Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1017 insertions, 0 deletions

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
new file mode 100644
index 000000000..ae55ab885
--- /dev/null
+++ b/fs/udf/namei.c
@@ -0,0 +1,1017 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * namei.c
+ *
+ * PURPOSE
+ *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ *  (C) 1998-2004 Ben Fennema
+ *  (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ *  12/12/98 blf  Created. Split out the lookup code from dir.c
+ *  04/19/99 blf  link, mknod, symlink support
+ */
+
+#include "udfdecl.h"
+
+#include "udf_i.h"
+#include "udf_sb.h"
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/crc-itu-t.h>
+#include <linux/exportfs.h>
+#include <linux/iversion.h>
+
+static inline int udf_match(int len1, const unsigned char *name1, int len2,
+			    const unsigned char *name2)
+{
+	if (len1 != len2)
+		return 0;
+
+	return !memcmp(name1, name2, len1);
+}
+
+/**
+ * udf_fiiter_find_entry - find entry in given directory.
+ *
+ * @dir:	directory inode to search in
+ * @child:	qstr of the name
+ * @iter:	iter to use for searching
+ *
+ * This function searches in the directory @dir for a file name @child. When
+ * found, @iter points to the position in the directory with given entry.
+ *
+ * Returns 0 on success, < 0 on error (including -ENOENT).
+ */
+static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
+				 struct udf_fileident_iter *iter)
+{
+	int flen;
+	unsigned char *fname = NULL;
+	struct super_block *sb = dir->i_sb;
+	int isdotdot = child->len == 2 &&
+		child->name[0] == '.' && child->name[1] == '.';
+	int ret;
+
+	fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+	if (!fname)
+		return -ENOMEM;
+
+	for (ret = udf_fiiter_init(iter, dir, 0);
+	     !ret && iter->pos < dir->i_size;
+	     ret = udf_fiiter_advance(iter)) {
+		if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+				continue;
+		}
+
+		if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+				continue;
+		}
+
+		if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
+		    isdotdot)
+			goto out_ok;
+
+		if (!iter->fi.lengthFileIdent)
+			continue;
+
+		flen = udf_get_filename(sb, iter->name,
+				iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
+		if (flen < 0) {
+			ret = flen;
+			goto out_err;
+		}
+
+		if (udf_match(flen, fname, child->len, child->name))
+			goto out_ok;
+	}
+	if (!ret)
+		ret = -ENOENT;
+
+out_err:
+	udf_fiiter_release(iter);
+out_ok:
+	kfree(fname);
+
+	return ret;
+}
+
+static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
+				 unsigned int flags)
+{
+	struct inode *inode = NULL;
+	struct udf_fileident_iter iter;
+	int err;
+
+	if (dentry->d_name.len > UDF_NAME_LEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
+	if (err < 0 && err != -ENOENT)
+		return ERR_PTR(err);
+
+	if (err == 0) {
+		struct kernel_lb_addr loc;
+
+		loc = lelb_to_cpu(iter.fi.icb.extLocation);
+		udf_fiiter_release(&iter);
+
+		inode = udf_iget(dir->i_sb, &loc);
+		if (IS_ERR(inode))
+			return ERR_CAST(inode);
+	}
+
+	return d_splice_alias(inode, dentry);
+}
+
+static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
+{
+	udf_pblk_t newblock;
+	struct buffer_head *dbh = NULL;
+	struct kernel_lb_addr eloc;
+	struct extent_position epos;
+	uint8_t alloctype;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	struct udf_fileident_iter iter;
+	uint8_t *impuse;
+	int ret;
+
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+		alloctype = ICBTAG_FLAG_AD_SHORT;
+	else
+		alloctype = ICBTAG_FLAG_AD_LONG;
+
+	if (!inode->i_size) {
+		iinfo->i_alloc_type = alloctype;
+		mark_inode_dirty(inode);
+		return 0;
+	}
+
+	/* alloc block, and copy data to it */
+	*block = udf_new_block(inode->i_sb, inode,
+			       iinfo->i_location.partitionReferenceNum,
+			       iinfo->i_location.logicalBlockNum, &ret);
+	if (!(*block))
+		return ret;
