[patch 0/6][RFC] Cleanup FIBMAP

The following series is meant to clean up FIBMAP paths with the eventual goal of allowing users to be able to FIBMAP their data.

I'm sending this as an RFC as I've only tested this on a x86_64 kernel with a 32bit binary on ext2 and I've noticed a couple ext2_warnings already.

I'm unsure of the locking in [4/6] fix_race_with_truncate.patch.  Any help here would greatly be appreciated.

The last patch, [6/6] drop_cap_sys_rawio_for_fibmap.patch, is of course, not to be applied until any remaining issues are fixed :)

Thanks,

Mike Waychison
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Follow-Ups:
- Re: [patch 0/6][RFC] Cleanup FIBMAP
  - From: "H. Peter Anvin" <[email protected]>
- Re: [patch 0/6][RFC] Cleanup FIBMAP
  - From: Anton Altaparmakov <[email protected]>
- [patch 2/6][RFC] Allow FIBMAP to return EFBIG on large filesystems.
  - From: Mike Waychison <[email protected]>
- [patch 5/6][RFC] Introduce FIBMAP64
  - From: Mike Waychison <[email protected]>
- [patch 4/6][RFC] Attempt to plug race with truncate
  - From: Mike Waychison <[email protected]>
- [patch 6/6][RFC] Drop CAP_SYS_RAWIO requirement on FIBMAP
  - From: Mike Waychison <[email protected]>
- [patch 3/6][RFC] Move FIBMAP logic
  - From: Mike Waychison <[email protected]>
- [patch 1/6][RFC] Keep FIBMAP from looking at negative block nrs
  - From: Mike Waychison <[email protected]>

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