1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* 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>
struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
struct udf_fileident_bh *fibh,
struct fileIdentDesc *cfi,
struct extent_position *epos,
struct 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(REQ_OP_READ, 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, 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;
}
struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
int inc)
{
struct short_ad *sa;
if ((!ptr) || (!offset)) {
pr_err("%s: invalidparms\n", __func__);
return NULL;
}
if ((*offset + sizeof(struct short_ad)) > maxoffset)
return NULL;
else {
sa = (struct short_ad *)ptr;
if (sa->extLength == 0)
return NULL;
}
if (inc)
*offset += sizeof(struct short_ad);
return sa;
}
struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
{
struct long_ad *la;
if ((!ptr) || (!offset)) {
pr_err("%s: invalidparms\n", __func__);
return NULL;
}
if ((*offset + sizeof(struct long_ad)) > maxoffset)
return NULL;
else {
la = (struct long_ad *)ptr;
if (la->extLength == 0)
return NULL;
}
if (inc)
*offset += sizeof(struct long_ad);
return la;
}
|
