1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
6 * regular file handling primitives for ntfs-based filesystems
8 #include <linux/backing-dev.h>
9 #include <linux/buffer_head.h>
10 #include <linux/compat.h>
11 #include <linux/falloc.h>
12 #include <linux/fiemap.h>
13 #include <linux/msdos_fs.h> /* FAT_IOCTL_XXX */
14 #include <linux/nls.h>
20 static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
22 struct fstrim_range __user *user_range;
23 struct fstrim_range range;
24 struct request_queue *q = bdev_get_queue(sbi->sb->s_bdev);
27 if (!capable(CAP_SYS_ADMIN))
30 if (!blk_queue_discard(q))
33 user_range = (struct fstrim_range __user *)arg;
34 if (copy_from_user(&range, user_range, sizeof(range)))
37 range.minlen = max_t(u32, range.minlen, q->limits.discard_granularity);
39 err = ntfs_trim_fs(sbi, &range);
43 if (copy_to_user(user_range, &range, sizeof(range)))
49 static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
51 struct inode *inode = file_inode(filp);
52 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
53 u32 __user *user_attr = (u32 __user *)arg;
56 case FAT_IOCTL_GET_ATTRIBUTES:
57 return put_user(le32_to_cpu(ntfs_i(inode)->std_fa), user_attr);
59 case FAT_IOCTL_GET_VOLUME_ID:
60 return put_user(sbi->volume.ser_num, user_attr);
63 return ntfs_ioctl_fitrim(sbi, arg);
65 return -ENOTTY; /* Inappropriate ioctl for device */
69 static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
72 return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
77 * inode_operations::getattr
79 int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
80 struct kstat *stat, u32 request_mask, u32 flags)
82 struct inode *inode = d_inode(path->dentry);
83 struct ntfs_inode *ni = ntfs_i(inode);
85 if (is_compressed(ni))
86 stat->attributes |= STATX_ATTR_COMPRESSED;
89 stat->attributes |= STATX_ATTR_ENCRYPTED;
91 stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
93 generic_fillattr(mnt_userns, inode, stat);
95 stat->result_mask |= STATX_BTIME;
96 stat->btime = ni->i_crtime;
97 stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
102 static int ntfs_extend_initialized_size(struct file *file,
103 struct ntfs_inode *ni,
105 const loff_t new_valid)
107 struct inode *inode = &ni->vfs_inode;
108 struct address_space *mapping = inode->i_mapping;
109 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
113 if (is_resident(ni)) {
114 ni->i_valid = new_valid;
118 WARN_ON(is_compressed(ni));
119 WARN_ON(valid >= new_valid);
128 if (is_sparsed(ni)) {
129 bits = sbi->cluster_bits;
132 err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
137 if (lcn == SPARSE_LCN) {
138 loff_t vbo = (loff_t)vcn << bits;
139 loff_t to = vbo + ((loff_t)clen << bits);
141 if (to <= new_valid) {
150 to = (new_valid >> bits) << bits;
160 zerofrom = pos & (PAGE_SIZE - 1);
161 len = PAGE_SIZE - zerofrom;
163 if (pos + len > new_valid)
164 len = new_valid - pos;
166 err = pagecache_write_begin(file, mapping, pos, len, 0, &page,
171 zero_user_segment(page, zerofrom, PAGE_SIZE);
173 /* this function in any case puts page*/
174 err = pagecache_write_end(file, mapping, pos, len, len, page,
181 if (pos >= new_valid)
184 balance_dirty_pages_ratelimited(mapping);
192 ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
200 * Helper function for punch_hole.
