f2fs: introduce help macro on_build_free_nids()

Introduce help macro on_build_free_nids() which just uses build_lock
to judge whether the building free nid is going, so that we can remove
the on_build_free_nids field from f2fs_sb_info.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
[Jaegeuk Kim: remove an unnecessary white line removal]
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

2 files changed, 3 insertions, 4 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 91f4c5e7b6a2..c56e67b468da 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -417,7 +417,6 @@ struct f2fs_sb_info {
         struct mutex node_write;                /* locking node writes */
         struct mutex writepages;                /* mutex for writepages() */
         bool por_doing;                         /* recovery is doing or not */
-        bool on_build_free_nids;                /* build_free_nids is doing */
         wait_queue_head_t cp_wait;
 
         /* for orphan inode management */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index a070b1457d70..431bcb42cdd0 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -21,6 +21,8 @@
 #include "segment.h"
 #include <trace/events/f2fs.h>
 
+#define on_build_free_nids(nmi) mutex_is_locked(&nm_i->build_lock)
+
 static struct kmem_cache *nat_entry_slab;
 static struct kmem_cache *free_nid_slab;
 
@@ -1422,7 +1424,7 @@ retry:
         spin_lock(&nm_i->free_nid_list_lock);
 
         /* We should not use stale free nids created by build_free_nids */
-        if (nm_i->fcnt && !sbi->on_build_free_nids) {
+        if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
                 f2fs_bug_on(list_empty(&nm_i->free_nid_list));
                 list_for_each(this, &nm_i->free_nid_list) {
                         i = list_entry(this, struct free_nid, list);
@@ -1441,9 +1443,7 @@ retry:
 
         /* Let's scan nat pages and its caches to get free nids */
         mutex_lock(&nm_i->build_lock);
-        sbi->on_build_free_nids = true;
         build_free_nids(sbi);
-        sbi->on_build_free_nids = false;
         mutex_unlock(&nm_i->build_lock);
         goto retry;
 }