Hi Aurélien,
I can provide you an alternate solution, still nfs-ganesha based. For
the need of a project, I developed an open-source library that emulate a
POSIX namespace using a KVS (for metadata) and an object store (for
data). For example, you can use REDIS and RADOS. I have written a FSAL
for it (it is not pushed in the official branch) but with no compliancy
to support_ex, it's still using the former FSAL semantics (so it should
be ported to support_ex). If you are interested, I can give you some
pointers (the code is on github). You could use S3 as data storage for
example. In particular, I had to solve the same "inode" issue that you
met. This solution as very few impact on nfs-ganesha code (it just adds
a new FSAL).
Regards
Philippe
On 01/03/18 19:58, Aurelien RAINONE wrote:
To follow up on the development on an FSAL for S3, I have some doubts
and questions I'd like to share.
Apart from its full path, S3 doesn't have the concept of file
descriptor, I mean, there's nothing else
than the full path that
IcanprovidetoS3inordertogetattributeofcontentofaspecificobject.
I have some doubts regarding the implementation of the S3 fsal object
handle (s3_fsal_obj_handle).
Should s3_fsal_obj_handle be very simple, for example should it only
contain a key that maps to the full S3 filename, in an key-value store.
Or on the contrary, should the handle implement a tree like structure,
like I saw in FSAL_MEM?
Or something in between, but what?
Having a very simple handle has some advantages but may require some
more frequent network calls,
for example readdir won't have any kind of information about the
content of the directory.
Having a whole tree-like structure in the handle would allow to have
direct access to directory content,
but isn't that the role of ganesha cache to do that?
My questions probably shows that I have problems to understand the
responsability of my FSAL implementation
regarding the cache. Who does what, what doesn't do what?
Good evening,
Aurélien
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