inode.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *
   4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
   5 *
   6 */
   7
   8#include <linux/buffer_head.h>
   9#include <linux/fs.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>
  15
  16#include "debug.h"
  17#include "ntfs.h"
  18#include "ntfs_fs.h"
  19
  20/*
  21 * ntfs_read_mft - Read record and parse MFT.
  22 */
  23static struct inode *ntfs_read_mft(struct inode *inode,
  24				   const struct cpu_str *name,
  25				   const struct MFT_REF *ref)
  26{
  27	int err = 0;
  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;
  31	mode_t mode = 0;
  32	struct ATTR_STD_INFO5 *std5 = NULL;
  33	struct ATTR_LIST_ENTRY *le;
  34	struct ATTRIB *attr;
  35	bool is_match = false;
  36	bool is_root = false;
  37	bool is_dir;
  38	unsigned long ino = inode->i_ino;
  39	u32 rp_fa = 0, asize, t32;
  40	u16 roff, rsize, names = 0, links = 0;
  41	const struct ATTR_FILE_NAME *fname = NULL;
  42	const struct INDEX_ROOT *root;
  43	struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
  44	u64 t64;
  45	struct MFT_REC *rec;
  46	struct runs_tree *run;
  47	struct timespec64 ts;
  48
  49	inode->i_op = NULL;
  50	/* Setup 'uid' and 'gid' */
  51	inode->i_uid = sbi->options->fs_uid;
  52	inode->i_gid = sbi->options->fs_gid;
  53
  54	err = mi_init(&ni->mi, sbi, ino);
  55	if (err)
  56		goto out;
  57
  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);
  61		sbi->mft.ni = ni;
  62		init_rwsem(&ni->file.run_lock);
  63
  64		if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
  65			err = -ENOMEM;
  66			goto out;
  67		}
  68	}
  69
  70	err = mi_read(&ni->mi, ino == MFT_REC_MFT);
  71
  72	if (err)
  73		goto out;
  74
  75	rec = ni->mi.mrec;
  76
  77	if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
  78		;
  79	} else if (ref->seq != rec->seq) {
  80		err = -EINVAL;
  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));
  83		goto out;
  84	} else if (!is_rec_inuse(rec)) {
  85		err = -ESTALE;
  86		ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
  87		goto out;
  88	}
  89
  90	if (le32_to_cpu(rec->total) != sbi->record_size) {
  91		/* Bad inode? */
  92		err = -EINVAL;
  93		goto out;
  94	}
  95
  96	if (!is_rec_base(rec)) {
  97		err = -EINVAL;
  98		goto out;
  99	}
 100
 101	/* Record should contain $I30 root. */
 102	is_dir = rec->flags & RECORD_FLAG_DIR;
 103
 104	/* MFT_REC_MFT is not a dir */
 105	if (is_dir && ino == MFT_REC_MFT) {
 106		err = -EINVAL;
 107		goto out;
 108	}
 109
 110	inode->i_generation = le16_to_cpu(rec->seq);
 111
 112	/* Enumerate all struct Attributes MFT. */
 113	le = NULL;
 114	attr = NULL;
 115
 116	/*
 117	 * To reduce tab pressure use goto instead of
 118	 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
 119	 */
 120next_attr:
 121	run = NULL;
 122	err = -EINVAL;
 123	attr = ni_enum_attr_ex(ni, attr, &le, NULL);
 124	if (!attr)
 125		goto end_enum;
 126
 127	if (le && le->vcn) {
 128		/* This is non primary attribute segment. Ignore if not MFT. */
 129		if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
 130			goto next_attr;
 131
 132		run = &ni->file.run;
 133		asize = le32_to_cpu(attr->size);
 134		goto attr_unpack_run;
 135	}
 136
 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);
 140
 141	/*
 142	 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'.
 143	 * There not critical to check this case again
 144	 */
 145	if (attr->name_len &&
 146	    sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) >
 147		    asize)
 148		goto out;
 149
 150	if (attr->non_res) {
 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)
 154			goto out;
 155	}
 156
 157	switch (attr->type) {
 158	case ATTR_STD:
 159		if (attr->non_res ||
 160		    asize < sizeof(struct ATTR_STD_INFO) + roff ||
 161		    rsize < sizeof(struct ATTR_STD_INFO))
 162			goto out;
 163
 164		if (std5)
 165			goto next_attr;
 166
 167		std5 = Add2Ptr(attr, roff);
 168
 169#ifdef STATX_BTIME
 170		nt2kernel(std5->cr_time, &ni->i_crtime);
 171#endif
 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);
 178
 179		ni->std_fa = std5->fa;
 180
 181		if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
 182		    rsize >= sizeof(struct ATTR_STD_INFO5))
 183			ni->std_security_id = std5->security_id;
 184		goto next_attr;
 185
 186	case ATTR_LIST:
 187		if (attr->name_len || le || ino == MFT_REC_LOG)
 188			goto out;
 189
 190		err = ntfs_load_attr_list(ni, attr);
 191		if (err)
 192			goto out;
 193
 194		le = NULL;
 195		attr = NULL;
 196		goto next_attr;
 197
 198	case ATTR_NAME:
 199		if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
 200		    rsize < SIZEOF_ATTRIBUTE_FILENAME)
 201			goto out;
 202
 203		names += 1;
 204		fname = Add2Ptr(attr, roff);
 205		if (fname->type == FILE_NAME_DOS)
 206			goto next_attr;
 207
 208		links += 1;
 209		if (name && name->len == fname->name_len &&
 210		    !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
 211					NULL, false))
 212			is_match = true;
 213
 214		goto next_attr;
 215
 216	case ATTR_DATA:
 217		if (is_dir) {
 218			/* Ignore data attribute in dir record. */
 219			goto next_attr;
 220		}
 221
 222		if (ino == MFT_REC_BADCLUST && !attr->non_res)
 223			goto next_attr;
 224
 225		if (attr->name_len &&
 226		    ((ino != MFT_REC_BADCLUST || !attr->non_res ||
 227		      attr->name_len != ARRAY_SIZE(BAD_NAME) ||
 228		      memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
 229		     (ino != MFT_REC_SECURE || !attr->non_res ||
 230		      attr->name_len != ARRAY_SIZE(SDS_NAME) ||
 231		      memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
 232			/* File contains stream attribute. Ignore it. */
 233			goto next_attr;
 234		}
 235
 236		if (is_attr_sparsed(attr))
 237			ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
 238		else
 239			ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
 240
 241		if (is_attr_compressed(attr))
 242			ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
 243		else
 244			ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
 245
 246		if (is_attr_encrypted(attr))
 247			ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
 248		else
 249			ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
 250
 251		if (!attr->non_res) {
 252			ni->i_valid = inode->i_size = rsize;
 253			inode_set_bytes(inode, rsize);
 254		}
 255
 256		mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
 257
 258		if (!attr->non_res) {
 259			ni->ni_flags |= NI_FLAG_RESIDENT;
 260			goto next_attr;
 261		}
 262
 263		inode_set_bytes(inode, attr_ondisk_size(attr));
 264
 265		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 266		inode->i_size = le64_to_cpu(attr->nres.data_size);
 267		if (!attr->nres.alloc_size)
 268			goto next_attr;
 269
 270		run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
 271					      &ni->file.run;
 272		break;
 273
 274	case ATTR_ROOT:
 275		if (attr->non_res)
 276			goto out;
 277
 278		root = Add2Ptr(attr, roff);
 279
 280		if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
 281		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 282			goto next_attr;
 283
 284		if (root->type != ATTR_NAME ||
 285		    root->rule != NTFS_COLLATION_TYPE_FILENAME)
 286			goto out;
 287
 288		if (!is_dir)
 289			goto next_attr;
 290
 291		is_root = true;
 292		ni->ni_flags |= NI_FLAG_DIR;
 293
 294		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
 295		if (err)
 296			goto out;
 297
 298		mode = sb->s_root ?
