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file.c
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
* Regular file handling primitives for NTFS-based filesystems.
*
*/
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/compat.h>
#include <linux/falloc.h>
#include <linux/fiemap.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
{
struct fstrim_range __user *user_range;
struct fstrim_range range;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
return -EOPNOTSUPP;
user_range = (struct fstrim_range __user *)arg;
if (copy_from_user(&range, user_range, sizeof(range)))
return -EFAULT;
range.minlen = max_t(u32, range.minlen,
bdev_discard_granularity(sbi->sb->s_bdev));
err = ntfs_trim_fs(sbi, &range);
if (err < 0)
return err;
if (copy_to_user(user_range, &range, sizeof(range)))
return -EFAULT;
return 0;
}
static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
switch (cmd) {
case FITRIM:
return ntfs_ioctl_fitrim(sbi, arg);
}
return -ENOTTY; /* Inappropriate ioctl for device. */
}
#ifdef CONFIG_COMPAT
static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
{
return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif
/*
* ntfs_getattr - inode_operations::getattr
*/
int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
struct kstat *stat, u32 request_mask, u32 flags)
{
struct inode *inode = d_inode(path->dentry);
struct ntfs_inode *ni = ntfs_i(inode);
if (is_compressed(ni))
stat->attributes |= STATX_ATTR_COMPRESSED;
if (is_encrypted(ni))
stat->attributes |= STATX_ATTR_ENCRYPTED;
stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
generic_fillattr(mnt_userns, inode, stat);
stat->result_mask |= STATX_BTIME;
stat->btime = ni->i_crtime;
stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
return 0;
}
static int ntfs_extend_initialized_size(struct file *file,
struct ntfs_inode *ni,
const loff_t valid,
const loff_t new_valid)
{
struct inode *inode = &ni->vfs_inode;
struct address_space *mapping = inode->i_mapping;
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
loff_t pos = valid;
int err;
if (is_resident(ni)) {
ni->i_valid = new_valid;
return 0;
}
WARN_ON(is_compressed(ni));
WARN_ON(valid >= new_valid);
for (;;) {
u32 zerofrom, len;
struct page *page;
u8 bits;
CLST vcn, lcn, clen;
if (is_sparsed(ni)) {
bits = sbi->cluster_bits;
vcn = pos >> bits;
err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
NULL);
if (err)
goto out;
if (lcn == SPARSE_LCN) {
pos = ((loff_t)clen + vcn) << bits;
ni->i_valid = pos;
goto next;
}
}
zerofrom = pos & (PAGE_SIZE - 1);
len = PAGE_SIZE - zerofrom;
if (pos + len > new_valid)
len = new_valid - pos;
err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
if (err)
goto out;
zero_user_segment(page, zerofrom, PAGE_SIZE);
/* This function in any case puts page. */
err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
if (err < 0)
goto out;
pos += len;
next:
if (pos >= new_valid)
break;
balance_dirty_pages_ratelimited(mapping);
cond_resched();
}
return 0;
out:
ni->i_valid = valid;
ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
new_valid);
return err;
}
/*
* ntfs_zero_range - Helper function for punch_hole.
*
* It zeroes a range [vbo, vbo_to).
