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0fa6ebc600
We should not set con->state to CLOSED here; that happens in ceph_fault() in the caller, where it first asserts that the state is not yet CLOSED. Avoids a BUG when the features don't match. Since the fail_protocol() has become a trivial wrapper, replace calls to it with direct calls to reset_connection(). Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com>
2861 lines
71 KiB
C
2861 lines
71 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/crc32c.h>
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#include <linux/ctype.h>
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#include <linux/highmem.h>
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#include <linux/inet.h>
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#include <linux/kthread.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/dns_resolver.h>
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#include <net/tcp.h>
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/messenger.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/pagelist.h>
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#include <linux/export.h>
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/*
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* Ceph uses the messenger to exchange ceph_msg messages with other
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* hosts in the system. The messenger provides ordered and reliable
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* delivery. We tolerate TCP disconnects by reconnecting (with
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* exponential backoff) in the case of a fault (disconnection, bad
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* crc, protocol error). Acks allow sent messages to be discarded by
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* the sender.
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*/
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/*
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* We track the state of the socket on a given connection using
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* values defined below. The transition to a new socket state is
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* handled by a function which verifies we aren't coming from an
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* unexpected state.
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*
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* --------
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* | NEW* | transient initial state
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* --------
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* | con_sock_state_init()
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* v
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* ----------
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* | CLOSED | initialized, but no socket (and no
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* ---------- TCP connection)
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* ^ \
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* | \ con_sock_state_connecting()
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* | ----------------------
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* | \
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* + con_sock_state_closed() \
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* |+--------------------------- \
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* | \ \ \
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* | ----------- \ \
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* | | CLOSING | socket event; \ \
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* | ----------- await close \ \
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* | ^ \ |
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* | | \ |
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* | + con_sock_state_closing() \ |
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* | / \ | |
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* | / --------------- | |
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* | / \ v v
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* | / --------------
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* | / -----------------| CONNECTING | socket created, TCP
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* | | / -------------- connect initiated
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* | | | con_sock_state_connected()
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* | | v
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* -------------
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* | CONNECTED | TCP connection established
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* -------------
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*
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* State values for ceph_connection->sock_state; NEW is assumed to be 0.
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*/
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#define CON_SOCK_STATE_NEW 0 /* -> CLOSED */
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#define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */
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#define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */
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#define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */
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#define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */
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/*
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* connection states
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*/
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#define CON_STATE_CLOSED 1 /* -> PREOPEN */
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#define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */
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#define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */
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#define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */
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#define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */
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#define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */
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/*
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* ceph_connection flag bits
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*/
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#define CON_FLAG_LOSSYTX 0 /* we can close channel or drop
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* messages on errors */
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#define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
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#define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */
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#define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */
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#define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */
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/* static tag bytes (protocol control messages) */
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static char tag_msg = CEPH_MSGR_TAG_MSG;
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static char tag_ack = CEPH_MSGR_TAG_ACK;
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static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
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#ifdef CONFIG_LOCKDEP
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static struct lock_class_key socket_class;
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#endif
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/*
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* When skipping (ignoring) a block of input we read it into a "skip
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* buffer," which is this many bytes in size.
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*/
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#define SKIP_BUF_SIZE 1024
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static void queue_con(struct ceph_connection *con);
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static void con_work(struct work_struct *);
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static void ceph_fault(struct ceph_connection *con);
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/*
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* Nicely render a sockaddr as a string. An array of formatted
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* strings is used, to approximate reentrancy.
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*/
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#define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
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#define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
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#define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
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#define MAX_ADDR_STR_LEN 64 /* 54 is enough */
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static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
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static atomic_t addr_str_seq = ATOMIC_INIT(0);
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static struct page *zero_page; /* used in certain error cases */
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const char *ceph_pr_addr(const struct sockaddr_storage *ss)
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{
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int i;
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char *s;
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struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
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struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
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i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
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s = addr_str[i];
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switch (ss->ss_family) {
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case AF_INET:
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snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr,
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ntohs(in4->sin_port));
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break;
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case AF_INET6:
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snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr,
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ntohs(in6->sin6_port));
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break;
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default:
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snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
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ss->ss_family);
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}
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return s;
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}
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EXPORT_SYMBOL(ceph_pr_addr);
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static void encode_my_addr(struct ceph_messenger *msgr)
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{
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memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
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ceph_encode_addr(&msgr->my_enc_addr);
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}
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/*
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* work queue for all reading and writing to/from the socket.
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*/
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static struct workqueue_struct *ceph_msgr_wq;
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void _ceph_msgr_exit(void)
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{
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if (ceph_msgr_wq) {
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destroy_workqueue(ceph_msgr_wq);
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ceph_msgr_wq = NULL;
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}
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BUG_ON(zero_page == NULL);
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kunmap(zero_page);
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page_cache_release(zero_page);
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zero_page = NULL;
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}
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int ceph_msgr_init(void)
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{
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BUG_ON(zero_page != NULL);
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zero_page = ZERO_PAGE(0);
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page_cache_get(zero_page);
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ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
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if (ceph_msgr_wq)
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return 0;
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pr_err("msgr_init failed to create workqueue\n");
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_ceph_msgr_exit();
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return -ENOMEM;
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}
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EXPORT_SYMBOL(ceph_msgr_init);
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void ceph_msgr_exit(void)
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{
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BUG_ON(ceph_msgr_wq == NULL);
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_ceph_msgr_exit();
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}
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EXPORT_SYMBOL(ceph_msgr_exit);
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void ceph_msgr_flush(void)
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{
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flush_workqueue(ceph_msgr_wq);
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}
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EXPORT_SYMBOL(ceph_msgr_flush);
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/* Connection socket state transition functions */
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static void con_sock_state_init(struct ceph_connection *con)
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{
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int old_state;
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old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
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if (WARN_ON(old_state != CON_SOCK_STATE_NEW))
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printk("%s: unexpected old state %d\n", __func__, old_state);
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dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
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CON_SOCK_STATE_CLOSED);
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}
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static void con_sock_state_connecting(struct ceph_connection *con)
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{
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int old_state;
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old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING);
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if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED))
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printk("%s: unexpected old state %d\n", __func__, old_state);
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dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
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CON_SOCK_STATE_CONNECTING);
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}
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static void con_sock_state_connected(struct ceph_connection *con)
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{
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int old_state;
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old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED);
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if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING))
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printk("%s: unexpected old state %d\n", __func__, old_state);
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dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
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CON_SOCK_STATE_CONNECTED);
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}
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static void con_sock_state_closing(struct ceph_connection *con)
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{
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int old_state;
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old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING);
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if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING &&
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old_state != CON_SOCK_STATE_CONNECTED &&
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old_state != CON_SOCK_STATE_CLOSING))
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printk("%s: unexpected old state %d\n", __func__, old_state);
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dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
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CON_SOCK_STATE_CLOSING);
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}
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static void con_sock_state_closed(struct ceph_connection *con)
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{
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int old_state;
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old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED);
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if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED &&
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old_state != CON_SOCK_STATE_CLOSING &&
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old_state != CON_SOCK_STATE_CONNECTING &&
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old_state != CON_SOCK_STATE_CLOSED))
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printk("%s: unexpected old state %d\n", __func__, old_state);
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dout("%s con %p sock %d -> %d\n", __func__, con, old_state,
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CON_SOCK_STATE_CLOSED);
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}
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/*
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* socket callback functions
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*/
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/* data available on socket, or listen socket received a connect */
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static void ceph_sock_data_ready(struct sock *sk, int count_unused)
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{
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struct ceph_connection *con = sk->sk_user_data;
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if (atomic_read(&con->msgr->stopping)) {
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return;
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}
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if (sk->sk_state != TCP_CLOSE_WAIT) {
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dout("%s on %p state = %lu, queueing work\n", __func__,
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con, con->state);
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queue_con(con);
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}
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}
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/* socket has buffer space for writing */
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static void ceph_sock_write_space(struct sock *sk)
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{
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struct ceph_connection *con = sk->sk_user_data;
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/* only queue to workqueue if there is data we want to write,
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* and there is sufficient space in the socket buffer to accept
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* more data. clear SOCK_NOSPACE so that ceph_sock_write_space()
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* doesn't get called again until try_write() fills the socket
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* buffer. See net/ipv4/tcp_input.c:tcp_check_space()
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* and net/core/stream.c:sk_stream_write_space().
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*/
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if (test_bit(CON_FLAG_WRITE_PENDING, &con->flags)) {
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if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
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dout("%s %p queueing write work\n", __func__, con);
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clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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queue_con(con);
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}
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} else {
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dout("%s %p nothing to write\n", __func__, con);
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}
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}
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/* socket's state has changed */
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static void ceph_sock_state_change(struct sock *sk)
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{
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struct ceph_connection *con = sk->sk_user_data;
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dout("%s %p state = %lu sk_state = %u\n", __func__,
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con, con->state, sk->sk_state);
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switch (sk->sk_state) {
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case TCP_CLOSE:
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dout("%s TCP_CLOSE\n", __func__);
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case TCP_CLOSE_WAIT:
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dout("%s TCP_CLOSE_WAIT\n", __func__);
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con_sock_state_closing(con);
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set_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
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queue_con(con);
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break;
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case TCP_ESTABLISHED:
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dout("%s TCP_ESTABLISHED\n", __func__);
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con_sock_state_connected(con);
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queue_con(con);
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break;
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default: /* Everything else is uninteresting */
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break;
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}
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}
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/*
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* set up socket callbacks
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*/
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static void set_sock_callbacks(struct socket *sock,
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struct ceph_connection *con)
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{
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struct sock *sk = sock->sk;
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sk->sk_user_data = con;
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sk->sk_data_ready = ceph_sock_data_ready;
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sk->sk_write_space = ceph_sock_write_space;
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sk->sk_state_change = ceph_sock_state_change;
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}
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/*
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* socket helpers
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*/
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/*
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* initiate connection to a remote socket.
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*/
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static int ceph_tcp_connect(struct ceph_connection *con)
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{
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struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
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struct socket *sock;
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int ret;
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BUG_ON(con->sock);
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ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
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IPPROTO_TCP, &sock);
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if (ret)
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return ret;
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sock->sk->sk_allocation = GFP_NOFS;
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#ifdef CONFIG_LOCKDEP
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lockdep_set_class(&sock->sk->sk_lock, &socket_class);
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#endif
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set_sock_callbacks(sock, con);
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dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
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con_sock_state_connecting(con);
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ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
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O_NONBLOCK);
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if (ret == -EINPROGRESS) {
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dout("connect %s EINPROGRESS sk_state = %u\n",
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ceph_pr_addr(&con->peer_addr.in_addr),
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sock->sk->sk_state);
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} else if (ret < 0) {
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pr_err("connect %s error %d\n",
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ceph_pr_addr(&con->peer_addr.in_addr), ret);
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sock_release(sock);
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con->error_msg = "connect error";
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return ret;
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}
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con->sock = sock;
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return 0;
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}
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static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
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{
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struct kvec iov = {buf, len};
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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int r;
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r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
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if (r == -EAGAIN)
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r = 0;
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return r;
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}
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/*
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* write something. @more is true if caller will be sending more data
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* shortly.
