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-rw-r--r--fs/ntfs3/inode.c1970
1 files changed, 1970 insertions, 0 deletions
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
new file mode 100644
index 000000000..dc937089a
--- /dev/null
+++ b/fs/ntfs3/inode.c
@@ -0,0 +1,1970 @@
+// 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"
+
+/*
+ * ntfs_read_mft - Read record and parses MFT.
+ */
+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' */
+ inode->i_uid = sbi->options->fs_uid;
+ inode->i_gid = sbi->options->fs_gid;
+
+ 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 = -ESTALE;
+ ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
+ goto out;
+ }
+
+ if (le32_to_cpu(rec->total) != sbi->record_size) {
+ /* Bad inode? */
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (!is_rec_base(rec)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Record should contain $I30 root. */
+ is_dir = rec->flags & RECORD_FLAG_DIR;
+
+ /* MFT_REC_MFT is not a dir */
+ if (is_dir && ino == MFT_REC_MFT) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ inode->i_generation = le16_to_cpu(rec->seq);
+
+ /* Enumerate all struct Attributes MFT. */
+ le = NULL;
+ attr = NULL;
+
+ /*
+ * To reduce tab pressure use goto instead of
+ * 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) {
+ /* This is non primary attribute segment. Ignore if not MFT. */
+ 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);
+
+ if (le16_to_cpu(attr->name_off) + attr->name_len > asize)
+ goto out;
+
+ if (attr->non_res) {
+ t64 = le64_to_cpu(attr->nres.alloc_size);
+ if (le64_to_cpu(attr->nres.data_size) > t64 ||
+ le64_to_cpu(attr->nres.valid_size) > t64)
+ goto out;
+ }
+
+ 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) {
+ /* Ignore data attribute in dir record. */
+ 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))))) {
+ /* File contains stream attribute. Ignore it. */
+ 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);
+ }
+
+ mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv);
+
+ 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);
+
+ 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;
+
+ is_root = true;
+ ni->ni_flags |= NI_FLAG_DIR;
+
+ err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
+ if (err)
+ goto out;
+
+ mode = sb->s_root
+ ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv))
+ : (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:
+ /*
+ * Normal symlink.
+ * Assume one unicode symbol == one utf8.
+ */
+ inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer
+ .PrintNameLength) /
+ sizeof(u16);
+
+ ni->i_valid = inode->i_size;
+
+ /* Clear directory bit. */
+ 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;
+ goto attr_unpack_run; // Double break.
+ }
+ 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);
+
+ if (roff > asize) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ 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) {
+ /* Reuse rec as buffer for ascii name. */
+ err = -ENOENT;
+ goto out;
+ }
+
+ if (std5->fa & FILE_ATTRIBUTE_READONLY)
+ mode &= ~0222;
+
+ if (!names) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ 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;
+ }
+
+ set_nlink(inode, names);
+
+ if (S_ISDIR(mode)) {
+ ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
+
+ /*
+ * Dot and dot-dot should be included in count but was not
+ * included in enumeration.
+ * Usually a hard links to directories are disabled.
+ */
+ 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;
+ inode_nohighmem(inode);
+ } 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)) {
+ /* Records in $Extend are not a files or general directories. */
+ inode->i_op = &ntfs_file_inode_operations;
+ } else {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if ((sbi->options->sys_immutable &&
+ (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)) {
+ /* If no xattr then no security (stored in xattr). */
+ inode->i_flags |= S_NOSEC;
+ }
+
+ 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);
+}
+
+/*
+ * ntfs_test_inode
+ *
+ * Return: 1 if match.