201 * It zeroes a range [vbo, vbo_to)
203 static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
206 struct address_space *mapping = inode->i_mapping;
207 u32 blocksize = 1 << inode->i_blkbits;
208 pgoff_t idx = vbo >> PAGE_SHIFT;
209 u32 z_start = vbo & (PAGE_SIZE - 1);
210 pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
212 struct buffer_head *head, *bh;
213 u32 bh_next, bh_off, z_end;
217 for (; idx < idx_end; idx += 1, z_start = 0) {
218 page_off = (loff_t)idx << PAGE_SHIFT;
219 z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
221 iblock = page_off >> inode->i_blkbits;
223 page = find_or_create_page(mapping, idx,
224 mapping_gfp_constraint(mapping,
229 if (!page_has_buffers(page))
230 create_empty_buffers(page, blocksize, 0);
232 bh = head = page_buffers(page);
235 bh_next = bh_off + blocksize;
237 if (bh_next <= z_start || bh_off >= z_end)
240 if (!buffer_mapped(bh)) {
241 ntfs_get_block(inode, iblock, bh, 0);
242 /* unmapped? It's a hole - nothing to do */
243 if (!buffer_mapped(bh))
247 /* Ok, it's mapped. Make sure it's up-to-date */
248 if (PageUptodate(page))
249 set_buffer_uptodate(bh);
251 if (!buffer_uptodate(bh)) {
253 bh->b_end_io = end_buffer_read_sync;
255 submit_bh(REQ_OP_READ, 0, bh);
258 if (!buffer_uptodate(bh)) {
266 mark_buffer_dirty(bh);
268 } while (bh_off = bh_next, iblock += 1,
269 head != (bh = bh->b_this_page));
271 zero_user_segment(page, z_start, z_end);
278 mark_inode_dirty(inode);
283 * ntfs_sparse_cluster
285 * Helper function to zero a new allocated clusters
286 * NOTE: 512 <= cluster size <= 2M
288 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
291 struct address_space *mapping = inode->i_mapping;
292 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
293 u64 vbo = (u64)vcn << sbi->cluster_bits;
294 u64 bytes = (u64)len << sbi->cluster_bits;
295 u32 blocksize = 1 << inode->i_blkbits;
296 pgoff_t idx0 = page0 ? page0->index : -1;
297 loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
298 loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
299 pgoff_t idx = vbo_clst >> PAGE_SHIFT;
300 u32 from = vbo_clst & (PAGE_SIZE - 1);
301 pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
307 for (; idx < idx_end; idx += 1, from = 0) {
308 page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
313 page_off = (loff_t)idx << PAGE_SHIFT;
314 to = (page_off + PAGE_SIZE) > end ? (end - page_off)
318 if ((from || PAGE_SIZE != to) &&
319 likely(!page_has_buffers(page))) {
320 create_empty_buffers(page, blocksize, 0);
323 if (page_has_buffers(page)) {
324 struct buffer_head *head, *bh;
327 bh = head = page_buffers(page);
329 u32 bh_next = bh_off + blocksize;
331 if (from <= bh_off && bh_next <= to) {
332 set_buffer_uptodate(bh);
333 mark_buffer_dirty(bh);
334 } else if (!buffer_uptodate(bh)) {
338 } while (head != (bh = bh->b_this_page));
341 zero_user_segment(page, from, to);
344 if (!PageUptodate(page))
345 SetPageUptodate(page);
346 set_page_dirty(page);
355 mark_inode_dirty(inode);
359 * file_operations::mmap
361 static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
363 struct address_space *mapping = file->f_mapping;
364 struct inode *inode = mapping->host;
365 struct ntfs_inode *ni = ntfs_i(inode);
366 u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
367 bool rw = vma->vm_flags & VM_WRITE;
370 if (is_encrypted(ni)) {
371 ntfs_inode_warn(inode, "mmap encrypted not supported");
376 ntfs_inode_warn(inode, "mmap deduplicated not supported");
380 if (is_compressed(ni) && rw) {
381 ntfs_inode_warn(inode, "mmap(write) compressed not supported");
386 u64 to = min_t(loff_t, i_size_read(inode),
387 from + vma->vm_end - vma->vm_start);
389 if (is_sparsed(ni)) {
390 /* allocate clusters for rw map */
391 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
393 CLST vcn = from >> sbi->cluster_bits;
394 CLST end = bytes_to_cluster(sbi, to);
397 for (; vcn < end; vcn += len) {
398 err = attr_data_get_block(ni, vcn, 1, &lcn,
405 ntfs_sparse_cluster(inode, NULL, vcn, 1);
409 if (ni->i_valid < to) {
410 if (!inode_trylock(inode)) {
