and vmtruncate, and the reorder the vmtruncate + foofs_vmtruncate sequence to
be in order of zeroing blocks using block_truncate_page or similar helpers,
size update and on finally on-disk truncation which should not fail.
-inode_change_ok now includes the size checks for ATTR_SIZE and must be called
-in the beginning of ->setattr unconditionally.
+setattr_prepare (which used to be inode_change_ok) now includes the size checks
+for ATTR_SIZE and must be called in the beginning of ->setattr unconditionally.
[mandatory]
work just as well; if it's something more complicated, use dentry->d_parent.
Just be careful not to assume that fetching it more than once will yield
the same value - in RCU mode it could change under you.
+--
+[mandatory]
+ ->rename() has an added flags argument. Any flags not handled by the
+ filesystem should result in EINVAL being returned.