+	newblock = udf_get_pblock(inode->i_sb, *block,
+				  iinfo->i_location.partitionReferenceNum,
+				0);
+	if (newblock == 0xffffffff)
+		return -EFSCORRUPTED;
+	dbh = sb_getblk(inode->i_sb, newblock);
+	if (!dbh)
+		return -ENOMEM;
+	lock_buffer(dbh);
+	memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
+	memset(dbh->b_data + inode->i_size, 0,
+	       inode->i_sb->s_blocksize - inode->i_size);
+	set_buffer_uptodate(dbh);
+	unlock_buffer(dbh);
+
+	/* Drop inline data, add block instead */
+	iinfo->i_alloc_type = alloctype;
+	memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
+	iinfo->i_lenAlloc = 0;
+	eloc.logicalBlockNum = *block;
+	eloc.partitionReferenceNum =
+				iinfo->i_location.partitionReferenceNum;
+	iinfo->i_lenExtents = inode->i_size;
+	epos.bh = NULL;
+	epos.block = iinfo->i_location;
+	epos.offset = udf_file_entry_alloc_offset(inode);
+	ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
+	brelse(epos.bh);
+	if (ret < 0) {
+		brelse(dbh);
+		udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
+		return ret;
+	}
+	mark_inode_dirty(inode);
+
+	/* Now fixup tags in moved directory entries */
+	for (ret = udf_fiiter_init(&iter, inode, 0);
+	     !ret && iter.pos < inode->i_size;
+	     ret = udf_fiiter_advance(&iter)) {
+		iter.fi.descTag.tagLocation = cpu_to_le32(*block);
+		if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
+			impuse = dbh->b_data + iter.pos +
+						sizeof(struct fileIdentDesc);
+		else
+			impuse = NULL;
+		udf_fiiter_write_fi(&iter, impuse);
+	}
+	brelse(dbh);
+	/*
+	 * We don't expect the iteration to fail as the directory has been
+	 * already verified to be correct
+	 */
+	WARN_ON_ONCE(ret);
+	udf_fiiter_release(&iter);
+
+	return 0;
+}
+
+static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
+				struct udf_fileident_iter *iter)
+{
+	struct udf_inode_info *dinfo = UDF_I(dir);
+	int nfidlen, namelen = 0;
+	int ret;
+	int off, blksize = 1 << dir->i_blkbits;
+	udf_pblk_t block;
+	char name[UDF_NAME_LEN_CS0];
+
+	if (dentry) {
+		if (!dentry->d_name.len)
+			return -EINVAL;
+		namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
+					   dentry->d_name.len,
+					   name, UDF_NAME_LEN_CS0);
+		if (!namelen)
+			return -ENAMETOOLONG;
+	}
+	nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
+
+	for (ret = udf_fiiter_init(iter, dir, 0);
+	     !ret && iter->pos < dir->i_size;
+	     ret = udf_fiiter_advance(iter)) {
+		if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+			if (udf_dir_entry_len(&iter->fi) == nfidlen) {
+				iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
+				iter->fi.fileVersionNum = cpu_to_le16(1);
+				iter->fi.fileCharacteristics = 0;
+				iter->fi.lengthFileIdent = namelen;
+				iter->fi.lengthOfImpUse = cpu_to_le16(0);
+				memcpy(iter->namebuf, name, namelen);
+				iter->name = iter->namebuf;
+				return 0;
+			}
+		}
+	}
+	if (ret) {
+		udf_fiiter_release(iter);
+		return ret;
+	}
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
+	    blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
+		udf_fiiter_release(iter);
+		ret = udf_expand_dir_adinicb(dir, &block);
+		if (ret)
+			return ret;
+		ret = udf_fiiter_init(iter, dir, dir->i_size);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Get blocknumber to use for entry tag */
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		block = dinfo->i_location.logicalBlockNum;
+	} else {
+		block = iter->eloc.logicalBlockNum +
+				((iter->elen - 1) >> dir->i_blkbits);
+	}
+	off = iter->pos & (blksize - 1);
+	if (!off)
+		off = blksize;
+	/* Entry fits into current block? */
+	if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
+		goto store_fi;
+
+	ret = udf_fiiter_append_blk(iter);
+	if (ret) {
+		udf_fiiter_release(iter);
+		return ret;
+	}
+
+	/* Entry will be completely in the new block? Update tag location... */
+	if (!(iter->pos & (blksize - 1)))
+		block = iter->eloc.logicalBlockNum +
