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-rw-r--r--fs/ntfs3/file.c1491
1 files changed, 1491 insertions, 0 deletions
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
new file mode 100644
index 000000000000..2e7b2e566ebe
--- /dev/null
+++ b/fs/ntfs3/file.c
@@ -0,0 +1,1491 @@
+// 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 <linux/fileattr.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+
+/*
+ * cifx, btrfs, exfat, ext4, f2fs use this constant.
+ * Hope this value will become common to all fs.
+ */
+#define NTFS3_IOC_SHUTDOWN _IOR('X', 125, __u32)
+
+static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
+{
+ struct fstrim_range __user *user_range;
+ struct fstrim_range range;
+ struct block_device *dev;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ dev = sbi->sb->s_bdev;
+ if (!bdev_max_discard_sectors(dev))
+ 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(dev));
+
+ 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 int ntfs_ioctl_get_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
+{
+ if (copy_to_user(buf, sbi->volume.label, FSLABEL_MAX))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int ntfs_ioctl_set_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
+{
+ u8 user[FSLABEL_MAX] = { 0 };
+ int len;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(user, buf, FSLABEL_MAX))
+ return -EFAULT;
+
+ len = strnlen(user, FSLABEL_MAX);
+
+ return ntfs_set_label(sbi, user, len);
+}
+
+/*
+ * ntfs_force_shutdown - helper function. Called from ioctl
+ */
+static int ntfs_force_shutdown(struct super_block *sb, u32 flags)
+{
+ int err;
+ struct ntfs_sb_info *sbi = sb->s_fs_info;
+
+ if (unlikely(ntfs3_forced_shutdown(sb)))
+ return 0;
+
+ /* No additional options yet (flags). */
+ err = bdev_freeze(sb->s_bdev);
+ if (err)
+ return err;
+ set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &sbi->flags);
+ bdev_thaw(sb->s_bdev);
+ return 0;
+}
+
+static int ntfs_ioctl_shutdown(struct super_block *sb, unsigned long arg)
+{
+ u32 flags;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (get_user(flags, (__u32 __user *)arg))
+ return -EFAULT;
+
+ return ntfs_force_shutdown(sb, flags);
+}
+
+/*
+ * ntfs_ioctl - file_operations::unlocked_ioctl
+ */
+long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct super_block *sb = inode->i_sb;
+ struct ntfs_sb_info *sbi = sb->s_fs_info;
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ntfs_i(inode))))
+ return -EINVAL;
+
+ switch (cmd) {
+ case FITRIM:
+ return ntfs_ioctl_fitrim(sbi, arg);
+ case FS_IOC_GETFSLABEL:
+ return ntfs_ioctl_get_volume_label(sbi, (u8 __user *)arg);
+ case FS_IOC_SETFSLABEL:
+ return ntfs_ioctl_set_volume_label(sbi, (u8 __user *)arg);
+ case NTFS3_IOC_SHUTDOWN:
+ return ntfs_ioctl_shutdown(sb, arg);
+ }
+ return -ENOTTY; /* Inappropriate ioctl for device. */
+}
+
+#ifdef CONFIG_COMPAT
+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);
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ stat->result_mask |= STATX_BTIME;
+ stat->btime = ni->i_crtime;
+ stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
+
+ if (inode->i_flags & S_IMMUTABLE)
+ stat->attributes |= STATX_ATTR_IMMUTABLE;
+
+ if (inode->i_flags & S_APPEND)
+ stat->attributes |= STATX_ATTR_APPEND;
+
+ 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 |
+ STATX_ATTR_IMMUTABLE | STATX_ATTR_APPEND;
+
+ generic_fillattr(idmap, request_mask, inode, stat);
+
+ 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 (valid >= new_valid)
+ return 0;
+
+ if (is_resident(ni)) {
+ ni->i_valid = new_valid;
+ return 0;
+ }
+
+ WARN_ON(is_compressed(ni));
+
+ for (;;) {
+ u32 zerofrom, len;
+ struct folio *folio;
+ 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(NULL, mapping, pos, len, &folio, NULL);
+ if (err)
+ goto out;
+
+ folio_zero_range(folio, zerofrom, folio_size(folio) - zerofrom);
+
