1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
8 #include <linux/buffer_head.h>
10 #include <linux/mpage.h>
11 #include <linux/namei.h>
12 #include <linux/nls.h>
13 #include <linux/uio.h>
14 #include <linux/writeback.h>
21 * ntfs_read_mft - Read record and parses MFT.
23 static struct inode *ntfs_read_mft(struct inode *inode,
24 const struct cpu_str *name,
25 const struct MFT_REF *ref)
28 struct ntfs_inode *ni = ntfs_i(inode);
29 struct super_block *sb = inode->i_sb;
30 struct ntfs_sb_info *sbi = sb->s_fs_info;
32 struct ATTR_STD_INFO5 *std5 = NULL;
33 struct ATTR_LIST_ENTRY *le;
35 bool is_match = false;
38 unsigned long ino = inode->i_ino;
39 u32 rp_fa = 0, asize, t32;
40 u16 roff, rsize, names = 0;
41 const struct ATTR_FILE_NAME *fname = NULL;
42 const struct INDEX_ROOT *root;
43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
46 struct runs_tree *run;
50 /* Setup 'uid' and 'gid' */
51 inode->i_uid = sbi->options->fs_uid;
52 inode->i_gid = sbi->options->fs_gid;
54 err = mi_init(&ni->mi, sbi, ino);
58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
59 t64 = sbi->mft.lbo >> sbi->cluster_bits;
60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
62 init_rwsem(&ni->file.run_lock);
64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
70 err = mi_read(&ni->mi, ino == MFT_REC_MFT);
77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
79 } else if (ref->seq != rec->seq) {
81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
84 } else if (!is_rec_inuse(rec)) {
86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
90 if (le32_to_cpu(rec->total) != sbi->record_size) {
96 if (!is_rec_base(rec)) {
101 /* Record should contain $I30 root. */
102 is_dir = rec->flags & RECORD_FLAG_DIR;
104 /* MFT_REC_MFT is not a dir */
105 if (is_dir && ino == MFT_REC_MFT) {
110 inode->i_generation = le16_to_cpu(rec->seq);
112 /* Enumerate all struct Attributes MFT. */
117 * To reduce tab pressure use goto instead of
118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
123 attr = ni_enum_attr_ex(ni, attr, &le, NULL);
128 /* This is non primary attribute segment. Ignore if not MFT. */
129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
133 asize = le32_to_cpu(attr->size);
134 goto attr_unpack_run;
137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
139 asize = le32_to_cpu(attr->size);
142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
143 * There not critical to check this case again
145 if (attr->name_len &&
146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
151 t64 = le64_to_cpu(attr->nres.alloc_size);
152 if (le64_to_cpu(attr->nres.data_size) > t64 ||
153 le64_to_cpu(attr->nres.valid_size) > t64)
157 switch (attr->type) {
160 asize < sizeof(struct ATTR_STD_INFO) + roff ||
161 rsize < sizeof(struct ATTR_STD_INFO))
167 std5 = Add2Ptr(attr, roff);
170 nt2kernel(std5->cr_time, &ni->i_crtime);
172 nt2kernel(std5->a_time, &ts);
173 inode_set_atime_to_ts(inode, ts);
174 nt2kernel(std5->c_time, &ts);
175 inode_set_ctime_to_ts(inode, ts);
176 nt2kernel(std5->m_time, &ts);
177 inode_set_mtime_to_ts(inode, ts);
179 ni->std_fa = std5->fa;
181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
182 rsize >= sizeof(struct ATTR_STD_INFO5))
183 ni->std_security_id = std5->security_id;
187 if (attr->name_len || le || ino == MFT_REC_LOG)
190 err = ntfs_load_attr_list(ni, attr);
199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
200 rsize < SIZEOF_ATTRIBUTE_FILENAME)
203 fname = Add2Ptr(attr, roff);
204 if (fname->type == FILE_NAME_DOS)
208 if (name && name->len == fname->name_len &&
209 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
217 /* Ignore data attribute in dir record. */
221 if (ino == MFT_REC_BADCLUST && !attr->non_res)
224 if (attr->name_len &&
225 ((ino != MFT_REC_BADCLUST || !attr->non_res ||
226 attr->name_len != ARRAY_SIZE(BAD_NAME) ||
227 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
228 (ino != MFT_REC_SECURE || !attr->non_res ||
229 attr->name_len != ARRAY_SIZE(SDS_NAME) ||
230 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
231 /* File contains stream attribute. Ignore it. */
235 if (is_attr_sparsed(attr))
236 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
238 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
240 if (is_attr_compressed(attr))
241 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
243 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
245 if (is_attr_encrypted(attr))
246 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
248 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
250 if (!attr->non_res) {
251 ni->i_valid = inode->i_size = rsize;
252 inode_set_bytes(inode, rsize);
255 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
257 if (!attr->non_res) {
258 ni->ni_flags |= NI_FLAG_RESIDENT;
262 inode_set_bytes(inode, attr_ondisk_size(attr));
264 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
265 inode->i_size = le64_to_cpu(attr->nres.data_size);
266 if (!attr->nres.alloc_size)
269 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
277 root = Add2Ptr(attr, roff);
279 if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
280 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
283 if (root->type != ATTR_NAME ||
284 root->rule != NTFS_COLLATION_TYPE_FILENAME)
291 ni->ni_flags |= NI_FLAG_DIR;
293 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
298 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
303 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
304 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
307 inode->i_size = le64_to_cpu(attr->nres.data_size);
308 ni->i_valid = le64_to_cpu(attr->nres.valid_size);
309 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
311 run = &ni->dir.alloc_run;
315 if (ino == MFT_REC_MFT) {
318 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
319 /* 0x20000000 = 2^32 / 8 */
320 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
323 run = &sbi->mft.bitmap.run;
325 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
326 !memcmp(attr_name(attr), I30_NAME,
329 run = &ni->dir.bitmap_run;
338 rp_fa = ni_parse_reparse(ni, attr, &rp);
343 * Assume one unicode symbol == one utf8.
