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/*
* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_TRANS_PRIV_H__
#define __XFS_TRANS_PRIV_H__
struct xfs_log_item;
struct xfs_log_item_desc;
struct xfs_mount;
struct xfs_trans;
/*
* From xfs_trans_item.c
*/
struct xfs_log_item_desc *xfs_trans_add_item(struct xfs_trans *,
struct xfs_log_item *);
void xfs_trans_free_item(struct xfs_trans *,
struct xfs_log_item_desc *);
struct xfs_log_item_desc *xfs_trans_find_item(struct xfs_trans *,
struct xfs_log_item *);
struct xfs_log_item_desc *xfs_trans_first_item(struct xfs_trans *);
struct xfs_log_item_desc *xfs_trans_next_item(struct xfs_trans *,
struct xfs_log_item_desc *);
void xfs_trans_free_items(struct xfs_trans *, int);
void xfs_trans_unlock_items(struct xfs_trans *,
xfs_lsn_t);
/*
* AIL traversal cursor.
*
* Rather than using a generation number for detecting changes in the ail, use
* a cursor that is protected by the ail lock. The aild cursor exists in the
* struct xfs_ail, but other traversals can declare it on the stack and link it
* to the ail list.
*
* When an object is deleted from or moved int the AIL, the cursor list is
* searched to see if the object is a designated cursor item. If it is, it is
* deleted from the cursor so that the next time the cursor is used traversal
* will return to the start.
*
* This means a traversal colliding with a removal will cause a restart of the
* list scan, rather than any insertion or deletion anywhere in the list. The
* low bit of the item pointer is set if the cursor has been invalidated so
* that we can tell the difference between invalidation and reaching the end
* of the list to trigger traversal restarts.
*/
struct xfs_ail_cursor {
struct xfs_ail_cursor *next;
struct xfs_log_item *item;
};
/*
* Private AIL structures.
*
* Eventually we need to drive the locking in here as well.
*/
struct xfs_ail {
struct xfs_mount *xa_mount;
struct list_head xa_ail;
uint xa_gen;
struct task_struct *xa_task;
xfs_lsn_t xa_target;
struct xfs_ail_cursor xa_cursors;
spinlock_t xa_lock;
};
/*
* From xfs_trans_ail.c
*/
void xfs_trans_ail_update(struct xfs_ail *ailp,
struct xfs_log_item *lip, xfs_lsn_t lsn)
__releases(ailp->xa_lock);
void xfs_trans_ail_delete(struct xfs_ail *ailp,
struct xfs_log_item *lip)
__releases(ailp->xa_lock);
void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t);
void xfs_trans_unlocked_item(struct xfs_ail *,
xfs_log_item_t *);
xfs_lsn_t xfs_trans_ail_tail(struct xfs_ail *ailp);
struct xfs_log_item *xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur,
xfs_lsn_t lsn);
struct xfs_log_item *xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur);
void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur);
long xfsaild_push(struct xfs_ail *, xfs_lsn_t *);
void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t);
int xfsaild_start(struct xfs_ail *);
void xfsaild_stop(struct xfs_ail *);
#if BITS_PER_LONG != 64
static inline void
xfs_trans_ail_copy_lsn(
struct xfs_ail *ailp,
xfs_lsn_t *dst,
xfs_lsn_t *src)
{
ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
spin_lock(&ailp->xa_lock);
*dst = *src;
spin_unlock(&ailp->xa_lock);
}
#else
static inline void
xfs_trans_ail_copy_lsn(
struct xfs_ail *ailp,
xfs_lsn_t *dst,
xfs_lsn_t *src)
{
ASSERT(sizeof(xfs_lsn_t) == 8);
*dst = *src;
}
#endif
#endif /* __XFS_TRANS_PRIV_H__ */
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