]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * directory.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Directory related functions | |
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 | ||
14 | #include "udfdecl.h" | |
15 | #include "udf_i.h" | |
16 | ||
17 | #include <linux/fs.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/buffer_head.h> | |
20 | ||
21 | #if 0 | |
4b11111a | 22 | static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad, |
cb00ea35 CG |
23 | uint8_t ad_size, kernel_lb_addr fe_loc, |
24 | int *pos, int *offset, struct buffer_head **bh, | |
25 | int *error) | |
1da177e4 LT |
26 | { |
27 | int loffset = *offset; | |
28 | int block; | |
29 | uint8_t *ad; | |
30 | int remainder; | |
31 | ||
32 | *error = 0; | |
33 | ||
28de7948 | 34 | ad = (uint8_t *)(*bh)->b_data + *offset; |
1da177e4 LT |
35 | *offset += ad_size; |
36 | ||
cb00ea35 | 37 | if (!ad) { |
3bf25cb4 | 38 | brelse(*bh); |
1da177e4 LT |
39 | *error = 1; |
40 | return NULL; | |
41 | } | |
42 | ||
cb00ea35 | 43 | if (*offset == dir->i_sb->s_blocksize) { |
3bf25cb4 | 44 | brelse(*bh); |
1da177e4 LT |
45 | block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
46 | if (!block) | |
47 | return NULL; | |
4b11111a MS |
48 | *bh = udf_tread(dir->i_sb, block); |
49 | if (!*bh) | |
1da177e4 | 50 | return NULL; |
cb00ea35 | 51 | } else if (*offset > dir->i_sb->s_blocksize) { |
1da177e4 LT |
52 | ad = tmpad; |
53 | ||
54 | remainder = dir->i_sb->s_blocksize - loffset; | |
28de7948 | 55 | memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder); |
1da177e4 | 56 | |
3bf25cb4 | 57 | brelse(*bh); |
1da177e4 LT |
58 | block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
59 | if (!block) | |
60 | return NULL; | |
4b11111a MS |
61 | (*bh) = udf_tread(dir->i_sb, block); |
62 | if (!*bh) | |
1da177e4 LT |
63 | return NULL; |
64 | ||
4b11111a MS |
65 | memcpy((uint8_t *)ad + remainder, (*bh)->b_data, |
66 | ad_size - remainder); | |
1da177e4 LT |
67 | *offset = ad_size - remainder; |
68 | } | |
28de7948 | 69 | |
1da177e4 LT |
70 | return ad; |
71 | } | |
72 | #endif | |
73 | ||
4b11111a | 74 | struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, |
cb00ea35 CG |
75 | struct udf_fileident_bh *fibh, |
76 | struct fileIdentDesc *cfi, | |
77 | struct extent_position *epos, | |
4b11111a MS |
78 | kernel_lb_addr *eloc, uint32_t *elen, |
79 | sector_t *offset) | |
1da177e4 LT |
80 | { |
81 | struct fileIdentDesc *fi; | |
82 | int i, num, block; | |
cb00ea35 | 83 | struct buffer_head *tmp, *bha[16]; |
1da177e4 LT |
84 | |
85 | fibh->soffset = fibh->eoffset; | |
86 | ||
cb00ea35 | 87 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { |
1da177e4 | 88 | fi = udf_get_fileident(UDF_I_DATA(dir) - |
cb00ea35 CG |
89 | (UDF_I_EFE(dir) ? |
90 | sizeof(struct extendedFileEntry) : | |
91 | sizeof(struct fileEntry)), | |
4b11111a MS |
92 | dir->i_sb->s_blocksize, |
93 | &(fibh->eoffset)); | |
1da177e4 LT |
94 | if (!fi) |
95 | return NULL; | |
96 | ||
97 | *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); | |
98 | ||
28de7948 | 99 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 | 100 | sizeof(struct fileIdentDesc)); |
1da177e4 LT |
101 | |
102 | return fi; | |
103 | } | |
104 | ||
cb00ea35 | 105 | if (fibh->eoffset == dir->i_sb->s_blocksize) { |
ff116fc8 | 106 | int lextoffset = epos->offset; |
4b11111a | 107 | unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits; |
1da177e4 | 108 | |
ff116fc8 | 109 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 110 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 111 | return NULL; |
1da177e4 LT |
112 | |
113 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
114 | ||
cb00ea35 | 115 | (*offset)++; |
1da177e4 | 116 | |
4b11111a | 117 | if ((*offset << blocksize_bits) >= *elen) |
1da177e4 LT |
