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authorLinus Torvalds <torvalds@linux-foundation.org>2017-11-14 14:06:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-14 14:06:51 -0800
commitf0b60bfa952458286f43a63c07b0eea170b2cc95 (patch)
treefc326d55acf307786fde06cc7e2daeff713ff715 /fs/dlm
parent29309a4eb8a2a9163b20657ce30510406c792d79 (diff)
parent9250e523592a8ced3ecd14abe29fbb1e036bd7eb (diff)
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Merge tag 'dlm-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
Pull dlm updates from David Teigland: "This set focuses, as usual, on fixes to the comms layer. New testing of the dlm with ocfs2 uncovered a number of bugs in the TCP connection handling during recovery, starting, and stopping" * tag 'dlm-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm: dlm: remove dlm_send_rcom_lookup_dump dlm: recheck kthread_should_stop() before schedule() DLM: fix NULL pointer dereference in send_to_sock() DLM: fix to reschedule rwork DLM: fix to use sk_callback_lock correctly DLM: fix overflow dlm_cb_seq DLM: fix memory leak in tcp_accept_from_sock() DLM: fix conversion deadlock when DLM_LKF_NODLCKWT flag is set DLM: use CF_CLOSE flag to stop dlm_send correctly DLM: Reanimate CF_WRITE_PENDING flag DLM: fix race condition between dlm_recoverd_stop and dlm_recoverd DLM: close othercon at send/receive error DLM: retry rcom when dlm_wait_function is timed out. DLM: fix to use sock_mutex correctly in xxx_accept_from_sock DLM: fix race condition between dlm_send and dlm_recv DLM: fix double list_del() DLM: fix remove save_cb argument from add_sock() DLM: Fix saving of NULL callbacks DLM: Eliminate CF_WRITE_PENDING flag DLM: Eliminate CF_CONNECT_PENDING flag
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/ast.c2
-rw-r--r--fs/dlm/lock.c43
-rw-r--r--fs/dlm/lowcomms.c218
-rw-r--r--fs/dlm/rcom.c26
-rw-r--r--fs/dlm/rcom.h1
-rw-r--r--fs/dlm/recover.c4
-rw-r--r--fs/dlm/recoverd.c16
7 files changed, 186 insertions, 124 deletions
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 07fed838d8fd..562fa8c3edff 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -181,6 +181,8 @@ void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
spin_lock(&dlm_cb_seq_spin);
new_seq = ++dlm_cb_seq;
+ if (!dlm_cb_seq)
+ new_seq = ++dlm_cb_seq;
spin_unlock(&dlm_cb_seq_spin);
if (lkb->lkb_flags & DLM_IFL_USER) {
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index d4aaddec1b16..cc91963683de 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -1003,7 +1003,6 @@ int dlm_master_lookup(struct dlm_ls *ls, int from_nodeid, char *name, int len,
if (r->res_master_nodeid == our_nodeid) {
log_error(ls, "from_master %d our_master", from_nodeid);
dlm_dump_rsb(r);
- dlm_send_rcom_lookup_dump(r, from_nodeid);
goto out_found;
}
@@ -2465,14 +2464,12 @@ static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now,
if (lkb->lkb_exflags & DLM_LKF_CONVDEADLK) {
lkb->lkb_grmode = DLM_LOCK_NL;
lkb->lkb_sbflags |= DLM_SBF_DEMOTED;
- } else if (!(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
- if (err)
- *err = -EDEADLK;
- else {
- log_print("can_be_granted deadlock %x now %d",
- lkb->lkb_id, now);
- dlm_dump_rsb(r);
- }
+ } else if (err) {
+ *err = -EDEADLK;
+ } else {
+ log_print("can_be_granted deadlock %x now %d",
+ lkb->lkb_id, now);
+ dlm_dump_rsb(r);
}
goto out;
}
@@ -2501,13 +2498,6 @@ static int can_be_granted(struct dlm_rsb *r, struct dlm_lkb *lkb, int now,
return rv;
}
-/* FIXME: I don't think that can_be_granted() can/will demote or find deadlock
- for locks pending on the convert list. Once verified (watch for these
- log_prints), we should be able to just call _can_be_granted() and not
- bother with the demote/deadlk cases here (and there's no easy way to deal
- with a deadlk here, we'd have to generate something like grant_lock with
- the deadlk error.) */
-
/* Returns the highest requested mode of all blocked conversions; sets
cw if there's a blocked conversion to DLM_LOCK_CW. */
@@ -2545,9 +2535,22 @@ static int grant_pending_convert(struct dlm_rsb *r, int high, int *cw,
}
if (deadlk) {
- log_print("WARN: pending deadlock %x node %d %s",
- lkb->lkb_id, lkb->lkb_nodeid, r->res_name);
- dlm_dump_rsb(r);
+ /*
+ * If DLM_LKB_NODLKWT flag is set and conversion
+ * deadlock is detected, we request blocking AST and
+ * down (or cancel) conversion.
