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xfs: use AIL bulk update function to implement single updates

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We now have two copies of AIL insert operations that are mostly
duplicate functionality. The single log item updates can be
implemented via the bulk updates by turning xfs_trans_ail_update()
into a simple wrapper. This removes all the duplicate insert
functionality and associated helpers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-12-20 12:34:26 +11:00 committed by Dave Chinner
parent 3013683253
commit e605994929
3 changed files with 13 additions and 96 deletions
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2
fs/xfs/xfs_log_recover.c
View File

@ -2573,7 +2573,7 @@ xlog_recover_efi_pass2(
/*
* xfs_trans_ail_update() drops the AIL lock.
*/
xfs_trans_ail_update(log->l_ailp, (xfs_log_item_t *)efip, lsn);
xfs_trans_ail_update(log->l_ailp, &efip->efi_item, lsn);
return 0;
}

88
fs/xfs/xfs_trans_ail.c
View File

@ -28,7 +28,6 @@
#include "xfs_trans_priv.h"
#include "xfs_error.h"
STATIC void xfs_ail_insert(struct xfs_ail *, xfs_log_item_t *);
STATIC void xfs_ail_splice(struct xfs_ail *, struct list_head *, xfs_lsn_t);
STATIC void xfs_ail_delete(struct xfs_ail *, xfs_log_item_t *);
STATIC xfs_log_item_t * xfs_ail_min(struct xfs_ail *);
@ -450,58 +449,6 @@ xfs_trans_unlocked_item(
xfs_log_move_tail(ailp->xa_mount, 1);
} /* xfs_trans_unlocked_item */
/*
* Update the position of the item in the AIL with the new
* lsn. If it is not yet in the AIL, add it. Otherwise, move
* it to its new position by removing it and re-adding it.
*
* Wakeup anyone with an lsn less than the item's lsn. If the item
* we move in the AIL is the minimum one, update the tail lsn in the
* log manager.
*
* This function must be called with the AIL lock held. The lock
* is dropped before returning.
*/
void
xfs_trans_ail_update(
struct xfs_ail *ailp,
xfs_log_item_t *lip,
xfs_lsn_t lsn) __releases(ailp->xa_lock)
{
xfs_log_item_t *mlip; /* ptr to minimum lip */
xfs_lsn_t tail_lsn;
mlip = xfs_ail_min(ailp);
if (lip->li_flags & XFS_LI_IN_AIL) {
xfs_ail_delete(ailp, lip);
} else {
lip->li_flags |= XFS_LI_IN_AIL;
}
lip->li_lsn = lsn;
xfs_ail_insert(ailp, lip);
if (mlip == lip) {
mlip = xfs_ail_min(ailp);
/*
* It is not safe to access mlip after the AIL lock is
* dropped, so we must get a copy of li_lsn before we do
* so. This is especially important on 32-bit platforms
* where accessing and updating 64-bit values like li_lsn
* is not atomic.
*/
tail_lsn = mlip->li_lsn;
spin_unlock(&ailp->xa_lock);
xfs_log_move_tail(ailp->xa_mount, tail_lsn);
} else {
spin_unlock(&ailp->xa_lock);
}
} /* xfs_trans_update_ail */
/*
* xfs_trans_ail_update - bulk AIL insertion operation.
*
@ -763,41 +710,6 @@ xfs_trans_ail_destroy(
kmem_free(ailp);
}
/*
* Insert the given log item into the AIL.
* We almost always insert at the end of the list, so on inserts
* we search from the end of the list to find where the
* new item belongs.
*/
STATIC void
xfs_ail_insert(
struct xfs_ail *ailp,
xfs_log_item_t *lip)
{
xfs_log_item_t *next_lip;
/*
* If the list is empty, just insert the item.
*/
if (list_empty(&ailp->xa_ail)) {
list_add(&lip->li_ail, &ailp->xa_ail);
return;
}
list_for_each_entry_reverse(next_lip, &ailp->xa_ail, li_ail) {
if (XFS_LSN_CMP(next_lip->li_lsn, lip->li_lsn) <= 0)
break;
}
ASSERT(&next_lip->li_ail == &ailp->xa_ail ||
XFS_LSN_CMP(next_lip->li_lsn, lip->li_lsn) <= 0);
list_add(&lip->li_ail, &next_lip->li_ail);
xfs_ail_check(ailp, lip);
return;
}
/*
* splice the log item list into the AIL at the given LSN.
*/

19
fs/xfs/xfs_trans_priv.h
View File

@ -75,13 +75,18 @@ struct xfs_ail {
/*
* 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_update_bulk(struct xfs_ail *ailp,
struct xfs_log_item **log_items,
int nr_items, xfs_lsn_t lsn)
__releases(ailp->xa_lock);
void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
struct xfs_log_item **log_items, int nr_items,
xfs_lsn_t lsn) __releases(ailp->xa_lock);
static inline void
xfs_trans_ail_update(
struct xfs_ail *ailp,
struct xfs_log_item *lip,
xfs_lsn_t lsn) __releases(ailp->xa_lock)
{
xfs_trans_ail_update_bulk(ailp, &lip, 1, lsn);
}
void xfs_trans_ail_delete(struct xfs_ail *ailp,
struct xfs_log_item *lip)
__releases(ailp->xa_lock);