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fs/ntfs3: Add file operations and implementation

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This adds file operations and implementation

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2021-08-13 17:21:29 +03:00
parent 3f3b442b5a
commit 4342306f0f
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GPG key ID: A9B0331F832407B6
6 changed files with 7178 additions and 0 deletions
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
* directory handling functions for ntfs-based filesystems
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/iversion.h>
#include <linux/nls.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
/*
* Convert little endian utf16 to nls string
*/
int ntfs_utf16_to_nls(struct ntfs_sb_info *sbi, const struct le_str *uni,
u8 *buf, int buf_len)
{
int ret, uni_len, warn;
const __le16 *ip;
u8 *op;
struct nls_table *nls = sbi->options.nls;
static_assert(sizeof(wchar_t) == sizeof(__le16));
if (!nls) {
/* utf16 -> utf8 */
ret = utf16s_to_utf8s((wchar_t *)uni->name, uni->len,
UTF16_LITTLE_ENDIAN, buf, buf_len);
buf[ret] = '\0';
return ret;
}
ip = uni->name;
op = buf;
uni_len = uni->len;
warn = 0;
while (uni_len--) {
u16 ec;
int charlen;
char dump[5];
if (buf_len < NLS_MAX_CHARSET_SIZE) {
ntfs_warn(sbi->sb,
"filename was truncated while converting.");
break;
}
ec = le16_to_cpu(*ip++);
charlen = nls->uni2char(ec, op, buf_len);
if (charlen > 0) {
op += charlen;
buf_len -= charlen;
continue;
}
*op++ = '_';
buf_len -= 1;
if (warn)
continue;
warn = 1;
hex_byte_pack(&dump[0], ec >> 8);
hex_byte_pack(&dump[2], ec);
dump[4] = 0;
ntfs_err(sbi->sb, "failed to convert \"%s\" to %s", dump,
nls->charset);
}
*op = '\0';
return op - buf;
}
// clang-format off
#define PLANE_SIZE 0x00010000
#define SURROGATE_PAIR 0x0000d800
#define SURROGATE_LOW 0x00000400
#define SURROGATE_BITS 0x000003ff
// clang-format on
/*
* modified version of put_utf16 from fs/nls/nls_base.c
* is sparse warnings free
*/
static inline void put_utf16(wchar_t *s, unsigned int c,
enum utf16_endian endian)
{
static_assert(sizeof(wchar_t) == sizeof(__le16));
static_assert(sizeof(wchar_t) == sizeof(__be16));
switch (endian) {
default:
*s = (wchar_t)c;
break;
case UTF16_LITTLE_ENDIAN:
*(__le16 *)s = __cpu_to_le16(c);
break;
case UTF16_BIG_ENDIAN:
*(__be16 *)s = __cpu_to_be16(c);
break;
}
}
/*
* modified version of 'utf8s_to_utf16s' allows to
* detect -ENAMETOOLONG without writing out of expected maximum
*/
static int _utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
wchar_t *pwcs, int maxout)
{
u16 *op;
int size;
unicode_t u;
op = pwcs;
while (inlen > 0 && *s) {
if (*s & 0x80) {
size = utf8_to_utf32(s, inlen, &u);
if (size < 0)
return -EINVAL;
s += size;
inlen -= size;
if (u >= PLANE_SIZE) {
if (maxout < 2)
return -ENAMETOOLONG;
u -= PLANE_SIZE;
put_utf16(op++,
SURROGATE_PAIR |
((u >> 10) & SURROGATE_BITS),
endian);
put_utf16(op++,
SURROGATE_PAIR | SURROGATE_LOW |
(u & SURROGATE_BITS),
endian);
maxout -= 2;
} else {
if (maxout < 1)
return -ENAMETOOLONG;
put_utf16(op++, u, endian);
maxout--;
}
} else {
if (maxout < 1)
return -ENAMETOOLONG;
put_utf16(op++, *s++, endian);
inlen--;
maxout--;
}
}
return op - pwcs;
}
/*
* Convert input string to utf16
*
* name, name_len - input name
* uni, max_ulen - destination memory
* endian - endian of target utf16 string
*
* This function is called:
* - to create ntfs name
* - to create symlink
*
* returns utf16 string length or error (if negative)