+ */
+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) {
+ /* Inode overlaps? */
+ _ntfs_bad_inode(inode);
+ }
+
+ if (IS_ERR(inode) && name)
+ ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
+
+ 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;
+
+ /* Clear previous state. */
+ clear_buffer_new(bh);
+ clear_buffer_uptodate(bh);
+
+ /* Direct write uses 'create=0'. */
+ if (!create && vbo >= ni->i_valid) {
+ /* Out of valid. */
+ return 0;
+ }
+
+ if (vbo >= inode->i_size) {
+ /* Out of size. */
+ 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) {
+ /* ntfs_direct_IO will update ni->i_valid. */
+ if (vbo >= valid)
+ set_buffer_new(bh);
+ } else if (create) {
+ /* Normal write. */
+ 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) {
+ /* Read out of valid data. */
+ /* Should never be here 'cause already checked. */
+ clear_buffer_mapped(bh);
+ } else if (vbo + bytes <= valid) {
+ /* Normal read. */
+ } else if (vbo + block_size <= valid) {
+ /* Normal short read. */
+ bytes = block_size;
+ } else {
+ /*
+ * Read across valid size: vbo < valid && valid < vbo + block_size
+ */
+ 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);
+ err = bh_read(bh, 0);
+ if (err < 0)
+ 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_read_folio(struct file *file, struct folio *folio)
+{
+ struct page *page = &folio->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;
+ }
+
+ /* Normal + sparse files. */
+ return mpage_read_folio(folio, 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)) {
+ /* No readahead for resident. */
+ return;
+ }
+
+ if (is_compressed(ni)) {
+ /* No readahead for compressed. */
+ return;
+ }
+
+ valid = ni->i_valid;
+ pos = readahead_pos(rac);
+
+ if (valid < i_size_read(inode) && pos <= valid &&
+ valid < pos + readahead_length(rac)) {
+ /* Range cross 'valid'. Read it page by page. */
+ 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;
+ size_t iter_count = iov_iter_count(iter);
+ loff_t valid;
+ ssize_t ret;
+
+ if (is_resident(ni)) {
+ /* Switch to buffered write. */
+ ret = 0;
+ goto out;
+ }
+
+ ret = blockdev_direct_IO(iocb, inode, iter,
+ wr ? ntfs_get_block_direct_IO_W
+ : ntfs_get_block_direct_IO_R);
+
+ if (ret > 0)
+ end = vbo + ret;
+ else if (wr && ret == -EIOCBQUEUED)
+ end = vbo + iter_count;
+ else
+ 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) {
+ /* Fix page. */
+ 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;
+
+ /* Check for maximum file size. */
+ 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)
+{
+ /* Redirect call to 'ntfs_writepage' for resident files. */
+ if (is_resident(ntfs_i(mapping->host)))
+ return generic_writepages(mapping, wbc);
+ return mpage_writepages(mapping, wbc, ntfs_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);
+}
+
+int ntfs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, u32 len, 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);
+
+ 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, pagep,
+ ntfs_get_block_write_begin);
+
+out:
+ return err;
+}
+
+/*
+ * ntfs_write_end - Address_space_operations::write_end.
+ */
+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;
+ /* Clear any buffers in page. */
+ 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) {
+ /* ni->i_valid is changed in ntfs_get_block_vbo. */
+ 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, &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);
+}
+
+/*
+ * 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.
+ */
+static int writeback_inode(struct inode *inode)
+{
+ int ret = sync_inode_metadata(inode, 0);
+
+ if (!ret)
+ ret = filemap_fdatawrite(inode->i_mapping);
+ return ret;
+}
+
+/*
+ * ntfs_flush_inodes
+ *
+ * Write data and metadata corresponding to i1 and i2. The io is
+ * started but we do not wait for any of it to finish.
+ *
+ * filemap_flush() is used for the block device, so if there is a dirty
+ * page for a block already in flight, we will not wait and start the
+ * io over again.
+ */
+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)
+ ret = sync_blockdev_nowait(sb->s_bdev);
+ return ret;
+}
+
+int inode_write_data(struct inode *inode, const void *data, size_t bytes)
+{
+ pgoff_t idx;
+
+ /* Write non resident data. */
+ 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;
+}
+
+/*
+ * ntfs_reparse_bytes
+ *
+ * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK)
+ * for unicode string of @uni_len length.
