[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / fs / udf / misc.c

/*
 * misc.c
 *
 * PURPOSE
 *	Miscellaneous routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *	This file is distributed under the terms of the GNU General Public
 *	License (GPL). Copies of the GPL can be obtained from:
 *		ftp://prep.ai.mit.edu/pub/gnu/GPL
 *	Each contributing author retains all rights to their own work.
 *
 *  (C) 1998 Dave Boynton
 *  (C) 1998-2004 Ben Fennema
 *  (C) 1999-2000 Stelias Computing Inc
 *
 * HISTORY
 *
 *  04/19/99 blf  partial support for reading/writing specific EA's
 */

#include "udfdecl.h"

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

#include "udf_i.h"
#include "udf_sb.h"

struct buffer_head *
udf_tgetblk(struct super_block *sb, int block)
{
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
		return sb_getblk(sb, udf_fixed_to_variable(block));
	else
		return sb_getblk(sb, block);
}

struct buffer_head *
udf_tread(struct super_block *sb, int block)
{
	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
		return sb_bread(sb, udf_fixed_to_variable(block));
	else
		return sb_bread(sb, block);
}

struct genericFormat *
udf_add_extendedattr(struct inode * inode, uint32_t size, uint32_t type,
	uint8_t loc)
{
	uint8_t *ea = NULL, *ad = NULL;
	int offset;
	uint16_t crclen;
	int i;

	ea = UDF_I_DATA(inode);
	if (UDF_I_LENEATTR(inode))
		ad = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
	else
	{
		ad = ea;
		size += sizeof(struct extendedAttrHeaderDesc);
	}

	offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) -
		UDF_I_LENALLOC(inode);

	/* TODO - Check for FreeEASpace */

	if (loc & 0x01 && offset >= size)
	{
		struct extendedAttrHeaderDesc *eahd;
		eahd = (struct extendedAttrHeaderDesc *)ea;

		if (UDF_I_LENALLOC(inode))
		{
			memmove(&ad[size], ad, UDF_I_LENALLOC(inode));
		}

		if (UDF_I_LENEATTR(inode))
		{
			/* check checksum/crc */
			if (le16_to_cpu(eahd->descTag.tagIdent) != TAG_IDENT_EAHD ||
				le32_to_cpu(eahd->descTag.tagLocation) != UDF_I_LOCATION(inode).logicalBlockNum)
			{
				return NULL;
			}
		}
		else
		{
			size -= sizeof(struct extendedAttrHeaderDesc);
			UDF_I_LENEATTR(inode) += sizeof(struct extendedAttrHeaderDesc);
			eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD);
			if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
				eahd->descTag.descVersion = cpu_to_le16(3);
			else
				eahd->descTag.descVersion = cpu_to_le16(2);
			eahd->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
			eahd->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
			eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF);
			eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF);
		}

		offset = UDF_I_LENEATTR(inode);
		if (type < 2048)
		{
			if (le32_to_cpu(eahd->appAttrLocation) < UDF_I_LENEATTR(inode))
			{
				uint32_t aal = le32_to_cpu(eahd->appAttrLocation);
				memmove(&ea[offset - aal + size],
					&ea[aal], offset - aal);
				offset -= aal;
				eahd->appAttrLocation = cpu_to_le32(aal + size);
			}
			if (le32_to_cpu(eahd->impAttrLocation) < UDF_I_LENEATTR(inode))
			{
				uint32_t ial = le32_to_cpu(eahd->impAttrLocation);
				memmove(&ea[offset - ial + size],
					&ea[ial], offset - ial);
				offset -= ial;
				eahd->impAttrLocation = cpu_to_le32(ial + size);
			}
		}
		else if (type < 65536)
		{
			if (le32_to_cpu(eahd->appAttrLocation) < UDF_I_LENEATTR(inode))
			{
				uint32_t aal = le32_to_cpu(eahd->appAttrLocation);
				memmove(&ea[offset - aal + size],
					&ea[aal], offset - aal);
				offset -= aal;
				eahd->appAttrLocation = cpu_to_le32(aal + size);
			}
		}
		/* rewrite CRC + checksum of eahd */
		crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag);
		eahd->descTag.descCRCLength = cpu_to_le16(crclen);
		eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd + sizeof(tag), crclen, 0));
		eahd->descTag.tagChecksum = 0;
		for (i=0; i<16; i++)
			if (i != 4)
				eahd->descTag.tagChecksum += ((uint8_t *)&(eahd->descTag))[i];
		UDF_I_LENEATTR(inode) += size;
		return (struct genericFormat *)&ea[offset];
	}
	if (loc & 0x02)
	{
	}
	return NULL;
}

