From dbef1c05341b1eb4912154cc32bc1a8b64ac0f59 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen@networkplumber.org>
Date: Wed, 31 Aug 2016 10:26:28 -0700
Subject: [PATCH 1/6] dlm: make genl_ops const
This table contains function points and should be const.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/netlink.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index 1e6e227134d7..934ab0640610 100644
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -69,7 +69,7 @@ static int user_cmd(struct sk_buff *skb, struct genl_info *info)
return 0;
}
-static struct genl_ops dlm_nl_ops[] = {
+static const struct genl_ops dlm_nl_ops[] = {
{
.cmd = DLM_CMD_HELLO,
.doit = user_cmd,
From 7963b8a59845eabafa0e8ff330a2e0884f0279a9 Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Mon, 19 Sep 2016 16:44:50 -0400
Subject: [PATCH 2/6] dlm: audit and remove any unnecessary uses of module.h
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends. That changed
when we forked out support for the latter into the export.h file.
This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.
In the case of some code where it is modular, we can extend that to
also include files that are building basic support functionality but
not related to loading or registering the final module; such files
also have no need whatsoever for module.h
The advantage in removing such instances is that module.h itself
sources about 15 other headers; adding significantly to what we feed
cpp, and it can obscure what headers we are effectively using.
Since module.h might have been the implicit source for init.h
(for __init) and for export.h (for EXPORT_SYMBOL) we consider each
instance for the presence of either and replace as needed.
In the dlm case, we remove module.h from a global header and only
introduce it in the files where it is explicitly required, since
there is nothing modular in dlm_internal.h itself.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/config.c | 2 +-
fs/dlm/debug_fs.c | 2 +-
fs/dlm/dlm_internal.h | 1 -
fs/dlm/lockspace.c | 2 ++
fs/dlm/main.c | 2 ++
fs/dlm/user.c | 1 -
6 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index df955d2209ce..7211e826d90d 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -12,7 +12,7 @@
******************************************************************************/
#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/init.h>
#include <linux/configfs.h>
#include <linux/slab.h>
#include <linux/in.h>
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 466f7d60edc2..ca7089aeadab 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -12,7 +12,7 @@
#include <linux/pagemap.h>
#include <linux/seq_file.h>
-#include <linux/module.h>
+#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 216b61604ef9..b670f5601fbb 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -18,7 +18,6 @@
* This is the main header file to be included in each DLM source file.
*/
-#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index f3e72787e7f9..91592b75c309 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -11,6 +11,8 @@
*******************************************************************************
******************************************************************************/
+#include <linux/module.h>
+
#include "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
diff --git a/fs/dlm/main.c b/fs/dlm/main.c
index 079c0bd71ab7..8e1b618891be 100644
--- a/fs/dlm/main.c
+++ b/fs/dlm/main.c
@@ -11,6 +11,8 @@
*******************************************************************************
******************************************************************************/
+#include <linux/module.h>
+
#include "dlm_internal.h"
#include "lockspace.h"
#include "lock.h"
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 58c2f4a21b7f..1ce908c2232c 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -9,7 +9,6 @@
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/wait.h>
-#include <linux/module.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/poll.h>
From 3735b4b9f1c102dcaf70241225339bdea4447dc8 Mon Sep 17 00:00:00 2001
From: Bob Peterson <rpeterso@redhat.com>
Date: Fri, 23 Sep 2016 14:23:26 -0400
Subject: [PATCH 3/6] dlm: don't save callbacks after accept
When DLM calls accept() on a socket, the comm code copies the sk
after we've saved its callbacks. Afterward, it calls add_sock which
saves the callbacks a second time. Since the error reporting function
lowcomms_error_report calls the previous callback too, this results
in a recursive call to itself. This patch adds a new parameter to
function add_sock to tell whether to save the callbacks. Function
tcp_accept_from_sock (and its sctp counterpart) then calls it with
false to avoid the recursion.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/lowcomms.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 609998de533e..485494e5a28e 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -541,7 +541,7 @@ static void restore_callbacks(struct connection *con, struct sock *sk)
}
/* Make a socket active */
-static void add_sock(struct socket *sock, struct connection *con)
+static void add_sock(struct socket *sock, struct connection *con, bool save_cb)
{
struct sock *sk = sock->sk;
@@ -549,7 +549,7 @@ static void add_sock(struct socket *sock, struct connection *con)
