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dlm for 4.3

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This set mainly includes a change to the way the
 dlm uses the SCTP API in the kernel, removing the
 direct dependency on the sctp module.  Other odd
 SCTP-related fixes are also included.  The other
 notable fix is for a long standing regression in
 the behavior of lock value blocks for user space
 locks.
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Merge tag 'dlm-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm

Pull dlm updates from David Teigland:
 "This set mainly includes a change to the way the dlm uses the SCTP API
  in the kernel, removing the direct dependency on the sctp module.
  Other odd SCTP-related fixes are also included.

  The other notable fix is for a long standing regression in the
  behavior of lock value blocks for user space locks"

* tag 'dlm-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
  dlm: print error from kernel_sendpage
  dlm: fix lvb copy for user locks
  dlm: sctp_accept_from_sock() can be static
  dlm: fix reconnecting but not sending data
  dlm: replace BUG_ON with a less severe handling
  dlm: use sctp 1-to-1 API
  dlm: fix not reconnecting on connecting error handling
  dlm: fix race while closing connections
  dlm: fix connection stealing if using SCTP
This commit is contained in:
Linus Torvalds 2015-09-03 12:57:48 -07:00
commit 9cbf22b37a
3 changed files with 309 additions and 451 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

751
fs/dlm/lowcomms.c
View file

@ -120,12 +120,11 @@ struct connection {
struct cbuf cb;
int retries;
#define MAX_CONNECT_RETRIES 3
int sctp_assoc;
struct hlist_node list;
struct connection *othercon;
struct work_struct rwork; /* Receive workqueue */
struct work_struct swork; /* Send workqueue */
bool try_new_addr;
void (*orig_error_report)(struct sock *sk);
};
#define sock2con(x) ((struct connection *)(x)->sk_user_data)
@ -252,26 +251,6 @@ static struct connection *nodeid2con(int nodeid, gfp_t allocation)
return con;
}
/* This is a bit drastic, but only called when things go wrong */
static struct connection *assoc2con(int assoc_id)
{
int i;
struct connection *con;
mutex_lock(&connections_lock);
for (i = 0 ; i < CONN_HASH_SIZE; i++) {
hlist_for_each_entry(con, &connection_hash[i], list) {
if (con->sctp_assoc == assoc_id) {
mutex_unlock(&connections_lock);
return con;
}
}
}
mutex_unlock(&connections_lock);
return NULL;
}
static struct dlm_node_addr *find_node_addr(int nodeid)
{
struct dlm_node_addr *na;
@ -322,14 +301,14 @@ static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out,
spin_lock(&dlm_node_addrs_spin);
na = find_node_addr(nodeid);
if (na && na->addr_count) {
memcpy(&sas, na->addr[na->curr_addr_index],
sizeof(struct sockaddr_storage));
if (try_new_addr) {
na->curr_addr_index++;
if (na->curr_addr_index == na->addr_count)
na->curr_addr_index = 0;
}
memcpy(&sas, na->addr[na->curr_addr_index ],
sizeof(struct sockaddr_storage));
}
spin_unlock(&dlm_node_addrs_spin);
@ -459,18 +438,23 @@ static inline void lowcomms_connect_sock(struct connection *con)
static void lowcomms_state_change(struct sock *sk)
{
if (sk->sk_state == TCP_ESTABLISHED)
/* SCTP layer is not calling sk_data_ready when the connection
* is done, so we catch the signal through here. Also, it
* doesn't switch socket state when entering shutdown, so we
* skip the write in that case.
