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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 6d7581e62f
    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>
This commit is contained in:
Jie Liu 2013-08-15 13:08:35 +08:00 committed by Ben Myers
parent 46677e679f
commit 8d1d40832b
2 changed files with 12 additions and 14 deletions
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14
fs/xfs/xfs_trans_ail.c
View File

@ -61,20 +61,6 @@ xfs_ail_check(
#endif /* DEBUG */
/*
* Return a pointer to the first item in the AIL. If the AIL is empty, then
* return NULL.
*/
xfs_log_item_t *
xfs_ail_min(
struct xfs_ail *ailp)
{
if (list_empty(&ailp->xa_ail))
return NULL;
return list_first_entry(&ailp->xa_ail, xfs_log_item_t, li_ail);
}
/*
* Return a pointer to the last item in the AIL. If the AIL is empty, then
* return NULL.
*/

12
fs/xfs/xfs_trans_priv.h
View File

@ -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,