[v2,01/16] sunrpc: add a new cache_detail operation for when a cache is flushed
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Message ID 20190818181859.8458-2-trond.myklebust@hammerspace.com
State New
Headers show
  • Cache open file descriptors in knfsd
Related show

Commit Message

Trond Myklebust Aug. 18, 2019, 6:18 p.m. UTC
From: Jeff Layton <jeff.layton@primarydata.com>

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 <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
 include/linux/sunrpc/cache.h | 1 +
 net/sunrpc/cache.c           | 3 +++
 2 files changed, 4 insertions(+)

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diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index c7f38e897174..dfa3ab97564a 100644
--- a/include/linux/sunrpc/cache.h
+++ b/include/linux/sunrpc/cache.h
@@ -87,6 +87,7 @@  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 6f1528f271ee..f6ff8be07688 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1520,6 +1520,9 @@  static ssize_t write_flush(struct file *file, const char __user *buf,
 	cd->nextcheck = now;
+	if (cd->flush)
+		cd->flush();
 	*ppos += count;
 	return count;