Initial import

1 files changed, 2291 insertions, 0 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
new file mode 100644
index 000000000..6afac3d56
--- /dev/null
+++ b/fs/udf/inode.c
@@ -0,0 +1,2291 @@
+/*
+ * inode.c
+ *
+ * PURPOSE
+ *  Inode 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 Dave Boynton
+ *  (C) 1998-2004 Ben Fennema
+ *  (C) 1999-2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ *  10/04/98 dgb  Added rudimentary directory functions
+ *  10/07/98      Fully working udf_block_map! It works!
+ *  11/25/98      bmap altered to better support extents
+ *  12/06/98 blf  partition support in udf_iget, udf_block_map
+ *                and udf_read_inode
+ *  12/12/98      rewrote udf_block_map to handle next extents and descs across
+ *                block boundaries (which is not actually allowed)
+ *  12/20/98      added support for strategy 4096
+ *  03/07/99      rewrote udf_block_map (again)
+ *                New funcs, inode_bmap, udf_next_aext
+ *  04/19/99      Support for writing device EA's for major/minor #
+ */
+
+#include "udfdecl.h"
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/writeback.h>
+#include <linux/slab.h>
+#include <linux/crc-itu-t.h>
+#include <linux/mpage.h>
+#include <linux/uio.h>
+
+#include "udf_i.h"
+#include "udf_sb.h"
+
+MODULE_AUTHOR("Ben Fennema");
+MODULE_DESCRIPTION("Universal Disk Format Filesystem");
+MODULE_LICENSE("GPL");
+
+#define EXTENT_MERGE_SIZE 5
+
+static umode_t udf_convert_permissions(struct fileEntry *);
+static int udf_update_inode(struct inode *, int);
+static int udf_sync_inode(struct inode *inode);
+static int udf_alloc_i_data(struct inode *inode, size_t size);
+static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
+static int8_t udf_insert_aext(struct inode *, struct extent_position,
+			      struct kernel_lb_addr, uint32_t);
+static void udf_split_extents(struct inode *, int *, int, int,
+			      struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
+static void udf_prealloc_extents(struct inode *, int, int,
+				 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
+static void udf_merge_extents(struct inode *,
+			      struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
+static void udf_update_extents(struct inode *,
+			       struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
+			       struct extent_position *);
+static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
+
+static void __udf_clear_extent_cache(struct inode *inode)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	if (iinfo->cached_extent.lstart != -1) {
+		brelse(iinfo->cached_extent.epos.bh);
+		iinfo->cached_extent.lstart = -1;
+	}
+}
+
+/* Invalidate extent cache */
+static void udf_clear_extent_cache(struct inode *inode)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	spin_lock(&iinfo->i_extent_cache_lock);
+	__udf_clear_extent_cache(inode);
+	spin_unlock(&iinfo->i_extent_cache_lock);
+}
+
+/* Return contents of extent cache */
+static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
+				 loff_t *lbcount, struct extent_position *pos)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	int ret = 0;
+
+	spin_lock(&iinfo->i_extent_cache_lock);
+	if ((iinfo->cached_extent.lstart <= bcount) &&
+	    (iinfo->cached_extent.lstart != -1)) {
+		/* Cache hit */
+		*lbcount = iinfo->cached_extent.lstart;
+		memcpy(pos, &iinfo->cached_extent.epos,
+		       sizeof(struct extent_position));
+		if (pos->bh)
+			get_bh(pos->bh);
+		ret = 1;
+	}
+	spin_unlock(&iinfo->i_extent_cache_lock);
+	return ret;
+}
+
+/* Add extent to extent cache */
+static void udf_update_extent_cache(struct inode *inode, loff_t estart,
+				    struct extent_position *pos, int next_epos)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	spin_lock(&iinfo->i_extent_cache_lock);
+	/* Invalidate previously cached extent */
+	__udf_clear_extent_cache(inode);
+	if (pos->bh)
+		get_bh(pos->bh);
+	memcpy(&iinfo->cached_extent.epos, pos,
+	       sizeof(struct extent_position));
+	iinfo->cached_extent.lstart = estart;
+	if (next_epos)
+		switch (iinfo->i_alloc_type) {
+		case ICBTAG_FLAG_AD_SHORT:
+			iinfo->cached_extent.epos.offset -=
+			sizeof(struct short_ad);
+			break;
+		case ICBTAG_FLAG_AD_LONG:
+			iinfo->cached_extent.epos.offset -=
+			sizeof(struct long_ad);
+		}
+	spin_unlock(&iinfo->i_extent_cache_lock);
+}
+
+void udf_evict_inode(struct inode *inode)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	int want_delete = 0;
+
+	if (!inode->i_nlink && !is_bad_inode(inode)) {
+		want_delete = 1;
+		udf_setsize(inode, 0);
+		udf_update_inode(inode, IS_SYNC(inode));
+	}
+	truncate_inode_pages_final(&inode->i_data);
+	invalidate_inode_buffers(inode);
+	clear_inode(inode);
+	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
+	    inode->i_size != iinfo->i_lenExtents) {
+		udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
+			 inode->i_ino, inode->i_mode,
+			 (unsigned long long)inode->i_size,
+			 (unsigned long long)iinfo->i_lenExtents);
+	}
+	kfree(iinfo->i_ext.i_data);
+	iinfo->i_ext.i_data = NULL;
+	udf_clear_extent_cache(inode);
+	if (want_delete) {
+		udf_free_inode(inode);
+	}
+}
+
+static void udf_write_failed(struct address_space *mapping, loff_t to)
+{
+	struct inode *inode = mapping->host;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	loff_t isize = inode->i_size;
+
+	if (to > isize) {
+		truncate_pagecache(inode, isize);
+		if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+			down_write(&iinfo->i_data_sem);
+			udf_clear_extent_cache(inode);
+			udf_truncate_extents(inode);
+			up_write(&iinfo->i_data_sem);
+		}
+	}
+}
+
+static int udf_writepage(struct page *page, struct writeback_control *wbc)
+{
+	return block_write_full_page(page, udf_get_block, wbc);
+}
+
+static int udf_writepages(struct address_space *mapping,
+			struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, udf_get_block);
+}
+
+static int udf_readpage(struct file *file, struct page *page)
+{
+	return mpage_readpage(page, udf_get_block);
+}
+
+static int udf_readpages(struct file *file, struct address_space *mapping,
+			struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
+}
+
+static int udf_write_begin(struct file *file, struct address_space *mapping,
+			loff_t pos, unsigned len, unsigned flags,
+			struct page **pagep, void **fsdata)
+{
+	int ret;
+
+	ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
+	if (unlikely(ret))
+		udf_write_failed(mapping, pos + len);
+	return ret;
+}
+
+static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
+			     loff_t offset)
+{
+	struct file *file = iocb->ki_filp;
+	struct address_space *mapping = file->f_mapping;
+	struct inode *inode = mapping->host;
+	size_t count = iov_iter_count(iter);
+	ssize_t ret;
+
+	ret = blockdev_direct_IO(iocb, inode, iter, offset, udf_get_block);
+	if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
+		udf_write_failed(mapping, offset + count);
+	return ret;
+}
+
+static sector_t udf_bmap(struct address_space *mapping, sector_t block)
+{
+	return generic_block_bmap(mapping, block, udf_get_block);
+}
+
+const struct address_space_operations udf_aops = {
+	.readpage	= udf_readpage,
+	.readpages	= udf_readpages,
+	.writepage	= udf_writepage,
+	.writepages	= udf_writepages,
+	.write_begin	= udf_write_begin,
+	.write_end	= generic_write_end,
+	.direct_IO	= udf_direct_IO,
+	.bmap		= udf_bmap,
+};
+
+/*
+ * Expand file stored in ICB to a normal one-block-file
+ *
+ * This function requires i_data_sem for writing and releases it.
+ * This function requires i_mutex held
+ */
+int udf_expand_file_adinicb(struct inode *inode)
+{
+	struct page *page;
+	char *kaddr;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	int err;
+	struct writeback_control udf_wbc = {
+		.sync_mode = WB_SYNC_NONE,
+		.nr_to_write = 1,
+	};
+
+	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
+	if (!iinfo->i_lenAlloc) {
+		if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+			iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
+		else
+			iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+		/* from now on we have normal address_space methods */
+		inode->i_data.a_ops = &udf_aops;
+		up_write(&iinfo->i_data_sem);
+		mark_inode_dirty(inode);
+		return 0;
+	}
+	/*
+	 * Release i_data_sem so that we can lock a page - page lock ranks
+	 * above i_data_sem. i_mutex still protects us against file changes.
