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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/udf/misc.c
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/crc-itu-t.h>
31 struct buffer_head
*udf_tgetblk(struct super_block
*sb
, udf_pblk_t block
)
33 if (UDF_QUERY_FLAG(sb
, UDF_FLAG_VARCONV
))
34 return sb_getblk(sb
, udf_fixed_to_variable(block
));
36 return sb_getblk(sb
, block
);
39 struct buffer_head
*udf_tread(struct super_block
*sb
, udf_pblk_t block
)
41 if (UDF_QUERY_FLAG(sb
, UDF_FLAG_VARCONV
))
42 return sb_bread(sb
, udf_fixed_to_variable(block
));
44 return sb_bread(sb
, block
);
47 struct genericFormat
*udf_add_extendedattr(struct inode
*inode
, uint32_t size
,
48 uint32_t type
, uint8_t loc
)
50 uint8_t *ea
= NULL
, *ad
= NULL
;
53 struct udf_inode_info
*iinfo
= UDF_I(inode
);
56 if (iinfo
->i_lenEAttr
) {
57 ad
= iinfo
->i_data
+ iinfo
->i_lenEAttr
;
60 size
+= sizeof(struct extendedAttrHeaderDesc
);
63 offset
= inode
->i_sb
->s_blocksize
- udf_file_entry_alloc_offset(inode
) -
66 /* TODO - Check for FreeEASpace */
68 if (loc
& 0x01 && offset
>= size
) {
69 struct extendedAttrHeaderDesc
*eahd
;
70 eahd
= (struct extendedAttrHeaderDesc
*)ea
;
72 if (iinfo
->i_lenAlloc
)
73 memmove(&ad
[size
], ad
, iinfo
->i_lenAlloc
);
75 if (iinfo
->i_lenEAttr
) {
76 /* check checksum/crc */
77 if (eahd
->descTag
.tagIdent
!=
78 cpu_to_le16(TAG_IDENT_EAHD
) ||
79 le32_to_cpu(eahd
->descTag
.tagLocation
) !=
80 iinfo
->i_location
.logicalBlockNum
)
83 struct udf_sb_info
*sbi
= UDF_SB(inode
->i_sb
);
85 size
-= sizeof(struct extendedAttrHeaderDesc
);
87 sizeof(struct extendedAttrHeaderDesc
);
88 eahd
->descTag
.tagIdent
= cpu_to_le16(TAG_IDENT_EAHD
);
89 if (sbi
->s_udfrev
>= 0x0200)
90 eahd
->descTag
.descVersion
= cpu_to_le16(3);
92 eahd
->descTag
.descVersion
= cpu_to_le16(2);
93 eahd
->descTag
.tagSerialNum
=
94 cpu_to_le16(sbi
->s_serial_number
);
95 eahd
->descTag
.tagLocation
= cpu_to_le32(
96 iinfo
->i_location
.logicalBlockNum
);
97 eahd
->impAttrLocation
= cpu_to_le32(0xFFFFFFFF);
98 eahd
->appAttrLocation
= cpu_to_le32(0xFFFFFFFF);
101 offset
= iinfo
->i_lenEAttr
;
103 if (le32_to_cpu(eahd
->appAttrLocation
) <
106 le32_to_cpu(eahd
->appAttrLocation
);
107 memmove(&ea
[offset
- aal
+ size
],
108 &ea
[aal
], offset
- aal
);
110 eahd
->appAttrLocation
=
111 cpu_to_le32(aal
+ size
);
113 if (le32_to_cpu(eahd
->impAttrLocation
) <
116 le32_to_cpu(eahd
->impAttrLocation
);
117 memmove(&ea
[offset
- ial
+ size
],
118 &ea
[ial
], offset
- ial
);
120 eahd
->impAttrLocation
=
121 cpu_to_le32(ial
+ size
);
123 } else if (type
< 65536) {
124 if (le32_to_cpu(eahd
->appAttrLocation
) <
127 le32_to_cpu(eahd
->appAttrLocation
);
128 memmove(&ea
[offset
- aal
+ size
],
129 &ea
[aal
], offset
- aal
);
131 eahd
->appAttrLocation
=
132 cpu_to_le32(aal
+ size
);
135 /* rewrite CRC + checksum of eahd */
136 crclen
= sizeof(struct extendedAttrHeaderDesc
) - sizeof(struct tag
);
137 eahd
->descTag
.descCRCLength
= cpu_to_le16(crclen
);
138 eahd
->descTag
.descCRC
= cpu_to_le16(crc_itu_t(0, (char *)eahd
+
139 sizeof(struct tag
), crclen
));
140 eahd
->descTag
.tagChecksum
= udf_tag_checksum(&eahd
->descTag
);
141 iinfo
->i_lenEAttr
+= size
;
142 return (struct genericFormat
*)&ea
[offset
];
148 struct genericFormat
*udf_get_extendedattr(struct inode
*inode
, uint32_t type
,
151 struct genericFormat
*gaf
;
154 struct udf_inode_info
*iinfo
= UDF_I(inode
);
158 if (iinfo
->i_lenEAttr
) {
159 struct extendedAttrHeaderDesc
*eahd
;
160 eahd
= (struct extendedAttrHeaderDesc
*)ea
;
162 /* check checksum/crc */
163 if (eahd
->descTag
.tagIdent
!=
164 cpu_to_le16(TAG_IDENT_EAHD
) ||
165 le32_to_cpu(eahd
->descTag
.tagLocation
) !=
166 iinfo
->i_location
.logicalBlockNum
)
170 offset
= sizeof(struct extendedAttrHeaderDesc
);
171 else if (type
< 65536)
172 offset
= le32_to_cpu(eahd
->impAttrLocation
);
174 offset
= le32_to_cpu(eahd
->appAttrLocation
);
176 while (offset
+ sizeof(*gaf
) < iinfo
->i_lenEAttr
) {
179 gaf
= (struct genericFormat
*)&ea
[offset
];
180 attrLength
= le32_to_cpu(gaf
->attrLength
);
182 /* Detect undersized elements and buffer overflows */
183 if ((attrLength
< sizeof(*gaf
)) ||
184 (attrLength
> (iinfo
->i_lenEAttr
- offset
)))
187 if (le32_to_cpu(gaf
->attrType
) == type
&&
188 gaf
->attrSubtype
== subtype
)
191 offset
+= attrLength
;
202 * Read the first block of a tagged descriptor.
