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