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authorJeff Layton <jeff.layton@primarydata.com>2019-08-18 21:18:44 +0300
committerJ. Bruce Fields <bfields@redhat.com>2019-08-19 18:00:39 +0300
commitf69d6d8eef7807f8d937b81da24bebd2e926e4d2 (patch)
tree32597d19a96925f26e143ec5fff212d0e89e3e2b
parent4866073e6ddf03066c925d3237903d7f4ca68982 (diff)
downloadlinux-f69d6d8eef7807f8d937b81da24bebd2e926e4d2.tar.xz
sunrpc: add a new cache_detail operation for when a cache is flushed
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> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
-rw-r--r--include/linux/sunrpc/cache.h1
-rw-r--r--net/sunrpc/cache.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index f7d086b77a21..f8603724fbee 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 a6a6190ad37a..a349094f6fb7 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1524,6 +1524,9 @@ static ssize_t write_flush(struct file *file, const char __user *buf,
cd->nextcheck = now;
cache_flush();
+ if (cd->flush)
+ cd->flush();
+
*ppos += count;
return count;
}