*/
int ntfs_nls_to_utf16(struct ntfs_sb_info *sbi, const u8 *name, u32 name_len,
struct cpu_str *uni, u32 max_ulen,
enum utf16_endian endian)
{
int ret, slen;
const u8 *end;
struct nls_table *nls = sbi->options.nls;
u16 *uname = uni->name;
static_assert(sizeof(wchar_t) == sizeof(u16));
if (!nls) {
/* utf8 -> utf16 */
ret = _utf8s_to_utf16s(name, name_len, endian, uname, max_ulen);
uni->len = ret;
return ret;
}
for (ret = 0, end = name + name_len; name < end; ret++, name += slen) {
if (ret >= max_ulen)
return -ENAMETOOLONG;
slen = nls->char2uni(name, end - name, uname + ret);
if (!slen)
return -EINVAL;
if (slen < 0)
return slen;
}
#ifdef __BIG_ENDIAN
if (endian == UTF16_LITTLE_ENDIAN) {
int i = ret;
while (i--) {
__cpu_to_le16s(uname);
uname++;
}
}
#else
if (endian == UTF16_BIG_ENDIAN) {
int i = ret;
while (i--) {
__cpu_to_be16s(uname);
uname++;
}
}
#endif
uni->len = ret;
return ret;
}
/* helper function */
struct inode *dir_search_u(struct inode *dir, const struct cpu_str *uni,
struct ntfs_fnd *fnd)
{
int err = 0;
struct super_block *sb = dir->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(dir);
struct NTFS_DE *e;
int diff;
struct inode *inode = NULL;
struct ntfs_fnd *fnd_a = NULL;
if (!fnd) {
fnd_a = fnd_get();
if (!fnd_a) {
err = -ENOMEM;
goto out;
}
fnd = fnd_a;
}
err = indx_find(&ni->dir, ni, NULL, uni, 0, sbi, &diff, &e, fnd);
if (err)
goto out;
if (diff) {
err = -ENOENT;
goto out;
}
inode = ntfs_iget5(sb, &e->ref, uni);
if (!IS_ERR(inode) && is_bad_inode(inode)) {
iput(inode);
err = -EINVAL;
}
out:
fnd_put(fnd_a);
return err == -ENOENT ? NULL : err ? ERR_PTR(err) : inode;
}
static inline int ntfs_filldir(struct ntfs_sb_info *sbi, struct ntfs_inode *ni,
const struct NTFS_DE *e, u8 *name,
struct dir_context *ctx)
{
const struct ATTR_FILE_NAME *fname;
unsigned long ino;
int name_len;
u32 dt_type;
fname = Add2Ptr(e, sizeof(struct NTFS_DE));
if (fname->type == FILE_NAME_DOS)
return 0;
if (!mi_is_ref(&ni->mi, &fname->home))
return 0;
ino = ino_get(&e->ref);
if (ino == MFT_REC_ROOT)
return 0;
/* Skip meta files ( unless option to show metafiles is set ) */
if (!sbi->options.showmeta && ntfs_is_meta_file(sbi, ino))
return 0;
if (sbi->options.nohidden && (fname->dup.fa & FILE_ATTRIBUTE_HIDDEN))
return 0;
name_len = ntfs_utf16_to_nls(sbi, (struct le_str *)&fname->name_len,
name, PATH_MAX);
if (name_len <= 0) {
ntfs_warn(sbi->sb, "failed to convert name for inode %lx.",
ino);
return 0;
}
dt_type = (fname->dup.fa & FILE_ATTRIBUTE_DIRECTORY) ? DT_DIR : DT_REG;
return !dir_emit(ctx, (s8 *)name, name_len, ino, dt_type);
}
/*
* ntfs_read_hdr
*
* helper function 'ntfs_readdir'
*/
static int ntfs_read_hdr(struct ntfs_sb_info *sbi, struct ntfs_inode *ni,
const struct INDEX_HDR *hdr, u64 vbo, u64 pos,
u8 *name, struct dir_context *ctx)
{
int err;
const struct NTFS_DE *e;
u32 e_size;
u32 end = le32_to_cpu(hdr->used);
u32 off = le32_to_cpu(hdr->de_off);
for (;; off += e_size) {
if (off + sizeof(struct NTFS_DE) > end)
return -1;
e = Add2Ptr(hdr, off);
e_size = le16_to_cpu(e->size);
if (e_size < sizeof(struct NTFS_DE) || off + e_size > end)
return -1;
if (de_is_last(e))
return 0;
/* Skip already enumerated*/
if (vbo + off < pos)
continue;
if (le16_to_cpu(e->key_size) < SIZEOF_ATTRIBUTE_FILENAME)
return -1;
ctx->pos = vbo + off;
/* Submit the name to the filldir callback. */
err = ntfs_filldir(sbi, ni, e, name, ctx);
if (err)
return err;
}
}
/*
* file_operations::iterate_shared
*
* Use non sorted enumeration.
