Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 1356 insertions, 0 deletions

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
new file mode 100644
index 000000000..1dfb9c36e
--- /dev/null
+++ b/fs/udf/namei.c
@@ -0,0 +1,1356 @@
+/*
+ * namei.c
+ *
+ * PURPOSE
+ *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
+ *
+ * COPYRIGHT
+ *      This file is distributed under the terms of the GNU General Public
+ *      License (GPL). Copies of the GPL can be obtained from:
+ *              ftp://prep.ai.mit.edu/pub/gnu/GPL
+ *      Each contributing author retains all rights to their own work.
+ *
+ *  (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);
+}
+
+int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
+		 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
+		 uint8_t *impuse, uint8_t *fileident)
+{
+	uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
+	uint16_t crc;
+	int offset;
+	uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
+	uint8_t lfi = cfi->lengthFileIdent;
+	int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
+		sizeof(struct fileIdentDesc);
+	int adinicb = 0;
+
+	if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		adinicb = 1;
+
+	offset = fibh->soffset + sizeof(struct fileIdentDesc);
+
+	if (impuse) {
+		if (adinicb || (offset + liu < 0)) {
+			memcpy((uint8_t *)sfi->impUse, impuse, liu);
+		} else if (offset >= 0) {
+			memcpy(fibh->ebh->b_data + offset, impuse, liu);
+		} else {
+			memcpy((uint8_t *)sfi->impUse, impuse, -offset);
+			memcpy(fibh->ebh->b_data, impuse - offset,
+				liu + offset);
+		}
+	}
+
+	offset += liu;
+
+	if (fileident) {
+		if (adinicb || (offset + lfi < 0)) {
+			memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
+		} else if (offset >= 0) {
+			memcpy(fibh->ebh->b_data + offset, fileident, lfi);
+		} else {
+			memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
+				-offset);
+			memcpy(fibh->ebh->b_data, fileident - offset,
+				lfi + offset);
+		}
+	}
+
+	offset += lfi;
+
+	if (adinicb || (offset + padlen < 0)) {
+		memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
+	} else if (offset >= 0) {
+		memset(fibh->ebh->b_data + offset, 0x00, padlen);
+	} else {
+		memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
+		memset(fibh->ebh->b_data, 0x00, padlen + offset);
+	}
+
+	crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
+		      sizeof(struct fileIdentDesc) - sizeof(struct tag));
+
+	if (fibh->sbh == fibh->ebh) {
+		crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
+			      crclen + sizeof(struct tag) -
+			      sizeof(struct fileIdentDesc));
+	} else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
+		crc = crc_itu_t(crc, fibh->ebh->b_data +
+					sizeof(struct fileIdentDesc) +
+					fibh->soffset,
+			      crclen + sizeof(struct tag) -
+					sizeof(struct fileIdentDesc));
+	} else {
+		crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
+			      -fibh->soffset - sizeof(struct fileIdentDesc));
+		crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
+	}
+
+	cfi->descTag.descCRC = cpu_to_le16(crc);
+	cfi->descTag.descCRCLength = cpu_to_le16(crclen);
+	cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
+
+	if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
+		memcpy((uint8_t *)sfi, (uint8_t *)cfi,
+			sizeof(struct fileIdentDesc));
+	} else {
+		memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
+		memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
+		       sizeof(struct fileIdentDesc) + fibh->soffset);
+	}
+
+	if (adinicb) {
+		mark_inode_dirty(inode);
+	} else {
+		if (fibh->sbh != fibh->ebh)
+			mark_buffer_dirty_inode(fibh->ebh, inode);
+		mark_buffer_dirty_inode(fibh->sbh, inode);
+	}
+	inode_inc_iversion(inode);
+
+	return 0;
+}
+
+/**
+ * udf_find_entry - find entry in given directory.
+ *
+ * @dir:	directory inode to search in
+ * @child:	qstr of the name
+ * @fibh:	buffer head / inode with file identifier descriptor we found
+ * @cfi:	found file identifier descriptor with given name
+ *
+ * This function searches in the directory @dir for a file name @child. When
+ * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
+ * directories) containing the file identifier descriptor (FID). In that case
+ * the function returns pointer to the FID in the buffer or inode - but note
+ * that FID may be split among two buffers (blocks) so accessing it via that
+ * pointer isn't easily possible. This pointer can be used only as an iterator
+ * for other directory manipulation functions. For inspection of the FID @cfi
+ * can be used - the found FID is copied there.
