Azure Files NFSv4 Support for XFStesting #4253

shekharsorot · 2026-01-28T05:54:19Z

Pull Request Summary: Azure Files NFSv4 Support

Overview

This PR adds comprehensive NFSv4.1 protocol support for Azure Files testing in LISA, including:

A new unified AzureFileShare class that handles both SMB and NFS protocols
A fully implemented xfstests test case (verify_azure_file_share_nfsv4) with parallel worker execution
A basic NFS mount smoke test (verify_nfsv4_basic) for quick validation
The legacy Nfs class is preserved for backward compatibility (to be removed in future)

Key Changes

1. Unified `AzureFileShare` Class with Protocol Support

File: lisa/sut_orchestrator/azure/features.py

The AzureFileShare class now supports both SMB and NFS protocols via create_share():

# SMB (default)
azure_file_share.create_share(
    protocol=FileShareProtocol.SMB,
    connectivity=FileShareConnectivity.PRIVATE_ENDPOINT
)

# NFS
azure_file_share.create_share(
    protocol=FileShareProtocol.NFS,
    connectivity=FileShareConnectivity.PRIVATE_ENDPOINT
)

New Enums Added:

Enum	Values	Purpose
`FileShareProtocol`	SMB, NFS	Protocol selection
`FileShareAuthMode`	SHARED_KEY, MANAGED_IDENTITY, KERBEROS, NETWORK	Authentication mode
`NfsSecurityMode`	SYS	NFS security modes (future: KRB5, KRB5I, KRB5P)
`FileShareConnectivity`	PUBLIC, PRIVATE_ENDPOINT, SERVICE_ENDPOINT	Connectivity options

Storage Account Naming:

Unified prefix: lisafs<random10chars> (supports both SMB and NFS)

2. NFS xfstests Test Case: `verify_azure_file_share_nfsv4`

File: lisa/microsoft/testsuites/xfstests/xfstesting.py

Fully implemented xfstests validation with parallel worker execution:

Feature	Details
Parallel Workers	Default 6 workers, each with own xfstests copy
Separate Shares	Each worker gets dedicated test/scratch NFS shares
Test Cases	74 generic tests validated for Azure Files NFS
Excluded Tests	29 tests excluded (unsupported features documented)
Mount Options	`vers=4,minorversion=1,sec=sys`

NFS Test Configuration:

_default_nfs_mount_opts = "vers=4,minorversion=1,sec=sys"
_default_nfs_excluded_tests = "generic/013 generic/014 ..."  # 29 excluded tests
_default_nfs_testcases = "generic/001 generic/005 ..."       # 74 tests

3. NFS Smoke Test: `verify_nfsv4_basic`

File: lisa/microsoft/testsuites/core/storage.py

Renamed from verify_azure_file_share_nfs to verify_nfsv4_basic. Simple NFS mount validation:

# Uses unified AzureFileShare class with NFS protocol
azure_file_share.create_share(
    protocol=FileShareProtocol.NFS,
    connectivity=FileShareConnectivity.PRIVATE_ENDPOINT
)
# Mount and verify...

4. Legacy `Nfs` Class Preserved

File: lisa/sut_orchestrator/azure/features.py

The original Nfs class is unchanged and preserved for backward compatibility:

Inherits from AzureFeatureMixin, features.Nfs
Used by any existing tests that haven't migrated
Will be removed in a future PR once all consumers migrate

5. NFS Worker Setup Helper

File: lisa/microsoft/testsuites/xfstests/xfstesting.py

New helper method _setup_azure_nfs_workers() that:

Configures AzureFileShare for NFS protocol
Creates per-worker NFS shares using _deploy_azure_file_share()
Mounts shares using NFSClient tool
Configures xfstests local.config for each worker

Technical Details

Azure Files NFS Requirements

Requirement	Value	Reason
Storage SKU	Premium_LRS	NFS requires Premium tier
Account Kind	FileStorage	NFS requires FileStorage
HTTPS	Disabled	NFS doesn't use HTTPS
Private Endpoint	Required	NFS has no public endpoint access
Shared Key Access	Disabled	NFS uses network-based auth

NFS Mount Options

vers=4,minorversion=1,sec=sys

Resource Naming Conventions

Resource	Pattern
Storage Account	`lisafs<random10chars>`
Private Endpoint	`<storageaccount>-file-pe`
File Shares	Caller-specified

