~ljy/RK3588_XEN.git

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

commit \| author \| age
a07526	1	/*
H	2	* inode.c
	3	*
	4	* PURPOSE
	5	* Inode handling routines for the OSTA-UDF(tm) filesystem.
	6	*
	7	* COPYRIGHT
	8	* This file is distributed under the terms of the GNU General Public
	9	* License (GPL). Copies of the GPL can be obtained from:
	10	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	11	* Each contributing author retains all rights to their own work.
	12	*
	13	* (C) 1998 Dave Boynton
	14	* (C) 1998-2004 Ben Fennema
	15	* (C) 1999-2000 Stelias Computing Inc
	16	*
	17	* HISTORY
	18	*
	19	* 10/04/98 dgb Added rudimentary directory functions
	20	* 10/07/98 Fully working udf_block_map! It works!
	21	* 11/25/98 bmap altered to better support extents
	22	* 12/06/98 blf partition support in udf_iget, udf_block_map
	23	* and udf_read_inode
	24	* 12/12/98 rewrote udf_block_map to handle next extents and descs across
	25	* block boundaries (which is not actually allowed)
	26	* 12/20/98 added support for strategy 4096
	27	* 03/07/99 rewrote udf_block_map (again)
	28	* New funcs, inode_bmap, udf_next_aext
	29	* 04/19/99 Support for writing device EA's for major/minor #
	30	*/
	31
	32	#include "udfdecl.h"
	33	#include <linux/mm.h>
	34	#include <linux/module.h>
	35	#include <linux/pagemap.h>
	36	#include <linux/writeback.h>
	37	#include <linux/slab.h>
	38	#include <linux/crc-itu-t.h>
	39	#include <linux/mpage.h>
	40	#include <linux/uio.h>
	41	#include <linux/bio.h>
	42
	43	#include "udf_i.h"
	44	#include "udf_sb.h"
	45
	46	#define EXTENT_MERGE_SIZE 5
	47
	48	#define FE_MAPPED_PERMS (FE_PERM_U_READ \| FE_PERM_U_WRITE \| FE_PERM_U_EXEC \| \
	49	FE_PERM_G_READ \| FE_PERM_G_WRITE \| FE_PERM_G_EXEC \| \
	50	FE_PERM_O_READ \| FE_PERM_O_WRITE \| FE_PERM_O_EXEC)
	51
	52	#define FE_DELETE_PERMS (FE_PERM_U_DELETE \| FE_PERM_G_DELETE \| \
	53	FE_PERM_O_DELETE)
	54
	55	static umode_t udf_convert_permissions(struct fileEntry *);
	56	static int udf_update_inode(struct inode *, int);
	57	static int udf_sync_inode(struct inode *inode);
	58	static int udf_alloc_i_data(struct inode *inode, size_t size);
	59	static sector_t inode_getblk(struct inode , sector_t, int , int *);
	60	static int8_t udf_insert_aext(struct inode *, struct extent_position,
	61	struct kernel_lb_addr, uint32_t);
	62	static void udf_split_extents(struct inode , int , int, udf_pblk_t,
	63	struct kernel_long_ad , int );
	64	static void udf_prealloc_extents(struct inode *, int, int,
	65	struct kernel_long_ad , int );
	66	static void udf_merge_extents(struct inode , struct kernel_long_ad , int *);
	67	static void udf_update_extents(struct inode , struct kernel_long_ad , int,
	68	int, struct extent_position *);
	69	static int udf_get_block(struct inode , sector_t, struct buffer_head , int);
	70
	71	static void __udf_clear_extent_cache(struct inode *inode)
	72	{
	73	struct udf_inode_info *iinfo = UDF_I(inode);
	74
	75	if (iinfo->cached_extent.lstart != -1) {
	76	brelse(iinfo->cached_extent.epos.bh);
	77	iinfo->cached_extent.lstart = -1;
	78	}
	79	}
	80
	81	/* Invalidate extent cache */
	82	static void udf_clear_extent_cache(struct inode *inode)
	83	{
	84	struct udf_inode_info *iinfo = UDF_I(inode);
	85
	86	spin_lock(&iinfo->i_extent_cache_lock);
	87	__udf_clear_extent_cache(inode);
	88	spin_unlock(&iinfo->i_extent_cache_lock);
	89	}
	90
	91	/* Return contents of extent cache */
	92	static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
	93	loff_t lbcount, struct extent_position pos)
	94	{
	95	struct udf_inode_info *iinfo = UDF_I(inode);
	96	int ret = 0;
	97
	98	spin_lock(&iinfo->i_extent_cache_lock);
	99	if ((iinfo->cached_extent.lstart <= bcount) &&
	100	(iinfo->cached_extent.lstart != -1)) {
	101	/* Cache hit */
	102	*lbcount = iinfo->cached_extent.lstart;
	103	memcpy(pos, &iinfo->cached_extent.epos,
	104	sizeof(struct extent_position));
	105	if (pos->bh)
	106	get_bh(pos->bh);
	107	ret = 1;
	108	}
	109	spin_unlock(&iinfo->i_extent_cache_lock);
	110	return ret;
	111	}
	112
	113	/* Add extent to extent cache */
	114	static void udf_update_extent_cache(struct inode *inode, loff_t estart,
	115	struct extent_position *pos)
	116	{
	117	struct udf_inode_info *iinfo = UDF_I(inode);
	118
	119	spin_lock(&iinfo->i_extent_cache_lock);
	120	/* Invalidate previously cached extent */
	121	__udf_clear_extent_cache(inode);
	122	if (pos->bh)
	123	get_bh(pos->bh);
	124	memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
	125	iinfo->cached_extent.lstart = estart;
	126	switch (iinfo->i_alloc_type) {
	127	case ICBTAG_FLAG_AD_SHORT:
	128	iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
	129	break;
	130	case ICBTAG_FLAG_AD_LONG:
	131	iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
	132	break;
	133	}
	134	spin_unlock(&iinfo->i_extent_cache_lock);
	135	}
	136
	137	void udf_evict_inode(struct inode *inode)
	138	{
	139	struct udf_inode_info *iinfo = UDF_I(inode);
	140	int want_delete = 0;
	141
	142	if (!is_bad_inode(inode)) {
	143	if (!inode->i_nlink) {
	144	want_delete = 1;
	145	udf_setsize(inode, 0);
	146	udf_update_inode(inode, IS_SYNC(inode));
	147	}
	148	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
	149	inode->i_size != iinfo->i_lenExtents) {
	150	udf_warn(inode->i_sb,
	151	"Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
	152	inode->i_ino, inode->i_mode,
	153	(unsigned long long)inode->i_size,
	154	(unsigned long long)iinfo->i_lenExtents);
	155	}
	156	}
	157	truncate_inode_pages_final(&inode->i_data);
	158	invalidate_inode_buffers(inode);
	159	clear_inode(inode);
	160	kfree(iinfo->i_data);
	161	iinfo->i_data = NULL;
	162	udf_clear_extent_cache(inode);
	163	if (want_delete) {
	164	udf_free_inode(inode);
	165	}
	166	}
	167
	168	static void udf_write_failed(struct address_space *mapping, loff_t to)
	169	{
	170	struct inode *inode = mapping->host;
	171	struct udf_inode_info *iinfo = UDF_I(inode);
	172	loff_t isize = inode->i_size;
	173
	174	if (to > isize) {
	175	truncate_pagecache(inode, isize);
	176	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
	177	down_write(&iinfo->i_data_sem);
	178	udf_clear_extent_cache(inode);
	179	udf_truncate_extents(inode);
	180	up_write(&iinfo->i_data_sem);
	181	}
	182	}
	183	}
	184
	185	static int udf_writepage(struct page page, struct writeback_control wbc)
	186	{
	187	return block_write_full_page(page, udf_get_block, wbc);
	188	}
	189
	190	static int udf_writepages(struct address_space *mapping,
	191	struct writeback_control *wbc)
	192	{
	193	return mpage_writepages(mapping, wbc, udf_get_block);
	194	}
	195
	196	static int udf_readpage(struct file file, struct page page)
	197	{
	198	return mpage_readpage(page, udf_get_block);
	199	}
	200
	201	static void udf_readahead(struct readahead_control *rac)
	202	{
	203	mpage_readahead(rac, udf_get_block);
	204	}
	205
	206	static int udf_write_begin(struct file file, struct address_space mapping,
	207	loff_t pos, unsigned len, unsigned flags,
	208	struct page pagep, void fsdata)
	209	{
	210	int ret;
	211
	212	ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
	213	if (unlikely(ret))
	214	udf_write_failed(mapping, pos + len);
	215	return ret;
	216	}
	217
	218	static ssize_t udf_direct_IO(struct kiocb iocb, struct iov_iter iter)
	219	{
	220	struct file *file = iocb->ki_filp;
	221	struct address_space *mapping = file->f_mapping;
	222	struct inode *inode = mapping->host;
	223	size_t count = iov_iter_count(iter);
	224	ssize_t ret;
	225
	226	ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
	227	if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
	228	udf_write_failed(mapping, iocb->ki_pos + count);
	229	return ret;
	230	}
	231
	232	static sector_t udf_bmap(struct address_space *mapping, sector_t block)
	233	{
	234	return generic_block_bmap(mapping, block, udf_get_block);
	235	}
	236
	237	const struct address_space_operations udf_aops = {
	238	.readpage = udf_readpage,
	239	.readahead = udf_readahead,
	240	.writepage = udf_writepage,
	241	.writepages = udf_writepages,
	242	.write_begin = udf_write_begin,
	243	.write_end = generic_write_end,
	244	.direct_IO = udf_direct_IO,
	245	.bmap = udf_bmap,
	246	};
	247
	248	/*
	249	* Expand file stored in ICB to a normal one-block-file
	250	*
	251	* This function requires i_data_sem for writing and releases it.
	252	* This function requires i_mutex held
	253	*/
	254	int udf_expand_file_adinicb(struct inode *inode)
	255	{
	256	struct page *page;
	257	char *kaddr;
	258	struct udf_inode_info *iinfo = UDF_I(inode);
	259	int err;
	260
	261	WARN_ON_ONCE(!inode_is_locked(inode));
	262	if (!iinfo->i_lenAlloc) {
	263	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
	264	iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
	265	else
	266	iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
	267	/* from now on we have normal address_space methods */
	268	inode->i_data.a_ops = &udf_aops;
	269	up_write(&iinfo->i_data_sem);
	270	mark_inode_dirty(inode);
	271	return 0;
	272	}
	273	/*
	274	* Release i_data_sem so that we can lock a page - page lock ranks
	275	* above i_data_sem. i_mutex still protects us against file changes.