+ *
+ * Returns pointer to FID, NULL when nothing found, or error code.
+ */
+static struct fileIdentDesc *udf_find_entry(struct inode *dir,
+					    const struct qstr *child,
+					    struct udf_fileident_bh *fibh,
+					    struct fileIdentDesc *cfi)
+{
+	struct fileIdentDesc *fi = NULL;
+	loff_t f_pos;
+	udf_pblk_t block;
+	int flen;
+	unsigned char *fname = NULL, *copy_name = NULL;
+	unsigned char *nameptr;
+	uint8_t lfi;
+	uint16_t liu;
+	loff_t size;
+	struct kernel_lb_addr eloc;
+	uint32_t elen;
+	sector_t offset;
+	struct extent_position epos = {};
+	struct udf_inode_info *dinfo = UDF_I(dir);
+	int isdotdot = child->len == 2 &&
+		child->name[0] == '.' && child->name[1] == '.';
+	struct super_block *sb = dir->i_sb;
+
+	size = udf_ext0_offset(dir) + dir->i_size;
+	f_pos = udf_ext0_offset(dir);
+
+	fibh->sbh = fibh->ebh = NULL;
+	fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
+	if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
+		    &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
+			fi = ERR_PTR(-EIO);
+			goto out_err;
+		}
+
+		block = udf_get_lb_pblock(sb, &eloc, offset);
+		if ((++offset << sb->s_blocksize_bits) < elen) {
+			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+				epos.offset -= sizeof(struct short_ad);
+			else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+				epos.offset -= sizeof(struct long_ad);
+		} else
+			offset = 0;
+
+		fibh->sbh = fibh->ebh = udf_tread(sb, block);
+		if (!fibh->sbh) {
+			fi = ERR_PTR(-EIO);
+			goto out_err;
+		}
+	}
+
+	fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+	if (!fname) {
+		fi = ERR_PTR(-ENOMEM);
+		goto out_err;
+	}
+
+	while (f_pos < size) {
+		fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
+					&elen, &offset);
+		if (!fi) {
+			fi = ERR_PTR(-EIO);
+			goto out_err;
+		}
+
+		liu = le16_to_cpu(cfi->lengthOfImpUse);
+		lfi = cfi->lengthFileIdent;
+
+		if (fibh->sbh == fibh->ebh) {
+			nameptr = fi->fileIdent + liu;
+		} else {
+			int poffset;	/* Unpaded ending offset */
+
+			poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
+					liu + lfi;
+
+			if (poffset >= lfi)
+				nameptr = (uint8_t *)(fibh->ebh->b_data +
+						      poffset - lfi);
+			else {
+				if (!copy_name) {
+					copy_name = kmalloc(UDF_NAME_LEN,
+							    GFP_NOFS);
+					if (!copy_name) {
+						fi = ERR_PTR(-ENOMEM);
+						goto out_err;
+					}
+				}
+				nameptr = copy_name;
+				memcpy(nameptr, fi->fileIdent + liu,
+					lfi - poffset);
+				memcpy(nameptr + lfi - poffset,
+					fibh->ebh->b_data, poffset);
+			}
+		}
+
+		if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+				continue;
+		}
+
+		if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
+			if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+				continue;
+		}
+
+		if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
+		    isdotdot)
+			goto out_ok;
+
+		if (!lfi)
+			continue;
+
+		flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
+		if (flen < 0) {
+			fi = ERR_PTR(flen);
+			goto out_err;
+		}
+
+		if (udf_match(flen, fname, child->len, child->name))
+			goto out_ok;
+	}
+
+	fi = NULL;
+out_err:
+	if (fibh->sbh != fibh->ebh)
+		brelse(fibh->ebh);
+	brelse(fibh->sbh);
+out_ok:
+	brelse(epos.bh);
+	kfree(fname);
+	kfree(copy_name);
+
+	return fi;
+}
+
+static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
+				 unsigned int flags)
+{
+	struct inode *inode = NULL;
+	struct fileIdentDesc cfi;
+	struct udf_fileident_bh fibh;
+	struct fileIdentDesc *fi;
+
+	if (dentry->d_name.len > UDF_NAME_LEN)
+		return ERR_PTR(-ENAMETOOLONG);
+
+#ifdef UDF_RECOVERY
+	/* temporary shorthand for specifying files by inode number */
+	if (!strncmp(dentry->d_name.name, ".B=", 3)) {
+		struct kernel_lb_addr lb = {
+			.logicalBlockNum = 0,
+			.partitionReferenceNum =
