scoutfs: add options debugfs dir

Add a debugfs dir that will offer debugging options for an actively
mounted volume.

Signed-off-by: Zach Brown <zab@versity.com>

kmod/src/options.c

@@ -14,6 +14,8 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
 
 #include <linux/parser.h>
 #include <linux/inet.h>
@@ -22,12 +24,7 @@
 
 #include "msg.h"
 #include "options.h"
-
-enum {
-	Opt_listen = 0,
-	Opt_cluster,
-	Opt_err,
-};
+#include "super.h"
 
 static const match_table_t tokens = {
 	{Opt_listen, "listen=%s"},
@@ -35,6 +32,20 @@ static const match_table_t tokens = {
 	{Opt_err, NULL}
 };
 
+struct options_sb_info {
+	struct dentry *debugfs_dir;
+};
+
+u32 scoutfs_option_u32(struct super_block *sb, int token)
+{
+	switch(token) {
+		default: break;
+	}
+
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
 int scoutfs_parse_options(struct super_block *sb, char *options,
 			  struct mount_options *parsed)
 {
@@ -79,3 +90,41 @@ int scoutfs_parse_options(struct super_block *sb, char *options,
 
 	return 0;
 }
+
+int scoutfs_options_setup(struct super_block *sb)
+{
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct options_sb_info *osi;
+	int ret;
+
+	osi = kzalloc(sizeof(struct options_sb_info), GFP_KERNEL);
+	if (!osi)
+		return -ENOMEM;
+
+	sbi->options = osi;
+
+	osi->debugfs_dir = debugfs_create_dir("options", sbi->debug_root);
+	if (!osi->debugfs_dir) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = 0;
+out:
+	if (ret)
+		scoutfs_options_destroy(sb);
+	return ret;
+}
+
+void scoutfs_options_destroy(struct super_block *sb)
+{
+	struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
+	struct options_sb_info *osi = sbi->options;
+
+	if (osi) {
+		if (osi->debugfs_dir)
+			debugfs_remove_recursive(osi->debugfs_dir);
+		kfree(osi);
+		sbi->options = NULL;
+	}
+}

kmod/src/options.h

@@ -4,6 +4,12 @@
 #include <linux/fs.h>
 #include "format.h"
 
+enum {
+	Opt_listen = 0,
+	Opt_cluster,
+	Opt_err,
+};
+
 #define MAX_CLUSTER_NAME_LEN 17
 struct mount_options
 {
@@ -13,5 +19,10 @@ struct mount_options
 
 int scoutfs_parse_options(struct super_block *sb, char *options,
 			  struct mount_options *parsed);
+int scoutfs_options_setup(struct super_block *sb);
+void scoutfs_options_destroy(struct super_block *sb);
+
+u32 scoutfs_option_u32(struct super_block *sb, int token);
+#define scoutfs_option_bool scoutfs_option_u32
 
 #endif	/* _SCOUTFS_OPTIONS_H_ */

kmod/src/super.c

@@ -137,6 +137,7 @@ static void scoutfs_put_super(struct super_block *sb)
 	scoutfs_lock_destroy(sb);
 
 	scoutfs_destroy_triggers(sb);
+	scoutfs_options_destroy(sb);
 	debugfs_remove(sbi->debug_root);
 	scoutfs_destroy_counters(sb);
 	scoutfs_destroy_sysfs(sb);
@@ -331,6 +332,7 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
 	      scoutfs_setup_counters(sb) ?:
 	      scoutfs_read_supers(sb, &SCOUTFS_SB(sb)->super) ?:
 	      scoutfs_debugfs_setup(sb) ?:
+	      scoutfs_options_setup(sb) ?:
 	      scoutfs_setup_triggers(sb) ?:
 	      scoutfs_seg_setup(sb) ?:
 	      scoutfs_item_setup(sb) ?:

kmod/src/super.h

@@ -21,6 +21,7 @@ struct server_info;
 struct inode_sb_info;
 struct btree_info;
 struct sysfs_info;
+struct options_sb_info;
 
 struct scoutfs_sb_info {
 	struct super_block *sb;
@@ -64,6 +65,7 @@ struct scoutfs_sb_info {
 	struct scoutfs_triggers *triggers;
 
 	struct mount_options opts;
+	struct options_sb_info *options;
 
 	struct dentry *debug_root;