[linux-block.git] / fs / adfs / dir_f.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/adfs/dir_f.c
 *
 * Copyright (C) 1997-1999 Russell King
 *
 *  E and F format directory handling
 */
#include "adfs.h"
#include "dir_f.h"

/*
 * Read an (unaligned) value of length 1..4 bytes
 */
static inline unsigned int adfs_readval(unsigned char *p, int len)
{
	unsigned int val = 0;

	switch (len) {
	case 4:		val |= p[3] << 24;
			/* fall through */
	case 3:		val |= p[2] << 16;
			/* fall through */
	case 2:		val |= p[1] << 8;
			/* fall through */
	default:	val |= p[0];
	}
	return val;
}

static inline void adfs_writeval(unsigned char *p, int len, unsigned int val)
{
	switch (len) {
	case 4:		p[3] = val >> 24;
			/* fall through */
	case 3:		p[2] = val >> 16;
			/* fall through */
	case 2:		p[1] = val >> 8;
			/* fall through */
	default:	p[0] = val;
	}
}

#define ror13(v) ((v >> 13) | (v << 19))

#define dir_u8(idx)				\
	({ int _buf = idx >> blocksize_bits;	\
	   int _off = idx - (_buf << blocksize_bits);\
	  *(u8 *)(bh[_buf]->b_data + _off);	\
	})

#define dir_u32(idx)				\
	({ int _buf = idx >> blocksize_bits;	\
	   int _off = idx - (_buf << blocksize_bits);\
	  *(__le32 *)(bh[_buf]->b_data + _off);	\
	})

#define bufoff(_bh,_idx)			\
	({ int _buf = _idx >> blocksize_bits;	\
	   int _off = _idx - (_buf << blocksize_bits);\
	  (u8 *)(_bh[_buf]->b_data + _off);	\
	})

/*
 * There are some algorithms that are nice in
 * assembler, but a bitch in C...  This is one
 * of them.
 */
static u8
adfs_dir_checkbyte(const struct adfs_dir *dir)
{
	struct buffer_head * const *bh = dir->bh;
	const int blocksize_bits = dir->sb->s_blocksize_bits;
	union { __le32 *ptr32; u8 *ptr8; } ptr, end;
	u32 dircheck = 0;
	int last = 5 - 26;
	int i = 0;

	/*
	 * Accumulate each word up to the last whole
	 * word of the last directory entry.  This
	 * can spread across several buffer heads.
	 */
	do {
		last += 26;
		do {
			dircheck = le32_to_cpu(dir_u32(i)) ^ ror13(dircheck);

			i += sizeof(u32);
		} while (i < (last & ~3));
	} while (dir_u8(last) != 0);

	/*
	 * Accumulate the last few bytes.  These
	 * bytes will be within the same bh.
	 */
	if (i != last) {
		ptr.ptr8 = bufoff(bh, i);
		end.ptr8 = ptr.ptr8 + last - i;

		do {
			dircheck = *ptr.ptr8++ ^ ror13(dircheck);
		} while (ptr.ptr8 < end.ptr8);
	}

	/*
	 * The directory tail is in the final bh
	 * Note that contary to the RISC OS PRMs,
	 * the first few bytes are NOT included
	 * in the check.  All bytes are in the
	 * same bh.
	 */
	ptr.ptr8 = bufoff(bh, 2008);
	end.ptr8 = ptr.ptr8 + 36;

	do {
		__le32 v = *ptr.ptr32++;
		dircheck = le32_to_cpu(v) ^ ror13(dircheck);
	} while (ptr.ptr32 < end.ptr32);

	return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
}

/* Read and check that a directory is valid */
static int adfs_dir_read(struct super_block *sb, u32 indaddr,
			 unsigned int size, struct adfs_dir *dir)
{
	const unsigned int blocksize_bits = sb->s_blocksize_bits;
	int ret;

