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2009-03-28SUNRPC: Set IPV6ONLY flag on PF_INET6 RPC listener socketsChuck Lever1-6/+4
We are about to convert to using separate RPC listener sockets for PF_INET and PF_INET6. This echoes the way IPv6 is handled in user space by TI-RPC, and eliminates the need for ULPs to worry about mapped IPv4 AF_INET6 addresses when doing address comparisons. Start by setting the IPV6ONLY flag on PF_INET6 RPC listener sockets. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28NFS: Revert creation of IPv6 listeners for lockd and NFSv4 callbacksChuck Lever2-24/+3
We're about to convert over to using separate PF_INET and PF_INET6 listeners, instead of a single PF_INET6 listener that also receives AF_INET requests and maps them to AF_INET6. Clear the way by removing the logic in lockd and the NFSv4 callback server that creates an AF_INET6 service listener. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Remove @family argument from svc_create() and svc_create_pooled()Chuck Lever5-13/+9
Since an RPC service listener's protocol family is specified now via svc_create_xprt(), it no longer needs to be passed to svc_create() or svc_create_pooled(). Remove that argument from the synopsis of those functions, and remove the sv_family field from the svc_serv struct. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Change svc_create_xprt() to take a @family argumentChuck Lever6-13/+18
The sv_family field is going away. Pass a protocol family argument to svc_create_xprt() instead of extracting the family from the passed-in svc_serv struct. Again, as this is a listener socket and not an address, we make this new argument an "int" protocol family, instead of an "sa_family_t." Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: svc_setup_socket() gets protocol family from socketChuck Lever1-3/+3
Since the sv_family field is going away, modify svc_setup_socket() to extract the protocol family from the passed-in socket instead of from the passed-in svc_serv struct. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Pass a family argument to svc_register()Chuck Lever3-13/+14
The sv_family field is going away. Instead of using sv_family, have the svc_register() function take a protocol family argument. Since this argument represents a protocol family, and not an address family, this argument takes an int, as this is what is passed to sock_create_kern(). Also make sure svc_register's helpers are checking for PF_FOO instead of AF_FOO. The value of [AP]F_FOO are equivalent; this is simply a symbolic change to reflect the semantics of the value stored in that variable. sock_create_kern() should return EPFNOSUPPORT if the passed-in protocol family isn't supported, but it uses EAFNOSUPPORT for this case. We will stick with that tradition here, as svc_register() is called by the RPC server in the same path as sock_create_kern(). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Clean up svc_find_xprt() calling sequenceChuck Lever2-6/+13
Clean up: add documentating comment and use appropriate data types for svc_find_xprt()'s arguments. This also eliminates a mixed sign comparison: @port was an int, while the return value of svc_xprt_local_port() is an unsigned short. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28NFSD: If port value written to /proc/fs/nfsd/portlist is invalid, return EINVALChuck Lever1-1/+3
Make sure port value read from user space by write_ports is valid before passing it to svc_find_xprt(). If it wasn't, the writer would get ENOENT instead of EINVAL. Noticed-by: J. Bruce Fields <bfields@fieldses.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Clean up static inline functions in svc_xprt.hChuck Lever1-20/+26
Clean up: Enable the use of const arguments in higher level svc_ APIs by adding const to the arguments of the helper functions in svc_xprt.h Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-28SUNRPC: Don't flag empty RPCB_GETADDR reply as bogusChuck Lever1-3/+8
In 2007, commit e65fe3976f594603ed7b1b4a99d3e9b867f573ea added additional sanity checking to rpcb_decode_getaddr() to make sure we were getting a reply that was long enough to be an actual universal address. If the uaddr string isn't long enough, the XDR decoder returns EIO. However, an empty string is a valid RPCB_GETADDR response if the requested service isn't registered. Moreover, "::.n.m" is also a valid RPCB_GETADDR response for IPv6 addresses that is shorter than rpcb_decode_getaddr()'s lower limit of 11. So this sanity check introduced a regression for rpcbind requests against IPv6 remotes. So revert the lower bound check added by commit e65fe3976f594603ed7b1b4a99d3e9b867f573ea, and add an explicit check for an empty uaddr string, similar to libtirpc's rpcb_getaddr(3). Pointed-out-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19NFS: Optimise NFS close()Trond Myklebust7-21/+47
Close-to-open cache consistency rules really only require us to flush out writes on calls to close(), and require us to revalidate attributes on the very last close of the file. Currently we appear to be doing a lot of extra attribute revalidation and cache flushes. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19NFS: Fix the notifications when renaming onto an existing fileTrond Myklebust1-5/+4
NFS appears to be returning an unnecessary "delete" notification when we're doing an atomic rename. See http://bugzilla.gnome.org/show_bug.cgi?id=575684 The fix is to get rid of the redundant call to d_delete(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19NFS: Fix up a mismerged patchTrond Myklebust1-1/+1
