18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0+ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2016 Oracle. All Rights Reserved. 48c2ecf20Sopenharmony_ci * Author: Darrick J. Wong <darrick.wong@oracle.com> 58c2ecf20Sopenharmony_ci */ 68c2ecf20Sopenharmony_ci#ifndef __XFS_REFCOUNT_H__ 78c2ecf20Sopenharmony_ci#define __XFS_REFCOUNT_H__ 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ciextern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur, 108c2ecf20Sopenharmony_ci xfs_agblock_t bno, int *stat); 118c2ecf20Sopenharmony_ciextern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, 128c2ecf20Sopenharmony_ci xfs_agblock_t bno, int *stat); 138c2ecf20Sopenharmony_ciextern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur, 148c2ecf20Sopenharmony_ci xfs_agblock_t bno, int *stat); 158c2ecf20Sopenharmony_ciextern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, 168c2ecf20Sopenharmony_ci struct xfs_refcount_irec *irec, int *stat); 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_cienum xfs_refcount_intent_type { 198c2ecf20Sopenharmony_ci XFS_REFCOUNT_INCREASE = 1, 208c2ecf20Sopenharmony_ci XFS_REFCOUNT_DECREASE, 218c2ecf20Sopenharmony_ci XFS_REFCOUNT_ALLOC_COW, 228c2ecf20Sopenharmony_ci XFS_REFCOUNT_FREE_COW, 238c2ecf20Sopenharmony_ci}; 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_cistruct xfs_refcount_intent { 268c2ecf20Sopenharmony_ci struct list_head ri_list; 278c2ecf20Sopenharmony_ci enum xfs_refcount_intent_type ri_type; 288c2ecf20Sopenharmony_ci xfs_fsblock_t ri_startblock; 298c2ecf20Sopenharmony_ci xfs_extlen_t ri_blockcount; 308c2ecf20Sopenharmony_ci}; 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_civoid xfs_refcount_increase_extent(struct xfs_trans *tp, 338c2ecf20Sopenharmony_ci struct xfs_bmbt_irec *irec); 348c2ecf20Sopenharmony_civoid xfs_refcount_decrease_extent(struct xfs_trans *tp, 358c2ecf20Sopenharmony_ci struct xfs_bmbt_irec *irec); 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ciextern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp, 388c2ecf20Sopenharmony_ci struct xfs_btree_cur *rcur, int error); 398c2ecf20Sopenharmony_ciextern int xfs_refcount_finish_one(struct xfs_trans *tp, 408c2ecf20Sopenharmony_ci enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, 418c2ecf20Sopenharmony_ci xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, 428c2ecf20Sopenharmony_ci xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ciextern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, 458c2ecf20Sopenharmony_ci xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, 468c2ecf20Sopenharmony_ci xfs_extlen_t *flen, bool find_end_of_shared); 478c2ecf20Sopenharmony_ci 488c2ecf20Sopenharmony_civoid xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb, 498c2ecf20Sopenharmony_ci xfs_extlen_t len); 508c2ecf20Sopenharmony_civoid xfs_refcount_free_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb, 518c2ecf20Sopenharmony_ci xfs_extlen_t len); 528c2ecf20Sopenharmony_ciextern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, 538c2ecf20Sopenharmony_ci xfs_agnumber_t agno); 548c2ecf20Sopenharmony_ci 558c2ecf20Sopenharmony_ci/* 568c2ecf20Sopenharmony_ci * While we're adjusting the refcounts records of an extent, we have 578c2ecf20Sopenharmony_ci * to keep an eye on the number of extents we're dirtying -- run too 588c2ecf20Sopenharmony_ci * many in a single transaction and we'll exceed the transaction's 598c2ecf20Sopenharmony_ci * reservation and crash the fs. Each record adds 12 bytes to the 608c2ecf20Sopenharmony_ci * log (plus any key updates) so we'll conservatively assume 32 bytes 618c2ecf20Sopenharmony_ci * per record. We must also leave space for btree splits on both ends 628c2ecf20Sopenharmony_ci * of the range and space for the CUD and a new CUI. 638c2ecf20Sopenharmony_ci */ 648c2ecf20Sopenharmony_ci#define XFS_REFCOUNT_ITEM_OVERHEAD 32 658c2ecf20Sopenharmony_ci 668c2ecf20Sopenharmony_cistatic inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res) 678c2ecf20Sopenharmony_ci{ 688c2ecf20Sopenharmony_ci return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD; 698c2ecf20Sopenharmony_ci} 708c2ecf20Sopenharmony_ci 718c2ecf20Sopenharmony_ciextern int xfs_refcount_has_record(struct xfs_btree_cur *cur, 728c2ecf20Sopenharmony_ci xfs_agblock_t bno, xfs_extlen_t len, bool *exists); 738c2ecf20Sopenharmony_ciunion xfs_btree_rec; 748c2ecf20Sopenharmony_ciextern void xfs_refcount_btrec_to_irec(union xfs_btree_rec *rec, 758c2ecf20Sopenharmony_ci struct xfs_refcount_irec *irec); 768c2ecf20Sopenharmony_ciextern int xfs_refcount_insert(struct xfs_btree_cur *cur, 778c2ecf20Sopenharmony_ci struct xfs_refcount_irec *irec, int *stat); 788c2ecf20Sopenharmony_ci 798c2ecf20Sopenharmony_ci#endif /* __XFS_REFCOUNT_H__ */ 80