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From:   Jeff Layton <jlayton@kernel.org>
To:     chuck.lever@oracle.com
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 3/4] nfsd: don't kill nfsd_files because of lease break error
Date:   Thu,  5 Jan 2023 07:15:11 -0500
Message-Id: <20230105121512.21484-4-jlayton@kernel.org>
In-Reply-To: <20230105121512.21484-1-jlayton@kernel.org>
References: <20230105121512.21484-1-jlayton@kernel.org>
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An error from break_lease is non-fatal, so we needn't destroy the
nfsd_file in that case. Just put the reference like we normally would
and return the error.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/filecache.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index a67b22579c6e..f0ca9501edb2 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -1113,7 +1113,7 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	nf = nfsd_file_alloc(&key, may_flags);
 	if (!nf) {
 		status = nfserr_jukebox;
-		goto out_status;
+		goto out;
 	}
 
 	ret = rhashtable_lookup_insert_key(&nfsd_file_rhash_tbl,
@@ -1122,13 +1122,11 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (likely(ret == 0))
 		goto open_file;
 
-	nfsd_file_slab_free(&nf->nf_rcu);
-	nf = NULL;
 	if (ret == -EEXIST)
 		goto retry;
 	trace_nfsd_file_insert_err(rqstp, key.inode, may_flags, ret);
 	status = nfserr_jukebox;
-	goto out_status;
+	goto construction_err;
 
 wait_for_construction:
 	wait_on_bit(&nf->nf_flags, NFSD_FILE_PENDING, TASK_UNINTERRUPTIBLE);
@@ -1138,28 +1136,24 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		trace_nfsd_file_cons_err(rqstp, key.inode, may_flags, nf);
 		if (!open_retry) {
 			status = nfserr_jukebox;
-			goto out;
+			goto construction_err;
 		}
 		open_retry = false;
-		if (refcount_dec_and_test(&nf->nf_ref))
-			nfsd_file_free(nf);
 		goto retry;
 	}
-
 	this_cpu_inc(nfsd_file_cache_hits);
 
 	status = nfserrno(nfsd_open_break_lease(file_inode(nf->nf_file), may_flags));
+	if (status != nfs_ok) {
+		nfsd_file_put(nf);
+		nf = NULL;
+	}
+
 out:
 	if (status == nfs_ok) {
 		this_cpu_inc(nfsd_file_acquisitions);
 		*pnf = nf;
-	} else {
-		if (refcount_dec_and_test(&nf->nf_ref))
-			nfsd_file_free(nf);
-		nf = NULL;
 	}
-
-out_status:
 	put_cred(key.cred);
 	trace_nfsd_file_acquire(rqstp, key.inode, may_flags, nf, status);
 	return status;
@@ -1189,6 +1183,13 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (status != nfs_ok)
 		nfsd_file_unhash(nf);
 	clear_and_wake_up_bit(NFSD_FILE_PENDING, &nf->nf_flags);
+	if (status == nfs_ok)
+		goto out;
+
+construction_err:
+	if (refcount_dec_and_test(&nf->nf_ref))
+		nfsd_file_free(nf);
+	nf = NULL;
 	goto out;
 }
 
-- 
2.39.0