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Date: Sun, 21 Oct 2007 16:03:47 +0800 From: "Nai XIA" <nelson.xia@...il.com> To: linux-kernel@...r.kernel.org Subject: The meaning of first_logical_block in do_mpage_readpage hi, it may be a stupid question, but I am not quite clear about what "first_logical_block" is used for as one of parameters of "do_mpage_readpage". I searched all the source code and I found that "first_logical_block" always equals zero when passed to "do_mpage_readpage" and is used only in scope of "do_mpage_readpage". This makes me wonder about: 1. when should "first_logical_block" passed as non-zero values ? 2. why "first_logical_block" is one of args of "do_mpage_readpage" instead of being a local variable of it ? ( it seems that no one uses "first_logical_block" outside "do_mpage_readpage") Anyone can help me out . Thanks in advance! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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