	276	*/
	277	up_write(&iinfo->i_data_sem);
	278
	279	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
	280	if (!page)
	281	return -ENOMEM;
	282
	283	if (!PageUptodate(page)) {
	284	kaddr = kmap_atomic(page);
	285	memset(kaddr + iinfo->i_lenAlloc, 0x00,
	286	PAGE_SIZE - iinfo->i_lenAlloc);
	287	memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr,
	288	iinfo->i_lenAlloc);
	289	flush_dcache_page(page);
	290	SetPageUptodate(page);
	291	kunmap_atomic(kaddr);
	292	}
	293	down_write(&iinfo->i_data_sem);
	294	memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
	295	iinfo->i_lenAlloc);
	296	iinfo->i_lenAlloc = 0;
	297	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
	298	iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
	299	else
	300	iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
	301	/* from now on we have normal address_space methods */
	302	inode->i_data.a_ops = &udf_aops;
	303	set_page_dirty(page);
	304	unlock_page(page);
	305	up_write(&iinfo->i_data_sem);
	306	err = filemap_fdatawrite(inode->i_mapping);
	307	if (err) {
	308	/* Restore everything back so that we don't lose data... */
	309	lock_page(page);
	310	down_write(&iinfo->i_data_sem);
	311	kaddr = kmap_atomic(page);
	312	memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
	313	kunmap_atomic(kaddr);
	314	unlock_page(page);
	315	iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
	316	inode->i_data.a_ops = &udf_adinicb_aops;
	317	iinfo->i_lenAlloc = inode->i_size;
	318	up_write(&iinfo->i_data_sem);
	319	}
	320	put_page(page);
	321	mark_inode_dirty(inode);
	322
	323	return err;
	324	}
	325
	326	struct buffer_head udf_expand_dir_adinicb(struct inode inode,
	327	udf_pblk_t block, int err)
	328	{
	329	udf_pblk_t newblock;
	330	struct buffer_head *dbh = NULL;
	331	struct kernel_lb_addr eloc;
	332	uint8_t alloctype;
	333	struct extent_position epos;
	334
	335	struct udf_fileident_bh sfibh, dfibh;
	336	loff_t f_pos = udf_ext0_offset(inode);
	337	int size = udf_ext0_offset(inode) + inode->i_size;
	338	struct fileIdentDesc cfi, sfi, dfi;
	339	struct udf_inode_info *iinfo = UDF_I(inode);
	340
	341	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
	342	alloctype = ICBTAG_FLAG_AD_SHORT;
	343	else
	344	alloctype = ICBTAG_FLAG_AD_LONG;
	345
	346	if (!inode->i_size) {
	347	iinfo->i_alloc_type = alloctype;
	348	mark_inode_dirty(inode);
	349	return NULL;
	350	}
	351
	352	/* alloc block, and copy data to it */
	353	*block = udf_new_block(inode->i_sb, inode,
	354	iinfo->i_location.partitionReferenceNum,
	355	iinfo->i_location.logicalBlockNum, err);
	356	if (!(*block))
	357	return NULL;
	358	newblock = udf_get_pblock(inode->i_sb, *block,
	359	iinfo->i_location.partitionReferenceNum,
	360	0);
	361	if (!newblock)
	362	return NULL;
	363	dbh = udf_tgetblk(inode->i_sb, newblock);
	364	if (!dbh)
	365	return NULL;
	366	lock_buffer(dbh);
	367	memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
	368	set_buffer_uptodate(dbh);
	369	unlock_buffer(dbh);
	370	mark_buffer_dirty_inode(dbh, inode);
	371
	372	sfibh.soffset = sfibh.eoffset =
	373	f_pos & (inode->i_sb->s_blocksize - 1);
	374	sfibh.sbh = sfibh.ebh = NULL;
	375	dfibh.soffset = dfibh.eoffset = 0;
	376	dfibh.sbh = dfibh.ebh = dbh;
	377	while (f_pos < size) {
	378	iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
	379	sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
	380	NULL, NULL, NULL);
	381	if (!sfi) {
	382	brelse(dbh);
	383	return NULL;
	384	}
	385	iinfo->i_alloc_type = alloctype;
	386	sfi->descTag.tagLocation = cpu_to_le32(*block);
	387	dfibh.soffset = dfibh.eoffset;
	388	dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
	389	dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
	390	if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
	391	sfi->fileIdent +
	392	le16_to_cpu(sfi->lengthOfImpUse))) {
	393	iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
	394	brelse(dbh);
	395	return NULL;
	396	}
	397	}
	398	mark_buffer_dirty_inode(dbh, inode);
	399
	400	memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
	401	iinfo->i_lenAlloc = 0;
	402	eloc.logicalBlockNum = *block;
	403	eloc.partitionReferenceNum =
	404	iinfo->i_location.partitionReferenceNum;
	405	iinfo->i_lenExtents = inode->i_size;
	406	epos.bh = NULL;
	407	epos.block = iinfo->i_location;
	408	epos.offset = udf_file_entry_alloc_offset(inode);
	409	udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
	410	/* UniqueID stuff */
	411
	412	brelse(epos.bh);
	413	mark_inode_dirty(inode);
	414	return dbh;
	415	}
	416
	417	static int udf_get_block(struct inode *inode, sector_t block,
	418	struct buffer_head *bh_result, int create)
	419	{
	420	int err, new;
	421	sector_t phys = 0;
	422	struct udf_inode_info *iinfo;
	423
	424	if (!create) {
	425	phys = udf_block_map(inode, block);
	426	if (phys)
	427	map_bh(bh_result, inode->i_sb, phys);
	428	return 0;
	429	}
	430
	431	err = -EIO;
	432	new = 0;
	433	iinfo = UDF_I(inode);
	434
	435	down_write(&iinfo->i_data_sem);
	436	if (block == iinfo->i_next_alloc_block + 1) {
	437	iinfo->i_next_alloc_block++;
	438	iinfo->i_next_alloc_goal++;
	439	}
	440
2f529f	441	/*
H	442	* Block beyond EOF and prealloc extents? Just discard preallocation
	443	* as it is not useful and complicates things.
	444	*/
	445	if (((loff_t)block) << inode->i_blkbits > iinfo->i_lenExtents)
	446	udf_discard_prealloc(inode);
a07526	447	udf_clear_extent_cache(inode);
H	448	phys = inode_getblk(inode, block, &err, &new);
	449	if (!phys)
	450	goto abort;
	451
	452	if (new)
	453	set_buffer_new(bh_result);
	454	map_bh(bh_result, inode->i_sb, phys);
	455
	456	abort:
	457	up_write(&iinfo->i_data_sem);
	458	return err;
	459	}
	460
	461	static struct buffer_head udf_getblk(struct inode inode, udf_pblk_t block,
	462	int create, int *err)
	463	{
	464	struct buffer_head *bh;
	465	struct buffer_head dummy;
	466
	467	dummy.b_state = 0;
	468	dummy.b_blocknr = -1000;
	469	*err = udf_get_block(inode, block, &dummy, create);
	470	if (!*err && buffer_mapped(&dummy)) {
	471	bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
	472	if (buffer_new(&dummy)) {
	473	lock_buffer(bh);
	474	memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
	475	set_buffer_uptodate(bh);
	476	unlock_buffer(bh);
	477	mark_buffer_dirty_inode(bh, inode);
	478	}
	479	return bh;
	480	}
	481
	482	return NULL;
	483	}
	484
	485	/* Extend the file with new blocks totaling 'new_block_bytes',
	486	* return the number of extents added
	487	*/
	488	static int udf_do_extend_file(struct inode *inode,
	489	struct extent_position *last_pos,
	490	struct kernel_long_ad *last_ext,
	491	loff_t new_block_bytes)
	492	{
	493	uint32_t add;
	494	int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
	495	struct super_block *sb = inode->i_sb;
	496	struct udf_inode_info *iinfo;
	497	int err;
	498
	499	/* The previous extent is fake and we should not extend by anything
	500	* - there's nothing to do... */
	501	if (!new_block_bytes && fake)
	502	return 0;
	503
	504	iinfo = UDF_I(inode);
	505	/* Round the last extent up to a multiple of block size */
	506	if (last_ext->extLength & (sb->s_blocksize - 1)) {
	507	last_ext->extLength =
	508	(last_ext->extLength & UDF_EXTENT_FLAG_MASK) \|
	509	(((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
	510	sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
	511	iinfo->i_lenExtents =
	512	(iinfo->i_lenExtents + sb->s_blocksize - 1) &
	513	~(sb->s_blocksize - 1);
	514	}
	515
	516	/* Can we merge with the previous extent? */
	517	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
	518	EXT_NOT_RECORDED_NOT_ALLOCATED) {
	519	add = (1 << 30) - sb->s_blocksize -
	520	(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
	521	if (add > new_block_bytes)
	522	add = new_block_bytes;
	523	new_block_bytes -= add;
	524	last_ext->extLength += add;
	525	}
	526
	527	if (fake) {
	528	udf_add_aext(inode, last_pos, &last_ext->extLocation,
	529	last_ext->extLength, 1);
	530	count++;
	531	} else {
	532	struct kernel_lb_addr tmploc;
	533	uint32_t tmplen;
	534
	535	udf_write_aext(inode, last_pos, &last_ext->extLocation,
	536	last_ext->extLength, 1);
	537
	538	/*
	539	* We've rewritten the last extent. If we are going to add
	540	* more extents, we may need to enter possible following
	541	* empty indirect extent.
	542	*/
2f529f	543	if (new_block_bytes)
a07526	544	udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
H	545	}
	546
	547	/* Managed to do everything necessary? */
	548	if (!new_block_bytes)
	549	goto out;
	550
	551	/* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
	552	last_ext->extLocation.logicalBlockNum = 0;
	553	last_ext->extLocation.partitionReferenceNum = 0;
	554	add = (1 << 30) - sb->s_blocksize;
	555	last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED \| add;
	556
	557	/* Create enough extents to cover the whole hole */
	558	while (new_block_bytes > add) {
	559	new_block_bytes -= add;
	560	err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
	561	last_ext->extLength, 1);
	562	if (err)
	563	return err;
	564	count++;
	565	}
	566	if (new_block_bytes) {
	567	last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED \|
	568	new_block_bytes;
	569	err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
	570	last_ext->extLength, 1);
	571	if (err)
	572	return err;
	573	count++;
	574	}
	575
	576	out:
	577	/* last_pos should point to the last written extent... */
	578	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	579	last_pos->offset -= sizeof(struct short_ad);
	580	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	581	last_pos->offset -= sizeof(struct long_ad);
	582	else
	583	return -EIO;
	584
	585	return count;
	586	}
	587
	588	/* Extend the final block of the file to final_block_len bytes */
	589	static void udf_do_extend_final_block(struct inode *inode,
	590	struct extent_position *last_pos,
	591	struct kernel_long_ad *last_ext,
2f529f	592	uint32_t new_elen)
a07526	593	{
H	594	uint32_t added_bytes;
	595
2f529f	596	/*
H	597	* Extent already large enough? It may be already rounded up to block
	598	* size...
