[PULL-REQUEST] md: avoid bogus read error on large-PAGE_SIZE machines

[PULL-REQUEST] md: avoid bogus read error on large-PAGE_SIZE machines

[Neil Brown]

Hoping this isn't too late for 2.6.28.

This fixes a bug that makes it impossible to start md arrays with
write-intent-bitmaps on machines with 64K PAGE_SIZE.
We read whole pages and as easily fall off the end of the device.

It is a bug that has been around for a long time and is suitable for
any currently maintained -stable.  As such it has a 
Cc: stable@kernel.org
line.

Thanks,
NeilBrown



The following changes since commit 55dac3a5553b13891f0ae4bbd11920619b5436d4:
  Linus Torvalds (1):
        Merge branch 'i2c-fixes' of git://aeryn.fluff.org.uk/bjdooks/linux

are available in the git repository at:

  git://neil.brown.name/md/ for-linus

NeilBrown (1):
      md: Don't read past end of bitmap when reading bitmap.

 drivers/md/bitmap.c |   22 +++++++++++++++++-----
 1 files changed, 17 insertions(+), 5 deletions(-)