	/*
	 * Directories which are not a multiple of 2048 bytes
	 * are considered bad v2 [3.6]
	 */
	if (size & 2047)
		goto bad_dir;

	ret = adfs_dir_read_buffers(sb, indaddr, size, dir);
	if (ret)
		return ret;

	memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
	memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));

	if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq ||
	    memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
		goto bad_dir;

	if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
	    memcmp(&dir->dirhead.startname, "Hugo", 4))
		goto bad_dir;

	if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
		goto bad_dir;

	return 0;

bad_dir:
	adfs_error(sb, "dir %06x is corrupted", indaddr);
	adfs_dir_relse(dir);

	return -EIO;
}

/*
 * convert a disk-based directory entry to a Linux ADFS directory entry
 */
static inline void
adfs_dir2obj(struct adfs_dir *dir, struct object_info *obj,
	struct adfs_direntry *de)
{
	unsigned int name_len;

	for (name_len = 0; name_len < ADFS_F_NAME_LEN; name_len++) {
		if (de->dirobname[name_len] < ' ')
			break;

		obj->name[name_len] = de->dirobname[name_len];
	}

	obj->name_len =	name_len;
	obj->indaddr  = adfs_readval(de->dirinddiscadd, 3);
	obj->loadaddr = adfs_readval(de->dirload, 4);
	obj->execaddr = adfs_readval(de->direxec, 4);
	obj->size     = adfs_readval(de->dirlen,  4);
	obj->attr     = de->newdiratts;

	adfs_object_fixup(dir, obj);
}

/*
 * convert a Linux ADFS directory entry to a disk-based directory entry
 */
static inline void
adfs_obj2dir(struct adfs_direntry *de, struct object_info *obj)
{
	adfs_writeval(de->dirinddiscadd, 3, obj->indaddr);
	adfs_writeval(de->dirload, 4, obj->loadaddr);
	adfs_writeval(de->direxec, 4, obj->execaddr);
	adfs_writeval(de->dirlen,  4, obj->size);
	de->newdiratts = obj->attr;
}

/*
 * get a directory entry.  Note that the caller is responsible
 * for holding the relevant locks.
 */
static int
__adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)
{
	struct adfs_direntry de;
	int ret;

	ret = adfs_dir_copyfrom(&de, dir, pos, 26);
	if (ret)
		return ret;

	if (!de.dirobname[0])
		return -ENOENT;

	adfs_dir2obj(dir, obj, &de);

	return 0;
}

static int
__adfs_dir_put(struct adfs_dir *dir, int pos, struct object_info *obj)
{
	struct adfs_direntry de;
	int ret;

	ret = adfs_dir_copyfrom(&de, dir, pos, 26);
	if (ret)
		return ret;

	adfs_obj2dir(&de, obj);

	return adfs_dir_copyto(dir, pos, &de, 26);
}

/*
 * the caller is responsible for holding the necessary
 * locks.
 */
static int adfs_dir_find_entry(struct adfs_dir *dir, u32 indaddr)
{
	int pos, ret;

	ret = -ENOENT;

	for (pos = 5; pos < ADFS_NUM_DIR_ENTRIES * 26 + 5; pos += 26) {
		struct object_info obj;

		if (!__adfs_dir_get(dir, pos, &obj))
			break;

		if (obj.indaddr == indaddr) {
			ret = pos;
			break;
		}
	}

	return ret;
}

static int adfs_f_read(struct super_block *sb, u32 indaddr, unsigned int size,
		       struct adfs_dir *dir)
{
	int ret;

	if (size != ADFS_NEWDIR_SIZE)
		return -EIO;

	ret = adfs_dir_read(sb, indaddr, size, dir);
	if (ret)
		adfs_error(sb, "unable to read directory");
	else
		dir->parent_id = adfs_readval(dir->dirtail.new.dirparent, 3);

	return ret;
}

static int
adfs_f_setpos(struct adfs_dir *dir, unsigned int fpos)
{
	if (fpos >= ADFS_NUM_DIR_ENTRIES)
		return -ENOENT;

