[Bug 253428] getdirentries does not work correctly on NFS mounts

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253428

--- Comment #6 from Rick Macklem <rmacklem at FreeBSD.org> ---
Just fyi, what I am looking at for the case
where the directory offset cookie returned
by the server is monotonically increasing is...

Replacing uses ig gbincore() with a similar
call the uses PCTRIE_LOOKUP_LE() instead
of PCTRIE_LOOKUP(). This would allow the
directory offset cookies to be used as keys
for the block instead of the "logical byte
offset" of the converted to UFS-like directory
blocks.

The problem is that there is no way to know
if the directory offset cookies are monotonically
increasing until you see them.
(Linux does something where the client code
 checks for a non-monotonically increasing
 offset then disables the caching optimization
 if this happens. I am not yet sure if doing this
 will be practical for what I am starting
 to code.)

I am planning on proposing a new attribute for
NFSv4.2 to indicate whether or not the offsets
are monotonically increasing, but that will
take a long time to get adopted.

Once keyed on directory offset cookies, I
think the "short block caching issue might
get fixed, since I think it was related to the
"logical byte offset" of the next block
changing when short directory blocks were
returned.
(Maybe this should be moved to a mailing list?)

-- 
You are receiving this mail because:
You are the assignee for the bug.