inode.c 46.1 KB
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// SPDX-License-Identifier: GPL-2.0
/*
 *
 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
 *
 */

#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/mpage.h>
#include <linux/namei.h>
#include <linux/nls.h>
#include <linux/uio.h>
#include <linux/writeback.h>

#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"

/*
21
 * ntfs_read_mft - Read record and parses MFT.
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 */
static struct inode *ntfs_read_mft(struct inode *inode,
				   const struct cpu_str *name,
				   const struct MFT_REF *ref)
{
	int err = 0;
	struct ntfs_inode *ni = ntfs_i(inode);
	struct super_block *sb = inode->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	mode_t mode = 0;
	struct ATTR_STD_INFO5 *std5 = NULL;
	struct ATTR_LIST_ENTRY *le;
	struct ATTRIB *attr;
	bool is_match = false;
	bool is_root = false;
	bool is_dir;
	unsigned long ino = inode->i_ino;
	u32 rp_fa = 0, asize, t32;
	u16 roff, rsize, names = 0;
	const struct ATTR_FILE_NAME *fname = NULL;
	const struct INDEX_ROOT *root;
	struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
	u64 t64;
	struct MFT_REC *rec;
	struct runs_tree *run;

	inode->i_op = NULL;
	/* Setup 'uid' and 'gid' */
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	inode->i_uid = sbi->options->fs_uid;
	inode->i_gid = sbi->options->fs_gid;
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	err = mi_init(&ni->mi, sbi, ino);
	if (err)
		goto out;

	if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
		t64 = sbi->mft.lbo >> sbi->cluster_bits;
		t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
		sbi->mft.ni = ni;
		init_rwsem(&ni->file.run_lock);

		if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) {
			err = -ENOMEM;
			goto out;
		}
	}

	err = mi_read(&ni->mi, ino == MFT_REC_MFT);

	if (err)
		goto out;

	rec = ni->mi.mrec;

	if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
		;
	} else if (ref->seq != rec->seq) {
		err = -EINVAL;
		ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
			 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
		goto out;
	} else if (!is_rec_inuse(rec)) {
		err = -EINVAL;
		ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
		goto out;
	}

	if (le32_to_cpu(rec->total) != sbi->record_size) {
90
		/* Bad inode? */
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		err = -EINVAL;
		goto out;
	}

	if (!is_rec_base(rec))
		goto Ok;

98
	/* Record should contain $I30 root. */
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	is_dir = rec->flags & RECORD_FLAG_DIR;

	inode->i_generation = le16_to_cpu(rec->seq);

103
	/* Enumerate all struct Attributes MFT. */
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	le = NULL;
	attr = NULL;

	/*
108
	 * To reduce tab pressure use goto instead of
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	 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) ))
	 */
next_attr:
	run = NULL;
	err = -EINVAL;
	attr = ni_enum_attr_ex(ni, attr, &le, NULL);
	if (!attr)
		goto end_enum;

	if (le && le->vcn) {
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		/* This is non primary attribute segment. Ignore if not MFT. */
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		if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
			goto next_attr;

		run = &ni->file.run;
		asize = le32_to_cpu(attr->size);
		goto attr_unpack_run;
	}

	roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
	rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
	asize = le32_to_cpu(attr->size);

	switch (attr->type) {
	case ATTR_STD:
		if (attr->non_res ||
		    asize < sizeof(struct ATTR_STD_INFO) + roff ||
		    rsize < sizeof(struct ATTR_STD_INFO))
			goto out;

		if (std5)
			goto next_attr;

		std5 = Add2Ptr(attr, roff);

#ifdef STATX_BTIME
		nt2kernel(std5->cr_time, &ni->i_crtime);
#endif
		nt2kernel(std5->a_time, &inode->i_atime);
		nt2kernel(std5->c_time, &inode->i_ctime);
		nt2kernel(std5->m_time, &inode->i_mtime);

		ni->std_fa = std5->fa;

		if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
		    rsize >= sizeof(struct ATTR_STD_INFO5))
			ni->std_security_id = std5->security_id;
		goto next_attr;

	case ATTR_LIST:
		if (attr->name_len || le || ino == MFT_REC_LOG)
			goto out;

		err = ntfs_load_attr_list(ni, attr);
		if (err)
			goto out;

		le = NULL;
		attr = NULL;
		goto next_attr;

	case ATTR_NAME:
		if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
		    rsize < SIZEOF_ATTRIBUTE_FILENAME)
			goto out;

		fname = Add2Ptr(attr, roff);
		if (fname->type == FILE_NAME_DOS)
			goto next_attr;

		names += 1;
		if (name && name->len == fname->name_len &&
		    !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
					NULL, false))
			is_match = true;

		goto next_attr;

	case ATTR_DATA:
		if (is_dir) {
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			/* Ignore data attribute in dir record. */
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			goto next_attr;
		}

		if (ino == MFT_REC_BADCLUST && !attr->non_res)
			goto next_attr;

		if (attr->name_len &&
		    ((ino != MFT_REC_BADCLUST || !attr->non_res ||
		      attr->name_len != ARRAY_SIZE(BAD_NAME) ||
		      memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
		     (ino != MFT_REC_SECURE || !attr->non_res ||
		      attr->name_len != ARRAY_SIZE(SDS_NAME) ||
		      memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
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			/* File contains stream attribute. Ignore it. */
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			goto next_attr;
		}

		if (is_attr_sparsed(attr))
			ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
		else
			ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;

		if (is_attr_compressed(attr))
			ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
		else
			ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;

		if (is_attr_encrypted(attr))
			ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
		else
			ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;

		if (!attr->non_res) {
			ni->i_valid = inode->i_size = rsize;
			inode_set_bytes(inode, rsize);
		}

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		mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
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		if (!attr->non_res) {
			ni->ni_flags |= NI_FLAG_RESIDENT;
			goto next_attr;
		}

		inode_set_bytes(inode, attr_ondisk_size(attr));

		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
		inode->i_size = le64_to_cpu(attr->nres.data_size);
		if (!attr->nres.alloc_size)
			goto next_attr;

		run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run
					    : &ni->file.run;
		break;

	case ATTR_ROOT:
		if (attr->non_res)
			goto out;

		root = Add2Ptr(attr, roff);
		is_root = true;

		if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
			goto next_attr;

		if (root->type != ATTR_NAME ||
		    root->rule != NTFS_COLLATION_TYPE_FILENAME)
			goto out;

		if (!is_dir)
			goto next_attr;

		ni->ni_flags |= NI_FLAG_DIR;