+	 */
+	up_write(&iinfo->i_data_sem);
+
+	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+	if (!page)
+		return -ENOMEM;
+
+	if (!PageUptodate(page)) {
+		kaddr = kmap(page);
+		memset(kaddr + iinfo->i_lenAlloc, 0x00,
+		       PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
+		memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
+			iinfo->i_lenAlloc);
+		flush_dcache_page(page);
+		SetPageUptodate(page);
+		kunmap(page);
+	}
+	down_write(&iinfo->i_data_sem);
+	memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
+	       iinfo->i_lenAlloc);
+	iinfo->i_lenAlloc = 0;
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
+		iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
+	else
+		iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+	/* from now on we have normal address_space methods */
+	inode->i_data.a_ops = &udf_aops;
+	up_write(&iinfo->i_data_sem);
+	err = inode->i_data.a_ops->writepage(page, &udf_wbc);
+	if (err) {
+		/* Restore everything back so that we don't lose data... */
+		lock_page(page);
+		kaddr = kmap(page);
+		down_write(&iinfo->i_data_sem);
+		memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
+		       inode->i_size);
+		kunmap(page);
+		unlock_page(page);
+		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+		inode->i_data.a_ops = &udf_adinicb_aops;
+		up_write(&iinfo->i_data_sem);
+	}
+	page_cache_release(page);
+	mark_inode_dirty(inode);
+
+	return err;
+}
+
+struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
+					   int *err)
+{
+	int newblock;
+	struct buffer_head *dbh = NULL;
+	struct kernel_lb_addr eloc;
+	uint8_t alloctype;
+	struct extent_position epos;
+
+	struct udf_fileident_bh sfibh, dfibh;
+	loff_t f_pos = udf_ext0_offset(inode);
+	int size = udf_ext0_offset(inode) + inode->i_size;
+	struct fileIdentDesc cfi, *sfi, *dfi;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	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 NULL;
+	}
+
+	/* alloc block, and copy data to it */
+	*block = udf_new_block(inode->i_sb, inode,
+			       iinfo->i_location.partitionReferenceNum,
+			       iinfo->i_location.logicalBlockNum, err);
+	if (!(*block))
+		return NULL;
+	newblock = udf_get_pblock(inode->i_sb, *block,
+				  iinfo->i_location.partitionReferenceNum,
+				0);
+	if (!newblock)
+		return NULL;
+	dbh = udf_tgetblk(inode->i_sb, newblock);
+	if (!dbh)
+		return NULL;
+	lock_buffer(dbh);
+	memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
+	set_buffer_uptodate(dbh);
+	unlock_buffer(dbh);
+	mark_buffer_dirty_inode(dbh, inode);
+
+	sfibh.soffset = sfibh.eoffset =
+			f_pos & (inode->i_sb->s_blocksize - 1);
+	sfibh.sbh = sfibh.ebh = NULL;
+	dfibh.soffset = dfibh.eoffset = 0;
+	dfibh.sbh = dfibh.ebh = dbh;
+	while (f_pos < size) {
+		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+		sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
+					 NULL, NULL, NULL);
+		if (!sfi) {
+			brelse(dbh);
+			return NULL;
+		}
+		iinfo->i_alloc_type = alloctype;
+		sfi->descTag.tagLocation = cpu_to_le32(*block);
+		dfibh.soffset = dfibh.eoffset;
+		dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
+		dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
+		if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
+				 sfi->fileIdent +
+					le16_to_cpu(sfi->lengthOfImpUse))) {
+			iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+			brelse(dbh);
+			return NULL;
+		}
+	}
+	mark_buffer_dirty_inode(dbh, inode);
+
+	memset(iinfo->i_ext.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);
+	udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
+	/* UniqueID stuff */
+
+	brelse(epos.bh);
+	mark_inode_dirty(inode);
+	return dbh;
+}
+
+static int udf_get_block(struct inode *inode, sector_t block,
+			 struct buffer_head *bh_result, int create)
+{
+	int err, new;
+	sector_t phys = 0;
+	struct udf_inode_info *iinfo;
+
+	if (!create) {
+		phys = udf_block_map(inode, block);
+		if (phys)
+			map_bh(bh_result, inode->i_sb, phys);
+		return 0;
+	}
+
+	err = -EIO;
+	new = 0;
+	iinfo = UDF_I(inode);
+
+	down_write(&iinfo->i_data_sem);
+	if (block == iinfo->i_next_alloc_block + 1) {
+		iinfo->i_next_alloc_block++;
+		iinfo->i_next_alloc_goal++;
+	}
+
+	udf_clear_extent_cache(inode);
+	phys = inode_getblk(inode, block, &err, &new);
+	if (!phys)
+		goto abort;
+
+	if (new)
+		set_buffer_new(bh_result);
+	map_bh(bh_result, inode->i_sb, phys);
+
+abort:
+	up_write(&iinfo->i_data_sem);
+	return err;
+}
+
+static struct buffer_head *udf_getblk(struct inode *inode, long block,
+				      int create, int *err)
+{
+	struct buffer_head *bh;
+	struct buffer_head dummy;
+
+	dummy.b_state = 0;
+	dummy.b_blocknr = -1000;
+	*err = udf_get_block(inode, block, &dummy, create);
+	if (!*err && buffer_mapped(&dummy)) {
+		bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
+		if (buffer_new(&dummy)) {
+			lock_buffer(bh);
+			memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
+			set_buffer_uptodate(bh);
+			unlock_buffer(bh);
+			mark_buffer_dirty_inode(bh, inode);
+		}
+		return bh;
+	}
+
+	return NULL;
+}
+
+/* Extend the file by 'blocks' blocks, return the number of extents added */
+static int udf_do_extend_file(struct inode *inode,
+			      struct extent_position *last_pos,
+			      struct kernel_long_ad *last_ext,
+			      sector_t blocks)
+{
+	sector_t add;
+	int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+	struct super_block *sb = inode->i_sb;
+	struct kernel_lb_addr prealloc_loc = {};
+	int prealloc_len = 0;
+	struct udf_inode_info *iinfo;
+	int err;
+
+	/* The previous extent is fake and we should not extend by anything
+	 * - there's nothing to do... */
+	if (!blocks && fake)
+		return 0;
+
+	iinfo = UDF_I(inode);
+	/* Round the last extent up to a multiple of block size */
+	if (last_ext->extLength & (sb->s_blocksize - 1)) {
+		last_ext->extLength =
+			(last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
+			(((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
+			  sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
+		iinfo->i_lenExtents =
+			(iinfo->i_lenExtents + sb->s_blocksize - 1) &
+			~(sb->s_blocksize - 1);
+	}
+
+	/* Last extent are just preallocated blocks? */
+	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
+						EXT_NOT_RECORDED_ALLOCATED) {
+		/* Save the extent so that we can reattach it to the end */
+		prealloc_loc = last_ext->extLocation;
+		prealloc_len = last_ext->extLength;
+		/* Mark the extent as a hole */
+		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+			(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
+		last_ext->extLocation.logicalBlockNum = 0;
+		last_ext->extLocation.partitionReferenceNum = 0;
+	}
+
+	/* Can we merge with the previous extent? */
+	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
+					EXT_NOT_RECORDED_NOT_ALLOCATED) {
+		add = ((1 << 30) - sb->s_blocksize -
+			(last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
+			sb->s_blocksize_bits;
+		if (add > blocks)
+			add = blocks;
+		blocks -= add;
+		last_ext->extLength += add << sb->s_blocksize_bits;
+	}
+
+	if (fake) {
+		udf_add_aext(inode, last_pos, &last_ext->extLocation,
+			     last_ext->extLength, 1);
+		count++;
+	} else
+		udf_write_aext(inode, last_pos, &last_ext->extLocation,
+				last_ext->extLength, 1);
+
+	/* Managed to do everything necessary? */
+	if (!blocks)
+		goto out;
+
+	/* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
+	last_ext->extLocation.logicalBlockNum = 0;
+	last_ext->extLocation.partitionReferenceNum = 0;
+	add = (1 << (30-sb->s_blocksize_bits)) - 1;
+	last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+				(add << sb->s_blocksize_bits);
+
+	/* Create enough extents to cover the whole hole */
+	while (blocks > add) {
+		blocks -= add;
+		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+				   last_ext->extLength, 1);
+		if (err)
+			return err;
+		count++;
+	}
+	if (blocks) {
+		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+			(blocks << sb->s_blocksize_bits);
+		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+				   last_ext->extLength, 1);
+		if (err)
+			return err;
+		count++;
+	}
+
+out:
+	/* Do we have some preallocated blocks saved? */
+	if (prealloc_len) {
+		err = udf_add_aext(inode, last_pos, &prealloc_loc,
+				   prealloc_len, 1);
+		if (err)
+			return err;
+		last_ext->extLocation = prealloc_loc;
+		last_ext->extLength = prealloc_len;
+		count++;
+	}
+
+	/* last_pos should point to the last written extent... */
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		last_pos->offset -= sizeof(struct short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		last_pos->offset -= sizeof(struct long_ad);
+	else
+		return -EIO;
+
+	return count;
+}
+
+static int udf_extend_file(struct inode *inode, loff_t newsize)
+{
+
+	struct extent_position epos;
+	struct kernel_lb_addr eloc;
+	uint32_t elen;
+	int8_t etype;
+	struct super_block *sb = inode->i_sb;
+	sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
+	int adsize;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	struct kernel_long_ad extent;
+	int err;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(struct short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(struct long_ad);
+	else
+		BUG();
+