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*/
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static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
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size_t kvlen, size_t len, int more)
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{
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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int r;
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if (more)
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msg.msg_flags |= MSG_MORE;
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else
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msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
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r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
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if (r == -EAGAIN)
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r = 0;
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return r;
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}
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static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int more)
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{
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int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
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int ret;
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ret = kernel_sendpage(sock, page, offset, size, flags);
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if (ret == -EAGAIN)
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ret = 0;
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return ret;
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}
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/*
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* Shutdown/close the socket for the given connection.
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*/
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static int con_close_socket(struct ceph_connection *con)
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{
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int rc = 0;
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dout("con_close_socket on %p sock %p\n", con, con->sock);
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if (con->sock) {
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rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
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sock_release(con->sock);
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con->sock = NULL;
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}
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/*
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* Forcibly clear the SOCK_CLOSED flag. It gets set
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* independent of the connection mutex, and we could have
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* received a socket close event before we had the chance to
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* shut the socket down.
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*/
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clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags);
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con_sock_state_closed(con);
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return rc;
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}
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/*
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* Reset a connection. Discard all incoming and outgoing messages
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* and clear *_seq state.
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*/
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static void ceph_msg_remove(struct ceph_msg *msg)
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{
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list_del_init(&msg->list_head);
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|
BUG_ON(msg->con == NULL);
|
|
msg->con->ops->put(msg->con);
|
|
msg->con = NULL;
|
|
|
|
ceph_msg_put(msg);
|
|
}
|
|
static void ceph_msg_remove_list(struct list_head *head)
|
|
{
|
|
while (!list_empty(head)) {
|
|
struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
|
|
list_head);
|
|
ceph_msg_remove(msg);
|
|
}
|
|
}
|
|
|
|
static void reset_connection(struct ceph_connection *con)
|
|
{
|
|
/* reset connection, out_queue, msg_ and connect_seq */
|
|
/* discard existing out_queue and msg_seq */
|
|
dout("reset_connection %p\n", con);
|
|
ceph_msg_remove_list(&con->out_queue);
|
|
ceph_msg_remove_list(&con->out_sent);
|
|
|
|
if (con->in_msg) {
|
|
BUG_ON(con->in_msg->con != con);
|
|
con->in_msg->con = NULL;
|
|
ceph_msg_put(con->in_msg);
|
|
con->in_msg = NULL;
|
|
con->ops->put(con);
|
|
}
|
|
|
|
con->connect_seq = 0;
|
|
con->out_seq = 0;
|
|
if (con->out_msg) {
|
|
ceph_msg_put(con->out_msg);
|
|
con->out_msg = NULL;
|
|
}
|
|
con->in_seq = 0;
|
|
con->in_seq_acked = 0;
|
|
}
|
|
|
|
/*
|
|
* mark a peer down. drop any open connections.
|
|
*/
|
|
void ceph_con_close(struct ceph_connection *con)
|
|
{
|
|
mutex_lock(&con->mutex);
|
|
dout("con_close %p peer %s\n", con,
|
|
ceph_pr_addr(&con->peer_addr.in_addr));
|
|
con->state = CON_STATE_CLOSED;
|
|
|
|
clear_bit(CON_FLAG_LOSSYTX, &con->flags); /* so we retry next connect */
|
|
clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags);
|
|
clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags);
|
|
clear_bit(CON_FLAG_BACKOFF, &con->flags);
|
|
|
|
reset_connection(con);
|
|
con->peer_global_seq = 0;
|
|
cancel_delayed_work(&con->work);
|
|
con_close_socket(con);
|
|
mutex_unlock(&con->mutex);
|
|
}
|
|
EXPORT_SYMBOL(ceph_con_close);
|
|
|
|
/*
|
|
* Reopen a closed connection, with a new peer address.
|
|
*/
|
|
void ceph_con_open(struct ceph_connection *con,
|
|
__u8 entity_type, __u64 entity_num,
|
|
struct ceph_entity_addr *addr)
|
|
{
|
|
mutex_lock(&con->mutex);
|
|
dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
|
|
|
|
WARN_ON(con->state != CON_STATE_CLOSED);
|
|
con->state = CON_STATE_PREOPEN;
|
|
|
|
con->peer_name.type = (__u8) entity_type;
|
|
con->peer_name.num = cpu_to_le64(entity_num);
|
|
|
|
memcpy(&con->peer_addr, addr, sizeof(*addr));
|
|
con->delay = 0; /* reset backoff memory */
|
|
mutex_unlock(&con->mutex);
|
|
queue_con(con);
|
|
}
|
|
EXPORT_SYMBOL(ceph_con_open);
|
|
|
|
/*
|
|
* return true if this connection ever successfully opened
|
|
*/
|
|
bool ceph_con_opened(struct ceph_connection *con)
|
|
{
|
|
return con->connect_seq > 0;
|
|
}
|
|
|
|
/*
|
|
* initialize a new connection.
|
|
*/
|
|
void ceph_con_init(struct ceph_connection *con, void *private,
|
|
const struct ceph_connection_operations *ops,
|
|
struct ceph_messenger *msgr)
|
|
{
|
|
dout("con_init %p\n", con);
|
|
memset(con, 0, sizeof(*con));
|
|
con->private = private;
|
|
con->ops = ops;
|
|
con->msgr = msgr;
|
|
|
|
con_sock_state_init(con);
|
|
|
|
mutex_init(&con->mutex);
|
|
INIT_LIST_HEAD(&con->out_queue);
|
|
INIT_LIST_HEAD(&con->out_sent);
|
|
INIT_DELAYED_WORK(&con->work, con_work);
|
|
|
|
con->state = CON_STATE_CLOSED;
|
|
}
|
|
EXPORT_SYMBOL(ceph_con_init);
|
|
|
|
|
|
/*
|
|
* We maintain a global counter to order connection attempts. Get
|
|
* a unique seq greater than @gt.
|
|
*/
|
|
static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
|
|
{
|
|
u32 ret;
|
|
|
|
spin_lock(&msgr->global_seq_lock);
|
|
if (msgr->global_seq < gt)
|
|
msgr->global_seq = gt;
|
|
ret = ++msgr->global_seq;
|
|
spin_unlock(&msgr->global_seq_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void con_out_kvec_reset(struct ceph_connection *con)
|
|
{
|
|
con->out_kvec_left = 0;
|
|
con->out_kvec_bytes = 0;
|
|
con->out_kvec_cur = &con->out_kvec[0];
|
|
}
|
|
|
|
static void con_out_kvec_add(struct ceph_connection *con,
|
|
size_t size, void *data)
|
|
{
|
|
int index;
|
|
|
|
index = con->out_kvec_left;
|
|
BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
|
|
|
|
con->out_kvec[index].iov_len = size;
|
|
con->out_kvec[index].iov_base = data;
|
|
con->out_kvec_left++;
|
|
con->out_kvec_bytes += size;
|
|
}
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
|
|
{
|
|
if (!bio) {
|
|
*iter = NULL;
|
|
*seg = 0;
|
|
return;
|
|
}
|
|
*iter = bio;
|
|
*seg = bio->bi_idx;
|
|
}
|
|
|
|
static void iter_bio_next(struct bio **bio_iter, int *seg)
|
|
{
|
|
if (*bio_iter == NULL)
|
|
return;
|
|
|
|
BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
|
|
|
|
(*seg)++;
|
|
if (*seg == (*bio_iter)->bi_vcnt)
|
|
init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
|
|
}
|
|
#endif
|
|
|
|
static void prepare_write_message_data(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *msg = con->out_msg;
|
|
|
|
BUG_ON(!msg);
|
|
BUG_ON(!msg->hdr.data_len);
|
|
|
|
/* initialize page iterator */
|
|
con->out_msg_pos.page = 0;
|
|
if (msg->pages)
|
|
con->out_msg_pos.page_pos = msg->page_alignment;
|
|
else
|
|
con->out_msg_pos.page_pos = 0;
|
|
#ifdef CONFIG_BLOCK
|
|
if (msg->bio)
|
|
init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
|
|
#endif
|
|
con->out_msg_pos.data_pos = 0;
|
|
con->out_msg_pos.did_page_crc = false;
|
|
con->out_more = 1; /* data + footer will follow */
|
|
}
|
|
|
|
/*
|
|
* Prepare footer for currently outgoing message, and finish things
|
|
* off. Assumes out_kvec* are already valid.. we just add on to the end.
|
|
*/
|
|
static void prepare_write_message_footer(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *m = con->out_msg;
|
|
int v = con->out_kvec_left;
|
|
|
|
m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
|
|
|
|
dout("prepare_write_message_footer %p\n", con);
|
|
con->out_kvec_is_msg = true;
|
|
con->out_kvec[v].iov_base = &m->footer;
|
|
con->out_kvec[v].iov_len = sizeof(m->footer);
|
|
con->out_kvec_bytes += sizeof(m->footer);
|
|
con->out_kvec_left++;
|
|
con->out_more = m->more_to_follow;
|
|
con->out_msg_done = true;
|
|
}
|
|
|
|
/*
|
|
* Prepare headers for the next outgoing message.
|
|
*/
|
|
static void prepare_write_message(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *m;
|
|
u32 crc;
|
|
|
|
con_out_kvec_reset(con);
|
|
con->out_kvec_is_msg = true;
|
|
con->out_msg_done = false;
|
|
|
|
/* Sneak an ack in there first? If we can get it into the same
|
|
* TCP packet that's a good thing. */
|
|
if (con->in_seq > con->in_seq_acked) {
|
|
con->in_seq_acked = con->in_seq;
|
|
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
|
|
con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
|
|
con_out_kvec_add(con, sizeof (con->out_temp_ack),
|
|
&con->out_temp_ack);
|
|
}
|
|
|
|
BUG_ON(list_empty(&con->out_queue));
|
|
m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
|
|
con->out_msg = m;
|
|
BUG_ON(m->con != con);
|
|
|
|
/* put message on sent list */
|
|
ceph_msg_get(m);
|
|
list_move_tail(&m->list_head, &con->out_sent);
|
|
|
|
/*
|
|
* only assign outgoing seq # if we haven't sent this message
|
|
* yet. if it is requeued, resend with it's original seq.