+ */
+ if (lkb->lkb_exflags & DLM_LKF_NODLCKWT) {
+ if (lkb->lkb_highbast < lkb->lkb_rqmode) {
+ queue_bast(r, lkb, lkb->lkb_rqmode);
+ lkb->lkb_highbast = lkb->lkb_rqmode;
+ }
+ } else {
+ log_print("WARN: pending deadlock %x node %d %s",
+ lkb->lkb_id, lkb->lkb_nodeid,
+ r->res_name);
+ dlm_dump_rsb(r);
+ }
continue;
}
@@ -3123,7 +3126,7 @@ static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
deadlock, so we leave it on the granted queue and return EDEADLK in
the ast for the convert. */
- if (deadlk) {
+ if (deadlk && !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
/* it's left on the granted queue */
revert_lock(r, lkb);
queue_cast(r, lkb, -EDEADLK);
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 4813d0e0cd9b..05707850f93a 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -107,11 +107,11 @@ struct connection {
unsigned long flags;
#define CF_READ_PENDING 1
#define CF_WRITE_PENDING 2
-#define CF_CONNECT_PENDING 3
#define CF_INIT_PENDING 4
#define CF_IS_OTHERCON 5
#define CF_CLOSE 6
#define CF_APP_LIMITED 7
+#define CF_CLOSING 8
struct list_head writequeue; /* List of outgoing writequeue_entries */
spinlock_t writequeue_lock;
int (*rx_action) (struct connection *); /* What to do when active */
@@ -124,10 +124,6 @@ struct connection {
struct connection *othercon;
struct work_struct rwork; /* Receive workqueue */
struct work_struct swork; /* Send workqueue */
- void (*orig_error_report)(struct sock *);
- void (*orig_data_ready)(struct sock *);
- void (*orig_state_change)(struct sock *);
- void (*orig_write_space)(struct sock *);
};
#define sock2con(x) ((struct connection *)(x)->sk_user_data)
@@ -150,6 +146,13 @@ struct dlm_node_addr {
struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
};
+static struct listen_sock_callbacks {
+ void (*sk_error_report)(struct sock *);
+ void (*sk_data_ready)(struct sock *);
+ void (*sk_state_change)(struct sock *);
+ void (*sk_write_space)(struct sock *);
+} listen_sock;
+
static LIST_HEAD(dlm_node_addrs);
static DEFINE_SPINLOCK(dlm_node_addrs_spin);
@@ -408,17 +411,23 @@ int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len)
/* Data available on socket or listen socket received a connect */
static void lowcomms_data_ready(struct sock *sk)
{
- struct connection *con = sock2con(sk);
+ struct connection *con;
+
+ read_lock_bh(&sk->sk_callback_lock);
+ con = sock2con(sk);
if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags))
queue_work(recv_workqueue, &con->rwork);
+ read_unlock_bh(&sk->sk_callback_lock);
}
static void lowcomms_write_space(struct sock *sk)
{
- struct connection *con = sock2con(sk);
+ struct connection *con;
+ read_lock_bh(&sk->sk_callback_lock);
+ con = sock2con(sk);
if (!con)
- return;
+ goto out;
clear_bit(SOCK_NOSPACE, &con->sock->flags);
@@ -427,16 +436,17 @@ static void lowcomms_write_space(struct sock *sk)
clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags);
}
- if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
- queue_work(send_workqueue, &con->swork);
+ queue_work(send_workqueue, &con->swork);
+out:
+ read_unlock_bh(&sk->sk_callback_lock);
}
static inline void lowcomms_connect_sock(struct connection *con)
{
if (test_bit(CF_CLOSE, &con->flags))
return;
- if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags))
- queue_work(send_workqueue, &con->swork);
+ queue_work(send_workqueue, &con->swork);
+ cond_resched();
}
static void lowcomms_state_change(struct sock *sk)
@@ -480,7 +490,7 @@ static void lowcomms_error_report(struct sock *sk)
if (con == NULL)
goto out;
- orig_report = con->orig_error_report;
+ orig_report = listen_sock.sk_error_report;
if (con->sock == NULL ||
kernel_getpeername(con->sock, (struct sockaddr *)&saddr, &buflen)) {
