On Tue, 2011-11-29 at 23:10 +0800, Peng Tao wrote: > On Tue, Nov 29, 2011 at 9:35 PM, Myklebust, Trond > <Trond.Myklebust@xxxxxxxxxx> wrote: > >> -----Original Message----- > >> From: tao.peng@xxxxxxx [mailto:tao.peng@xxxxxxx] > >> Sent: Tuesday, November 29, 2011 7:40 AM > >> To: skinsbursky@xxxxxxxxxxxxx > >> Cc: Myklebust, Trond; linux-nfs@xxxxxxxxxxxxxxx; xemul@xxxxxxxxxxxxx; > >> neilb@xxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > >> jbottomley@xxxxxxxxxxxxx; bfields@xxxxxxxxxxxx; davem@xxxxxxxxxxxxx; > >> devel@xxxxxxxxxx > >> Subject: RE: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference > >> from blocklayout routines > >> > >> > -----Original Message----- > >> > From: Stanislav Kinsbursky [mailto:skinsbursky@xxxxxxxxxxxxx] > >> > Sent: Tuesday, November 29, 2011 8:19 PM > >> > To: Peng, Tao > >> > Cc: Trond.Myklebust@xxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx; Pavel > >> > Emelianov; neilb@xxxxxxx; netdev@xxxxxxxxxxxxxxx; > >> > linux-kernel@xxxxxxxxxxxxxxx; James Bottomley; bfields@xxxxxxxxxxxx; > >> > davem@xxxxxxxxxxxxx; devel@xxxxxxxxxx > >> > Subject: Re: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference > >> > from blocklayout routines > >> > > >> > 29.11.2011 16:00, tao.peng@xxxxxxx пишет: > >> > >> -----Original Message----- > >> > >> From: linux-nfs-owner@xxxxxxxxxxxxxxx > >> > >> [mailto:linux-nfs-owner@xxxxxxxxxxxxxxx] On Behalf Of > >> > Stanislav > >> > >> Kinsbursky > >> > >> Sent: Tuesday, November 29, 2011 6:11 PM > >> > >> To: Trond.Myklebust@xxxxxxxxxx > >> > >> Cc: linux-nfs@xxxxxxxxxxxxxxx; xemul@xxxxxxxxxxxxx; neilb@xxxxxxx; > >> > >> netdev@xxxxxxxxxxxxxxx; linux- kernel@xxxxxxxxxxxxxxx; > >> > >> jbottomley@xxxxxxxxxxxxx; bfields@xxxxxxxxxxxx; > >> > >> davem@xxxxxxxxxxxxx; devel@xxxxxxxxxx > >> > >> Subject: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference > >> > >> from blocklayout routines > >> > >> > >> > >> This is a cleanup patch. We don't need this reference anymore, > >> > >> because blocklayout pipes dentries now creates and destroys in > >> > >> per-net operations and on PipeFS mount/umount notification. > >> > >> Note that nfs4blocklayout_register_net() now returns 0 instead of > >> > >> -ENOENT in case of PipeFS superblock absence. This is ok, because > >> > >> blocklayout pipe dentry will be created on PipeFS mount event. > >> > > When is the "pipefs mount event" going to happen? When inserting > >> > > kernel modules or when user issues > >> > mount command? > >> > > > >> > > >> > When user issues mount command. > >> > Kernel mounts of PipeFS has been removed with all these patch sets > >> > I've sent already. > >> Then it is going to break blocklayout user space program blkmapd, which is > >> stared before mounting any file system and it tries to open the pipe file > >> when started. > > > > Why on earth is blkmapd doing this instead of listening for file creation notifications like the other rpc_pipefs daemons do? > Not sure how the original implementer chose this but I think it is > likely because we do not expect the pipe file to be created or deleted > dynamically. Unless blkmapd can pin the sunrpc module (which it shouldn't be able to) then that assumption would be wrong. Please look into fixing blkmapd... Trond -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@xxxxxxxxxx www.netapp.com -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
