fs/ntfs3: Add file operations and implementation

This adds file operations and implementation

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

1 files changed, 539 insertions, 0 deletions

diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c
new file mode 100644
index 000000000000..b1ccd66172f2
--- /dev/null
+++ b/fs/ntfs3/namei.c
@@ -0,0 +1,539 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/iversion.h>
+#include <linux/namei.h>
+#include <linux/nls.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+
+/*
+ * fill_name_de
+ *
+ * formats NTFS_DE in 'buf'
+ */
+int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
+		 const struct cpu_str *uni)
+{
+	int err;
+	struct NTFS_DE *e = buf;
+	u16 data_size;
+	struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
+
+#ifndef CONFIG_NTFS3_64BIT_CLUSTER
+	e->ref.high = fname->home.high = 0;
+#endif
+	if (uni) {
+#ifdef __BIG_ENDIAN
+		int ulen = uni->len;
+		__le16 *uname = fname->name;
+		const u16 *name_cpu = uni->name;
+
+		while (ulen--)
+			*uname++ = cpu_to_le16(*name_cpu++);
+#else
+		memcpy(fname->name, uni->name, uni->len * sizeof(u16));
+#endif
+		fname->name_len = uni->len;
+
+	} else {
+		/* Convert input string to unicode */
+		err = ntfs_nls_to_utf16(sbi, name->name, name->len,
+					(struct cpu_str *)&fname->name_len,
+					NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
+		if (err < 0)
+			return err;
+	}
+
+	fname->type = FILE_NAME_POSIX;
+	data_size = fname_full_size(fname);
+
+	e->size = cpu_to_le16(QuadAlign(data_size) + sizeof(struct NTFS_DE));
+	e->key_size = cpu_to_le16(data_size);
+	e->flags = 0;
+	e->res = 0;
+
+	return 0;
+}
+
+/*
+ * ntfs_lookup
+ *
+ * inode_operations::lookup
+ */
+static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
+				  u32 flags)
+{
+	struct ntfs_inode *ni = ntfs_i(dir);
+	struct cpu_str *uni = __getname();
+	struct inode *inode;
+	int err;
+
+	if (!uni)
+		inode = ERR_PTR(-ENOMEM);
+	else {
+		err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
+					dentry->d_name.len, uni, NTFS_NAME_LEN,
+					UTF16_HOST_ENDIAN);
+		if (err < 0)
+			inode = ERR_PTR(err);
+		else {
+			ni_lock(ni);
+			inode = dir_search_u(dir, uni, NULL);
+			ni_unlock(ni);
+		}
+		__putname(uni);
+	}
+
+	return d_splice_alias(inode, dentry);
+}
+
+/*
+ * ntfs_create
+ *
+ * inode_operations::create
+ */
+static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
+{
+	struct ntfs_inode *ni = ntfs_i(dir);
+	struct inode *inode;
+
+	ni_lock_dir(ni);
+
+	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode,
+				  0, NULL, 0, NULL);
+
+	ni_unlock(ni);
+
+	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_mknod
+ *
+ * inode_operations::mknod
+ */
+static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+	struct ntfs_inode *ni = ntfs_i(dir);
+	struct inode *inode;
+
+	ni_lock_dir(ni);
+
+	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev,
+				  NULL, 0, NULL);
+
+	ni_unlock(ni);
+
+	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_link
+ *
+ * inode_operations::link
+ */
+static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
+{
+	int err;
+	struct inode *inode = d_inode(ode);
+	struct ntfs_inode *ni = ntfs_i(inode);
+
+	if (S_ISDIR(inode->i_mode))
+		return -EPERM;
+
+	if (inode->i_nlink >= NTFS_LINK_MAX)
+		return -EMLINK;
+
+	ni_lock_dir(ntfs_i(dir));
+	if (inode != dir)
+		ni_lock(ni);
+
+	dir->i_ctime = dir->i_mtime = inode->i_ctime = current_time(inode);
+	inc_nlink(inode);
+	ihold(inode);
+
+	err = ntfs_link_inode(inode, de);
+	if (!err) {
+		mark_inode_dirty(inode);
+		mark_inode_dirty(dir);
+		d_instantiate(de, inode);
+	} else {
+		drop_nlink(inode);
+		iput(inode);
+	}
+
+	if (inode != dir)
+		ni_unlock(ni);
+	ni_unlock(ntfs_i(dir));
+
+	return err;
+}
+
+/*
+ * ntfs_unlink
+ *
+ * inode_operations::unlink
+ */
+static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct ntfs_inode *ni = ntfs_i(dir);
