1 files changed, 340 insertions, 0 deletions
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
new file mode 100644
index 000000000..29d5a0e0c
--- /dev/null
+++ b/fs/ufs/namei.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/ufs/namei.c
+ *
+ * Migration to usage of "page cache" on May 2006 by
+ * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ *
+ *  from
+ *
+ *  linux/fs/ext2/namei.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/fs/minix/namei.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+
+#include "ufs_fs.h"
+#include "ufs.h"
+#include "util.h"
+
+static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
+{
+	int err = ufs_add_link(dentry, inode);
+	if (!err) {
+		d_instantiate_new(dentry, inode);
+		return 0;
+	}
+	inode_dec_link_count(inode);
+	discard_new_inode(inode);
+	return err;
+}
+
+static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
+{
+	struct inode * inode = NULL;
+	ino_t ino;
+	
+	if (dentry->d_name.len > UFS_MAXNAMLEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	ino = ufs_inode_by_name(dir, &dentry->d_name);
+	if (ino)
+		inode = ufs_iget(dir->i_sb, ino);
+	return d_splice_alias(inode, dentry);
+}
+
+/*
+ * By the time this is called, we already have created
+ * the directory cache entry for the new file, but it
+ * is so far negative - it has no inode.
+ *
+ * If the create succeeds, we fill in the inode information
+ * with d_instantiate(). 
+ */
+static int ufs_create (struct user_namespace * mnt_userns,
+		struct inode * dir, struct dentry * dentry, umode_t mode,
+		bool excl)
+{
+	struct inode *inode;
+
+	inode = ufs_new_inode(dir, mode);
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	inode->i_op = &ufs_file_inode_operations;
+	inode->i_fop = &ufs_file_operations;
+	inode->i_mapping->a_ops = &ufs_aops;
+	mark_inode_dirty(inode);
+	return ufs_add_nondir(dentry, inode);
+}
+
+static int ufs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+	struct inode *inode;
+	int err;
+
+	if (!old_valid_dev(rdev))
+		return -EINVAL;
+
+	inode = ufs_new_inode(dir, mode);
+	err = PTR_ERR(inode);
+	if (!IS_ERR(inode)) {
+		init_special_inode(inode, mode, rdev);
+		ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
+		mark_inode_dirty(inode);
+		err = ufs_add_nondir(dentry, inode);
+	}
+	return err;
+}
+
+static int ufs_symlink (struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry * dentry, const char * symname)
+{
+	struct super_block * sb = dir->i_sb;
+	int err;
+	unsigned l = strlen(symname)+1;
+	struct inode * inode;
+
+	if (l > sb->s_blocksize)
+		return -ENAMETOOLONG;
+
+	inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
+	err = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		return err;
+
+	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
+		/* slow symlink */
+		inode->i_op = &page_symlink_inode_operations;
+		inode_nohighmem(inode);
+		inode->i_mapping->a_ops = &ufs_aops;
+		err = page_symlink(inode, symname, l);
+		if (err)
+			goto out_fail;
+	} else {
+		/* fast symlink */
+		inode->i_op = &simple_symlink_inode_operations;
+		inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
+		memcpy(inode->i_link, symname, l);
+		inode->i_size = l-1;
+	}
+	mark_inode_dirty(inode);
+
+	return ufs_add_nondir(dentry, inode);
+
+out_fail:
+	inode_dec_link_count(inode);
+	discard_new_inode(inode);
+	return err;
+}
+
+static int ufs_link (struct dentry * old_dentry, struct inode * dir,
+	struct dentry *dentry)
+{
+	struct inode *inode = d_inode(old_dentry);
+	int error;
+
+	inode->i_ctime = current_time(inode);
+	inode_inc_link_count(inode);
+	ihold(inode);
+
+	error = ufs_add_link(dentry, inode);
+	if (error) {