+	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
+
+	/* File has extent covering the new size (could happen when extending
+	 * inside a block)? */
+	if (etype != -1)
+		return 0;
+	if (newsize & (sb->s_blocksize - 1))
+		offset++;
+	/* Extended file just to the boundary of the last file block? */
+	if (offset == 0)
+		return 0;
+
+	/* Truncate is extending the file by 'offset' blocks */
+	if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
+	    (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
+		/* File has no extents at all or has empty last
+		 * indirect extent! Create a fake extent... */
+		extent.extLocation.logicalBlockNum = 0;
+		extent.extLocation.partitionReferenceNum = 0;
+		extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+	} else {
+		epos.offset -= adsize;
+		etype = udf_next_aext(inode, &epos, &extent.extLocation,
+				      &extent.extLength, 0);
+		extent.extLength |= etype << 30;
+	}
+	err = udf_do_extend_file(inode, &epos, &extent, offset);
+	if (err < 0)
+		goto out;
+	err = 0;
+	iinfo->i_lenExtents = newsize;
+out:
+	brelse(epos.bh);
+	return err;
+}
+
+static sector_t inode_getblk(struct inode *inode, sector_t block,
+			     int *err, int *new)
+{
+	struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
+	struct extent_position prev_epos, cur_epos, next_epos;
+	int count = 0, startnum = 0, endnum = 0;
+	uint32_t elen = 0, tmpelen;
+	struct kernel_lb_addr eloc, tmpeloc;
+	int c = 1;
+	loff_t lbcount = 0, b_off = 0;
+	uint32_t newblocknum, newblock;
+	sector_t offset = 0;
+	int8_t etype;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
+	int lastblock = 0;
+	bool isBeyondEOF;
+
+	*err = 0;
+	*new = 0;
+	prev_epos.offset = udf_file_entry_alloc_offset(inode);
+	prev_epos.block = iinfo->i_location;
+	prev_epos.bh = NULL;
+	cur_epos = next_epos = prev_epos;
+	b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
+
+	/* find the extent which contains the block we are looking for.
+	   alternate between laarr[0] and laarr[1] for locations of the
+	   current extent, and the previous extent */
+	do {
+		if (prev_epos.bh != cur_epos.bh) {
+			brelse(prev_epos.bh);
+			get_bh(cur_epos.bh);
+			prev_epos.bh = cur_epos.bh;
+		}
+		if (cur_epos.bh != next_epos.bh) {
+			brelse(cur_epos.bh);
+			get_bh(next_epos.bh);
+			cur_epos.bh = next_epos.bh;
+		}
+
+		lbcount += elen;
+
+		prev_epos.block = cur_epos.block;
+		cur_epos.block = next_epos.block;
+
+		prev_epos.offset = cur_epos.offset;
+		cur_epos.offset = next_epos.offset;
+
+		etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
+		if (etype == -1)
+			break;
+
+		c = !c;
+
+		laarr[c].extLength = (etype << 30) | elen;
+		laarr[c].extLocation = eloc;
+
+		if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
+			pgoal = eloc.logicalBlockNum +
+				((elen + inode->i_sb->s_blocksize - 1) >>
+				 inode->i_sb->s_blocksize_bits);
+
+		count++;
+	} while (lbcount + elen <= b_off);
+
+	b_off -= lbcount;
+	offset = b_off >> inode->i_sb->s_blocksize_bits;
+	/*
+	 * Move prev_epos and cur_epos into indirect extent if we are at
+	 * the pointer to it
+	 */
+	udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
+	udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
+
+	/* if the extent is allocated and recorded, return the block
+	   if the extent is not a multiple of the blocksize, round up */
+
+	if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
+		if (elen & (inode->i_sb->s_blocksize - 1)) {
+			elen = EXT_RECORDED_ALLOCATED |
+				((elen + inode->i_sb->s_blocksize - 1) &
+				 ~(inode->i_sb->s_blocksize - 1));
+			udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
+		}
+		brelse(prev_epos.bh);
+		brelse(cur_epos.bh);
+		brelse(next_epos.bh);
+		newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
+		return newblock;
+	}
+
+	/* Are we beyond EOF? */
+	if (etype == -1) {
+		int ret;
+		isBeyondEOF = true;
+		if (count) {
+			if (c)
+				laarr[0] = laarr[1];
+			startnum = 1;
+		} else {
+			/* Create a fake extent when there's not one */
+			memset(&laarr[0].extLocation, 0x00,
+				sizeof(struct kernel_lb_addr));
+			laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+			/* Will udf_do_extend_file() create real extent from
+			   a fake one? */
+			startnum = (offset > 0);
+		}
+		/* Create extents for the hole between EOF and offset */
+		ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
+		if (ret < 0) {
+			brelse(prev_epos.bh);
+			brelse(cur_epos.bh);
+			brelse(next_epos.bh);
+			*err = ret;
+			return 0;
+		}
+		c = 0;
+		offset = 0;
+		count += ret;
+		/* We are not covered by a preallocated extent? */
+		if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
+						EXT_NOT_RECORDED_ALLOCATED) {
+			/* Is there any real extent? - otherwise we overwrite
+			 * the fake one... */
+			if (count)
+				c = !c;
+			laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
+				inode->i_sb->s_blocksize;
+			memset(&laarr[c].extLocation, 0x00,
+				sizeof(struct kernel_lb_addr));
+			count++;
+		}
+		endnum = c + 1;
+		lastblock = 1;
+	} else {
+		isBeyondEOF = false;
+		endnum = startnum = ((count > 2) ? 2 : count);
+
+		/* if the current extent is in position 0,
+		   swap it with the previous */
+		if (!c && count != 1) {
+			laarr[2] = laarr[0];
+			laarr[0] = laarr[1];
+			laarr[1] = laarr[2];
+			c = 1;
+		}
+
+		/* if the current block is located in an extent,
+		   read the next extent */
+		etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
+		if (etype != -1) {
+			laarr[c + 1].extLength = (etype << 30) | elen;
+			laarr[c + 1].extLocation = eloc;
+			count++;
+			startnum++;
+			endnum++;
+		} else
+			lastblock = 1;
+	}
+
+	/* if the current extent is not recorded but allocated, get the
+	 * block in the extent corresponding to the requested block */
+	if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
+		newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
+	else { /* otherwise, allocate a new block */
+		if (iinfo->i_next_alloc_block == block)
+			goal = iinfo->i_next_alloc_goal;
+
+		if (!goal) {
+			if (!(goal = pgoal)) /* XXX: what was intended here? */
+				goal = iinfo->i_location.logicalBlockNum + 1;
+		}
+
+		newblocknum = udf_new_block(inode->i_sb, inode,
+				iinfo->i_location.partitionReferenceNum,
+				goal, err);
+		if (!newblocknum) {
+			brelse(prev_epos.bh);
+			brelse(cur_epos.bh);
+			brelse(next_epos.bh);
+			*err = -ENOSPC;
+			return 0;
+		}
+		if (isBeyondEOF)
+			iinfo->i_lenExtents += inode->i_sb->s_blocksize;
+	}
+
+	/* if the extent the requsted block is located in contains multiple
+	 * blocks, split the extent into at most three extents. blocks prior
+	 * to requested block, requested block, and blocks after requested
+	 * block */
+	udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
+
+#ifdef UDF_PREALLOCATE
+	/* We preallocate blocks only for regular files. It also makes sense
+	 * for directories but there's a problem when to drop the
+	 * preallocation. We might use some delayed work for that but I feel
+	 * it's overengineering for a filesystem like UDF. */
+	if (S_ISREG(inode->i_mode))
+		udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
+#endif
+
+	/* merge any continuous blocks in laarr */
+	udf_merge_extents(inode, laarr, &endnum);
+
+	/* write back the new extents, inserting new extents if the new number
+	 * of extents is greater than the old number, and deleting extents if
+	 * the new number of extents is less than the old number */
+	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
+
+	brelse(prev_epos.bh);
+	brelse(cur_epos.bh);
+	brelse(next_epos.bh);
+
+	newblock = udf_get_pblock(inode->i_sb, newblocknum,
+				iinfo->i_location.partitionReferenceNum, 0);
+	if (!newblock) {
+		*err = -EIO;
+		return 0;
+	}
+	*new = 1;
+	iinfo->i_next_alloc_block = block;
+	iinfo->i_next_alloc_goal = newblocknum;
+	inode->i_ctime = current_fs_time(inode->i_sb);
+
+	if (IS_SYNC(inode))
+		udf_sync_inode(inode);
+	else
+		mark_inode_dirty(inode);
+
+	return newblock;
+}
+
+static void udf_split_extents(struct inode *inode, int *c, int offset,
+			      int newblocknum,
+			      struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
+			      int *endnum)
+{
+	unsigned long blocksize = inode->i_sb->s_blocksize;
+	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+
+	if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
+	    (laarr[*c].extLength >> 30) ==
+				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
+		int curr = *c;
+		int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
+			    blocksize - 1) >> blocksize_bits;
+		int8_t etype = (laarr[curr].extLength >> 30);
+
+		if (blen == 1)
+			;
+		else if (!offset || blen == offset + 1) {
+			laarr[curr + 2] = laarr[curr + 1];
+			laarr[curr + 1] = laarr[curr];
+		} else {
+			laarr[curr + 3] = laarr[curr + 1];
+			laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
+		}
+
+		if (offset) {
+			if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+				udf_free_blocks(inode->i_sb, inode,
+						&laarr[curr].extLocation,
+						0, offset);
+				laarr[curr].extLength =
+					EXT_NOT_RECORDED_NOT_ALLOCATED |
+					(offset << blocksize_bits);
+				laarr[curr].extLocation.logicalBlockNum = 0;
+				laarr[curr].extLocation.
