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2008-12-26cifs: make dnotify thread experimental codeJeff Layton
Now that tasks sleeping in wait_for_response will time out on their own, we're not reliant on the dnotify thread to do this. Mark it as experimental code for now. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2008-12-26cifs: convert tcpSem to a mutexJeff Layton
Mutexes are preferred for single-holder semaphores... Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2008-12-26cifs: take module reference when starting cifsdJeff Layton
cifsd can outlive the last cifs mount. We need to hold a module reference until it exits to prevent someone from unplugging the module until we're ready. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2008-12-26cifs: display addr and prefixpath options in /proc/mountsJeff Layton
Have cifs_show_options display the addr and prefixpath options in /proc/mounts. Reduce struct dereferencing by adding some local variables. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2008-12-26cifs: remove unused SMB session pointer from struct mid_q_entryJeff Layton
Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2008-12-25Merge branches 'timers/clocksource', 'timers/hpet', 'timers/hrtimers', ↵Ingo Molnar
'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/rtc' into timers/core
2008-12-25Merge branches 'irq/sparseirq', 'irq/genirq' and 'irq/urgent'; commit ↵Ingo Molnar
'v2.6.28' into irq/core
2008-12-25Merge branch 'sched/urgent'; commit 'v2.6.28' into sched/coreIngo Molnar
2008-12-25[S390] arch_setup_additional_pages argumentsMartin Schwidefsky
arch_setup_additional_pages currently gets two arguments, the binary format descripton and an indication if the process uses an executable stack or not. The second argument is not used by anybody, it could be removed without replacement. What actually does make sense is to pass an indication if the process uses the elf interpreter or not. The glibc code will not use anything from the vdso if the process does not use the dynamic linker, so for statically linked binaries the architecture backend can choose not to map the vdso. Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-25Merge branch 'next' into for-linusJames Morris
2008-12-24Merge branch 'linus' into tracing/hw-branch-tracingIngo Molnar
2008-12-24[XFS] Fix race in xfs_write() between direct and buffered I/O with DMAPILachlan McIlroy
The iolock is dropped and re-acquired around the call to XFS_SEND_NAMESP(). While the iolock is released the file can become cached. We then 'goto retry' and - if we are doing direct I/O - mapping->nrpages may now be non zero but need_i_mutex will be zero and we will hit the WARN_ON(). Since we have dropped the I/O lock then the file size may have also changed so what we need to do here is 'goto start' like we do for the XFS_SEND_DATA() DMAPI event. We also need to update the filesize before releasing the iolock so that needs to be done before the XFS_SEND_NAMESP event. If we drop the iolock before setting the filesize we could race with a truncate. Reviewed-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
2008-12-23nfsd: support callbacks with gss flavorsOlga Kornievskaia
This patch adds server-side support for callbacks other than AUTH_SYS. Signed-off-by: Olga Kornievskaia <aglo@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23rpc: allow gss callbacks to clientOlga Kornievskaia
This patch adds client-side support to allow for callbacks other than AUTH_SYS. Signed-off-by: Olga Kornievskaia <aglo@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23rpc: pass target name down to rpc level on callbacksOlga Kornievskaia
The rpc client needs to know the principal that the setclientid was done as, so it can tell gssd who to authenticate to. Signed-off-by: Olga Kornievskaia <aglo@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23nfsd: pass client principal name in rsc downcallOlga Kornievskaia
Two principals are involved in krb5 authentication: the target, who we authenticate *to* (normally the name of the server, like nfs/server.citi.umich.edu@CITI.UMICH.EDU), and the source, we we authenticate *as* (normally a user, like bfields@UMICH.EDU) In the case of NFSv4 callbacks, the target of the callback should be the source of the client's setclientid call, and the source should be the nfs server's own principal. Therefore we allow svcgssd to pass down the name of the principal that just authenticated, so that on setclientid we can store that principal name with the new client, to be used later on callbacks. Signed-off-by: Olga Kornievskaia <aglo@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: remove unused status from encode routinesAndy Adamson
Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: increment number of operations in each encode routineAndy Adamson
Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: fix comment placement in nfs4xdr.cBenny Halevy
Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: fix tabs in nfs4xdr.cAndy Adamson
Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: remove white space from nfs4xdr.cAndy Adamson
Clean-up Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23nfs: remove incorrect usage of nfs4 compound response hdr.statusBenny Halevy
3 call sites look at hdr.status before returning success. hdr.status must be zero in this case so there's no point in this. Currently, hdr.status is correctly processed at decode_op_hdr time if the op status cannot be decoded. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23nfs: return compound hdr.status when there are no op repliesBenny Halevy
When there are no op replies encoded in the compound reply hdr.status still contains the overall status of the compound rpc. This can happen, e.g., when the server returns a NFS4ERR_MINOR_VERS_MISMATCH error. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Fix an infinite loop in the NFS state recovery codeTrond Myklebust
Marten Gajda <marten.gajda@fernuni-hagen.de> states: I tracked the problem down to the function nfs4_do_open_expired. Within this function _nfs4_open_expired is called and may return -NFS4ERR_DELAY. When a further call to _nfs4_open_expired is executed and does not return -NFS4ERR_DELAY the "exception.retry" variable is not reset to 0, causing the loop to iterate again (and as long as err != -NFS4ERR_DELAY, probably forever) Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23optimize attribute timeouts for "noac" and "actimeo=0"Peter Staubach
