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