+ */
+static inline u32 ntfs_reparse_bytes(u32 uni_len)
+{
+ /* Header + unicode string + decorated unicode string. */
+ 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;
+
+ rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS);
+ if (!rp)
+ return ERR_PTR(-ENOMEM);
+
+ rs = &rp->SymbolicLinkReparseBuffer;
+ rp_name = rs->PathBuffer;
+
+ /* Convert link name to UTF-16. */
+ err = ntfs_nls_to_utf16(sbi, symname, size,
+ (struct cpu_str *)(rp_name - 1), 2 * size,
+ UTF16_LITTLE_ENDIAN);
+ if (err < 0)
+ goto out;
+
+ /* err = the length of unicode name of symlink. */
+ *nsize = ntfs_reparse_bytes(err);
+
+ if (*nsize > sbi->reparse.max_size) {
+ err = -EFBIG;
+ goto out;
+ }
+
+ /* Translate Linux '/' into Windows '\'. */
+ 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));
+
+ /* PrintName + SubstituteName. */
+ rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
+ rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
+ rs->PrintNameLength = rs->SubstituteNameOffset;
+
+ /*
+ * TODO: Use relative path if possible to allow Windows to
+ * parse this path.
+ * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE).
+ */
+ rs->Flags = 0;
+
+ memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
+
+ /* Decorate SubstituteName. */
+ 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:
+ kfree(rp);
+ 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;
+
+ ni_lock_dir(dir_ni);
+
+ dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
+ if (!dir_root) {
+ err = -EINVAL;
+ goto out1;
+ }
+
+ if (S_ISDIR(mode)) {
+ /* Use parent's directory attributes. */
+ fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY |
+ FILE_ATTRIBUTE_ARCHIVE;
+ /*
+ * By default child directory inherits parent attributes.
+ * Root directory is hidden + system.
+ * Make an exception for children in root.
+ */
+ 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;
+
+ /*
+ * Linux: there are dir/file/symlink and so on.
+ * NTFS: symlinks are "dir + reparse" or "file + reparse"
+ * It is good idea to create:
+ * dir + reparse if 'symname' points to directory
+ * or
+ * file + reparse if 'symname' points to file
+ * Unfortunately kern_path hangs if symname contains 'dir'.
+ */
+
+ /*
+ * 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)) {
+ if (sbi->options->sparse) {
+ /* Sparsed regular file, cause option 'sparse'. */
+ fa = FILE_ATTRIBUTE_SPARSE_FILE |
+ FILE_ATTRIBUTE_ARCHIVE;
+ } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) {
+ /* Compressed regular file, if parent is compressed. */
+ fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE;
+ } else {
+ /* Regular file, default attributes. */
+ fa = FILE_ATTRIBUTE_ARCHIVE;
+ }
+ } else {
+ fa = FILE_ATTRIBUTE_ARCHIVE;
+ }
+
+ if (!(mode & 0222))
+ fa |= FILE_ATTRIBUTE_READONLY;
+
+ /* Allocate PATH_MAX bytes. */
+ new_de = __getname();
+ if (!new_de) {
+ err = -ENOMEM;
+ goto out1;
+ }
+
+ /* Mark rw ntfs as dirty. it will be cleared at umount. */
+ ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
+
+ /* Step 1: allocate and fill new mft record. */
+ 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);
+ mode = inode->i_mode;
+
+ 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));
+
+ /* Get default security id. */
+ 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;
+ }
+ }
+
+ /* Insert standard info. */
+ 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);
+
+ /* Insert file name. */
+ 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);
+ asize = ALIGN(SIZEOF_RESIDENT + dsize, 8);
+
+ 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) {
+ /* Insert security attribute. */
+ asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8);
+
+ 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);
+ }
+
+ attr->id = cpu_to_le16(aid++);
+ if (fa & FILE_ATTRIBUTE_DIRECTORY) {
+ /*
+ * Regular directory or symlink to directory.
+ * Create root attribute.
+ */
+ 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)) {
+ /*
+ * Symlink to file.
+ * Create empty resident data attribute.
+ */
+ asize = SIZEOF_RESIDENT;
+
+ /* Insert empty ATTR_DATA */
+ attr->type = ATTR_DATA;
+ attr->size = cpu_to_le32(SIZEOF_RESIDENT);
+ attr->name_off = SIZEOF_RESIDENT_LE;
+ attr->res.data_off = SIZEOF_RESIDENT_LE;
+ } else if (S_ISREG(mode)) {
+ /*
+ * Regular file. Create empty non resident data attribute.