+				simple_strtoul(dentry->d_name.name + 3,
+						NULL, 0),
+		};
+		inode = udf_iget(dir->i_sb, lb);
+		if (IS_ERR(inode))
+			return inode;
+	} else
+#endif /* UDF_RECOVERY */
+
+	fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
+	if (IS_ERR(fi))
+		return ERR_CAST(fi);
+
+	if (fi) {
+		struct kernel_lb_addr loc;
+
+		if (fibh.sbh != fibh.ebh)
+			brelse(fibh.ebh);
+		brelse(fibh.sbh);
+
+		loc = lelb_to_cpu(cfi.icb.extLocation);
+		inode = udf_iget(dir->i_sb, &loc);
+		if (IS_ERR(inode))
+			return ERR_CAST(inode);
+	}
+
+	return d_splice_alias(inode, dentry);
+}
+
+static struct fileIdentDesc *udf_add_entry(struct inode *dir,
+					   struct dentry *dentry,
+					   struct udf_fileident_bh *fibh,
+					   struct fileIdentDesc *cfi, int *err)
+{
+	struct super_block *sb = dir->i_sb;
+	struct fileIdentDesc *fi = NULL;
+	unsigned char *name = NULL;
+	int namelen;
+	loff_t f_pos;
+	loff_t size = udf_ext0_offset(dir) + dir->i_size;
+	int nfidlen;
+	udf_pblk_t block;
+	struct kernel_lb_addr eloc;
+	uint32_t elen = 0;
+	sector_t offset;
+	struct extent_position epos = {};
+	struct udf_inode_info *dinfo;
+
+	fibh->sbh = fibh->ebh = NULL;
+	name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
+	if (!name) {
+		*err = -ENOMEM;
+		goto out_err;
+	}
+
+	if (dentry) {
+		if (!dentry->d_name.len) {
+			*err = -EINVAL;
+			goto out_err;
+		}
+		namelen = udf_put_filename(sb, dentry->d_name.name,
+					   dentry->d_name.len,
+					   name, UDF_NAME_LEN_CS0);
+		if (!namelen) {
+			*err = -ENAMETOOLONG;
+			goto out_err;
+		}
+	} else {
+		namelen = 0;
+	}
+
+	nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
+
+	f_pos = udf_ext0_offset(dir);
+
+	fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
+	dinfo = UDF_I(dir);
+	if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
+		    &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
+			block = udf_get_lb_pblock(dir->i_sb,
+					&dinfo->i_location, 0);
+			fibh->soffset = fibh->eoffset = sb->s_blocksize;
+			goto add;
+		}
+		block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
+		if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
+			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+				epos.offset -= sizeof(struct short_ad);
+			else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+				epos.offset -= sizeof(struct long_ad);
+		} else
+			offset = 0;
+
+		fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
+		if (!fibh->sbh) {
+			*err = -EIO;
+			goto out_err;
+		}
+
+		block = dinfo->i_location.logicalBlockNum;
+	}
+
+	while (f_pos < size) {
+		fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
+					&elen, &offset);
+
+		if (!fi) {
+			*err = -EIO;
+			goto out_err;
+		}
+
+		if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
+			if (udf_dir_entry_len(cfi) == nfidlen) {
+				cfi->descTag.tagSerialNum = cpu_to_le16(1);
+				cfi->fileVersionNum = cpu_to_le16(1);
+				cfi->fileCharacteristics = 0;
+				cfi->lengthFileIdent = namelen;
+				cfi->lengthOfImpUse = cpu_to_le16(0);
+				if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
+						  name))
+					goto out_ok;
+				else {
+					*err = -EIO;
+					goto out_err;
+				}
+			}
+		}
+	}
+
+add:
+	f_pos += nfidlen;
+
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
+	    sb->s_blocksize - fibh->eoffset < nfidlen) {
+		brelse(epos.bh);
+		epos.bh = NULL;
+		fibh->soffset -= udf_ext0_offset(dir);
+		fibh->eoffset -= udf_ext0_offset(dir);
+		f_pos -= udf_ext0_offset(dir);
+		if (fibh->sbh != fibh->ebh)
+			brelse(fibh->ebh);
+		brelse(fibh->sbh);
+		fibh->sbh = fibh->ebh =
+				udf_expand_dir_adinicb(dir, &block, err);
+		if (!fibh->sbh)
+			goto out_err;
+		epos.block = dinfo->i_location;
+		epos.offset = udf_file_entry_alloc_offset(dir);
+		/* Load extent udf_expand_dir_adinicb() has created */