	599	*/
	600	if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
	601	return;
	602	added_bytes = (last_ext->extLength & UDF_EXTENT_LENGTH_MASK) - new_elen;
a07526	603	last_ext->extLength += added_bytes;
H	604	UDF_I(inode)->i_lenExtents += added_bytes;
	605
	606	udf_write_aext(inode, last_pos, &last_ext->extLocation,
	607	last_ext->extLength, 1);
	608	}
	609
	610	static int udf_extend_file(struct inode *inode, loff_t newsize)
	611	{
	612
	613	struct extent_position epos;
	614	struct kernel_lb_addr eloc;
	615	uint32_t elen;
	616	int8_t etype;
	617	struct super_block *sb = inode->i_sb;
	618	sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
2f529f	619	loff_t new_elen;
a07526	620	int adsize;
H	621	struct udf_inode_info *iinfo = UDF_I(inode);
	622	struct kernel_long_ad extent;
	623	int err = 0;
2f529f	624	bool within_last_ext;
a07526	625
H	626	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	627	adsize = sizeof(struct short_ad);
	628	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	629	adsize = sizeof(struct long_ad);
	630	else
	631	BUG();
	632
2f529f	633	/*
H	634	* When creating hole in file, just don't bother with preserving
	635	* preallocation. It likely won't be very useful anyway.
	636	*/
	637	udf_discard_prealloc(inode);
	638
a07526	639	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
2f529f	640	within_last_ext = (etype != -1);
H	641	/* We don't expect extents past EOF... */
	642	WARN_ON_ONCE(within_last_ext &&
	643	elen > ((loff_t)offset + 1) << inode->i_blkbits);
a07526	644
H	645	if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) \|\|
	646	(epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
	647	/* File has no extents at all or has empty last
	648	* indirect extent! Create a fake extent... */
	649	extent.extLocation.logicalBlockNum = 0;
	650	extent.extLocation.partitionReferenceNum = 0;
	651	extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
	652	} else {
	653	epos.offset -= adsize;
	654	etype = udf_next_aext(inode, &epos, &extent.extLocation,
	655	&extent.extLength, 0);
	656	extent.extLength \|= etype << 30;
	657	}
	658
2f529f	659	new_elen = ((loff_t)offset << inode->i_blkbits) \|
H	660	(newsize & (sb->s_blocksize - 1));
a07526	661
H	662	/* File has extent covering the new size (could happen when extending
	663	* inside a block)?
	664	*/
2f529f	665	if (within_last_ext) {
a07526	666	/* Extending file within the last file block */
2f529f	667	udf_do_extend_final_block(inode, &epos, &extent, new_elen);
a07526	668	} else {
2f529f	669	err = udf_do_extend_file(inode, &epos, &extent, new_elen);
a07526	670	}
H	671
	672	if (err < 0)
	673	goto out;
	674	err = 0;
	675	iinfo->i_lenExtents = newsize;
	676	out:
	677	brelse(epos.bh);
	678	return err;
	679	}
	680
	681	static sector_t inode_getblk(struct inode *inode, sector_t block,
	682	int err, int new)
	683	{
	684	struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
	685	struct extent_position prev_epos, cur_epos, next_epos;
	686	int count = 0, startnum = 0, endnum = 0;
	687	uint32_t elen = 0, tmpelen;
	688	struct kernel_lb_addr eloc, tmpeloc;
	689	int c = 1;
	690	loff_t lbcount = 0, b_off = 0;
	691	udf_pblk_t newblocknum, newblock;
	692	sector_t offset = 0;
	693	int8_t etype;
	694	struct udf_inode_info *iinfo = UDF_I(inode);
	695	udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
	696	int lastblock = 0;
	697	bool isBeyondEOF;
	698
	699	*err = 0;
	700	*new = 0;
	701	prev_epos.offset = udf_file_entry_alloc_offset(inode);
	702	prev_epos.block = iinfo->i_location;
	703	prev_epos.bh = NULL;
	704	cur_epos = next_epos = prev_epos;
	705	b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
	706
	707	/* find the extent which contains the block we are looking for.
	708	alternate between laarr[0] and laarr[1] for locations of the
	709	current extent, and the previous extent */
	710	do {
	711	if (prev_epos.bh != cur_epos.bh) {
	712	brelse(prev_epos.bh);
	713	get_bh(cur_epos.bh);
	714	prev_epos.bh = cur_epos.bh;
	715	}
	716	if (cur_epos.bh != next_epos.bh) {
	717	brelse(cur_epos.bh);
	718	get_bh(next_epos.bh);
	719	cur_epos.bh = next_epos.bh;
	720	}
	721
	722	lbcount += elen;
	723
	724	prev_epos.block = cur_epos.block;
	725	cur_epos.block = next_epos.block;
	726
	727	prev_epos.offset = cur_epos.offset;
	728	cur_epos.offset = next_epos.offset;
	729
	730	etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
	731	if (etype == -1)
	732	break;
	733
	734	c = !c;
	735
	736	laarr[c].extLength = (etype << 30) \| elen;
	737	laarr[c].extLocation = eloc;
	738
	739	if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
	740	pgoal = eloc.logicalBlockNum +
	741	((elen + inode->i_sb->s_blocksize - 1) >>
	742	inode->i_sb->s_blocksize_bits);
	743
	744	count++;
	745	} while (lbcount + elen <= b_off);
	746
	747	b_off -= lbcount;
	748	offset = b_off >> inode->i_sb->s_blocksize_bits;
	749	/*
	750	* Move prev_epos and cur_epos into indirect extent if we are at
	751	* the pointer to it
	752	*/
	753	udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
	754	udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
	755
	756	/* if the extent is allocated and recorded, return the block
	757	if the extent is not a multiple of the blocksize, round up */
	758
	759	if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
	760	if (elen & (inode->i_sb->s_blocksize - 1)) {
	761	elen = EXT_RECORDED_ALLOCATED \|
	762	((elen + inode->i_sb->s_blocksize - 1) &
	763	~(inode->i_sb->s_blocksize - 1));
	764	udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
	765	}
	766	newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
	767	goto out_free;
	768	}
	769
2f529f	770	/* Are we beyond EOF and preallocated extent? */
a07526	771	if (etype == -1) {
H	772	int ret;
	773	loff_t hole_len;
2f529f	774
a07526	775	isBeyondEOF = true;
H	776	if (count) {
	777	if (c)
	778	laarr[0] = laarr[1];
	779	startnum = 1;
	780	} else {
	781	/* Create a fake extent when there's not one */
	782	memset(&laarr[0].extLocation, 0x00,
	783	sizeof(struct kernel_lb_addr));
	784	laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
	785	/* Will udf_do_extend_file() create real extent from
	786	a fake one? */
	787	startnum = (offset > 0);
	788	}
	789	/* Create extents for the hole between EOF and offset */
	790	hole_len = (loff_t)offset << inode->i_blkbits;
	791	ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
	792	if (ret < 0) {
	793	*err = ret;
	794	newblock = 0;
	795	goto out_free;
	796	}
	797	c = 0;
	798	offset = 0;
	799	count += ret;
	800	/* We are not covered by a preallocated extent? */
	801	if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
	802	EXT_NOT_RECORDED_ALLOCATED) {
	803	/* Is there any real extent? - otherwise we overwrite
	804	* the fake one... */
	805	if (count)
	806	c = !c;
	807	laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED \|
	808	inode->i_sb->s_blocksize;
	809	memset(&laarr[c].extLocation, 0x00,
	810	sizeof(struct kernel_lb_addr));
	811	count++;
	812	}
	813	endnum = c + 1;
	814	lastblock = 1;
	815	} else {
	816	isBeyondEOF = false;
	817	endnum = startnum = ((count > 2) ? 2 : count);
	818
	819	/* if the current extent is in position 0,
	820	swap it with the previous */
	821	if (!c && count != 1) {
	822	laarr[2] = laarr[0];
	823	laarr[0] = laarr[1];
	824	laarr[1] = laarr[2];
	825	c = 1;
	826	}
	827
	828	/* if the current block is located in an extent,
	829	read the next extent */
	830	etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
	831	if (etype != -1) {
	832	laarr[c + 1].extLength = (etype << 30) \| elen;
	833	laarr[c + 1].extLocation = eloc;
	834	count++;
	835	startnum++;
	836	endnum++;
	837	} else
	838	lastblock = 1;
	839	}
	840
	841	/* if the current extent is not recorded but allocated, get the
	842	* block in the extent corresponding to the requested block */
	843	if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
	844	newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
	845	else { /* otherwise, allocate a new block */
	846	if (iinfo->i_next_alloc_block == block)
	847	goal = iinfo->i_next_alloc_goal;
	848
	849	if (!goal) {
	850	if (!(goal = pgoal)) /* XXX: what was intended here? */
	851	goal = iinfo->i_location.logicalBlockNum + 1;
	852	}
	853
	854	newblocknum = udf_new_block(inode->i_sb, inode,
	855	iinfo->i_location.partitionReferenceNum,
	856	goal, err);
	857	if (!newblocknum) {
	858	*err = -ENOSPC;
	859	newblock = 0;
	860	goto out_free;
	861	}
	862	if (isBeyondEOF)
	863	iinfo->i_lenExtents += inode->i_sb->s_blocksize;
	864	}
	865
	866	/* if the extent the requsted block is located in contains multiple
	867	* blocks, split the extent into at most three extents. blocks prior
	868	* to requested block, requested block, and blocks after requested
	869	* block */
	870	udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
	871
	872	/* We preallocate blocks only for regular files. It also makes sense
	873	* for directories but there's a problem when to drop the
	874	* preallocation. We might use some delayed work for that but I feel
	875	* it's overengineering for a filesystem like UDF. */
	876	if (S_ISREG(inode->i_mode))
	877	udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
	878
	879	/* merge any continuous blocks in laarr */
	880	udf_merge_extents(inode, laarr, &endnum);
	881
	882	/* write back the new extents, inserting new extents if the new number
	883	* of extents is greater than the old number, and deleting extents if
	884	* the new number of extents is less than the old number */
	885	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
	886
	887	newblock = udf_get_pblock(inode->i_sb, newblocknum,
	888	iinfo->i_location.partitionReferenceNum, 0);
	889	if (!newblock) {
	890	*err = -EIO;
	891	goto out_free;
	892	}
	893	*new = 1;
	894	iinfo->i_next_alloc_block = block;
	895	iinfo->i_next_alloc_goal = newblocknum;
	896	inode->i_ctime = current_time(inode);
	897
	898	if (IS_SYNC(inode))
	899	udf_sync_inode(inode);
	900	else
	901	mark_inode_dirty(inode);
	902	out_free:
	903	brelse(prev_epos.bh);
	904	brelse(cur_epos.bh);
	905	brelse(next_epos.bh);
	906	return newblock;
	907	}
	908
	909	static void udf_split_extents(struct inode inode, int c, int offset,
	910	udf_pblk_t newblocknum,
	911	struct kernel_long_ad laarr, int endnum)
	912	{
	913	unsigned long blocksize = inode->i_sb->s_blocksize;
	914	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
	915
	916	if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) \|\|
	917	(laarr[*c].extLength >> 30) ==
	918	(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
	919	int curr = *c;
	920	int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
	921	blocksize - 1) >> blocksize_bits;
	922	int8_t etype = (laarr[curr].extLength >> 30);
	923
	924	if (blen == 1)
	925	;
	926	else if (!offset \|\| blen == offset + 1) {
	927	laarr[curr + 2] = laarr[curr + 1];
	928	laarr[curr + 1] = laarr[curr];
	929	} else {
	930	laarr[curr + 3] = laarr[curr + 1];
	931	laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
	932	}
	933
	934	if (offset) {
	935	if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
	936	udf_free_blocks(inode->i_sb, inode,
	937	&laarr[curr].extLocation,
	938	0, offset);
	939	laarr[curr].extLength =
	940	EXT_NOT_RECORDED_NOT_ALLOCATED \|
	941	(offset << blocksize_bits);
	942	laarr[curr].extLocation.logicalBlockNum = 0;
	943	laarr[curr].extLocation.
