5 files changed, 223 insertions, 282 deletions

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 697acf5c3..ee9c92319 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -74,70 +74,9 @@ static struct list_lru			nfsd_file_lru;
 static unsigned long			nfsd_file_flags;
 static struct fsnotify_group		*nfsd_file_fsnotify_group;
 static struct delayed_work		nfsd_filecache_laundrette;
-static struct rhashtable		nfsd_file_rhash_tbl
+static struct rhltable			nfsd_file_rhltable
 						____cacheline_aligned_in_smp;
 
-enum nfsd_file_lookup_type {
-	NFSD_FILE_KEY_INODE,
-	NFSD_FILE_KEY_FULL,
-};
-
-struct nfsd_file_lookup_key {
-	struct inode			*inode;
-	struct net			*net;
-	const struct cred		*cred;
-	unsigned char			need;
-	bool				gc;
-	enum nfsd_file_lookup_type	type;
-};
-
-/*
- * The returned hash value is based solely on the address of an in-code
- * inode, a pointer to a slab-allocated object. The entropy in such a
- * pointer is concentrated in its middle bits.
- */
-static u32 nfsd_file_inode_hash(const struct inode *inode, u32 seed)
-{
-	unsigned long ptr = (unsigned long)inode;
-	u32 k;
-
-	k = ptr >> L1_CACHE_SHIFT;
-	k &= 0x00ffffff;
-	return jhash2(&k, 1, seed);
-}
-
-/**
- * nfsd_file_key_hashfn - Compute the hash value of a lookup key
- * @data: key on which to compute the hash value
- * @len: rhash table's key_len parameter (unused)
- * @seed: rhash table's random seed of the day
- *
- * Return value:
- *   Computed 32-bit hash value
- */
-static u32 nfsd_file_key_hashfn(const void *data, u32 len, u32 seed)
-{
-	const struct nfsd_file_lookup_key *key = data;
-
-	return nfsd_file_inode_hash(key->inode, seed);
-}
-
-/**
- * nfsd_file_obj_hashfn - Compute the hash value of an nfsd_file
- * @data: object on which to compute the hash value
- * @len: rhash table's key_len parameter (unused)
- * @seed: rhash table's random seed of the day
- *
- * Return value:
- *   Computed 32-bit hash value
- */
-static u32 nfsd_file_obj_hashfn(const void *data, u32 len, u32 seed)
-{
-	const struct nfsd_file *nf = data;
-
-	return nfsd_file_inode_hash(nf->nf_inode, seed);
-}
-
 static bool
 nfsd_match_cred(const struct cred *c1, const struct cred *c2)
 {
@@ -158,53 +97,16 @@ nfsd_match_cred(const struct cred *c1, const struct cred *c2)
 	return true;
 }
 
-/**
- * nfsd_file_obj_cmpfn - Match a cache item against search criteria
- * @arg: search criteria
- * @ptr: cache item to check
- *
- * Return values:
- *   %0 - Item matches search criteria
- *   %1 - Item does not match search criteria
- */
-static int nfsd_file_obj_cmpfn(struct rhashtable_compare_arg *arg,
-			       const void *ptr)
-{
-	const struct nfsd_file_lookup_key *key = arg->key;
-	const struct nfsd_file *nf = ptr;
-
-	switch (key->type) {
-	case NFSD_FILE_KEY_INODE:
-		if (nf->nf_inode != key->inode)
-			return 1;
-		break;
-	case NFSD_FILE_KEY_FULL:
-		if (nf->nf_inode != key->inode)
-			return 1;
-		if (nf->nf_may != key->need)
-			return 1;
-		if (nf->nf_net != key->net)
-			return 1;
-		if (!nfsd_match_cred(nf->nf_cred, key->cred))
-			return 1;
-		if (!!test_bit(NFSD_FILE_GC, &nf->nf_flags) != key->gc)
-			return 1;
-		if (test_bit(NFSD_FILE_HASHED, &nf->nf_flags) == 0)
-			return 1;
-		break;
-	}
-	return 0;
-}
-
 static const struct rhashtable_params nfsd_file_rhash_params = {
 	.key_len		= sizeof_field(struct nfsd_file, nf_inode),
 	.key_offset		= offsetof(struct nfsd_file, nf_inode),
-	.head_offset		= offsetof(struct nfsd_file, nf_rhash),
-	.hashfn			= nfsd_file_key_hashfn,
-	.obj_hashfn		= nfsd_file_obj_hashfn,
-	.obj_cmpfn		= nfsd_file_obj_cmpfn,
-	/* Reduce resizing churn on light workloads */
-	.min_size		= 512,		/* buckets */
+	.head_offset		= offsetof(struct nfsd_file, nf_rlist),
+
+	/*
+	 * Start with a single page hash table to reduce resizing churn
+	 * on light workloads.
+	 */
+	.min_size		= 256,
 	.automatic_shrinking	= true,
 };
 
