NTFS: Fix read regression.
Anton Altaparmakov authored
The regression was caused by:
        commit[a32ea1e1

] Fix read/truncate race

This causes ntfs_readpage() to be called for a zero i_size inode, which
failed when the file was compressed and non-resident.

Thanks a lot to Mike Galbraith for reporting the issue and tracking down
the commit that caused the regression.

Looking into it I found three bugs which the patch fixes.
Signed-off-by: default avatarAnton Altaparmakov <aia21@cantab.net>
Tested-by: default avatarMike Galbraith <efault@gmx.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
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