|
|
*/
|
|
if (m->needs_out_seq) {
|
|
m->hdr.seq = cpu_to_le64(++con->out_seq);
|
|
m->needs_out_seq = false;
|
|
}
|
|
#ifdef CONFIG_BLOCK
|
|
else
|
|
m->bio_iter = NULL;
|
|
#endif
|
|
|
|
dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
|
|
m, con->out_seq, le16_to_cpu(m->hdr.type),
|
|
le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
|
|
le32_to_cpu(m->hdr.data_len),
|
|
m->nr_pages);
|
|
BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
|
|
|
|
/* tag + hdr + front + middle */
|
|
con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
|
|
con_out_kvec_add(con, sizeof (m->hdr), &m->hdr);
|
|
con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
|
|
|
|
if (m->middle)
|
|
con_out_kvec_add(con, m->middle->vec.iov_len,
|
|
m->middle->vec.iov_base);
|
|
|
|
/* fill in crc (except data pages), footer */
|
|
crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
|
|
con->out_msg->hdr.crc = cpu_to_le32(crc);
|
|
con->out_msg->footer.flags = 0;
|
|
|
|
crc = crc32c(0, m->front.iov_base, m->front.iov_len);
|
|
con->out_msg->footer.front_crc = cpu_to_le32(crc);
|
|
if (m->middle) {
|
|
crc = crc32c(0, m->middle->vec.iov_base,
|
|
m->middle->vec.iov_len);
|
|
con->out_msg->footer.middle_crc = cpu_to_le32(crc);
|
|
} else
|
|
con->out_msg->footer.middle_crc = 0;
|
|
dout("%s front_crc %u middle_crc %u\n", __func__,
|
|
le32_to_cpu(con->out_msg->footer.front_crc),
|
|
le32_to_cpu(con->out_msg->footer.middle_crc));
|
|
|
|
/* is there a data payload? */
|
|
con->out_msg->footer.data_crc = 0;
|
|
if (m->hdr.data_len)
|
|
prepare_write_message_data(con);
|
|
else
|
|
/* no, queue up footer too and be done */
|
|
prepare_write_message_footer(con);
|
|
|
|
set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
}
|
|
|
|
/*
|
|
* Prepare an ack.
|
|
*/
|
|
static void prepare_write_ack(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_write_ack %p %llu -> %llu\n", con,
|
|
con->in_seq_acked, con->in_seq);
|
|
con->in_seq_acked = con->in_seq;
|
|
|
|
con_out_kvec_reset(con);
|
|
|
|
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
|
|
|
|
con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
|
|
con_out_kvec_add(con, sizeof (con->out_temp_ack),
|
|
&con->out_temp_ack);
|
|
|
|
con->out_more = 1; /* more will follow.. eventually.. */
|
|
set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
}
|
|
|
|
/*
|
|
* Prepare to write keepalive byte.
|
|
*/
|
|
static void prepare_write_keepalive(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_write_keepalive %p\n", con);
|
|
con_out_kvec_reset(con);
|
|
con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive);
|
|
set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
}
|
|
|
|
/*
|
|
* Connection negotiation.
|
|
*/
|
|
|
|
static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
|
|
int *auth_proto)
|
|
{
|
|
struct ceph_auth_handshake *auth;
|
|
|
|
if (!con->ops->get_authorizer) {
|
|
con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
|
|
con->out_connect.authorizer_len = 0;
|
|
return NULL;
|
|
}
|
|
|
|
/* Can't hold the mutex while getting authorizer */
|
|
mutex_unlock(&con->mutex);
|
|
auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
|
|
mutex_lock(&con->mutex);
|
|
|
|
if (IS_ERR(auth))
|
|
return auth;
|
|
if (con->state != CON_STATE_NEGOTIATING)
|
|
return ERR_PTR(-EAGAIN);
|
|
|
|
con->auth_reply_buf = auth->authorizer_reply_buf;
|
|
con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
|
|
return auth;
|
|
}
|
|
|
|
/*
|
|
* We connected to a peer and are saying hello.
|
|
*/
|
|
static void prepare_write_banner(struct ceph_connection *con)
|
|
{
|
|
con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
|
|
con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
|
|
&con->msgr->my_enc_addr);
|
|
|
|
con->out_more = 0;
|
|
set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
}
|
|
|
|
static int prepare_write_connect(struct ceph_connection *con)
|
|
{
|
|
unsigned int global_seq = get_global_seq(con->msgr, 0);
|
|
int proto;
|
|
int auth_proto;
|
|
struct ceph_auth_handshake *auth;
|
|
|
|
switch (con->peer_name.type) {
|
|
case CEPH_ENTITY_TYPE_MON:
|
|
proto = CEPH_MONC_PROTOCOL;
|
|
break;
|
|
case CEPH_ENTITY_TYPE_OSD:
|
|
proto = CEPH_OSDC_PROTOCOL;
|
|
break;
|
|
case CEPH_ENTITY_TYPE_MDS:
|
|
proto = CEPH_MDSC_PROTOCOL;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
|
|
con->connect_seq, global_seq, proto);
|
|
|
|
con->out_connect.features = cpu_to_le64(con->msgr->supported_features);
|
|
con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
|
|
con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
|
|
con->out_connect.global_seq = cpu_to_le32(global_seq);
|
|
con->out_connect.protocol_version = cpu_to_le32(proto);
|
|
con->out_connect.flags = 0;
|
|
|
|
auth_proto = CEPH_AUTH_UNKNOWN;
|
|
auth = get_connect_authorizer(con, &auth_proto);
|
|
if (IS_ERR(auth))
|
|
return PTR_ERR(auth);
|
|
|
|
con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
|
|
con->out_connect.authorizer_len = auth ?
|
|
cpu_to_le32(auth->authorizer_buf_len) : 0;
|
|
|
|
con_out_kvec_add(con, sizeof (con->out_connect),
|
|
&con->out_connect);
|
|
if (auth && auth->authorizer_buf_len)
|
|
con_out_kvec_add(con, auth->authorizer_buf_len,
|
|
auth->authorizer_buf);
|
|
|
|
con->out_more = 0;
|
|
set_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* write as much of pending kvecs to the socket as we can.
|
|
* 1 -> done
|
|
* 0 -> socket full, but more to do
|
|
* <0 -> error
|
|
*/
|
|
static int write_partial_kvec(struct ceph_connection *con)
|
|
{
|
|
int ret;
|
|
|
|
dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
|
|
while (con->out_kvec_bytes > 0) {
|
|
ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
|
|
con->out_kvec_left, con->out_kvec_bytes,
|
|
con->out_more);
|
|
if (ret <= 0)
|
|
goto out;
|
|
con->out_kvec_bytes -= ret;
|
|
if (con->out_kvec_bytes == 0)
|
|
break; /* done */
|
|
|
|
/* account for full iov entries consumed */
|
|
while (ret >= con->out_kvec_cur->iov_len) {
|
|
BUG_ON(!con->out_kvec_left);
|
|
ret -= con->out_kvec_cur->iov_len;
|
|
con->out_kvec_cur++;
|
|
con->out_kvec_left--;
|
|
}
|
|
/* and for a partially-consumed entry */
|
|
if (ret) {
|
|
con->out_kvec_cur->iov_len -= ret;
|
|
con->out_kvec_cur->iov_base += ret;
|
|
}
|
|
}
|
|
con->out_kvec_left = 0;
|
|
con->out_kvec_is_msg = false;
|
|
ret = 1;
|
|
out:
|
|
dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
|
|
con->out_kvec_bytes, con->out_kvec_left, ret);
|
|
return ret; /* done! */
|
|
}
|
|
|
|
static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
|
|
size_t len, size_t sent, bool in_trail)
|
|
{
|
|
struct ceph_msg *msg = con->out_msg;
|
|
|
|
BUG_ON(!msg);
|
|
BUG_ON(!sent);
|
|
|
|
con->out_msg_pos.data_pos += sent;
|
|
con->out_msg_pos.page_pos += sent;
|
|
if (sent < len)
|
|
return;
|
|
|
|
BUG_ON(sent != len);
|
|
con->out_msg_pos.page_pos = 0;
|
|
con->out_msg_pos.page++;
|
|
con->out_msg_pos.did_page_crc = false;
|
|
if (in_trail)
|
|
list_move_tail(&page->lru,
|
|
&msg->trail->head);
|
|
else if (msg->pagelist)
|
|
list_move_tail(&page->lru,
|
|
&msg->pagelist->head);
|
|
#ifdef CONFIG_BLOCK
|
|
else if (msg->bio)
|
|
iter_bio_next(&msg->bio_iter, &msg->bio_seg);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Write as much message data payload as we can. If we finish, queue
|
|
* up the footer.
|
|
* 1 -> done, footer is now queued in out_kvec[].
|
|
* 0 -> socket full, but more to do
|
|
* <0 -> error
|
|
*/
|
|
static int write_partial_msg_pages(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *msg = con->out_msg;
|
|
unsigned int data_len = le32_to_cpu(msg->hdr.data_len);
|
|
size_t len;
|
|
bool do_datacrc = !con->msgr->nocrc;
|
|
int ret;
|
|
int total_max_write;
|
|
bool in_trail = false;
|
|
const size_t trail_len = (msg->trail ? msg->trail->length : 0);
|
|
const size_t trail_off = data_len - trail_len;
|
|
|
|
dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
|
|
con, msg, con->out_msg_pos.page, msg->nr_pages,
|
|
con->out_msg_pos.page_pos);
|
|
|
|
/*
|
|
* Iterate through each page that contains data to be
|
|
* written, and send as much as possible for each.
|
|
*
|
|
* If we are calculating the data crc (the default), we will
|
|
* need to map the page. If we have no pages, they have
|
|
* been revoked, so use the zero page.
|
|
*/
|
|
while (data_len > con->out_msg_pos.data_pos) {
|
|
struct page *page = NULL;
|
|
int max_write = PAGE_SIZE;
|
|
int bio_offset = 0;
|
|
|
|
in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off;
|
|
if (!in_trail)
|
|
total_max_write = trail_off - con->out_msg_pos.data_pos;
|
|
|
|
if (in_trail) {
|
|
total_max_write = data_len - con->out_msg_pos.data_pos;
|
|
|
|
page = list_first_entry(&msg->trail->head,
|
|
struct page, lru);
|
|
} else if (msg->pages) {
|
|
page = msg->pages[con->out_msg_pos.page];
|
|
} else if (msg->pagelist) {
|
|
page = list_first_entry(&msg->pagelist->head,
|
|
struct page, lru);
|
|
#ifdef CONFIG_BLOCK
|
|
} else if (msg->bio) {
|
|
struct bio_vec *bv;
|
|
|
|
bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
|
|
page = bv->bv_page;
|
|
bio_offset = bv->bv_offset;
|
|
max_write = bv->bv_len;
|
|
#endif
|
|
} else {
|
|
page = zero_page;
|
|
}
|
|
len = min_t(int, max_write - con->out_msg_pos.page_pos,
|
|
total_max_write);
|
|
|
|
if (do_datacrc && !con->out_msg_pos.did_page_crc) {
|
|
void *base;
|
|
u32 crc = le32_to_cpu(msg->footer.data_crc);
|
|
char *kaddr;
|
|
|
|
kaddr = kmap(page);
|
|
BUG_ON(kaddr == NULL);
|
|
base = kaddr + con->out_msg_pos.page_pos + bio_offset;
|
|
crc = crc32c(crc, base, len);
|
|
kunmap(page);
|
|
msg->footer.data_crc = cpu_to_le32(crc);
|
|
con->out_msg_pos.did_page_crc = true;
|
|
}
|
|
ret = ceph_tcp_sendpage(con->sock, page,
|
|
con->out_msg_pos.page_pos + bio_offset,
|
|
len, 1);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
|
|
}
|
|
|
|
dout("write_partial_msg_pages %p msg %p done\n", con, msg);
|
|
|
|
/* prepare and queue up footer, too */
|
|
if (!do_datacrc)
|
|
msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
|
|
con_out_kvec_reset(con);
|
|
prepare_write_message_footer(con);
|
|
ret = 1;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* write some zeros
|
|
*/
|
|
static int write_partial_skip(struct ceph_connection *con)
|
|
{
|
|
int ret;
|
|
|
|
while (con->out_skip > 0) {
|
|
size_t size = min(con->out_skip, (int) PAGE_CACHE_SIZE);
|
|
|
|
ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, 1);
|
|
if (ret <= 0)
|
|
goto out;
|
|
con->out_skip -= ret;
|
|
}
|
|
ret = 1;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Prepare to read connection handshake, or an ack.
