cifs: fix actimeo=0 corner case when cifs_i->time == jiffies

actimeo=0 is supposed to be a special case that ensures that inode
attributes are always refetched from the server instead of trusting the
cache. The cifs code however uses time_in_range() to determine whether
the attributes have timed out. In the case where cifs_i->time equals
jiffies, this leads to the cifs code not refetching the inode attributes
when it should.

Fix this by explicitly testing for actimeo=0, and handling it as a
special case.

Reported-and-tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index aadc2b68678b..a22d667f1069 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1737,6 +1737,9 @@ cifs_inode_needs_reval(struct inode *inode)
         if (cifs_i->time == 0)
                 return true;
 
+        if (!cifs_sb->actimeo)
+                return true;
+
         if (!time_in_range(jiffies, cifs_i->time,
                                 cifs_i->time + cifs_sb->actimeo))
                 return true;