@@ -307,27 +209,27 @@ nfsd_file_mark_find_or_create(struct nfsd_file *nf, struct inode *inode)
 }
 
 static struct nfsd_file *
-nfsd_file_alloc(struct nfsd_file_lookup_key *key, unsigned int may)
+nfsd_file_alloc(struct net *net, struct inode *inode, unsigned char need,
+		bool want_gc)
 {
 	struct nfsd_file *nf;
 
 	nf = kmem_cache_alloc(nfsd_file_slab, GFP_KERNEL);
-	if (nf) {
-		INIT_LIST_HEAD(&nf->nf_lru);
-		nf->nf_birthtime = ktime_get();
-		nf->nf_file = NULL;
-		nf->nf_cred = get_current_cred();
-		nf->nf_net = key->net;
-		nf->nf_flags = 0;
-		__set_bit(NFSD_FILE_HASHED, &nf->nf_flags);
-		__set_bit(NFSD_FILE_PENDING, &nf->nf_flags);
-		if (key->gc)
-			__set_bit(NFSD_FILE_GC, &nf->nf_flags);
-		nf->nf_inode = key->inode;
-		refcount_set(&nf->nf_ref, 1);
-		nf->nf_may = key->need;
-		nf->nf_mark = NULL;
-	}
+	if (unlikely(!nf))
+		return NULL;
+
+	INIT_LIST_HEAD(&nf->nf_lru);
+	nf->nf_birthtime = ktime_get();
+	nf->nf_file = NULL;
+	nf->nf_cred = get_current_cred();
+	nf->nf_net = net;
+	nf->nf_flags = want_gc ?
+		BIT(NFSD_FILE_HASHED) | BIT(NFSD_FILE_PENDING) | BIT(NFSD_FILE_GC) :
+		BIT(NFSD_FILE_HASHED) | BIT(NFSD_FILE_PENDING);
+	nf->nf_inode = inode;
+	refcount_set(&nf->nf_ref, 1);
+	nf->nf_may = need;
+	nf->nf_mark = NULL;
 	return nf;
 }
 
@@ -352,8 +254,8 @@ static void
 nfsd_file_hash_remove(struct nfsd_file *nf)
 {
 	trace_nfsd_file_unhash(nf);
-	rhashtable_remove_fast(&nfsd_file_rhash_tbl, &nf->nf_rhash,
-			       nfsd_file_rhash_params);
+	rhltable_remove(&nfsd_file_rhltable, &nf->nf_rlist,
+			nfsd_file_rhash_params);
 }
 
 static bool
@@ -380,10 +282,8 @@ nfsd_file_free(struct nfsd_file *nf)
 	if (nf->nf_mark)
 		nfsd_file_mark_put(nf->nf_mark);
 	if (nf->nf_file) {
-		get_file(nf->nf_file);
-		filp_close(nf->nf_file, NULL);
 		nfsd_file_check_write_error(nf);
-		fput(nf->nf_file);
+		filp_close(nf->nf_file, NULL);
 	}
 
 	/*
@@ -402,13 +302,23 @@ nfsd_file_check_writeback(struct nfsd_file *nf)
 	struct file *file = nf->nf_file;
 	struct address_space *mapping;
 
