diff options
| author | Gao Xiang <gaoxiang25@huawei.com> | 2019-01-16 21:10:10 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-18 10:37:16 +0100 |
| commit | 4501ca36bc18ee73a3e88373ff50c22233b82324 (patch) | |
| tree | 7dadbd3c566a27f61a1c0a3274d066a339652ec5 | |
| parent | d60eff4396f1f7423945f01acc274043c1370bc7 (diff) | |
staging: erofs: move shrink accounting inside the function
This patch moves the &erofs_global_shrink_cnt accounting
from the caller to erofs_workgroup_get(). It's cleaner and
it matches erofs_workgroup_put() better. No behavior change.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/erofs/utils.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/drivers/staging/erofs/utils.c b/drivers/staging/erofs/utils.c index d24945aab133..5695efaeb43a 100644 --- a/drivers/staging/erofs/utils.c +++ b/drivers/staging/erofs/utils.c @@ -34,29 +34,29 @@ static atomic_long_t erofs_global_shrink_cnt; #define __erofs_workgroup_get(grp) atomic_inc(&(grp)->refcount) #define __erofs_workgroup_put(grp) atomic_dec(&(grp)->refcount) -static int erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt) +static int erofs_workgroup_get(struct erofs_workgroup *grp) { int o; repeat: o = erofs_wait_on_workgroup_freezed(grp); - if (unlikely(o <= 0)) return -1; if (unlikely(atomic_cmpxchg(&grp->refcount, o, o + 1) != o)) goto repeat; - *ocnt = o; + /* decrease refcount paired by erofs_workgroup_put */ + if (unlikely(o == 1)) + atomic_long_dec(&erofs_global_shrink_cnt); return 0; } -struct erofs_workgroup *erofs_find_workgroup( - struct super_block *sb, pgoff_t index, bool *tag) +struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, + pgoff_t index, bool *tag) { struct erofs_sb_info *sbi = EROFS_SB(sb); struct erofs_workgroup *grp; - int oldcount; repeat: rcu_read_lock(); @@ -65,15 +65,12 @@ repeat: *tag = xa_pointer_tag(grp); grp = xa_untag_pointer(grp); - if (erofs_workgroup_get(grp, &oldcount)) { + if (erofs_workgroup_get(grp)) { /* prefer to relax rcu read side */ rcu_read_unlock(); goto repeat; } - /* decrease refcount added by erofs_workgroup_put */ - if (unlikely(oldcount == 1)) - atomic_long_dec(&erofs_global_shrink_cnt); DBG_BUGON(index != grp->index); } rcu_read_unlock(); |