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| author |   Jie Liu <jeff.liu@oracle.com> | 2013-08-15 13:08:35 +0800 |
|---|---|---|
| committer |   Ben Myers <bpm@sgi.com> | 2013-08-23 12:57:43 -0500 |
| commit | 8d1d40832b1c53ae73931f1b536ce1ab7375b3c8 (patch) | |
| tree | beeae7e87ad17163cb7577827cde3bf9c93fd1ca /fs/xfs/xfs_trans_priv.h | |
| parent | xfs: Register hotcpu notifier after initialization (diff) | |
| download | linux-dev-8d1d40832b1c53ae73931f1b536ce1ab7375b3c8.tar.xz linux-dev-8d1d40832b1c53ae73931f1b536ce1ab7375b3c8.zip | |
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.h | 12 |
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, |