diff options
author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-01-19 04:56:23 +0100 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-01-27 21:51:28 +0100 |
commit | 202c312dba7d95b96493b412c606163a0cd83984 (patch) | |
tree | 09bdba985da1addd3ae48e16b8953027645f2c62 /fs/nfs | |
parent | NFSv4: Fix NFSv4 reference counting for trunked sessions (diff) | |
download | linux-202c312dba7d95b96493b412c606163a0cd83984.tar.xz linux-202c312dba7d95b96493b412c606163a0cd83984.zip |
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>
Diffstat (limited to '')
-rw-r--r-- | fs/nfs/nfs4client.c | 26 | ||||
-rw-r--r-- | fs/nfs/nfs4state.c | 8 |
2 files changed, 9 insertions, 25 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 65a290a73065..2f21f17fb16c 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -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 */ diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 9448c579d41a..f72561ca6895 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -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; |