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
348 ni->i_valid = inode->i_size;
349 /* Clear directory bit. */
350 if (ni->ni_flags & NI_FLAG_DIR) {
351 indx_clear(&ni->dir);
352 memset(&ni->dir, 0, sizeof(ni->dir));
353 ni->ni_flags &= ~NI_FLAG_DIR;
355 run_close(&ni->file.run);
357 mode = S_IFLNK | 0777;
361 goto attr_unpack_run; // Double break.
365 case REPARSE_COMPRESSED:
368 case REPARSE_DEDUPLICATED:
374 if (!attr->name_len &&
375 resident_data_ex(attr, sizeof(struct EA_INFO))) {
376 ni->ni_flags |= NI_FLAG_EA;
378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
380 inode->i_mode = mode;
381 ntfs_get_wsl_perm(inode);
382 mode = inode->i_mode;
391 roff = le16_to_cpu(attr->nres.run_off);
398 t64 = le64_to_cpu(attr->nres.svcn);
400 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
401 t64, Add2Ptr(attr, roff), asize - roff);
412 if (!is_match && name) {
417 if (std5->fa & FILE_ATTRIBUTE_READONLY)
425 if (names != le16_to_cpu(rec->hard_links)) {
426 /* Correct minor error on the fly. Do not mark inode as dirty. */
427 ntfs_inode_warn(inode, "Correct links count -> %u.", names);
428 rec->hard_links = cpu_to_le16(names);
432 set_nlink(inode, names);
435 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
438 * Dot and dot-dot should be included in count but was not
439 * included in enumeration.
440 * Usually a hard links to directories are disabled.
442 inode->i_op = &ntfs_dir_inode_operations;
443 if (is_legacy_ntfs(inode->i_sb))
444 inode->i_fop = &ntfs_legacy_dir_operations;
446 inode->i_fop = &ntfs_dir_operations;
448 } else if (S_ISLNK(mode)) {
449 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
450 inode->i_op = &ntfs_link_inode_operations;
452 inode_nohighmem(inode);
453 } else if (S_ISREG(mode)) {
454 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
455 inode->i_op = &ntfs_file_inode_operations;
456 if (is_legacy_ntfs(inode->i_sb))
457 inode->i_fop = &ntfs_legacy_file_operations;
459 inode->i_fop = &ntfs_file_operations;
460 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
462 if (ino != MFT_REC_MFT)
463 init_rwsem(&ni->file.run_lock);
464 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
466 inode->i_op = &ntfs_special_inode_operations;
467 init_special_inode(inode, mode, inode->i_rdev);
468 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
469 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
470 /* Records in $Extend are not a files or general directories. */
471 inode->i_op = &ntfs_file_inode_operations;
477 if ((sbi->options->sys_immutable &&
478 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
479 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
480 inode->i_flags |= S_IMMUTABLE;
482 inode->i_flags &= ~S_IMMUTABLE;
485 inode->i_mode = mode;
486 if (!(ni->ni_flags & NI_FLAG_EA)) {
487 /* If no xattr then no security (stored in xattr). */
488 inode->i_flags |= S_NOSEC;
491 if (ino == MFT_REC_MFT && !sb->s_root)
494 unlock_new_inode(inode);
499 if (ino == MFT_REC_MFT && !sb->s_root)
509 * Return: 1 if match.
511 static int ntfs_test_inode(struct inode *inode, void *data)
513 struct MFT_REF *ref = data;
515 return ino_get(ref) == inode->i_ino;
518 static int ntfs_set_inode(struct inode *inode, void *data)
520 const struct MFT_REF *ref = data;
522 inode->i_ino = ino_get(ref);
526 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
527 const struct cpu_str *name)
531 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
533 if (unlikely(!inode))
534 return ERR_PTR(-ENOMEM);
536 /* If this is a freshly allocated inode, need to read it now. */
537 if (inode->i_state & I_NEW)
538 inode = ntfs_read_mft(inode, name, ref);
539 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
540 /* Inode overlaps? */
541 _ntfs_bad_inode(inode);
544 if (IS_ERR(inode) && name)
545 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
551 GET_BLOCK_GENERAL = 0,
552 GET_BLOCK_WRITE_BEGIN = 1,
553 GET_BLOCK_DIRECT_IO_R = 2,
554 GET_BLOCK_DIRECT_IO_W = 3,
558 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
559 struct buffer_head *bh, int create,
560 enum get_block_ctx ctx)
562 struct super_block *sb = inode->i_sb;
563 struct ntfs_sb_info *sbi = sb->s_fs_info;
564 struct ntfs_inode *ni = ntfs_i(inode);
565 struct folio *folio = bh->b_folio;
566 u8 cluster_bits = sbi->cluster_bits;
567 u32 block_size = sb->s_blocksize;
568 u64 bytes, lbo, valid;
574 /* Clear previous state. */
575 clear_buffer_new(bh);
576 clear_buffer_uptodate(bh);
578 if (is_resident(ni)) {
580 err = attr_data_read_resident(ni, &folio->page);
584 set_buffer_uptodate(bh);
585 bh->b_size = block_size;
589 vcn = vbo >> cluster_bits;
590 off = vbo & sbi->cluster_mask;
593 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
