fs/nfs/filelayout/filelayout.c

File Facts

System

Linux kernel

Corpus path

fs/nfs/filelayout/filelayout.c

Extension

.c

Size

31860 bytes

Lines

1154

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/nfs_fs.h
• linux/nfs_page.h
• linux/module.h
• linux/backing-dev.h
• linux/sunrpc/metrics.h
• ../nfs4session.h
• ../internal.h
• ../delegation.h
• filelayout.h
• ../nfs4trace.h

Detected Declarations

• function filelayout_get_dense_offset
• function filelayout_get_dserver_offset
• function filelayout_reset_write
• function filelayout_reset_read
• function filelayout_async_handle_error
• function filelayout_read_done_cb
• function filelayout_set_layoutcommit
• function filelayout_test_devid_unavailable
• function filelayout_reset_to_mds
• function filelayout_read_prepare
• function filelayout_read_call_done
• function filelayout_read_count_stats
• function filelayout_write_done_cb
• function filelayout_commit_done_cb
• function filelayout_write_prepare
• function filelayout_write_call_done
• function filelayout_write_count_stats
• function filelayout_commit_prepare
• function filelayout_commit_count_stats
• function filelayout_read_pagelist
• function filelayout_write_pagelist
• function filelayout_check_deviceid
• function filelayout_check_layout
• function _filelayout_free_lseg
• function filelayout_decode_layout
• function filelayout_free_lseg
• function filelayout_alloc_lseg
• function filelayout_lseg_is_striped
• function filelayout_pg_test
• function fl_pnfs_update_layout
• function filelayout_pg_init_read
• function filelayout_pg_init_write
• function select_bucket_index
• function filelayout_mark_request_commit
• function calc_ds_index_from_commit
• function select_ds_fh_from_commit
• function filelayout_initiate_commit
• function filelayout_commit_pagelist
• function filelayout_alloc_deviceid_node
• function filelayout_free_deviceid_node
• function filelayout_alloc_layout_hdr
• function filelayout_free_layout_hdr
• function filelayout_get_ds_info
• function filelayout_setup_ds_info
• function filelayout_release_ds_info
• function nfs4filelayout_init
• function nfs4filelayout_exit
• module init nfs4filelayout_init

Annotated Snippet

module_init(nfs4filelayout_init);
module_exit(nfs4filelayout_exit);

Annotation

• Immediate include surface: `linux/nfs_fs.h`, `linux/nfs_page.h`, `linux/module.h`, `linux/backing-dev.h`, `linux/sunrpc/metrics.h`, `../nfs4session.h`, `../internal.h`, `../delegation.h`.
• Detected declarations: `function filelayout_get_dense_offset`, `function filelayout_get_dserver_offset`, `function filelayout_reset_write`, `function filelayout_reset_read`, `function filelayout_async_handle_error`, `function filelayout_read_done_cb`, `function filelayout_set_layoutcommit`, `function filelayout_test_devid_unavailable`, `function filelayout_reset_to_mds`, `function filelayout_read_prepare`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.