|
|
*/
|
|
static void prepare_read_banner(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_read_banner %p\n", con);
|
|
con->in_base_pos = 0;
|
|
}
|
|
|
|
static void prepare_read_connect(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_read_connect %p\n", con);
|
|
con->in_base_pos = 0;
|
|
}
|
|
|
|
static void prepare_read_ack(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_read_ack %p\n", con);
|
|
con->in_base_pos = 0;
|
|
}
|
|
|
|
static void prepare_read_tag(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_read_tag %p\n", con);
|
|
con->in_base_pos = 0;
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
}
|
|
|
|
/*
|
|
* Prepare to read a message.
|
|
*/
|
|
static int prepare_read_message(struct ceph_connection *con)
|
|
{
|
|
dout("prepare_read_message %p\n", con);
|
|
BUG_ON(con->in_msg != NULL);
|
|
con->in_base_pos = 0;
|
|
con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int read_partial(struct ceph_connection *con,
|
|
int end, int size, void *object)
|
|
{
|
|
while (con->in_base_pos < end) {
|
|
int left = end - con->in_base_pos;
|
|
int have = size - left;
|
|
int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
|
|
if (ret <= 0)
|
|
return ret;
|
|
con->in_base_pos += ret;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Read all or part of the connect-side handshake on a new connection
|
|
*/
|
|
static int read_partial_banner(struct ceph_connection *con)
|
|
{
|
|
int size;
|
|
int end;
|
|
int ret;
|
|
|
|
dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
|
|
|
|
/* peer's banner */
|
|
size = strlen(CEPH_BANNER);
|
|
end = size;
|
|
ret = read_partial(con, end, size, con->in_banner);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
size = sizeof (con->actual_peer_addr);
|
|
end += size;
|
|
ret = read_partial(con, end, size, &con->actual_peer_addr);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
size = sizeof (con->peer_addr_for_me);
|
|
end += size;
|
|
ret = read_partial(con, end, size, &con->peer_addr_for_me);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int read_partial_connect(struct ceph_connection *con)
|
|
{
|
|
int size;
|
|
int end;
|
|
int ret;
|
|
|
|
dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
|
|
|
|
size = sizeof (con->in_reply);
|
|
end = size;
|
|
ret = read_partial(con, end, size, &con->in_reply);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
size = le32_to_cpu(con->in_reply.authorizer_len);
|
|
end += size;
|
|
ret = read_partial(con, end, size, con->auth_reply_buf);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
|
|
con, (int)con->in_reply.tag,
|
|
le32_to_cpu(con->in_reply.connect_seq),
|
|
le32_to_cpu(con->in_reply.global_seq));
|
|
out:
|
|
return ret;
|
|
|
|
}
|
|
|
|
/*
|
|
* Verify the hello banner looks okay.
|
|
*/
|
|
static int verify_hello(struct ceph_connection *con)
|
|
{
|
|
if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
|
|
pr_err("connect to %s got bad banner\n",
|
|
ceph_pr_addr(&con->peer_addr.in_addr));
|
|
con->error_msg = "protocol error, bad banner";
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool addr_is_blank(struct sockaddr_storage *ss)
|
|
{
|
|
switch (ss->ss_family) {
|
|
case AF_INET:
|
|
return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
|
|
case AF_INET6:
|
|
return
|
|
((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
|
|
((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
|
|
((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
|
|
((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int addr_port(struct sockaddr_storage *ss)
|
|
{
|
|
switch (ss->ss_family) {
|
|
case AF_INET:
|
|
return ntohs(((struct sockaddr_in *)ss)->sin_port);
|
|
case AF_INET6:
|
|
return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void addr_set_port(struct sockaddr_storage *ss, int p)
|
|
{
|
|
switch (ss->ss_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)ss)->sin_port = htons(p);
|
|
break;
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unlike other *_pton function semantics, zero indicates success.
|
|
*/
|
|
static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
|
|
char delim, const char **ipend)
|
|
{
|
|
struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
|
|
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
|
|
|
|
memset(ss, 0, sizeof(*ss));
|
|
|
|
if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
|
|
ss->ss_family = AF_INET;
|
|
return 0;
|
|
}
|
|
|
|
if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
|
|
ss->ss_family = AF_INET6;
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Extract hostname string and resolve using kernel DNS facility.
|
|
*/
|
|
#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
|
|
static int ceph_dns_resolve_name(const char *name, size_t namelen,
|
|
struct sockaddr_storage *ss, char delim, const char **ipend)
|
|
{
|
|
const char *end, *delim_p;
|
|
char *colon_p, *ip_addr = NULL;
|
|
int ip_len, ret;
|
|
|
|
/*
|
|
* The end of the hostname occurs immediately preceding the delimiter or
|
|
* the port marker (':') where the delimiter takes precedence.
|
|
*/
|
|
delim_p = memchr(name, delim, namelen);
|
|
colon_p = memchr(name, ':', namelen);
|
|
|
|
if (delim_p && colon_p)
|
|
end = delim_p < colon_p ? delim_p : colon_p;
|
|
else if (!delim_p && colon_p)
|
|
end = colon_p;
|
|
else {
|
|
end = delim_p;
|
|
if (!end) /* case: hostname:/ */
|
|
end = name + namelen;
|
|
}
|
|
|
|
if (end <= name)
|
|
return -EINVAL;
|
|
|
|
/* do dns_resolve upcall */
|
|
ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
|
|
if (ip_len > 0)
|
|
ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
|
|
else
|
|
ret = -ESRCH;
|
|
|
|
kfree(ip_addr);
|
|
|
|
*ipend = end;
|
|
|
|
pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
|
|
ret, ret ? "failed" : ceph_pr_addr(ss));
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
|
|
struct sockaddr_storage *ss, char delim, const char **ipend)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Parse a server name (IP or hostname). If a valid IP address is not found
|
|
* then try to extract a hostname to resolve using userspace DNS upcall.
|
|
*/
|
|
static int ceph_parse_server_name(const char *name, size_t namelen,
|
|
struct sockaddr_storage *ss, char delim, const char **ipend)
|
|
{
|
|
int ret;
|
|
|
|
ret = ceph_pton(name, namelen, ss, delim, ipend);
|
|
if (ret)
|
|
ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Parse an ip[:port] list into an addr array. Use the default
|
|
* monitor port if a port isn't specified.
|
|
*/
|
|
int ceph_parse_ips(const char *c, const char *end,
|
|
struct ceph_entity_addr *addr,
|
|
int max_count, int *count)
|
|
{
|
|
int i, ret = -EINVAL;
|
|
const char *p = c;
|
|
|
|
dout("parse_ips on '%.*s'\n", (int)(end-c), c);
|
|
for (i = 0; i < max_count; i++) {
|
|
const char *ipend;
|
|
struct sockaddr_storage *ss = &addr[i].in_addr;
|
|
int port;
|
|
char delim = ',';
|
|
|
|
if (*p == '[') {
|
|
delim = ']';
|
|
p++;
|
|
}
|
|
|
|
ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
|
|
if (ret)
|
|
goto bad;
|
|
ret = -EINVAL;
|
|
|
|
p = ipend;
|
|
|
|
if (delim == ']') {
|
|
if (*p != ']') {
|
|
dout("missing matching ']'\n");
|
|
goto bad;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
/* port? */
|
|
if (p < end && *p == ':') {
|
|
port = 0;
|
|
p++;
|
|
while (p < end && *p >= '0' && *p <= '9') {
|
|
port = (port * 10) + (*p - '0');
|
|
p++;
|
|
}
|
|
if (port > 65535 || port == 0)
|
|
goto bad;
|
|
} else {
|
|
port = CEPH_MON_PORT;
|
|
}
|
|
|
|
addr_set_port(ss, port);
|
|
|
|
dout("parse_ips got %s\n", ceph_pr_addr(ss));
|
|
|
|
if (p == end)
|
|
break;
|
|
if (*p != ',')
|
|
goto bad;
|
|
p++;
|
|
}
|
|
|
|
if (p != end)
|
|
goto bad;
|
|
|
|
if (count)
|
|
*count = i + 1;
|
|
return 0;
|
|
|
|
bad:
|
|
pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ceph_parse_ips);
|
|
|
|
static int process_banner(struct ceph_connection *con)
|
|
{
|
|
dout("process_banner on %p\n", con);
|
|
|
|
if (verify_hello(con) < 0)
|
|
return -1;
|
|
|
|
ceph_decode_addr(&con->actual_peer_addr);
|
|
ceph_decode_addr(&con->peer_addr_for_me);
|
|
|
|
/*
|
|
* Make sure the other end is who we wanted. note that the other
|
|
* end may not yet know their ip address, so if it's 0.0.0.0, give
|
|
* them the benefit of the doubt.
|
|
*/
|
|
if (memcmp(&con->peer_addr, &con->actual_peer_addr,
|
|
sizeof(con->peer_addr)) != 0 &&
|
|
!(addr_is_blank(&con->actual_peer_addr.in_addr) &&
|
|
con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
|
|
pr_warning("wrong peer, want %s/%d, got %s/%d\n",
|
|
ceph_pr_addr(&con->peer_addr.in_addr),
|
|
(int)le32_to_cpu(con->peer_addr.nonce),
|
|
ceph_pr_addr(&con->actual_peer_addr.in_addr),
|
|
(int)le32_to_cpu(con->actual_peer_addr.nonce));
|
|
con->error_msg = "wrong peer at address";
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* did we learn our address?
