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
  29 void    xfs_trans_init(struct xfs_mount *);
  30 void    xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
  31 void    xfs_trans_del_item(struct xfs_log_item *);
  32 void    xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
  33                                 int flags);
  34 void    xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
  35
  36 void    xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
  37                                 xfs_lsn_t commit_lsn, int aborted);
  38 /*
  39  * AIL traversal cursor.
  40  *
  41  * Rather than using a generation number for detecting changes in the ail, use
  42  * a cursor that is protected by the ail lock. The aild cursor exists in the
  43  * struct xfs_ail, but other traversals can declare it on the stack and link it
  44  * to the ail list.
  45  *
  46  * When an object is deleted from or moved int the AIL, the cursor list is
  47  * searched to see if the object is a designated cursor item. If it is, it is
  48  * deleted from the cursor so that the next time the cursor is used traversal
  49  * will return to the start.
  50  *
  51  * This means a traversal colliding with a removal will cause a restart of the
  52  * list scan, rather than any insertion or deletion anywhere in the list. The
  53  * low bit of the item pointer is set if the cursor has been invalidated so
  54  * that we can tell the difference between invalidation and reaching the end
  55  * of the list to trigger traversal restarts.
  56  */
  57 struct xfs_ail_cursor {
  58         struct list_head        list;
  59         struct xfs_log_item     *item;
  60 };
  61
  62 /*
  63  * Private AIL structures.
  64  *
  65  * Eventually we need to drive the locking in here as well.
  66  */
  67 struct xfs_ail {
  68         struct xfs_mount        *xa_mount;
  69         struct task_struct      *xa_task;
  70         struct list_head        xa_ail;
  71         xfs_lsn_t               xa_target;
  72         xfs_lsn_t               xa_target_prev;
  73         struct list_head        xa_cursors;
  74         spinlock_t              xa_lock;
  75         xfs_lsn_t               xa_last_pushed_lsn;
  76         int                     xa_log_flush;
  77         struct list_head        xa_buf_list;
  78         wait_queue_head_t       xa_empty;
  79 };
  80
  81 /*
  82  * From xfs_trans_ail.c
  83  */
  84 void    xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
  85                                 struct xfs_ail_cursor *cur,
  86                                 struct xfs_log_item **log_items, int nr_items,
  87                                 xfs_lsn_t lsn) __releases(ailp->xa_lock);
  88 /*
  89  * Return a pointer to the first item in the AIL.  If the AIL is empty, then
  90  * return NULL.
  91  */
  92 static inline struct xfs_log_item *
  93 xfs_ail_min(
  94         struct xfs_ail  *ailp)
  95 {
  96         return list_first_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
  97                                         li_ail);
  98 }
  99
 100 static inline void
 101 xfs_trans_ail_update(
 102         struct xfs_ail          *ailp,
 103         struct xfs_log_item     *lip,
 104         xfs_lsn_t               lsn) __releases(ailp->xa_lock)
 105 {
 106         xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
 107 }
 108
 109 void    xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
 110                                 struct xfs_log_item **log_items, int nr_items,
 111                                 int shutdown_type)
 112                                 __releases(ailp->xa_lock);
 113 static inline void
 114 xfs_trans_ail_delete(
 115         struct xfs_ail  *ailp,
 116         xfs_log_item_t  *lip,
 117         int             shutdown_type) __releases(ailp->xa_lock)
 118 {
 119         xfs_trans_ail_delete_bulk(ailp, &lip, 1, shutdown_type);
 120 }
 121
 122 void                    xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
 123 void                    xfs_ail_push_all(struct xfs_ail *);
 124 void                    xfs_ail_push_all_sync(struct xfs_ail *);
 125 struct xfs_log_item     *xfs_ail_min(struct xfs_ail  *ailp);
 126 xfs_lsn_t               xfs_ail_min_lsn(struct xfs_ail *ailp);
 127
 128 struct xfs_log_item *   xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
 129                                         struct xfs_ail_cursor *cur,
 130                                         xfs_lsn_t lsn);
 131 struct xfs_log_item *   xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
 132                                         struct xfs_ail_cursor *cur,
 133                                         xfs_lsn_t lsn);
 134 struct xfs_log_item *   xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
 135                                         struct xfs_ail_cursor *cur);
 136 void                    xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
 137
 138 #if BITS_PER_LONG != 64
 139 static inline void
 140 xfs_trans_ail_copy_lsn(
 141         struct xfs_ail  *ailp,
 142         xfs_lsn_t       *dst,
 143         xfs_lsn_t       *src)
 144 {
 145         ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
 146         spin_lock(&ailp->xa_lock);
 147         *dst = *src;
 148         spin_unlock(&ailp->xa_lock);
 149 }
 150 #else
 151 static inline void
 152 xfs_trans_ail_copy_lsn(
 153         struct xfs_ail  *ailp,
 154         xfs_lsn_t       *dst,
 155         xfs_lsn_t       *src)
 156 {
 157         ASSERT(sizeof(xfs_lsn_t) == 8);
 158         *dst = *src;
 159 }
 160 #endif
 161 #endif  /* __XFS_TRANS_PRIV_H__ */