+						partitionReferenceNum = 0;
+			} else
+				laarr[curr].extLength = (etype << 30) |
+					(offset << blocksize_bits);
+			curr++;
+			(*c)++;
+			(*endnum)++;
+		}
+
+		laarr[curr].extLocation.logicalBlockNum = newblocknum;
+		if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
+			laarr[curr].extLocation.partitionReferenceNum =
+				UDF_I(inode)->i_location.partitionReferenceNum;
+		laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
+			blocksize;
+		curr++;
+
+		if (blen != offset + 1) {
+			if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
+				laarr[curr].extLocation.logicalBlockNum +=
+								offset + 1;
+			laarr[curr].extLength = (etype << 30) |
+				((blen - (offset + 1)) << blocksize_bits);
+			curr++;
+			(*endnum)++;
+		}
+	}
+}
+
+static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
+				 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
+				 int *endnum)
+{
+	int start, length = 0, currlength = 0, i;
+
+	if (*endnum >= (c + 1)) {
+		if (!lastblock)
+			return;
+		else
+			start = c;
+	} else {
+		if ((laarr[c + 1].extLength >> 30) ==
+					(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+			start = c + 1;
+			length = currlength =
+				(((laarr[c + 1].extLength &
+					UDF_EXTENT_LENGTH_MASK) +
+				inode->i_sb->s_blocksize - 1) >>
+				inode->i_sb->s_blocksize_bits);
+		} else
+			start = c;
+	}
+
+	for (i = start + 1; i <= *endnum; i++) {
+		if (i == *endnum) {
+			if (lastblock)
+				length += UDF_DEFAULT_PREALLOC_BLOCKS;
+		} else if ((laarr[i].extLength >> 30) ==
+				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
+			length += (((laarr[i].extLength &
+						UDF_EXTENT_LENGTH_MASK) +
+				    inode->i_sb->s_blocksize - 1) >>
+				    inode->i_sb->s_blocksize_bits);
+		} else
+			break;
+	}
+
+	if (length) {
+		int next = laarr[start].extLocation.logicalBlockNum +
+			(((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
+			  inode->i_sb->s_blocksize - 1) >>
+			  inode->i_sb->s_blocksize_bits);
+		int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
+				laarr[start].extLocation.partitionReferenceNum,
+				next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
+				length : UDF_DEFAULT_PREALLOC_BLOCKS) -
+				currlength);
+		if (numalloc) 	{
+			if (start == (c + 1))
+				laarr[start].extLength +=
+					(numalloc <<
+					 inode->i_sb->s_blocksize_bits);
+			else {
+				memmove(&laarr[c + 2], &laarr[c + 1],
+					sizeof(struct long_ad) * (*endnum - (c + 1)));
+				(*endnum)++;
+				laarr[c + 1].extLocation.logicalBlockNum = next;
+				laarr[c + 1].extLocation.partitionReferenceNum =
+					laarr[c].extLocation.
+							partitionReferenceNum;
+				laarr[c + 1].extLength =
+					EXT_NOT_RECORDED_ALLOCATED |
+					(numalloc <<
+					 inode->i_sb->s_blocksize_bits);
+				start = c + 1;
+			}
+
+			for (i = start + 1; numalloc && i < *endnum; i++) {
+				int elen = ((laarr[i].extLength &
+						UDF_EXTENT_LENGTH_MASK) +
+					    inode->i_sb->s_blocksize - 1) >>
+					    inode->i_sb->s_blocksize_bits;
+
+				if (elen > numalloc) {
+					laarr[i].extLength -=
+						(numalloc <<
+						 inode->i_sb->s_blocksize_bits);
+					numalloc = 0;
+				} else {
+					numalloc -= elen;
+					if (*endnum > (i + 1))
+						memmove(&laarr[i],
+							&laarr[i + 1],
+							sizeof(struct long_ad) *
+							(*endnum - (i + 1)));
+					i--;
+					(*endnum)--;
+				}
+			}
+			UDF_I(inode)->i_lenExtents +=
+				numalloc << inode->i_sb->s_blocksize_bits;
+		}
+	}
+}
+
+static void udf_merge_extents(struct inode *inode,
+			      struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
+			      int *endnum)
+{
+	int i;
+	unsigned long blocksize = inode->i_sb->s_blocksize;
+	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+
+	for (i = 0; i < (*endnum - 1); i++) {
+		struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
+		struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
+
+		if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
+			(((li->extLength >> 30) ==
+				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
+			((lip1->extLocation.logicalBlockNum -
+			  li->extLocation.logicalBlockNum) ==
+			(((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+			blocksize - 1) >> blocksize_bits)))) {
+
+			if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+				(lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
+				blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
+				lip1->extLength = (lip1->extLength -
+						  (li->extLength &
+						   UDF_EXTENT_LENGTH_MASK) +
+						   UDF_EXTENT_LENGTH_MASK) &
+							~(blocksize - 1);
+				li->extLength = (li->extLength &
+						 UDF_EXTENT_FLAG_MASK) +
+						(UDF_EXTENT_LENGTH_MASK + 1) -
+						blocksize;
+				lip1->extLocation.logicalBlockNum =
+					li->extLocation.logicalBlockNum +
+					((li->extLength &
+						UDF_EXTENT_LENGTH_MASK) >>
+						blocksize_bits);
+			} else {
+				li->extLength = lip1->extLength +
+					(((li->extLength &
+						UDF_EXTENT_LENGTH_MASK) +
+					 blocksize - 1) & ~(blocksize - 1));
+				if (*endnum > (i + 2))
+					memmove(&laarr[i + 1], &laarr[i + 2],
+						sizeof(struct long_ad) *
+						(*endnum - (i + 2)));
+				i--;
+				(*endnum)--;
+			}
+		} else if (((li->extLength >> 30) ==
+				(EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
+			   ((lip1->extLength >> 30) ==
+				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
+			udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
+					((li->extLength &
+					  UDF_EXTENT_LENGTH_MASK) +
+					 blocksize - 1) >> blocksize_bits);
+			li->extLocation.logicalBlockNum = 0;
+			li->extLocation.partitionReferenceNum = 0;
+
+			if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
+			     (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
+			     blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
+				lip1->extLength = (lip1->extLength -
+						   (li->extLength &
+						   UDF_EXTENT_LENGTH_MASK) +
+						   UDF_EXTENT_LENGTH_MASK) &
+						   ~(blocksize - 1);
+				li->extLength = (li->extLength &
+						 UDF_EXTENT_FLAG_MASK) +
+						(UDF_EXTENT_LENGTH_MASK + 1) -
+						blocksize;
+			} else {
+				li->extLength = lip1->extLength +
+					(((li->extLength &
+						UDF_EXTENT_LENGTH_MASK) +
+					  blocksize - 1) & ~(blocksize - 1));
+				if (*endnum > (i + 2))
+					memmove(&laarr[i + 1], &laarr[i + 2],
+						sizeof(struct long_ad) *
+						(*endnum - (i + 2)));
+				i--;
+				(*endnum)--;
+			}
+		} else if ((li->extLength >> 30) ==
+					(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
+			udf_free_blocks(inode->i_sb, inode,
+					&li->extLocation, 0,
+					((li->extLength &
+						UDF_EXTENT_LENGTH_MASK) +
+					 blocksize - 1) >> blocksize_bits);
+			li->extLocation.logicalBlockNum = 0;
+			li->extLocation.partitionReferenceNum = 0;
+			li->extLength = (li->extLength &
+						UDF_EXTENT_LENGTH_MASK) |
+						EXT_NOT_RECORDED_NOT_ALLOCATED;
+		}
+	}
+}
+
+static void udf_update_extents(struct inode *inode,
+			       struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
+			       int startnum, int endnum,
+			       struct extent_position *epos)
+{
+	int start = 0, i;
+	struct kernel_lb_addr tmploc;
+	uint32_t tmplen;
+
+	if (startnum > endnum) {
+		for (i = 0; i < (startnum - endnum); i++)
+			udf_delete_aext(inode, *epos, laarr[i].extLocation,
+					laarr[i].extLength);
+	} else if (startnum < endnum) {
+		for (i = 0; i < (endnum - startnum); i++) {
+			udf_insert_aext(inode, *epos, laarr[i].extLocation,
+					laarr[i].extLength);
+			udf_next_aext(inode, epos, &laarr[i].extLocation,
+				      &laarr[i].extLength, 1);
+			start++;
+		}
+	}
+
+	for (i = start; i < endnum; i++) {
+		udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
+		udf_write_aext(inode, epos, &laarr[i].extLocation,
+			       laarr[i].extLength, 1);
+	}
+}
+
+struct buffer_head *udf_bread(struct inode *inode, int block,
+			      int create, int *err)
+{
+	struct buffer_head *bh = NULL;
+
+	bh = udf_getblk(inode, block, create, err);
+	if (!bh)
+		return NULL;
+
+	if (buffer_uptodate(bh))
+		return bh;
+
+	ll_rw_block(READ, 1, &bh);
+
+	wait_on_buffer(bh);
+	if (buffer_uptodate(bh))
