[PATCH v2 34/54] fs: use igrab in drop_pagecache_sb

[Josef Bacik <josef@toxicpanda.com>]

Just use igrab to see if the inode is valid instead of checking
I_FREEING|I_WILL_FREE.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/drop_caches.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 019a8b4eaaf9..852ccf8e84cb 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -23,18 +23,15 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
 	spin_lock(&sb->s_inode_list_lock);
 	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
 		spin_lock(&inode->i_lock);
-		/*
-		 * We must skip inodes in unusual state. We may also skip
-		 * inodes without pages but we deliberately won't in case
-		 * we need to reschedule to avoid softlockups.
-		 */
-		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
+		if ((inode->i_state & I_NEW) ||
 		    (mapping_empty(inode->i_mapping) && !need_resched())) {
 			spin_unlock(&inode->i_lock);
 			continue;
 		}
-		__iget(inode);
 		spin_unlock(&inode->i_lock);
+
+		if (!igrab(inode))
+			continue;
 		spin_unlock(&sb->s_inode_list_lock);
 
 		invalidate_mapping_pages(inode->i_mapping, 0, -1);
-- 
2.49.0