Dave Chinner wrote:
> Like:
>
> # xfs_freeze -f <mntpt>
> # xfs_bmap -vvp <file>
> # <do something nasty with direct block access>
> # xfs_freeze -u <mntpt>
^^^ Oh, exactly the sort of thing which led to this quote from Andreas
Dilger on why FIEMAP is *not* suitable for this, on generic filesystems :-)
"EEEEEK [...] Directly writing underneath a filesystem is major
bad news and will likely corrupt the filesystem because [page
cache reasons]."
Besides, if you're using the currently-XFS-specific freeze capability,
a simple fsync() before the xfs_bmap, inside the freeze, will be
sufficient won't it?
-- Jamie
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