-	if (!file || !(file->f_mode & FMODE_WRITE))
+	/* File not open for write? */
+	if (!(file->f_mode & FMODE_WRITE))
+		return false;
+
+	/*
+	 * Some filesystems (e.g. NFS) flush all dirty data on close.
+	 * On others, there is no need to wait for writeback.
+	 */
+	if (!(file_inode(file)->i_sb->s_export_op->flags & EXPORT_OP_FLUSH_ON_CLOSE))
 		return false;
+
 	mapping = file->f_mapping;
 	return mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) ||
 		mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK);
 }
 
+
 static bool nfsd_file_lru_add(struct nfsd_file *nf)
 {
 	set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
@@ -431,7 +341,7 @@ static bool nfsd_file_lru_remove(struct nfsd_file *nf)
 struct nfsd_file *
 nfsd_file_get(struct nfsd_file *nf)
 {
-	if (likely(refcount_inc_not_zero(&nf->nf_ref)))
+	if (nf && refcount_inc_not_zero(&nf->nf_ref))
 		return nf;
 	return NULL;
 }
@@ -492,49 +402,26 @@ nfsd_file_dispose_list(struct list_head *dispose)
 	}
 }
 
-static void
-nfsd_file_list_remove_disposal(struct list_head *dst,
-		struct nfsd_fcache_disposal *l)
-{
-	spin_lock(&l->lock);
-	list_splice_init(&l->freeme, dst);
-	spin_unlock(&l->lock);
-}
-
-static void
-nfsd_file_list_add_disposal(struct list_head *files, struct net *net)
-{
-	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
-	struct nfsd_fcache_disposal *l = nn->fcache_disposal;
-
-	spin_lock(&l->lock);
-	list_splice_tail_init(files, &l->freeme);
-	spin_unlock(&l->lock);
-	queue_work(nfsd_filecache_wq, &l->work);
-}
-
-static void
-nfsd_file_list_add_pernet(struct list_head *dst, struct list_head *src,
-		struct net *net)
-{
-	struct nfsd_file *nf, *tmp;
-
-	list_for_each_entry_safe(nf, tmp, src, nf_lru) {
-		if (nf->nf_net == net)
-			list_move_tail(&nf->nf_lru, dst);
-	}
-}
-
+/**
+ * nfsd_file_dispose_list_delayed - move list of dead files to net's freeme list
+ * @dispose: list of nfsd_files to be disposed
+ *
+ * Transfers each file to the "freeme" list for its nfsd_net, to eventually
+ * be disposed of by the per-net garbage collector.
+ */
 static void
 nfsd_file_dispose_list_delayed(struct list_head *dispose)
 {
-	LIST_HEAD(list);
-	struct nfsd_file *nf;
-
 	while(!list_empty(dispose)) {
-		nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
-		nfsd_file_list_add_pernet(&list, dispose, nf->nf_net);
-		nfsd_file_list_add_disposal(&list, nf->nf_net);
+		struct nfsd_file *nf = list_first_entry(dispose,
+						struct nfsd_file, nf_lru);
+		struct nfsd_net *nn = net_generic(nf->nf_net, nfsd_net_id);
+		struct nfsd_fcache_disposal *l = nn->fcache_disposal;
+
+		spin_lock(&l->lock);
+		list_move_tail(&nf->nf_lru, &l->freeme);
+		spin_unlock(&l->lock);
+		queue_work(nfsd_filecache_wq, &l->work);
 	}
 }
 
@@ -678,8 +565,8 @@ nfsd_file_cond_queue(struct nfsd_file *nf, struct list_head *dispose)
  * @inode:   inode on which to close out nfsd_files
  * @dispose: list on which to gather nfsd_files to close out
  *
- * An nfsd_file represents a struct file being held open on behalf of nfsd. An
- * open file however can block other activity (such as leases), or cause
+ * An nfsd_file represents a struct file being held open on behalf of nfsd.
+ * An open file however can block other activity (such as leases), or cause
  * undesirable behavior (e.g. spurious silly-renames when reexporting NFS).
  *
  * This function is intended to find open nfsd_files when this sort of
@@ -692,20 +579,17 @@ nfsd_file_cond_queue(struct nfsd_file *nf, struct list_head *dispose)
 static void
 nfsd_file_queue_for_close(struct inode *inode, struct list_head *dispose)
 {
-	struct nfsd_file_lookup_key key = {
-		.type	= NFSD_FILE_KEY_INODE,
-		.inode	= inode,
-	};
+	struct rhlist_head *tmp, *list;
 	struct nfsd_file *nf;
 
