getbmap!!!!!!!

getbmap!!!!!!!

[Anshul Kundra]

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To Developers ,

Please provide me some description regarding the xfs_getbmap what it suppose to do , suppose I want to create a fiule and write on it I got the inode of file then what fields I will send to the xfs getbmap (called via xfs_ioc_getbmapx ) ,

-          What fields of getbmapx structure will be initialized  before passing in the xfs_ioc_getbmapx ?

-          What it will do after passing the fields (Function overview if possible)

-          Why the arg+1 is being passed in the xfs_ioc_getbmapx
I know the reason of formatter

Xfs_ioc_getbmapx(arguments)
{

        Xfs_getbmap();
        Copy_to_user() ; // why the copying done here as in the function itself for every entry it is copying the information into user buffer then why outside the function call here it needs the copy again
}

Thanks & Best Regards
Anshul Kundra

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Re: getbmap!!!!!!!

[Eric Sandeen]

On 03/06/2012 11:11 AM, Anshul Kundra wrote:
> To Developers ,
> 
>  
> 
> Please provide me some description regarding the xfs_getbmap what it
> suppose to do , suppose I want to create a fiule and write on it I got
> the inode of file then what fields I will send to the xfs getbmap
> (called via xfs_ioc_getbmapx ) ,

Please see the "XFS_IOC_GETBMAP" section in the xfsctl(3) man page.

-Eric

> -          What fields of getbmapx structure will be initialized  before
> passing in the xfs_ioc_getbmapx ?
> 
> -          What it will do after passing the fields (Function overview
> if possible)
> 
> -          Why the arg+1 is being passed in the xfs_ioc_getbmapx
> 
> I know the reason of formatter
> 
>  
> 
> Xfs_ioc_getbmapx(arguments)
> 
> {
> 
>  
> 
>         Xfs_getbmap();
> 
>         Copy_to_user() ; // why the copying done here as in the function
> itself for every entry it is copying the information into user buffer
> then why outside the function call here it needs the copy again
> 
> }
> 
>  
> 
> Thanks & Best Regards
> 
> Anshul Kundra
> 
> 
> ------------------------------------------------------------------------

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