[PATCH 6.1 164/215] nfsd: fix up the filecache laundrette scheduling

Greg Kroah-Hartman
2024-03-04T21:50:01Z

From: Jeff Layton <jlayton@kernel.org>

[ Upstream commit 22ae4c114f77b55a4c5036e8f70409a0799a08f8 ]

We don't really care whether there are hashed entries when it comes to
scheduling the laundrette. They might all be non-gc entries, after all.
We only want to schedule it if there are entries on the LRU.

Switch to using list_lru_count, and move the check into
nfsd_file_gc_worker. The other callsite in nfsd_file_put doesn't need to
count entries, since it only schedules the laundrette after adding an
entry to the LRU.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/nfsd/filecache.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -211,12 +211,9 @@ static const struct rhashtable_params nf
static void
nfsd_file_schedule_laundrette(void)
{
- if ((atomic_read(&nfsd_file_rhash_tbl.nelems) == 0) ||
- test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 0)
- return;
-
- queue_delayed_work(system_wq, &nfsd_filecache_laundrette,
- NFSD_LAUNDRETTE_DELAY);
+ if (test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags))
+ queue_delayed_work(system_wq, &nfsd_filecache_laundrette,
+ NFSD_LAUNDRETTE_DELAY);
}

static void
@@ -614,7 +611,8 @@ static void
nfsd_file_gc_worker(struct work_struct *work)
{
nfsd_file_gc();
- nfsd_file_schedule_laundrette();
+ if (list_lru_count(&nfsd_file_lru))
+ nfsd_file_schedule_laundrette();
}

static unsigned long