fs/xfs/libxfs/xfs_bmap_btree.h

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

File Facts

System
Linux kernel
Corpus path
fs/xfs/libxfs/xfs_bmap_btree.h
Extension
.h
Size
5408 bytes
Lines
205
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_BMAP_BTREE_H__
#define __XFS_BMAP_BTREE_H__

struct xfs_btree_cur;
struct xfs_btree_block;
struct xfs_mount;
struct xfs_inode;
struct xfs_trans;
struct xbtree_ifakeroot;

/*
 * Maximum number of bmap btree levels.
 */
#define XFS_BM_MAXLEVELS(mp,w)		((mp)->m_bm_maxlevels[(w)])

/*
 * Prototypes for xfs_bmap.c to call.
 */
extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
			struct xfs_btree_block *, int);

void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(const struct xfs_bmbt_rec *r);
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(const struct xfs_bmbt_rec *r);
void xfs_bmbt_disk_get_all(const struct xfs_bmbt_rec *r,
		struct xfs_bmbt_irec *s);

extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
			xfs_bmdr_block_t *, int);

extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
unsigned int xfs_bmbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
		bool leaf);

extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
				 int whichfork, xfs_ino_t new_owner,
				 struct list_head *buffer_list);

extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
		struct xfs_trans *, struct xfs_inode *, int);
void xfs_bmbt_commit_staged_btree(struct xfs_btree_cur *cur,
		struct xfs_trans *tp, int whichfork);

extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
		unsigned long long len);

unsigned int xfs_bmbt_maxlevels_ondisk(void);

int __init xfs_bmbt_init_cur_cache(void);
void xfs_bmbt_destroy_cur_cache(void);

void xfs_bmbt_init_block(struct xfs_inode *ip, struct xfs_btree_block *buf,
		struct xfs_buf *bp, __u16 level, __u16 numrecs);

/*
 * Btree block header size depends on a superblock flag.
 */
static inline size_t
xfs_bmbt_block_len(struct xfs_mount *mp)
{
	return xfs_has_crc(mp) ?
			XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN;
}

/* Addresses of key, pointers, and records within an incore bmbt block. */

static inline struct xfs_bmbt_rec *
xfs_bmbt_rec_addr(
	struct xfs_mount	*mp,
	struct xfs_btree_block	*block,
	unsigned int		index)
{
	return (struct xfs_bmbt_rec *)
		((char *)block + xfs_bmbt_block_len(mp) +
		 (index - 1) * sizeof(struct xfs_bmbt_rec));
}

static inline struct xfs_bmbt_key *
xfs_bmbt_key_addr(
	struct xfs_mount	*mp,
	struct xfs_btree_block	*block,
	unsigned int		index)
{
	return (struct xfs_bmbt_key *)
		((char *)block + xfs_bmbt_block_len(mp) +
		 (index - 1) * sizeof(struct xfs_bmbt_key));
}

static inline xfs_bmbt_ptr_t *

Annotation

Implementation Notes