file system
Enable an AI agent to recognise a computer file system, assess its accessibility and integrity, and determine which file and maintenance operations its semantics and current state permit.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a computer file system, assess its accessibility and integrity, and determine which file and maintenance operations its semantics and current state permit.
A file system is a method of organizing, naming, storing and retrieving files and their metadata, implemented through data structures and operations over storage devices or other data services.
It can be Inspect capabilities, namespace rules, attachment state and storage dependencies.; Resolve paths and enumerate objects while accounting for links and mount boundaries.; Read, create, update, rename, link or remove objects when supported and authorised.; Assess available capacity, quota limits and allocation effects before writing.; Select supported synchronisation or snapshot operations according to required consistency and durability.; Evaluate integrity evidence and plan authorised checking, recovery or attachment changes..
Distinguishing features
Provides file objects and naming or lookup rules; a raw block device provides addressable blocks without necessarily providing files.
Defines how file content and metadata are accessed or changed; an archive format alone does not establish a live file-system service.
Organises or exposes files independently of their application-level meaning; a database primarily organises records under a data and query model.
Is distinct from a mount point: the mount point attaches a file system to a namespace and is not the complete file system.
Can be persistent, memory-backed, remote or synthetic, so neither a physical disk nor durable storage is a necessary recognition test.
Scope
+ File and directory organisation, object identity and pathname resolution
+ File contents, metadata and supported object types
+ Storage backing, allocation and capacity accounting
+ Access rules, operation semantics and concurrent access
+ Mount or attachment state, integrity, recovery and maintenance
- Physical construction, electrical characteristics and health of storage devices
- Internal meaning and application-level correctness of stored documents or datasets
- General operating-system scheduling, process management and virtual memory
- Network transport operation beyond its effects on file-system access
- Database query semantics and transaction models
- Paper filing systems and archival classification schemes
Characteristics
- Backing and exposure type
- local persistent storage | memory-backed | remote service | synthetic | layered | other; combinations permitted Determines dependencies, persistence expectations and which maintenance operations apply.
- Implementation and format
- Implementation, driver or service; format and feature version where applicable Identifies the actual source of supported semantics and compatibility constraints.
- Attachment and write state
- Detached, attached or inaccessible; read-only or writable; observed namespace and time Determines whether operations can reach the file system and whether mutation is currently permitted.
- Namespace rules
- Hierarchy or other organisation; case handling, encoding, normalisation, reserved names and path limits Controls whether names are valid, distinct and portable.
- Supported object types
- Regular files, directories, symbolic links, special objects and implementation-specific types Prevents an agent from treating every pathname as an ordinary byte-stream file.
- Capacity and allocation
- Logical, allocated, free and caller-available bytes; object counts or limits where applicable; unknown or not applicable permitted Distinguishes apparent content size from actual allocation and writable capacity.
- Access-control mechanism
- Permission bits, access-control lists, capabilities, server policy or other mechanisms; combinations permitted Identifies how the effective caller's authority must be evaluated.
- Visibility and durability guarantees
- Documented guarantees for specific operations, concurrent observers, synchronisation calls and failure conditions Separates successful requests from changes that other clients can observe or that survive a failure.
- Integrity assessment
- Unchecked | no issue detected within stated checks | suspected inconsistency | detected inconsistency | recovery in progress; evidence and timestamp Supports proportionate recovery decisions without equating a successful mount with verified integrity.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 27 questions.
Identity and boundaries Establishes what constitutes the file system and which implementation and backing resources determine its behaviour.
A format, driver, volume and mounted instance are related but different referents with different properties.
Kind and instance
Distinguishes shared file-system semantics from a particular deployment.
Referent and implementation
Record whether an observation concerns a file-system kind, implementation or instance, and identify applicable versions and enabled features.
- Does the description identify a file-system kind, an on-disk format, a driver or service, or a particular instance? definition
- Which implementation documentation or instance inspection establishes its version and enabled features? provenance
Backing and attachments
Locates the file system relative to storage resources and exposed namespaces.
Storage and namespace boundary
Record backing resources, remote or layered dependencies, and attachment locations without equating any one attachment with the whole instance.
- Which devices, pools, memory resources, remote exports or lower file-system layers back this instance? boundary
- Where is it exposed to the relevant agent, and which mount or layer boundaries can a path traversal cross? boundary
Namespace and file objects Captures naming, lookup, object identity and the distinction between file contents and metadata.
Correct file operations require knowing what a path identifies and whether multiple paths identify the same object.
Names and resolution
Describes how names become object references.
Pathname equivalence and traversal
Record name validity, case and Unicode handling, lookup roots and link-resolution behaviour.
- Which naming rules determine whether two submitted pathnames resolve to the same name or object? definition
- How must an agent resolve a path while enforcing its permitted root and rules for symbolic links and mount crossings? action
Objects and metadata
Describes the objects reachable through the namespace and their observable attributes.
Object type, identity and attributes
Record supported object types, identity lifetime, link relationships and available metadata with its interpretation.
- Which object types are supported, and how can identity be tracked across renames, hard links and identifier reuse? definition
- Which timestamps, ownership fields, extended attributes or additional data streams exist, and what are their units and meanings? measurement
Allocation and limits Describes how content consumes resources and what constrains further growth.
A file system can reject writes despite apparently free space, and logical file size need not equal physical allocation.
Content allocation
Relates logical file contents to allocated or shared storage.