		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
		if (err)
			goto out;

		mode = sb->s_root
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			       ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
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			       : (S_IFDIR | 0777);
		goto next_attr;

	case ATTR_ALLOC:
		if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
		    memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
			goto next_attr;

		inode->i_size = le64_to_cpu(attr->nres.data_size);
		ni->i_valid = le64_to_cpu(attr->nres.valid_size);
		inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));

		run = &ni->dir.alloc_run;
		break;

	case ATTR_BITMAP:
		if (ino == MFT_REC_MFT) {
			if (!attr->non_res)
				goto out;
#ifndef CONFIG_NTFS3_64BIT_CLUSTER
			/* 0x20000000 = 2^32 / 8 */
			if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
				goto out;
#endif
			run = &sbi->mft.bitmap.run;
			break;
		} else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
			   !memcmp(attr_name(attr), I30_NAME,
				   sizeof(I30_NAME)) &&
			   attr->non_res) {
			run = &ni->dir.bitmap_run;
			break;
		}
		goto next_attr;

	case ATTR_REPARSE:
		if (attr->name_len)
			goto next_attr;

		rp_fa = ni_parse_reparse(ni, attr, &rp);
		switch (rp_fa) {
		case REPARSE_LINK:
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			/*
			 * Normal symlink.
			 * Assume one unicode symbol == one utf8.
			 */
			inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
							    .PrintNameLength) /
					sizeof(u16);
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			ni->i_valid = inode->i_size;

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			/* Clear directory bit. */
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			if (ni->ni_flags & NI_FLAG_DIR) {
				indx_clear(&ni->dir);
				memset(&ni->dir, 0, sizeof(ni->dir));
				ni->ni_flags &= ~NI_FLAG_DIR;
			} else {
				run_close(&ni->file.run);
			}
			mode = S_IFLNK | 0777;
			is_dir = false;
			if (attr->non_res) {
				run = &ni->file.run;
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				goto attr_unpack_run; // Double break.
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			}
			break;

		case REPARSE_COMPRESSED:
			break;

		case REPARSE_DEDUPLICATED:
			break;
		}
		goto next_attr;

	case ATTR_EA_INFO:
		if (!attr->name_len &&
		    resident_data_ex(attr, sizeof(struct EA_INFO))) {
			ni->ni_flags |= NI_FLAG_EA;
			/*
			 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode
			 */
			inode->i_mode = mode;
			ntfs_get_wsl_perm(inode);
			mode = inode->i_mode;
		}
		goto next_attr;

	default:
		goto next_attr;
	}

attr_unpack_run:
	roff = le16_to_cpu(attr->nres.run_off);

	t64 = le64_to_cpu(attr->nres.svcn);
	err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn),
			    t64, Add2Ptr(attr, roff), asize - roff);
	if (err < 0)
		goto out;
	err = 0;
	goto next_attr;

end_enum:

	if (!std5)
		goto out;

	if (!is_match && name) {
381
		/* Reuse rec as buffer for ascii name. */
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		err = -ENOENT;
		goto out;
	}

	if (std5->fa & FILE_ATTRIBUTE_READONLY)
		mode &= ~0222;

	if (!names) {
		err = -EINVAL;
		goto out;
	}

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	if (names != le16_to_cpu(rec->hard_links)) {
		/* Correct minor error on the fly. Do not mark inode as dirty. */
		rec->hard_links = cpu_to_le16(names);
		ni->mi.dirty = true;
	}

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	set_nlink(inode, names);

	if (S_ISDIR(mode)) {
		ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;

		/*
406
		 * Dot and dot-dot should be included in count but was not
407
		 * included in enumeration.
408
		 * Usually a hard links to directories are disabled.
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		 */
		inode->i_op = &ntfs_dir_inode_operations;
		inode->i_fop = &ntfs_dir_operations;
		ni->i_valid = 0;
	} else if (S_ISLNK(mode)) {
		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
		inode->i_op = &ntfs_link_inode_operations;
		inode->i_fop = NULL;
417
		inode_nohighmem(inode);
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	} else if (S_ISREG(mode)) {
		ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
		inode->i_op = &ntfs_file_inode_operations;
		inode->i_fop = &ntfs_file_operations;
		inode->i_mapping->a_ops =
			is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
		if (ino != MFT_REC_MFT)
			init_rwsem(&ni->file.run_lock);
	} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
		   S_ISSOCK(mode)) {
		inode->i_op = &ntfs_special_inode_operations;
		init_special_inode(inode, mode, inode->i_rdev);
	} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
		   fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
432
		/* Records in $Extend are not a files or general directories. */
433
		inode->i_op = &ntfs_file_inode_operations;
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	} else {
		err = -EINVAL;
		goto out;
	}

439
	if ((sbi->options->sys_immutable &&
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	     (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
	    !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
		inode->i_flags |= S_IMMUTABLE;
	} else {
		inode->i_flags &= ~S_IMMUTABLE;
	}

	inode->i_mode = mode;
	if (!(ni->ni_flags & NI_FLAG_EA)) {
449
		/* If no xattr then no security (stored in xattr). */
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		inode->i_flags |= S_NOSEC;
	}

Ok:
	if (ino == MFT_REC_MFT && !sb->s_root)
		sbi->mft.ni = NULL;

	unlock_new_inode(inode);

	return inode;

out:
	if (ino == MFT_REC_MFT && !sb->s_root)
		sbi->mft.ni = NULL;

	iget_failed(inode);
	return ERR_PTR(err);
}

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/*
 * ntfs_test_inode
 *
 * Return: 1 if match.
 */
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static int ntfs_test_inode(struct inode *inode, void *data)
{
	struct MFT_REF *ref = data;

	return ino_get(ref) == inode->i_ino;
}

static int ntfs_set_inode(struct inode *inode, void *data)
{
	const struct MFT_REF *ref = data;

	inode->i_ino = ino_get(ref);
	return 0;
}

struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
			 const struct cpu_str *name)
{
	struct inode *inode;

	inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
			     (void *)ref);
	if (unlikely(!inode))
		return ERR_PTR(-ENOMEM);

	/* If this is a freshly allocated inode, need to read it now. */
	if (inode->i_state & I_NEW)
		inode = ntfs_read_mft(inode, name, ref);
	else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
503
		/* Inode overlaps? */
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		make_bad_inode(inode);
	}

	return inode;
}

enum get_block_ctx {
	GET_BLOCK_GENERAL = 0,
	GET_BLOCK_WRITE_BEGIN = 1,
	GET_BLOCK_DIRECT_IO_R = 2,
	GET_BLOCK_DIRECT_IO_W = 3,
	GET_BLOCK_BMAP = 4,
};

static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
				       struct buffer_head *bh, int create,
				       enum get_block_ctx ctx)
{
	struct super_block *sb = inode->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_inode *ni = ntfs_i(inode);
	struct page *page = bh->b_page;
	u8 cluster_bits = sbi->cluster_bits;
	u32 block_size = sb->s_blocksize;
	u64 bytes, lbo, valid;
	u32 off;
	int err;
	CLST vcn, lcn, len;
	bool new;

534
	/* Clear previous state. */
535 536 537
	clear_buffer_new(bh);
	clear_buffer_uptodate(bh);

