nfs cannot overwrite group writable files after 2.6.15
- From: jrose@xxxxxxxxxxxxxxxxxxxxx
- Date: 6 Nov 2006 19:53:37 -0800
Hello people,
I have been running into this problem for a while now and it is
essentially preventing an upgrade from FC4 to FC5. This bug is also
known to exist in other distros and seems to be reproducable.
Client Distribution: Fedora Core 4
Server(s): Isilon cluster (modified FreeBSD), OS X Server (10.4.6)
Kernels tested:
2.6.15.1 --> 2.6.15.7 perform as expected
2.6.16.1 --> present group write operations fail with cannot open file
for writing
Test scenario
single nfs mounted folder /home
two users: testnfs1 (uid 0x0378) , testnfs2 (uid 0x0379)
Users are only in one primary group : users (gid 0x64)
testnfs1 own the folder /home/testnfs1
folder permissions are:
drwxrwxr-x 2 testnfs1 users 41 Nov 1 16:38 /home/testnfs1
testnfs1 creates a file in /home/testnfs1 called test file
permissions are:
-rw-rw-r-- 1 testnfs1 users 79 Nov 1 16:38 /home/testnfs1/testfile
testnfs2 edits the file and saves.
Results:
2.6.15 ---> file is overwritten as expected.
2.6.16.n ---> cannot open the file for writing.
Just to rule out the RPC 16 group limit I applied the > 16 group patch.
This had no effect on the results.
I have packet dumps of the two resulst but I cannot post them here.
Of course, /home mounted from a linux server always works as expected.
Does anyone have an idea as to what was changed with regards to nfs for
2.6.16? and even better how to fix this issue!
Thanks
James
.
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