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

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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
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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},

79
fs/nfsd/nfssvc.c
View File

@ -30,6 +30,7 @@
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/stats.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/syscall.h>
#include <linux/lockd/bind.h>
#include <linux/nfsacl.h>
@ -52,7 +53,7 @@
extern struct svc_program nfsd_program;
static void nfsd(struct svc_rqst *rqstp);
struct timeval nfssvc_boot;
static struct svc_serv *nfsd_serv;
struct svc_serv *nfsd_serv;
static atomic_t nfsd_busy;
static unsigned long nfsd_last_call;
static DEFINE_SPINLOCK(nfsd_call_lock);
@ -63,6 +64,31 @@ struct nfsd_list {
};
static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);
static struct svc_version * nfsd_version[] = {
[2] = &nfsd_version2,
#if defined(CONFIG_NFSD_V3)
[3] = &nfsd_version3,
#endif
#if defined(CONFIG_NFSD_V4)
[4] = &nfsd_version4,
#endif
};
#define NFSD_MINVERS 2
#define NFSD_NRVERS (sizeof(nfsd_version)/sizeof(nfsd_version[0]))
static struct svc_version *nfsd_versions[NFSD_NRVERS];
struct svc_program nfsd_program = {
.pg_prog = NFS_PROGRAM, /* program number */
.pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
.pg_vers = nfsd_versions, /* version table */
.pg_name = "nfsd", /* program name */
.pg_class = "nfsd", /* authentication class */
.pg_stats = &nfsd_svcstats, /* version table */
.pg_authenticate = &svc_set_client, /* export authentication */
};
/*
* Maximum number of nfsd processes
*/
@ -80,11 +106,12 @@ int
nfsd_svc(unsigned short port, int nrservs)
{
int error;
int none_left;
int none_left, found_one, i;
struct list_head *victim;
lock_kernel();
dprintk("nfsd: creating service\n");
dprintk("nfsd: creating service: vers 0x%x\n",
nfsd_versbits);
error = -EINVAL;
if (nrservs <= 0)
nrservs = 0;
@ -99,6 +126,27 @@ nfsd_svc(unsigned short port, int nrservs)
if (error<0)
goto out;
if (!nfsd_serv) {
/*
* Use the nfsd_ctlbits to define which
* versions that will be advertised.
* If nfsd_ctlbits doesn't list any version,
* export them all.
*/
found_one = 0;
for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
if (NFSCTL_VERISSET(nfsd_versbits, i)) {
nfsd_program.pg_vers[i] = nfsd_version[i];
found_one = 1;
} else
nfsd_program.pg_vers[i] = NULL;
}
if (!found_one) {
for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
nfsd_program.pg_vers[i] = nfsd_version[i];
}
atomic_set(&nfsd_busy, 0);
error = -ENOMEM;
nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
@ -389,28 +437,3 @@ static struct svc_stat nfsd_acl_svcstats = {
#else
#define nfsd_acl_program_p NULL
#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
extern struct svc_version nfsd_version2, nfsd_version3, nfsd_version4;
static struct svc_version * nfsd_version[] = {
[2] = &nfsd_version2,
#if defined(CONFIG_NFSD_V3)
[3] = &nfsd_version3,
#endif
#if defined(CONFIG_NFSD_V4)
[4] = &nfsd_version4,
#endif
};
#define NFSD_NRVERS (sizeof(nfsd_version)/sizeof(nfsd_version[0]))
struct svc_program nfsd_program = {
.pg_next = nfsd_acl_program_p,
.pg_prog = NFS_PROGRAM, /* program number */
.pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
.pg_vers = nfsd_version, /* version table */
.pg_name = "nfsd", /* program name */
.pg_class = "nfsd", /* authentication class */
.pg_stats = &nfsd_svcstats, /* version table */
.pg_authenticate = &svc_set_client, /* export authentication */
};

2
include/linux/nfsd/nfsd.h
View File

@ -60,7 +60,7 @@ typedef int (*nfsd_dirop_t)(struct inode *, struct dentry *, int, int);
extern struct svc_program nfsd_program;
extern struct svc_version nfsd_version2, nfsd_version3,
nfsd_version4;
extern struct svc_serv *nfsd_serv;
/*
* Function prototypes.
*/

17
include/linux/nfsd/syscall.h
View File

@ -39,6 +39,21 @@
#define NFSCTL_GETFD 7 /* get an fh by path (used by mountd) */
#define NFSCTL_GETFS 8 /* get an fh by path with max FH len */
/*
* Macros used to set version
*/
#define NFSCTL_VERSET(_cltbits, _v) ((_cltbits) |= (1 << (_v)))
#define NFSCTL_VERUNSET(_cltbits, _v) ((_cltbits) &= ~(1 << (_v)))
#define NFSCTL_VERISSET(_cltbits, _v) ((_cltbits) & (1 << (_v)))
#if defined(CONFIG_NFSD_V4)
#define NFSCTL_VERALL (0x1c /* 0b011100 */)
#elif defined(CONFIG_NFSD_V3)
#define NFSCTL_VERALL (0x0c /* 0b001100 */)
#else
#define NFSCTL_VERALL (0x04 /* 0b000100 */)
#endif
/* SVC */
struct nfsctl_svc {
unsigned short svc_port;
@ -120,6 +135,8 @@ extern int exp_delclient(struct nfsctl_client *ncp);
extern int exp_export(struct nfsctl_export *nxp);
extern int exp_unexport(struct nfsctl_export *nxp);
extern unsigned int nfsd_versbits;
#endif /* __KERNEL__ */
#endif /* NFSD_SYSCALL_H */