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android-kvm / linux / 83bb96fac39b0d895c2c939dbdabeaa19bc30add / . / fs / ntfs3 / inode.c
blob: 6c560245eef43389df2e62ee4e286dc0cd6a6161 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/mpage.h>
#include <linux/namei.h>
#include <linux/nls.h>
#include <linux/uio.h>
#include <linux/writeback.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
/*
* ntfs_read_mft - Read record and parses MFT.
*/
static struct inode *ntfs_read_mft(struct inode *inode,
const struct cpu_str *name,
const struct MFT_REF *ref)
{
int err = 0;
struct ntfs_inode *ni = ntfs_i(inode);
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
mode_t mode = 0;
struct ATTR_STD_INFO5 *std5 = NULL;
struct ATTR_LIST_ENTRY *le;
struct ATTRIB *attr;
bool is_match = false;
bool is_root = false;
bool is_dir;
unsigned long ino = inode->i_ino;
u32 rp_fa = 0, asize, t32;
u16 roff, rsize, names = 0;
const struct ATTR_FILE_NAME *fname = NULL;
const struct INDEX_ROOT *root;
struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
u64 t64;
struct MFT_REC *rec;
struct runs_tree *run;
inode->i_op = NULL;
/* Setup 'uid' and 'gid' */
inode->i_uid = sbi->options->fs_uid;
inode->i_gid = sbi->options->fs_gid;
err = mi_init(&ni->mi, sbi, ino);
if (err)
goto out;
if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
t64 = sbi->mft.lbo >> sbi->cluster_bits;
t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
sbi->mft.ni = ni;
init_rwsem(&ni->file.run_lock);
if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
err = -ENOMEM;
goto out;
}
}
err = mi_read(&ni->mi, ino == MFT_REC_MFT);
if (err)
goto out;
rec = ni->mi.mrec;
if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
;
} else if (ref->seq != rec->seq) {
err = -EINVAL;
ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
goto out;
} else if (!is_rec_inuse(rec)) {
err = -ESTALE;
ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
goto out;
}
if (le32_to_cpu(rec->total) != sbi->record_size) {
/* Bad inode? */
err = -EINVAL;
goto out;
}
if (!is_rec_base(rec)) {
err = -EINVAL;
goto out;
}
/* Record should contain $I30 root. */
is_dir = rec->flags & RECORD_FLAG_DIR;
/* MFT_REC_MFT is not a dir */
if (is_dir && ino == MFT_REC_MFT) {
err = -EINVAL;
goto out;
}
inode->i_generation = le16_to_cpu(rec->seq);
/* Enumerate all struct Attributes MFT. */
le = NULL;
attr = NULL;
/*
* To reduce tab pressure use goto instead of
* while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
*/
next_attr:
run = NULL;
err = -EINVAL;
attr = ni_enum_attr_ex(ni, attr, &le, NULL);
if (!attr)
goto end_enum;
if (le && le->vcn) {
/* This is non primary attribute segment. Ignore if not MFT. */
if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
goto next_attr;
run = &ni->file.run;
asize = le32_to_cpu(attr->size);
goto attr_unpack_run;
}
roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
asize = le32_to_cpu(attr->size);
/*
* Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
* There not critical to check this case again
*/
if (attr->name_len &&
sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
asize)
goto out;
if (attr->non_res) {
t64 = le64_to_cpu(attr->nres.alloc_size);
if (le64_to_cpu(attr->nres.data_size) > t64 ||
le64_to_cpu(attr->nres.valid_size) > t64)
goto out;
}
switch (attr->type) {
case ATTR_STD:
if (attr->non_res ||
asize < sizeof(struct ATTR_STD_INFO) + roff ||
rsize < sizeof(struct ATTR_STD_INFO))
goto out;
if (std5)
goto next_attr;
std5 = Add2Ptr(attr, roff);
#ifdef STATX_BTIME
nt2kernel(std5->cr_time, &ni->i_crtime);
#endif
nt2kernel(std5->a_time, &inode->i_atime);
nt2kernel(std5->c_time, &inode->i_ctime);
nt2kernel(std5->m_time, &inode->i_mtime);
ni->std_fa = std5->fa;
if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
rsize >= sizeof(struct ATTR_STD_INFO5))
ni->std_security_id = std5->security_id;
goto next_attr;
case ATTR_LIST:
if (attr->name_len || le || ino == MFT_REC_LOG)
goto out;
err = ntfs_load_attr_list(ni, attr);
if (err)
goto out;
le = NULL;
attr = NULL;
goto next_attr;
case ATTR_NAME:
if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
rsize < SIZEOF_ATTRIBUTE_FILENAME)
goto out;
fname = Add2Ptr(attr, roff);
if (fname->type == FILE_NAME_DOS)
goto next_attr;
names += 1;
if (name && name->len == fname->name_len &&
!ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
NULL, false))
is_match = true;
goto next_attr;
case ATTR_DATA:
if (is_dir) {
/* Ignore data attribute in dir record. */
goto next_attr;
}
if (ino == MFT_REC_BADCLUST && !attr->non_res)
goto next_attr;
if (attr->name_len &&
((ino != MFT_REC_BADCLUST || !attr->non_res ||
attr->name_len != ARRAY_SIZE(BAD_NAME) ||
memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
(ino != MFT_REC_SECURE || !attr->non_res ||
attr->name_len != ARRAY_SIZE(SDS_NAME) ||
memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
/* File contains stream attribute. Ignore it. */
goto next_attr;
}
if (is_attr_sparsed(attr))
ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
else
ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
if (is_attr_compressed(attr))
ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
else
ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
if (is_attr_encrypted(attr))
ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
else
ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
if (!attr->non_res) {
ni->i_valid = inode->i_size = rsize;
inode_set_bytes(inode, rsize);
}
mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
if (!attr->non_res) {
ni->ni_flags |= NI_FLAG_RESIDENT;
goto next_attr;
}
inode_set_bytes(inode, attr_ondisk_size(attr));
ni->i_valid = le64_to_cpu(attr->nres.valid_size);
inode->i_size = le64_to_cpu(attr->nres.data_size);
if (!attr->nres.alloc_size)
goto next_attr;
run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
&ni->file.run;
break;
case ATTR_ROOT:
if (attr->non_res)
goto out;
root = Add2Ptr(attr, roff);
if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
goto next_attr;
if (root->type != ATTR_NAME ||
root->rule != NTFS_COLLATION_TYPE_FILENAME)
goto out;
if (!is_dir)
goto next_attr;
is_root = true;
ni->ni_flags |= NI_FLAG_DIR;
err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
if (err)
goto out;
mode = sb->s_root ?
