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nfsd41: control nfsv4.1 svc via /proc/fs/nfsd/versions

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Support enabling and disabling nfsv4.1 via /proc/fs/nfsd/versions
by writing the strings "+4.1" or "-4.1" correspondingly.

Use user mode nfs-utils (rpc.nfsd option) to enable.
This will allow us to get rid of CONFIG_NFSD_V4_1

[nfsd41: disable support for minorversion by default]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Benny Halevy 2009-04-03 08:28:59 +03:00 committed by J. Bruce Fields
parent 84459a1162
commit 8daf220a6a
4 changed files with 50 additions and 4 deletions
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2
fs/nfsd/nfs4proc.c
View File

@ -921,7 +921,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
* According to RFC3010, this takes precedence over all other errors.
*/
status = nfserr_minor_vers_mismatch;
if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
if (args->minorversion > nfsd_supported_minorversion)
goto out;
if (!nfs41_op_ordering_ok(args)) {

26
fs/nfsd/nfsctl.c
View File

@ -792,8 +792,9 @@ static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
static ssize_t __write_versions(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
char *vers, sign;
char *vers, *minorp, sign;
int len, num;
unsigned minor;
ssize_t tlen = 0;
char *sep;
@ -814,9 +815,20 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
do {
sign = *vers;
if (sign == '+' || sign == '-')
num = simple_strtol((vers+1), NULL, 0);
num = simple_strtol((vers+1), &minorp, 0);
else
num = simple_strtol(vers, NULL, 0);
num = simple_strtol(vers, &minorp, 0);
if (*minorp == '.') {
if (num < 4)
return -EINVAL;
minor = simple_strtoul(minorp+1, NULL, 0);
if (minor == 0)
return -EINVAL;
if (nfsd_minorversion(minor, sign == '-' ?
NFSD_CLEAR : NFSD_SET) < 0)
return -EINVAL;
goto next;
}
switch(num) {
case 2:
case 3:
@ -826,6 +838,7 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
default:
return -EINVAL;
}
next:
vers += len + 1;
tlen += len;
} while ((len = qword_get(&mesg, vers, size)) > 0);
@ -844,6 +857,13 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
num);
sep = " ";
}
if (nfsd_vers(4, NFSD_AVAIL))
for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; minor++)
len += sprintf(buf+len, " %c4.%u",
(nfsd_vers(4, NFSD_TEST) &&
nfsd_minorversion(minor, NFSD_TEST)) ?
'+' : '-',
minor);
len += sprintf(buf+len, "\n");
return len;
}

24
fs/nfsd/nfssvc.c
View File

@ -121,6 +121,8 @@ struct svc_program nfsd_program = {
};
u32 nfsd_supported_minorversion;
int nfsd_vers(int vers, enum vers_op change)
{
if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
@ -147,6 +149,28 @@ int nfsd_vers(int vers, enum vers_op change)
}
return 0;
}
int nfsd_minorversion(u32 minorversion, enum vers_op change)
{
if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
return -1;
switch(change) {
case NFSD_SET:
nfsd_supported_minorversion = minorversion;
break;
case NFSD_CLEAR:
if (minorversion == 0)
return -1;
nfsd_supported_minorversion = minorversion - 1;
break;
case NFSD_TEST:
return minorversion <= nfsd_supported_minorversion;
case NFSD_AVAIL:
return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
}
return 0;
}
/*
* Maximum number of nfsd processes
*/

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

@ -53,6 +53,7 @@ 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 u32 nfsd_supported_minorversion;
extern struct mutex nfsd_mutex;
extern struct svc_serv *nfsd_serv;
@ -149,6 +150,7 @@ int nfsd_set_posix_acl(struct svc_fh *, int, struct posix_acl *);
enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
int nfsd_vers(int vers, enum vers_op change);
int nfsd_minorversion(u32 minorversion, enum vers_op change);
void nfsd_reset_versions(void);
int nfsd_create_serv(void);