inode.c 53.6 KB
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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 "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 *);
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static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
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	long *, int *);
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static int8_t udf_insert_aext(struct inode *, struct extent_position,
	kernel_lb_addr, uint32_t);
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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,
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	struct extent_position *);
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static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);

/*
 * udf_delete_inode
 *
 * PURPOSE
 *	Clean-up before the specified inode is destroyed.
 *
 * DESCRIPTION
 *	This routine is called when the kernel destroys an inode structure
 *	ie. when iput() finds i_count == 0.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 *
 *  Called at the last iput() if i_nlink is zero.
 */
void udf_delete_inode(struct inode * inode)
{
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	truncate_inode_pages(&inode->i_data, 0);

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	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);
}

void udf_clear_inode(struct inode *inode)
{
	if (!(inode->i_sb->s_flags & MS_RDONLY)) {
		lock_kernel();
		udf_discard_prealloc(inode);
		unlock_kernel();
	}

	kfree(UDF_I_DATA(inode));
	UDF_I_DATA(inode) = 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_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
{
	return block_prepare_write(page, from, to, udf_get_block);
}

static sector_t udf_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping,block,udf_get_block);
}

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const struct address_space_operations udf_aops = {
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	.readpage		= udf_readpage,
	.writepage		= udf_writepage,
	.sync_page		= block_sync_page,
	.prepare_write		= udf_prepare_write,
	.commit_write		= generic_commit_write,
	.bmap			= udf_bmap,
};

void udf_expand_file_adinicb(struct inode * inode, int newsize, int * err)
{
	struct page *page;
	char *kaddr;
	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 (!UDF_I_LENALLOC(inode))
	{
		if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
			UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
		else
			UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
		mark_inode_dirty(inode);
		return;
	}

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

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	if (!PageUptodate(page))
	{
		kaddr = kmap(page);
		memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
			PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
		memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
			UDF_I_LENALLOC(inode));
		flush_dcache_page(page);
		SetPageUptodate(page);
		kunmap(page);
	}
	memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
		UDF_I_LENALLOC(inode));
	UDF_I_LENALLOC(inode) = 0;
	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
		UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
	else
		UDF_I_ALLOCTYPE(inode) = 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;
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	struct buffer_head *dbh = NULL;
	kernel_lb_addr eloc;
	uint32_t elen;
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	uint8_t alloctype;
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	struct extent_position epos;
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	struct udf_fileident_bh sfibh, dfibh;
	loff_t f_pos = udf_ext0_offset(inode) >> 2;
	int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
	struct fileIdentDesc cfi, *sfi, *dfi;

	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)
	{
		UDF_I_ALLOCTYPE(inode) = alloctype;
		mark_inode_dirty(inode);
		return NULL;
	}

	/* alloc block, and copy data to it */
	*block = udf_new_block(inode->i_sb, inode,
		UDF_I_LOCATION(inode).partitionReferenceNum,
		UDF_I_LOCATION(inode).logicalBlockNum, err);

	if (!(*block))
		return NULL;
	newblock = udf_get_pblock(inode->i_sb, *block,
		UDF_I_LOCATION(inode).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) >> 2)) << 2;
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	sfibh.sbh = sfibh.ebh = NULL;
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	dfibh.soffset = dfibh.eoffset = 0;
	dfibh.sbh = dfibh.ebh = dbh;
	while ( (f_pos < size) )
	{
		UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
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		sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL);
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		if (!sfi)
		{
			udf_release_data(dbh);
			return NULL;
		}
		UDF_I_ALLOCTYPE(inode) = 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)))
		{
			UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
			udf_release_data(dbh);
			return NULL;
		}
	}
	mark_buffer_dirty_inode(dbh, inode);

	memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
	UDF_I_LENALLOC(inode) = 0;
	eloc.logicalBlockNum = *block;
	eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
	elen = inode->i_size;
	UDF_I_LENEXTENTS(inode) = elen;
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	epos.bh = NULL;
	epos.block = UDF_I_LOCATION(inode);
	epos.offset = udf_file_entry_alloc_offset(inode);
	udf_add_aext(inode, &epos, eloc, elen, 0);
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	/* UniqueID stuff */

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	udf_release_data(epos.bh);
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	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;
	unsigned long phys;

	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();

	if (block < 0)
		goto abort_negative;

	if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1)
	{
		UDF_I_NEXT_ALLOC_BLOCK(inode) ++;
		UDF_I_NEXT_ALLOC_GOAL(inode) ++;
	}

	err = 0;

	bh = inode_getblk(inode, block, &err, &phys, &new);
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	BUG_ON(bh);
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	if (err)
		goto abort;
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	BUG_ON(!phys);
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	if (new)
		set_buffer_new(bh_result);
	map_bh(bh_result, inode->i_sb, phys);
abort:
	unlock_kernel();
	return err;

abort_negative:
	udf_warning(inode->i_sb, "udf_get_block", "block < 0");
	goto abort;
}

static struct buffer_head *
udf_getblk(struct inode *inode, long block, int create, int *err)
{
	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))
	{
		struct buffer_head *bh;
		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;
}