* We have an example of broken volume where sorted enumeration
* counts each name twice
*/
static int ntfs_readdir(struct file *file, struct dir_context *ctx)
{
const struct INDEX_ROOT *root;
u64 vbo;
size_t bit;
loff_t eod;
int err = 0;
struct inode *dir = file_inode(file);
struct ntfs_inode *ni = ntfs_i(dir);
struct super_block *sb = dir->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
loff_t i_size = i_size_read(dir);
u32 pos = ctx->pos;
u8 *name = NULL;
struct indx_node *node = NULL;
u8 index_bits = ni->dir.index_bits;
/* name is a buffer of PATH_MAX length */
static_assert(NTFS_NAME_LEN * 4 < PATH_MAX);
eod = i_size + sbi->record_size;
if (pos >= eod)
return 0;
if (!dir_emit_dots(file, ctx))
return 0;
/* allocate PATH_MAX bytes */
name = __getname();
if (!name)
return -ENOMEM;
if (!ni->mi_loaded && ni->attr_list.size) {
/*
* directory inode is locked for read
* load all subrecords to avoid 'write' access to 'ni' during
* directory reading
*/
ni_lock(ni);
if (!ni->mi_loaded && ni->attr_list.size) {
err = ni_load_all_mi(ni);
if (!err)
ni->mi_loaded = true;
}
ni_unlock(ni);
if (err)
goto out;
}
root = indx_get_root(&ni->dir, ni, NULL, NULL);
if (!root) {
err = -EINVAL;
goto out;
}
if (pos >= sbi->record_size) {
bit = (pos - sbi->record_size) >> index_bits;
} else {
err = ntfs_read_hdr(sbi, ni, &root->ihdr, 0, pos, name, ctx);
if (err)
goto out;
bit = 0;
}
if (!i_size) {
ctx->pos = eod;
goto out;
}
for (;;) {
vbo = (u64)bit << index_bits;
if (vbo >= i_size) {
ctx->pos = eod;
goto out;
}
err = indx_used_bit(&ni->dir, ni, &bit);
if (err)
goto out;
if (bit == MINUS_ONE_T) {
ctx->pos = eod;
goto out;
}
vbo = (u64)bit << index_bits;
if (vbo >= i_size) {
ntfs_inode_err(dir, "Looks like your dir is corrupt");
err = -EINVAL;
goto out;
}
err = indx_read(&ni->dir, ni, bit << ni->dir.idx2vbn_bits,
&node);
if (err)
goto out;
err = ntfs_read_hdr(sbi, ni, &node->index->ihdr,
vbo + sbi->record_size, pos, name, ctx);
if (err)
goto out;
bit += 1;
}
out:
__putname(name);
put_indx_node(node);
if (err == -ENOENT) {
err = 0;
ctx->pos = pos;
}
return err;
}
static int ntfs_dir_count(struct inode *dir, bool *is_empty, size_t *dirs,
size_t *files)
{
int err = 0;
struct ntfs_inode *ni = ntfs_i(dir);
struct NTFS_DE *e = NULL;
struct INDEX_ROOT *root;
struct INDEX_HDR *hdr;
const struct ATTR_FILE_NAME *fname;
u32 e_size, off, end;
u64 vbo = 0;
size_t drs = 0, fles = 0, bit = 0;
loff_t i_size = ni->vfs_inode.i_size;
struct indx_node *node = NULL;
u8 index_bits = ni->dir.index_bits;
if (is_empty)
*is_empty = true;
root = indx_get_root(&ni->dir, ni, NULL, NULL);
if (!root)
return -EINVAL;
hdr = &root->ihdr;
for (;;) {
end = le32_to_cpu(hdr->used);
off = le32_to_cpu(hdr->de_off);
for (; off + sizeof(struct NTFS_DE) <= end; off += e_size) {
e = Add2Ptr(hdr, off);
e_size = le16_to_cpu(e->size);
if (e_size < sizeof(struct NTFS_DE) ||
off + e_size > end)
break;
if (de_is_last(e))
break;
fname = de_get_fname(e);
if (!fname)
continue;
if (fname->type == FILE_NAME_DOS)
