Patch "NFSD: Report count of freed filecache items" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    NFSD: Report count of freed filecache items

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd-report-count-of-freed-filecache-items.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3a7c685dc2fb460ec33e04b3ca4be83691bf3379
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date:   Fri Jul 8 14:24:05 2022 -0400

    NFSD: Report count of freed filecache items
    
    [ Upstream commit d63293272abb51c02457f1017dfd61c3270d9ae3 ]
    
    Surface the count of freed nfsd_file items.
    
    Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 5a09b76ae25a8..5d31622c23040 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -43,6 +43,7 @@ struct nfsd_fcache_bucket {
 
 static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits);
 static DEFINE_PER_CPU(unsigned long, nfsd_file_acquisitions);
+static DEFINE_PER_CPU(unsigned long, nfsd_file_releases);
 
 struct nfsd_fcache_disposal {
 	struct work_struct work;
@@ -195,6 +196,8 @@ nfsd_file_free(struct nfsd_file *nf)
 {
 	bool flush = false;
 
+	this_cpu_inc(nfsd_file_releases);
+
 	trace_nfsd_file_put_final(nf);
 	if (nf->nf_mark)
 		nfsd_file_mark_put(nf->nf_mark);
@@ -1049,7 +1052,7 @@ nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
  */
 static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 {
-	unsigned long hits = 0, acquisitions = 0;
+	unsigned long hits = 0, acquisitions = 0, releases = 0;
 	unsigned int i, count = 0, longest = 0;
 	unsigned long lru = 0;
 
@@ -1071,6 +1074,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	for_each_possible_cpu(i) {
 		hits += per_cpu(nfsd_file_cache_hits, i);
 		acquisitions += per_cpu(nfsd_file_acquisitions, i);
+		releases += per_cpu(nfsd_file_releases, i);
 	}
 
 	seq_printf(m, "total entries: %u\n", count);
@@ -1078,6 +1082,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 	seq_printf(m, "lru entries:   %lu\n", lru);
 	seq_printf(m, "cache hits:    %lu\n", hits);
 	seq_printf(m, "acquisitions:  %lu\n", acquisitions);
+	seq_printf(m, "releases:      %lu\n", releases);
 	return 0;
 }