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| author |   Robert Milkowski <rmilkowski@gmail.com> | 2020-01-30 09:43:25 +0000 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2020-02-04 12:27:55 -0500 |
| commit | 7dc2993a9e51dd2eee955944efec65bef90265b7 (patch) | |
| tree | f03a6d27ca6b837f69e3134dcd00afc4d4c21af8 /fs/nfs/nfs4renewd.c | |
| parent | NFSv4: try lease recovery on NFS4ERR_EXPIRED (diff) | |
| download | linux-dev-7dc2993a9e51dd2eee955944efec65bef90265b7.tar.xz linux-dev-7dc2993a9e51dd2eee955944efec65bef90265b7.zip | |
NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals
Currently, each time nfs4_do_fsinfo() is called it will do an implicit
NFS4 lease renewal, which is not compliant with the NFS4 specification.
This can result in a lease being expired by an NFS server.
Commit 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
introduced implicit client lease renewal in nfs4_do_fsinfo(),
which can result in the NFSv4.0 lease to expire on a server side,
and servers returning NFS4ERR_EXPIRED or NFS4ERR_STALE_CLIENTID.
This can easily be reproduced by frequently unmounting a sub-mount,
then stat'ing it to get it mounted again, which will delay or even
completely prevent client from sending RENEW operations if no other
NFS operations are issued. Eventually nfs server will expire client's
lease and return an error on file access or next RENEW.
This can also happen when a sub-mount is automatically unmounted
due to inactivity (after nfs_mountpoint_expiry_timeout), then it is
mounted again via stat(). This can result in a short window during
which client's lease will expire on a server but not on a client.
This specific case was observed on production systems.
This patch removes the implicit lease renewal from nfs4_do_fsinfo().
Fixes: 83ca7f5ab31f ("NFS: Avoid PUTROOTFH when managing leases")
Signed-off-by: Robert Milkowski <rmilkowski@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4renewd.c')
| -rw-r--r-- | fs/nfs/nfs4renewd.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c index 6ea431b067dd..ff876dda7f06 100644 --- a/fs/nfs/nfs4renewd.c +++ b/fs/nfs/nfs4renewd.c @@ -138,15 +138,12 @@ nfs4_kill_renewd(struct nfs_client *clp) * * @clp: pointer to nfs_client * @lease: new value for lease period - * @lastrenewed: time at which lease was last renewed */ void nfs4_set_lease_period(struct nfs_client *clp, - unsigned long lease, - unsigned long lastrenewed) + unsigned long lease) { spin_lock(&clp->cl_lock); clp->cl_lease_time = lease; - clp->cl_last_renewal = lastrenewed; spin_unlock(&clp->cl_lock); /* Cap maximum reconnect timeout at 1/2 lease period */ |