[PATCH] knfsd: remove nfsd_versbits as intermediate storage for desired versions

We have an array 'nfsd_version' which lists the available versions of nfsd,
and 'nfsd_versions' (poor choice there :-() which lists the currently active
versions.

Then we have a bitmap - nfsd_versbits which says which versions are wanted.
The bits in this bitset cause content to be copied from nfsd_version to
nfsd_versions when nfsd starts.

This patch removes nfsd_versbits and moves information directly from
nfsd_version to nfsd_versions when requests for version changes arrive.

Note that this doesn't make it possible to change versions while the server is
running.  This is because serv->sv_xdrsize is calculated when a service is
created, and used when threads are created, and xdrsize depends on the active
versions.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 10 deletions

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7046ac9cf97f..d6881774ea57 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -35,8 +35,6 @@
 
 #include <asm/uaccess.h>
 
-unsigned int nfsd_versbits = ~0;
-
 /*
  *      We have a single directory with 9 nodes in it.
  */
@@ -372,6 +370,10 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
 
         if (size>0) {
                 if (nfsd_serv)
+                        /* Cannot change versions without updating
+                         * nfsd_serv->sv_xdrsize, and reallocing
+                         * rq_argp and rq_resp
+                         */
                         return -EBUSY;
                 if (buf[size-1] != '\n')
                         return -EINVAL;
@@ -390,10 +392,7 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
                         case 2:
                         case 3:
                         case 4:
-                                if (sign != '-')
-                                        NFSCTL_VERSET(nfsd_versbits, num);
-                                else
-                                        NFSCTL_VERUNSET(nfsd_versbits, num);
+                                nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
                                 break;
                         default:
                                 return -EINVAL;
@@ -404,16 +403,15 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
                 /* If all get turned off, turn them back on, as
                  * having no versions is BAD
                  */
-                if ((nfsd_versbits & NFSCTL_VERALL)==0)
-                        nfsd_versbits = NFSCTL_VERALL;
+                nfsd_reset_versions();
         }
         /* Now write current state into reply buffer */
         len = 0;
         sep = "";
         for (num=2 ; num <= 4 ; num++)
-                if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
+                if (nfsd_vers(num, NFSD_AVAIL)) {
                         len += sprintf(buf+len, "%s%c%d", sep,
-                                       NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
+                                       nfsd_vers(num, NFSD_TEST)?'+':'-',
                                        num);
                         sep = " ";
                 }