	dir->pos = 5 + fpos * 26;
	return 0;
}

static int
adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj)
{
	unsigned int ret;

	ret = __adfs_dir_get(dir, dir->pos, obj);
	if (ret == 0)
		dir->pos += 26;

	return ret;
}

static int adfs_f_iterate(struct adfs_dir *dir, struct dir_context *ctx)
{
	struct object_info obj;
	int pos = 5 + (ctx->pos - 2) * 26;

	while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {
		if (__adfs_dir_get(dir, pos, &obj))
			break;
		if (!dir_emit(ctx, obj.name, obj.name_len,
			      obj.indaddr, DT_UNKNOWN))
			break;
		pos += 26;
		ctx->pos++;
	}
	return 0;
}

static int
adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
{
	struct super_block *sb = dir->sb;
	int ret;

	ret = adfs_dir_find_entry(dir, obj->indaddr);
	if (ret < 0) {
		adfs_error(dir->sb, "unable to locate entry to update");
		goto out;
	}

	__adfs_dir_put(dir, ret, obj);
 
	/*
	 * Increment directory sequence number
	 */
	dir->bh[0]->b_data[0] += 1;
	dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 6] += 1;

	ret = adfs_dir_checkbyte(dir);
	/*
	 * Update directory check byte
	 */
	dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 1] = ret;

#if 1
	{
	const unsigned int blocksize_bits = sb->s_blocksize_bits;

	memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
	memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));

	if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq ||
	    memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
		goto bad_dir;

	if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
	    memcmp(&dir->dirhead.startname, "Hugo", 4))
		goto bad_dir;

	if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
		goto bad_dir;
	}
#endif
	ret = 0;
out:
	return ret;
#if 1
bad_dir:
	adfs_error(dir->sb, "whoops!  I broke a directory!");
	return -EIO;
#endif
}