	944	partitionReferenceNum = 0;
	945	} else
	946	laarr[curr].extLength = (etype << 30) \|
	947	(offset << blocksize_bits);
	948	curr++;
	949	(*c)++;
	950	(*endnum)++;
	951	}
	952
	953	laarr[curr].extLocation.logicalBlockNum = newblocknum;
	954	if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
	955	laarr[curr].extLocation.partitionReferenceNum =
	956	UDF_I(inode)->i_location.partitionReferenceNum;
	957	laarr[curr].extLength = EXT_RECORDED_ALLOCATED \|
	958	blocksize;
	959	curr++;
	960
	961	if (blen != offset + 1) {
	962	if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
	963	laarr[curr].extLocation.logicalBlockNum +=
	964	offset + 1;
	965	laarr[curr].extLength = (etype << 30) \|
	966	((blen - (offset + 1)) << blocksize_bits);
	967	curr++;
	968	(*endnum)++;
	969	}
	970	}
	971	}
	972
	973	static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
	974	struct kernel_long_ad *laarr,
	975	int *endnum)
	976	{
	977	int start, length = 0, currlength = 0, i;
	978
	979	if (*endnum >= (c + 1)) {
	980	if (!lastblock)
	981	return;
	982	else
	983	start = c;
	984	} else {
	985	if ((laarr[c + 1].extLength >> 30) ==
	986	(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
	987	start = c + 1;
	988	length = currlength =
	989	(((laarr[c + 1].extLength &
	990	UDF_EXTENT_LENGTH_MASK) +
	991	inode->i_sb->s_blocksize - 1) >>
	992	inode->i_sb->s_blocksize_bits);
	993	} else
	994	start = c;
	995	}
	996
	997	for (i = start + 1; i <= *endnum; i++) {
	998	if (i == *endnum) {
	999	if (lastblock)
	1000	length += UDF_DEFAULT_PREALLOC_BLOCKS;
	1001	} else if ((laarr[i].extLength >> 30) ==
	1002	(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
	1003	length += (((laarr[i].extLength &
	1004	UDF_EXTENT_LENGTH_MASK) +
	1005	inode->i_sb->s_blocksize - 1) >>
	1006	inode->i_sb->s_blocksize_bits);
	1007	} else
	1008	break;
	1009	}
	1010
	1011	if (length) {
	1012	int next = laarr[start].extLocation.logicalBlockNum +
	1013	(((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
	1014	inode->i_sb->s_blocksize - 1) >>
	1015	inode->i_sb->s_blocksize_bits);
	1016	int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
	1017	laarr[start].extLocation.partitionReferenceNum,
	1018	next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
	1019	length : UDF_DEFAULT_PREALLOC_BLOCKS) -
	1020	currlength);
	1021	if (numalloc) {
	1022	if (start == (c + 1))
	1023	laarr[start].extLength +=
	1024	(numalloc <<
	1025	inode->i_sb->s_blocksize_bits);
	1026	else {
	1027	memmove(&laarr[c + 2], &laarr[c + 1],
	1028	sizeof(struct long_ad) * (*endnum - (c + 1)));
	1029	(*endnum)++;
	1030	laarr[c + 1].extLocation.logicalBlockNum = next;
	1031	laarr[c + 1].extLocation.partitionReferenceNum =
	1032	laarr[c].extLocation.
	1033	partitionReferenceNum;
	1034	laarr[c + 1].extLength =
	1035	EXT_NOT_RECORDED_ALLOCATED \|
	1036	(numalloc <<
	1037	inode->i_sb->s_blocksize_bits);
	1038	start = c + 1;
	1039	}
	1040
	1041	for (i = start + 1; numalloc && i < *endnum; i++) {
	1042	int elen = ((laarr[i].extLength &
	1043	UDF_EXTENT_LENGTH_MASK) +
	1044	inode->i_sb->s_blocksize - 1) >>
	1045	inode->i_sb->s_blocksize_bits;
	1046
	1047	if (elen > numalloc) {
	1048	laarr[i].extLength -=
	1049	(numalloc <<
	1050	inode->i_sb->s_blocksize_bits);
	1051	numalloc = 0;
	1052	} else {
	1053	numalloc -= elen;
	1054	if (*endnum > (i + 1))
	1055	memmove(&laarr[i],
	1056	&laarr[i + 1],
	1057	sizeof(struct long_ad) *
	1058	(*endnum - (i + 1)));
	1059	i--;
	1060	(*endnum)--;
	1061	}
	1062	}
	1063	UDF_I(inode)->i_lenExtents +=
	1064	numalloc << inode->i_sb->s_blocksize_bits;
	1065	}
	1066	}
	1067	}
	1068
	1069	static void udf_merge_extents(struct inode inode, struct kernel_long_ad laarr,
	1070	int *endnum)
	1071	{
	1072	int i;
	1073	unsigned long blocksize = inode->i_sb->s_blocksize;
	1074	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
	1075
	1076	for (i = 0; i < (*endnum - 1); i++) {
	1077	struct kernel_long_ad li /l[i]*/ = &laarr[i];
	1078	struct kernel_long_ad lip1 /l[i plus 1]*/ = &laarr[i + 1];
	1079
	1080	if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
	1081	(((li->extLength >> 30) ==
	1082	(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) \|\|
	1083	((lip1->extLocation.logicalBlockNum -
	1084	li->extLocation.logicalBlockNum) ==
	1085	(((li->extLength & UDF_EXTENT_LENGTH_MASK) +
	1086	blocksize - 1) >> blocksize_bits)))) {
	1087
	1088	if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
	1089	(lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
	1090	blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
	1091	lip1->extLength = (lip1->extLength -
	1092	(li->extLength &
	1093	UDF_EXTENT_LENGTH_MASK) +
	1094	UDF_EXTENT_LENGTH_MASK) &
	1095	~(blocksize - 1);
	1096	li->extLength = (li->extLength &
	1097	UDF_EXTENT_FLAG_MASK) +
	1098	(UDF_EXTENT_LENGTH_MASK + 1) -
	1099	blocksize;
	1100	lip1->extLocation.logicalBlockNum =
	1101	li->extLocation.logicalBlockNum +
	1102	((li->extLength &
	1103	UDF_EXTENT_LENGTH_MASK) >>
	1104	blocksize_bits);
	1105	} else {
	1106	li->extLength = lip1->extLength +
	1107	(((li->extLength &
	1108	UDF_EXTENT_LENGTH_MASK) +
	1109	blocksize - 1) & ~(blocksize - 1));
	1110	if (*endnum > (i + 2))
	1111	memmove(&laarr[i + 1], &laarr[i + 2],
	1112	sizeof(struct long_ad) *
	1113	(*endnum - (i + 2)));
	1114	i--;
	1115	(*endnum)--;
	1116	}
	1117	} else if (((li->extLength >> 30) ==
	1118	(EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
	1119	((lip1->extLength >> 30) ==
	1120	(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
	1121	udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
	1122	((li->extLength &
	1123	UDF_EXTENT_LENGTH_MASK) +
	1124	blocksize - 1) >> blocksize_bits);
	1125	li->extLocation.logicalBlockNum = 0;
	1126	li->extLocation.partitionReferenceNum = 0;
	1127
	1128	if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
	1129	(lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
	1130	blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
	1131	lip1->extLength = (lip1->extLength -
	1132	(li->extLength &
	1133	UDF_EXTENT_LENGTH_MASK) +
	1134	UDF_EXTENT_LENGTH_MASK) &
	1135	~(blocksize - 1);
	1136	li->extLength = (li->extLength &
	1137	UDF_EXTENT_FLAG_MASK) +
	1138	(UDF_EXTENT_LENGTH_MASK + 1) -
	1139	blocksize;
	1140	} else {
	1141	li->extLength = lip1->extLength +
	1142	(((li->extLength &
	1143	UDF_EXTENT_LENGTH_MASK) +
	1144	blocksize - 1) & ~(blocksize - 1));
	1145	if (*endnum > (i + 2))
	1146	memmove(&laarr[i + 1], &laarr[i + 2],
	1147	sizeof(struct long_ad) *
	1148	(*endnum - (i + 2)));
	1149	i--;
	1150	(*endnum)--;
	1151	}
	1152	} else if ((li->extLength >> 30) ==
	1153	(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
	1154	udf_free_blocks(inode->i_sb, inode,
	1155	&li->extLocation, 0,
	1156	((li->extLength &
	1157	UDF_EXTENT_LENGTH_MASK) +
	1158	blocksize - 1) >> blocksize_bits);
	1159	li->extLocation.logicalBlockNum = 0;
	1160	li->extLocation.partitionReferenceNum = 0;
	1161	li->extLength = (li->extLength &
	1162	UDF_EXTENT_LENGTH_MASK) \|
	1163	EXT_NOT_RECORDED_NOT_ALLOCATED;
	1164	}
	1165	}
	1166	}
	1167
	1168	static void udf_update_extents(struct inode inode, struct kernel_long_ad laarr,
	1169	int startnum, int endnum,
	1170	struct extent_position *epos)
	1171	{
	1172	int start = 0, i;
	1173	struct kernel_lb_addr tmploc;
	1174	uint32_t tmplen;
	1175
	1176	if (startnum > endnum) {
	1177	for (i = 0; i < (startnum - endnum); i++)
	1178	udf_delete_aext(inode, *epos);
	1179	} else if (startnum < endnum) {
	1180	for (i = 0; i < (endnum - startnum); i++) {
	1181	udf_insert_aext(inode, *epos, laarr[i].extLocation,
	1182	laarr[i].extLength);
	1183	udf_next_aext(inode, epos, &laarr[i].extLocation,
	1184	&laarr[i].extLength, 1);
	1185	start++;
	1186	}
	1187	}
	1188
	1189	for (i = start; i < endnum; i++) {
	1190	udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
	1191	udf_write_aext(inode, epos, &laarr[i].extLocation,
	1192	laarr[i].extLength, 1);
	1193	}
	1194	}
	1195
	1196	struct buffer_head udf_bread(struct inode inode, udf_pblk_t block,
	1197	int create, int *err)
	1198	{
	1199	struct buffer_head *bh = NULL;
	1200
	1201	bh = udf_getblk(inode, block, create, err);
	1202	if (!bh)
	1203	return NULL;
	1204
	1205	if (buffer_uptodate(bh))
	1206	return bh;
	1207
	1208	ll_rw_block(REQ_OP_READ, 0, 1, &bh);
	1209
	1210	wait_on_buffer(bh);
	1211	if (buffer_uptodate(bh))
	1212	return bh;
	1213
	1214	brelse(bh);
	1215	*err = -EIO;
	1216	return NULL;
	1217	}
	1218
	1219	int udf_setsize(struct inode *inode, loff_t newsize)
	1220	{
	1221	int err;
	1222	struct udf_inode_info *iinfo;
	1223	unsigned int bsize = i_blocksize(inode);
	1224
	1225	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	1226	S_ISLNK(inode->i_mode)))
	1227	return -EINVAL;
	1228	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
	1229	return -EPERM;
	1230
	1231	iinfo = UDF_I(inode);
	1232	if (newsize > inode->i_size) {
	1233	down_write(&iinfo->i_data_sem);
	1234	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
	1235	if (bsize <
	1236	(udf_file_entry_alloc_offset(inode) + newsize)) {
	1237	err = udf_expand_file_adinicb(inode);
	1238	if (err)
	1239	return err;
