linux-kernel - Re: [PATCH V2 0/2] Auto stop async-write on block device when device removed.

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Message-ID: <x49r4cfy4py.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 23 Sep 2013 10:47:53 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	majianpeng <majianpeng@...il.com>
Cc:	axboe <axboe@...nel.dk>, viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH V2 0/2] Auto stop async-write on block device when device removed.

majianpeng <majianpeng@...il.com> writes:

> For async-write on block device,if device removed,but the vfs don't know it.
> It will continue to do.
> Patch1 set size of inode of block device to zero when removed disk.By this,vfs know 
> disk changed.
> Path2 add size-check on blk_aio_write.If pos of write larger than size of inode,it will
> return zero.So the user can check disk state.

OK, so the basic problem is that __generic_file_aio_write will always
return 0 after device removal, yes?  I'm not sure why that's a real
issue, can you explain exactly why you're trying to change this?

As for your patches, I don't think that putting the i_size_write into
invalidate_partitions is a good idea.  Consider the case of rescanning
partitions: you will always detect a size change now, which is not good.

Cheers,
Jeff
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