linux-kernel - [PATCH 2/3] f2fs: relocate inode_{,un}lock in F2FS_IOC

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Message-Id: <20170503155914.6859-2-chao@kernel.org>
Date:   Wed,  3 May 2017 23:59:13 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 2/3] f2fs: relocate inode_{,un}lock in F2FS_IOC_SETFLAGS

From: Chao Yu <yuchao0@...wei.com>

This patch expands cover region of inode->i_rwsem to keep setting flag
atomically.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/file.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 1c1c9bc4f19a..e20a1c01e556 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1494,10 +1494,10 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
 	if (ret)
 		return ret;
 
-	flags = f2fs_mask_flags(inode->i_mode, flags);
-
 	inode_lock(inode);
 
+	flags = f2fs_mask_flags(inode->i_mode, flags);
+
 	oldflags = fi->i_flags;
 
 	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
@@ -1511,10 +1511,11 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
 	flags = flags & FS_FL_USER_MODIFIABLE;
 	flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
 	fi->i_flags = flags;
-	inode_unlock(inode);
 
 	inode->i_ctime = current_time(inode);
 	f2fs_set_inode_flags(inode);
+
+	inode_unlock(inode);
 out:
 	mnt_drop_write_file(filp);
 	return ret;
-- 
2.12.2.575.gb14f27f