538
	/* Direct write uses 'create=0'. */
539
	if (!create && vbo >= ni->i_valid) {
540
		/* Out of valid. */
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		return 0;
	}

	if (vbo >= inode->i_size) {
545
		/* Out of size. */
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		return 0;
	}

	if (is_resident(ni)) {
		ni_lock(ni);
		err = attr_data_read_resident(ni, page);
		ni_unlock(ni);

		if (!err)
			set_buffer_uptodate(bh);
		bh->b_size = block_size;
		return err;
	}

	vcn = vbo >> cluster_bits;
	off = vbo & sbi->cluster_mask;
	new = false;

	err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
	if (err)
		goto out;

	if (!len)
		return 0;

	bytes = ((u64)len << cluster_bits) - off;

	if (lcn == SPARSE_LCN) {
		if (!create) {
			if (bh->b_size > bytes)
				bh->b_size = bytes;
			return 0;
		}
		WARN_ON(1);
	}

	if (new) {
		set_buffer_new(bh);
		if ((len << cluster_bits) > block_size)
			ntfs_sparse_cluster(inode, page, vcn, len);
	}

	lbo = ((u64)lcn << cluster_bits) + off;

	set_buffer_mapped(bh);
	bh->b_bdev = sb->s_bdev;
	bh->b_blocknr = lbo >> sb->s_blocksize_bits;

	valid = ni->i_valid;

	if (ctx == GET_BLOCK_DIRECT_IO_W) {
597
		/* ntfs_direct_IO will update ni->i_valid. */
598 599 600
		if (vbo >= valid)
			set_buffer_new(bh);
	} else if (create) {
601
		/* Normal write. */
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		if (bytes > bh->b_size)
			bytes = bh->b_size;

		if (vbo >= valid)
			set_buffer_new(bh);

		if (vbo + bytes > valid) {
			ni->i_valid = vbo + bytes;
			mark_inode_dirty(inode);
		}
	} else if (vbo >= valid) {
613 614
		/* Read out of valid data. */
		/* Should never be here 'cause already checked. */
615 616
		clear_buffer_mapped(bh);
	} else if (vbo + bytes <= valid) {
617
		/* Normal read. */
618
	} else if (vbo + block_size <= valid) {
619
		/* Normal short read. */
620 621 622
		bytes = block_size;
	} else {
		/*
623
		 * Read across valid size: vbo < valid && valid < vbo + block_size
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		 */
		bytes = block_size;

		if (page) {
			u32 voff = valid - vbo;

			bh->b_size = block_size;
			off = vbo & (PAGE_SIZE - 1);
			set_bh_page(bh, page, off);
			ll_rw_block(REQ_OP_READ, 0, 1, &bh);
			wait_on_buffer(bh);
			if (!buffer_uptodate(bh)) {
				err = -EIO;
				goto out;
			}
			zero_user_segment(page, off + voff, off + block_size);
		}
	}

	if (bh->b_size > bytes)
		bh->b_size = bytes;

#ifndef __LP64__
	if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
		static_assert(sizeof(size_t) < sizeof(loff_t));
		if (bytes > 0x40000000u)
			bh->b_size = 0x40000000u;
	}
#endif

	return 0;

out:
	return err;
}

int ntfs_get_block(struct inode *inode, sector_t vbn,
		   struct buffer_head *bh_result, int create)
{
	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
				  bh_result, create, GET_BLOCK_GENERAL);
}

static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
			       struct buffer_head *bh_result, int create)
{
	return ntfs_get_block_vbo(inode,
				  (u64)vsn << inode->i_sb->s_blocksize_bits,
				  bh_result, create, GET_BLOCK_BMAP);
}

static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
}

static int ntfs_readpage(struct file *file, struct page *page)
{
	int err;
	struct address_space *mapping = page->mapping;
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);

	if (is_resident(ni)) {
		ni_lock(ni);
		err = attr_data_read_resident(ni, page);
		ni_unlock(ni);
		if (err != E_NTFS_NONRESIDENT) {
			unlock_page(page);
			return err;
		}
	}

	if (is_compressed(ni)) {
		ni_lock(ni);
		err = ni_readpage_cmpr(ni, page);
		ni_unlock(ni);
		return err;
	}

704
	/* Normal + sparse files. */
705 706 707 708 709 710 711 712 713 714 715 716
	return mpage_readpage(page, ntfs_get_block);
}

static void ntfs_readahead(struct readahead_control *rac)
{
	struct address_space *mapping = rac->mapping;
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);
	u64 valid;
	loff_t pos;

	if (is_resident(ni)) {
717
		/* No readahead for resident. */
718 719 720 721
		return;
	}

	if (is_compressed(ni)) {
722
		/* No readahead for compressed. */
723 724 725 726 727 728 729 730
		return;
	}

	valid = ni->i_valid;
	pos = readahead_pos(rac);

	if (valid < i_size_read(inode) && pos <= valid &&
	    valid < pos + readahead_length(rac)) {
731
		/* Range cross 'valid'. Read it page by page. */
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
		return;
	}

	mpage_readahead(rac, ntfs_get_block);
}

static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
				      struct buffer_head *bh_result, int create)
{
	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
				  bh_result, create, GET_BLOCK_DIRECT_IO_R);
}

static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
				      struct buffer_head *bh_result, int create)
{
	return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
				  bh_result, create, GET_BLOCK_DIRECT_IO_W);
}

static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
	struct file *file = iocb->ki_filp;
	struct address_space *mapping = file->f_mapping;
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);
	loff_t vbo = iocb->ki_pos;
	loff_t end;
	int wr = iov_iter_rw(iter) & WRITE;
761
	size_t iter_count = iov_iter_count(iter);
762 763 764 765
	loff_t valid;
	ssize_t ret;

	if (is_resident(ni)) {
766
		/* Switch to buffered write. */
767 768 769 770 771 772 773 774
		ret = 0;
		goto out;
	}

	ret = blockdev_direct_IO(iocb, inode, iter,
				 wr ? ntfs_get_block_direct_IO_W
				    : ntfs_get_block_direct_IO_R);

775 776 777 778 779
	if (ret > 0)
		end = vbo + ret;
	else if (wr && ret == -EIOCBQUEUED)
		end = vbo + iter_count;
	else
780 781 782 783 784 785 786 787 788
		goto out;

	valid = ni->i_valid;
	if (wr) {
		if (end > valid && !S_ISBLK(inode->i_mode)) {
			ni->i_valid = end;
			mark_inode_dirty(inode);
		}
	} else if (vbo < valid && valid < end) {
789
		/* Fix page. */
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
		iov_iter_revert(iter, end - valid);
		iov_iter_zero(end - valid, iter);
	}

out:
	return ret;
}

int ntfs_set_size(struct inode *inode, u64 new_size)
{
	struct super_block *sb = inode->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	struct ntfs_inode *ni = ntfs_i(inode);
	int err;

