Re: [linux-lvm] LVM2 modifies the buffer_head struct?

From: Andrew Morton (akpm@zip.com.au)
Date: Thu Jul 04 2002 - 00:44:39 EST


Neil Brown wrote:
>
> ...
> We just want ext3/jbd to make sure that it only calls bh2jh on
> an unlocked buffer... is that easy?

It's feasible, but a downright pita.

> Ofcourse this ceases to be an issue in 2.5 because the filesys uses
> pages or buffer_heads and the device driver uses bios.

Well, for 2.4 I'd be inclined to just add the extra field to
struct buffer_head and be done with it.

Current sizeof(buffer_head) is 96 bytes, and making that 100 would
be a nuisance, but its quite easy to shrink the buffer_head a
bit (replace b_inode with BH_inode, say...).

-
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sun Jul 07 2002 - 22:00:12 EST