xfs: fixes for 3.10-rc4

- Fix nested transactions in xfs_qm_scall_setqlim
- Clear suid/sgid bits when we truncate with size update
- Fix recovery for split buffers
- Fix block count on remote symlinks
- Add fsgeom flag for v5 superblock support
- Disable XFS_IOC_SWAPEXT for CRC enabled filesystems
- Fix dirv3 freespace block corruption
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