(S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
(S_IFDIR | 0777);
goto next_attr;
case ATTR_ALLOC:
if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
goto next_attr;
inode->i_size = le64_to_cpu(attr->nres.data_size);
ni->i_valid = le64_to_cpu(attr->nres.valid_size);
inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
run = &ni->dir.alloc_run;
break;
case ATTR_BITMAP:
if (ino == MFT_REC_MFT) {
if (!attr->non_res)
goto out;
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
/* 0x20000000 = 2^32 / 8 */
if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
goto out;
#endif
run = &sbi->mft.bitmap.run;
break;
} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
!memcmp(attr_name(attr), I30_NAME,
sizeof(I30_NAME)) &&
attr->non_res) {
run = &ni->dir.bitmap_run;
break;
}
goto next_attr;
case ATTR_REPARSE:
if (attr->name_len)
goto next_attr;
rp_fa = ni_parse_reparse(ni, attr, &rp);
switch (rp_fa) {
case REPARSE_LINK:
/*
* Normal symlink.
* Assume one unicode symbol == one utf8.
*/
inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
.PrintNameLength) /
sizeof(u16);
ni->i_valid = inode->i_size;
/* Clear directory bit. */
if (ni->ni_flags & NI_FLAG_DIR) {
indx_clear(&ni->dir);
memset(&ni->dir, 0, sizeof(ni->dir));
ni->ni_flags &= ~NI_FLAG_DIR;
} else {
run_close(&ni->file.run);
}
mode = S_IFLNK | 0777;
is_dir = false;
if (attr->non_res) {
run = &ni->file.run;
goto attr_unpack_run; // Double break.
}
break;
case REPARSE_COMPRESSED:
break;
case REPARSE_DEDUPLICATED:
break;
}
goto next_attr;
case ATTR_EA_INFO:
if (!attr->name_len &&
resident_data_ex(attr, sizeof(struct EA_INFO))) {
ni->ni_flags |= NI_FLAG_EA;
/*
* ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
*/
inode->i_mode = mode;
ntfs_get_wsl_perm(inode);
mode = inode->i_mode;
}
goto next_attr;
default:
goto next_attr;
}
attr_unpack_run:
roff = le16_to_cpu(attr->nres.run_off);
if (roff > asize) {
err = -EINVAL;
goto out;
}
t64 = le64_to_cpu(attr->nres.svcn);
err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
t64, Add2Ptr(attr, roff), asize - roff);
if (err < 0)
goto out;
err = 0;
goto next_attr;
end_enum:
if (!std5)
goto out;
if (!is_match && name) {
/* Reuse rec as buffer for ascii name. */
err = -ENOENT;
goto out;
}
if (std5->fa & FILE_ATTRIBUTE_READONLY)
mode &= ~0222;
if (!names) {
err = -EINVAL;
goto out;
}
if (names != le16_to_cpu(rec->hard_links)) {
/* Correct minor error on the fly. Do not mark inode as dirty. */
rec->hard_links = cpu_to_le16(names);
ni->mi.dirty = true;
}
set_nlink(inode, names);
if (S_ISDIR(mode)) {
ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
/*
* Dot and dot-dot should be included in count but was not
* included in enumeration.
* Usually a hard links to directories are disabled.
*/
inode->i_op = &ntfs_dir_inode_operations;
inode->i_fop = &ntfs_dir_operations;
ni->i_valid = 0;
} else if (S_ISLNK(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_link_inode_operations;
inode->i_fop = NULL;
inode_nohighmem(inode);
} else if (S_ISREG(mode)) {
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_file_inode_operations;
inode->i_fop = &ntfs_file_operations;
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
if (ino != MFT_REC_MFT)
init_rwsem(&ni->file.run_lock);
} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
S_ISSOCK(mode)) {
inode->i_op = &ntfs_special_inode_operations;
init_special_inode(inode, mode, inode->i_rdev);
} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
/* Records in $Extend are not a files or general directories. */
inode->i_op = &ntfs_file_inode_operations;
} else {
err = -EINVAL;
goto out;
}
if ((sbi->options->sys_immutable &&
(std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
!S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
inode->i_flags |= S_IMMUTABLE;
} else {
inode->i_flags &= ~S_IMMUTABLE;
}
inode->i_mode = mode;
if (!(ni->ni_flags & NI_FLAG_EA)) {
/* If no xattr then no security (stored in xattr). */
inode->i_flags |= S_NOSEC;
}
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;
unlock_new_inode(inode);
return inode;
out:
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;
iget_failed(inode);
return ERR_PTR(err);
}
/*
* ntfs_test_inode
*
* Return: 1 if match.
