[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / udf / directory.c

/*
 * directory.c
 *
 * PURPOSE
 *	Directory related functions
 *
 * 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.
 */

#include "udfdecl.h"
#include "udf_i.h"

#include <linux/fs.h>
#include <linux/string.h>
#include <linux/buffer_head.h>

#if 0
static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad,
				uint8_t ad_size, kernel_lb_addr fe_loc,
				int *pos, int *offset, struct buffer_head **bh,
				int *error)
{
	int loffset = *offset;
	int block;
	uint8_t *ad;
	int remainder;

	*error = 0;

	ad = (uint8_t *)(*bh)->b_data + *offset;
	*offset += ad_size;

	if (!ad) {
		brelse(*bh);
		*error = 1;
		return NULL;
	}

	if (*offset == dir->i_sb->s_blocksize) {
		brelse(*bh);
		block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
		if (!block)
			return NULL;
		*bh = udf_tread(dir->i_sb, block);
		if (!*bh)
			return NULL;
	} else if (*offset > dir->i_sb->s_blocksize) {
		ad = tmpad;

		remainder = dir->i_sb->s_blocksize - loffset;
		memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);

		brelse(*bh);
		block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
		if (!block)
			return NULL;
		(*bh) = udf_tread(dir->i_sb, block);
		if (!*bh)
			return NULL;

		memcpy((uint8_t *)ad + remainder, (*bh)->b_data,
			ad_size - remainder);
		*offset = ad_size - remainder;
	}

	return ad;
}
#endif

struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
					 struct udf_fileident_bh *fibh,
					 struct fileIdentDesc *cfi,
					 struct extent_position *epos,
					 kernel_lb_addr *eloc, uint32_t *elen,
					 sector_t *offset)
{
	struct fileIdentDesc *fi;
	int i, num, block;
	struct buffer_head *tmp, *bha[16];
	struct udf_inode_info *iinfo = UDF_I(dir);

	fibh->soffset = fibh->eoffset;

	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
		fi = udf_get_fileident(iinfo->i_ext.i_data -
				       (iinfo->i_efe ?
					sizeof(struct extendedFileEntry) :
					sizeof(struct fileEntry)),
				       dir->i_sb->s_blocksize,
				       &(fibh->eoffset));
		if (!fi)
			return NULL;

		*nf_pos += fibh->eoffset - fibh->soffset;

		memcpy((uint8_t *)cfi, (uint8_t *)fi,
		       sizeof(struct fileIdentDesc));

		return fi;
	}

	if (fibh->eoffset == dir->i_sb->s_blocksize) {
		int lextoffset = epos->offset;
		unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;

		if (udf_next_aext(dir, epos, eloc, elen, 1) !=
		    (EXT_RECORDED_ALLOCATED >> 30))
			return NULL;

		block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);

		(*offset)++;

		if ((*offset << blocksize_bits) >= *elen)
			*offset = 0;
		else
			epos->offset = lextoffset;

		brelse(fibh->sbh);
		fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
		if (!fibh->sbh)
			return NULL;
		fibh->soffset = fibh->eoffset = 0;

		if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
			i = 16 >> (blocksize_bits - 9);
			if (i + *offset > (*elen >> blocksize_bits))
				i = (*elen >> blocksize_bits)-*offset;
			for (num = 0; i > 0; i--) {
				block = udf_get_lb_pblock(dir->i_sb, *eloc,
							  *offset + i);
				tmp = udf_tgetblk(dir->i_sb, block);
				if (tmp && !buffer_uptodate(tmp) &&
						!buffer_locked(tmp))
					bha[num++] = tmp;
				else
					brelse(tmp);
			}
			if (num) {
				ll_rw_block(READA, num, bha);
				for (i = 0; i < num; i++)
					brelse(bha[i]);
			}
		}
	} else if (fibh->sbh != fibh->ebh) {
		brelse(fibh->sbh);
		fibh->sbh = fibh->ebh;
	}

	fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
			       &(fibh->eoffset));

	if (!fi)
		return NULL;

	*nf_pos += fibh->eoffset - fibh->soffset;

	if (fibh->eoffset <= dir->i_sb->s_blocksize) {
		memcpy((uint8_t *)cfi, (uint8_t *)fi,
		       sizeof(struct fileIdentDesc));
	} else if (fibh->eoffset > dir->i_sb->s_blocksize) {
		int lextoffset = epos->offset;

		if (udf_next_aext(dir, epos, eloc, elen, 1) !=
		    (EXT_RECORDED_ALLOCATED >> 30))
			return NULL;

		block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);

