diff options
| -rw-r--r-- | fs/overlayfs/dir.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 1b181292a624..1d59c466d199 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -114,6 +114,37 @@ kill_whiteout: goto out; } +static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry, + umode_t mode) +{ + int err; + struct dentry *d, *dentry = *newdentry; + + err = ovl_do_mkdir(dir, dentry, mode); + if (err) + return err; + + if (likely(!d_unhashed(dentry))) + return 0; + + /* + * vfs_mkdir() may succeed and leave the dentry passed + * to it unhashed and negative. If that happens, try to + * lookup a new hashed and positive dentry. + */ + d = lookup_one_len(dentry->d_name.name, dentry->d_parent, + dentry->d_name.len); + if (IS_ERR(d)) { + pr_warn("overlayfs: failed lookup after mkdir (%pd2, err=%i).\n", + dentry, err); + return PTR_ERR(d); + } + dput(dentry); + *newdentry = d; + + return 0; +} + struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, struct ovl_cattr *attr) { @@ -135,7 +166,8 @@ struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, break; case S_IFDIR: - err = ovl_do_mkdir(dir, newdentry, attr->mode); + /* mkdir is special... */ + err = ovl_mkdir_real(dir, &newdentry, attr->mode); break; case S_IFCHR: |