| 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 | bool abort); |
| 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 | static inline void |
| 123 | xfs_trans_ail_remove( |
| 124 | struct xfs_log_item *lip, |
| 125 | int shutdown_type) |
| 126 | { |
| 127 | struct xfs_ail *ailp = lip->li_ailp; |
| 128 | |
| 129 | spin_lock(&ailp->xa_lock); |
| 130 | /* xfs_trans_ail_delete() drops the AIL lock */ |
| 131 | if (lip->li_flags & XFS_LI_IN_AIL) |
| 132 | xfs_trans_ail_delete(ailp, lip, shutdown_type); |
| 133 | else |
| 134 | spin_unlock(&ailp->xa_lock); |
| 135 | } |
| 136 | |
| 137 | void xfs_ail_push(struct xfs_ail *, xfs_lsn_t); |
| 138 | void xfs_ail_push_all(struct xfs_ail *); |
| 139 | void xfs_ail_push_all_sync(struct xfs_ail *); |
| 140 | struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp); |
| 141 | xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp); |
| 142 | |
| 143 | struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp, |
| 144 | struct xfs_ail_cursor *cur, |
| 145 | xfs_lsn_t lsn); |
| 146 | struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp, |
| 147 | struct xfs_ail_cursor *cur, |
| 148 | xfs_lsn_t lsn); |
| 149 | struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp, |
| 150 | struct xfs_ail_cursor *cur); |
| 151 | void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur); |
| 152 | |
| 153 | #if BITS_PER_LONG != 64 |
| 154 | static inline void |
| 155 | xfs_trans_ail_copy_lsn( |
| 156 | struct xfs_ail *ailp, |
| 157 | xfs_lsn_t *dst, |
| 158 | xfs_lsn_t *src) |
| 159 | { |
| 160 | ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ |
| 161 | spin_lock(&ailp->xa_lock); |
| 162 | *dst = *src; |
| 163 | spin_unlock(&ailp->xa_lock); |
| 164 | } |
| 165 | #else |
| 166 | static inline void |
| 167 | xfs_trans_ail_copy_lsn( |
| 168 | struct xfs_ail *ailp, |
| 169 | xfs_lsn_t *dst, |
| 170 | xfs_lsn_t *src) |
| 171 | { |
| 172 | ASSERT(sizeof(xfs_lsn_t) == 8); |
| 173 | *dst = *src; |
| 174 | } |
| 175 | #endif |
| 176 | #endif /* __XFS_TRANS_PRIV_H__ */ |