From: Chao Yu <yuchao0@huawei.com>
Date: Tue, 8 Aug 2017 11:09:08 +0000 (+0800)
Subject: f2fs: retry to revoke atomic commit in -ENOMEM case
X-Git-Tag: v4.14-rc1~46^2~30
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7f2b4e8ea5b49846f7d20f1694dbca81f88b8d50;p=thirdparty%2Flinux.git

f2fs: retry to revoke atomic commit in -ENOMEM case

During atomic committing, if we encounter -ENOMEM in revoke path, it's
better to give a chance to retry revoking.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 95267630c8c46..05144b3a7f622 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -213,9 +213,15 @@ static int __revoke_inmem_pages(struct inode *inode,
 			struct node_info ni;
 
 			trace_f2fs_commit_inmem_page(page, INMEM_REVOKE);
-
+retry:
 			set_new_dnode(&dn, inode, NULL, NULL, 0);
-			if (get_dnode_of_data(&dn, page->index, LOOKUP_NODE)) {
+			err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
+			if (err) {
+				if (err == -ENOMEM) {
+					congestion_wait(BLK_RW_ASYNC, HZ/50);
+					cond_resched();
+					goto retry;
+				}
 				err = -EAGAIN;
 				goto next;
 			}