From: Junghoon Kim <jhoon20.kim@samsung.com>
Date: Tue, 17 Oct 2017 05:43:04 +0000 (+0900)
Subject: misc: tizen-inform-reboot: resolve sync failure about reboot parameter
X-Git-Tag: accepted/tizen/unified/20230814.120944~301
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b0008436c158ee4b4bbb85fe3cf14ca71783b6ff;p=platform%2Fkernel%2Flinux-rpi.git

misc: tizen-inform-reboot: resolve sync failure about reboot parameter

Currently, writing reboot paramter into INFORM partition fails
infrequently.

Resolve this issue by calling sync_filesystem function so that it writes
out and waits upon all dirty data associated with this superblock.

Change-Id: Ic62df0c3c4e565ca7211eb85661ead6979f0ad8d
Signed-off-by: Junghoon Kim <jhoon20.kim@samsung.com>
---

diff --git a/drivers/misc/tizen-inform-reboot.c b/drivers/misc/tizen-inform-reboot.c
index 2e26186..08a0552 100644
--- a/drivers/misc/tizen-inform-reboot.c
+++ b/drivers/misc/tizen-inform-reboot.c
@@ -33,6 +33,8 @@ static int inform_reboot_notifier(struct notifier_block *nb,
 	if (fd >= 0) {
 		file = fget(fd);
 		if (file) {
+			struct super_block *sb = file->f_path.dentry->d_sb;
+
 			if (cmd) {
 				if (!strncmp(cmd, "fota", 4))
 					cmd = "upgr";
@@ -44,12 +46,14 @@ static int inform_reboot_notifier(struct notifier_block *nb,
 				cmd = "norm";
 
 			vfs_write(file, cmd, strlen(cmd), &pos);
-			vfs_fsync(file, 0);
+
+			down_read(&sb->s_umount);
+			sync_filesystem(sb);
+			up_read(&sb->s_umount);
+
 			fput(file);
 		}
 		sys_close(fd);
-		/* to guarantee all file data and metadata sync */
-		emergency_sync();
 	} else {
 		pr_err("Reboot parameter passing is failed.\n"
 				"Inform file path should be described correctly in config.\n");