+	int err;
+
+	ni_lock_dir(ni);
+
+	err = ntfs_unlink_inode(dir, dentry);
+
+	ni_unlock(ni);
+
+	return err;
+}
+
+/*
+ * ntfs_symlink
+ *
+ * inode_operations::symlink
+ */
+static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *symname)
+{
+	u32 size = strlen(symname);
+	struct inode *inode;
+	struct ntfs_inode *ni = ntfs_i(dir);
+
+	ni_lock_dir(ni);
+
+	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777,
+				  0, symname, size, NULL);
+
+	ni_unlock(ni);
+
+	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_mkdir
+ *
+ * inode_operations::mkdir
+ */
+static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
+{
+	struct inode *inode;
+	struct ntfs_inode *ni = ntfs_i(dir);
+
+	ni_lock_dir(ni);
+
+	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode,
+				  0, NULL, 0, NULL);
+
+	ni_unlock(ni);
+
+	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
+}
+
+/*
+ * ntfs_rmdir
+ *
+ * inode_operations::rm_dir
+ */
+static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct ntfs_inode *ni = ntfs_i(dir);
+	int err;
+
+	ni_lock_dir(ni);
+
+	err = ntfs_unlink_inode(dir, dentry);
+
+	ni_unlock(ni);
+
+	return err;
+}
+
+/*
+ * ntfs_rename
+ *
+ * inode_operations::rename
+ */
+static int ntfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, u32 flags)
+{
+	int err;
+	struct super_block *sb = old_dir->i_sb;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct ntfs_inode *old_dir_ni = ntfs_i(old_dir);
+	struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
+	struct ntfs_inode *old_ni;
+	struct ATTR_FILE_NAME *old_name, *new_name, *fname;
+	u8 name_type;
+	bool is_same;
+	struct inode *old_inode, *new_inode;
+	struct NTFS_DE *old_de, *new_de;
+	struct ATTRIB *attr;
+	struct ATTR_LIST_ENTRY *le;
+	u16 new_de_key_size;
+
+	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
+	static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
+		      1024);
+	static_assert(PATH_MAX >= 4 * 1024);
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	old_inode = d_inode(old_dentry);
+	new_inode = d_inode(new_dentry);
+
+	old_ni = ntfs_i(old_inode);
+
+	is_same = old_dentry->d_name.len == new_dentry->d_name.len &&
+		  !memcmp(old_dentry->d_name.name, new_dentry->d_name.name,
+			  old_dentry->d_name.len);
+
+	if (is_same && old_dir == new_dir) {
+		/* Nothing to do */
+		err = 0;
+		goto out;
+	}
+
+	if (ntfs_is_meta_file(sbi, old_inode->i_ino)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (new_inode) {
+		/*target name exists. unlink it*/
+		dget(new_dentry);
+		ni_lock_dir(new_dir_ni);
+		err = ntfs_unlink_inode(new_dir, new_dentry);
+		ni_unlock(new_dir_ni);
+		dput(new_dentry);
+		if (err)
+			goto out;
+	}
+
+	/* allocate PATH_MAX bytes */
+	old_de = __getname();
+	if (!old_de) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = fill_name_de(sbi, old_de, &old_dentry->d_name, NULL);
+	if (err < 0)
+		goto out1;
+
+	old_name = (struct ATTR_FILE_NAME *)(old_de + 1);
+
+	if (is_same) {
+		new_de = old_de;
+	} else {
+		new_de = Add2Ptr(old_de, 1024);
+		err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
+		if (err < 0)
+			goto out1;
+	}
+
+	ni_lock_dir(old_dir_ni);
+	ni_lock(old_ni);
+
+	mi_get_ref(&old_dir_ni->mi, &old_name->home);
+
+	/*get pointer to file_name in mft*/
+	fname = ni_fname_name(old_ni, (struct cpu_str *)&old_name->name_len,
+			      &old_name->home, &le);
+	if (!fname) {
+		err = -EINVAL;
+		goto out2;
+	}
+
+	/* Copy fname info from record into new fname */
+	new_name = (struct ATTR_FILE_NAME *)(new_de + 1);
+	memcpy(&new_name->dup, &fname->dup, sizeof(fname->dup));
+
+	name_type = paired_name(fname->type);
+
+	/* remove first name from directory */
+	err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni, old_de + 1,
+				le16_to_cpu(old_de->key_size), sbi);
+	if (err)
+		goto out3;
+
+	/* remove first name from mft */