+		inode_dec_link_count(inode);
+		iput(inode);
+	} else
+		d_instantiate(dentry, inode);
+	return error;
+}
+
+static int ufs_mkdir(struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry * dentry, umode_t mode)
+{
+	struct inode * inode;
+	int err;
+
+	inode_inc_link_count(dir);
+
+	inode = ufs_new_inode(dir, S_IFDIR|mode);
+	err = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		goto out_dir;
+
+	inode->i_op = &ufs_dir_inode_operations;
+	inode->i_fop = &ufs_dir_operations;
+	inode->i_mapping->a_ops = &ufs_aops;
+
+	inode_inc_link_count(inode);
+
+	err = ufs_make_empty(inode, dir);
+	if (err)
+		goto out_fail;
+
+	err = ufs_add_link(dentry, inode);
+	if (err)
+		goto out_fail;
+
+	d_instantiate_new(dentry, inode);
+	return 0;
+
+out_fail:
+	inode_dec_link_count(inode);
+	inode_dec_link_count(inode);
+	discard_new_inode(inode);
+out_dir:
+	inode_dec_link_count(dir);
+	return err;
+}
+
+static int ufs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct inode * inode = d_inode(dentry);
+	struct ufs_dir_entry *de;
+	struct page *page;
+	int err = -ENOENT;
+
+	de = ufs_find_entry(dir, &dentry->d_name, &page);
+	if (!de)
+		goto out;
+
+	err = ufs_delete_entry(dir, de, page);
+	if (err)
+		goto out;
+
+	inode->i_ctime = dir->i_ctime;
+	inode_dec_link_count(inode);
+	err = 0;
+out:
+	return err;
+}
+
+static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
+{
+	struct inode * inode = d_inode(dentry);
+	int err= -ENOTEMPTY;
+
+	if (ufs_empty_dir (inode)) {
+		err = ufs_unlink(dir, dentry);
+		if (!err) {
+			inode->i_size = 0;
+			inode_dec_link_count(inode);
+			inode_dec_link_count(dir);
+		}
+	}
+	return err;
+}
+
+static int ufs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
+{
+	struct inode *old_inode = d_inode(old_dentry);
+	struct inode *new_inode = d_inode(new_dentry);
+	struct page *dir_page = NULL;
+	struct ufs_dir_entry * dir_de = NULL;
+	struct page *old_page;
+	struct ufs_dir_entry *old_de;
+	int err = -ENOENT;
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
+	if (!old_de)
+		goto out;
+
+	if (S_ISDIR(old_inode->i_mode)) {
+		err = -EIO;
+		dir_de = ufs_dotdot(old_inode, &dir_page);
+		if (!dir_de)
+			goto out_old;
+	}
+
+	if (new_inode) {
+		struct page *new_page;
+		struct ufs_dir_entry *new_de;
+
+		err = -ENOTEMPTY;
+		if (dir_de && !ufs_empty_dir(new_inode))
+			goto out_dir;
+
+		err = -ENOENT;
+		new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
+		if (!new_de)
+			goto out_dir;
+		ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
+		new_inode->i_ctime = current_time(new_inode);
+		if (dir_de)
+			drop_nlink(new_inode);
+		inode_dec_link_count(new_inode);
+	} else {
+		err = ufs_add_link(new_dentry, old_inode);
+		if (err)
+			goto out_dir;
+		if (dir_de)
+			inode_inc_link_count(new_dir);
+	}
+
+	/*
+	 * Like most other Unix systems, set the ctime for inodes on a
+ 	 * rename.
+	 */
+	old_inode->i_ctime = current_time(old_inode);
+
+	ufs_delete_entry(old_dir, old_de, old_page);
+	mark_inode_dirty(old_inode);
+
+	if (dir_de) {
+		if (old_dir != new_dir)
+			ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
+		else {
+			kunmap(dir_page);
+			put_page(dir_page);
+		}
+		inode_dec_link_count(old_dir);
+	}
+	return 0;
+
+
+out_dir:
+	if (dir_de) {
+		kunmap(dir_page);
+		put_page(dir_page);
+	}
+out_old:
+	kunmap(old_page);
+	put_page(old_page);
+out:
+	return err;
+}
+
+const struct inode_operations ufs_dir_inode_operations = {
+	.create		= ufs_create,
+	.lookup		= ufs_lookup,
+	.link		= ufs_link,
+	.unlink		= ufs_unlink,
+	.symlink	= ufs_symlink,
+	.mkdir		= ufs_mkdir,
+	.rmdir		= ufs_rmdir,
+	.mknod		= ufs_mknod,
+	.rename		= ufs_rename,
+};