+ err = ntfs_write_end(NULL, mapping, pos, len, len, folio, 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 = i_blocksize(inode);
+ 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 folio *folio;
+ bool dirty = false;
+
+ 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;
+
+ folio = __filemap_get_folio(
+ mapping, idx, FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
+ mapping_gfp_constraint(mapping, ~__GFP_FS));
+ if (IS_ERR(folio))
+ return PTR_ERR(folio);
+
+ head = folio_buffers(folio);
+ if (!head)
+ head = create_empty_buffers(folio, blocksize, 0);
+
+ bh = head;
+ 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 (folio_test_uptodate(folio))
+ set_buffer_uptodate(bh);
+ else if (bh_read(bh, 0) < 0) {
+ err = -EIO;
+ folio_unlock(folio);
+ folio_put(folio);
+ goto out;
+ }
+
+ mark_buffer_dirty(bh);
+ } while (bh_off = bh_next, iblock += 1,
+ head != (bh = bh->b_this_page));
+
+ folio_zero_segment(folio, from, to);
+ dirty = true;
+
+ folio_unlock(folio);
+ folio_put(folio);
+ cond_resched();
+ }
+out:
+ if (dirty)
+ mark_inode_dirty(inode);
+ return err;
+}
+
+/*
+ * ntfs_file_mmap_prepare - file_operations::mmap_prepare
+ */
+static int ntfs_file_mmap_prepare(struct vm_area_desc *desc)
+{
+ struct file *file = desc->file;
+ struct inode *inode = file_inode(file);
+ struct ntfs_inode *ni = ntfs_i(inode);
+ u64 from = ((u64)desc->pgoff << PAGE_SHIFT);
+ bool rw = desc->vm_flags & VM_WRITE;
+ int err;
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ 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)) {
+ if (rw) {
+ ntfs_inode_warn(inode,
+ "mmap(write) compressed not supported");
+ return -EOPNOTSUPP;
+ }
+ /* Turn off readahead for compressed files. */
+ file->f_ra.ra_pages = 0;
+ }
+
+ if (rw) {
+ u64 to = min_t(loff_t, i_size_read(inode),
+ from + vma_desc_size(desc));
+
+ 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_prepare(desc);
+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;
+ }
+
+ if (file && is_sparsed(ni)) {
+ /*
+ * This code optimizes large writes to sparse file.
+ * TODO: merge this fragment with fallocate fragment.
+ */
+ struct ntfs_sb_info *sbi = ni->mi.sbi;
+ CLST vcn = pos >> 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;
+ }
+ }
+
+ inode_set_mtime_to_ts(inode, inode_set_ctime_current(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_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
+ if (!IS_DIRSYNC(inode)) {
+ dirty = 1;
+ } else {
+ err = ntfs_sync_inode(inode);
+ if (err)
+ return err;
+ }
+
+ if (dirty)
+ mark_inode_dirty(inode);
+
+ return 0;
+}
+
+/*
+ * ntfs_fallocate - file_operations::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_inode(file);
+ 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)
+ goto ok;
+
+ if (err != E_NTFS_NOTALIGNED)
+ goto out;
+
+ /* Process not aligned punch. */
+ err = 0;
+ 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);
+ if (err)
+ goto out;
+ }
+ } 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);
+ if (err)
+ goto out;
+ } 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);
+ if (err)
+ goto out;
+ } else {
+ /* Check new size. */
+ u8 cluster_bits = sbi->cluster_bits;
+
+ /* Be sure file is non resident. */
+ if (is_resident(ni)) {
+ ni_lock(ni);
+ err = attr_force_nonresident(ni);
+ ni_unlock(ni);
+ if (err)
+ goto out;
+ }
+
+ /* 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 >> 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 >> 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);
+ if (err)
+ goto out;
+ } else if (new_size > i_size) {
+ i_size_write(inode, new_size);
+ }
+ }
+
+ok:
+ err = file_modified(file);
+ if (err)
+ goto out;
+
+out:
+ if (map_locked)
+ filemap_invalidate_unlock(mapping);
+
+ if (!err) {
+ inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
+ mark_inode_dirty(inode);
+ }
+
+ inode_unlock(inode);
+ return err;
+}
+
+/*
+ * ntfs_setattr - inode_operations::setattr
+ */
+int ntfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *attr)