Move the definition of nfs_need_commit() into the #ifdef CONFIG_NFS_V3 section as originally intended in the patch "NFS: cleanup - remove struct nfs_inode->ncommit" Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19SVCRDMA: fix recent printk format warnings.Tom Talpey1-1/+1
printk formats in prior commit were reversed/incorrect. Compiled without warning on x86 and x86_64, but detected on ppc. Signed-off-by: Tom Talpey <tmtalpey@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19SUNRPC: Ensure we close the socket on EPIPE errors too...Trond Myklebust1-1/+1
As long as one task is holding the socket lock, then calls to xprt_force_disconnect(xprt) will not succeed in shutting down the socket. In particular, this would mean that a server initiated shutdown will not succeed until the lock is relinquished. In order to avoid the deadlock, we should ensure that xs_tcp_send_request() closes the socket on EPIPE errors too. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19SUNRPC: xs_tcp_connect_worker{4,6}: merge common codeTrond Myklebust1-68/+72
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19SUNRPC: Add a sysctl to control the duration of the socket linger timeoutTrond Myklebust1-2/+11
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-19SUNRPC: Add the equivalent of the linger and linger2 timeouts to RPC socketsTrond Myklebust2-17/+82
This fixes a regression against FreeBSD servers as reported by Tomas Kasparek. Apparently when using RPC over a TCP socket, the FreeBSD servers don't ever react to the client closing the socket, and so commit e06799f958bf7f9f8fae15f0c6f519953fb0257c (SUNRPC: Use shutdown() instead of close() when disconnecting a TCP socket) causes the setup to hang forever whenever the client attempts to close and then reconnect. We break the deadlock by adding a 'linger2' style timeout to the socket, after which, the client will abort the connection using a TCP 'RST'. The default timeout is set to 15 seconds. A subsequent patch will put it under user control by means of a systctl. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Ensure that xs_nospace return values are propagatedTrond Myklebust1-4/+7
If xs_nospace() finds that the socket has disconnected, it attempts to return ENOTCONN, however that value is then squashed by the callers. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Delay, then retry on connection errors.Trond Myklebust1-18/+16
Enforce the comment in xs_tcp_connect_worker4/xs_tcp_connect_worker6 that we should delay, then retry on certain connection errors. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Return EAGAIN instead of ENOTCONN when waking up xprt->pendingTrond Myklebust3-52/+41
While we should definitely return socket errors to the task that is currently trying to send data, there is no need to propagate the same error to all the other tasks on xprt->pending. Doing so actually slows down recovery, since it causes more than one tasks to attempt socket recovery. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Handle socket errors correctlyTrond Myklebust1-7/+5
Ensure that we pick up and handle socket errors as they occur. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Handle ECONNREFUSED correctly in xprt_transmit()Trond Myklebust3-37/+34
If we get an ECONNREFUSED error, we currently go to sleep on the 'xprt->sending' wait queue. The problem is that no timeout is set there, and there is nothing else that will wake the task up later. We should deal with ECONNREFUSED in call_status, given that is where we also deal with -EHOSTDOWN, and friends. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Don't disconnect if a connection is still in progress.Trond Myklebust1-4/+14
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Ensure we set XPRT_CLOSING only after we've sent a tcp FIN...Trond Myklebust1-4/+1
...so that we can distinguish between when we need to shutdown and when we don't. Also remove the call to xs_tcp_shutdown() from xs_tcp_connect(), since xprt_connect() makes the same test. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Avoid an unnecessary task reschedule on ENOTCONNTrond Myklebust1-8/+18
If the socket is unconnected, and xprt_transmit() returns ENOTCONN, we currently give up the lock on the transport channel. Doing so means that the lock automatically gets assigned to the next task in the xprt->sending queue, and so that task needs to be woken up to do the actual connect. The following patch aims to avoid that unnecessary task switch. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: load the rpc/rdma transport module automaticallyTom Talpey1-1/+3
When mounting an NFS/RDMA server with the "-o proto=rdma" or "-o rdma" options, attempt to dynamically load the necessary "xprtrdma" client transport module. Doing so improves usability, while avoiding a static module dependency and any unnecesary resources. Signed-off-by: Tom Talpey <tmtalpey@gmail.com> Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: dynamically load RPC transport modules on-demandTom Talpey2-0/+32
Provide an api to attempt to load any necessary kernel RPC client transport module automatically. By convention, the desired module name is "xprt"+"transport name". For example, when NFS mounting with "-o proto=rdma", attempt to load the "xprtrdma" module. Signed-off-by: Tom Talpey <tmtalpey@gmail.com> Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11XPRTRDMA: correct an rpc/rdma inline send marshaling errorTom Talpey1-12/+14