+				((iter->elen - 1) >> dir->i_blkbits);
+store_fi:
+	memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
+	if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
+		udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
+			    sizeof(struct tag));
+	else
+		udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
+			    sizeof(struct tag));
+	iter->fi.fileVersionNum = cpu_to_le16(1);
+	iter->fi.lengthFileIdent = namelen;
+	iter->fi.lengthOfImpUse = cpu_to_le16(0);
+	memcpy(iter->namebuf, name, namelen);
+	iter->name = iter->namebuf;
+
+	dir->i_size += nfidlen;
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		dinfo->i_lenAlloc += nfidlen;
+	} else {
+		/* Truncate last extent to proper size */
+		udf_fiiter_update_elen(iter, iter->elen -
+					(dinfo->i_lenExtents - dir->i_size));
+	}
+	mark_inode_dirty(dir);
+
+	return 0;
+}
+
+static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
+{
+	iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
+
+	if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
+		memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
+
+	udf_fiiter_write_fi(iter, NULL);
+}
+
+static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
+{
+	struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
+
+	if (!lvidiu)
+		return;
+	mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
+	if (dir)
+		le32_add_cpu(&lvidiu->numDirs, val);
+	else
+		le32_add_cpu(&lvidiu->numFiles, val);
+	udf_updated_lvid(sb);
+	mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
+}
+
+static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	struct inode *dir = d_inode(dentry->d_parent);
+	struct udf_fileident_iter iter;
+	int err;
+
+	err = udf_fiiter_add_entry(dir, dentry, &iter);
+	if (err) {
+		inode_dec_link_count(inode);
+		discard_new_inode(inode);
+		return err;
+	}
+	iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+		cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+	udf_fiiter_write_fi(&iter, NULL);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	udf_fiiter_release(&iter);
+	udf_add_fid_counter(dir->i_sb, false, 1);
+	d_instantiate_new(dentry, inode);
+
+	return 0;
+}
+
+static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
+{
+	struct inode *inode = udf_new_inode(dir, mode);
+
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	inode->i_data.a_ops = &udf_aops;
+	inode->i_op = &udf_file_inode_operations;
+	inode->i_fop = &udf_file_operations;
+	mark_inode_dirty(inode);
+
+	return udf_add_nondir(dentry, inode);
+}
+
+static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
+		       struct file *file, umode_t mode)
+{
+	struct inode *inode = udf_new_inode(dir, mode);
+
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	inode->i_data.a_ops = &udf_aops;
+	inode->i_op = &udf_file_inode_operations;
+	inode->i_fop = &udf_file_operations;
+	mark_inode_dirty(inode);
+	d_tmpfile(file, inode);
+	unlock_new_inode(inode);
+	return finish_open_simple(file, 0);
+}
+
+static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
+{
+	struct inode *inode;
+
+	if (!old_valid_dev(rdev))
+		return -EINVAL;
+
+	inode = udf_new_inode(dir, mode);
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	init_special_inode(inode, mode, rdev);
+	return udf_add_nondir(dentry, inode);
+}
+
+static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+		     struct dentry *dentry, umode_t mode)
+{
+	struct inode *inode;
+	struct udf_fileident_iter iter;
+	int err;
+	struct udf_inode_info *dinfo = UDF_I(dir);
+	struct udf_inode_info *iinfo;
+
+	inode = udf_new_inode(dir, S_IFDIR | mode);
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	iinfo = UDF_I(inode);
+	inode->i_op = &udf_dir_inode_operations;
+	inode->i_fop = &udf_dir_operations;
+	err = udf_fiiter_add_entry(inode, NULL, &iter);
+	if (err) {
+		clear_nlink(inode);
+		discard_new_inode(inode);
+		return err;
+	}
+	set_nlink(inode, 2);
