linux-kernel - RE: [PATCH] aio: fix kernel bug when page is temporally busy

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Date:	Sun, 11 Feb 2007 00:57:18 +0300
From:	"Ananiev, Leonid I" <leonid.i.ananiev@...el.com>
To:	"Ken Chen" <kenchen@...gle.com>
Cc:	<suparna@...ibm.com>, "Andrew Morton" <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, "linux-aio" <linux-aio@...ck.org>,
	"Zach Brown" <zach.brown@...cle.com>,
	"Chris Mason" <chris.mason@...cle.com>,
	"Badari Pulavarty" <pbadari@...ibm.com>
Subject: RE: [PATCH] aio: fix kernel bug when page is temporally busy

Ken Chen writes:
> So any error value returned from invalidate_inode_pages2_range() has
> to be taken seriously in the direct IO submit path instead of dropping
> it to the floor.

If invalidate_inode_pages2_range() will return EIOCBRETRY as the patch 
"aio: fix kernel bug when page is temporally busy"
serts then do_sync_read/write() will not drop IO submit but will retry
it:
        for (;;) {
                ret = filp->f_op->aio_read(&kiocb, &iov, 1,
kiocb.ki_pos);
                if (ret != -EIOCBRETRY)
                        break;
                wait_on_retry_sync_kiocb(&kiocb);
        }

And do_sync_read/write() will not return EIO if page is busy as it does
now, befor patching.
Curretly do_sync_read/write() tests for EIOCBRETRY. But EIOCBRETRY is
not set ever.

Leonid
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