struct genericFormat *
udf_get_extendedattr(struct inode *inode, uint32_t type, uint8_t subtype)
{
	struct genericFormat *gaf;
	uint8_t *ea = NULL;
	uint32_t offset;

	ea = UDF_I_DATA(inode);

	if (UDF_I_LENEATTR(inode))
	{
		struct extendedAttrHeaderDesc *eahd;
		eahd = (struct extendedAttrHeaderDesc *)ea;

		/* check checksum/crc */
		if (le16_to_cpu(eahd->descTag.tagIdent) != TAG_IDENT_EAHD ||
			le32_to_cpu(eahd->descTag.tagLocation) != UDF_I_LOCATION(inode).logicalBlockNum)
		{
			return NULL;
		}
	
		if (type < 2048)
			offset = sizeof(struct extendedAttrHeaderDesc);
		else if (type < 65536)
			offset = le32_to_cpu(eahd->impAttrLocation);
		else
			offset = le32_to_cpu(eahd->appAttrLocation);

		while (offset < UDF_I_LENEATTR(inode))
		{
			gaf = (struct genericFormat *)&ea[offset];
			if (le32_to_cpu(gaf->attrType) == type && gaf->attrSubtype == subtype)
				return gaf;
			else
				offset += le32_to_cpu(gaf->attrLength);
		}
	}
	return NULL;
}

/*
 * udf_read_tagged
 *
 * PURPOSE
 *	Read the first block of a tagged descriptor.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */
struct buffer_head *
udf_read_tagged(struct super_block *sb, uint32_t block, uint32_t location, uint16_t *ident)
{
	tag *tag_p;
	struct buffer_head *bh = NULL;
	register uint8_t checksum;
	register int i;

	/* Read the block */
	if (block == 0xFFFFFFFF)
		return NULL;

	bh = udf_tread(sb, block + UDF_SB_SESSION(sb));
	if (!bh)
	{
		udf_debug("block=%d, location=%d: read failed\n", block + UDF_SB_SESSION(sb), location);
		return NULL;
	}

	tag_p = (tag *)(bh->b_data);

	*ident = le16_to_cpu(tag_p->tagIdent);

	if ( location != le32_to_cpu(tag_p->tagLocation) )
	{
		udf_debug("location mismatch block %u, tag %u != %u\n",
			block + UDF_SB_SESSION(sb), le32_to_cpu(tag_p->tagLocation), location);
		goto error_out;
	}
	
	/* Verify the tag checksum */
	checksum = 0U;
	for (i = 0; i < 4; i++)
		checksum += (uint8_t)(bh->b_data[i]);
	for (i = 5; i < 16; i++)
		checksum += (uint8_t)(bh->b_data[i]);
	if (checksum != tag_p->tagChecksum) {
		printk(KERN_ERR "udf: tag checksum failed block %d\n", block);
		goto error_out;
	}

	/* Verify the tag version */
	if (le16_to_cpu(tag_p->descVersion) != 0x0002U &&
		le16_to_cpu(tag_p->descVersion) != 0x0003U)
	{
		udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n",
			le16_to_cpu(tag_p->descVersion), block);
		goto error_out;
	}