+		udf_current_aext(dir, &epos, &eloc, &elen, 1);
+	}
+
+	/* Entry fits into current block? */
+	if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
+		fibh->soffset = fibh->eoffset;
+		fibh->eoffset += nfidlen;
+		if (fibh->sbh != fibh->ebh) {
+			brelse(fibh->sbh);
+			fibh->sbh = fibh->ebh;
+		}
+
+		if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			block = dinfo->i_location.logicalBlockNum;
+			fi = (struct fileIdentDesc *)
+					(dinfo->i_ext.i_data +
+					 fibh->soffset -
+					 udf_ext0_offset(dir) +
+					 dinfo->i_lenEAttr);
+		} else {
+			block = eloc.logicalBlockNum +
+					((elen - 1) >>
+						dir->i_sb->s_blocksize_bits);
+			fi = (struct fileIdentDesc *)
+				(fibh->sbh->b_data + fibh->soffset);
+		}
+	} else {
+		/* Round up last extent in the file */
+		elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
+		if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+			epos.offset -= sizeof(struct short_ad);
+		else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+			epos.offset -= sizeof(struct long_ad);
+		udf_write_aext(dir, &epos, &eloc, elen, 1);
+		dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
+					- 1) & ~(sb->s_blocksize - 1);
+
+		fibh->soffset = fibh->eoffset - sb->s_blocksize;
+		fibh->eoffset += nfidlen - sb->s_blocksize;
+		if (fibh->sbh != fibh->ebh) {
+			brelse(fibh->sbh);
+			fibh->sbh = fibh->ebh;
+		}
+
+		block = eloc.logicalBlockNum + ((elen - 1) >>
+						dir->i_sb->s_blocksize_bits);
+		fibh->ebh = udf_bread(dir,
+				f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
+		if (!fibh->ebh)
+			goto out_err;
+		/* Extents could have been merged, invalidate our position */
+		brelse(epos.bh);
+		epos.bh = NULL;
+		epos.block = dinfo->i_location;
+		epos.offset = udf_file_entry_alloc_offset(dir);
+
+		if (!fibh->soffset) {
+			/* Find the freshly allocated block */
+			while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
+				(EXT_RECORDED_ALLOCATED >> 30))
+				;
+			block = eloc.logicalBlockNum + ((elen - 1) >>
+					dir->i_sb->s_blocksize_bits);
+			brelse(fibh->sbh);
+			fibh->sbh = fibh->ebh;
+			fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
+		} else {
+			fi = (struct fileIdentDesc *)
+				(fibh->sbh->b_data + sb->s_blocksize +
+					fibh->soffset);
+		}
+	}
+
+	memset(cfi, 0, sizeof(struct fileIdentDesc));
+	if (UDF_SB(sb)->s_udfrev >= 0x0200)
+		udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
+			    sizeof(struct tag));
+	else
+		udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
+			    sizeof(struct tag));
+	cfi->fileVersionNum = cpu_to_le16(1);
+	cfi->lengthFileIdent = namelen;
+	cfi->lengthOfImpUse = cpu_to_le16(0);
+	if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
+		dir->i_size += nfidlen;
+		if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+			dinfo->i_lenAlloc += nfidlen;
+		else {
+			/* Find the last extent and truncate it to proper size */
+			while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
+				(EXT_RECORDED_ALLOCATED >> 30))
+				;
+			elen -= dinfo->i_lenExtents - dir->i_size;
+			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+				epos.offset -= sizeof(struct short_ad);
+			else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+				epos.offset -= sizeof(struct long_ad);
+			udf_write_aext(dir, &epos, &eloc, elen, 1);
+			dinfo->i_lenExtents = dir->i_size;
+		}
+
+		mark_inode_dirty(dir);
+		goto out_ok;
+	} else {
+		*err = -EIO;
+		goto out_err;
+	}
+
+out_err:
+	fi = NULL;
+	if (fibh->sbh != fibh->ebh)
+		brelse(fibh->ebh);
+	brelse(fibh->sbh);
+out_ok:
+	brelse(epos.bh);
+	kfree(name);
+	return fi;
+}
+
+static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
+			    struct udf_fileident_bh *fibh,
+			    struct fileIdentDesc *cfi)
+{
+	cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
+