 299			       (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) :
 300			       (S_IFDIR | 0777);
 301		goto next_attr;
 302
 303	case ATTR_ALLOC:
 304		if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
 305		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
 306			goto next_attr;
 307
 308		inode->i_size = le64_to_cpu(attr->nres.data_size);
 309		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
 310		inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
 311
 312		run = &ni->dir.alloc_run;
 313		break;
 314
 315	case ATTR_BITMAP:
 316		if (ino == MFT_REC_MFT) {
 317			if (!attr->non_res)
 318				goto out;
 319#ifndef CONFIG_NTFS3_64BIT_CLUSTER
 320			/* 0x20000000 = 2^32 / 8 */
 321			if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
 322				goto out;
 323#endif
 324			run = &sbi->mft.bitmap.run;
 325			break;
 326		} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
 327			   !memcmp(attr_name(attr), I30_NAME,
 328				   sizeof(I30_NAME)) &&
 329			   attr->non_res) {
 330			run = &ni->dir.bitmap_run;
 331			break;
 332		}
 333		goto next_attr;
 334
 335	case ATTR_REPARSE:
 336		if (attr->name_len)
 337			goto next_attr;
 338
 339		rp_fa = ni_parse_reparse(ni, attr, &rp);
 340		switch (rp_fa) {
 341		case REPARSE_LINK:
 342			/*
 343			 * Normal symlink.
 344			 * Assume one unicode symbol == one utf8.
 345			 */
 346			inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
 347							    .PrintNameLength) /
 348					sizeof(u16);
 349			ni->i_valid = inode->i_size;
 350			/* Clear directory bit. */
 351			if (ni->ni_flags & NI_FLAG_DIR) {
 352				indx_clear(&ni->dir);
 353				memset(&ni->dir, 0, sizeof(ni->dir));
 354				ni->ni_flags &= ~NI_FLAG_DIR;
 355			} else {
 356				run_close(&ni->file.run);
 357			}
 358			mode = S_IFLNK | 0777;
 359			is_dir = false;
 360			if (attr->non_res) {
 361				run = &ni->file.run;
 362				goto attr_unpack_run; // Double break.
 363			}
 364			break;
 365
 366		case REPARSE_COMPRESSED:
 367			break;
 368
 369		case REPARSE_DEDUPLICATED:
 370			break;
 371		}
 372		goto next_attr;
 373
 374	case ATTR_EA_INFO:
 375		if (!attr->name_len &&
 376		    resident_data_ex(attr, sizeof(struct EA_INFO))) {
 377			ni->ni_flags |= NI_FLAG_EA;
 378			/*
 379			 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
 380			 */
 381			inode->i_mode = mode;
 382			ntfs_get_wsl_perm(inode);
 383			mode = inode->i_mode;
 384		}
 385		goto next_attr;
 386
 387	default:
 388		goto next_attr;
 389	}
 390
 391attr_unpack_run:
 392	roff = le16_to_cpu(attr->nres.run_off);
 393
 394	if (roff > asize) {
 395		err = -EINVAL;
 396		goto out;
 397	}
 398
 399	t64 = le64_to_cpu(attr->nres.svcn);
 400
 401	err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
 402			    t64, Add2Ptr(attr, roff), asize - roff);
 403	if (err < 0)
 404		goto out;
 405	err = 0;
 406	goto next_attr;
 407
 408end_enum:
 409
 410	if (!std5)
 411		goto out;
 412
 413	if (is_bad_inode(inode))
 414		goto out;
 415
 416	if (!is_match && name) {
 417		err = -ENOENT;
 418		goto out;
 419	}
 420
 421	if (std5->fa & FILE_ATTRIBUTE_READONLY)
 422		mode &= ~0222;
 423
 424	if (!names) {
 425		err = -EINVAL;
 426		goto out;
 427	}
 428
 429	if (names != le16_to_cpu(rec->hard_links)) {
 430		/* Correct minor error on the fly. Do not mark inode as dirty. */
 431		ntfs_inode_warn(inode, "Correct links count -> %u.", names);
 432		rec->hard_links = cpu_to_le16(names);
 433		ni->mi.dirty = true;
 434	}
 435
 436	set_nlink(inode, links);
 437
 438	if (S_ISDIR(mode)) {
 439		ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
 440
 441		/*
 442		 * Dot and dot-dot should be included in count but was not
 443		 * included in enumeration.
 444		 * Usually a hard links to directories are disabled.
 445		 */
 446		inode->i_op = &ntfs_dir_inode_operations;
 447		inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
 448				       &ntfs_legacy_dir_operations :
 449				       &ntfs_dir_operations;
 450		ni->i_valid = 0;
 451	} else if (S_ISLNK(mode)) {
 452		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 453		inode->i_op = &ntfs_link_inode_operations;
 454		inode->i_fop = NULL;
 455		inode_nohighmem(inode);
 456	} else if (S_ISREG(mode)) {
 457		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 458		inode->i_op = &ntfs_file_inode_operations;
 459		inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
 460				       &ntfs_legacy_file_operations :
 461				       &ntfs_file_operations;
 462		inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
 463							      &ntfs_aops;
 464		if (ino != MFT_REC_MFT)
 465			init_rwsem(&ni->file.run_lock);
 466	} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
 467		   S_ISSOCK(mode)) {
 468		inode->i_op = &ntfs_special_inode_operations;
 469		init_special_inode(inode, mode, inode->i_rdev);
 470	} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 471		   fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 472		/* Records in $Extend are not a files or general directories. */
 473		inode->i_op = &ntfs_file_inode_operations;
 474		mode = S_IFREG;
 475		init_rwsem(&ni->file.run_lock);
 476	} else {
 477		err = -EINVAL;
 478		goto out;
 479	}
 480
 481	if ((sbi->options->sys_immutable &&
 482	     (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
 483	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
 484		inode->i_flags |= S_IMMUTABLE;
 485	} else {
 486		inode->i_flags &= ~S_IMMUTABLE;
 487	}
 488
 489	inode->i_mode = mode;
 490	if (!(ni->ni_flags & NI_FLAG_EA)) {
 491		/* If no xattr then no security (stored in xattr). */
 492		inode->i_flags |= S_NOSEC;
 493	}
 494
 495	if (ino == MFT_REC_MFT && !sb->s_root)
 496		sbi->mft.ni = NULL;
 497
 498	unlock_new_inode(inode);
 499
 500	return inode;
 501
 502out:
 503	if (ino == MFT_REC_MFT && !sb->s_root)
 504		sbi->mft.ni = NULL;
 505
 506	iget_failed(inode);
 507	return ERR_PTR(err);
 508}
 509
 510/*
 511 * ntfs_test_inode
 512 *
 513 * Return: 1 if match.
 514 */
 515static int ntfs_test_inode(struct inode *inode, void *data)
 516{
 517	struct MFT_REF *ref = data;
 518
 519	return ino_get(ref) == inode->i_ino;
 520}
 521
 522static int ntfs_set_inode(struct inode *inode, void *data)
 523{
 524	const struct MFT_REF *ref = data;
 525
 526	inode->i_ino = ino_get(ref);
 527	return 0;
 528}
 529
 530struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
 531			 const struct cpu_str *name)
 532{
 533	struct inode *inode;
 534
 535	inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
 536			     (void *)ref);
 537	if (unlikely(!inode))
 538		return ERR_PTR(-ENOMEM);
 539
 540	/* If this is a freshly allocated inode, need to read it now. */
 541	if (inode_state_read_once(inode) & I_NEW)
 542		inode = ntfs_read_mft(inode, name, ref);
 543	else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
 544		/*
 545		 * Sequence number is not expected.
