[7/9] sunrpc: add a new cache_detail operation for when a cache is flushed

Commit Message

Jeff Layton July 30, 2015, 1:52 p.m. UTC

When the exports table is changed, exportfs will usually write a new
time to the "flush" file in the nfsd.export cache procfile. This tells
the kernel to flush any entries that are older than that value.

This gives us a mechanism to tell whether an unexport might have
occurred. Add a new ->flush cache_detail operation that is called after
flushing the cache whenever someone writes to a "flush" file.

Signed-off-by: Jeff Layton <[e-mail]>
---
 include/linux/sunrpc/cache.h | 1 +
 net/sunrpc/cache.c           | 3 +++
 2 files changed, 4 insertions(+)

Patch

diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index 437ddb6c4aef..29033421aa0c 100644
--- a/include/linux/sunrpc/cache.h
+++ b/include/linux/sunrpc/cache.h
@@ -98,6 +98,7 @@  struct cache_detail {
 					      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);
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 2928afffbb81..19dc71ccc706 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1452,6 +1452,9 @@  static ssize_t write_flush(struct file *file, const char __user *buf,
 	cd->nextcheck = seconds_since_boot();
 	cache_flush();
 
+	if (cd->flush)
+		cd->flush();
+
 	*ppos += count;
 	return count;
 }