bcache: Move couple of functions to sysfs.c

[mirror_ubuntu-bionic-kernel.git] / drivers / md / bcache / sysfs.c

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index f4150eba2101a472bfc44cf9212ff0dbe5d056e0..5507b21fadbd13f4f967e1dc07550e6c06ef6d79 100644 (file)
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -132,6 +132,41 @@ rw_attribute(btree_shrinker_disabled);
 rw_attribute(copy_gc_enabled);
 rw_attribute(size);
 
+static ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[],
+                           size_t selected)
+{
+       char *out = buf;
+       size_t i;
+
+       for (i = 0; list[i]; i++)
+               out += snprintf(out, buf + size - out,
+                               i == selected ? "[%s] " : "%s ", list[i]);
+
+       out[-1] = '\n';
+       return out - buf;
+}
+
+static ssize_t bch_read_string_list(const char *buf, const char * const list[])
+{
+       size_t i;
+       char *s, *d = kstrndup(buf, PAGE_SIZE - 1, GFP_KERNEL);
+       if (!d)
+               return -ENOMEM;
+
+       s = strim(d);
+
+       for (i = 0; list[i]; i++)
+               if (!strcmp(list[i], s))
+                       break;
+
+       kfree(d);
+
+       if (!list[i])
+               return -EINVAL;
+
+       return i;
+}
+
 SHOW(__bch_cached_dev)
 {
        struct cached_dev *dc = container_of(kobj, struct cached_dev,