 546		 * Looks like inode was reused but caller uses the old reference
 547		 */
 548		iput(inode);
 549		inode = ERR_PTR(-ESTALE);
 550	}
 551
 552	if (IS_ERR(inode))
 553		ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
 554
 555	return inode;
 556}
 557
 558enum get_block_ctx {
 559	GET_BLOCK_GENERAL = 0,
 560	GET_BLOCK_WRITE_BEGIN = 1,
 561	GET_BLOCK_DIRECT_IO_R = 2,
 562	GET_BLOCK_DIRECT_IO_W = 3,
 563	GET_BLOCK_BMAP = 4,
 564};
 565
 566static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 567				       struct buffer_head *bh, int create,
 568				       enum get_block_ctx ctx)
 569{
 570	struct super_block *sb = inode->i_sb;
 571	struct ntfs_sb_info *sbi = sb->s_fs_info;
 572	struct ntfs_inode *ni = ntfs_i(inode);
 573	struct folio *folio = bh->b_folio;
 574	u8 cluster_bits = sbi->cluster_bits;
 575	u32 block_size = sb->s_blocksize;
 576	u64 bytes, lbo, valid;
 577	u32 off;
 578	int err;
 579	CLST vcn, lcn, len;
 580	bool new;
 581
 582	/* Clear previous state. */
 583	clear_buffer_new(bh);
 584	clear_buffer_uptodate(bh);
 585
 586	if (is_resident(ni)) {
 587		bh->b_blocknr = RESIDENT_LCN;
 588		bh->b_size = block_size;
 589		if (!folio) {
 590			/* direct io (read) or bmap call */
 591			err = 0;
 592		} else {
 593			ni_lock(ni);
 594			err = attr_data_read_resident(ni, folio);
 595			ni_unlock(ni);
 596
 597			if (!err)
 598				set_buffer_uptodate(bh);
 599		}
 600		return err;
 601	}
 602
 603	vcn = vbo >> cluster_bits;
 604	off = vbo & sbi->cluster_mask;
 605	new = false;
 606
 607	err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL,
 608				  create && sbi->cluster_size > PAGE_SIZE);
 609	if (err)
 610		goto out;
 611
 612	if (!len)
 613		return 0;
 614
 615	bytes = ((u64)len << cluster_bits) - off;
 616
 617	if (lcn >= sbi->used.bitmap.nbits) {
 618		/* This case includes resident/compressed/sparse. */
 619		if (!create) {
 620			if (bh->b_size > bytes)
 621				bh->b_size = bytes;
 622			return 0;
 623		}
 624		WARN_ON(1);
 625	}
 626
 627	if (new)
 628		set_buffer_new(bh);
 629
 630	lbo = ((u64)lcn << cluster_bits) + off;
 631
 632	set_buffer_mapped(bh);
 633	bh->b_bdev = sb->s_bdev;
 634	bh->b_blocknr = lbo >> sb->s_blocksize_bits;
 635
 636	valid = ni->i_valid;
 637
 638	if (ctx == GET_BLOCK_DIRECT_IO_W) {
 639		/* ntfs_direct_IO will update ni->i_valid. */
 640		if (vbo >= valid)
 641			set_buffer_new(bh);
 642	} else if (create) {
 643		/* Normal write. */
 644		if (bytes > bh->b_size)
 645			bytes = bh->b_size;
 646
 647		if (vbo >= valid)
 648			set_buffer_new(bh);
 649
 650		if (vbo + bytes > valid) {
 651			ni->i_valid = vbo + bytes;
 652			mark_inode_dirty(inode);
 653		}
 654	} else if (vbo >= valid) {
 655		/* Read out of valid data. */
 656		clear_buffer_mapped(bh);
 657	} else if (vbo + bytes <= valid) {
 658		/* Normal read. */
 659	} else if (vbo + block_size <= valid) {
 660		/* Normal short read. */
 661		bytes = block_size;
 662	} else {
 663		/*
 664		 * Read across valid size: vbo < valid && valid < vbo + block_size
 665		 */
 666		bytes = block_size;
 667
 668		if (folio) {
 669			u32 voff = valid - vbo;
 670
 671			bh->b_size = block_size;
 672			off = vbo & (PAGE_SIZE - 1);
 673			folio_set_bh(bh, folio, off);
 674
 675			if (bh_read(bh, 0) < 0) {
 676				err = -EIO;
 677				goto out;
 678			}
 679			folio_zero_segment(folio, off + voff, off + block_size);
 680		}
 681	}
 682
 683	if (bh->b_size > bytes)
 684		bh->b_size = bytes;
 685
 686#ifndef __LP64__
 687	if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
 688		static_assert(sizeof(size_t) < sizeof(loff_t));
 689		if (bytes > 0x40000000u)
 690			bh->b_size = 0x40000000u;
 691	}
 692#endif
 693
 694	return 0;
 695
 696out:
 697	return err;
 698}
 699
 700int ntfs_get_block(struct inode *inode, sector_t vbn,
 701		   struct buffer_head *bh_result, int create)
 702{
 703	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 704				  bh_result, create, GET_BLOCK_GENERAL);
 705}
 706
 707static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
 708			       struct buffer_head *bh_result, int create)
 709{
 710	return ntfs_get_block_vbo(inode,
 711				  (u64)vsn << inode->i_sb->s_blocksize_bits,
 712				  bh_result, create, GET_BLOCK_BMAP);
 713}
 714
 715static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
 716{
 717	return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
 718}
 719
 720static int ntfs_read_folio(struct file *file, struct folio *folio)
 721{
 722	int err;
 723	struct address_space *mapping = folio->mapping;
 724	struct inode *inode = mapping->host;
 725	struct ntfs_inode *ni = ntfs_i(inode);
 726
 727	if (is_resident(ni)) {
 728		ni_lock(ni);
 729		err = attr_data_read_resident(ni, folio);
 730		ni_unlock(ni);
 731		if (err != E_NTFS_NONRESIDENT) {
 732			folio_unlock(folio);
 733			return err;
 734		}
 735	}
 736
 737	if (is_compressed(ni)) {
 738		/* ni_lock is taken inside ni_read_folio_cmpr after page locks */
 739		err = ni_read_folio_cmpr(ni, folio);
 740		return err;
 741	}
 742
 743	/* Normal + sparse files. */
 744	return mpage_read_folio(folio, ntfs_get_block);
 745}
 746
 747static void ntfs_readahead(struct readahead_control *rac)
 748{
 749	struct address_space *mapping = rac->mapping;
 750	struct inode *inode = mapping->host;
 751	struct ntfs_inode *ni = ntfs_i(inode);
 752	u64 valid;
 753	loff_t pos;
 754
 755	if (is_resident(ni)) {
 756		/* No readahead for resident. */
 757		return;
 758	}
 759
 760	if (is_compressed(ni)) {
 761		/* No readahead for compressed. */
 762		return;
 763	}
 764
 765	valid = ni->i_valid;
 766	pos = readahead_pos(rac);
 767
 768	if (valid < i_size_read(inode) && pos <= valid &&
 769	    valid < pos + readahead_length(rac)) {
 770		/* Range cross 'valid'. Read it page by page. */
 771		return;
 772	}
 773
 774	mpage_readahead(rac, ntfs_get_block);
 775}
 776
 777static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
 778				      struct buffer_head *bh_result, int create)
 779{
 780	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 781				  bh_result, create, GET_BLOCK_DIRECT_IO_R);
 782}
 783
 784static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
 785				      struct buffer_head *bh_result, int create)
 786{
 787	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
 788				  bh_result, create, GET_BLOCK_DIRECT_IO_W);
 789}
 790
 791static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 792{
 793	struct file *file = iocb->ki_filp;
 794	struct address_space *mapping = file->f_mapping;
 795	struct inode *inode = mapping->host;
 796	struct ntfs_inode *ni = ntfs_i(inode);
 797	loff_t vbo = iocb->ki_pos;
 798	loff_t end;
 799	int wr = iov_iter_rw(iter) & WRITE;
 800	size_t iter_count = iov_iter_count(iter);
 801	loff_t valid;
 802	ssize_t ret;
 803
 804	if (is_resident(ni)) {
 805		/* Switch to buffered write. */
 806		ret = 0;
 807		goto out;
 808	}
 809	if (is_compressed(ni)) {
 810		ret = 0;
 811		goto out;