|
|
*/
|
|
if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
|
|
int port = addr_port(&con->msgr->inst.addr.in_addr);
|
|
|
|
memcpy(&con->msgr->inst.addr.in_addr,
|
|
&con->peer_addr_for_me.in_addr,
|
|
sizeof(con->peer_addr_for_me.in_addr));
|
|
addr_set_port(&con->msgr->inst.addr.in_addr, port);
|
|
encode_my_addr(con->msgr);
|
|
dout("process_banner learned my addr is %s\n",
|
|
ceph_pr_addr(&con->msgr->inst.addr.in_addr));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_connect(struct ceph_connection *con)
|
|
{
|
|
u64 sup_feat = con->msgr->supported_features;
|
|
u64 req_feat = con->msgr->required_features;
|
|
u64 server_feat = le64_to_cpu(con->in_reply.features);
|
|
int ret;
|
|
|
|
dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
|
|
|
|
switch (con->in_reply.tag) {
|
|
case CEPH_MSGR_TAG_FEATURES:
|
|
pr_err("%s%lld %s feature set mismatch,"
|
|
" my %llx < server's %llx, missing %llx\n",
|
|
ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr),
|
|
sup_feat, server_feat, server_feat & ~sup_feat);
|
|
con->error_msg = "missing required protocol features";
|
|
reset_connection(con);
|
|
return -1;
|
|
|
|
case CEPH_MSGR_TAG_BADPROTOVER:
|
|
pr_err("%s%lld %s protocol version mismatch,"
|
|
" my %d != server's %d\n",
|
|
ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr),
|
|
le32_to_cpu(con->out_connect.protocol_version),
|
|
le32_to_cpu(con->in_reply.protocol_version));
|
|
con->error_msg = "protocol version mismatch";
|
|
reset_connection(con);
|
|
return -1;
|
|
|
|
case CEPH_MSGR_TAG_BADAUTHORIZER:
|
|
con->auth_retry++;
|
|
dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
|
|
con->auth_retry);
|
|
if (con->auth_retry == 2) {
|
|
con->error_msg = "connect authorization failure";
|
|
return -1;
|
|
}
|
|
con->auth_retry = 1;
|
|
con_out_kvec_reset(con);
|
|
ret = prepare_write_connect(con);
|
|
if (ret < 0)
|
|
return ret;
|
|
prepare_read_connect(con);
|
|
break;
|
|
|
|
case CEPH_MSGR_TAG_RESETSESSION:
|
|
/*
|
|
* If we connected with a large connect_seq but the peer
|
|
* has no record of a session with us (no connection, or
|
|
* connect_seq == 0), they will send RESETSESION to indicate
|
|
* that they must have reset their session, and may have
|
|
* dropped messages.
|
|
*/
|
|
dout("process_connect got RESET peer seq %u\n",
|
|
le32_to_cpu(con->in_reply.connect_seq));
|
|
pr_err("%s%lld %s connection reset\n",
|
|
ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr));
|
|
reset_connection(con);
|
|
con_out_kvec_reset(con);
|
|
ret = prepare_write_connect(con);
|
|
if (ret < 0)
|
|
return ret;
|
|
prepare_read_connect(con);
|
|
|
|
/* Tell ceph about it. */
|
|
mutex_unlock(&con->mutex);
|
|
pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
|
|
if (con->ops->peer_reset)
|
|
con->ops->peer_reset(con);
|
|
mutex_lock(&con->mutex);
|
|
if (con->state != CON_STATE_NEGOTIATING)
|
|
return -EAGAIN;
|
|
break;
|
|
|
|
case CEPH_MSGR_TAG_RETRY_SESSION:
|
|
/*
|
|
* If we sent a smaller connect_seq than the peer has, try
|
|
* again with a larger value.
|
|
*/
|
|
dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
|
|
le32_to_cpu(con->out_connect.connect_seq),
|
|
le32_to_cpu(con->in_reply.connect_seq));
|
|
con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
|
|
con_out_kvec_reset(con);
|
|
ret = prepare_write_connect(con);
|
|
if (ret < 0)
|
|
return ret;
|
|
prepare_read_connect(con);
|
|
break;
|
|
|
|
case CEPH_MSGR_TAG_RETRY_GLOBAL:
|
|
/*
|
|
* If we sent a smaller global_seq than the peer has, try
|
|
* again with a larger value.
|
|
*/
|
|
dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
|
|
con->peer_global_seq,
|
|
le32_to_cpu(con->in_reply.global_seq));
|
|
get_global_seq(con->msgr,
|
|
le32_to_cpu(con->in_reply.global_seq));
|
|
con_out_kvec_reset(con);
|
|
ret = prepare_write_connect(con);
|
|
if (ret < 0)
|
|
return ret;
|
|
prepare_read_connect(con);
|
|
break;
|
|
|
|
case CEPH_MSGR_TAG_READY:
|
|
if (req_feat & ~server_feat) {
|
|
pr_err("%s%lld %s protocol feature mismatch,"
|
|
" my required %llx > server's %llx, need %llx\n",
|
|
ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr),
|
|
req_feat, server_feat, req_feat & ~server_feat);
|
|
con->error_msg = "missing required protocol features";
|
|
reset_connection(con);
|
|
return -1;
|
|
}
|
|
|
|
WARN_ON(con->state != CON_STATE_NEGOTIATING);
|
|
con->state = CON_STATE_OPEN;
|
|
|
|
con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
|
|
con->connect_seq++;
|
|
con->peer_features = server_feat;
|
|
dout("process_connect got READY gseq %d cseq %d (%d)\n",
|
|
con->peer_global_seq,
|
|
le32_to_cpu(con->in_reply.connect_seq),
|
|
con->connect_seq);
|
|
WARN_ON(con->connect_seq !=
|
|
le32_to_cpu(con->in_reply.connect_seq));
|
|
|
|
if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
|
|
set_bit(CON_FLAG_LOSSYTX, &con->flags);
|
|
|
|
con->delay = 0; /* reset backoff memory */
|
|
|
|
prepare_read_tag(con);
|
|
break;
|
|
|
|
case CEPH_MSGR_TAG_WAIT:
|
|
/*
|
|
* If there is a connection race (we are opening
|
|
* connections to each other), one of us may just have
|
|
* to WAIT. This shouldn't happen if we are the
|
|
* client.
|
|
*/
|
|
pr_err("process_connect got WAIT as client\n");
|
|
con->error_msg = "protocol error, got WAIT as client";
|
|
return -1;
|
|
|
|
default:
|
|
pr_err("connect protocol error, will retry\n");
|
|
con->error_msg = "protocol error, garbage tag during connect";
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* read (part of) an ack
|
|
*/
|
|
static int read_partial_ack(struct ceph_connection *con)
|
|
{
|
|
int size = sizeof (con->in_temp_ack);
|
|
int end = size;
|
|
|
|
return read_partial(con, end, size, &con->in_temp_ack);
|
|
}
|
|
|
|
|
|
/*
|
|
* We can finally discard anything that's been acked.
|
|
*/
|
|
static void process_ack(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *m;
|
|
u64 ack = le64_to_cpu(con->in_temp_ack);
|
|
u64 seq;
|
|
|
|
while (!list_empty(&con->out_sent)) {
|
|
m = list_first_entry(&con->out_sent, struct ceph_msg,
|
|
list_head);
|
|
seq = le64_to_cpu(m->hdr.seq);
|
|
if (seq > ack)
|
|
break;
|
|
dout("got ack for seq %llu type %d at %p\n", seq,
|
|
le16_to_cpu(m->hdr.type), m);
|
|
m->ack_stamp = jiffies;
|
|
ceph_msg_remove(m);
|
|
}
|
|
prepare_read_tag(con);
|
|
}
|
|
|
|
|
|
|
|
|
|
static int read_partial_message_section(struct ceph_connection *con,
|
|
struct kvec *section,
|
|
unsigned int sec_len, u32 *crc)
|
|
{
|
|
int ret, left;
|
|
|
|
BUG_ON(!section);
|
|
|
|
while (section->iov_len < sec_len) {
|
|
BUG_ON(section->iov_base == NULL);
|
|
left = sec_len - section->iov_len;
|
|
ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
|
|
section->iov_len, left);
|
|
if (ret <= 0)
|
|
return ret;
|
|
section->iov_len += ret;
|
|
}
|
|
if (section->iov_len == sec_len)
|
|
*crc = crc32c(0, section->iov_base, section->iov_len);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
|
|
|
|
static int read_partial_message_pages(struct ceph_connection *con,
|
|
struct page **pages,
|
|
unsigned int data_len, bool do_datacrc)
|
|
{
|
|
void *p;
|
|
int ret;
|
|
int left;
|
|
|
|
left = min((int)(data_len - con->in_msg_pos.data_pos),
|
|
(int)(PAGE_SIZE - con->in_msg_pos.page_pos));
|
|
/* (page) data */
|
|
BUG_ON(pages == NULL);
|
|
p = kmap(pages[con->in_msg_pos.page]);
|
|
ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
|
|
left);
|
|
if (ret > 0 && do_datacrc)
|
|
con->in_data_crc =
|
|
crc32c(con->in_data_crc,
|
|
p + con->in_msg_pos.page_pos, ret);
|
|
kunmap(pages[con->in_msg_pos.page]);
|
|
if (ret <= 0)
|
|
return ret;
|
|
con->in_msg_pos.data_pos += ret;
|
|
con->in_msg_pos.page_pos += ret;
|
|
if (con->in_msg_pos.page_pos == PAGE_SIZE) {
|
|
con->in_msg_pos.page_pos = 0;
|
|
con->in_msg_pos.page++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
static int read_partial_message_bio(struct ceph_connection *con,
|
|
struct bio **bio_iter, int *bio_seg,
|
|
unsigned int data_len, bool do_datacrc)
|
|
{
|
|
struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
|
|
void *p;
|
|
int ret, left;
|
|
|
|
left = min((int)(data_len - con->in_msg_pos.data_pos),
|
|
(int)(bv->bv_len - con->in_msg_pos.page_pos));
|
|
|
|
p = kmap(bv->bv_page) + bv->bv_offset;
|
|
|
|
ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
|
|
left);
|
|
if (ret > 0 && do_datacrc)
|
|
con->in_data_crc =
|
|
crc32c(con->in_data_crc,
|
|
p + con->in_msg_pos.page_pos, ret);
|
|
kunmap(bv->bv_page);
|
|
if (ret <= 0)
|
|
return ret;
|
|
con->in_msg_pos.data_pos += ret;
|
|
con->in_msg_pos.page_pos += ret;
|
|
if (con->in_msg_pos.page_pos == bv->bv_len) {
|
|
con->in_msg_pos.page_pos = 0;
|
|
iter_bio_next(bio_iter, bio_seg);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* read (part of) a message.