+ */
+ attr->type = ATTR_DATA;
+ 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;
+ } else {
+ attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
+ attr->name_off = SIZEOF_NONRESIDENT_LE;
+ asize = SIZEOF_NONRESIDENT + 8;
+ }
+ 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;
+ }
+
+ 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;
+ }
+
+ /*
+ * Insert ATTR_REPARSE.
+ */
+ attr = Add2Ptr(attr, asize);
+ attr->type = ATTR_REPARSE;
+ attr->id = cpu_to_le16(aid++);
+
+ /* Resident or non resident? */
+ asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);
+ t16 = PtrOffset(rec, attr);
+
+ /*
+ * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.
+ * It is good idea to keep extened attributes resident.
+ */
+ if (asize + t16 + 0x78 + 8 > sbi->record_size) {
+ CLST alen;
+ CLST clst = bytes_to_cluster(sbi, nsize);
+
+ /* Bytes per runs. */
+ 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;
+ }
+
+ asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);
+ } 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;
+ }
+ /* Size of symlink equals the length of input string. */
+ inode->i_size = size;
+
+ 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);
+
+ /* Step 2: Add new name in index. */
+ err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0);
+ if (err)
+ goto out6;
+
+ /* Unlock parent directory before ntfs_init_acl. */
+ ni_unlock(dir_ni);
+
+ 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;
+ inode->i_size = size;
+ inode_nohighmem(inode);
+ } 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)
+ goto out7;
+ } else
+#endif
+ {
+ inode->i_flags |= S_NOSEC;
+ }
+
+ /* Write non resident data. */
+ if (nsize) {
+ err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0);
+ if (err)
+ goto out7;
+ }
+
+ /*
+ * Call 'd_instantiate' after inode->i_op is set
+ * but before finish_open.
+ */
+ d_instantiate(dentry, inode);
+
+ ntfs_save_wsl_perm(inode);
+ mark_inode_dirty(dir);
+ mark_inode_dirty(inode);
+
+ /* Normal exit. */
+ goto out2;
+
+out7:
+
+ /* Undo 'indx_insert_entry'. */
+ ni_lock_dir(dir_ni);
+ indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
+ le16_to_cpu(new_de->key_size), sbi);
+ /* ni_unlock(dir_ni); will be called later. */
+out6:
+ if (rp_inserted)
+ ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
+
+out5:
+ if (!S_ISDIR(mode))
+ 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, false);
+
+out2:
+ __putname(new_de);
+ kfree(rp);
+
+out1:
+ if (err) {
+ ni_unlock(dir_ni);
+ return ERR_PTR(err);
+ }
+
+ 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);
+ struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
+ struct NTFS_DE *de;
+
+ /* Allocate PATH_MAX bytes. */
+ de = __getname();
+ if (!de)
+ return -ENOMEM;
+
+ /* Mark rw ntfs as dirty. It will be cleared at umount. */
+ ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
+
+ /* Construct 'de'. */
+ err = fill_name_de(sbi, de, &dentry->d_name, NULL);
+ if (err)
+ goto out;
+
+ err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de);
+out:
+ __putname(de);
+ return err;
+}
+
+/*
+ * ntfs_unlink_inode
+ *
+ * inode_operations::unlink
+ * inode_operations::rmdir
+ */
+int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
+{
+ int err;
+ struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info;
+ struct inode *inode = d_inode(dentry);
+ struct ntfs_inode *ni = ntfs_i(inode);
+ struct ntfs_inode *dir_ni = ntfs_i(dir);
+ struct NTFS_DE *de, *de2 = NULL;
+ int undo_remove;
+
+ if (ntfs_is_meta_file(sbi, ni->mi.rno))
+ return -EINVAL;
+
+ /* Allocate PATH_MAX bytes. */
+ de = __getname();
+ if (!de)
+ return -ENOMEM;
+
+ ni_lock(ni);
+
+ if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) {
