From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 4 May 2018 06:26:02 +0000 (-0700)
Subject: f2fs: avoid fsync() failure caused by EAGAIN in writepage()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4bbf1ce3a1e3efb6c746e0dbf5a5acb889b3b38b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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

[ Upstream commit 5b19d284f5195a925dd015a6397bfce184097378 ]

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.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 36b535207c88..85142e5df88b 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1601,7 +1601,13 @@ 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;