a0bf4158f1f1ec9a63700191b21a043a4ea40648
5 * Miscellaneous routines for the OSTA-UDF(tm) filesystem.
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.
13 * (C) 1998 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
19 * 04/19/99 blf partial support for reading/writing specific EA's
25 #include <linux/string.h>
26 #include <linux/udf_fs.h>
27 #include <linux/buffer_head.h>
32 struct buffer_head
*udf_tgetblk(struct super_block
*sb
, int block
)
34 if (UDF_QUERY_FLAG(sb
, UDF_FLAG_VARCONV
))
35 return sb_getblk(sb
, udf_fixed_to_variable(block
));
37 return sb_getblk(sb
, block
);
40 struct buffer_head
*udf_tread(struct super_block
*sb
, int block
)
42 if (UDF_QUERY_FLAG(sb
, UDF_FLAG_VARCONV
))
43 return sb_bread(sb
, udf_fixed_to_variable(block
));
45 return sb_bread(sb
, block
);
48 struct genericFormat
*udf_add_extendedattr(struct inode
*inode
, uint32_t size
,
49 uint32_t type
, uint8_t loc
)
51 uint8_t *ea
= NULL
, *ad
= NULL
;
56 ea
= UDF_I_DATA(inode
);
57 if (UDF_I_LENEATTR(inode
)) {
58 ad
= UDF_I_DATA(inode
) + UDF_I_LENEATTR(inode
);
61 size
+= sizeof(struct extendedAttrHeaderDesc
);
64 offset
= inode
->i_sb
->s_blocksize
- udf_file_entry_alloc_offset(inode
) -
65 UDF_I_LENALLOC(inode
);
67 /* TODO - Check for FreeEASpace */
69 if (loc
& 0x01 && offset
>= size
) {
70 struct extendedAttrHeaderDesc
*eahd
;
71 eahd
= (struct extendedAttrHeaderDesc
*)ea
;
73 if (UDF_I_LENALLOC(inode
))
74 memmove(&ad
[size
], ad
, UDF_I_LENALLOC(inode
));
76 if (UDF_I_LENEATTR(inode
)) {
77 /* check checksum/crc */
78 if (le16_to_cpu(eahd
->descTag
.tagIdent
) !=
80 le32_to_cpu(eahd
->descTag
.tagLocation
) !=
81 UDF_I_LOCATION(inode
).logicalBlockNum
)
84 struct udf_sb_info
*sbi
= UDF_SB(inode
->i_sb
);
86 size
-= sizeof(struct extendedAttrHeaderDesc
);
87 UDF_I_LENEATTR(inode
) +=
88 sizeof(struct extendedAttrHeaderDesc
);
89 eahd
->descTag
.tagIdent
= cpu_to_le16(TAG_IDENT_EAHD
);
90 if (sbi
->s_udfrev
>= 0x0200)
91 eahd
->descTag
.descVersion
= cpu_to_le16(3);
93 eahd
->descTag
.descVersion
= cpu_to_le16(2);
94 eahd
->descTag
.tagSerialNum
=
95 cpu_to_le16(sbi
->s_serial_number
);
96 eahd
->descTag
.tagLocation
= cpu_to_le32(
97 UDF_I_LOCATION(inode
).logicalBlockNum
);
98 eahd
->impAttrLocation
= cpu_to_le32(0xFFFFFFFF);
99 eahd
->appAttrLocation
= cpu_to_le32(0xFFFFFFFF);
102 offset
= UDF_I_LENEATTR(inode
);
104 if (le32_to_cpu(eahd
->appAttrLocation
) <
105 UDF_I_LENEATTR(inode
)) {
107 le32_to_cpu(eahd
->appAttrLocation
);
108 memmove(&ea
[offset
- aal
+ size
],
109 &ea
[aal
], offset
- aal
);
111 eahd
->appAttrLocation
=
112 cpu_to_le32(aal
+ size
);
114 if (le32_to_cpu(eahd
->impAttrLocation
) <
115 UDF_I_LENEATTR(inode
)) {
117 le32_to_cpu(eahd
->impAttrLocation
);
118 memmove(&ea
[offset
- ial
+ size
],
119 &ea
[ial
], offset
- ial
);
121 eahd
->impAttrLocation
=
122 cpu_to_le32(ial
+ size
);
124 } else if (type
< 65536) {
125 if (le32_to_cpu(eahd
->appAttrLocation
) <
126 UDF_I_LENEATTR(inode
)) {
128 le32_to_cpu(eahd
->appAttrLocation
);
129 memmove(&ea
[offset
- aal
+ size
],
130 &ea
[aal
], offset
- aal
);
132 eahd
->appAttrLocation
=
133 cpu_to_le32(aal
+ size
);
136 /* rewrite CRC + checksum of eahd */
137 crclen
= sizeof(struct extendedAttrHeaderDesc
) - sizeof(tag
);
138 eahd
->descTag
.descCRCLength
= cpu_to_le16(crclen
);
139 eahd
->descTag
.descCRC
= cpu_to_le16(udf_crc((char *)eahd
+
140 sizeof(tag
), crclen
, 0));
141 eahd
->descTag
.tagChecksum
= 0;