const struct adfs_dir_ops adfs_f_dir_ops = {
	.read		= adfs_f_read,
	.iterate	= adfs_f_iterate,
	.setpos		= adfs_f_setpos,
	.getnext	= adfs_f_getnext,
	.update		= adfs_f_update,
};
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* linux/fs/adfs/dir_f.c
	4	*
	5	* Copyright (C) 1997-1999 Russell King
	6	*
1da177e4 LT	7	* E and F format directory handling
1da177e4 LT	8	*/
1da177e4 LT	9	#include "adfs.h"
	10	#include "dir_f.h"
	11
1da177e4 LT	12	/*
	13	* Read an (unaligned) value of length 1..4 bytes
	14	*/
	15	static inline unsigned int adfs_readval(unsigned char *p, int len)
	16	{
	17	unsigned int val = 0;
	18
	19	switch (len) {
	20	case 4: val \|= p[3] << 24;
74f79099	21	/* fall through */
1da177e4	22	case 3: val \|= p[2] << 16;
74f79099	23	/* fall through */
1da177e4	24	case 2: val \|= p[1] << 8;
74f79099	25	/* fall through */
1da177e4 LT	26	default: val \|= p[0];
	27	}
	28	return val;
	29	}
	30
	31	static inline void adfs_writeval(unsigned char *p, int len, unsigned int val)
	32	{
	33	switch (len) {
	34	case 4: p[3] = val >> 24;
74f79099	35	/* fall through */
1da177e4	36	case 3: p[2] = val >> 16;
74f79099	37	/* fall through */
1da177e4	38	case 2: p[1] = val >> 8;
74f79099	39	/* fall through */
1da177e4 LT	40	default: p[0] = val;
	41	}
	42	}
	43
1da177e4 LT	44	#define ror13(v) ((v >> 13) \| (v << 19))
	45
	46	#define dir_u8(idx) \
	47	({ int _buf = idx >> blocksize_bits; \
	48	int _off = idx - (_buf << blocksize_bits);\
	49	(u8 )(bh[_buf]->b_data + _off); \
	50	})
	51
	52	#define dir_u32(idx) \
	53	({ int _buf = idx >> blocksize_bits; \
	54	int _off = idx - (_buf << blocksize_bits);\
	55	(__le32 )(bh[_buf]->b_data + _off); \
	56	})
	57
	58	#define bufoff(_bh,_idx) \
	59	({ int _buf = _idx >> blocksize_bits; \
	60	int _off = _idx - (_buf << blocksize_bits);\
	61	(u8 *)(_bh[_buf]->b_data + _off); \
	62	})
	63
	64	/*
	65	* There are some algorithms that are nice in
	66	* assembler, but a bitch in C... This is one
	67	* of them.
	68	*/
	69	static u8
	70	adfs_dir_checkbyte(const struct adfs_dir *dir)
	71	{
	72	struct buffer_head * const *bh = dir->bh;
	73	const int blocksize_bits = dir->sb->s_blocksize_bits;
	74	union { __le32 ptr32; u8 ptr8; } ptr, end;
	75	u32 dircheck = 0;
	76	int last = 5 - 26;
	77	int i = 0;
	78
	79	/*
	80	* Accumulate each word up to the last whole
	81	* word of the last directory entry. This
	82	* can spread across several buffer heads.
	83	*/
	84	do {
	85	last += 26;
	86	do {
	87	dircheck = le32_to_cpu(dir_u32(i)) ^ ror13(dircheck);
	88
	89	i += sizeof(u32);
	90	} while (i < (last & ~3));
	91	} while (dir_u8(last) != 0);
	92
	93	/*
	94	* Accumulate the last few bytes. These
	95	* bytes will be within the same bh.
	96	*/
	97	if (i != last) {
	98	ptr.ptr8 = bufoff(bh, i);
	99	end.ptr8 = ptr.ptr8 + last - i;
	100
e5949050	101	do {
1da177e4	102	dircheck = *ptr.ptr8++ ^ ror13(dircheck);
e5949050	103	} while (ptr.ptr8 < end.ptr8);
1da177e4 LT	104	}
	105
	106	/*
	107	* The directory tail is in the final bh
	108	* Note that contary to the RISC OS PRMs,
	109	* the first few bytes are NOT included
	110	* in the check. All bytes are in the
	111	* same bh.
	112	*/
	113	ptr.ptr8 = bufoff(bh, 2008);
	114	end.ptr8 = ptr.ptr8 + 36;
	115
	116	do {
	117	__le32 v = *ptr.ptr32++;
	118	dircheck = le32_to_cpu(v) ^ ror13(dircheck);
	119	} while (ptr.ptr32 < end.ptr32);
	120
	121	return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
	122	}
	123
5ed70bb4 RK	124	/* Read and check that a directory is valid */
	125	static int adfs_dir_read(struct super_block *sb, u32 indaddr,
