Branch:HEAD

[fs/lustre-release.git] / lustre / snapfs / super.c

diff --git a/lustre/snapfs/super.c b/lustre/snapfs/super.c
index 587075b..bfeecde 100644 (file)
--- a/lustre/snapfs/super.c
+++ b/lustre/snapfs/super.c
@@ -44,6 +44,42 @@ static void put_filesystem(struct file_system_type *fs)
                __MOD_DEC_USE_COUNT(fs->owner);
 }
 
+static struct vfsmount* get_vfsmount(struct super_block *sb)
+{
+       struct vfsmount *rootmnt, *mnt, *ret = NULL;
+       struct list_head *end, *list;
+
+       rootmnt = mntget(current->fs->rootmnt);
+       end = list = &rootmnt->mnt_list;
+       do {
+               mnt = list_entry(list, struct vfsmount, mnt_list);
+               if (mnt->mnt_sb == sb) {
+                       ret = mnt;
+                       break;
+               }
+               list = list->next;
+       } while (end != list);
+       mntput(current->fs->rootmnt);
+       return ret;
+}
+
+void get_snap_current_mnt(struct super_block *sb)
+{
+       struct vfsmount *mnt;
+
+       mnt = get_vfsmount(sb);
+       if (mnt) 
+               mntget(mnt);
+}
+void put_snap_current_mnt(struct super_block *sb)
+{
+       struct vfsmount *mnt;
+
+       mnt = get_vfsmount(sb);
+       if (mnt) 
+               mntput(mnt);
+}
+
 /* In get_opt we get options in opt, value in opt_value
  * we must remember to free opt and opt_value*/
 static char * snapfs_options(char *options, char **cache_type, 
@@ -423,6 +459,8 @@ clone_read_super(
 
        CDEBUG(D_SUPER, "sb %lx, &sb->u.generic_sbp: %lx\n",
                 (ulong) sb, (ulong) &sb->u.generic_sbp);
+       
+       get_snap_current_mnt(snap_cache->cache_sb);
  out_err:
        cleanup_option();
        if (err)