+		return bh;
+
+	brelse(bh);
+	*err = -EIO;
+	return NULL;
+}
+
+int udf_setsize(struct inode *inode, loff_t newsize)
+{
+	int err;
+	struct udf_inode_info *iinfo;
+	int bsize = 1 << inode->i_blkbits;
+
+	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+	      S_ISLNK(inode->i_mode)))
+		return -EINVAL;
+	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+		return -EPERM;
+
+	iinfo = UDF_I(inode);
+	if (newsize > inode->i_size) {
+		down_write(&iinfo->i_data_sem);
+		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			if (bsize <
+			    (udf_file_entry_alloc_offset(inode) + newsize)) {
+				err = udf_expand_file_adinicb(inode);
+				if (err)
+					return err;
+				down_write(&iinfo->i_data_sem);
+			} else {
+				iinfo->i_lenAlloc = newsize;
+				goto set_size;
+			}
+		}
+		err = udf_extend_file(inode, newsize);
+		if (err) {
+			up_write(&iinfo->i_data_sem);
+			return err;
+		}
+set_size:
+		truncate_setsize(inode, newsize);
+		up_write(&iinfo->i_data_sem);
+	} else {
+		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			down_write(&iinfo->i_data_sem);
+			udf_clear_extent_cache(inode);
+			memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
+			       0x00, bsize - newsize -
+			       udf_file_entry_alloc_offset(inode));
+			iinfo->i_lenAlloc = newsize;
+			truncate_setsize(inode, newsize);
+			up_write(&iinfo->i_data_sem);
+			goto update_time;
+		}
+		err = block_truncate_page(inode->i_mapping, newsize,
+					  udf_get_block);
+		if (err)
+			return err;
+		down_write(&iinfo->i_data_sem);
+		udf_clear_extent_cache(inode);
+		truncate_setsize(inode, newsize);
+		udf_truncate_extents(inode);
+		up_write(&iinfo->i_data_sem);
+	}
+update_time:
+	inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
+	if (IS_SYNC(inode))
+		udf_sync_inode(inode);
+	else
+		mark_inode_dirty(inode);
+	return 0;
+}
+
+/*
+ * Maximum length of linked list formed by ICB hierarchy. The chosen number is
+ * arbitrary - just that we hopefully don't limit any real use of rewritten
+ * inode on write-once media but avoid looping for too long on corrupted media.
+ */
+#define UDF_MAX_ICB_NESTING 1024
+
+static int udf_read_inode(struct inode *inode, bool hidden_inode)
+{
+	struct buffer_head *bh = NULL;
+	struct fileEntry *fe;
+	struct extendedFileEntry *efe;
+	uint16_t ident;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
+	struct kernel_lb_addr *iloc = &iinfo->i_location;
+	unsigned int link_count;
+	unsigned int indirections = 0;
+	int bs = inode->i_sb->s_blocksize;
+	int ret = -EIO;
+
+reread:
+	if (iloc->logicalBlockNum >=
+	    sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
+		udf_debug("block=%d, partition=%d out of range\n",
+			  iloc->logicalBlockNum, iloc->partitionReferenceNum);
+		return -EIO;
+	}
+
+	/*
+	 * Set defaults, but the inode is still incomplete!
+	 * Note: get_new_inode() sets the following on a new inode:
+	 *      i_sb = sb
+	 *      i_no = ino
+	 *      i_flags = sb->s_flags
+	 *      i_state = 0
+	 * clean_inode(): zero fills and sets
+	 *      i_count = 1
+	 *      i_nlink = 1
+	 *      i_op = NULL;
+	 */
+	bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
+	if (!bh) {
+		udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
+		return -EIO;
+	}
+
+	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
+	    ident != TAG_IDENT_USE) {
+		udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
+			inode->i_ino, ident);
+		goto out;
+	}
+
+	fe = (struct fileEntry *)bh->b_data;
+	efe = (struct extendedFileEntry *)bh->b_data;
+
+	if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
+		struct buffer_head *ibh;
+
+		ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
+		if (ident == TAG_IDENT_IE && ibh) {
+			struct kernel_lb_addr loc;
+			struct indirectEntry *ie;
+
+			ie = (struct indirectEntry *)ibh->b_data;
+			loc = lelb_to_cpu(ie->indirectICB.extLocation);
+
+			if (ie->indirectICB.extLength) {
+				brelse(ibh);
+				memcpy(&iinfo->i_location, &loc,
+				       sizeof(struct kernel_lb_addr));
+				if (++indirections > UDF_MAX_ICB_NESTING) {
+					udf_err(inode->i_sb,
+						"too many ICBs in ICB hierarchy"
+						" (max %d supported)\n",
+						UDF_MAX_ICB_NESTING);
+					goto out;
+				}
+				brelse(bh);
+				goto reread;
+			}
+		}
+		brelse(ibh);
+	} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
+		udf_err(inode->i_sb, "unsupported strategy type: %d\n",
+			le16_to_cpu(fe->icbTag.strategyType));
+		goto out;
+	}
+	if (fe->icbTag.strategyType == cpu_to_le16(4))
+		iinfo->i_strat4096 = 0;
+	else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
+		iinfo->i_strat4096 = 1;
+
+	iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
+							ICBTAG_FLAG_AD_MASK;
+	iinfo->i_unique = 0;
+	iinfo->i_lenEAttr = 0;
+	iinfo->i_lenExtents = 0;
+	iinfo->i_lenAlloc = 0;
+	iinfo->i_next_alloc_block = 0;
+	iinfo->i_next_alloc_goal = 0;
+	if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
+		iinfo->i_efe = 1;
+		iinfo->i_use = 0;
+		ret = udf_alloc_i_data(inode, bs -
+					sizeof(struct extendedFileEntry));
+		if (ret)
+			goto out;
+		memcpy(iinfo->i_ext.i_data,
+		       bh->b_data + sizeof(struct extendedFileEntry),
+		       bs - sizeof(struct extendedFileEntry));
+	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
+		iinfo->i_efe = 0;
+		iinfo->i_use = 0;
+		ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
+		if (ret)
+			goto out;
+		memcpy(iinfo->i_ext.i_data,
+		       bh->b_data + sizeof(struct fileEntry),
+		       bs - sizeof(struct fileEntry));
+	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
+		iinfo->i_efe = 0;
+		iinfo->i_use = 1;
+		iinfo->i_lenAlloc = le32_to_cpu(
+				((struct unallocSpaceEntry *)bh->b_data)->
+				 lengthAllocDescs);
+		ret = udf_alloc_i_data(inode, bs -
+					sizeof(struct unallocSpaceEntry));
+		if (ret)
+			goto out;
+		memcpy(iinfo->i_ext.i_data,
+		       bh->b_data + sizeof(struct unallocSpaceEntry),
+		       bs - sizeof(struct unallocSpaceEntry));
+		return 0;
+	}
+
+	ret = -EIO;
+	read_lock(&sbi->s_cred_lock);
+	i_uid_write(inode, le32_to_cpu(fe->uid));
+	if (!uid_valid(inode->i_uid) ||
+	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
+	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
+		inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
+
+	i_gid_write(inode, le32_to_cpu(fe->gid));
+	if (!gid_valid(inode->i_gid) ||
+	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
+	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
+		inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
+
+	if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
+			sbi->s_fmode != UDF_INVALID_MODE)
+		inode->i_mode = sbi->s_fmode;
+	else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
+			sbi->s_dmode != UDF_INVALID_MODE)
+		inode->i_mode = sbi->s_dmode;
+	else
+		inode->i_mode = udf_convert_permissions(fe);
+	inode->i_mode &= ~sbi->s_umask;
+	read_unlock(&sbi->s_cred_lock);
+
+	link_count = le16_to_cpu(fe->fileLinkCount);
+	if (!link_count) {
+		if (!hidden_inode) {
+			ret = -ESTALE;
+			goto out;
+		}
+		link_count = 1;
+	}
+	set_nlink(inode, link_count);
+
+	inode->i_size = le64_to_cpu(fe->informationLength);
+	iinfo->i_lenExtents = inode->i_size;
+
+	if (iinfo->i_efe == 0) {
+		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
+			(inode->i_sb->s_blocksize_bits - 9);
+
+		if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
+			inode->i_atime = sbi->s_record_time;
+
+		if (!udf_disk_stamp_to_time(&inode->i_mtime,
+					    fe->modificationTime))
+			inode->i_mtime = sbi->s_record_time;
+
+		if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
+			inode->i_ctime = sbi->s_record_time;
+
+		iinfo->i_unique = le64_to_cpu(fe->uniqueID);
+		iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
+		iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
+		iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
+	} else {
+		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
+		    (inode->i_sb->s_blocksize_bits - 9);
+
+		if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
+			inode->i_atime = sbi->s_record_time;
+
+		if (!udf_disk_stamp_to_time(&inode->i_mtime,
+					    efe->modificationTime))