Architecture

Protocol Selection Flow

AzureFileShare.create_share(protocol, connectivity)
        │
        ├── SMB: Uses CIFS mount with credential file
        │        Storage: lisafs*, HTTPS enabled
        │
        └── NFS: Uses NFSClient mount (no credentials)
                 Storage: lisafs*, HTTPS disabled, Premium required

Parallel Worker Architecture (xfstests)

XfstestsParallelRunner
        │
        ├── Worker 1: xfstests copy + test_share_w1 + scratch_share_w1
        ├── Worker 2: xfstests copy + test_share_w2 + scratch_share_w2
        ├── Worker 3: xfstests copy + test_share_w3 + scratch_share_w3
        ├── Worker 4: xfstests copy + test_share_w4 + scratch_share_w4
        ├── Worker 5: xfstests copy + test_share_w5 + scratch_share_w5
        └── Worker 6: xfstests copy + test_share_w6 + scratch_share_w6

Files Changed

File	Change Type	Description
`lisa/sut_orchestrator/azure/features.py`	Modified	Added protocol enums, updated AzureFileShare with `create_share()`, preserved Nfs class
`lisa/microsoft/testsuites/xfstests/xfstesting.py`	Modified	Added `verify_azure_file_share_nfsv4`, `_setup_azure_nfs_workers()`, NFS test config
`lisa/microsoft/testsuites/core/storage.py`	Modified	Renamed `verify_azure_file_share_nfs` → `verify_nfsv4_basic`, uses unified AzureFileShare

Testing

Test Cases

Test Name	File	Description
`verify_azure_file_share_nfsv4`	xfstesting.py	Comprehensive xfstests with parallel workers (74 tests)
`verify_nfsv4_basic`	storage.py	Simple NFS mount smoke test
`verify_azure_file_share`	xfstesting.py	Existing SMB xfstests (unchanged)

Run Commands

# Run NFS xfstests (comprehensive)
lisa -r azure.yml -v testcase:verify_azure_file_share_nfsv4

# Run NFS smoke test (quick)
lisa -r azure.yml -v testcase:verify_nfsv4_basic

Recommended Test Images

Image	OS
`canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest`	Ubuntu 22.04
`canonical ubuntu-24_04-lts server latest`	Ubuntu 24.04
`redhat rhel 9_5 latest`	RHEL 9.5
`microsoftcblmariner azure-linux-3 azure-linux-3-gen2 latest`	Azure Linux 3

NFS Test Exclusions

Tests excluded due to Azure Files NFS limitations (29 total):

Category	Tests	Reason
Hard links	generic/013	`link()` syscall not supported
Sparse files	generic/014, 129, 130, 239, 240, 469, 567	Hole punching not supported
Device nodes	generic/184, 306	mknod/mkfifo not supported
mkfs_sized	generic/211	Cloud filesystem, cannot run mkfs
fallocate	generic/071, 086, 214, 228, 286, 315, 391, 422, 568, 590	Not implemented
NFS-specific	generic/024, 117, 465, 528, 599, 635	Protocol limitations
Timeout-prone	generic/070, 504	May timeout on cloud filesystems

Future Work

Remove legacy Nfs class once all consumers migrate to AzureFileShare
Managed Identity support for SMB (using FileShareAuthMode.MANAGED_IDENTITY)
Encryption-in-transit for NFS (Kerberos modes: KRB5, KRB5I, KRB5P)
Service endpoint connectivity option for NFS

Breaking Changes

Change	Migration
`verify_azure_file_share_nfs` renamed	Use `verify_nfsv4_basic`

Backward Compatibility

Component	Status
`verify_azure_file_share` (SMB xfstests)	✅ Unchanged
`AzureFileShare` class	✅ Backward compatible (default = SMB)
`Nfs` class (lisa.sut_orchestrator.azure.features)	✅ Preserved for compatibility
`Nfs` base class (lisa.features.nfs)	✅ Unchanged

References

Key Test Cases: verify_azure_file_share_nfsv4 | verify_nfsv4_basic

Impacted LISA Features: AzureFileShare, Nfs

Tested Azure Marketplace Images:

canonical 0001-com-ubuntu-server-jammy 22_04-lts-gen2 latest
canonical ubuntu-24_04-lts server latest
redhat rhel 9_5 latest
microsoftcblmariner azure-linux-3 azure-linux-3-gen2 latest

Copilot

Pull request overview

This pull request adds comprehensive Azure Files NFSv4.1 protocol support to LISA's testing framework. The changes introduce a unified AzureFileShare class that handles both SMB and NFS protocols through a configurable set_protocol() method, while preserving the legacy Nfs class for backward compatibility.