|
|
*/
|
|
static int read_partial_message(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *m = con->in_msg;
|
|
int size;
|
|
int end;
|
|
int ret;
|
|
unsigned int front_len, middle_len, data_len;
|
|
bool do_datacrc = !con->msgr->nocrc;
|
|
u64 seq;
|
|
u32 crc;
|
|
|
|
dout("read_partial_message con %p msg %p\n", con, m);
|
|
|
|
/* header */
|
|
size = sizeof (con->in_hdr);
|
|
end = size;
|
|
ret = read_partial(con, end, size, &con->in_hdr);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
|
|
if (cpu_to_le32(crc) != con->in_hdr.crc) {
|
|
pr_err("read_partial_message bad hdr "
|
|
" crc %u != expected %u\n",
|
|
crc, con->in_hdr.crc);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
front_len = le32_to_cpu(con->in_hdr.front_len);
|
|
if (front_len > CEPH_MSG_MAX_FRONT_LEN)
|
|
return -EIO;
|
|
middle_len = le32_to_cpu(con->in_hdr.middle_len);
|
|
if (middle_len > CEPH_MSG_MAX_DATA_LEN)
|
|
return -EIO;
|
|
data_len = le32_to_cpu(con->in_hdr.data_len);
|
|
if (data_len > CEPH_MSG_MAX_DATA_LEN)
|
|
return -EIO;
|
|
|
|
/* verify seq# */
|
|
seq = le64_to_cpu(con->in_hdr.seq);
|
|
if ((s64)seq - (s64)con->in_seq < 1) {
|
|
pr_info("skipping %s%lld %s seq %lld expected %lld\n",
|
|
ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr),
|
|
seq, con->in_seq + 1);
|
|
con->in_base_pos = -front_len - middle_len - data_len -
|
|
sizeof(m->footer);
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
return 0;
|
|
} else if ((s64)seq - (s64)con->in_seq > 1) {
|
|
pr_err("read_partial_message bad seq %lld expected %lld\n",
|
|
seq, con->in_seq + 1);
|
|
con->error_msg = "bad message sequence # for incoming message";
|
|
return -EBADMSG;
|
|
}
|
|
|
|
/* allocate message? */
|
|
if (!con->in_msg) {
|
|
int skip = 0;
|
|
|
|
dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
|
|
con->in_hdr.front_len, con->in_hdr.data_len);
|
|
ret = ceph_con_in_msg_alloc(con, &skip);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (skip) {
|
|
/* skip this message */
|
|
dout("alloc_msg said skip message\n");
|
|
BUG_ON(con->in_msg);
|
|
con->in_base_pos = -front_len - middle_len - data_len -
|
|
sizeof(m->footer);
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
con->in_seq++;
|
|
return 0;
|
|
}
|
|
|
|
BUG_ON(!con->in_msg);
|
|
BUG_ON(con->in_msg->con != con);
|
|
m = con->in_msg;
|
|
m->front.iov_len = 0; /* haven't read it yet */
|
|
if (m->middle)
|
|
m->middle->vec.iov_len = 0;
|
|
|
|
con->in_msg_pos.page = 0;
|
|
if (m->pages)
|
|
con->in_msg_pos.page_pos = m->page_alignment;
|
|
else
|
|
con->in_msg_pos.page_pos = 0;
|
|
con->in_msg_pos.data_pos = 0;
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
if (m->bio)
|
|
init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
|
|
#endif
|
|
}
|
|
|
|
/* front */
|
|
ret = read_partial_message_section(con, &m->front, front_len,
|
|
&con->in_front_crc);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
/* middle */
|
|
if (m->middle) {
|
|
ret = read_partial_message_section(con, &m->middle->vec,
|
|
middle_len,
|
|
&con->in_middle_crc);
|
|
if (ret <= 0)
|
|
return ret;
|
|
}
|
|
|
|
/* (page) data */
|
|
while (con->in_msg_pos.data_pos < data_len) {
|
|
if (m->pages) {
|
|
ret = read_partial_message_pages(con, m->pages,
|
|
data_len, do_datacrc);
|
|
if (ret <= 0)
|
|
return ret;
|
|
#ifdef CONFIG_BLOCK
|
|
} else if (m->bio) {
|
|
BUG_ON(!m->bio_iter);
|
|
ret = read_partial_message_bio(con,
|
|
&m->bio_iter, &m->bio_seg,
|
|
data_len, do_datacrc);
|
|
if (ret <= 0)
|
|
return ret;
|
|
#endif
|
|
} else {
|
|
BUG_ON(1);
|
|
}
|
|
}
|
|
|
|
/* footer */
|
|
size = sizeof (m->footer);
|
|
end += size;
|
|
ret = read_partial(con, end, size, &m->footer);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
|
|
m, front_len, m->footer.front_crc, middle_len,
|
|
m->footer.middle_crc, data_len, m->footer.data_crc);
|
|
|
|
/* crc ok? */
|
|
if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
|
|
pr_err("read_partial_message %p front crc %u != exp. %u\n",
|
|
m, con->in_front_crc, m->footer.front_crc);
|
|
return -EBADMSG;
|
|
}
|
|
if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
|
|
pr_err("read_partial_message %p middle crc %u != exp %u\n",
|
|
m, con->in_middle_crc, m->footer.middle_crc);
|
|
return -EBADMSG;
|
|
}
|
|
if (do_datacrc &&
|
|
(m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
|
|
con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
|
|
pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
|
|
con->in_data_crc, le32_to_cpu(m->footer.data_crc));
|
|
return -EBADMSG;
|
|
}
|
|
|
|
return 1; /* done! */
|
|
}
|
|
|
|
/*
|
|
* Process message. This happens in the worker thread. The callback should
|
|
* be careful not to do anything that waits on other incoming messages or it
|
|
* may deadlock.
|
|
*/
|
|
static void process_message(struct ceph_connection *con)
|
|
{
|
|
struct ceph_msg *msg;
|
|
|
|
BUG_ON(con->in_msg->con != con);
|
|
con->in_msg->con = NULL;
|
|
msg = con->in_msg;
|
|
con->in_msg = NULL;
|
|
con->ops->put(con);
|
|
|
|
/* if first message, set peer_name */
|
|
if (con->peer_name.type == 0)
|
|
con->peer_name = msg->hdr.src;
|
|
|
|
con->in_seq++;
|
|
mutex_unlock(&con->mutex);
|
|
|
|
dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
|
|
msg, le64_to_cpu(msg->hdr.seq),
|
|
ENTITY_NAME(msg->hdr.src),
|
|
le16_to_cpu(msg->hdr.type),
|
|
ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
|
|
le32_to_cpu(msg->hdr.front_len),
|
|
le32_to_cpu(msg->hdr.data_len),
|
|
con->in_front_crc, con->in_middle_crc, con->in_data_crc);
|
|
con->ops->dispatch(con, msg);
|
|
|
|
mutex_lock(&con->mutex);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write something to the socket. Called in a worker thread when the
|
|
* socket appears to be writeable and we have something ready to send.
|
|
*/
|
|
static int try_write(struct ceph_connection *con)
|
|
{
|
|
int ret = 1;
|
|
|
|
dout("try_write start %p state %lu\n", con, con->state);
|
|
|
|
more:
|
|
dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
|
|
|
|
/* open the socket first? */
|
|
if (con->state == CON_STATE_PREOPEN) {
|
|
BUG_ON(con->sock);
|
|
con->state = CON_STATE_CONNECTING;
|
|
|
|
con_out_kvec_reset(con);
|
|
prepare_write_banner(con);
|
|
prepare_read_banner(con);
|
|
|
|
BUG_ON(con->in_msg);
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
dout("try_write initiating connect on %p new state %lu\n",
|
|
con, con->state);
|
|
ret = ceph_tcp_connect(con);
|
|
if (ret < 0) {
|
|
con->error_msg = "connect error";
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
more_kvec:
|
|
/* kvec data queued? */
|
|
if (con->out_skip) {
|
|
ret = write_partial_skip(con);
|
|
if (ret <= 0)
|
|
goto out;
|
|
}
|
|
if (con->out_kvec_left) {
|
|
ret = write_partial_kvec(con);
|
|
if (ret <= 0)
|
|
goto out;
|
|
}
|
|
|
|
/* msg pages? */
|
|
if (con->out_msg) {
|
|
if (con->out_msg_done) {
|
|
ceph_msg_put(con->out_msg);
|
|
con->out_msg = NULL; /* we're done with this one */
|
|
goto do_next;
|
|
}
|
|
|
|
ret = write_partial_msg_pages(con);
|
|
if (ret == 1)
|
|
goto more_kvec; /* we need to send the footer, too! */
|
|
if (ret == 0)
|
|
goto out;
|
|
if (ret < 0) {
|
|
dout("try_write write_partial_msg_pages err %d\n",
|
|
ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
do_next:
|
|
if (con->state == CON_STATE_OPEN) {
|
|
/* is anything else pending? */
|
|
if (!list_empty(&con->out_queue)) {
|
|
prepare_write_message(con);
|
|
goto more;
|
|
}
|
|
if (con->in_seq > con->in_seq_acked) {
|
|
prepare_write_ack(con);
|
|
goto more;
|
|
}
|
|
if (test_and_clear_bit(CON_FLAG_KEEPALIVE_PENDING,
|
|
&con->flags)) {
|
|
prepare_write_keepalive(con);
|
|
goto more;
|
|
}
|
|
}
|
|
|
|
/* Nothing to do! */
|
|
clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
dout("try_write nothing else to write.\n");
|
|
ret = 0;
|
|
out:
|
|
dout("try_write done on %p ret %d\n", con, ret);
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Read what we can from the socket.
|
|
*/
|
|
static int try_read(struct ceph_connection *con)
|
|
{
|
|
int ret = -1;
|
|
|
|
more:
|
|
dout("try_read start on %p state %lu\n", con, con->state);
|
|
if (con->state != CON_STATE_CONNECTING &&
|
|
con->state != CON_STATE_NEGOTIATING &&
|
|
con->state != CON_STATE_OPEN)
|
|
return 0;
|
|
|
|
BUG_ON(!con->sock);
|
|
|
|
dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
|
|
con->in_base_pos);
|
|
|
|
if (con->state == CON_STATE_CONNECTING) {
|
|
dout("try_read connecting\n");
|
|
ret = read_partial_banner(con);
|
|
if (ret <= 0)
|
|
goto out;
|
|
ret = process_banner(con);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
con->state = CON_STATE_NEGOTIATING;
|
|
|
|
/*
|
|
* Received banner is good, exchange connection info.
|
|
* Do not reset out_kvec, as sending our banner raced
|
|
* with receiving peer banner after connect completed.
|
|
*/
|
|
ret = prepare_write_connect(con);
|
|
if (ret < 0)
|
|
goto out;
|
|
prepare_read_connect(con);
|
|
|
|
/* Send connection info before awaiting response */
|
|
goto out;
|
|
}
|
|
|
|
if (con->state == CON_STATE_NEGOTIATING) {
|
|
dout("try_read negotiating\n");
|
|
ret = read_partial_connect(con);
|
|
if (ret <= 0)
|
|
goto out;
|
|
ret = process_connect(con);
|
|
if (ret < 0)
|
|
goto out;
|
|
goto more;
|
|
}
|
|
|
|
WARN_ON(con->state != CON_STATE_OPEN);
|
|
|
|
if (con->in_base_pos < 0) {
|
|
/*
|
|
* skipping + discarding content.
|
|
*
|
|
* FIXME: there must be a better way to do this!
|
|
*/
|
|
static char buf[SKIP_BUF_SIZE];
|
|
int skip = min((int) sizeof (buf), -con->in_base_pos);
|
|
|
|
dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
|
|
ret = ceph_tcp_recvmsg(con->sock, buf, skip);
|
|
if (ret <= 0)
|
|
goto out;
|
|
con->in_base_pos += ret;
|
|
if (con->in_base_pos)
|
|
goto more;
|
|
}
|
|
if (con->in_tag == CEPH_MSGR_TAG_READY) {
|
|
/*
|
|
* what's next?