*/
static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
{
int err = 0;
struct address_space *mapping = inode->i_mapping;
u32 blocksize = 1 << inode->i_blkbits;
pgoff_t idx = vbo >> PAGE_SHIFT;
u32 z_start = vbo & (PAGE_SIZE - 1);
pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
loff_t page_off;
struct buffer_head *head, *bh;
u32 bh_next, bh_off, z_end;
sector_t iblock;
struct page *page;
for (; idx < idx_end; idx += 1, z_start = 0) {
page_off = (loff_t)idx << PAGE_SHIFT;
z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
: PAGE_SIZE;
iblock = page_off >> inode->i_blkbits;
page = find_or_create_page(mapping, idx,
mapping_gfp_constraint(mapping,
~__GFP_FS));
if (!page)
return -ENOMEM;
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
bh = head = page_buffers(page);
bh_off = 0;
do {
bh_next = bh_off + blocksize;
if (bh_next <= z_start || bh_off >= z_end)
continue;
if (!buffer_mapped(bh)) {
ntfs_get_block(inode, iblock, bh, 0);
/* Unmapped? It's a hole - nothing to do. */
if (!buffer_mapped(bh))
continue;
}
/* Ok, it's mapped. Make sure it's up-to-date. */
if (PageUptodate(page))
set_buffer_uptodate(bh);
if (!buffer_uptodate(bh)) {
lock_buffer(bh);
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
submit_bh(REQ_OP_READ, bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
unlock_page(page);
put_page(page);
err = -EIO;
goto out;
}
}
mark_buffer_dirty(bh);
} while (bh_off = bh_next, iblock += 1,
head != (bh = bh->b_this_page));
zero_user_segment(page, z_start, z_end);
unlock_page(page);
put_page(page);
cond_resched();
}
out:
mark_inode_dirty(inode);
return err;
}
/*
* ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
*
* NOTE: 512 <= cluster size <= 2M
*/
void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
CLST len)
{
struct address_space *mapping = inode->i_mapping;
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
u8 cluster_bits = sbi->cluster_bits;
u64 vbo = (u64)vcn << cluster_bits;
u64 bytes = (u64)len << cluster_bits;
u32 blocksize = 1 << inode->i_blkbits;
pgoff_t idx0 = page0 ? page0->index : -1;
loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
pgoff_t idx = vbo_clst >> PAGE_SHIFT;
u32 from = vbo_clst & (PAGE_SIZE - 1);
pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
loff_t page_off;
u32 to;
bool partial;
struct page *page;
for (; idx < idx_end; idx += 1, from = 0) {
page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
if (!page)
continue;
page_off = (loff_t)idx << PAGE_SHIFT;
to = (page_off + PAGE_SIZE) > end ? (end - page_off)
: PAGE_SIZE;
partial = false;
if ((from || PAGE_SIZE != to) &&
likely(!page_has_buffers(page))) {
create_empty_buffers(page, blocksize, 0);
}
if (page_has_buffers(page)) {
struct buffer_head *head, *bh;
u32 bh_off = 0;
bh = head = page_buffers(page);
do {
u32 bh_next = bh_off + blocksize;
if (from <= bh_off && bh_next <= to) {
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
} else if (!buffer_uptodate(bh)) {
partial = true;
}
bh_off = bh_next;
} while (head != (bh = bh->b_this_page));
}
zero_user_segment(page, from, to);
if (!partial)
SetPageUptodate(page);
flush_dcache_page(page);
set_page_dirty(page);
if (idx != idx0) {
unlock_page(page);
put_page(page);
}
cond_resched();
}
}
/*
* ntfs_file_mmap - file_operations::mmap
*/
static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
bool rw = vma->vm_flags & VM_WRITE;
int err;
if (is_encrypted(ni)) {
ntfs_inode_warn(inode, "mmap encrypted not supported");
return -EOPNOTSUPP;
}
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "mmap deduplicated not supported");
return -EOPNOTSUPP;
}
if (is_compressed(ni) && rw) {
ntfs_inode_warn(inode, "mmap(write) compressed not supported");
return -EOPNOTSUPP;
}
if (rw) {
u64 to = min_t(loff_t, i_size_read(inode),
from + vma->vm_end - vma->vm_start);
if (is_sparsed(ni)) {
/* Allocate clusters for rw map. */
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
CLST lcn, len;
CLST vcn = from >> sbi->cluster_bits;
CLST end = bytes_to_cluster(sbi, to);
bool new;
for (; vcn < end; vcn += len) {
err = attr_data_get_block(ni, vcn, 1, &lcn,
&len, &new);
if (err)
goto out;
if (!new)
continue;
ntfs_sparse_cluster(inode, NULL, vcn, 1);
}
}
if (ni->i_valid < to) {
if (!inode_trylock(inode)) {
err = -EAGAIN;
goto out;
}
err = ntfs_extend_initialized_size(file, ni,
ni->i_valid, to);
inode_unlock(inode);
if (err)
goto out;
}
}
err = generic_file_mmap(file, vma);
out:
return err;
}
static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
struct file *file)
