On 11/7/20 1:04 AM, John Hubbard wrote:
On 11/7/20 12:24 AM, Souptick Joarder wrote:
In 2019, we introduced pin_user_pages*() and now we are converting
get_user_pages*() to the new API as appropriate. [1] & [2] could
be referred for more information. This is case 5 as per document [1].
It turns out that Case 5 can be implemented via a better pattern, as long
as we're just dealing with a page at a time, briefly:
lock_page()
write to page's data
unlock_page()
...which neatly synchronizes with writeback and other fs activities.
Ahem, I left out a key step: set_page_dirty()!
lock_page()
write to page's data
set_page_dirty()
unlock_page()
thanks,
--
John Hubbard
NVIDIA