345 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
349 ni->i_valid = inode->i_size;
351 /* Clear directory bit. */
352 if (ni->ni_flags & NI_FLAG_DIR) {
353 indx_clear(&ni->dir);
354 memset(&ni->dir, 0, sizeof(ni->dir));
355 ni->ni_flags &= ~NI_FLAG_DIR;
357 run_close(&ni->file.run);
359 mode = S_IFLNK | 0777;
363 goto attr_unpack_run; // Double break.
367 case REPARSE_COMPRESSED:
370 case REPARSE_DEDUPLICATED:
376 if (!attr->name_len &&
377 resident_data_ex(attr, sizeof(struct EA_INFO))) {
378 ni->ni_flags |= NI_FLAG_EA;
380 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
382 inode->i_mode = mode;
383 ntfs_get_wsl_perm(inode);
384 mode = inode->i_mode;
393 roff = le16_to_cpu(attr->nres.run_off);
400 t64 = le64_to_cpu(attr->nres.svcn);
402 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
403 t64, Add2Ptr(attr, roff), asize - roff);
414 if (!is_match && name) {
415 /* Reuse rec as buffer for ascii name. */
420 if (std5->fa & FILE_ATTRIBUTE_READONLY)
428 if (names != le16_to_cpu(rec->hard_links)) {
429 /* Correct minor error on the fly. Do not mark inode as dirty. */
430 rec->hard_links = cpu_to_le16(names);
434 set_nlink(inode, names);
437 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
440 * Dot and dot-dot should be included in count but was not
441 * included in enumeration.
442 * Usually a hard links to directories are disabled.
444 inode->i_op = &ntfs_dir_inode_operations;
445 inode->i_fop = &ntfs_dir_operations;
447 } else if (S_ISLNK(mode)) {
448 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
449 inode->i_op = &ntfs_link_inode_operations;
451 inode_nohighmem(inode);
452 } else if (S_ISREG(mode)) {
453 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
454 inode->i_op = &ntfs_file_inode_operations;
455 inode->i_fop = &ntfs_file_operations;
456 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
458 if (ino != MFT_REC_MFT)
459 init_rwsem(&ni->file.run_lock);
460 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
462 inode->i_op = &ntfs_special_inode_operations;
463 init_special_inode(inode, mode, inode->i_rdev);
464 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
465 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
466 /* Records in $Extend are not a files or general directories. */
467 inode->i_op = &ntfs_file_inode_operations;
473 if ((sbi->options->sys_immutable &&
474 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
475 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
476 inode->i_flags |= S_IMMUTABLE;
478 inode->i_flags &= ~S_IMMUTABLE;
481 inode->i_mode = mode;
482 if (!(ni->ni_flags & NI_FLAG_EA)) {
483 /* If no xattr then no security (stored in xattr). */
484 inode->i_flags |= S_NOSEC;
487 if (ino == MFT_REC_MFT && !sb->s_root)
490 unlock_new_inode(inode);
495 if (ino == MFT_REC_MFT && !sb->s_root)
505 * Return: 1 if match.
507 static int ntfs_test_inode(struct inode *inode, void *data)
509 struct MFT_REF *ref = data;
511 return ino_get(ref) == inode->i_ino;
514 static int ntfs_set_inode(struct inode *inode, void *data)
516 const struct MFT_REF *ref = data;
518 inode->i_ino = ino_get(ref);
522 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
523 const struct cpu_str *name)
527 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
529 if (unlikely(!inode))
530 return ERR_PTR(-ENOMEM);
532 /* If this is a freshly allocated inode, need to read it now. */
533 if (inode->i_state & I_NEW)
534 inode = ntfs_read_mft(inode, name, ref);
535 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
536 /* Inode overlaps? */
537 _ntfs_bad_inode(inode);
540 if (IS_ERR(inode) && name)
541 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
547 GET_BLOCK_GENERAL = 0,
548 GET_BLOCK_WRITE_BEGIN = 1,
549 GET_BLOCK_DIRECT_IO_R = 2,
550 GET_BLOCK_DIRECT_IO_W = 3,
554 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
555 struct buffer_head *bh, int create,
556 enum get_block_ctx ctx)
558 struct super_block *sb = inode->i_sb;
559 struct ntfs_sb_info *sbi = sb->s_fs_info;
560 struct ntfs_inode *ni = ntfs_i(inode);
561 struct folio *folio = bh->b_folio;
562 u8 cluster_bits = sbi->cluster_bits;
563 u32 block_size = sb->s_blocksize;
564 u64 bytes, lbo, valid;
570 /* Clear previous state. */
571 clear_buffer_new(bh);
572 clear_buffer_uptodate(bh);
574 if (is_resident(ni)) {
576 err = attr_data_read_resident(ni, &folio->page);
580 set_buffer_uptodate(bh);
581 bh->b_size = block_size;
585 vcn = vbo >> cluster_bits;
586 off = vbo & sbi->cluster_mask;
589 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
590 create && sbi->cluster_size > PAGE_SIZE);
597 bytes = ((u64)len << cluster_bits) - off;
599 if (lcn == SPARSE_LCN) {
601 if (bh->b_size > bytes)
611 lbo = ((u64)lcn << cluster_bits) + off;
613 set_buffer_mapped(bh);
614 bh->b_bdev = sb->s_bdev;
615 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
619 if (ctx == GET_BLOCK_DIRECT_IO_W) {
620 /* ntfs_direct_IO will update ni->i_valid. */
625 if (bytes > bh->b_size)
631 if (vbo + bytes > valid) {
632 ni->i_valid = vbo + bytes;
633 mark_inode_dirty(inode);
635 } else if (vbo >= valid) {
636 /* Read out of valid data. */
637 clear_buffer_mapped(bh);
638 } else if (vbo + bytes <= valid) {
640 } else if (vbo + block_size <= valid) {
