> 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
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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