 	rcu_read_lock();
-	do {
-		nf = rhashtable_lookup(&nfsd_file_rhash_tbl, &key,
-				       nfsd_file_rhash_params);
-		if (!nf)
-			break;
+	list = rhltable_lookup(&nfsd_file_rhltable, &inode,
+			       nfsd_file_rhash_params);
+	rhl_for_each_entry_rcu(nf, tmp, list, nf_rlist) {
+		if (!test_bit(NFSD_FILE_GC, &nf->nf_flags))
+			continue;
 		nfsd_file_cond_queue(nf, dispose);
-	} while (1);
+	}
 	rcu_read_unlock();
 }
 
@@ -758,8 +642,8 @@ nfsd_file_close_inode_sync(struct inode *inode)
  * nfsd_file_delayed_close - close unused nfsd_files
  * @work: dummy
  *
- * Walk the LRU list and destroy any entries that have not been used since
- * the last scan.
+ * Scrape the freeme list for this nfsd_net, and then dispose of them
+ * all.
  */
 static void
 nfsd_file_delayed_close(struct work_struct *work)
@@ -768,7 +652,10 @@ nfsd_file_delayed_close(struct work_struct *work)
 	struct nfsd_fcache_disposal *l = container_of(work,
 			struct nfsd_fcache_disposal, work);
 
-	nfsd_file_list_remove_disposal(&head, l);
+	spin_lock(&l->lock);
+	list_splice_init(&l->freeme, &head);
+	spin_unlock(&l->lock);
+
 	nfsd_file_dispose_list(&head);
 }
 
@@ -829,7 +716,7 @@ nfsd_file_cache_init(void)
 	if (test_and_set_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 1)
 		return 0;
 
-	ret = rhashtable_init(&nfsd_file_rhash_tbl, &nfsd_file_rhash_params);
+	ret = rhltable_init(&nfsd_file_rhltable, &nfsd_file_rhash_params);
 	if (ret)
 		return ret;
 
@@ -897,7 +784,7 @@ out_err:
 	nfsd_file_mark_slab = NULL;
 	destroy_workqueue(nfsd_filecache_wq);
 	nfsd_filecache_wq = NULL;
-	rhashtable_destroy(&nfsd_file_rhash_tbl);
+	rhltable_destroy(&nfsd_file_rhltable);
 	goto out;
 }
 
@@ -906,7 +793,8 @@ out_err:
  * @net: net-namespace to shut down the cache (may be NULL)
  *
  * Walk the nfsd_file cache and close out any that match @net. If @net is NULL,
- * then close out everything. Called when an nfsd instance is being shut down.
+ * then close out everything. Called when an nfsd instance is being shut down,
+ * and when the exports table is flushed.
  */
 static void
 __nfsd_file_cache_purge(struct net *net)
@@ -915,7 +803,7 @@ __nfsd_file_cache_purge(struct net *net)
 	struct nfsd_file *nf;
 	LIST_HEAD(dispose);
 
-	rhashtable_walk_enter(&nfsd_file_rhash_tbl, &iter);
+	rhltable_walk_enter(&nfsd_file_rhltable, &iter);
 	do {
 		rhashtable_walk_start(&iter);
 
@@ -1021,7 +909,7 @@ nfsd_file_cache_shutdown(void)
 	nfsd_file_mark_slab = NULL;
 	destroy_workqueue(nfsd_filecache_wq);
 	nfsd_filecache_wq = NULL;
-	rhashtable_destroy(&nfsd_file_rhash_tbl);
+	rhltable_destroy(&nfsd_file_rhltable);
 
 	for_each_possible_cpu(i) {
 		per_cpu(nfsd_file_cache_hits, i) = 0;
@@ -1032,6 +920,35 @@ nfsd_file_cache_shutdown(void)
 	}
 }
 
