fs/xfs/xfs_extfree_item.h

File Facts

System

Linux kernel

Corpus path

fs/xfs/xfs_extfree_item.h

Extension

.h

Size

3208 bytes

Lines

101

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct xfs_mount
• struct kmem_cache
• struct xfs_efi_log_item
• struct xfs_efd_log_item
• struct xfs_extent_free_item
• function xfs_efi_log_item_sizeof
• function xfs_efd_log_item_sizeof

Annotated Snippet

struct xfs_efi_log_item {
	struct xfs_log_item	efi_item;
	atomic_t		efi_refcount;
	atomic_t		efi_next_extent;
	struct xfs_efi_log_format efi_format;
};

static inline size_t
xfs_efi_log_item_sizeof(
	unsigned int		nr)
{
	return offsetof(struct xfs_efi_log_item, efi_format) +
			xfs_efi_log_format_sizeof(nr);
}

/*
 * This is the "extent free done" log item.  It is used to log
 * the fact that some extents earlier mentioned in an efi item
 * have been freed.
 */
struct xfs_efd_log_item {
	struct xfs_log_item	efd_item;
	struct xfs_efi_log_item *efd_efip;
	uint			efd_next_extent;
	struct xfs_efd_log_format efd_format;
};

static inline size_t
xfs_efd_log_item_sizeof(
	unsigned int		nr)
{
	return offsetof(struct xfs_efd_log_item, efd_format) +
			xfs_efd_log_format_sizeof(nr);
}

/*
 * Max number of extents in fast allocation path.
 */
#define	XFS_EFD_MAX_FAST_EXTENTS	16

extern struct kmem_cache	*xfs_efi_cache;
extern struct kmem_cache	*xfs_efd_cache;

struct xfs_extent_free_item;

void xfs_extent_free_defer_add(struct xfs_trans *tp,
		struct xfs_extent_free_item *xefi,
		struct xfs_defer_pending **dfpp);

unsigned int xfs_efi_log_space(unsigned int nr);
unsigned int xfs_efd_log_space(unsigned int nr);

#endif	/* __XFS_EXTFREE_ITEM_H__ */

Annotation

• Detected declarations: `struct xfs_mount`, `struct kmem_cache`, `struct xfs_efi_log_item`, `struct xfs_efd_log_item`, `struct xfs_extent_free_item`, `function xfs_efi_log_item_sizeof`, `function xfs_efd_log_item_sizeof`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: source 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.