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authorJie Liu <jeff.liu@oracle.com>2013-08-15 13:08:35 +0800
committerBen Myers <bpm@sgi.com>2013-08-23 12:57:43 -0500
commit8d1d40832b1c53ae73931f1b536ce1ab7375b3c8 (patch)
treebeeae7e87ad17163cb7577827cde3bf9c93fd1ca /fs/xfs/xfs_trans_priv.h
parent46677e679fba8c2db7c94a7142ad9abb72192ebc (diff)
xfs: Simplify xfs_ail_min() with list_first_entry_or_null()
At xfs_ail_min(), we do check if the AIL list is empty or not before returning the first item in it with list_empty() and list_first_entry(). This can be simplified a bit with a new list operation routine that is the list_first_entry_or_null() which has been introduced by: commit 6d7581e62f8be462440d7b22c6361f7c9fa4902b list: introduce list_first_entry_or_null v2: make xfs_ail_min() as a static inline function and move it to xfs_trans_priv.h as per Dave Chinner's comments. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Reviewed-by: Ben Myers <bpm@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_trans_priv.h')
-rw-r--r--fs/xfs/xfs_trans_priv.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index d43b13004f7c..c52def0b441c 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -86,6 +86,18 @@ void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
struct xfs_ail_cursor *cur,
struct xfs_log_item **log_items, int nr_items,
xfs_lsn_t lsn) __releases(ailp->xa_lock);
+/*
+ * Return a pointer to the first item in the AIL. If the AIL is empty, then
+ * return NULL.
+ */
+static inline struct xfs_log_item *
+xfs_ail_min(
+ struct xfs_ail *ailp)
+{
+ return list_first_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
+ li_ail);
+}
+
static inline void
xfs_trans_ail_update(
struct xfs_ail *ailp,