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nfsd: fix configuration of supported minor versions 

When the user turns off all minor versions of NFSv4, that should be
equivalent to turning off NFSv4 support, so a mount attempt using NFSv4
should get RPC_PROG_MISMATCH, not NFSERR_MINOR_VERS_MISMATCH.

Allow the user to use either '4.0' or '4' to enable or disable minor
version 0.  Other minor versions are still enabled or disabled using the
'4.x' format.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2017-02-22 18:35:32 -05:00 committed by J. Bruce Fields
parent 7259f1dfe7
commit d3635ff07e
2 changed files with 22 additions and 8 deletions
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16
fs/nfsd/nfsctl.c
View File

@ -561,6 +561,7 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
len = qword_get(&mesg, vers, size);
if (len <= 0) return -EINVAL;
do {
enum vers_op cmd;
sign = *vers;
if (sign == '+' || sign == '-')
num = simple_strtol((vers+1), &minorp, 0);
@ -571,21 +572,20 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
return -EINVAL;
if (kstrtouint(minorp+1, 0, &minor) < 0)
return -EINVAL;
if (nfsd_minorversion(minor, sign == '-' ?
NFSD_CLEAR : NFSD_SET) < 0)
return -EINVAL;
goto next;
}
} else
minor = 0;
cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
switch(num) {
case 2:
case 3:
case 4:
nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
nfsd_vers(num, cmd);
break;
case 4:
if (nfsd_minorversion(minor, cmd) >= 0)
break;
default:
return -EINVAL;
}
next:
vers += len + 1;
} while ((len = qword_get(&mesg, vers, size)) > 0);
/* If all get turned off, turn them back on, as

14
fs/nfsd/nfssvc.c
View File

@ -153,6 +153,18 @@ int nfsd_vers(int vers, enum vers_op change)
return 0;
}
static void
nfsd_adjust_nfsd_versions4(void)
{
unsigned i;
for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) {
if (nfsd_supported_minorversions[i])
return;
}
nfsd_vers(4, NFSD_CLEAR);
}
int nfsd_minorversion(u32 minorversion, enum vers_op change)
{
if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
@ -160,9 +172,11 @@ int nfsd_minorversion(u32 minorversion, enum vers_op change)
switch(change) {
case NFSD_SET:
nfsd_supported_minorversions[minorversion] = true;
nfsd_vers(4, NFSD_SET);
break;
case NFSD_CLEAR:
nfsd_supported_minorversions[minorversion] = false;
nfsd_adjust_nfsd_versions4();
break;
case NFSD_TEST:
return nfsd_supported_minorversions[minorversion];