ovl: rename: simplify handling of lower/merged directory
d_is_dir() is safe to call on a negative dentry. Use this fact to simplify
handling of the lower or merged directories.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 76b1edc..69c3971 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -761,13 +761,18 @@ static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
return ovl_do_remove(dentry, true);
}
+static bool ovl_type_merge_or_lower(struct dentry *dentry)
+{
+ enum ovl_path_type type = ovl_path_type(dentry);
+
+ return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
+}
+
static int ovl_rename(struct inode *olddir, struct dentry *old,
struct inode *newdir, struct dentry *new,
unsigned int flags)
{
int err;
- enum ovl_path_type old_type;
- enum ovl_path_type new_type;
struct dentry *old_upperdir;
struct dentry *new_upperdir;
struct dentry *olddentry;
@@ -778,7 +783,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
bool cleanup_whiteout = false;
bool overwrite = !(flags & RENAME_EXCHANGE);
bool is_dir = d_is_dir(old);
- bool new_is_dir = false;
+ bool new_is_dir = d_is_dir(new);
struct dentry *opaquedir = NULL;
const struct cred *old_cred = NULL;
@@ -789,22 +794,11 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
flags &= ~RENAME_NOREPLACE;
/* Don't copy up directory trees */
- old_type = ovl_path_type(old);
err = -EXDEV;
- if (OVL_TYPE_MERGE_OR_LOWER(old_type) && is_dir)
+ if (is_dir && ovl_type_merge_or_lower(old))
goto out;
-
- if (new->d_inode) {
- if (d_is_dir(new))
- new_is_dir = true;
-
- new_type = ovl_path_type(new);
- err = -EXDEV;
- if (!overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir)
- goto out;
- } else {
- new_type = __OVL_PATH_UPPER;
- }
+ if (!overwrite && new_is_dir && ovl_type_merge_or_lower(new))
+ goto out;
err = ovl_want_write(old);
if (err)
@@ -828,7 +822,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
old_cred = ovl_override_creds(old->d_sb);
- if (overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir) {
+ if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) {
opaquedir = ovl_check_empty_and_clear(new);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir)) {