 812	}
 813
 814	ret = blockdev_direct_IO(iocb, inode, iter,
 815				 wr ? ntfs_get_block_direct_IO_W :
 816				      ntfs_get_block_direct_IO_R);
 817
 818	if (ret > 0)
 819		end = vbo + ret;
 820	else if (wr && ret == -EIOCBQUEUED)
 821		end = vbo + iter_count;
 822	else
 823		goto out;
 824
 825	valid = ni->i_valid;
 826	if (wr) {
 827		if (end > valid && !S_ISBLK(inode->i_mode)) {
 828			ni->i_valid = end;
 829			mark_inode_dirty(inode);
 830		}
 831	} else if (vbo < valid && valid < end) {
 832		/* Fix page. */
 833		iov_iter_revert(iter, end - valid);
 834		iov_iter_zero(end - valid, iter);
 835	}
 836
 837out:
 838	return ret;
 839}
 840
 841int ntfs_set_size(struct inode *inode, u64 new_size)
 842{
 843	struct super_block *sb = inode->i_sb;
 844	struct ntfs_sb_info *sbi = sb->s_fs_info;
 845	struct ntfs_inode *ni = ntfs_i(inode);
 846	int err;
 847
 848	/* Check for maximum file size. */
 849	if (is_sparsed(ni) || is_compressed(ni)) {
 850		if (new_size > sbi->maxbytes_sparse) {
 851			err = -EFBIG;
 852			goto out;
 853		}
 854	} else if (new_size > sbi->maxbytes) {
 855		err = -EFBIG;
 856		goto out;
 857	}
 858
 859	ni_lock(ni);
 860	down_write(&ni->file.run_lock);
 861
 862	err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
 863			    &ni->i_valid, true, NULL);
 864
 865	up_write(&ni->file.run_lock);
 866	ni_unlock(ni);
 867
 868	mark_inode_dirty(inode);
 869
 870out:
 871	return err;
 872}
 873
 874static int ntfs_resident_writepage(struct folio *folio,
 875				   struct writeback_control *wbc)
 876{
 877	struct address_space *mapping = folio->mapping;
 878	struct inode *inode = mapping->host;
 879	struct ntfs_inode *ni = ntfs_i(inode);
 880	int ret;
 881
 882	/* Avoid any operation if inode is bad. */
 883	if (unlikely(is_bad_ni(ni)))
 884		return -EINVAL;
 885
 886	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 887		return -EIO;
 888
 889	ni_lock(ni);
 890	ret = attr_data_write_resident(ni, folio);
 891	ni_unlock(ni);
 892
 893	if (ret != E_NTFS_NONRESIDENT)
 894		folio_unlock(folio);
 895	mapping_set_error(mapping, ret);
 896	return ret;
 897}
 898
 899static int ntfs_writepages(struct address_space *mapping,
 900			   struct writeback_control *wbc)
 901{
 902	struct inode *inode = mapping->host;
 903
 904	/* Avoid any operation if inode is bad. */
 905	if (unlikely(is_bad_ni(ntfs_i(inode))))
 906		return -EINVAL;
 907
 908	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 909		return -EIO;
 910
 911	if (is_resident(ntfs_i(inode))) {
 912		struct folio *folio = NULL;
 913		int error;
 914
 915		while ((folio = writeback_iter(mapping, wbc, folio, &error)))
 916			error = ntfs_resident_writepage(folio, wbc);
 917		return error;
 918	}
 919	return mpage_writepages(mapping, wbc, ntfs_get_block);
 920}
 921
 922static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
 923				      struct buffer_head *bh_result, int create)
 924{
 925	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
 926				  bh_result, create, GET_BLOCK_WRITE_BEGIN);
 927}
 928
 929int ntfs_write_begin(const struct kiocb *iocb, struct address_space *mapping,
 930		     loff_t pos, u32 len, struct folio **foliop, void **fsdata)
 931{
 932	int err;
 933	struct inode *inode = mapping->host;
 934	struct ntfs_inode *ni = ntfs_i(inode);
 935
 936	/* Avoid any operation if inode is bad. */
 937	if (unlikely(is_bad_ni(ni)))
 938		return -EINVAL;
 939
 940	if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 941		return -EIO;
 942
 943	if (is_resident(ni)) {
 944		struct folio *folio = __filemap_get_folio(
 945			mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
 946			mapping_gfp_mask(mapping));
 947
 948		if (IS_ERR(folio)) {
 949			err = PTR_ERR(folio);
 950			goto out;
 951		}
 952
 953		ni_lock(ni);
 954		err = attr_data_read_resident(ni, folio);
 955		ni_unlock(ni);
 956
 957		if (!err) {
 958			*foliop = folio;
 959			goto out;
 960		}
 961		folio_unlock(folio);
 962		folio_put(folio);
 963
 964		if (err != E_NTFS_NONRESIDENT)
 965			goto out;
 966	}
 967
 968	err = block_write_begin(mapping, pos, len, foliop,
 969				ntfs_get_block_write_begin);
 970
 971out:
 972	return err;
 973}
 974
 975/*
 976 * ntfs_write_end - Address_space_operations::write_end.
 977 */
 978int ntfs_write_end(const struct kiocb *iocb, struct address_space *mapping,
 979		   loff_t pos, u32 len, u32 copied, struct folio *folio,
 980		   void *fsdata)
 981{
 982	struct inode *inode = mapping->host;
 983	struct ntfs_inode *ni = ntfs_i(inode);
 984	u64 valid = ni->i_valid;
 985	bool dirty = false;
 986	int err;
 987
 988	if (is_resident(ni)) {
 989		ni_lock(ni);
 990		err = attr_data_write_resident(ni, folio);
 991		ni_unlock(ni);
 992		if (!err) {
 993			struct buffer_head *head = folio_buffers(folio);
 994			dirty = true;
 995			/* Clear any buffers in folio. */
 996			if (head) {
 997				struct buffer_head *bh = head;
 998
 999				do {
1000					clear_buffer_dirty(bh);
1001					clear_buffer_mapped(bh);
1002					set_buffer_uptodate(bh);
1003				} while (head != (bh = bh->b_this_page));
1004			}
1005			folio_mark_uptodate(folio);
1006			err = copied;
1007		}
1008		folio_unlock(folio);
1009		folio_put(folio);
1010	} else {
1011		err = generic_write_end(iocb, mapping, pos, len, copied, folio,
1012					fsdata);
1013	}
1014
1015	if (err >= 0) {
1016		if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
1017			inode_set_mtime_to_ts(inode,
1018					      inode_set_ctime_current(inode));
1019			ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
1020			dirty = true;
1021		}
1022
1023		if (valid != ni->i_valid) {
1024			/* ni->i_valid is changed in ntfs_get_block_vbo. */
1025			dirty = true;
1026		}
1027
1028		if (pos + err > inode->i_size) {
1029			i_size_write(inode, pos + err);
1030			dirty = true;
1031		}
1032
1033		if (dirty)
1034			mark_inode_dirty(inode);
1035	}
1036
1037	return err;
1038}
1039
1040int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
1041{
1042	return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1043}
1044
1045int ntfs_sync_inode(struct inode *inode)
1046{
1047	return _ni_write_inode(inode, 1);
1048}
1049
1050/*
1051 * Helper function to read file.
1052 */
1053int inode_read_data(struct inode *inode, void *data, size_t bytes)
1054{
1055	pgoff_t idx;
1056	struct address_space *mapping = inode->i_mapping;
1057
1058	for (idx = 0; bytes; idx++) {
1059		size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
1060		struct page *page = read_mapping_page(mapping, idx, NULL);
1061		void *kaddr;
1062
1063		if (IS_ERR(page))
1064			return PTR_ERR(page);
1065
1066		kaddr = kmap_atomic(page);
1067		memcpy(data, kaddr, op);
1068		kunmap_atomic(kaddr);
1069
1070		put_page(page);
1071
1072		bytes -= op;
1073		data = Add2Ptr(data, PAGE_SIZE);
1074	}
1075	return 0;
1076}
1077
1078/*
1079 * ntfs_reparse_bytes
1080 *
1081 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1082 * for unicode string of @uni_len length.
