thread is currently opening, reading or writing data to the socket.
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*/
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#define LOSSYTX 0 /* we can close channel or drop messages on errors */
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#define CONNECTING 1
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#define NEGOTIATING 2
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#define KEEPALIVE_PENDING 3
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#define WRITE_PENDING 4 /* we have data ready to send */
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#define QUEUED 5 /* there is work queued on this connection */
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#define BUSY 6 /* work is being done */
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#define STANDBY 8 /* no outgoing messages, socket closed. we keep
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* the ceph_connection around to maintain shared
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* state with the peer. */
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#define CLOSED 10 /* we've closed the connection */
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#define SOCK_CLOSED 11 /* socket state changed to closed */
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#define OPENING 13 /* open connection w/ (possibly new) peer */
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#define DEAD 14 /* dead, about to kfree */
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/*
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* A single connection with another host.
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*
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* We maintain a queue of outgoing messages, and some session state to
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* ensure that we can preserve the lossless, ordered delivery of
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* messages in the case of a TCP disconnect.
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*/
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struct ceph_connection {
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void *private;
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atomic_t nref;
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const struct ceph_connection_operations *ops;
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struct ceph_messenger *msgr;
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struct socket *sock;
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unsigned long state; /* connection state (see flags above) */
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const char *error_msg; /* error message, if any */
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struct ceph_entity_addr peer_addr; /* peer address */
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struct ceph_entity_name peer_name; /* peer name */
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struct ceph_entity_addr peer_addr_for_me;
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unsigned peer_features;
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u32 connect_seq; /* identify the most recent connection
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attempt for this connection, client */
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u32 peer_global_seq; /* peer's global seq for this connection */
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int auth_retry; /* true if we need a newer authorizer */
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void *auth_reply_buf; /* where to put the authorizer reply */
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int auth_reply_buf_len;
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struct mutex mutex;
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/* out queue */
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struct list_head out_queue;
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struct list_head out_sent; /* sending or sent but unacked */
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u64 out_seq; /* last message queued for send */
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bool out_keepalive_pending;
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u64 in_seq, in_seq_acked; /* last message received, acked */
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/* connection negotiation temps */
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char in_banner[CEPH_BANNER_MAX_LEN];
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union {
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struct { /* outgoing connection */
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struct ceph_msg_connect out_connect;
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struct ceph_msg_connect_reply in_reply;
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};
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struct { /* incoming */
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struct ceph_msg_connect in_connect;
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struct ceph_msg_connect_reply out_reply;
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};
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};
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struct ceph_entity_addr actual_peer_addr;
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/* message out temps */
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struct ceph_msg *out_msg; /* sending message (== tail of
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out_sent) */
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bool out_msg_done;
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struct ceph_msg_pos out_msg_pos;
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struct kvec out_kvec[8], /* sending header/footer data */
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*out_kvec_cur;
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int out_kvec_left; /* kvec's left in out_kvec */
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int out_skip; /* skip this many bytes */
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int out_kvec_bytes; /* total bytes left */
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bool out_kvec_is_msg; /* kvec refers to out_msg */
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int out_more; /* there is more data after the kvecs */
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__le64 out_temp_ack; /* for writing an ack */
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/* message in temps */
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struct ceph_msg_header in_hdr;
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struct ceph_msg *in_msg;
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struct ceph_msg_pos in_msg_pos;
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u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */
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char in_tag; /* protocol control byte */
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int in_base_pos; /* bytes read */
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__le64 in_temp_ack; /* for reading an ack */
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struct delayed_work work; /* send|recv work */
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unsigned long delay; /* current delay interval */
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};
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extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
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extern int ceph_parse_ips(const char *c, const char *end,
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struct ceph_entity_addr *addr,
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int max_count, int *count);
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extern int ceph_msgr_init(void);
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extern void ceph_msgr_exit(void);
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extern void ceph_msgr_flush(void);
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extern struct ceph_messenger *ceph_messenger_create(
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struct ceph_entity_addr *myaddr,
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u32 features, u32 required);
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extern void ceph_messenger_destroy(struct ceph_messenger *);
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extern void ceph_con_init(struct ceph_messenger *msgr,
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struct ceph_connection *con);
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extern void ceph_con_open(struct ceph_connection *con,
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struct ceph_entity_addr *addr);
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extern bool ceph_con_opened(struct ceph_connection *con);
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extern void ceph_con_close(struct ceph_connection *con);
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extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
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extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
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extern void ceph_con_revoke_message(struct ceph_connection *con,
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struct ceph_msg *msg);
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extern void ceph_con_keepalive(struct ceph_connection *con);
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extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
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extern void ceph_con_put(struct ceph_connection *con);
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extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags);
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extern void ceph_msg_kfree(struct ceph_msg *m);
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static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
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{
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kref_get(&msg->kref);
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return msg;
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}
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extern void ceph_msg_last_put(struct kref *kref);
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static inline void ceph_msg_put(struct ceph_msg *msg)
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{
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kref_put(&msg->kref, ceph_msg_last_put);
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}
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extern void ceph_msg_dump(struct ceph_msg *msg);
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#endif
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