Commit Graph

145 Commits

Author SHA1 Message Date
Trond Myklebust 444f72fe7e NFSv4.1: Fix the handling of NFS4ERR_SEQ_MISORDERED errors
Currently, the call to nfs4_schedule_session_recovery() will actually just
result in a test of the lease when what we really want is to force a
session reset.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
2011-05-27 17:42:01 -04:00
Trond Myklebust 1bd714f2a1 NFSv4: Ensure that clientid and session establishment can time out
The following patch ensures that we do not get permanently trapped in
the RPC layer when trying to establish a new client id or session.
This again ensures that the state manager can finish in a timely
fashion when the last filesystem to reference the nfs_client exits.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-04-24 14:29:33 -04:00
Trond Myklebust fd954ae124 NFSv4.1: Don't loop forever in nfs4_proc_create_session
If a server for some reason keeps sending NFS4ERR_DELAY errors, we can end
up looping forever inside nfs4_proc_create_session, and so the usual
mechanisms for detecting if the nfs_client is dead don't work.

Fix this by ensuring that we loop inside the nfs4_state_manager thread
instead.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-04-24 14:28:18 -04:00
Trond Myklebust 47c2199b6e NFSv4.1: Ensure state manager thread dies on last umount
Currently, the state manager may continue to try recovering state forever
even after the last filesystem to reference that nfs_client has umounted.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
2011-04-15 18:28:22 -04:00
Dave Chinner 0444d76ae6 fs: don't use igrab() while holding i_lock
Fix the incorrect use of igrab() inside the i_lock in NFS and Ceph‥

If we are already holding the i_lock, we have a reference to the
inode so we can safely use ihold() to gain an extra reference. This
avoids hangs due to lock recursion on the i_lock now that the
inode_lock is gone and igrab() uses the i_lock itself.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-29 07:50:34 -07:00
Andy Adamson cbdabc7f8b NFSv4.1: filelayout async error handler
Use our own async error handler.
Mark the layout as failed and retry i/o through the MDS on specified errors.

Update the mds_offset in nfs_readpage_retry so that a failed short-read retry
to a DS gets correctly resent through the MDS.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-11 15:38:43 -05:00
Andy Adamson d6fb79d433 NFSv4.1: new flag for lease time check
Data servers cannot send nfs4_proc_get_lease_time. but still need to setup
state renewal. Add the NFS_CS_CHECK_LEASE_TIME bit to indicate if the lease
time can be checked.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-11 15:38:41 -05:00
Trond Myklebust f9feab1e18 NFSv4: nfs4_state_mark_reclaim_nograce() should be static
There are no more external users of nfs4_state_mark_reclaim_nograce() or
nfs4_state_mark_reclaim_reboot(), so mark them as static.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-11 15:18:36 -05:00
Trond Myklebust 0400a6b0cb NFSv4/4.1: Fix nfs4_schedule_state_recovery abuses
nfs4_schedule_state_recovery() should only be used when we need to force
the state manager to check the lease. If we just want to start the
state manager in order to handle a state recovery situation, we should be
using nfs4_schedule_state_manager().

This patch fixes the abuses of nfs4_schedule_state_recovery() by replacing
its use with a set of helper functions that do the right thing.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-03-11 15:18:22 -05:00
Andy Adamson 778be232a2 NFS do not find client in NFSv4 pg_authenticate
The information required to find the nfs_client cooresponding to the incoming
back channel request is contained in the NFS layer. Perform minimal checking
in the RPC layer pg_authenticate method, and push more detailed checking into
the NFS layer where the nfs_client can be found.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-01-25 15:26:51 -05:00
Chuck Lever 24d292b894 NFS: Move cl_state_owners and related fields to the nfs_server struct
NFSv4 migration needs to reassociate state owners from the source to
the destination nfs_server data structures.  To make that easier, move
the cl_state_owners field to the nfs_server struct.  cl_openowner_id
and cl_lockowner_id accompany this move, as they are used in
conjunction with cl_state_owners.