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
@@ -517,27 +527,31 @@ out:
}
/* Note: sk_callback_lock must be locked before calling this function. */
-static void save_callbacks(struct connection *con, struct sock *sk)
+static void save_listen_callbacks(struct socket *sock)
{
- con->orig_data_ready = sk->sk_data_ready;
- con->orig_state_change = sk->sk_state_change;
- con->orig_write_space = sk->sk_write_space;
- con->orig_error_report = sk->sk_error_report;
+ struct sock *sk = sock->sk;
+
+ listen_sock.sk_data_ready = sk->sk_data_ready;
+ listen_sock.sk_state_change = sk->sk_state_change;
+ listen_sock.sk_write_space = sk->sk_write_space;
+ listen_sock.sk_error_report = sk->sk_error_report;
}
-static void restore_callbacks(struct connection *con, struct sock *sk)
+static void restore_callbacks(struct socket *sock)
{
+ struct sock *sk = sock->sk;
+
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = NULL;
- sk->sk_data_ready = con->orig_data_ready;
- sk->sk_state_change = con->orig_state_change;
- sk->sk_write_space = con->orig_write_space;
- sk->sk_error_report = con->orig_error_report;
+ sk->sk_data_ready = listen_sock.sk_data_ready;
+ sk->sk_state_change = listen_sock.sk_state_change;
+ sk->sk_write_space = listen_sock.sk_write_space;
+ sk->sk_error_report = listen_sock.sk_error_report;
write_unlock_bh(&sk->sk_callback_lock);
}
/* Make a socket active */
-static void add_sock(struct socket *sock, struct connection *con, bool save_cb)
+static void add_sock(struct socket *sock, struct connection *con)
{
struct sock *sk = sock->sk;
@@ -545,8 +559,6 @@ static void add_sock(struct socket *sock, struct connection *con, bool save_cb)
con->sock = sock;
sk->sk_user_data = con;
- if (save_cb)
- save_callbacks(con, sk);
/* Install a data_ready callback */
sk->sk_data_ready = lowcomms_data_ready;
sk->sk_write_space = lowcomms_write_space;
@@ -579,17 +591,20 @@ static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
static void close_connection(struct connection *con, bool and_other,
bool tx, bool rx)
{
- clear_bit(CF_CONNECT_PENDING, &con->flags);
- clear_bit(CF_WRITE_PENDING, &con->flags);
- if (tx && cancel_work_sync(&con->swork))
+ bool closing = test_and_set_bit(CF_CLOSING, &con->flags);
+
+ if (tx && !closing && cancel_work_sync(&con->swork)) {
log_print("canceled swork for node %d", con->nodeid);
- if (rx && cancel_work_sync(&con->rwork))
+ clear_bit(CF_WRITE_PENDING, &con->flags);
+ }
+ if (rx && !closing && cancel_work_sync(&con->rwork)) {
log_print("canceled rwork for node %d", con->nodeid);
+ clear_bit(CF_READ_PENDING, &con->flags);
+ }
mutex_lock(&con->sock_mutex);
if (con->sock) {
- if (!test_bit(CF_IS_OTHERCON, &con->flags))
- restore_callbacks(con, con->sock->sk);
+ restore_callbacks(con->sock);
sock_release(con->sock);
con->sock = NULL;
}
@@ -604,6 +619,7 @@ static void close_connection(struct connection *con, bool and_other,
con->retries = 0;
mutex_unlock(&con->sock_mutex);
+ clear_bit(CF_CLOSING, &con->flags);
}
/* Data received from remote end */
@@ -700,7 +716,7 @@ out_resched:
out_close:
mutex_unlock(&con->sock_mutex);
if (ret != -EAGAIN) {
- close_connection(con, false, true, false);
+ close_connection(con, true, true, false);
/* Reconnect when there is something to send */
}
/* Don't return success if we really got EOF */
@@ -728,22 +744,14 @@ static int tcp_accept_from_sock(struct connection *con)
}
mutex_unlock(&connections_lock);
- memset(&peeraddr, 0, sizeof(peeraddr));
- result = sock_create_lite(dlm_local_addr[0]->ss_family,
- SOCK_STREAM, IPPROTO_TCP, &newsock);
- if (result < 0)
- return -ENOMEM;
-
mutex_lock_nested(&con->sock_mutex, 0);
- result = -ENOTCONN;
- if (con->sock == NULL)
- goto accept_err;
-
- newsock->type = con->sock->type;
- newsock->ops = con->sock->ops;
