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authorBenjamin Coddington <bcodding@redhat.com>2023-06-30 16:18:13 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-08-30 17:11:05 +0300
commit14904f4d8bf8c7e12794739ee4f5ff3a346d7bb2 (patch)
tree987d31c79de310e0c872cba7cf93e93ddf47b20e /fs/nfs
parentac467d7405fe69b07b5a3fe233fd62fad7b2faec (diff)
downloadlinux-14904f4d8bf8c7e12794739ee4f5ff3a346d7bb2.tar.xz
NFSv4: Fix dropped lock for racing OPEN and delegation return
commit 1cbc11aaa01f80577b67ae02c73ee781112125fd upstream. Commmit f5ea16137a3f ("NFSv4: Retry LOCK on OLD_STATEID during delegation return") attempted to solve this problem by using nfs4's generic async error handling, but introduced a regression where v4.0 lock recovery would hang. The additional complexity introduced by overloading that error handling is not necessary for this case. This patch expects that commit to be reverted. The problem as originally explained in the above commit is: There's a small window where a LOCK sent during a delegation return can race with another OPEN on client, but the open stateid has not yet been updated. In this case, the client doesn't handle the OLD_STATEID error from the server and will lose this lock, emitting: "NFS: nfs4_handle_delegation_recall_error: unhandled error -10024". Fix this by using the old_stateid refresh helpers if the server replies with OLD_STATEID. Suggested-by: Trond Myklebust <trondmy@hammerspace.com> Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4proc.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d67383665e9b..1044305e7799 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7170,8 +7170,15 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
} else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
goto out_restart;
break;
- case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OLD_STATEID:
+ if (data->arg.new_lock_owner != 0 &&
+ nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
+ lsp->ls_state))
+ goto out_restart;
+ if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
+ goto out_restart;
+ fallthrough;
+ case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
if (data->arg.new_lock_owner != 0) {