1083 */
1084static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute)
1085{
1086	/* Header + unicode string + decorated unicode string. */
1087	return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) +
1088	       offsetof(struct REPARSE_DATA_BUFFER,
1089			SymbolicLinkReparseBuffer.PathBuffer);
1090}
1091
1092static struct REPARSE_DATA_BUFFER *
1093ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
1094			   u32 size, u16 *nsize)
1095{
1096	int i, err;
1097	struct REPARSE_DATA_BUFFER *rp;
1098	__le16 *rp_name;
1099	typeof(rp->SymbolicLinkReparseBuffer) *rs;
1100	bool is_absolute;
1101
1102	is_absolute = symname[0] && symname[1] == ':';
1103
1104	rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS);
1105	if (!rp)
1106		return ERR_PTR(-ENOMEM);
1107
1108	rs = &rp->SymbolicLinkReparseBuffer;
1109	rp_name = rs->PathBuffer;
1110
1111	/* Convert link name to UTF-16. */
1112	err = ntfs_nls_to_utf16(sbi, symname, size,
1113				(struct cpu_str *)(rp_name - 1), 2 * size,
1114				UTF16_LITTLE_ENDIAN);
1115	if (err < 0)
1116		goto out;
1117
1118	/* err = the length of unicode name of symlink. */
1119	*nsize = ntfs_reparse_bytes(err, is_absolute);
1120
1121	if (*nsize > sbi->reparse.max_size) {
1122		err = -EFBIG;
1123		goto out;
1124	}
1125
1126	/* Translate Linux '/' into Windows '\'. */
1127	for (i = 0; i < err; i++) {
1128		if (rp_name[i] == cpu_to_le16('/'))
1129			rp_name[i] = cpu_to_le16('\\');
1130	}
1131
1132	rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
1133	rp->ReparseDataLength =
1134		cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
1135					      SymbolicLinkReparseBuffer));
1136
1137	/* PrintName + SubstituteName. */
1138	rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
1139	rs->SubstituteNameLength =
1140		cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0));
1141	rs->PrintNameLength = rs->SubstituteNameOffset;
1142
1143	/*
1144	 * TODO: Use relative path if possible to allow Windows to
1145	 * parse this path.
1146	 * 0-absolute path, 1- relative path (SYMLINK_FLAG_RELATIVE).
1147	 */
1148	rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
1149
1150	memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name,
1151		sizeof(short) * err);
1152
1153	if (is_absolute) {
1154		/* Decorate SubstituteName. */
1155		rp_name += err;
1156		rp_name[0] = cpu_to_le16('\\');
1157		rp_name[1] = cpu_to_le16('?');
1158		rp_name[2] = cpu_to_le16('?');
1159		rp_name[3] = cpu_to_le16('\\');
1160	}
1161
1162	return rp;
1163out:
1164	kfree(rp);
1165	return ERR_PTR(err);
1166}
1167
1168/*
1169 * ntfs_create_inode
1170 *
1171 * Helper function for:
1172 * - ntfs_create
1173 * - ntfs_mknod
1174 * - ntfs_symlink
1175 * - ntfs_mkdir
1176 * - ntfs_atomic_open
1177 *
1178 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
1179 */
1180int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
1181		      struct dentry *dentry, const struct cpu_str *uni,
1182		      umode_t mode, dev_t dev, const char *symname, u32 size,
1183		      struct ntfs_fnd *fnd)
1184{
1185	int err;
1186	struct super_block *sb = dir->i_sb;
1187	struct ntfs_sb_info *sbi = sb->s_fs_info;
1188	const struct qstr *name = &dentry->d_name;
1189	CLST ino = 0;
1190	struct ntfs_inode *dir_ni = ntfs_i(dir);
1191	struct ntfs_inode *ni = NULL;
1192	struct inode *inode = NULL;
1193	struct ATTRIB *attr;
1194	struct ATTR_STD_INFO5 *std5;
1195	struct ATTR_FILE_NAME *fname;
1196	struct MFT_REC *rec;
1197	u32 asize, dsize, sd_size;
1198	enum FILE_ATTRIBUTE fa;
1199	__le32 security_id = SECURITY_ID_INVALID;
1200	CLST vcn;
1201	const void *sd;
1202	u16 t16, nsize = 0, aid = 0;
1203	struct INDEX_ROOT *root, *dir_root;
1204	struct NTFS_DE *e, *new_de = NULL;
1205	struct REPARSE_DATA_BUFFER *rp = NULL;
1206	bool rp_inserted = false;
1207
1208	/* New file will be resident or non resident. */
1209	const bool new_file_resident = 1;
1210
1211	if (!fnd)
1212		ni_lock_dir(dir_ni);
1213
1214	dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1215	if (!dir_root) {
1216		err = -EINVAL;
1217		goto out1;
1218	}
1219
1220	if (S_ISDIR(mode)) {
1221		/* Use parent's directory attributes. */
1222		fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
1223		     FILE_ATTRIBUTE_ARCHIVE;
1224		/*
1225		 * By default child directory inherits parent attributes.
1226		 * Root directory is hidden + system.
1227		 * Make an exception for children in root.
1228		 */
1229		if (dir->i_ino == MFT_REC_ROOT)
1230			fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
1231	} else if (S_ISLNK(mode)) {
1232		/* It is good idea that link should be the same type (file/dir) as target */
1233		fa = FILE_ATTRIBUTE_REPARSE_POINT;
1234
1235		/*
1236		 * Linux: there are dir/file/symlink and so on.
1237		 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1238		 * It is good idea to create:
1239		 * dir + reparse if 'symname' points to directory
1240		 * or
1241		 * file + reparse if 'symname' points to file
1242		 * Unfortunately kern_path hangs if symname contains 'dir'.
1243		 */
1244
1245		/*
1246		 *	struct path path;
1247		 *
1248		 *	if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
1249		 *		struct inode *target = d_inode(path.dentry);
1250		 *
1251		 *		if (S_ISDIR(target->i_mode))
1252		 *			fa |= FILE_ATTRIBUTE_DIRECTORY;
1253		 *		// if ( target->i_sb == sb ){
1254		 *		//	use relative path?
1255		 *		// }
1256		 *		path_put(&path);
1257		 *	}
1258		 */
1259	} else if (S_ISREG(mode)) {
1260		if (sbi->options->sparse) {
1261			/* Sparsed regular file, cause option 'sparse'. */
1262			fa = FILE_ATTRIBUTE_SPARSE_FILE |
1263			     FILE_ATTRIBUTE_ARCHIVE;
1264		} else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1265			/* Compressed regular file, if parent is compressed. */
1266			fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
1267		} else {
1268			/* Regular file, default attributes. */
1269			fa = FILE_ATTRIBUTE_ARCHIVE;
1270		}
1271	} else {
1272		fa = FILE_ATTRIBUTE_ARCHIVE;
1273	}
1274
1275	/* If option "hide_dot_files" then set hidden attribute for dot files. */
1276	if (sbi->options->hide_dot_files && name->name[0] == '.')