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static struct buffer_head * inode_getblk(struct inode * inode, sector_t block,
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	int *err, long *phys, int *new)
{
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	struct buffer_head *result = NULL;
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	kernel_long_ad laarr[EXTENT_MERGE_SIZE];
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	struct extent_position prev_epos, cur_epos, next_epos;
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	int count = 0, startnum = 0, endnum = 0;
	uint32_t elen = 0;
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	kernel_lb_addr eloc;
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	int c = 1;
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	loff_t lbcount = 0, b_off = 0;
	uint32_t newblocknum, newblock;
	sector_t offset = 0;
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	int8_t etype;
	int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
	char lastblock = 0;

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	prev_epos.offset = udf_file_entry_alloc_offset(inode);
	prev_epos.block = UDF_I_LOCATION(inode);
	prev_epos.bh = NULL;
	cur_epos = next_epos = prev_epos;
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	b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
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	/* 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
	{
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		if (prev_epos.bh != cur_epos.bh)
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		{
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			udf_release_data(prev_epos.bh);
			atomic_inc(&cur_epos.bh->b_count);
			prev_epos.bh = cur_epos.bh;
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		}
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		if (cur_epos.bh != next_epos.bh)
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		{
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			udf_release_data(cur_epos.bh);
			atomic_inc(&next_epos.bh->b_count);
			cur_epos.bh = next_epos.bh;
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		}

		lbcount += elen;

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		prev_epos.block = cur_epos.block;
		cur_epos.block = next_epos.block;
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		prev_epos.offset = cur_epos.offset;
		cur_epos.offset = next_epos.offset;
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		if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1)) == -1)
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			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;

	/* 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));
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			etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
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		}
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		udf_release_data(prev_epos.bh);
		udf_release_data(cur_epos.bh);
		udf_release_data(next_epos.bh);
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		newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
		*phys = newblock;
		return NULL;
	}

	if (etype == -1)
	{
		endnum = startnum = ((count > 1) ? 1 : count);
		if (laarr[c].extLength & (inode->i_sb->s_blocksize - 1))
		{
			laarr[c].extLength =
				(laarr[c].extLength & UDF_EXTENT_FLAG_MASK) |
				(((laarr[c].extLength & UDF_EXTENT_LENGTH_MASK) +
					inode->i_sb->s_blocksize - 1) &
				~(inode->i_sb->s_blocksize - 1));
			UDF_I_LENEXTENTS(inode) =
				(UDF_I_LENEXTENTS(inode) + inode->i_sb->s_blocksize - 1) &
					~(inode->i_sb->s_blocksize - 1);
		}
		c = !c;
		laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
			((offset + 1) << inode->i_sb->s_blocksize_bits);
		memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
		count ++;
		endnum ++;
		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 a extent, read the next extent */
	if (etype != -1)
	{
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		if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0)) != -1)
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		{
			laarr[c+1].extLength = (etype << 30) | elen;
			laarr[c+1].extLocation = eloc;
			count ++;
			startnum ++;
			endnum ++;
		}
		else
			lastblock = 1;
	}
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	udf_release_data(cur_epos.bh);
	udf_release_data(next_epos.bh);
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	/* 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 (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
			goal = UDF_I_NEXT_ALLOC_GOAL(inode);

		if (!goal)
		{
			if (!(goal = pgoal))
				goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
		}

		if (!(newblocknum = udf_new_block(inode->i_sb, inode,
			UDF_I_LOCATION(inode).partitionReferenceNum, goal, err)))
		{
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			udf_release_data(prev_epos.bh);
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			*err = -ENOSPC;
			return NULL;
		}
		UDF_I_LENEXTENTS(inode) += 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 */
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	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
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	udf_release_data(prev_epos.bh);
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	if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
		UDF_I_LOCATION(inode).partitionReferenceNum, 0)))
	{
		return NULL;
	}
	*phys = newblock;
	*err = 0;
	*new = 1;
	UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
	UDF_I_NEXT_ALLOC_GOAL(inode) = 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)
{
	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) +
			inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_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 << inode->i_sb->s_blocksize_bits);
				laarr[curr].extLocation.logicalBlockNum = 0;
				laarr[curr].extLocation.partitionReferenceNum = 0;
			}
			else
				laarr[curr].extLength = (etype << 30) |
					(offset << inode->i_sb->s_blocksize_bits);
			curr ++;
			(*c) ++;
			(*endnum) ++;
		}
		