+	iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+		cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
+	iter.fi.fileCharacteristics =
+			FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
+	udf_fiiter_write_fi(&iter, NULL);
+	udf_fiiter_release(&iter);
+	mark_inode_dirty(inode);
+
+	err = udf_fiiter_add_entry(dir, dentry, &iter);
+	if (err) {
+		clear_nlink(inode);
+		discard_new_inode(inode);
+		return err;
+	}
+	iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+		cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+	iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
+	udf_fiiter_write_fi(&iter, NULL);
+	udf_fiiter_release(&iter);
+	udf_add_fid_counter(dir->i_sb, true, 1);
+	inc_nlink(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	d_instantiate_new(dentry, inode);
+
+	return 0;
+}
+
+static int empty_dir(struct inode *dir)
+{
+	struct udf_fileident_iter iter;
+	int ret;
+
+	for (ret = udf_fiiter_init(&iter, dir, 0);
+	     !ret && iter.pos < dir->i_size;
+	     ret = udf_fiiter_advance(&iter)) {
+		if (iter.fi.lengthFileIdent &&
+		    !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) {
+			udf_fiiter_release(&iter);
+			return 0;
+		}
+	}
+	udf_fiiter_release(&iter);
+
+	return 1;
+}
+
+static int udf_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int ret;
+	struct inode *inode = d_inode(dentry);
+	struct udf_fileident_iter iter;
+	struct kernel_lb_addr tloc;
+
+	ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
+	if (ret)
+		goto out;
+
+	ret = -EFSCORRUPTED;
+	tloc = lelb_to_cpu(iter.fi.icb.extLocation);
+	if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
+		goto end_rmdir;
+	ret = -ENOTEMPTY;
+	if (!empty_dir(inode))
+		goto end_rmdir;
+	udf_fiiter_delete_entry(&iter);
+	if (inode->i_nlink != 2)
+		udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
+			 inode->i_nlink);
+	clear_nlink(inode);
+	inode->i_size = 0;
+	inode_dec_link_count(dir);
+	udf_add_fid_counter(dir->i_sb, true, -1);
+	dir->i_mtime = inode_set_ctime_to_ts(dir,
+					     inode_set_ctime_current(inode));
+	mark_inode_dirty(dir);
+	ret = 0;
+end_rmdir:
+	udf_fiiter_release(&iter);
+out:
+	return ret;
+}
+
+static int udf_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int ret;
+	struct inode *inode = d_inode(dentry);
+	struct udf_fileident_iter iter;
+	struct kernel_lb_addr tloc;
+
+	ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
+	if (ret)
+		goto out;
+
+	ret = -EFSCORRUPTED;
+	tloc = lelb_to_cpu(iter.fi.icb.extLocation);
+	if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
+		goto end_unlink;
+
+	if (!inode->i_nlink) {
+		udf_debug("Deleting nonexistent file (%lu), %u\n",
+			  inode->i_ino, inode->i_nlink);
+		set_nlink(inode, 1);
+	}
+	udf_fiiter_delete_entry(&iter);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	inode_dec_link_count(inode);
+	udf_add_fid_counter(dir->i_sb, false, -1);
+	inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
+	ret = 0;
+end_unlink:
+	udf_fiiter_release(&iter);
+out:
+	return ret;
+}
+
+static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
+		       struct dentry *dentry, const char *symname)
+{
+	struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
+	struct pathComponent *pc;
+	const char *compstart;
+	struct extent_position epos = {};
+	int eoffset, elen = 0;
+	uint8_t *ea;
+	int err;
+	udf_pblk_t block;
+	unsigned char *name = NULL;
+	int namelen;
+	struct udf_inode_info *iinfo;
+	struct super_block *sb = dir->i_sb;
+
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	iinfo = UDF_I(inode);
+	down_write(&iinfo->i_data_sem);
+	name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
+	if (!name) {
+		err = -ENOMEM;
+		goto out_no_entry;
+	}
+
+	inode->i_data.a_ops = &udf_symlink_aops;
+	inode->i_op = &udf_symlink_inode_operations;
+	inode_nohighmem(inode);
+
+	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		struct kernel_lb_addr eloc;
+		uint32_t bsize;