+static struct nfsd_file *
+nfsd_file_lookup_locked(const struct net *net, const struct cred *cred,
+			struct inode *inode, unsigned char need,
+			bool want_gc)
+{
+	struct rhlist_head *tmp, *list;
+	struct nfsd_file *nf;
+
+	list = rhltable_lookup(&nfsd_file_rhltable, &inode,
+			       nfsd_file_rhash_params);
+	rhl_for_each_entry_rcu(nf, tmp, list, nf_rlist) {
+		if (nf->nf_may != need)
+			continue;
+		if (nf->nf_net != net)
+			continue;
+		if (!nfsd_match_cred(nf->nf_cred, cred))
+			continue;
+		if (test_bit(NFSD_FILE_GC, &nf->nf_flags) != want_gc)
+			continue;
+		if (test_bit(NFSD_FILE_HASHED, &nf->nf_flags) == 0)
+			continue;
+
+		if (!nfsd_file_get(nf))
+			continue;
+		return nf;
+	}
+	return NULL;
+}
+
 /**
  * nfsd_file_is_cached - are there any cached open files for this inode?
  * @inode: inode to check
@@ -1046,15 +963,20 @@ nfsd_file_cache_shutdown(void)
 bool
 nfsd_file_is_cached(struct inode *inode)
 {
-	struct nfsd_file_lookup_key key = {
-		.type	= NFSD_FILE_KEY_INODE,
-		.inode	= inode,
-	};
+	struct rhlist_head *tmp, *list;
+	struct nfsd_file *nf;
 	bool ret = false;
 
-	if (rhashtable_lookup_fast(&nfsd_file_rhash_tbl, &key,
-				   nfsd_file_rhash_params) != NULL)
-		ret = true;
+	rcu_read_lock();
+	list = rhltable_lookup(&nfsd_file_rhltable, &inode,
+			       nfsd_file_rhash_params);
+	rhl_for_each_entry_rcu(nf, tmp, list, nf_rlist)
+		if (test_bit(NFSD_FILE_GC, &nf->nf_flags)) {
+			ret = true;
+			break;
+		}
+	rcu_read_unlock();
+
 	trace_nfsd_file_is_cached(inode, (int)ret);
 	return ret;
 }
@@ -1064,14 +986,12 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		     unsigned int may_flags, struct file *file,
 		     struct nfsd_file **pnf, bool want_gc)
 {
-	struct nfsd_file_lookup_key key = {
-		.type	= NFSD_FILE_KEY_FULL,
-		.need	= may_flags & NFSD_FILE_MAY_MASK,
-		.net	= SVC_NET(rqstp),
-		.gc	= want_gc,
-	};
+	unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
+	struct net *net = SVC_NET(rqstp);
+	struct nfsd_file *new, *nf;
+	const struct cred *cred;
 	bool open_retry = true;
-	struct nfsd_file *nf;
+	struct inode *inode;
 	__be32 status;
 	int ret;
 
@@ -1079,81 +999,88 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 				may_flags|NFSD_MAY_OWNER_OVERRIDE);
 	if (status != nfs_ok)
 		return status;
-	key.inode = d_inode(fhp->fh_dentry);
-	key.cred = get_current_cred();
+	inode = d_inode(fhp->fh_dentry);
+	cred = get_current_cred();
 
 retry:
 	rcu_read_lock();
-	nf = rhashtable_lookup(&nfsd_file_rhash_tbl, &key,
-			       nfsd_file_rhash_params);
-	if (nf)
-		nf = nfsd_file_get(nf);
+	nf = nfsd_file_lookup_locked(net, cred, inode, need, want_gc);
 	rcu_read_unlock();
 
 	if (nf) {
+		/*
+		 * If the nf is on the LRU then it holds an extra reference
+		 * that must be put if it's removed. It had better not be
+		 * the last one however, since we should hold another.
+		 */
 		if (nfsd_file_lru_remove(nf))
 			WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref));
 		goto wait_for_construction;
 	}
 