641 /* Normal short read. */
645 * Read across valid size: vbo < valid && valid < vbo + block_size
650 u32 voff = valid - vbo;
652 bh->b_size = block_size;
653 off = vbo & (PAGE_SIZE - 1);
654 folio_set_bh(bh, folio, off);
656 err = bh_read(bh, 0);
659 folio_zero_segment(folio, off + voff, off + block_size);
663 if (bh->b_size > bytes)
667 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
668 static_assert(sizeof(size_t) < sizeof(loff_t));
669 if (bytes > 0x40000000u)
670 bh->b_size = 0x40000000u;
680 int ntfs_get_block(struct inode *inode, sector_t vbn,
681 struct buffer_head *bh_result, int create)
683 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
684 bh_result, create, GET_BLOCK_GENERAL);
687 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
688 struct buffer_head *bh_result, int create)
690 return ntfs_get_block_vbo(inode,
691 (u64)vsn << inode->i_sb->s_blocksize_bits,
692 bh_result, create, GET_BLOCK_BMAP);
695 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
697 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
700 static int ntfs_read_folio(struct file *file, struct folio *folio)
702 struct page *page = &folio->page;
704 struct address_space *mapping = page->mapping;
705 struct inode *inode = mapping->host;
706 struct ntfs_inode *ni = ntfs_i(inode);
708 if (is_resident(ni)) {
710 err = attr_data_read_resident(ni, page);
712 if (err != E_NTFS_NONRESIDENT) {
718 if (is_compressed(ni)) {
720 err = ni_readpage_cmpr(ni, page);
725 /* Normal + sparse files. */
726 return mpage_read_folio(folio, ntfs_get_block);
729 static void ntfs_readahead(struct readahead_control *rac)
731 struct address_space *mapping = rac->mapping;
732 struct inode *inode = mapping->host;
733 struct ntfs_inode *ni = ntfs_i(inode);
737 if (is_resident(ni)) {
738 /* No readahead for resident. */
742 if (is_compressed(ni)) {
743 /* No readahead for compressed. */
748 pos = readahead_pos(rac);
750 if (valid < i_size_read(inode) && pos <= valid &&
751 valid < pos + readahead_length(rac)) {
752 /* Range cross 'valid'. Read it page by page. */
756 mpage_readahead(rac, ntfs_get_block);
759 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
760 struct buffer_head *bh_result, int create)
762 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
763 bh_result, create, GET_BLOCK_DIRECT_IO_R);
766 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
767 struct buffer_head *bh_result, int create)
769 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
770 bh_result, create, GET_BLOCK_DIRECT_IO_W);
773 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
775 struct file *file = iocb->ki_filp;
776 struct address_space *mapping = file->f_mapping;
777 struct inode *inode = mapping->host;
778 struct ntfs_inode *ni = ntfs_i(inode);
779 loff_t vbo = iocb->ki_pos;
781 int wr = iov_iter_rw(iter) & WRITE;
782 size_t iter_count = iov_iter_count(iter);
786 if (is_resident(ni)) {
787 /* Switch to buffered write. */
792 ret = blockdev_direct_IO(iocb, inode, iter,
793 wr ? ntfs_get_block_direct_IO_W :
794 ntfs_get_block_direct_IO_R);
798 else if (wr && ret == -EIOCBQUEUED)
799 end = vbo + iter_count;
805 if (end > valid && !S_ISBLK(inode->i_mode)) {
807 mark_inode_dirty(inode);
809 } else if (vbo < valid && valid < end) {
811 iov_iter_revert(iter, end - valid);
812 iov_iter_zero(end - valid, iter);
819 int ntfs_set_size(struct inode *inode, u64 new_size)
821 struct super_block *sb = inode->i_sb;
822 struct ntfs_sb_info *sbi = sb->s_fs_info;
823 struct ntfs_inode *ni = ntfs_i(inode);
826 /* Check for maximum file size. */
827 if (is_sparsed(ni) || is_compressed(ni)) {
828 if (new_size > sbi->maxbytes_sparse) {
832 } else if (new_size > sbi->maxbytes) {
838 down_write(&ni->file.run_lock);
840 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
841 &ni->i_valid, true, NULL);
843 up_write(&ni->file.run_lock);
846 mark_inode_dirty(inode);
852 static int ntfs_resident_writepage(struct folio *folio,
853 struct writeback_control *wbc, void *data)
855 struct address_space *mapping = data;
856 struct ntfs_inode *ni = ntfs_i(mapping->host);
860 ret = attr_data_write_resident(ni, &folio->page);
863 if (ret != E_NTFS_NONRESIDENT)
865 mapping_set_error(mapping, ret);
869 static int ntfs_writepages(struct address_space *mapping,
870 struct writeback_control *wbc)
872 if (is_resident(ntfs_i(mapping->host)))
873 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
875 return mpage_writepages(mapping, wbc, ntfs_get_block);
878 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
879 struct buffer_head *bh_result, int create)
881 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
882 bh_result, create, GET_BLOCK_WRITE_BEGIN);
885 int ntfs_write_begin(struct file *file, struct address_space *mapping,
886 loff_t pos, u32 len, struct page **pagep, void **fsdata)
889 struct inode *inode = mapping->host;
890 struct ntfs_inode *ni = ntfs_i(inode);
893 if (is_resident(ni)) {
895 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
903 err = attr_data_read_resident(ni, page);
913 if (err != E_NTFS_NONRESIDENT)
917 err = block_write_begin(mapping, pos, len, pagep,
918 ntfs_get_block_write_begin);
925 * ntfs_write_end - Address_space_operations::write_end.
