Re: [fuse-devel] [PATCH] vfs: fix propagation of atomic_open create error on negative dentry

["Jean-Pierre André" <jean-pierre.andre@wanadoo.fr>]

Hi,

Miklos Szeredi wrote:
> Sage Weil<sage@inktank.com>  writes:
>
>
>> Hi Miklos,
>>
>> I found some time to track down the O_CREAT error code issue.  Patch is
>> below.  Does this look correct?
>>
>> I was reproducing with
>>
>>   ceph-fuse mnt
>>   mkdir -p mnt/a
>>   cd mnt
>>   .../pjd-fstest-20080816/fstest -u 65534 -g 65534 open a/foo O_RDONLY,O_CREAT 0644
>>
>> EACCES is expected, ENOENT was returned instead.
>>
> I don't quite undersdand what is happending here.
>
> Why does ceph-fuse return ENOENT here?  Returning ENOENT for O_CREAT
> only makes sense if the parent directory doesn't exist, but that's not
> the case here.
>

In this test, the parent directory exists, but it is not
writable by the process which tries to create the file.

According to opengroup, from
http://pubs.opengroup.org/onlinepubs/000095399/functions/open.html


    The /open/() function shall fail if:

    [EACCES]
        Search permission is denied on a component of the path prefix,
        or the file exists and the permissions specified by /oflag/ are
        denied, or *the file does not exist and write permission is
        denied for the parent directory of the file to be created*, or
        O_TRUNC is specified and write permission is denied.


Regards

Jean-Pierre