Re: [PATCH] aio: fix kernel bug when page is temporally busy

[Ken Chen]

On 2/9/07, Ananiev, Leonid I <leonid.i.ananiev@xxxxxxxxx> wrote:
> I have used EIOCBRETRY in the patch to minimize source code modification
> only.
> [...]
> A lot of errno's have different meaning in different functions or
> contexts. EAGAIN could be used instated of EIOCBRETRY for irredundant
> set.

I also think the original patch is wrong.  It might shut up kernel
panic by eliminate double calls to aio_complete(), but it will
silently introduce data corruption.

If invalidate_inode_pages2_range() says it can not invalidate pages,
while dio to the same file offset range is in flight, something is
really wrong there.  In generic_file_direct_IO, the function
explicitly flushes all dirty pages and wait on them before submits
DIO.

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.

- Ken
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/