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authorTrond Myklebust <trondmy@gmail.com>2020-01-06 13:18:08 -0500
committerJ. Bruce Fields <bfields@redhat.com>2020-01-22 16:25:40 -0500
commitb6669305d35a3459877afef6e9f68e81bef92972 (patch)
treedb070c434b3d94b16a7bd43d15f78d25d8443903 /fs/nfsd/filecache.c
parent55f84cc47f73bdc84ef73b702c23051b426505a4 (diff)
nfsd: Reduce the number of calls to nfsd_file_gc()
Don't call nfsd_file_gc() on every put of the reference in nfsd_file_put(). Instead, do it only when we're expecting the refcount to go to 1. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/filecache.c')
-rw-r--r--fs/nfsd/filecache.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 4cef03a7726c..9c2b29e07975 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -282,27 +282,32 @@ nfsd_file_unhash_and_release_locked(struct nfsd_file *nf, struct list_head *disp
return true;
}
-static int
+static void
nfsd_file_put_noref(struct nfsd_file *nf)
{
- int count;
trace_nfsd_file_put(nf);
- count = atomic_dec_return(&nf->nf_ref);
- if (!count) {
+ if (atomic_dec_and_test(&nf->nf_ref)) {
WARN_ON(test_bit(NFSD_FILE_HASHED, &nf->nf_flags));
nfsd_file_free(nf);
}
- return count;
}
void
nfsd_file_put(struct nfsd_file *nf)
{
- bool is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
+ bool is_hashed;
set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
- if (nfsd_file_put_noref(nf) == 1 && is_hashed)
+ if (atomic_read(&nf->nf_ref) > 2 || !nf->nf_file) {
+ nfsd_file_put_noref(nf);
+ return;
+ }
+
+ filemap_flush(nf->nf_file->f_mapping);
+ is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
+ nfsd_file_put_noref(nf);
+ if (is_hashed)
nfsd_file_schedule_laundrette();
if (atomic_long_read(&nfsd_filecache_count) >= NFSD_FILE_LRU_LIMIT)
nfsd_file_gc();