Logical and allocated size
Distinguish logical length from allocated space and record relevant sparse-file, compression, sharing or copy-on-write behaviour.
- How are logical length and allocated storage measured, including units and accounting boundaries? measurement
- Which supported allocation features change the space required by copying, overwriting or deleting a file? action
Capacity and quotas
Identifies resource ceilings and the capacity available to a particular caller.
Effective write headroom
Record space, metadata or object limits, quotas, reservations and backing-resource constraints that can prevent writes.
- How many bytes and object allocations are available to this caller after quotas and reservations are applied? measurement
- Which file-size, directory, metadata, pool or remote-service limits could prevent the planned write? boundary
Authority and operation semantics Establishes who may operate on files and what individual or concurrent operations promise.
Path access, mutation authority and operation guarantees must be evaluated separately before an agent changes files.
Effective authority
Connects caller identity and applicable policies to permitted operations.
Operation-specific permissions
Evaluate access using the actual caller, path components, object rules and attachment or server restrictions.
- Which identities and permission mechanisms govern traversal, reading, writing, renaming and deletion? definition
- Does the effective caller have authority for the complete planned operation, including its parent-directory changes? action
Atomicity and concurrency
Captures operation boundaries, simultaneous access and visibility between observers.
Mutation and observation guarantees
Record operation-specific atomicity, locking and cache visibility without assuming that several file operations form a transaction.
- What guarantees apply to create, append, replace, rename and delete operations, especially across file-system boundaries? boundary
- Which locking, conditional-operation or validation mechanisms are needed to handle concurrent writers and path changes? action
Durability and recovery Captures persistence expectations, integrity evidence and conditions for maintenance or recovery.
Readable files and successful writes alone do not establish persistence, structural consistency or recoverability.
Persistence contract
Relates acknowledged changes to synchronisation and relevant failure scenarios.
Acknowledgement and survival
Record whether persistence is intended and which operations and dependencies establish durability for data and namespace changes.
- What does a successful write or close establish, and which failure scenarios can still lose the acknowledged change? definition
- Which documented synchronisation steps are required for the intended data and directory changes to survive the relevant failure? action
Integrity and maintenance
Connects observed errors to checking, recovery and safe operational transitions.
Evidence and recovery options
Record integrity-check coverage, reported errors, recovery mechanisms and prerequisites for operations that may alter or discard data.
- Which logs, checks or verified recovery copies support the current integrity assessment, and what remains unchecked? provenance
- What prerequisites and consequences apply to checking, repair, snapshot restoration, read-only transition or detachment? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The computing sense is assumed because no sense is recorded; the PHY.OBJ classification should be reviewed because a file system is not inherently a physical device.
- The listed kinds overlap: one implementation can be both distributed and network-accessible, for example.
- Capacity limits, filename restrictions, performance, durability guarantees and identifier formats depend on the specific implementation and version; no universal typical measurement range is supplied.
- Which of these check these first hold for the sense of file system this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Local disk file systems
- Network file systems
- Distributed file systems
- Memory-resident file systems
- Flash-oriented file systems
- Virtual or pseudo file systems
- Which of these kinds and varieties hold for the sense of file system this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- File-system UUID - Common textual form: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, using hexadecimal digits - Identifies an instance in implementations that support UUIDs; copying a file-system image can duplicate this identifier.
- Volume label - A name subject to implementation-specific length and character restrictions - A human-readable identifier that need not be unique.
- Which of these identifiers and schemes hold for the sense of file system this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- IEEE Std 1003.1 / The Open Group POSIX specifies file-related interfaces and behavior, rather than an on-disk format.
- ISO 9660, issued by ISO, specifies volume and file structure for CD-ROM interchange.
- ECMA-167, issued by Ecma International, specifies volume and file structure for write-once and rewritable media.
- Which of these standards and regulation hold for the sense of file system this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Organizing operating-system, application and user files on computers.
- Sharing files between computers over networks.
- Storing files on removable media and embedded devices.
- Providing distributed access to large collections of files.
- Exposing process, device or kernel information through file-like interfaces.
- Which of these real-world use hold for the sense of file system this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Interrupted writes or power loss can leave inconsistent metadata or incomplete file contents; protection depends on implementation and configuration.
- Storage-media errors can corrupt data or make files inaccessible.
- Exhaustion of free space, metadata capacity or quotas can prevent new files or writes.
- Incorrect permissions or access-control configuration can expose files or block legitimate access.
- Implementation defects or unsuitable concurrent-access arrangements can cause corruption or data loss.
- Which of these failure modes and hazards hold for the sense of file system this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Storage device - A storage device supplies storage capacity; a file system supplies file organization and access semantics over that capacity or another backing service.
- Partition - A partition defines a region of a storage device; it may contain a file system but does not itself define files and directories.
- Database management system - A database management system organizes and queries records under a data model; a file system primarily exposes named files and associated metadata.
- File manager - A file manager is an application for interacting with files; a file system implements their underlying organization and access.
- Physical filing system - A physical filing system organizes tangible documents; this description covers the computing sense.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of file system this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend the computer file-system sense, and how should that sense be reconciled with its PHY / PHY.OBJ placement?
- Does an existing Vercy world model already own this concept or part of its scope?
- Which primary specifications and implementation documents should ground the common model while keeping platform-specific guarantees explicit?
- Should flat namespaces, object-store file interfaces and synthetic file systems share this scope, and which minimum file semantics define their inclusion?
- Which integrity, durability and capacity observations can be obtained reliably across local, remote and layered implementations?