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Subject[PATCH v2] direct-io: only inc/dec inode->i_dio_count for file systems

A proper patch series posting of the patch to skip inode dio counts
where we don't need them. Performance results and general notes in
patch #1. We can take this a bit further if we want to push this
truncate locking into the caller, but I'd like to keep that as a
separate patch series instead.

Changes since v2:

- Changed flag to DIO_SKIP_DIO_COUNT. Patch 2+3 will use this for
skipping the extra inc/dec for btrfs and ext4, so better rename it
to something that better tells what is happening in the deep mess
that is dio.

- Have inode_dio_inc/dec() helpers. Again, this better tells the caller
what is going on.

Jens Axboe

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