linux/fs/xfs/xfs_extent_busy.h
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   1/*
   2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3 * Copyright (c) 2010 David Chinner.
   4 * Copyright (c) 2011 Christoph Hellwig.
   5 * All Rights Reserved.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it would be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write the Free Software Foundation,
  18 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 */
  20#ifndef __XFS_EXTENT_BUSY_H__
  21#define __XFS_EXTENT_BUSY_H__
  22
  23/*
  24 * Busy block/extent entry.  Indexed by a rbtree in perag to mark blocks that
  25 * have been freed but whose transactions aren't committed to disk yet.
  26 *
  27 * Note that we use the transaction ID to record the transaction, not the
  28 * transaction structure itself. See xfs_extent_busy_insert() for details.
  29 */
  30struct xfs_extent_busy {
  31        struct rb_node  rb_node;        /* ag by-bno indexed search tree */
  32        struct list_head list;          /* transaction busy extent list */
  33        xfs_agnumber_t  agno;
  34        xfs_agblock_t   bno;
  35        xfs_extlen_t    length;
  36        unsigned int    flags;
  37#define XFS_EXTENT_BUSY_DISCARDED       0x01    /* undergoing a discard op. */
  38#define XFS_EXTENT_BUSY_SKIP_DISCARD    0x02    /* do not discard */
  39};
  40
  41void
  42xfs_extent_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno,
  43        xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);
  44
  45void
  46xfs_extent_busy_clear(struct xfs_mount *mp, struct list_head *list,
  47        bool do_discard);
  48
  49int
  50xfs_extent_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno,
  51        xfs_agblock_t bno, xfs_extlen_t len);
  52
  53void
  54xfs_extent_busy_reuse(struct xfs_mount *mp, xfs_agnumber_t agno,
  55        xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata);
  56
  57void
  58xfs_extent_busy_trim(struct xfs_alloc_arg *args, xfs_agblock_t bno,
  59        xfs_extlen_t len, xfs_agblock_t *rbno, xfs_extlen_t *rlen);
  60
  61int
  62xfs_extent_busy_ag_cmp(void *priv, struct list_head *a, struct list_head *b);
  63
  64static inline void xfs_extent_busy_sort(struct list_head *list)
  65{
  66        list_sort(NULL, list, xfs_extent_busy_ag_cmp);
  67}
  68
  69#endif /* __XFS_EXTENT_BUSY_H__ */
  70
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