927 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
928 u32 len, u32 copied, struct page *page, void *fsdata)
930 struct inode *inode = mapping->host;
931 struct ntfs_inode *ni = ntfs_i(inode);
932 u64 valid = ni->i_valid;
936 if (is_resident(ni)) {
938 err = attr_data_write_resident(ni, page);
942 /* Clear any buffers in page. */
943 if (page_has_buffers(page)) {
944 struct buffer_head *head, *bh;
946 bh = head = page_buffers(page);
948 clear_buffer_dirty(bh);
949 clear_buffer_mapped(bh);
950 set_buffer_uptodate(bh);
951 } while (head != (bh = bh->b_this_page));
953 SetPageUptodate(page);
959 err = generic_write_end(file, mapping, pos, len, copied, page,
964 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
965 inode_set_mtime_to_ts(inode,
966 inode_set_ctime_current(inode));
967 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
971 if (valid != ni->i_valid) {
972 /* ni->i_valid is changed in ntfs_get_block_vbo. */
976 if (pos + err > inode->i_size) {
977 inode->i_size = pos + err;
982 mark_inode_dirty(inode);
988 int reset_log_file(struct inode *inode)
992 u32 log_size = inode->i_size;
993 struct address_space *mapping = inode->i_mapping;
1000 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1002 err = block_write_begin(mapping, pos, len, &page,
1003 ntfs_get_block_write_begin);
1007 kaddr = kmap_atomic(page);
1008 memset(kaddr, -1, len);
1009 kunmap_atomic(kaddr);
1010 flush_dcache_page(page);
1012 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1017 if (pos >= log_size)
1019 balance_dirty_pages_ratelimited(mapping);
1022 mark_inode_dirty_sync(inode);
1027 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1029 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1032 int ntfs_sync_inode(struct inode *inode)
1034 return _ni_write_inode(inode, 1);
1038 * writeback_inode - Helper function for ntfs_flush_inodes().
1040 * This writes both the inode and the file data blocks, waiting
1041 * for in flight data blocks before the start of the call. It
1042 * does not wait for any io started during the call.
1044 static int writeback_inode(struct inode *inode)
1046 int ret = sync_inode_metadata(inode, 0);
1049 ret = filemap_fdatawrite(inode->i_mapping);
1056 * Write data and metadata corresponding to i1 and i2. The io is
1057 * started but we do not wait for any of it to finish.
1059 * filemap_flush() is used for the block device, so if there is a dirty
1060 * page for a block already in flight, we will not wait and start the
1063 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1069 ret = writeback_inode(i1);
1071 ret = writeback_inode(i2);
1073 ret = sync_blockdev_nowait(sb->s_bdev);
1077 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1081 /* Write non resident data. */
1082 for (idx = 0; bytes; idx++) {
1083 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1084 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1087 return PTR_ERR(page);
1090 WARN_ON(!PageUptodate(page));
1091 ClearPageUptodate(page);
1093 memcpy(page_address(page), data, op);
1095 flush_dcache_page(page);
1096 SetPageUptodate(page);
1099 ntfs_unmap_page(page);
1102 data = Add2Ptr(data, PAGE_SIZE);
1108 * ntfs_reparse_bytes
1110 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1111 * for unicode string of @uni_len length.
