summaryrefslogtreecommitdiffstats
path: root/fs/overlayfs/util.c
diff options
context:
space:
mode:
authorMiklos Szeredi <mszeredi@redhat.com>2017-07-04 22:03:18 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2017-07-04 22:03:18 +0200
commit55acc6618259c8ff0a400a131f0f4b613e96010a (patch)
tree82f73eccca8d417ec8c77ad1b02dd28748c5c456 /fs/overlayfs/util.c
parent23f0ab13eaa69b4a351184cbec448be2aad3a3a9 (diff)
downloadlinux-55acc6618259c8ff0a400a131f0f4b613e96010a.tar.bz2
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 <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/util.c')
-rw-r--r--fs/overlayfs/util.c19
1 files changed, 19 insertions, 0 deletions
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;