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NFSv4: Fix NFSv4 trunking discovery 

If walking the list in nfs4[01]_walk_client_list fails, then the most
likely explanation is that the server dropped the clientid before we
actually managed to confirm it. As long as our nfs_client is the very
last one in the list to be tested, the caller can be assured that this
is the case when the final return value is NFS4ERR_STALE_CLIENTID.

Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org [>=3.7]
Tested-by: Ben Greear <greearb@candelatech.com>
This commit is contained in:
Trond Myklebust 2013-01-18 22:56:23 -05:00
parent 4ae19c2dd7
commit 202c312dba
2 changed files with 9 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
fs/nfs/nfs4client.c
View File

@ -352,14 +352,8 @@ int nfs40_walk_client_list(struct nfs_client *new,
}
spin_unlock(&nn->nfs_client_lock);
/* No match found. The server lost our clientid */
out:
/*
* No matching nfs_client found. This should be impossible,
* because the new nfs_client has already been added to
* nfs_client_list by nfs_get_client().
*
* Don't BUG(), since the caller is holding a mutex.
*/
if (prev)
nfs_put_client(prev);
dprintk("NFS: <-- %s status = %d\n", __func__, status);
@ -430,7 +424,7 @@ int nfs41_walk_client_list(struct nfs_client *new,
{
struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
struct nfs_client *pos, *n, *prev = NULL;
int error;
int status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
@ -446,8 +440,8 @@ int nfs41_walk_client_list(struct nfs_client *new,
nfs_put_client(prev);
prev = pos;
error = nfs_wait_client_init_complete(pos);
if (error < 0) {
status = nfs_wait_client_init_complete(pos);
if (status < 0) {
nfs_put_client(pos);
spin_lock(&nn->nfs_client_lock);
continue;
@ -480,16 +474,10 @@ int nfs41_walk_client_list(struct nfs_client *new,
return 0;
}
/*
* No matching nfs_client found. This should be impossible,
* because the new nfs_client has already been added to
* nfs_client_list by nfs_get_client().
*
* Don't BUG(), since the caller is holding a mutex.
*/
/* No matching nfs_client found. */
spin_unlock(&nn->nfs_client_lock);
pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
return -NFS4ERR_STALE_CLIENTID;
dprintk("NFS: <-- %s status = %d\n", __func__, status);
return status;
}
#endif /* CONFIG_NFS_V4_1 */

8
fs/nfs/nfs4state.c
View File

@ -136,16 +136,11 @@ int nfs40_discover_server_trunking(struct nfs_client *clp,
clp->cl_confirm = clid.confirm;
status = nfs40_walk_client_list(clp, result, cred);
switch (status) {
case -NFS4ERR_STALE_CLIENTID:
set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
case 0:
if (status == 0) {
/* Sustain the lease, even if it's empty. If the clientid4
* goes stale it's of no use for trunking discovery. */
nfs4_schedule_state_renewal(*result);
break;
}
out:
return status;
}
@ -1863,6 +1858,7 @@ again:
case -ETIMEDOUT:
case -EAGAIN:
ssleep(1);
case -NFS4ERR_STALE_CLIENTID:
dprintk("NFS: %s after status %d, retrying\n",
__func__, status);
goto again;