*/
static int ntfs_test_inode(struct inode *inode, void *data)
{
struct MFT_REF *ref = data;
return ino_get(ref) == inode->i_ino;
}
static int ntfs_set_inode(struct inode *inode, void *data)
{
const struct MFT_REF *ref = data;
inode->i_ino = ino_get(ref);
return 0;
}
struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
const struct cpu_str *name)
{
struct inode *inode;
inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
(void *)ref);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
/* If this is a freshly allocated inode, need to read it now. */
if (inode->i_state & I_NEW)
inode = ntfs_read_mft(inode, name, ref);
else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
/* Inode overlaps? */
_ntfs_bad_inode(inode);
}
if (IS_ERR(inode) && name)
ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
return inode;
}
enum get_block_ctx {
GET_BLOCK_GENERAL = 0,
GET_BLOCK_WRITE_BEGIN = 1,
GET_BLOCK_DIRECT_IO_R = 2,
GET_BLOCK_DIRECT_IO_W = 3,
GET_BLOCK_BMAP = 4,
};
static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
struct buffer_head *bh, int create,
enum get_block_ctx ctx)
{
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
struct page *page = bh->b_page;
u8 cluster_bits = sbi->cluster_bits;
u32 block_size = sb->s_blocksize;
u64 bytes, lbo, valid;
u32 off;
int err;
CLST vcn, lcn, len;
bool new;
/* Clear previous state. */
clear_buffer_new(bh);
clear_buffer_uptodate(bh);
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (!err)
set_buffer_uptodate(bh);
bh->b_size = block_size;
return err;
}
vcn = vbo >> cluster_bits;
off = vbo & sbi->cluster_mask;
new = false;
err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
create && sbi->cluster_size > PAGE_SIZE);
if (err)
goto out;
if (!len)
return 0;
bytes = ((u64)len << cluster_bits) - off;
if (lcn == SPARSE_LCN) {
if (!create) {
if (bh->b_size > bytes)
bh->b_size = bytes;
return 0;
}
WARN_ON(1);
}
if (new)
set_buffer_new(bh);
lbo = ((u64)lcn << cluster_bits) + off;
set_buffer_mapped(bh);
bh->b_bdev = sb->s_bdev;
bh->b_blocknr = lbo >> sb->s_blocksize_bits;
valid = ni->i_valid;
if (ctx == GET_BLOCK_DIRECT_IO_W) {
/* ntfs_direct_IO will update ni->i_valid. */
if (vbo >= valid)
set_buffer_new(bh);
} else if (create) {
/* Normal write. */
if (bytes > bh->b_size)
bytes = bh->b_size;
if (vbo >= valid)
set_buffer_new(bh);
if (vbo + bytes > valid) {
ni->i_valid = vbo + bytes;
mark_inode_dirty(inode);
}
} else if (vbo >= valid) {
/* Read out of valid data. */
clear_buffer_mapped(bh);
} else if (vbo + bytes <= valid) {
/* Normal read. */
} else if (vbo + block_size <= valid) {
/* Normal short read. */
bytes = block_size;
} else {
/*
* Read across valid size: vbo < valid && valid < vbo + block_size
*/
bytes = block_size;
if (page) {
u32 voff = valid - vbo;
bh->b_size = block_size;
off = vbo & (PAGE_SIZE - 1);
set_bh_page(bh, page, off);
err = bh_read(bh, 0);
if (err < 0)
goto out;
zero_user_segment(page, off + voff, off + block_size);
}
}
if (bh->b_size > bytes)
bh->b_size = bytes;
#ifndef __LP64__
if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
static_assert(sizeof(size_t) < sizeof(loff_t));
if (bytes > 0x40000000u)
bh->b_size = 0x40000000u;
}
#endif
return 0;
out:
return err;
}
int ntfs_get_block(struct inode *inode, sector_t vbn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
bh_result, create, GET_BLOCK_GENERAL);
}
static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode,
(u64)vsn << inode->i_sb->s_blocksize_bits,
bh_result, create, GET_BLOCK_BMAP);
}
static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
}
static int ntfs_read_folio(struct file *file, struct folio *folio)
{
struct page *page = &folio->page;
int err;
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (err != E_NTFS_NONRESIDENT) {
unlock_page(page);
return err;
}
}
if (is_compressed(ni)) {
ni_lock(ni);
err = ni_readpage_cmpr(ni, page);
ni_unlock(ni);
return err;
}
/* Normal + sparse files. */
return mpage_read_folio(folio, ntfs_get_block);
}
static void ntfs_readahead(struct readahead_control *rac)
{
struct address_space *mapping = rac->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid;
loff_t pos;
if (is_resident(ni)) {
/* No readahead for resident. */
return;
}
if (is_compressed(ni)) {
/* No readahead for compressed. */
return;
}
valid = ni->i_valid;
pos = readahead_pos(rac);
if (valid < i_size_read(inode) && pos <= valid &&
valid < pos + readahead_length(rac)) {
/* Range cross 'valid'. Read it page by page. */
return;
}
mpage_readahead(rac, ntfs_get_block);
}
static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
bh_result, create, GET_BLOCK_DIRECT_IO_R);
}
static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
bh_result, create, GET_BLOCK_DIRECT_IO_W);
}
static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
loff_t vbo = iocb->ki_pos;
loff_t end;
int wr = iov_iter_rw(iter) & WRITE;
size_t iter_count = iov_iter_count(iter);
loff_t valid;
ssize_t ret;
if (is_resident(ni)) {
/* Switch to buffered write. */
ret = 0;
goto out;
}
ret = blockdev_direct_IO(iocb, inode, iter,
wr ? ntfs_get_block_direct_IO_W :
ntfs_get_block_direct_IO_R);
if (ret > 0)
end = vbo + ret;
else if (wr && ret == -EIOCBQUEUED)
end = vbo + iter_count;
else
goto out;
valid = ni->i_valid;
if (wr) {
if (end > valid && !S_ISBLK(inode->i_mode)) {
ni->i_valid = end;
mark_inode_dirty(inode);
}
} else if (vbo < valid && valid < end) {
/* Fix page. */
iov_iter_revert(iter, end - valid);
iov_iter_zero(end - valid, iter);
}
out:
return ret;
}
int ntfs_set_size(struct inode *inode, u64 new_size)
{
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
int err;
/* Check for maximum file size. */
if (is_sparsed(ni) || is_compressed(ni)) {
if (new_size > sbi->maxbytes_sparse) {
err = -EFBIG;
goto out;
}
} else if (new_size > sbi->maxbytes) {
err = -EFBIG;
goto out;
}
ni_lock(ni);
down_write(&ni->file.run_lock);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
&ni->i_valid, true, NULL);
up_write(&ni->file.run_lock);
ni_unlock(ni);
mark_inode_dirty(inode);
out:
return err;
}
static int ntfs_resident_writepage(struct folio *folio,
struct writeback_control *wbc, void *data)
{
struct address_space *mapping = data;
struct ntfs_inode *ni = ntfs_i(mapping->host);
int ret;
ni_lock(ni);
ret = attr_data_write_resident(ni, &folio->page);
ni_unlock(ni);
if (ret != E_NTFS_NONRESIDENT)
folio_unlock(folio);
mapping_set_error(mapping, ret);
return ret;
}
static int ntfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
if (is_resident(ntfs_i(mapping->host)))
return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
mapping);
return mpage_writepages(mapping, wbc, ntfs_get_block);
}
static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
struct buffer_head *bh_result, int create)
{
return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
bh_result, create, GET_BLOCK_WRITE_BEGIN);
}
int ntfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, u32 len, struct page **pagep, void **fsdata)
{
int err;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
*pagep = NULL;
if (is_resident(ni)) {
struct page *page =
grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
if (!page) {
err = -ENOMEM;
goto out;
}
ni_lock(ni);
err = attr_data_read_resident(ni, page);
ni_unlock(ni);
if (!err) {
*pagep = page;
goto out;
}
unlock_page(page);
put_page(page);
if (err != E_NTFS_NONRESIDENT)
goto out;
}
err = block_write_begin(mapping, pos, len, pagep,
ntfs_get_block_write_begin);
out:
return err;
}
/*
* ntfs_write_end - Address_space_operations::write_end.