	1240	down_write(&iinfo->i_data_sem);
	1241	} else {
	1242	iinfo->i_lenAlloc = newsize;
	1243	goto set_size;
	1244	}
	1245	}
	1246	err = udf_extend_file(inode, newsize);
	1247	if (err) {
	1248	up_write(&iinfo->i_data_sem);
	1249	return err;
	1250	}
	1251	set_size:
	1252	up_write(&iinfo->i_data_sem);
	1253	truncate_setsize(inode, newsize);
	1254	} else {
	1255	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
	1256	down_write(&iinfo->i_data_sem);
	1257	udf_clear_extent_cache(inode);
	1258	memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
	1259	0x00, bsize - newsize -
	1260	udf_file_entry_alloc_offset(inode));
	1261	iinfo->i_lenAlloc = newsize;
	1262	truncate_setsize(inode, newsize);
	1263	up_write(&iinfo->i_data_sem);
	1264	goto update_time;
	1265	}
	1266	err = block_truncate_page(inode->i_mapping, newsize,
	1267	udf_get_block);
	1268	if (err)
	1269	return err;
	1270	truncate_setsize(inode, newsize);
	1271	down_write(&iinfo->i_data_sem);
	1272	udf_clear_extent_cache(inode);
	1273	err = udf_truncate_extents(inode);
	1274	up_write(&iinfo->i_data_sem);
	1275	if (err)
	1276	return err;
	1277	}
	1278	update_time:
	1279	inode->i_mtime = inode->i_ctime = current_time(inode);
	1280	if (IS_SYNC(inode))
	1281	udf_sync_inode(inode);
	1282	else
	1283	mark_inode_dirty(inode);
	1284	return 0;
	1285	}
	1286
	1287	/*
	1288	* Maximum length of linked list formed by ICB hierarchy. The chosen number is
	1289	* arbitrary - just that we hopefully don't limit any real use of rewritten
	1290	* inode on write-once media but avoid looping for too long on corrupted media.
	1291	*/
	1292	#define UDF_MAX_ICB_NESTING 1024
	1293
	1294	static int udf_read_inode(struct inode *inode, bool hidden_inode)
	1295	{
	1296	struct buffer_head *bh = NULL;
	1297	struct fileEntry *fe;
	1298	struct extendedFileEntry *efe;
	1299	uint16_t ident;
	1300	struct udf_inode_info *iinfo = UDF_I(inode);
	1301	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
	1302	struct kernel_lb_addr *iloc = &iinfo->i_location;
	1303	unsigned int link_count;
	1304	unsigned int indirections = 0;
	1305	int bs = inode->i_sb->s_blocksize;
	1306	int ret = -EIO;
	1307	uint32_t uid, gid;
	1308
	1309	reread:
	1310	if (iloc->partitionReferenceNum >= sbi->s_partitions) {
	1311	udf_debug("partition reference: %u > logical volume partitions: %u\n",
	1312	iloc->partitionReferenceNum, sbi->s_partitions);
	1313	return -EIO;
	1314	}
	1315
	1316	if (iloc->logicalBlockNum >=
	1317	sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
	1318	udf_debug("block=%u, partition=%u out of range\n",
	1319	iloc->logicalBlockNum, iloc->partitionReferenceNum);
	1320	return -EIO;
	1321	}
	1322
	1323	/*
	1324	* Set defaults, but the inode is still incomplete!
	1325	* Note: get_new_inode() sets the following on a new inode:
	1326	* i_sb = sb
	1327	* i_no = ino
	1328	* i_flags = sb->s_flags
	1329	* i_state = 0
	1330	* clean_inode(): zero fills and sets
	1331	* i_count = 1
	1332	* i_nlink = 1
	1333	* i_op = NULL;
	1334	*/
	1335	bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
	1336	if (!bh) {
	1337	udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
	1338	return -EIO;
	1339	}
	1340
	1341	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
	1342	ident != TAG_IDENT_USE) {
	1343	udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
	1344	inode->i_ino, ident);
	1345	goto out;
	1346	}
	1347
	1348	fe = (struct fileEntry *)bh->b_data;
	1349	efe = (struct extendedFileEntry *)bh->b_data;
	1350
	1351	if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
	1352	struct buffer_head *ibh;
	1353
	1354	ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
	1355	if (ident == TAG_IDENT_IE && ibh) {
	1356	struct kernel_lb_addr loc;
	1357	struct indirectEntry *ie;
	1358
	1359	ie = (struct indirectEntry *)ibh->b_data;
	1360	loc = lelb_to_cpu(ie->indirectICB.extLocation);
	1361
	1362	if (ie->indirectICB.extLength) {
	1363	brelse(ibh);
	1364	memcpy(&iinfo->i_location, &loc,
	1365	sizeof(struct kernel_lb_addr));
	1366	if (++indirections > UDF_MAX_ICB_NESTING) {
	1367	udf_err(inode->i_sb,
	1368	"too many ICBs in ICB hierarchy"
	1369	" (max %d supported)\n",
	1370	UDF_MAX_ICB_NESTING);
	1371	goto out;
	1372	}
	1373	brelse(bh);
	1374	goto reread;
	1375	}
	1376	}
	1377	brelse(ibh);
	1378	} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
	1379	udf_err(inode->i_sb, "unsupported strategy type: %u\n",
	1380	le16_to_cpu(fe->icbTag.strategyType));
	1381	goto out;
	1382	}
	1383	if (fe->icbTag.strategyType == cpu_to_le16(4))
	1384	iinfo->i_strat4096 = 0;
	1385	else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
	1386	iinfo->i_strat4096 = 1;
	1387
	1388	iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
	1389	ICBTAG_FLAG_AD_MASK;
	1390	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
	1391	iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
	1392	iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
	1393	ret = -EIO;
	1394	goto out;
	1395	}
	1396	iinfo->i_unique = 0;
	1397	iinfo->i_lenEAttr = 0;
	1398	iinfo->i_lenExtents = 0;
	1399	iinfo->i_lenAlloc = 0;
	1400	iinfo->i_next_alloc_block = 0;
	1401	iinfo->i_next_alloc_goal = 0;
	1402	if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
	1403	iinfo->i_efe = 1;
	1404	iinfo->i_use = 0;
	1405	ret = udf_alloc_i_data(inode, bs -
	1406	sizeof(struct extendedFileEntry));
	1407	if (ret)
	1408	goto out;
	1409	memcpy(iinfo->i_data,
	1410	bh->b_data + sizeof(struct extendedFileEntry),
	1411	bs - sizeof(struct extendedFileEntry));
	1412	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
	1413	iinfo->i_efe = 0;
	1414	iinfo->i_use = 0;
	1415	ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
	1416	if (ret)
	1417	goto out;
	1418	memcpy(iinfo->i_data,
	1419	bh->b_data + sizeof(struct fileEntry),
	1420	bs - sizeof(struct fileEntry));
	1421	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
	1422	iinfo->i_efe = 0;
	1423	iinfo->i_use = 1;
	1424	iinfo->i_lenAlloc = le32_to_cpu(
	1425	((struct unallocSpaceEntry *)bh->b_data)->
	1426	lengthAllocDescs);
	1427	ret = udf_alloc_i_data(inode, bs -
	1428	sizeof(struct unallocSpaceEntry));
	1429	if (ret)
	1430	goto out;
	1431	memcpy(iinfo->i_data,
	1432	bh->b_data + sizeof(struct unallocSpaceEntry),
	1433	bs - sizeof(struct unallocSpaceEntry));
	1434	return 0;
	1435	}
	1436
	1437	ret = -EIO;
	1438	read_lock(&sbi->s_cred_lock);
	1439	uid = le32_to_cpu(fe->uid);
	1440	if (uid == UDF_INVALID_ID \|\|
	1441	UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
	1442	inode->i_uid = sbi->s_uid;
	1443	else
	1444	i_uid_write(inode, uid);
	1445
	1446	gid = le32_to_cpu(fe->gid);
	1447	if (gid == UDF_INVALID_ID \|\|
	1448	UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
	1449	inode->i_gid = sbi->s_gid;
	1450	else
	1451	i_gid_write(inode, gid);
	1452
	1453	if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
	1454	sbi->s_fmode != UDF_INVALID_MODE)
	1455	inode->i_mode = sbi->s_fmode;
	1456	else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
	1457	sbi->s_dmode != UDF_INVALID_MODE)
	1458	inode->i_mode = sbi->s_dmode;
	1459	else
	1460	inode->i_mode = udf_convert_permissions(fe);
	1461	inode->i_mode &= ~sbi->s_umask;
	1462	iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
	1463
	1464	read_unlock(&sbi->s_cred_lock);
	1465
	1466	link_count = le16_to_cpu(fe->fileLinkCount);
	1467	if (!link_count) {
	1468	if (!hidden_inode) {
	1469	ret = -ESTALE;
	1470	goto out;
	1471	}
	1472	link_count = 1;
	1473	}
	1474	set_nlink(inode, link_count);
	1475
	1476	inode->i_size = le64_to_cpu(fe->informationLength);
	1477	iinfo->i_lenExtents = inode->i_size;
	1478
	1479	if (iinfo->i_efe == 0) {
	1480	inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
	1481	(inode->i_sb->s_blocksize_bits - 9);
	1482
	1483	udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
	1484	udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
	1485	udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
	1486
	1487	iinfo->i_unique = le64_to_cpu(fe->uniqueID);
	1488	iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
	1489	iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
	1490	iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
	1491	iinfo->i_streamdir = 0;
	1492	iinfo->i_lenStreams = 0;
	1493	} else {
	1494	inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
	1495	(inode->i_sb->s_blocksize_bits - 9);
	1496
	1497	udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
	1498	udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
	1499	udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
	1500	udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
	1501
	1502	iinfo->i_unique = le64_to_cpu(efe->uniqueID);
	1503	iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
	1504	iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
	1505	iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
	1506
	1507	/* Named streams */
	1508	iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
	1509	iinfo->i_locStreamdir =
	1510	lelb_to_cpu(efe->streamDirectoryICB.extLocation);
	1511	iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
	1512	if (iinfo->i_lenStreams >= inode->i_size)