		(*offset)++;

		if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
			*offset = 0;
		else
			epos->offset = lextoffset;

		fibh->soffset -= dir->i_sb->s_blocksize;
		fibh->eoffset -= dir->i_sb->s_blocksize;

		fibh->ebh = udf_tread(dir->i_sb, block);
		if (!fibh->ebh)
			return NULL;

		if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
			int fi_len;

			memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset);
			memcpy((uint8_t *)cfi - fibh->soffset,
			       fibh->ebh->b_data,
			       sizeof(struct fileIdentDesc) + fibh->soffset);

			fi_len = (sizeof(struct fileIdentDesc) +
				  cfi->lengthFileIdent +
				  le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;

			*nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
			fibh->eoffset = fibh->soffset + fi_len;
		} else {
			memcpy((uint8_t *)cfi, (uint8_t *)fi,
			       sizeof(struct fileIdentDesc));
		}
	}
	return fi;
}

struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset)
{
	struct fileIdentDesc *fi;
	int lengthThisIdent;
	uint8_t *ptr;
	int padlen;

	if ((!buffer) || (!offset)) {
		udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer,
			  offset);
		return NULL;
	}

	ptr = buffer;

	if ((*offset > 0) && (*offset < bufsize))
		ptr += *offset;
	fi = (struct fileIdentDesc *)ptr;
	if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
		udf_debug("0x%x != TAG_IDENT_FID\n",
			  le16_to_cpu(fi->descTag.tagIdent));
		udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
			  *offset, (unsigned long)sizeof(struct fileIdentDesc),
			  bufsize);
		return NULL;
	}
	if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
		lengthThisIdent = sizeof(struct fileIdentDesc);
	else
		lengthThisIdent = sizeof(struct fileIdentDesc) +
			fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);

	/* we need to figure padding, too! */
	padlen = lengthThisIdent % UDF_NAME_PAD;
	if (padlen)
		lengthThisIdent += (UDF_NAME_PAD - padlen);
	*offset = *offset + lengthThisIdent;

	return fi;
}

#if 0
static extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset)
{
	extent_ad *ext;
	struct fileEntry *fe;
	uint8_t *ptr;

	if ((!buffer) || (!offset)) {
		printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
		return NULL;
	}

	fe = (struct fileEntry *)buffer;

	if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) {
		udf_debug("0x%x != TAG_IDENT_FE\n",
			  le16_to_cpu(fe->descTag.tagIdent));
		return NULL;
	}

	ptr = (uint8_t *)(fe->extendedAttr) +
		le32_to_cpu(fe->lengthExtendedAttr);

	if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)))
		ptr += *offset;

	ext = (extent_ad *)ptr;

	*offset = *offset + sizeof(extent_ad);
	return ext;
}
#endif

short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
			      int inc)
{
	short_ad *sa;

	if ((!ptr) || (!offset)) {
		printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
		return NULL;
	}

	if ((*offset + sizeof(short_ad)) > maxoffset)
		return NULL;
	else {
		sa = (short_ad *)ptr;
		if (sa->extLength == 0)
			return NULL;
	}

	if (inc)
		*offset += sizeof(short_ad);
	return sa;
}

long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
{
	long_ad *la;

	if ((!ptr) || (!offset)) {
		printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
		return NULL;
	}

	if ((*offset + sizeof(long_ad)) > maxoffset)
		return NULL;
	else {
		la = (long_ad *)ptr;
		if (la->extLength == 0)
			return NULL;
	}

