SRU: Add FUA support for XFS

[Tim Gardner]

SRU justification:

[Impact]

This 4 patch set adds backported support for Forced Unit Access (FUA) on XFS file systems to the 18.04 (Bionic) GA (4.15) kernel. FUA on XFS was added upstream in 4.18.

FUA on XFS is important for SQL server work loads.

[Test Plan]
SQLIOSIM (a package from Microsoft) was used to test performance improvements. Tests were run with an XFS file system mounted on a persistent memory block device (PMEM) partition. Performance metrics were found to exhibit satisfactory improvement gains from the GA kernel.

[Where problems could occur]

Well, these are patches to file system code. They _could_ cause widespread corruption. However, multiple test passes with sqliosim exhibited no issues.

[Other Info]

See attached sqliosim.cfg.ini configuration file for test run parameters.

[Tim Gardner (timg-tpi)]

sqliosim configuration file

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1917918

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Tim Gardner (timg-tpi)]

Patches submitted: https://lists.ubuntu.com/archives/kernel-team/2021-March/117799.html

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Tim Gardner (timg-tpi)]

Testing by Microsoft indicates acceptable performance gains with no regression.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-141.145

---------------
linux (4.15.0-141.145) bionic; urgency=medium

  * bionic/linux: 4.15.0-141.145 -proposed tracker (LP: #1919536)

  * binary assembly failures with CONFIG_MODVERSIONS present (LP: #1919315)
    - [Packaging] quiet (nomially) benign errors in BUILD script

  * selftests: bpf verifier fails after sanitize_ptr_alu fixes (LP: #1920995)
    - bpf: Simplify alu_limit masking for pointer arithmetic
    - bpf: Add sanity check for upper ptr_limit
    - bpf, selftests: Fix up some test_verifier cases for unprivileged

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * CVE-2018-13095
    - xfs: More robust inode extent count validation

  * i40e PF reset due to incorrect MDD event (LP: #1772675)
    - i40e: change behavior on PF in response to MDD event

  * Bionic update: upstream stable patchset 2021-03-09 (LP: #1918330)
    - ACPI: sysfs: Prefer "compatible" modalias
    - ARM: dts: imx6qdl-gw52xx: fix duplicate regulator naming
    - wext: fix NULL-ptr-dereference with cfg80211's lack of commit()
    - net: usb: qmi_wwan: added support for Thales Cinterion PLSx3 modem family
    - drivers: soc: atmel: Avoid calling at91_soc_init on non AT91 SoCs
    - drivers: soc: atmel: add null entry at the end of at91_soc_allowed_list[]
    - KVM: x86/pmu: Fix HW_REF_CPU_CYCLES event pseudo-encoding in
      intel_arch_events[]
    - KVM: x86: get smi pending status correctly
    - xen: Fix XenStore initialisation for XS_LOCAL
    - leds: trigger: fix potential deadlock with libata
    - mt7601u: fix kernel crash unplugging the device
    - mt7601u: fix rx buffer refcounting
    - xen-blkfront: allow discard-* nodes to be optional
    - ARM: imx: build suspend-imx6.S with arm instruction set
    - netfilter: nft_dynset: add timeout extension to template
    - xfrm: Fix oops in xfrm_replay_advance_bmp
    - RDMA/cxgb4: Fix the reported max_recv_sge value
    - iwlwifi: pcie: use jiffies for memory read spin time limit
    - iwlwifi: pcie: reschedule in long-running memory reads
    - mac80211: pause TX while changing interface type
    - can: dev: prevent potential information leak in can_fill_info()
    - x86/entry/64/compat: Preserve r8-r11 in int $0x80
    - x86/entry/64/compat: Fix "x86/entry/64/compat: Preserve r8-r11 in int $0x80"
    - iommu/vt-d: Gracefully handle DMAR units with no supported address widths
    - iommu/vt-d: Don't dereference iommu_device if IOMMU_API is not built
    - NFC: fix resource leak when target index is invalid
    - NFC: fix possible resource leak
    - team: protect features update by RCU to avoid deadlock
    - tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN
    - kernel: kexec: remove the lock operation of system_transition_mutex
    - PM: hibernate: flush swap writer after marking
    - pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()
    - net/mlx5: Fix memory leak on flow table creation error flow
    - rxrpc: Fix memory leak in rxrpc_lookup_local
    - net: dsa: bcm_sf2: put device node before return
    - ibmvnic: Ensure that CRQ entry read are correctly ordered
    - ACPI: thermal: Do...