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 26 /* 27 * From xfs_trans_item.c 28 */ 29 struct xfs_log_item_desc *xfs_trans_add_item(struct xfs_trans *, 30 struct xfs_log_item *); 31 void xfs_trans_free_item(struct xfs_trans *, 32 struct xfs_log_item_desc *); 33 struct xfs_log_item_desc *xfs_trans_find_item(struct xfs_trans *, 34 struct xfs_log_item *); 35 struct xfs_log_item_desc *xfs_trans_first_item(struct xfs_trans *); 36 struct xfs_log_item_desc *xfs_trans_next_item(struct xfs_trans *, 37 struct xfs_log_item_desc *); 38 void xfs_trans_free_items(struct xfs_trans *, int); 39 void xfs_trans_unlock_items(struct xfs_trans *, 40 xfs_lsn_t); 41 void xfs_trans_free_busy(xfs_trans_t *tp); 42 xfs_log_busy_slot_t *xfs_trans_add_busy(xfs_trans_t *tp, 43 xfs_agnumber_t ag, 44 xfs_extlen_t idx); 45 46 /* 47 * AIL traversal cursor. 48 * 49 * Rather than using a generation number for detecting changes in the ail, use 50 * a cursor that is protected by the ail lock. The aild cursor exists in the 51 * struct xfs_ail, but other traversals can declare it on the stack and link it 52 * to the ail list. 53 * 54 * When an object is deleted from or moved int the AIL, the cursor list is 55 * searched to see if the object is a designated cursor item. If it is, it is 56 * deleted from the cursor so that the next time the cursor is used traversal 57 * will return to the start. 58 * 59 * This means a traversal colliding with a removal will cause a restart of the 60 * list scan, rather than any insertion or deletion anywhere in the list. The 61 * low bit of the item pointer is set if the cursor has been invalidated so 62 * that we can tell the difference between invalidation and reaching the end 63 * of the list to trigger traversal restarts. 64 */ 65 struct xfs_ail_cursor { 66 struct xfs_ail_cursor *next; 67 struct xfs_log_item *item; 68 }; 69 70 /* 71 * Private AIL structures. 72 * 73 * Eventually we need to drive the locking in here as well. 74 */ 75 struct xfs_ail { 76 struct xfs_mount *xa_mount; 77 struct list_head xa_ail; 78 uint xa_gen; 79 struct task_struct *xa_task; 80 xfs_lsn_t xa_target; 81 struct xfs_ail_cursor xa_cursors; 82 spinlock_t xa_lock; 83 }; 84 85 /* 86 * From xfs_trans_ail.c 87 */ 88 void xfs_trans_ail_update(struct xfs_ail *ailp, 89 struct xfs_log_item *lip, xfs_lsn_t lsn) 90 __releases(ailp->xa_lock); 91 void xfs_trans_ail_delete(struct xfs_ail *ailp, 92 struct xfs_log_item *lip) 93 __releases(ailp->xa_lock); 94 void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t); 95 void xfs_trans_unlocked_item(struct xfs_ail *, 96 xfs_log_item_t *); 97 98 xfs_lsn_t xfs_trans_ail_tail(struct xfs_ail *ailp); 99 100 struct xfs_log_item *xfs_trans_ail_cursor_first(struct xfs_ail *ailp, 101 struct xfs_ail_cursor *cur, 102 xfs_lsn_t lsn); 103 struct xfs_log_item *xfs_trans_ail_cursor_next(struct xfs_ail *ailp, 104 struct xfs_ail_cursor *cur); 105 void xfs_trans_ail_cursor_done(struct xfs_ail *ailp, 106 struct xfs_ail_cursor *cur); 107 108 long xfsaild_push(struct xfs_ail *, xfs_lsn_t *); 109 void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t); 110 int xfsaild_start(struct xfs_ail *); 111 void xfsaild_stop(struct xfs_ail *); 112 113 #if BITS_PER_LONG != 64 114 static inline void 115 xfs_trans_ail_copy_lsn( 116 struct xfs_ail *ailp, 117 xfs_lsn_t *dst, 118 xfs_lsn_t *src) 119 { 120 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ 121 spin_lock(&ailp->xa_lock); 122 *dst = *src; 123 spin_unlock(&ailp->xa_lock); 124 } 125 #else 126 static inline void 127 xfs_trans_ail_copy_lsn( 128 struct xfs_ail *ailp, 129 xfs_lsn_t *dst, 130 xfs_lsn_t *src) 131 { 132 ASSERT(sizeof(xfs_lsn_t) == 8); 133 *dst = *src; 134 } 135 #endif 136 #endif /* __XFS_TRANS_PRIV_H__ */ 137