This patch implements the basic sysfs support for 9p. If CONFIG_NET_9P_DEBUG
is defined, allows reading and modifying the debug level via
/sysfs/fs/9p/debuglevel.
Signed-off-by: Latchesar Ionkov <[email protected]>
---
include/net/9p/9p.h | 1 +
net/9p/mod.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 686425a..9ace484 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -377,6 +377,7 @@ struct p9_fcall {
};
struct p9_idpool;
+extern struct kset p9_subsys;
int p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
int dotu);
diff --git a/net/9p/mod.c b/net/9p/mod.c
index 41d70f4..8205c4b 100644
--- a/net/9p/mod.c
+++ b/net/9p/mod.c
@@ -29,6 +29,7 @@
#include <net/9p/9p.h>
#include <linux/fs.h>
#include <linux/parser.h>
+#include <linux/fs.h>
#include <net/9p/transport.h>
#include <linux/list.h>
@@ -37,8 +38,17 @@ unsigned int p9_debug_level = 0; /* feature-rific global debug level */
EXPORT_SYMBOL(p9_debug_level);
module_param_named(debug, p9_debug_level, uint, 0);
MODULE_PARM_DESC(debug, "9P debugging level");
+
+static ssize_t p9_debug_show(struct kset *, char *);
+static ssize_t p9_debug_store(struct kset *, const char *, size_t);
+
+static struct subsys_attribute p9_debug_attr = __ATTR(debuglevel, 0644,
+ p9_debug_show, p9_debug_store);
#endif
+decl_subsys_name(p9, 9p, NULL, NULL);
+EXPORT_SYMBOL(p9_subsys);
+
extern int p9_mux_global_init(void);
extern void p9_mux_global_exit(void);
@@ -99,6 +109,27 @@ struct p9_trans_module *v9fs_default_trans(void)
}
EXPORT_SYMBOL(v9fs_default_trans);
+#ifdef CONFIG_NET_9P_DEBUG
+
+static ssize_t p9_debug_show(struct kset *k, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", p9_debug_level);
+}
+
+static ssize_t p9_debug_store(struct kset *k, const char *buf, size_t buflen)
+{
+ int n;
+ char *p;
+
+ n = simple_strtol(buf, &p, 0);
+ if (*p != '\n' && *p != '\0')
+ return EINVAL;
+
+ p9_debug_level = n;
+ return buflen;
+}
+
+#endif
/**
* v9fs_init - Initialize module
@@ -109,6 +140,19 @@ static int __init init_p9(void)
int ret;
p9_error_init();
+ kobj_set_kset_s(&p9_subsys, fs_subsys);
+ ret = subsystem_register(&p9_subsys);
+ if (ret)
+ return ret;
+
+#ifdef CONFIG_NET_9P_DEBUG
+ ret = subsys_create_file(&p9_subsys, &p9_debug_attr);
+ if (ret) {
+ subsystem_unregister(&p9_subsys);
+ return ret;
+ }
+#endif
+
printk(KERN_INFO "Installing 9P2000 support\n");
ret = p9_mux_global_init();
if (ret) {
@@ -127,6 +171,7 @@ static int __init init_p9(void)
static void __exit exit_p9(void)
{
p9_mux_global_exit();
+ subsystem_unregister(&p9_subsys);
}
module_init(init_p9)
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