805
	/* Check for maximum file size. */
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
	if (is_sparsed(ni) || is_compressed(ni)) {
		if (new_size > sbi->maxbytes_sparse) {
			err = -EFBIG;
			goto out;
		}
	} else if (new_size > sbi->maxbytes) {
		err = -EFBIG;
		goto out;
	}

	ni_lock(ni);
	down_write(&ni->file.run_lock);

	err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
			    &ni->i_valid, true, NULL);

	up_write(&ni->file.run_lock);
	ni_unlock(ni);

	mark_inode_dirty(inode);

out:
	return err;
}

static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
{
	struct address_space *mapping = page->mapping;
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);
	int err;

	if (is_resident(ni)) {
		ni_lock(ni);
		err = attr_data_write_resident(ni, page);
		ni_unlock(ni);
		if (err != E_NTFS_NONRESIDENT) {
			unlock_page(page);
			return err;
		}
	}

	return block_write_full_page(page, ntfs_get_block, wbc);
}

static int ntfs_writepages(struct address_space *mapping,
			   struct writeback_control *wbc)
{
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);
856
	/* Redirect call to 'ntfs_writepage' for resident files. */
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
	get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block;

	return mpage_writepages(mapping, wbc, get_block);
}

static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
				      struct buffer_head *bh_result, int create)
{
	return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
				  bh_result, create, GET_BLOCK_WRITE_BEGIN);
}

static int ntfs_write_begin(struct file *file, struct address_space *mapping,
			    loff_t pos, u32 len, u32 flags, struct page **pagep,
			    void **fsdata)
{
	int err;
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);

	*pagep = NULL;
	if (is_resident(ni)) {
		struct page *page = grab_cache_page_write_begin(
			mapping, pos >> PAGE_SHIFT, flags);

		if (!page) {
			err = -ENOMEM;
			goto out;
		}

		ni_lock(ni);
		err = attr_data_read_resident(ni, page);
		ni_unlock(ni);

		if (!err) {
			*pagep = page;
			goto out;
		}
		unlock_page(page);
		put_page(page);

		if (err != E_NTFS_NONRESIDENT)
			goto out;
	}

	err = block_write_begin(mapping, pos, len, flags, pagep,
				ntfs_get_block_write_begin);

out:
	return err;
}

909 910 911
/*
 * ntfs_write_end - Address_space_operations::write_end.
 */
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
static int ntfs_write_end(struct file *file, struct address_space *mapping,
			  loff_t pos, u32 len, u32 copied, struct page *page,
			  void *fsdata)

{
	struct inode *inode = mapping->host;
	struct ntfs_inode *ni = ntfs_i(inode);
	u64 valid = ni->i_valid;
	bool dirty = false;
	int err;

	if (is_resident(ni)) {
		ni_lock(ni);
		err = attr_data_write_resident(ni, page);
		ni_unlock(ni);
		if (!err) {
			dirty = true;
929
			/* Clear any buffers in page. */
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
			if (page_has_buffers(page)) {
				struct buffer_head *head, *bh;

				bh = head = page_buffers(page);
				do {
					clear_buffer_dirty(bh);
					clear_buffer_mapped(bh);
					set_buffer_uptodate(bh);
				} while (head != (bh = bh->b_this_page));
			}
			SetPageUptodate(page);
			err = copied;
		}
		unlock_page(page);
		put_page(page);
	} else {
		err = generic_write_end(file, mapping, pos, len, copied, page,
					fsdata);
	}

	if (err >= 0) {
		if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
			inode->i_ctime = inode->i_mtime = current_time(inode);
			ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
			dirty = true;
		}

		if (valid != ni->i_valid) {
958
			/* ni->i_valid is changed in ntfs_get_block_vbo. */
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
			dirty = true;
		}

		if (dirty)
			mark_inode_dirty(inode);
	}

	return err;
}

int reset_log_file(struct inode *inode)
{
	int err;
	loff_t pos = 0;
	u32 log_size = inode->i_size;
	struct address_space *mapping = inode->i_mapping;

	for (;;) {
		u32 len;
		void *kaddr;
		struct page *page;

		len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;

		err = block_write_begin(mapping, pos, len, 0, &page,
					ntfs_get_block_write_begin);
		if (err)
			goto out;

		kaddr = kmap_atomic(page);
		memset(kaddr, -1, len);
		kunmap_atomic(kaddr);
		flush_dcache_page(page);

		err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
		if (err < 0)
			goto out;
		pos += len;

		if (pos >= log_size)
			break;
		balance_dirty_pages_ratelimited(mapping);
	}
out:
	mark_inode_dirty_sync(inode);

	return err;
}

int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}

int ntfs_sync_inode(struct inode *inode)
{
	return _ni_write_inode(inode, 1);
}

/*
1019 1020 1021 1022 1023
 * writeback_inode - Helper function for ntfs_flush_inodes().
 *
 * This writes both the inode and the file data blocks, waiting
 * for in flight data blocks before the start of the call.  It
 * does not wait for any io started during the call.
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
 */
static int writeback_inode(struct inode *inode)
{
	int ret = sync_inode_metadata(inode, 0);

	if (!ret)
		ret = filemap_fdatawrite(inode->i_mapping);
	return ret;
}

/*
1035 1036 1037
 * ntfs_flush_inodes
 *
 * Write data and metadata corresponding to i1 and i2.  The io is
1038 1039
 * started but we do not wait for any of it to finish.
 *
1040
 * filemap_flush() is used for the block device, so if there is a dirty
1041
 * page for a block already in flight, we will not wait and start the
1042
 * io over again.
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
 */
int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
		      struct inode *i2)
{
	int ret = 0;

	if (i1)
		ret = writeback_inode(i1);
	if (!ret && i2)
		ret = writeback_inode(i2);
	if (!ret)
1054
		ret = sync_blockdev_nowait(sb->s_bdev);
1055 1056 1057 1058 1059 1060 1061
	return ret;
}

int inode_write_data(struct inode *inode, const void *data, size_t bytes)
{
	pgoff_t idx;

1062
	/* Write non resident data. */
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	for (idx = 0; bytes; idx++) {
		size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
		struct page *page = ntfs_map_page(inode->i_mapping, idx);

		if (IS_ERR(page))
			return PTR_ERR(page);

		lock_page(page);
		WARN_ON(!PageUptodate(page));
		ClearPageUptodate(page);

		memcpy(page_address(page), data, op);

		flush_dcache_page(page);
		SetPageUptodate(page);
		unlock_page(page);

		ntfs_unmap_page(page);

		bytes -= op;
		data = Add2Ptr(data, PAGE_SIZE);
	}
	return 0;
}

/*
1089 1090
 * ntfs_reparse_bytes
 *
1091
 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
1092
 * for unicode string of @uni_len length.
1093 1094 1095
 */
static inline u32 ntfs_reparse_bytes(u32 uni_len)
{
1096
	/* Header + unicode string + decorated unicode string. */
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	return sizeof(short) * (2 * uni_len + 4) +
	       offsetof(struct REPARSE_DATA_BUFFER,
			SymbolicLinkReparseBuffer.PathBuffer);
}

static struct REPARSE_DATA_BUFFER *
ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
			   u32 size, u16 *nsize)
{
	int i, err;
	struct REPARSE_DATA_BUFFER *rp;
	__le16 *rp_name;
	typeof(rp->SymbolicLinkReparseBuffer) *rs;