continue;
if (is_empty) {
*is_empty = false;
if (!dirs && !files)
goto out;
}
if (fname->dup.fa & FILE_ATTRIBUTE_DIRECTORY)
drs += 1;
else
fles += 1;
}
if (vbo >= i_size)
goto out;
err = indx_used_bit(&ni->dir, ni, &bit);
if (err)
goto out;
if (bit == MINUS_ONE_T)
goto out;
vbo = (u64)bit << index_bits;
if (vbo >= i_size)
goto out;
err = indx_read(&ni->dir, ni, bit << ni->dir.idx2vbn_bits,
&node);
if (err)
goto out;
hdr = &node->index->ihdr;
bit += 1;
vbo = (u64)bit << ni->dir.idx2vbn_bits;
}
out:
put_indx_node(node);
if (dirs)
*dirs = drs;
if (files)
*files = fles;
return err;
}
bool dir_is_empty(struct inode *dir)
{
bool is_empty = false;
ntfs_dir_count(dir, &is_empty, NULL, NULL);
return is_empty;
}
// clang-format off
const struct file_operations ntfs_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.iterate_shared = ntfs_readdir,
.fsync = generic_file_fsync,
.open = ntfs_file_open,
};
// clang-format on

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// 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

609
fs/ntfs3/record.c Normal file
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@ -0,0 +1,609 @@
// 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/nls.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
static inline int compare_attr(const struct ATTRIB *left, enum ATTR_TYPE type,
const __le16 *name, u8 name_len,
const u16 *upcase)
{
/* First, compare the type codes: */
int diff = le32_to_cpu(left->type) - le32_to_cpu(type);
if (diff)
return diff;
/*
* They have the same type code, so we have to compare the names.
*/
return ntfs_cmp_names(attr_name(left), left->name_len, name, name_len,
upcase, true);
}
/*
* mi_new_attt_id
*
* returns unused attribute id that is less than mrec->next_attr_id
*/
static __le16 mi_new_attt_id(struct mft_inode *mi)
{
u16 free_id, max_id, t16;
struct MFT_REC *rec = mi->mrec;
struct ATTRIB *attr;
__le16 id;
id = rec->next_attr_id;
free_id = le16_to_cpu(id);
if (free_id < 0x7FFF) {
rec->next_attr_id = cpu_to_le16(free_id + 1);
return id;
}
/* One record can store up to 1024/24 ~= 42 attributes */
free_id = 0;
max_id = 0;
attr = NULL;
for (;;) {
attr = mi_enum_attr(mi, attr);
if (!attr) {
rec->next_attr_id = cpu_to_le16(max_id + 1);
mi->dirty = true;
return cpu_to_le16(free_id);
}
t16 = le16_to_cpu(attr->id);
if (t16 == free_id) {
free_id += 1;
attr = NULL;
} else if (max_id < t16)
max_id = t16;
}
}
int mi_get(struct ntfs_sb_info *sbi, CLST rno, struct mft_inode **mi)
{
int err;
struct mft_inode *m = ntfs_zalloc(sizeof(struct mft_inode));
if (!m)
return -ENOMEM;
err = mi_init(m, sbi, rno);
if (err) {
ntfs_free(m);
return err;
}
err = mi_read(m, false);
if (err) {
mi_put(m);
return err;
}
*mi = m;
return 0;
}
void mi_put(struct mft_inode *mi)
{
mi_clear(mi);
ntfs_free(mi);
}
int mi_init(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno)
{
mi->sbi = sbi;
mi->rno = rno;
mi->mrec = ntfs_malloc(sbi->record_size);
if (!mi->mrec)
return -ENOMEM;
return 0;
}
/*
* mi_read
*
* reads MFT data