414 err = ntfs_extend_initialized_size(file, ni,
422 err = generic_file_mmap(file, vma);
427 static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
430 struct ntfs_inode *ni = ntfs_i(inode);
431 struct address_space *mapping = inode->i_mapping;
432 loff_t end = pos + count;
433 bool extend_init = file && pos > ni->i_valid;
436 if (end <= inode->i_size && !extend_init)
439 /*mark rw ntfs as dirty. it will be cleared at umount*/
440 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
442 if (end > inode->i_size) {
443 err = ntfs_set_size(inode, end);
449 if (extend_init && !is_compressed(ni)) {
450 err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
457 inode->i_ctime = inode->i_mtime = current_time(inode);
458 mark_inode_dirty(inode);
460 if (IS_SYNC(inode)) {
463 err = filemap_fdatawrite_range(mapping, pos, end - 1);
464 err2 = sync_mapping_buffers(mapping);
467 err2 = write_inode_now(inode, 1);
471 err = filemap_fdatawait_range(mapping, pos, end - 1);
478 static int ntfs_truncate(struct inode *inode, loff_t new_size)
480 struct super_block *sb = inode->i_sb;
481 struct ntfs_inode *ni = ntfs_i(inode);
485 if (!S_ISREG(inode->i_mode))
488 if (is_compressed(ni)) {
489 if (ni->i_valid > new_size)
490 ni->i_valid = new_size;
492 err = block_truncate_page(inode->i_mapping, new_size,
498 new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
502 truncate_setsize(inode, new_size);
504 down_write(&ni->file.run_lock);
505 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
506 &new_valid, true, NULL);
507 up_write(&ni->file.run_lock);
509 if (new_valid < ni->i_valid)
510 ni->i_valid = new_valid;
514 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
515 inode->i_ctime = inode->i_mtime = current_time(inode);
516 if (!IS_DIRSYNC(inode)) {
519 err = ntfs_sync_inode(inode);
525 mark_inode_dirty(inode);
527 /*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
533 * Preallocate space for a file. This implements ntfs's fallocate file
534 * operation, which gets called from sys_fallocate system call. User
535 * space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
536 * we just allocate clusters without zeroing them out. Otherwise we
537 * allocate and zero out clusters via an expanding truncate.
539 static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
541 struct inode *inode = file->f_mapping->host;
542 struct super_block *sb = inode->i_sb;
543 struct ntfs_sb_info *sbi = sb->s_fs_info;
544 struct ntfs_inode *ni = ntfs_i(inode);
545 loff_t end = vbo + len;
546 loff_t vbo_down = round_down(vbo, PAGE_SIZE);
550 /* No support for dir */
551 if (!S_ISREG(inode->i_mode))
554 /* Return error if mode is not supported */
555 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
556 FALLOC_FL_COLLAPSE_RANGE)) {
557 ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
562 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
565 i_size = inode->i_size;
567 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
568 /* should never be here, see ntfs_file_open*/
573 if (mode & FALLOC_FL_PUNCH_HOLE) {
575 loff_t mask, vbo_a, end_a, tmp;
577 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
582 err = filemap_write_and_wait_range(inode->i_mapping, vbo,
587 err = filemap_write_and_wait_range(inode->i_mapping, end,
592 inode_dio_wait(inode);
594 truncate_pagecache(inode, vbo_down);
596 if (!is_sparsed(ni) && !is_compressed(ni)) {
598 err = ntfs_zero_range(inode, vbo, end);
603 err = attr_punch_hole(ni, vbo, len, &frame_size);
605 if (err != E_NTFS_NOTALIGNED)
608 /* process not aligned punch */
609 mask = frame_size - 1;
610 vbo_a = (vbo + mask) & ~mask;
613 tmp = min(vbo_a, end);
615 err = ntfs_zero_range(inode, vbo, tmp);
620 if (vbo < end_a && end_a < end) {
621 err = ntfs_zero_range(inode, end_a, end);
626 /* Aligned punch_hole */
629 err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
632 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
633 if (mode & ~FALLOC_FL_COLLAPSE_RANGE) {
639 * Write tail of the last page before removed range since
640 * it will get removed from the page cache below.