+			inode->i_mtime = sbi->s_record_time;
+
+		if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
+			iinfo->i_crtime = sbi->s_record_time;
+
+		if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
+			inode->i_ctime = sbi->s_record_time;
+
+		iinfo->i_unique = le64_to_cpu(efe->uniqueID);
+		iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
+		iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
+		iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
+	}
+	inode->i_generation = iinfo->i_unique;
+
+	/*
+	 * Sanity check length of allocation descriptors and extended attrs to
+	 * avoid integer overflows
+	 */
+	if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
+		goto out;
+	/* Now do exact checks */
+	if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
+		goto out;
+	/* Sanity checks for files in ICB so that we don't get confused later */
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		/*
+		 * For file in ICB data is stored in allocation descriptor
+		 * so sizes should match
+		 */
+		if (iinfo->i_lenAlloc != inode->i_size)
+			goto out;
+		/* File in ICB has to fit in there... */
+		if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
+			goto out;
+	}
+
+	switch (fe->icbTag.fileType) {
+	case ICBTAG_FILE_TYPE_DIRECTORY:
+		inode->i_op = &udf_dir_inode_operations;
+		inode->i_fop = &udf_dir_operations;
+		inode->i_mode |= S_IFDIR;
+		inc_nlink(inode);
+		break;
+	case ICBTAG_FILE_TYPE_REALTIME:
+	case ICBTAG_FILE_TYPE_REGULAR:
+	case ICBTAG_FILE_TYPE_UNDEF:
+	case ICBTAG_FILE_TYPE_VAT20:
+		if (iinfo->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;
+		inode->i_mode |= S_IFREG;
+		break;
+	case ICBTAG_FILE_TYPE_BLOCK:
+		inode->i_mode |= S_IFBLK;
+		break;
+	case ICBTAG_FILE_TYPE_CHAR:
+		inode->i_mode |= S_IFCHR;
+		break;
+	case ICBTAG_FILE_TYPE_FIFO:
+		init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
+		break;
+	case ICBTAG_FILE_TYPE_SOCKET:
+		init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
+		break;
+	case ICBTAG_FILE_TYPE_SYMLINK:
+		inode->i_data.a_ops = &udf_symlink_aops;
+		inode->i_op = &udf_symlink_inode_operations;
+		inode->i_mode = S_IFLNK | S_IRWXUGO;
+		break;
+	case ICBTAG_FILE_TYPE_MAIN:
+		udf_debug("METADATA FILE-----\n");
+		break;
+	case ICBTAG_FILE_TYPE_MIRROR:
+		udf_debug("METADATA MIRROR FILE-----\n");
+		break;
+	case ICBTAG_FILE_TYPE_BITMAP:
+		udf_debug("METADATA BITMAP FILE-----\n");
+		break;
+	default:
+		udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
+			inode->i_ino, fe->icbTag.fileType);
+		goto out;
+	}
+	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+		struct deviceSpec *dsea =
+			(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
+		if (dsea) {
+			init_special_inode(inode, inode->i_mode,
+				MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
+				      le32_to_cpu(dsea->minorDeviceIdent)));
+			/* Developer ID ??? */
+		} else
+			goto out;
+	}
+	ret = 0;
+out:
+	brelse(bh);
+	return ret;
+}
+
+static int udf_alloc_i_data(struct inode *inode, size_t size)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
+
+	if (!iinfo->i_ext.i_data) {
+		udf_err(inode->i_sb, "(ino %ld) no free memory\n",
+			inode->i_ino);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static umode_t udf_convert_permissions(struct fileEntry *fe)
+{
+	umode_t mode;
+	uint32_t permissions;
+	uint32_t flags;
+
+	permissions = le32_to_cpu(fe->permissions);
+	flags = le16_to_cpu(fe->icbTag.flags);
+
+	mode =	((permissions) & S_IRWXO) |
+		((permissions >> 2) & S_IRWXG) |
+		((permissions >> 4) & S_IRWXU) |
+		((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
+		((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
+		((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
+
+	return mode;
+}
+
+int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+	return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
+}
+
+static int udf_sync_inode(struct inode *inode)
+{
+	return udf_update_inode(inode, 1);
+}
+
+static int udf_update_inode(struct inode *inode, int do_sync)
+{
+	struct buffer_head *bh = NULL;
+	struct fileEntry *fe;
+	struct extendedFileEntry *efe;
+	uint64_t lb_recorded;
+	uint32_t udfperms;
+	uint16_t icbflags;
+	uint16_t crclen;
+	int err = 0;
+	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
+	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	bh = udf_tgetblk(inode->i_sb,
+			udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
+	if (!bh) {
+		udf_debug("getblk failure\n");
+		return -EIO;
+	}
+
+	lock_buffer(bh);
+	memset(bh->b_data, 0, inode->i_sb->s_blocksize);
+	fe = (struct fileEntry *)bh->b_data;
+	efe = (struct extendedFileEntry *)bh->b_data;
+
+	if (iinfo->i_use) {
+		struct unallocSpaceEntry *use =
+			(struct unallocSpaceEntry *)bh->b_data;
+
+		use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+		memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
+		       iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
+					sizeof(struct unallocSpaceEntry));
+		use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
+		use->descTag.tagLocation =
+				cpu_to_le32(iinfo->i_location.logicalBlockNum);
+		crclen = sizeof(struct unallocSpaceEntry) +
+				iinfo->i_lenAlloc - sizeof(struct tag);
+		use->descTag.descCRCLength = cpu_to_le16(crclen);
+		use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
+							   sizeof(struct tag),
+							   crclen));
+		use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
+
+		goto out;
+	}
+
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
+		fe->uid = cpu_to_le32(-1);
+	else
+		fe->uid = cpu_to_le32(i_uid_read(inode));
+
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
+		fe->gid = cpu_to_le32(-1);
+	else
+		fe->gid = cpu_to_le32(i_gid_read(inode));
+
+	udfperms = ((inode->i_mode & S_IRWXO)) |
+		   ((inode->i_mode & S_IRWXG) << 2) |
+		   ((inode->i_mode & S_IRWXU) << 4);
+
+	udfperms |= (le32_to_cpu(fe->permissions) &
+		    (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
+		     FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
+		     FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
+	fe->permissions = cpu_to_le32(udfperms);
+
+	if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
+		fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
+	else
+		fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
+
+	fe->informationLength = cpu_to_le64(inode->i_size);
+
+	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+		struct regid *eid;
+		struct deviceSpec *dsea =
+			(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
+		if (!dsea) {
+			dsea = (struct deviceSpec *)
+				udf_add_extendedattr(inode,
+						     sizeof(struct deviceSpec) +
+						     sizeof(struct regid), 12, 0x3);
+			dsea->attrType = cpu_to_le32(12);
+			dsea->attrSubtype = 1;
+			dsea->attrLength = cpu_to_le32(
+						sizeof(struct deviceSpec) +
+						sizeof(struct regid));
+			dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
+		}
+		eid = (struct regid *)dsea->impUse;
+		memset(eid, 0, sizeof(struct regid));
+		strcpy(eid->ident, UDF_ID_DEVELOPER);
+		eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
+		eid->identSuffix[1] = UDF_OS_ID_LINUX;
+		dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
+		dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
+	}
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		lb_recorded = 0; /* No extents => no blocks! */
+	else
+		lb_recorded =
+			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
+			(blocksize_bits - 9);
+
+	if (iinfo->i_efe == 0) {
+		memcpy(bh->b_data + sizeof(struct fileEntry),
+		       iinfo->i_ext.i_data,
+		       inode->i_sb->s_blocksize - sizeof(struct fileEntry));
+		fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
+
+		udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
+		udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
+		udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
+		memset(&(fe->impIdent), 0, sizeof(struct regid));
+		strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
+		fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+		fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+		fe->uniqueID = cpu_to_le64(iinfo->i_unique);