*/
int mi_read(struct mft_inode *mi, bool is_mft)
{
int err;
struct MFT_REC *rec = mi->mrec;
struct ntfs_sb_info *sbi = mi->sbi;
u32 bpr = sbi->record_size;
u64 vbo = (u64)mi->rno << sbi->record_bits;
struct ntfs_inode *mft_ni = sbi->mft.ni;
struct runs_tree *run = mft_ni ? &mft_ni->file.run : NULL;
struct rw_semaphore *rw_lock = NULL;
if (is_mounted(sbi)) {
if (!is_mft) {
rw_lock = &mft_ni->file.run_lock;
down_read(rw_lock);
}
}
err = ntfs_read_bh(sbi, run, vbo, &rec->rhdr, bpr, &mi->nb);
if (rw_lock)
up_read(rw_lock);
if (!err)
goto ok;
if (err == -E_NTFS_FIXUP) {
mi->dirty = true;
goto ok;
}
if (err != -ENOENT)
goto out;
if (rw_lock) {
ni_lock(mft_ni);
down_write(rw_lock);
}
err = attr_load_runs_vcn(mft_ni, ATTR_DATA, NULL, 0, &mft_ni->file.run,
vbo >> sbi->cluster_bits);
if (rw_lock) {
up_write(rw_lock);
ni_unlock(mft_ni);
}
if (err)
goto out;
if (rw_lock)
down_read(rw_lock);
err = ntfs_read_bh(sbi, run, vbo, &rec->rhdr, bpr, &mi->nb);
if (rw_lock)
up_read(rw_lock);
if (err == -E_NTFS_FIXUP) {
mi->dirty = true;
goto ok;
}
if (err)
goto out;
ok:
/* check field 'total' only here */
if (le32_to_cpu(rec->total) != bpr) {
err = -EINVAL;
goto out;
}
return 0;
out:
return err;
}
struct ATTRIB *mi_enum_attr(struct mft_inode *mi, struct ATTRIB *attr)
{
const struct MFT_REC *rec = mi->mrec;
u32 used = le32_to_cpu(rec->used);
u32 t32, off, asize;
u16 t16;
if (!attr) {
u32 total = le32_to_cpu(rec->total);
off = le16_to_cpu(rec->attr_off);
if (used > total)
return NULL;
if (off >= used || off < MFTRECORD_FIXUP_OFFSET_1 ||
!IsDwordAligned(off)) {
return NULL;
}
/* Skip non-resident records */
if (!is_rec_inuse(rec))
return NULL;
attr = Add2Ptr(rec, off);
} else {
/* Check if input attr inside record */
off = PtrOffset(rec, attr);
if (off >= used)
return NULL;
asize = le32_to_cpu(attr->size);
if (asize < SIZEOF_RESIDENT) {
/* Impossible 'cause we should not return such attribute */
return NULL;
}
attr = Add2Ptr(attr, asize);
off += asize;
}
asize = le32_to_cpu(attr->size);
/* Can we use the first field (attr->type) */
if (off + 8 > used) {
static_assert(QuadAlign(sizeof(enum ATTR_TYPE)) == 8);
return NULL;
}
if (attr->type == ATTR_END) {
/* end of enumeration */
return NULL;
}
/* 0x100 is last known attribute for now*/
t32 = le32_to_cpu(attr->type);
if ((t32 & 0xf) || (t32 > 0x100))
return NULL;
/* Check boundary */
if (off + asize > used)
return NULL;
/* Check size of attribute */
if (!attr->non_res) {
if (asize < SIZEOF_RESIDENT)
return NULL;
t16 = le16_to_cpu(attr->res.data_off);
if (t16 > asize)
return NULL;
t32 = le32_to_cpu(attr->res.data_size);
if (t16 + t32 > asize)
return NULL;
return attr;
}
/* Check some nonresident fields */
if (attr->name_len &&
le16_to_cpu(attr->name_off) + sizeof(short) * attr->name_len >
le16_to_cpu(attr->nres.run_off)) {
return NULL;
}
if (attr->nres.svcn || !is_attr_ext(attr)) {
if (asize + 8 < SIZEOF_NONRESIDENT)
return NULL;
if (attr->nres.c_unit)
return NULL;
} else if (asize + 8 < SIZEOF_NONRESIDENT_EX)
return NULL;
