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file.c
1169 lines (970 loc) · 25.9 KB
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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/buffer_head.h>
#include <linux/compat.h>
#include <linux/falloc.h>
#include <linux/fiemap.h>
#include <linux/msdos_fs.h> /* FAT_IOCTL_XXX */
#include <linux/nls.h>
#include <linux/uio.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;
struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
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, q->limits.discard_granularity);
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;
u32 __user *user_attr = (u32 __user *)arg;
switch (cmd) {
case FAT_IOCTL_GET_ATTRIBUTES:
return put_user(le32_to_cpu(ntfs_i(inode)->std_fa), user_attr);
case FAT_IOCTL_GET_VOLUME_ID:
return put_user(sbi->volume.ser_num, user_attr);
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
/*
* inode_operations::getattr
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
struct kstat *stat, u32 request_mask, u32 flags)
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
int ntfs_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, u32 flags)
#else
int ntfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
#endif
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
struct inode *inode = d_inode(path->dentry);
struct ntfs_inode *ni = ntfs_i(inode);
#else
struct inode *inode = d_inode(dentry);
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
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;
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
generic_fillattr(mnt_userns, inode, stat);
#else
generic_fillattr(inode, stat);
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
stat->result_mask |= STATX_BTIME;
stat->btime = ni->i_crtime;
#endif
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;
void *fsdata;
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) {
loff_t vbo = (loff_t)vcn << bits;
loff_t to = vbo + ((loff_t)clen << bits);
if (to <= new_valid) {
ni->i_valid = to;
pos = to;
goto next;
}
if (vbo < pos) {
pos = vbo;
} else {
to = (new_valid >> bits) << bits;
if (pos < to) {
ni->i_valid = to;
pos = to;
goto next;
}
}
}
}
zerofrom = pos & (PAGE_SIZE - 1);
len = PAGE_SIZE - zerofrom;
if (pos + len > new_valid)
len = new_valid - pos;
err = pagecache_write_begin(file, mapping, pos, len, 0, &page,
&fsdata);
if (err)
goto out;
zero_user_segment(page, zerofrom, PAGE_SIZE);
/* this function in any case puts page*/
err = pagecache_write_end(file, mapping, pos, len, len, page,
fsdata);
if (err < 0)
goto out;
pos += len;
next:
if (pos >= new_valid)
break;
balance_dirty_pages_ratelimited(mapping);
cond_resched();
}
mark_inode_dirty(inode);
return 0;
out:
ni->i_valid = valid;
ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
new_valid);
return err;
}
/*
* ntfs_sparse_cluster
*
* Helper function to zero a new allocated clusters
*/
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;
u64 vbo = (u64)vcn << sbi->cluster_bits;
u64 bytes = (u64)len << sbi->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)) {
ntfs_inode_err(
inode,
"failed to allocate page buffers.");
/*err = -ENOMEM;*/
goto unlock_page;
}
}
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) {
if (!PageUptodate(page))
SetPageUptodate(page);
set_page_dirty(page);
}
unlock_page:
if (idx != idx0) {
unlock_page(page);
put_page(page);
}
cond_resched();
}
mark_inode_dirty(inode);
}
/*
* 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 to, 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 is not supported for encrypted files");
err = -EOPNOTSUPP;
goto out;
}
if (!rw)
goto do_map;
if (is_compressed(ni)) {
ntfs_inode_warn(
inode,
"mmap(write) is not supported for compressed files");
err = -EOPNOTSUPP;
goto out;
}
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 vcn, lcn, len;
CLST end = bytes_to_cluster(sbi, to);
bool new;
for (vcn = from >> sbi->cluster_bits; 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) {
inode_lock(inode);
err = ntfs_extend_initialized_size(file, ni, ni->i_valid, to);
inode_unlock(inode);
if (err)
goto out;
}
do_map:
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, true, 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;
}
/*
* 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 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);
loff_t i_size;
int err;
/* No support for dir */