*/
if (sk->sk_shutdown) {
if (sk->sk_shutdown == RCV_SHUTDOWN)
lowcomms_data_ready(sk);
} else if (sk->sk_state == TCP_ESTABLISHED) {
lowcomms_write_space(sk);
}
}
int dlm_lowcomms_connect_node(int nodeid)
{
struct connection *con;
/* with sctp there's no connecting without sending */
if (dlm_config.ci_protocol != 0)
return 0;
if (nodeid == dlm_our_nodeid())
return 0;
@ -481,6 +465,43 @@ int dlm_lowcomms_connect_node(int nodeid)
return 0;
}
static void lowcomms_error_report(struct sock *sk)
{
struct connection *con = sock2con(sk);
struct sockaddr_storage saddr;
if (nodeid_to_addr(con->nodeid, &saddr, NULL, false)) {
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
"sending to node %d, port %d, "
"sk_err=%d/%d\n", dlm_our_nodeid(),
con->nodeid, dlm_config.ci_tcp_port,
sk->sk_err, sk->sk_err_soft);
return;
} else if (saddr.ss_family == AF_INET) {
struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr;
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
"sending to node %d at %pI4, port %d, "
"sk_err=%d/%d\n", dlm_our_nodeid(),
con->nodeid, &sin4->sin_addr.s_addr,
dlm_config.ci_tcp_port, sk->sk_err,
sk->sk_err_soft);
} else {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr;
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
"sending to node %d at %u.%u.%u.%u, "
"port %d, sk_err=%d/%d\n", dlm_our_nodeid(),
con->nodeid, sin6->sin6_addr.s6_addr32[0],
sin6->sin6_addr.s6_addr32[1],
sin6->sin6_addr.s6_addr32[2],
sin6->sin6_addr.s6_addr32[3],
dlm_config.ci_tcp_port, sk->sk_err,
sk->sk_err_soft);
}
con->orig_error_report(sk);
}
/* Make a socket active */
static void add_sock(struct socket *sock, struct connection *con)
{
@ -492,6 +513,8 @@ static void add_sock(struct socket *sock, struct connection *con)
con->sock->sk->sk_state_change = lowcomms_state_change;
con->sock->sk->sk_user_data = con;
con->sock->sk->sk_allocation = GFP_NOFS;
con->orig_error_report = con->sock->sk->sk_error_report;
con->sock->sk->sk_error_report = lowcomms_error_report;
}
/* Add the port number to an IPv6 or 4 sockaddr and return the address
@ -514,17 +537,24 @@ static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
}
/* Close a remote connection and tidy up */
static void close_connection(struct connection *con, bool and_other)
static void close_connection(struct connection *con, bool and_other,
bool tx, bool rx)
{
mutex_lock(&con->sock_mutex);
clear_bit(CF_CONNECT_PENDING, &con->flags);
clear_bit(CF_WRITE_PENDING, &con->flags);
if (tx && cancel_work_sync(&con->swork))
log_print("canceled swork for node %d", con->nodeid);
if (rx && cancel_work_sync(&con->rwork))
log_print("canceled rwork for node %d", con->nodeid);
mutex_lock(&con->sock_mutex);
if (con->sock) {
sock_release(con->sock);
con->sock = NULL;
}
if (con->othercon && and_other) {
/* Will only re-enter once. */
close_connection(con->othercon, false);
close_connection(con->othercon, false, true, true);
}
if (con->rx_page) {
__free_page(con->rx_page);
@ -535,254 +565,6 @@ static void close_connection(struct connection *con, bool and_other)
mutex_unlock(&con->sock_mutex);
}
/* We only send shutdown messages to nodes that are not part of the cluster */
static void sctp_send_shutdown(sctp_assoc_t associd)
{
static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
struct msghdr outmessage;
struct cmsghdr *cmsg;
struct sctp_sndrcvinfo *sinfo;
int ret;
struct connection *con;
con = nodeid2con(0,0);
BUG_ON(con == NULL);
outmessage.msg_name = NULL;
outmessage.msg_namelen = 0;
outmessage.msg_control = outcmsg;
outmessage.msg_controllen = sizeof(outcmsg);
outmessage.msg_flags = MSG_EOR;
cmsg = CMSG_FIRSTHDR(&outmessage);
cmsg->cmsg_level = IPPROTO_SCTP;
cmsg->cmsg_type = SCTP_SNDRCV;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
outmessage.msg_controllen = cmsg->cmsg_len;
sinfo = CMSG_DATA(cmsg);
memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
sinfo->sinfo_flags |= MSG_EOF;
sinfo->sinfo_assoc_id = associd;
ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0);
if (ret != 0)
log_print("send EOF to node failed: %d", ret);
}
static void sctp_init_failed_foreach(struct connection *con)
{
/*
* Don't try to recover base con and handle race where the
* other node's assoc init creates a assoc and we get that
* notification, then we get a notification that our attempt
* failed due. This happens when we are still trying the primary
* address, but the other node has already tried secondary addrs
* and found one that worked.