118 | *offset = 0; |
119 | else | |
ff116fc8 | 120 | epos->offset = lextoffset; |
1da177e4 | 121 | |
3bf25cb4 | 122 | brelse(fibh->sbh); |
4b11111a MS |
123 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
124 | if (!fibh->sbh) | |
1da177e4 LT |
125 | return NULL; |
126 | fibh->soffset = fibh->eoffset = 0; | |
127 | ||
4b11111a MS |
128 | if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) { |
129 | i = 16 >> (blocksize_bits - 9); | |
130 | if (i + *offset > (*elen >> blocksize_bits)) | |
131 | i = (*elen >> blocksize_bits)-*offset; | |
cb00ea35 | 132 | for (num = 0; i > 0; i--) { |
4b11111a MS |
133 | block = udf_get_lb_pblock(dir->i_sb, *eloc, |
134 | *offset + i); | |
1da177e4 | 135 | tmp = udf_tgetblk(dir->i_sb, block); |
4b11111a MS |
136 | if (tmp && !buffer_uptodate(tmp) && |
137 | !buffer_locked(tmp)) | |
1da177e4 LT |
138 | bha[num++] = tmp; |
139 | else | |
140 | brelse(tmp); | |
141 | } | |
cb00ea35 | 142 | if (num) { |
1da177e4 | 143 | ll_rw_block(READA, num, bha); |
cb00ea35 | 144 | for (i = 0; i < num; i++) |
1da177e4 LT |
145 | brelse(bha[i]); |
146 | } | |
147 | } | |
cb00ea35 | 148 | } else if (fibh->sbh != fibh->ebh) { |
3bf25cb4 | 149 | brelse(fibh->sbh); |
1da177e4 LT |
150 | fibh->sbh = fibh->ebh; |
151 | } | |
152 | ||
153 | fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, | |
cb00ea35 | 154 | &(fibh->eoffset)); |
1da177e4 LT |
155 | |
156 | if (!fi) | |
157 | return NULL; | |
158 | ||
159 | *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); | |
160 | ||
cb00ea35 | 161 | if (fibh->eoffset <= dir->i_sb->s_blocksize) { |
28de7948 | 162 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 CG |
163 | sizeof(struct fileIdentDesc)); |
164 | } else if (fibh->eoffset > dir->i_sb->s_blocksize) { | |
ff116fc8 | 165 | int lextoffset = epos->offset; |
1da177e4 | 166 | |
ff116fc8 | 167 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 168 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 169 | return NULL; |
1da177e4 LT |
170 | |
171 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
172 | ||
cb00ea35 | 173 | (*offset)++; |
1da177e4 LT |
174 | |
175 | if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) | |
176 | *offset = 0; | |
177 | else | |
ff116fc8 | 178 | epos->offset = lextoffset; |
1da177e4 LT |
179 | |
180 | fibh->soffset -= dir->i_sb->s_blocksize; | |
181 | fibh->eoffset -= dir->i_sb->s_blocksize; | |
182 | ||
4b11111a MS |
183 | fibh->ebh = udf_tread(dir->i_sb, block); |
184 | if (!fibh->ebh) | |
1da177e4 LT |
185 | return NULL; |
186 | ||
cb00ea35 | 187 | if (sizeof(struct fileIdentDesc) > -fibh->soffset) { |
1da177e4 LT |
188 | int fi_len; |
189 | ||
28de7948 | 190 | memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset); |
4b11111a MS |
191 | memcpy((uint8_t *)cfi - fibh->soffset, |
192 | fibh->ebh->b_data, | |
cb00ea35 | 193 | sizeof(struct fileIdentDesc) + fibh->soffset); |
1da177e4 | 194 | |
4b11111a MS |
195 | fi_len = (sizeof(struct fileIdentDesc) + |
196 | cfi->lengthFileIdent + | |
28de7948 | 197 | le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; |
1da177e4 | 198 | |
4b11111a MS |
199 | *nf_pos += (fi_len - (fibh->eoffset - fibh->soffset)) |
200 | >> 2; | |
1da177e4 | 201 | fibh->eoffset = fibh->soffset + fi_len; |
cb00ea35 | 202 | } else { |
28de7948 | 203 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 | 204 | sizeof(struct fileIdentDesc)); |
1da177e4 LT |
205 | } |
206 | } | |
207 | return fi; | |
208 | } | |
209 | ||
cb00ea35 | 210 | struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset) |
1da177e4 LT |
211 | { |
212 | struct fileIdentDesc *fi; | |
213 | int lengthThisIdent; | |
cb00ea35 | 214 | uint8_t *ptr; |
1da177e4 LT |
215 | int padlen; |
216 | ||
cb00ea35 CG |
217 | if ((!buffer) || (!offset)) { |
218 | udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, | |
