1 files changed, 15 insertions, 6 deletions

diff --git a/fs/filesystems.c b/fs/filesystems.c
index 7a4f61aa05f8..f37f87262837 100644
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -41,11 +41,12 @@ void put_filesystem(struct file_system_type *fs)
         module_put(fs->owner);
 }
 
-static struct file_system_type **find_filesystem(const char *name)
+static struct file_system_type **find_filesystem(const char *name, unsigned len)
 {
         struct file_system_type **p;
         for (p=&file_systems; *p; p=&(*p)->next)
-                if (strcmp((*p)->name,name) == 0)
+                if (strlen((*p)->name) == len &&
+                    strncmp((*p)->name, name, len) == 0)
                         break;
         return p;
 }
@@ -68,11 +69,12 @@ int register_filesystem(struct file_system_type * fs)
         int res = 0;
         struct file_system_type ** p;
 
+        BUG_ON(strchr(fs->name, '.'));
         if (fs->next)
                 return -EBUSY;
         INIT_LIST_HEAD(&fs->fs_supers);
         write_lock(&file_systems_lock);
-        p = find_filesystem(fs->name);
+        p = find_filesystem(fs->name, strlen(fs->name));
         if (*p)
                 res = -EBUSY;
         else
@@ -215,19 +217,26 @@ int get_filesystem_list(char * buf)
 struct file_system_type *get_fs_type(const char *name)
 {
         struct file_system_type *fs;
+        const char *dot = strchr(name, '.');
+        unsigned len = dot ? dot - name : strlen(name);
 
         read_lock(&file_systems_lock);
-        fs = *(find_filesystem(name));
+        fs = *(find_filesystem(name, len));
         if (fs && !try_module_get(fs->owner))
                 fs = NULL;
         read_unlock(&file_systems_lock);
-        if (!fs && (request_module("%s", name) == 0)) {
+        if (!fs && (request_module("%.*s", len, name) == 0)) {
                 read_lock(&file_systems_lock);
-                fs = *(find_filesystem(name));
+                fs = *(find_filesystem(name, len));
                 if (fs && !try_module_get(fs->owner))
                         fs = NULL;
                 read_unlock(&file_systems_lock);
         }
+
+        if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) {
+                put_filesystem(fs);
+                fs = NULL;
+        }
         return fs;
 }