Can an NFS server legitimately duplicate directory entry cookies?
Chris Siebenmann (cks@hawkwind.utcs.toronto.edu)
Mon, 21 Sep 1998 19:40:54 -0500
It appears that a SGI NFS server (Irix 6.2) can sometimes return the
same directory cookie for two successive entries in the directory
(if I am tracing the code right, the cookie is stuffed in the dirent
structure's d_off member by the kernel's getdents(); otherwise, my test
program is printing something else). This appears to sometimes cause the
getdents() syscall to enter a state where it always returns the same entry.
Is this legitimate behavior of the SGI NFS server implementation, and
thus a problem with the Linux NFS client nfs_readdir(), or is this an
SGI bug that I should club them about?
I suspect that this is a SGI bug, as the entire NFS directory cache
code in linux/fs/nfs/dir.c appears to rely on the cookie being unique.
- cks
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