ceph: Use pseudo-random numbers to choose mds

We don't need to use up entropy to choose an mds,
so use prandom_u32() to get a pseudo-random number.

Also, we don't need to choose a random mds if only
one mds is available, so add special casing for the
common case.

Fixes http://tracker.ceph.com/issues/3579

Signed-off-by: Sam Lang <sam.lang@inktank.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 0d3c9240c61b..9278dec9e940 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -20,7 +20,10 @@ int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
 {
         int n = 0;
         int i;
-        char r;
+
+        /* special case for one mds */
+        if (1 == m->m_max_mds && m->m_info[0].state > 0)
+                return 0;
 
         /* count */
         for (i = 0; i < m->m_max_mds; i++)
@@ -30,8 +33,7 @@ int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
                 return -1;
 
         /* pick */
-        get_random_bytes(&r, 1);
-        n = r % n;
+        n = prandom_u32() % n;
         i = 0;
         for (i = 0; n > 0; i++, n--)
                 while (m->m_info[i].state <= 0)