[PATCH 5.15 287/690] nfsd: Clean up nfsd_file_put()

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

[ Upstream commit 999397926ab3f78c7d1235cc4ca6e3c89d2769bf ]

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@xxxxxxxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 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 6cde6ef68996e..429ae485ebbbe 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -295,21 +295,14 @@ 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();
-- 
2.43.0







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