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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/sunrpc/cache.h
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@@ -1,3 +1,4 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * include/linux/sunrpc/cache.h
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  *
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@@ -5,9 +6,6 @@
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  * used by sunrpc clients and servers.
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  *
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  * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
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- *
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- * Released under terms in GPL version 2.  See COPYING.
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- *
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  */
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 #ifndef _LINUX_SUNRPC_CACHE_H_
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@@ -16,6 +14,7 @@
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 #include <linux/kref.h>
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 #include <linux/slab.h>
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 #include <linux/atomic.h>
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+#include <linux/kstrtox.h>
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 #include <linux/proc_fs.h>
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19
 
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 /*
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@@ -47,8 +46,9 @@
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  */
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 struct cache_head {
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 	struct hlist_node	cache_list;
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-	time_t		expiry_time;	/* After time time, don't use the data */
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-	time_t		last_refresh;   /* If CACHE_PENDING, this is when upcall was
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+	time64_t	expiry_time;	/* After time expiry_time, don't use
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+					 * the data */
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+	time64_t	last_refresh;   /* If CACHE_PENDING, this is when upcall was
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 					 * sent, else this is when update was
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 					 * received, though it is alway set to
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 					 * be *after* ->flush_time.
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@@ -67,7 +67,7 @@
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 	struct module *		owner;
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 	int			hash_size;
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 	struct hlist_head *	hash_table;
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-	rwlock_t		hash_lock;
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+	spinlock_t		hash_lock;
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 	char			*name;
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 	void			(*cache_put)(struct kref *);
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@@ -89,6 +89,7 @@
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 					      int has_died);
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 	struct cache_head *	(*alloc)(void);
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+	void			(*flush)(void);
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 	int			(*match)(struct cache_head *orig, struct cache_head *new);
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 	void			(*init)(struct cache_head *orig, struct cache_head *new);
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 	void			(*update)(struct cache_head *orig, struct cache_head *new);
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@@ -96,22 +97,22 @@
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 	/* fields below this comment are for internal use
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 	 * and should not be touched by cache owners
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 	 */
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-	time_t			flush_time;		/* flush all cache items with
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+	time64_t		flush_time;		/* flush all cache items with
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 							 * last_refresh at or earlier
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 							 * than this.  last_refresh
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 							 * is never set at or earlier
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 							 * than this.
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 							 */
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 	struct list_head	others;
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-	time_t			nextcheck;
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+	time64_t		nextcheck;
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 	int			entries;
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 	/* fields for communication over channel */
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 	struct list_head	queue;
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-	atomic_t		readers;		/* how many time is /chennel open */
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-	time_t			last_close;		/* if no readers, when did last close */
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-	time_t			last_warn;		/* when we last warned about no readers */
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+	atomic_t		writers;		/* how many time is /channel open */
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+	time64_t		last_close;		/* if no writers, when did last close */
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+	time64_t		last_warn;		/* when we last warned about no writers */
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 	union {
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 		struct proc_dir_entry	*procfs;
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@@ -148,18 +149,22 @@
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  * timestamps kept in the cache are expressed in seconds
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  * since boot.  This is the best for measuring differences in
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  * real time.
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+ * This reimplemnts ktime_get_boottime_seconds() in a slightly
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+ * faster but less accurate way. When we end up converting
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+ * back to wallclock (CLOCK_REALTIME), that error often
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+ * cancels out during the reverse operation.
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  */
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-static inline time_t seconds_since_boot(void)
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+static inline time64_t seconds_since_boot(void)
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 {
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-	struct timespec boot;
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-	getboottime(&boot);
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-	return get_seconds() - boot.tv_sec;
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+	struct timespec64 boot;
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+	getboottime64(&boot);
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+	return ktime_get_real_seconds() - boot.tv_sec;
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 }
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-static inline time_t convert_to_wallclock(time_t sinceboot)
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+static inline time64_t convert_to_wallclock(time64_t sinceboot)
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 {
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-	struct timespec boot;
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-	getboottime(&boot);
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+	struct timespec64 boot;
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+	getboottime64(&boot);
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 	return boot.tv_sec + sinceboot;
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 }
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@@ -168,14 +173,17 @@
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 extern const struct file_operations cache_flush_operations_pipefs;
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 extern struct cache_head *
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-sunrpc_cache_lookup(struct cache_detail *detail,
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-		    struct cache_head *key, int hash);
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+sunrpc_cache_lookup_rcu(struct cache_detail *detail,
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+			struct cache_head *key, int hash);
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 extern struct cache_head *
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 sunrpc_cache_update(struct cache_detail *detail,
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 		    struct cache_head *new, struct cache_head *old, int hash);
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 extern int
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 sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h);
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+extern int
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+sunrpc_cache_pipe_upcall_timeout(struct cache_detail *detail,
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+				 struct cache_head *h);
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 extern void cache_clean_deferred(void *owner);
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@@ -186,6 +194,12 @@
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 	return h;
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 }
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+static inline struct cache_head  *cache_get_rcu(struct cache_head *h)
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+{
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+	if (kref_get_unless_zero(&h->ref))
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+		return h;
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+	return NULL;
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+}
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 static inline void cache_put(struct cache_head *h, struct cache_detail *cd)
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 {
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@@ -197,11 +211,11 @@
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 static inline bool cache_is_expired(struct cache_detail *detail, struct cache_head *h)
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 {
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+	if (h->expiry_time < seconds_since_boot())
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+		return true;
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 	if (!test_bit(CACHE_VALID, &h->flags))
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 		return false;
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-
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-	return  (h->expiry_time < seconds_since_boot()) ||
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-		(detail->flush_time >= h->last_refresh);
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+	return detail->flush_time >= h->last_refresh;
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 }
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 extern int cache_check(struct cache_detail *detail,
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@@ -224,9 +238,9 @@
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 extern void sunrpc_cache_unhash(struct cache_detail *, struct cache_head *);
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 /* Must store cache_detail in seq_file->private if using next three functions */
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-extern void *cache_seq_start(struct seq_file *file, loff_t *pos);
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-extern void *cache_seq_next(struct seq_file *file, void *p, loff_t *pos);
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-extern void cache_seq_stop(struct seq_file *file, void *p);
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+extern void *cache_seq_start_rcu(struct seq_file *file, loff_t *pos);
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+extern void *cache_seq_next_rcu(struct seq_file *file, void *p, loff_t *pos);
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+extern void cache_seq_stop_rcu(struct seq_file *file, void *p);
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 extern void qword_add(char **bpp, int *lp, char *str);
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 extern void qword_addhex(char **bpp, int *lp, char *buf, int blen);
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@@ -268,7 +282,7 @@
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 	return 0;
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 }
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-static inline int get_time(char **bpp, time_t *time)
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+static inline int get_time(char **bpp, time64_t *time)
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 {
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 	char buf[50];
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 	long long ll;
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@@ -282,20 +296,20 @@
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 	if (kstrtoll(buf, 0, &ll))
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 		return -EINVAL;
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-	*time = (time_t)ll;
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+	*time = ll;
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 	return 0;
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 }
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-static inline time_t get_expiry(char **bpp)
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+static inline time64_t get_expiry(char **bpp)
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 {
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-	time_t rv;
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-	struct timespec boot;
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+	time64_t rv;
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+	struct timespec64 boot;
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 	if (get_time(bpp, &rv))
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 		return 0;
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 	if (rv < 0)
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 		return 0;
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-	getboottime(&boot);
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+	getboottime64(&boot);
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 	return rv - boot.tv_sec;
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 }
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