Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index 40d2822..f860372 100644
--- a/include/linux/sunrpc/cache.h
+++ b/include/linux/sunrpc/cache.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* include/linux/sunrpc/cache.h
*
@@ -5,9 +6,6 @@
* used by sunrpc clients and servers.
*
* Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
- *
- * Released under terms in GPL version 2. See COPYING.
- *
*/
#ifndef _LINUX_SUNRPC_CACHE_H_
@@ -67,7 +65,7 @@
struct module * owner;
int hash_size;
struct hlist_head * hash_table;
- rwlock_t hash_lock;
+ spinlock_t hash_lock;
char *name;
void (*cache_put)(struct kref *);
@@ -89,6 +87,7 @@
int has_died);
struct cache_head * (*alloc)(void);
+ void (*flush)(void);
int (*match)(struct cache_head *orig, struct cache_head *new);
void (*init)(struct cache_head *orig, struct cache_head *new);
void (*update)(struct cache_head *orig, struct cache_head *new);
@@ -109,9 +108,9 @@
/* fields for communication over channel */
struct list_head queue;
- atomic_t readers; /* how many time is /chennel open */
- time_t last_close; /* if no readers, when did last close */
- time_t last_warn; /* when we last warned about no readers */
+ atomic_t writers; /* how many time is /channel open */
+ time_t last_close; /* if no writers, when did last close */
+ time_t last_warn; /* when we last warned about no writers */
union {
struct proc_dir_entry *procfs;
@@ -168,8 +167,8 @@
extern const struct file_operations cache_flush_operations_pipefs;
extern struct cache_head *
-sunrpc_cache_lookup(struct cache_detail *detail,
- struct cache_head *key, int hash);
+sunrpc_cache_lookup_rcu(struct cache_detail *detail,
+ struct cache_head *key, int hash);
extern struct cache_head *
sunrpc_cache_update(struct cache_detail *detail,
struct cache_head *new, struct cache_head *old, int hash);
@@ -186,6 +185,12 @@
return h;
}
+static inline struct cache_head *cache_get_rcu(struct cache_head *h)
+{
+ if (kref_get_unless_zero(&h->ref))
+ return h;
+ return NULL;
+}
static inline void cache_put(struct cache_head *h, struct cache_detail *cd)
{
@@ -224,9 +229,9 @@
extern void sunrpc_cache_unhash(struct cache_detail *, struct cache_head *);
/* Must store cache_detail in seq_file->private if using next three functions */
-extern void *cache_seq_start(struct seq_file *file, loff_t *pos);
-extern void *cache_seq_next(struct seq_file *file, void *p, loff_t *pos);
-extern void cache_seq_stop(struct seq_file *file, void *p);
+extern void *cache_seq_start_rcu(struct seq_file *file, loff_t *pos);
+extern void *cache_seq_next_rcu(struct seq_file *file, void *p, loff_t *pos);
+extern void cache_seq_stop_rcu(struct seq_file *file, void *p);
extern void qword_add(char **bpp, int *lp, char *str);
extern void qword_addhex(char **bpp, int *lp, char *buf, int blen);