1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_TRANS_PRIV_H__ 7 #define __XFS_TRANS_PRIV_H__ 8 9 struct xfs_log_item; 10 struct xfs_mount; 11 struct xfs_trans; 12 struct xfs_ail; 13 struct xfs_log_vec; 14 15 16 void xfs_trans_init(struct xfs_mount *); 17 void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *); 18 void xfs_trans_del_item(struct xfs_log_item *); 19 void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp); 20 21 void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv, 22 xfs_lsn_t commit_lsn, bool aborted); 23 /* 24 * AIL traversal cursor. 25 * 26 * Rather than using a generation number for detecting changes in the ail, use 27 * a cursor that is protected by the ail lock. The aild cursor exists in the 28 * struct xfs_ail, but other traversals can declare it on the stack and link it 29 * to the ail list. 30 * 31 * When an object is deleted from or moved int the AIL, the cursor list is 32 * searched to see if the object is a designated cursor item. If it is, it is 33 * deleted from the cursor so that the next time the cursor is used traversal 34 * will return to the start. 35 * 36 * This means a traversal colliding with a removal will cause a restart of the 37 * list scan, rather than any insertion or deletion anywhere in the list. The 38 * low bit of the item pointer is set if the cursor has been invalidated so 39 * that we can tell the difference between invalidation and reaching the end 40 * of the list to trigger traversal restarts. 41 */ 42 struct xfs_ail_cursor { 43 struct list_head list; 44 struct xfs_log_item *item; 45 }; 46 47 /* 48 * Private AIL structures. 49 * 50 * Eventually we need to drive the locking in here as well. 51 */ 52 struct xfs_ail { 53 struct xfs_mount *ail_mount; 54 struct task_struct *ail_task; 55 struct list_head ail_head; 56 xfs_lsn_t ail_target; 57 xfs_lsn_t ail_target_prev; 58 struct list_head ail_cursors; 59 spinlock_t ail_lock; 60 xfs_lsn_t ail_last_pushed_lsn; 61 int ail_log_flush; 62 struct list_head ail_buf_list; 63 wait_queue_head_t ail_empty; 64 }; 65 66 /* 67 * From xfs_trans_ail.c 68 */ 69 void xfs_trans_ail_update_bulk(struct xfs_ail *ailp, 70 struct xfs_ail_cursor *cur, 71 struct xfs_log_item **log_items, int nr_items, 72 xfs_lsn_t lsn) __releases(ailp->ail_lock); 73 /* 74 * Return a pointer to the first item in the AIL. If the AIL is empty, then 75 * return NULL. 76 */ 77 static inline struct xfs_log_item * 78 xfs_ail_min( 79 struct xfs_ail *ailp) 80 { 81 return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item, 82 li_ail); 83 } 84 85 static inline void 86 xfs_trans_ail_update( 87 struct xfs_ail *ailp, 88 struct xfs_log_item *lip, 89 xfs_lsn_t lsn) __releases(ailp->ail_lock) 90 { 91 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn); 92 } 93 94 xfs_lsn_t xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip); 95 void xfs_ail_update_finish(struct xfs_ail *ailp, xfs_lsn_t old_lsn) 96 __releases(ailp->ail_lock); 97 void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip, 98 int shutdown_type); 99 100 static inline void 101 xfs_trans_ail_remove( 102 struct xfs_log_item *lip, 103 int shutdown_type) 104 { 105 struct xfs_ail *ailp = lip->li_ailp; 106 107 spin_lock(&ailp->ail_lock); 108 /* xfs_trans_ail_delete() drops the AIL lock */ 109 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags)) 110 xfs_trans_ail_delete(ailp, lip, shutdown_type); 111 else 112 spin_unlock(&ailp->ail_lock); 113 } 114 115 void xfs_ail_push(struct xfs_ail *, xfs_lsn_t); 116 void xfs_ail_push_all(struct xfs_ail *); 117 void xfs_ail_push_all_sync(struct xfs_ail *); 118 struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp); 119 xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp); 120 121 struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp, 122 struct xfs_ail_cursor *cur, 123 xfs_lsn_t lsn); 124 struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp, 125 struct xfs_ail_cursor *cur, 126 xfs_lsn_t lsn); 127 struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp, 128 struct xfs_ail_cursor *cur); 129 void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur); 130 131 #if BITS_PER_LONG != 64 132 static inline void 133 xfs_trans_ail_copy_lsn( 134 struct xfs_ail *ailp, 135 xfs_lsn_t *dst, 136 xfs_lsn_t *src) 137 { 138 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ 139 spin_lock(&ailp->ail_lock); 140 *dst = *src; 141 spin_unlock(&ailp->ail_lock); 142 } 143 #else 144 static inline void 145 xfs_trans_ail_copy_lsn( 146 struct xfs_ail *ailp, 147 xfs_lsn_t *dst, 148 xfs_lsn_t *src) 149 { 150 ASSERT(sizeof(xfs_lsn_t) == 8); 151 *dst = *src; 152 } 153 #endif 154 155 static inline void 156 xfs_clear_li_failed( 157 struct xfs_log_item *lip) 158 { 159 struct xfs_buf *bp = lip->li_buf; 160 161 ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags)); 162 lockdep_assert_held(&lip->li_ailp->ail_lock); 163 164 if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) { 165 lip->li_buf = NULL; 166 xfs_buf_rele(bp); 167 } 168 } 169 170 static inline void 171 xfs_set_li_failed( 172 struct xfs_log_item *lip, 173 struct xfs_buf *bp) 174 { 175 lockdep_assert_held(&lip->li_ailp->ail_lock); 176 177 if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) { 178 xfs_buf_hold(bp); 179 lip->li_buf = bp; 180 } 181 } 182 183 #endif /* __XFS_TRANS_PRIV_H__ */ 184