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path: root/fs/nfs/nfs4session.c
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2016-12-02NFSv4.1: Fix regression in callback retry handlingFred Isaman1-1/+1
When initializing a freshly created slot for the calllback channel, the seq_nr needs to be 0, not 1. Otherwise validate_seqid and nfs4_slot_wait_on_seqid get confused and believe that the mpty slot corresponds to a previously sent reply. Signed-off-by: Fred Isaman <fred.isaman@gmail.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-11-08fs/nfs: Fix used uninitialized warn in nfs4_slot_seqid_in_use()Shuah Khan1-1/+1
Fix the following warn: fs/nfs/nfs4session.c: In function ‘nfs4_slot_seqid_in_use’: fs/nfs/nfs4session.c:203:54: warning: ‘cur_seq’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (nfs4_slot_get_seqid(tbl, slotid, &cur_seq) == 0 && ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~ cur_seq == seq_nr && test_bit(slotid, tbl->used_slots)) ~~~~~~~~~~~~~~~~~ Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2016-10-24NFSv4.1: work around -Wmaybe-uninitialized warningArnd Bergmann1-4/+6
A bugfix introduced a harmless gcc warning in nfs4_slot_seqid_in_use if we enable -Wmaybe-uninitialized again: fs/nfs/nfs4session.c:203:54: error: 'cur_seq' may be used uninitialized in this function [-Werror=maybe-uninitialized] gcc is not smart enough to conclude that the IS_ERR/PTR_ERR pair results in a nonzero return value here. Using PTR_ERR_OR_ZERO() instead makes this clear to the compiler. The warning originally did not appear in v4.8 as it was globally disabled, but the bugfix that introduced the warning got backported to stable kernels which again enable it, and this is now the only warning in the v4.7 builds. Fixes: e09c978aae5b ("NFSv4.1: Fix Oopsable condition in server callback races") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2016-08-28NFSv4.1: Delay callback processing when there are referring triplesTrond Myklebust1-1/+21
If CB_SEQUENCE tells us that the processing of this request depends on the completion of one or more referring triples (see RFC 5661 Section 2.10.6.3), delay the callback processing until after the RPC requests being referred to have completed. If we end up delaying for more than 1/2 second, then fall back to returning NFS4ERR_DELAY in reply to the callback. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-08-28NFSv4.1: Fix Oopsable condition in server callback racesTrond Myklebust1-0/+33
The slot table hasn't been an array since v3.7. Ensure that we use nfs4_lookup_slot() to access the slot correctly. Fixes: 87dda67e7386 ("NFSv4.1: Allow SEQUENCE to resize the slot table...") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org # v3.8+
2016-01-25NFSv4.x: Allow multiple callbacks in flightTrond Myklebust1-12/+42
Hook the callback channel into the same session management machinery as we use for the forward channel. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2015-02-18NFSv4.1: Don't set up a backchannel if the server didn't agree to do soTrond Myklebust1-1/+1
If the server doesn't agree to out backchannel setup request, then don't set one up. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2014-02-02NFSv4.1: nfs4_destroy_session must call rpc_destroy_waitqueueTrond Myklebust1-5/+20
There may still be timers active on the session waitqueues. Make sure that we kill them before freeing the memory. Cc: stable@vger.kernel.org # 3.12+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2013-09-04When CONFIG_NFS_V4_1 is not enabled, "make C=2" emits this warning:Chuck Lever1-2/+2
linux/fs/nfs/nfs4session.c:337:6: warning: symbol 'nfs41_set_target_slotid' was not declared. Should it be static? Move nfs41_set_target_slotid() and nfs41_update_target_slotid() back behind CONFIG_NFS_V4_1, since, in the final revision of this work, they are used only in NFSv4.1 and later. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add global helper for releasing slot table resourcesChuck Lever1-6/+15
The nfs4_destroy_slot_tables() function is renamed to avoid confusion with the new helper. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Add global helper to set up a stand-along nfs4_slot_tableChuck Lever1-13/+25
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: Enable slot table helpers for NFSv4.0Chuck Lever1-8/+21
I'd like to re-use NFSv4.1's slot table machinery for NFSv4.0 transport blocking. Re-organize some of nfs4session.c so the slot table code is built even when NFS_V4_1 is disabled. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-09-03NFS: When displaying session slot numbers, use "%u" consistentlyChuck Lever1-5/+5
