libxfs/xfs_defer.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #ifndef __XFS_DEFER_H__
   7 #define __XFS_DEFER_H__
   8
   9 struct xfs_defer_op_type;
  10
  11 /*
  12  * Header for deferred operation list.
  13  */
  14 enum xfs_defer_ops_type {
  15         XFS_DEFER_OPS_TYPE_BMAP,
  16         XFS_DEFER_OPS_TYPE_REFCOUNT,
  17         XFS_DEFER_OPS_TYPE_RMAP,
  18         XFS_DEFER_OPS_TYPE_FREE,
  19         XFS_DEFER_OPS_TYPE_AGFL_FREE,
  20         XFS_DEFER_OPS_TYPE_MAX,
  21 };
  22
  23 /*
  24  * Save a log intent item and a list of extents, so that we can replay
  25  * whatever action had to happen to the extent list and file the log done
  26  * item.
  27  */
  28 struct xfs_defer_pending {
  29         struct list_head                dfp_list;       /* pending items */
  30         struct list_head                dfp_work;       /* work items */
  31         void                            *dfp_intent;    /* log intent item */
  32         void                            *dfp_done;      /* log done item */
  33         unsigned int                    dfp_count;      /* # extent items */
  34         enum xfs_defer_ops_type         dfp_type;
  35 };
  36
  37 void xfs_defer_add(struct xfs_trans *tp, enum xfs_defer_ops_type type,
  38                 struct list_head *h);
  39 int xfs_defer_finish_noroll(struct xfs_trans **tp);
  40 int xfs_defer_finish(struct xfs_trans **tp);
  41 void xfs_defer_cancel(struct xfs_trans *);
  42 void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
  43
  44 /* Description of a deferred type. */
  45 struct xfs_defer_op_type {
  46         void (*abort_intent)(void *);
  47         void *(*create_done)(struct xfs_trans *, void *, unsigned int);
  48         int (*finish_item)(struct xfs_trans *, struct list_head *, void *,
  49                         void **);
  50         void (*finish_cleanup)(struct xfs_trans *, void *, int);
  51         void (*cancel_item)(struct list_head *);
  52         int (*diff_items)(void *, struct list_head *, struct list_head *);
  53         void *(*create_intent)(struct xfs_trans *, uint);
  54         void (*log_item)(struct xfs_trans *, void *, struct list_head *);
  55         unsigned int            max_items;
  56 };
  57
  58 extern const struct xfs_defer_op_type xfs_bmap_update_defer_type;
  59 extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
  60 extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
  61 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
  62 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
  63
  64 #endif /* __XFS_DEFER_H__ */