1113 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1115 /* Header + unicode string + decorated unicode string. */
1116 return sizeof(short) * (2 * uni_len + 4) +
1117 offsetof(struct REPARSE_DATA_BUFFER,
1118 SymbolicLinkReparseBuffer.PathBuffer);
1121 static struct REPARSE_DATA_BUFFER *
1122 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1123 u32 size, u16 *nsize)
1126 struct REPARSE_DATA_BUFFER *rp;
1128 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1130 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1132 return ERR_PTR(-ENOMEM);
1134 rs = &rp->SymbolicLinkReparseBuffer;
1135 rp_name = rs->PathBuffer;
1137 /* Convert link name to UTF-16. */
1138 err = ntfs_nls_to_utf16(sbi, symname, size,
1139 (struct cpu_str *)(rp_name - 1), 2 * size,
1140 UTF16_LITTLE_ENDIAN);
1144 /* err = the length of unicode name of symlink. */
1145 *nsize = ntfs_reparse_bytes(err);
1147 if (*nsize > sbi->reparse.max_size) {
1152 /* Translate Linux '/' into Windows '\'. */
1153 for (i = 0; i < err; i++) {
1154 if (rp_name[i] == cpu_to_le16('/'))
1155 rp_name[i] = cpu_to_le16('\\');
1158 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1159 rp->ReparseDataLength =
1160 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1161 SymbolicLinkReparseBuffer));
1163 /* PrintName + SubstituteName. */
1164 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1165 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1166 rs->PrintNameLength = rs->SubstituteNameOffset;
1169 * TODO: Use relative path if possible to allow Windows to
1171 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1175 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1177 /* Decorate SubstituteName. */
1179 rp_name[0] = cpu_to_le16('\\');
1180 rp_name[1] = cpu_to_le16('?');
1181 rp_name[2] = cpu_to_le16('?');
1182 rp_name[3] = cpu_to_le16('\\');
1187 return ERR_PTR(err);
1193 * Helper function for:
1198 * - ntfs_atomic_open
1200 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1202 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1203 struct dentry *dentry,
1204 const struct cpu_str *uni, umode_t mode,
1205 dev_t dev, const char *symname, u32 size,
1206 struct ntfs_fnd *fnd)
1209 struct super_block *sb = dir->i_sb;
1210 struct ntfs_sb_info *sbi = sb->s_fs_info;
1211 const struct qstr *name = &dentry->d_name;
1213 struct ntfs_inode *dir_ni = ntfs_i(dir);
1214 struct ntfs_inode *ni = NULL;
1215 struct inode *inode = NULL;
1216 struct ATTRIB *attr;
1217 struct ATTR_STD_INFO5 *std5;
1218 struct ATTR_FILE_NAME *fname;
1219 struct MFT_REC *rec;
1220 u32 asize, dsize, sd_size;
1221 enum FILE_ATTRIBUTE fa;
1222 __le32 security_id = SECURITY_ID_INVALID;
1225 u16 t16, nsize = 0, aid = 0;
1226 struct INDEX_ROOT *root, *dir_root;
1227 struct NTFS_DE *e, *new_de = NULL;
1228 struct REPARSE_DATA_BUFFER *rp = NULL;
1229 bool rp_inserted = false;
1232 ni_lock_dir(dir_ni);
1234 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1240 if (S_ISDIR(mode)) {
1241 /* Use parent's directory attributes. */
1242 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1243 FILE_ATTRIBUTE_ARCHIVE;
1245 * By default child directory inherits parent attributes.
1246 * Root directory is hidden + system.
1247 * Make an exception for children in root.
1249 if (dir->i_ino == MFT_REC_ROOT)
1250 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1251 } else if (S_ISLNK(mode)) {
1252 /* It is good idea that link should be the same type (file/dir) as target */
1253 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1256 * Linux: there are dir/file/symlink and so on.
1257 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1258 * It is good idea to create:
1259 * dir + reparse if 'symname' points to directory
1261 * file + reparse if 'symname' points to file
1262 * Unfortunately kern_path hangs if symname contains 'dir'.
1268 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1269 * struct inode *target = d_inode(path.dentry);
1271 * if (S_ISDIR(target->i_mode))
1272 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1273 * // if ( target->i_sb == sb ){
1274 * // use relative path?
1279 } else if (S_ISREG(mode)) {
1280 if (sbi->options->sparse) {
1281 /* Sparsed regular file, cause option 'sparse'. */
1282 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1283 FILE_ATTRIBUTE_ARCHIVE;
1284 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1285 /* Compressed regular file, if parent is compressed. */
1286 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1288 /* Regular file, default attributes. */
1289 fa = FILE_ATTRIBUTE_ARCHIVE;
1292 fa = FILE_ATTRIBUTE_ARCHIVE;
1295 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1296 if (sbi->options->hide_dot_files && name->name[0] == '.')
1297 fa |= FILE_ATTRIBUTE_HIDDEN;
1300 fa |= FILE_ATTRIBUTE_READONLY;
1302 /* Allocate PATH_MAX bytes. */
1303 new_de = __getname();
1309 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1310 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1312 /* Step 1: allocate and fill new mft record. */
1313 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1317 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1323 inode = &ni->vfs_inode;
1324 inode_init_owner(idmap, inode, dir, mode);
1325 mode = inode->i_mode;
1327 ni->i_crtime = current_time(inode);
1330 rec->hard_links = cpu_to_le16(1);
1331 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1333 /* Get default security id. */
1334 sd = s_default_security;
1335 sd_size = sizeof(s_default_security);
1337 if (is_ntfs3(sbi)) {
1338 security_id = dir_ni->std_security_id;
1339 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1340 security_id = sbi->security.def_security_id;