	if (inc)
		*offset += sizeof(long_ad);
	return la;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* directory.c
	3	*
	4	* PURPOSE
	5	* Directory related functions
	6	*
1da177e4 LT	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
	14	#include "udfdecl.h"
	15	#include "udf_i.h"
	16
	17	#include <linux/fs.h>
	18	#include <linux/string.h>
	19	#include <linux/buffer_head.h>
	20
	21	#if 0
4b11111a	22	static uint8_t udf_filead_read(struct inode dir, uint8_t *tmpad,
cb00ea35 CG	23	uint8_t ad_size, kernel_lb_addr fe_loc,
	24	int pos, int offset, struct buffer_head **bh,
	25	int *error)
1da177e4 LT	26	{
	27	int loffset = *offset;
	28	int block;
	29	uint8_t *ad;
	30	int remainder;
	31
	32	*error = 0;
	33
28de7948	34	ad = (uint8_t )(bh)->b_data + *offset;
1da177e4 LT	35	*offset += ad_size;
1da177e4 LT	36
cb00ea35	37	if (!ad) {
3bf25cb4	38	brelse(*bh);
1da177e4 LT	39	*error = 1;
	40	return NULL;
	41	}
	42
cb00ea35	43	if (*offset == dir->i_sb->s_blocksize) {
3bf25cb4	44	brelse(*bh);
1da177e4 LT	45	block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
	46	if (!block)
	47	return NULL;
4b11111a MS	48	*bh = udf_tread(dir->i_sb, block);
4b11111a MS	49	if (!*bh)
1da177e4	50	return NULL;
cb00ea35	51	} else if (*offset > dir->i_sb->s_blocksize) {
1da177e4 LT	52	ad = tmpad;
	53
	54	remainder = dir->i_sb->s_blocksize - loffset;
28de7948	55	memcpy((uint8_t )ad, (bh)->b_data + loffset, remainder);
1da177e4	56
3bf25cb4	57	brelse(*bh);
1da177e4 LT	58	block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
	59	if (!block)
	60	return NULL;
4b11111a MS	61	(*bh) = udf_tread(dir->i_sb, block);
4b11111a MS	62	if (!*bh)
1da177e4 LT	63	return NULL;
1da177e4 LT	64
4b11111a MS	65	memcpy((uint8_t )ad + remainder, (bh)->b_data,
4b11111a MS	66	ad_size - remainder);
1da177e4 LT	67	*offset = ad_size - remainder;
1da177e4 LT	68	}
28de7948	69
1da177e4 LT	70	return ad;
	71	}
	72	#endif
	73
4b11111a	74	struct fileIdentDesc udf_fileident_read(struct inode dir, loff_t *nf_pos,
cb00ea35 CG	75	struct udf_fileident_bh *fibh,
	76	struct fileIdentDesc *cfi,
	77	struct extent_position *epos,
4b11111a MS	78	kernel_lb_addr eloc, uint32_t elen,
4b11111a MS	79	sector_t *offset)
1da177e4 LT	80	{
	81	struct fileIdentDesc *fi;
	82	int i, num, block;
cb00ea35	83	struct buffer_head tmp, bha[16];
48d6d8ff	84	struct udf_inode_info *iinfo = UDF_I(dir);
1da177e4 LT	85
	86	fibh->soffset = fibh->eoffset;
	87
48d6d8ff MS	88	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
	89	fi = udf_get_fileident(iinfo->i_ext.i_data -
	90	(iinfo->i_efe ?
cb00ea35 CG	91	sizeof(struct extendedFileEntry) :
cb00ea35 CG	92	sizeof(struct fileEntry)),
4b11111a MS	93	dir->i_sb->s_blocksize,
4b11111a MS	94	&(fibh->eoffset));
1da177e4 LT	95	if (!fi)
	96	return NULL;
	97
af793295	98	*nf_pos += fibh->eoffset - fibh->soffset;
1da177e4	99
28de7948	100	memcpy((uint8_t )cfi, (uint8_t )fi,
cb00ea35	101	sizeof(struct fileIdentDesc));
1da177e4 LT	102
	103	return fi;
	104	}
	105
cb00ea35	106	if (fibh->eoffset == dir->i_sb->s_blocksize) {
ff116fc8	107	int lextoffset = epos->offset;
4b11111a	108	unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
1da177e4	109
ff116fc8	110	if (udf_next_aext(dir, epos, eloc, elen, 1) !=
cb00ea35	111	(EXT_RECORDED_ALLOCATED >> 30))
1da177e4	112	return NULL;
1da177e4 LT	113
	114	block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
	115
cb00ea35	116	(*offset)++;
