On 02/03/2017 12:55 AM, Junichi Nomura wrote:
> I found following ext4 error occurs on a certain storage since v4.10-rc1:
> EXT4-fs (sdc1): Delayed block allocation failed for inode 12 at logical offset 100 with max blocks 2 with error 121
> EXT4-fs (sdc1): This should not happen!! Data will be lost
>
> Error 121 (EREMOTEIO) was returned from blkdev_issue_zeroout().
> That came from sd driver because WRITE SAME was sent to the device
> which didn't support it.
>
> The problem was introduced by commit e73c23ff736e ("block: add async
> variant of blkdev_issue_zeroout"). Before the commit, blkdev_issue_zeroout
> fell back to normal zero writing when WRITE SAME failed and it seems
> sd driver's heuristics depends on that behaviour.
CC Christoph and Chaitanya.
--
Jens Axboe
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