return attr;
}
/*
* mi_find_attr
*
* finds the attribute by type and name and id
*/
struct ATTRIB *mi_find_attr(struct mft_inode *mi, struct ATTRIB *attr,
enum ATTR_TYPE type, const __le16 *name,
size_t name_len, const __le16 *id)
{
u32 type_in = le32_to_cpu(type);
u32 atype;
next_attr:
attr = mi_enum_attr(mi, attr);
if (!attr)
return NULL;
atype = le32_to_cpu(attr->type);
if (atype > type_in)
return NULL;
if (atype < type_in)
goto next_attr;
if (attr->name_len != name_len)
goto next_attr;
if (name_len && memcmp(attr_name(attr), name, name_len * sizeof(short)))
goto next_attr;
if (id && *id != attr->id)
goto next_attr;
return attr;
}
int mi_write(struct mft_inode *mi, int wait)
{
struct MFT_REC *rec;
int err;
struct ntfs_sb_info *sbi;
if (!mi->dirty)
return 0;
sbi = mi->sbi;
rec = mi->mrec;
err = ntfs_write_bh(sbi, &rec->rhdr, &mi->nb, wait);
if (err)
return err;
if (mi->rno < sbi->mft.recs_mirr)
sbi->flags |= NTFS_FLAGS_MFTMIRR;
mi->dirty = false;
return 0;
}
int mi_format_new(struct mft_inode *mi, struct ntfs_sb_info *sbi, CLST rno,
__le16 flags, bool is_mft)
{
int err;
u16 seq = 1;
struct MFT_REC *rec;
u64 vbo = (u64)rno << sbi->record_bits;
err = mi_init(mi, sbi, rno);
if (err)
return err;
rec = mi->mrec;
if (rno == MFT_REC_MFT) {
;
} else if (rno < MFT_REC_FREE) {
seq = rno;
} else if (rno >= sbi->mft.used) {
;
} else if (mi_read(mi, is_mft)) {
;
} else if (rec->rhdr.sign == NTFS_FILE_SIGNATURE) {
/* Record is reused. Update its sequence number */
seq = le16_to_cpu(rec->seq) + 1;
if (!seq)
seq = 1;
}
memcpy(rec, sbi->new_rec, sbi->record_size);
rec->seq = cpu_to_le16(seq);
rec->flags = RECORD_FLAG_IN_USE | flags;
mi->dirty = true;
if (!mi->nb.nbufs) {
struct ntfs_inode *ni = sbi->mft.ni;
bool lock = false;
if (is_mounted(sbi) && !is_mft) {
down_read(&ni->file.run_lock);
lock = true;
}
err = ntfs_get_bh(sbi, &ni->file.run, vbo, sbi->record_size,
&mi->nb);
if (lock)
up_read(&ni->file.run_lock);
}
return err;
}
/*
* mi_mark_free
*
* marks record as unused and marks it as free in bitmap
*/
void mi_mark_free(struct mft_inode *mi)
{
CLST rno = mi->rno;
struct ntfs_sb_info *sbi = mi->sbi;
if (rno >= MFT_REC_RESERVED && rno < MFT_REC_FREE) {
ntfs_clear_mft_tail(sbi, rno, rno + 1);
mi->dirty = false;
return;
}
if (mi->mrec) {
clear_rec_inuse(mi->mrec);
mi->dirty = true;
mi_write(mi, 0);
}
ntfs_mark_rec_free(sbi, rno);
}
/*
* mi_insert_attr
*
* reserves space for new attribute
* returns not full constructed attribute or NULL if not possible to create
*/
struct ATTRIB *mi_insert_attr(struct mft_inode *mi, enum ATTR_TYPE type,
const __le16 *name, u8 name_len, u32 asize,
u16 name_off)
{
size_t tail;
struct ATTRIB *attr;
__le16 id;
struct MFT_REC *rec = mi->mrec;
struct ntfs_sb_info *sbi = mi->sbi;
u32 used = le32_to_cpu(rec->used);
const u16 *upcase = sbi->upcase;
int diff;
/* Can we insert mi attribute? */
if (used + asize > mi->sbi->record_size)
return NULL;
/*
* Scan through the list of attributes to find the point
* at which we should insert it.