594 create && sbi->cluster_size > PAGE_SIZE);
601 bytes = ((u64)len << cluster_bits) - off;
603 if (lcn == SPARSE_LCN) {
605 if (bh->b_size > bytes)
615 lbo = ((u64)lcn << cluster_bits) + off;
617 set_buffer_mapped(bh);
618 bh->b_bdev = sb->s_bdev;
619 bh->b_blocknr = lbo >> sb->s_blocksize_bits;
623 if (ctx == GET_BLOCK_DIRECT_IO_W) {
624 /* ntfs_direct_IO will update ni->i_valid. */
629 if (bytes > bh->b_size)
635 if (vbo + bytes > valid) {
636 ni->i_valid = vbo + bytes;
637 mark_inode_dirty(inode);
639 } else if (vbo >= valid) {
640 /* Read out of valid data. */
641 clear_buffer_mapped(bh);
642 } else if (vbo + bytes <= valid) {
644 } else if (vbo + block_size <= valid) {
645 /* Normal short read. */
649 * Read across valid size: vbo < valid && valid < vbo + block_size
654 u32 voff = valid - vbo;
656 bh->b_size = block_size;
657 off = vbo & (PAGE_SIZE - 1);
658 folio_set_bh(bh, folio, off);
660 if (bh_read(bh, 0) < 0) {
664 folio_zero_segment(folio, off + voff, off + block_size);
668 if (bh->b_size > bytes)
672 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
673 static_assert(sizeof(size_t) < sizeof(loff_t));
674 if (bytes > 0x40000000u)
675 bh->b_size = 0x40000000u;
685 int ntfs_get_block(struct inode *inode, sector_t vbn,
686 struct buffer_head *bh_result, int create)
688 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
689 bh_result, create, GET_BLOCK_GENERAL);
692 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
693 struct buffer_head *bh_result, int create)
695 return ntfs_get_block_vbo(inode,
696 (u64)vsn << inode->i_sb->s_blocksize_bits,
697 bh_result, create, GET_BLOCK_BMAP);
700 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
702 return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
705 static int ntfs_read_folio(struct file *file, struct folio *folio)
707 struct page *page = &folio->page;
709 struct address_space *mapping = page->mapping;
710 struct inode *inode = mapping->host;
711 struct ntfs_inode *ni = ntfs_i(inode);
713 if (is_resident(ni)) {
715 err = attr_data_read_resident(ni, page);
717 if (err != E_NTFS_NONRESIDENT) {
723 if (is_compressed(ni)) {
725 err = ni_readpage_cmpr(ni, page);
730 /* Normal + sparse files. */
731 return mpage_read_folio(folio, ntfs_get_block);
734 static void ntfs_readahead(struct readahead_control *rac)
736 struct address_space *mapping = rac->mapping;
737 struct inode *inode = mapping->host;
738 struct ntfs_inode *ni = ntfs_i(inode);
742 if (is_resident(ni)) {
743 /* No readahead for resident. */
747 if (is_compressed(ni)) {
748 /* No readahead for compressed. */
753 pos = readahead_pos(rac);
755 if (valid < i_size_read(inode) && pos <= valid &&
756 valid < pos + readahead_length(rac)) {
757 /* Range cross 'valid'. Read it page by page. */
761 mpage_readahead(rac, ntfs_get_block);
764 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
765 struct buffer_head *bh_result, int create)
767 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
768 bh_result, create, GET_BLOCK_DIRECT_IO_R);
771 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
772 struct buffer_head *bh_result, int create)
774 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
775 bh_result, create, GET_BLOCK_DIRECT_IO_W);
778 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
780 struct file *file = iocb->ki_filp;
781 struct address_space *mapping = file->f_mapping;
782 struct inode *inode = mapping->host;
783 struct ntfs_inode *ni = ntfs_i(inode);
784 loff_t vbo = iocb->ki_pos;
786 int wr = iov_iter_rw(iter) & WRITE;
787 size_t iter_count = iov_iter_count(iter);
791 if (is_resident(ni)) {
792 /* Switch to buffered write. */
797 ret = blockdev_direct_IO(iocb, inode, iter,
798 wr ? ntfs_get_block_direct_IO_W :
799 ntfs_get_block_direct_IO_R);
803 else if (wr && ret == -EIOCBQUEUED)
804 end = vbo + iter_count;
810 if (end > valid && !S_ISBLK(inode->i_mode)) {
812 mark_inode_dirty(inode);
814 } else if (vbo < valid && valid < end) {
816 iov_iter_revert(iter, end - valid);
817 iov_iter_zero(end - valid, iter);
824 int ntfs_set_size(struct inode *inode, u64 new_size)
826 struct super_block *sb = inode->i_sb;
827 struct ntfs_sb_info *sbi = sb->s_fs_info;
828 struct ntfs_inode *ni = ntfs_i(inode);
831 /* Check for maximum file size. */
832 if (is_sparsed(ni) || is_compressed(ni)) {
833 if (new_size > sbi->maxbytes_sparse) {
837 } else if (new_size > sbi->maxbytes) {
843 down_write(&ni->file.run_lock);
845 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
846 &ni->i_valid, true, NULL);
848 up_write(&ni->file.run_lock);
851 mark_inode_dirty(inode);
857 static int ntfs_resident_writepage(struct folio *folio,
858 struct writeback_control *wbc, void *data)
860 struct address_space *mapping = data;
861 struct inode *inode = mapping->host;
