xfs_check and xfs_repair internal working details

["Fong Vang" <sudoyang@xxxxxxxxx>]

I would like to find how how xfs_check and xfs_repair do their work
internally.  I need to find answers to the following questions:

a) assuming the amount of data is the same for file systems, does it take
longer for xfs_check and xfs_repair to check/repair a file system with a lot
more files than one that has fewer?  Assuming two file systems are 1TB each
completely filled.  One of the file systems is filled with very large files
while the other one is filled with very small files, does it take longer to
check and repair the latter?

b) does xfs_check and repair check only the used blocks or does it check
everything?  I think there's a free list as well so I'm assuming it checks
that list as well.

If anyone can provide more insight into xfs_check and repair, it would be
greatly appreciated.

Thank you.


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