> Apparently the original patch didn’t send for linux stable branch.
I don't know exactly what you mean, but 4.14 kernel has this patch. It's
easy to verify by changed messages ("enabling ssd optimizations" vs
"enabling SSD mode").
> can you ask the patch author and BTRFS maintainers
I'm not sure how to ask BTRFS maintainers and why I would do so, because
patch description suggests that it should be backported and has notes
about it:
Backporting notes
Notes for whoever wants to backport this patch to their 4.9 LTS kernel:
* First apply commit 951e796 "btrfs: drop the nossd flag when
remounting with -o ssd", or fixup the differences manually.
* The rest of the conflicts are because of the fs_info refactoring. So,
for example, instead of using fs_info, it's root->fs_info in
extent-tree.c
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https://bugs.launchpad.net/bugs/1740143
Title:
backport btrfs ssd mount option fix
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