generating uevents by xfs

[Krzysztof Błaszkowski]

Hello,

once upon i was asked to think about such facility for notifying userspace 
when some mount point is nearly full at some level let's say e.g. 90% 
(threshold should be configurable).

here is a solution designed by me and i would like to see comments on this 
idea and solution.

i verified these patches with 2.6.27.19 (SuSE) but there are also patches for 
2.6.28.4 and 2.6.29.2 but i haven't given a try to latest two kernels.

to use it one may need to pick right *-1- patch and the *-2 patch.


Krzysztof Blaszkowski
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