The cl_lock field in the parent nfs_client continues to protect all
three of these fields.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-01-06 14:47:57 -05:00
Fred Isaman f7e8917a67 pnfs: layout roc code
A layout can request return-on-close.  How this interacts with the
forgetful model of never sending LAYOUTRETURNS is a bit ambiguous.
We forget any layouts marked roc, and wait for them to be completely
forgotten before continuing with the close.  In addition, to compensate
for races with any inflight LAYOUTGETs, and the fact that we do not get
any layout stateid back from the server, we set the barrier to the worst
case scenario of current_seqid + number of outstanding LAYOUTGETS.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-01-06 14:46:32 -05:00
Andy Adamson 42acd02182 NFS add session back channel draining
Currently session draining only drains the fore channel.
The back channel processing must also be drained.

Use the back channel highest_slot_used to indicate that a callback is being
processed by the callback thread.  Move the session complete to be per channel.

When the session is draininig, wait for any current back channel processing
to complete and stop all new back channel processing by returning NFS4ERR_DELAY
to the back channel client.

Drain the back channel, then the fore channel.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-01-06 14:46:25 -05:00
Andy Adamson 2c2618c6f2 NFS associate sessionid with callback connection
The sessions based callback service is started prior to the CREATE_SESSION call
so that it can handle CB_NULL requests which can be sent before the
CREATE_SESSION call returns and the session ID is known.

Set the callback sessionid after a sucessful CREATE_SESSION.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-01-06 14:46:24 -05:00
Linus Torvalds a4dd8dce14 Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  net/sunrpc: Use static const char arrays
  nfs4: fix channel attribute sanity-checks
  NFSv4.1: Use more sensible names for 'initialize_mountpoint'
  NFSv4.1: pnfs: filelayout: add driver's LAYOUTGET and GETDEVICEINFO infrastructure
  NFSv4.1: pnfs: add LAYOUTGET and GETDEVICEINFO infrastructure
  NFS: client needs to maintain list of inodes with active layouts
  NFS: create and destroy inode's layout cache
  NFSv4.1: pnfs: filelayout: introduce minimal file layout driver
  NFSv4.1: pnfs: full mount/umount infrastructure
  NFS: set layout driver
  NFS: ask for layouttypes during v4 fsinfo call
  NFS: change stateid to be a union
  NFSv4.1: pnfsd, pnfs: protocol level pnfs constants
  SUNRPC: define xdr_decode_opaque_fixed
  NFSD: remove duplicate NFS4_STATEID_SIZE
2010-10-26 09:52:09 -07:00
Linus Torvalds 74eb94b218 Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (67 commits)
  SUNRPC: Cleanup duplicate assignment in rpcauth_refreshcred
  nfs: fix unchecked value
  Ask for time_delta during fsinfo probe
  Revalidate caches on lock
  SUNRPC: After calling xprt_release(), we must restart from call_reserve
  NFSv4: Fix up the 'dircount' hint in encode_readdir
  NFSv4: Clean up nfs4_decode_dirent
  NFSv4: nfs4_decode_dirent must clear entry->fattr->valid
  NFSv4: Fix a regression in decode_getfattr
  NFSv4: Fix up decode_attr_filehandle() to handle the case of empty fh pointer
  NFS: Ensure we check all allocation return values in new readdir code
  NFS: Readdir plus in v4
  NFS: introduce generic decode_getattr function
  NFS: check xdr_decode for errors
  NFS: nfs_readdir_filler catch all errors
  NFS: readdir with vmapped pages
  NFS: remove page size checking code
  NFS: decode_dirent should use an xdr_stream
  SUNRPC: Add a helper function xdr_inline_peek
  NFS: remove readdir plus limit
  ...
2010-10-25 13:48:29 -07:00
Andy Adamson 974cec8ca0 NFS: client needs to maintain list of inodes with active layouts
In particular, server reboot will invalidate all layouts.