642 err = filemap_write_and_wait_range(inode->i_mapping, vbo_down,
648 * Write data that will be shifted to preserve them
649 * when discarding page cache below
651 err = filemap_write_and_wait_range(inode->i_mapping, end,
656 /* Wait for existing dio to complete */
657 inode_dio_wait(inode);
659 truncate_pagecache(inode, vbo_down);
662 err = attr_collapse_range(ni, vbo, len);
666 * normal file: allocate clusters, do not change 'valid' size
668 err = ntfs_set_size(inode, max(end, i_size));
672 if (is_sparsed(ni) || is_compressed(ni)) {
673 CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
674 CLST vcn = vbo >> sbi->cluster_bits;
675 CLST cend = bytes_to_cluster(sbi, end);
680 * allocate but not zero new clusters (see below comments)
681 * this breaks security (one can read unused on-disk areas)
682 * zeroing these clusters may be too long
683 * may be we should check here for root rights?
685 for (; vcn < cend; vcn += clen) {
686 err = attr_data_get_block(ni, vcn, cend - vcn,
690 if (!new || vcn >= vcn_v)
695 * NTFS is not able to store several unwritten areas
696 * Activate 'ntfs_sparse_cluster' to zero new allocated clusters
699 * 1G of sparsed clusters + 1 cluster of data =>
700 * valid_size == 1G + 1 cluster
701 * fallocate(1G) will zero 1G and this can be very long
702 * xfstest 016/086 will fail without 'ntfs_sparse_cluster'
704 ntfs_sparse_cluster(inode, NULL, vcn,
705 min(vcn_v - vcn, clen));
709 if (mode & FALLOC_FL_KEEP_SIZE) {
711 /*true - keep preallocated*/
712 err = attr_set_size(ni, ATTR_DATA, NULL, 0,
713 &ni->file.run, i_size, &ni->i_valid,
724 inode->i_ctime = inode->i_mtime = current_time(inode);
725 mark_inode_dirty(inode);
733 * inode_operations::setattr
735 int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
738 struct super_block *sb = dentry->d_sb;
739 struct ntfs_sb_info *sbi = sb->s_fs_info;
740 struct inode *inode = d_inode(dentry);
741 struct ntfs_inode *ni = ntfs_i(inode);
742 u32 ia_valid = attr->ia_valid;
743 umode_t mode = inode->i_mode;
746 if (sbi->options.no_acs_rules) {
747 /* "no access rules" - force any changes of time etc. */
748 attr->ia_valid |= ATTR_FORCE;
749 /* and disable for editing some attributes */
750 attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
751 ia_valid = attr->ia_valid;
754 err = setattr_prepare(mnt_userns, dentry, attr);
758 if (ia_valid & ATTR_SIZE) {
759 loff_t oldsize = inode->i_size;
761 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
762 /* should never be here, see ntfs_file_open*/
766 inode_dio_wait(inode);
768 if (attr->ia_size < oldsize)
769 err = ntfs_truncate(inode, attr->ia_size);
770 else if (attr->ia_size > oldsize)
771 err = ntfs_extend(inode, attr->ia_size, 0, NULL);
776 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
779 setattr_copy(mnt_userns, inode, attr);
781 if (mode != inode->i_mode) {
782 err = ntfs_acl_chmod(mnt_userns, inode);
786 /* linux 'w' -> windows 'ro' */
787 if (0222 & inode->i_mode)
788 ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
790 ni->std_fa |= FILE_ATTRIBUTE_READONLY;
793 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
794 ntfs_save_wsl_perm(inode);
795 mark_inode_dirty(inode);
800 static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
803 size_t count = iov_iter_count(iter);
804 struct file *file = iocb->ki_filp;
805 struct inode *inode = file->f_mapping->host;
806 struct ntfs_inode *ni = ntfs_i(inode);
808 if (is_encrypted(ni)) {
809 ntfs_inode_warn(inode, "encrypted i/o not supported");
813 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
814 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
818 #ifndef CONFIG_NTFS3_LZX_XPRESS
