> On 2 Jan 2018, at 9:06 PM, Vasya Pupkin <email address hidden> wrote:
> 
>> 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”).

It doesn’t have “Cc: <email address hidden> <mailto:<email address hidden>>”.
Generally important fixes will also send to the stable mailing list, so Linux stable (4.4, 4.9 and 4.14 in this context) can pull it in.

> 
>> 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

I am not a native english speaker, but from what I can understand, it’s more like a caveat instead of a recommendation.

> 
> -- 
> You received this bug notification because you are subscribed to linux
> in Ubuntu.
> https://bugs.launchpad.net/bugs/1740143
> 
> Title:
>  backport btrfs ssd mount option fix
> 
> Status in linux package in Ubuntu:
>  Confirmed
> 
> Bug description:
>  Hello,
> 
>  It appears that all kernels before 4.14 had a problem with btrfs ssd
>  mount option. According to
>  https://btrfs.wiki.kernel.org/index.php/Gotchas#ssd_mount_option, it
>  has a negative impact on usability and lifetime of modern SSDs. Since
>  it is enabled by default when SSD is detected, it affects all systems
>  with SSD drives. Please backport this commit to normal and HWE
>  kernels:
>  https://github.com/torvalds/linux/commit/583b723151794e2ff1691f1510b4e43710293875
> 
>  ProblemType: Bug
>  DistroRelease: Ubuntu 16.04
>  Package: linux-image-generic 4.4.0.104.109
>  ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
>  Uname: Linux 4.4.0-104-generic x86_64
>  AlsaDevices:
>   total 0
>   crw-rw---- 1 root audio 116,  1 дек 17 10:50 seq
>   crw-rw---- 1 root audio 116, 33 дек 17 10:50 timer
>  AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-104-generic.
>  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
>  ApportVersion: 2.20.1-0ubuntu2.14
>  Architecture: amd64
>  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
>  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
>  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
>  Date: Tue Dec 26 18:57:10 2017
>  InstallationDate: Installed on 2011-04-14 (2448 days ago)
>  InstallationMedia: Ubuntu-Server 10.04.2 LTS "Lucid Lynx" - Release amd64 (20110211.1)
>  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
>  PciMultimedia:
> 
>  ProcFB: 0 nouveaufb
>  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-104-generic root=UUID=c7605446-0bf3-11e7-bfa0-f91abd974ce1 ro quiet bootdegraded=true
>  RelatedPackageVersions:
>   linux-restricted-modules-4.4.0-104-generic N/A
>   linux-backports-modules-4.4.0-104-generic  N/A
>   linux-firmware                             1.157.14
>  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
>  SourcePackage: linux
>  UpgradeStatus: Upgraded to xenial on 2016-07-30 (513 days ago)
>  WifiSyslog:
> 
>  dmi.bios.date: 02/20/2008
>  dmi.bios.vendor: American Megatrends Inc.
>  dmi.bios.version: P1.40
>  dmi.board.name: 4Core1333-eSATA2.
>  dmi.chassis.asset.tag: To Be Filled By O.E.M.
>  dmi.chassis.type: 3
>  dmi.chassis.vendor: To Be Filled By O.E.M.
>  dmi.chassis.version: To Be Filled By O.E.M.
>  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.40:bd02/20/2008:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvn:rn4Core1333-eSATA2.:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
>  dmi.product.name: To Be Filled By O.E.M.
>  dmi.product.version: To Be Filled By O.E.M.
>  dmi.sys.vendor: To Be Filled By O.E.M.
> 
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