* The meaning of first_logical_block in do_mpage_readpage
@ 2007-10-21 8:03 Nai XIA
2007-10-21 9:40 ` Nai XIA
0 siblings, 1 reply; 2+ messages in thread
From: Nai XIA @ 2007-10-21 8:03 UTC (permalink / raw)
To: linux-kernel
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!
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: The meaning of first_logical_block in do_mpage_readpage
2007-10-21 8:03 The meaning of first_logical_block in do_mpage_readpage Nai XIA
@ 2007-10-21 9:40 ` Nai XIA
0 siblings, 0 replies; 2+ messages in thread
From: Nai XIA @ 2007-10-21 9:40 UTC (permalink / raw)
To: linux-kernel
sorry, I think I've found the point.
first_logical_block is passed out in a "for" loop in "mpage_readpages"
and passed again to the next "do_mpage_readpage".
Sorry for the haste asking.
On 10/21/07, Nai XIA <nelson.xia@gmail.com> wrote:
> 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!
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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