819 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
822 "activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
828 ntfs_inode_warn(inode, "read deduplicated not supported");
832 err = count ? generic_file_read_iter(iocb, iter) : 0;
837 /* returns array of locked pages */
838 static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
839 struct page **pages, u32 pages_per_frame,
840 bool *frame_uptodate)
842 gfp_t gfp_mask = mapping_gfp_mask(mapping);
845 *frame_uptodate = true;
847 for (npages = 0; npages < pages_per_frame; npages++, index++) {
850 page = find_or_create_page(mapping, index, gfp_mask);
853 page = pages[npages];
861 if (!PageUptodate(page))
862 *frame_uptodate = false;
864 pages[npages] = page;
870 /*helper for ntfs_file_write_iter (compressed files)*/
871 static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
874 struct file *file = iocb->ki_filp;
875 size_t count = iov_iter_count(from);
876 loff_t pos = iocb->ki_pos;
877 struct inode *inode = file_inode(file);
878 loff_t i_size = inode->i_size;
879 struct address_space *mapping = inode->i_mapping;
880 struct ntfs_inode *ni = ntfs_i(inode);
881 u64 valid = ni->i_valid;
882 struct ntfs_sb_info *sbi = ni->mi.sbi;
883 struct page *page, **pages = NULL;
885 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
886 u32 frame_size = 1u << frame_bits;
887 u32 pages_per_frame = frame_size >> PAGE_SHIFT;
894 if (frame_size < PAGE_SIZE) {
896 * frame_size == 8K if cluster 512
897 * frame_size == 64K if cluster 4096
899 ntfs_inode_warn(inode, "page size is bigger than frame size");
903 pages = kmalloc(pages_per_frame * sizeof(struct page *), GFP_NOFS);
907 current->backing_dev_info = inode_to_bdi(inode);
908 err = file_remove_privs(file);
912 err = file_update_time(file);
916 /* zero range [valid : pos) */
917 while (valid < pos) {
920 frame = valid >> frame_bits;
921 frame_vbo = valid & ~(frame_size - 1);
922 off = valid & (frame_size - 1);
924 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
929 if (lcn == SPARSE_LCN) {
930 ni->i_valid = valid =
931 frame_vbo + ((u64)clen << sbi->cluster_bits);
935 /* Load full frame */
936 err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
937 pages, pages_per_frame,
942 if (!frame_uptodate && off) {
943 err = ni_read_frame(ni, frame_vbo, pages,
946 for (ip = 0; ip < pages_per_frame; ip++) {
955 ip = off >> PAGE_SHIFT;
956 off = offset_in_page(valid);
957 for (; ip < pages_per_frame; ip++, off = 0) {
959 zero_user_segment(page, off, PAGE_SIZE);
960 flush_dcache_page(page);
961 SetPageUptodate(page);
965 err = ni_write_frame(ni, pages, pages_per_frame);
968 for (ip = 0; ip < pages_per_frame; ip++) {
970 SetPageUptodate(page);
978 ni->i_valid = valid = frame_vbo + frame_size;
981 /* copy user data [pos : pos + count) */
983 size_t copied, bytes;
985 off = pos & (frame_size - 1);
986 bytes = frame_size - off;
990 frame = pos >> frame_bits;
991 frame_vbo = pos & ~(frame_size - 1);
992 index = frame_vbo >> PAGE_SHIFT;
994 if (unlikely(iov_iter_fault_in_readable(from, bytes))) {
999 /* Load full frame */
1000 err = ntfs_get_frame_pages(mapping, index, pages,
1001 pages_per_frame, &frame_uptodate);
1005 if (!frame_uptodate) {
1006 loff_t to = pos + bytes;
1008 if (off || (to < i_size && (to & (frame_size - 1)))) {
1009 err = ni_read_frame(ni, frame_vbo, pages,
1012 for (ip = 0; ip < pages_per_frame;
1025 ip = off >> PAGE_SHIFT;
1026 off = offset_in_page(pos);
1028 /* copy user data to pages */
1030 size_t cp, tail = PAGE_SIZE - off;
1033 cp = copy_page_from_iter_atomic(page, off,
1034 min(tail, bytes), from);
1035 flush_dcache_page(page);
1051 err = ni_write_frame(ni, pages, pages_per_frame);
