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@MatthewRead dude that is one of the ways how you can gain a root access.. please read the question carefully before giving such a rude comment. his question is "how to root Galaxy SL GT i9003 for DDLF2" so flashing the above mentioned kernel is one of the way.. and it's probably best kernel around for that phone.. I have same phone.. so please if you don't know.. stop giving comments so rudely!
i have 2 android phones.. I have never seen this case "After installing CWM I lost data!" . Check if you tried to do Factory reset via CWM! if you did Factory reset that might have caused you to loose userdata.