1111
	rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
1112 1113 1114 1115 1116 1117
	if (!rp)
		return ERR_PTR(-ENOMEM);

	rs = &rp->SymbolicLinkReparseBuffer;
	rp_name = rs->PathBuffer;

1118
	/* Convert link name to UTF-16. */
1119 1120 1121 1122 1123 1124
	err = ntfs_nls_to_utf16(sbi, symname, size,
				(struct cpu_str *)(rp_name - 1), 2 * size,
				UTF16_LITTLE_ENDIAN);
	if (err < 0)
		goto out;

1125
	/* err = the length of unicode name of symlink. */
1126 1127 1128 1129 1130 1131 1132
	*nsize = ntfs_reparse_bytes(err);

	if (*nsize > sbi->reparse.max_size) {
		err = -EFBIG;
		goto out;
	}

1133
	/* Translate Linux '/' into Windows '\'. */
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
	for (i = 0; i < err; i++) {
		if (rp_name[i] == cpu_to_le16('/'))
			rp_name[i] = cpu_to_le16('\\');
	}

	rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
	rp->ReparseDataLength =
		cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER,
					      SymbolicLinkReparseBuffer));

1144
	/* PrintName + SubstituteName. */
1145 1146 1147 1148 1149
	rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
	rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
	rs->PrintNameLength = rs->SubstituteNameOffset;

	/*
1150 1151 1152
	 * TODO: Use relative path if possible to allow Windows to
	 * parse this path.
	 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
1153 1154 1155 1156 1157
	 */
	rs->Flags = 0;

	memmove(rp_name + err + 4, rp_name, sizeof(short) * err);

1158
	/* Decorate SubstituteName. */
1159 1160 1161 1162 1163 1164 1165 1166
	rp_name += err;
	rp_name[0] = cpu_to_le16('\\');
	rp_name[1] = cpu_to_le16('?');
	rp_name[2] = cpu_to_le16('?');
	rp_name[3] = cpu_to_le16('\\');

	return rp;
out:
1167
	kfree(rp);
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
	return ERR_PTR(err);
}

struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
				struct inode *dir, struct dentry *dentry,
				const struct cpu_str *uni, umode_t mode,
				dev_t dev, const char *symname, u32 size,
				struct ntfs_fnd *fnd)
{
	int err;
	struct super_block *sb = dir->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
	const struct qstr *name = &dentry->d_name;
	CLST ino = 0;
	struct ntfs_inode *dir_ni = ntfs_i(dir);
	struct ntfs_inode *ni = NULL;
	struct inode *inode = NULL;
	struct ATTRIB *attr;
	struct ATTR_STD_INFO5 *std5;
	struct ATTR_FILE_NAME *fname;
	struct MFT_REC *rec;
	u32 asize, dsize, sd_size;
	enum FILE_ATTRIBUTE fa;
	__le32 security_id = SECURITY_ID_INVALID;
	CLST vcn;
	const void *sd;
	u16 t16, nsize = 0, aid = 0;
	struct INDEX_ROOT *root, *dir_root;
	struct NTFS_DE *e, *new_de = NULL;
	struct REPARSE_DATA_BUFFER *rp = NULL;
	bool rp_inserted = false;

1200 1201
	ni_lock_dir(dir_ni);

1202
	dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
1203 1204 1205 1206
	if (!dir_root) {
		err = -EINVAL;
		goto out1;
	}
1207 1208

	if (S_ISDIR(mode)) {
1209
		/* Use parent's directory attributes. */
1210 1211 1212
		fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
		     FILE_ATTRIBUTE_ARCHIVE;
		/*
1213 1214 1215
		 * By default child directory inherits parent attributes.
		 * Root directory is hidden + system.
		 * Make an exception for children in root.
1216 1217 1218 1219 1220 1221 1222 1223
		 */
		if (dir->i_ino == MFT_REC_ROOT)
			fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
	} else if (S_ISLNK(mode)) {
		/* It is good idea that link should be the same type (file/dir) as target */
		fa = FILE_ATTRIBUTE_REPARSE_POINT;

		/*
1224 1225
		 * Linux: there are dir/file/symlink and so on.
		 * NTFS: symlinks are "dir + reparse" or "file + reparse"
1226 1227 1228 1229
		 * It is good idea to create:
		 * dir + reparse if 'symname' points to directory
		 * or
		 * file + reparse if 'symname' points to file
1230
		 * Unfortunately kern_path hangs if symname contains 'dir'.
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
		 */

		/*
		 *	struct path path;
		 *
		 *	if (!kern_path(symname, LOOKUP_FOLLOW, &path)){
		 *		struct inode *target = d_inode(path.dentry);
		 *
		 *		if (S_ISDIR(target->i_mode))
		 *			fa |= FILE_ATTRIBUTE_DIRECTORY;
		 *		// if ( target->i_sb == sb ){
		 *		//	use relative path?
		 *		// }
		 *		path_put(&path);
		 *	}
		 */
	} else if (S_ISREG(mode)) {
1248
		if (sbi->options->sparse) {
1249
			/* Sparsed regular file, cause option 'sparse'. */
1250 1251 1252
			fa = FILE_ATTRIBUTE_SPARSE_FILE |
			     FILE_ATTRIBUTE_ARCHIVE;
		} else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
1253
			/* Compressed regular file, if parent is compressed. */
1254 1255
			fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
		} else {
1256
			/* Regular file, default attributes. */
1257 1258 1259 1260 1261 1262 1263 1264 1265
			fa = FILE_ATTRIBUTE_ARCHIVE;
		}
	} else {
		fa = FILE_ATTRIBUTE_ARCHIVE;
	}

	if (!(mode & 0222))
		fa |= FILE_ATTRIBUTE_READONLY;

1266
	/* Allocate PATH_MAX bytes. */
1267 1268 1269 1270 1271 1272
	new_de = __getname();
	if (!new_de) {
		err = -ENOMEM;
		goto out1;
	}

1273
	/* Mark rw ntfs as dirty. it will be cleared at umount. */
1274 1275
	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);

1276
	/* Step 1: allocate and fill new mft record. */
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
	if (err)
		goto out2;

	ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY);
	if (IS_ERR(ni)) {
		err = PTR_ERR(ni);
		ni = NULL;
		goto out3;
	}
	inode = &ni->vfs_inode;
	inode_init_owner(mnt_userns, inode, dir, mode);
1289
	mode = inode->i_mode;
1290 1291 1292 1293 1294 1295 1296 1297

	inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
		current_time(inode);

	rec = ni->mi.mrec;
	rec->hard_links = cpu_to_le16(1);
	attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));

1298
	/* Get default security id. */
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
	sd = s_default_security;
	sd_size = sizeof(s_default_security);

	if (is_ntfs3(sbi)) {
		security_id = dir_ni->std_security_id;
		if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
			security_id = sbi->security.def_security_id;

			if (security_id == SECURITY_ID_INVALID &&
			    !ntfs_insert_security(sbi, sd, sd_size,
						  &security_id, NULL))
				sbi->security.def_security_id = security_id;
		}
	}

