Messages in this thread | | | Date | Thu, 15 Nov 2007 12:35:21 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] Attempt to get eject failures back to ioctl(CDROMEJECT) |
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On Thu, Nov 15 2007, Rusty Russell wrote: > On Thursday 15 November 2007 19:47:05 Jens Axboe wrote: > > On Thu, Nov 15 2007, Rusty Russell wrote: > > > If blk_rq_map_sg returns more than was allocated, it's a bug, and > > > something's already been overwritten. BUG_ON() is probably the right > > > thing here. > > > > It really just means that it mapped more segments than the block layer > > said it would. Usually that wont overwrite memory here since scsi rounds > > up on allocating the sg list, but it indeed can. Similar code has been > > in scsi_lib.c for ages, I'd suggest covering that in the same patch. > > Good point. I assume that you've not seen these printks in recent memory?
I have not, they usually show up if we have bugs in the merge accounting logic in the block layer (the merge functions and blk_rq_map_sg() not agreeing). It's been ages since that was an issue, so I'm fine with the bug.
> This covers both cases: > > Subject: [PATCH] scsi: BUG_ON() impossible condition.
You can add my
Acked-by: Jens Axboe <jens.axboe@oracle.com>
when you pass it through James, it should go in that way.
-- Jens Axboe
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