862 struct ntfs_inode *ni = ntfs_i(inode);
865 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
869 ret = attr_data_write_resident(ni, &folio->page);
872 if (ret != E_NTFS_NONRESIDENT)
874 mapping_set_error(mapping, ret);
878 static int ntfs_writepages(struct address_space *mapping,
879 struct writeback_control *wbc)
881 struct inode *inode = mapping->host;
883 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
886 if (is_resident(ntfs_i(inode)))
887 return write_cache_pages(mapping, wbc, ntfs_resident_writepage,
889 return mpage_writepages(mapping, wbc, ntfs_get_block);
892 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
893 struct buffer_head *bh_result, int create)
895 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
896 bh_result, create, GET_BLOCK_WRITE_BEGIN);
899 int ntfs_write_begin(struct file *file, struct address_space *mapping,
900 loff_t pos, u32 len, struct page **pagep, void **fsdata)
903 struct inode *inode = mapping->host;
904 struct ntfs_inode *ni = ntfs_i(inode);
906 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
910 if (is_resident(ni)) {
912 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT);
920 err = attr_data_read_resident(ni, page);
930 if (err != E_NTFS_NONRESIDENT)
934 err = block_write_begin(mapping, pos, len, pagep,
935 ntfs_get_block_write_begin);
942 * ntfs_write_end - Address_space_operations::write_end.
944 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos,
945 u32 len, u32 copied, struct page *page, void *fsdata)
947 struct inode *inode = mapping->host;
948 struct ntfs_inode *ni = ntfs_i(inode);
949 u64 valid = ni->i_valid;
953 if (is_resident(ni)) {
955 err = attr_data_write_resident(ni, page);
959 /* Clear any buffers in page. */
960 if (page_has_buffers(page)) {
961 struct buffer_head *head, *bh;
963 bh = head = page_buffers(page);
965 clear_buffer_dirty(bh);
966 clear_buffer_mapped(bh);
967 set_buffer_uptodate(bh);
968 } while (head != (bh = bh->b_this_page));
970 SetPageUptodate(page);
976 err = generic_write_end(file, mapping, pos, len, copied, page,
981 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
982 inode_set_mtime_to_ts(inode,
983 inode_set_ctime_current(inode));
984 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
988 if (valid != ni->i_valid) {
989 /* ni->i_valid is changed in ntfs_get_block_vbo. */
993 if (pos + err > inode->i_size) {
994 i_size_write(inode, pos + err);
999 mark_inode_dirty(inode);
1005 int reset_log_file(struct inode *inode)
1009 u32 log_size = inode->i_size;
1010 struct address_space *mapping = inode->i_mapping;
1017 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
1019 err = block_write_begin(mapping, pos, len, &page,
1020 ntfs_get_block_write_begin);
1024 kaddr = kmap_atomic(page);
1025 memset(kaddr, -1, len);
1026 kunmap_atomic(kaddr);
1027 flush_dcache_page(page);
1029 err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
1034 if (pos >= log_size)
1036 balance_dirty_pages_ratelimited(mapping);
1039 mark_inode_dirty_sync(inode);
1044 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1046 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1049 int ntfs_sync_inode(struct inode *inode)
1051 return _ni_write_inode(inode, 1);
1055 * writeback_inode - Helper function for ntfs_flush_inodes().
1057 * This writes both the inode and the file data blocks, waiting
1058 * for in flight data blocks before the start of the call. It
1059 * does not wait for any io started during the call.
1061 static int writeback_inode(struct inode *inode)
1063 int ret = sync_inode_metadata(inode, 0);
1066 ret = filemap_fdatawrite(inode->i_mapping);
1073 * Write data and metadata corresponding to i1 and i2. The io is
1074 * started but we do not wait for any of it to finish.
1076 * filemap_flush() is used for the block device, so if there is a dirty
1077 * page for a block already in flight, we will not wait and start the
1080 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
1086 ret = writeback_inode(i1);
1088 ret = writeback_inode(i2);
1090 ret = sync_blockdev_nowait(sb->s_bdev);
1094 int inode_write_data(struct inode *inode, const void *data, size_t bytes)
1098 /* Write non resident data. */
1099 for (idx = 0; bytes; idx++) {
1100 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1101 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1104 return PTR_ERR(page);
1107 WARN_ON(!PageUptodate(page));
1108 ClearPageUptodate(page);
1110 memcpy(page_address(page), data, op);
1112 flush_dcache_page(page);
1113 SetPageUptodate(page);
1116 ntfs_unmap_page(page);
1119 data = Add2Ptr(data, PAGE_SIZE);
1125 * ntfs_reparse_bytes
1127 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1128 * for unicode string of @uni_len length.