1314
	/* Insert standard info. */
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
	std5 = Add2Ptr(attr, SIZEOF_RESIDENT);

	if (security_id == SECURITY_ID_INVALID) {
		dsize = sizeof(struct ATTR_STD_INFO);
	} else {
		dsize = sizeof(struct ATTR_STD_INFO5);
		std5->security_id = security_id;
		ni->std_security_id = security_id;
	}
	asize = SIZEOF_RESIDENT + dsize;

	attr->type = ATTR_STD;
	attr->size = cpu_to_le32(asize);
	attr->id = cpu_to_le16(aid++);
	attr->res.data_off = SIZEOF_RESIDENT_LE;
	attr->res.data_size = cpu_to_le32(dsize);

	std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
		kernel2nt(&inode->i_atime);

	ni->std_fa = fa;
	std5->fa = fa;

	attr = Add2Ptr(attr, asize);

1340
	/* Insert file name. */
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	err = fill_name_de(sbi, new_de, name, uni);
	if (err)
		goto out4;

	mi_get_ref(&ni->mi, &new_de->ref);

	fname = (struct ATTR_FILE_NAME *)(new_de + 1);
	mi_get_ref(&dir_ni->mi, &fname->home);
	fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
		fname->dup.a_time = std5->cr_time;
	fname->dup.alloc_size = fname->dup.data_size = 0;
	fname->dup.fa = std5->fa;
	fname->dup.ea_size = fname->dup.reparse = 0;

	dsize = le16_to_cpu(new_de->key_size);
1356
	asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368

	attr->type = ATTR_NAME;
	attr->size = cpu_to_le32(asize);
	attr->res.data_off = SIZEOF_RESIDENT_LE;
	attr->res.flags = RESIDENT_FLAG_INDEXED;
	attr->id = cpu_to_le16(aid++);
	attr->res.data_size = cpu_to_le32(dsize);
	memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);

	attr = Add2Ptr(attr, asize);

	if (security_id == SECURITY_ID_INVALID) {
1369
		/* Insert security attribute. */
1370
		asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381

		attr->type = ATTR_SECURE;
		attr->size = cpu_to_le32(asize);
		attr->id = cpu_to_le16(aid++);
		attr->res.data_off = SIZEOF_RESIDENT_LE;
		attr->res.data_size = cpu_to_le32(sd_size);
		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);

		attr = Add2Ptr(attr, asize);
	}

1382
	attr->id = cpu_to_le16(aid++);
1383 1384
	if (fa & FILE_ATTRIBUTE_DIRECTORY) {
		/*
1385 1386
		 * Regular directory or symlink to directory.
		 * Create root attribute.
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414
		 */
		dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
		asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;

		attr->type = ATTR_ROOT;
		attr->size = cpu_to_le32(asize);

		attr->name_len = ARRAY_SIZE(I30_NAME);
		attr->name_off = SIZEOF_RESIDENT_LE;
		attr->res.data_off =
			cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
		attr->res.data_size = cpu_to_le32(dsize);
		memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
		       sizeof(I30_NAME));

		root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
		memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
		root->ihdr.de_off =
			cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
		root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
					      sizeof(struct NTFS_DE));
		root->ihdr.total = root->ihdr.used;

		e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
		e->size = cpu_to_le16(sizeof(struct NTFS_DE));
		e->flags = NTFS_IE_LAST;
	} else if (S_ISLNK(mode)) {
		/*
1415 1416
		 * Symlink to file.
		 * Create empty resident data attribute.
1417 1418 1419
		 */
		asize = SIZEOF_RESIDENT;

1420
		/* Insert empty ATTR_DATA */
1421 1422 1423 1424
		attr->type = ATTR_DATA;
		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
		attr->name_off = SIZEOF_RESIDENT_LE;
		attr->res.data_off = SIZEOF_RESIDENT_LE;
1425
	} else if (S_ISREG(mode)) {
1426
		/*
1427
		 * Regular file. Create empty non resident data attribute.
1428 1429
		 */
		attr->type = ATTR_DATA;
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
		attr->non_res = 1;
		attr->nres.evcn = cpu_to_le64(-1ll);
		if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
			attr->flags = ATTR_FLAG_SPARSED;
			asize = SIZEOF_NONRESIDENT_EX + 8;
		} else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
			attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
			attr->flags = ATTR_FLAG_COMPRESSED;
			attr->nres.c_unit = COMPRESSION_UNIT;
			asize = SIZEOF_NONRESIDENT_EX + 8;
1443
		} else {
1444 1445 1446
			attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
			attr->name_off = SIZEOF_NONRESIDENT_LE;
			asize = SIZEOF_NONRESIDENT + 8;
1447
		}
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
		attr->nres.run_off = attr->name_off;
	} else {
		/*
		 * Node. Create empty resident data attribute.
		 */
		attr->type = ATTR_DATA;
		attr->size = cpu_to_le32(SIZEOF_RESIDENT);
		attr->name_off = SIZEOF_RESIDENT_LE;
		if (fa & FILE_ATTRIBUTE_SPARSE_FILE)
			attr->flags = ATTR_FLAG_SPARSED;
		else if (fa & FILE_ATTRIBUTE_COMPRESSED)
			attr->flags = ATTR_FLAG_COMPRESSED;
		attr->res.data_off = SIZEOF_RESIDENT_LE;
		asize = SIZEOF_RESIDENT;
		ni->ni_flags |= NI_FLAG_RESIDENT;
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479
	}

	if (S_ISDIR(mode)) {
		ni->ni_flags |= NI_FLAG_DIR;
		err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
		if (err)
			goto out4;
	} else if (S_ISLNK(mode)) {
		rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize);

		if (IS_ERR(rp)) {
			err = PTR_ERR(rp);
			rp = NULL;
			goto out4;
		}

		/*
1480
		 * Insert ATTR_REPARSE.
1481 1482 1483 1484 1485
		 */
		attr = Add2Ptr(attr, asize);
		attr->type = ATTR_REPARSE;
		attr->id = cpu_to_le16(aid++);

1486
		/* Resident or non resident? */
1487
		asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
1488 1489
		t16 = PtrOffset(rec, attr);

1490 1491 1492 1493
		/*
		 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
		 * It is good idea to keep extened attributes resident.
		 */
1494
		if (asize + t16 + 0x78 + 8 > sbi->record_size) {
1495 1496 1497
			CLST alen;
			CLST clst = bytes_to_cluster(sbi, nsize);