+ err = -ENOTEMPTY;
+ goto out;
+ }
+
+ err = fill_name_de(sbi, de, &dentry->d_name, NULL);
+ if (err < 0)
+ goto out;
+
+ undo_remove = 0;
+ err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove);
+
+ if (!err) {
+ drop_nlink(inode);
+ 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)) {
+ _ntfs_bad_inode(inode);
+ } else {
+ if (ni_is_dirty(dir))
+ mark_inode_dirty(dir);
+ if (ni_is_dirty(inode))
+ mark_inode_dirty(inode);
+ }
+
+out:
+ ni_unlock(ni);
+ __putname(de);
+ 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)
+{
+ int i, err = -EINVAL;
+ struct ntfs_inode *ni = ntfs_i(inode);
+ struct super_block *sb = inode->i_sb;
+ struct ntfs_sb_info *sbi = sb->s_fs_info;
+ u64 size;
+ u16 ulen = 0;
+ void *to_free = NULL;
+ struct REPARSE_DATA_BUFFER *rp;
+ const __le16 *uname;
+ struct ATTRIB *attr;
+
+ /* Reparse data present. Try to parse it. */
+ 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);
+ if (!attr)
+ goto out;
+
+ if (!attr->non_res) {
+ rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER));
+ if (!rp)
+ goto out;
+ size = le32_to_cpu(attr->res.data_size);
+ } else {
+ 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);
+ if (!rp) {
+ err = -ENOMEM;
+ goto out;
+ }
+ to_free = rp;
+ /* Read into temporal buffer. */
+ err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL);
+ if (err)
+ goto out;
+ }
+
+ /* Microsoft Tag. */
+ switch (rp->ReparseTag) {
+ case IO_REPARSE_TAG_MOUNT_POINT:
+ /* Mount points and junctions. */
+ /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
+ if (size <= offsetof(struct REPARSE_DATA_BUFFER,
+ MountPointReparseBuffer.PathBuffer))
+ goto out;
+ uname = Add2Ptr(rp,
+ offsetof(struct REPARSE_DATA_BUFFER,
+ MountPointReparseBuffer.PathBuffer) +
+ le16_to_cpu(rp->MountPointReparseBuffer
+ .PrintNameOffset));
+ ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
+ break;
+
+ case IO_REPARSE_TAG_SYMLINK:
+ /* FolderSymbolicLink */
+ /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
+ if (size <= offsetof(struct REPARSE_DATA_BUFFER,
+ SymbolicLinkReparseBuffer.PathBuffer))
+ goto out;
+ uname = Add2Ptr(
+ rp, offsetof(struct REPARSE_DATA_BUFFER,
+ SymbolicLinkReparseBuffer.PathBuffer) +
+ le16_to_cpu(rp->SymbolicLinkReparseBuffer
+ .PrintNameOffset));
+ ulen = le16_to_cpu(
+ 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)) {
+ /* Unknown Microsoft Tag. */
+ goto out;
+ }
+ if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
+ size <= sizeof(struct REPARSE_POINT)) {
+ goto out;
+ }
+
+ /* Users tag. */
+ uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT));
+ ulen = le16_to_cpu(rp->ReparseDataLength) -
+ sizeof(struct REPARSE_POINT);
+ }
+
+ /* Convert nlen from bytes to UNICODE chars. */
+ ulen >>= 1;
+
+ /* Check that name is available. */
+ if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size))
+ goto out;
+
+ /* If name is already zero terminated then truncate it now. */
+ if (!uname[ulen - 1])
+ ulen -= 1;
+
+ err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen);
+
+ if (err < 0)
+ goto out;
+
+ /* Translate Windows '\' into Linux '/'. */
+ for (i = 0; i < err; i++) {
+ if (buffer[i] == '\\')
+ buffer[i] = '/';
+ }
+
+ /* Always set last zero. */
+ buffer[err] = 0;
+out:
+ kfree(to_free);
+ 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,
+};
+
+const struct address_space_operations ntfs_aops = {
+ .read_folio = ntfs_read_folio,
+ .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,
+ .dirty_folio = block_dirty_folio,
+ .invalidate_folio = block_invalidate_folio,
+};
+
+const struct address_space_operations ntfs_aops_cmpr = {
+ .read_folio = ntfs_read_folio,
+ .readahead = ntfs_readahead,
+};
+// clang-format on