*/
if (!con->nodeid || con->sctp_assoc)
return;
log_print("Retrying SCTP association init for node %d\n", con->nodeid);
con->try_new_addr = true;
con->sctp_assoc = 0;
if (test_and_clear_bit(CF_INIT_PENDING, &con->flags)) {
if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
queue_work(send_workqueue, &con->swork);
}
}
/* INIT failed but we don't know which node...
restart INIT on all pending nodes */
static void sctp_init_failed(void)
{
mutex_lock(&connections_lock);
foreach_conn(sctp_init_failed_foreach);
mutex_unlock(&connections_lock);
}
static void retry_failed_sctp_send(struct connection *recv_con,
struct sctp_send_failed *sn_send_failed,
char *buf)
{
int len = sn_send_failed->ssf_length - sizeof(struct sctp_send_failed);
struct dlm_mhandle *mh;
struct connection *con;
char *retry_buf;
int nodeid = sn_send_failed->ssf_info.sinfo_ppid;
log_print("Retry sending %d bytes to node id %d", len, nodeid);
if (!nodeid) {
log_print("Shouldn't resend data via listening connection.");
return;
}
con = nodeid2con(nodeid, 0);
if (!con) {
log_print("Could not look up con for nodeid %d\n",
nodeid);
return;
}
mh = dlm_lowcomms_get_buffer(nodeid, len, GFP_NOFS, &retry_buf);
if (!mh) {
log_print("Could not allocate buf for retry.");
return;
}
memcpy(retry_buf, buf + sizeof(struct sctp_send_failed), len);
dlm_lowcomms_commit_buffer(mh);
/*
* If we got a assoc changed event before the send failed event then
* we only need to retry the send.
*/
if (con->sctp_assoc) {
if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
queue_work(send_workqueue, &con->swork);
} else
sctp_init_failed_foreach(con);
}
/* Something happened to an association */
static void process_sctp_notification(struct connection *con,
struct msghdr *msg, char *buf)
{
union sctp_notification *sn = (union sctp_notification *)buf;
struct linger linger;
switch (sn->sn_header.sn_type) {
case SCTP_SEND_FAILED:
retry_failed_sctp_send(con, &sn->sn_send_failed, buf);
break;
case SCTP_ASSOC_CHANGE:
switch (sn->sn_assoc_change.sac_state) {
case SCTP_COMM_UP:
case SCTP_RESTART:
{
/* Check that the new node is in the lockspace */
struct sctp_prim prim;
int nodeid;
int prim_len, ret;
int addr_len;
struct connection *new_con;
/*
* We get this before any data for an association.
* We verify that the node is in the cluster and
* then peel off a socket for it.
