Given that filesystem designers seem to love nit-picking tiny details,
and I am personally starting to lose patience, if the fiemap patches
stalls any further, my plan is to take a page from the XFS playbook and
simply take the ext4-fiemap patch and implement an ext4-specific ioctl.
If and when the linux-fsdevel community manages come to consensus on the
fiemap patches, whether it happens in 2.6.28 or Linux 2.6.87, it will be
easy enough to wire the ext4 support to the generic fiemap ioctl.
-- Ted Ts'o
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