mirror of
https://github.com/torvalds/linux.git
synced 2024-12-19 09:32:32 +00:00
d12bf8bac8
Implement ranged queries for refcount records. The next patch will use this to scan refcount data. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2016 Oracle. All Rights Reserved.
|
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
|
*/
|
|
#ifndef __XFS_REFCOUNT_H__
|
|
#define __XFS_REFCOUNT_H__
|
|
|
|
struct xfs_trans;
|
|
struct xfs_mount;
|
|
struct xfs_perag;
|
|
struct xfs_btree_cur;
|
|
struct xfs_bmbt_irec;
|
|
struct xfs_refcount_irec;
|
|
|
|
extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur,
|
|
enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
|
|
extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
|
|
enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
|
|
extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur,
|
|
enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
|
|
extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
|
|
struct xfs_refcount_irec *irec, int *stat);
|
|
|
|
static inline uint32_t
|
|
xfs_refcount_encode_startblock(
|
|
xfs_agblock_t startblock,
|
|
enum xfs_refc_domain domain)
|
|
{
|
|
uint32_t start;
|
|
|
|
/*
|
|
* low level btree operations need to handle the generic btree range
|
|
* query functions (which set rc_domain == -1U), so we check that the
|
|
* domain is /not/ shared.
|
|
*/
|
|
start = startblock & ~XFS_REFC_COWFLAG;
|
|
if (domain != XFS_REFC_DOMAIN_SHARED)
|
|
start |= XFS_REFC_COWFLAG;
|
|
|
|
return start;
|
|
}
|
|
|
|
enum xfs_refcount_intent_type {
|
|
XFS_REFCOUNT_INCREASE = 1,
|
|
XFS_REFCOUNT_DECREASE,
|
|
XFS_REFCOUNT_ALLOC_COW,
|
|
XFS_REFCOUNT_FREE_COW,
|
|
};
|
|
|
|
struct xfs_refcount_intent {
|
|
struct list_head ri_list;
|
|
struct xfs_perag *ri_pag;
|
|
enum xfs_refcount_intent_type ri_type;
|
|
xfs_extlen_t ri_blockcount;
|
|
xfs_fsblock_t ri_startblock;
|
|
};
|
|
|
|
/* Check that the refcount is appropriate for the record domain. */
|
|
static inline bool
|
|
xfs_refcount_check_domain(
|
|
const struct xfs_refcount_irec *irec)
|
|
{
|
|
if (irec->rc_domain == XFS_REFC_DOMAIN_COW && irec->rc_refcount != 1)
|
|
return false;
|
|
if (irec->rc_domain == XFS_REFC_DOMAIN_SHARED && irec->rc_refcount < 2)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
void xfs_refcount_update_get_group(struct xfs_mount *mp,
|
|
struct xfs_refcount_intent *ri);
|
|
|
|
void xfs_refcount_increase_extent(struct xfs_trans *tp,
|
|
struct xfs_bmbt_irec *irec);
|
|
void xfs_refcount_decrease_extent(struct xfs_trans *tp,
|
|
struct xfs_bmbt_irec *irec);
|
|
|
|
extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp,
|
|
struct xfs_btree_cur *rcur, int error);
|
|
extern int xfs_refcount_finish_one(struct xfs_trans *tp,
|
|
struct xfs_refcount_intent *ri, struct xfs_btree_cur **pcur);
|
|
|
|
extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur,
|
|
xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno,
|
|
xfs_extlen_t *flen, bool find_end_of_shared);
|
|
|
|
void xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb,
|
|
xfs_extlen_t len);
|
|
void xfs_refcount_free_cow_extent(struct xfs_trans *tp, xfs_fsblock_t fsb,
|
|
xfs_extlen_t len);
|
|
extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp,
|
|
struct xfs_perag *pag);
|
|
|
|
/*
|
|
* While we're adjusting the refcounts records of an extent, we have
|
|
* to keep an eye on the number of extents we're dirtying -- run too
|
|
* many in a single transaction and we'll exceed the transaction's
|
|
* reservation and crash the fs. Each record adds 12 bytes to the
|
|
* log (plus any key updates) so we'll conservatively assume 32 bytes
|
|
* per record. We must also leave space for btree splits on both ends
|
|
* of the range and space for the CUD and a new CUI.
|
|
*
|
|
* Each EFI that we attach to the transaction is assumed to consume ~32 bytes.
|
|
* This is a low estimate for an EFI tracking a single extent (16 bytes for the
|
|
* EFI header, 16 for the extent, and 12 for the xlog op header), but the
|
|
* estimate is acceptable if there's more than one extent being freed.
|
|
* In the worst case of freeing every other block during a refcount decrease
|
|
* operation, we amortize the space used for one EFI log item across 16
|
|
* extents.
|
|
*/
|
|
#define XFS_REFCOUNT_ITEM_OVERHEAD 32
|
|
|
|
extern int xfs_refcount_has_records(struct xfs_btree_cur *cur,
|
|
enum xfs_refc_domain domain, xfs_agblock_t bno,
|
|
xfs_extlen_t len, enum xbtree_recpacking *outcome);
|
|
union xfs_btree_rec;
|
|
extern void xfs_refcount_btrec_to_irec(const union xfs_btree_rec *rec,
|
|
struct xfs_refcount_irec *irec);
|
|
xfs_failaddr_t xfs_refcount_check_irec(struct xfs_perag *pag,
|
|
const struct xfs_refcount_irec *irec);
|
|
extern int xfs_refcount_insert(struct xfs_btree_cur *cur,
|
|
struct xfs_refcount_irec *irec, int *stat);
|
|
|
|
extern struct kmem_cache *xfs_refcount_intent_cache;
|
|
|
|
int __init xfs_refcount_intent_init_cache(void);
|
|
void xfs_refcount_intent_destroy_cache(void);
|
|
|
|
typedef int (*xfs_refcount_query_range_fn)(
|
|
struct xfs_btree_cur *cur,
|
|
const struct xfs_refcount_irec *rec,
|
|
void *priv);
|
|
|
|
int xfs_refcount_query_range(struct xfs_btree_cur *cur,
|
|
const struct xfs_refcount_irec *low_rec,
|
|
const struct xfs_refcount_irec *high_rec,
|
|
xfs_refcount_query_range_fn fn, void *priv);
|
|
|
|
#endif /* __XFS_REFCOUNT_H__ */
|