btrfs: qgroup: return ENOTCONN instead of EINVAL when quotas are not enabled
[PROBLEM] qgroup create/remove code is currently returning EINVAL when the user tries to create a qgroup on a subvolume without quota enabled. EINVAL is already being used for too many error scenarios so that is hard to depict what is the problem. [FIX] Currently scrub and balance code return -ENOTCONN when the user tries to cancel/pause and no scrub or balance is currently running for the desired subvolume. Do the same here by returning -ENOTCONN when a user tries to create/delete/assing/list a qgroup on a subvolume without quota enabled. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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