{
struct ntfs_inode *ni = ntfs_i(inode);
struct address_space *mapping = inode->i_mapping;
loff_t end = pos + count;
bool extend_init = file && pos > ni->i_valid;
int err;
if (end <= inode->i_size && !extend_init)
return 0;
/* Mark rw ntfs as dirty. It will be cleared at umount. */
ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
if (end > inode->i_size) {
err = ntfs_set_size(inode, end);
if (err)
goto out;
inode->i_size = end;
}
if (extend_init && !is_compressed(ni)) {
err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
if (err)
goto out;
} else {
err = 0;
}
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
if (IS_SYNC(inode)) {
int err2;
err = filemap_fdatawrite_range(mapping, pos, end - 1);
err2 = sync_mapping_buffers(mapping);
if (!err)
err = err2;
err2 = write_inode_now(inode, 1);
if (!err)
err = err2;
if (!err)
err = filemap_fdatawait_range(mapping, pos, end - 1);
}
out:
return err;
}
static int ntfs_truncate(struct inode *inode, loff_t new_size)
{
struct super_block *sb = inode->i_sb;
struct ntfs_inode *ni = ntfs_i(inode);
int err, dirty = 0;
u64 new_valid;
if (!S_ISREG(inode->i_mode))
return 0;
if (is_compressed(ni)) {
if (ni->i_valid > new_size)
ni->i_valid = new_size;
} else {
err = block_truncate_page(inode->i_mapping, new_size,
ntfs_get_block);
if (err)
return err;
}
new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
ni_lock(ni);
truncate_setsize(inode, new_size);
down_write(&ni->file.run_lock);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
&new_valid, ni->mi.sbi->options->prealloc, NULL);
up_write(&ni->file.run_lock);
if (new_valid < ni->i_valid)
ni->i_valid = new_valid;
ni_unlock(ni);
ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
inode->i_ctime = inode->i_mtime = current_time(inode);
if (!IS_DIRSYNC(inode)) {
dirty = 1;
} else {
err = ntfs_sync_inode(inode);
if (err)
return err;
}
if (dirty)
mark_inode_dirty(inode);
/*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
return 0;
}
/*
* ntfs_fallocate
*
* Preallocate space for a file. This implements ntfs's fallocate file
* operation, which gets called from sys_fallocate system call. User
* space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
* we just allocate clusters without zeroing them out. Otherwise we
* allocate and zero out clusters via an expanding truncate.
*/
static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
{
struct inode *inode = file->f_mapping->host;
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
loff_t end = vbo + len;
loff_t vbo_down = round_down(vbo, PAGE_SIZE);
bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
loff_t i_size, new_size;
bool map_locked;
int err;
/* No support for dir. */
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
/*
* vfs_fallocate checks all possible combinations of mode.
* Do additional checks here before ntfs_set_state(dirty).
*/
if (mode & FALLOC_FL_PUNCH_HOLE) {
if (!is_supported_holes)
return -EOPNOTSUPP;
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
} else if (mode & FALLOC_FL_INSERT_RANGE) {
if (!is_supported_holes)
return -EOPNOTSUPP;
} else if (mode &
~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
mode);
return -EOPNOTSUPP;
}
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
inode_lock(inode);
i_size = inode->i_size;
new_size = max(end, i_size);
map_locked = false;
if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
/* Should never be here, see ntfs_file_open. */
err = -EOPNOTSUPP;
goto out;
}
if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
FALLOC_FL_INSERT_RANGE)) {
inode_dio_wait(inode);
filemap_invalidate_lock(mapping);
map_locked = true;
}
if (mode & FALLOC_FL_PUNCH_HOLE) {
u32 frame_size;
loff_t mask, vbo_a, end_a, tmp;
err = filemap_write_and_wait_range(mapping, vbo, LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_punch_hole(ni, vbo, len, &frame_size);
ni_unlock(ni);
if (err != E_NTFS_NOTALIGNED)
goto out;
/* Process not aligned punch. */
mask = frame_size - 1;
vbo_a = (vbo + mask) & ~mask;
end_a = end & ~mask;
tmp = min(vbo_a, end);
if (tmp > vbo) {
err = ntfs_zero_range(inode, vbo, tmp);
if (err)
goto out;
}
if (vbo < end_a && end_a < end) {
err = ntfs_zero_range(inode, end_a, end);
if (err)
goto out;
}
/* Aligned punch_hole */
if (end_a > vbo_a) {
ni_lock(ni);
err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
ni_unlock(ni);
}
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
/*
* Write tail of the last page before removed range since
* it will get removed from the page cache below.