|
|
*/
|
|
ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
|
|
if (ret <= 0)
|
|
goto out;
|
|
dout("try_read got tag %d\n", (int)con->in_tag);
|
|
switch (con->in_tag) {
|
|
case CEPH_MSGR_TAG_MSG:
|
|
prepare_read_message(con);
|
|
break;
|
|
case CEPH_MSGR_TAG_ACK:
|
|
prepare_read_ack(con);
|
|
break;
|
|
case CEPH_MSGR_TAG_CLOSE:
|
|
con_close_socket(con);
|
|
con->state = CON_STATE_CLOSED;
|
|
goto out;
|
|
default:
|
|
goto bad_tag;
|
|
}
|
|
}
|
|
if (con->in_tag == CEPH_MSGR_TAG_MSG) {
|
|
ret = read_partial_message(con);
|
|
if (ret <= 0) {
|
|
switch (ret) {
|
|
case -EBADMSG:
|
|
con->error_msg = "bad crc";
|
|
ret = -EIO;
|
|
break;
|
|
case -EIO:
|
|
con->error_msg = "io error";
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
if (con->in_tag == CEPH_MSGR_TAG_READY)
|
|
goto more;
|
|
process_message(con);
|
|
if (con->state == CON_STATE_OPEN)
|
|
prepare_read_tag(con);
|
|
goto more;
|
|
}
|
|
if (con->in_tag == CEPH_MSGR_TAG_ACK) {
|
|
ret = read_partial_ack(con);
|
|
if (ret <= 0)
|
|
goto out;
|
|
process_ack(con);
|
|
goto more;
|
|
}
|
|
|
|
out:
|
|
dout("try_read done on %p ret %d\n", con, ret);
|
|
return ret;
|
|
|
|
bad_tag:
|
|
pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
|
|
con->error_msg = "protocol error, garbage tag";
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
|
|
/*
|
|
* Atomically queue work on a connection after the specified delay.
|
|
* Bump @con reference to avoid races with connection teardown.
|
|
* Returns 0 if work was queued, or an error code otherwise.
|
|
*/
|
|
static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
|
|
{
|
|
if (!con->ops->get(con)) {
|
|
dout("%s %p ref count 0\n", __func__, con);
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
|
|
dout("%s %p - already queued\n", __func__, con);
|
|
con->ops->put(con);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
dout("%s %p %lu\n", __func__, con, delay);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void queue_con(struct ceph_connection *con)
|
|
{
|
|
(void) queue_con_delay(con, 0);
|
|
}
|
|
|
|
static bool con_sock_closed(struct ceph_connection *con)
|
|
{
|
|
if (!test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags))
|
|
return false;
|
|
|
|
#define CASE(x) \
|
|
case CON_STATE_ ## x: \
|
|
con->error_msg = "socket closed (con state " #x ")"; \
|
|
break;
|
|
|
|
switch (con->state) {
|
|
CASE(CLOSED);
|
|
CASE(PREOPEN);
|
|
CASE(CONNECTING);
|
|
CASE(NEGOTIATING);
|
|
CASE(OPEN);
|
|
CASE(STANDBY);
|
|
default:
|
|
pr_warning("%s con %p unrecognized state %lu\n",
|
|
__func__, con, con->state);
|
|
con->error_msg = "unrecognized con state";
|
|
BUG();
|
|
break;
|
|
}
|
|
#undef CASE
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Do some work on a connection. Drop a connection ref when we're done.
|
|
*/
|
|
static void con_work(struct work_struct *work)
|
|
{
|
|
struct ceph_connection *con = container_of(work, struct ceph_connection,
|
|
work.work);
|
|
int ret;
|
|
|
|
mutex_lock(&con->mutex);
|
|
restart:
|
|
if (con_sock_closed(con))
|
|
goto fault;
|
|
|
|
if (test_and_clear_bit(CON_FLAG_BACKOFF, &con->flags)) {
|
|
dout("con_work %p backing off\n", con);
|
|
ret = queue_con_delay(con, round_jiffies_relative(con->delay));
|
|
if (ret) {
|
|
dout("con_work %p FAILED to back off %lu\n", con,
|
|
con->delay);
|
|
BUG_ON(ret == -ENOENT);
|
|
set_bit(CON_FLAG_BACKOFF, &con->flags);
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
if (con->state == CON_STATE_STANDBY) {
|
|
dout("con_work %p STANDBY\n", con);
|
|
goto done;
|
|
}
|
|
if (con->state == CON_STATE_CLOSED) {
|
|
dout("con_work %p CLOSED\n", con);
|
|
BUG_ON(con->sock);
|
|
goto done;
|
|
}
|
|
if (con->state == CON_STATE_PREOPEN) {
|
|
dout("con_work OPENING\n");
|
|
BUG_ON(con->sock);
|
|
}
|
|
|
|
ret = try_read(con);
|
|
if (ret == -EAGAIN)
|
|
goto restart;
|
|
if (ret < 0) {
|
|
con->error_msg = "socket error on read";
|
|
goto fault;
|
|
}
|
|
|
|
ret = try_write(con);
|
|
if (ret == -EAGAIN)
|
|
goto restart;
|
|
if (ret < 0) {
|
|
con->error_msg = "socket error on write";
|
|
goto fault;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&con->mutex);
|
|
done_unlocked:
|
|
con->ops->put(con);
|
|
return;
|
|
|
|
fault:
|
|
ceph_fault(con); /* error/fault path */
|
|
goto done_unlocked;
|
|
}
|
|
|
|
|
|
/*
|
|
* Generic error/fault handler. A retry mechanism is used with
|
|
* exponential backoff
|
|
*/
|
|
static void ceph_fault(struct ceph_connection *con)
|
|
__releases(con->mutex)
|
|
{
|
|
pr_warning("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
|
|
ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
|
|
dout("fault %p state %lu to peer %s\n",
|
|
con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
|
|
|
|
WARN_ON(con->state != CON_STATE_CONNECTING &&
|
|
con->state != CON_STATE_NEGOTIATING &&
|
|
con->state != CON_STATE_OPEN);
|
|
|
|
con_close_socket(con);
|
|
|
|
if (test_bit(CON_FLAG_LOSSYTX, &con->flags)) {
|
|
dout("fault on LOSSYTX channel, marking CLOSED\n");
|
|
con->state = CON_STATE_CLOSED;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (con->in_msg) {
|
|
BUG_ON(con->in_msg->con != con);
|
|
con->in_msg->con = NULL;
|
|
ceph_msg_put(con->in_msg);
|
|
con->in_msg = NULL;
|
|
con->ops->put(con);
|
|
}
|
|
|
|
/* Requeue anything that hasn't been acked */
|
|
list_splice_init(&con->out_sent, &con->out_queue);
|
|
|
|
/* If there are no messages queued or keepalive pending, place
|
|
* the connection in a STANDBY state */
|
|
if (list_empty(&con->out_queue) &&
|
|
!test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags)) {
|
|
dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
|
|
clear_bit(CON_FLAG_WRITE_PENDING, &con->flags);
|
|
con->state = CON_STATE_STANDBY;
|
|
} else {
|
|
/* retry after a delay. */
|
|
con->state = CON_STATE_PREOPEN;
|
|
if (con->delay == 0)
|
|
con->delay = BASE_DELAY_INTERVAL;
|
|
else if (con->delay < MAX_DELAY_INTERVAL)
|
|
con->delay *= 2;
|
|
set_bit(CON_FLAG_BACKOFF, &con->flags);
|
|
queue_con(con);
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&con->mutex);
|
|
/*
|
|
* in case we faulted due to authentication, invalidate our
|
|
* current tickets so that we can get new ones.
|
|
*/
|
|
if (con->auth_retry && con->ops->invalidate_authorizer) {
|
|
dout("calling invalidate_authorizer()\n");
|
|
con->ops->invalidate_authorizer(con);
|
|
}
|
|
|
|
if (con->ops->fault)
|
|
con->ops->fault(con);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* initialize a new messenger instance
|
|
*/
|
|
void ceph_messenger_init(struct ceph_messenger *msgr,
|
|
struct ceph_entity_addr *myaddr,
|
|
u32 supported_features,
|
|
u32 required_features,
|
|
bool nocrc)
|
|
{
|
|
msgr->supported_features = supported_features;
|
|
msgr->required_features = required_features;
|
|
|
|
spin_lock_init(&msgr->global_seq_lock);
|
|
|
|
if (myaddr)
|
|
msgr->inst.addr = *myaddr;
|
|
|
|
/* select a random nonce */
|
|
msgr->inst.addr.type = 0;
|
|
get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
|
|
encode_my_addr(msgr);
|
|
msgr->nocrc = nocrc;
|
|
|
|
atomic_set(&msgr->stopping, 0);
|
|
|
|
dout("%s %p\n", __func__, msgr);
|
|
}
|
|
EXPORT_SYMBOL(ceph_messenger_init);
|
|
|
|
static void clear_standby(struct ceph_connection *con)
|
|
{
|
|
/* come back from STANDBY? */
|
|
if (con->state == CON_STATE_STANDBY) {
|
|
dout("clear_standby %p and ++connect_seq\n", con);
|
|
con->state = CON_STATE_PREOPEN;
|
|
con->connect_seq++;
|
|
WARN_ON(test_bit(CON_FLAG_WRITE_PENDING, &con->flags));
|
|
WARN_ON(test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Queue up an outgoing message on the given connection.
|
|
*/
|
|
void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
|
|
{
|
|
/* set src+dst */
|
|
msg->hdr.src = con->msgr->inst.name;
|
|
BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
|
|
msg->needs_out_seq = true;
|
|
|
|
mutex_lock(&con->mutex);
|
|
|
|
if (con->state == CON_STATE_CLOSED) {
|
|
dout("con_send %p closed, dropping %p\n", con, msg);
|
|
ceph_msg_put(msg);
|
|
mutex_unlock(&con->mutex);
|
|
return;
|
|
}
|
|
|
|
BUG_ON(msg->con != NULL);
|
|
msg->con = con->ops->get(con);
|
|
BUG_ON(msg->con == NULL);
|
|
|
|
BUG_ON(!list_empty(&msg->list_head));
|
|
list_add_tail(&msg->list_head, &con->out_queue);
|
|
dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
|
|
ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
|
|
ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
|
|
le32_to_cpu(msg->hdr.front_len),
|
|
le32_to_cpu(msg->hdr.middle_len),
|
|
le32_to_cpu(msg->hdr.data_len));
|
|
|
|
clear_standby(con);
|
|
mutex_unlock(&con->mutex);
|
|
|
|
/* if there wasn't anything waiting to send before, queue
|
|
* new work */
|
|
if (test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
|
|
queue_con(con);
|
|
}
|
|
EXPORT_SYMBOL(ceph_con_send);
|
|
|
|
/*
|
|
* Revoke a message that was previously queued for send
|
|
*/
|
|
void ceph_msg_revoke(struct ceph_msg *msg)
|
|
{
|
|
struct ceph_connection *con = msg->con;
|
|
|
|
if (!con)
|
|
return; /* Message not in our possession */
|
|
|
|
mutex_lock(&con->mutex);
|
|
if (!list_empty(&msg->list_head)) {
|
|
dout("%s %p msg %p - was on queue\n", __func__, con, msg);
|
|
list_del_init(&msg->list_head);
|
|
BUG_ON(msg->con == NULL);
|
|
msg->con->ops->put(msg->con);
|
|
msg->con = NULL;
|
|
msg->hdr.seq = 0;
|
|
|
|
ceph_msg_put(msg);
|
|
}
|
|
if (con->out_msg == msg) {
|
|
dout("%s %p msg %p - was sending\n", __func__, con, msg);
|
|
con->out_msg = NULL;
|
|
if (con->out_kvec_is_msg) {
|
|
con->out_skip = con->out_kvec_bytes;
|
|
con->out_kvec_is_msg = false;
|
|
}
|
|
msg->hdr.seq = 0;
|
|
|
|
ceph_msg_put(msg);
|
|
}
|
|
mutex_unlock(&con->mutex);
|
|
}
|
|
|
|
/*
|
|
* Revoke a message that we may be reading data into
|
|
*/
|
|
void ceph_msg_revoke_incoming(struct ceph_msg *msg)
|
|
{
|
|
struct ceph_connection *con;
|
|
|
|
BUG_ON(msg == NULL);
|
|
if (!msg->con) {
|
|
dout("%s msg %p null con\n", __func__, msg);
|
|
|
|
return; /* Message not in our possession */
|
|
}
|
|
|
|
con = msg->con;
|
|
mutex_lock(&con->mutex);
|
|
if (con->in_msg == msg) {
|
|
unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
|
|
unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
|
|
unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
|
|
|
|
/* skip rest of message */
|
|
dout("%s %p msg %p revoked\n", __func__, con, msg);
|
|
con->in_base_pos = con->in_base_pos -
|
|
sizeof(struct ceph_msg_header) -
|
|
front_len -
|
|
middle_len -
|
|
data_len -
|
|
sizeof(struct ceph_msg_footer);
|
|
ceph_msg_put(con->in_msg);
|
|
con->in_msg = NULL;
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
con->in_seq++;
|
|
} else {
|
|
dout("%s %p in_msg %p msg %p no-op\n",
|
|
__func__, con, con->in_msg, msg);
|
|
}
|
|
mutex_unlock(&con->mutex);
|
|
}
|
|
|
|
/*
|
|
* Queue a keepalive byte to ensure the tcp connection is alive.
