Re: [PATCH v2 5/8] docs: sysfs-block: document stable_writes

[Bart Van Assche]

On 12/8/21 2:34 PM, Eric Biggers wrote:
> Yes, I meant "written out to disk" in the general sense of writeback, not in the
> sense of when the data reaches its final destination.  I'm not sure what the
> best way to explain it is.  I think it's more than just "the process of
> transferring data from host memory to the device", as that is just part of a
> write request, whereas stable_writes applies to whole requests.  How about:
>
> 		[RW] This file will contain '1' if memory must not be modified
> 		while it is being used in a write request to this device.  When
> 		this is the case and the kernel is performing writeback of a
> 		page, the kernel will wait for writeback to complete before
> 		allowing the page to be modified again, rather than allowing
> 		immediate modification as is normally the case.  This
> 		restriction arises when the device accesses the memory multiple
> 		times where the same data must be seen every time -- for
> 		example, once to calculate a checksum and once to actually write
> 		the data.  If no such restriction exists, this file will contain
> 		'0'.  This file is writable for testing purposes.

The above sounds good to me.

Thanks,

Bart.