	126	unsigned int size, struct adfs_dir *dir)
1da177e4 LT	127	{
1da177e4 LT	128	const unsigned int blocksize_bits = sb->s_blocksize_bits;
419a6e5e	129	int ret;
1da177e4 LT	130
	131	/*
	132	* Directories which are not a multiple of 2048 bytes
	133	* are considered bad v2 [3.6]
	134	*/
	135	if (size & 2047)
	136	goto bad_dir;
	137
419a6e5e RK	138	ret = adfs_dir_read_buffers(sb, indaddr, size, dir);
	139	if (ret)
	140	return ret;
1da177e4 LT	141
	142	memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
	143	memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));
	144
	145	if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq \|\|
	146	memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
	147	goto bad_dir;
	148
	149	if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
	150	memcmp(&dir->dirhead.startname, "Hugo", 4))
	151	goto bad_dir;
	152
	153	if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
	154	goto bad_dir;
	155
1da177e4 LT	156	return 0;
	157
	158	bad_dir:
5ed70bb4	159	adfs_error(sb, "dir %06x is corrupted", indaddr);
1dd9f5ba	160	adfs_dir_relse(dir);
1da177e4 LT	161
	162	return -EIO;
	163	}
	164
	165	/*
	166	* convert a disk-based directory entry to a Linux ADFS directory entry
	167	*/
	168	static inline void
da23ef05 SS	169	adfs_dir2obj(struct adfs_dir dir, struct object_info obj,
da23ef05 SS	170	struct adfs_direntry *de)
1da177e4	171	{
adb514a4 RK	172	unsigned int name_len;
	173
	174	for (name_len = 0; name_len < ADFS_F_NAME_LEN; name_len++) {
	175	if (de->dirobname[name_len] < ' ')
	176	break;
	177
	178	obj->name[name_len] = de->dirobname[name_len];
	179	}
	180
	181	obj->name_len = name_len;
5ed70bb4	182	obj->indaddr = adfs_readval(de->dirinddiscadd, 3);
1da177e4 LT	183	obj->loadaddr = adfs_readval(de->dirload, 4);
	184	obj->execaddr = adfs_readval(de->direxec, 4);
	185	obj->size = adfs_readval(de->dirlen, 4);
	186	obj->attr = de->newdiratts;
da23ef05	187
411c49bc	188	adfs_object_fixup(dir, obj);
1da177e4 LT	189	}
	190
	191	/*
	192	* convert a Linux ADFS directory entry to a disk-based directory entry
	193	*/
	194	static inline void
	195	adfs_obj2dir(struct adfs_direntry de, struct object_info obj)
	196	{
5ed70bb4	197	adfs_writeval(de->dirinddiscadd, 3, obj->indaddr);
1da177e4 LT	198	adfs_writeval(de->dirload, 4, obj->loadaddr);
	199	adfs_writeval(de->direxec, 4, obj->execaddr);
	200	adfs_writeval(de->dirlen, 4, obj->size);
	201	de->newdiratts = obj->attr;
	202	}
	203
	204	/*
	205	* get a directory entry. Note that the caller is responsible
	206	* for holding the relevant locks.
	207	*/
	208	static int
	209	__adfs_dir_get(struct adfs_dir dir, int pos, struct object_info obj)
	210	{
1da177e4	211	struct adfs_direntry de;
a317120b	212	int ret;
1da177e4	213
a317120b RK	214	ret = adfs_dir_copyfrom(&de, dir, pos, 26);
	215	if (ret)
	216	return ret;
1da177e4 LT	217
	218	if (!de.dirobname[0])
	219	return -ENOENT;
	220
da23ef05	221	adfs_dir2obj(dir, obj, &de);
1da177e4 LT	222
	223	return 0;
	224	}
	225
	226	static int
	227	__adfs_dir_put(struct adfs_dir dir, int pos, struct object_info obj)
	228	{
1da177e4	229	struct adfs_direntry de;
a317120b	230	int ret;
1da177e4	231
a317120b RK	232	ret = adfs_dir_copyfrom(&de, dir, pos, 26);
	233	if (ret)
	234	return ret;
1da177e4	235
1da177e4 LT	236	adfs_obj2dir(&de, obj);
1da177e4 LT	237
a317120b	238	return adfs_dir_copyto(dir, pos, &de, 26);
1da177e4 LT	239	}
	240
	241	/*
	242	* the caller is responsible for holding the necessary
	243	* locks.
	244	*/
5ed70bb4	245	static int adfs_dir_find_entry(struct adfs_dir *dir, u32 indaddr)
