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super.c
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*
* terminology
*
* cluster - allocation unit - 512,1K,2K,4K,...,2M
* vcn - virtual cluster number - Offset inside the file in clusters.
* vbo - virtual byte offset - Offset inside the file in bytes.
* lcn - logical cluster number - 0 based cluster in clusters heap.
* lbo - logical byte offset - Absolute position inside volume.
* run - maps VCN to LCN - Stored in attributes in packed form.
* attr - attribute segment - std/name/data etc records inside MFT.
* mi - MFT inode - One MFT record(usually 1024 bytes or 4K), consists of attributes.
* ni - NTFS inode - Extends linux inode. consists of one or more mft inodes.
* index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size.
*
* WSL - Windows Subsystem for Linux
* https://docs.microsoft.com/en-us/windows/wsl/file-permissions
* It stores uid/gid/mode/dev in xattr
*
* ntfs allows up to 2^64 clusters per volume.
* It means you should use 64 bits lcn to operate with ntfs.
* Implementation of ntfs.sys uses only 32 bits lcn.
* Default ntfs3 uses 32 bits lcn too.
* ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn.
*
*
* ntfs limits, cluster size is 4K (2^12)
* -----------------------------------------------------------------------------
* | Volume size | Clusters | ntfs.sys | ntfs3 | ntfs3_64 | mkntfs | chkdsk |
* -----------------------------------------------------------------------------
* | < 16T, 2^44 | < 2^32 | yes | yes | yes | yes | yes |
* | > 16T, 2^44 | > 2^32 | no | no | yes | yes | yes |
* ----------------------------------------------------------|------------------
*
* To mount large volumes as ntfs one should use large cluster size (up to 2M)
* The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P
*
* ntfs limits, cluster size is 2M (2^21)
* -----------------------------------------------------------------------------
* | < 8P, 2^53 | < 2^32 | yes | yes | yes | yes | yes |
* | > 8P, 2^53 | > 2^32 | no | no | yes | yes | yes |
* ----------------------------------------------------------|------------------
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/log2.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/statfs.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
#ifdef CONFIG_NTFS3_LZX_XPRESS
#include "lib/lib.h"
#endif
#ifdef CONFIG_PRINTK
/*
* ntfs_printk - Trace warnings/notices/errors.
*
* Thanks Joe Perches <joe@perches.com> for implementation
*/
void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
int level;
struct ntfs_sb_info *sbi = sb->s_fs_info;
/* Should we use different ratelimits for warnings/notices/errors? */
if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
return;
va_start(args, fmt);
level = printk_get_level(fmt);
vaf.fmt = printk_skip_level(fmt);
vaf.va = &args;
printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);
va_end(args);
}
static char s_name_buf[512];
static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'.
/*
* ntfs_inode_printk
*
* Print warnings/notices/errors about inode using name or inode number.
*/
void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
{
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
char *name;
va_list args;
struct va_format vaf;
int level;
if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
return;
/* Use static allocated buffer, if possible. */
name = atomic_dec_and_test(&s_name_buf_cnt) ?
s_name_buf :
kmalloc(sizeof(s_name_buf), GFP_NOFS);
if (name) {
struct dentry *de = d_find_alias(inode);
const u32 name_len = ARRAY_SIZE(s_name_buf) - 1;
if (de) {
spin_lock(&de->d_lock);
snprintf(name, name_len, " \"%s\"", de->d_name.name);
spin_unlock(&de->d_lock);
name[name_len] = 0; /* To be sure. */
} else {
name[0] = 0;
}
dput(de); /* Cocci warns if placed in branch "if (de)" */
}
va_start(args, fmt);
level = printk_get_level(fmt);
vaf.fmt = printk_skip_level(fmt);
vaf.va = &args;
printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level,
sb->s_id, inode->i_ino, name ? name : "", &vaf);
va_end(args);
atomic_inc(&s_name_buf_cnt);
if (name != s_name_buf)
kfree(name);
}
#endif
/*
* Shared memory struct.
*
* On-disk ntfs's upcase table is created by ntfs formatter.
* 'upcase' table is 128K bytes of memory.
* We should read it into memory when mounting.
* Several ntfs volumes likely use the same 'upcase' table.
