From: Jeff Layton Date: Sun, 18 Aug 2019 18:18:44 +0000 (-0400) Subject: sunrpc: add a new cache_detail operation for when a cache is flushed X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f69d6d8eef7807f8d937b81da24bebd2e926e4d2;p=linux.git 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 Signed-off-by: Trond Myklebust Signed-off-by: Trond Myklebust Signed-off-by: J. Bruce Fields --- diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index f7d086b77a21a..f8603724fbee2 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 a6a6190ad37a9..a349094f6fb7d 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; }