1342 if (security_id == SECURITY_ID_INVALID &&
1343 !ntfs_insert_security(sbi, sd, sd_size,
1344 &security_id, NULL))
1345 sbi->security.def_security_id = security_id;
1349 /* Insert standard info. */
1350 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1352 if (security_id == SECURITY_ID_INVALID) {
1353 dsize = sizeof(struct ATTR_STD_INFO);
1355 dsize = sizeof(struct ATTR_STD_INFO5);
1356 std5->security_id = security_id;
1357 ni->std_security_id = security_id;
1359 asize = SIZEOF_RESIDENT + dsize;
1361 attr->type = ATTR_STD;
1362 attr->size = cpu_to_le32(asize);
1363 attr->id = cpu_to_le16(aid++);
1364 attr->res.data_off = SIZEOF_RESIDENT_LE;
1365 attr->res.data_size = cpu_to_le32(dsize);
1367 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1368 kernel2nt(&ni->i_crtime);
1370 std5->fa = ni->std_fa = fa;
1372 attr = Add2Ptr(attr, asize);
1374 /* Insert file name. */
1375 err = fill_name_de(sbi, new_de, name, uni);
1379 mi_get_ref(&ni->mi, &new_de->ref);
1381 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1383 if (sbi->options->windows_names &&
1384 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1389 mi_get_ref(&dir_ni->mi, &fname->home);
1390 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1391 fname->dup.a_time = std5->cr_time;
1392 fname->dup.alloc_size = fname->dup.data_size = 0;
1393 fname->dup.fa = std5->fa;
1394 fname->dup.ea_size = fname->dup.reparse = 0;
1396 dsize = le16_to_cpu(new_de->key_size);
1397 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1399 attr->type = ATTR_NAME;
1400 attr->size = cpu_to_le32(asize);
1401 attr->res.data_off = SIZEOF_RESIDENT_LE;
1402 attr->res.flags = RESIDENT_FLAG_INDEXED;
1403 attr->id = cpu_to_le16(aid++);
1404 attr->res.data_size = cpu_to_le32(dsize);
1405 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1407 attr = Add2Ptr(attr, asize);
1409 if (security_id == SECURITY_ID_INVALID) {
1410 /* Insert security attribute. */
1411 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1413 attr->type = ATTR_SECURE;
1414 attr->size = cpu_to_le32(asize);
1415 attr->id = cpu_to_le16(aid++);
1416 attr->res.data_off = SIZEOF_RESIDENT_LE;
1417 attr->res.data_size = cpu_to_le32(sd_size);
1418 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1420 attr = Add2Ptr(attr, asize);
1423 attr->id = cpu_to_le16(aid++);
1424 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1426 * Regular directory or symlink to directory.
1427 * Create root attribute.
1429 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1430 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1432 attr->type = ATTR_ROOT;
1433 attr->size = cpu_to_le32(asize);
1435 attr->name_len = ARRAY_SIZE(I30_NAME);
1436 attr->name_off = SIZEOF_RESIDENT_LE;
1437 attr->res.data_off =
1438 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1439 attr->res.data_size = cpu_to_le32(dsize);
1440 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1443 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1444 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1445 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1446 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1447 sizeof(struct NTFS_DE));
1448 root->ihdr.total = root->ihdr.used;
1450 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1451 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1452 e->flags = NTFS_IE_LAST;
1453 } else if (S_ISLNK(mode)) {
1456 * Create empty resident data attribute.
1458 asize = SIZEOF_RESIDENT;
1460 /* Insert empty ATTR_DATA */
1461 attr->type = ATTR_DATA;
1462 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1463 attr->name_off = SIZEOF_RESIDENT_LE;
1464 attr->res.data_off = SIZEOF_RESIDENT_LE;
1465 } else if (S_ISREG(mode)) {
1467 * Regular file. Create empty non resident data attribute.
1469 attr->type = ATTR_DATA;
1471 attr->nres.evcn = cpu_to_le64(-1ll);
1472 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1474 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1475 attr->flags = ATTR_FLAG_SPARSED;
1476 asize = SIZEOF_NONRESIDENT_EX + 8;
1477 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1478 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1479 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1480 attr->flags = ATTR_FLAG_COMPRESSED;
1481 attr->nres.c_unit = COMPRESSION_UNIT;
1482 asize = SIZEOF_NONRESIDENT_EX + 8;
1484 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1485 attr->name_off = SIZEOF_NONRESIDENT_LE;
1486 asize = SIZEOF_NONRESIDENT + 8;
1488 attr->nres.run_off = attr->name_off;
1491 * Node. Create empty resident data attribute.
1493 attr->type = ATTR_DATA;
1494 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1495 attr->name_off = SIZEOF_RESIDENT_LE;
1496 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1497 attr->flags = ATTR_FLAG_SPARSED;
1498 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1499 attr->flags = ATTR_FLAG_COMPRESSED;
1500 attr->res.data_off = SIZEOF_RESIDENT_LE;
1501 asize = SIZEOF_RESIDENT;
1502 ni->ni_flags |= NI_FLAG_RESIDENT;
1505 if (S_ISDIR(mode)) {
1506 ni->ni_flags |= NI_FLAG_DIR;
1507 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1510 } else if (S_ISLNK(mode)) {
1511 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1520 * Insert ATTR_REPARSE.
1522 attr = Add2Ptr(attr, asize);
1523 attr->type = ATTR_REPARSE;
1524 attr->id = cpu_to_le16(aid++);
1526 /* Resident or non resident? */
1527 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1528 t16 = PtrOffset(rec, attr);
1531 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1532 * It is good idea to keep extened attributes resident.