+		fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
+		fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+		fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
+		fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
+		crclen = sizeof(struct fileEntry);
+	} else {
+		memcpy(bh->b_data + sizeof(struct extendedFileEntry),
+		       iinfo->i_ext.i_data,
+		       inode->i_sb->s_blocksize -
+					sizeof(struct extendedFileEntry));
+		efe->objectSize = cpu_to_le64(inode->i_size);
+		efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
+
+		if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
+		    (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
+		     iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
+			iinfo->i_crtime = inode->i_atime;
+
+		if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
+		    (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
+		     iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
+			iinfo->i_crtime = inode->i_mtime;
+
+		if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
+		    (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
+		     iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
+			iinfo->i_crtime = inode->i_ctime;
+
+		udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
+		udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
+		udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
+		udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
+
+		memset(&(efe->impIdent), 0, sizeof(struct regid));
+		strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
+		efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+		efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+		efe->uniqueID = cpu_to_le64(iinfo->i_unique);
+		efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
+		efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+		efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
+		efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
+		crclen = sizeof(struct extendedFileEntry);
+	}
+	if (iinfo->i_strat4096) {
+		fe->icbTag.strategyType = cpu_to_le16(4096);
+		fe->icbTag.strategyParameter = cpu_to_le16(1);
+		fe->icbTag.numEntries = cpu_to_le16(2);
+	} else {
+		fe->icbTag.strategyType = cpu_to_le16(4);
+		fe->icbTag.numEntries = cpu_to_le16(1);
+	}
+
+	if (S_ISDIR(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
+	else if (S_ISREG(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
+	else if (S_ISLNK(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
+	else if (S_ISBLK(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
+	else if (S_ISCHR(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
+	else if (S_ISFIFO(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
+	else if (S_ISSOCK(inode->i_mode))
+		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
+
+	icbflags =	iinfo->i_alloc_type |
+			((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
+			((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
+			((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
+			(le16_to_cpu(fe->icbTag.flags) &
+				~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
+				ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
+
+	fe->icbTag.flags = cpu_to_le16(icbflags);
+	if (sbi->s_udfrev >= 0x0200)
+		fe->descTag.descVersion = cpu_to_le16(3);
+	else
+		fe->descTag.descVersion = cpu_to_le16(2);
+	fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
+	fe->descTag.tagLocation = cpu_to_le32(
+					iinfo->i_location.logicalBlockNum);
+	crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
+	fe->descTag.descCRCLength = cpu_to_le16(crclen);
+	fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
+						  crclen));
+	fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
+
+out:
+	set_buffer_uptodate(bh);
+	unlock_buffer(bh);
+
+	/* write the data blocks */
+	mark_buffer_dirty(bh);
+	if (do_sync) {
+		sync_dirty_buffer(bh);
+		if (buffer_write_io_error(bh)) {
+			udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
+				 inode->i_ino);
+			err = -EIO;
+		}
+	}
+	brelse(bh);
+
+	return err;
+}
+
+struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
+			 bool hidden_inode)
+{
+	unsigned long block = udf_get_lb_pblock(sb, ino, 0);
+	struct inode *inode = iget_locked(sb, block);
+	int err;
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
+	err = udf_read_inode(inode, hidden_inode);
+	if (err < 0) {
+		iget_failed(inode);
+		return ERR_PTR(err);
+	}
+	unlock_new_inode(inode);
+
+	return inode;
+}
+
+int udf_add_aext(struct inode *inode, struct extent_position *epos,
+		 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+	int adsize;
+	struct short_ad *sad = NULL;
+	struct long_ad *lad = NULL;
+	struct allocExtDesc *aed;
+	uint8_t *ptr;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	if (!epos->bh)
+		ptr = iinfo->i_ext.i_data + epos->offset -
+			udf_file_entry_alloc_offset(inode) +
+			iinfo->i_lenEAttr;
+	else
+		ptr = epos->bh->b_data + epos->offset;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(struct short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(struct long_ad);
+	else
+		return -EIO;
+
+	if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
+		unsigned char *sptr, *dptr;
+		struct buffer_head *nbh;
+		int err, loffset;
+		struct kernel_lb_addr obloc = epos->block;
+
+		epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
+						obloc.partitionReferenceNum,
+						obloc.logicalBlockNum, &err);
+		if (!epos->block.logicalBlockNum)
+			return -ENOSPC;
+		nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
+								 &epos->block,
+								 0));
+		if (!nbh)
+			return -EIO;
+		lock_buffer(nbh);
+		memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
+		set_buffer_uptodate(nbh);
+		unlock_buffer(nbh);
+		mark_buffer_dirty_inode(nbh, inode);
+
+		aed = (struct allocExtDesc *)(nbh->b_data);
+		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
+			aed->previousAllocExtLocation =
+					cpu_to_le32(obloc.logicalBlockNum);
+		if (epos->offset + adsize > inode->i_sb->s_blocksize) {
+			loffset = epos->offset;
+			aed->lengthAllocDescs = cpu_to_le32(adsize);
+			sptr = ptr - adsize;
+			dptr = nbh->b_data + sizeof(struct allocExtDesc);
+			memcpy(dptr, sptr, adsize);
+			epos->offset = sizeof(struct allocExtDesc) + adsize;
+		} else {
+			loffset = epos->offset + adsize;
+			aed->lengthAllocDescs = cpu_to_le32(0);
+			sptr = ptr;
+			epos->offset = sizeof(struct allocExtDesc);
+
+			if (epos->bh) {
+				aed = (struct allocExtDesc *)epos->bh->b_data;
+				le32_add_cpu(&aed->lengthAllocDescs, adsize);
+			} else {
+				iinfo->i_lenAlloc += adsize;
+				mark_inode_dirty(inode);
+			}
+		}
+		if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
+			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
+				    epos->block.logicalBlockNum, sizeof(struct tag));
+		else
+			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
+				    epos->block.logicalBlockNum, sizeof(struct tag));
+		switch (iinfo->i_alloc_type) {
+		case ICBTAG_FLAG_AD_SHORT:
+			sad = (struct short_ad *)sptr;
+			sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
+						     inode->i_sb->s_blocksize);
+			sad->extPosition =
+				cpu_to_le32(epos->block.logicalBlockNum);
+			break;
+		case ICBTAG_FLAG_AD_LONG:
+			lad = (struct long_ad *)sptr;
+			lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
+						     inode->i_sb->s_blocksize);
+			lad->extLocation = cpu_to_lelb(epos->block);
+			memset(lad->impUse, 0x00, sizeof(lad->impUse));
+			break;
+		}
+		if (epos->bh) {
+			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+				udf_update_tag(epos->bh->b_data, loffset);
+			else
+				udf_update_tag(epos->bh->b_data,
+						sizeof(struct allocExtDesc));
+			mark_buffer_dirty_inode(epos->bh, inode);
+			brelse(epos->bh);
+		} else {
+			mark_inode_dirty(inode);
+		}
+		epos->bh = nbh;
+	}
+
+	udf_write_aext(inode, epos, eloc, elen, inc);
+
+	if (!epos->bh) {
+		iinfo->i_lenAlloc += adsize;
+		mark_inode_dirty(inode);
+	} else {
+		aed = (struct allocExtDesc *)epos->bh->b_data;
+		le32_add_cpu(&aed->lengthAllocDescs, adsize);