1498
			/* Bytes per runs. */
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
			t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;

			attr->non_res = 1;
			attr->nres.evcn = cpu_to_le64(clst - 1);
			attr->name_off = SIZEOF_NONRESIDENT_LE;
			attr->nres.run_off = attr->name_off;
			attr->nres.data_size = cpu_to_le64(nsize);
			attr->nres.valid_size = attr->nres.data_size;
			attr->nres.alloc_size =
				cpu_to_le64(ntfs_up_cluster(sbi, nsize));

			err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
						     clst, NULL, 0, &alen, 0,
						     NULL);
			if (err)
				goto out5;

			err = run_pack(&ni->file.run, 0, clst,
				       Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
				       &vcn);
			if (err < 0)
				goto out5;

			if (vcn != clst) {
				err = -EINVAL;
				goto out5;
			}

1527
			asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
1528 1529 1530 1531 1532 1533
		} else {
			attr->res.data_off = SIZEOF_RESIDENT_LE;
			attr->res.data_size = cpu_to_le32(nsize);
			memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
			nsize = 0;
		}
1534 1535
		/* Size of symlink equals the length of input string. */
		inode->i_size = size;
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552

		attr->size = cpu_to_le32(asize);

		err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
					  &new_de->ref);
		if (err)
			goto out5;

		rp_inserted = true;
	}

	attr = Add2Ptr(attr, asize);
	attr->type = ATTR_END;

	rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
	rec->next_attr_id = cpu_to_le16(aid);

1553
	/* Step 2: Add new name in index. */
1554
	err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
1555 1556 1557
	if (err)
		goto out6;

1558 1559 1560
	/* Unlock parent directory before ntfs_init_acl. */
	ni_unlock(dir_ni);

1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
	inode->i_generation = le16_to_cpu(rec->seq);

	dir->i_mtime = dir->i_ctime = inode->i_atime;

	if (S_ISDIR(mode)) {
		inode->i_op = &ntfs_dir_inode_operations;
		inode->i_fop = &ntfs_dir_operations;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &ntfs_link_inode_operations;
		inode->i_fop = NULL;
		inode->i_mapping->a_ops = &ntfs_aops;
1572 1573
		inode->i_size = size;
		inode_nohighmem(inode);
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
	} else if (S_ISREG(mode)) {
		inode->i_op = &ntfs_file_inode_operations;
		inode->i_fop = &ntfs_file_operations;
		inode->i_mapping->a_ops =
			is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
		init_rwsem(&ni->file.run_lock);
	} else {
		inode->i_op = &ntfs_special_inode_operations;
		init_special_inode(inode, mode, dev);
	}

#ifdef CONFIG_NTFS3_FS_POSIX_ACL
	if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
		err = ntfs_init_acl(mnt_userns, inode, dir);
		if (err)
1589
			goto out7;
1590 1591 1592 1593 1594 1595
	} else
#endif
	{
		inode->i_flags |= S_NOSEC;
	}

1596
	/* Write non resident data. */
1597
	if (nsize) {
1598
		err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
1599 1600 1601 1602
		if (err)
			goto out7;
	}

1603 1604 1605 1606
	/*
	 * Call 'd_instantiate' after inode->i_op is set
	 * but before finish_open.
	 */
1607 1608 1609 1610
	d_instantiate(dentry, inode);

	ntfs_save_wsl_perm(inode);
	mark_inode_dirty(dir);
1611
	mark_inode_dirty(inode);
1612

1613
	/* Normal exit. */
1614 1615 1616 1617
	goto out2;

out7:

1618
	/* Undo 'indx_insert_entry'. */
1619
	ni_lock_dir(dir_ni);
1620 1621
	indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
			  le16_to_cpu(new_de->key_size), sbi);
1622
	/* ni_unlock(dir_ni); will be called later. */
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
out6:
	if (rp_inserted)
		ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);

out5:
	if (S_ISDIR(mode) || run_is_empty(&ni->file.run))
		goto out4;

	run_deallocate(sbi, &ni->file.run, false);

out4:
	clear_rec_inuse(rec);
	clear_nlink(inode);
	ni->mi.dirty = false;
	discard_new_inode(inode);
out3:
	ntfs_mark_rec_free(sbi, ino);

out2:
	__putname(new_de);
1643
	kfree(rp);
1644 1645

out1:
1646 1647
	if (err) {
		ni_unlock(dir_ni);
1648
		return ERR_PTR(err);
1649
	}
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659

	unlock_new_inode(inode);

	return inode;
}

int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
{
	int err;
	struct ntfs_inode *ni = ntfs_i(inode);
1660 1661 1662
	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
	struct NTFS_DE *de;
	struct ATTR_FILE_NAME *de_name;
1663

1664
	/* Allocate PATH_MAX bytes. */
1665 1666
	de = __getname();
	if (!de)
1667 1668
		return -ENOMEM;

1669 1670
	/* Mark rw ntfs as dirty. It will be cleared at umount. */
	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
1671

1672 1673
	/* Construct 'de'. */
	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1674 1675 1676
	if (err)
		goto out;

1677 1678 1679 1680 1681 1682 1683 1684
	de_name = (struct ATTR_FILE_NAME *)(de + 1);
	/* Fill duplicate info. */
	de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time =
		de_name->dup.a_time = kernel2nt(&inode->i_ctime);
	de_name->dup.alloc_size = de_name->dup.data_size =
		cpu_to_le64(inode->i_size);
	de_name->dup.fa = ni->std_fa;
	de_name->dup.ea_size = de_name->dup.reparse = 0;
1685

1686
	err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
1687
out:
1688
	__putname(de);
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
	return err;
}

/*
 * ntfs_unlink_inode
 *
 * inode_operations::unlink
 * inode_operations::rmdir
 */
int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
{
	int err;
1701
	struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
1702 1703 1704
	struct inode *inode = d_inode(dentry);
	struct ntfs_inode *ni = ntfs_i(inode);
	struct ntfs_inode *dir_ni = ntfs_i(dir);
1705 1706
	struct NTFS_DE *de, *de2 = NULL;
	int undo_remove;
1707

1708
	if (ntfs_is_meta_file(sbi, ni->mi.rno))
1709 1710
		return -EINVAL;

1711 1712 1713 1714 1715
	/* Allocate PATH_MAX bytes. */
	de = __getname();
	if (!de)
		return -ENOMEM;

1716 1717
	ni_lock(ni);

1718
	if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
1719
		err = -ENOTEMPTY;
1720
		goto out;
1721 1722
	}

1723
	err = fill_name_de(sbi, de, &dentry->d_name, NULL);
1724
	if (err < 0)
1725
		goto out;
1726

1727 1728
	undo_remove = 0;
	err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
1729

1730
	if (!err) {
1731
		drop_nlink(inode);
1732 1733 1734 1735 1736 1737
		dir->i_mtime = dir->i_ctime = current_time(dir);
		mark_inode_dirty(dir);
		inode->i_ctime = dir->i_ctime;
		if (inode->i_nlink)
			mark_inode_dirty(inode);
	} else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) {
1738
		make_bad_inode(inode);
1739 1740 1741 1742 1743 1744 1745
		ntfs_inode_err(inode, "failed to undo unlink");
		ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
	} else {
		if (ni_is_dirty(dir))
			mark_inode_dirty(dir);
		if (ni_is_dirty(inode))
			mark_inode_dirty(inode);
1746 1747
	}

