[Bug 1998543] Re: fstrim no longer working on some external USB enclosures

[Gordon Lack]

** Description changed:

  Having upgraded from Jammy to Kinetic I now find that fstrim no longer
  works on SSD drives in some external USB enclosures.
  
  The issue is caused by the provisioning_mode status for these now being
  set to disabled, whereas previously they were set to unmap.
  
  Oddly(?) this only occurs on hot-plugging.  I have two of these "permanently" plugged in to one system (so there at boot time) and these still show up as unmap.
  But if I plug in a third enclosure (same chipset, same SSD model, same SSD firmware version as the second one) it shows up as disabled.
  
  ==========
  root at benuc:~# lsusb
  Bus 002 Device 003: ID 152d:0578 JMicron Technology Corp. / JMicron USA Technology Corp. JMS578 SATA 6Gb/s
  Bus 002 Device 002: ID 152d:0578 JMicron Technology Corp. / JMicron USA Technology Corp. JMS578 SATA 6Gb/s
  Bus 002 Device 004: ID 152d:0578 JMicron Technology Corp. / JMicron USA Technology Corp. JMS578 SATA 6Gb/s
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 002: ID 8087:0aaa Intel Corp. Bluetooth 9460/9560 Jefferson Peak (JfP)
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  root at benuc:~# cd /sys/
  /sys
  root at benuc:/sys# find -name provisioning_mode
  ./devices/pci0000:00/0000:00:17.0/ata2/host1/target1:0:0/1:0:0:0/scsi_disk/1:0:0:0/provisioning_mode
  ./devices/pci0000:00/0000:00:17.0/ata3/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0/provisioning_mode
  ./devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host3/target3:0:0/3:0:0:0/scsi_disk/3:0:0:0/provisioning_mode
  ./devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/host4/target4:0:0/4:0:0:0/scsi_disk/4:0:0:0/provisioning_mode
  ./devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0/provisioning_mode
  root at benuc:/sys# cat ./devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host3/target3:0:0/3:0:0:0/scsi_disk/3:0:0:0/provisioning_mode
  unmap
  root at benuc:/sys# cat ./devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/host4/target4:0:0/4:0:0:0/scsi_disk/4:0:0:0/provisioning_mode
  unmap
  root at benuc:/sys# cat ./devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0/provisioning_mode
  disabled
  
  ==========
  
  (Ignore the ata entries - those are internal drives).
  
  If I reboot the system using the old, kept Jammy kernel
  (5.15.0-52-generic) the hot-plug shows up as unmap again.
  
  It's the 5.19.0-2?-generic Kinetic kernels which seem to be causing the
  problem.
  
- 
  I do have a workaround of providing my own udev rule:
  
  ACTION=="add|change", ATTRS{idVendor}=="152d", ATTRS{idProduct}=="0578",
  SUBSYSTEM=="scsi_disk", ATTR{provisioning_mode}="unmap"
  
- which is something I've had to do anyway for some other JMicron chipsets
+ which is something I've had to do anyway for some other ASMedia chipsets
  which do work, but don't get set to unmap by default - 174c:55aa and
  174c:235c.

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https://bugs.launchpad.net/bugs/1998543

Title:
  fstrim no longer working on some external USB enclosures

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