linux-kernel - [PATCH 6.1 010/451] nfsd: add some comments to nfsd_file_do

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Message-ID: <20240324231207.1351418-11-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:04:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jeff Layton <jlayton@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Chuck Lever <chuck.lever@...cle.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.1 010/451] nfsd: add some comments to nfsd_file_do_acquire

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit b680cb9b737331aad271feebbedafb865504e234 ]

David Howells mentioned that he found this bit of code confusing, so
sprinkle in some comments to clarify.

Reported-by: David Howells <dhowells@...hat.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/filecache.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index ab37b85b72077..50349449a4e52 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -1094,6 +1094,11 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	rcu_read_unlock();
 
 	if (nf) {
+		/*
+		 * If the nf is on the LRU then it holds an extra reference
+		 * that must be put if it's removed. It had better not be
+		 * the last one however, since we should hold another.
+		 */
 		if (nfsd_file_lru_remove(nf))
 			WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref));
 		goto wait_for_construction;
-- 
2.43.0