1277		fa |= FILE_ATTRIBUTE_HIDDEN;
1278
1279	if (!(mode & 0222))
1280		fa |= FILE_ATTRIBUTE_READONLY;
1281
1282	/* Allocate PATH_MAX bytes. */
1283	new_de = kzalloc(PATH_MAX, GFP_KERNEL);
1284	if (!new_de) {
1285		err = -ENOMEM;
1286		goto out1;
1287	}
1288
1289	/* Avoid any operation if inode is bad. */
1290	if (unlikely(is_bad_ni(dir_ni))) {
1291		err = -EINVAL;
1292		goto out2;
1293	}
1294
1295	if (unlikely(ntfs3_forced_shutdown(sb))) {
1296		err = -EIO;
1297		goto out2;
1298	}
1299
1300	/* Mark rw ntfs as dirty. it will be cleared at umount. */
1301	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1302
1303	/* Step 1: allocate and fill new mft record. */
1304	err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
1305	if (err)
1306		goto out2;
1307
1308	ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0);
1309	if (IS_ERR(ni)) {
1310		err = PTR_ERR(ni);
1311		ni = NULL;
1312		goto out3;
1313	}
1314	inode = &ni->vfs_inode;
1315	inode_init_owner(idmap, inode, dir, mode);
1316	mode = inode->i_mode;
1317
1318	ni->i_crtime = current_time(inode);
1319
1320	rec = ni->mi.mrec;
1321	rec->hard_links = cpu_to_le16(1);
1322	attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
1323
1324	/* Get default security id. */
1325	sd = s_default_security;
1326	sd_size = sizeof(s_default_security);
1327
1328	if (is_ntfs3(sbi)) {
1329		security_id = dir_ni->std_security_id;
1330		if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
1331			security_id = sbi->security.def_security_id;
1332
1333			if (security_id == SECURITY_ID_INVALID &&
1334			    !ntfs_insert_security(sbi, sd, sd_size,
1335						  &security_id, NULL))
1336				sbi->security.def_security_id = security_id;
1337		}
1338	}
1339
1340	/* Insert standard info. */
1341	std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
1342
1343	if (security_id == SECURITY_ID_INVALID) {
1344		dsize = sizeof(struct ATTR_STD_INFO);
1345	} else {
1346		dsize = sizeof(struct ATTR_STD_INFO5);
1347		std5->security_id = security_id;
1348		ni->std_security_id = security_id;
1349	}
1350	asize = SIZEOF_RESIDENT + dsize;
1351
1352	attr->type = ATTR_STD;
1353	attr->size = cpu_to_le32(asize);
1354	attr->id = cpu_to_le16(aid++);
1355	attr->res.data_off = SIZEOF_RESIDENT_LE;
1356	attr->res.data_size = cpu_to_le32(dsize);
1357
1358	std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
1359		kernel2nt(&ni->i_crtime);
1360
1361	std5->fa = ni->std_fa = fa;
1362
1363	attr = Add2Ptr(attr, asize);
1364
1365	/* Insert file name. */
1366	err = fill_name_de(sbi, new_de, name, uni);
1367	if (err)
1368		goto out4;
1369
1370	mi_get_ref(&ni->mi, &new_de->ref);
1371
1372	fname = (struct ATTR_FILE_NAME *)(new_de + 1);
1373
1374	if (sbi->options->windows_names &&
1375	    !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) {
1376		err = -EINVAL;
1377		goto out4;
1378	}
1379
1380	mi_get_ref(&dir_ni->mi, &fname->home);
1381	fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
1382		fname->dup.a_time = std5->cr_time;
1383	fname->dup.alloc_size = fname->dup.data_size = 0;
1384	fname->dup.fa = std5->fa;
1385	fname->dup.extend_data = S_ISLNK(mode) ? IO_REPARSE_TAG_SYMLINK : 0;
1386
1387	dsize = le16_to_cpu(new_de->key_size);
1388	asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1389
1390	attr->type = ATTR_NAME;
1391	attr->size = cpu_to_le32(asize);
1392	attr->res.data_off = SIZEOF_RESIDENT_LE;
1393	attr->res.flags = RESIDENT_FLAG_INDEXED;
1394	attr->id = cpu_to_le16(aid++);
1395	attr->res.data_size = cpu_to_le32(dsize);
1396	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
1397
1398	attr = Add2Ptr(attr, asize);
1399
1400	if (security_id == SECURITY_ID_INVALID) {
1401		/* Insert security attribute. */
1402		asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1403
1404		attr->type = ATTR_SECURE;
1405		attr->size = cpu_to_le32(asize);
1406		attr->id = cpu_to_le16(aid++);
1407		attr->res.data_off = SIZEOF_RESIDENT_LE;
1408		attr->res.data_size = cpu_to_le32(sd_size);
1409		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
1410
1411		attr = Add2Ptr(attr, asize);
1412	}
1413
1414	attr->id = cpu_to_le16(aid++);
1415	if (fa & FILE_ATTRIBUTE_DIRECTORY) {
1416		/*
1417		 * Regular directory or symlink to directory.
1418		 * Create root attribute.
1419		 */
1420		dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
1421		asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
1422
1423		attr->type = ATTR_ROOT;
1424		attr->size = cpu_to_le32(asize);
1425
1426		attr->name_len = ARRAY_SIZE(I30_NAME);
1427		attr->name_off = SIZEOF_RESIDENT_LE;
1428		attr->res.data_off =
1429			cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
1430		attr->res.data_size = cpu_to_le32(dsize);
1431		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
1432		       sizeof(I30_NAME));
1433
1434		root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
1435		memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
1436		root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR));
1437		root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
1438					      sizeof(struct NTFS_DE));
1439		root->ihdr.total = root->ihdr.used;
1440
1441		e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
1442		e->size = cpu_to_le16(sizeof(struct NTFS_DE));
1443		e->flags = NTFS_IE_LAST;
1444	} else if (S_ISLNK(mode)) {
1445		/*
1446		 * Symlink to file.
1447		 * Create empty resident data attribute.
1448		 */
1449		asize = SIZEOF_RESIDENT;
1450
1451		/* Insert empty ATTR_DATA */
1452		attr->type = ATTR_DATA;
1453		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1454		attr->name_off = SIZEOF_RESIDENT_LE;
1455		attr->res.data_off = SIZEOF_RESIDENT_LE;
1456	} else if (!new_file_resident && S_ISREG(mode)) {
1457		/*
1458		 * Regular file. Create empty non resident data attribute.
1459		 */
1460		attr->type = ATTR_DATA;
1461		attr->non_res = 1;
1462		attr->nres.evcn = cpu_to_le64(-1ll);
1463		if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
1464			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1465			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1466			attr->flags = ATTR_FLAG_SPARSED;
1467			asize = SIZEOF_NONRESIDENT_EX + 8;
1468		} else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
1469			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
1470			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
1471			attr->flags = ATTR_FLAG_COMPRESSED;
1472			attr->nres.c_unit = NTFS_LZNT_CUNIT;
1473			asize = SIZEOF_NONRESIDENT_EX + 8;
1474		} else {
1475			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
1476			attr->name_off = SIZEOF_NONRESIDENT_LE;
1477			asize = SIZEOF_NONRESIDENT + 8;
1478		}
1479		attr->nres.run_off = attr->name_off;
1480	} else {
1481		/*
1482		 * Node. Create empty resident data attribute.
1483		 */
1484		attr->type = ATTR_DATA;
1485		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
1486		attr->name_off = SIZEOF_RESIDENT_LE;
1487		if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
1488			attr->flags = ATTR_FLAG_SPARSED;
1489		else if (fa & FILE_ATTRIBUTE_COMPRESSED)
1490			attr->flags = ATTR_FLAG_COMPRESSED;
1491		attr->res.data_off = SIZEOF_RESIDENT_LE;
1492		asize = SIZEOF_RESIDENT;
1493		ni->ni_flags |= NI_FLAG_RESIDENT;
1494	}
1495
1496	if (S_ISDIR(mode)) {
1497		ni->ni_flags |= NI_FLAG_DIR;
1498		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
1499		if (err)
1500			goto out4;
1501	} else if (S_ISLNK(mode)) {
1502		rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);
1503
1504		if (IS_ERR(rp)) {
1505			err = PTR_ERR(rp);
1506			rp = NULL;
1507			goto out4;
1508		}
1509
1510		/*
1511		 * Insert ATTR_REPARSE.
1512		 */
1513		attr = Add2Ptr(attr, asize);
1514		attr->type = ATTR_REPARSE;
1515		attr->id = cpu_to_le16(aid++);
1516
1517		/* Resident or non resident? */
1518		asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1519		t16 = PtrOffset(rec, attr);
1520
1521		/*
1522		 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
1523		 * It is good idea to keep extended attributes resident.
1524		 */
1525		if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1526			CLST alen;
1527			CLST clst = bytes_to_cluster(sbi, nsize);
1528
1529			/* Bytes per runs. */
1530			t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
1531
1532			attr->non_res = 1;
1533			attr->nres.evcn = cpu_to_le64(clst - 1);
1534			attr->name_off = SIZEOF_NONRESIDENT_LE;
1535			attr->nres.run_off = attr->name_off;
1536			attr->nres.data_size = cpu_to_le64(nsize);
1537			attr->nres.valid_size = attr->nres.data_size;
1538			attr->nres.alloc_size =
1539				cpu_to_le64(ntfs_up_cluster(sbi, nsize));
1540
1541			err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
1542						     clst, NULL, ALLOCATE_DEF,
1543						     &alen, 0, NULL, NULL);
1544			if (err)
1545				goto out5;
1546
1547			err = run_pack(&ni->file.run, 0, clst,
1548				       Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
1549				       &vcn);
1550			if (err < 0)
1551				goto out5;
1552
1553			if (vcn != clst) {
1554				err = -EINVAL;
1555				goto out5;
1556			}
1557
1558			asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1559			/* Write non resident data. */
1560			err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp,
1561						nsize, 0);
1562			if (err)
1563				goto out5;
1564		} else {
1565			attr->res.data_off = SIZEOF_RESIDENT_LE;
1566			attr->res.data_size = cpu_to_le32(nsize);
1567			memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
1568		}
1569		/* Size of symlink equals the length of input string. */
1570		inode->i_size = size;
1571
1572		attr->size = cpu_to_le32(asize);
1573
1574		err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
1575					  &new_de->ref);
1576		if (err)
1577			goto out5;
1578
1579		rp_inserted = true;
1580	}
1581
1582	attr = Add2Ptr(attr, asize);
1583	attr->type = ATTR_END;
1584
1585	rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
1586	rec->next_attr_id = cpu_to_le16(aid);
1587
1588	inode->i_generation = le16_to_cpu(rec->seq);
1589
1590	if (S_ISDIR(mode)) {
1591		inode->i_op = &ntfs_dir_inode_operations;
1592		inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1593				       &ntfs_legacy_dir_operations :
1594				       &ntfs_dir_operations;
1595	} else if (S_ISLNK(mode)) {
1596		inode->i_op = &ntfs_link_inode_operations;
1597		inode->i_fop = NULL;
1598		inode->i_mapping->a_ops = &ntfs_aops;
1599		inode->i_size = size;
1600		inode_nohighmem(inode);
1601	} else if (S_ISREG(mode)) {
1602		inode->i_op = &ntfs_file_inode_operations;
1603		inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
1604				       &ntfs_legacy_file_operations :
1605				       &ntfs_file_operations;
1606		inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
1607							      &ntfs_aops;
1608		init_rwsem(&ni->file.run_lock);
1609	} else {
1610		inode->i_op = &ntfs_special_inode_operations;
1611		init_special_inode(inode, mode, dev);
1612	}
1613
1614#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1615	if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
1616		err = ntfs_init_acl(idmap, inode, dir);
1617		if (err)
1618			goto out5;
1619	} else
1620#endif
1621	{
1622		inode->i_flags |= S_NOSEC;
1623	}
1624
1625	if (!S_ISLNK(mode)) {
1626		/*
1627		 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute.