1054 for (ip = 0; ip < pages_per_frame; ip++) {
1056 ClearPageDirty(page);
1057 SetPageUptodate(page);
1066 * We can loop for a long time in here. Be nice and allow
1067 * us to schedule out to avoid softlocking if preempt
1075 count = iov_iter_count(from);
1081 current->backing_dev_info = NULL;
1086 iocb->ki_pos += written;
1087 if (iocb->ki_pos > ni->i_valid)
1088 ni->i_valid = iocb->ki_pos;
1094 * file_operations::write_iter
1096 static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1098 struct file *file = iocb->ki_filp;
1099 struct address_space *mapping = file->f_mapping;
1100 struct inode *inode = mapping->host;
1102 struct ntfs_inode *ni = ntfs_i(inode);
1104 if (is_encrypted(ni)) {
1105 ntfs_inode_warn(inode, "encrypted i/o not supported");
1109 if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
1110 ntfs_inode_warn(inode, "direct i/o + compressed not supported");
1115 ntfs_inode_warn(inode, "write into deduplicated not supported");
1119 if (!inode_trylock(inode)) {
1120 if (iocb->ki_flags & IOCB_NOWAIT)
1125 ret = generic_write_checks(iocb, from);
1129 if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
1130 /* should never be here, see ntfs_file_open*/
1135 ret = ntfs_extend(inode, iocb->ki_pos, ret, file);
1139 ret = is_compressed(ni) ? ntfs_compress_write(iocb, from)
1140 : __generic_file_write_iter(iocb, from);
1143 inode_unlock(inode);
1146 ret = generic_write_sync(iocb, ret);
1152 * file_operations::open
1154 int ntfs_file_open(struct inode *inode, struct file *file)
1156 struct ntfs_inode *ni = ntfs_i(inode);
1158 if (unlikely((is_compressed(ni) || is_encrypted(ni)) &&
1159 (file->f_flags & O_DIRECT))) {
1163 /* Decompress "external compressed" file if opened for rw */
1164 if ((ni->ni_flags & NI_FLAG_COMPRESSED_MASK) &&
1165 (file->f_flags & (O_WRONLY | O_RDWR | O_TRUNC))) {
1166 #ifdef CONFIG_NTFS3_LZX_XPRESS
1167 int err = ni_decompress_file(ni);
1174 "activate CONFIG_NTFS3_LZX_XPRESS to write external compressed files");
1179 return generic_file_open(inode, file);
1183 * file_operations::release
1185 static int ntfs_file_release(struct inode *inode, struct file *file)
1187 struct ntfs_inode *ni = ntfs_i(inode);
1188 struct ntfs_sb_info *sbi = ni->mi.sbi;
1191 /* if we are the last writer on the inode, drop the block reservation */
1192 if (sbi->options.prealloc && ((file->f_mode & FMODE_WRITE) &&
1193 atomic_read(&inode->i_writecount) == 1)) {
1195 down_write(&ni->file.run_lock);
1197 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
1198 inode->i_size, &ni->i_valid, false, NULL);
1200 up_write(&ni->file.run_lock);
1206 /* file_operations::fiemap */
1207 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1208 __u64 start, __u64 len)
1211 struct ntfs_inode *ni = ntfs_i(inode);
1213 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1218 err = ni_fiemap(ni, fieinfo, start, len);
1226 const struct inode_operations ntfs_file_inode_operations = {
1227 .getattr = ntfs_getattr,
1228 .setattr = ntfs3_setattr,
1229 .listxattr = ntfs_listxattr,
1230 .permission = ntfs_permission,
1231 .get_acl = ntfs_get_acl,
1232 .set_acl = ntfs_set_acl,
1233 .fiemap = ntfs_fiemap,
1236 const struct file_operations ntfs_file_operations = {
1237 .llseek = generic_file_llseek,
1238 .read_iter = ntfs_file_read_iter,
1239 .write_iter = ntfs_file_write_iter,
1240 .unlocked_ioctl = ntfs_ioctl,
1241 #ifdef CONFIG_COMPAT
1242 .compat_ioctl = ntfs_compat_ioctl,
1244 .splice_read = generic_file_splice_read,
1245 .mmap = ntfs_file_mmap,
1246 .open = ntfs_file_open,
1247 .fsync = generic_file_fsync,
1248 .splice_write = iter_file_splice_write,
1249 .fallocate = ntfs_fallocate,
1250 .release = ntfs_file_release,