+
+		block = udf_new_block(sb, inode,
+				iinfo->i_location.partitionReferenceNum,
+				iinfo->i_location.logicalBlockNum, &err);
+		if (!block)
+			goto out_no_entry;
+		epos.block = iinfo->i_location;
+		epos.offset = udf_file_entry_alloc_offset(inode);
+		epos.bh = NULL;
+		eloc.logicalBlockNum = block;
+		eloc.partitionReferenceNum =
+				iinfo->i_location.partitionReferenceNum;
+		bsize = sb->s_blocksize;
+		iinfo->i_lenExtents = bsize;
+		err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
+		brelse(epos.bh);
+		if (err < 0) {
+			udf_free_blocks(sb, inode, &eloc, 0, 1);
+			goto out_no_entry;
+		}
+
+		block = udf_get_pblock(sb, block,
+				iinfo->i_location.partitionReferenceNum,
+				0);
+		epos.bh = sb_getblk(sb, block);
+		if (unlikely(!epos.bh)) {
+			err = -ENOMEM;
+			udf_free_blocks(sb, inode, &eloc, 0, 1);
+			goto out_no_entry;
+		}
+		lock_buffer(epos.bh);
+		memset(epos.bh->b_data, 0x00, bsize);
+		set_buffer_uptodate(epos.bh);
+		unlock_buffer(epos.bh);
+		mark_buffer_dirty_inode(epos.bh, inode);
+		ea = epos.bh->b_data + udf_ext0_offset(inode);
+	} else
+		ea = iinfo->i_data + iinfo->i_lenEAttr;
+
+	eoffset = sb->s_blocksize - udf_ext0_offset(inode);
+	pc = (struct pathComponent *)ea;
+
+	if (*symname == '/') {
+		do {
+			symname++;
+		} while (*symname == '/');
+
+		pc->componentType = 1;
+		pc->lengthComponentIdent = 0;
+		pc->componentFileVersionNum = 0;
+		elen += sizeof(struct pathComponent);
+	}
+
+	err = -ENAMETOOLONG;
+
+	while (*symname) {
+		if (elen + sizeof(struct pathComponent) > eoffset)
+			goto out_no_entry;
+
+		pc = (struct pathComponent *)(ea + elen);
+
+		compstart = symname;
+
+		do {
+			symname++;
+		} while (*symname && *symname != '/');
+
+		pc->componentType = 5;
+		pc->lengthComponentIdent = 0;
+		pc->componentFileVersionNum = 0;
+		if (compstart[0] == '.') {
+			if ((symname - compstart) == 1)
+				pc->componentType = 4;
+			else if ((symname - compstart) == 2 &&
+					compstart[1] == '.')
+				pc->componentType = 3;
+		}
+
+		if (pc->componentType == 5) {
+			namelen = udf_put_filename(sb, compstart,
+						   symname - compstart,
+						   name, UDF_NAME_LEN_CS0);
+			if (!namelen)
+				goto out_no_entry;
+
+			if (elen + sizeof(struct pathComponent) + namelen >
+					eoffset)
+				goto out_no_entry;
+			else
+				pc->lengthComponentIdent = namelen;
+
+			memcpy(pc->componentIdent, name, namelen);
+		}
+
+		elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
+
+		if (*symname) {
+			do {
+				symname++;
+			} while (*symname == '/');
+		}
+	}
+
+	brelse(epos.bh);
+	inode->i_size = elen;
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		iinfo->i_lenAlloc = inode->i_size;
+	else
+		udf_truncate_tail_extent(inode);
+	mark_inode_dirty(inode);
+	up_write(&iinfo->i_data_sem);
+
+	err = udf_add_nondir(dentry, inode);
+out:
+	kfree(name);
+	return err;
+
+out_no_entry:
+	up_write(&iinfo->i_data_sem);
+	inode_dec_link_count(inode);
+	discard_new_inode(inode);
+	goto out;
+}
+
+static int udf_link(struct dentry *old_dentry, struct inode *dir,
+		    struct dentry *dentry)
+{
+	struct inode *inode = d_inode(old_dentry);
+	struct udf_fileident_iter iter;
+	int err;
+
+	err = udf_fiiter_add_entry(dir, dentry, &iter);
+	if (err)
+		return err;
+	iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
+	if (UDF_SB(inode->i_sb)->s_lvid_bh) {
+		*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
+			cpu_to_le32(lvid_get_unique_id(inode->i_sb));
+	}
+	udf_fiiter_write_fi(&iter, NULL);
+	udf_fiiter_release(&iter);
+
+	inc_nlink(inode);
+	udf_add_fid_counter(dir->i_sb, false, 1);
+	inode_set_ctime_current(inode);
+	mark_inode_dirty(inode);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	mark_inode_dirty(dir);
+	ihold(inode);
+	d_instantiate(dentry, inode);
+
+	return 0;
+}
+
+/* Anybody can rename anything with this: the permission checks are left to the
+ * higher-level routines.