1130 static inline u32 ntfs_reparse_bytes(u32 uni_len)
1132 /* Header + unicode string + decorated unicode string. */
1133 return sizeof(short) * (2 * uni_len + 4) +
1134 offsetof(struct REPARSE_DATA_BUFFER,
1135 SymbolicLinkReparseBuffer.PathBuffer);
1138 static struct REPARSE_DATA_BUFFER *
1139 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1140 u32 size, u16 *nsize)
1143 struct REPARSE_DATA_BUFFER *rp;
1145 typeof(rp->SymbolicLinkReparseBuffer) *rs;
1147 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1149 return ERR_PTR(-ENOMEM);
1151 rs = &rp->SymbolicLinkReparseBuffer;
1152 rp_name = rs->PathBuffer;
1154 /* Convert link name to UTF-16. */
1155 err = ntfs_nls_to_utf16(sbi, symname, size,
1156 (struct cpu_str *)(rp_name - 1), 2 * size,
1157 UTF16_LITTLE_ENDIAN);
1161 /* err = the length of unicode name of symlink. */
1162 *nsize = ntfs_reparse_bytes(err);
1164 if (*nsize > sbi->reparse.max_size) {
1169 /* Translate Linux '/' into Windows '\'. */
1170 for (i = 0; i < err; i++) {
1171 if (rp_name[i] == cpu_to_le16('/'))
1172 rp_name[i] = cpu_to_le16('\\');
1175 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1176 rp->ReparseDataLength =
1177 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1178 SymbolicLinkReparseBuffer));
1180 /* PrintName + SubstituteName. */
1181 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1182 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
1183 rs->PrintNameLength = rs->SubstituteNameOffset;
1186 * TODO: Use relative path if possible to allow Windows to
1188 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1192 memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
1194 /* Decorate SubstituteName. */
1196 rp_name[0] = cpu_to_le16('\\');
1197 rp_name[1] = cpu_to_le16('?');
1198 rp_name[2] = cpu_to_le16('?');
1199 rp_name[3] = cpu_to_le16('\\');
1204 return ERR_PTR(err);
1210 * Helper function for:
1215 * - ntfs_atomic_open
1217 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1219 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1220 struct dentry *dentry,
1221 const struct cpu_str *uni, umode_t mode,
1222 dev_t dev, const char *symname, u32 size,
1223 struct ntfs_fnd *fnd)
1226 struct super_block *sb = dir->i_sb;
1227 struct ntfs_sb_info *sbi = sb->s_fs_info;
1228 const struct qstr *name = &dentry->d_name;
1230 struct ntfs_inode *dir_ni = ntfs_i(dir);
1231 struct ntfs_inode *ni = NULL;
1232 struct inode *inode = NULL;
1233 struct ATTRIB *attr;
1234 struct ATTR_STD_INFO5 *std5;
1235 struct ATTR_FILE_NAME *fname;
1236 struct MFT_REC *rec;
1237 u32 asize, dsize, sd_size;
1238 enum FILE_ATTRIBUTE fa;
1239 __le32 security_id = SECURITY_ID_INVALID;
1242 u16 t16, nsize = 0, aid = 0;
1243 struct INDEX_ROOT *root, *dir_root;
1244 struct NTFS_DE *e, *new_de = NULL;
1245 struct REPARSE_DATA_BUFFER *rp = NULL;
1246 bool rp_inserted = false;
1249 ni_lock_dir(dir_ni);
1251 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1257 if (S_ISDIR(mode)) {
1258 /* Use parent's directory attributes. */
1259 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1260 FILE_ATTRIBUTE_ARCHIVE;
1262 * By default child directory inherits parent attributes.
1263 * Root directory is hidden + system.
1264 * Make an exception for children in root.
1266 if (dir->i_ino == MFT_REC_ROOT)
1267 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1268 } else if (S_ISLNK(mode)) {
1269 /* It is good idea that link should be the same type (file/dir) as target */
1270 fa = FILE_ATTRIBUTE_REPARSE_POINT;
1273 * Linux: there are dir/file/symlink and so on.
1274 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1275 * It is good idea to create:
1276 * dir + reparse if 'symname' points to directory
1278 * file + reparse if 'symname' points to file
1279 * Unfortunately kern_path hangs if symname contains 'dir'.
1285 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1286 * struct inode *target = d_inode(path.dentry);
1288 * if (S_ISDIR(target->i_mode))
1289 * fa |= FILE_ATTRIBUTE_DIRECTORY;
1290 * // if ( target->i_sb == sb ){
1291 * // use relative path?