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
+		memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
+
+	return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
+}
+
+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_bh fibh;
+	struct fileIdentDesc cfi, *fi;
+	int err;
+
+	fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
+	if (unlikely(!fi)) {
+		inode_dec_link_count(inode);
+		discard_new_inode(inode);
+		return err;
+	}
+	cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
+		cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+	udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
+	dir->i_ctime = dir->i_mtime = current_time(dir);
+	mark_inode_dirty(dir);
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+	d_instantiate_new(dentry, inode);
+
+	return 0;
+}
+
+static int udf_create(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);
+
+	if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		inode->i_data.a_ops = &udf_adinicb_aops;
+	else
+		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 inode *dir, struct dentry *dentry, umode_t mode)
+{
+	struct inode *inode = udf_new_inode(dir, mode);
+
+	if (IS_ERR(inode))
+		return PTR_ERR(inode);
+
+	if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		inode->i_data.a_ops = &udf_adinicb_aops;
+	else
+		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(dentry, inode);
+	unlock_new_inode(inode);
+	return 0;
+}
+
+static int udf_mknod(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 inode *dir, struct dentry *dentry, umode_t mode)
+{
+	struct inode *inode;
+	struct udf_fileident_bh fibh;
+	struct fileIdentDesc cfi, *fi;
+	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;
+	fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
+	if (!fi) {
+		inode_dec_link_count(inode);
+		discard_new_inode(inode);
+		goto out;
+	}
+	set_nlink(inode, 2);
+	cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
+		cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
+	cfi.fileCharacteristics =
+			FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
+	udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
+	brelse(fibh.sbh);
+	mark_inode_dirty(inode);
+
+	fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
+	if (!fi) {
+		clear_nlink(inode);
+		mark_inode_dirty(inode);
+		discard_new_inode(inode);
+		goto out;
+	}
+	cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
+	*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
+		cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
+	cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
+	udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
+	inc_nlink(dir);
+	dir->i_ctime = dir->i_mtime = current_time(dir);
+	mark_inode_dirty(dir);
+	d_instantiate_new(dentry, inode);
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+	err = 0;
+
+out:
+	return err;
+}
+
+static int empty_dir(struct inode *dir)
+{
+	struct fileIdentDesc *fi, cfi;
+	struct udf_fileident_bh fibh;
+	loff_t f_pos;
+	loff_t size = udf_ext0_offset(dir) + dir->i_size;
+	udf_pblk_t block;
+	struct kernel_lb_addr eloc;
+	uint32_t elen;
+	sector_t offset;
+	struct extent_position epos = {};
+	struct udf_inode_info *dinfo = UDF_I(dir);
+
+	f_pos = udf_ext0_offset(dir);
+	fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
+
+	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		fibh.sbh = fibh.ebh = NULL;
+	else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
+			      &epos, &eloc, &elen, &offset) ==
+					(EXT_RECORDED_ALLOCATED >> 30)) {
+		block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
+		if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
+			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+				epos.offset -= sizeof(struct short_ad);
+			else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+				epos.offset -= sizeof(struct long_ad);