*/
if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) {
log_print("COMM_UP for invalid assoc ID %d",
(int)sn->sn_assoc_change.sac_assoc_id);
sctp_init_failed();
return;
}
memset(&prim, 0, sizeof(struct sctp_prim));
prim_len = sizeof(struct sctp_prim);
prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id;
ret = kernel_getsockopt(con->sock,
IPPROTO_SCTP,
SCTP_PRIMARY_ADDR,
(char*)&prim,
&prim_len);
if (ret < 0) {
log_print("getsockopt/sctp_primary_addr on "
"new assoc %d failed : %d",
(int)sn->sn_assoc_change.sac_assoc_id,
ret);
/* Retry INIT later */
new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id);
if (new_con)
clear_bit(CF_CONNECT_PENDING, &con->flags);
return;
}
make_sockaddr(&prim.ssp_addr, 0, &addr_len);
if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
unsigned char *b=(unsigned char *)&prim.ssp_addr;
log_print("reject connect from unknown addr");
print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE,
b, sizeof(struct sockaddr_storage));
sctp_send_shutdown(prim.ssp_assoc_id);
return;
}
new_con = nodeid2con(nodeid, GFP_NOFS);
if (!new_con)
return;
/* Peel off a new sock */
lock_sock(con->sock->sk);
ret = sctp_do_peeloff(con->sock->sk,
sn->sn_assoc_change.sac_assoc_id,
&new_con->sock);
release_sock(con->sock->sk);
if (ret < 0) {
log_print("Can't peel off a socket for "
"connection %d to node %d: err=%d",
(int)sn->sn_assoc_change.sac_assoc_id,
nodeid, ret);
return;
}
add_sock(new_con->sock, new_con);
linger.l_onoff = 1;
linger.l_linger = 0;
ret = kernel_setsockopt(new_con->sock, SOL_SOCKET, SO_LINGER,
(char *)&linger, sizeof(linger));
if (ret < 0)
log_print("set socket option SO_LINGER failed");
log_print("connecting to %d sctp association %d",
nodeid, (int)sn->sn_assoc_change.sac_assoc_id);
new_con->sctp_assoc = sn->sn_assoc_change.sac_assoc_id;
new_con->try_new_addr = false;
/* Send any pending writes */
clear_bit(CF_CONNECT_PENDING, &new_con->flags);
clear_bit(CF_INIT_PENDING, &new_con->flags);
if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) {
queue_work(send_workqueue, &new_con->swork);
}
if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags))
queue_work(recv_workqueue, &new_con->rwork);
}
break;
case SCTP_COMM_LOST:
case SCTP_SHUTDOWN_COMP:
{
con = assoc2con(sn->sn_assoc_change.sac_assoc_id);
if (con) {
con->sctp_assoc = 0;
}
}
break;
case SCTP_CANT_STR_ASSOC:
{
/* Will retry init when we get the send failed notification */
log_print("Can't start SCTP association - retrying");
}
break;
default:
log_print("unexpected SCTP assoc change id=%d state=%d",
(int)sn->sn_assoc_change.sac_assoc_id,
sn->sn_assoc_change.sac_state);
}
default:
; /* fall through */
}
}
/* Data received from remote end */
static int receive_from_sock(struct connection *con)
{
@ -793,7 +575,6 @@ static int receive_from_sock(struct connection *con)
int r;
int call_again_soon = 0;
int nvec;
char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
mutex_lock(&con->sock_mutex);
@ -801,6 +582,10 @@ static int receive_from_sock(struct connection *con)
ret = -EAGAIN;
goto out_close;
}
if (con->nodeid == 0) {
ret = -EINVAL;
goto out_close;
}
if (con->rx_page == NULL) {
/*
@ -813,11 +598,6 @@ static int receive_from_sock(struct connection *con)
cbuf_init(&con->cb, PAGE_CACHE_SIZE);
}
/* Only SCTP needs these really */
memset(&incmsg, 0, sizeof(incmsg));
msg.msg_control = incmsg;
msg.msg_controllen = sizeof(incmsg);
/*
* iov[0] is the bit of the circular buffer between the current end
* point (cb.base + cb.len) and the end of the buffer.