1296 } else if (S_ISREG(mode)) {
1297 if (sbi->options->sparse) {
1298 /* Sparsed regular file, cause option 'sparse'. */
1299 fa = FILE_ATTRIBUTE_SPARSE_FILE |
1300 FILE_ATTRIBUTE_ARCHIVE;
1301 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1302 /* Compressed regular file, if parent is compressed. */
1303 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1305 /* Regular file, default attributes. */
1306 fa = FILE_ATTRIBUTE_ARCHIVE;
1309 fa = FILE_ATTRIBUTE_ARCHIVE;
1312 /* If option "hide_dot_files" then set hidden attribute for dot files. */
1313 if (sbi->options->hide_dot_files && name->name[0] == '.')
1314 fa |= FILE_ATTRIBUTE_HIDDEN;
1317 fa |= FILE_ATTRIBUTE_READONLY;
1319 /* Allocate PATH_MAX bytes. */
1320 new_de = __getname();
1326 if (unlikely(ntfs3_forced_shutdown(sb))) {
1331 /* Mark rw ntfs as dirty. it will be cleared at umount. */
1332 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1334 /* Step 1: allocate and fill new mft record. */
1335 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1339 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1345 inode = &ni->vfs_inode;
1346 inode_init_owner(idmap, inode, dir, mode);
1347 mode = inode->i_mode;
1349 ni->i_crtime = current_time(inode);
1352 rec->hard_links = cpu_to_le16(1);
1353 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1355 /* Get default security id. */
1356 sd = s_default_security;
1357 sd_size = sizeof(s_default_security);
1359 if (is_ntfs3(sbi)) {
1360 security_id = dir_ni->std_security_id;
1361 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1362 security_id = sbi->security.def_security_id;
1364 if (security_id == SECURITY_ID_INVALID &&
1365 !ntfs_insert_security(sbi, sd, sd_size,
1366 &security_id, NULL))
1367 sbi->security.def_security_id = security_id;
1371 /* Insert standard info. */
1372 std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1374 if (security_id == SECURITY_ID_INVALID) {
1375 dsize = sizeof(struct ATTR_STD_INFO);
1377 dsize = sizeof(struct ATTR_STD_INFO5);
1378 std5->security_id = security_id;
1379 ni->std_security_id = security_id;
1381 asize = SIZEOF_RESIDENT + dsize;
1383 attr->type = ATTR_STD;
1384 attr->size = cpu_to_le32(asize);
1385 attr->id = cpu_to_le16(aid++);
1386 attr->res.data_off = SIZEOF_RESIDENT_LE;
1387 attr->res.data_size = cpu_to_le32(dsize);
1389 std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1390 kernel2nt(&ni->i_crtime);
1392 std5->fa = ni->std_fa = fa;
1394 attr = Add2Ptr(attr, asize);
1396 /* Insert file name. */
1397 err = fill_name_de(sbi, new_de, name, uni);
1401 mi_get_ref(&ni->mi, &new_de->ref);
1403 fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1405 if (sbi->options->windows_names &&
1406 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1411 mi_get_ref(&dir_ni->mi, &fname->home);
1412 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1413 fname->dup.a_time = std5->cr_time;
1414 fname->dup.alloc_size = fname->dup.data_size = 0;
1415 fname->dup.fa = std5->fa;
1416 fname->dup.ea_size = fname->dup.reparse = 0;
1418 dsize = le16_to_cpu(new_de->key_size);
1419 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1421 attr->type = ATTR_NAME;
1422 attr->size = cpu_to_le32(asize);
1423 attr->res.data_off = SIZEOF_RESIDENT_LE;
1424 attr->res.flags = RESIDENT_FLAG_INDEXED;
1425 attr->id = cpu_to_le16(aid++);
1426 attr->res.data_size = cpu_to_le32(dsize);
1427 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1429 attr = Add2Ptr(attr, asize);
1431 if (security_id == SECURITY_ID_INVALID) {
1432 /* Insert security attribute. */
1433 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1435 attr->type = ATTR_SECURE;
1436 attr->size = cpu_to_le32(asize);
1437 attr->id = cpu_to_le16(aid++);
1438 attr->res.data_off = SIZEOF_RESIDENT_LE;
1439 attr->res.data_size = cpu_to_le32(sd_size);
1440 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1442 attr = Add2Ptr(attr, asize);
1445 attr->id = cpu_to_le16(aid++);
1446 if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1448 * Regular directory or symlink to directory.
1449 * Create root attribute.
1451 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1452 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1454 attr->type = ATTR_ROOT;
1455 attr->size = cpu_to_le32(asize);
1457 attr->name_len = ARRAY_SIZE(I30_NAME);
1458 attr->name_off = SIZEOF_RESIDENT_LE;
1459 attr->res.data_off =
1460 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1461 attr->res.data_size = cpu_to_le32(dsize);
1462 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1465 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1466 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1467 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1468 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1469 sizeof(struct NTFS_DE));
1470 root->ihdr.total = root->ihdr.used;
1472 e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1473 e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1474 e->flags = NTFS_IE_LAST;
1475 } else if (S_ISLNK(mode)) {
1478 * Create empty resident data attribute.