con->sock = sock;
sk->sk_user_data = con;
- if (!test_bit(CF_IS_OTHERCON, &con->flags))
+ if (save_cb)
save_callbacks(con, sk);
/* Install a data_ready callback */
sk->sk_data_ready = lowcomms_data_ready;
@@ -806,7 +806,7 @@ static int tcp_accept_from_sock(struct connection *con)
newcon->othercon = othercon;
othercon->sock = newsock;
newsock->sk->sk_user_data = othercon;
- add_sock(newsock, othercon);
+ add_sock(newsock, othercon, false);
addcon = othercon;
}
else {
@@ -819,7 +819,10 @@ static int tcp_accept_from_sock(struct connection *con)
else {
newsock->sk->sk_user_data = newcon;
newcon->rx_action = receive_from_sock;
- add_sock(newsock, newcon);
+ /* 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);
addcon = newcon;
}
@@ -919,7 +922,7 @@ static int sctp_accept_from_sock(struct connection *con)
newcon->othercon = othercon;
othercon->sock = newsock;
newsock->sk->sk_user_data = othercon;
- add_sock(newsock, othercon);
+ add_sock(newsock, othercon, false);
addcon = othercon;
} else {
printk("Extra connection from node %d attempted\n", nodeid);
@@ -930,7 +933,7 @@ static int sctp_accept_from_sock(struct connection *con)
} else {
newsock->sk->sk_user_data = newcon;
newcon->rx_action = receive_from_sock;
- add_sock(newsock, newcon);
+ add_sock(newsock, newcon, false);
addcon = newcon;
}
@@ -1058,7 +1061,7 @@ static void sctp_connect_to_sock(struct connection *con)
sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
con->connect_action = sctp_connect_to_sock;
- add_sock(sock, con);
+ add_sock(sock, con, true);
/* Bind to all addresses. */
if (sctp_bind_addrs(con, 0))
@@ -1146,7 +1149,7 @@ static void tcp_connect_to_sock(struct connection *con)
sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
con->connect_action = tcp_connect_to_sock;
- add_sock(sock, con);
+ add_sock(sock, con, true);
/* Bind to our cluster-known address connecting to avoid
routing problems */
@@ -1366,7 +1369,7 @@ static int tcp_listen_for_all(void)
sock = tcp_create_listen_sock(con, dlm_local_addr[0]);
if (sock) {
- add_sock(sock, con);
+ add_sock(sock, con, true);
result = 0;
}
else {
From d2fee58a3bb15b2b8f1eaff14aa3432cf0f35d8c Mon Sep 17 00:00:00 2001
From: Bob Peterson <rpeterso@redhat.com>
Date: Mon, 10 Oct 2016 09:19:52 -0400
Subject: [PATCH 4/6] dlm: remove lock_sock to avoid scheduling while atomic
Before this patch, functions save_callbacks and restore_callbacks
called function lock_sock and release_sock to prevent other processes
from messing with the struct sock while the callbacks were saved and
restored. However, function add_sock calls write_lock_bh prior to
calling it save_callbacks, which disables preempts. So the call to
lock_sock would try to schedule when we can't schedule.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/lowcomms.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 485494e5a28e..df680a26141b 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -519,24 +519,20 @@ out:
/* Note: sk_callback_lock must be locked before calling this function. */
static void save_callbacks(struct connection *con, struct sock *sk)
{
- lock_sock(sk);
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;
- release_sock(sk);
}
static void restore_callbacks(struct connection *con, struct sock *sk)
{
write_lock_bh(&sk->sk_callback_lock);
- lock_sock(sk);
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;
- release_sock(sk);
write_unlock_bh(&sk->sk_callback_lock);
}
From aa9f1012858bc7f44368f1e4453c989d873b0860 Mon Sep 17 00:00:00 2001
From: Bob Peterson <rpeterso@redhat.com>
Date: Wed, 19 Oct 2016 11:34:54 -0400
Subject: [PATCH 5/6] dlm: don't specify WQ_UNBOUND for the ast callback
workqueue
This patch removes the WQ_UNBOUND flag (which implies WQ_HIGHPRI)
from the DLM's ast work queue, in favor of just WQ_HIGHPRI.
This has been shown to cause a 19 percent performance increase for
simultaneous inode creates on GFS2 with fs_mark.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/ast.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index dcea1e37a1b7..07fed838d8fd 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -268,7 +268,7 @@ void dlm_callback_work(struct work_struct *work)
int dlm_callback_start(struct dlm_ls *ls)
{
ls->ls_callback_wq = alloc_workqueue("dlm_callback",
- WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
+ WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
if (!ls->ls_callback_wq) {
log_print("can't start dlm_callback workqueue");
return -ENOMEM;
From 26c1ec2fe410ba861f15ebbfc9f44f907a41b6ff Mon Sep 17 00:00:00 2001
From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Sat, 22 Oct 2016 14:37:36 +0000
Subject: [PATCH 6/6] dlm: fix error return code in sctp_accept_from_sock()
Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David Teigland <teigland@redhat.com>
---
fs/dlm/lowcomms.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index df680a26141b..7d398d300e97 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -879,7 +879,8 @@ static int sctp_accept_from_sock(struct connection *con)
}
make_sockaddr(&prim.ssp_addr, 0, &addr_len);
- if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) {
+ ret = addr_to_nodeid(&prim.ssp_addr, &nodeid);
+ if (ret) {
unsigned char *b = (unsigned char *)&prim.ssp_addr;
log_print("reject connect from unknown addr");