		laarr[curr].extLocation.logicalBlockNum = newblocknum;
		if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
			laarr[curr].extLocation.partitionReferenceNum =
				UDF_I_LOCATION(inode).partitionReferenceNum;
		laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
			inode->i_sb->s_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)) << inode->i_sb->s_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_LENEXTENTS(inode) += 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;

	for (i=0; i<(*endnum-1); i++)
	{
		if ((laarr[i].extLength >> 30) == (laarr[i+1].extLength >> 30))
		{
			if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
				((laarr[i+1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
				(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
				inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits)))
			{
				if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
					(laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
					inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
				{
					laarr[i+1].extLength = (laarr[i+1].extLength -
						(laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
						UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
					laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
						(UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
					laarr[i+1].extLocation.logicalBlockNum =
						laarr[i].extLocation.logicalBlockNum +
						((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
							inode->i_sb->s_blocksize_bits);
				}
				else
				{
					laarr[i].extLength = laarr[i+1].extLength +
						(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
						inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
					if (*endnum > (i+2))
						memmove(&laarr[i+1], &laarr[i+2],
							sizeof(long_ad) * (*endnum - (i+2)));
					i --;
					(*endnum) --;
				}
			}
		}
		else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
			((laarr[i+1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)))
		{
			udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
				((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
				inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
			laarr[i].extLocation.logicalBlockNum = 0;
			laarr[i].extLocation.partitionReferenceNum = 0;

			if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
				(laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
				inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
			{
				laarr[i+1].extLength = (laarr[i+1].extLength -
					(laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
					UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
				laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
					(UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
			}
			else
			{
				laarr[i].extLength = laarr[i+1].extLength +
					(((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
					inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
				if (*endnum > (i+2))
					memmove(&laarr[i+1], &laarr[i+2],
						sizeof(long_ad) * (*endnum - (i+2)));
				i --;
				(*endnum) --;
			}
		}
		else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
		{
			udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
				((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
			       inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
			laarr[i].extLocation.logicalBlockNum = 0;
			laarr[i].extLocation.partitionReferenceNum = 0;
			laarr[i].extLength = (laarr[i].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,
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	struct extent_position *epos)
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{
	int start = 0, i;
	kernel_lb_addr tmploc;
	uint32_t tmplen;

	if (startnum > endnum)
	{
		for (i=0; i<(startnum-endnum); i++)
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			udf_delete_aext(inode, *epos, laarr[i].extLocation,
				laarr[i].extLength);
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	}
	else if (startnum < endnum)
	{
		for (i=0; i<(endnum-startnum); i++)
		{
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			udf_insert_aext(inode, *epos, laarr[i].extLocation,
				laarr[i].extLength);
			udf_next_aext(inode, epos, &laarr[i].extLocation,
				&laarr[i].extLength, 1);
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			start ++;
		}
	}

	for (i=start; i<endnum; i++)
	{
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		udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
		udf_write_aext(inode, epos, laarr[i].extLocation,
			laarr[i].extLength, 1);
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	}
}

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;

	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();
	if (UDF_I_ALLOCTYPE(inode) == 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 (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
			{
				inode->i_size = UDF_I_LENALLOC(inode);
				unlock_kernel();
				return;
			}
			else
				udf_truncate_extents(inode);
		}
		else
		{
			offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
			memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
			UDF_I_LENALLOC(inode) = 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;

	/*
	 * 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, UDF_I_LOCATION(inode), 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);
		udf_release_data(bh);
		make_bad_inode(inode);
		return;
	}

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

	if (le16_to_cpu(fe->icbTag.strategyType) == 4096)
	{
		struct buffer_head *ibh = NULL, *nbh = NULL;
		struct indirectEntry *ie;

		ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
		if (ident == TAG_IDENT_IE)
		{
			if (ibh)
			{
				kernel_lb_addr loc;
				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(&UDF_I_LOCATION(inode), &loc, sizeof(kernel_lb_addr));
						udf_release_data(bh);
						udf_release_data(ibh);
						udf_release_data(nbh);
						__udf_read_inode(inode);
						return;
					}
					else
					{
						udf_release_data(nbh);
						udf_release_data(ibh);
					}
				}
				else
					udf_release_data(ibh);
			}
		}
		else
			udf_release_data(ibh);
	}
	else if (le16_to_cpu(fe->icbTag.strategyType) != 4)
	{
		printk(KERN_ERR "udf: unsupported strategy type: %d\n",
			le16_to_cpu(fe->icbTag.strategyType));
		udf_release_data(bh);
		make_bad_inode(inode);
		return;
	}
	udf_fill_inode(inode, bh);
	udf_release_data(bh);
}

static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
{
	struct fileEntry *fe;
	struct extendedFileEntry *efe;
	time_t convtime;
	long convtime_usec;
	int offset;