	/* Verify the descriptor CRC */
	if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize ||
		le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag),
			le16_to_cpu(tag_p->descCRCLength), 0))
	{
		return bh;
	}
	udf_debug("Crc failure block %d: crc = %d, crclen = %d\n",
		block + UDF_SB_SESSION(sb), le16_to_cpu(tag_p->descCRC), le16_to_cpu(tag_p->descCRCLength));

error_out:
	brelse(bh);
	return NULL;
}

struct buffer_head *
udf_read_ptagged(struct super_block *sb, kernel_lb_addr loc, uint32_t offset, uint16_t *ident)
{
	return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset),
		loc.logicalBlockNum + offset, ident);
}

void udf_update_tag(char *data, int length)
{
	tag *tptr = (tag *)data;
	int i;

	length -= sizeof(tag);

	tptr->tagChecksum = 0;
	tptr->descCRCLength = cpu_to_le16(length);
	tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0));

	for (i=0; i<16; i++)
		if (i != 4)
			tptr->tagChecksum += (uint8_t)(data[i]);
}

void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum,
	uint32_t loc, int length)
{
	tag *tptr = (tag *)data;
	tptr->tagIdent = cpu_to_le16(ident);
	tptr->descVersion = cpu_to_le16(version);
	tptr->tagSerialNum = cpu_to_le16(snum);
	tptr->tagLocation = cpu_to_le32(loc);
	udf_update_tag(data, length);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* misc.c
	3	*
	4	* PURPOSE
	5	* Miscellaneous routines for the OSTA-UDF(tm) filesystem.
	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	* (C) 1998 Dave Boynton
	14	* (C) 1998-2004 Ben Fennema
	15	* (C) 1999-2000 Stelias Computing Inc
	16	*
	17	* HISTORY
	18	*
	19	* 04/19/99 blf partial support for reading/writing specific EA's
	20	*/
	21
	22	#include "udfdecl.h"
	23
	24	#include <linux/fs.h>
	25	#include <linux/string.h>
	26	#include <linux/udf_fs.h>
	27	#include <linux/buffer_head.h>
	28
	29	#include "udf_i.h"
	30	#include "udf_sb.h"
	31
	32	struct buffer_head *
	33	udf_tgetblk(struct super_block *sb, int block)
	34	{
	35	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
	36	return sb_getblk(sb, udf_fixed_to_variable(block));
	37	else
	38	return sb_getblk(sb, block);
	39	}
	40
	41	struct buffer_head *
	42	udf_tread(struct super_block *sb, int block)
	43	{
	44	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
	45	return sb_bread(sb, udf_fixed_to_variable(block));
	46	else
	47	return sb_bread(sb, block);
	48	}
	49
	50	struct genericFormat *
	51	udf_add_extendedattr(struct inode * inode, uint32_t size, uint32_t type,
	52	uint8_t loc)
	53	{
	54	uint8_t ea = NULL, ad = NULL;
	55	int offset;
	56	uint16_t crclen;
	57	int i;
	58
	59	ea = UDF_I_DATA(inode);
	60	if (UDF_I_LENEATTR(inode))
	61	ad = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
	62	else
	63	{
	64	ad = ea;
	65	size += sizeof(struct extendedAttrHeaderDesc);
	66	}
	67
	68	offset = inode->i_sb->s_blocksize - udf_file_entry_alloc_offset(inode) -
	69	UDF_I_LENALLOC(inode);
	70
71	/* TODO - Check for FreeEASpace */
72
73	if (loc & 0x01 && offset >= size)
74	{
75	struct extendedAttrHeaderDesc *eahd;
76	eahd = (struct extendedAttrHeaderDesc *)ea;
77
78	if (UDF_I_LENALLOC(inode))
79	{
80	memmove(&ad[size], ad, UDF_I_LENALLOC(inode));
81	}
82
83	if (UDF_I_LENEATTR(inode))
84	{
