linux-ext4 - Re: a (documented) way to get the Ext2+ filesystem size?

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Message-ID: <20110816142108.GF23416@quack.suse.cz>
Date:	Tue, 16 Aug 2011 16:21:08 +0200
From:	Jan Kara <jack@...e.cz>
To:	Ivan Shmakov <oneingray@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: a (documented) way to get the Ext2+ filesystem size?

On Tue 16-08-11 18:37:23, Ivan Shmakov wrote:
> 	How do I get the Ext2+ filesystem size (in blocks)?
> 
> 	Currently, I do it like:
> 
> static uint_fast64_t
> e2fs_size (ext2_filsys e2)
> {
>   uint_fast32_t hi
>     = (uint_fast32_t)e2->super->s_blocks_count_hi;
>   uint_fast32_t lo
>     = (uint_fast32_t)e2->super->s_blocks_count;
> 
>   /* . */
>   return (((uint64_t)hi << 32) | lo);
> }
> 
> 	However, it seems that there's no documentation for both the
> 	ext2_filsys and struct ext2_super_block structure types, and
> 	their respective member fields.
> 
> 	Am I safe with the code above?
  Yes, this is correct.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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