nfsd: cleanup setting of default max_block_size

Move calculation of the default into a helper function.

Get rid of an unused variable "err" while we're there.

Thanks to Mi Jinlong for catching an arithmetic error in a previous
version.

Cc: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 24 insertions, 20 deletions

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index eda7d7e55e0..e9eb408ae2a 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -307,33 +307,37 @@ static void set_max_drc(void)
         dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
 }
 
-int nfsd_create_serv(void)
+static int nfsd_get_default_max_blksize(void)
 {
-        int err = 0;
+        struct sysinfo i;
+        unsigned long long target;
+        unsigned long ret;
+
+        si_meminfo(&i);
+        target = i.totalram << PAGE_SHIFT;
+        /*
+         * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
+         * machines, but only uses 32K on 128M machines.  Bottom out at
+         * 8K on 32M and smaller.  Of course, this is only a default.
+         */
+        target >>= 12;
+
+        ret = NFSSVC_MAXBLKSIZE;
+        while (ret > target && ret >= 8*1024*2)
+                ret /= 2;
+        return ret;
+}
 
+int nfsd_create_serv(void)
+{
         WARN_ON(!mutex_is_locked(&nfsd_mutex));
         if (nfsd_serv) {
                 svc_get(nfsd_serv);
                 return 0;
         }
-        if (nfsd_max_blksize == 0) {
-                /* choose a suitable default */
-                struct sysinfo i;
-                si_meminfo(&i);
-                /* Aim for 1/4096 of memory per thread
-                 * This gives 1MB on 4Gig machines
-                 * But only uses 32K on 128M machines.
-                 * Bottom out at 8K on 32M and smaller.
-                 * Of course, this is only a default.
-                 */
-                nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
-                i.totalram <<= PAGE_SHIFT - 12;
-                while (nfsd_max_blksize > i.totalram &&
-                       nfsd_max_blksize >= 8*1024*2)
-                        nfsd_max_blksize /= 2;
-        }
+        if (nfsd_max_blksize == 0)
+                nfsd_max_blksize = nfsd_get_default_max_blksize();
         nfsd_reset_versions();
-
         nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
                                       nfsd_last_thread, nfsd, THIS_MODULE);
         if (nfsd_serv == NULL)
@@ -341,7 +345,7 @@ int nfsd_create_serv(void)
 
         set_max_drc();
         do_gettimeofday(&nfssvc_boot);          /* record boot time */
-        return err;
+        return 0;
 }
 
 int nfsd_nrpools(void)