85	/* check checksum/crc */
86	if (le16_to_cpu(eahd->descTag.tagIdent) != TAG_IDENT_EAHD \|\|
87	le32_to_cpu(eahd->descTag.tagLocation) != UDF_I_LOCATION(inode).logicalBlockNum)
88	{
89	return NULL;
90	}
91	}
92	else
93	{
94	size -= sizeof(struct extendedAttrHeaderDesc);
95	UDF_I_LENEATTR(inode) += sizeof(struct extendedAttrHeaderDesc);
96	eahd->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EAHD);
97	if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
98	eahd->descTag.descVersion = cpu_to_le16(3);
99	else
100	eahd->descTag.descVersion = cpu_to_le16(2);
101	eahd->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
102	eahd->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
103	eahd->impAttrLocation = cpu_to_le32(0xFFFFFFFF);
104	eahd->appAttrLocation = cpu_to_le32(0xFFFFFFFF);
105	}
106
107	offset = UDF_I_LENEATTR(inode);
108	if (type < 2048)
109	{
110	if (le32_to_cpu(eahd->appAttrLocation) < UDF_I_LENEATTR(inode))
111	{
112	uint32_t aal = le32_to_cpu(eahd->appAttrLocation);
113	memmove(&ea[offset - aal + size],
114	&ea[aal], offset - aal);
115	offset -= aal;
116	eahd->appAttrLocation = cpu_to_le32(aal + size);
117	}
118	if (le32_to_cpu(eahd->impAttrLocation) < UDF_I_LENEATTR(inode))
119	{
120	uint32_t ial = le32_to_cpu(eahd->impAttrLocation);
121	memmove(&ea[offset - ial + size],
122	&ea[ial], offset - ial);
123	offset -= ial;
124	eahd->impAttrLocation = cpu_to_le32(ial + size);
125	}
126	}
127	else if (type < 65536)
128	{
129	if (le32_to_cpu(eahd->appAttrLocation) < UDF_I_LENEATTR(inode))
130	{
131	uint32_t aal = le32_to_cpu(eahd->appAttrLocation);
132	memmove(&ea[offset - aal + size],
133	&ea[aal], offset - aal);
134	offset -= aal;
135	eahd->appAttrLocation = cpu_to_le32(aal + size);
136	}
137	}
138	/* rewrite CRC + checksum of eahd */
139	crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag);
140	eahd->descTag.descCRCLength = cpu_to_le16(crclen);
141	eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd + sizeof(tag), crclen, 0));
142	eahd->descTag.tagChecksum = 0;
143	for (i=0; i<16; i++)
144	if (i != 4)
145	eahd->descTag.tagChecksum += ((uint8_t *)&(eahd->descTag))[i];
146	UDF_I_LENEATTR(inode) += size;
147	return (struct genericFormat *)&ea[offset];
148	}
149	if (loc & 0x02)
150	{
151	}
152	return NULL;
153	}
154
155	struct genericFormat *
156	udf_get_extendedattr(struct inode *inode, uint32_t type, uint8_t subtype)
157	{
158	struct genericFormat *gaf;
159	uint8_t *ea = NULL;
160	uint32_t offset;
161
162	ea = UDF_I_DATA(inode);
163
164	if (UDF_I_LENEATTR(inode))
165	{
166	struct extendedAttrHeaderDesc *eahd;
167	eahd = (struct extendedAttrHeaderDesc *)ea;
168
169	/* check checksum/crc */
170	if (le16_to_cpu(eahd->descTag.tagIdent) != TAG_IDENT_EAHD \|\|
171	le32_to_cpu(eahd->descTag.tagLocation) != UDF_I_LOCATION(inode).logicalBlockNum)
172	{
173	return NULL;
174	}
175
176	if (type < 2048)
177	offset = sizeof(struct extendedAttrHeaderDesc);
178	else if (type < 65536)
179	offset = le32_to_cpu(eahd->impAttrLocation);
180	else
181	offset = le32_to_cpu(eahd->appAttrLocation);
182
183	while (offset < UDF_I_LENEATTR(inode))
184	{
185	gaf = (struct genericFormat *)&ea[offset];
186	if (le32_to_cpu(gaf->attrType) == type && gaf->attrSubtype == subtype)