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

	if (le16_to_cpu(fe->icbTag.strategyType) == 4)
		UDF_I_STRAT4096(inode) = 0;
	else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
		UDF_I_STRAT4096(inode) = 1;

	UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
	UDF_I_UNIQUE(inode) = 0;
	UDF_I_LENEATTR(inode) = 0;
	UDF_I_LENEXTENTS(inode) = 0;
	UDF_I_LENALLOC(inode) = 0;
	UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
	UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
	if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE)
	{
		UDF_I_EFE(inode) = 1;
		UDF_I_USE(inode) = 0;
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
	}
	else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
	{
		UDF_I_EFE(inode) = 0;
		UDF_I_USE(inode) = 0;
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
	}
	else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
	{
		UDF_I_EFE(inode) = 0;
		UDF_I_USE(inode) = 1;
		UDF_I_LENALLOC(inode) =
			le32_to_cpu(
				((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
		UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
		memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
		return;
	}

	inode->i_uid = le32_to_cpu(fe->uid);
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	if (inode->i_uid == -1 || UDF_QUERY_FLAG(inode->i_sb,
					UDF_FLAG_UID_IGNORE))
		inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
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	inode->i_gid = le32_to_cpu(fe->gid);
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	if (inode->i_gid == -1 || UDF_QUERY_FLAG(inode->i_sb,
					UDF_FLAG_GID_IGNORE))
		inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
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	inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
	if (!inode->i_nlink)
		inode->i_nlink = 1;
	
	inode->i_size = le64_to_cpu(fe->informationLength);
	UDF_I_LENEXTENTS(inode) = inode->i_size;

	inode->i_mode = udf_convert_permissions(fe);
	inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;

	if (UDF_I_EFE(inode) == 0)
	{
		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
			(inode->i_sb->s_blocksize_bits - 9);

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->accessTime)) )
		{
			inode->i_atime.tv_sec = convtime;
			inode->i_atime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->modificationTime)) )
		{
			inode->i_mtime.tv_sec = convtime;
			inode->i_mtime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(fe->attrTime)) )
		{
			inode->i_ctime.tv_sec = convtime;
			inode->i_ctime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
		UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
		UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
		offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
	}
	else
	{
		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << 
			(inode->i_sb->s_blocksize_bits - 9);

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->accessTime)) )
		{
			inode->i_atime.tv_sec = convtime;
			inode->i_atime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->modificationTime)) )
		{
			inode->i_mtime.tv_sec = convtime;
			inode->i_mtime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->createTime)) )
		{
			UDF_I_CRTIME(inode).tv_sec = convtime;
			UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
		}
		else
		{
			UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
		}

		if ( udf_stamp_to_time(&convtime, &convtime_usec,
			lets_to_cpu(efe->attrTime)) )
		{
			inode->i_ctime.tv_sec = convtime;
			inode->i_ctime.tv_nsec = convtime_usec * 1000;
		}
		else
		{
			inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
		}

		UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
		UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
		UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
		offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
	}

	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;
1171
			inc_nlink(inode);
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			break;
		}
		case ICBTAG_FILE_TYPE_REALTIME:
		case ICBTAG_FILE_TYPE_REGULAR:
		case ICBTAG_FILE_TYPE_UNDEF:
		{
			if (UDF_I_ALLOCTYPE(inode) == 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 = &page_symlink_inode_operations;
			inode->i_mode = S_IFLNK|S_IRWXUGO;
			break;
		}
		default:
		{
			printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
				inode->i_ino, fe->icbTag.fileType);
			make_bad_inode(inode);
			return;
		}
	}
	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
		{
			make_bad_inode(inode);
		}
	}
}

static mode_t
udf_convert_permissions(struct fileEntry *fe)
{
	mode_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;
}

/*
 * udf_write_inode
 *
 * PURPOSE
 *	Write out the specified inode.
 *
 * DESCRIPTION
 *	This routine is called whenever an inode is synced.
 *	Currently this routine is just a placeholder.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */

int udf_write_inode(struct inode * inode, int sync)
{
	int ret;
	lock_kernel();
	ret = udf_update_inode(inode, sync);
	unlock_kernel();
	return ret;
}

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;
	uint32_t udfperms;
	uint16_t icbflags;
	uint16_t crclen;
	int i;
	kernel_timestamp cpu_time;
	int err = 0;

	bh = udf_tread(inode->i_sb,
		udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));

	if (!bh)
	{
		udf_debug("bread failure\n");
		return -EIO;
	}

	memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);