@ -843,31 +623,18 @@ static int receive_from_sock(struct connection *con)
MSG_DONTWAIT | MSG_NOSIGNAL);
if (ret <= 0)
goto out_close;
/* Process SCTP notifications */
if (msg.msg_flags & MSG_NOTIFICATION) {
msg.msg_control = incmsg;
msg.msg_controllen = sizeof(incmsg);
process_sctp_notification(con, &msg,
page_address(con->rx_page) + con->cb.base);
mutex_unlock(&con->sock_mutex);
return 0;
}
BUG_ON(con->nodeid == 0);
if (ret == len)
else if (ret == len)
call_again_soon = 1;
cbuf_add(&con->cb, ret);
ret = dlm_process_incoming_buffer(con->nodeid,
page_address(con->rx_page),
con->cb.base, con->cb.len,
PAGE_CACHE_SIZE);
if (ret == -EBADMSG) {
log_print("lowcomms: addr=%p, base=%u, len=%u, "
"iov_len=%u, iov_base[0]=%p, read=%d",
page_address(con->rx_page), con->cb.base, con->cb.len,
len, iov[0].iov_base, r);
log_print("lowcomms: addr=%p, base=%u, len=%u, read=%d",
page_address(con->rx_page), con->cb.base,
con->cb.len, r);
}
if (ret < 0)
goto out_close;
@ -892,7 +659,7 @@ static int receive_from_sock(struct connection *con)
out_close:
mutex_unlock(&con->sock_mutex);
if (ret != -EAGAIN) {
close_connection(con, false);
close_connection(con, false, true, false);
/* Reconnect when there is something to send */
}
/* Don't return success if we really got EOF */
@ -1033,6 +800,120 @@ static int tcp_accept_from_sock(struct connection *con)
return result;
}
static int sctp_accept_from_sock(struct connection *con)
{
/* Check that the new node is in the lockspace */
struct sctp_prim prim;
int nodeid;
int prim_len, ret;
int addr_len;
struct connection *newcon;
struct connection *addcon;
struct socket *newsock;
mutex_lock(&connections_lock);
if (!dlm_allow_conn) {
mutex_unlock(&connections_lock);
return -1;
}
mutex_unlock(&connections_lock);
mutex_lock_nested(&con->sock_mutex, 0);
ret = kernel_accept(con->sock, &newsock, O_NONBLOCK);
if (ret < 0)
goto accept_err;
memset(&prim, 0, sizeof(struct sctp_prim));
prim_len = sizeof(struct sctp_prim);
ret = kernel_getsockopt(newsock, IPPROTO_SCTP, SCTP_PRIMARY_ADDR,
(char *)&prim, &prim_len);
if (ret < 0) {
log_print("getsockopt/sctp_primary_addr failed: %d", ret);
goto accept_err;
}
make_sockaddr(&prim.ssp_addr, 0, &addr_len);
if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
unsigned char *b = (unsigned char *)&prim.ssp_addr;
log_print("reject connect from unknown addr");
print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE,
b, sizeof(struct sockaddr_storage));
goto accept_err;
}
newcon = nodeid2con(nodeid, GFP_NOFS);
if (!newcon) {
ret = -ENOMEM;
goto accept_err;
}
mutex_lock_nested(&newcon->sock_mutex, 1);
if (newcon->sock) {
struct connection *othercon = newcon->othercon;
if (!othercon) {
othercon = kmem_cache_zalloc(con_cache, GFP_NOFS);
if (!othercon) {
log_print("failed to allocate incoming socket");
mutex_unlock(&newcon->sock_mutex);
ret = -ENOMEM;
goto accept_err;
}
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
}
if (!othercon->sock) {
newcon->othercon = othercon;
othercon->sock = newsock;
newsock->sk->sk_user_data = othercon;
add_sock(newsock, othercon);
addcon = othercon;
} else {
printk("Extra connection from node %d attempted\n", nodeid);
ret = -EAGAIN;
mutex_unlock(&newcon->sock_mutex);
goto accept_err;
}
} else {
newsock->sk->sk_user_data = newcon;
newcon->rx_action = receive_from_sock;
add_sock(newsock, newcon);
addcon = newcon;
}
log_print("connected to %d", nodeid);
mutex_unlock(&newcon->sock_mutex);
/*
* Add it to the active queue in case we got data
* between processing the accept adding the socket
* to the read_sockets list
*/
if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags))
queue_work(recv_workqueue, &addcon->rwork);
mutex_unlock(&con->sock_mutex);
return 0;
accept_err:
mutex_unlock(&con->sock_mutex);
if (newsock)
sock_release(newsock);
if (ret != -EAGAIN)
log_print("error accepting connection from node: %d", ret);
return ret;
}
static void free_entry(struct writequeue_entry *e)
{
__free_page(e->page);
@ -1057,97 +938,129 @@ static void writequeue_entry_complete(struct writequeue_entry *e, int completed)
}
}
/*
* sctp_bind_addrs - bind a SCTP socket to all our addresses
*/
static int sctp_bind_addrs(struct connection *con, uint16_t port)
{
struct sockaddr_storage localaddr;
int i, addr_len, result = 0;
for (i = 0; i < dlm_local_count; i++) {
memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr));
make_sockaddr(&localaddr, port, &addr_len);
if (!i)
result = kernel_bind(con->sock,
(struct sockaddr *)&localaddr,
addr_len);
else
result = kernel_setsockopt(con->sock, SOL_SCTP,
SCTP_SOCKOPT_BINDX_ADD,
(char *)&localaddr, addr_len);
if (result < 0) {
log_print("Can't bind to %d addr number %d, %d.\n",
port, i + 1, result);
break;
}
}
return result;
}
/* Initiate an SCTP association.