187	return gaf;
188	else
189	offset += le32_to_cpu(gaf->attrLength);
190	}
191	}
192	return NULL;
193	}
194
195	/*
196	* udf_read_tagged
197	*
198	* PURPOSE
199	* Read the first block of a tagged descriptor.
200	*
201	* HISTORY
202	* July 1, 1997 - Andrew E. Mileski
203	* Written, tested, and released.
204	*/
205	struct buffer_head *
206	udf_read_tagged(struct super_block sb, uint32_t block, uint32_t location, uint16_t ident)
207	{
208	tag *tag_p;
209	struct buffer_head *bh = NULL;
210	register uint8_t checksum;
211	register int i;
212
213	/* Read the block */
214	if (block == 0xFFFFFFFF)
215	return NULL;
216
217	bh = udf_tread(sb, block + UDF_SB_SESSION(sb));
218	if (!bh)
219	{
220	udf_debug("block=%d, location=%d: read failed\n", block + UDF_SB_SESSION(sb), location);
221	return NULL;
222	}
223
224	tag_p = (tag *)(bh->b_data);
225
226	*ident = le16_to_cpu(tag_p->tagIdent);
227
228	if ( location != le32_to_cpu(tag_p->tagLocation) )
229	{
230	udf_debug("location mismatch block %u, tag %u != %u\n",
231	block + UDF_SB_SESSION(sb), le32_to_cpu(tag_p->tagLocation), location);
232	goto error_out;
233	}
234
235	/* Verify the tag checksum */
236	checksum = 0U;
237	for (i = 0; i < 4; i++)
238	checksum += (uint8_t)(bh->b_data[i]);
239	for (i = 5; i < 16; i++)
240	checksum += (uint8_t)(bh->b_data[i]);
241	if (checksum != tag_p->tagChecksum) {
242	printk(KERN_ERR "udf: tag checksum failed block %d\n", block);
243	goto error_out;
244	}
245
246	/* Verify the tag version */
247	if (le16_to_cpu(tag_p->descVersion) != 0x0002U &&
248	le16_to_cpu(tag_p->descVersion) != 0x0003U)
249	{
250	udf_debug("tag version 0x%04x != 0x0002 \|\| 0x0003 block %d\n",
251	le16_to_cpu(tag_p->descVersion), block);
252	goto error_out;
253	}
254
255	/* Verify the descriptor CRC */
256	if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize \|\|
257	le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag),
258	le16_to_cpu(tag_p->descCRCLength), 0))
259	{
260	return bh;
261	}
262	udf_debug("Crc failure block %d: crc = %d, crclen = %d\n",
263	block + UDF_SB_SESSION(sb), le16_to_cpu(tag_p->descCRC), le16_to_cpu(tag_p->descCRCLength));
264
265	error_out:
266	brelse(bh);
267	return NULL;
268	}
269
270	struct buffer_head *
271	udf_read_ptagged(struct super_block sb, kernel_lb_addr loc, uint32_t offset, uint16_t ident)
272	{
273	return udf_read_tagged(sb, udf_get_lb_pblock(sb, loc, offset),
274	loc.logicalBlockNum + offset, ident);
275	}
276
1da177e4 LT	277	void udf_update_tag(char *data, int length)
	278	{
	279	tag tptr = (tag )data;
	280	int i;
	281
	282	length -= sizeof(tag);
	283
	284	tptr->tagChecksum = 0;
	285	tptr->descCRCLength = cpu_to_le16(length);
	286	tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0));
	287
	288	for (i=0; i<16; i++)
	289	if (i != 4)
	290	tptr->tagChecksum += (uint8_t)(data[i]);
	291	}
	292
	293	void udf_new_tag(char *data, uint16_t ident, uint16_t version, uint16_t snum,
	294	uint32_t loc, int length)
	295	{
	296	tag tptr = (tag )data;
	297	tptr->tagIdent = cpu_to_le16(ident);
	298	tptr->descVersion = cpu_to_le16(version);
	299	tptr->tagSerialNum = cpu_to_le16(snum);
	300	tptr->tagLocation = cpu_to_le32(loc);
	301	udf_update_tag(data, length);
	302	}