1748
out:
1749
	ni_unlock(ni);
1750
	__putname(de);
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	return err;
}

void ntfs_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);

	if (inode->i_nlink)
		_ni_write_inode(inode, inode_needs_sync(inode));

	invalidate_inode_buffers(inode);
	clear_inode(inode);

	ni_clear(ntfs_i(inode));
}

static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
				      int buflen)
{
1770
	int i, err = -EINVAL;
1771 1772 1773
	struct ntfs_inode *ni = ntfs_i(inode);
	struct super_block *sb = inode->i_sb;
	struct ntfs_sb_info *sbi = sb->s_fs_info;
1774 1775
	u64 size;
	u16 ulen = 0;
1776 1777
	void *to_free = NULL;
	struct REPARSE_DATA_BUFFER *rp;
1778
	const __le16 *uname;
1779 1780
	struct ATTRIB *attr;

1781
	/* Reparse data present. Try to parse it. */
1782 1783 1784 1785 1786 1787
	static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
	static_assert(sizeof(u32) == sizeof(rp->ReparseTag));

	*buffer = 0;

	attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
1788
	if (!attr)
1789 1790 1791
		goto out;

	if (!attr->non_res) {
1792 1793
		rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
		if (!rp)
1794
			goto out;
1795
		size = le32_to_cpu(attr->res.data_size);
1796
	} else {
1797 1798 1799 1800 1801 1802 1803 1804 1805
		size = le64_to_cpu(attr->nres.data_size);
		rp = NULL;
	}

	if (size > sbi->reparse.max_size || size <= sizeof(u32))
		goto out;

	if (!rp) {
		rp = kmalloc(size, GFP_NOFS);
1806 1807 1808 1809 1810
		if (!rp) {
			err = -ENOMEM;
			goto out;
		}
		to_free = rp;
1811 1812
		/* Read into temporal buffer. */
		err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
1813 1814 1815 1816
		if (err)
			goto out;
	}

1817
	/* Microsoft Tag. */
1818 1819
	switch (rp->ReparseTag) {
	case IO_REPARSE_TAG_MOUNT_POINT:
1820
		/* Mount points and junctions. */
1821
		/* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
1822 1823
		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
				     MountPointReparseBuffer.PathBuffer))
1824
			goto out;
1825 1826 1827 1828 1829 1830
		uname = Add2Ptr(rp,
				offsetof(struct REPARSE_DATA_BUFFER,
					 MountPointReparseBuffer.PathBuffer) +
					le16_to_cpu(rp->MountPointReparseBuffer
							    .PrintNameOffset));
		ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
1831 1832 1833 1834 1835
		break;

	case IO_REPARSE_TAG_SYMLINK:
		/* FolderSymbolicLink */
		/* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
1836 1837
		if (size <= offsetof(struct REPARSE_DATA_BUFFER,
				     SymbolicLinkReparseBuffer.PathBuffer))
1838
			goto out;
1839 1840 1841 1842 1843 1844
		uname = Add2Ptr(
			rp, offsetof(struct REPARSE_DATA_BUFFER,
				     SymbolicLinkReparseBuffer.PathBuffer) +
				    le16_to_cpu(rp->SymbolicLinkReparseBuffer
							.PrintNameOffset));
		ulen = le16_to_cpu(
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
			rp->SymbolicLinkReparseBuffer.PrintNameLength);
		break;

	case IO_REPARSE_TAG_CLOUD:
	case IO_REPARSE_TAG_CLOUD_1:
	case IO_REPARSE_TAG_CLOUD_2:
	case IO_REPARSE_TAG_CLOUD_3:
	case IO_REPARSE_TAG_CLOUD_4:
	case IO_REPARSE_TAG_CLOUD_5:
	case IO_REPARSE_TAG_CLOUD_6:
	case IO_REPARSE_TAG_CLOUD_7:
	case IO_REPARSE_TAG_CLOUD_8:
	case IO_REPARSE_TAG_CLOUD_9:
	case IO_REPARSE_TAG_CLOUD_A:
	case IO_REPARSE_TAG_CLOUD_B:
	case IO_REPARSE_TAG_CLOUD_C:
	case IO_REPARSE_TAG_CLOUD_D:
	case IO_REPARSE_TAG_CLOUD_E:
	case IO_REPARSE_TAG_CLOUD_F:
		err = sizeof("OneDrive") - 1;
		if (err > buflen)
			err = buflen;
		memcpy(buffer, "OneDrive", err);
		goto out;

	default:
		if (IsReparseTagMicrosoft(rp->ReparseTag)) {
1872
			/* Unknown Microsoft Tag. */
1873 1874 1875
			goto out;
		}
		if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
1876
		    size <= sizeof(struct REPARSE_POINT)) {
1877 1878 1879
			goto out;
		}

1880
		/* Users tag. */
1881 1882
		uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
		ulen = le16_to_cpu(rp->ReparseDataLength) -
1883 1884 1885
		       sizeof(struct REPARSE_POINT);
	}

1886
	/* Convert nlen from bytes to UNICODE chars. */
1887
	ulen >>= 1;
1888

1889
	/* Check that name is available. */
1890
	if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
1891 1892
		goto out;

1893
	/* If name is already zero terminated then truncate it now. */
1894 1895
	if (!uname[ulen - 1])
		ulen -= 1;
1896

1897
	err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
1898 1899 1900 1901

	if (err < 0)
		goto out;

1902
	/* Translate Windows '\' into Linux '/'. */
1903 1904 1905 1906 1907
	for (i = 0; i < err; i++) {
		if (buffer[i] == '\\')
			buffer[i] = '/';
	}

1908
	/* Always set last zero. */
1909 1910
	buffer[err] = 0;
out:
1911
	kfree(to_free);
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
	return err;
}

static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
				 struct delayed_call *done)
{
	int err;
	char *ret;

	if (!de)
		return ERR_PTR(-ECHILD);

	ret = kmalloc(PAGE_SIZE, GFP_NOFS);
	if (!ret)
		return ERR_PTR(-ENOMEM);

	err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
	if (err < 0) {
		kfree(ret);
		return ERR_PTR(err);
	}

	set_delayed_call(done, kfree_link, ret);

	return ret;
}

// clang-format off
const struct inode_operations ntfs_link_inode_operations = {
	.get_link	= ntfs_get_link,
	.setattr	= ntfs3_setattr,
	.listxattr	= ntfs_listxattr,
	.permission	= ntfs_permission,
	.get_acl	= ntfs_get_acl,
	.set_acl	= ntfs_set_acl,
};

const struct address_space_operations ntfs_aops = {
	.readpage	= ntfs_readpage,
	.readahead	= ntfs_readahead,
	.writepage	= ntfs_writepage,
	.writepages	= ntfs_writepages,
	.write_begin	= ntfs_write_begin,
	.write_end	= ntfs_write_end,
	.direct_IO	= ntfs_direct_IO,
	.bmap		= ntfs_bmap,
1958
	.dirty_folio	= block_dirty_folio,
1959
	.invalidate_folio = block_invalidate_folio,
1960 1961 1962 1963 1964 1965 1966
};

const struct address_space_operations ntfs_aops_cmpr = {
	.readpage	= ntfs_readpage,
	.readahead	= ntfs_readahead,
};
// clang-format on