From 55acc6618259c8ff0a400a131f0f4b613e96010a Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 4 Jul 2017 22:03:18 +0200 Subject: ovl: add flag for upper in ovl_entry For rename, we need to ensure that an upper alias exists for hard links before attempting the operation. Introduce a flag in ovl_entry to track the state of the upper alias. Signed-off-by: Miklos Szeredi --- fs/overlayfs/util.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'fs/overlayfs/util.c') diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index c80b4bf1e64f..38fa75228c66 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -201,6 +201,25 @@ void ovl_dentry_set_opaque(struct dentry *dentry) oe->opaque = true; } +/* + * For hard links it's possible for ovl_dentry_upper() to return positive, while + * there's no actual upper alias for the inode. Copy up code needs to know + * about the existence of the upper alias, so it can't use ovl_dentry_upper(). + */ +bool ovl_dentry_has_upper_alias(struct dentry *dentry) +{ + struct ovl_entry *oe = dentry->d_fsdata; + + return oe->has_upper; +} + +void ovl_dentry_set_upper_alias(struct dentry *dentry) +{ + struct ovl_entry *oe = dentry->d_fsdata; + + oe->has_upper = true; +} + bool ovl_redirect_dir(struct super_block *sb) { struct ovl_fs *ofs = sb->s_fs_info; -- cgit