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1c30462542
Provide a variant of xlog_assign_tail_lsn that has the AIL lock already held. By doing so we do an additional atomic_read + atomic_set under the lock, which comes down to two instructions. Switch xfs_trans_ail_update_bulk and xfs_trans_ail_delete_bulk to the new version to reduce the number of lock roundtrips, and prepare for a new addition that would require a third lock roundtrip in xfs_trans_ail_delete_bulk. This addition is also the reason for slightly rearranging the conditionals and relying on xfs_log_space_wake for checking that the filesystem has been shut down internally. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
143 lines
4.3 KiB
C
143 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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struct xfs_ail;
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struct xfs_log_vec;
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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_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
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int flags);
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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, int 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 *xa_mount;
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struct task_struct *xa_task;
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struct list_head xa_ail;
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xfs_lsn_t xa_target;
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struct list_head xa_cursors;
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spinlock_t xa_lock;
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xfs_lsn_t xa_last_pushed_lsn;
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int xa_log_flush;
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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->xa_lock);
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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->xa_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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void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
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struct xfs_log_item **log_items, int nr_items)
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__releases(ailp->xa_lock);
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static inline void
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xfs_trans_ail_delete(
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struct xfs_ail *ailp,
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xfs_log_item_t *lip) __releases(ailp->xa_lock)
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{
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xfs_trans_ail_delete_bulk(ailp, &lip, 1);
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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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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 *ailp,
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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->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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