Re: BTRFS cache problem

[Hugo Mills <hugo@carfax.org.uk>]

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On Sat, Nov 10, 2012 at 11:14:46PM +0100, Swâmi Petaramesh wrote:
> Hi,
> 
> My BTRFS is mounted with space_cache,inode_cache , and I now get at boot
> time the following message :
> 
> “btrfs: free space inode generation (0) did not match free space cache
> generation (189086)”
> 
> Starting once with "clear_cache" doesn't seem to be able to fix the
> issue... Any clue ?

   You only need to mount with space_cache once, and after that it's
"sticky". What's probably happening is that you're mounting with
space_cache, which rebuilds the cache. Then, if you reboot before it's
finished rebuilding the cache, the cache isn't complete, and (I think)
it causes the above message -- which is harmless. The same applies to
the inode cache options.

   Try mounting with clear_cache *once*, then remounting with
space_cache,inode_cache *once*, and waiting for it to finish
rebuilding the cache. Finally, remove all mention of the caches from
your fstab and kernel command line before you next mount the FS.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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