Certain client rpc's which contain both lengthy page-contained metadata and a non-empty xdr_tail buffer require careful handling to avoid overlapped memory copying. Rearranging of existing rpcrdma marshaling code avoids it; this fixes an NFSv4 symlink creation error detected with connectathon basic/test8 to multiple servers. Signed-off-by: Tom Talpey <tmtalpey@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SVCRDMA: remove faulty assertions in rpc/rdma chunk validation.Tom Talpey1-3/+5
Certain client-provided RPCRDMA chunk alignments result in an additional scatter/gather entry, which triggered nfs/rdma server assertions incorrectly. OpenSolaris nfs/rdma client connectathon testing was blocked by these in the special/locking section. Signed-off-by: Tom Talpey <tmtalpey@gmail.com> Cc: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Kill the "defined but not used" compile error on nommu machinesTrond Myklebust1-7/+5
Bryan Wu reports that when compiling NFS on nommu machines he gets a "defined but not used" error on nfs_file_mmap(). The easiest fix is simply to get rid of the special casing in NFS, and just always call generic_file_mmap() to set up the file. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Throttle page dirtying while we're flushing to diskTrond Myklebust7-29/+43
The following patch is a combination of a patch by myself and Peter Staubach. Trond: If we allow other processes to dirty pages while a process is doing a consistency sync to disk, we can end up never making progress. Peter: Attached is a patch which addresses a continuing problem with the NFS client generating out of order WRITE requests. While this is compliant with all of the current protocol specifications, there are servers in the market which can not handle out of order WRITE requests very well. Also, this may lead to sub-optimal block allocations in the underlying file system on the server. This may cause the read throughputs to be reduced when reading the file from the server. Peter: There has been a lot of work recently done to address out of order issues on a systemic level. However, the NFS client is still susceptible to the problem. Out of order WRITE requests can occur when pdflush is in the middle of writing out pages while the process dirtying the pages calls generic_file_buffered_write which calls generic_perform_write which calls balance_dirty_pages_rate_limited which ends up calling writeback_inodes which ends up calling back into the NFS client to writes out dirty pages for the same file that pdflush happens to be working with. Signed-off-by: Peter Staubach <staubach@redhat.com> [modification by Trond to merge the two similar patches] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: cleanup - remove struct nfs_inode->ncommitTrond Myklebust3-12/+17
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: Simplify some cache consistency post-op GETATTRsTrond Myklebust2-5/+13
Certain asynchronous operations such as write() do not expect (or care) that other metadata such as the file owner, mode, acls, ... change. All they want to do is update and/or check the change attribute, ctime, and mtime. By skipping the file owner and group update, we also avoid having to do a potential idmapper upcall for these asynchronous RPC calls. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: A referral is assumed to always point to a directory.Trond Myklebust1-0/+14
Fix a bug whereby we would fail to create a mount point for a referral. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: Make decode_getfattr() set fattr->valid to reflect what was decodedTrond Myklebust1-19/+73
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: Clean up decode_getfattr()Trond Myklebust1-21/+57
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Fix the type of struct nfs_fattr->modeTrond Myklebust5-47/+38
There is no point in using anything other than umode_t, since we copy the content pretty much directly into inode->i_mode. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Shrink the struct nfs_fattrTrond Myklebust2-7/+3
We don't need the bitmap[] field anymore, since the 'valid' field tells us all we need to know about which attributes were filled in... Also move the pre-op attributes in order to improve the structure packing. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: Support NFSv4 optional attributes in the struct nfs_fattrTrond Myklebust5-103/+202
Currently, filling struct nfs_fattr is more or less an all or nothing operation, since NFSv2 and NFSv3 have only mandatory attributes. In NFSv4, some attributes are optional, and so we may simply not be able to fill in those fields. Furthermore, NFSv4 allows you to specify which attributes you are interested in retrieving, thus permitting you to optimise away retrieval of attributes that you know will no change... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFSv4: Ignore errors on the post-op attributes in SETATTR callsTrond Myklebust1-3/+1
There is no need to fail or retry a SETATTR call just because the post-op GETATTR failed. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: flush cached directory information slightly more readily.NeilBrown1-2/+13