Note that in order to have an active layout, we must get a successful response
from the server.  To avoid adding that machinery, this patch just includes a
stub that fakes up a successful return.  Since the layout is never referenced
for io, this is not a problem.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Dean Hildebrand <dhildebz@umich.edu>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-24 18:07:10 -04:00
Randy Dunlap 8c7597f6ce nfs: include ratelimit.h, fix nfs4state build error
nfs4state.c uses interfaces from ratelimit.h.  It needs to include
that header file to fix build errors:

fs/nfs/nfs4state.c:1195: warning: type defaults to 'int' in declaration of 'DEFINE_RATELIMIT_STATE'
fs/nfs/nfs4state.c:1195: warning: parameter names (without types) in function declaration
fs/nfs/nfs4state.c:1195: error: invalid storage class for function 'DEFINE_RATELIMIT_STATE'
fs/nfs/nfs4state.c:1195: error: implicit declaration of function '__ratelimit'
fs/nfs/nfs4state.c:1195: error: '_rs' undeclared (first use in this function)

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	Trond Myklebust <Trond.Myklebust@netapp.com>
Cc:	linux-nfs@vger.kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23 15:27:29 -04:00
Trond Myklebust 168667c43b NFSv4: The state manager must ignore EKEYEXPIRED.
Otherwise, we cannot recover state correctly.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-23 15:27:28 -04:00
Trond Myklebust 6eaa61496f NFSv4: Don't call nfs4_reclaim_complete() on receiving NFS4ERR_STALE_CLIENTID
If the server sends us an NFS4ERR_STALE_CLIENTID while the state management
thread is busy reclaiming state, we do want to treat all state that wasn't
reclaimed before the STALE_CLIENTID as if a network partition occurred (see
the edge conditions described in RFC3530 and RFC5661).
What we do not want to do is to send an nfs4_reclaim_complete(), since we
haven't yet even started reclaiming state after the server rebooted.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org
2010-10-19 19:42:53 -04:00
Arnd Bergmann b89f432133 fs/locks.c: prepare for BKL removal
This prepares the removal of the big kernel lock from the
file locking code. We still use the BKL as long as fs/lockd
uses it and ceph might sleep, but we can flip the definition
to a private spinlock as soon as that's done.
All users outside of fs/lockd get converted to use
lock_flocks() instead of lock_kernel() where appropriate.

Based on an earlier patch to use a spinlock from Matthew
Wilcox, who has attempted this a few times before, the
earliest patch from over 10 years ago turned it into
a semaphore, which ended up being slower than the BKL
and was subsequently reverted.

Someone should do some serious performance testing when
this becomes a spinlock, since this has caused problems
before. Using a spinlock should be at least as good
as the BKL in theory, but who knows...

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Sage Weil <sage@newdream.net>
Cc: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
2010-10-05 11:02:04 +02:00
Trond Myklebust 77041ed9b4 NFSv4: Ensure the lockowners are labelled using the fl_owner and/or fl_pid
flock locks want to be labelled using the process pid, while posix locks
want to be labelled using the fl_owner.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-07-30 14:46:10 -04:00
Trond Myklebust d3c7b7ccc1 NFSv4: Add support for the RELEASE_LOCKOWNER operation
This is needed by NFSv4.0 servers in order to keep the number of locking
stateids at a manageable level.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-07-30 14:46:10 -04:00
Trond Myklebust 1f0e890dba NFSv4: Clean up struct nfs4_state_owner
The 'so_delegations' list appears to be unused.

Also eliminate so_client. If we already have so_server, we can get to the
nfs_client structure.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-06-24 15:11:43 -04:00
Trond Myklebust c48f4f3541 NFSv41: Convert the various reboot recovery ops etc to minor version ops
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-06-22 13:24:02 -04:00
Trond Myklebust a2118c33aa NFSv41: Don't store session state in the nfs_client->cl_state
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-06-22 13:24:02 -04:00
Trond Myklebust 8535b2be51 NFSv4: Don't use GFP_KERNEL allocations in state recovery
We do not want to have the state recovery thread kick off and wait for a
memory reclaim, since that may deadlock when the writebacks end up
waiting for the state recovery thread to complete.

The safe thing is therefore to use GFP_NOFS in all open, close,
delegation return, lock, etc. operations that may be called by the
state recovery thread.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14 15:09:33 -04:00
Trond Myklebust bb8b27e504 NFSv4: Clean up the NFSv4 setclientid operation
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-05-14 15:09:30 -04:00
Trond Myklebust 0f79fd6f5c NFSv4.1: Various fixes to the sequence flag error handling
Ensure that we change the EXCHANGE_ID verifier (i.e. clp->cl_boot_time)
when we want to reset all state. This is mainly needed when the server
tells us that it is revoking our open or lock stateids.