*/
int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
u32 len, u32 copied, struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid = ni->i_valid;
bool dirty = false;
int err;
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_write_resident(ni, page);
ni_unlock(ni);
if (!err) {
dirty = true;
/* Clear any buffers in page. */
if (page_has_buffers(page)) {
struct buffer_head *head, *bh;
bh = head = page_buffers(page);
do {
clear_buffer_dirty(bh);
clear_buffer_mapped(bh);
set_buffer_uptodate(bh);
} while (head != (bh = bh->b_this_page));
}
SetPageUptodate(page);
err = copied;
}
unlock_page(page);
put_page(page);
} else {
err = generic_write_end(file, mapping, pos, len, copied, page,
fsdata);
}
if (err >= 0) {
if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
inode->i_ctime = inode->i_mtime = current_time(inode);
ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
dirty = true;
}
if (valid != ni->i_valid) {
/* ni->i_valid is changed in ntfs_get_block_vbo. */
dirty = true;
}
if (pos + err > inode->i_size) {
inode->i_size = pos + err;
dirty = true;
}
if (dirty)
mark_inode_dirty(inode);
}
return err;
}
int reset_log_file(struct inode *inode)
{
int err;
loff_t pos = 0;
u32 log_size = inode->i_size;
struct address_space *mapping = inode->i_mapping;
for (;;) {
u32 len;
void *kaddr;
struct page *page;
len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
err = block_write_begin(mapping, pos, len, &page,
ntfs_get_block_write_begin);
if (err)
goto out;
kaddr = kmap_atomic(page);
memset(kaddr, -1, len);
kunmap_atomic(kaddr);
flush_dcache_page(page);
err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
if (err < 0)
goto out;
pos += len;
if (pos >= log_size)
break;
balance_dirty_pages_ratelimited(mapping);
}
out:
mark_inode_dirty_sync(inode);
return err;
}
int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
{
return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}
int ntfs_sync_inode(struct inode *inode)
{
return _ni_write_inode(inode, 1);
}
/*
* writeback_inode - Helper function for ntfs_flush_inodes().
*
* This writes both the inode and the file data blocks, waiting
* for in flight data blocks before the start of the call. It
* does not wait for any io started during the call.
*/
static int writeback_inode(struct inode *inode)
{
int ret = sync_inode_metadata(inode, 0);
if (!ret)
ret = filemap_fdatawrite(inode->i_mapping);
return ret;
}
/*
* ntfs_flush_inodes
*
* Write data and metadata corresponding to i1 and i2. The io is
* started but we do not wait for any of it to finish.
*
* filemap_flush() is used for the block device, so if there is a dirty
* page for a block already in flight, we will not wait and start the
* io over again.
*/
int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2)
{
int ret = 0;
if (i1)
ret = writeback_inode(i1);
if (!ret && i2)
ret = writeback_inode(i2);
if (!ret)
ret = sync_blockdev_nowait(sb->s_bdev);
return ret;
}
int inode_write_data(struct inode *inode, const void *data, size_t bytes)
{
pgoff_t idx;
/* Write non resident data. */
for (idx = 0; bytes; idx++) {
size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
struct page *page = ntfs_map_page(inode->i_mapping, idx);
if (IS_ERR(page))
return PTR_ERR(page);
lock_page(page);
WARN_ON(!PageUptodate(page));
ClearPageUptodate(page);
memcpy(page_address(page), data, op);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
ntfs_unmap_page(page);
bytes -= op;
data = Add2Ptr(data, PAGE_SIZE);
}
return 0;
}
/*
* ntfs_reparse_bytes
*
* Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
* for unicode string of @uni_len length.
*/
static inline u32 ntfs_reparse_bytes(u32 uni_len)
{
/* Header + unicode string + decorated unicode string. */
return sizeof(short) * (2 * uni_len + 4) +
offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer);
}
static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
u32 size, u16 *nsize)
{
int i, err;
struct REPARSE_DATA_BUFFER *rp;
__le16 *rp_name;
typeof(rp->SymbolicLinkReparseBuffer) *rs;
rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
if (!rp)
return ERR_PTR(-ENOMEM);
rs = &rp->SymbolicLinkReparseBuffer;
rp_name = rs->PathBuffer;
/* Convert link name to UTF-16. */
err = ntfs_nls_to_utf16(sbi, symname, size,
(struct cpu_str *)(rp_name - 1), 2 * size,
UTF16_LITTLE_ENDIAN);
if (err < 0)
goto out;
/* err = the length of unicode name of symlink. */
*nsize = ntfs_reparse_bytes(err);
if (*nsize > sbi->reparse.max_size) {
err = -EFBIG;
goto out;
}
/* Translate Linux '/' into Windows '\'. */
for (i = 0; i < err; i++) {
if (rp_name[i] == cpu_to_le16('/'))
rp_name[i] = cpu_to_le16('\\');
}
rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
rp->ReparseDataLength =
cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer));
/* PrintName + SubstituteName. */
rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
rs->PrintNameLength = rs->SubstituteNameOffset;
/*
* TODO: Use relative path if possible to allow Windows to
* parse this path.
