On Wed, Dec 14, 2016 at 06:54:27PM +0800, jin deng wrote: > > > > > > > Te NFSv3 protocol does not have a OPEN procedure. When an NFSv3 client > > wants to read/write a file, the operations are like: > > > > 1. LOOKUP of the filename, returns a filehandle on success > > 2. WRITE data with offset in the filehandle > > > > A LOOKUP is like stat(), and the filehandle is a opaque structure that > > uniquely identifies the file on the storage backend. A filehandle > > basically identifies the filesystem/volume and the inode of the file so > > that Gluster/NFS can find it again. For Gluster/NFS the filehandle > > consists out of the Volume-ID and the GFID of the file. > > > > Our GlusterFS protocol (for the I/O on the bricks) have support for > > procedures that accept a GFID (like a Gluster Volume wide inode). The > > Gluster/NFS server uses these procedures exclusively, except for LOOKUP. > > > > Thanks for your explain,Niels.I know the operations which you > mentioned.While my confusion is > > that why the xlators such as "debug/io-stats" defines a "open" procedure if > the NFSv3 protocol doesn't > > require it.And when will these procedures be called? I haven't found any > caller in the code of "server/nfs". Any > > other top xlator will call that? I do not expect that any of the xlators will call OPEN. From my understanding of what you wrote, I assume that debug/io-stats is not very functional when using Gluster/NFS. You also seem to have conformed in your original email that the statistics are not complete. Reporting that as a bug against the io-stat xlator is the first step. If you are able to write a patch to create the inode-context when it it missing, then you can send it to our Gerrit instance for review: http://gluster.readthedocs.io/en/latest/Developer-guide/Simplified-Development-Workflow/ Thanks, Niels
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