rbd: supported_features bus attribute
... so that userspace can generate meaningful error messages and spell out unsupported features that need to be disabled. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
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@ -120,10 +120,11 @@ static int atomic_dec_return_safe(atomic_t *v)
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/* Feature bits */
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#define RBD_FEATURE_LAYERING (1<<0)
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#define RBD_FEATURE_STRIPINGV2 (1<<1)
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#define RBD_FEATURE_EXCLUSIVE_LOCK (1<<2)
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#define RBD_FEATURE_DATA_POOL (1<<7)
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#define RBD_FEATURE_LAYERING (1ULL<<0)
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#define RBD_FEATURE_STRIPINGV2 (1ULL<<1)
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#define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2)
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#define RBD_FEATURE_DATA_POOL (1ULL<<7)
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#define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \
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RBD_FEATURE_STRIPINGV2 | \
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RBD_FEATURE_EXCLUSIVE_LOCK | \
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@ -499,16 +500,23 @@ static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
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return is_lock_owner;
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}
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static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf)
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{
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return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
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}
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static BUS_ATTR(add, S_IWUSR, NULL, rbd_add);
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static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove);
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static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major);
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static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major);
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static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL);
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static struct attribute *rbd_bus_attrs[] = {
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&bus_attr_add.attr,
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&bus_attr_remove.attr,
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&bus_attr_add_single_major.attr,
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&bus_attr_remove_single_major.attr,
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&bus_attr_supported_features.attr,
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NULL,
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};
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