* 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
*/
rs->Flags = 0;
memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
/* Decorate SubstituteName. */
rp_name += err;
rp_name[0] = cpu_to_le16('\\');
rp_name[1] = cpu_to_le16('?');
rp_name[2] = cpu_to_le16('?');
rp_name[3] = cpu_to_le16('\\');
return rp;
out:
kfree(rp);
return ERR_PTR(err);
}
/*
* ntfs_create_inode
*
* Helper function for:
* - ntfs_create
* - ntfs_mknod
* - ntfs_symlink
* - ntfs_mkdir
* - ntfs_atomic_open
*
* NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
*/
struct inode *ntfs_create_inode(struct mnt_idmap *idmap,
struct inode *dir, struct dentry *dentry,
const struct cpu_str *uni, umode_t mode,
dev_t dev, const char *symname, u32 size,
struct ntfs_fnd *fnd)
{
int err;
struct super_block *sb = dir->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
const struct qstr *name = &dentry->d_name;
CLST ino = 0;
struct ntfs_inode *dir_ni = ntfs_i(dir);
struct ntfs_inode *ni = NULL;
struct inode *inode = NULL;
struct ATTRIB *attr;
struct ATTR_STD_INFO5 *std5;
struct ATTR_FILE_NAME *fname;
struct MFT_REC *rec;
u32 asize, dsize, sd_size;
enum FILE_ATTRIBUTE fa;
__le32 security_id = SECURITY_ID_INVALID;
CLST vcn;
const void *sd;
u16 t16, nsize = 0, aid = 0;
struct INDEX_ROOT *root, *dir_root;
struct NTFS_DE *e, *new_de = NULL;
struct REPARSE_DATA_BUFFER *rp = NULL;
bool rp_inserted = false;
if (!fnd)
ni_lock_dir(dir_ni);
dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
if (!dir_root) {
err = -EINVAL;
goto out1;
}
if (S_ISDIR(mode)) {
/* Use parent's directory attributes. */
fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
FILE_ATTRIBUTE_ARCHIVE;
/*
* By default child directory inherits parent attributes.
* Root directory is hidden + system.
* Make an exception for children in root.
*/
if (dir->i_ino == MFT_REC_ROOT)
fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
} else if (S_ISLNK(mode)) {
/* It is good idea that link should be the same type (file/dir) as target */
fa = FILE_ATTRIBUTE_REPARSE_POINT;
/*
* Linux: there are dir/file/symlink and so on.
* NTFS: symlinks are "dir + reparse" or "file + reparse"
* It is good idea to create:
* dir + reparse if 'symname' points to directory
* or
* file + reparse if 'symname' points to file
* Unfortunately kern_path hangs if symname contains 'dir'.
*/
/*
* struct path path;
*
* if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
* struct inode *target = d_inode(path.dentry);
*
* if (S_ISDIR(target->i_mode))
* fa |= FILE_ATTRIBUTE_DIRECTORY;
* // if ( target->i_sb == sb ){
* // use relative path?
* // }
* path_put(&path);
* }
*/
} else if (S_ISREG(mode)) {
if (sbi->options->sparse) {
/* Sparsed regular file, cause option 'sparse'. */
fa = FILE_ATTRIBUTE_SPARSE_FILE |
FILE_ATTRIBUTE_ARCHIVE;
} else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
/* Compressed regular file, if parent is compressed. */
fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
} else {
/* Regular file, default attributes. */
fa = FILE_ATTRIBUTE_ARCHIVE;
}
} else {
fa = FILE_ATTRIBUTE_ARCHIVE;
}
/* If option "hide_dot_files" then set hidden attribute for dot files. */
if (sbi->options->hide_dot_files && name->name[0] == '.')
fa |= FILE_ATTRIBUTE_HIDDEN;
if (!(mode & 0222))
fa |= FILE_ATTRIBUTE_READONLY;
/* Allocate PATH_MAX bytes. */
new_de = __getname();
if (!new_de) {
err = -ENOMEM;
goto out1;
}
/* Mark rw ntfs as dirty. it will be cleared at umount. */
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
/* Step 1: allocate and fill new mft record. */
err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
if (err)
goto out2;
ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
if (IS_ERR(ni)) {
err = PTR_ERR(ni);
ni = NULL;
goto out3;
}
inode = &ni->vfs_inode;
inode_init_owner(idmap, inode, dir, mode);
mode = inode->i_mode;
ni->i_crtime = current_time(inode);
rec = ni->mi.mrec;
rec->hard_links = cpu_to_le16(1);
attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
/* Get default security id. */
sd = s_default_security;
sd_size = sizeof(s_default_security);
if (is_ntfs3(sbi)) {
security_id = dir_ni->std_security_id;
if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
security_id = sbi->security.def_security_id;
if (security_id == SECURITY_ID_INVALID &&
!ntfs_insert_security(sbi, sd, sd_size,
&security_id, NULL))
sbi->security.def_security_id = security_id;
}
}
/* Insert standard info. */
std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
if (security_id == SECURITY_ID_INVALID) {
dsize = sizeof(struct ATTR_STD_INFO);
} else {
dsize = sizeof(struct ATTR_STD_INFO5);
std5->security_id = security_id;
ni->std_security_id = security_id;
}
asize = SIZEOF_RESIDENT + dsize;
attr->type = ATTR_STD;
attr->size = cpu_to_le32(asize);
attr->id = cpu_to_le16(aid++);
attr->res.data_off = SIZEOF_RESIDENT_LE;
attr->res.data_size = cpu_to_le32(dsize);
std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
kernel2nt(&ni->i_crtime);
std5->fa = ni->std_fa = fa;
attr = Add2Ptr(attr, asize);
/* Insert file name. */
err = fill_name_de(sbi, new_de, name, uni);
if (err)
goto out4;
mi_get_ref(&ni->mi, &new_de->ref);
fname = (struct ATTR_FILE_NAME *)(new_de + 1);
if (sbi->options->windows_names &&
!valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
err = -EINVAL;
goto out4;
}
mi_get_ref(&dir_ni->mi, &fname->home);
fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
fname->dup.a_time = std5->cr_time;
fname->dup.alloc_size = fname->dup.data_size = 0;
fname->dup.fa = std5->fa;
fname->dup.ea_size = fname->dup.reparse = 0;
dsize = le16_to_cpu(new_de->key_size);
asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
attr->type = ATTR_NAME;
attr->size = cpu_to_le32(asize);
attr->res.data_off = SIZEOF_RESIDENT_LE;
attr->res.flags = RESIDENT_FLAG_INDEXED;
attr->id = cpu_to_le16(aid++);
attr->res.data_size = cpu_to_le32(dsize);
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
attr = Add2Ptr(attr, asize);
if (security_id == SECURITY_ID_INVALID) {
/* Insert security attribute. */
asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
attr->type = ATTR_SECURE;
attr->size = cpu_to_le32(asize);
attr->id = cpu_to_le16(aid++);
attr->res.data_off = SIZEOF_RESIDENT_LE;
attr->res.data_size = cpu_to_le32(sd_size);
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
attr = Add2Ptr(attr, asize);
}
attr->id = cpu_to_le16(aid++);
if (fa & FILE_ATTRIBUTE_DIRECTORY) {
/*
* Regular directory or symlink to directory.