1da177e4 LT	246	{
	247	int pos, ret;
	248
	249	ret = -ENOENT;
	250
	251	for (pos = 5; pos < ADFS_NUM_DIR_ENTRIES * 26 + 5; pos += 26) {
	252	struct object_info obj;
	253
	254	if (!__adfs_dir_get(dir, pos, &obj))
	255	break;
	256
5ed70bb4	257	if (obj.indaddr == indaddr) {
1da177e4 LT	258	ret = pos;
	259	break;
	260	}
	261	}
	262
	263	return ret;
	264	}
	265
5ed70bb4 RK	266	static int adfs_f_read(struct super_block *sb, u32 indaddr, unsigned int size,
5ed70bb4 RK	267	struct adfs_dir *dir)
1da177e4 LT	268	{
	269	int ret;
	270
5ed70bb4	271	if (size != ADFS_NEWDIR_SIZE)
1da177e4 LT	272	return -EIO;
1da177e4 LT	273
5ed70bb4	274	ret = adfs_dir_read(sb, indaddr, size, dir);
1da177e4 LT	275	if (ret)
	276	adfs_error(sb, "unable to read directory");
	277	else
	278	dir->parent_id = adfs_readval(dir->dirtail.new.dirparent, 3);
	279
	280	return ret;
	281	}
	282
	283	static int
	284	adfs_f_setpos(struct adfs_dir *dir, unsigned int fpos)
	285	{
	286	if (fpos >= ADFS_NUM_DIR_ENTRIES)
	287	return -ENOENT;
	288
	289	dir->pos = 5 + fpos * 26;
	290	return 0;
	291	}
	292
	293	static int
	294	adfs_f_getnext(struct adfs_dir dir, struct object_info obj)
	295	{
	296	unsigned int ret;
	297
	298	ret = __adfs_dir_get(dir, dir->pos, obj);
	299	if (ret == 0)
	300	dir->pos += 26;
	301
	302	return ret;
	303	}
	304
4287e4de RK	305	static int adfs_f_iterate(struct adfs_dir dir, struct dir_context ctx)
	306	{
	307	struct object_info obj;
	308	int pos = 5 + (ctx->pos - 2) * 26;
	309
	310	while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {
	311	if (__adfs_dir_get(dir, pos, &obj))
	312	break;
	313	if (!dir_emit(ctx, obj.name, obj.name_len,
	314	obj.indaddr, DT_UNKNOWN))
	315	break;
	316	pos += 26;
	317	ctx->pos++;
	318	}
	319	return 0;
	320	}
	321
1da177e4 LT	322	static int
	323	adfs_f_update(struct adfs_dir dir, struct object_info obj)
	324	{
	325	struct super_block *sb = dir->sb;
c3c8149b	326	int ret;
1da177e4	327
5ed70bb4	328	ret = adfs_dir_find_entry(dir, obj->indaddr);
1da177e4 LT	329	if (ret < 0) {
	330	adfs_error(dir->sb, "unable to locate entry to update");
	331	goto out;
	332	}
	333
	334	__adfs_dir_put(dir, ret, obj);
	335
	336	/*
	337	* Increment directory sequence number
	338	*/
	339	dir->bh[0]->b_data[0] += 1;
	340	dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 6] += 1;
	341
	342	ret = adfs_dir_checkbyte(dir);
	343	/*
	344	* Update directory check byte
	345	*/
	346	dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 1] = ret;
	347
	348	#if 1
	349	{
	350	const unsigned int blocksize_bits = sb->s_blocksize_bits;
	351
	352	memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
	353	memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));
	354
	355	if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq \|\|
	356	memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
	357	goto bad_dir;
	358
	359	if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
	360	memcmp(&dir->dirhead.startname, "Hugo", 4))
	361	goto bad_dir;
	362
	363	if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
	364	goto bad_dir;
	365	}
	366	#endif
1da177e4 LT	367	ret = 0;
	368	out:
	369	return ret;
	370	#if 1
	371	bad_dir:
	372	adfs_error(dir->sb, "whoops! I broke a directory!");
	373	return -EIO;
	374	#endif
	375	}
	376
0125f504	377	const struct adfs_dir_ops adfs_f_dir_ops = {
1da177e4	378	.read = adfs_f_read,
4287e4de	379	.iterate = adfs_f_iterate,
1da177e4 LT	380	.setpos = adfs_f_setpos,
	381	.getnext = adfs_f_getnext,
	382	.update = adfs_f_update,
1da177e4	383	};