+		} else
+			offset = 0;
+
+		fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
+		if (!fibh.sbh) {
+			brelse(epos.bh);
+			return 0;
+		}
+	} else {
+		brelse(epos.bh);
+		return 0;
+	}
+
+	while (f_pos < size) {
+		fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
+					&elen, &offset);
+		if (!fi) {
+			if (fibh.sbh != fibh.ebh)
+				brelse(fibh.ebh);
+			brelse(fibh.sbh);
+			brelse(epos.bh);
+			return 0;
+		}
+
+		if (cfi.lengthFileIdent &&
+		    (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
+			if (fibh.sbh != fibh.ebh)
+				brelse(fibh.ebh);
+			brelse(fibh.sbh);
+			brelse(epos.bh);
+			return 0;
+		}
+	}
+
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+	brelse(epos.bh);
+
+	return 1;
+}
+
+static int udf_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int retval;
+	struct inode *inode = d_inode(dentry);
+	struct udf_fileident_bh fibh;
+	struct fileIdentDesc *fi, cfi;
+	struct kernel_lb_addr tloc;
+
+	retval = -ENOENT;
+	fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
+	if (IS_ERR_OR_NULL(fi)) {
+		if (fi)
+			retval = PTR_ERR(fi);
+		goto out;
+	}
+
+	retval = -EIO;
+	tloc = lelb_to_cpu(cfi.icb.extLocation);
+	if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
+		goto end_rmdir;
+	retval = -ENOTEMPTY;
+	if (!empty_dir(inode))
+		goto end_rmdir;
+	retval = udf_delete_entry(dir, fi, &fibh, &cfi);
+	if (retval)
+		goto end_rmdir;
+	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);
+	inode->i_ctime = dir->i_ctime = dir->i_mtime =
+						current_time(inode);
+	mark_inode_dirty(dir);
+
+end_rmdir:
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+
+out:
+	return retval;
+}
+
+static int udf_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int retval;
+	struct inode *inode = d_inode(dentry);
+	struct udf_fileident_bh fibh;
+	struct fileIdentDesc *fi;
+	struct fileIdentDesc cfi;
+	struct kernel_lb_addr tloc;
+
+	retval = -ENOENT;
+	fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
+
+	if (IS_ERR_OR_NULL(fi)) {
+		if (fi)
+			retval = PTR_ERR(fi);
+		goto out;
+	}
+
+	retval = -EIO;
+	tloc = lelb_to_cpu(cfi.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);
+	}
+	retval = udf_delete_entry(dir, fi, &fibh, &cfi);
+	if (retval)
+		goto end_unlink;
+	dir->i_ctime = dir->i_mtime = current_time(dir);
+	mark_inode_dirty(dir);
+	inode_dec_link_count(inode);
+	inode->i_ctime = dir->i_ctime;
+	retval = 0;
+
+end_unlink:
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+
+out:
+	return retval;
+}
+
+static int udf_symlink(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;
+		udf_add_aext(inode, &epos, &eloc, bsize, 0);
+		brelse(epos.bh);
+
+		block = udf_get_pblock(sb, block,
+				iinfo->i_location.partitionReferenceNum,
+				0);
+		epos.bh = udf_tgetblk(sb, block);
+		if (unlikely(!epos.bh)) {
+			err = -ENOMEM;
+			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_ext.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_bh fibh;
+	struct fileIdentDesc cfi, *fi;
+	int err;
+
+	fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
+	if (!fi) {
+		return err;
+	}
+	cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+	cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
+	if (UDF_SB(inode->i_sb)->s_lvid_bh) {
+		*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
+			cpu_to_le32(lvid_get_unique_id(inode->i_sb));
+	}
+	udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
+	if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		mark_inode_dirty(dir);
+
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+	inc_nlink(inode);
+	inode->i_ctime = current_time(inode);
+	mark_inode_dirty(inode);
+	dir->i_ctime = dir->i_mtime = current_time(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 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_bh ofibh, nfibh;
