mirror of https://gitee.com/openkylin/linux.git
100 lines
3.8 KiB
C
100 lines
3.8 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __XFS_DEFER_H__
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#define __XFS_DEFER_H__
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struct xfs_defer_op_type;
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/*
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* Save a log intent item and a list of extents, so that we can replay
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* whatever action had to happen to the extent list and file the log done
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* item.
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*/
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struct xfs_defer_pending {
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const struct xfs_defer_op_type *dfp_type; /* function pointers */
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struct list_head dfp_list; /* pending items */
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void *dfp_intent; /* log intent item */
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void *dfp_done; /* log done item */
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struct list_head dfp_work; /* work items */
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unsigned int dfp_count; /* # extent items */
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};
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/*
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* Header for deferred operation list.
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*
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* dop_low is used by the allocator to activate the lowspace algorithm -
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* when free space is running low the extent allocator may choose to
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* allocate an extent from an AG without leaving sufficient space for
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* a btree split when inserting the new extent. In this case the allocator
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* will enable the lowspace algorithm which is supposed to allow further
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* allocations (such as btree splits and newroots) to allocate from
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* sequential AGs. In order to avoid locking AGs out of order the lowspace
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* algorithm will start searching for free space from AG 0. If the correct
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* transaction reservations have been made then this algorithm will eventually
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* find all the space it needs.
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*/
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enum xfs_defer_ops_type {
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XFS_DEFER_OPS_TYPE_BMAP,
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XFS_DEFER_OPS_TYPE_REFCOUNT,
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XFS_DEFER_OPS_TYPE_RMAP,
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XFS_DEFER_OPS_TYPE_FREE,
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XFS_DEFER_OPS_TYPE_MAX,
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};
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#define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */
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struct xfs_defer_ops {
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bool dop_committed; /* did any trans commit? */
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bool dop_low; /* alloc in low mode */
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struct list_head dop_intake; /* unlogged pending work */
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struct list_head dop_pending; /* logged pending work */
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/* relog these inodes with each roll */
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struct xfs_inode *dop_inodes[XFS_DEFER_OPS_NR_INODES];
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};
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void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type,
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struct list_head *h);
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int xfs_defer_finish(struct xfs_trans **tp, struct xfs_defer_ops *dop,
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struct xfs_inode *ip);
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void xfs_defer_cancel(struct xfs_defer_ops *dop);
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void xfs_defer_init(struct xfs_defer_ops *dop, xfs_fsblock_t *fbp);
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bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop);
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int xfs_defer_join(struct xfs_defer_ops *dop, struct xfs_inode *ip);
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/* Description of a deferred type. */
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struct xfs_defer_op_type {
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enum xfs_defer_ops_type type;
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unsigned int max_items;
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void (*abort_intent)(void *);
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void *(*create_done)(struct xfs_trans *, void *, unsigned int);
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int (*finish_item)(struct xfs_trans *, struct xfs_defer_ops *,
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struct list_head *, void *, void **);
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void (*finish_cleanup)(struct xfs_trans *, void *, int);
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void (*cancel_item)(struct list_head *);
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int (*diff_items)(void *, struct list_head *, struct list_head *);
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void *(*create_intent)(struct xfs_trans *, uint);
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void (*log_item)(struct xfs_trans *, void *, struct list_head *);
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};
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void xfs_defer_init_op_type(const struct xfs_defer_op_type *type);
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#endif /* __XFS_DEFER_H__ */
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