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

	if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
	{
		struct unallocSpaceEntry *use =
			(struct unallocSpaceEntry *)bh->b_data;

		use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
		crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) -
			sizeof(tag);
		use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
		use->descTag.descCRCLength = cpu_to_le16(crclen);
		use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));

		use->descTag.tagChecksum = 0;
		for (i=0; i<16; i++)
			if (i != 4)
				use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];

		mark_buffer_dirty(bh);
		udf_release_data(bh);
		return err;
	}

1341 1342
	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
		fe->uid = cpu_to_le32(-1);
1343
	else fe->uid = cpu_to_le32(inode->i_uid);
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	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
		fe->gid = cpu_to_le32(-1);
1347
	else fe->gid = cpu_to_le32(inode->i_gid);
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	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))
		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))
	{
		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(regid), 12, 0x3);
			dsea->attrType = cpu_to_le32(12);
			dsea->attrSubtype = 1;
			dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
				sizeof(regid));
			dsea->impUseLength = cpu_to_le32(sizeof(regid));
		}
		eid = (regid *)dsea->impUse;
		memset(eid, 0, sizeof(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 (UDF_I_EFE(inode) == 0)
	{
		memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
		fe->logicalBlocksRecorded = cpu_to_le64(
			(inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
			(inode->i_sb->s_blocksize_bits - 9));

		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
			fe->accessTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
			fe->modificationTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
			fe->attrTime = cpu_to_lets(cpu_time);
		memset(&(fe->impIdent), 0, sizeof(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(UDF_I_UNIQUE(inode));
		fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
		fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
		crclen = sizeof(struct fileEntry);
	}
	else
	{
		memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
		efe->objectSize = cpu_to_le64(inode->i_size);
		efe->logicalBlocksRecorded = cpu_to_le64(
			(inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
			(inode->i_sb->s_blocksize_bits - 9));

		if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_atime;
		}
		if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_mtime;
		}
		if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
			(UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
			 UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
		{
			UDF_I_CRTIME(inode) = inode->i_ctime;
		}

		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
			efe->accessTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
			efe->modificationTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
			efe->createTime = cpu_to_lets(cpu_time);
		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
			efe->attrTime = cpu_to_lets(cpu_time);

		memset(&(efe->impIdent), 0, sizeof(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(UDF_I_UNIQUE(inode));
		efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
		efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
		efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
		crclen = sizeof(struct extendedFileEntry);
	}
	if (UDF_I_STRAT4096(inode))
	{
		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 =	UDF_I_ALLOCTYPE(inode) |
			((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 (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
		fe->descTag.descVersion = cpu_to_le16(3);
	else
		fe->descTag.descVersion = cpu_to_le16(2);
	fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
	fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
	crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
	fe->descTag.descCRCLength = cpu_to_le16(crclen);
	fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));

	fe->descTag.tagChecksum = 0;
	for (i=0; i<16; i++)
		if (i != 4)
			fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];

	/* write the data blocks */
	mark_buffer_dirty(bh);
	if (do_sync)
	{
		sync_dirty_buffer(bh);
		if (buffer_req(bh) && !buffer_uptodate(bh))
		{
			printk("IO error syncing udf inode [%s:%08lx]\n",
				inode->i_sb->s_id, inode->i_ino);
			err = -EIO;
		}
	}
	udf_release_data(bh);
	return err;
}

struct inode *
udf_iget(struct super_block *sb, kernel_lb_addr ino)
{
	unsigned long block = udf_get_lb_pblock(sb, ino, 0);
	struct inode *inode = iget_locked(sb, block);

	if (!inode)
		return NULL;

	if (inode->i_state & I_NEW) {
		memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
		__udf_read_inode(inode);
		unlock_new_inode(inode);
	}

	if (is_bad_inode(inode))
		goto out_iput;

	if (ino.logicalBlockNum >= UDF_SB_PARTLEN(sb, ino.partitionReferenceNum)) {
		udf_debug("block=%d, partition=%d out of range\n",
			ino.logicalBlockNum, ino.partitionReferenceNum);
		make_bad_inode(inode);
		goto out_iput;
	}

	return inode;

 out_iput:
	iput(inode);
	return NULL;
}

J
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int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
	kernel_lb_addr eloc, uint32_t elen, int inc)
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{
	int adsize;
	short_ad *sad = NULL;
	long_ad *lad = NULL;
	struct allocExtDesc *aed;
	int8_t etype;
	uint8_t *ptr;

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	if (!epos->bh)
		ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
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	else
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		ptr = epos->bh->b_data + epos->offset;
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	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
		adsize = sizeof(short_ad);
	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
		adsize = sizeof(long_ad);
	else
		return -1;