+	struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
+	struct fileIdentDesc ocfi, ncfi;
+	struct buffer_head *dir_bh = NULL;
+	int retval = -ENOENT;
+	struct kernel_lb_addr tloc;
+	struct udf_inode_info *old_iinfo = UDF_I(old_inode);
+
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
+	if (IS_ERR(ofi)) {
+		retval = PTR_ERR(ofi);
+		goto end_rename;
+	}
+
+	if (ofibh.sbh != ofibh.ebh)
+		brelse(ofibh.ebh);
+
+	brelse(ofibh.sbh);
+	tloc = lelb_to_cpu(ocfi.icb.extLocation);
+	if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
+	    != old_inode->i_ino)
+		goto end_rename;
+
+	nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
+	if (IS_ERR(nfi)) {
+		retval = PTR_ERR(nfi);
+		goto end_rename;
+	}
+	if (nfi && !new_inode) {
+		if (nfibh.sbh != nfibh.ebh)
+			brelse(nfibh.ebh);
+		brelse(nfibh.sbh);
+		nfi = NULL;
+	}
+	if (S_ISDIR(old_inode->i_mode)) {
+		int offset = udf_ext0_offset(old_inode);
+
+		if (new_inode) {
+			retval = -ENOTEMPTY;
+			if (!empty_dir(new_inode))
+				goto end_rename;
+		}
+		retval = -EIO;
+		if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			dir_fi = udf_get_fileident(
+					old_iinfo->i_ext.i_data -
+					  (old_iinfo->i_efe ?
+					   sizeof(struct extendedFileEntry) :
+					   sizeof(struct fileEntry)),
+					old_inode->i_sb->s_blocksize, &offset);
+		} else {
+			dir_bh = udf_bread(old_inode, 0, 0, &retval);
+			if (!dir_bh)
+				goto end_rename;
+			dir_fi = udf_get_fileident(dir_bh->b_data,
+					old_inode->i_sb->s_blocksize, &offset);
+		}
+		if (!dir_fi)
+			goto end_rename;
+		tloc = lelb_to_cpu(dir_fi->icb.extLocation);
+		if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
+				old_dir->i_ino)
+			goto end_rename;
+	}
+	if (!nfi) {
+		nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
+				    &retval);
+		if (!nfi)
+			goto end_rename;
+	}
+
+	/*
+	 * Like most other Unix systems, set the ctime for inodes on a
+	 * rename.
+	 */
+	old_inode->i_ctime = current_time(old_inode);
+	mark_inode_dirty(old_inode);
+
+	/*
+	 * ok, that's it
+	 */
+	ncfi.fileVersionNum = ocfi.fileVersionNum;
+	ncfi.fileCharacteristics = ocfi.fileCharacteristics;
+	memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
+	udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
+
+	/* The old fid may have moved - find it again */
+	ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
+	udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
+
+	if (new_inode) {
+		new_inode->i_ctime = current_time(new_inode);
+		inode_dec_link_count(new_inode);
+	}
+	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
+	new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
+	mark_inode_dirty(old_dir);
+	mark_inode_dirty(new_dir);
+
+	if (dir_fi) {
+		dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
+		udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
+		if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+			mark_inode_dirty(old_inode);
+		else
+			mark_buffer_dirty_inode(dir_bh, old_inode);
+
+		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);
+		}
+	}
+
+	if (ofi) {
+		if (ofibh.sbh != ofibh.ebh)
+			brelse(ofibh.ebh);
+		brelse(ofibh.sbh);
+	}
+
+	retval = 0;
+
+end_rename:
+	brelse(dir_bh);
+	if (nfi) {
+		if (nfibh.sbh != nfibh.ebh)
+			brelse(nfibh.ebh);
+		brelse(nfibh.sbh);
+	}
+
+	return retval;
+}
+
+static struct dentry *udf_get_parent(struct dentry *child)
+{
+	struct kernel_lb_addr tloc;
+	struct inode *inode = NULL;
+	struct qstr dotdot = QSTR_INIT("..", 2);
+	struct fileIdentDesc cfi;
+	struct udf_fileident_bh fibh;
+
+	if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
+		return ERR_PTR(-EACCES);
+
+	if (fibh.sbh != fibh.ebh)
+		brelse(fibh.ebh);
+	brelse(fibh.sbh);
+
+	tloc = lelb_to_cpu(cfi.icb.extLocation);
+	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,
+};