From: trondmy@kernel.org
To: linux-nfs@vger.kernel.org
Subject: [PATCH 4/5] NFSv4/pNFS: Don't call _nfs4_pnfs_v3_ds_connect multiple times
Date: Sat, 3 Jul 2021 22:05:09 -0400 [thread overview]
Message-ID: <20210704020510.4898-4-trondmy@kernel.org> (raw)
In-Reply-To: <20210704020510.4898-3-trondmy@kernel.org>
From: Trond Myklebust <trond.myklebust@hammerspace.com>
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>
---
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 49d3389bd813..1c2c0d08614e 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -805,19 +805,16 @@ nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
}
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)(
@@ -993,30 +990,33 @@ 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.
--
2.31.1
next prev parent reply other threads:[~2021-07-04 2:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-04 2:05 [PATCH 1/5] NFSv4/pnfs: Fix the layout barrier update trondmy
2021-07-04 2:05 ` [PATCH 2/5] NFSv4/pnfs: Fix layoutget behaviour after invalidation trondmy
2021-07-04 2:05 ` [PATCH 3/5] NFSv4/pnfs: Clean up layout get on open trondmy
2021-07-04 2:05 ` trondmy [this message]
2021-07-04 2:05 ` [PATCH 5/5] NFSv4/pNFS: Return an error if _nfs4_pnfs_v3_ds_connect can't load NFSv3 trondmy
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