* Create root attribute.
*/
dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
attr->type = ATTR_ROOT;
attr->size = cpu_to_le32(asize);
attr->name_len = ARRAY_SIZE(I30_NAME);
attr->name_off = SIZEOF_RESIDENT_LE;
attr->res.data_off =
cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
attr->res.data_size = cpu_to_le32(dsize);
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
sizeof(I30_NAME));
root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
root->ihdr.de_off =
cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
sizeof(struct NTFS_DE));
root->ihdr.total = root->ihdr.used;
e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
e->size = cpu_to_le16(sizeof(struct NTFS_DE));
e->flags = NTFS_IE_LAST;
} else if (S_ISLNK(mode)) {
/*
* Symlink to file.
* Create empty resident data attribute.
*/
asize = SIZEOF_RESIDENT;
/* Insert empty ATTR_DATA */
attr->type = ATTR_DATA;
attr->size = cpu_to_le32(SIZEOF_RESIDENT);
attr->name_off = SIZEOF_RESIDENT_LE;
attr->res.data_off = SIZEOF_RESIDENT_LE;
} else if (S_ISREG(mode)) {
/*
* Regular file. Create empty non resident data attribute.
*/
attr->type = ATTR_DATA;
attr->non_res = 1;
attr->nres.evcn = cpu_to_le64(-1ll);
if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
attr->flags = ATTR_FLAG_SPARSED;
asize = SIZEOF_NONRESIDENT_EX + 8;
} else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
attr->flags = ATTR_FLAG_COMPRESSED;
attr->nres.c_unit = COMPRESSION_UNIT;
asize = SIZEOF_NONRESIDENT_EX + 8;
} else {
attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
attr->name_off = SIZEOF_NONRESIDENT_LE;
asize = SIZEOF_NONRESIDENT + 8;
}
attr->nres.run_off = attr->name_off;
} else {
/*
* Node. Create empty resident data attribute.
*/
attr->type = ATTR_DATA;
attr->size = cpu_to_le32(SIZEOF_RESIDENT);
attr->name_off = SIZEOF_RESIDENT_LE;
if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
attr->flags = ATTR_FLAG_SPARSED;
else if (fa & FILE_ATTRIBUTE_COMPRESSED)
attr->flags = ATTR_FLAG_COMPRESSED;
attr->res.data_off = SIZEOF_RESIDENT_LE;
asize = SIZEOF_RESIDENT;
ni->ni_flags |= NI_FLAG_RESIDENT;
}
if (S_ISDIR(mode)) {
ni->ni_flags |= NI_FLAG_DIR;
err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
if (err)
goto out4;
} else if (S_ISLNK(mode)) {
rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
if (IS_ERR(rp)) {
err = PTR_ERR(rp);
rp = NULL;
goto out4;
}
/*
* Insert ATTR_REPARSE.
*/
attr = Add2Ptr(attr, asize);
attr->type = ATTR_REPARSE;
attr->id = cpu_to_le16(aid++);
/* Resident or non resident? */
asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
t16 = PtrOffset(rec, attr);
/*
* Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
* It is good idea to keep extened attributes resident.
*/
if (asize + t16 + 0x78 + 8 > sbi->record_size) {
CLST alen;
CLST clst = bytes_to_cluster(sbi, nsize);
/* Bytes per runs. */
t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
attr->non_res = 1;
attr->nres.evcn = cpu_to_le64(clst - 1);
attr->name_off = SIZEOF_NONRESIDENT_LE;
attr->nres.run_off = attr->name_off;
attr->nres.data_size = cpu_to_le64(nsize);
attr->nres.valid_size = attr->nres.data_size;
attr->nres.alloc_size =
cpu_to_le64(ntfs_up_cluster(sbi, nsize));
err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
clst, NULL, ALLOCATE_DEF,
&alen, 0, NULL, NULL);
if (err)
goto out5;
err = run_pack(&ni->file.run, 0, clst,
Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
&vcn);
if (err < 0)
goto out5;
if (vcn != clst) {
err = -EINVAL;
goto out5;
}
asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
/* Write non resident data. */
err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
nsize, 0);
if (err)
goto out5;
} else {
attr->res.data_off = SIZEOF_RESIDENT_LE;
attr->res.data_size = cpu_to_le32(nsize);
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
}
/* Size of symlink equals the length of input string. */
inode->i_size = size;
attr->size = cpu_to_le32(asize);
err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
&new_de->ref);
if (err)
goto out5;
rp_inserted = true;
}
attr = Add2Ptr(attr, asize);
attr->type = ATTR_END;
rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
rec->next_attr_id = cpu_to_le16(aid);
inode->i_generation = le16_to_cpu(rec->seq);
if (S_ISDIR(mode)) {
inode->i_op = &ntfs_dir_inode_operations;
inode->i_fop = &ntfs_dir_operations;
} else if (S_ISLNK(mode)) {
inode->i_op = &ntfs_link_inode_operations;
inode->i_fop = NULL;
inode->i_mapping->a_ops = &ntfs_aops;
inode->i_size = size;
inode_nohighmem(inode);
} else if (S_ISREG(mode)) {
inode->i_op = &ntfs_file_inode_operations;
inode->i_fop = &ntfs_file_operations;
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
init_rwsem(&ni->file.run_lock);
} else {
inode->i_op = &ntfs_special_inode_operations;
init_special_inode(inode, mode, dev);
}
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
err = ntfs_init_acl(idmap, inode, dir);
if (err)
goto out5;
} else
#endif
{
inode->i_flags |= S_NOSEC;
}
/*
* ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
* The packed size of extended attribute is stored in direntry too.
