[PATCH 0/2] HFS+ journal improvement - take 5

[Warren Turkal <wt@penguintechs.org>]

This is a patchset to change the way that the HFS+ filesystem detects
whether a volume has a journal or not.

The code currently mounts an HFS+ volume read-only by default when a
journal is detected. One can force a read/write mount by giving the
"force" mount option. The current code has this behavior since there is
no support for the HFS+ journal.

My problem is that the detection of the journal could be better. The
current code tests the attribute bit in the volume header that
indicates there is a journal. If that bit is set, the code assumes
that there is a journal.

Unfortunately, this is not enough to really determine if there is a
journal or not. When that bit is set, one must also examine the journal
info block field of the volume header. If this field is 0, there is no
journal, and the volume can be mounted read/write.

Thanks,
wt

Warren Turkal (2):
  Identify journal info block in volume header.
  Fix journal detection on HFS+.

 fs/hfsplus/hfsplus_raw.h |    2 +-
 fs/hfsplus/super.c       |   13 ++++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)