This is a special case of send_to_sock() in that we don't yet have a
peeled-off socket for this association, so we use the listening socket
and add the primary IP address of the remote node.
*/
static void sctp_init_assoc(struct connection *con)
static void sctp_connect_to_sock(struct connection *con)
{
struct sockaddr_storage rem_addr;
char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
struct msghdr outmessage;
struct cmsghdr *cmsg;
struct sctp_sndrcvinfo *sinfo;
struct connection *base_con;
struct writequeue_entry *e;
int len, offset;
int ret;
int addrlen;
struct kvec iov[1];
struct sockaddr_storage daddr;
int one = 1;
int result;
int addr_len;
struct socket *sock;
if (con->nodeid == 0) {
log_print("attempt to connect sock 0 foiled");
return;
}
mutex_lock(&con->sock_mutex);
if (test_and_set_bit(CF_INIT_PENDING, &con->flags))
goto unlock;
if (nodeid_to_addr(con->nodeid, NULL, (struct sockaddr *)&rem_addr,
con->try_new_addr)) {
/* Some odd races can cause double-connects, ignore them */
if (con->retries++ > MAX_CONNECT_RETRIES)
goto out;
if (con->sock) {
log_print("node %d already connected.", con->nodeid);
goto out;
}
memset(&daddr, 0, sizeof(daddr));
result = nodeid_to_addr(con->nodeid, &daddr, NULL, true);
if (result < 0) {
log_print("no address for nodeid %d", con->nodeid);
goto unlock;
}
base_con = nodeid2con(0, 0);
BUG_ON(base_con == NULL);
make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen);
outmessage.msg_name = &rem_addr;
outmessage.msg_namelen = addrlen;
outmessage.msg_control = outcmsg;
outmessage.msg_controllen = sizeof(outcmsg);
outmessage.msg_flags = MSG_EOR;
spin_lock(&con->writequeue_lock);
if (list_empty(&con->writequeue)) {
spin_unlock(&con->writequeue_lock);
log_print("writequeue empty for nodeid %d", con->nodeid);
goto unlock;
goto out;
}
e = list_first_entry(&con->writequeue, struct writequeue_entry, list);
len = e->len;
offset = e->offset;
/* Create a socket to communicate with */
result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
SOCK_STREAM, IPPROTO_SCTP, &sock);
if (result < 0)
goto socket_err;
/* Send the first block off the write queue */
iov[0].iov_base = page_address(e->page)+offset;
iov[0].iov_len = len;
spin_unlock(&con->writequeue_lock);
sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
con->connect_action = sctp_connect_to_sock;
add_sock(sock, con);
if (rem_addr.ss_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)&rem_addr;
log_print("Trying to connect to %pI4", &sin->sin_addr.s_addr);
} else {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&rem_addr;
log_print("Trying to connect to %pI6", &sin6->sin6_addr);
}
/* Bind to all addresses. */
if (sctp_bind_addrs(con, 0))
goto bind_err;
cmsg = CMSG_FIRSTHDR(&outmessage);
cmsg->cmsg_level = IPPROTO_SCTP;
cmsg->cmsg_type = SCTP_SNDRCV;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
sinfo = CMSG_DATA(cmsg);
memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo));
sinfo->sinfo_ppid = cpu_to_le32(con->nodeid);
outmessage.msg_controllen = cmsg->cmsg_len;
sinfo->sinfo_flags |= SCTP_ADDR_OVER;
make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len);
ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len);
if (ret < 0) {
log_print("Send first packet to node %d failed: %d",
con->nodeid, ret);
log_print("connecting to %d", con->nodeid);
/* Try again later */
clear_bit(CF_CONNECT_PENDING, &con->flags);
clear_bit(CF_INIT_PENDING, &con->flags);
}
else {
spin_lock(&con->writequeue_lock);
writequeue_entry_complete(e, ret);
spin_unlock(&con->writequeue_lock);
}
/* Turn off Nagle's algorithm */
kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one,
sizeof(one));
unlock:
result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len,
O_NONBLOCK);
if (result == -EINPROGRESS)
result = 0;
if (result == 0)
goto out;
bind_err:
con->sock = NULL;
sock_release(sock);
socket_err:
/*
* Some errors are fatal and this list might need adjusting. For other
* errors we try again until the max number of retries is reached.