* 'fname' here points to inside new_de.
*/
ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
/*
* update ea_size in file_name attribute too.
* Use ni_find_attr cause layout of MFT record may be changed
* in ntfs_init_acl and ntfs_save_wsl_perm.
*/
attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
if (attr) {
struct ATTR_FILE_NAME *fn;
fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
if (fn)
fn->dup.ea_size = fname->dup.ea_size;
}
/* We do not need to update parent directory later */
ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
/* Step 2: Add new name in index. */
err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
if (err)
goto out6;
/*
* Call 'd_instantiate' after inode->i_op is set
* but before finish_open.
*/
d_instantiate(dentry, inode);
/* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
inode->i_atime = inode->i_mtime = inode->i_ctime = dir->i_mtime =
dir->i_ctime = ni->i_crtime;
mark_inode_dirty(dir);
mark_inode_dirty(inode);
/* Normal exit. */
goto out2;
out6:
if (rp_inserted)
ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
out5:
if (!S_ISDIR(mode))
run_deallocate(sbi, &ni->file.run, false);
out4:
clear_rec_inuse(rec);
clear_nlink(inode);
ni->mi.dirty = false;
discard_new_inode(inode);
out3:
ntfs_mark_rec_free(sbi, ino, false);
out2:
__putname(new_de);
kfree(rp);
out1:
if (!fnd)
ni_unlock(dir_ni);
if (err)
return ERR_PTR(err);
unlock_new_inode(inode);
return inode;
}
int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
{
int err;
struct ntfs_inode *ni = ntfs_i(inode);
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
struct NTFS_DE *de;
/* Allocate PATH_MAX bytes. */
de = __getname();
if (!de)
return -ENOMEM;
/* Mark rw ntfs as dirty. It will be cleared at umount. */
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
/* Construct 'de'. */
err = fill_name_de(sbi, de, &dentry->d_name, NULL);
if (err)
goto out;
err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
out:
__putname(de);
return err;
}
/*
* ntfs_unlink_inode
*
* inode_operations::unlink
* inode_operations::rmdir
*/
int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
{
int err;
struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
struct inode *inode = d_inode(dentry);
struct ntfs_inode *ni = ntfs_i(inode);
struct ntfs_inode *dir_ni = ntfs_i(dir);
struct NTFS_DE *de, *de2 = NULL;
int undo_remove;
if (ntfs_is_meta_file(sbi, ni->mi.rno))
return -EINVAL;
/* Allocate PATH_MAX bytes. */
de = __getname();
if (!de)
return -ENOMEM;
ni_lock(ni);
if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
err = -ENOTEMPTY;
goto out;
}
err = fill_name_de(sbi, de, &dentry->d_name, NULL);
if (err < 0)
goto out;
undo_remove = 0;
err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
if (!err) {
drop_nlink(inode);
dir->i_mtime = dir->i_ctime = current_time(dir);
mark_inode_dirty(dir);
inode->i_ctime = dir->i_ctime;
if (inode->i_nlink)
mark_inode_dirty(inode);
} else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
_ntfs_bad_inode(inode);
} else {
if (ni_is_dirty(dir))
mark_inode_dirty(dir);
if (ni_is_dirty(inode))
mark_inode_dirty(inode);
}
out:
ni_unlock(ni);
__putname(de);
return err;
}
void ntfs_evict_inode(struct inode *inode)
{
truncate_inode_pages_final(&inode->i_data);
invalidate_inode_buffers(inode);
clear_inode(inode);
ni_clear(ntfs_i(inode));
}
/*
* ntfs_translate_junction
*
* Translate a Windows junction target to the Linux equivalent.
* On junctions, targets are always absolute (they include the drive
* letter). We have no way of knowing if the target is for the current
* mounted device or not so we just assume it is.