219 | offset); | |
1da177e4 LT |
220 | return NULL; |
221 | } | |
222 | ||
223 | ptr = buffer; | |
224 | ||
4b11111a | 225 | if ((*offset > 0) && (*offset < bufsize)) |
1da177e4 | 226 | ptr += *offset; |
cb00ea35 CG |
227 | fi = (struct fileIdentDesc *)ptr; |
228 | if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID) { | |
1da177e4 | 229 | udf_debug("0x%x != TAG_IDENT_FID\n", |
cb00ea35 | 230 | le16_to_cpu(fi->descTag.tagIdent)); |
1da177e4 | 231 | udf_debug("offset: %u sizeof: %lu bufsize: %u\n", |
cb00ea35 CG |
232 | *offset, (unsigned long)sizeof(struct fileIdentDesc), |
233 | bufsize); | |
1da177e4 LT |
234 | return NULL; |
235 | } | |
4b11111a | 236 | if ((*offset + sizeof(struct fileIdentDesc)) > bufsize) |
1da177e4 | 237 | lengthThisIdent = sizeof(struct fileIdentDesc); |
4b11111a | 238 | else |
1da177e4 | 239 | lengthThisIdent = sizeof(struct fileIdentDesc) + |
28de7948 | 240 | fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); |
1da177e4 LT |
241 | |
242 | /* we need to figure padding, too! */ | |
243 | padlen = lengthThisIdent % UDF_NAME_PAD; | |
244 | if (padlen) | |
245 | lengthThisIdent += (UDF_NAME_PAD - padlen); | |
246 | *offset = *offset + lengthThisIdent; | |
247 | ||
248 | return fi; | |
249 | } | |
250 | ||
251 | #if 0 | |
cb00ea35 | 252 | static extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset) |
1da177e4 | 253 | { |
cb00ea35 | 254 | extent_ad *ext; |
1da177e4 | 255 | struct fileEntry *fe; |
cb00ea35 | 256 | uint8_t *ptr; |
1da177e4 | 257 | |
cb00ea35 | 258 | if ((!buffer) || (!offset)) { |
1da177e4 LT |
259 | printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); |
260 | return NULL; | |
261 | } | |
262 | ||
263 | fe = (struct fileEntry *)buffer; | |
264 | ||
cb00ea35 | 265 | if (le16_to_cpu(fe->descTag.tagIdent) != TAG_IDENT_FE) { |
1da177e4 | 266 | udf_debug("0x%x != TAG_IDENT_FE\n", |
cb00ea35 | 267 | le16_to_cpu(fe->descTag.tagIdent)); |
1da177e4 LT |
268 | return NULL; |
269 | } | |
270 | ||
4b11111a MS |
271 | ptr = (uint8_t *)(fe->extendedAttr) + |
272 | le32_to_cpu(fe->lengthExtendedAttr); | |
1da177e4 | 273 | |
4b11111a | 274 | if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs))) |
1da177e4 | 275 | ptr += *offset; |
1da177e4 | 276 | |
28de7948 | 277 | ext = (extent_ad *)ptr; |
1da177e4 LT |
278 | |
279 | *offset = *offset + sizeof(extent_ad); | |
280 | return ext; | |
281 | } | |
282 | #endif | |
283 | ||
28de7948 | 284 | short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, |
cb00ea35 | 285 | int inc) |
1da177e4 LT |
286 | { |
287 | short_ad *sa; | |
288 | ||
cb00ea35 | 289 | if ((!ptr) || (!offset)) { |
1da177e4 LT |
290 | printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); |
291 | return NULL; | |
292 | } | |
293 | ||
cb00ea35 | 294 | if ((*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset)) |
1da177e4 | 295 | return NULL; |
4b11111a MS |
296 | else { |
297 | sa = (short_ad *)ptr; | |
298 | if (sa->extLength == 0) | |
299 | return NULL; | |
300 | } | |
1da177e4 LT |
301 | |
302 | if (inc) | |
303 | *offset += sizeof(short_ad); | |
304 | return sa; | |
305 | } | |
306 | ||
28de7948 | 307 | long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, int *offset, int inc) |
1da177e4 LT |
308 | { |
309 | long_ad *la; | |
310 | ||
cb00ea35 | 311 | if ((!ptr) || (!offset)) { |
1da177e4 LT |
312 | printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); |
313 | return NULL; | |
314 | } | |
315 | ||
cb00ea35 | 316 | if ((*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset)) |
1da177e4 | 317 | return NULL; |
4b11111a MS |
318 | else { |
319 | la = (long_ad *)ptr; | |
320 | if (la->extLength == 0) | |
321 | return NULL; | |
322 | } | |
1da177e4 LT |
323 | |
324 | if (inc) | |
325 | *offset += sizeof(long_ad); | |
326 | return la; | |
327 | } |