Clean up, since slot and sequence numbers are all unsigned anyway. Among other things, squelch compiler warnings: linux/fs/nfs/nfs4proc.c: In function ‘nfs4_setup_sequence’: linux/fs/nfs/nfs4proc.c:703:2: warning: signed and unsigned type in conditional expression [-Wsign-compare] and linux/fs/nfs/nfs4session.c: In function ‘nfs4_alloc_slot’: linux/fs/nfs/nfs4session.c:151:31: warning: signed and unsigned type in conditional expression [-Wsign-compare] Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-08-07NFS: Never use user credentials for lease renewalChuck Lever1-1/+1
Never try to use a non-UID 0 user credential for lease management, as that credential can change out from under us. The server will block NFSv4 lease recovery with NFS4ERR_CLID_INUSE. Since the mechanism to acquire a credential for lease management is now the same for all minor versions, replace the minor version- specific callout with a single function. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-06-28NFSv4.1 Refactor nfs4_init_session and nfs4_init_channel_attrsAndy Adamson1-38/+2
nfs4_init_session was originally written to be called prior to nfs4_init_channel_attrs, setting the session target_max response and request sizes that nfs4_init_channel_attrs would pay attention to. In the current code flow, nfs4_init_session, just like nfs4_init_ds_session for the data server case, is called after the session is all negotiated, and is actually used in a RECLAIM COMPLETE call to the server. Remove the un-needed fc_target_max response and request fields from nfs4_session and just set the max_resp_sz and max_rqst_sz in nfs4_init_channel_attrs. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2013-05-20NFSv4.1 Fix a pNFS session draining deadlockAndy Adamson1-2/+2
On a CB_RECALL the callback service thread flushes the inode using filemap_flush prior to scheduling the state manager thread to return the delegation. When pNFS is used and I/O has not yet gone to the data server servicing the inode, a LAYOUTGET can preceed the I/O. Unlike the async filemap_flush call, the LAYOUTGET must proceed to completion. If the state manager starts to recover data while the inode flush is sending the LAYOUTGET, a deadlock occurs as the callback service thread holds the single callback session slot until the flushing is done which blocks the state manager thread, and the state manager thread has set the session draining bit which puts the inode flush LAYOUTGET RPC to sleep on the forechannel slot table waitq. Separate the draining of the back channel from the draining of the fore channel by moving the NFS4_SESSION_DRAINING bit from session scope into the fore and back slot tables. Drain the back channel first allowing the LAYOUTGET call to proceed (and fail) so the callback service thread frees the callback slot. Then proceed with draining the forechannel. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-16NFSv4.1: Deal effectively with interrupted RPC calls.Trond Myklebust1-0/+1
If an RPC call is interrupted, assume that the server hasn't processed the RPC call so that the next time we use the slot, we know that if we get a NFS4ERR_SEQ_MISORDERED or NFS4ERR_SEQ_FALSE_RETRY, we just have to bump the sequence number. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-16NFSv4.1: Move the RPC timestamp out of the slot.Trond Myklebust1-2/+1
Shave a few bytes off the slot table size by moving the RPC timestamp into the sequence results. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-11NFSv4.1: Be conservative about the client highest slotidTrond Myklebust1-6/+16
If the server sends us a target that looks like an outlier, but is lower than the existing target, then respect it anyway. However defer actually updating the generation counter until we get a target that doesn't look like an outlier. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-06NFSv4.1: Try to eliminate outliers when updating target_highest_slotidTrond Myklebust1-5/+58
Look for sudden changes in the first and second derivatives in order to eliminate outlier changes to target_highest_slotid (which are due to out-of-order RPC replies). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-06NFSv4.1: Ensure smooth handover of slots from one task to the next waitingTrond Myklebust1-3/+56
Currently, we see a lot of bouncing for the value of highest_used_slotid due to the fact that slots are getting freed, instead of getting instantly transmitted to the next waiting task. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2012-12-06NFSv4.1: Cleanup move session slot management to fs/nfs/nfs4session.cTrond Myklebust1-0/+436
NFSv4.1 session management is getting complex enough to deserve a separate file. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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