Re: [PATCH] iomap: submit read bio after each extent

[Gao Xiang <hsiangkao@linux.alibaba.com>]

Hi Christian,

On 2026/6/19 18:15, Christian Brauner wrote:
> On Fri, 19 Jun 2026 07:00:53 +0200, Christoph Hellwig wrote:
>> Currently the iomap buffered read path tries to build up read context
>> (i.e. bios for the typical block based case) over multiple iomaps as
>> long as the sector matches.  This does not take into account files
>> that can map to multiple different devices.  While this could be fixed
>> by a bdev check in iomap_bio_read_folio_range, the building up of I/O
>> over iomaps actually was a problem for the not yet merged ext2 iomap
>> port, as that does want to send out I/O at the end of an indirect
>> block mapped range.
>>
>> [...]
> 
> Applied to the vfs-7.3.iomap branch of the vfs/vfs.git tree.
> Patches in the vfs-7.3.iomap branch should appear in linux-next soon.

btw, could we address this issue in the 7.2 cycle?

Not because that is a quite common case and needs a rush fix,
but Just because that can be reproducible under given
circumstances and users can get corrupted data.

Or if we need to hear thoughts from others, I think we could
delay one or two weeks though.

Thanks,
Gao Xiang