Basically, I am going to trace all requests to rd and see if ever get any
READ requests. I don't yet understand how this mechanism "page cache" is
going to satisfy all requests before they actually hit the block device
layer. I suppose the fileops points to block_read/block_write so that is
how things happen. So, I need to trace all io via block_read/write for
the specific rdev corresponding to my device.
Still looking (but soon will be sleeping)
Tigran.
On Mon, 15 Nov 1999, Mr. James W. Laferriere wrote:
>
> Hello Tigrand, By chance is there a fs update being run ?
> this actually sounds as if the fs data isn't being written
> to the fs in question . Maybe I am way off track to . Hth JimL
>
> On Mon, 15 Nov 1999, Eleonora Autore wrote:
> > > # od -tx4 -Ax /mnt/sbin/init
> > > 000000 00000000 00000000 00000000 00000000
> > > *
> > > 006420 00000000
> > > 006424
> > more info, if I create a new file and write some data to it I can read it
> > back ok, but if I umount/mount fs again then that file's data is filled
> > with zeroes but metadata is read correctly.
> > Besides, I am looking at the rd_request() and it looks like a joke:
> >
> > if (CURRENT->cmd == READ)
> > memset(CURRENT->buffer, 0, len);
> > else
> > set_bit(BH_Protected, &CURRENT->bh->b_state);
> > how can it possibly be so simple - where is the actual io? On the other
> > hand, it is the same in 2.2.x and 2.2.12 works fine.
> > Still looking....
> > Tigran.
> +----------------------------------------------------------------+
> | James W. Laferriere | System Techniques | Give me VMS |
> | Network Engineer | 25416 22nd So | Give me Linux |
> | babydr@baby-dragons.com | DesMoines WA 98198 | only on AXP |
> +----------------------------------------------------------------+
>
>
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