	1513	iinfo->i_lenStreams -= inode->i_size;
	1514	else
	1515	iinfo->i_lenStreams = 0;
	1516	}
	1517	inode->i_generation = iinfo->i_unique;
	1518
	1519	/*
	1520	* Sanity check length of allocation descriptors and extended attrs to
	1521	* avoid integer overflows
	1522	*/
	1523	if (iinfo->i_lenEAttr > bs \|\| iinfo->i_lenAlloc > bs)
	1524	goto out;
	1525	/* Now do exact checks */
	1526	if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
	1527	goto out;
	1528	/* Sanity checks for files in ICB so that we don't get confused later */
	1529	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
	1530	/*
	1531	* For file in ICB data is stored in allocation descriptor
	1532	* so sizes should match
	1533	*/
	1534	if (iinfo->i_lenAlloc != inode->i_size)
	1535	goto out;
	1536	/* File in ICB has to fit in there... */
	1537	if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
	1538	goto out;
	1539	}
	1540
	1541	switch (fe->icbTag.fileType) {
	1542	case ICBTAG_FILE_TYPE_DIRECTORY:
	1543	inode->i_op = &udf_dir_inode_operations;
	1544	inode->i_fop = &udf_dir_operations;
	1545	inode->i_mode \|= S_IFDIR;
	1546	inc_nlink(inode);
	1547	break;
	1548	case ICBTAG_FILE_TYPE_REALTIME:
	1549	case ICBTAG_FILE_TYPE_REGULAR:
	1550	case ICBTAG_FILE_TYPE_UNDEF:
	1551	case ICBTAG_FILE_TYPE_VAT20:
	1552	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
	1553	inode->i_data.a_ops = &udf_adinicb_aops;
	1554	else
	1555	inode->i_data.a_ops = &udf_aops;
	1556	inode->i_op = &udf_file_inode_operations;
	1557	inode->i_fop = &udf_file_operations;
	1558	inode->i_mode \|= S_IFREG;
	1559	break;
	1560	case ICBTAG_FILE_TYPE_BLOCK:
	1561	inode->i_mode \|= S_IFBLK;
	1562	break;
	1563	case ICBTAG_FILE_TYPE_CHAR:
	1564	inode->i_mode \|= S_IFCHR;
	1565	break;
	1566	case ICBTAG_FILE_TYPE_FIFO:
	1567	init_special_inode(inode, inode->i_mode \| S_IFIFO, 0);
	1568	break;
	1569	case ICBTAG_FILE_TYPE_SOCKET:
	1570	init_special_inode(inode, inode->i_mode \| S_IFSOCK, 0);
	1571	break;
	1572	case ICBTAG_FILE_TYPE_SYMLINK:
	1573	inode->i_data.a_ops = &udf_symlink_aops;
	1574	inode->i_op = &udf_symlink_inode_operations;
	1575	inode_nohighmem(inode);
	1576	inode->i_mode = S_IFLNK \| 0777;
	1577	break;
	1578	case ICBTAG_FILE_TYPE_MAIN:
	1579	udf_debug("METADATA FILE-----\n");
	1580	break;
	1581	case ICBTAG_FILE_TYPE_MIRROR:
	1582	udf_debug("METADATA MIRROR FILE-----\n");
	1583	break;
	1584	case ICBTAG_FILE_TYPE_BITMAP:
	1585	udf_debug("METADATA BITMAP FILE-----\n");
	1586	break;
	1587	default:
	1588	udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
	1589	inode->i_ino, fe->icbTag.fileType);
	1590	goto out;
	1591	}
	1592	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode)) {
	1593	struct deviceSpec *dsea =
	1594	(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
	1595	if (dsea) {
	1596	init_special_inode(inode, inode->i_mode,
	1597	MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
	1598	le32_to_cpu(dsea->minorDeviceIdent)));
	1599	/* Developer ID ??? */
	1600	} else
	1601	goto out;
	1602	}
	1603	ret = 0;
	1604	out:
	1605	brelse(bh);
	1606	return ret;
	1607	}
	1608
	1609	static int udf_alloc_i_data(struct inode *inode, size_t size)
	1610	{
	1611	struct udf_inode_info *iinfo = UDF_I(inode);
	1612	iinfo->i_data = kmalloc(size, GFP_KERNEL);
	1613	if (!iinfo->i_data)
	1614	return -ENOMEM;
	1615	return 0;
	1616	}
	1617
	1618	static umode_t udf_convert_permissions(struct fileEntry *fe)
	1619	{
	1620	umode_t mode;
	1621	uint32_t permissions;
	1622	uint32_t flags;
	1623
	1624	permissions = le32_to_cpu(fe->permissions);
	1625	flags = le16_to_cpu(fe->icbTag.flags);
	1626
	1627	mode = ((permissions) & 0007) \|
	1628	((permissions >> 2) & 0070) \|
	1629	((permissions >> 4) & 0700) \|
	1630	((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) \|
	1631	((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) \|
	1632	((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
	1633
	1634	return mode;
	1635	}
	1636
	1637	void udf_update_extra_perms(struct inode *inode, umode_t mode)
	1638	{
	1639	struct udf_inode_info *iinfo = UDF_I(inode);
	1640
	1641	/*
	1642	* UDF 2.01 sec. 3.3.3.3 Note 2:
	1643	* In Unix, delete permission tracks write
	1644	*/
	1645	iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
	1646	if (mode & 0200)
	1647	iinfo->i_extraPerms \|= FE_PERM_U_DELETE;
	1648	if (mode & 0020)
	1649	iinfo->i_extraPerms \|= FE_PERM_G_DELETE;
	1650	if (mode & 0002)
	1651	iinfo->i_extraPerms \|= FE_PERM_O_DELETE;
	1652	}
	1653
	1654	int udf_write_inode(struct inode inode, struct writeback_control wbc)
	1655	{
	1656	return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
	1657	}
	1658
	1659	static int udf_sync_inode(struct inode *inode)
	1660	{
	1661	return udf_update_inode(inode, 1);
	1662	}
	1663
	1664	static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
	1665	{
	1666	if (iinfo->i_crtime.tv_sec > time.tv_sec \|\|
	1667	(iinfo->i_crtime.tv_sec == time.tv_sec &&
	1668	iinfo->i_crtime.tv_nsec > time.tv_nsec))
	1669	iinfo->i_crtime = time;
	1670	}
	1671
	1672	static int udf_update_inode(struct inode *inode, int do_sync)
	1673	{
	1674	struct buffer_head *bh = NULL;
	1675	struct fileEntry *fe;
	1676	struct extendedFileEntry *efe;
	1677	uint64_t lb_recorded;
	1678	uint32_t udfperms;
	1679	uint16_t icbflags;
	1680	uint16_t crclen;
	1681	int err = 0;
	1682	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
	1683	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
	1684	struct udf_inode_info *iinfo = UDF_I(inode);
	1685
	1686	bh = udf_tgetblk(inode->i_sb,
	1687	udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
	1688	if (!bh) {
	1689	udf_debug("getblk failure\n");
	1690	return -EIO;
	1691	}
	1692
	1693	lock_buffer(bh);
	1694	memset(bh->b_data, 0, inode->i_sb->s_blocksize);
	1695	fe = (struct fileEntry *)bh->b_data;
	1696	efe = (struct extendedFileEntry *)bh->b_data;
	1697
	1698	if (iinfo->i_use) {
	1699	struct unallocSpaceEntry *use =
	1700	(struct unallocSpaceEntry *)bh->b_data;
	1701
	1702	use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
	1703	memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
	1704	iinfo->i_data, inode->i_sb->s_blocksize -
	1705	sizeof(struct unallocSpaceEntry));
	1706	use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
	1707	crclen = sizeof(struct unallocSpaceEntry);
	1708
	1709	goto finish;
	1710	}
	1711
	1712	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
	1713	fe->uid = cpu_to_le32(UDF_INVALID_ID);
	1714	else
	1715	fe->uid = cpu_to_le32(i_uid_read(inode));
	1716
	1717	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
	1718	fe->gid = cpu_to_le32(UDF_INVALID_ID);
	1719	else
	1720	fe->gid = cpu_to_le32(i_gid_read(inode));
	1721
	1722	udfperms = ((inode->i_mode & 0007)) \|
	1723	((inode->i_mode & 0070) << 2) \|
	1724	((inode->i_mode & 0700) << 4);
	1725
	1726	udfperms \|= iinfo->i_extraPerms;
	1727	fe->permissions = cpu_to_le32(udfperms);
	1728
	1729	if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
	1730	fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
	1731	else
	1732	fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
	1733
	1734	fe->informationLength = cpu_to_le64(inode->i_size);
	1735
	1736	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode)) {
	1737	struct regid *eid;
	1738	struct deviceSpec *dsea =
	1739	(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
	1740	if (!dsea) {
	1741	dsea = (struct deviceSpec *)
	1742	udf_add_extendedattr(inode,
	1743	sizeof(struct deviceSpec) +
	1744	sizeof(struct regid), 12, 0x3);
	1745	dsea->attrType = cpu_to_le32(12);
	1746	dsea->attrSubtype = 1;
	1747	dsea->attrLength = cpu_to_le32(
	1748	sizeof(struct deviceSpec) +
	1749	sizeof(struct regid));
	1750	dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
	1751	}
	1752	eid = (struct regid *)dsea->impUse;
	1753	memset(eid, 0, sizeof(*eid));
	1754	strcpy(eid->ident, UDF_ID_DEVELOPER);
	1755	eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
	1756	eid->identSuffix[1] = UDF_OS_ID_LINUX;
	1757	dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
	1758	dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
	1759	}
	1760
	1761	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
	1762	lb_recorded = 0; /* No extents => no blocks! */
	1763	else
	1764	lb_recorded =
	1765	(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
	1766	(blocksize_bits - 9);
	1767
	1768	if (iinfo->i_efe == 0) {
	1769	memcpy(bh->b_data + sizeof(struct fileEntry),
	1770	iinfo->i_data,
	1771	inode->i_sb->s_blocksize - sizeof(struct fileEntry));
	1772	fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
	1773
	1774	udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
	1775	udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
	1776	udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
	1777	memset(&(fe->impIdent), 0, sizeof(struct regid));
	1778	strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
	1779	fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
	1780	fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
	1781	fe->uniqueID = cpu_to_le64(iinfo->i_unique);
	1782	fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
