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authorBenny Halevy2009-04-03 08:28:59 +0300
committerJ. Bruce Fields2009-04-03 17:41:21 -0700
commit8daf220a6a83c47b9648c28bb819c14c60bad7f9 (patch)
treee762cf2c8f0b31dac96989ac14c4cc8756e1af1d /fs
parent84459a1162801fb84734e5f9e6dc5194f791d69b (diff)
nfsd41: control nfsv4.1 svc via /proc/fs/nfsd/versions
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4proc.c2
-rw-r--r--fs/nfsd/nfsctl.c26
-rw-r--r--fs/nfsd/nfssvc.c24
3 files changed, 48 insertions, 4 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index db208dd8fdca..52bb14debb30 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -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)) {
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 4adebb6312c4..a9b8c75bf0bf 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -792,8 +792,9 @@ out_free:
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;
}
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index b53a098e97a4..e9d57734a348 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -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
*/