1628		 * The packed size of extended attribute is stored in direntry too.
1629		 * 'fname' here points to inside new_de.
1630		 */
1631		err = ntfs_save_wsl_perm(inode, &fname->dup.extend_data);
1632		if (err)
1633			goto out6;
1634
1635		/*
1636		 * update ea_size in file_name attribute too.
1637		 * Use ni_find_attr cause layout of MFT record may be changed
1638		 * in ntfs_init_acl and ntfs_save_wsl_perm.
1639		 */
1640		attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL,
1641				    NULL);
1642		if (attr) {
1643			struct ATTR_FILE_NAME *fn;
1644
1645			fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
1646			if (fn)
1647				fn->dup.extend_data = fname->dup.extend_data;
1648		}
1649	}
1650
1651	/* We do not need to update parent directory later */
1652	ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT;
1653
1654	/* Step 2: Add new name in index. */
1655	err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1656	if (err)
1657		goto out6;
1658
1659	/*
1660	 * Call 'd_instantiate' after inode->i_op is set
1661	 * but before finish_open.
1662	 */
1663	d_instantiate(dentry, inode);
1664
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);
1671
1672	mark_inode_dirty(dir);
1673	mark_inode_dirty(inode);
1674
1675	/* Normal exit. */
1676	goto out2;
1677
1678out6:
1679	attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL);
1680	if (attr && attr->non_res) {
1681		/* Delete ATTR_EA, if non-resident. */
1682		struct runs_tree run;
1683		run_init(&run);
1684		attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL);
1685		run_close(&run);
1686	}
1687
1688	if (rp_inserted)
1689		ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
1690
1691out5:
1692	if (!S_ISDIR(mode))
1693		run_deallocate(sbi, &ni->file.run, false);
1694
1695out4:
1696	clear_rec_inuse(rec);
1697	clear_nlink(inode);
1698	ni->mi.dirty = false;
1699	discard_new_inode(inode);
1700out3:
1701	ntfs_mark_rec_free(sbi, ino, false);
1702
1703out2:
1704	kfree(new_de);
1705	kfree(rp);
1706
1707out1:
1708	if (!fnd)
1709		ni_unlock(dir_ni);
1710
1711	if (!err)
1712		unlock_new_inode(inode);
1713
1714	return err;
1715}
1716
1717int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
1718{
1719	int err;
1720	struct ntfs_inode *ni = ntfs_i(inode);
1721	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
1722	struct NTFS_DE *de;
1723
1724	/* Allocate PATH_MAX bytes. */
1725	de = kzalloc(PATH_MAX, GFP_KERNEL);
1726	if (!de)
1727		return -ENOMEM;
1728
1729	/* Mark rw ntfs as dirty. It will be cleared at umount. */
1730	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1731
1732	/* Construct 'de'. */
1733	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1734	if (err)
1735		goto out;
1736
1737	err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1738out:
1739	kfree(de);
1740	return err;
1741}
1742
1743/*
1744 * ntfs_unlink_inode
1745 *
1746 * inode_operations::unlink
1747 * inode_operations::rmdir
1748 */
1749int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
1750{
1751	int err;
1752	struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1753	struct inode *inode = d_inode(dentry);
1754	struct ntfs_inode *ni = ntfs_i(inode);
1755	struct ntfs_inode *dir_ni = ntfs_i(dir);
1756	struct NTFS_DE *de, *de2 = NULL;
1757	int undo_remove;
1758
1759	if (ntfs_is_meta_file(sbi, ni->mi.rno))
1760		return -EINVAL;
1761
1762	de = kzalloc(PATH_MAX, GFP_KERNEL);
1763	if (!de)
1764		return -ENOMEM;
1765
1766	ni_lock(ni);
1767
1768	if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1769		err = -ENOTEMPTY;
1770		goto out;
1771	}
1772
1773	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1774	if (err < 0)
1775		goto out;
1776
1777	undo_remove = 0;
1778	err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1779
1780	if (!err) {
1781		drop_nlink(inode);
1782		inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1783		mark_inode_dirty(dir);
1784		inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
1785		if (inode->i_nlink)
1786			mark_inode_dirty(inode);
1787	} else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1788		_ntfs_bad_inode(inode);
1789	} else {
1790		if (ni_is_dirty(dir))
1791			mark_inode_dirty(dir);
1792		if (ni_is_dirty(inode))
1793			mark_inode_dirty(inode);
1794	}
1795
1796out:
1797	ni_unlock(ni);
1798	kfree(de);
1799	return err;
1800}
1801
1802void ntfs_evict_inode(struct inode *inode)
1803{
1804	truncate_inode_pages_final(&inode->i_data);
1805
1806	invalidate_inode_buffers(inode);
1807	clear_inode(inode);
1808
1809	ni_clear(ntfs_i(inode));
1810}
1811
1812/*
1813 * ntfs_translate_junction
1814 *
1815 * Translate a Windows junction target to the Linux equivalent.
1816 * On junctions, targets are always absolute (they include the drive
1817 * letter). We have no way of knowing if the target is for the current
1818 * mounted device or not so we just assume it is.