*/
attr = NULL;
while ((attr = mi_enum_attr(mi, attr))) {
diff = compare_attr(attr, type, name, name_len, upcase);
if (diff > 0)
break;
if (diff < 0)
continue;
if (!is_attr_indexed(attr))
return NULL;
break;
}
if (!attr) {
tail = 8; /* not used, just to suppress warning */
attr = Add2Ptr(rec, used - 8);
} else {
tail = used - PtrOffset(rec, attr);
}
id = mi_new_attt_id(mi);
memmove(Add2Ptr(attr, asize), attr, tail);
memset(attr, 0, asize);
attr->type = type;
attr->size = cpu_to_le32(asize);
attr->name_len = name_len;
attr->name_off = cpu_to_le16(name_off);
attr->id = id;
memmove(Add2Ptr(attr, name_off), name, name_len * sizeof(short));
rec->used = cpu_to_le32(used + asize);
mi->dirty = true;
return attr;
}
/*
* mi_remove_attr
*
* removes the attribute from record
* NOTE: The source attr will point to next attribute
*/
bool mi_remove_attr(struct mft_inode *mi, struct ATTRIB *attr)
{
struct MFT_REC *rec = mi->mrec;
u32 aoff = PtrOffset(rec, attr);
u32 used = le32_to_cpu(rec->used);
u32 asize = le32_to_cpu(attr->size);
if (aoff + asize > used)
return false;
used -= asize;
memmove(attr, Add2Ptr(attr, asize), used - aoff);
rec->used = cpu_to_le32(used);
mi->dirty = true;
return true;
}
/* bytes = "new attribute size" - "old attribute size" */
bool mi_resize_attr(struct mft_inode *mi, struct ATTRIB *attr, int bytes)
{
struct MFT_REC *rec = mi->mrec;
u32 aoff = PtrOffset(rec, attr);
u32 total, used = le32_to_cpu(rec->used);
u32 nsize, asize = le32_to_cpu(attr->size);
u32 rsize = le32_to_cpu(attr->res.data_size);
int tail = (int)(used - aoff - asize);
int dsize;
char *next;
if (tail < 0 || aoff >= used)
return false;
if (!bytes)
return true;
total = le32_to_cpu(rec->total);
next = Add2Ptr(attr, asize);
if (bytes > 0) {
dsize = QuadAlign(bytes);
if (used + dsize > total)
return false;
nsize = asize + dsize;
// move tail
memmove(next + dsize, next, tail);
memset(next, 0, dsize);
used += dsize;
rsize += dsize;
} else {
dsize = QuadAlign(-bytes);
if (dsize > asize)
return false;
nsize = asize - dsize;
memmove(next - dsize, next, tail);
used -= dsize;
rsize -= dsize;
}
rec->used = cpu_to_le32(used);
attr->size = cpu_to_le32(nsize);
if (!attr->non_res)
attr->res.data_size = cpu_to_le32(rsize);
mi->dirty = true;
return true;
}
int mi_pack_runs(struct mft_inode *mi, struct ATTRIB *attr,
struct runs_tree *run, CLST len)
{
int err = 0;
struct ntfs_sb_info *sbi = mi->sbi;
u32 new_run_size;
CLST plen;
struct MFT_REC *rec = mi->mrec;
CLST svcn = le64_to_cpu(attr->nres.svcn);
u32 used = le32_to_cpu(rec->used);
u32 aoff = PtrOffset(rec, attr);
u32 asize = le32_to_cpu(attr->size);
char *next = Add2Ptr(attr, asize);
u16 run_off = le16_to_cpu(attr->nres.run_off);
u32 run_size = asize - run_off;
u32 tail = used - aoff - asize;
u32 dsize = sbi->record_size - used;
/* Make a maximum gap in current record */
memmove(next + dsize, next, tail);
/* Pack as much as possible */
err = run_pack(run, svcn, len, Add2Ptr(attr, run_off), run_size + dsize,
&plen);
if (err < 0) {
memmove(next, next + dsize, tail);
return err;
}
new_run_size = QuadAlign(err);
memmove(next + new_run_size - run_size, next + dsize, tail);
attr->size = cpu_to_le32(asize + new_run_size - run_size);
attr->nres.evcn = cpu_to_le64(svcn + plen - 1);
rec->used = cpu_to_le32(used + new_run_size - run_size);
mi->dirty = true;
return 0;
}

1111
fs/ntfs3/run.c Normal file
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File diff suppressed because it is too large Load diff