1480 asize = SIZEOF_RESIDENT;
1482 /* Insert empty ATTR_DATA */
1483 attr->type = ATTR_DATA;
1484 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1485 attr->name_off = SIZEOF_RESIDENT_LE;
1486 attr->res.data_off = SIZEOF_RESIDENT_LE;
1487 } else if (S_ISREG(mode)) {
1489 * Regular file. Create empty non resident data attribute.
1491 attr->type = ATTR_DATA;
1493 attr->nres.evcn = cpu_to_le64(-1ll);
1494 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1495 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1496 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1497 attr->flags = ATTR_FLAG_SPARSED;
1498 asize = SIZEOF_NONRESIDENT_EX + 8;
1499 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1500 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1501 attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1502 attr->flags = ATTR_FLAG_COMPRESSED;
1503 attr->nres.c_unit = COMPRESSION_UNIT;
1504 asize = SIZEOF_NONRESIDENT_EX + 8;
1506 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1507 attr->name_off = SIZEOF_NONRESIDENT_LE;
1508 asize = SIZEOF_NONRESIDENT + 8;
1510 attr->nres.run_off = attr->name_off;
1513 * Node. Create empty resident data attribute.
1515 attr->type = ATTR_DATA;
1516 attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1517 attr->name_off = SIZEOF_RESIDENT_LE;
1518 if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1519 attr->flags = ATTR_FLAG_SPARSED;
1520 else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1521 attr->flags = ATTR_FLAG_COMPRESSED;
1522 attr->res.data_off = SIZEOF_RESIDENT_LE;
1523 asize = SIZEOF_RESIDENT;
1524 ni->ni_flags |= NI_FLAG_RESIDENT;
1527 if (S_ISDIR(mode)) {
1528 ni->ni_flags |= NI_FLAG_DIR;
1529 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1532 } else if (S_ISLNK(mode)) {
1533 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1542 * Insert ATTR_REPARSE.
1544 attr = Add2Ptr(attr, asize);
1545 attr->type = ATTR_REPARSE;
1546 attr->id = cpu_to_le16(aid++);
1548 /* Resident or non resident? */
1549 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1550 t16 = PtrOffset(rec, attr);
1553 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1554 * It is good idea to keep extened attributes resident.
1556 if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1558 CLST clst = bytes_to_cluster(sbi, nsize);
1560 /* Bytes per runs. */
1561 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1564 attr->nres.evcn = cpu_to_le64(clst - 1);
1565 attr->name_off = SIZEOF_NONRESIDENT_LE;
1566 attr->nres.run_off = attr->name_off;
1567 attr->nres.data_size = cpu_to_le64(nsize);
1568 attr->nres.valid_size = attr->nres.data_size;
1569 attr->nres.alloc_size =
1570 cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1572 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1573 clst, NULL, ALLOCATE_DEF,
1574 &alen, 0, NULL, NULL);
1578 err = run_pack(&ni->file.run, 0, clst,
1579 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1589 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1590 /* Write non resident data. */
1591 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1596 attr->res.data_off = SIZEOF_RESIDENT_LE;
1597 attr->res.data_size = cpu_to_le32(nsize);
1598 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1600 /* Size of symlink equals the length of input string. */
1601 inode->i_size = size;
1603 attr->size = cpu_to_le32(asize);
1605 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1613 attr = Add2Ptr(attr, asize);
1614 attr->type = ATTR_END;
1616 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1617 rec->next_attr_id = cpu_to_le16(aid);
1619 inode->i_generation = le16_to_cpu(rec->seq);
1621 if (S_ISDIR(mode)) {
1622 inode->i_op = &ntfs_dir_inode_operations;
1623 if (is_legacy_ntfs(inode->i_sb))
1624 inode->i_fop = &ntfs_legacy_dir_operations;
1626 inode->i_fop = &ntfs_dir_operations;
1627 } else if (S_ISLNK(mode)) {
1628 inode->i_op = &ntfs_link_inode_operations;
1629 inode->i_fop = NULL;
1630 inode->i_mapping->a_ops = &ntfs_aops;
1631 inode->i_size = size;
1632 inode_nohighmem(inode);
1633 } else if (S_ISREG(mode)) {
1634 inode->i_op = &ntfs_file_inode_operations;
1635 if (is_legacy_ntfs(inode->i_sb))
1636 inode->i_fop = &ntfs_legacy_file_operations;
1638 inode->i_fop = &ntfs_file_operations;
1639 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1641 init_rwsem(&ni->file.run_lock);
1643 inode->i_op = &ntfs_special_inode_operations;
1644 init_special_inode(inode, mode, dev);
1647 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1648 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1649 err = ntfs_init_acl(idmap, inode, dir);
1655 inode->i_flags |= S_NOSEC;
1659 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1660 * The packed size of extended attribute is stored in direntry too.
