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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
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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_log_item_desc;
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struct xfs_mount;
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struct xfs_trans;
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/*
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* From xfs_trans_item.c
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*/
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struct xfs_log_item_desc *xfs_trans_add_item(struct xfs_trans *,
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struct xfs_log_item *);
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void xfs_trans_free_item(struct xfs_trans *,
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struct xfs_log_item_desc *);
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struct xfs_log_item_desc *xfs_trans_find_item(struct xfs_trans *,
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struct xfs_log_item *);
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struct xfs_log_item_desc *xfs_trans_first_item(struct xfs_trans *);
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struct xfs_log_item_desc *xfs_trans_next_item(struct xfs_trans *,
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struct xfs_log_item_desc *);
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void xfs_trans_free_items(struct xfs_trans *, int);
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void xfs_trans_unlock_items(struct xfs_trans *,
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xfs_lsn_t);
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void xfs_trans_free_busy(xfs_trans_t *tp);
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xfs_log_busy_slot_t *xfs_trans_add_busy(xfs_trans_t *tp,
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xfs_agnumber_t ag,
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xfs_extlen_t idx);
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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 xfs_ail_cursor *next;
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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 *xa_mount;
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struct list_head xa_ail;
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uint xa_gen;
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struct task_struct *xa_task;
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xfs_lsn_t xa_target;
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struct xfs_ail_cursor xa_cursors;
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spinlock_t xa_lock;
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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(struct xfs_ail *ailp,
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struct xfs_log_item *lip, xfs_lsn_t lsn)
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__releases(ailp->xa_lock);
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void xfs_trans_ail_delete(struct xfs_ail *ailp,
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struct xfs_log_item *lip)
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__releases(ailp->xa_lock);
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void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t);
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void xfs_trans_unlocked_item(struct xfs_ail *,
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xfs_log_item_t *);
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xfs_lsn_t xfs_trans_ail_tail(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_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 *ailp,
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struct xfs_ail_cursor *cur);
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long xfsaild_push(struct xfs_ail *, xfs_lsn_t *);
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void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t);
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int xfsaild_start(struct xfs_ail *);
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void xfsaild_stop(struct xfs_ail *);
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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->xa_lock);
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*dst = *src;
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spin_unlock(&ailp->xa_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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#endif /* __XFS_TRANS_PRIV_H__ */
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