fs/xfs/libxfs/xfs_alloc_btree.h

Source file repositories/reference/linux-study-clean/fs/xfs/libxfs/xfs_alloc_btree.h

File Facts

System
Linux kernel
Corpus path
fs/xfs/libxfs/xfs_alloc_btree.h
Extension
.h
Size
1955 bytes
Lines
70
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __XFS_ALLOC_BTREE_H__
#define	__XFS_ALLOC_BTREE_H__

/*
 * Freespace on-disk structures
 */

struct xfs_buf;
struct xfs_btree_cur;
struct xfs_mount;
struct xfs_perag;
struct xbtree_afakeroot;

/*
 * Btree block header size depends on a superblock flag.
 */
#define XFS_ALLOC_BLOCK_LEN(mp) \
	(xfs_has_crc(((mp))) ? \
		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)

/*
 * Record, key, and pointer address macros for btree blocks.
 *
 * (note that some of these may appear unused, but they are used in userspace)
 */
#define XFS_ALLOC_REC_ADDR(mp, block, index) \
	((xfs_alloc_rec_t *) \
		((char *)(block) + \
		 XFS_ALLOC_BLOCK_LEN(mp) + \
		 (((index) - 1) * sizeof(xfs_alloc_rec_t))))

#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
	((xfs_alloc_key_t *) \
		((char *)(block) + \
		 XFS_ALLOC_BLOCK_LEN(mp) + \
		 ((index) - 1) * sizeof(xfs_alloc_key_t)))

#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
	((xfs_alloc_ptr_t *) \
		((char *)(block) + \
		 XFS_ALLOC_BLOCK_LEN(mp) + \
		 (maxrecs) * sizeof(xfs_alloc_key_t) + \
		 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))

struct xfs_btree_cur *xfs_bnobt_init_cursor(struct xfs_mount *mp,
		struct xfs_trans *tp, struct xfs_buf *bp,
		struct xfs_perag *pag);
struct xfs_btree_cur *xfs_cntbt_init_cursor(struct xfs_mount *mp,
		struct xfs_trans *tp, struct xfs_buf *bp,
		struct xfs_perag *pag);
unsigned int xfs_allocbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
		bool leaf);
extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
		unsigned long long len);

void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
		struct xfs_trans *tp, struct xfs_buf *agbp);

unsigned int xfs_allocbt_maxlevels_ondisk(void);

int __init xfs_allocbt_init_cur_cache(void);
void xfs_allocbt_destroy_cur_cache(void);

#endif	/* __XFS_ALLOC_BTREE_H__ */

Annotation

Implementation Notes