From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 4 May 2018 06:26:02 +0000 (-0700)
Subject: UPSTREAM: f2fs: avoid fsync() failure caused by EAGAIN in writepage()
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=086f384e23b5b282e4914ac2ce9522294471abd2;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

UPSTREAM: f2fs: avoid fsync() failure caused by EAGAIN in writepage()

pageout() in MM traslates EAGAIN, so calls handle_write_error()
 -> mapping_set_error() -> set_bit(AS_EIO, ...).
 file_write_and_wait_range() will see EIO error, which is critical
 to return value of fsync() followed by atomic_write failure to user.

Change-Id: I6124ed299baf5e5b8993bb6b54f07bb8771eda8c
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 520a9486182437847212c8e226d042b1e14b7cc2)
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a670702cf3ff..3d846b027fa1 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1902,7 +1902,13 @@ out:
 
 redirty_out:
 	redirty_page_for_writepage(wbc, page);
-	if (!err)
+	/*
+	 * pageout() in MM traslates EAGAIN, so calls handle_write_error()
+	 * -> mapping_set_error() -> set_bit(AS_EIO, ...).
+	 * file_write_and_wait_range() will see EIO error, which is critical
+	 * to return value of fsync() followed by atomic_write failure to user.
+	 */
+	if (!err || wbc->for_reclaim)
 		return AOP_WRITEPAGE_ACTIVATE;
 	unlock_page(page);
 	return err;