Date: Sat, 10 Dec 2005 23:01:39 +0800 From: Bowen Zhou <zhou.bowen@gmail.com> To: freebsd-hackers@freebsd.org Subject: Fwd: Object reusement implementation in 6.0release: HELP Wanted!!! Message-ID: <821419ca0512100701oa12651ao34f40c14cae37175@mail.gmail.com> In-Reply-To: <821419ca0512100657u363cdfc6wbae45b207cbd71f2@mail.gmail.com> References: <821419ca0512072329q4ad120c5g367dd2192b91eccd@mail.gmail.com> <20051208120001.GA921@pm513-1.comsys.ntu-kpi.kiev.ua> <821419ca0512081737j1e2f1186r9931b747f1dc0691@mail.gmail.com> <821419ca0512100657u363cdfc6wbae45b207cbd71f2@mail.gmail.com>
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Sorry for reply myself.
I really confused by this problem.
Need your help!!!
On 12/9/05, Bowen Zhou <zhou.bowen@gmail.com> wrote:
> 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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