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nfs: handle NFSv2 -EKEYEXPIRED returns from RPC layer appropriately 

Add a wrapper around rpc_call_sync that handles -EKEYEXPIRED errors from
the RPC layer as it would an -EJUKEBOX error if NFSv2 had such a thing.
Also, add a handler for that error for async calls that makes it
resubmit the RPC on -EKEYEXPIRED.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jeff Layton 2010-01-08 12:17:21 -05:00 committed by Trond Myklebust
parent b68d69b8c6
commit 97cefcc6d0
1 changed files with 41 additions and 0 deletions
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41
fs/nfs/proc.c
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@ -46,6 +46,39 @@
#define NFSDBG_FACILITY NFSDBG_PROC
/*
* wrapper to handle the -EKEYEXPIRED error message. This should generally
* only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
* support the NFSERR_JUKEBOX error code, but we handle this situation in the
* same way that we handle that error with NFSv3.
*/
static int
nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
int res;
do {
res = rpc_call_sync(clnt, msg, flags);
if (res != -EKEYEXPIRED)
break;
schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
res = -ERESTARTSYS;
} while (!fatal_signal_pending(current));
return res;
}
#define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
static int
nfs_async_handle_expired_key(struct rpc_task *task)
{
if (task->tk_status != -EKEYEXPIRED)
return 0;
task->tk_status = 0;
rpc_restart_call(task);
rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
return 1;
}
/*
* Bare-bones access to getattr: this is for nfs_read_super.
*/
@ -307,6 +340,8 @@ nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
if (nfs_async_handle_expired_key(task))
return 0;
nfs_mark_for_revalidate(dir);
return 1;
}
@ -560,6 +595,9 @@ nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
if (nfs_async_handle_expired_key(task))
return -EAGAIN;
nfs_invalidate_atime(data->inode);
if (task->tk_status >= 0) {
nfs_refresh_inode(data->inode, data->res.fattr);
@ -579,6 +617,9 @@ static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *
static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
if (nfs_async_handle_expired_key(task))
return -EAGAIN;
if (task->tk_status >= 0)
nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
return 0;