-	nf = nfsd_file_alloc(&key, may_flags);
-	if (!nf) {
+	new = nfsd_file_alloc(net, inode, need, want_gc);
+	if (!new) {
 		status = nfserr_jukebox;
-		goto out_status;
+		goto out;
 	}
 
-	ret = rhashtable_lookup_insert_key(&nfsd_file_rhash_tbl,
-					   &key, &nf->nf_rhash,
-					   nfsd_file_rhash_params);
+	rcu_read_lock();
+	spin_lock(&inode->i_lock);
+	nf = nfsd_file_lookup_locked(net, cred, inode, need, want_gc);
+	if (unlikely(nf)) {
+		spin_unlock(&inode->i_lock);
+		rcu_read_unlock();
+		nfsd_file_slab_free(&new->nf_rcu);
+		goto wait_for_construction;
+	}
+	nf = new;
+	ret = rhltable_insert(&nfsd_file_rhltable, &nf->nf_rlist,
+			      nfsd_file_rhash_params);
+	spin_unlock(&inode->i_lock);
+	rcu_read_unlock();
 	if (likely(ret == 0))
 		goto open_file;
 
-	nfsd_file_slab_free(&nf->nf_rcu);
-	nf = NULL;
 	if (ret == -EEXIST)
 		goto retry;
-	trace_nfsd_file_insert_err(rqstp, key.inode, may_flags, ret);
+	trace_nfsd_file_insert_err(rqstp, inode, may_flags, ret);
 	status = nfserr_jukebox;
-	goto out_status;
+	goto construction_err;
 
 wait_for_construction:
 	wait_on_bit(&nf->nf_flags, NFSD_FILE_PENDING, TASK_UNINTERRUPTIBLE);
 
 	/* Did construction of this file fail? */
 	if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
-		trace_nfsd_file_cons_err(rqstp, key.inode, may_flags, nf);
+		trace_nfsd_file_cons_err(rqstp, inode, may_flags, nf);
 		if (!open_retry) {
 			status = nfserr_jukebox;
-			goto out;
+			goto construction_err;
 		}
 		open_retry = false;
-		if (refcount_dec_and_test(&nf->nf_ref))
-			nfsd_file_free(nf);
 		goto retry;
 	}
-
 	this_cpu_inc(nfsd_file_cache_hits);
 
 	status = nfserrno(nfsd_open_break_lease(file_inode(nf->nf_file), may_flags));
+	if (status != nfs_ok) {
+		nfsd_file_put(nf);
+		nf = NULL;
+	}
+
 out:
 	if (status == nfs_ok) {
 		this_cpu_inc(nfsd_file_acquisitions);
 		nfsd_file_check_write_error(nf);
 		*pnf = nf;
-	} else {
-		if (refcount_dec_and_test(&nf->nf_ref))
-			nfsd_file_free(nf);
-		nf = NULL;
 	}
-
-out_status:
-	put_cred(key.cred);
-	trace_nfsd_file_acquire(rqstp, key.inode, may_flags, nf, status);
+	put_cred(cred);
+	trace_nfsd_file_acquire(rqstp, inode, may_flags, nf, status);
 	return status;
 
 open_file:
 	trace_nfsd_file_alloc(nf);
-	nf->nf_mark = nfsd_file_mark_find_or_create(nf, key.inode);
+	nf->nf_mark = nfsd_file_mark_find_or_create(nf, inode);
 	if (nf->nf_mark) {
 		if (file) {
 			get_file(file);
@@ -1171,13 +1098,16 @@ open_file:
 	 * If construction failed, or we raced with a call to unlink()
 	 * then unhash.
 	 */
-	if (status == nfs_ok && key.inode->i_nlink == 0)
-		status = nfserr_jukebox;
-	if (status != nfs_ok)
+	if (status != nfs_ok || inode->i_nlink == 0)
 		nfsd_file_unhash(nf);
-	clear_bit_unlock(NFSD_FILE_PENDING, &nf->nf_flags);
-	smp_mb__after_atomic();
-	wake_up_bit(&nf->nf_flags, NFSD_FILE_PENDING);
+	clear_and_wake_up_bit(NFSD_FILE_PENDING, &nf->nf_flags);
+	if (status == nfs_ok)
+		goto out;
+
+construction_err:
+	if (refcount_dec_and_test(&nf->nf_ref))
+		nfsd_file_free(nf);
+	nf = NULL;
 	goto out;
 }
 
