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126 lines
4.3 KiB
126 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2016 Oracle. All Rights Reserved. |
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* Author: Darrick J. Wong <[email protected]> |
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*/ |
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#ifndef __XFS_REFCOUNT_H__ |
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#define __XFS_REFCOUNT_H__ |
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struct xfs_trans; |
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struct xfs_mount; |
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struct xfs_perag; |
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struct xfs_btree_cur; |
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struct xfs_bmbt_irec; |
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struct xfs_refcount_irec; |
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extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur, |
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enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat); |
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extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, |
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enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat); |
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extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur, |
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enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat); |
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extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, |
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struct xfs_refcount_irec *irec, int *stat); |
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static inline uint32_t |
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xfs_refcount_encode_startblock( |
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xfs_agblock_t startblock, |
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enum xfs_refc_domain domain) |
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{ |
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uint32_t start; |
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/* |
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* low level btree operations need to handle the generic btree range |
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* query functions (which set rc_domain == -1U), so we check that the |
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* domain is /not/ shared. |
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*/ |
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start = startblock & ~XFS_REFC_COWFLAG; |
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if (domain != XFS_REFC_DOMAIN_SHARED) |
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start |= XFS_REFC_COWFLAG; |
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return start; |
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} |
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enum xfs_refcount_intent_type { |
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XFS_REFCOUNT_INCREASE = 1, |
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XFS_REFCOUNT_DECREASE, |
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XFS_REFCOUNT_ALLOC_COW, |
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XFS_REFCOUNT_FREE_COW, |
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}; |
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struct xfs_refcount_intent { |
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struct list_head ri_list; |
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enum xfs_refcount_intent_type ri_type; |
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xfs_extlen_t ri_blockcount; |
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xfs_fsblock_t ri_startblock; |
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}; |
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/* Check that the refcount is appropriate for the record domain. */ |
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static inline bool |
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xfs_refcount_check_domain( |
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const struct xfs_refcount_irec *irec) |
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{ |
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if (irec->rc_domain == XFS_REFC_DOMAIN_COW && irec->rc_refcount != 1) |
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return false; |
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if (irec->rc_domain == XFS_REFC_DOMAIN_SHARED && irec->rc_refcount < 2) |
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return false; |
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return true; |
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} |
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void xfs_refcount_increase_extent(struct xfs_trans *tp, |
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struct xfs_bmbt_irec *irec); |
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void xfs_refcount_decrease_extent(struct xfs_trans *tp, |
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struct xfs_bmbt_irec *irec); |
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extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp, |
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struct xfs_btree_cur *rcur, int error); |
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extern int xfs_refcount_finish_one(struct xfs_trans *tp, |
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enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, |
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xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, |
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xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); |
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extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, |
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xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, |
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xfs_extlen_t *flen, bool find_end_of_shared); |
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void xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb, |
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xfs_extlen_t len); |
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void xfs_refcount_free_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb, |
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xfs_extlen_t len); |
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extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, |
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struct xfs_perag *pag); |
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/* |
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* While we're adjusting the refcounts records of an extent, we have |
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* to keep an eye on the number of extents we're dirtying -- run too |
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* many in a single transaction and we'll exceed the transaction's |
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* reservation and crash the fs. Each record adds 12 bytes to the |
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* log (plus any key updates) so we'll conservatively assume 32 bytes |
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* per record. We must also leave space for btree splits on both ends |
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* of the range and space for the CUD and a new CUI. |
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* |
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* Each EFI that we attach to the transaction is assumed to consume ~32 bytes. |
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* This is a low estimate for an EFI tracking a single extent (16 bytes for the |
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* EFI header, 16 for the extent, and 12 for the xlog op header), but the |
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* estimate is acceptable if there's more than one extent being freed. |
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* In the worst case of freeing every other block during a refcount decrease |
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* operation, we amortize the space used for one EFI log item across 16 |
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* extents. |
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*/ |
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#define XFS_REFCOUNT_ITEM_OVERHEAD 32 |
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extern int xfs_refcount_has_record(struct xfs_btree_cur *cur, |
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enum xfs_refc_domain domain, xfs_agblock_t bno, |
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xfs_extlen_t len, bool *exists); |
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union xfs_btree_rec; |
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extern void xfs_refcount_btrec_to_irec(const union xfs_btree_rec *rec, |
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struct xfs_refcount_irec *irec); |
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extern int xfs_refcount_insert(struct xfs_btree_cur *cur, |
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struct xfs_refcount_irec *irec, int *stat); |
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extern struct kmem_cache *xfs_refcount_intent_cache; |
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int __init xfs_refcount_intent_init_cache(void); |
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void xfs_refcount_intent_destroy_cache(void); |
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#endif /* __XFS_REFCOUNT_H__ */
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