*/
if (result != -EHOSTUNREACH &&
result != -ENETUNREACH &&
result != -ENETDOWN &&
result != -EINVAL &&
result != -EPROTONOSUPPORT) {
log_print("connect %d try %d error %d", con->nodeid,
con->retries, result);
mutex_unlock(&con->sock_mutex);
msleep(1000);
clear_bit(CF_CONNECT_PENDING, &con->flags);
lowcomms_connect_sock(con);
return;
}
out:
mutex_unlock(&con->sock_mutex);
set_bit(CF_WRITE_PENDING, &con->flags);
}
/* Connect a new socket to its peer */
@ -1236,11 +1149,13 @@ static void tcp_connect_to_sock(struct connection *con)
con->retries, result);
mutex_unlock(&con->sock_mutex);
msleep(1000);
clear_bit(CF_CONNECT_PENDING, &con->flags);
lowcomms_connect_sock(con);
return;
}
out:
mutex_unlock(&con->sock_mutex);
set_bit(CF_WRITE_PENDING, &con->flags);
return;
}
@ -1325,37 +1240,11 @@ static void init_local(void)
}
}
/* Bind to an IP address. SCTP allows multiple address so it can do
multi-homing */
static int add_sctp_bind_addr(struct connection *sctp_con,
struct sockaddr_storage *addr,
int addr_len, int num)
{
int result = 0;
if (num == 1)
result = kernel_bind(sctp_con->sock,
(struct sockaddr *) addr,
addr_len);
else
result = kernel_setsockopt(sctp_con->sock, SOL_SCTP,
SCTP_SOCKOPT_BINDX_ADD,
(char *)addr, addr_len);
if (result < 0)
log_print("Can't bind to port %d addr number %d",
dlm_config.ci_tcp_port, num);
return result;
}
/* Initialise SCTP socket and bind to all interfaces */
static int sctp_listen_for_all(void)
{
struct socket *sock = NULL;
struct sockaddr_storage localaddr;
struct sctp_event_subscribe subscribe;
int result = -EINVAL, num = 1, i, addr_len;
int result = -EINVAL;
struct connection *con = nodeid2con(0, GFP_NOFS);
int bufsize = NEEDED_RMEM;
int one = 1;
@ -1366,33 +1255,17 @@ static int sctp_listen_for_all(void)
log_print("Using SCTP for communications");
result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
SOCK_STREAM, IPPROTO_SCTP, &sock);
if (result < 0) {
log_print("Can't create comms socket, check SCTP is loaded");
goto out;
}
/* Listen for events */
memset(&subscribe, 0, sizeof(subscribe));
subscribe.sctp_data_io_event = 1;
subscribe.sctp_association_event = 1;
subscribe.sctp_send_failure_event = 1;
subscribe.sctp_shutdown_event = 1;
subscribe.sctp_partial_delivery_event = 1;
result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE,
(char *)&bufsize, sizeof(bufsize));
if (result)
log_print("Error increasing buffer space on socket %d", result);
result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS,
(char *)&subscribe, sizeof(subscribe));
if (result < 0) {
log_print("Failed to set SCTP_EVENTS on socket: result=%d",
result);
goto create_delsock;
}
result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one,
sizeof(one));
if (result < 0)
@ -1402,19 +1275,12 @@ static int sctp_listen_for_all(void)
sock->sk->sk_user_data = con;
con->sock = sock;
con->sock->sk->sk_data_ready = lowcomms_data_ready;
con->rx_action = receive_from_sock;
con->connect_action = sctp_init_assoc;
con->rx_action = sctp_accept_from_sock;
con->connect_action = sctp_connect_to_sock;
/* Bind to all interfaces. */
for (i = 0; i < dlm_local_count; i++) {
memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr));
make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len);