@@ -1193,8 +1123,11 @@ open_file:
  * seconds after the final nfsd_file_put() in case the caller
  * wants to re-use it.
  *
- * Returns nfs_ok and sets @pnf on success; otherwise an nfsstat in
- * network byte order is returned.
+ * Return values:
+ *   %nfs_ok - @pnf points to an nfsd_file with its reference
+ *   count boosted.
+ *
+ * On error, an nfsstat value in network byte order is returned.
  */
 __be32
 nfsd_file_acquire_gc(struct svc_rqst *rqstp, struct svc_fh *fhp,
@@ -1214,8 +1147,11 @@ nfsd_file_acquire_gc(struct svc_rqst *rqstp, struct svc_fh *fhp,
  * but not garbage-collected. The object is unhashed after the
  * final nfsd_file_put().
  *
- * Returns nfs_ok and sets @pnf on success; otherwise an nfsstat in
- * network byte order is returned.
+ * Return values:
+ *   %nfs_ok - @pnf points to an nfsd_file with its reference
+ *   count boosted.
+ *
+ * On error, an nfsstat value in network byte order is returned.
  */
 __be32
 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
@@ -1236,8 +1172,11 @@ nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
  * and @file is non-NULL, use it to instantiate a new nfsd_file instead of
  * opening a new one.
  *
- * Returns nfs_ok and sets @pnf on success; otherwise an nfsstat in
- * network byte order is returned.
+ * Return values:
+ *   %nfs_ok - @pnf points to an nfsd_file with its reference
+ *   count boosted.
+ *
+ * On error, an nfsstat value in network byte order is returned.
  */
 __be32
 nfsd_file_acquire_opened(struct svc_rqst *rqstp, struct svc_fh *fhp,
@@ -1268,7 +1207,7 @@ int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 		lru = list_lru_count(&nfsd_file_lru);
 
 		rcu_read_lock();
-		ht = &nfsd_file_rhash_tbl;
+		ht = &nfsd_file_rhltable.ht;
 		count = atomic_read(&ht->nelems);
 		tbl = rht_dereference_rcu(ht->tbl, ht);
 		buckets = tbl->size;
@@ -1284,7 +1223,7 @@ int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
 		evictions += per_cpu(nfsd_file_evictions, i);
 	}
 
-	seq_printf(m, "total entries: %u\n", count);
+	seq_printf(m, "total inodes:  %u\n", count);
 	seq_printf(m, "hash buckets:  %u\n", buckets);
 	seq_printf(m, "lru entries:   %lu\n", lru);
 	seq_printf(m, "cache hits:    %lu\n", hits);
diff --git a/fs/nfsd/filecache.h b/fs/nfsd/filecache.h
index 41516a426..e54165a32 100644
--- a/fs/nfsd/filecache.h
+++ b/fs/nfsd/filecache.h
@@ -29,9 +29,8 @@ struct nfsd_file_mark {
  * never be dereferenced, only used for comparison.
  */
 struct nfsd_file {
-	struct rhash_head	nf_rhash;
-	struct list_head	nf_lru;
-	struct rcu_head		nf_rcu;
+	struct rhlist_head	nf_rlist;
+	void			*nf_inode;
 	struct file		*nf_file;
 	const struct cred	*nf_cred;
 	struct net		*nf_net;
@@ -40,10 +39,12 @@ struct nfsd_file {
 #define NFSD_FILE_REFERENCED	(2)
 #define NFSD_FILE_GC		(3)
 	unsigned long		nf_flags;
-	struct inode		*nf_inode;	/* don't deref */
 	refcount_t		nf_ref;
 	unsigned char		nf_may;
+
 	struct nfsd_file_mark	*nf_mark;
+	struct list_head	nf_lru;
+	struct rcu_head		nf_rcu;
 	ktime_t			nf_birthtime;
 };
 
