fs/udf/inode.c



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/*
 * 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/smp_lock.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/crc-itu-t.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 mode_t udf_convert_permissions(struct fileEntry *);
static int udf_update_inode(struct inode *, int);
static void udf_fill_inode(struct inode *, struct buffer_head *);
static int udf_alloc_i_data(struct inode *inode, size_t size);
static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
					sector_t *, int *);
static int8_t udf_insert_aext(struct inode *, struct extent_position,
			      kernel_lb_addr, uint32_t);
static void udf_split_extents(struct inode *, int *, int, int,
			      kernel_long_ad[EXTENT_MERGE_SIZE], int *);
static void udf_prealloc_extents(struct inode *, int, int,
				 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
static void udf_merge_extents(struct inode *,
			      kernel_long_ad[EXTENT_MERGE_SIZE], int *);
static void udf_update_extents(struct inode *,
			       kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
			       struct extent_position *);
static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);


void udf_delete_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);

	if (is_bad_inode(inode))
		goto no_delete;

	inode->i_size = 0;
	udf_truncate(inode);
	lock_kernel();

	udf_update_inode(inode, IS_SYNC(inode));
	udf_free_inode(inode);

	unlock_kernel();
	return;

no_delete:
	clear_inode(inode);
}

/*
 * If we are going to release inode from memory, we discard preallocation and
 * truncate last inode extent to proper length. We could use drop_inode() but
 * it's called under inode_lock and thus we cannot mark inode dirty there.  We
 * use clear_inode() but we have to make sure to write inode as it's not written
 * automatically.
 */
void udf_clear_inode(struct inode *inode)
{
	struct udf_inode_info *iinfo;
	if (!(inode->i_sb->s_flags & MS_RDONLY)) {
		lock_kernel();
		/* Discard preallocation for directories, symlinks, etc. */
		udf_discard_prealloc(inode);
		udf_truncate_tail_extent(inode);
		unlock_kernel();
		write_inode_now(inode, 0);
	}
	iinfo = UDF_I(inode);
	kfree(iinfo->i_ext.i_data);
	iinfo->i_ext.i_data = NULL;
}

static int udf_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, udf_get_block, wbc);
}

static int udf_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page, 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)
{
	*pagep = NULL;
	return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				udf_get_block);
}

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,
	.writepage	= udf_writepage,
	.sync_page	= block_sync_page,
	.write_begin		= udf_write_begin,
	.write_end		= generic_write_end,
	.bmap		= udf_bmap,
};

void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
{
	struct page *page;
	char *kaddr;
	struct udf_inode_info *iinfo = UDF_I(inode);
	struct writeback_control udf_wbc = {
		.sync_mode = WB_SYNC_NONE,
		.nr_to_write = 1,
	};

	/* from now on we have normal address_space methods */
	inode->i_data.a_ops = &udf_aops;

	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;
		mark_inode_dirty(inode);
		return;
	}

	page = grab_cache_page(inode->i_mapping, 0);
	BUG_ON(!PageLocked(page));

	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);
	}
	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;

	inode->i_data.a_ops->writepage(page, &udf_wbc);
	page_cache_release(page);

	mark_inode_dirty(inode);
}

struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
					   int *err)
{
	int newblock;
	struct buffer_head *dbh = NULL;
	kernel_lb_addr eloc;
	uint32_t elen;
	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;
	elen = inode->i_sb->s_blocksize;
	iinfo->i_lenExtents = elen;
	epos.bh = NULL;
	epos.block = iinfo->i_location;
	epos.offset = udf_file_entry_alloc_offset(inode);
	udf_add_aext(inode, &epos, eloc, elen, 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;
	struct buffer_head *bh;
	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;
	bh = NULL;

	lock_kernel();

	iinfo = UDF_I(inode);
	if (block == iinfo->i_next_alloc_block + 1) {
		iinfo->i_next_alloc_block++;
		iinfo->i_next_alloc_goal++;
	}

	err = 0;

	bh = inode_getblk(inode, block, &err, &phys, &new);
	BUG_ON(bh);
	if (err)
		goto abort;
	BUG_ON(!phys);

	if (new)
		set_buffer_new(bh_result);
	map_bh(bh_result, inode->i_sb, phys);

abort:
	unlock_kernel();
	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 */
int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
		    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;
	kernel_lb_addr prealloc_loc = {};
	int prealloc_len = 0;
	struct udf_inode_info *iinfo;

	/* 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;
		if (udf_add_aext(inode, last_pos, last_ext->extLocation,
				 last_ext->extLength, 1) == -1)
			return -1;
		count++;
	}
	if (blocks) {
		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
			(blocks << sb->s_blocksize_bits);
		if (udf_add_aext(inode, last_pos, last_ext->extLocation,
				 last_ext->extLength, 1) == -1)
			return -1;
		count++;
	}

out:
	/* Do we have some preallocated blocks saved? */
	if (prealloc_len) {
		if (udf_add_aext(inode, last_pos, prealloc_loc,
				 prealloc_len, 1) == -1)
			return -1;
		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(short_ad);
	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
		last_pos->offset -= sizeof(long_ad);
	else
		return -1;

	return count;
}

static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
					int *err, sector_t *phys, int *new)
{
	static sector_t last_block;
	struct buffer_head *result = NULL;
	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;
	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;

	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));
			etype = 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);
		*phys = newblock;
		return NULL;
	}

	last_block = block;
	/* Are we beyond EOF? */
	if (etype == -1) {
		int ret;

