From: Trond Myklebust trond.myklebust@hammerspace.com
[ Upstream commit f46f84931a0aa344678efe412d4b071d84d8a805 ]
After we grab the lock in nfs4_pnfs_ds_connect(), there is no check for whether or not ds->ds_clp has already been initialised, so we can end up adding the same transports multiple times.
Fixes: fc821d59209d ("pnfs/NFSv4.1: Add multipath capabilities to pNFS flexfiles servers over NFSv3") Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/pnfs_nfs.c | 52 +++++++++++++++++++++++------------------------ 1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c index e3b25822e0bb..251c4a3aef9a 100644 --- a/fs/nfs/pnfs_nfs.c +++ b/fs/nfs/pnfs_nfs.c @@ -791,19 +791,16 @@ out: } EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
-static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) +static int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) { might_sleep(); - wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, - TASK_KILLABLE); + return wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, TASK_KILLABLE); }
static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) { smp_mb__before_atomic(); - clear_bit(NFS4DS_CONNECTING, &ds->ds_state); - smp_mb__after_atomic(); - wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); + clear_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state); }
static struct nfs_client *(*get_v3_ds_connect)( @@ -969,30 +966,33 @@ int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, { int err;
-again: - err = 0; - if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { - if (version == 3) { - err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, - retrans); - } else if (version == 4) { - err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, - retrans, minor_version); - } else { - dprintk("%s: unsupported DS version %d\n", __func__, - version); - err = -EPROTONOSUPPORT; - } + do { + err = nfs4_wait_ds_connect(ds); + if (err || ds->ds_clp) + goto out; + if (nfs4_test_deviceid_unavailable(devid)) + return -ENODEV; + } while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0);
- nfs4_clear_ds_conn_bit(ds); - } else { - nfs4_wait_ds_connect(ds); + if (ds->ds_clp) + goto connect_done;
- /* what was waited on didn't connect AND didn't mark unavail */ - if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) - goto again; + switch (version) { + case 3: + err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans); + break; + case 4: + err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans, + minor_version); + break; + default: + dprintk("%s: unsupported DS version %d\n", __func__, version); + err = -EPROTONOSUPPORT; }
+connect_done: + nfs4_clear_ds_conn_bit(ds); +out: /* * At this point the ds->ds_clp should be ready, but it might have * hit an error.