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SubjectRe: [PATCH 2.5.74-mm2] nbd: make nbd and block layer agree about device and block sizes
On Sun, 6 Jul 2003, Jeff Garzik wrote:

> Paul Clements wrote:
> > case NBD_SET_BLKSIZE:
> > - if ((arg & (arg-1)) || (arg < 512) || (arg > PAGE_SIZE))
> > - return -EINVAL;
> > lo->blksize = arg;
> > - lo->bytesize &= ~(lo->blksize-1);
> > + lo->bytesize &= ~(lo->blksize-1);
> > + inode->i_bdev->bd_inode->i_size = lo->bytesize;
> > + set_blocksize(inode->i_bdev, lo->blksize);
> > set_capacity(lo->disk, lo->bytesize >> 9);
> > return 0;
> > case NBD_SET_SIZE:
> > - lo->bytesize = arg & ~(lo->blksize-1);
> > + lo->bytesize = arg & ~(lo->blksize-1);
> > + inode->i_bdev->bd_inode->i_size = lo->bytesize;
> > + set_blocksize(inode->i_bdev, lo->blksize);
> > set_capacity(lo->disk, lo->bytesize >> 9);
> > return 0;
> > case NBD_SET_SIZE_BLOCKS:
> > lo->bytesize = ((u64) arg) * lo->blksize;
> > + inode->i_bdev->bd_inode->i_size = lo->bytesize;
> > + set_blocksize(inode->i_bdev, lo->blksize);
> > set_capacity(lo->disk, lo->bytesize >> 9);
> > return 0;
> > case NBD_DO_IT:
>
>
> Thanks. You forgot to check set_blocksize's return value for errors,
> though.
>
> Also, I wonder if you found a bug/oversight in set_blocksize -- it sets
> bd_inode->i_blkbits but not bd_inode->i_size. I think it should set
> i_size also. Maybe Andrew or Al can confirm/refute this assertion.

OK, I'll wait for a response on this, and then redo the patch as appropriate...

--
Paul

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