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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2021 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#ifndef __XFS_RTRMAP_BTREE_H__
#define __XFS_RTRMAP_BTREE_H__
struct xfs_buf;
struct xfs_btree_cur;
struct xfs_mount;
struct xbtree_ifakeroot;
/* rmaps only exist on crc enabled filesystems */
#define XFS_RTRMAP_BLOCK_LEN XFS_BTREE_LBLOCK_CRC_LEN
struct xfs_btree_cur *xfs_rtrmapbt_init_cursor(struct xfs_mount *mp,
struct xfs_trans *tp, struct xfs_inode *ip);
struct xfs_btree_cur *xfs_rtrmapbt_stage_cursor(struct xfs_mount *mp,
struct xfs_inode *ip, struct xbtree_ifakeroot *ifake);
void xfs_rtrmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
struct xfs_trans *tp);
unsigned int xfs_rtrmapbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
bool leaf);
unsigned int xfs_rtrmapbt_compute_maxlevels(struct xfs_mount *mp,
xfs_rfsblock_t dblocks, xfs_rfsblock_t rblocks);
unsigned int xfs_rtrmapbt_droot_maxrecs(unsigned int blocklen, bool leaf);
/*
* Addresses of records, keys, and pointers within an incore rtrmapbt block.
*
* (note that some of these may appear unused, but they are used in userspace)
*/
static inline struct xfs_rtrmap_rec *
xfs_rtrmap_rec_addr(
struct xfs_btree_block *block,
unsigned int index)
{
return (struct xfs_rtrmap_rec *)
((char *)block + XFS_RTRMAP_BLOCK_LEN +
(index - 1) * sizeof(struct xfs_rtrmap_rec));
}
static inline struct xfs_rtrmap_key *
xfs_rtrmap_key_addr(
struct xfs_btree_block *block,
unsigned int index)
{
return (struct xfs_rtrmap_key *)
((char *)block + XFS_RTRMAP_BLOCK_LEN +
(index - 1) * 2 * sizeof(struct xfs_rtrmap_key));
}
static inline struct xfs_rtrmap_key *
xfs_rtrmap_high_key_addr(
struct xfs_btree_block *block,
unsigned int index)
{
return (struct xfs_rtrmap_key *)
((char *)block + XFS_RTRMAP_BLOCK_LEN +
sizeof(struct xfs_rtrmap_key) +
(index - 1) * 2 * sizeof(struct xfs_rtrmap_key));
}
static inline xfs_rtrmap_ptr_t *
xfs_rtrmap_ptr_addr(
struct xfs_btree_block *block,
unsigned int index,
unsigned int maxrecs)
{
return (xfs_rtrmap_ptr_t *)
((char *)block + XFS_RTRMAP_BLOCK_LEN +
maxrecs * 2 * sizeof(struct xfs_rtrmap_key) +
(index - 1) * sizeof(xfs_rtrmap_ptr_t));
}
int __init xfs_rtrmapbt_create_cursor_cache(void);
xfs_filblks_t xfs_rtrmapbt_calc_reserves(struct xfs_mount *mp);
/* Addresses of key, pointers, and records within an ondisk rtrmapbt block. */
static inline struct xfs_rtrmap_rec *
xfs_rtrmap_droot_rec_addr(
struct xfs_rtrmap_root *block,
unsigned int index)
{
return (struct xfs_rtrmap_rec *)
((char *)(block + 1) +
(index - 1) * sizeof(struct xfs_rtrmap_rec));
}
static inline struct xfs_rtrmap_key *
xfs_rtrmap_droot_key_addr(
struct xfs_rtrmap_root *block,
unsigned int index)
{
return (struct xfs_rtrmap_key *)
((char *)(block + 1) +
(index - 1) * 2 * sizeof(struct xfs_rtrmap_key));
}
static inline xfs_rtrmap_ptr_t *
xfs_rtrmap_droot_ptr_addr(
struct xfs_rtrmap_root *block,
unsigned int index,
unsigned int maxrecs)
{
return (xfs_rtrmap_ptr_t *)
((char *)(block + 1) +
maxrecs * 2 * sizeof(struct xfs_rtrmap_key) +
(index - 1) * sizeof(xfs_rtrmap_ptr_t));
}
/*
* Address of pointers within the incore btree root.
*
* These are to be used when we know the size of the block and
* we don't have a cursor.
*/
static inline xfs_rtrmap_ptr_t *
xfs_rtrmap_broot_ptr_addr(
struct xfs_mount *mp,
struct xfs_btree_block *bb,
unsigned int index,
unsigned int block_size)
{
return xfs_rtrmap_ptr_addr(bb, index,
xfs_rtrmapbt_maxrecs(mp, block_size, false));
}
/*
* Compute the space required for the incore btree root containing the given
* number of records.
*/
static inline size_t
xfs_rtrmap_broot_space_calc(
struct xfs_mount *mp,
unsigned int level,
unsigned int nrecs)
{
size_t sz = XFS_RTRMAP_BLOCK_LEN;
if (level > 0)
return sz + nrecs * (2 * sizeof(struct xfs_rtrmap_key) +
sizeof(xfs_rtrmap_ptr_t));
return sz + nrecs * sizeof(struct xfs_rtrmap_rec);
}
/*
* Compute the space required for the incore btree root given the ondisk
* btree root block.
*/
static inline size_t
xfs_rtrmap_broot_space(struct xfs_mount *mp, struct xfs_rtrmap_root *bb)
{
return xfs_rtrmap_broot_space_calc(mp, be16_to_cpu(bb->bb_level),
be16_to_cpu(bb->bb_numrecs));
}
/* Compute the space required for the ondisk root block. */
static inline size_t
xfs_rtrmap_droot_space_calc(
unsigned int level,
unsigned int nrecs)
{
size_t sz = sizeof(struct xfs_rtrmap_root);
if (level > 0)
return sz + nrecs * (2 * sizeof(struct xfs_rtrmap_key) +
sizeof(xfs_rtrmap_ptr_t));
return sz + nrecs * sizeof(struct xfs_rtrmap_rec);
}
/*
* Compute the space required for the ondisk root block given an incore root
* block.
*/
static inline size_t
xfs_rtrmap_droot_space(struct xfs_btree_block *bb)
{
return xfs_rtrmap_droot_space_calc(be16_to_cpu(bb->bb_level),
be16_to_cpu(bb->bb_numrecs));
}
int xfs_iformat_rtrmap(struct xfs_inode *ip, struct xfs_dinode *dip);
void xfs_rtrmapbt_to_disk(struct xfs_mount *mp, struct xfs_btree_block *rblock,
unsigned int rblocklen, struct xfs_rtrmap_root *dblock,
unsigned int dblocklen);
void xfs_iflush_rtrmap(struct xfs_inode *ip, struct xfs_dinode *dip);
struct xfs_imeta_end;
int xfs_rtrmapbt_create(struct xfs_trans **tpp, struct xfs_imeta_end *ic,
struct xfs_inode **ipp);
#endif /* __XFS_RTRMAP_BTREE_H__ */
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