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Message-Id: <1436843877-28258-2-git-send-email-green@linuxhacker.ru>
Date: Mon, 13 Jul 2015 23:17:54 -0400
From: green@...uxhacker.ru
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
devel@...verdev.osuosl.org,
Andreas Dilger <andreas.dilger@...el.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Oleg Drokin <green@...uxhacker.ru>
Subject: [PATCH 1/4] staging/lustre/libcfs: get rid of debugfs/lnet/debug_mb
From: Oleg Drokin <green@...uxhacker.ru>
It's just a fancy libcfs_debug_mb module parameter wrapper,
so just add debug buffer size check and resizing and the same
functionality now would be accessible via
/sys/module/libcfs/parameters/libcfs_debug_mb
Also add a symlink for backwards compatibility.
Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
---
drivers/staging/lustre/lustre/libcfs/debug.c | 40 ++++++++++++++++++++++--
drivers/staging/lustre/lustre/libcfs/module.c | 32 ++-----------------
drivers/staging/lustre/lustre/libcfs/tracefile.c | 12 -------
drivers/staging/lustre/lustre/libcfs/tracefile.h | 1 -
4 files changed, 40 insertions(+), 45 deletions(-)
diff --git a/drivers/staging/lustre/lustre/libcfs/debug.c b/drivers/staging/lustre/lustre/libcfs/debug.c
index 5ae7b65..995a1e3 100644
--- a/drivers/staging/lustre/lustre/libcfs/debug.c
+++ b/drivers/staging/lustre/lustre/libcfs/debug.c
@@ -57,8 +57,42 @@ module_param(libcfs_debug, int, 0644);
MODULE_PARM_DESC(libcfs_debug, "Lustre kernel debug mask");
EXPORT_SYMBOL(libcfs_debug);
+static int libcfs_param_debug_mb_set(const char *val,
+ const struct kernel_param *kp)
+{
+ int rc;
+ unsigned num;
+
+ rc = kstrtouint(val, 0, &num);
+ if (rc < 0)
+ return rc;
+
+ if (!*((unsigned int *)kp->arg)) {
+ *((unsigned int *)kp->arg) = num;
+ return 0;
+ }
+
+ rc = cfs_trace_set_debug_mb(num);
+
+ if (!rc)
+ *((unsigned int *)kp->arg) = cfs_trace_get_debug_mb();
+
+ return rc;
+}
+
+/* While debug_mb setting look like unsigned int, in fact
+ * it needs quite a bunch of extra processing, so we define special
+ * debugmb parameter type with corresponding methods to handle this case */
+static struct kernel_param_ops param_ops_debugmb = {
+ .set = libcfs_param_debug_mb_set,
+ .get = param_get_uint,
+};
+
+#define param_check_debugmb(name, p) \
+ __param_check(name, p, unsigned int)
+
static unsigned int libcfs_debug_mb;
-module_param(libcfs_debug_mb, uint, 0644);
+module_param(libcfs_debug_mb, debugmb, 0644);
MODULE_PARM_DESC(libcfs_debug_mb, "Total debug buffer size.");
EXPORT_SYMBOL(libcfs_debug_mb);
@@ -437,8 +471,10 @@ int libcfs_debug_init(unsigned long bufsize)
}
rc = cfs_tracefile_init(max);
- if (rc == 0)
+ if (rc == 0) {
libcfs_register_panic_notifier();
+ libcfs_debug_mb = cfs_trace_get_debug_mb();
+ }
return rc;
}
diff --git a/drivers/staging/lustre/lustre/libcfs/module.c b/drivers/staging/lustre/lustre/libcfs/module.c
index 8e228ae..acfe778 100644
--- a/drivers/staging/lustre/lustre/libcfs/module.c
+++ b/drivers/staging/lustre/lustre/libcfs/module.c
@@ -550,31 +550,6 @@ static int proc_daemon_file(struct ctl_table *table, int write,
__proc_daemon_file);
}
-static int __proc_debug_mb(void *data, int write,
- loff_t pos, void __user *buffer, int nob)
-{
- if (!write) {
- char tmpstr[32];
- int len = snprintf(tmpstr, sizeof(tmpstr), "%d",
- cfs_trace_get_debug_mb());
-
- if (pos >= len)
- return 0;
-
- return cfs_trace_copyout_string(buffer, nob, tmpstr + pos,
- "\n");
- }
-
- return cfs_trace_set_debug_mb_usrstr(buffer, nob);
-}
-
-static int proc_debug_mb(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return proc_call_handler(table->data, write, ppos, buffer, lenp,
- __proc_debug_mb);
-}
-
static int proc_console_max_delay_cs(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
@@ -790,11 +765,6 @@ static struct ctl_table lnet_table[] = {
.proc_handler = &proc_daemon_file,
},
{
- .procname = "debug_mb",
- .mode = 0644,
- .proc_handler = &proc_debug_mb,
- },
- {
.procname = "force_lbug",
.data = NULL,
.maxlen = 0,
@@ -833,6 +803,8 @@ struct lnet_debugfs_symlink_def lnet_debugfs_symlinks[] = {
"/sys/module/libcfs/parameters/libcfs_panic_on_lbug"},
{ "libcfs_console_backoff",
"/sys/module/libcfs/parameters/libcfs_console_backoff"},
+ { "debug_mb",
+ "/sys/module/libcfs/parameters/libcfs_debug_mb"},
{},
};
diff --git a/drivers/staging/lustre/lustre/libcfs/tracefile.c b/drivers/staging/lustre/lustre/libcfs/tracefile.c
index 6ee2adc..effa2af 100644
--- a/drivers/staging/lustre/lustre/libcfs/tracefile.c
+++ b/drivers/staging/lustre/lustre/libcfs/tracefile.c
@@ -937,18 +937,6 @@ int cfs_trace_set_debug_mb(int mb)
return 0;
}
-int cfs_trace_set_debug_mb_usrstr(void __user *usr_str, int usr_str_nob)
-{
- char str[32];
- int rc;
-
- rc = cfs_trace_copyin_string(str, sizeof(str), usr_str, usr_str_nob);
- if (rc < 0)
- return rc;
-
- return cfs_trace_set_debug_mb(simple_strtoul(str, NULL, 0));
-}
-
int cfs_trace_get_debug_mb(void)
{
int i;
diff --git a/drivers/staging/lustre/lustre/libcfs/tracefile.h b/drivers/staging/lustre/lustre/libcfs/tracefile.h
index 0601476..8d993f4 100644
--- a/drivers/staging/lustre/lustre/libcfs/tracefile.h
+++ b/drivers/staging/lustre/lustre/libcfs/tracefile.h
@@ -77,7 +77,6 @@ int cfs_trace_dump_debug_buffer_usrstr(void __user *usr_str, int usr_str_nob);
int cfs_trace_daemon_command(char *str);
int cfs_trace_daemon_command_usrstr(void __user *usr_str, int usr_str_nob);
int cfs_trace_set_debug_mb(int mb);
-int cfs_trace_set_debug_mb_usrstr(void __user *usr_str, int usr_str_nob);
int cfs_trace_get_debug_mb(void);
extern void libcfs_debug_dumplog_internal(void *arg);
--
2.1.0
--
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