* It is good idea to share in-memory 'upcase' table between different volumes.
* Unfortunately winxp/vista/win7 use different upcase tables.
*/
static DEFINE_SPINLOCK(s_shared_lock);
static struct {
void *ptr;
u32 len;
int cnt;
} s_shared[8];
/*
* ntfs_set_shared
*
* Return:
* * @ptr - If pointer was saved in shared memory.
* * NULL - If pointer was not shared.
*/
void *ntfs_set_shared(void *ptr, u32 bytes)
{
void *ret = NULL;
int i, j = -1;
spin_lock(&s_shared_lock);
for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
if (!s_shared[i].cnt) {
j = i;
} else if (bytes == s_shared[i].len &&
!memcmp(s_shared[i].ptr, ptr, bytes)) {
s_shared[i].cnt += 1;
ret = s_shared[i].ptr;
break;
}
}
if (!ret && j != -1) {
s_shared[j].ptr = ptr;
s_shared[j].len = bytes;
s_shared[j].cnt = 1;
ret = ptr;
}
spin_unlock(&s_shared_lock);
return ret;
}
/*
* ntfs_put_shared
*
* Return:
* * @ptr - If pointer is not shared anymore.
* * NULL - If pointer is still shared.
*/
void *ntfs_put_shared(void *ptr)
{
void *ret = ptr;
int i;
spin_lock(&s_shared_lock);
for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
if (--s_shared[i].cnt)
ret = NULL;
break;
}
}
spin_unlock(&s_shared_lock);
return ret;
}
static inline void put_mount_options(struct ntfs_mount_options *options)
{
kfree(options->nls_name);
unload_nls(options->nls);
kfree(options);
}
enum Opt {
Opt_uid,
Opt_gid,
Opt_umask,
Opt_dmask,
Opt_fmask,
Opt_immutable,
Opt_discard,
Opt_force,
Opt_sparse,
Opt_nohidden,
Opt_hide_dot_files,
Opt_windows_names,
Opt_showmeta,
Opt_acl,
Opt_iocharset,
Opt_prealloc,
Opt_nocase,
Opt_err,
};
// clang-format off
static const struct fs_parameter_spec ntfs_fs_parameters[] = {
fsparam_u32("uid", Opt_uid),
fsparam_u32("gid", Opt_gid),
fsparam_u32oct("umask", Opt_umask),
fsparam_u32oct("dmask", Opt_dmask),
fsparam_u32oct("fmask", Opt_fmask),
fsparam_flag_no("sys_immutable", Opt_immutable),
fsparam_flag_no("discard", Opt_discard),
fsparam_flag_no("force", Opt_force),
fsparam_flag_no("sparse", Opt_sparse),
fsparam_flag_no("hidden", Opt_nohidden),
fsparam_flag_no("hide_dot_files", Opt_hide_dot_files),
fsparam_flag_no("windows_names", Opt_windows_names),
fsparam_flag_no("showmeta", Opt_showmeta),
fsparam_flag_no("acl", Opt_acl),
fsparam_string("iocharset", Opt_iocharset),
fsparam_flag_no("prealloc", Opt_prealloc),
fsparam_flag_no("nocase", Opt_nocase),
{}
};
// clang-format on
/*
* Load nls table or if @nls is utf8 then return NULL.
*
* It is good idea to use here "const char *nls".
* But load_nls accepts "char*".
*/
static struct nls_table *ntfs_load_nls(char *nls)
{
struct nls_table *ret;
if (!nls)
nls = CONFIG_NLS_DEFAULT;
if (strcmp(nls, "utf8") == 0)
return NULL;
if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0)
return load_nls_default();
ret = load_nls(nls);
if (ret)
return ret;
return ERR_PTR(-EINVAL);
}
static int ntfs_fs_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct ntfs_mount_options *opts = fc->fs_private;
struct fs_parse_result result;
int opt;
opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_uid:
opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
if (!uid_valid(opts->fs_uid))
return invalf(fc, "ntfs3: Invalid value for uid.");
break;
case Opt_gid:
opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
if (!gid_valid(opts->fs_gid))
return invalf(fc, "ntfs3: Invalid value for gid.");
break;
case Opt_umask:
if (result.uint_32 & ~07777)
return invalf(fc, "ntfs3: Invalid value for umask.");
opts->fs_fmask_inv = ~result.uint_32;
opts->fs_dmask_inv = ~result.uint_32;
opts->fmask = 1;
opts->dmask = 1;
break;
case Opt_dmask:
if (result.uint_32 & ~07777)
return invalf(fc, "ntfs3: Invalid value for dmask.");
opts->fs_dmask_inv = ~result.uint_32;
opts->dmask = 1;
break;
case Opt_fmask:
if (result.uint_32 & ~07777)
return invalf(fc, "ntfs3: Invalid value for fmask.");
opts->fs_fmask_inv = ~result.uint_32;
opts->fmask = 1;
break;
case Opt_immutable:
opts->sys_immutable = result.negated ? 0 : 1;
break;
case Opt_discard:
opts->discard = result.negated ? 0 : 1;
break;
case Opt_force:
opts->force = result.negated ? 0 : 1;
break;
case Opt_sparse:
opts->sparse = result.negated ? 0 : 1;
break;
case Opt_nohidden:
opts->nohidden = result.negated ? 1 : 0;
break;
case Opt_hide_dot_files:
opts->hide_dot_files = result.negated ? 0 : 1;
break;
case Opt_windows_names:
opts->windows_names = result.negated ? 0 : 1;
break;
case Opt_showmeta:
opts->showmeta = result.negated ? 0 : 1;
break;
case Opt_acl:
if (!result.negated)
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#else
return invalf(
fc, "ntfs3: Support for ACL not compiled in!");
#endif
else
fc->sb_flags &= ~SB_POSIXACL;
break;
case Opt_iocharset:
kfree(opts->nls_name);
opts->nls_name = param->string;
param->string = NULL;
break;
case Opt_prealloc:
opts->prealloc = result.negated ? 0 : 1;
break;
case Opt_nocase:
opts->nocase = result.negated ? 1 : 0;
break;
default:
/* Should not be here unless we forget add case. */
return -EINVAL;
}
return 0;
}
static int ntfs_fs_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_mount_options *new_opts = fc->fs_private;
int ro_rw;
ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
errorf(fc,
"ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n");
return -EINVAL;
}
new_opts->nls = ntfs_load_nls(new_opts->nls_name);
if (IS_ERR(new_opts->nls)) {
new_opts->nls = NULL;
errorf(fc, "ntfs3: Cannot load iocharset %s",
new_opts->nls_name);
return -EINVAL;
}
if (new_opts->nls != sbi->options->nls)
return invalf(
fc,
"ntfs3: Cannot use different iocharset when remounting!");
sync_filesystem(sb);
if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) &&
!new_opts->force) {
errorf(fc,
"ntfs3: Volume is dirty and \"force\" flag is not set!");
return -EINVAL;
}
swap(sbi->options, fc->fs_private);
return 0;
}
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_info_root;
/*
* ntfs3_volinfo:
*
* The content of /proc/fs/ntfs3/<dev>/volinfo
*
* ntfs3.1
* cluster size
* number of clusters
* total number of mft records
* number of used mft records ~= number of files + folders
* real state of ntfs "dirty"/"clean"
* current state of ntfs "dirty"/"clean"
*/
static int ntfs3_volinfo(struct seq_file *m, void *o)
{
struct super_block *sb = m->private;
struct ntfs_sb_info *sbi = sb->s_fs_info;
seq_printf(m, "ntfs%d.%d\n%u\n%zu\n\%zu\n%zu\n%s\n%s\n",
sbi->volume.major_ver, sbi->volume.minor_ver,
sbi->cluster_size, sbi->used.bitmap.nbits,
sbi->mft.bitmap.nbits,
sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap),
sbi->volume.real_dirty ? "dirty" : "clean",
(sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean");
return 0;
}
static int ntfs3_volinfo_open(struct inode *inode, struct file *file)
{
return single_open(file, ntfs3_volinfo, pde_data(inode));
}
/* read /proc/fs/ntfs3/<dev>/label */
static int ntfs3_label_show(struct seq_file *m, void *o)
{
struct super_block *sb = m->private;
struct ntfs_sb_info *sbi = sb->s_fs_info;
seq_printf(m, "%s\n", sbi->volume.label);
return 0;
}
/* write /proc/fs/ntfs3/<dev>/label */
static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
int err;
struct super_block *sb = pde_data(file_inode(file));
ssize_t ret = count;
u8 *label;
if (sb_rdonly(sb))
return -EROFS;
label = kmalloc(count, GFP_NOFS);
if (!label)
return -ENOMEM;
if (copy_from_user(label, buffer, ret)) {
ret = -EFAULT;
goto out;
}
while (ret > 0 && label[ret - 1] == '\n')
ret -= 1;
err = ntfs_set_label(sb->s_fs_info, label, ret);
if (err < 0) {
ntfs_err(sb, "failed (%d) to write label", err);
ret = err;
goto out;
}
*ppos += count;
ret = count;
out:
kfree(label);
return ret;
}
static int ntfs3_label_open(struct inode *inode, struct file *file)
{
return single_open(file, ntfs3_label_show, pde_data(inode));
}
static const struct proc_ops ntfs3_volinfo_fops = {
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_open = ntfs3_volinfo_open,
};
static const struct proc_ops ntfs3_label_fops = {
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_open = ntfs3_label_open,
.proc_write = ntfs3_label_write,
};
#endif
static struct kmem_cache *ntfs_inode_cachep;
static struct inode *ntfs_alloc_inode(struct super_block *sb)
{
struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS);
if (!ni)
return NULL;
memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode));
mutex_init(&ni->ni_lock);
return &ni->vfs_inode;
}
static void ntfs_free_inode(struct inode *inode)
{
struct ntfs_inode *ni = ntfs_i(inode);
mutex_destroy(&ni->ni_lock);
kmem_cache_free(ntfs_inode_cachep, ni);
}
static void init_once(void *foo)
{
struct ntfs_inode *ni = foo;
inode_init_once(&ni->vfs_inode);
}
/*
* Noinline to reduce binary size.
*/
static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi)
{
wnd_close(&sbi->mft.bitmap);
wnd_close(&sbi->used.bitmap);
if (sbi->mft.ni) {
iput(&sbi->mft.ni->vfs_inode);
sbi->mft.ni = NULL;
}
if (sbi->security.ni) {
iput(&sbi->security.ni->vfs_inode);
sbi->security.ni = NULL;
}
if (sbi->reparse.ni) {
iput(&sbi->reparse.ni->vfs_inode);
sbi->reparse.ni = NULL;
}
if (sbi->objid.ni) {
iput(&sbi->objid.ni->vfs_inode);
sbi->objid.ni = NULL;
}
if (sbi->volume.ni) {
iput(&sbi->volume.ni->vfs_inode);
sbi->volume.ni = NULL;
}
ntfs_update_mftmirr(sbi, 0);
indx_clear(&sbi->security.index_sii);
indx_clear(&sbi->security.index_sdh);
indx_clear(&sbi->reparse.index_r);
indx_clear(&sbi->objid.index_o);
}
static void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
{
kfree(sbi->new_rec);
kvfree(ntfs_put_shared(sbi->upcase));
kfree(sbi->def_table);
kfree(sbi->compress.lznt);
#ifdef CONFIG_NTFS3_LZX_XPRESS
xpress_free_decompressor(sbi->compress.xpress);
lzx_free_decompressor(sbi->compress.lzx);
#endif
kfree(sbi);
}
static void ntfs_put_super(struct super_block *sb)
{
struct ntfs_sb_info *sbi = sb->s_fs_info;
#ifdef CONFIG_PROC_FS
// Remove /proc/fs/ntfs3/..
if (sbi->procdir) {
remove_proc_entry("label", sbi->procdir);
remove_proc_entry("volinfo", sbi->procdir);
remove_proc_entry(sb->s_id, proc_info_root);
sbi->procdir = NULL;
}
#endif
/* Mark rw ntfs as clear, if possible. */
ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
ntfs3_put_sbi(sbi);
}
static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct wnd_bitmap *wnd = &sbi->used.bitmap;
buf->f_type = sb->s_magic;
buf->f_bsize = sbi->cluster_size;
buf->f_blocks = wnd->nbits;
buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
buf->f_fsid.val[0] = sbi->volume.ser_num;
buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32);
buf->f_namelen = NTFS_NAME_LEN;
return 0;
}
static int ntfs_show_options(struct seq_file *m, struct dentry *root)
{
struct super_block *sb = root->d_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_mount_options *opts = sbi->options;
struct user_namespace *user_ns = seq_user_ns(m);
seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid));
seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid));
if (opts->dmask)
seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff);
if (opts->fmask)
seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff);
if (opts->sys_immutable)
seq_puts(m, ",sys_immutable");
if (opts->discard)
seq_puts(m, ",discard");
if (opts->force)
seq_puts(m, ",force");
if (opts->sparse)
seq_puts(m, ",sparse");
if (opts->nohidden)
seq_puts(m, ",nohidden");
if (opts->hide_dot_files)
seq_puts(m, ",hide_dot_files");
if (opts->windows_names)
seq_puts(m, ",windows_names");
if (opts->showmeta)
seq_puts(m, ",showmeta");
if (sb->s_flags & SB_POSIXACL)
seq_puts(m, ",acl");
if (opts->nls)
seq_printf(m, ",iocharset=%s", opts->nls->charset);
else
seq_puts(m, ",iocharset=utf8");
if (opts->prealloc)
seq_puts(m, ",prealloc");
if (opts->nocase)
seq_puts(m, ",nocase");
return 0;
}
/*
* ntfs_sync_fs - super_operations::sync_fs
*/
static int ntfs_sync_fs(struct super_block *sb, int wait)
{
int err = 0, err2;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni;
struct inode *inode;
ni = sbi->security.ni;
if (ni) {
inode = &ni->vfs_inode;
err2 = _ni_write_inode(inode, wait);
if (err2 && !err)
err = err2;
}
ni = sbi->objid.ni;
if (ni) {
inode = &ni->vfs_inode;
err2 = _ni_write_inode(inode, wait);
if (err2 && !err)
err = err2;
}
ni = sbi->reparse.ni;
if (ni) {
inode = &ni->vfs_inode;
err2 = _ni_write_inode(inode, wait);
if (err2 && !err)
err = err2;
}
if (!err)
ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
ntfs_update_mftmirr(sbi, wait);
return err;
}
static const struct super_operations ntfs_sops = {
.alloc_inode = ntfs_alloc_inode,
.free_inode = ntfs_free_inode,
.evict_inode = ntfs_evict_inode,
.put_super = ntfs_put_super,
.statfs = ntfs_statfs,
.show_options = ntfs_show_options,
.sync_fs = ntfs_sync_fs,
.write_inode = ntfs3_write_inode,
};
static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
u32 generation)
{
struct MFT_REF ref;
struct inode *inode;
ref.low = cpu_to_le32(ino);
#ifdef CONFIG_NTFS3_64BIT_CLUSTER
ref.high = cpu_to_le16(ino >> 32);
#else
ref.high = 0;
#endif
ref.seq = cpu_to_le16(generation);
inode = ntfs_iget5(sb, &ref, NULL);
if (!IS_ERR(inode) && is_bad_inode(inode)) {
iput(inode);
inode = ERR_PTR(-ESTALE);
}
return inode;
}
static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
ntfs_export_get_inode);
}
static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
ntfs_export_get_inode);
}
/* TODO: == ntfs_sync_inode */
static int ntfs_nfs_commit_metadata(struct inode *inode)
{
return _ni_write_inode(inode, 1);
}
static const struct export_operations ntfs_export_ops = {
.encode_fh = generic_encode_ino32_fh,
.fh_to_dentry = ntfs_fh_to_dentry,
.fh_to_parent = ntfs_fh_to_parent,
.get_parent = ntfs3_get_parent,
.commit_metadata = ntfs_nfs_commit_metadata,
};
/*
* format_size_gb - Return Gb,Mb to print with "%u.%02u Gb".
*/
static u32 format_size_gb(const u64 bytes, u32 *mb)
{
/* Do simple right 30 bit shift of 64 bit value. */
u64 kbytes = bytes >> 10;
u32 kbytes32 = kbytes;
*mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
if (*mb >= 100)
*mb = 99;
return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
}
static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
{
if (boot->sectors_per_clusters <= 0x80)
return boot->sectors_per_clusters;
if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */
return 1U << (-(s8)boot->sectors_per_clusters);
return -EINVAL;
}
/*
* ntfs_init_from_boot - Init internal info from on-disk boot sector.
*
* NTFS mount begins from boot - special formatted 512 bytes.
* There are two boots: the first and the last 512 bytes of volume.
* The content of boot is not changed during ntfs life.
*
* NOTE: ntfs.sys checks only first (primary) boot.
* chkdsk checks both boots.
*/
static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
u64 dev_size, struct NTFS_BOOT **boot2)
{
struct ntfs_sb_info *sbi = sb->s_fs_info;
int err;
u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
u64 sectors, clusters, mlcn, mlcn2, dev_size0;
struct NTFS_BOOT *boot;
struct buffer_head *bh;
struct MFT_REC *rec;
u16 fn, ao;
u8 cluster_bits;
u32 boot_off = 0;
const char *hint = "Primary boot";
/* Save original dev_size. Used with alternative boot. */
dev_size0 = dev_size;
sbi->volume.blocks = dev_size >> PAGE_SHIFT;
bh = ntfs_bread(sb, 0);
if (!bh)
return -EIO;
check_boot:
err = -EINVAL;
/* Corrupted image; do not read OOB */
if (bh->b_size - sizeof(*boot) < boot_off)
goto out;
boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);
if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) {
ntfs_err(sb, "%s signature is not NTFS.", hint);
goto out;
}
/* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
/*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
* goto out;
*/
boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) |
boot->bytes_per_sector[0];
if (boot_sector_size < SECTOR_SIZE ||
!is_power_of_2(boot_sector_size)) {
ntfs_err(sb, "%s: invalid bytes per sector %u.", hint,
boot_sector_size);
goto out;
}
/* cluster size: 512, 1K, 2K, 4K, ... 2M */
sct_per_clst = true_sectors_per_clst(boot);
if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) {
ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint,
sct_per_clst);
goto out;
}
sbi->cluster_size = boot_sector_size * sct_per_clst;
sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size);
sbi->cluster_mask = sbi->cluster_size - 1;
sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
mlcn = le64_to_cpu(boot->mft_clst);
mlcn2 = le64_to_cpu(boot->mft2_clst);
sectors = le64_to_cpu(boot->sectors_per_volume);
if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) {
ntfs_err(
sb,
"%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.",
hint, mlcn, mlcn2, sectors);
goto out;
}
if (boot->record_size >= 0) {
record_size = (u32)boot->record_size << cluster_bits;
} else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) {
record_size = 1u << (-boot->record_size);
} else {
ntfs_err(sb, "%s: invalid record size %d.", hint,
boot->record_size);
goto out;
}
sbi->record_size = record_size;
sbi->record_bits = blksize_bits(record_size);
sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes
/* Check MFT record size. */
if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) {
ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint,
record_size, boot->record_size);
goto out;
}
if (record_size > MAXIMUM_BYTES_PER_MFT) {
ntfs_err(sb, "Unsupported bytes per MFT record %u.",
record_size);
goto out;
}
if (boot->index_size >= 0) {
sbi->index_size = (u32)boot->index_size << cluster_bits;
} else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) {
sbi->index_size = 1u << (-boot->index_size);
} else {
ntfs_err(sb, "%s: invalid index size %d.", hint,
boot->index_size);
goto out;
}
/* Check index record size. */
if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) {
ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint,
sbi->index_size, boot->index_size);
goto out;
}
if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) {
ntfs_err(sb, "%s: unsupported bytes per index %u.", hint,
sbi->index_size);
goto out;
}
sbi->volume.size = sectors * boot_sector_size;
gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb);
/*
* - Volume formatted and mounted with the same sector size.
* - Volume formatted 4K and mounted as 512.
* - Volume formatted 512 and mounted as 4K.
*/
if (boot_sector_size != sector_size) {
ntfs_warn(
sb,
"Different NTFS sector size (%u) and media sector size (%u).",
boot_sector_size, sector_size);
dev_size += sector_size - 1;
}
sbi->mft.lbo = mlcn << cluster_bits;