205 * July 1, 1997 - Andrew E. Mileski
206 * Written, tested, and released.
208 struct buffer_head
*udf_read_tagged(struct super_block
*sb
, uint32_t block
,
209 uint32_t location
, uint16_t *ident
)
212 struct buffer_head
*bh
= NULL
;
216 if (block
== 0xFFFFFFFF)
219 bh
= udf_tread(sb
, block
);
221 udf_err(sb
, "read failed, block=%u, location=%u\n",
226 tag_p
= (struct tag
*)(bh
->b_data
);
228 *ident
= le16_to_cpu(tag_p
->tagIdent
);
230 if (location
!= le32_to_cpu(tag_p
->tagLocation
)) {
231 udf_debug("location mismatch block %u, tag %u != %u\n",
232 block
, le32_to_cpu(tag_p
->tagLocation
), location
);
236 /* Verify the tag checksum */
237 checksum
= udf_tag_checksum(tag_p
);
238 if (checksum
!= tag_p
->tagChecksum
) {
239 udf_err(sb
, "tag checksum failed, block %u: 0x%02x != 0x%02x\n",
240 block
, checksum
, tag_p
->tagChecksum
);
244 /* Verify the tag version */
245 if (tag_p
->descVersion
!= cpu_to_le16(0x0002U
) &&
246 tag_p
->descVersion
!= cpu_to_le16(0x0003U
)) {
247 udf_err(sb
, "tag version 0x%04x != 0x0002 || 0x0003, block %u\n",
248 le16_to_cpu(tag_p
->descVersion
), block
);
252 /* Verify the descriptor CRC */
253 if (le16_to_cpu(tag_p
->descCRCLength
) + sizeof(struct tag
) > sb
->s_blocksize
||
254 le16_to_cpu(tag_p
->descCRC
) == crc_itu_t(0,
255 bh
->b_data
+ sizeof(struct tag
),
256 le16_to_cpu(tag_p
->descCRCLength
)))
259 udf_debug("Crc failure block %u: crc = %u, crclen = %u\n", block
,
260 le16_to_cpu(tag_p
->descCRC
),
261 le16_to_cpu(tag_p
->descCRCLength
));
267 struct buffer_head
*udf_read_ptagged(struct super_block
*sb
,
268 struct kernel_lb_addr
*loc
,
269 uint32_t offset
, uint16_t *ident
)
271 return udf_read_tagged(sb
, udf_get_lb_pblock(sb
, loc
, offset
),
272 loc
->logicalBlockNum
+ offset
, ident
);
275 void udf_update_tag(char *data
, int length
)
277 struct tag
*tptr
= (struct tag
*)data
;
278 length
-= sizeof(struct tag
);
280 tptr
->descCRCLength
= cpu_to_le16(length
);
281 tptr
->descCRC
= cpu_to_le16(crc_itu_t(0, data
+ sizeof(struct tag
), length
));
282 tptr
->tagChecksum
= udf_tag_checksum(tptr
);
285 void udf_new_tag(char *data
, uint16_t ident
, uint16_t version
, uint16_t snum
,
286 uint32_t loc
, int length
)
288 struct tag
*tptr
= (struct tag
*)data
;
289 tptr
->tagIdent
= cpu_to_le16(ident
);
290 tptr
->descVersion
= cpu_to_le16(version
);
291 tptr
->tagSerialNum
= cpu_to_le16(snum
);
292 tptr
->tagLocation
= cpu_to_le32(loc
);
293 udf_update_tag(data
, length
);
296 u8
udf_tag_checksum(const struct tag
*t
)
301 for (i
= 0; i
< sizeof(struct tag
); ++i
)
302 if (i
!= 4) /* position of checksum */