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authorKonstantin Komarov <almaz.alexandrovich@paragon-software.com>2021-08-13 16:21:29 +0200
committerKonstantin Komarov <almaz.alexandrovich@paragon-software.com>2021-08-13 16:55:49 +0200
commit4342306f0f0d5ff4315a204d315c1b51b914fca5 (patch)
tree331c87db643430a51e9d5a7ad629ca16a5f5d31e /fs/ntfs3/namei.c
parentfs/ntfs3: Add bitmap (diff)
downloadlinux-4342306f0f0d5ff4315a204d315c1b51b914fca5.tar.xz
linux-4342306f0f0d5ff4315a204d315c1b51b914fca5.zip
fs/ntfs3: Add file operations and implementation
This adds file operations and implementation Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Diffstat (limited to 'fs/ntfs3/namei.c')
-rw-r--r--fs/ntfs3/namei.c539
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