	1783	fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
	1784	fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
	1785	fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
	1786	crclen = sizeof(struct fileEntry);
	1787	} else {
	1788	memcpy(bh->b_data + sizeof(struct extendedFileEntry),
	1789	iinfo->i_data,
	1790	inode->i_sb->s_blocksize -
	1791	sizeof(struct extendedFileEntry));
	1792	efe->objectSize =
	1793	cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
	1794	efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
	1795
	1796	if (iinfo->i_streamdir) {
	1797	struct long_ad *icb_lad = &efe->streamDirectoryICB;
	1798
	1799	icb_lad->extLocation =
	1800	cpu_to_lelb(iinfo->i_locStreamdir);
	1801	icb_lad->extLength =
	1802	cpu_to_le32(inode->i_sb->s_blocksize);
	1803	}
	1804
	1805	udf_adjust_time(iinfo, inode->i_atime);
	1806	udf_adjust_time(iinfo, inode->i_mtime);
	1807	udf_adjust_time(iinfo, inode->i_ctime);
	1808
	1809	udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
	1810	udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
	1811	udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
	1812	udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
	1813
	1814	memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
	1815	strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
	1816	efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
	1817	efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
	1818	efe->uniqueID = cpu_to_le64(iinfo->i_unique);
	1819	efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
	1820	efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
	1821	efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
	1822	efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
	1823	crclen = sizeof(struct extendedFileEntry);
	1824	}
	1825
	1826	finish:
	1827	if (iinfo->i_strat4096) {
	1828	fe->icbTag.strategyType = cpu_to_le16(4096);
	1829	fe->icbTag.strategyParameter = cpu_to_le16(1);
	1830	fe->icbTag.numEntries = cpu_to_le16(2);
	1831	} else {
	1832	fe->icbTag.strategyType = cpu_to_le16(4);
	1833	fe->icbTag.numEntries = cpu_to_le16(1);
	1834	}
	1835
	1836	if (iinfo->i_use)
	1837	fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
	1838	else if (S_ISDIR(inode->i_mode))
	1839	fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
	1840	else if (S_ISREG(inode->i_mode))
	1841	fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
	1842	else if (S_ISLNK(inode->i_mode))
	1843	fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
	1844	else if (S_ISBLK(inode->i_mode))
	1845	fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
	1846	else if (S_ISCHR(inode->i_mode))
	1847	fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
	1848	else if (S_ISFIFO(inode->i_mode))
	1849	fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
	1850	else if (S_ISSOCK(inode->i_mode))
	1851	fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
	1852
	1853	icbflags = iinfo->i_alloc_type \|
	1854	((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) \|
	1855	((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) \|
	1856	((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) \|
	1857	(le16_to_cpu(fe->icbTag.flags) &
	1858	~(ICBTAG_FLAG_AD_MASK \| ICBTAG_FLAG_SETUID \|
	1859	ICBTAG_FLAG_SETGID \| ICBTAG_FLAG_STICKY));
	1860
	1861	fe->icbTag.flags = cpu_to_le16(icbflags);
	1862	if (sbi->s_udfrev >= 0x0200)
	1863	fe->descTag.descVersion = cpu_to_le16(3);
	1864	else
	1865	fe->descTag.descVersion = cpu_to_le16(2);
	1866	fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
	1867	fe->descTag.tagLocation = cpu_to_le32(
	1868	iinfo->i_location.logicalBlockNum);
	1869	crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
	1870	fe->descTag.descCRCLength = cpu_to_le16(crclen);
	1871	fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
	1872	crclen));
	1873	fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
	1874
	1875	set_buffer_uptodate(bh);
	1876	unlock_buffer(bh);
	1877
	1878	/* write the data blocks */
	1879	mark_buffer_dirty(bh);
	1880	if (do_sync) {
	1881	sync_dirty_buffer(bh);
	1882	if (buffer_write_io_error(bh)) {
	1883	udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
	1884	inode->i_ino);
	1885	err = -EIO;
	1886	}
	1887	}
	1888	brelse(bh);
	1889
	1890	return err;
	1891	}
	1892
	1893	struct inode __udf_iget(struct super_block sb, struct kernel_lb_addr *ino,
	1894	bool hidden_inode)
	1895	{
	1896	unsigned long block = udf_get_lb_pblock(sb, ino, 0);
	1897	struct inode *inode = iget_locked(sb, block);
	1898	int err;
	1899
	1900	if (!inode)
	1901	return ERR_PTR(-ENOMEM);
	1902
	1903	if (!(inode->i_state & I_NEW))
	1904	return inode;
	1905
	1906	memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
	1907	err = udf_read_inode(inode, hidden_inode);
	1908	if (err < 0) {
	1909	iget_failed(inode);
	1910	return ERR_PTR(err);
	1911	}
	1912	unlock_new_inode(inode);
	1913
	1914	return inode;
	1915	}
	1916
	1917	int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
	1918	struct extent_position *epos)
	1919	{
	1920	struct super_block *sb = inode->i_sb;
	1921	struct buffer_head *bh;
	1922	struct allocExtDesc *aed;
	1923	struct extent_position nepos;
	1924	struct kernel_lb_addr neloc;
	1925	int ver, adsize;
	1926
	1927	if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	1928	adsize = sizeof(struct short_ad);
	1929	else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	1930	adsize = sizeof(struct long_ad);
	1931	else
	1932	return -EIO;
	1933
	1934	neloc.logicalBlockNum = block;
	1935	neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
	1936
	1937	bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
	1938	if (!bh)
	1939	return -EIO;
	1940	lock_buffer(bh);
	1941	memset(bh->b_data, 0x00, sb->s_blocksize);
	1942	set_buffer_uptodate(bh);
	1943	unlock_buffer(bh);
	1944	mark_buffer_dirty_inode(bh, inode);
	1945
	1946	aed = (struct allocExtDesc *)(bh->b_data);
	1947	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
	1948	aed->previousAllocExtLocation =
	1949	cpu_to_le32(epos->block.logicalBlockNum);
	1950	}
	1951	aed->lengthAllocDescs = cpu_to_le32(0);
	1952	if (UDF_SB(sb)->s_udfrev >= 0x0200)
	1953	ver = 3;
	1954	else
	1955	ver = 2;
	1956	udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
	1957	sizeof(struct tag));
	1958
	1959	nepos.block = neloc;
	1960	nepos.offset = sizeof(struct allocExtDesc);
	1961	nepos.bh = bh;
	1962
	1963	/*
	1964	* Do we have to copy current last extent to make space for indirect
	1965	* one?
	1966	*/
	1967	if (epos->offset + adsize > sb->s_blocksize) {
	1968	struct kernel_lb_addr cp_loc;
	1969	uint32_t cp_len;
	1970	int cp_type;
	1971
	1972	epos->offset -= adsize;
	1973	cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
	1974	cp_len \|= ((uint32_t)cp_type) << 30;
	1975
	1976	__udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
	1977	udf_write_aext(inode, epos, &nepos.block,
	1978	sb->s_blocksize \| EXT_NEXT_EXTENT_ALLOCDESCS, 0);
	1979	} else {
	1980	__udf_add_aext(inode, epos, &nepos.block,
	1981	sb->s_blocksize \| EXT_NEXT_EXTENT_ALLOCDESCS, 0);
	1982	}
	1983
	1984	brelse(epos->bh);
	1985	*epos = nepos;
	1986
	1987	return 0;
	1988	}
	1989
	1990	/*
	1991	* Append extent at the given position - should be the first free one in inode
	1992	* / indirect extent. This function assumes there is enough space in the inode
	1993	* or indirect extent. Use udf_add_aext() if you didn't check for this before.
	1994	*/
	1995	int __udf_add_aext(struct inode inode, struct extent_position epos,
	1996	struct kernel_lb_addr *eloc, uint32_t elen, int inc)
	1997	{
	1998	struct udf_inode_info *iinfo = UDF_I(inode);
	1999	struct allocExtDesc *aed;
	2000	int adsize;
	2001
	2002	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	2003	adsize = sizeof(struct short_ad);
	2004	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	2005	adsize = sizeof(struct long_ad);
	2006	else
	2007	return -EIO;
	2008
	2009	if (!epos->bh) {
	2010	WARN_ON(iinfo->i_lenAlloc !=
	2011	epos->offset - udf_file_entry_alloc_offset(inode));
	2012	} else {
	2013	aed = (struct allocExtDesc *)epos->bh->b_data;
	2014	WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
	2015	epos->offset - sizeof(struct allocExtDesc));
	2016	WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
	2017	}
	2018
	2019	udf_write_aext(inode, epos, eloc, elen, inc);
	2020
	2021	if (!epos->bh) {
	2022	iinfo->i_lenAlloc += adsize;
	2023	mark_inode_dirty(inode);
	2024	} else {
	2025	aed = (struct allocExtDesc *)epos->bh->b_data;
	2026	le32_add_cpu(&aed->lengthAllocDescs, adsize);
	2027	if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) \|\|
	2028	UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
	2029	udf_update_tag(epos->bh->b_data,
	2030	epos->offset + (inc ? 0 : adsize));
	2031	else
	2032	udf_update_tag(epos->bh->b_data,
	2033	sizeof(struct allocExtDesc));
	2034	mark_buffer_dirty_inode(epos->bh, inode);
	2035	}
	2036
	2037	return 0;
	2038	}
	2039
	2040	/*
	2041	* Append extent at given position - should be the first free one in inode
	2042	* / indirect extent. Takes care of allocating and linking indirect blocks.
