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

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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>
This commit is contained in:
NeilBrown
2006-10-02 02:17:46 -07:00
committed by Linus Torvalds
parent 24e36663c3
commit 6658d3a7bb
4 changed files with 62 additions and 70 deletions
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18
fs/nfsd/nfsctl.c
View File

@@ -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 = " ";
}