*/
err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
if (err)
goto out;
/*
* Write data that will be shifted to preserve them
* when discarding page cache below.
*/
err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_collapse_range(ni, vbo, len);
ni_unlock(ni);
} else if (mode & FALLOC_FL_INSERT_RANGE) {
/* Check new size. */
err = inode_newsize_ok(inode, new_size);
if (err)
goto out;
/* Write out all dirty pages. */
err = filemap_write_and_wait_range(mapping, vbo_down,
LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_insert_range(ni, vbo, len);
ni_unlock(ni);
} else {
/* Check new size. */
/* generic/213: expected -ENOSPC instead of -EFBIG. */
if (!is_supported_holes) {
loff_t to_alloc = new_size - inode_get_bytes(inode);
if (to_alloc > 0 &&
(to_alloc >> sbi->cluster_bits) >
wnd_zeroes(&sbi->used.bitmap)) {
err = -ENOSPC;
goto out;
}
}
err = inode_newsize_ok(inode, new_size);
if (err)
goto out;
/*
* Allocate clusters, do not change 'valid' size.
*/
err = ntfs_set_size(inode, new_size);
if (err)
goto out;
if (is_supported_holes) {
CLST vcn_v = bytes_to_cluster(sbi, ni->i_valid);
CLST vcn = vbo >> sbi->cluster_bits;
CLST cend = bytes_to_cluster(sbi, end);
CLST lcn, clen;
bool new;
/*
* Allocate but do not zero new clusters. (see below comments)
* This breaks security: One can read unused on-disk areas.
* Zeroing these clusters may be too long.
* Maybe we should check here for root rights?
*/
for (; vcn < cend; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend - vcn,
&lcn, &clen, &new);
if (err)
goto out;
if (!new || vcn >= vcn_v)
continue;
/*
* Unwritten area.
* NTFS is not able to store several unwritten areas.
* Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
*
* Dangerous in case:
* 1G of sparsed clusters + 1 cluster of data =>
* valid_size == 1G + 1 cluster
* fallocate(1G) will zero 1G and this can be very long
* xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
*/
ntfs_sparse_cluster(inode, NULL, vcn,
min(vcn_v - vcn, clen));
}
}
if (mode & FALLOC_FL_KEEP_SIZE) {
ni_lock(ni);
/* True - Keep preallocated. */
err = attr_set_size(ni, ATTR_DATA, NULL, 0,
&ni->file.run, i_size, &ni->i_valid,
true, NULL);
ni_unlock(ni);
}
}
out:
if (map_locked)
filemap_invalidate_unlock(mapping);
if (!err) {
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
}
inode_unlock(inode);
return err;
}
/*
* ntfs3_setattr - inode_operations::setattr
*/
int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *attr)
{
struct super_block *sb = dentry->d_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct inode *inode = d_inode(dentry);
struct ntfs_inode *ni = ntfs_i(inode);
u32 ia_valid = attr->ia_valid;
umode_t mode = inode->i_mode;
int err;
if (sbi->options->noacsrules) {
/* "No access rules" - Force any changes of time etc. */
attr->ia_valid |= ATTR_FORCE;
/* and disable for editing some attributes. */
attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
ia_valid = attr->ia_valid;
}
err = setattr_prepare(mnt_userns, dentry, attr);
if (err)
goto out;
if (ia_valid & ATTR_SIZE) {
loff_t oldsize = inode->i_size;
if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
/* Should never be here, see ntfs_file_open(). */
err = -EOPNOTSUPP;
goto out;
}
inode_dio_wait(inode);
if (attr->ia_size <= oldsize)
err = ntfs_truncate(inode, attr->ia_size);
else if (attr->ia_size > oldsize)
err = ntfs_extend(inode, attr->ia_size, 0, NULL);
if (err)
goto out;
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
}
setattr_copy(mnt_userns, inode, attr);
if (mode != inode->i_mode) {
err = ntfs_acl_chmod(mnt_userns, inode);
if (err)
goto out;
/* Linux 'w' -> Windows 'ro'. */
if (0222 & inode->i_mode)
ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
else
ni->std_fa |= FILE_ATTRIBUTE_READONLY;
}
if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
ntfs_save_wsl_perm(inode);
mark_inode_dirty(inode);
out:
return err;
}
static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
if (is_encrypted(ni)) {
ntfs_inode_warn(inode, "encrypted i/o not supported");
return -EOPNOTSUPP;
}
if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
ntfs_inode_warn(inode, "direct i/o + compressed not supported");
return -EOPNOTSUPP;
}
#ifndef CONFIG_NTFS3_LZX_XPRESS
if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
ntfs_inode_warn(
inode,
"activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
return -EOPNOTSUPP;
}
#endif
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "read deduplicated not supported");
return -EOPNOTSUPP;
}
return generic_file_read_iter(iocb, iter);
}
/*
* ntfs_get_frame_pages
*
* Return: Array of locked pages.