+{
+ 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;
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ 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 = i_size_read(inode);
+ 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;
+ i_size_write(inode, 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, NULL);
+ mark_inode_dirty(inode);
+out:
+ return err;
+}
+
+/*
+ * check_read_restriction:
+ * common code for ntfs_file_read_iter and ntfs_file_splice_read
+ */
+static int check_read_restriction(struct inode *inode)
+{
+ struct ntfs_inode *ni = ntfs_i(inode);
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ if (is_encrypted(ni)) {
+ ntfs_inode_warn(inode, "encrypted i/o 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 0;
+}
+
+/*
+ * ntfs_file_read_iter - file_operations::read_iter
+ */
+static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ struct ntfs_inode *ni = ntfs_i(inode);
+ ssize_t err;
+
+ err = check_read_restriction(inode);
+ if (err)
+ return err;
+
+ if (is_compressed(ni)) {
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ ntfs_inode_warn(
+ inode, "direct i/o + compressed not supported");
+ return -EOPNOTSUPP;
+ }
+ /* Turn off readahead for compressed files. */
+ file->f_ra.ra_pages = 0;
+ }
+
+ /* Check minimum alignment for dio. */
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ struct super_block *sb = inode->i_sb;
+ struct ntfs_sb_info *sbi = sb->s_fs_info;
+ if ((iocb->ki_pos | iov_iter_alignment(iter)) &
+ sbi->bdev_blocksize_mask) {
+ iocb->ki_flags &= ~IOCB_DIRECT;
+ }
+ }
+
+ return generic_file_read_iter(iocb, iter);
+}
+
+/*
+ * ntfs_file_splice_read - file_operations::splice_read
+ */
+static ssize_t ntfs_file_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ struct inode *inode = file_inode(in);
+ ssize_t err;
+
+ err = check_read_restriction(inode);
+ if (err)
+ return err;
+
+ if (is_compressed(ntfs_i(inode))) {
+ /* Turn off readahead for compressed files. */
+ in->f_ra.ra_pages = 0;
+ }
+
+ return filemap_splice_read(in, ppos, pipe, len, flags);
+}
+
+/*
+ * 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 folio *folio;
+
+ folio = __filemap_get_folio(mapping, index,
+ FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
+ gfp_mask);
+ if (IS_ERR(folio)) {
+ while (npages--) {
+ folio = page_folio(pages[npages]);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+ return -ENOMEM;
+ }
+
+ if (!folio_test_uptodate(folio))
+ *frame_uptodate = false;
+
+ pages[npages] = &folio->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 = i_size_read(inode);
+ 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 **pages = NULL;
+ struct folio *folio;
+ 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;
+
+ 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, 0);
+ if (err) {
+ for (ip = 0; ip < pages_per_frame; ip++) {
+ folio = page_folio(pages[ip]);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ goto out;
+ }
+ }
+
+ ip = off >> PAGE_SHIFT;
+ off = offset_in_page(valid);
+ for (; ip < pages_per_frame; ip++, off = 0) {
+ folio = page_folio(pages[ip]);
+ folio_zero_segment(folio, off, PAGE_SIZE);
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
+ }
+
+ ni_lock(ni);
+ err = ni_write_frame(ni, pages, pages_per_frame);
+ ni_unlock(ni);
+
+ for (ip = 0; ip < pages_per_frame; ip++) {
+ folio = page_folio(pages[ip]);
+ folio_mark_uptodate(folio);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+ 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, 0);
+ if (err) {
+ for (ip = 0; ip < pages_per_frame;
+ ip++) {
+ folio = page_folio(pages[ip]);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ 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;
+
+ folio = page_folio(pages[ip]);
+ cp = copy_folio_from_iter_atomic(
+ folio, off, min(tail, bytes), from);
+ flush_dcache_folio(folio);
+
+ 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++) {
