[PATCH] f2fs: give a try to do atomic write in -ENOMEM case

[Jaegeuk Kim]

It'd be better to retry writing atomic pages when we get -ENOMEM.

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/segment.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f964b68718c1..f5d139f897dc 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -309,17 +309,21 @@ static int __commit_inmem_pages(struct inode *inode,
                                inode_dec_dirty_pages(inode);
                                remove_dirty_inode(inode);
                        }
-
+retry:
                        fio.page = page;
                        fio.old_blkaddr = NULL_ADDR;
                        fio.encrypted_page = NULL;
                        fio.need_lock = LOCK_DONE;
                        err = do_write_data_page(&fio);
                        if (err) {
+                               if (err == -ENOMEM) {
+                                       congestion_wait(BLK_RW_ASYNC, HZ/50);
+                                       cond_resched();
+                                       goto retry;
+                               }
                                unlock_page(page);
                                break;
                        }
-
                        /* record old blkaddr for revoking */
                        cur->old_addr = fio.old_blkaddr;
                        last_idx = page->index;
-- 
2.13.0.rc1.294.g07d810a77f-goog