|
|
*/
|
|
void ceph_con_keepalive(struct ceph_connection *con)
|
|
{
|
|
dout("con_keepalive %p\n", con);
|
|
mutex_lock(&con->mutex);
|
|
clear_standby(con);
|
|
mutex_unlock(&con->mutex);
|
|
if (test_and_set_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags) == 0 &&
|
|
test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0)
|
|
queue_con(con);
|
|
}
|
|
EXPORT_SYMBOL(ceph_con_keepalive);
|
|
|
|
|
|
/*
|
|
* construct a new message with given type, size
|
|
* the new msg has a ref count of 1.
|
|
*/
|
|
struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
|
|
bool can_fail)
|
|
{
|
|
struct ceph_msg *m;
|
|
|
|
m = kmalloc(sizeof(*m), flags);
|
|
if (m == NULL)
|
|
goto out;
|
|
kref_init(&m->kref);
|
|
|
|
m->con = NULL;
|
|
INIT_LIST_HEAD(&m->list_head);
|
|
|
|
m->hdr.tid = 0;
|
|
m->hdr.type = cpu_to_le16(type);
|
|
m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
|
|
m->hdr.version = 0;
|
|
m->hdr.front_len = cpu_to_le32(front_len);
|
|
m->hdr.middle_len = 0;
|
|
m->hdr.data_len = 0;
|
|
m->hdr.data_off = 0;
|
|
m->hdr.reserved = 0;
|
|
m->footer.front_crc = 0;
|
|
m->footer.middle_crc = 0;
|
|
m->footer.data_crc = 0;
|
|
m->footer.flags = 0;
|
|
m->front_max = front_len;
|
|
m->front_is_vmalloc = false;
|
|
m->more_to_follow = false;
|
|
m->ack_stamp = 0;
|
|
m->pool = NULL;
|
|
|
|
/* middle */
|
|
m->middle = NULL;
|
|
|
|
/* data */
|
|
m->nr_pages = 0;
|
|
m->page_alignment = 0;
|
|
m->pages = NULL;
|
|
m->pagelist = NULL;
|
|
m->bio = NULL;
|
|
m->bio_iter = NULL;
|
|
m->bio_seg = 0;
|
|
m->trail = NULL;
|
|
|
|
/* front */
|
|
if (front_len) {
|
|
if (front_len > PAGE_CACHE_SIZE) {
|
|
m->front.iov_base = __vmalloc(front_len, flags,
|
|
PAGE_KERNEL);
|
|
m->front_is_vmalloc = true;
|
|
} else {
|
|
m->front.iov_base = kmalloc(front_len, flags);
|
|
}
|
|
if (m->front.iov_base == NULL) {
|
|
dout("ceph_msg_new can't allocate %d bytes\n",
|
|
front_len);
|
|
goto out2;
|
|
}
|
|
} else {
|
|
m->front.iov_base = NULL;
|
|
}
|
|
m->front.iov_len = front_len;
|
|
|
|
dout("ceph_msg_new %p front %d\n", m, front_len);
|
|
return m;
|
|
|
|
out2:
|
|
ceph_msg_put(m);
|
|
out:
|
|
if (!can_fail) {
|
|
pr_err("msg_new can't create type %d front %d\n", type,
|
|
front_len);
|
|
WARN_ON(1);
|
|
} else {
|
|
dout("msg_new can't create type %d front %d\n", type,
|
|
front_len);
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(ceph_msg_new);
|
|
|
|
/*
|
|
* Allocate "middle" portion of a message, if it is needed and wasn't
|
|
* allocated by alloc_msg. This allows us to read a small fixed-size
|
|
* per-type header in the front and then gracefully fail (i.e.,
|
|
* propagate the error to the caller based on info in the front) when
|
|
* the middle is too large.
|
|
*/
|
|
static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
|
|
{
|
|
int type = le16_to_cpu(msg->hdr.type);
|
|
int middle_len = le32_to_cpu(msg->hdr.middle_len);
|
|
|
|
dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
|
|
ceph_msg_type_name(type), middle_len);
|
|
BUG_ON(!middle_len);
|
|
BUG_ON(msg->middle);
|
|
|
|
msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
|
|
if (!msg->middle)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate a message for receiving an incoming message on a
|
|
* connection, and save the result in con->in_msg. Uses the
|
|
* connection's private alloc_msg op if available.
|
|
*
|
|
* Returns 0 on success, or a negative error code.
|
|
*
|
|
* On success, if we set *skip = 1:
|
|
* - the next message should be skipped and ignored.
|
|
* - con->in_msg == NULL
|
|
* or if we set *skip = 0:
|
|
* - con->in_msg is non-null.
|
|
* On error (ENOMEM, EAGAIN, ...),
|
|
* - con->in_msg == NULL
|
|
*/
|
|
static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
|
|
{
|
|
struct ceph_msg_header *hdr = &con->in_hdr;
|
|
int type = le16_to_cpu(hdr->type);
|
|
int front_len = le32_to_cpu(hdr->front_len);
|
|
int middle_len = le32_to_cpu(hdr->middle_len);
|
|
int ret = 0;
|
|
|
|
BUG_ON(con->in_msg != NULL);
|
|
|
|
if (con->ops->alloc_msg) {
|
|
struct ceph_msg *msg;
|
|
|
|
mutex_unlock(&con->mutex);
|
|
msg = con->ops->alloc_msg(con, hdr, skip);
|
|
mutex_lock(&con->mutex);
|
|
if (con->state != CON_STATE_OPEN) {
|
|
if (msg)
|
|
ceph_msg_put(msg);
|
|
return -EAGAIN;
|
|
}
|
|
con->in_msg = msg;
|
|
if (con->in_msg) {
|
|
con->in_msg->con = con->ops->get(con);
|
|
BUG_ON(con->in_msg->con == NULL);
|
|
}
|
|
if (*skip) {
|
|
con->in_msg = NULL;
|
|
return 0;
|
|
}
|
|
if (!con->in_msg) {
|
|
con->error_msg =
|
|
"error allocating memory for incoming message";
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
if (!con->in_msg) {
|
|
con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
|
|
if (!con->in_msg) {
|
|
pr_err("unable to allocate msg type %d len %d\n",
|
|
type, front_len);
|
|
return -ENOMEM;
|
|
}
|
|
con->in_msg->con = con->ops->get(con);
|
|
BUG_ON(con->in_msg->con == NULL);
|
|
con->in_msg->page_alignment = le16_to_cpu(hdr->data_off);
|
|
}
|
|
memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
|
|
|
|
if (middle_len && !con->in_msg->middle) {
|
|
ret = ceph_alloc_middle(con, con->in_msg);
|
|
if (ret < 0) {
|
|
ceph_msg_put(con->in_msg);
|
|
con->in_msg = NULL;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Free a generically kmalloc'd message.
|
|
*/
|
|
void ceph_msg_kfree(struct ceph_msg *m)
|
|
{
|
|
dout("msg_kfree %p\n", m);
|
|
if (m->front_is_vmalloc)
|
|
vfree(m->front.iov_base);
|
|
else
|
|
kfree(m->front.iov_base);
|
|
kfree(m);
|
|
}
|
|
|
|
/*
|
|
* Drop a msg ref. Destroy as needed.
|
|
*/
|
|
void ceph_msg_last_put(struct kref *kref)
|
|
{
|
|
struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
|
|
|
|
dout("ceph_msg_put last one on %p\n", m);
|
|
WARN_ON(!list_empty(&m->list_head));
|
|
|
|
/* drop middle, data, if any */
|
|
if (m->middle) {
|
|
ceph_buffer_put(m->middle);
|
|
m->middle = NULL;
|
|
}
|
|
m->nr_pages = 0;
|
|
m->pages = NULL;
|
|
|
|
if (m->pagelist) {
|
|
ceph_pagelist_release(m->pagelist);
|
|
kfree(m->pagelist);
|
|
m->pagelist = NULL;
|
|
}
|
|
|
|
m->trail = NULL;
|
|
|
|
if (m->pool)
|
|
ceph_msgpool_put(m->pool, m);
|
|
else
|
|
ceph_msg_kfree(m);
|
|
}
|
|
EXPORT_SYMBOL(ceph_msg_last_put);
|
|
|
|
void ceph_msg_dump(struct ceph_msg *msg)
|
|
{
|
|
pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
|
|
msg->front_max, msg->nr_pages);
|
|
print_hex_dump(KERN_DEBUG, "header: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
&msg->hdr, sizeof(msg->hdr), true);
|
|
print_hex_dump(KERN_DEBUG, " front: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
msg->front.iov_base, msg->front.iov_len, true);
|
|
if (msg->middle)
|
|
print_hex_dump(KERN_DEBUG, "middle: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
msg->middle->vec.iov_base,
|
|
msg->middle->vec.iov_len, true);
|
|
print_hex_dump(KERN_DEBUG, "footer: ",
|
|
DUMP_PREFIX_OFFSET, 16, 1,
|
|
&msg->footer, sizeof(msg->footer), true);
|
|
}
|
|
EXPORT_SYMBOL(ceph_msg_dump);
|