Handle revoking of recallable state by expiring the delegations.

Handle callback path issues by expiring the delegations and then resetting
the session.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-03-02 13:06:21 -05:00
Andy Adamson 41f54a5548 nfs41: clear NFS4CLNT_RECALL_SLOT bit on session reset
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-02-10 08:31:00 -05:00
Andy Adamson b9efa1b27e nfs41: implement cb_recall_slot
Drain the fore channel and reset the max_slots to the new value.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-02-10 08:30:59 -05:00
Jeff Layton 2c6434888c nfs4: handle -EKEYEXPIRED errors from RPC layer
If a KRB5 TGT ticket expires, we don't want to return an error
immediatel. If someone has a long running job and just forgets to run
"kinit" in time then this will make it fail.

Instead, we want to treat this situation as we would NFS4ERR_DELAY and
retry the upcall after delaying a bit with an exponential backoff.

This patch just makes any place that would handle NFS4ERR_DELAY also
handle -EKEYEXPIRED the same way. In the future, we may want to be more
sophisticated however and handle hard vs. soft mounts differently, or
specify some upper limit on how long we'll wait for a new TGT to be
acquired.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-02-10 08:30:50 -05:00
Trond Myklebust a2c0b9e291 NFS: Ensure that we handle NFS4ERR_STALE_STATEID correctly
Even if the server is crazy, we should be able to mark the stateid as being
bad, to ensure it gets recovered.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
2010-01-26 15:42:47 -05:00
Trond Myklebust 380454126f NFSv4: Fix a regression in the NFSv4 state manager
Commit 5601a00d67 (nfs: run state manager
in privileged mode) introduces a regression in the NFSv4 code when
compiled with CONFIG_NFS_V4_1. The calls to nfs4_end_drain_session()
from the main loop in nfs4_state_manager() Oops due to the lack of an
NFSv4.1 session when running NFSv4.0.

The fix is to move those two calls back into nfs41_init_clientid() and
nfs4_reset_session().

The calls to nfs4_end_drain_session() that remain inside
nfs4_state_manager() are safe, since the NFSv4.0 code will never set the
NFS4CLNT_SESSION_DRAINING bit.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-15 17:36:57 -05:00
Trond Myklebust 72211dbe72 NFSv4: Release the sequence id before restarting a CLOSE rpc call
If the CLOSE or OPEN_DOWNGRADE call triggers a state recovery, and has
to be resent, then we must release the seqid. Otherwise the open
recovery will wait for the close to finish, which causes a deadlock.

This is mainly a NFSv4.1 problem, although it can theoretically happen
with NFSv4.0 too, in a OPEN_DOWNGRADE situation.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-15 14:47:36 -05:00
Alexandros Batsakis 5601a00d67 nfs: run state manager in privileged mode
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-15 13:58:23 -05:00
Alexandros Batsakis 689cf5c15b nfs: enforce FIFO ordering of operations trying to acquire slot
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-15 13:55:18 -05:00
Ricardo Labiaga 7cab89b275 nfs41: Invoke RECLAIM_COMPLETE on all new client ids
The NFSv4.1 spec indicates RECLAIM_COMPLETE is to be issued
whenever a client establishes a new client id, not only after
detecting the server has rebooted.

Set the NFS4CLNT_RECLAIM_REBOOT bit after every new client id has
been established.  This enables us to issue RECLAIM_COMPLETE
during the wrap up of the NFS4CLNT_RECLAIM_REBOOT state.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-08 14:35:28 -05:00
Ricardo Labiaga f455848a11 nfs41: Mark stateids in need of reclaim if state manager gets stale clientid
The state manager was not marking the stateids as needing to be reclaimed
after reestablishing the clientid.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-07 09:16:09 -05:00
Ricardo Labiaga 9dfdf404c9 nfs41: Don't clear DRAINING flag on NFS4ERR_STALE_CLIENTID
If CREATE_SESSION fails with NFS4ERR_STALE_CLIENTID, don't clear the
NFS4CLNT_SESSION_DRAINING flag and don't wake RPCs waiting for the
session to be reestablished.  We don't have a session yet, so there
is no reason to wake other RPCs.