1534 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1536 CLST clst = bytes_to_cluster(sbi, nsize);
1538 /* Bytes per runs. */
1539 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1542 attr->nres.evcn = cpu_to_le64(clst - 1);
1543 attr->name_off = SIZEOF_NONRESIDENT_LE;
1544 attr->nres.run_off = attr->name_off;
1545 attr->nres.data_size = cpu_to_le64(nsize);
1546 attr->nres.valid_size = attr->nres.data_size;
1547 attr->nres.alloc_size =
1548 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1550 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1551 clst, NULL, ALLOCATE_DEF,
1552 &alen, 0, NULL, NULL);
1556 err = run_pack(&ni->file.run, 0, clst,
1557 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1567 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1568 /* Write non resident data. */
1569 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1574 attr->res.data_off = SIZEOF_RESIDENT_LE;
1575 attr->res.data_size = cpu_to_le32(nsize);
1576 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1578 /* Size of symlink equals the length of input string. */
1579 inode->i_size = size;
1581 attr->size = cpu_to_le32(asize);
1583 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1591 attr = Add2Ptr(attr, asize);
1592 attr->type = ATTR_END;
1594 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1595 rec->next_attr_id = cpu_to_le16(aid);
1597 inode->i_generation = le16_to_cpu(rec->seq);
1599 if (S_ISDIR(mode)) {
1600 inode->i_op = &ntfs_dir_inode_operations;
1601 inode->i_fop = &ntfs_dir_operations;
1602 } else if (S_ISLNK(mode)) {
1603 inode->i_op = &ntfs_link_inode_operations;
1604 inode->i_fop = NULL;
1605 inode->i_mapping->a_ops = &ntfs_aops;
1606 inode->i_size = size;
1607 inode_nohighmem(inode);
1608 } else if (S_ISREG(mode)) {
1609 inode->i_op = &ntfs_file_inode_operations;
1610 inode->i_fop = &ntfs_file_operations;
1611 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1613 init_rwsem(&ni->file.run_lock);
1615 inode->i_op = &ntfs_special_inode_operations;
1616 init_special_inode(inode, mode, dev);
1619 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1620 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1621 err = ntfs_init_acl(idmap, inode, dir);
1627 inode->i_flags |= S_NOSEC;
1631 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1632 * The packed size of extended attribute is stored in direntry too.
1633 * 'fname' here points to inside new_de.
1635 ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1638 * update ea_size in file_name attribute too.
1639 * Use ni_find_attr cause layout of MFT record may be changed
1640 * in ntfs_init_acl and ntfs_save_wsl_perm.
1642 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1644 struct ATTR_FILE_NAME *fn;
1646 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1648 fn->dup.ea_size = fname->dup.ea_size;
1651 /* We do not need to update parent directory later */
1652 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1654 /* Step 2: Add new name in index. */
1655 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1660 * Call 'd_instantiate' after inode->i_op is set
1661 * but before finish_open.
1663 d_instantiate(dentry, inode);
1665 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1666 inode_set_atime_to_ts(inode, ni->i_crtime);
1667 inode_set_ctime_to_ts(inode, ni->i_crtime);
1668 inode_set_mtime_to_ts(inode, ni->i_crtime);
1669 inode_set_mtime_to_ts(dir, ni->i_crtime);
1670 inode_set_ctime_to_ts(dir, ni->i_crtime);
1672 mark_inode_dirty(dir);
1673 mark_inode_dirty(inode);
1680 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1684 run_deallocate(sbi, &ni->file.run, false);
1687 clear_rec_inuse(rec);
1689 ni->mi.dirty = false;
1690 discard_new_inode(inode);
1692 ntfs_mark_rec_free(sbi, ino, false);
1703 return ERR_PTR(err);
1705 unlock_new_inode(inode);
1710 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1713 struct ntfs_inode *ni = ntfs_i(inode);
1714 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1717 /* Allocate PATH_MAX bytes. */
1722 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1723 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1725 /* Construct 'de'. */
1726 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1730 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1739 * inode_operations::unlink
1740 * inode_operations::rmdir
1742 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1745 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1746 struct inode *inode = d_inode(dentry);
1747 struct ntfs_inode *ni = ntfs_i(inode);
1748 struct ntfs_inode *dir_ni = ntfs_i(dir);
1749 struct NTFS_DE *de, *de2 = NULL;
1752 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1755 /* Allocate PATH_MAX bytes. */
1762 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1767 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1772 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1776 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1777 mark_inode_dirty(dir);
1778 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1780 mark_inode_dirty(inode);
1781 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1782 _ntfs_bad_inode(inode);
1784 if (ni_is_dirty(dir))
1785 mark_inode_dirty(dir);
1786 if (ni_is_dirty(inode))
1787 mark_inode_dirty(inode);
1796 void ntfs_evict_inode(struct inode *inode)
1798 truncate_inode_pages_final(&inode->i_data);
1800 invalidate_inode_buffers(inode);
1803 ni_clear(ntfs_i(inode));
1807 * ntfs_translate_junction
1809 * Translate a Windows junction target to the Linux equivalent.
1810 * On junctions, targets are always absolute (they include the drive
1811 * letter). We have no way of knowing if the target is for the current
1812 * mounted device or not so we just assume it is.