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	if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize)
L
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	{
		char *sptr, *dptr;
		struct buffer_head *nbh;
		int err, loffset;
J
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		kernel_lb_addr obloc = epos->block;
L
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		if (!(epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
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			obloc.partitionReferenceNum, obloc.logicalBlockNum, &err)))
		{
			return -1;
		}
		if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
J
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1597
			epos->block, 0))))
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		{
			return -1;
		}
		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);
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1610
		if (epos->offset + adsize > inode->i_sb->s_blocksize)
L
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1611
		{
J
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			loffset = epos->offset;
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			aed->lengthAllocDescs = cpu_to_le32(adsize);
			sptr = ptr - adsize;
			dptr = nbh->b_data + sizeof(struct allocExtDesc);
			memcpy(dptr, sptr, adsize);
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			epos->offset = sizeof(struct allocExtDesc) + adsize;
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		}
		else
		{
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			loffset = epos->offset + adsize;
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			aed->lengthAllocDescs = cpu_to_le32(0);
			sptr = ptr;
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			epos->offset = sizeof(struct allocExtDesc);
L
Linus Torvalds 已提交
1625

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1626
			if (epos->bh)
L
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			{
J
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				aed = (struct allocExtDesc *)epos->bh->b_data;
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				aed->lengthAllocDescs =
					cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
			}
			else
			{
				UDF_I_LENALLOC(inode) += adsize;
				mark_inode_dirty(inode);
			}
		}
		if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
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				epos->block.logicalBlockNum, sizeof(tag));
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		else
			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
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				epos->block.logicalBlockNum, sizeof(tag));
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		switch (UDF_I_ALLOCTYPE(inode))
		{
			case ICBTAG_FLAG_AD_SHORT:
			{
				sad = (short_ad *)sptr;
				sad->extLength = cpu_to_le32(
					EXT_NEXT_EXTENT_ALLOCDECS |
					inode->i_sb->s_blocksize);
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				sad->extPosition = cpu_to_le32(epos->block.logicalBlockNum);
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				break;
			}
			case ICBTAG_FLAG_AD_LONG:
			{
				lad = (long_ad *)sptr;
				lad->extLength = cpu_to_le32(
					EXT_NEXT_EXTENT_ALLOCDECS |
					inode->i_sb->s_blocksize);
J
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				lad->extLocation = cpu_to_lelb(epos->block);
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				memset(lad->impUse, 0x00, sizeof(lad->impUse));
				break;
			}
		}
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		if (epos->bh)
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		{
			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
J
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				udf_update_tag(epos->bh->b_data, loffset);
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			else
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				udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
			mark_buffer_dirty_inode(epos->bh, inode);
			udf_release_data(epos->bh);
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		}
		else
			mark_inode_dirty(inode);
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		epos->bh = nbh;
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	}

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	etype = udf_write_aext(inode, epos, eloc, elen, inc);
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1681

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1682
	if (!epos->bh)
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	{
		UDF_I_LENALLOC(inode) += adsize;
		mark_inode_dirty(inode);
	}
	else
	{
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1689
		aed = (struct allocExtDesc *)epos->bh->b_data;
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		aed->lengthAllocDescs =
			cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
J
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1693
			udf_update_tag(epos->bh->b_data, epos->offset + (inc ? 0 : adsize));
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1694
		else
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			udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
		mark_buffer_dirty_inode(epos->bh, inode);
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	}

	return etype;
}

J
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1702 1703
int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
    kernel_lb_addr eloc, uint32_t elen, int inc)
L
Linus Torvalds 已提交
1704 1705 1706 1707
{
	int adsize;
	uint8_t *ptr;

J
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1708 1709
	if (!epos->bh)
		ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
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	else
J
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1711
		ptr = epos->bh->b_data + epos->offset;
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	switch (UDF_I_ALLOCTYPE(inode))
	{
		case ICBTAG_FLAG_AD_SHORT:
		{
			short_ad *sad = (short_ad *)ptr;
			sad->extLength = cpu_to_le32(elen);
			sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
			adsize = sizeof(short_ad);
			break;
		}
		case ICBTAG_FLAG_AD_LONG:
		{
			long_ad *lad = (long_ad *)ptr;
			lad->extLength = cpu_to_le32(elen);
			lad->extLocation = cpu_to_lelb(eloc);
			memset(lad->impUse, 0x00, sizeof(lad->impUse));
			adsize = sizeof(long_ad);
			break;
		}
		default:
			return -1;
	}

J
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1736
	if (epos->bh)
L
Linus Torvalds 已提交
1737 1738 1739
	{
		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
		{
J
Jan Kara 已提交
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			struct allocExtDesc *aed = (struct allocExtDesc *)epos->bh->b_data;
			udf_update_tag(epos->bh->b_data,
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1742 1743
				le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
		}
J
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1744
		mark_buffer_dirty_inode(epos->bh, inode);
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749
	}
	else
		mark_inode_dirty(inode);

	if (inc)
J
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1750
		epos->offset += adsize;
L
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1751 1752 1753
	return (elen >> 30);
}

