fs/xfs/xfs_trans_priv.h

   1 /*
   2  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_TRANS_PRIV_H__
  19 #define __XFS_TRANS_PRIV_H__
  20
  21 struct xfs_log_item;
  22 struct xfs_log_item_desc;
  23 struct xfs_mount;
  24 struct xfs_trans;
  25 struct xfs_ail;
  26 struct xfs_log_vec;
  27
  28 void    xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
  29 void    xfs_trans_del_item(struct xfs_log_item *);
  30 void    xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
  31                                 int flags);
  32 void    xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
  33
  34 void    xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
  35                                 xfs_lsn_t commit_lsn, int aborted);
  36 /*
  37  * AIL traversal cursor.
  38  *
  39  * Rather than using a generation number for detecting changes in the ail, use
  40  * a cursor that is protected by the ail lock. The aild cursor exists in the
  41  * struct xfs_ail, but other traversals can declare it on the stack and link it
  42  * to the ail list.
  43  *
  44  * When an object is deleted from or moved int the AIL, the cursor list is
  45  * searched to see if the object is a designated cursor item. If it is, it is
  46  * deleted from the cursor so that the next time the cursor is used traversal
  47  * will return to the start.
  48  *
  49  * This means a traversal colliding with a removal will cause a restart of the
  50  * list scan, rather than any insertion or deletion anywhere in the list. The
  51  * low bit of the item pointer is set if the cursor has been invalidated so
  52  * that we can tell the difference between invalidation and reaching the end
  53  * of the list to trigger traversal restarts.
  54  */
  55 struct xfs_ail_cursor {
  56         struct list_head        list;
  57         struct xfs_log_item     *item;
  58 };
  59
  60 /*
  61  * Private AIL structures.
  62  *
  63  * Eventually we need to drive the locking in here as well.
  64  */
  65 struct xfs_ail {
  66         struct xfs_mount        *xa_mount;
  67         struct task_struct      *xa_task;
  68         struct list_head        xa_ail;
  69         xfs_lsn_t               xa_target;
  70         struct list_head        xa_cursors;
  71         spinlock_t              xa_lock;
  72         xfs_lsn_t               xa_last_pushed_lsn;
  73         int                     xa_log_flush;
  74 };
  75
  76 /*
  77  * From xfs_trans_ail.c
  78  */
  79 void    xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
  80                                 struct xfs_ail_cursor *cur,
  81                                 struct xfs_log_item **log_items, int nr_items,
  82                                 xfs_lsn_t lsn) __releases(ailp->xa_lock);
  83 static inline void
  84 xfs_trans_ail_update(
  85         struct xfs_ail          *ailp,
  86         struct xfs_log_item     *lip,
  87         xfs_lsn_t               lsn) __releases(ailp->xa_lock)
  88 {
  89         xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
  90 }
  91
  92 void    xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
  93                                 struct xfs_log_item **log_items, int nr_items)
  94                                 __releases(ailp->xa_lock);
  95 static inline void
  96 xfs_trans_ail_delete(
  97         struct xfs_ail  *ailp,
  98         xfs_log_item_t  *lip) __releases(ailp->xa_lock)
  99 {
 100         xfs_trans_ail_delete_bulk(ailp, &lip, 1);
 101 }
 102
 103 void                    xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
 104 void                    xfs_ail_push_all(struct xfs_ail *);
 105 xfs_lsn_t               xfs_ail_min_lsn(struct xfs_ail *ailp);
 106
 107 struct xfs_log_item *   xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
 108                                         struct xfs_ail_cursor *cur,
 109                                         xfs_lsn_t lsn);
 110 struct xfs_log_item *   xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
 111                                         struct xfs_ail_cursor *cur,
 112                                         xfs_lsn_t lsn);
 113 struct xfs_log_item *   xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
 114                                         struct xfs_ail_cursor *cur);
 115 void                    xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
 116                                         struct xfs_ail_cursor *cur);
 117
 118 #if BITS_PER_LONG != 64
 119 static inline void
 120 xfs_trans_ail_copy_lsn(
 121         struct xfs_ail  *ailp,
 122         xfs_lsn_t       *dst,
 123         xfs_lsn_t       *src)
 124 {
 125         ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
 126         spin_lock(&ailp->xa_lock);
 127         *dst = *src;
 128         spin_unlock(&ailp->xa_lock);
 129 }
 130 #else
 131 static inline void
 132 xfs_trans_ail_copy_lsn(
 133         struct xfs_ail  *ailp,
 134         xfs_lsn_t       *dst,
 135         xfs_lsn_t       *src)
 136 {
 137         ASSERT(sizeof(xfs_lsn_t) == 8);
 138         *dst = *src;
 139 }
 140 #endif
 141 #endif  /* __XFS_TRANS_PRIV_H__ */