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78ab59fee0
linux/fs/ntfs3/inode.c
Konstantin Komarov 78ab59fee0
fs/ntfs3: Rework file operations 
Rename now works "Add new name and remove old name".
"Remove old name and add new name" may result in bad inode
if we can't add new name and then can't restore (add) old name.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
2021-08-31 19:07:11 +03:00

1958 lines
46 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/iversion.h>
#include <linux/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 = -EINVAL;
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))
goto Ok;
/* Record should contain $I30 root. */
is_dir = rec->flags & RECORD_FLAG_DIR;
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);
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);
t32 = asize;
} else {
t32 = le16_to_cpu(attr->nres.run_off);
}
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);
is_root = true;
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;
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:
if (!attr->non_res) {
inode->i_size = rsize;
inode_set_bytes(inode, rsize);
t32 = asize;
} else {
inode->i_size =
le64_to_cpu(attr->nres.data_size);
t32 = le16_to_cpu(attr->nres.run_off);
}
/* Looks like normal symlink. */
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);
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. */
} 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;
}
Ok:
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? */
make_bad_inode(inode);
}
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);
/* Direct write uses 'create=0'. */
if (!create && vbo >= ni->i_valid) {
/* Out of valid. */
return 0;
}
if (vbo >= inode->i_size) {
/* Out of size. */
return 0;
}
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);
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);
if ((len << cluster_bits) > block_size)
ntfs_sparse_cluster(inode, page, vcn, len);
}
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. */
/* Should never be here 'cause already checked. */
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);
ll_rw_block(REQ_OP_READ, 0, 1, &bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
err = -EIO;
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_readpage(struct file *file, struct page *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_readpage(page, 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;
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)
goto out;
end = vbo + ret;
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_writepage(struct page *page, struct writeback_control *wbc)
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
int err;
if (is_resident(ni)) {
ni_lock(ni);
err = attr_data_write_resident(ni, page);
ni_unlock(ni);
if (err != E_NTFS_NONRESIDENT) {
unlock_page(page);
return err;
}
}
return block_write_full_page(page, ntfs_get_block, wbc);
}
static int ntfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
/* Redirect call to 'ntfs_writepage' for resident files. */
get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;
return mpage_writepages(mapping, wbc, 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);
}
static int ntfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, u32 len, u32 flags, 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, flags);
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, flags, pagep,
ntfs_get_block_write_begin);
out:
return err;
}
/*
* ntfs_write_end - Address_space_operations::write_end.
*/
static 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 (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, 0, &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 = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
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 to 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);
}
struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
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;
dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
if (!dir_root)
return ERR_PTR(-EINVAL);
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 (!(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(mnt_userns, inode, dir, mode);
mode = inode->i_mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = 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(&inode->i_atime);
ni->std_fa = fa;
std5->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);
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);
/* 0x78 - the size of EA + EAINFO to store WSL */
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, 0, &alen, 0,
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);
inode->i_size = nsize;
} else {
attr->res.data_off = SIZEOF_RESIDENT_LE;
attr->res.data_size = cpu_to_le32(nsize);
memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
inode->i_size = nsize;
nsize = 0;
}
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);
/* 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;
inode->i_generation = le16_to_cpu(rec->seq);
dir->i_mtime = dir->i_ctime = inode->i_atime;
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;
} 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(mnt_userns, inode, dir);
if (err)
goto out6;
} else
#endif
{
inode->i_flags |= S_NOSEC;
}
/* Write non resident data. */
if (nsize) {
err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize);
if (err)
goto out7;
}
/*
* Call 'd_instantiate' after inode->i_op is set
* but before finish_open.