+ if (!con->sock) {
+ mutex_unlock(&con->sock_mutex);
+ return -ENOTCONN;
+ }
- result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK, true);
+ result = kernel_accept(con->sock, &newsock, O_NONBLOCK);
if (result < 0)
goto accept_err;
@@ -794,31 +802,33 @@ static int tcp_accept_from_sock(struct connection *con)
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
+ INIT_LIST_HEAD(&othercon->writequeue);
+ spin_lock_init(&othercon->writequeue_lock);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
}
+ mutex_lock_nested(&othercon->sock_mutex, 2);
if (!othercon->sock) {
newcon->othercon = othercon;
- othercon->sock = newsock;
- newsock->sk->sk_user_data = othercon;
- add_sock(newsock, othercon, false);
+ add_sock(newsock, othercon);
addcon = othercon;
+ mutex_unlock(&othercon->sock_mutex);
}
else {
printk("Extra connection from node %d attempted\n", nodeid);
result = -EAGAIN;
+ mutex_unlock(&othercon->sock_mutex);
mutex_unlock(&newcon->sock_mutex);
goto accept_err;
}
}
else {
- newsock->sk->sk_user_data = newcon;
newcon->rx_action = receive_from_sock;
/* accept copies the sk after we've saved the callbacks, so we
don't want to save them a second time or comm errors will
result in calling sk_error_report recursively. */
- add_sock(newsock, newcon, false);
+ add_sock(newsock, newcon);
addcon = newcon;
}
@@ -837,7 +847,8 @@ static int tcp_accept_from_sock(struct connection *con)
accept_err:
mutex_unlock(&con->sock_mutex);
- sock_release(newsock);
+ if (newsock)
+ sock_release(newsock);
if (result != -EAGAIN)
log_print("error accepting connection from node: %d", result);
@@ -911,26 +922,28 @@ static int sctp_accept_from_sock(struct connection *con)
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
+ INIT_LIST_HEAD(&othercon->writequeue);
+ spin_lock_init(&othercon->writequeue_lock);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
}
+ mutex_lock_nested(&othercon->sock_mutex, 2);
if (!othercon->sock) {
newcon->othercon = othercon;
- othercon->sock = newsock;
- newsock->sk->sk_user_data = othercon;
- add_sock(newsock, othercon, false);
+ add_sock(newsock, othercon);
addcon = othercon;
+ mutex_unlock(&othercon->sock_mutex);
} else {
printk("Extra connection from node %d attempted\n", nodeid);
ret = -EAGAIN;
+ mutex_unlock(&othercon->sock_mutex);
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, false);
+ add_sock(newsock, newcon);
addcon = newcon;
}
@@ -1055,10 +1068,9 @@ static void sctp_connect_to_sock(struct connection *con)
if (result < 0)
goto socket_err;
- sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
con->connect_action = sctp_connect_to_sock;
- add_sock(sock, con, true);
+ add_sock(sock, con);
/* Bind to all addresses. */
if (sctp_bind_addrs(con, 0))
@@ -1079,7 +1091,6 @@ static void sctp_connect_to_sock(struct connection *con)
if (result == 0)
goto out;
-
bind_err:
con->sock = NULL;
sock_release(sock);
@@ -1098,14 +1109,12 @@ socket_err:
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 */
@@ -1143,10 +1152,9 @@ static void tcp_connect_to_sock(struct connection *con)
goto out_err;
}
- sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
con->connect_action = tcp_connect_to_sock;
- add_sock(sock, con, true);
+ add_sock(sock, con);
/* Bind to our cluster-known address connecting to avoid
routing problems */
@@ -1194,13 +1202,11 @@ out_err:
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;
}
@@ -1235,10 +1241,12 @@ static struct socket *tcp_create_listen_sock(struct connection *con,
if (result < 0) {
log_print("Failed to set SO_REUSEADDR on socket: %d", result);
}
+ write_lock_bh(&sock->sk->sk_callback_lock);
sock->sk->sk_user_data = con;
-
+ save_listen_callbacks(sock);
con->rx_action = tcp_accept_from_sock;
