High Sierra du ifree / inodes query

Hi,

My High Sierra MBP froze a couple of days ago so I turned it off and on again to get it going. After that it was very slow and exhibited strange behaviour (apps not starting, conflicting free space values, warning about low disk space but showing 20gb free in Finder?). I used "rm" to remove some large files (which took a very long time) and did lots of reboots and slowly things returned to normal. However since then I have a very large "ifree" value when using "du" on the Terminal :

$ df -k

Filesystem 1024-blocks Used Available Capacity iused ifree %iused Mounted on

/dev/disk1s1 976900220 773105708 200977204 80% 3359526 9223372036851416281 0% /

devfs 337 337 0 100% 1169 0 100% /dev

/dev/disk1s4 976900220 2097192 200977204 2% 2 9223372036854775805 0% /private/var/vm

map -hosts 0 0 0 100% 0 0 100% /net

map auto_home 0 0 0 100% 0 0 100% /home

The laptop appears to be behaving normally now and a Disk Utility repair finds no problems (originally I was having fsroot tree errors) however I was concerned this may be a ticking time bomb and should wipe and rebuild? Has anyone any thoughts on this?

Thanks,

Steve H