783a2f656f
Change all the remaining AIL API functions that are passed struct xfs_mount pointers to pass pointers directly to the struct xfs_ail being used. With this conversion, all external access to the AIL is via the struct xfs_ail. Hence the operation and referencing of the AIL is almost entirely independent of the xfs_mount that is using it - it is now much more tightly tied to the log and the items it is tracking in the log than it is tied to the xfs_mount. SGI-PV: 988143 SGI-Modid: xfs-linux-melb:xfs-kern:32353a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
|
|
* 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);
|
|
void xfs_trans_free_busy(xfs_trans_t *tp);
|
|
xfs_log_busy_slot_t *xfs_trans_add_busy(xfs_trans_t *tp,
|
|
xfs_agnumber_t ag,
|
|
xfs_extlen_t idx);
|
|
|
|
/*
|
|
* 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__ */
|