+	err = ni_remove_attr_le(old_ni, attr_from_name(fname), le);
+	if (err)
+		goto out4;
+
+	le16_add_cpu(&old_ni->mi.mrec->hard_links, -1);
+	old_ni->mi.dirty = true;
+
+	if (name_type != FILE_NAME_POSIX) {
+		/* get paired name */
+		fname = ni_fname_type(old_ni, name_type, &le);
+		if (fname) {
+			/* remove second name from directory */
+			err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni,
+						fname, fname_full_size(fname),
+						sbi);
+			if (err)
+				goto out5;
+
+			/* remove second name from mft */
+			err = ni_remove_attr_le(old_ni, attr_from_name(fname),
+						le);
+			if (err)
+				goto out6;
+
+			le16_add_cpu(&old_ni->mi.mrec->hard_links, -1);
+			old_ni->mi.dirty = true;
+		}
+	}
+
+	/* Add new name */
+	mi_get_ref(&old_ni->mi, &new_de->ref);
+	mi_get_ref(&ntfs_i(new_dir)->mi, &new_name->home);
+
+	new_de_key_size = le16_to_cpu(new_de->key_size);
+
+	/* insert new name in mft */
+	err = ni_insert_resident(old_ni, new_de_key_size, ATTR_NAME, NULL, 0,
+				 &attr, NULL);
+	if (err)
+		goto out7;
+
+	attr->res.flags = RESIDENT_FLAG_INDEXED;
+
+	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), new_name, new_de_key_size);
+
+	le16_add_cpu(&old_ni->mi.mrec->hard_links, 1);
+	old_ni->mi.dirty = true;
+
+	/* insert new name in directory */
+	err = indx_insert_entry(&new_dir_ni->dir, new_dir_ni, new_de, sbi,
+				NULL);
+	if (err)
+		goto out8;
+
+	if (IS_DIRSYNC(new_dir))
+		err = ntfs_sync_inode(old_inode);
+	else
+		mark_inode_dirty(old_inode);
+
+	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
+	if (IS_DIRSYNC(old_dir))
+		(void)ntfs_sync_inode(old_dir);
+	else
+		mark_inode_dirty(old_dir);
+
+	if (old_dir != new_dir) {
+		new_dir->i_mtime = new_dir->i_ctime = old_dir->i_ctime;
+		mark_inode_dirty(new_dir);
+	}
+
+	if (old_inode) {
+		old_inode->i_ctime = old_dir->i_ctime;
+		mark_inode_dirty(old_inode);
+	}
+
+	err = 0;
+	/* normal way */
+	goto out2;
+
+out8:
+	/* undo
+	 * ni_insert_resident(old_ni, new_de_key_size, ATTR_NAME, NULL, 0,
+	 *			 &attr, NULL);
+	 */
+	mi_remove_attr(&old_ni->mi, attr);
+out7:
+	/* undo
+	 * ni_remove_attr_le(old_ni, attr_from_name(fname), le);
+	 */
+out6:
+	/* undo
+	 * indx_delete_entry(&old_dir_ni->dir, old_dir_ni,
+	 *					fname, fname_full_size(fname),
+	 *					sbi);
+	 */
+out5:
+	/* undo
+	 * ni_remove_attr_le(old_ni, attr_from_name(fname), le);
+	 */
+out4:
+	/* undo:
+	 * indx_delete_entry(&old_dir_ni->dir, old_dir_ni, old_de + 1,
+	 *			old_de->key_size, NULL);
+	 */
+out3:
+out2:
+	ni_unlock(old_ni);
+	ni_unlock(old_dir_ni);
+out1:
+	__putname(old_de);
+out:
+	return err;
+}
+
+struct dentry *ntfs3_get_parent(struct dentry *child)
+{
+	struct inode *inode = d_inode(child);
+	struct ntfs_inode *ni = ntfs_i(inode);
+
+	struct ATTR_LIST_ENTRY *le = NULL;
+	struct ATTRIB *attr = NULL;
+	struct ATTR_FILE_NAME *fname;
+
+	while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
+				    NULL))) {
+		fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
+		if (!fname)
+			continue;
+
+		return d_obtain_alias(
+			ntfs_iget5(inode->i_sb, &fname->home, NULL));
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+
+// clang-format off
+const struct inode_operations ntfs_dir_inode_operations = {
+	.lookup		= ntfs_lookup,
+	.create		= ntfs_create,
+	.link		= ntfs_link,
+	.unlink		= ntfs_unlink,
+	.symlink	= ntfs_symlink,
+	.mkdir		= ntfs_mkdir,
+	.rmdir		= ntfs_rmdir,
+	.mknod		= ntfs_mknod,
+	.rename		= ntfs_rename,
+	.permission	= ntfs_permission,
+	.get_acl	= ntfs_get_acl,
+	.set_acl	= ntfs_set_acl,
+	.setattr	= ntfs3_setattr,
+	.getattr	= ntfs_getattr,
+	.listxattr	= ntfs_listxattr,
+	.fiemap		= ntfs_fiemap,
+};
+
+const struct inode_operations ntfs_special_inode_operations = {
+	.setattr	= ntfs3_setattr,
+	.getattr	= ntfs_getattr,
+	.listxattr	= ntfs_listxattr,
+	.get_acl	= ntfs_get_acl,
+	.set_acl	= ntfs_set_acl,
+};
+// clang-format on