+ */
+static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
+{
+	struct inode *old_inode = d_inode(old_dentry);
+	struct inode *new_inode = d_inode(new_dentry);
+	struct udf_fileident_iter oiter, niter, diriter;
+	bool has_diriter = false;
+	int retval;
+	struct kernel_lb_addr tloc;
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
+	if (retval)
+		return retval;
+
+	tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
+	if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
+		retval = -ENOENT;
+		goto out_oiter;
+	}
+
+	if (S_ISDIR(old_inode->i_mode)) {
+		if (new_inode) {
+			retval = -ENOTEMPTY;
+			if (!empty_dir(new_inode))
+				goto out_oiter;
+		}
+		retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
+					       &diriter);
+		if (retval == -ENOENT) {
+			udf_err(old_inode->i_sb,
+				"directory (ino %lu) has no '..' entry\n",
+				old_inode->i_ino);
+			retval = -EFSCORRUPTED;
+		}
+		if (retval)
+			goto out_oiter;
+		has_diriter = true;
+		tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
+		if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
+				old_dir->i_ino) {
+			retval = -EFSCORRUPTED;
+			udf_err(old_inode->i_sb,
+				"directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
+				old_inode->i_ino, old_dir->i_ino,
+				udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
+			goto out_oiter;
+		}
+	}
+
+	retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
+	if (retval && retval != -ENOENT)
+		goto out_oiter;
+	/* Entry found but not passed by VFS? */
+	if (!retval && !new_inode) {
+		retval = -EFSCORRUPTED;
+		udf_fiiter_release(&niter);
+		goto out_oiter;
+	}
+	/* Entry not found? Need to add one... */
+	if (retval) {
+		udf_fiiter_release(&niter);
+		retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
+		if (retval)
+			goto out_oiter;
+	}
+
+	/*
+	 * Like most other Unix systems, set the ctime for inodes on a
+	 * rename.
+	 */
+	inode_set_ctime_current(old_inode);
+	mark_inode_dirty(old_inode);
+
+	/*
+	 * ok, that's it
+	 */
+	niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
+	niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
+	memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
+	udf_fiiter_write_fi(&niter, NULL);
+	udf_fiiter_release(&niter);
+
+	/*
+	 * The old entry may have moved due to new entry allocation. Find it
+	 * again.