+		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+				UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+			udf_update_tag(epos->bh->b_data,
+					epos->offset + (inc ? 0 : adsize));
+		else
+			udf_update_tag(epos->bh->b_data,
+					sizeof(struct allocExtDesc));
+		mark_buffer_dirty_inode(epos->bh, inode);
+	}
+
+	return 0;
+}
+
+void udf_write_aext(struct inode *inode, struct extent_position *epos,
+		    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+{
+	int adsize;
+	uint8_t *ptr;
+	struct short_ad *sad;
+	struct long_ad *lad;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	if (!epos->bh)
+		ptr = iinfo->i_ext.i_data + epos->offset -
+			udf_file_entry_alloc_offset(inode) +
+			iinfo->i_lenEAttr;
+	else
+		ptr = epos->bh->b_data + epos->offset;
+
+	switch (iinfo->i_alloc_type) {
+	case ICBTAG_FLAG_AD_SHORT:
+		sad = (struct short_ad *)ptr;
+		sad->extLength = cpu_to_le32(elen);
+		sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
+		adsize = sizeof(struct short_ad);
+		break;
+	case ICBTAG_FLAG_AD_LONG:
+		lad = (struct long_ad *)ptr;
+		lad->extLength = cpu_to_le32(elen);
+		lad->extLocation = cpu_to_lelb(*eloc);
+		memset(lad->impUse, 0x00, sizeof(lad->impUse));
+		adsize = sizeof(struct long_ad);
+		break;
+	default:
+		return;
+	}
+
+	if (epos->bh) {
+		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+		    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
+			struct allocExtDesc *aed =
+				(struct allocExtDesc *)epos->bh->b_data;
+			udf_update_tag(epos->bh->b_data,
+				       le32_to_cpu(aed->lengthAllocDescs) +
+				       sizeof(struct allocExtDesc));
+		}
+		mark_buffer_dirty_inode(epos->bh, inode);
+	} else {
+		mark_inode_dirty(inode);
+	}
+
+	if (inc)
+		epos->offset += adsize;
+}
+
+int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
+		     struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
+{
+	int8_t etype;
+
+	while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
+	       (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
+		int block;
+		epos->block = *eloc;
+		epos->offset = sizeof(struct allocExtDesc);
+		brelse(epos->bh);
+		block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
+		epos->bh = udf_tread(inode->i_sb, block);
+		if (!epos->bh) {
+			udf_debug("reading block %d failed!\n", block);
+			return -1;
+		}
+	}
+
+	return etype;
+}
+
+int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
+			struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
+{
+	int alen;
+	int8_t etype;
+	uint8_t *ptr;
+	struct short_ad *sad;
+	struct long_ad *lad;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	if (!epos->bh) {
+		if (!epos->offset)
+			epos->offset = udf_file_entry_alloc_offset(inode);
+		ptr = iinfo->i_ext.i_data + epos->offset -
+			udf_file_entry_alloc_offset(inode) +
+			iinfo->i_lenEAttr;
+		alen = udf_file_entry_alloc_offset(inode) +
+							iinfo->i_lenAlloc;
+	} else {
+		if (!epos->offset)
+			epos->offset = sizeof(struct allocExtDesc);
+		ptr = epos->bh->b_data + epos->offset;
+		alen = sizeof(struct allocExtDesc) +
+			le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
+							lengthAllocDescs);
+	}
+
+	switch (iinfo->i_alloc_type) {
+	case ICBTAG_FLAG_AD_SHORT:
+		sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
+		if (!sad)
+			return -1;
+		etype = le32_to_cpu(sad->extLength) >> 30;
+		eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
+		eloc->partitionReferenceNum =
+				iinfo->i_location.partitionReferenceNum;
+		*elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
+		break;
+	case ICBTAG_FLAG_AD_LONG:
+		lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
+		if (!lad)
+			return -1;
+		etype = le32_to_cpu(lad->extLength) >> 30;
+		*eloc = lelb_to_cpu(lad->extLocation);
+		*elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
+		break;
+	default:
+		udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
+		return -1;
+	}
+
+	return etype;
+}
+
+static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
+			      struct kernel_lb_addr neloc, uint32_t nelen)
+{
+	struct kernel_lb_addr oeloc;
+	uint32_t oelen;
+	int8_t etype;
+
+	if (epos.bh)
+		get_bh(epos.bh);
+
+	while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
+		udf_write_aext(inode, &epos, &neloc, nelen, 1);
+		neloc = oeloc;
+		nelen = (etype << 30) | oelen;
+	}
+	udf_add_aext(inode, &epos, &neloc, nelen, 1);
+	brelse(epos.bh);
+
+	return (nelen >> 30);
+}
+
+int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
+		       struct kernel_lb_addr eloc, uint32_t elen)
+{
+	struct extent_position oepos;
+	int adsize;
+	int8_t etype;
+	struct allocExtDesc *aed;
+	struct udf_inode_info *iinfo;
+
+	if (epos.bh) {
+		get_bh(epos.bh);
+		get_bh(epos.bh);
+	}
+
+	iinfo = UDF_I(inode);
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(struct short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(struct long_ad);
+	else
+		adsize = 0;
+
+	oepos = epos;
+	if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
+		return -1;
+
+	while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
+		udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
+		if (oepos.bh != epos.bh) {
+			oepos.block = epos.block;
+			brelse(oepos.bh);
+			get_bh(epos.bh);
+			oepos.bh = epos.bh;
+			oepos.offset = epos.offset - adsize;
+		}
+	}
+	memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
+	elen = 0;
+
+	if (epos.bh != oepos.bh) {
+		udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
+		udf_write_aext(inode, &oepos, &eloc, elen, 1);
+		udf_write_aext(inode, &oepos, &eloc, elen, 1);
+		if (!oepos.bh) {
+			iinfo->i_lenAlloc -= (adsize * 2);
+			mark_inode_dirty(inode);
+		} else {
+			aed = (struct allocExtDesc *)oepos.bh->b_data;
+			le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
+			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+				udf_update_tag(oepos.bh->b_data,
+						oepos.offset - (2 * adsize));
+			else
+				udf_update_tag(oepos.bh->b_data,
+						sizeof(struct allocExtDesc));
+			mark_buffer_dirty_inode(oepos.bh, inode);
+		}
+	} else {
+		udf_write_aext(inode, &oepos, &eloc, elen, 1);
+		if (!oepos.bh) {
+			iinfo->i_lenAlloc -= adsize;
+			mark_inode_dirty(inode);
+		} else {
+			aed = (struct allocExtDesc *)oepos.bh->b_data;
+			le32_add_cpu(&aed->lengthAllocDescs, -adsize);
+			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
+			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
+				udf_update_tag(oepos.bh->b_data,
+						epos.offset - adsize);
+			else
+				udf_update_tag(oepos.bh->b_data,
+						sizeof(struct allocExtDesc));
+			mark_buffer_dirty_inode(oepos.bh, inode);
+		}
+	}
+
+	brelse(epos.bh);
+	brelse(oepos.bh);
+
+	return (elen >> 30);
+}
+
+int8_t inode_bmap(struct inode *inode, sector_t block,
+		  struct extent_position *pos, struct kernel_lb_addr *eloc,
+		  uint32_t *elen, sector_t *offset)
+{
+	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
+	loff_t lbcount = 0, bcount =
+	    (loff_t) block << blocksize_bits;
+	int8_t etype;
+	struct udf_inode_info *iinfo;
+
+	iinfo = UDF_I(inode);
+	if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
+		pos->offset = 0;
+		pos->block = iinfo->i_location;
+		pos->bh = NULL;
+	}
+	*elen = 0;
+	do {
+		etype = udf_next_aext(inode, pos, eloc, elen, 1);
+		if (etype == -1) {
+			*offset = (bcount - lbcount) >> blocksize_bits;
+			iinfo->i_lenExtents = lbcount;
+			return -1;
+		}
+		lbcount += *elen;
+	} while (lbcount <= bcount);
+	/* update extent cache */
+	udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
+	*offset = (bcount + *elen - lbcount) >> blocksize_bits;
+
+	return etype;
+}
+
+long udf_block_map(struct inode *inode, sector_t block)
+{
+	struct kernel_lb_addr eloc;
+	uint32_t elen;
+	sector_t offset;
+	struct extent_position epos = {};
+	int ret;
+
+	down_read(&UDF_I(inode)->i_data_sem);
+
+	if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
+						(EXT_RECORDED_ALLOCATED >> 30))
+		ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
+	else
+		ret = 0;
+
+	up_read(&UDF_I(inode)->i_data_sem);
+	brelse(epos.bh);
+
+	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
+		return udf_fixed_to_variable(ret);
+	else
+		return ret;
+}