Thanks for the help Frank and Daniel. I figured it is much easy to enable
"mount_path_pseudo" and use pseudo path instead of using symlinks. No code
changes required. The sole purpose was to hide the original path because it
is long or cryptic.
Thanks,
Sriram
On Fri, Nov 10, 2017 at 6:58 PM, Daniel Gryniewicz <d...@redhat.com> wrote:
> You can do this with a stackable FSAL, since it's on top, not underneath,
> so it can override anything you want. You can even just put the symlink
> part in your FSAL, and defer everything else so VFS, if you want.
>
> Daniel
>
> On 11/08/2017 03:04 PM, Frank Filz wrote:
>
>> Yea, in the case of wanting to allow symlink exports, you would need to
>> replace the method. I’d be interested in why you want to allow them. That
>> is something that actually could be handled by a config or compile option.
>>
>> Frank
>>
>> *From:*sriram patil [mailto:spsrirampa...@gmail.com]
>> *Sent:* Wednesday, November 8, 2017 10:20 AM
>> *To:* Frank Filz <ffilz...@mindspring.com>
>> *Cc:* d...@redhat.com; nfs-ganesha-devel@lists.sourceforge.net
>> *Subject:* Re: [Nfs-ganesha-devel] Subfsal export
>>
>> Hi,
>>
>> In case of stackable FSALs, what if I want the underlying FSAL behave
>> differently. For example, VFS does not allow symlink exports, lookup_path
>> fails if we try to export symlink pointing to a directory. There can be
>> such cases where I want to defer (very small changes) from the underlying
>> "sub fsal". For bypassing some part of the underlying fsal function, is
>> rewriting the function the only way?
>>
>> Thanks,
>>
>> Sriram
>>
>> On Wed, Nov 8, 2017 at 11:22 PM, sriram patil <spsrirampa...@gmail.com
>> <mailto:spsrirampa...@gmail.com>> wrote:
>>
>> Hmm stackable FSAL sounds like a good option. Let me investigate on
>> that. I was mainly going with sub fsal because of xfs.
>>
>> I agree with both of you about pushing FSAL changes to upstream. Let
>> me see if I can make that happen.
>>
>> Thanks,
>>
>> Sriram
>>
>> On 08-Nov-2017 11:03 PM, "Frank Filz" <ffilz...@mindspring.com
>> <mailto:ffilz...@mindspring.com>> wrote:
>>
>> > You might want to consider a stackable FSAL instead.
>> FSAL_NULL is a good
>> > example to start from. It's much more flexible than
>> sub_fsals for VFS.
>> If I
>> > was implementing PanFS now, I'd use a stackable FSAL instead.
>>
>> Yea, this is a good point. Probably even the XFS/VFS split
>> should be done
>> with stackable FSAL.
>>
>> > Ganesha is LGPL specifically to allow non-FOSS FSALs.
>> However, if the
>> FSAL
>> > itself does not require proprietary code, there are many
>> advantages to
>> open
>> > sourcing it and getting it upstream. Not the least is that
>> changes to
>> APIs and
>> > the build system will be fixed by the community, so there
>> will be fewer
>> cases
>> > of sudden breakage for you to fix.
>>
>> On top of direct API impacts, it also helps to understand how
>> other FSALs
>> are using Ganesha so that not only do we not break the API, but
>> don't break
>> other assumptions that were made. It also is a better platform for
>> requesting FSAL specific API accommodation (for a recent
>> example, see
>> compute_readdir_cookie and whence_is_name support that was added
>> for
>> FSAL_RGW, though added in a generic way so other FSALs might use
>> it).
>>
>> Frank
>>
>> > Daniel
>> >
>> > On 11/08/2017 10:51 AM, sriram patil wrote:
>> > > Yes, I am making a new sub fsal. May not push it to
>> upstream because
>> > > it will not be useful without the whole framework/product.
>> As part of
>> > > that, I wanted to allocate an export object which has some
>> extra
>> > > fields, other than the ones in vfs_fsal_export.
>> > >
>> > > Also, I hope creating a sub fsal and not making the
>> implementation
>> > > opensource does not violate any license terms.
>> > >
>> > > Thanks,
>> > > Sriram
>> > >
>> > > On 08-Nov-2017 8:19 PM, "Daniel Gryniewicz"
>> <d...@redhat.com <mailto:d...@redhat.com>
>> > > <mailto:d...@redhat.com <mailto:d...@redhat.com>>> wrote:
>> > >
>> > > On 11/08/2017 02:41 AM, sriram patil wrote:
>> > >
>> > > Hi,
>> > >
>> > > In the subfsal framework, I see that subfsals can
>> have their own
>> > > fsal_obj_handles by implementing
>> vfs_sub_alloc_handle and then
>> > > use subfsal specific variables using container_of.
>> > >
>> > > It does not provide same functionality for
>> fsal_export however.
>> > > There is no vfs_sub_alloc_export.
>> vfs_create_export just calls
>> > > gsh_calloc to allocate vfs_fsal_export, giving no
>> flexibility.
>> > >
>> > > PANFS has its own struct panfs_fsal_export but it
>> is not
>> > > allocated anywhere. It still uses container_of on
>> > > vfs_fsal_export. This looks like a memory
>> corruption. The last
>> > > commit in PANFS however is about a year back, not
>> sure if it is
>> > > actively developed.
>> > >
>> > >
>> > > PANFS is unused and unmaintained. We keep it building,
>> but that's
>> it.
>> > >
>> > > Considering the above scenario, it makes sense to
>> have
>> > > vfs_sub_alloc_export to allow allocating the
>> wrapper export
>> > > object. Any thoughts?
>> > >
>> > >
>> > > This seems like it was a bug in the original
>> implementation for
>> > > PanFS. It probably should be fixed, but the VFS
>> sub_fsal doesn't
>> > > need it, so it works for now.
>> > >
>> > > Are you making a new sub_fsal?
>> > >
>> > > Daniel
>> > >
>> > >
>> ------------------------------------------------------------
>> ----------------
>> --
>> > > Check out the vibrant tech community on one of the
>> world's most
>> > > engaging tech sites, Slashdot.org!
>> http://sdm.link/slashdot
>> > > _______________________________________________
>> > > Nfs-ganesha-devel mailing list
>> > > Nfs-ganesha-devel@lists.sourceforge.net
>> <mailto:Nfs-ganesha-devel@lists.sourceforge.net>
>> > > <mailto:Nfs-ganesha-devel@lists.sourceforge.net
>> <mailto:Nfs-ganesha-devel@lists.sourceforge.net>>
>> > > https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-dev
>> el
>> > > <https://lists.sourceforge.ne
>> t/lists/listinfo/nfs-ganesha-devel>
>> > >
>> >
>> >
>> >
>> ------------------------------------------------------------
>> ----------------
>> --
>> > Check out the vibrant tech community on one of the world's
>> most engaging
>> > tech sites, Slashdot.org! http://sdm.link/slashdot
>> > _______________________________________________
>> > Nfs-ganesha-devel mailing list
>> > Nfs-ganesha-devel@lists.sourceforge.net
>> <mailto:Nfs-ganesha-devel@lists.sourceforge.net>
>> > https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
>>
>>
>> ---
>> This email has been checked for viruses by Avast antivirus
>> software.
>> https://www.avast.com/antivirus
>>
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source
>> =link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon>
>> Virus-free. www.avast.com <https://www.avast.com/sig-ema
>> il?utm_medium=email&utm_source=link&utm_campaign=sig-email&
>> utm_content=emailclient&utm_term=link>
>>
>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>
>
>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Nfs-ganesha-devel mailing list
Nfs-ganesha-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
