add options.c

lustre/snapfs/Makefile.am

@@ -13,7 +13,7 @@ EXTRA_PROGRAMS = snapfs
 
 snapfs_SOURCES = cache.c  clonefs.c  dcache.c  dir.c  dotsnap.c  file.c 
 snapfs_SOURCES += filter.c  inode.c  journal_ext3.c  psdev.c 
-snapfs_SOURCES += snap.c  snaptable.c  super.c  symlink.c  sysctl.c
+snapfs_SOURCES += snap.c  snaptable.c  super.c  symlink.c  sysctl.c options.c
 
 
 include $(top_srcdir)/Rules

lustre/snapfs/options.c

+/*
+ *  snapfs/options.c
+ */
+#define DEBUG_SUBSYSTEM S_SNAP
+
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/snap.h>
+#include <linux/errno.h>
+#include "snapfs_internal.h" 
+
+
+static struct list_head option_list;
+char  *options = NULL;
+char  *opt_left = NULL;
+
+int init_option(char *data)
+{
+	INIT_LIST_HEAD(&option_list);
+	SNAP_ALLOC(options, strlen(data) + 1);
+	if (!options) {
+		CERROR("Can not allocate memory \n");
+		return -ENOMEM;
+	}
+	memcpy(options, data, strlen(data));
+	opt_left = options;
+	return 0;
+}
+/*cleanup options*/
+void cleanup_option()
+{
+	struct option *option;
+	while (!list_empty(&option_list)) {
+		option = list_entry(option_list.next, struct option, list);
+		list_del(&option->list);
+		SNAP_FREE(option->opt, strlen(option->opt) + 1);
+		SNAP_FREE(option->value, strlen(option->value) + 1);
+		SNAP_FREE(option, sizeof(struct option));
+	}
+	SNAP_FREE(options, strlen(options) + 1);
+}
+int get_opt(struct option **option, char **pos)
+{
+	char  *name, *value, *left;
+	struct option *tmp_opt;
+	int  length;
+
+	*pos = opt_left;
+
+	if (! *opt_left)
+		return -ENODATA;
+
+	left = strchr(opt_left, '=');
+
+	if (left == opt_left || !left) 
+		return -EINVAL;
+
+	SNAP_ALLOC(tmp_opt, sizeof(struct option));   	
+		
+	length = left - opt_left + 1;
+	SNAP_ALLOC(name, length);
+	tmp_opt->opt = name;
+	memset(name, 0, length);
+	while (opt_left != left) *name++ = *opt_left++;
+
+	opt_left ++; /*after '='*/
+
+	left = strchr(opt_left, ',');
+	if (left == opt_left) {
+		SNAP_FREE(tmp_opt->opt, length);
+		SNAP_FREE(tmp_opt, sizeof(struct option));
+		opt_left = *pos;
+		return -EINVAL;
+	}
+	if (!left) 
+		left = opt_left + strlen(opt_left); 
+	length = left - opt_left + 1;
+	SNAP_ALLOC(value, length);
+	tmp_opt->value = value;
+	memset(value, 0, length);
+	while (opt_left != left) *value++ = *opt_left++;
+
+	list_add(&tmp_opt->list, &option_list);
+	
+	if (*opt_left == ',') opt_left ++; /*after ','*/	
+
+	*option = tmp_opt;
+	return 0;
+}