sunrpc: extract some common sunrpc_cache code from nfsd

Rather can duplicating this idiom twice, put it in an inline function.
This reduces the usage of 'expiry_time' out side the sunrpc/cache.c
code and thus the impact of a change that is about to be made to that
field.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 9 insertions, 6 deletions

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index c2a4f71d87dd..e56827b88fd2 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -935,10 +935,9 @@ static void exp_fsid_unhash(struct svc_export *exp)
 
         ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
         if (!IS_ERR(ek)) {
-                ek->h.expiry_time = get_seconds()-1;
+                sunrpc_invalidate(&ek->h, &svc_expkey_cache);
                 cache_put(&ek->h, &svc_expkey_cache);
         }
-        svc_expkey_cache.nextcheck = get_seconds();
 }
 
 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
@@ -973,10 +972,9 @@ static void exp_unhash(struct svc_export *exp)
 
         ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
         if (!IS_ERR(ek)) {
-                ek->h.expiry_time = get_seconds()-1;
+                sunrpc_invalidate(&ek->h, &svc_expkey_cache);
                 cache_put(&ek->h, &svc_expkey_cache);
         }
-        svc_expkey_cache.nextcheck = get_seconds();
 }
         
 /*
@@ -1097,8 +1095,7 @@ out:
 static void
 exp_do_unexport(svc_export *unexp)
 {
-        unexp->h.expiry_time = get_seconds()-1;
-        svc_export_cache.nextcheck = get_seconds();
+        sunrpc_invalidate(&unexp->h, &svc_export_cache);
         exp_unhash(unexp);
         exp_fsid_unhash(unexp);
 }
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index 7bf3e84b92f4..0e1febf4e5bc 100644
--- a/include/linux/sunrpc/cache.h
+++ b/include/linux/sunrpc/cache.h
@@ -228,4 +228,10 @@ static inline time_t get_expiry(char **bpp)
         return rv;
 }
 
+static inline void sunrpc_invalidate(struct cache_head *h,
+                                     struct cache_detail *detail)
+{
+        h->expiry_time = get_seconds() - 1;
+        detail->nextcheck = get_seconds();
+}
 #endif /*  _LINUX_SUNRPC_CACHE_H_ */