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Fix "snapdev" property issues

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When inheriting the "snapdev" property to we don't always call
zfs_prop_set_special(): this prevents device nodes from being created in
certain situations. Because "snapdev" is the only *special* property
that is also inheritable we need to call zfs_prop_set_special() even
when we're not reverting it to the received value ('zfs inherit -S').

Additionally, fix a NULL pointer dereference accidentally introduced in
5559ba0 that can be triggered when setting the "snapdev" property to
the value "hidden" twice.

Finally, add a new test case "zvol_misc_snapdev" to the ZFS Test Suite.

Reviewed by: Boris Protopopov <bprotopopov@hotmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6131 
Closes #6175 
Closes #6176
This commit is contained in:
LOLi
2017-06-02 16:17:00 +02:00
committed by Brian Behlendorf
parent b870c4b5d7
commit 92aceb2a7e
5 changed files with 248 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zfs_ioctl.c
+48 -49
View File
@@ -2761,54 +2761,12 @@ zfs_ioc_inherit_prop(zfs_cmd_t *zc)
zprop_source_t source = (received
? ZPROP_SRC_NONE /* revert to received value, if any */
: ZPROP_SRC_INHERITED); /* explicitly inherit */
nvlist_t *dummy;
nvpair_t *pair;
zprop_type_t type;
int err;
if (received) {
nvlist_t *dummy;
nvpair_t *pair;
zprop_type_t type;
int err;
/*
* zfs_prop_set_special() expects properties in the form of an
* nvpair with type info.
*/
if (prop == ZPROP_INVAL) {
if (!zfs_prop_user(propname))
return (SET_ERROR(EINVAL));
type = PROP_TYPE_STRING;
} else if (prop == ZFS_PROP_VOLSIZE ||
prop == ZFS_PROP_VERSION) {
return (SET_ERROR(EINVAL));
} else {
type = zfs_prop_get_type(prop);
}
VERIFY(nvlist_alloc(&dummy, NV_UNIQUE_NAME, KM_SLEEP) == 0);
switch (type) {
case PROP_TYPE_STRING:
VERIFY(0 == nvlist_add_string(dummy, propname, ""));
break;
case PROP_TYPE_NUMBER:
case PROP_TYPE_INDEX:
VERIFY(0 == nvlist_add_uint64(dummy, propname, 0));
break;
default:
nvlist_free(dummy);
return (SET_ERROR(EINVAL));
}
pair = nvlist_next_nvpair(dummy, NULL);
if (pair == NULL) {
nvlist_free(dummy);
return (SET_ERROR(EINVAL));
}
err = zfs_prop_set_special(zc->zc_name, source, pair);
nvlist_free(dummy);
if (err != -1)
return (err); /* special property already handled */
} else {
if (!received) {
/*
* Only check this in the non-received case. We want to allow
* 'inherit -S' to revert non-inheritable properties like quota
@@ -2819,8 +2777,49 @@ zfs_ioc_inherit_prop(zfs_cmd_t *zc)
return (SET_ERROR(EINVAL));
}
/* property name has been validated by zfs_secpolicy_inherit_prop() */
return (dsl_prop_inherit(zc->zc_name, zc->zc_value, source));
if (prop == ZPROP_INVAL) {
if (!zfs_prop_user(propname))
return (SET_ERROR(EINVAL));
type = PROP_TYPE_STRING;
} else if (prop == ZFS_PROP_VOLSIZE || prop == ZFS_PROP_VERSION) {
return (SET_ERROR(EINVAL));
} else {
type = zfs_prop_get_type(prop);
}
/*
* zfs_prop_set_special() expects properties in the form of an
* nvpair with type info.
*/
dummy = fnvlist_alloc();
switch (type) {
case PROP_TYPE_STRING:
VERIFY(0 == nvlist_add_string(dummy, propname, ""));
break;
case PROP_TYPE_NUMBER:
case PROP_TYPE_INDEX:
VERIFY(0 == nvlist_add_uint64(dummy, propname, 0));
break;
default:
err = SET_ERROR(EINVAL);
goto errout;
}
pair = nvlist_next_nvpair(dummy, NULL);
if (pair == NULL) {
err = SET_ERROR(EINVAL);
} else {
err = zfs_prop_set_special(zc->zc_name, source, pair);
if (err == -1) /* property is not "special", needs handling */
err = dsl_prop_inherit(zc->zc_name, zc->zc_value,
source);
}
errout:
nvlist_free(dummy);
return (err);
}
static int