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-rw-r--r--fs/ntfs3/super.c1867
1 files changed, 1867 insertions, 0 deletions
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
new file mode 100644
index 0000000000..f763e3256c
--- /dev/null
+++ b/fs/ntfs3/super.c
@@ -0,0 +1,1867 @@
+// 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 = {
+ .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);