1da177e4	117
4b11111a	118	if ((offset << blocksize_bits) >= elen)
1da177e4 LT	119	*offset = 0;
1da177e4 LT	120	else
ff116fc8	121	epos->offset = lextoffset;
1da177e4	122
3bf25cb4	123	brelse(fibh->sbh);
4b11111a MS	124	fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
4b11111a MS	125	if (!fibh->sbh)
1da177e4 LT	126	return NULL;
	127	fibh->soffset = fibh->eoffset = 0;
	128
4b11111a MS	129	if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
	130	i = 16 >> (blocksize_bits - 9);
	131	if (i + offset > (elen >> blocksize_bits))
	132	i = (elen >> blocksize_bits)-offset;
cb00ea35	133	for (num = 0; i > 0; i--) {
4b11111a MS	134	block = udf_get_lb_pblock(dir->i_sb, *eloc,
4b11111a MS	135	*offset + i);
1da177e4	136	tmp = udf_tgetblk(dir->i_sb, block);
4b11111a MS	137	if (tmp && !buffer_uptodate(tmp) &&
4b11111a MS	138	!buffer_locked(tmp))
1da177e4 LT	139	bha[num++] = tmp;
	140	else
	141	brelse(tmp);
	142	}
cb00ea35	143	if (num) {
1da177e4	144	ll_rw_block(READA, num, bha);
cb00ea35	145	for (i = 0; i < num; i++)
1da177e4 LT	146	brelse(bha[i]);
	147	}
	148	}
cb00ea35	149	} else if (fibh->sbh != fibh->ebh) {
3bf25cb4	150	brelse(fibh->sbh);
1da177e4 LT	151	fibh->sbh = fibh->ebh;
	152	}
	153
	154	fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
cb00ea35	155	&(fibh->eoffset));
1da177e4 LT	156
	157	if (!fi)
	158	return NULL;
	159
af793295	160	*nf_pos += fibh->eoffset - fibh->soffset;
1da177e4	161
cb00ea35	162	if (fibh->eoffset <= dir->i_sb->s_blocksize) {
28de7948	163	memcpy((uint8_t )cfi, (uint8_t )fi,
cb00ea35 CG	164	sizeof(struct fileIdentDesc));
cb00ea35 CG	165	} else if (fibh->eoffset > dir->i_sb->s_blocksize) {
ff116fc8	166	int lextoffset = epos->offset;
1da177e4	167
ff116fc8	168	if (udf_next_aext(dir, epos, eloc, elen, 1) !=
cb00ea35	169	(EXT_RECORDED_ALLOCATED >> 30))
1da177e4	170	return NULL;
1da177e4 LT	171
	172	block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
	173
cb00ea35	174	(*offset)++;
1da177e4 LT	175
	176	if ((offset << dir->i_sb->s_blocksize_bits) >= elen)
	177	*offset = 0;
	178	else
ff116fc8	179	epos->offset = lextoffset;
1da177e4 LT	180
	181	fibh->soffset -= dir->i_sb->s_blocksize;
	182	fibh->eoffset -= dir->i_sb->s_blocksize;
	183
4b11111a MS	184	fibh->ebh = udf_tread(dir->i_sb, block);
4b11111a MS	185	if (!fibh->ebh)
1da177e4 LT	186	return NULL;
1da177e4 LT	187
cb00ea35	188	if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
1da177e4 LT	189	int fi_len;
1da177e4 LT	190
28de7948	191	memcpy((uint8_t )cfi, (uint8_t )fi, -fibh->soffset);
4b11111a MS	192	memcpy((uint8_t *)cfi - fibh->soffset,
4b11111a MS	193	fibh->ebh->b_data,
cb00ea35	194	sizeof(struct fileIdentDesc) + fibh->soffset);
1da177e4	195
4b11111a MS	196	fi_len = (sizeof(struct fileIdentDesc) +
4b11111a MS	197	cfi->lengthFileIdent +
28de7948	198	le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
1da177e4	199
af793295	200	*nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
1da177e4	201	fibh->eoffset = fibh->soffset + fi_len;
cb00ea35	202	} else {
28de7948	203	memcpy((uint8_t )cfi, (uint8_t )fi,
cb00ea35	204	sizeof(struct fileIdentDesc));
1da177e4 LT	205	}
	206	}
	207	return fi;
	208	}
	209
cb00ea35	210	struct fileIdentDesc udf_get_fileident(void buffer, int bufsize, int *offset)
1da177e4 LT	211	{
	212	struct fileIdentDesc *fi;
	213	int lengthThisIdent;
cb00ea35	214	uint8_t *ptr;
1da177e4 LT	215	int padlen;