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b9d694ec2..8d1595900 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -602,9 +602,7 @@ put_nfs4_file(struct nfs4_file *fi)
 static struct nfsd_file *
 __nfs4_get_fd(struct nfs4_file *f, int oflag)
 {
-	if (f->fi_fds[oflag])
-		return nfsd_file_get(f->fi_fds[oflag]);
-	return NULL;
+	return nfsd_file_get(f->fi_fds[oflag]);
 }
 
 static struct nfsd_file *
@@ -2891,12 +2889,9 @@ static void
 nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
 {
 	struct nfs4_client *clp = cb->cb_clp;
-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 
-	spin_lock(&nn->client_lock);
 	clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
-	put_client_renew_locked(clp);
-	spin_unlock(&nn->client_lock);
+	drop_client(clp);
 }
 
 static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
@@ -6233,7 +6228,7 @@ deleg_reaper(struct nfsd_net *nn)
 		list_add(&clp->cl_ra_cblist, &cblist);
 
 		/* release in nfsd4_cb_recall_any_release */
-		atomic_inc(&clp->cl_rpc_users);
+		kref_get(&clp->cl_nfsdfs.cl_ref);
 		set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
 		clp->cl_ra_time = ktime_get_boottime_seconds();
 	}
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 597f14a80..4ed9fef14 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2541,6 +2541,20 @@ static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
 	return p;
 }
 
+static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
+				    struct timespec64 *tv)
+{
+	__be32 *p;
+
+	p = xdr_reserve_space(xdr, XDR_UNIT * 3);
+	if (!p)
+		return nfserr_resource;
+
+	p = xdr_encode_hyper(p, (s64)tv->tv_sec);
+	*p = cpu_to_be32(tv->tv_nsec);
+	return nfs_ok;
+}
+
 /*
  * ctime (in NFSv4, time_metadata) is not writeable, and the client
  * doesn't really care what resolution could theoretically be stored by
@@ -3346,11 +3360,14 @@ out_acl:
 		p = xdr_encode_hyper(p, dummy64);
 	}
 	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
-		p = xdr_reserve_space(xdr, 12);
-		if (!p)
-			goto out_resource;
-		p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
-		*p++ = cpu_to_be32(stat.atime.tv_nsec);
+		status = nfsd4_encode_nfstime4(xdr, &stat.atime);
+		if (status)
+			goto out;
+	}
+	if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
+		status = nfsd4_encode_nfstime4(xdr, &stat.btime);
+		if (status)
+			goto out;
 	}
 	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
 		p = xdr_reserve_space(xdr, 12);
@@ -3359,25 +3376,14 @@ out_acl:
 		p = encode_time_delta(p, d_inode(dentry));
 	}
 	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
-		p = xdr_reserve_space(xdr, 12);
-		if (!p)
-			goto out_resource;
-		p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
-		*p++ = cpu_to_be32(stat.ctime.tv_nsec);
+		status = nfsd4_encode_nfstime4(xdr, &stat.ctime);
+		if (status)
+			goto out;
 	}
 	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
-		p = xdr_reserve_space(xdr, 12);
-		if (!p)
-			goto out_resource;
-		p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
-		*p++ = cpu_to_be32(stat.mtime.tv_nsec);
-	}
-	if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
-		p = xdr_reserve_space(xdr, 12);
-		if (!p)
-			goto out_resource;
-		p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
-		*p++ = cpu_to_be32(stat.btime.tv_nsec);
+		status = nfsd4_encode_nfstime4(xdr, &stat.mtime);
+		if (status)
+			goto out;
 	}
 	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
 		u64 ino = stat.ino;
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 4183819ea..84f26f281 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -842,7 +842,7 @@ DECLARE_EVENT_CLASS(nfsd_clid_class,
 		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
 		__field(unsigned long, flavor)
 		__array(unsigned char, verifier, NFS4_VERIFIER_SIZE)
-		__string_len(name, name, clp->cl_name.len)
+		__string_len(name, clp->cl_name.data, clp->cl_name.len)
 	),
 	TP_fast_assign(
 		__entry->cl_boot = clp->cl_clientid.cl_boot;