+ folio = page_folio(pages[ip]);
+ folio_clear_dirty(folio);
+ folio_mark_uptodate(folio);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+ 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);
+
+ if (err < 0)
+ return err;
+
+ iocb->ki_pos += written;
+ if (iocb->ki_pos > ni->i_valid)
+ ni->i_valid = iocb->ki_pos;
+ if (iocb->ki_pos > i_size)
+ i_size_write(inode, iocb->ki_pos);
+
+ return written;
+}
+
+/*
+ * check_write_restriction:
+ * common code for ntfs_file_write_iter and ntfs_file_splice_write
+ */
+static int check_write_restriction(struct inode *inode)
+{
+ struct ntfs_inode *ni = ntfs_i(inode);
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ if (is_encrypted(ni)) {
+ ntfs_inode_warn(inode, "encrypted i/o not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (is_dedup(ni)) {
+ ntfs_inode_warn(inode, "write into deduplicated not supported");
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+/*
+ * 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 inode *inode = file_inode(file);
+ struct ntfs_inode *ni = ntfs_i(inode);
+ ssize_t ret;
+ int err;
+
+ if (!inode_trylock(inode)) {
+ if (iocb->ki_flags & IOCB_NOWAIT)
+ return -EAGAIN;
+ inode_lock(inode);
+ }
+
+ ret = check_write_restriction(inode);
+ if (ret)
+ goto out;
+
+ if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
+ ntfs_inode_warn(inode, "direct i/o + compressed not supported");
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0)
+ goto out;
+
+ err = file_modified(iocb->ki_filp);
+ if (err) {
+ ret = err;
+ 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);
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ 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)
+ /*
+ * The only file when inode->i_fop = &ntfs_file_operations and
+ * init_rwsem(&ni->file.run_lock) is not called explicitly is MFT.
+ *
+ * Add additional check here.
+ */
+ && inode->i_ino != MFT_REC_MFT) {
+ ni_lock(ni);
+ down_write(&ni->file.run_lock);
+
+ err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
+ i_size_read(inode), &ni->i_valid, false,
+ NULL);
+
+ up_write(&ni->file.run_lock);
+ ni_unlock(ni);
+ }
+ return err;
+}
+
+/*
+ * ntfs_fiemap - inode_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);
+
+ /* Avoid any operation if inode is bad. */
+ if (unlikely(is_bad_ni(ni)))
+ return -EINVAL;
+
+ 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;
+}
+
+/*
+ * ntfs_file_splice_write - file_operations::splice_write
+ */
+static ssize_t ntfs_file_splice_write(struct pipe_inode_info *pipe,
+ struct file *file, loff_t *ppos,
+ size_t len, unsigned int flags)
+{
+ ssize_t err;
+ struct inode *inode = file_inode(file);
+
+ err = check_write_restriction(inode);
+ if (err)
+ return err;
+
+ return iter_file_splice_write(pipe, file, ppos, len, flags);
+}
+
+/*
+ * ntfs_file_fsync - file_operations::fsync
+ */
+static int ntfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ struct inode *inode = file_inode(file);
+ if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
+ return -EIO;
+
+ return generic_file_fsync(file, start, end, datasync);
+}
+
+// clang-format off
+const struct inode_operations ntfs_file_inode_operations = {
+ .getattr = ntfs_getattr,
+ .setattr = ntfs_setattr,
+ .listxattr = ntfs_listxattr,
+ .get_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 = ntfs_file_splice_read,
+ .splice_write = ntfs_file_splice_write,
+ .mmap_prepare = ntfs_file_mmap_prepare,
+ .open = ntfs_file_open,
+ .fsync = ntfs_file_fsync,
+ .fallocate = ntfs_fallocate,
+ .release = ntfs_file_release,
+};
+
+#if IS_ENABLED(CONFIG_NTFS_FS)
+const struct file_operations ntfs_legacy_file_operations = {
+ .llseek = generic_file_llseek,
+ .read_iter = ntfs_file_read_iter,
+ .splice_read = ntfs_file_splice_read,
+ .open = ntfs_file_open,
+ .release = ntfs_file_release,
+};
+#endif
+// clang-format on
generated by cgit (git 2.34.1) at 2025-12-24 20:32:21 +0000