1da177e4 LT	216
cb00ea35 CG	217	if ((!buffer) \|\| (!offset)) {
	218	udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer,
	219	offset);
1da177e4 LT	220	return NULL;
	221	}
	222
	223	ptr = buffer;
	224
4b11111a	225	if ((offset > 0) && (offset < bufsize))
1da177e4	226	ptr += *offset;
cb00ea35	227	fi = (struct fileIdentDesc *)ptr;
5e0f0017	228	if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
1da177e4	229	udf_debug("0x%x != TAG_IDENT_FID\n",
cb00ea35	230	le16_to_cpu(fi->descTag.tagIdent));
1da177e4	231	udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
cb00ea35 CG	232	*offset, (unsigned long)sizeof(struct fileIdentDesc),
cb00ea35 CG	233	bufsize);
1da177e4 LT	234	return NULL;
1da177e4 LT	235	}
4b11111a	236	if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
1da177e4	237	lengthThisIdent = sizeof(struct fileIdentDesc);
4b11111a	238	else
1da177e4	239	lengthThisIdent = sizeof(struct fileIdentDesc) +
28de7948	240	fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
1da177e4 LT	241
	242	/* we need to figure padding, too! */
	243	padlen = lengthThisIdent % UDF_NAME_PAD;
	244	if (padlen)
	245	lengthThisIdent += (UDF_NAME_PAD - padlen);
	246	offset = offset + lengthThisIdent;
	247
	248	return fi;
	249	}
	250
	251	#if 0
cb00ea35	252	static extent_ad udf_get_fileextent(void buffer, int bufsize, int *offset)
1da177e4	253	{
cb00ea35	254	extent_ad *ext;
1da177e4	255	struct fileEntry *fe;
cb00ea35	256	uint8_t *ptr;
1da177e4	257
cb00ea35	258	if ((!buffer) \|\| (!offset)) {
1da177e4 LT	259	printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
	260	return NULL;
	261	}
	262
	263	fe = (struct fileEntry *)buffer;
	264
5e0f0017	265	if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) {
1da177e4	266	udf_debug("0x%x != TAG_IDENT_FE\n",
cb00ea35	267	le16_to_cpu(fe->descTag.tagIdent));
1da177e4 LT	268	return NULL;
	269	}
	270
4b11111a MS	271	ptr = (uint8_t *)(fe->extendedAttr) +
4b11111a MS	272	le32_to_cpu(fe->lengthExtendedAttr);
1da177e4	273
4b11111a	274	if ((offset > 0) && (offset < le32_to_cpu(fe->lengthAllocDescs)))
1da177e4	275	ptr += *offset;
1da177e4	276
28de7948	277	ext = (extent_ad *)ptr;
1da177e4 LT	278
	279	offset = offset + sizeof(extent_ad);
	280	return ext;
	281	}
	282	#endif
	283
1ed16171	284	short_ad udf_get_fileshortad(uint8_t ptr, int maxoffset, uint32_t *offset,
cb00ea35	285	int inc)
1da177e4 LT	286	{
	287	short_ad *sa;
	288
cb00ea35	289	if ((!ptr) \|\| (!offset)) {
1da177e4 LT	290	printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
	291	return NULL;
	292	}
	293
1ed16171	294	if ((*offset + sizeof(short_ad)) > maxoffset)
1da177e4	295	return NULL;
4b11111a MS	296	else {
	297	sa = (short_ad *)ptr;
	298	if (sa->extLength == 0)
	299	return NULL;
	300	}
1da177e4 LT	301
	302	if (inc)
	303	*offset += sizeof(short_ad);
	304	return sa;
	305	}
	306
1ed16171	307	long_ad udf_get_filelongad(uint8_t ptr, int maxoffset, uint32_t *offset, int inc)
1da177e4 LT	308	{
	309	long_ad *la;
	310
cb00ea35	311	if ((!ptr) \|\| (!offset)) {
1da177e4 LT	312	printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
	313	return NULL;
	314	}
	315
1ed16171	316	if ((*offset + sizeof(long_ad)) > maxoffset)
1da177e4	317	return NULL;
4b11111a MS	318	else {
	319	la = (long_ad *)ptr;
	320	if (la->extLength == 0)
	321	return NULL;
	322	}
1da177e4 LT	323
	324	if (inc)
	325	*offset += sizeof(long_ad);
	326	return la;
	327	}