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Message-ID: <20111214104610.3991.15646.stgit@localhost6.localdomain6>
Date: Wed, 14 Dec 2011 14:46:10 +0300
From: Stanislav Kinsbursky <skinsbursky@...allels.com>
To: Trond.Myklebust@...app.com
Cc: linux-nfs@...r.kernel.org, xemul@...allels.com, neilb@...e.de,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
jbottomley@...allels.com, bfields@...ldses.org,
davem@...emloft.net, devel@...nvz.org
Subject: [PATCH 11/11] SUNRPC: sysctl table for rpc_debug introduced
This patch provides showing of pending RPC tasks for right namespace in case of
write oparation to "rpc_debug" sysctl.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
---
include/linux/sunrpc/sched.h | 1
net/sunrpc/netns.h | 1
net/sunrpc/sysctl.c | 87 +++++++++++++++++++++++++++++++++++++-----
3 files changed, 77 insertions(+), 12 deletions(-)
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index b16243a..02f5fce 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -244,7 +244,6 @@ int rpciod_up(void);
void rpciod_down(void);
int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(void *));
#ifdef RPC_DEBUG
-struct net;
void rpc_show_tasks(struct net *);
#endif
int rpc_init_mempool(void);
diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index 23d110d..0926705 100644
--- a/net/sunrpc/netns.h
+++ b/net/sunrpc/netns.h
@@ -16,6 +16,7 @@ struct sunrpc_net {
struct ctl_table_set sysctls;
struct ctl_table_header *debug_ctl_header;
struct ctl_table_header *xs_tunables_header;
+ struct ctl_table_header *rpc_debug_ctl_header;
#endif
unsigned int xprt_udp_slot_table_entries;
unsigned int xprt_tcp_slot_table_entries;
diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c
index 224b075..52f6fb5 100644
--- a/net/sunrpc/sysctl.c
+++ b/net/sunrpc/sysctl.c
@@ -44,6 +44,15 @@ EXPORT_SYMBOL_GPL(nlm_debug);
static ctl_table debug_table[];
+static ctl_table rpc_debug_table[] = {
+ {
+ .procname = "rpc_debug",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ },
+ { }
+};
+
struct ctl_path sunrpc_path[] = {
{ .procname = "sunrpc", },
{ },
@@ -73,6 +82,48 @@ struct ctl_table_header *register_sunrpc_sysctl(struct net *net,
}
EXPORT_SYMBOL_GPL(register_sunrpc_sysctl);
+static int proc_rpcdebug(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+
+static int register_rpc_debug_table(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct ctl_table *table;
+
+ table = rpc_debug_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(rpc_debug_table, sizeof(rpc_debug_table),
+ GFP_KERNEL);
+ if (table == NULL)
+ goto err_alloc;
+ }
+ table[0].data = net;
+ table[0].proc_handler = proc_rpcdebug;
+
+ sn->rpc_debug_ctl_header = register_sunrpc_sysctl(net, table);
+ if (sn->rpc_debug_ctl_header == NULL)
+ goto err_reg;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void unregister_rpc_debug_table(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct ctl_table *table;
+
+ table = sn->rpc_debug_ctl_header->ctl_table_arg;
+ unregister_sysctl_table(sn->rpc_debug_ctl_header);
+ sn->rpc_debug_ctl_header = NULL;
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
int debug_sysctl_init(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
@@ -80,14 +131,23 @@ int debug_sysctl_init(struct net *net)
setup_sysctl_set(&sn->sysctls, NULL, NULL);
sn->debug_ctl_header = register_sunrpc_sysctl(net, debug_table);
if (sn->debug_ctl_header == NULL)
- return -ENOMEM;
+ goto err_debug;
+ if (register_rpc_debug_table(net) < 0)
+ goto err_rpc_debug;
return 0;
+
+err_rpc_debug:
+ unregister_sysctl_table(sn->debug_ctl_header);
+ sn->debug_ctl_header = NULL;
+err_debug:
+ return -ENOMEM;
}
void debug_sysctl_exit(struct net *net)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ unregister_rpc_debug_table(net);
unregister_sysctl_table(sn->debug_ctl_header);
sn->debug_ctl_header = NULL;
WARN_ON(!list_empty(&sn->sysctls.list));
@@ -158,9 +218,6 @@ proc_dodebug(ctl_table *table, int write,
left--, s++;
if (net_eq(current->nsproxy->net_ns, &init_net))
*(unsigned int *) table->data = value;
- /* Display the RPC tasks on writing to rpc_debug */
- if (strcmp(table->procname, "rpc_debug") == 0)
- rpc_show_tasks(&init_net);
} else {
if (!access_ok(VERIFY_WRITE, buffer, left))
return -EFAULT;
@@ -183,15 +240,23 @@ done:
}
+static int
+proc_rpcdebug(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int err;
+ struct ctl_table tmp = *table;
+
+ tmp.data = &rpc_debug;
+ err = proc_dodebug(&tmp, write, buffer, lenp, ppos);
+ if (!err && write)
+ /* Display the RPC tasks on writing to rpc_debug */
+ rpc_show_tasks(table->data);
+ return err;
+}
+
static ctl_table debug_table[] = {
{
- .procname = "rpc_debug",
- .data = &rpc_debug,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dodebug
- },
- {
.procname = "nfs_debug",
.data = &nfs_debug,
.maxlen = sizeof(int),
--
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