+	 */
+	udf_fiiter_release(&oiter);
+	retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
+	if (retval) {
+		udf_err(old_dir->i_sb,
+			"failed to find renamed entry again in directory (ino %lu)\n",
+			old_dir->i_ino);
+	} else {
+		udf_fiiter_delete_entry(&oiter);
+		udf_fiiter_release(&oiter);
+	}
+
+	if (new_inode) {
+		inode_set_ctime_current(new_inode);
+		inode_dec_link_count(new_inode);
+		udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
+				    -1);
+	}
+	old_dir->i_mtime = inode_set_ctime_current(old_dir);
+	new_dir->i_mtime = inode_set_ctime_current(new_dir);
+	mark_inode_dirty(old_dir);
+	mark_inode_dirty(new_dir);
+
+	if (has_diriter) {
+		diriter.fi.icb.extLocation =
+					cpu_to_lelb(UDF_I(new_dir)->i_location);
+		udf_update_tag((char *)&diriter.fi,
+			       udf_dir_entry_len(&diriter.fi));
+		udf_fiiter_write_fi(&diriter, NULL);
+		udf_fiiter_release(&diriter);
+
+		inode_dec_link_count(old_dir);
+		if (new_inode)
+			inode_dec_link_count(new_inode);
+		else {
+			inc_nlink(new_dir);
+			mark_inode_dirty(new_dir);
+		}
+	}
+	return 0;
+out_oiter:
+	if (has_diriter)
+		udf_fiiter_release(&diriter);
+	udf_fiiter_release(&oiter);
+
+	return retval;
+}
+
+static struct dentry *udf_get_parent(struct dentry *child)
+{
+	struct kernel_lb_addr tloc;
+	struct inode *inode = NULL;
+	struct udf_fileident_iter iter;
+	int err;
+
+	err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
+	if (err)
+		return ERR_PTR(err);
+
+	tloc = lelb_to_cpu(iter.fi.icb.extLocation);
+	udf_fiiter_release(&iter);
+	inode = udf_iget(child->d_sb, &tloc);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+
+	return d_obtain_alias(inode);
+}
+
+
+static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
+					u16 partref, __u32 generation)
+{
+	struct inode *inode;
+	struct kernel_lb_addr loc;
+
+	if (block == 0)
+		return ERR_PTR(-ESTALE);
+
+	loc.logicalBlockNum = block;
+	loc.partitionReferenceNum = partref;
+	inode = udf_iget(sb, &loc);
+
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+
+	if (generation && inode->i_generation != generation) {
+		iput(inode);
+		return ERR_PTR(-ESTALE);
+	}
+	return d_obtain_alias(inode);
+}
+
+static struct dentry *udf_fh_to_dentry(struct super_block *sb,
+				       struct fid *fid, int fh_len, int fh_type)
+{
+	if (fh_len < 3 ||
+	    (fh_type != FILEID_UDF_WITH_PARENT &&
+	     fh_type != FILEID_UDF_WITHOUT_PARENT))
+		return NULL;
+
+	return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
+			fid->udf.generation);
+}
+
+static struct dentry *udf_fh_to_parent(struct super_block *sb,
+				       struct fid *fid, int fh_len, int fh_type)
+{
+	if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
+		return NULL;
+
+	return udf_nfs_get_inode(sb, fid->udf.parent_block,
+				 fid->udf.parent_partref,
+				 fid->udf.parent_generation);
+}
+static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
+			 struct inode *parent)
+{
+	int len = *lenp;
+	struct kernel_lb_addr location = UDF_I(inode)->i_location;
+	struct fid *fid = (struct fid *)fh;
+	int type = FILEID_UDF_WITHOUT_PARENT;
+
+	if (parent && (len < 5)) {
+		*lenp = 5;
+		return FILEID_INVALID;
+	} else if (len < 3) {
+		*lenp = 3;
+		return FILEID_INVALID;
+	}
+
+	*lenp = 3;
+	fid->udf.block = location.logicalBlockNum;
+	fid->udf.partref = location.partitionReferenceNum;
+	fid->udf.parent_partref = 0;
+	fid->udf.generation = inode->i_generation;
+
+	if (parent) {
+		location = UDF_I(parent)->i_location;
+		fid->udf.parent_block = location.logicalBlockNum;
+		fid->udf.parent_partref = location.partitionReferenceNum;
+		fid->udf.parent_generation = inode->i_generation;
+		*lenp = 5;
+		type = FILEID_UDF_WITH_PARENT;
+	}
+
+	return type;
+}
+
+const struct export_operations udf_export_ops = {
+	.encode_fh	= udf_encode_fh,
+	.fh_to_dentry   = udf_fh_to_dentry,
+	.fh_to_parent   = udf_fh_to_parent,
+	.get_parent     = udf_get_parent,
+};
+
+const struct inode_operations udf_dir_inode_operations = {
+	.lookup				= udf_lookup,
+	.create				= udf_create,
+	.link				= udf_link,
+	.unlink				= udf_unlink,
+	.symlink			= udf_symlink,
+	.mkdir				= udf_mkdir,
+	.rmdir				= udf_rmdir,
+	.mknod				= udf_mknod,
+	.rename				= udf_rename,
+	.tmpfile			= udf_tmpfile,
+};