		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(kernel_lb_addr));
			laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
			/* Will udf_extend_file() create real extent from
			   a fake one? */
			startnum = (offset > 0);
		}
		/* Create extents for the hole between EOF and offset */
		ret = udf_extend_file(inode, &prev_epos, laarr, offset);
		if (ret == -1) {
			brelse(prev_epos.bh);
			brelse(cur_epos.bh);
			brelse(next_epos.bh);
			/* We don't really know the error here so we just make
			 * something up */
			*err = -ENOSPC;
			return NULL;
		}
		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(kernel_lb_addr));
			count++;
			endnum++;
		}
		endnum = c + 1;
		lastblock = 1;
	} else {
		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);
			*err = -ENOSPC;
			return NULL;
		}
		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
	/* preallocate blocks */
	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);

	newblock = udf_get_pblock(inode->i_sb, newblocknum,
				iinfo->i_location.partitionReferenceNum, 0);
	if (!newblock)
		return NULL;
	*phys = newblock;
	*err = 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 result;
}

static void udf_split_extents(struct inode *inode, int *c, int offset,
			      int newblocknum,
			      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,
				 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(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(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,
			      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++) {
		kernel_long_ad *li /*l[i]*/ = &laarr[i];
		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(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(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,
			       kernel_long_ad laarr[EXTENT_MERGE_SIZE],
			       int startnum, int endnum,
			       struct extent_position *epos)
{
	int start = 0, i;
	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;
}

void udf_truncate(struct inode *inode)
{
	int offset;
	int err;
	struct udf_inode_info *iinfo;

	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	      S_ISLNK(inode->i_mode)))
		return;
	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
		return;

	lock_kernel();
	iinfo = UDF_I(inode);
	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
		if (inode->i_sb->s_blocksize <
				(udf_file_entry_alloc_offset(inode) +
				 inode->i_size)) {
			udf_expand_file_adinicb(inode, inode->i_size, &err);
			if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
				inode->i_size = iinfo->i_lenAlloc;
				unlock_kernel();
				return;
			} else
				udf_truncate_extents(inode);
		} else {
			offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
			memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
				0x00, inode->i_sb->s_blocksize -
				offset - udf_file_entry_alloc_offset(inode));
			iinfo->i_lenAlloc = inode->i_size;
		}
	} else {
		block_truncate_page(inode->i_mapping, inode->i_size,
				    udf_get_block);
		udf_truncate_extents(inode);
	}

	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);
	unlock_kernel();
}

static void __udf_read_inode(struct inode *inode)
{
	struct buffer_head *bh = NULL;
	struct fileEntry *fe;
	uint16_t ident;
	struct udf_inode_info *iinfo = UDF_I(inode);

	/*
	 * 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, iinfo->i_location, 0, &ident);
	if (!bh) {
		printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
		       inode->i_ino);
		make_bad_inode(inode);
		return;
	}

	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
	    ident != TAG_IDENT_USE) {
		printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
				"failed ident=%d\n", inode->i_ino, ident);
		brelse(bh);
		make_bad_inode(inode);
		return;
	}

	fe = (struct fileEntry *)bh->b_data;

	if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
		struct buffer_head *ibh;

		ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
					&ident);
		if (ident == TAG_IDENT_IE && ibh) {
			struct buffer_head *nbh = NULL;
			kernel_lb_addr loc;
			struct indirectEntry *ie;

			ie = (struct indirectEntry *)ibh->b_data;
			loc = lelb_to_cpu(ie->indirectICB.extLocation);

			if (ie->indirectICB.extLength &&
				(nbh = udf_read_ptagged(inode->i_sb, loc, 0,
							&ident))) {
				if (ident == TAG_IDENT_FE ||
					ident == TAG_IDENT_EFE) {
					memcpy(&iinfo->i_location,
						&loc,
						sizeof(kernel_lb_addr));
					brelse(bh);
					brelse(ibh);
					brelse(nbh);
					__udf_read_inode(inode);
					return;
				}
				brelse(nbh);
			}
		}
		brelse(ibh);
	} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
		printk(KERN_ERR "udf: unsupported strategy type: %d\n",
		       le16_to_cpu(fe->icbTag.strategyType));
		brelse(bh);
		make_bad_inode(inode);
		return;
	}
	udf_fill_inode(inode, bh);

	brelse(bh);
}

static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
{
	struct fileEntry *fe;
	struct extendedFileEntry *efe;
	int offset;
	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
	struct udf_inode_info *iinfo = UDF_I(inode);

	fe = (struct fileEntry *)bh->b_data;
	efe = (struct extendedFileEntry *)bh->b_data;

	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;
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
					sizeof(struct extendedFileEntry))) {
			make_bad_inode(inode);
			return;
		}
		memcpy(iinfo->i_ext.i_data,
		       bh->b_data + sizeof(struct extendedFileEntry),
		       inode->i_sb->s_blocksize -
					sizeof(struct extendedFileEntry));
	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
		iinfo->i_efe = 0;
		iinfo->i_use = 0;
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
						sizeof(struct fileEntry))) {
			make_bad_inode(inode);
			return;
		}
		memcpy(iinfo->i_ext.i_data,
		       bh->b_data + sizeof(struct fileEntry),
		       inode->i_sb->s_blocksize - 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);
		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
					sizeof(struct unallocSpaceEntry))) {
			make_bad_inode(inode);
			return;
		}
		memcpy(iinfo->i_ext.i_data,
		       bh->b_data + sizeof(struct unallocSpaceEntry),
		       inode->i_sb->s_blocksize -
					sizeof(struct unallocSpaceEntry));
		return;
	}

	inode->i_uid = le32_to_cpu(fe->uid);
	if (inode->i_uid == -1 ||
	    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;

	inode->i_gid = le32_to_cpu(fe->gid);
	if (inode->i_gid == -1 ||
	    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;

	inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
	if (!inode->i_nlink)
		inode->i_nlink = 1;

	inode->i_size = le64_to_cpu(fe->informationLength);
	iinfo->i_lenExtents = inode->i_size;