Re: cvs commit: src/sys/kern vfs_syscalls.c

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

On 16.08.2005, at 22:37, Joerg Sonnenberger wrote:
> >     They also can't be refering to hardlinks, or the standard would 
> > say
> >     hardlinks.
> The standard *never* says hardlinks either. It is always talking about
> directory entries or links.

Yes that's true.  It talks either about symbolic links or links 
(meaning hard links i guess).  Yet I don't see why resolve should one 
time mean pathname->inode and the other time 
path-with-symlinks-or-relative->pathname

> >     They have to be refering to the paths resolving to the same
> >     identical namespace, in which case we are right, linux is right,
> >     and FreeBSD is wrong.
> "Resolving to the same existing file" leaves the pure namespace, 
> because
> the standard differenciates between files (UFS: inode) and directory
> entries.

Wrong interpretation in my eyes.

> >     It's simple and straightfoward, not ultra complex.  It is not
> >     rename's responsibility to validate or resolve symlinks, or to
> >     treat hardlinks as a special case.  rename is entirely a namespace
> >     operation.  The only requirements are that it disallow impossible
> >     combinations, such as trying to rename a file over a directory,
> >     or rename a directory into a sub-directory of itself.
> As soon as the "new" operand already exists it is not a pure namespace
> operation anymore. What happens if two NFS clients have the directory
> cached, the first issues "mv a b", the second "mv b a"? Are both 
> clients
> issuing remove operations with the new code?

Do the clients issue remove operations?  I was thinking they just send 
"rename a to b" the server, which in turn does the job.

NFS is not a good example anyways because it operates with 
maybe-outdated data.

cheers
  simon

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