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libceph: supported_features module parameter

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Add a readonly, exported to sysfs module parameter so that userspace
can generate meaningful error messages.  It's a bit funky, but there is
no other libceph-specific place.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2017-03-03 18:16:07 +01:00
parent 74da4a0f57
commit d6a3408a77
1 changed files with 11 additions and 0 deletions
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11
net/ceph/ceph_common.c
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@ -45,6 +45,17 @@ bool libceph_compatible(void *data)
}
EXPORT_SYMBOL(libceph_compatible);
static int param_get_supported_features(char *buffer,
const struct kernel_param *kp)
{
return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
}
static const struct kernel_param_ops param_ops_supported_features = {
.get = param_get_supported_features,
};
module_param_cb(supported_features, &param_ops_supported_features, NULL,
S_IRUGO);
/*
* find filename portion of a path (/foo/bar/baz -> baz)
*/