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SubjectRe: floppy regression from "[PATCH] fix floppy.c to store correct ..."
On Sat, 19 Nov 2005, Jon Masters wrote:

> On Wed, Nov 16, 2005 at 12:59:58AM -0800, Andrew Morton wrote:
>
> > hmm, yes, when floppy_open() does its test we haven't yet gone and
> > determined the state of FD_DISK_WRITABLE. On later opens, we have done, so
> > things work OK.
>
> I stuck a test in for first use and had floppy_release free up policy
> too. But there are a bunch of problems in the floppy driver I've noticed
> in going through it tonight (and there's only so much of that I can take
> at 03:43 on a Saturday morning). I'll hopefully followup again.

This patch fixes it for me. If you cook up anything else I'll give it a go
as well. Thanks Jon.

> diff -urN linux-2.6.14/drivers/block/floppy.c linux-2.6.14_new/drivers/block/floppy.c
> --- linux-2.6.14/drivers/block/floppy.c 2005-10-28 01:02:08.000000000 +0100
> +++ linux-2.6.14_new/drivers/block/floppy.c 2005-11-19 03:17:08.000000000 +0000
> @@ -1610,10 +1610,11 @@
> DPRINT("wp=%x\n", ST3 & 0x40);
> }
> #endif
> - if (!(ST3 & 0x40))
> + if (!(ST3 & 0x40)) {
> SETF(FD_DISK_WRITABLE);
> - else
> + } else {
> CLEARF(FD_DISK_WRITABLE);
> + }
> }
> }
>
> @@ -3677,15 +3678,19 @@
> int drive = (long)inode->i_bdev->bd_disk->private_data;
>
> down(&open_lock);
> +
> if (UDRS->fd_ref < 0)
> UDRS->fd_ref = 0;
> else if (!UDRS->fd_ref--) {
> DPRINT("floppy_release with fd_ref == 0");
> UDRS->fd_ref = 0;
> }
> - if (!UDRS->fd_ref)
> + if (!UDRS->fd_ref) {
> + opened_bdev[drive]->bd_disk->policy = 0;
> opened_bdev[drive] = NULL;
> + }
> floppy_release_irq_and_dma();
> +
> up(&open_lock);
> return 0;
> }
> @@ -3714,6 +3719,13 @@
> USETF(FD_VERIFY);
> }
>
> + /* set underlying gendisk policy to reflect device ro/rw status */
> + if (UDRS->first_read_date && !(UTESTF(FD_DISK_WRITABLE))) {
> + inode->i_bdev->bd_disk->policy = 1;
> + } else {
> + inode->i_bdev->bd_disk->policy = 0;
> + }
> +
> if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
> goto out2;
>
> @@ -3788,6 +3800,7 @@
> if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
> goto out;
> }
> +
> up(&open_lock);
> return 0;
> out:
>

--
Phishing, pharming; n.: Ways to obtain phood. -- The Devil's Infosec Dictionary

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