Re: NFS regression in 2.6

[Ulrich Drepper <drepper@redhat.com>]

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Trond Myklebust wrote:

> In short the scenario should be that
> 
>   - mkstemp() does an open(O_EXCL) -> nfs_lookup() creates hashed
>     negative dentry -> nfs_create() then does an O_EXCL call to the
>     server and instantiates the dentry.
> 
>   - unlink() walks the pathname -> finds the existing dentry using
>     cached_lookup() and only calls down to nfs_lookup_revalidate().

Sounds reasonable especially since the dup() call in my original example
isn't necessary.  So, the shortened test case is this:

#include <errno.h>
#include <error.h>
#include <stdlib.h>
#include <unistd.h>
int
main (void)
{
  char tmp[] = "estale-test.XXXXXX";
  int fd = mkstemp (tmp);
  if (fd == -1)
    error (EXIT_FAILURE, errno, "mkstemp failed");
  if (unlink (tmp) != 0)
    error (EXIT_FAILURE, errno, "unlink '%s' failed", tmp);
  if (ftruncate (fd, 0) != 0)
    error (EXIT_FAILURE, errno, "ftruncate failed");
  return 0;
}

- -- 
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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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