lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] knfsd: Allow run-time selection of NFS versions to export

Browse Source 
Provide a file in the NFSD filesystem that allows setting and querying of
which version of NFS are being exported.  Changes are only allowed while no
server is running.

Signed-off-by: Steve Dickson <steved@redhat.com>
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
2005-11-07 01:00:25 -08:00
committed by Linus Torvalds
parent 7390022d69
commit 70c3b76c28
4 changed files with 151 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
fs/nfsd/nfsctl.c
View File

@ -23,6 +23,7 @@
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/nfs.h>
#include <linux/nfsd_idmap.h>
@ -35,6 +36,8 @@
#include <asm/uaccess.h>
unsigned int nfsd_versbits = ~0;
/*
* We have a single directory with 9 nodes in it.
*/
@ -50,8 +53,15 @@ enum {
NFSD_List,
NFSD_Fh,
NFSD_Threads,
NFSD_Versions,
/*
* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
*/
#ifdef CONFIG_NFSD_V4
NFSD_Leasetime,
NFSD_RecoveryDir,
#endif
};
/*
@ -66,8 +76,11 @@ static ssize_t write_getfd(struct file *file, char *buf, size_t size);
static ssize_t write_getfs(struct file *file, char *buf, size_t size);
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Svc] = write_svc,
@ -79,8 +92,11 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Getfs] = write_getfs,
[NFSD_Fh] = write_filehandle,
[NFSD_Threads] = write_threads,
[NFSD_Versions] = write_versions,
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = write_leasetime,
[NFSD_RecoveryDir] = write_recoverydir,
#endif
};
static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
@ -343,6 +359,70 @@ static ssize_t write_threads(struct file *file, char *buf, size_t size)
return strlen(buf);
}
static ssize_t write_versions(struct file *file, char *buf, size_t size)
{
/*
* Format:
* [-/+]vers [-/+]vers ...
*/
char *mesg = buf;
char *vers, sign;
int len, num;
ssize_t tlen = 0;
char *sep;
if (size>0) {
if (nfsd_serv)
return -EBUSY;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
vers = mesg;
len = qword_get(&mesg, vers, size);
if (len <= 0) return -EINVAL;
do {
sign = *vers;
if (sign == '+' || sign == '-')
num = simple_strtol((vers+1), NULL, 0);
else
num = simple_strtol(vers, NULL, 0);
switch(num) {
case 2:
case 3:
case 4:
if (sign != '-')
NFSCTL_VERSET(nfsd_versbits, num);
else
NFSCTL_VERUNSET(nfsd_versbits, num);
break;
default:
return -EINVAL;
}
vers += len + 1;
tlen += len;
} while ((len = qword_get(&mesg, vers, size)) > 0);
/* 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;
}
/* Now write current state into reply buffer */
len = 0;
sep = "";
for (num=2 ; num <= 4 ; num++)
if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
len += sprintf(buf+len, "%s%c%d", sep,
NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
num);
sep = " ";
}
len += sprintf(buf+len, "\n");
return len;
}
#ifdef CONFIG_NFSD_V4
extern time_t nfs4_leasetime(void);
static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
@ -384,6 +464,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
status = nfs4_reset_recoverydir(recdir);
return strlen(buf);
}
#endif
/*----------------------------------------------------------------------------*/
/*
@ -403,6 +484,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},