*/
static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
struct page **pages, u32 pages_per_frame,
bool *frame_uptodate)
{
gfp_t gfp_mask = mapping_gfp_mask(mapping);
u32 npages;
*frame_uptodate = true;
for (npages = 0; npages < pages_per_frame; npages++, index++) {
struct page *page;
page = find_or_create_page(mapping, index, gfp_mask);
if (!page) {
while (npages--) {
page = pages[npages];
unlock_page(page);
put_page(page);
}
return -ENOMEM;
}
if (!PageUptodate(page))
*frame_uptodate = false;
pages[npages] = page;
}
return 0;
}
/*
* ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
*/
static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
{
int err;
struct file *file = iocb->ki_filp;
size_t count = iov_iter_count(from);
loff_t pos = iocb->ki_pos;
struct inode *inode = file_inode(file);
loff_t i_size = inode->i_size;
struct address_space *mapping = inode->i_mapping;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid = ni->i_valid;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct page *page, **pages = NULL;
size_t written = 0;
u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
u32 frame_size = 1u << frame_bits;
u32 pages_per_frame = frame_size >> PAGE_SHIFT;
u32 ip, off;
CLST frame;
u64 frame_vbo;
pgoff_t index;
bool frame_uptodate;
if (frame_size < PAGE_SIZE) {
/*
* frame_size == 8K if cluster 512
* frame_size == 64K if cluster 4096
*/
ntfs_inode_warn(inode, "page size is bigger than frame size");
return -EOPNOTSUPP;
}
pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
if (!pages)
return -ENOMEM;
current->backing_dev_info = inode_to_bdi(inode);
err = file_remove_privs(file);
if (err)
goto out;
err = file_update_time(file);
if (err)
goto out;
/* Zero range [valid : pos). */
while (valid < pos) {
CLST lcn, clen;
frame = valid >> frame_bits;
frame_vbo = valid & ~(frame_size - 1);
off = valid & (frame_size - 1);
err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
&clen, NULL);
if (err)
goto out;
if (lcn == SPARSE_LCN) {
ni->i_valid = valid =
frame_vbo + ((u64)clen << sbi->cluster_bits);
continue;
}
/* Load full frame. */
err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
pages, pages_per_frame,
&frame_uptodate);
if (err)
goto out;
if (!frame_uptodate && off) {
err = ni_read_frame(ni, frame_vbo, pages,
pages_per_frame);
if (err) {
for (ip = 0; ip < pages_per_frame; ip++) {
page = pages[ip];
unlock_page(page);
put_page(page);
}
goto out;
}
}
ip = off >> PAGE_SHIFT;
off = offset_in_page(valid);
for (; ip < pages_per_frame; ip++, off = 0) {
page = pages[ip];
zero_user_segment(page, off, PAGE_SIZE);
flush_dcache_page(page);
SetPageUptodate(page);
}
ni_lock(ni);
err = ni_write_frame(ni, pages, pages_per_frame);
ni_unlock(ni);
for (ip = 0; ip < pages_per_frame; ip++) {
page = pages[ip];
SetPageUptodate(page);
unlock_page(page);
put_page(page);
}
if (err)
goto out;
ni->i_valid = valid = frame_vbo + frame_size;
}
/* Copy user data [pos : pos + count). */
while (count) {
size_t copied, bytes;
off = pos & (frame_size - 1);
bytes = frame_size - off;
if (bytes > count)
bytes = count;
frame_vbo = pos & ~(frame_size - 1);
index = frame_vbo >> PAGE_SHIFT;
if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
err = -EFAULT;
goto out;
}