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linux-stable/fs/ntfs3/file.c
Linus Torvalds 05e6295f7b fs.idmapped.v6.3 
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Merge tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping

Pull vfs idmapping updates from Christian Brauner:

 - Last cycle we introduced the dedicated struct mnt_idmap type for
   mount idmapping and the required infrastucture in 256c8aed2b ("fs:
   introduce dedicated idmap type for mounts"). As promised in last
   cycle's pull request message this converts everything to rely on
   struct mnt_idmap.

   Currently we still pass around the plain namespace that was attached
   to a mount. This is in general pretty convenient but it makes it easy
   to conflate namespaces that are relevant on the filesystem with
   namespaces that are relevant on the mount level. Especially for
   non-vfs developers without detailed knowledge in this area this was a
   potential source for bugs.

   This finishes the conversion. Instead of passing the plain namespace
   around this updates all places that currently take a pointer to a
   mnt_userns with a pointer to struct mnt_idmap.

   Now that the conversion is done all helpers down to the really
   low-level helpers only accept a struct mnt_idmap argument instead of
   two namespace arguments.

   Conflating mount and other idmappings will now cause the compiler to
   complain loudly thus eliminating the possibility of any bugs. This
   makes it impossible for filesystem developers to mix up mount and
   filesystem idmappings as they are two distinct types and require
   distinct helpers that cannot be used interchangeably.

   Everything associated with struct mnt_idmap is moved into a single
   separate file. With that change no code can poke around in struct
   mnt_idmap. It can only be interacted with through dedicated helpers.
   That means all filesystems are and all of the vfs is completely
   oblivious to the actual implementation of idmappings.

   We are now also able to extend struct mnt_idmap as we see fit. For
   example, we can decouple it completely from namespaces for users that
   don't require or don't want to use them at all. We can also extend
   the concept of idmappings so we can cover filesystem specific
   requirements.

   In combination with the vfs{g,u}id_t work we finished in v6.2 this
   makes this feature substantially more robust and thus difficult to
   implement wrong by a given filesystem and also protects the vfs.

 - Enable idmapped mounts for tmpfs and fulfill a longstanding request.

   A long-standing request from users had been to make it possible to
   create idmapped mounts for tmpfs. For example, to share the host's
   tmpfs mount between multiple sandboxes. This is a prerequisite for
   some advanced Kubernetes cases. Systemd also has a range of use-cases
   to increase service isolation. And there are more users of this.

   However, with all of the other work going on this was way down on the
   priority list but luckily someone other than ourselves picked this
   up.

   As usual the patch is tiny as all the infrastructure work had been
   done multiple kernel releases ago. In addition to all the tests that
   we already have I requested that Rodrigo add a dedicated tmpfs
   testsuite for idmapped mounts to xfstests. It is to be included into
   xfstests during the v6.3 development cycle. This should add a slew of
   additional tests.

* tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping: (26 commits)
  shmem: support idmapped mounts for tmpfs
  fs: move mnt_idmap
  fs: port vfs{g,u}id helpers to mnt_idmap
  fs: port fs{g,u}id helpers to mnt_idmap
  fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap
  fs: port i_{g,u}id_{needs_}update() to mnt_idmap
  quota: port to mnt_idmap
  fs: port privilege checking helpers to mnt_idmap
  fs: port inode_owner_or_capable() to mnt_idmap
  fs: port inode_init_owner() to mnt_idmap
  fs: port acl to mnt_idmap
  fs: port xattr to mnt_idmap
  fs: port ->permission() to pass mnt_idmap
  fs: port ->fileattr_set() to pass mnt_idmap
  fs: port ->set_acl() to pass mnt_idmap
  fs: port ->get_acl() to pass mnt_idmap
  fs: port ->tmpfile() to pass mnt_idmap
  fs: port ->rename() to pass mnt_idmap
  fs: port ->mknod() to pass mnt_idmap
  fs: port ->mkdir() to pass mnt_idmap
  ...
2023-02-20 11:53:11 -08:00