*/
d_instantiate(dentry, inode);
ntfs_save_wsl_perm(inode);
mark_inode_dirty(dir);
mark_inode_dirty(inode);
/* Normal exit. */
goto out2;
out7:
/* Undo 'indx_insert_entry'. */
indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
le16_to_cpu(new_de->key_size), sbi);
out6:
if (rp_inserted)
ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
out5:
if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
goto out4;
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);
out2:
__putname(new_de);
kfree(rp);
out1:
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;
struct ATTR_FILE_NAME *de_name;
/* 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;
de_name = (struct ATTR_FILE_NAME *)(de + 1);
/* Fill duplicate info. */
de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
de_name->dup.a_time = kernel2nt(&inode->i_ctime);
de_name->dup.alloc_size = de_name->dup.data_size =
cpu_to_le64(inode->i_size);
de_name->dup.fa = ni->std_fa;
de_name->dup.ea_size = de_name->dup.reparse = 0;
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)) {
make_bad_inode(inode);
ntfs_inode_err(inode, "failed to undo unlink");
ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
} 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);
if (inode->i_nlink)
_ni_write_inode(inode, inode_needs_sync(inode));
invalidate_inode_buffers(inode);
clear_inode(inode);
ni_clear(ntfs_i(inode));
}
static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
int buflen)
{
int i, 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;
u64 i_size = inode->i_size;
u16 nlen = 0;
void *to_free = NULL;
struct REPARSE_DATA_BUFFER *rp;
struct le_str *uni;
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;
/* Read into temporal buffer. */
if (i_size > sbi->reparse.max_size || i_size <= sizeof(u32)) {
err = -EINVAL;
goto out;
}
attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
if (!attr) {
err = -EINVAL;
goto out;
}
if (!attr->non_res) {
rp = resident_data_ex(attr, i_size);
if (!rp) {
err = -EINVAL;
goto out;
}
} else {
rp = kmalloc(i_size, GFP_NOFS);
if (!rp) {
err = -ENOMEM;
goto out;
}
to_free = rp;
err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, i_size, NULL);
if (err)
goto out;
}
err = -EINVAL;
/* Microsoft Tag. */
switch (rp->ReparseTag) {
case IO_REPARSE_TAG_MOUNT_POINT:
/* Mount points and junctions. */
/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
MountPointReparseBuffer.PathBuffer))
goto out;
uni = Add2Ptr(rp,
offsetof(struct REPARSE_DATA_BUFFER,
MountPointReparseBuffer.PathBuffer) +
le16_to_cpu(rp->MountPointReparseBuffer
.PrintNameOffset) -
2);
nlen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
break;
case IO_REPARSE_TAG_SYMLINK:
/* FolderSymbolicLink */
/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer))
goto out;
uni = Add2Ptr(rp,
offsetof(struct REPARSE_DATA_BUFFER,
SymbolicLinkReparseBuffer.PathBuffer) +
le16_to_cpu(rp->SymbolicLinkReparseBuffer
.PrintNameOffset) -
2);
nlen = 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) ||
i_size <= sizeof(struct REPARSE_POINT)) {
goto out;
}
/* Users tag. */
uni = Add2Ptr(rp, sizeof(struct REPARSE_POINT) - 2);
nlen = le16_to_cpu(rp->ReparseDataLength) -
sizeof(struct REPARSE_POINT);
}
/* Convert nlen from bytes to UNICODE chars. */
nlen >>= 1;
/* Check that name is available. */
if (!nlen || &uni->name[nlen] > (__le16 *)Add2Ptr(rp, i_size))
goto out;
/* If name is already zero terminated then truncate it now. */
if (!uni->name[nlen - 1])
nlen -= 1;
uni->len = nlen;
err = ntfs_utf16_to_nls(sbi, uni, 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;
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(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,
.permission = ntfs_permission,
.get_acl = ntfs_get_acl,
.set_acl = ntfs_set_acl,
};
const struct address_space_operations ntfs_aops = {
.readpage = ntfs_readpage,
.readahead = ntfs_readahead,
.writepage = ntfs_writepage,
.writepages = ntfs_writepages,
.write_begin = ntfs_write_begin,
.write_end = ntfs_write_end,
.direct_IO = ntfs_direct_IO,
.bmap = ntfs_bmap,
.set_page_dirty = __set_page_dirty_buffers,
};
const struct address_space_operations ntfs_aops_cmpr = {
.readpage = ntfs_readpage,
.readahead = ntfs_readahead,
};
// clang-format on
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