[PATCH] make growfs check device size limits too

[Nathan Scott <nscott@xxxxxxxxxx>]

On the mount path we check for a superblock that describes a filesystem
to large for the running kernel to handle.  This catches the case of an
attempt to mount a >16TB filesystem on i386 (where we are limited by the
page->index size, for XFS metadata buffers in xfs_buf.c).

This patch makes similar checks on the growfs code paths for regular and
realtime growth, else we can end up with filesystem corruption, it would
seem (from #xfs chatter).  Untested patch follows; probably better to do
this as a macro, in a header, and call that in each place...?

cheers.

-- 
Nathan

growfs.patch
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