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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 mnt_idmap *idmap, 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(idmap, 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, 1, &lcn, &clen, NULL,
false);
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 from = 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, to;
sector_t iblock;
struct page *page;
for (; idx < idx_end; idx += 1, from = 0) {
page_off = (loff_t)idx << PAGE_SHIFT;
to = (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 <= from || bh_off >= to)
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, from, to);
unlock_page(page);
put_page(page);
cond_resched();
}
out:
mark_inode_dirty(inode);
return err;
}
/*
* 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, true);
if (err)
goto out;
}
}
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;
}
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));
truncate_setsize(inode, new_size);
ni_lock(ni);
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, max_t(unsigned long,
sbi->cluster_size, 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_down,
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;
if (new_size > i_size) {
/*
* Allocate clusters, do not change 'valid' size.
*/
err = ntfs_set_size(inode, new_size);
if (err)
goto out;
}
if (is_supported_holes) {
CLST vcn = vbo >> sbi->cluster_bits;
CLST cend = bytes_to_cluster(sbi, end);
CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
CLST lcn, clen;
bool new;
if (cend_v > cend)
cend_v = cend;
/*
* Allocate and zero new clusters.
* Zeroing these clusters may be too long.
*/
for (; vcn < cend_v; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend_v - vcn,
&lcn, &clen, &new,
true);
if (err)
goto out;
}
/*
* Allocate but not zero new clusters.
*/
for (; vcn < cend; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend - vcn,
&lcn, &clen, &new,
false);
if (err)
goto out;
}
}
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);
} else if (new_size > i_size) {
inode->i_size = new_size;
}
}
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 mnt_idmap *idmap, 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(idmap, dentry, attr);
if (err)
goto out;
if (ia_valid & ATTR_SIZE) {
loff_t newsize, oldsize;
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);
oldsize = inode->i_size;
newsize = attr->ia_size;
if (newsize <= oldsize)
err = ntfs_truncate(inode, newsize);
else
err = ntfs_extend(inode, newsize, 0, NULL);
if (err)
goto out;
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
inode->i_size = newsize;
}
setattr_copy(idmap, inode, attr);
if (mode != inode->i_mode) {
err = ntfs_acl_chmod(idmap, dentry);
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, 1, &lcn,
&clen, NULL, false);
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;
}
/* 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 = copy_page_from_iter_atomic(page, off,
min(tail, bytes), from);
flush_dcache_page(page);
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:
kfree(pages);
current->backing_dev_info = NULL;
if (err < 0)
return err;
iocb->ki_pos += written;
if (iocb->ki_pos > ni->i_valid)
ni->i_valid = iocb->ki_pos;
return written;
}
/*
* ntfs_file_write_iter - file_operations::write_iter
*/
static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t ret;
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;
}
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "write into deduplicated not supported");
return -EOPNOTSUPP;
}
if (!inode_trylock(inode)) {
if (iocb->ki_flags & IOCB_NOWAIT)
return -EAGAIN;
inode_lock(inode);
}
ret = generic_write_checks(iocb, from);
if (ret <= 0)
goto out;
if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
/* Should never be here, see ntfs_file_open(). */
ret = -EOPNOTSUPP;
goto out;
}
ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
if (ret)
goto out;
ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
: __generic_file_write_iter(iocb, from);
out:
inode_unlock(inode);
if (ret > 0)
ret = generic_write_sync(iocb, ret);
return ret;
}
/*
* ntfs_file_open - file_operations::open
*/
int ntfs_file_open(struct inode *inode, struct file *file)
{
struct ntfs_inode *ni = ntfs_i(inode);
if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
(file->f_flags & O_DIRECT))) {
return -EOPNOTSUPP;
}
/* Decompress "external compressed" file if opened for rw. */
if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
(file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
#ifdef CONFIG_NTFS3_LZX_XPRESS
int err = ni_decompress_file(ni);
if (err)
return err;
#else
ntfs_inode_warn(
inode,
"activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
return -EOPNOTSUPP;
#endif
}
return generic_file_open(inode, file);
}
/*
* ntfs_file_release - file_operations::release
*/
static int ntfs_file_release(struct inode *inode, struct file *file)
{
struct ntfs_inode *ni = ntfs_i(inode);
struct ntfs_sb_info *sbi = ni->mi.sbi;
int err = 0;
/* If we are last writer on the inode, drop the block reservation. */
if (sbi->options->prealloc && ((file->f_mode & FMODE_WRITE) &&
atomic_read(&inode->i_writecount) == 1)) {
ni_lock(ni);
down_write(&ni->file.run_lock);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
inode->i_size, &ni->i_valid, false, NULL);
up_write(&ni->file.run_lock);
ni_unlock(ni);
}
return err;
}
/*
* ntfs_fiemap - file_operations::fiemap
*/
int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
{
int err;
struct ntfs_inode *ni = ntfs_i(inode);
err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
if (err)
return err;
ni_lock(ni);
err = ni_fiemap(ni, fieinfo, start, len);
ni_unlock(ni);
return err;
}
// clang-format off
const struct inode_operations ntfs_file_inode_operations = {
.getattr = ntfs_getattr,
.setattr = ntfs3_setattr,
.listxattr = ntfs_listxattr,
.permission = ntfs_permission,
.get_inode_acl = ntfs_get_acl,
.set_acl = ntfs_set_acl,
.fiemap = ntfs_fiemap,
};
const struct file_operations ntfs_file_operations = {
.llseek = generic_file_llseek,
.read_iter = ntfs_file_read_iter,
.write_iter = ntfs_file_write_iter,
.unlocked_ioctl = ntfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ntfs_compat_ioctl,
#endif
.splice_read = generic_file_splice_read,
.mmap = ntfs_file_mmap,
.open = ntfs_file_open,
.fsync = generic_file_fsync,
.splice_write = iter_file_splice_write,
.fallocate = ntfs_fallocate,
.release = ntfs_file_release,
};
// clang-format on
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