fs/btrfs/delalloc-space.h

File Facts

System

Linux kernel

Corpus path

fs/btrfs/delalloc-space.h

Extension

.h

Size

1322 bytes

Lines

32

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: implementation source

Status

source 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h

Detected Declarations

• struct extent_changeset
• struct btrfs_inode
• struct btrfs_fs_info

Annotated Snippet

#ifndef BTRFS_DELALLOC_SPACE_H
#define BTRFS_DELALLOC_SPACE_H

#include <linux/types.h>

struct extent_changeset;
struct btrfs_inode;
struct btrfs_fs_info;

int btrfs_alloc_data_chunk_ondemand(const struct btrfs_inode *inode, u64 bytes);
int btrfs_check_data_free_space(struct btrfs_inode *inode,
			struct extent_changeset **reserved, u64 start, u64 len,
			bool noflush);
void btrfs_free_reserved_data_space(struct btrfs_inode *inode,
			struct extent_changeset *reserved, u64 start, u64 len);
void btrfs_delalloc_release_space(struct btrfs_inode *inode,
				  struct extent_changeset *reserved,
				  u64 start, u64 len, bool qgroup_free);
void btrfs_free_reserved_data_space_noquota(struct btrfs_inode *inode, u64 len);
void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
				     bool qgroup_free);
int btrfs_delalloc_reserve_space(struct btrfs_inode *inode,
			struct extent_changeset **reserved, u64 start, u64 len);
int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes,
				    u64 disk_num_bytes, bool noflush);
void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
void btrfs_delalloc_shrink_extents(struct btrfs_inode *inode, u64 reserved_len, u64 new_len);

#endif /* BTRFS_DELALLOC_SPACE_H */

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `struct extent_changeset`, `struct btrfs_inode`, `struct btrfs_fs_info`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: source implementation candidate.

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.