142 for (i
= 0; i
< 16; i
++)
144 eahd
->descTag
.tagChecksum
+=
145 ((uint8_t *)&(eahd
->descTag
))[i
];
146 UDF_I_LENEATTR(inode
) += size
;
147 return (struct genericFormat
*)&ea
[offset
];
155 struct genericFormat
*udf_get_extendedattr(struct inode
*inode
, uint32_t type
,
158 struct genericFormat
*gaf
;
162 ea
= UDF_I_DATA(inode
);
164 if (UDF_I_LENEATTR(inode
)) {
165 struct extendedAttrHeaderDesc
*eahd
;
166 eahd
= (struct extendedAttrHeaderDesc
*)ea
;
168 /* check checksum/crc */
169 if (le16_to_cpu(eahd
->descTag
.tagIdent
) !=
171 le32_to_cpu(eahd
->descTag
.tagLocation
) !=
172 UDF_I_LOCATION(inode
).logicalBlockNum
)
176 offset
= sizeof(struct extendedAttrHeaderDesc
);
177 else if (type
< 65536)
178 offset
= le32_to_cpu(eahd
->impAttrLocation
);
180 offset
= le32_to_cpu(eahd
->appAttrLocation
);
182 while (offset
< UDF_I_LENEATTR(inode
)) {
183 gaf
= (struct genericFormat
*)&ea
[offset
];
184 if (le32_to_cpu(gaf
->attrType
) == type
&&
185 gaf
->attrSubtype
== subtype
)
188 offset
+= le32_to_cpu(gaf
->attrLength
);
199 * Read the first block of a tagged descriptor.
202 * July 1, 1997 - Andrew E. Mileski
203 * Written, tested, and released.
205 struct buffer_head
*udf_read_tagged(struct super_block
*sb
, uint32_t block
,
206 uint32_t location
, uint16_t *ident
)
209 struct buffer_head
*bh
= NULL
;
210 register uint8_t checksum
;
212 struct udf_sb_info
*sbi
= UDF_SB(sb
);
215 if (block
== 0xFFFFFFFF)
218 bh
= udf_tread(sb
, block
+ sbi
->s_session
);
220 udf_debug("block=%d, location=%d: read failed\n",
221 block
+ sbi
->s_session
, location
);
225 tag_p
= (tag
*)(bh
->b_data
);
227 *ident
= le16_to_cpu(tag_p
->tagIdent
);
229 if (location
!= le32_to_cpu(tag_p
->tagLocation
)) {
230 udf_debug("location mismatch block %u, tag %u != %u\n",
231 block
+ sbi
->s_session
,
232 le32_to_cpu(tag_p
->tagLocation
), location
);
236 /* Verify the tag checksum */
238 for (i
= 0; i
< 4; i
++)
239 checksum
+= (uint8_t)(bh
->b_data
[i
]);
240 for (i
= 5; i
< 16; i
++)
241 checksum
+= (uint8_t)(bh
->b_data
[i
]);
242 if (checksum
!= tag_p
->tagChecksum
) {
243 printk(KERN_ERR
"udf: tag checksum failed block %d\n", block
);
247 /* Verify the tag version */
248 if (le16_to_cpu(tag_p
->descVersion
) != 0x0002U
&&
249 le16_to_cpu(tag_p
->descVersion
) != 0x0003U
) {
250 udf_debug("tag version 0x%04x != 0x0002 || 0x0003 block %d\n",
251 le16_to_cpu(tag_p
->descVersion
), block
);
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))
261 udf_debug("Crc failure block %d: crc = %d, crclen = %d\n",
262 block
+ sbi
->s_session
, le16_to_cpu(tag_p
->descCRC
),
263 le16_to_cpu(tag_p
->descCRCLength
));
270 struct buffer_head
*udf_read_ptagged(struct super_block
*sb
, kernel_lb_addr loc
,
271 uint32_t offset
, uint16_t *ident
)
273 return udf_read_tagged(sb
, udf_get_lb_pblock(sb
, loc
, offset
),
274 loc
.logicalBlockNum
+ offset
, ident
);
277 void udf_update_tag(char *data
, int length
)
279 tag
*tptr
= (tag
*)data
;
282 length
-= sizeof(tag
);
284 tptr
->tagChecksum
= 0;
285 tptr
->descCRCLength
= cpu_to_le16(length
);
286 tptr
->descCRC
= cpu_to_le16(udf_crc(data
+ sizeof(tag
), length
, 0));
288 for (i
= 0; i
< 16; i
++)
290 tptr
->tagChecksum
+= (uint8_t)(data
[i
]);
293 void udf_new_tag(char *data
, uint16_t ident
, uint16_t version
, uint16_t snum
,
294 uint32_t loc
, int length
)
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
);
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