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