linux/fs/nfs/delegation.h, branch v4.0

NFSv4: Fix races between nfs_remove_bad_delegation() and delegation return

2014-11-12T22:19:04Z

Any attempt to call nfs_remove_bad_delegation() while a delegation is being returned is currently a no-op. This means that we can end up looping forever in nfs_end_delegation_return() if something causes the delegation to be revoked. This patch adds a mechanism whereby the state recovery code can communicate to the delegation return code that the delegation is no longer valid and that it should not be used when reclaiming state. It also changes the return value for nfs4_handle_delegation_recall_error() to ensure that nfs_end_delegation_return() does not reattempt the lock reclaim before state recovery is done. http://lkml.kernel.org/r/CAN-5tyHwG=Cn2Q9KsHWadewjpTTy_K26ee+UnSvHvG4192p-Xw@mail.gmail.com Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust

nfs4: add nfs4_check_delegation

2014-07-12T22:22:58Z

Signed-off-by: Peng Tao Signed-off-by: Trond Myklebust

NFSv4: Fix CB_RECALL_ANY to only return delegations that are not in use

2013-04-05T21:03:57Z

Signed-off-by: Trond Myklebust

NFSv4: Be less aggressive about returning delegations for open files

2013-04-05T21:03:55Z

Currently, if the application that holds the file open isn't doing I/O, we may end up returning the delegation. This means that we can no longer cache the file as aggressively, and often also that we multiply the state that both the server and the client needs to track. This patch adds a check for open files to the routine that scans for delegations that are unreferenced. Signed-off-by: Trond Myklebust

NFSv4: Clean up delegation recall error handling

2013-04-05T21:03:55Z

Unify the error handling in nfs4_open_delegation_recall and nfs4_lock_delegation_recall. Signed-off-by: Trond Myklebust

NFSv4.1: Don't lose locks when a server reboots during delegation return

2013-02-11T20:33:12Z

If the server reboots while we are converting a delegation into OPEN/LOCK stateids as part of a delegation return, the current code will simply exit with an error. This causes us to lose both delegation state and locking state (i.e. locking atomicity). Deal with this by exposing the delegation stateid during delegation return, so that we can recover the delegation, and then resume open/lock recovery. Note that not having to hold the nfs_inode->rwsem across the calls to nfs_delegation_claim_opens() also fixes a deadlock against the NFSv4.1 reboot recovery code. Signed-off-by: Trond Myklebust

NFS: Convert v4 into a module

2012-07-30T23:06:52Z

This patch exports symbols needed by the v4 module. In addition, I also switch over to using IS_ENABLED() to check if CONFIG_NFS_V4 or CONFIG_NFS_V4_MODULE are set. The module (nfs4.ko) will be created in the same directory as nfs.ko and will be automatically loaded the first time you try to mount over NFS v4. Signed-off-by: Bryan Schumaker Signed-off-by: Trond Myklebust

NFS: Create a return_delegation rpc op

2012-06-29T15:46:45Z

Delegations are a v4 feature, so push return_delegation out of the generic client by creating a new rpc_op and renaming the old function to be in the nfs v4 "namespace" Signed-off-by: Bryan Schumaker Signed-off-by: Trond Myklebust

NFS: Create a have_delegation rpc_op

2012-06-29T15:46:44Z

Delegations are a v4 feature, so push them out of the generic code. Signed-off-by: Bryan Schumaker Signed-off-by: Trond Myklebust

NFS: Use nfs4_destroy_server() to clean up NFS v4

2012-06-29T15:46:44Z

I can use this function to return delegations and unset the pnfs layout driver rather than continuing to do these things in the generic client. With this change, we no longer need an nfs4_kill_super(). Signed-off-by: Bryan Schumaker Signed-off-by: Trond Myklebust