	2043	*/
	2044	int udf_add_aext(struct inode inode, struct extent_position epos,
	2045	struct kernel_lb_addr *eloc, uint32_t elen, int inc)
	2046	{
	2047	int adsize;
	2048	struct super_block *sb = inode->i_sb;
	2049
	2050	if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	2051	adsize = sizeof(struct short_ad);
	2052	else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	2053	adsize = sizeof(struct long_ad);
	2054	else
	2055	return -EIO;
	2056
	2057	if (epos->offset + (2 * adsize) > sb->s_blocksize) {
	2058	int err;
	2059	udf_pblk_t new_block;
	2060
	2061	new_block = udf_new_block(sb, NULL,
	2062	epos->block.partitionReferenceNum,
	2063	epos->block.logicalBlockNum, &err);
	2064	if (!new_block)
	2065	return -ENOSPC;
	2066
	2067	err = udf_setup_indirect_aext(inode, new_block, epos);
	2068	if (err)
	2069	return err;
	2070	}
	2071
	2072	return __udf_add_aext(inode, epos, eloc, elen, inc);
	2073	}
	2074
	2075	void udf_write_aext(struct inode inode, struct extent_position epos,
	2076	struct kernel_lb_addr *eloc, uint32_t elen, int inc)
	2077	{
	2078	int adsize;
	2079	uint8_t *ptr;
	2080	struct short_ad *sad;
	2081	struct long_ad *lad;
	2082	struct udf_inode_info *iinfo = UDF_I(inode);
	2083
	2084	if (!epos->bh)
	2085	ptr = iinfo->i_data + epos->offset -
	2086	udf_file_entry_alloc_offset(inode) +
	2087	iinfo->i_lenEAttr;
	2088	else
	2089	ptr = epos->bh->b_data + epos->offset;
	2090
	2091	switch (iinfo->i_alloc_type) {
	2092	case ICBTAG_FLAG_AD_SHORT:
	2093	sad = (struct short_ad *)ptr;
	2094	sad->extLength = cpu_to_le32(elen);
	2095	sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
	2096	adsize = sizeof(struct short_ad);
	2097	break;
	2098	case ICBTAG_FLAG_AD_LONG:
	2099	lad = (struct long_ad *)ptr;
	2100	lad->extLength = cpu_to_le32(elen);
	2101	lad->extLocation = cpu_to_lelb(*eloc);
	2102	memset(lad->impUse, 0x00, sizeof(lad->impUse));
	2103	adsize = sizeof(struct long_ad);
	2104	break;
	2105	default:
	2106	return;
	2107	}
	2108
	2109	if (epos->bh) {
	2110	if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) \|\|
	2111	UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
	2112	struct allocExtDesc *aed =
	2113	(struct allocExtDesc *)epos->bh->b_data;
	2114	udf_update_tag(epos->bh->b_data,
	2115	le32_to_cpu(aed->lengthAllocDescs) +
	2116	sizeof(struct allocExtDesc));
	2117	}
	2118	mark_buffer_dirty_inode(epos->bh, inode);
	2119	} else {
	2120	mark_inode_dirty(inode);
	2121	}
	2122
	2123	if (inc)
	2124	epos->offset += adsize;
	2125	}
	2126
	2127	/*
	2128	* Only 1 indirect extent in a row really makes sense but allow upto 16 in case
	2129	* someone does some weird stuff.
	2130	*/
	2131	#define UDF_MAX_INDIR_EXTS 16
	2132
	2133	int8_t udf_next_aext(struct inode inode, struct extent_position epos,
	2134	struct kernel_lb_addr eloc, uint32_t elen, int inc)
	2135	{
	2136	int8_t etype;
	2137	unsigned int indirections = 0;
	2138
	2139	while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
	2140	(EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
	2141	udf_pblk_t block;
	2142
	2143	if (++indirections > UDF_MAX_INDIR_EXTS) {
	2144	udf_err(inode->i_sb,
	2145	"too many indirect extents in inode %lu\n",
	2146	inode->i_ino);
	2147	return -1;
	2148	}
	2149
	2150	epos->block = *eloc;
	2151	epos->offset = sizeof(struct allocExtDesc);
	2152	brelse(epos->bh);
	2153	block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
	2154	epos->bh = udf_tread(inode->i_sb, block);
	2155	if (!epos->bh) {
	2156	udf_debug("reading block %u failed!\n", block);
	2157	return -1;
	2158	}
	2159	}
	2160
	2161	return etype;
	2162	}
	2163
	2164	int8_t udf_current_aext(struct inode inode, struct extent_position epos,
	2165	struct kernel_lb_addr eloc, uint32_t elen, int inc)
	2166	{
	2167	int alen;
	2168	int8_t etype;
	2169	uint8_t *ptr;
	2170	struct short_ad *sad;
	2171	struct long_ad *lad;
	2172	struct udf_inode_info *iinfo = UDF_I(inode);
	2173
	2174	if (!epos->bh) {
	2175	if (!epos->offset)
	2176	epos->offset = udf_file_entry_alloc_offset(inode);
	2177	ptr = iinfo->i_data + epos->offset -
	2178	udf_file_entry_alloc_offset(inode) +
	2179	iinfo->i_lenEAttr;
	2180	alen = udf_file_entry_alloc_offset(inode) +
	2181	iinfo->i_lenAlloc;
	2182	} else {
	2183	if (!epos->offset)
	2184	epos->offset = sizeof(struct allocExtDesc);
	2185	ptr = epos->bh->b_data + epos->offset;
	2186	alen = sizeof(struct allocExtDesc) +
	2187	le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
	2188	lengthAllocDescs);
	2189	}
	2190
	2191	switch (iinfo->i_alloc_type) {
	2192	case ICBTAG_FLAG_AD_SHORT:
	2193	sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
	2194	if (!sad)
	2195	return -1;
	2196	etype = le32_to_cpu(sad->extLength) >> 30;
	2197	eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
	2198	eloc->partitionReferenceNum =
	2199	iinfo->i_location.partitionReferenceNum;
	2200	*elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
	2201	break;
	2202	case ICBTAG_FLAG_AD_LONG:
	2203	lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
	2204	if (!lad)
	2205	return -1;
	2206	etype = le32_to_cpu(lad->extLength) >> 30;
	2207	*eloc = lelb_to_cpu(lad->extLocation);
	2208	*elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
	2209	break;
	2210	default:
	2211	udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
	2212	return -1;
	2213	}
	2214
	2215	return etype;
	2216	}
	2217
	2218	static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
	2219	struct kernel_lb_addr neloc, uint32_t nelen)
	2220	{
	2221	struct kernel_lb_addr oeloc;
	2222	uint32_t oelen;
	2223	int8_t etype;
	2224
	2225	if (epos.bh)
	2226	get_bh(epos.bh);
	2227
	2228	while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
	2229	udf_write_aext(inode, &epos, &neloc, nelen, 1);
	2230	neloc = oeloc;
	2231	nelen = (etype << 30) \| oelen;
	2232	}
	2233	udf_add_aext(inode, &epos, &neloc, nelen, 1);
	2234	brelse(epos.bh);
	2235
	2236	return (nelen >> 30);
	2237	}
	2238
	2239	int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
	2240	{
	2241	struct extent_position oepos;
	2242	int adsize;
	2243	int8_t etype;
	2244	struct allocExtDesc *aed;
	2245	struct udf_inode_info *iinfo;
	2246	struct kernel_lb_addr eloc;
	2247	uint32_t elen;
	2248
	2249	if (epos.bh) {
	2250	get_bh(epos.bh);
	2251	get_bh(epos.bh);
	2252	}
	2253
	2254	iinfo = UDF_I(inode);
	2255	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
	2256	adsize = sizeof(struct short_ad);
	2257	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
	2258	adsize = sizeof(struct long_ad);
	2259	else
	2260	adsize = 0;
	2261
	2262	oepos = epos;
	2263	if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
	2264	return -1;
	2265
	2266	while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
	2267	udf_write_aext(inode, &oepos, &eloc, (etype << 30) \| elen, 1);
	2268	if (oepos.bh != epos.bh) {
	2269	oepos.block = epos.block;
	2270	brelse(oepos.bh);
	2271	get_bh(epos.bh);
	2272	oepos.bh = epos.bh;
	2273	oepos.offset = epos.offset - adsize;
	2274	}
	2275	}
	2276	memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
	2277	elen = 0;
	2278
	2279	if (epos.bh != oepos.bh) {
	2280	udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
	2281	udf_write_aext(inode, &oepos, &eloc, elen, 1);
	2282	udf_write_aext(inode, &oepos, &eloc, elen, 1);
	2283	if (!oepos.bh) {
	2284	iinfo->i_lenAlloc -= (adsize * 2);
	2285	mark_inode_dirty(inode);
	2286	} else {
	2287	aed = (struct allocExtDesc *)oepos.bh->b_data;
	2288	le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
	2289	if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) \|\|
	2290	UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
	2291	udf_update_tag(oepos.bh->b_data,
	2292	oepos.offset - (2 * adsize));
	2293	else
	2294	udf_update_tag(oepos.bh->b_data,
	2295	sizeof(struct allocExtDesc));
	2296	mark_buffer_dirty_inode(oepos.bh, inode);
	2297	}
	2298	} else {
	2299	udf_write_aext(inode, &oepos, &eloc, elen, 1);
	2300	if (!oepos.bh) {
	2301	iinfo->i_lenAlloc -= adsize;
	2302	mark_inode_dirty(inode);
	2303	} else {
	2304	aed = (struct allocExtDesc *)oepos.bh->b_data;
	2305	le32_add_cpu(&aed->lengthAllocDescs, -adsize);
	2306	if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) \|\|
	2307	UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
	2308	udf_update_tag(oepos.bh->b_data,
	2309	epos.offset - adsize);
	2310	else
	2311	udf_update_tag(oepos.bh->b_data,
	2312	sizeof(struct allocExtDesc));
	2313	mark_buffer_dirty_inode(oepos.bh, inode);
	2314	}
	2315	}
	2316
	2317	brelse(epos.bh);
	2318	brelse(oepos.bh);
	2319
	2320	return (elen >> 30);
	2321	}
	2322
	2323	int8_t inode_bmap(struct inode *inode, sector_t block,
	2324	struct extent_position pos, struct kernel_lb_addr eloc,
	2325	uint32_t elen, sector_t offset)
	2326	{
	2327	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
	2328	loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
	2329	int8_t etype;
	2330	struct udf_inode_info *iinfo;
	2331
	2332	iinfo = UDF_I(inode);
	2333	if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
	2334	pos->offset = 0;
	2335	pos->block = iinfo->i_location;
	2336	pos->bh = NULL;
	2337	}
	2338	*elen = 0;
	2339	do {
	2340	etype = udf_next_aext(inode, pos, eloc, elen, 1);
	2341	if (etype == -1) {
	2342	*offset = (bcount - lbcount) >> blocksize_bits;
	2343	iinfo->i_lenExtents = lbcount;
	2344	return -1;
	2345	}
	2346	lbcount += *elen;
	2347	} while (lbcount <= bcount);
	2348	/* update extent cache */
	2349	udf_update_extent_cache(inode, lbcount - *elen, pos);
	2350	offset = (bcount + elen - lbcount) >> blocksize_bits;
	2351
	2352	return etype;
	2353	}
	2354
	2355	udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
	2356	{
	2357	struct kernel_lb_addr eloc;
	2358	uint32_t elen;
	2359	sector_t offset;
	2360	struct extent_position epos = {};
	2361	udf_pblk_t ret;
	2362
	2363	down_read(&UDF_I(inode)->i_data_sem);
	2364
	2365	if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
	2366	(EXT_RECORDED_ALLOCATED >> 30))
	2367	ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
	2368	else
	2369	ret = 0;
	2370
	2371	up_read(&UDF_I(inode)->i_data_sem);
	2372	brelse(epos.bh);
	2373
	2374	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
	2375	return udf_fixed_to_variable(ret);
	2376	else
	2377	return ret;
	2378	}