Hi. I've been looking at a bugzilla which describes a problem where a customer was advised to use either the "noac" or "actimeo=0" mount options to solve a consistency problem that they were seeing in the file attributes. It turned out that this solution did not work reliably for them because sometimes, the local attribute cache was believed to be valid and not timed out. (With an attribute cache timeout of 0, the cache should always appear to be timed out.) In looking at this situation, it appears to me that the problem is that the attribute cache timeout code has an off-by-one error in it. It is assuming that the cache is valid in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo]. The cache should be considered valid only in the region, [read_cache_jiffies, read_cache_jiffies + attrtimeo). With this change, the options, "noac" and "actimeo=0", work as originally expected. This problem was previously addressed by special casing the attrtimeo == 0 case. However, since the problem is only an off- by-one error, the cleaner solution is address the off-by-one error and thus, not require the special case. Thanx... ps Signed-off-by: Peter Staubach <staubach@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Convert the open and close ops to use fmodeTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: Use delegations to optimise ACCESS callsTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Ensure that we set the verifier when revalidating delegated dentriesTrond Myklebust
This ensures that we don't have to look up the dentry again after we return the delegation if we know that the directory didn't change. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up is_atomic_open()Trond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Convert delegation->type field to fmode_tTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Fix up delegation callbacksTrond Myklebust
Currently, the callback server is listening on IPv6 if it is enabled. This means that IPv4 addresses will always be mapped. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Return unreferenced delegations more promptlyTrond Myklebust
If the client is not using a delegation, the right thing to do is to return it as soon as possible. This helps reduce the amount of state the server has to track, as well as reducing the potential for conflicts with other clients. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up the asynchronous delegation returnTrond Myklebust
Reuse the state management thread in order to return delegations when we get a callback. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up nfs_expire_all_delegations()Trond Myklebust
Let the actual delegreturn stuff be run in the state manager thread rather than allocating a separate kthread. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Fix a BAD_SEQUENCEID condition.Trond Myklebust
We really shouldn't be resetting the sequence ids when doing state expiration recovery, since we don't know if the server still remembers our previous state owners. There are servers out there that do attempt to preserve client state even if the lease has expired. Such a server would only release that state if a conflicting OPEN request occurs. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Don't exit the state management if there are still tasks to doTrond Myklebust
Fix up a potential race... Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Rename the state reclaimer threadTrond Myklebust
It is really a more general purpose state management thread at this point. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up NFS4ERR_CB_PATH_DOWN error management...Trond Myklebust
Add a delegation cleanup phase to the state management loop, and do the NFS4ERR_CB_PATH_DOWN recovery there. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up the support for returning multiple delegationsTrond Myklebust
Add a flag to mark delegations as requiring return, then run a garbage collector. In the future, this will allow for more flexible delegation management, where delegations may be marked for return if it turns out that they are not being referenced. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Add recovery for individual stateidsTrond Myklebust
NFSv4 defines a number of state errors which the client does not currently handle. Among those we should worry about are: NFS4ERR_ADMIN_REVOKED - the server's administrator revoked our locks and/or delegations. NFS4ERR_BAD_STATEID - the client and server are out of sync, possibly due to a delegation return racing with an OPEN request. NFS4ERR_OPENMODE - the client attempted to do something not sanctioned by the open mode of the stateid. Should normally just occur as a result of a delegation return race. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Remove nfs_client->cl_semTrond Myklebust
Now that we're using the flags to indicate state that needs to be recovered, as well as having implemented proper refcounting and spinlocking on the state and open_owners, we can get rid of nfs_client->cl_sem. The only remaining case that was dubious was the file locking, and that case is now covered by the nfsi->rwsem. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Ensure that file unlock requests don't conflict with state recoveryTrond Myklebust
The unlock path is currently failing to take the nfs_client->cl_sem read lock, and hence the recovery path may see locks disappear from underneath it. Also ensure that it takes the nfs_inode->rwsem read lock so that it there is no conflict with delegation recalls. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFS: Remove the unnecessary argument to nfs4_wait_clnt_recover()Trond Myklebust
...and move some code around in order to clear out an unnecessary forward declaration. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Ensure that nfs4_reclaim_open_state() doesn't depend on cl_semTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Add a recovery marking scheme for state ownersTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Don't tell server we rebooted when not necessaryTrond Myklebust
Instead of doing a full setclientid, try doing a RENEW call first. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Remove redundant RENEW calls if we know the lease has expiredTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Fix state recovery when the client runs over the grace periodTrond Myklebust
If the client for some reason is not able to recover all its state within the time allotted for the grace period, and the server reboots again, the client is not allowed to recover the state that was 'lost' using reboot recovery. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Callers to nfs4_get_renew_cred() need to hold nfs_client->cl_lockTrond Myklebust
Ditto for nfs4_get_setclientid_cred(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23NFSv4: Clean up for the state loss reclaimerTrond Myklebust
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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