result = add_sctp_bind_addr(con, &localaddr, addr_len, num);
if (result)
/* Bind to all addresses. */
if (sctp_bind_addrs(con, dlm_config.ci_tcp_port))
goto create_delsock;
++num;
}
result = sock->ops->listen(sock, 5);
if (result < 0) {
@ -1612,13 +1478,12 @@ static void send_to_sock(struct connection *con)
send_error:
mutex_unlock(&con->sock_mutex);
close_connection(con, false);
close_connection(con, false, false, true);
lowcomms_connect_sock(con);
return;
out_connect:
mutex_unlock(&con->sock_mutex);
if (!test_bit(CF_INIT_PENDING, &con->flags))
lowcomms_connect_sock(con);
}
@ -1644,15 +1509,9 @@ int dlm_lowcomms_close(int nodeid)
log_print("closing connection to node %d", nodeid);
con = nodeid2con(nodeid, 0);
if (con) {
clear_bit(CF_CONNECT_PENDING, &con->flags);
clear_bit(CF_WRITE_PENDING, &con->flags);
set_bit(CF_CLOSE, &con->flags);
if (cancel_work_sync(&con->swork))
log_print("canceled swork for node %d", nodeid);
if (cancel_work_sync(&con->rwork))
log_print("canceled rwork for node %d", nodeid);
close_connection(con, true, true, true);
clean_one_writequeue(con);
close_connection(con, true);
}
spin_lock(&dlm_node_addrs_spin);
@ -1685,10 +1544,8 @@ static void process_send_sockets(struct work_struct *work)
{
struct connection *con = container_of(work, struct connection, swork);
if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) {
if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags))
con->connect_action(con);
set_bit(CF_WRITE_PENDING, &con->flags);
}
if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags))
send_to_sock(con);
}
@ -1735,7 +1592,7 @@ static void stop_conn(struct connection *con)
static void free_conn(struct connection *con)
{
close_connection(con, true);
close_connection(con, true, true, true);
if (con->othercon)
kmem_cache_free(con_cache, con->othercon);
hlist_del(&con->list);
@ -1806,7 +1663,7 @@ int dlm_lowcomms_start(void)
dlm_allow_conn = 0;
con = nodeid2con(0,0);
if (con) {
close_connection(con, false);
close_connection(con, false, true, true);
kmem_cache_free(con_cache, con);
}
fail_destroy:

7
fs/dlm/user.c
View file

@ -782,6 +782,7 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
DECLARE_WAITQUEUE(wait, current);
struct dlm_callback cb;
int rv, resid, copy_lvb = 0;
int old_mode, new_mode;
if (count == sizeof(struct dlm_device_version)) {
rv = copy_version_to_user(buf, count);
@ -838,6 +839,9 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list);
/* rem_lkb_callback sets a new lkb_last_cast */
old_mode = lkb->lkb_last_cast.mode;
rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid);
if (rv < 0) {
/* this shouldn't happen; lkb should have been removed from
@ -861,9 +865,6 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
}
if (cb.flags & DLM_CB_CAST) {
int old_mode, new_mode;
old_mode = lkb->lkb_last_cast.mode;
new_mode = cb.mode;
if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr &&

2
include/uapi/linux/dlm_device.h
View file

@ -26,7 +26,7 @@
/* Version of the device interface */
#define DLM_DEVICE_VERSION_MAJOR 6
#define DLM_DEVICE_VERSION_MINOR 0
#define DLM_DEVICE_VERSION_PATCH 1
#define DLM_DEVICE_VERSION_PATCH 2
/* struct passed to the lock write */
struct dlm_lock_params {