Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm...

[linux-drm-fsl-dcu.git] / fs / libfs.c

diff --git a/fs/libfs.c b/fs/libfs.c
index 65e1feca8b982c55bff37e5a85529f8cb0d4121e..88a4cb418756c29c5273432ac0f364c340c7f6f7 100644 (file)
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1108,3 +1108,98 @@ const struct inode_operations simple_symlink_inode_operations = {
        .readlink = generic_readlink
 };
 EXPORT_SYMBOL(simple_symlink_inode_operations);
+
+/*
+ * Operations for a permanently empty directory.
+ */
+static struct dentry *empty_dir_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+       return ERR_PTR(-ENOENT);
+}
+
+static int empty_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                                struct kstat *stat)
+{
+       struct inode *inode = d_inode(dentry);
+       generic_fillattr(inode, stat);
+       return 0;
+}
+
+static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       return -EPERM;
+}
+
+static int empty_dir_setxattr(struct dentry *dentry, const char *name,
+                             const void *value, size_t size, int flags)
+{
+       return -EOPNOTSUPP;
+}
+
+static ssize_t empty_dir_getxattr(struct dentry *dentry, const char *name,
+                                 void *value, size_t size)
+{
+       return -EOPNOTSUPP;
+}
+
+static int empty_dir_removexattr(struct dentry *dentry, const char *name)
+{
+       return -EOPNOTSUPP;
+}
+
+static ssize_t empty_dir_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+       return -EOPNOTSUPP;
+}
+
+static const struct inode_operations empty_dir_inode_operations = {
+       .lookup         = empty_dir_lookup,
+       .permission     = generic_permission,
+       .setattr        = empty_dir_setattr,
+       .getattr        = empty_dir_getattr,
+       .setxattr       = empty_dir_setxattr,
+       .getxattr       = empty_dir_getxattr,
+       .removexattr    = empty_dir_removexattr,
+       .listxattr      = empty_dir_listxattr,
+};
+
+static loff_t empty_dir_llseek(struct file *file, loff_t offset, int whence)
+{
+       /* An empty directory has two entries . and .. at offsets 0 and 1 */
+       return generic_file_llseek_size(file, offset, whence, 2, 2);
+}
+
+static int empty_dir_readdir(struct file *file, struct dir_context *ctx)
+{
+       dir_emit_dots(file, ctx);
+       return 0;
+}
+
+static const struct file_operations empty_dir_operations = {
+       .llseek         = empty_dir_llseek,
+       .read           = generic_read_dir,
+       .iterate        = empty_dir_readdir,
+       .fsync          = noop_fsync,
+};
+
+
+void make_empty_dir_inode(struct inode *inode)
+{
+       set_nlink(inode, 2);
+       inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
+       inode->i_uid = GLOBAL_ROOT_UID;
+       inode->i_gid = GLOBAL_ROOT_GID;
+       inode->i_rdev = 0;
+       inode->i_size = 2;
+       inode->i_blkbits = PAGE_SHIFT;
+       inode->i_blocks = 0;
+
+       inode->i_op = &empty_dir_inode_operations;
+       inode->i_fop = &empty_dir_operations;
+}
+
+bool is_empty_dir_inode(struct inode *inode)
+{
+       return (inode->i_fop == &empty_dir_operations) &&
+               (inode->i_op == &empty_dir_inode_operations);
+}