1814 static int ntfs_translate_junction(const struct super_block *sb,
1815 const struct dentry *link_de, char *target,
1816 int target_len, int target_max)
1818 int tl_len, err = target_len;
1819 char *link_path_buffer = NULL, *link_path;
1820 char *translated = NULL;
1824 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1825 if (!link_path_buffer) {
1829 /* Get link path, relative to mount point */
1830 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1831 if (IS_ERR(link_path)) {
1832 ntfs_err(sb, "Error getting link path");
1837 translated = kmalloc(PATH_MAX, GFP_NOFS);
1843 /* Make translated path a relative path to mount point */
1844 strcpy(translated, "./");
1845 ++link_path; /* Skip leading / */
1846 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1847 if (*link_path == '/') {
1848 if (PATH_MAX - tl_len < sizeof("../")) {
1850 "Link path %s has too many components",
1855 strcpy(translated + tl_len, "../");
1856 tl_len += sizeof("../") - 1;
1860 /* Skip drive letter */
1861 target_start = target;
1862 while (*target_start && *target_start != ':')
1865 if (!*target_start) {
1866 ntfs_err(sb, "Link target (%s) missing drive separator",
1872 /* Skip drive separator and leading /, if exists */
1873 target_start += 1 + (target_start[1] == '/');
1874 copy_len = target_len - (target_start - target);
1876 if (PATH_MAX - tl_len <= copy_len) {
1877 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1878 target_start, PATH_MAX - tl_len, copy_len);
1883 /* translated path has a trailing / and target_start does not */
1884 strcpy(translated + tl_len, target_start);
1886 if (target_max <= tl_len) {
1887 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1888 translated, target_max, tl_len);
1892 strcpy(target, translated);
1896 kfree(link_path_buffer);
1901 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1902 struct inode *inode, char *buffer,
1905 int i, err = -EINVAL;
1906 struct ntfs_inode *ni = ntfs_i(inode);
1907 struct super_block *sb = inode->i_sb;
1908 struct ntfs_sb_info *sbi = sb->s_fs_info;
1911 void *to_free = NULL;
1912 struct REPARSE_DATA_BUFFER *rp;
1913 const __le16 *uname;
1914 struct ATTRIB *attr;
1916 /* Reparse data present. Try to parse it. */
1917 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1918 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1922 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1926 if (!attr->non_res) {
1927 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1930 size = le32_to_cpu(attr->res.data_size);
1932 size = le64_to_cpu(attr->nres.data_size);
1936 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1940 rp = kmalloc(size, GFP_NOFS);
1946 /* Read into temporal buffer. */
1947 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1952 /* Microsoft Tag. */
1953 switch (rp->ReparseTag) {
1954 case IO_REPARSE_TAG_MOUNT_POINT:
1955 /* Mount points and junctions. */
1956 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1957 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1958 MountPointReparseBuffer.PathBuffer))
1961 offsetof(struct REPARSE_DATA_BUFFER,
1962 MountPointReparseBuffer.PathBuffer) +
1963 le16_to_cpu(rp->MountPointReparseBuffer
1965 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1968 case IO_REPARSE_TAG_SYMLINK:
1969 /* FolderSymbolicLink */
1970 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1971 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1972 SymbolicLinkReparseBuffer.PathBuffer))
1975 rp, offsetof(struct REPARSE_DATA_BUFFER,
1976 SymbolicLinkReparseBuffer.PathBuffer) +
1977 le16_to_cpu(rp->SymbolicLinkReparseBuffer
1980 rp->SymbolicLinkReparseBuffer.PrintNameLength);
1983 case IO_REPARSE_TAG_CLOUD:
1984 case IO_REPARSE_TAG_CLOUD_1:
1985 case IO_REPARSE_TAG_CLOUD_2:
1986 case IO_REPARSE_TAG_CLOUD_3:
1987 case IO_REPARSE_TAG_CLOUD_4:
1988 case IO_REPARSE_TAG_CLOUD_5:
1989 case IO_REPARSE_TAG_CLOUD_6:
1990 case IO_REPARSE_TAG_CLOUD_7:
1991 case IO_REPARSE_TAG_CLOUD_8:
1992 case IO_REPARSE_TAG_CLOUD_9:
1993 case IO_REPARSE_TAG_CLOUD_A:
1994 case IO_REPARSE_TAG_CLOUD_B:
1995 case IO_REPARSE_TAG_CLOUD_C:
1996 case IO_REPARSE_TAG_CLOUD_D:
1997 case IO_REPARSE_TAG_CLOUD_E:
1998 case IO_REPARSE_TAG_CLOUD_F:
1999 err = sizeof("OneDrive") - 1;
2002 memcpy(buffer, "OneDrive", err);
2006 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2007 /* Unknown Microsoft Tag. */
2010 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2011 size <= sizeof(struct REPARSE_POINT)) {
2016 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2017 ulen = le16_to_cpu(rp->ReparseDataLength) -
2018 sizeof(struct REPARSE_POINT);
2021 /* Convert nlen from bytes to UNICODE chars. */
2024 /* Check that name is available. */
2025 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2028 /* If name is already zero terminated then truncate it now. */
2029 if (!uname[ulen - 1])
2032 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2037 /* Translate Windows '\' into Linux '/'. */
2038 for (i = 0; i < err; i++) {
2039 if (buffer[i] == '\\')
2043 /* Always set last zero. */
2046 /* If this is a junction, translate the link target. */
2047 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2048 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2055 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2056 struct delayed_call *done)
2062 return ERR_PTR(-ECHILD);
2064 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2066 return ERR_PTR(-ENOMEM);
2068 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2071 return ERR_PTR(err);
2074 set_delayed_call(done, kfree_link, ret);
2080 const struct inode_operations ntfs_link_inode_operations = {
2081 .get_link = ntfs_get_link,
2082 .setattr = ntfs3_setattr,
2083 .listxattr = ntfs_listxattr,
2086 const struct address_space_operations ntfs_aops = {
2087 .read_folio = ntfs_read_folio,
2088 .readahead = ntfs_readahead,
2089 .writepages = ntfs_writepages,
2090 .write_begin = ntfs_write_begin,
2091 .write_end = ntfs_write_end,
2092 .direct_IO = ntfs_direct_IO,
2094 .dirty_folio = block_dirty_folio,
2095 .migrate_folio = buffer_migrate_folio,
2096 .invalidate_folio = block_invalidate_folio,
2099 const struct address_space_operations ntfs_aops_cmpr = {
2100 .read_folio = ntfs_read_folio,
2101 .readahead = ntfs_readahead,