1661 * 'fname' here points to inside new_de.
1663 ntfs_save_wsl_perm(inode, &fname->dup.ea_size);
1666 * update ea_size in file_name attribute too.
1667 * Use ni_find_attr cause layout of MFT record may be changed
1668 * in ntfs_init_acl and ntfs_save_wsl_perm.
1670 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL);
1672 struct ATTR_FILE_NAME *fn;
1674 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1676 fn->dup.ea_size = fname->dup.ea_size;
1679 /* We do not need to update parent directory later */
1680 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1682 /* Step 2: Add new name in index. */
1683 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1688 * Call 'd_instantiate' after inode->i_op is set
1689 * but before finish_open.
1691 d_instantiate(dentry, inode);
1693 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */
1694 inode_set_atime_to_ts(inode, ni->i_crtime);
1695 inode_set_ctime_to_ts(inode, ni->i_crtime);
1696 inode_set_mtime_to_ts(inode, ni->i_crtime);
1697 inode_set_mtime_to_ts(dir, ni->i_crtime);
1698 inode_set_ctime_to_ts(dir, ni->i_crtime);
1700 mark_inode_dirty(dir);
1701 mark_inode_dirty(inode);
1708 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1712 run_deallocate(sbi, &ni->file.run, false);
1715 clear_rec_inuse(rec);
1717 ni->mi.dirty = false;
1718 discard_new_inode(inode);
1720 ntfs_mark_rec_free(sbi, ino, false);
1731 return ERR_PTR(err);
1733 unlock_new_inode(inode);
1738 int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1741 struct ntfs_inode *ni = ntfs_i(inode);
1742 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1745 /* Allocate PATH_MAX bytes. */
1750 /* Mark rw ntfs as dirty. It will be cleared at umount. */
1751 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1753 /* Construct 'de'. */
1754 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1758 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1767 * inode_operations::unlink
1768 * inode_operations::rmdir
1770 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1773 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1774 struct inode *inode = d_inode(dentry);
1775 struct ntfs_inode *ni = ntfs_i(inode);
1776 struct ntfs_inode *dir_ni = ntfs_i(dir);
1777 struct NTFS_DE *de, *de2 = NULL;
1780 if (ntfs_is_meta_file(sbi, ni->mi.rno))
1783 /* Allocate PATH_MAX bytes. */
1790 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1795 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1800 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1804 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1805 mark_inode_dirty(dir);
1806 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1808 mark_inode_dirty(inode);
1809 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1810 _ntfs_bad_inode(inode);
1812 if (ni_is_dirty(dir))
1813 mark_inode_dirty(dir);
1814 if (ni_is_dirty(inode))
1815 mark_inode_dirty(inode);
1824 void ntfs_evict_inode(struct inode *inode)
1826 truncate_inode_pages_final(&inode->i_data);
1828 invalidate_inode_buffers(inode);
1831 ni_clear(ntfs_i(inode));
1835 * ntfs_translate_junction
1837 * Translate a Windows junction target to the Linux equivalent.
1838 * On junctions, targets are always absolute (they include the drive
1839 * letter). We have no way of knowing if the target is for the current
1840 * mounted device or not so we just assume it is.
1842 static int ntfs_translate_junction(const struct super_block *sb,
1843 const struct dentry *link_de, char *target,
1844 int target_len, int target_max)
1846 int tl_len, err = target_len;
1847 char *link_path_buffer = NULL, *link_path;
1848 char *translated = NULL;
1852 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1853 if (!link_path_buffer) {
1857 /* Get link path, relative to mount point */
1858 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1859 if (IS_ERR(link_path)) {
1860 ntfs_err(sb, "Error getting link path");
1865 translated = kmalloc(PATH_MAX, GFP_NOFS);
1871 /* Make translated path a relative path to mount point */
1872 strcpy(translated, "./");
1873 ++link_path; /* Skip leading / */
1874 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1875 if (*link_path == '/') {
1876 if (PATH_MAX - tl_len < sizeof("../")) {
1878 "Link path %s has too many components",
1883 strcpy(translated + tl_len, "../");
1884 tl_len += sizeof("../") - 1;
1888 /* Skip drive letter */
1889 target_start = target;
1890 while (*target_start && *target_start != ':')
1893 if (!*target_start) {
1894 ntfs_err(sb, "Link target (%s) missing drive separator",
1900 /* Skip drive separator and leading /, if exists */
1901 target_start += 1 + (target_start[1] == '/');
1902 copy_len = target_len - (target_start - target);
1904 if (PATH_MAX - tl_len <= copy_len) {
1905 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1906 target_start, PATH_MAX - tl_len, copy_len);