J
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1754 1755
int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
	kernel_lb_addr *eloc, uint32_t *elen, int inc)
L
Linus Torvalds 已提交
1756 1757 1758
{
	int8_t etype;

J
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1759
	while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
L
Linus Torvalds 已提交
1760 1761
		(EXT_NEXT_EXTENT_ALLOCDECS >> 30))
	{
J
Jan Kara 已提交
1762 1763 1764 1765
		epos->block = *eloc;
		epos->offset = sizeof(struct allocExtDesc);
		udf_release_data(epos->bh);
		if (!(epos->bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, epos->block, 0))))
L
Linus Torvalds 已提交
1766 1767
		{
			udf_debug("reading block %d failed!\n",
J
Jan Kara 已提交
1768
				udf_get_lb_pblock(inode->i_sb, epos->block, 0));
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Linus Torvalds 已提交
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			return -1;
		}
	}

	return etype;
}

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int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
	kernel_lb_addr *eloc, uint32_t *elen, int inc)
L
Linus Torvalds 已提交
1778 1779 1780 1781 1782
{
	int alen;
	int8_t etype;
	uint8_t *ptr;

J
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1783
	if (!epos->bh)
L
Linus Torvalds 已提交
1784
	{
J
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1785 1786 1787
		if (!epos->offset)
			epos->offset = udf_file_entry_alloc_offset(inode);
		ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
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		alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
	}
	else
	{
J
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1792 1793 1794 1795
		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);
L
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1796 1797 1798 1799 1800 1801 1802 1803
	}

	switch (UDF_I_ALLOCTYPE(inode))
	{
		case ICBTAG_FLAG_AD_SHORT:
		{
			short_ad *sad;

J
Jan Kara 已提交
1804
			if (!(sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc)))
L
Linus Torvalds 已提交
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
				return -1;

			etype = le32_to_cpu(sad->extLength) >> 30;
			eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
			eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
			*elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
			break;
		}
		case ICBTAG_FLAG_AD_LONG:
		{
			long_ad *lad;

J
Jan Kara 已提交
1817
			if (!(lad = udf_get_filelongad(ptr, alen, &epos->offset, inc)))
L
Linus Torvalds 已提交
1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
				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", UDF_I_ALLOCTYPE(inode));
			return -1;
		}
	}

	return etype;
}

static int8_t
J
Jan Kara 已提交
1836 1837
udf_insert_aext(struct inode *inode, struct extent_position epos,
		kernel_lb_addr neloc, uint32_t nelen)
L
Linus Torvalds 已提交
1838 1839 1840 1841 1842
{
	kernel_lb_addr oeloc;
	uint32_t oelen;
	int8_t etype;

J
Jan Kara 已提交
1843 1844
	if (epos.bh)
		atomic_inc(&epos.bh->b_count);
L
Linus Torvalds 已提交
1845

J
Jan Kara 已提交
1846
	while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1)
L
Linus Torvalds 已提交
1847
	{
J
Jan Kara 已提交
1848
		udf_write_aext(inode, &epos, neloc, nelen, 1);
L
Linus Torvalds 已提交
1849 1850 1851 1852

		neloc = oeloc;
		nelen = (etype << 30) | oelen;
	}
J
Jan Kara 已提交
1853 1854
	udf_add_aext(inode, &epos, neloc, nelen, 1);
	udf_release_data(epos.bh);
L
Linus Torvalds 已提交
1855 1856 1857
	return (nelen >> 30);
}

J
Jan Kara 已提交
1858 1859
int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
	kernel_lb_addr eloc, uint32_t elen)
L
Linus Torvalds 已提交
1860
{
J
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1861 1862
	struct extent_position oepos;
	int adsize;
L
Linus Torvalds 已提交
1863 1864 1865
	int8_t etype;
	struct allocExtDesc *aed;

J
Jan Kara 已提交
1866
	if (epos.bh)
L
Linus Torvalds 已提交
1867
	{
J
Jan Kara 已提交
1868 1869
		atomic_inc(&epos.bh->b_count);
		atomic_inc(&epos.bh->b_count);
L
Linus Torvalds 已提交
1870 1871 1872 1873 1874 1875 1876 1877 1878
	}

	if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
		adsize = sizeof(short_ad);
	else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
		adsize = sizeof(long_ad);
	else
		adsize = 0;

J
Jan Kara 已提交
1879 1880
	oepos = epos;
	if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
L
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1881 1882
		return -1;

