fs/netfs/rolling_buffer.c

File Facts

System

Linux kernel

Corpus path

fs/netfs/rolling_buffer.c

Extension

.c

Size

5688 bytes

Lines

223

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/bitops.h
• linux/pagemap.h
• linux/rolling_buffer.h
• linux/slab.h
• internal.h

Detected Declarations

• function netfs_folioq_free
• function rolling_buffer_init
• function rolling_buffer_make_space
• function rolling_buffer_load_from_ra
• function rolling_buffer_append
• function rolling_buffer_clear
• export netfs_folioq_alloc
• export netfs_folioq_free

Annotated Snippet

if (folioq_is_marked(p, slot)) {
				trace_netfs_folio(folio, netfs_folio_trace_put);
				if (!folio_batch_add(&fbatch, folio))
					folio_batch_release(&fbatch);
			}
		}

		netfs_folioq_free(p, netfs_trace_folioq_clear);
	}

	folio_batch_release(&fbatch);
}

Annotation

• Immediate include surface: `linux/bitops.h`, `linux/pagemap.h`, `linux/rolling_buffer.h`, `linux/slab.h`, `internal.h`.
• Detected declarations: `function netfs_folioq_free`, `function rolling_buffer_init`, `function rolling_buffer_make_space`, `function rolling_buffer_load_from_ra`, `function rolling_buffer_append`, `function rolling_buffer_clear`, `export netfs_folioq_alloc`, `export netfs_folioq_free`.
• 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.