1911 /* translated path has a trailing / and target_start does not */
1912 strcpy(translated + tl_len, target_start);
1914 if (target_max <= tl_len) {
1915 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1916 translated, target_max, tl_len);
1920 strcpy(target, translated);
1924 kfree(link_path_buffer);
1929 static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1930 struct inode *inode, char *buffer,
1933 int i, err = -EINVAL;
1934 struct ntfs_inode *ni = ntfs_i(inode);
1935 struct super_block *sb = inode->i_sb;
1936 struct ntfs_sb_info *sbi = sb->s_fs_info;
1939 void *to_free = NULL;
1940 struct REPARSE_DATA_BUFFER *rp;
1941 const __le16 *uname;
1942 struct ATTRIB *attr;
1944 /* Reparse data present. Try to parse it. */
1945 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1946 static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1950 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1954 if (!attr->non_res) {
1955 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1958 size = le32_to_cpu(attr->res.data_size);
1960 size = le64_to_cpu(attr->nres.data_size);
1964 if (size > sbi->reparse.max_size || size <= sizeof(u32))
1968 rp = kmalloc(size, GFP_NOFS);
1974 /* Read into temporal buffer. */
1975 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1980 /* Microsoft Tag. */
1981 switch (rp->ReparseTag) {
1982 case IO_REPARSE_TAG_MOUNT_POINT:
1983 /* Mount points and junctions. */
1984 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1985 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1986 MountPointReparseBuffer.PathBuffer))
1989 offsetof(struct REPARSE_DATA_BUFFER,
1990 MountPointReparseBuffer.PathBuffer) +
1991 le16_to_cpu(rp->MountPointReparseBuffer
1993 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1996 case IO_REPARSE_TAG_SYMLINK:
1997 /* FolderSymbolicLink */
1998 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1999 if (size <= offsetof(struct REPARSE_DATA_BUFFER,
2000 SymbolicLinkReparseBuffer.PathBuffer))
2003 rp, offsetof(struct REPARSE_DATA_BUFFER,
2004 SymbolicLinkReparseBuffer.PathBuffer) +
2005 le16_to_cpu(rp->SymbolicLinkReparseBuffer
2008 rp->SymbolicLinkReparseBuffer.PrintNameLength);
2011 case IO_REPARSE_TAG_CLOUD:
2012 case IO_REPARSE_TAG_CLOUD_1:
2013 case IO_REPARSE_TAG_CLOUD_2:
2014 case IO_REPARSE_TAG_CLOUD_3:
2015 case IO_REPARSE_TAG_CLOUD_4:
2016 case IO_REPARSE_TAG_CLOUD_5:
2017 case IO_REPARSE_TAG_CLOUD_6:
2018 case IO_REPARSE_TAG_CLOUD_7:
2019 case IO_REPARSE_TAG_CLOUD_8:
2020 case IO_REPARSE_TAG_CLOUD_9:
2021 case IO_REPARSE_TAG_CLOUD_A:
2022 case IO_REPARSE_TAG_CLOUD_B:
2023 case IO_REPARSE_TAG_CLOUD_C:
2024 case IO_REPARSE_TAG_CLOUD_D:
2025 case IO_REPARSE_TAG_CLOUD_E:
2026 case IO_REPARSE_TAG_CLOUD_F:
2027 err = sizeof("OneDrive") - 1;
2030 memcpy(buffer, "OneDrive", err);
2034 if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2035 /* Unknown Microsoft Tag. */
2038 if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2039 size <= sizeof(struct REPARSE_POINT)) {
2044 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2045 ulen = le16_to_cpu(rp->ReparseDataLength) -
2046 sizeof(struct REPARSE_POINT);
2049 /* Convert nlen from bytes to UNICODE chars. */
2052 /* Check that name is available. */
2053 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2056 /* If name is already zero terminated then truncate it now. */
2057 if (!uname[ulen - 1])
2060 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2065 /* Translate Windows '\' into Linux '/'. */
2066 for (i = 0; i < err; i++) {
2067 if (buffer[i] == '\\')
2071 /* Always set last zero. */
2074 /* If this is a junction, translate the link target. */
2075 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2076 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2083 static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2084 struct delayed_call *done)
2090 return ERR_PTR(-ECHILD);
2092 ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2094 return ERR_PTR(-ENOMEM);
2096 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2099 return ERR_PTR(err);
2102 set_delayed_call(done, kfree_link, ret);
2108 const struct inode_operations ntfs_link_inode_operations = {
2109 .get_link = ntfs_get_link,
2110 .setattr = ntfs3_setattr,
2111 .listxattr = ntfs_listxattr,
2114 const struct address_space_operations ntfs_aops = {
2115 .read_folio = ntfs_read_folio,
2116 .readahead = ntfs_readahead,
2117 .writepages = ntfs_writepages,
2118 .write_begin = ntfs_write_begin,
2119 .write_end = ntfs_write_end,
2120 .direct_IO = ntfs_direct_IO,
2122 .dirty_folio = block_dirty_folio,
2123 .migrate_folio = buffer_migrate_folio,
2124 .invalidate_folio = block_invalidate_folio,
2127 const struct address_space_operations ntfs_aops_cmpr = {
2128 .read_folio = ntfs_read_folio,
2129 .readahead = ntfs_readahead,