*/
static int ntfs_translate_junction(const struct super_block *sb,
const struct dentry *link_de, char *target,
int target_len, int target_max)
{
int tl_len, err = target_len;
char *link_path_buffer = NULL, *link_path;
char *translated = NULL;
char *target_start;
int copy_len;
link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
if (!link_path_buffer) {
err = -ENOMEM;
goto out;
}
/* Get link path, relative to mount point */
link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
if (IS_ERR(link_path)) {
ntfs_err(sb, "Error getting link path");
err = -EINVAL;
goto out;
}
translated = kmalloc(PATH_MAX, GFP_NOFS);
if (!translated) {
err = -ENOMEM;
goto out;
}
/* Make translated path a relative path to mount point */
strcpy(translated, "./");
++link_path; /* Skip leading / */
for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
if (*link_path == '/') {
if (PATH_MAX - tl_len < sizeof("../")) {
ntfs_err(sb,
"Link path %s has too many components",
link_path);
err = -EINVAL;
goto out;
}
strcpy(translated + tl_len, "../");
tl_len += sizeof("../") - 1;
}
}
/* Skip drive letter */
target_start = target;
while (*target_start && *target_start != ':')
++target_start;
if (!*target_start) {
ntfs_err(sb, "Link target (%s) missing drive separator",
target);
err = -EINVAL;
goto out;
}
/* Skip drive separator and leading /, if exists */
target_start += 1 + (target_start[1] == '/');
copy_len = target_len - (target_start - target);
if (PATH_MAX - tl_len <= copy_len) {
ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
target_start, PATH_MAX - tl_len, copy_len);
err = -EINVAL;
goto out;
}
/* translated path has a trailing / and target_start does not */
strcpy(translated + tl_len, target_start);
tl_len += copy_len;
if (target_max <= tl_len) {
ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
translated, target_max, tl_len);
err = -EINVAL;
goto out;
}
strcpy(target, translated);
err = tl_len;
out:
kfree(link_path_buffer);
kfree(translated);
return err;
}
static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
struct inode *inode, char *buffer,
int buflen)
{
int i, err = -EINVAL;
struct ntfs_inode *ni = ntfs_i(inode);
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
u64 size;
u16 ulen = 0;
void *to_free = NULL;
struct REPARSE_DATA_BUFFER *rp;
const __le16 *uname;
struct ATTRIB *attr;
/* Reparse data present. Try to parse it. */
static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
*buffer = 0;
attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
if (!attr)
goto out;
if (!attr->non_res) {
rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
if (!rp)
goto out;
size = le32_to_cpu(attr->res.data_size);
} else {
size = le64_to_cpu(attr->nres.data_size);
rp = NULL;
}
if (size > sbi->reparse.max_size || size <= sizeof(u32))
goto out;
if (!rp) {
rp = kmalloc(size, GFP_NOFS);
if (!rp) {
err = -ENOMEM;
goto out;
}
to_free = rp;
/* Read into temporal buffer. */
err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
if (err)
goto out;
}
/* Microsoft Tag. */
switch (rp->ReparseTag) {
case IO_REPARSE_TAG_MOUNT_POINT:
/* Mount points and junctions. */
/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
if (size <= offsetof(struct REPARSE_DATA_BUFFER,
MountPointReparseBuffer.PathBuffer))
goto out;
uname = Add2Ptr(rp,
offsetof(struct REPARSE_DATA_BUFFER,
MountPointReparseBuffer.PathBuffer) +
le16_to_cpu(rp->MountPointReparseBuffer
.PrintNameOffset));
ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
break;
case IO_REPARSE_TAG_SYMLINK:
/* FolderSymbolicLink */
/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
if (size <= offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer))
goto out;
uname = Add2Ptr(
rp, offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer) +
le16_to_cpu(rp->SymbolicLinkReparseBuffer
.PrintNameOffset));
ulen = le16_to_cpu(
rp->SymbolicLinkReparseBuffer.PrintNameLength);
break;
case IO_REPARSE_TAG_CLOUD:
case IO_REPARSE_TAG_CLOUD_1:
case IO_REPARSE_TAG_CLOUD_2:
case IO_REPARSE_TAG_CLOUD_3:
case IO_REPARSE_TAG_CLOUD_4:
case IO_REPARSE_TAG_CLOUD_5:
case IO_REPARSE_TAG_CLOUD_6:
case IO_REPARSE_TAG_CLOUD_7:
case IO_REPARSE_TAG_CLOUD_8:
case IO_REPARSE_TAG_CLOUD_9:
case IO_REPARSE_TAG_CLOUD_A:
case IO_REPARSE_TAG_CLOUD_B:
case IO_REPARSE_TAG_CLOUD_C:
case IO_REPARSE_TAG_CLOUD_D:
case IO_REPARSE_TAG_CLOUD_E:
case IO_REPARSE_TAG_CLOUD_F:
err = sizeof("OneDrive") - 1;
if (err > buflen)
err = buflen;
memcpy(buffer, "OneDrive", err);
goto out;
default:
if (IsReparseTagMicrosoft(rp->ReparseTag)) {
/* Unknown Microsoft Tag. */
goto out;
}
if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
size <= sizeof(struct REPARSE_POINT)) {
goto out;
}
/* Users tag. */
uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
ulen = le16_to_cpu(rp->ReparseDataLength) -
sizeof(struct REPARSE_POINT);
}
/* Convert nlen from bytes to UNICODE chars. */
ulen >>= 1;
/* Check that name is available. */
if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
goto out;
/* If name is already zero terminated then truncate it now. */
if (!uname[ulen - 1])
ulen -= 1;
err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
if (err < 0)
goto out;
/* Translate Windows '\' into Linux '/'. */
for (i = 0; i < err; i++) {
if (buffer[i] == '\\')
buffer[i] = '/';
}
/* Always set last zero. */
buffer[err] = 0;
/* If this is a junction, translate the link target. */
if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
out:
kfree(to_free);
return err;
}
static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
struct delayed_call *done)
{
int err;
char *ret;
if (!de)
return ERR_PTR(-ECHILD);
ret = kmalloc(PAGE_SIZE, GFP_NOFS);
if (!ret)
return ERR_PTR(-ENOMEM);
err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
if (err < 0) {
kfree(ret);
return ERR_PTR(err);
}
set_delayed_call(done, kfree_link, ret);
return ret;
}
// clang-format off
const struct inode_operations ntfs_link_inode_operations = {
.get_link = ntfs_get_link,
.setattr = ntfs3_setattr,
.listxattr = ntfs_listxattr,
};
const struct address_space_operations ntfs_aops = {
.read_folio = ntfs_read_folio,
.readahead = ntfs_readahead,
.writepages = ntfs_writepages,
.write_begin = ntfs_write_begin,
.write_end = ntfs_write_end,
.direct_IO = ntfs_direct_IO,
.bmap = ntfs_bmap,
.dirty_folio = block_dirty_folio,
.migrate_folio = buffer_migrate_folio,
.invalidate_folio = block_invalidate_folio,
};
const struct address_space_operations ntfs_aops_cmpr = {
.read_folio = ntfs_read_folio,
.readahead = ntfs_readahead,
};
// clang-format on