f2fs: atomically set inode->i_flags in f2fs_set_inode_flags()

Use set_mask_bits() to atomically set i_flags instead of clearing out the
S_IMMUTABLE, S_APPEND, etc. flags and then setting them from the
FS_IMMUTABLE_FL, FS_APPEND_FL, etc. flags, since this opens up a race
where an immutable file has the immutable flag cleared for a brief
window of time.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index ee829d360468597f3619b5ef1b3719b1fd942516..f7a655373c4615528c70422fabdd14a13cb33963 100644 (file)
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -12,6 +12,7 @@
 #include <linux/f2fs_fs.h>
 #include <linux/buffer_head.h>
 #include <linux/writeback.h>
+#include <linux/bitops.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -21,20 +22,20 @@
 void f2fs_set_inode_flags(struct inode *inode)
 {
        unsigned int flags = F2FS_I(inode)->i_flags;
-
-       inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |
-                       S_NOATIME | S_DIRSYNC);
+       unsigned int new_fl = 0;
 
        if (flags & FS_SYNC_FL)
-               inode->i_flags |= S_SYNC;
+               new_fl |= S_SYNC;
        if (flags & FS_APPEND_FL)
-               inode->i_flags |= S_APPEND;
+               new_fl |= S_APPEND;
        if (flags & FS_IMMUTABLE_FL)
-               inode->i_flags |= S_IMMUTABLE;
+               new_fl |= S_IMMUTABLE;
        if (flags & FS_NOATIME_FL)
-               inode->i_flags |= S_NOATIME;
+               new_fl |= S_NOATIME;
        if (flags & FS_DIRSYNC_FL)
-               inode->i_flags |= S_DIRSYNC;
+               new_fl |= S_DIRSYNC;
+       set_mask_bits(&inode->i_flags,
+                       S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC, new_fl);
 }
 
 static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)