1819 */
1820static int ntfs_translate_junction(const struct super_block *sb,
1821				   const struct dentry *link_de, char *target,
1822				   int target_len, int target_max)
1823{
1824	int tl_len, err = target_len;
1825	char *link_path_buffer = NULL, *link_path;
1826	char *translated = NULL;
1827	char *target_start;
1828	int copy_len;
1829
1830	link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS);
1831	if (!link_path_buffer) {
1832		err = -ENOMEM;
1833		goto out;
1834	}
1835	/* Get link path, relative to mount point */
1836	link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX);
1837	if (IS_ERR(link_path)) {
1838		ntfs_err(sb, "Error getting link path");
1839		err = -EINVAL;
1840		goto out;
1841	}
1842
1843	translated = kmalloc(PATH_MAX, GFP_NOFS);
1844	if (!translated) {
1845		err = -ENOMEM;
1846		goto out;
1847	}
1848
1849	/* Make translated path a relative path to mount point */
1850	strcpy(translated, "./");
1851	++link_path; /* Skip leading / */
1852	for (tl_len = sizeof("./") - 1; *link_path; ++link_path) {
1853		if (*link_path == '/') {
1854			if (PATH_MAX - tl_len < sizeof("../")) {
1855				ntfs_err(sb,
1856					 "Link path %s has too many components",
1857					 link_path);
1858				err = -EINVAL;
1859				goto out;
1860			}
1861			strcpy(translated + tl_len, "../");
1862			tl_len += sizeof("../") - 1;
1863		}
1864	}
1865
1866	/* Skip drive letter */
1867	target_start = target;
1868	while (*target_start && *target_start != ':')
1869		++target_start;
1870
1871	if (!*target_start) {
1872		ntfs_err(sb, "Link target (%s) missing drive separator",
1873			 target);
1874		err = -EINVAL;
1875		goto out;
1876	}
1877
1878	/* Skip drive separator and leading /, if exists */
1879	target_start += 1 + (target_start[1] == '/');
1880	copy_len = target_len - (target_start - target);
1881
1882	if (PATH_MAX - tl_len <= copy_len) {
1883		ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)",
1884			 target_start, PATH_MAX - tl_len, copy_len);
1885		err = -EINVAL;
1886		goto out;
1887	}
1888
1889	/* translated path has a trailing / and target_start does not */
1890	strcpy(translated + tl_len, target_start);
1891	tl_len += copy_len;
1892	if (target_max <= tl_len) {
1893		ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)",
1894			 translated, target_max, tl_len);
1895		err = -EINVAL;
1896		goto out;
1897	}
1898	strcpy(target, translated);
1899	err = tl_len;
1900
1901out:
1902	kfree(link_path_buffer);
1903	kfree(translated);
1904	return err;
1905}
1906
1907static noinline int ntfs_readlink_hlp(const struct dentry *link_de,
1908				      struct inode *inode, char *buffer,
1909				      int buflen)
1910{
1911	int i, err = -EINVAL;
1912	struct ntfs_inode *ni = ntfs_i(inode);
1913	struct super_block *sb = inode->i_sb;
1914	struct ntfs_sb_info *sbi = sb->s_fs_info;
1915	u64 size;
1916	u16 ulen = 0;
1917	void *to_free = NULL;
1918	struct REPARSE_DATA_BUFFER *rp;
1919	const __le16 *uname;
1920	struct ATTRIB *attr;
1921
1922	/* Reparse data present. Try to parse it. */
1923	static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
1924	static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
1925
1926	*buffer = 0;
1927
1928	attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1929	if (!attr)
1930		goto out;
1931
1932	if (!attr->non_res) {
1933		rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
1934		if (!rp)
1935			goto out;
1936		size = le32_to_cpu(attr->res.data_size);
1937	} else {
1938		size = le64_to_cpu(attr->nres.data_size);
1939		rp = NULL;
1940	}
1941
1942	if (size > sbi->reparse.max_size || size <= sizeof(u32))
1943		goto out;
1944
1945	if (!rp) {
1946		rp = kmalloc(size, GFP_NOFS);
1947		if (!rp) {
1948			err = -ENOMEM;
1949			goto out;
1950		}
1951		to_free = rp;
1952		/* Read into temporal buffer. */
1953		err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1954		if (err)
1955			goto out;
1956	}
1957
1958	/* Microsoft Tag. */
1959	switch (rp->ReparseTag) {
1960	case IO_REPARSE_TAG_MOUNT_POINT:
1961		/* Mount points and junctions. */
1962		/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1963		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1964				     MountPointReparseBuffer.PathBuffer))
1965			goto out;
1966		uname = Add2Ptr(rp,
1967				offsetof(struct REPARSE_DATA_BUFFER,
1968					 MountPointReparseBuffer.PathBuffer) +
1969					le16_to_cpu(rp->MountPointReparseBuffer
1970							    .PrintNameOffset));
1971		ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1972		break;
1973
1974	case IO_REPARSE_TAG_SYMLINK:
1975		/* FolderSymbolicLink */
1976		/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1977		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
1978				     SymbolicLinkReparseBuffer.PathBuffer))
1979			goto out;
1980		uname = Add2Ptr(
1981			rp, offsetof(struct REPARSE_DATA_BUFFER,
1982				     SymbolicLinkReparseBuffer.PathBuffer) +
1983				    le16_to_cpu(rp->SymbolicLinkReparseBuffer
1984							.PrintNameOffset));
1985		ulen = le16_to_cpu(
1986			rp->SymbolicLinkReparseBuffer.PrintNameLength);
1987		break;
1988
1989	case IO_REPARSE_TAG_CLOUD:
1990	case IO_REPARSE_TAG_CLOUD_1:
1991	case IO_REPARSE_TAG_CLOUD_2:
1992	case IO_REPARSE_TAG_CLOUD_3:
1993	case IO_REPARSE_TAG_CLOUD_4:
1994	case IO_REPARSE_TAG_CLOUD_5:
1995	case IO_REPARSE_TAG_CLOUD_6:
1996	case IO_REPARSE_TAG_CLOUD_7:
1997	case IO_REPARSE_TAG_CLOUD_8:
1998	case IO_REPARSE_TAG_CLOUD_9:
1999	case IO_REPARSE_TAG_CLOUD_A:
2000	case IO_REPARSE_TAG_CLOUD_B:
2001	case IO_REPARSE_TAG_CLOUD_C:
2002	case IO_REPARSE_TAG_CLOUD_D:
2003	case IO_REPARSE_TAG_CLOUD_E:
2004	case IO_REPARSE_TAG_CLOUD_F:
2005		err = sizeof("OneDrive") - 1;
2006		if (err > buflen)
2007			err = buflen;
2008		memcpy(buffer, "OneDrive", err);
2009		goto out;
2010
2011	default:
2012		if (IsReparseTagMicrosoft(rp->ReparseTag)) {
2013			/* Unknown Microsoft Tag. */
2014			goto out;
2015		}
2016		if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
2017		    size <= sizeof(struct REPARSE_POINT)) {
2018			goto out;
2019		}
2020
2021		/* Users tag. */
2022		uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
2023		ulen = le16_to_cpu(rp->ReparseDataLength) -
2024		       sizeof(struct REPARSE_POINT);
2025	}
2026
2027	/* Convert nlen from bytes to UNICODE chars. */
2028	ulen >>= 1;
2029
2030	/* Check that name is available. */
2031	if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
2032		goto out;
2033
2034	/* If name is already zero terminated then truncate it now. */
2035	if (!uname[ulen - 1])
2036		ulen -= 1;
2037
2038	err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
2039
2040	if (err < 0)
2041		goto out;
2042
2043	/* Translate Windows '\' into Linux '/'. */
2044	for (i = 0; i < err; i++) {
2045		if (buffer[i] == '\\')
2046			buffer[i] = '/';
2047	}
2048
2049	/* Always set last zero. */
2050	buffer[err] = 0;
2051
2052	/* If this is a junction, translate the link target. */
2053	if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
2054		err = ntfs_translate_junction(sb, link_de, buffer, err, buflen);
2055
2056out:
2057	kfree(to_free);
2058	return err;
2059}
2060
2061static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
2062				 struct delayed_call *done)
2063{
2064	int err;
2065	char *ret;
2066
2067	if (!de)
2068		return ERR_PTR(-ECHILD);
2069
2070	ret = kmalloc(PAGE_SIZE, GFP_NOFS);
2071	if (!ret)
2072		return ERR_PTR(-ENOMEM);
2073
2074	err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE);
2075	if (err < 0) {
2076		kfree(ret);
2077		return ERR_PTR(err);
2078	}
2079
2080	set_delayed_call(done, kfree_link, ret);
2081
2082	return ret;
2083}
2084
2085// clang-format off
2086const struct inode_operations ntfs_link_inode_operations = {
2087	.get_link	= ntfs_get_link,
2088	.setattr	= ntfs_setattr,
2089	.listxattr	= ntfs_listxattr,
2090};
2091
2092const struct address_space_operations ntfs_aops = {
2093	.read_folio	= ntfs_read_folio,
2094	.readahead	= ntfs_readahead,
2095	.writepages	= ntfs_writepages,
2096	.write_begin	= ntfs_write_begin,
2097	.write_end	= ntfs_write_end,
2098	.direct_IO	= ntfs_direct_IO,
2099	.bmap		= ntfs_bmap,
2100	.dirty_folio	= block_dirty_folio,
2101	.migrate_folio	= buffer_migrate_folio,
2102	.invalidate_folio = block_invalidate_folio,
2103};
2104
2105const struct address_space_operations ntfs_aops_cmpr = {
2106	.read_folio	= ntfs_read_folio,
2107	.dirty_folio	= block_dirty_folio,
2108	.direct_IO	= ntfs_direct_IO,
2109};
2110// clang-format on