Messages in this thread | | | Subject | Re: [PATCH v2 5/8] docs: sysfs-block: document stable_writes | From | Bart Van Assche <> | Date | Wed, 8 Dec 2021 14:59:03 -0800 |
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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.
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