Date: Fri, 9 Dec 2005 09:37:43 +0800 From: Bowen Zhou <zhou.bowen@gmail.com> To: Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua> Cc: freebsd-hackers@freebsd.org Subject: Re: Object reusement implementation in 6.0release: HELP Wanted!!! Message-ID: <821419ca0512081737j1e2f1186r9931b747f1dc0691@mail.gmail.com> In-Reply-To: <20051208120001.GA921@pm513-1.comsys.ntu-kpi.kiev.ua> References: <821419ca0512072329q4ad120c5g367dd2192b91eccd@mail.gmail.com> <20051208120001.GA921@pm513-1.comsys.ntu-kpi.kiev.ua>
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Thanks for concerning my question.
I need to clean all the data blocks of a inode, including direct disk
blocks, indirect disk blocks and external attributes blocks.
I have tried to insert cleaning code into
ffs_blkfree(/ufs/ffs/ffs_alloc.c), but the result was not good enough.
After compiled the kernel(GENERIC) with my cleaning code and restarted
the computer, I found that some data blocks of normal files which have
not been deleted yet disappeared randomly.
The following is the code I have inserted into ffs_blkfree(including
the beginning part of the original function):
void
ffs_blkfree(ump, fs, devvp, bno, size, inum)
struct ufsmount *ump;
struct fs *fs;
struct vnode *devvp;
ufs2_daddr_t bno;
long size;
ino_t inum;
{
struct cg *cgp;
struct buf *bp;
struct buf *bp1;
ufs1_daddr_t fragno, cgbno;
ufs2_daddr_t cgblkno;
int i, cg, blk, frags, bbase;
u_int8_t *blksfree;
struct cdev *dev;
/*object reuse starts here.*/
if(bread(devvp, fsbtodb(fs, bno), size, NOCRED, &bp1)){
brelse(bp1);
return;
}
bzero(bp1->b_data, size);
bdwrite(bp1);
/*object reuse ends here.*/
....
I guess there are errors in either my cleaning code or the place I
inserted these code.
Any suggestion is welcome.
On 12/8/05, Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua> wrote:
> On Thu, Dec 08, 2005 at 03:29:07PM +0800, Bowen Zhou wrote:
> > hello, everyone.
> >
> > I need solutions to implement object reusement in FreeBSD6.0.
> >
> > What I want to do is to clean the content of data blocks before the
> > re-allocation of them.
> >
> > Then where (in which function ) should I insert my cleaning code in order to
> > fulfill the reusement of data blocks?
>
> About which datablock are you asking?
>
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