J
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1883
	while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1)
L
Linus Torvalds 已提交
1884
	{
J
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1885 1886
		udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
		if (oepos.bh != epos.bh)
L
Linus Torvalds 已提交
1887
		{
J
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1888 1889 1890 1891 1892
			oepos.block = epos.block;
			udf_release_data(oepos.bh);
			atomic_inc(&epos.bh->b_count);
			oepos.bh = epos.bh;
			oepos.offset = epos.offset - adsize;
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Linus Torvalds 已提交
1893 1894 1895 1896 1897
		}
	}
	memset(&eloc, 0x00, sizeof(kernel_lb_addr));
	elen = 0;

J
Jan Kara 已提交
1898
	if (epos.bh != oepos.bh)
L
Linus Torvalds 已提交
1899
	{
J
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1900 1901 1902 1903
		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)
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Linus Torvalds 已提交
1904 1905 1906 1907 1908 1909
		{
			UDF_I_LENALLOC(inode) -= (adsize * 2);
			mark_inode_dirty(inode);
		}
		else
		{
J
Jan Kara 已提交
1910
			aed = (struct allocExtDesc *)oepos.bh->b_data;
L
Linus Torvalds 已提交
1911 1912 1913
			aed->lengthAllocDescs =
				cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2*adsize));
			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
J
Jan Kara 已提交
1914
				udf_update_tag(oepos.bh->b_data, oepos.offset - (2*adsize));
L
Linus Torvalds 已提交
1915
			else
J
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1916 1917
				udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
			mark_buffer_dirty_inode(oepos.bh, inode);
L
Linus Torvalds 已提交
1918 1919 1920 1921
		}
	}
	else
	{
J
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1922 1923
		udf_write_aext(inode, &oepos, eloc, elen, 1);
		if (!oepos.bh)
L
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1924 1925 1926 1927 1928 1929
		{
			UDF_I_LENALLOC(inode) -= adsize;
			mark_inode_dirty(inode);
		}
		else
		{
J
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1930
			aed = (struct allocExtDesc *)oepos.bh->b_data;
L
Linus Torvalds 已提交
1931 1932 1933
			aed->lengthAllocDescs =
				cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
J
Jan Kara 已提交
1934
				udf_update_tag(oepos.bh->b_data, epos.offset - adsize);
L
Linus Torvalds 已提交
1935
			else
J
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1936 1937
				udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
			mark_buffer_dirty_inode(oepos.bh, inode);
L
Linus Torvalds 已提交
1938 1939 1940
		}
	}
	
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1941 1942
	udf_release_data(epos.bh);
	udf_release_data(oepos.bh);
L
Linus Torvalds 已提交
1943 1944 1945
	return (elen >> 30);
}

J
Jan Kara 已提交
1946 1947
int8_t inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos,
	kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset)
L
Linus Torvalds 已提交
1948
{
1949
	loff_t lbcount = 0, bcount = (loff_t)block << inode->i_sb->s_blocksize_bits;
L
Linus Torvalds 已提交
1950 1951 1952 1953 1954 1955 1956 1957
	int8_t etype;

	if (block < 0)
	{
		printk(KERN_ERR "udf: inode_bmap: block < 0\n");
		return -1;
	}

J
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1958 1959 1960
	pos->offset = 0;
	pos->block = UDF_I_LOCATION(inode);
	pos->bh = NULL;
L
Linus Torvalds 已提交
1961 1962 1963 1964
	*elen = 0;

	do
	{
J
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1965
		if ((etype = udf_next_aext(inode, pos, eloc, elen, 1)) == -1)
L
Linus Torvalds 已提交
1966
		{
1967
			*offset = (bcount - lbcount) >> inode->i_sb->s_blocksize_bits;
L
Linus Torvalds 已提交
1968 1969 1970 1971 1972 1973
			UDF_I_LENEXTENTS(inode) = lbcount;
			return -1;
		}
		lbcount += *elen;
	} while (lbcount <= bcount);

1974
	*offset = (bcount + *elen - lbcount) >> inode->i_sb->s_blocksize_bits;
L
Linus Torvalds 已提交
1975 1976 1977 1978

	return etype;
}

1979
long udf_block_map(struct inode *inode, sector_t block)
L
Linus Torvalds 已提交
1980
{
J
Jan Kara 已提交
1981 1982
	kernel_lb_addr eloc;
	uint32_t elen;
1983
	sector_t offset;
J
Jan Kara 已提交
1984
	struct extent_position epos = { NULL, 0, { 0, 0}};
L
Linus Torvalds 已提交
1985 1986 1987 1988
	int ret;

	lock_kernel();

J
Jan Kara 已提交
1989
	if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1990
		ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
L
Linus Torvalds 已提交
1991 1992 1993 1994
	else
		ret = 0;

	unlock_kernel();
J
Jan Kara 已提交
1995
	udf_release_data(epos.bh);
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001

	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
		return udf_fixed_to_variable(ret);
	else
		return ret;
}