From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p6I3edG9078016 for ; Sun, 17 Jul 2011 22:40:39 -0500 Received: from ipmail06.adl6.internode.on.net (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 94A091D88095 for ; Sun, 17 Jul 2011 20:40:37 -0700 (PDT) Received: from ipmail06.adl6.internode.on.net (ipmail06.adl6.internode.on.net [150.101.137.145]) by cuda.sgi.com with ESMTP id XkP5hDbymAMCJNYD for ; Sun, 17 Jul 2011 20:40:37 -0700 (PDT) Received: from chute ([192.168.1.1] helo=disappointment) by dastard with esmtp (Exim 4.72) (envelope-from ) id 1Qieh7-0008Bd-72 for xfs@oss.sgi.com; Mon, 18 Jul 2011 13:40:33 +1000 Received: from dave by disappointment with local (Exim 4.76) (envelope-from ) id 1Qiegw-0002a9-SR for xfs@oss.sgi.com; Mon, 18 Jul 2011 13:40:22 +1000 From: Dave Chinner Subject: [PATCH 2/4] xfs: remove confusing ail cursor wrapper Date: Mon, 18 Jul 2011 13:40:17 +1000 Message-Id: <1310960419-9875-3-git-send-email-david@fromorbit.com> In-Reply-To: <1310960419-9875-1-git-send-email-david@fromorbit.com> References: <1310960419-9875-1-git-send-email-david@fromorbit.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com From: Dave Chinner xfs_trans_ail_cursor_set() doesn't set the cursor to the current log item, it sets it to the next item. There is already a function for doing this - xfs_trans_ail_cursor_next() - and the _set function is simply a two line wrapper. Remove it and open code the setting of the cursor in the two locations that call it to remove the confusion. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_trans_ail.c | 50 ++++++++++++++++++----------------------------- 1 files changed, 19 insertions(+), 31 deletions(-) diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c index 9a69dc0..7908c79 100644 --- a/fs/xfs/xfs_trans_ail.c +++ b/fs/xfs/xfs_trans_ail.c @@ -189,20 +189,6 @@ xfs_trans_ail_cursor_init( } /* - * Set the cursor to the next item, because when we look - * up the cursor the current item may have been freed. - */ -STATIC void -xfs_trans_ail_cursor_set( - struct xfs_ail *ailp, - struct xfs_ail_cursor *cur, - struct xfs_log_item *lip) -{ - if (lip) - cur->item = xfs_ail_next(ailp, lip); -} - -/* * Get the next item in the traversal and advance the cursor. * If the cursor was invalidated (inidicated by a lip of 1), * restart the traversal. @@ -216,7 +202,8 @@ xfs_trans_ail_cursor_next( if ((__psint_t)lip & 1) lip = xfs_ail_min(ailp); - xfs_trans_ail_cursor_set(ailp, cur, lip); + if (lip) + cur->item = xfs_ail_next(ailp, lip); return lip; } @@ -272,9 +259,10 @@ xfs_trans_ail_cursor_clear( } /* - * Initialise the cursor to the first item in the AIL with the given @lsn. - * This searches the list from lowest LSN to highest. Pass a @lsn of zero - * to initialise the cursor to the first item in the AIL. + * Find the first item in the AIL with the given @lsn by searching in ascending + * LSN order and initialise the cursor to point to the next item for a + * ascending traversal. Pass a @lsn of zero to initialise the cursor to the + * first item in the AIL. Returns NULL if the list is empty. */ xfs_log_item_t * xfs_trans_ail_cursor_first( @@ -285,26 +273,24 @@ xfs_trans_ail_cursor_first( xfs_log_item_t *lip; xfs_trans_ail_cursor_init(ailp, cur); - lip = xfs_ail_min(ailp); - if (lsn == 0) + + if (lsn == 0) { + lip = xfs_ail_min(ailp); goto out; + } list_for_each_entry(lip, &ailp->xa_ail, li_ail) { if (XFS_LSN_CMP(lip->li_lsn, lsn) >= 0) goto out; } - lip = NULL; + return NULL; + out: - xfs_trans_ail_cursor_set(ailp, cur, lip); + if (lip) + cur->item = xfs_ail_next(ailp, lip); return lip; } -/* - * Initialise the cursor to the last item in the AIL with the given @lsn. - * This searches the list from highest LSN to lowest. If there is no item with - * the value of @lsn, then it sets the cursor to the last item with an LSN lower - * than @lsn. - */ static struct xfs_log_item * __xfs_trans_ail_cursor_last( struct xfs_ail *ailp, @@ -320,8 +306,10 @@ __xfs_trans_ail_cursor_last( } /* - * Initialise the cursor to the last item in the AIL with the given @lsn. - * This searches the list from highest LSN to lowest. + * Find the last item in the AIL with the given @lsn by searching in descending + * LSN order and initialise the cursor to point to that item. If there is no + * item with the value of @lsn, then it sets the cursor to the last item with an + * LSN lower than @lsn. Returns NULL if the list is empty. */ struct xfs_log_item * xfs_trans_ail_cursor_last( @@ -335,7 +323,7 @@ xfs_trans_ail_cursor_last( } /* - * splice the log item list into the AIL at the given LSN. We splice to the + * Splice the log item list into the AIL at the given LSN. We splice to the * tail of the given LSN to maintain insert order for push traversals. The * cursor is optional, allowing repeated updates to the same LSN to avoid * repeated traversals. -- 1.7.5.1 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs