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android-kvm / linux / 36975616ea5837955ce9bbe84095680c940fe025 / . / fs / ntfs3 / super.c
blob: 9153dffde950c2a396291bea88e3e6d31169f568 [file] [log] [blame]
// 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;
sbi->mft.lbo2 = mlcn2 << cluster_bits;
/* Compare boot's cluster and sector. */
if (sbi->cluster_size < boot_sector_size) {
ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint,
sbi->cluster_size);
goto out;
}
/* Compare boot's cluster and media sector. */
if (sbi->cluster_size < sector_size) {
/* No way to use ntfs_get_block in this case. */
ntfs_err(
sb,
"Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).",
sbi->cluster_size, sector_size);
goto out;
}
sbi->max_bytes_per_attr =
record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) -
ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) -
ALIGN(sizeof(enum ATTR_TYPE), 8);
sbi->volume.ser_num = le64_to_cpu(boot->serial_num);
/* Warning if RAW volume. */
if (dev_size < sbi->volume.size + boot_sector_size) {
u32 mb0, gb0;
gb0 = format_size_gb(dev_size, &mb0);
ntfs_warn(
sb,
"RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.",
gb, mb, gb0, mb0);
sb->s_flags |= SB_RDONLY;
}
clusters = sbi->volume.size >> cluster_bits;
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
/* 32 bits per cluster. */
if (clusters >> 32) {
ntfs_notice(
sb,
"NTFS %u.%02u Gb is too big to use 32 bits per cluster.",
gb, mb);
goto out;
}
#elif BITS_PER_LONG < 64
#error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
#endif
sbi->used.bitmap.nbits = clusters;
rec = kzalloc(record_size, GFP_NOFS);
if (!rec) {
err = -ENOMEM;
goto out;
}
sbi->new_rec = rec;
rec->rhdr.sign = NTFS_FILE_SIGNATURE;
rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET);
fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
rec->rhdr.fix_num = cpu_to_le16(fn);
ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8);
rec->attr_off = cpu_to_le16(ao);
rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8));
rec->total = cpu_to_le32(sbi->record_size);
((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;
sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE));
sbi->block_mask = sb->s_blocksize - 1;
sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;
/* Maximum size for normal files. */
sbi->maxbytes = (clusters << cluster_bits) - 1;
#ifdef CONFIG_NTFS3_64BIT_CLUSTER
if (clusters >= (1ull << (64 - cluster_bits)))
sbi->maxbytes = -1;
sbi->maxbytes_sparse = -1;
sb->s_maxbytes = MAX_LFS_FILESIZE;
#else
/* Maximum size for sparse file. */
sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1;
sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits;
#endif
/*
* Compute the MFT zone at two steps.
* It would be nice if we are able to allocate 1/8 of
* total clusters for MFT but not more then 512 MB.
*/
sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3);
err = 0;
if (bh->b_blocknr && !sb_rdonly(sb)) {
/*
* Alternative boot is ok but primary is not ok.
* Do not update primary boot here 'cause it may be faked boot.
* Let ntfs to be mounted and update boot later.
*/
*boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN);
}
out:
if (err == -EINVAL && !bh->b_blocknr && dev_size0 > PAGE_SHIFT) {
u32 block_size = min_t(u32, sector_size, PAGE_SIZE);
u64 lbo = dev_size0 - sizeof(*boot);
/*
* Try alternative boot (last sector)
*/
brelse(bh);
sb_set_blocksize(sb, block_size);
bh = ntfs_bread(sb, lbo >> blksize_bits(block_size));
if (!bh)
return -EINVAL;
boot_off = lbo & (block_size - 1);
hint = "Alternative boot";
dev_size = dev_size0; /* restore original size. */
goto check_boot;
}
brelse(bh);
return err;
}
/*
* ntfs_fill_super - Try to mount.
*/
static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
int err;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct block_device *bdev = sb->s_bdev;
struct ntfs_mount_options *options;
struct inode *inode;
struct ntfs_inode *ni;
size_t i, tt, bad_len, bad_frags;
CLST vcn, lcn, len;
struct ATTRIB *attr;
const struct VOLUME_INFO *info;
u32 idx, done, bytes;
struct ATTR_DEF_ENTRY *t;
u16 *shared;
struct MFT_REF ref;
bool ro = sb_rdonly(sb);
struct NTFS_BOOT *boot2 = NULL;
ref.high = 0;
sbi->sb = sb;
sbi->options = options = fc->fs_private;
fc->fs_private = NULL;
sb->s_flags |= SB_NODIRATIME;
sb->s_magic = 0x7366746e; // "ntfs"
sb->s_op = &ntfs_sops;
sb->s_export_op = &ntfs_export_ops;
sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
sb->s_xattr = ntfs_xattr_handlers;
sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL;
options->nls = ntfs_load_nls(options->nls_name);
if (IS_ERR(options->nls)) {
options->nls = NULL;
errorf(fc, "Cannot load nls %s", options->nls_name);
err = -EINVAL;
goto out;
}
if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
sbi->discard_granularity = bdev_discard_granularity(bdev);
sbi->discard_granularity_mask_inv =
~(u64)(sbi->discard_granularity - 1);
}
/* Parse boot. */
err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev),
bdev_nr_bytes(bdev), &boot2);
if (err)
goto out;
/*
* Load $Volume. This should be done before $LogFile
* 'cause 'sbi->volume.ni' is used 'ntfs_set_state'.
*/
ref.low = cpu_to_le32(MFT_REC_VOL);
ref.seq = cpu_to_le16(MFT_REC_VOL);
inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $Volume (%d).", err);
goto out;
}
ni = ntfs_i(inode);
/* Load and save label (not necessary). */
attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);
if (!attr) {
/* It is ok if no ATTR_LABEL */
} else if (!attr->non_res && !is_attr_ext(attr)) {
/* $AttrDef allows labels to be up to 128 symbols. */
err = utf16s_to_utf8s(resident_data(attr),
le32_to_cpu(attr->res.data_size) >> 1,
UTF16_LITTLE_ENDIAN, sbi->volume.label,
sizeof(sbi->volume.label));
if (err < 0)
sbi->volume.label[0] = 0;
} else {
/* Should we break mounting here? */
//err = -EINVAL;
//goto put_inode_out;
}
attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
if (!attr || is_attr_ext(attr) ||
!(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) {
ntfs_err(sb, "$Volume is corrupted.");
err = -EINVAL;
goto put_inode_out;
}
sbi->volume.major_ver = info->major_ver;
sbi->volume.minor_ver = info->minor_ver;
sbi->volume.flags = info->flags;
sbi->volume.ni = ni;
if (info->flags & VOLUME_FLAG_DIRTY) {
sbi->volume.real_dirty = true;
ntfs_info(sb, "It is recommened to use chkdsk.");
}
/* Load $MFTMirr to estimate recs_mirr. */
ref.low = cpu_to_le32(MFT_REC_MIRR);
ref.seq = cpu_to_le16(MFT_REC_MIRR);
inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $MFTMirr (%d).", err);
goto out;
}
sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >>
sbi->record_bits;
iput(inode);
/* Load LogFile to replay. */
ref.low = cpu_to_le32(MFT_REC_LOG);
ref.seq = cpu_to_le16(MFT_REC_LOG);
inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load \x24LogFile (%d).", err);
goto out;
}
ni = ntfs_i(inode);
err = ntfs_loadlog_and_replay(ni, sbi);
if (err)
goto put_inode_out;
iput(inode);
if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) {
ntfs_warn(sb, "failed to replay log file. Can't mount rw!");
err = -EINVAL;
goto out;
}
if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) {
ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!");
err = -EINVAL;
goto out;
}
/* Load $MFT. */
ref.low = cpu_to_le32(MFT_REC_MFT);
ref.seq = cpu_to_le16(1);
inode = ntfs_iget5(sb, &ref, &NAME_MFT);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $MFT (%d).", err);
goto out;
}
ni = ntfs_i(inode);
sbi->mft.used = ni->i_valid >> sbi->record_bits;
tt = inode->i_size >> sbi->record_bits;
sbi->mft.next_free = MFT_REC_USER;
err = wnd_init(&sbi->mft.bitmap, sb, tt);
if (err)
goto put_inode_out;
err = ni_load_all_mi(ni);
if (err) {
ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err);
goto put_inode_out;
}
sbi->mft.ni = ni;
/* Load $Bitmap. */
ref.low = cpu_to_le32(MFT_REC_BITMAP);
ref.seq = cpu_to_le16(MFT_REC_BITMAP);
inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $Bitmap (%d).", err);
goto out;
}
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
if (inode->i_size >> 32) {
err = -EINVAL;
goto put_inode_out;
}
#endif
/* Check bitmap boundary. */
tt = sbi->used.bitmap.nbits;
if (inode->i_size < bitmap_size(tt)) {
ntfs_err(sb, "$Bitmap is corrupted.");
err = -EINVAL;
goto put_inode_out;
}
err = wnd_init(&sbi->used.bitmap, sb, tt);
if (err) {
ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err);
goto put_inode_out;
}
iput(inode);
/* Compute the MFT zone. */
err = ntfs_refresh_zone(sbi);
if (err) {
ntfs_err(sb, "Failed to initialize MFT zone (%d).", err);
goto out;
}
/* Load $BadClus. */
ref.low = cpu_to_le32(MFT_REC_BADCLUST);
ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $BadClus (%d).", err);
goto out;
}
ni = ntfs_i(inode);
bad_len = bad_frags = 0;
for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
if (lcn == SPARSE_LCN)
continue;
bad_len += len;
bad_frags += 1;
if (ro)
continue;
if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) {
/* Bad blocks marked as free in bitmap. */
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
}
}
if (bad_len) {
/*
* Notice about bad blocks.
* In normal cases these blocks are marked as used in bitmap.
* And we never allocate space in it.
*/
ntfs_notice(sb,
"Volume contains %zu bad blocks in %zu fragments.",
bad_len, bad_frags);
}
iput(inode);
/* Load $AttrDef. */
ref.low = cpu_to_le32(MFT_REC_ATTR);
ref.seq = cpu_to_le16(MFT_REC_ATTR);
inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $AttrDef (%d)", err);
goto out;
}
/*
* Typical $AttrDef contains up to 20 entries.
* Check for extremely large/small size.
*/
if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) ||
inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) {
ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).",
inode->i_size);
err = -EINVAL;
goto put_inode_out;
}
bytes = inode->i_size;
sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL);
if (!t) {
err = -ENOMEM;
goto put_inode_out;
}
for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
unsigned long tail = bytes - done;
struct page *page = ntfs_map_page(inode->i_mapping, idx);
if (IS_ERR(page)) {
err = PTR_ERR(page);
ntfs_err(sb, "Failed to read $AttrDef (%d).", err);
goto put_inode_out;
}
memcpy(Add2Ptr(t, done), page_address(page),
min(PAGE_SIZE, tail));
ntfs_unmap_page(page);
if (!idx && ATTR_STD != t->type) {
ntfs_err(sb, "$AttrDef is corrupted.");
err = -EINVAL;
goto put_inode_out;
}
}
t += 1;
sbi->def_entries = 1;
done = sizeof(struct ATTR_DEF_ENTRY);
sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
sbi->ea_max_size = 0x10000; /* default formatter value */
while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
u32 t32 = le32_to_cpu(t->type);
u64 sz = le64_to_cpu(t->max_sz);
if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
break;
if (t->type == ATTR_REPARSE)
sbi->reparse.max_size = sz;
else if (t->type == ATTR_EA)
sbi->ea_max_size = sz;
done += sizeof(struct ATTR_DEF_ENTRY);
t += 1;
sbi->def_entries += 1;
}
iput(inode);
/* Load $UpCase. */
ref.low = cpu_to_le32(MFT_REC_UPCASE);
ref.seq = cpu_to_le16(MFT_REC_UPCASE);
inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load $UpCase (%d).", err);
goto out;
}
if (inode->i_size != 0x10000 * sizeof(short)) {
err = -EINVAL;
ntfs_err(sb, "$UpCase is corrupted.");
goto put_inode_out;
}
for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
const __le16 *src;
u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT);
struct page *page = ntfs_map_page(inode->i_mapping, idx);
if (IS_ERR(page)) {
err = PTR_ERR(page);
ntfs_err(sb, "Failed to read $UpCase (%d).", err);
goto put_inode_out;
}
src = page_address(page);
#ifdef __BIG_ENDIAN
for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
*dst++ = le16_to_cpu(*src++);
#else
memcpy(dst, src, PAGE_SIZE);
#endif
ntfs_unmap_page(page);
}
shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short));
if (shared && sbi->upcase != shared) {
kvfree(sbi->upcase);
sbi->upcase = shared;
}
iput(inode);
if (is_ntfs3(sbi)) {
/* Load $Secure. */
err = ntfs_security_init(sbi);
if (err) {
ntfs_err(sb, "Failed to initialize $Secure (%d).", err);
goto out;
}
/* Load $Extend. */
err = ntfs_extend_init(sbi);
if (err) {
ntfs_warn(sb, "Failed to initialize $Extend.");
goto load_root;
}
/* Load $Extend/$Reparse. */
err = ntfs_reparse_init(sbi);
if (err) {
ntfs_warn(sb, "Failed to initialize $Extend/$Reparse.");
goto load_root;
}
/* Load $Extend/$ObjId. */
err = ntfs_objid_init(sbi);
if (err) {
ntfs_warn(sb, "Failed to initialize $Extend/$ObjId.");
goto load_root;
}
}
load_root:
/* Load root. */
ref.low = cpu_to_le32(MFT_REC_ROOT);
ref.seq = cpu_to_le16(MFT_REC_ROOT);
inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
ntfs_err(sb, "Failed to load root (%d).", err);
goto out;
}
/*
* Final check. Looks like this case should never occurs.
*/
if (!inode->i_op) {
err = -EINVAL;
ntfs_err(sb, "Failed to load root (%d).", err);
goto put_inode_out;
}
sb->s_root = d_make_root(inode);
if (!sb->s_root) {
err = -ENOMEM;
goto put_inode_out;
}
if (boot2) {
/*
* Alternative boot is ok but primary is not ok.
* Volume is recognized as NTFS. Update primary boot.
*/
struct buffer_head *bh0 = sb_getblk(sb, 0);
if (bh0) {
if (buffer_locked(bh0))
__wait_on_buffer(bh0);
lock_buffer(bh0);
memcpy(bh0->b_data, boot2, sizeof(*boot2));
set_buffer_uptodate(bh0);
mark_buffer_dirty(bh0);
unlock_buffer(bh0);
if (!sync_dirty_buffer(bh0))
ntfs_warn(sb, "primary boot is updated");
put_bh(bh0);
}
kfree(boot2);
}
#ifdef CONFIG_PROC_FS
/* Create /proc/fs/ntfs3/.. */
if (proc_info_root) {
struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root);
static_assert((S_IRUGO | S_IWUSR) == 0644);
if (e) {
proc_create_data("volinfo", S_IRUGO, e,
&ntfs3_volinfo_fops, sb);
proc_create_data("label", S_IRUGO | S_IWUSR, e,
&ntfs3_label_fops, sb);
sbi->procdir = e;
}
}
#endif
return 0;
put_inode_out:
iput(inode);
out:
ntfs3_put_sbi(sbi);
kfree(boot2);
ntfs3_put_sbi(sbi);
return err;
}
void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
{
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct block_device *bdev = sb->s_bdev;
sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
unsigned long cnt = 0;
unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
<< (PAGE_SHIFT - sb->s_blocksize_bits);
if (limit >= 0x2000)
limit -= 0x1000;
else if (limit < 32)
limit = 32;
else
limit >>= 1;
while (blocks--) {
clean_bdev_aliases(bdev, devblock++, 1);
if (cnt++ >= limit) {
sync_blockdev(bdev);
cnt = 0;
}
}
}
/*
* ntfs_discard - Issue a discard request (trim for SSD).
*/
int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
{
int err;
u64 lbo, bytes, start, end;
struct super_block *sb;
if (sbi->used.next_free_lcn == lcn + len)
sbi->used.next_free_lcn = lcn;
if (sbi->flags & NTFS_FLAGS_NODISCARD)
return -EOPNOTSUPP;
if (!sbi->options->discard)
return -EOPNOTSUPP;
lbo = (u64)lcn << sbi->cluster_bits;
bytes = (u64)len << sbi->cluster_bits;
/* Align up 'start' on discard_granularity. */
start = (lbo + sbi->discard_granularity - 1) &
sbi->discard_granularity_mask_inv;
/* Align down 'end' on discard_granularity. */
end = (lbo + bytes) & sbi->discard_granularity_mask_inv;
sb = sbi->sb;
if (start >= end)
return 0;
err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
GFP_NOFS);
if (err == -EOPNOTSUPP)
sbi->flags |= NTFS_FLAGS_NODISCARD;
return err;
}
static int ntfs_fs_get_tree(struct fs_context *fc)
{
return get_tree_bdev(fc, ntfs_fill_super);
}
/*
* ntfs_fs_free - Free fs_context.
*
* Note that this will be called after fill_super and reconfigure
* even when they pass. So they have to take pointers if they pass.
*/
static void ntfs_fs_free(struct fs_context *fc)
{
struct ntfs_mount_options *opts = fc->fs_private;
struct ntfs_sb_info *sbi = fc->s_fs_info;
if (sbi) {
ntfs3_put_sbi(sbi);
ntfs3_free_sbi(sbi);
}
if (opts)
put_mount_options(opts);
}
// clang-format off
static const struct fs_context_operations ntfs_context_ops = {
.parse_param = ntfs_fs_parse_param,
.get_tree = ntfs_fs_get_tree,
.reconfigure = ntfs_fs_reconfigure,
.free = ntfs_fs_free,
};
// clang-format on
/*
* ntfs_init_fs_context - Initialize sbi and opts
*
* This will called when mount/remount. We will first initialize
* options so that if remount we can use just that.
*/
static int ntfs_init_fs_context(struct fs_context *fc)
{
struct ntfs_mount_options *opts;
struct ntfs_sb_info *sbi;
opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS);
if (!opts)
return -ENOMEM;
/* Default options. */
opts->fs_uid = current_uid();
opts->fs_gid = current_gid();
opts->fs_fmask_inv = ~current_umask();
opts->fs_dmask_inv = ~current_umask();
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
goto ok;
sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS);
if (!sbi)
goto free_opts;
sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL);
if (!sbi->upcase)
goto free_sbi;
ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
mutex_init(&sbi->compress.mtx_lznt);
#ifdef CONFIG_NTFS3_LZX_XPRESS
mutex_init(&sbi->compress.mtx_xpress);
mutex_init(&sbi->compress.mtx_lzx);
#endif
fc->s_fs_info = sbi;
ok:
fc->fs_private = opts;
fc->ops = &ntfs_context_ops;
return 0;
free_sbi:
kfree(sbi);
free_opts:
kfree(opts);
return -ENOMEM;
}
static void ntfs3_kill_sb(struct super_block *sb)
{
struct ntfs_sb_info *sbi = sb->s_fs_info;
kill_block_super(sb);
if (sbi->options)
put_mount_options(sbi->options);
ntfs3_free_sbi(sbi);
}
// clang-format off
static struct file_system_type ntfs_fs_type = {
.owner = THIS_MODULE,
.name = "ntfs3",
.init_fs_context = ntfs_init_fs_context,
.parameters = ntfs_fs_parameters,
.kill_sb = ntfs3_kill_sb,
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
};
// clang-format on
static int __init init_ntfs_fs(void)
{
int err;
pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX);
if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
pr_notice(
"ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
pr_info("ntfs3: Read-only LZX/Xpress compression included\n");
#ifdef CONFIG_PROC_FS
/* Create "/proc/fs/ntfs3" */
proc_info_root = proc_mkdir("fs/ntfs3", NULL);
#endif
err = ntfs3_init_bitmap();
if (err)
return err;
ntfs_inode_cachep = kmem_cache_create(
"ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
init_once);
if (!ntfs_inode_cachep) {
err = -ENOMEM;
goto out1;
}
err = register_filesystem(&ntfs_fs_type);
if (err)
goto out;
return 0;
out:
kmem_cache_destroy(ntfs_inode_cachep);
out1:
ntfs3_exit_bitmap();
return err;
}
static void __exit exit_ntfs_fs(void)
{
rcu_barrier();
kmem_cache_destroy(ntfs_inode_cachep);
unregister_filesystem(&ntfs_fs_type);
ntfs3_exit_bitmap();
#ifdef CONFIG_PROC_FS
if (proc_info_root)
remove_proc_entry("fs/ntfs3", NULL);
#endif
}
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ntfs3 read/write filesystem");
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
#endif
#ifdef CONFIG_NTFS3_64BIT_CLUSTER
MODULE_INFO(
cluster,
"Warning: Activated 64 bits per cluster. Windows does not support this");
#endif
#ifdef CONFIG_NTFS3_LZX_XPRESS
MODULE_INFO(compression, "Read-only lzx/xpress compression included");
#endif
MODULE_AUTHOR("Konstantin Komarov");
MODULE_ALIAS_FS("ntfs3");
module_init(init_ntfs_fs);
module_exit(exit_ntfs_fs);