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The maximum number of qtrees is 254 (per volume I think).

Yes -- that's exactly right. It's 254 (off-by-one error on my part), and it's per volume.

This value is the natural result of using a 16-bit q-tree ID in each inode.

Don't count your bits before they're hatched, Dave. :-)

Presumably you meant "8-bit q-tree ID in each inode":

uchar       tid;            /* Tree id (for tree quotas). */

I was just taunting Val...

Dave

Unfortunately, most of the audience probably won't get that. To save Val further humiliation, I won't explain it.... :-)

Guy - I am eternally (I think that's about 4 billion years and change...) grateful for your discretion <g>...

-Val.