If cached directory contents becomes incorrect, there is no way to flush the contents. This contrasts with files where file locking is the recommended way to ensure cache consistency between multiple applications (a read-lock always flushes the cache). Also while changes to files often change the size of the file (thus triggering a cache flush), changes to directories often do not change the apparent size (as the size is often rounded to a block size). So it is particularly important with directories to avoid the possibility of an incorrect cache wherever possible. When the link count on a directory changes it implies a change in the number of child directories, and so a change in the contents of this directory. So use that as a trigger to flush cached contents. When the ctime changes but the mtime does not, there are two possible reasons. 1/ The owner/mode information has been changed. 2/ utimes has been used to set the mtime backwards. In the first case, a data-cache flush is not required. In the second case it is. So on the basis that correctness trumps performance, flush the directory contents cache in this case also. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Minor __nfs_revalidate_inode cleanupSuresh Jayaraman1-3/+0
Remove redundant NFS_STALE() check, a leftover due to the commit 691beb13cdc88358334ef0ba867c080a247a760f Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Avoid spurious wake-up during UDP connect processingChuck Lever1-18/+26
To clear out old state, the UDP connect workers unconditionally invoke xs_close() before proceeding with a new connect. Nowadays this causes a spurious wake-up of the task waiting for the connect to complete. This is a little racey, but usually harmless. The waiting task immediately retries the connect via a call_bind/call_connect sequence, which usually finds the transport already in the connected state because the connect worker has finished in the background. To avoid a spurious wake-up, factor the xs_close() logic that resets the underlying socket into a helper, and have the UDP connect workers call that helper instead of xs_close(). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: xprt_connect() don't abort the task if the transport isn't boundTrond Myklebust2-5/+10
If the transport isn't bound, then we should just return ENOTCONN, letting call_connect_status() and/or call_status() deal with retrying. Currently, we appear to abort all pending tasks with an EIO error. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11SUNRPC: Fix an Oops due to socket not set up yet...Trond Myklebust1-1/+9
We can Oops in both xs_udp_send_request() and xs_tcp_send_request() if the call to xs_sendpages() returns an error due to the socket not yet being set up. Deal with that situation by returning a new error: ENOTSOCK, so that we know to avoid dereferencing transport->sock. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11Bug 11061, NFS mounts droppedIan Dall1-1/+62
Addresses: http://bugzilla.kernel.org/show_bug.cgi?id=11061 sockaddr structures can't be reliably compared using memcmp() because there are padding bytes in the structure which can't be guaranteed to be the same even when the sockaddr structures refer to the same socket. Instead compare all the relevant fields. In the case of IPv6 sin6_flowinfo is not compared because it only affects QoS and sin6_scope_id is only compared if the address is "link local" because "link local" addresses need only be unique to a specific link. Signed-off-by: Ian Dall <ian@beware.dropbear.id.au> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NFS: Handle -ESTALE error in access()Suresh Jayaraman1-1/+7
Hi Trond, I have been looking at a bugreport where trying to open applications on KDE on a NFS mounted home fails temporarily. There have been multiple reports on different kernel versions pointing to this common issue: http://bugzilla.kernel.org/show_bug.cgi?id=12557 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/269954 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508866.html This issue can be reproducible consistently by doing this on a NFS mounted home (KDE): 1. Open 2 xterm sessions 2. From one of the xterm session, do "ssh -X <remote host>" 3. "stat ~/.Xauthority" on the remote SSH session 4. Close the two xterm sessions 5. On the server do a "stat ~/.Xauthority" 6. Now on the client, try to open xterm This will fail. Even if the filehandle had become stale, the NFS client should invalidate the cache/inode and should repeat LOOKUP. Looking at the packet capture when the failure occurs shows that there were two subsequent ACCESS() calls with the same filehandle and both fails with -ESTALE error. I have tested the fix below. Now the client issue a LOOKUP after the ACCESS() call fails with -ESTALE. If all this makes sense to you, can you consider this for inclusion? Thanks, If the server returns an -ESTALE error due to stale filehandle in response to an ACCESS() call, we need to invalidate the cache and inode so that LOOKUP() can be retried. Without this change, the nfs client retries ACCESS() with the same filehandle, fails again and could lead to temporary failure of applications running on nfs mounted home. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NLM: Fix GRANT callback address comparison when IPv6 is enabledChuck Lever1-1/+50
The NFS mount command may pass an AF_INET server address to lockd. If lockd happens to be using a PF_INET6 listener, the nlm_cmp_addr() in nlmclnt_grant() will fail to match requests from that host because they will all have a mapped IPv4 AF_INET6 address. Adopt the same solution used in nfs_sockaddr_match_ipaddr() for NFSv4 callbacks: if either address is AF_INET, map it to an AF_INET6 address before doing the comparison. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-03-11NLM: Shrink the IPv4-only version of nlm_cmp_addr()Chuck Lever1-0/+8
Clean up/micro-optimatization: Make the AF_INET-only version of nlm_cmp_addr() smaller. This matches the style of nlm_privileged_requester(), and makes the AF_INET-only version of nlm_cmp_addr() nearly the same size as it was before IPv6 support. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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