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
/* Return error if mode is not supported */
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
FALLOC_FL_COLLAPSE_RANGE))
return -EOPNOTSUPP;
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
inode_lock(inode);
i_size = 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;
}
if (mode & FALLOC_FL_PUNCH_HOLE) {
if (!(mode & FALLOC_FL_KEEP_SIZE)) {
err = -EINVAL;
goto out;
}
if (!is_sparsed(ni) && !is_compressed(ni)) {
ntfs_inode_warn(
inode,
"punch_hole only for sparsed/compressed files");
err = -EOPNOTSUPP;
goto out;
}
err = filemap_write_and_wait_range(inode->i_mapping, vbo,
end - 1);
if (err)
goto out;
err = filemap_write_and_wait_range(inode->i_mapping, end,
LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_punch_hole(ni, vbo, len);
ni_unlock(ni);
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
err = -EINVAL;
goto out;
}
/*
* 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(inode->i_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(inode->i_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 {
/*
* normal file: allocate clusters, do not change 'valid' size
*/
err = ntfs_set_size(inode, max(end, i_size));
if (err)
goto out;
if (is_sparsed(ni) || is_compressed(ni)) {
CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
CLST vcn = vbo >> sbi->cluster_bits;
CLST cend = bytes_to_cluster(sbi, end);
CLST lcn, clen;
bool new;
/*
* allocate but not zero new clusters (see below comments)
* this breaks security (one can read unused on-disk areas)
* zeroing these clusters may be too long
* may be 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);
}
}
if (!err) {
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
}
out:
if (err == -EFBIG)
err = -ENOSPC;
inode_unlock(inode);
return err;
}
/*
* inode_operations::setattr
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
#else
int ntfs3_setattr(struct dentry *dentry,
#endif
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.no_acs_rules) {
/* "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;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = setattr_prepare(mnt_userns, dentry, attr);
#else
err = setattr_prepare(dentry, attr);
#endif
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;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
setattr_copy(mnt_userns, inode, attr);
#else
setattr_copy(inode, attr);
#endif
if (mode != inode->i_mode) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
err = ntfs_acl_chmod(mnt_userns, inode);
#else
err = ntfs_acl_chmod(inode);
#endif
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;
}
mark_inode_dirty(inode);
out:
return err;
}
static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
ssize_t err;
size_t count = iov_iter_count(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;
}
err = count ? generic_file_read_iter(iocb, iter) : 0;
return err;
}
/* returns 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;
}
/*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 = ntfs_malloc(pages_per_frame * sizeof(struct page *));
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 = pos >> frame_bits;
frame_vbo = pos & ~(frame_size - 1);
index = frame_vbo >> PAGE_SHIFT;
if (unlikely(iov_iter_fault_in_readable(from, bytes))) {
err = -EFAULT;
goto out;
}
/* Load full frame */
err = ntfs_get_frame_pages(mapping, index, pages,
pages_per_frame, &frame_uptodate);
if (err)
goto out;
if (!frame_uptodate) {
loff_t to = pos + bytes;
if (off || (to < i_size && (to & (frame_size - 1)))) {
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;
}
}
}
WARN_ON(!bytes);
copied = 0;
ip = off >> PAGE_SHIFT;
off = offset_in_page(pos);
/* copy user data to pages */
for (;;) {
size_t cp, tail = PAGE_SIZE - off;
page = pages[ip];
cp = iov_iter_copy_from_user_atomic(page, from, off,
min(tail, bytes));
flush_dcache_page(page);
iov_iter_advance(from, cp);
copied += cp;
bytes -= cp;
if (!bytes || !cp)
break;
if (cp < tail) {
off += cp;
} else {
ip++;
off = 0;
}
}
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];
ClearPageDirty(page);
SetPageUptodate(page);
unlock_page(page);
put_page(page);
}
if (err)
goto out;
/*
* We can loop for a long time in here. Be nice and allow
* us to schedule out to avoid softlocking if preempt
* is disabled.
*/
cond_resched();
pos += copied;
written += copied;
count = iov_iter_count(from);
}
out:
ntfs_free(pages);
current->backing_dev_info = NULL;
if (err < 0)