From: Ted Unangst (teduzeitbombe.org)
Date: Sun Aug 03 2003 - 17:41:35 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Sun, 3 Aug 2003, david ramblewski wrote:

> I am modifying the mount code and i find this:
> malloc(...,M_UFSMNT,...)
>
> In malloc.h:
> #define M_UFSMNT 28
>
> There is a lot of "define" about filesystems in malloc.h and it seems to
> represent every types of memories which can be allocated.
> I'm searching in the source but i don't know how and why they use it.
> Someone knows the solution?
> What does represent a type of memory?

depends. M_UFSMNT is for per mount info. it should be pretty obvious
from the source since each type is only used for one thing in most cases.
look in the ffs source, and see what structure is allocated.
many ffs structures are also stored in pool memory.

> Does someone knows the working of the bread function because it returns me the
> EINVAL error. Does it read a logical block or a physical block?
> I'm trying to read my disk superblock, my creds, vnode and offset seem to be
> correct but i don't know where is the error and i have no idea about it.

it takes logical block numbers. EINVAL is probably because you are
reading past the end of the partition.

--
someone's writing down your mistakes
someone's documenting your downfall

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]