* get_block
@ 2009-05-18 19:32 Alberich de megres
2009-05-18 20:00 ` get_block Josef Bacik
0 siblings, 1 reply; 2+ messages in thread
From: Alberich de megres @ 2009-05-18 19:32 UTC (permalink / raw)
To: linux-fsdevel
Hi!
Again, i got another question this time is about get_block function
used on "mpage_writepages" for address_space_operations writepage.
It is supposed to map the number of blocks passed in sector_t iblock
parameter? or it is asking for the block number iblock?
thanks!!
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: get_block
2009-05-18 19:32 get_block Alberich de megres
@ 2009-05-18 20:00 ` Josef Bacik
0 siblings, 0 replies; 2+ messages in thread
From: Josef Bacik @ 2009-05-18 20:00 UTC (permalink / raw)
To: Alberich de megres; +Cc: linux-fsdevel
On Mon, May 18, 2009 at 09:32:48PM +0200, Alberich de megres wrote:
> Hi!
>
> Again, i got another question this time is about get_block function
> used on "mpage_writepages" for address_space_operations writepage.
>
> It is supposed to map the number of blocks passed in sector_t iblock
> parameter? or it is asking for the block number iblock?
>
> thanks!!
iblock is the relative block # in the inode that you want to map. Whatever you
set as bh_result->b_size is how much will be mapped, so its usually something
like
bh_result->b_size = num_of_blocks_we_want << inode->i_blkbits;
Hope that helps,
Josef
^ permalink raw reply [flat|nested] 2+ messages in thread
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2009-05-18 19:32 get_block Alberich de megres
2009-05-18 20:00 ` get_block Josef Bacik
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