This avoids sending spurious compounds with bogus sequenceID during
session and state recovery.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
[Trond.Myklebust@netapp.com: cleaned up patch by adding the
                             nfs41_begin/end_drain_session() helpers]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-06 12:57:34 -05:00
Ricardo Labiaga 9430fb6b53 nfs41: nfs41_setup_state_renewal
Move call to get the lease time and the setup of the state
renewal out of nfs4_create_session so that it can be called
after clearing the DRAINING flag.  We use the getattr RPC
to obtain the lease time, which requires a sequence slot.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-06 12:23:46 -05:00
Trond Myklebust 35dc1d74a8 NFSv41: Fix up some bugs in the NFS4CLNT_SESSION_DRAINING code
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 19:32:19 -05:00
Trond Myklebust f26468fb93 NFSv41: Fix nfs4_proc_create_session
We should not assume that nfs41_init_clientid() will always want to
initialise the session. If it is being called due to a server reboot, then
we just want to reset the session after re-establishing the clientid.

Fix this by getting rid of the 'reset' parameter in
nfs4_proc_create_session(), and instead relying on whether or not the
session slot table pointer is non-NULL.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 19:32:11 -05:00
Ricardo Labiaga da6ebfe34a nfs41: Invoke RECLAIM_COMPLETE
This patch invokes RECLAIM_COMPLETE after the client is done
reclaiming state.

There are interpretations of the spec that suggest that
RECLAIM_COMPLETE should also be issued after a new clientid
has been obtained from the server and even if there is no
state to reclaim.  This tells the server that the client
has no state to reclaim even if the client isn't aware the
server may have rebooted.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 16:08:41 -05:00
Ricardo Labiaga fce5c838e1 nfs41: RECLAIM_COMPLETE functionality
Implements RECLAIM_COMPLETE as an asynchronous RPC.
NFS4ERR_DELAY is retried, NFS4ERR_DEADSESSION invokes the error handling
but does not result in a retry, since we don't want to have a lingering
RECLAIM_COMPLETE call sent in the middle of a possible new state recovery
cycle.  If a session reset occurs, a new wave of reclaim operations will
follow, containing their own RECLAIM_COMPLETE call.  We don't want a
retry to get on the way of recovery by incorrectly indicating to the
server that we're done reclaiming state.

A subsequent patch invokes the functionality.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 16:08:41 -05:00
Trond Myklebust 0556d1a695 NFSv41: nfs4_reset_session must always set NFS4CLNT_SESSION_DRAINING
Otherwise we have no guarantees that other processes won't start another
RPC call while we're resetting the session.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 15:03:20 -05:00
Alexandros Batsakis 0629e370dd nfs41: check SEQUENCE status flag
the server can indicate a number of error conditions by setting the
appropriate bits in the SEQUENCE operation. The client re-establishes
state with the server when it receives one of those, with the action
depending on the specific case.

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-05 13:46:14 -05:00
Andy Adamson 0b9e2d41f1 nfs41: only state manager sets NFS4CLNT_SESSION_SETUP
Replace sync and async handlers setting of the NFS4CLNT_SESSION_SETUP bit with
setting NFS4CLNT_CHECK_LEASE, and let the state manager decide to reset the session.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-04 16:02:14 -05:00
Andy Adamson ea028ac925 nfs41: nfs41: fix state manager deadlock in session reset
If the session is reset during state recovery, the state manager thread can
sleep on the slot_tbl_waitq causing a deadlock.

Add a completion framework to the session.  Have the state manager thread set
a new session state (NFS4CLNT_SESSION_DRAINING) and wait for the session slot
table to drain.

Signal the state manager thread in nfs41_sequence_free_slot when the
NFS4CLNT_SESSION_DRAINING bit is set and the session is drained.

Reported-by: Trond Myklebust <trond@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-04 15:55:38 -05:00
Andy Adamson 8ba9bf8e51 nfs41: fix switch in nfs4_recovery_handle_error
Do not fall through and set NFS4CLNT_SESSION_RESET bit on NFS4ERR_EXPIRED

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2009-12-04 15:55:34 -05:00