nfsd: fix /proc/net/rpc/nfsd.export/content display

Note with "first" always 0, and "lastflags" initially 0, we always dump
a spurious set of 0 flags at the start, among other problems.

Fix.  And attempt to make the code a little more obvious.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index a3c7d0c..067e2e6 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1470,25 +1470,43 @@ static void show_secinfo_flags(struct seq_file *m, int flags)
        show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
 }
 
+static bool secinfo_flags_equal(int f, int g)
+{
+       f &= NFSEXP_SECINFO_FLAGS;
+       g &= NFSEXP_SECINFO_FLAGS;
+       return f == g;
+}
+
+static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
+{
+       int flags;
+
+       flags = (*fp)->flags;
+       seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
+       (*fp)++;
+       while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
+               seq_printf(m, ":%d", (*fp)->pseudoflavor);
+               (*fp)++;
+       }
+       return flags;
+}
+
 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
 {
        struct exp_flavor_info *f;
        struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
-       int lastflags = 0, first = 0;
+       int flags;
 
        if (exp->ex_nflavors == 0)
                return;
-       for (f = exp->ex_flavors; f < end; f++) {
-               if (first || f->flags != lastflags) {
-                       if (!first)
-                               show_secinfo_flags(m, lastflags);
-                       seq_printf(m, ",sec=%d", f->pseudoflavor);
-                       lastflags = f->flags;
-               } else {
-                       seq_printf(m, ":%d", f->pseudoflavor);
-               }
+       f = exp->ex_flavors;
+       flags = show_secinfo_run(m, &f, end);
+       if (!secinfo_flags_equal(flags, exp->ex_flags))
+               show_secinfo_flags(m, flags);
+       while (f != end) {
+               flags = show_secinfo_run(m, &f, end);
+               show_secinfo_flags(m, flags);
        }
-       show_secinfo_flags(m, lastflags);
 }
 
 static void exp_flags(struct seq_file *m, int flag, int fsid,