Changes:

Adds protocol-aware Azure File Share management with NFS and SMB support via new enums and set_protocol() configuration
Implements parallel NFSv4.1 xfstests validation (verify_azure_file_share_nfsv4) with 73 validated test cases across 4 workers
Refactors storage test to use unified AzureFileShare class (verify_nfsv4_basic, renamed from verify_azure_file_share_nfs)

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lisa/sut_orchestrator/azure/features.py	Adds FileShareProtocol/AuthMode/Connectivity enums, unified AzureFileShare with set_protocol() method, NFS-specific storage account configuration, preserves legacy Nfs class
lisa/sut_orchestrator/azure/common.py	Implements protocol-aware file share creation/deletion using ARM API for NFS (shared key disabled) and data plane API for SMB
lisa/microsoft/testsuites/xfstests/xfstests.py	Adds deferred notification support for parallel workers, file existence timeout handling, random delay to prevent SSH connection pool contention
lisa/microsoft/testsuites/xfstests/xfstesting.py	Implements verify_azure_file_share_nfsv4 with parallel workers, NFS worker setup helper, unified cleanup method for SMB/NFS protocols
lisa/microsoft/testsuites/core/storage.py	Renames verify_azure_file_share_nfs to verify_nfsv4_basic, migrates from legacy Nfs class to unified AzureFileShare with NFS protocol

lisa/sut_orchestrator/azure/features.py

lisa/sut_orchestrator/azure/common.py

Copilot

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 10 comments.

lisa/sut_orchestrator/azure/features.py

lisa/microsoft/testsuites/xfstests/xfstesting.py

lisa/microsoft/testsuites/xfstests/xfstests.py

lisa/microsoft/testsuites/xfstests/xfstesting.py

lisa/sut_orchestrator/azure/features.py

lisa/microsoft/testsuites/xfstests/xfstesting.py

initial commit

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LiliDeng requested a review from Copilot January 28, 2026 15:31

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shekharsorot added 9 commits January 29, 2026 12:52

Fixes for SSH sessions exceeding connection limits

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Update xfstesting.py

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Fix mypy type errors for CI compliance

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shekharsorot requested a review from Copilot January 30, 2026 06:30

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shekharsorot added 2 commits February 2, 2026 13:48

noauto mount fix

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Update features.py

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shekharsorot marked this pull request as ready for review February 2, 2026 09:35

shekharsorot requested a review from LiliDeng as a code owner February 2, 2026 09:35

Merge branch 'microsoft:main' into shsorot/azfiles_nfs_support

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Azure Files NFSv4 Support for XFStesting #4253

Azure Files NFSv4 Support for XFStesting #4253

shekharsorot commented Jan 28, 2026 •

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shekharsorot commented Jan 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Pull Request Summary: Azure Files NFSv4 Support

Overview

Key Changes

1. Unified AzureFileShare Class with Protocol Support

2. NFS xfstests Test Case: verify_azure_file_share_nfsv4

3. NFS Smoke Test: verify_nfsv4_basic

4. Legacy Nfs Class Preserved

5. NFS Worker Setup Helper

Technical Details

Azure Files NFS Requirements

NFS Mount Options

Resource Naming Conventions

Architecture

Protocol Selection Flow

Parallel Worker Architecture (xfstests)

Files Changed

Testing

Test Cases

Run Commands

Recommended Test Images

NFS Test Exclusions

Future Work

Breaking Changes

Backward Compatibility

References

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shekharsorot commented Jan 28, 2026 •

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1. Unified `AzureFileShare` Class with Protocol Support

2. NFS xfstests Test Case: `verify_azure_file_share_nfsv4`

3. NFS Smoke Test: `verify_nfsv4_basic`

4. Legacy `Nfs` Class Preserved