On Thu, Jan 22, 2015 at 12:09:46PM +0100, Christoph Hellwig wrote: > This series adds support for the pNFS operations in NFS v4.1, as well > as a block layout driver that can export block based filesystems that > implement a few additional export operations. Support for XFS is > provided in this series, but other filesystems could be added easily. > > The core pNFS code of course owns its heritage to the existing Linux > pNFS server prototype, but except for a few bits and pieces in the > XDR path nothing is left from it. > > The design of this new pNFS server is fairly different from the old > one - while the old one implemented very little semantics in nfsd > and left almost everything to filesystems my implementation implements > as much as possible in common nfsd code, then dispatches to a layout > driver that still is part of nfsd and only then calls into the > filesystem, thus keeping it free from intimate pNFS knowledge. > > This version of the code has been rebased to the locks-for-3.20 > tree which adds a new lock context structure to the inode. By the way, Jeff, do you consider the lock changes are ready? Would you mind if I pulled or cherry-picked them into the nfsd tree just to simplify merging this stuff for 3.20? (Assuming it's going to be ready.) --b. > For now > we still (ab)use the lease list like in the last version. Adding > a pNFS-specific list would duplicate a lot of code without much > benefit. But during this research I came up with way to associate > a nfs4_file with a struct file at open time which should allow > to greatly simplify the pNFS and delegation code. So stay tuned > for some patches in this area! > > For now this also doesn't take errata 3901 for rfc 5661 into account > yet and sticks to the verified errata. The changes in 3901 seem > useful in the longer run one verified and will be implemented > eventually. Note that the only existing pNFS block client (Linux) > would not benefit from the longer layout lifetimes anyway. > > More details are document in the individual patch descriptions and > code comments. > > This code is also available from: > > git://git.infradead.org/users/hch/pnfs.git pnfsd-for-3.20-2 > > Changes since V1: > - rebased to the locks-for-3.20 tree > - fixed a memory leak in the nfsd4_encode_getdeviceinfo error path > - removed the always one lg_roc field > - added a nopnfs export option > - use a synchronous transaction in layoutget to simplify recovery > - various XFS fixes pointed out by Dave > - various documentation typo fixes -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