con->connect_action = tcp_connect_to_sock;
+ write_unlock_bh(&sock->sk->sk_callback_lock);
/* Bind to our port */
make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len);
@@ -1320,6 +1328,7 @@ static int sctp_listen_for_all(void)
write_lock_bh(&sock->sk->sk_callback_lock);
/* Init con struct */
sock->sk->sk_user_data = con;
+ save_listen_callbacks(sock);
con->sock = sock;
con->sock->sk->sk_data_ready = lowcomms_data_ready;
con->rx_action = sctp_accept_from_sock;
@@ -1366,7 +1375,7 @@ static int tcp_listen_for_all(void)
sock = tcp_create_listen_sock(con, dlm_local_addr[0]);
if (sock) {
- add_sock(sock, con, true);
+ add_sock(sock, con);
result = 0;
}
else {
@@ -1456,9 +1465,7 @@ void dlm_lowcomms_commit_buffer(void *mh)
e->len = e->end - e->offset;
spin_unlock(&con->writequeue_lock);
- if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) {
- queue_work(send_workqueue, &con->swork);
- }
+ queue_work(send_workqueue, &con->swork);
return;
out:
@@ -1527,13 +1534,16 @@ out:
send_error:
mutex_unlock(&con->sock_mutex);
- close_connection(con, false, false, true);
- lowcomms_connect_sock(con);
+ close_connection(con, true, false, true);
+ /* Requeue the send work. When the work daemon runs again, it will try
+ a new connection, then call this function again. */
+ queue_work(send_workqueue, &con->swork);
return;
out_connect:
mutex_unlock(&con->sock_mutex);
- lowcomms_connect_sock(con);
+ queue_work(send_workqueue, &con->swork);
+ cond_resched();
}
static void clean_one_writequeue(struct connection *con)
@@ -1593,9 +1603,10 @@ 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))
+ clear_bit(CF_WRITE_PENDING, &con->flags);
+ if (con->sock == NULL) /* not mutex protected so check it inside too */
con->connect_action(con);
- if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags))
+ if (!list_empty(&con->writequeue))
send_to_sock(con);
}
@@ -1632,11 +1643,25 @@ static int work_start(void)
return 0;
}
-static void stop_conn(struct connection *con)
+static void _stop_conn(struct connection *con, bool and_other)
{
- con->flags |= 0x0F;
- if (con->sock && con->sock->sk)
+ mutex_lock(&con->sock_mutex);
+ set_bit(CF_CLOSE, &con->flags);
+ set_bit(CF_READ_PENDING, &con->flags);
+ set_bit(CF_WRITE_PENDING, &con->flags);
+ if (con->sock && con->sock->sk) {
+ write_lock_bh(&con->sock->sk->sk_callback_lock);
con->sock->sk->sk_user_data = NULL;
+ write_unlock_bh(&con->sock->sk->sk_callback_lock);
+ }
+ if (con->othercon && and_other)
+ _stop_conn(con->othercon, false);
+ mutex_unlock(&con->sock_mutex);
+}
+
+static void stop_conn(struct connection *con)
+{
+ _stop_conn(con, true);
}
static void free_conn(struct connection *con)
@@ -1648,6 +1673,36 @@ static void free_conn(struct connection *con)
kmem_cache_free(con_cache, con);
}
+static void work_flush(void)
+{
+ int ok;
+ int i;
+ struct hlist_node *n;
+ struct connection *con;
+
+ flush_workqueue(recv_workqueue);
+ flush_workqueue(send_workqueue);
+ do {
+ ok = 1;
+ foreach_conn(stop_conn);
+ flush_workqueue(recv_workqueue);
+ flush_workqueue(send_workqueue);
+ for (i = 0; i < CONN_HASH_SIZE && ok; i++) {
+ hlist_for_each_entry_safe(con, n,
+ &connection_hash[i], list) {
+ ok &= test_bit(CF_READ_PENDING, &con->flags);
+ ok &= test_bit(CF_WRITE_PENDING, &con->flags);
+ if (con->othercon) {
+ ok &= test_bit(CF_READ_PENDING,
+ &con->othercon->flags);
+ ok &= test_bit(CF_WRITE_PENDING,
+ &con->othercon->flags);
+ }
+ }
+ }
+ } while (!ok);
+}
+
void dlm_lowcomms_stop(void)
{
/* Set all the flags to prevent any
@@ -1655,11 +1710,10 @@ void dlm_lowcomms_stop(void)
*/
mutex_lock(&connections_lock);
dlm_allow_conn = 0;
- foreach_conn(stop_conn);
+ mutex_unlock(&connections_lock);
+ work_flush();
clean_writequeues();
foreach_conn(free_conn);
