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From:   trondmy@kernel.org
To:     Chuck Lever <chuck.lever@oracle.com>, Jan Kara <jack@suse.cz>
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 2/2] nfsd: Clean up nfsd_file_put()
Date:   Thu, 31 Mar 2022 09:54:02 -0400
Message-Id: <20220331135402.7187-2-trondmy@kernel.org>
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References: <20220331135402.7187-1-trondmy@kernel.org>
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From: Trond Myklebust <trond.myklebust@hammerspace.com>

Make it a little less racy, by removing the refcount_read() test. Then
remove the redundant 'is_hashed' variable.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfsd/filecache.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 9578a6317709..46714a71ec87 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -301,21 +301,14 @@ nfsd_file_put_noref(struct nfsd_file *nf)
 void
 nfsd_file_put(struct nfsd_file *nf)
 {
-	bool is_hashed;
-
 	set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
-	if (refcount_read(&nf->nf_ref) > 2 || !nf->nf_file) {
-		nfsd_file_put_noref(nf);
-		return;
-	}
-
-	is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
-	if (!is_hashed) {
+	if (test_bit(NFSD_FILE_HASHED, &nf->nf_flags) == 0) {
 		nfsd_file_flush(nf);
 		nfsd_file_put_noref(nf);
 	} else {
 		nfsd_file_put_noref(nf);
-		nfsd_file_schedule_laundrette();
+		if (nf->nf_file)
+			nfsd_file_schedule_laundrette();
 	}
 	if (atomic_long_read(&nfsd_filecache_count) >= NFSD_FILE_LRU_LIMIT)
 		nfsd_file_gc();
-- 
2.35.1