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-rw-r--r--fs/super.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index 95adbb3d8e58..2c3e370c60d9 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -392,6 +392,36 @@ void sync_supers(void)
}
/**
+ * iterate_supers - call function for all active superblocks
+ * @f: function to call
+ * @arg: argument to pass to it
+ *
+ * Scans the superblock list and calls given function, passing it
+ * locked superblock and given argument.
+ */
+void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
+{
+ struct super_block *sb, *n;
+
+ spin_lock(&sb_lock);
+ list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
+ if (list_empty(&sb->s_instances))
+ continue;
+ sb->s_count++;
+ spin_unlock(&sb_lock);
+
+ down_read(&sb->s_umount);
+ if (sb->s_root)
+ f(sb, arg);
+ up_read(&sb->s_umount);
+
+ spin_lock(&sb_lock);
+ __put_super(sb);
+ }
+ spin_unlock(&sb_lock);
+}
+
+/**
* get_super - get the superblock of a device
* @bdev: device to get the superblock for
*