- mutex_unlock(&connections_lock);
-
work_stop();
kmem_cache_destroy(con_cache);
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index f3f5e72a29ba..70c625999d36 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -155,6 +155,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
goto out;
}
+retry:
error = create_rcom(ls, nodeid, DLM_RCOM_STATUS,
sizeof(struct rcom_status), &rc, &mh);
if (error)
@@ -169,6 +170,8 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
error = dlm_wait_function(ls, &rcom_response);
disallow_sync_reply(ls);
+ if (error == -ETIMEDOUT)
+ goto retry;
if (error)
goto out;
@@ -276,6 +279,7 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
ls->ls_recover_nodeid = nodeid;
+retry:
error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
if (error)
goto out;
@@ -288,6 +292,8 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
error = dlm_wait_function(ls, &rcom_response);
disallow_sync_reply(ls);
+ if (error == -ETIMEDOUT)
+ goto retry;
out:
return error;
}
@@ -332,25 +338,6 @@ int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
return error;
}
-int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid)
-{
- struct dlm_rcom *rc;
- struct dlm_mhandle *mh;
- struct dlm_ls *ls = r->res_ls;
- int error;
-
- error = create_rcom(ls, to_nodeid, DLM_RCOM_LOOKUP, r->res_length,
- &rc, &mh);
- if (error)
- goto out;
- memcpy(rc->rc_buf, r->res_name, r->res_length);
- rc->rc_id = 0xFFFFFFFF;
-
- send_rcom(ls, mh, rc);
- out:
- return error;
-}
-
static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
struct dlm_rcom *rc;
@@ -362,6 +349,7 @@ static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
if (error)
return;
+ /* Old code would send this special id to trigger a debug dump. */
if (rc_in->rc_id == 0xFFFFFFFF) {
log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
diff --git a/fs/dlm/rcom.h b/fs/dlm/rcom.h
index f8e243463c15..206723ab744d 100644
--- a/fs/dlm/rcom.h
+++ b/fs/dlm/rcom.h
@@ -17,7 +17,6 @@
int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags);
int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,int last_len);
int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid);
-int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid);
int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid);
int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in);
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index eaea789bf97d..ce2aa54ca2e2 100644
--- a/fs/dlm/recover.c
+++ b/fs/dlm/recover.c
@@ -52,6 +52,10 @@ int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
dlm_config.ci_recover_timer * HZ);
if (rv)
break;
+ if (test_bit(LSFL_RCOM_WAIT, &ls->ls_flags)) {
+ log_debug(ls, "dlm_wait_function timed out");
+ return -ETIMEDOUT;
+ }
}
if (dlm_recovery_stopped(ls)) {
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c
index 6859b4bf971e..6f4e1d42d733 100644
--- a/fs/dlm/recoverd.c
+++ b/fs/dlm/recoverd.c
@@ -287,11 +287,23 @@ static int dlm_recoverd(void *arg)
set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags);
wake_up(&ls->ls_recover_lock_wait);
- while (!kthread_should_stop()) {
+ while (1) {
+ /*
+ * We call kthread_should_stop() after set_current_state().
+ * This is because it works correctly if kthread_stop() is
+ * called just before set_current_state().
+ */
set_current_state(TASK_INTERRUPTIBLE);
+ if (kthread_should_stop()) {
+ set_current_state(TASK_RUNNING);
+ break;
+ }
if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) &&
- !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags))
+ !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) {
+ if (kthread_should_stop())
+ break;
schedule();
+ }
set_current_state(TASK_RUNNING);
if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) {