182 строки
4.8 KiB
C
182 строки
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_TRANS_PRIV_H__
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#define __XFS_TRANS_PRIV_H__
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struct xfs_log_item;
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_ail;
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struct xfs_log_vec;
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void xfs_trans_init(struct xfs_mount *);
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void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
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void xfs_trans_del_item(struct xfs_log_item *);
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void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
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void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
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xfs_lsn_t commit_lsn, bool aborted);
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/*
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* AIL traversal cursor.
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*
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* Rather than using a generation number for detecting changes in the ail, use
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* a cursor that is protected by the ail lock. The aild cursor exists in the
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* struct xfs_ail, but other traversals can declare it on the stack and link it
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* to the ail list.
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*
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* When an object is deleted from or moved int the AIL, the cursor list is
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* searched to see if the object is a designated cursor item. If it is, it is
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* deleted from the cursor so that the next time the cursor is used traversal
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* will return to the start.
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*
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* This means a traversal colliding with a removal will cause a restart of the
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* list scan, rather than any insertion or deletion anywhere in the list. The
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* low bit of the item pointer is set if the cursor has been invalidated so
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* that we can tell the difference between invalidation and reaching the end
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* of the list to trigger traversal restarts.
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*/
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struct xfs_ail_cursor {
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struct list_head list;
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struct xfs_log_item *item;
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};
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/*
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* Private AIL structures.
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*
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* Eventually we need to drive the locking in here as well.
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*/
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struct xfs_ail {
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struct xfs_mount *ail_mount;
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struct task_struct *ail_task;
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struct list_head ail_head;
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xfs_lsn_t ail_target;
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xfs_lsn_t ail_target_prev;
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struct list_head ail_cursors;
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spinlock_t ail_lock;
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xfs_lsn_t ail_last_pushed_lsn;
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int ail_log_flush;
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struct list_head ail_buf_list;
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wait_queue_head_t ail_empty;
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};
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/*
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* From xfs_trans_ail.c
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*/
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void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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struct xfs_log_item **log_items, int nr_items,
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xfs_lsn_t lsn) __releases(ailp->ail_lock);
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/*
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* Return a pointer to the first item in the AIL. If the AIL is empty, then
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* return NULL.
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*/
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static inline struct xfs_log_item *
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xfs_ail_min(
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struct xfs_ail *ailp)
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{
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return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
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li_ail);
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}
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static inline void
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xfs_trans_ail_update(
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struct xfs_ail *ailp,
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struct xfs_log_item *lip,
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xfs_lsn_t lsn) __releases(ailp->ail_lock)
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{
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xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
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}
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bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
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void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
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int shutdown_type) __releases(ailp->ail_lock);
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static inline void
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xfs_trans_ail_remove(
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struct xfs_log_item *lip,
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int shutdown_type)
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{
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struct xfs_ail *ailp = lip->li_ailp;
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spin_lock(&ailp->ail_lock);
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/* xfs_trans_ail_delete() drops the AIL lock */
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if (test_bit(XFS_LI_IN_AIL, &lip->li_flags))
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xfs_trans_ail_delete(ailp, lip, shutdown_type);
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else
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spin_unlock(&ailp->ail_lock);
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}
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void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
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void xfs_ail_push_all(struct xfs_ail *);
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void xfs_ail_push_all_sync(struct xfs_ail *);
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struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
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xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
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struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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xfs_lsn_t lsn);
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struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur,
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xfs_lsn_t lsn);
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struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
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struct xfs_ail_cursor *cur);
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void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
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#if BITS_PER_LONG != 64
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static inline void
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xfs_trans_ail_copy_lsn(
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struct xfs_ail *ailp,
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xfs_lsn_t *dst,
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xfs_lsn_t *src)
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{
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ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
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spin_lock(&ailp->ail_lock);
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*dst = *src;
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spin_unlock(&ailp->ail_lock);
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}
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#else
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static inline void
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xfs_trans_ail_copy_lsn(
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struct xfs_ail *ailp,
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xfs_lsn_t *dst,
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xfs_lsn_t *src)
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{
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ASSERT(sizeof(xfs_lsn_t) == 8);
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*dst = *src;
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}
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#endif
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static inline void
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xfs_clear_li_failed(
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struct xfs_log_item *lip)
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{
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struct xfs_buf *bp = lip->li_buf;
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ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags));
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lockdep_assert_held(&lip->li_ailp->ail_lock);
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if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) {
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lip->li_buf = NULL;
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xfs_buf_rele(bp);
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}
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}
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static inline void
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xfs_set_li_failed(
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struct xfs_log_item *lip,
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struct xfs_buf *bp)
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{
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lockdep_assert_held(&lip->li_ailp->ail_lock);
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if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) {
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xfs_buf_hold(bp);
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lip->li_buf = bp;
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}
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}
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#endif /* __XFS_TRANS_PRIV_H__ */
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