EXT4 Has Many Bug Fixes For Linux 4.7

Ted Ts'o has sent in his pull request of EXT4 file-system updates targeting the Linux 4.7 kernel merge window.

For Linux 4.7 the EXT4 updates aren't particularly exciting but come down to mostly bug fixes. Ted explained:

Fix a number of bugs, most notably a potential stale data exposure after a crash and a potential BUG_ON crash if a file has the data journalling flag enabled while it has dirty delayed allocation blocks that haven't been written yet. Also fix a potential crash in the new project quota code and a maliciously corrupted file system.

In addition, fix some DAX-specific bugs, including when there is a transient ENOSPC situation and races between writes via direct I/O and an mmap'ed segment that could lead to lost I/O.

Finally the usual set of miscellaneous cleanups.

More details via the pull request.