Don's changes to fsck on 4.x ...

[Don Lewis]

On  6 Nov, Marc G. Fournier wrote:
> 
> Well, finally had a reason to use it, and its running right now ... seems 
> a bit slower in phase 2 then before ... is to be expected?  Looking 
> through the patch, it seems that all pass's were affected, so this might 
> be now the norm ... after ~39minutes running on a very large file system, 
> hitting ctl-T periodically, I'm up to about 50% through Phase 2 ... so far 
> *knock on wood* no errors being generated by fsck itself, but that doesn't 
> mean anything :)

Under normal circumstances, there shouldn't be any noticeable difference
in performance.  If there are a lot of zero link count files, phase 1
should be very slightly faster because the zero link count file list no
longer needs to be allocated, and phase 4 should be a lot faster. Most
of the time in phases 1 and 2 is consumed by disk reads.  The only
change to phase 2 was the addition of the new inode states to a couple
of case statements and an if statement which should not affect the
amount of I/O done and CPU time would only be affected by a miniscule
amount, so I would not expect any change to the performance of that
phase.