Commit | Line | Data |
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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 | |
22 | static uint8_t * | |
23 | udf_filead_read(struct inode *dir, uint8_t *tmpad, uint8_t ad_size, | |
24 | kernel_lb_addr fe_loc, int *pos, int *offset, | |
25 | struct buffer_head **bh, int *error) | |
26 | { | |
27 | int loffset = *offset; | |
28 | int block; | |
29 | uint8_t *ad; | |
30 | int remainder; | |
31 | ||
32 | *error = 0; | |
33 | ||
34 | ad = (uint8_t *)(*bh)->b_data + *offset; | |
35 | *offset += ad_size; | |
36 | ||
37 | if (!ad) | |
38 | { | |
39 | udf_release_data(*bh); | |
40 | *error = 1; | |
41 | return NULL; | |
42 | } | |
43 | ||
44 | if (*offset == dir->i_sb->s_blocksize) | |
45 | { | |
46 | udf_release_data(*bh); | |
47 | block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); | |
48 | if (!block) | |
49 | return NULL; | |
50 | if (!(*bh = udf_tread(dir->i_sb, block))) | |
51 | return NULL; | |
52 | } | |
53 | else if (*offset > dir->i_sb->s_blocksize) | |
54 | { | |
55 | ad = tmpad; | |
56 | ||
57 | remainder = dir->i_sb->s_blocksize - loffset; | |
58 | memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder); | |
59 | ||
60 | udf_release_data(*bh); | |
61 | block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); | |
62 | if (!block) | |
63 | return NULL; | |
64 | if (!((*bh) = udf_tread(dir->i_sb, block))) | |
65 | return NULL; | |
66 | ||
67 | memcpy((uint8_t *)ad + remainder, (*bh)->b_data, ad_size - remainder); | |
68 | *offset = ad_size - remainder; | |
69 | } | |
70 | return ad; | |
71 | } | |
72 | #endif | |
73 | ||
74 | struct fileIdentDesc * | |
75 | udf_fileident_read(struct inode *dir, loff_t *nf_pos, | |
76 | struct udf_fileident_bh *fibh, | |
77 | struct fileIdentDesc *cfi, | |
78 | kernel_lb_addr *bloc, uint32_t *extoffset, | |
79 | kernel_lb_addr *eloc, uint32_t *elen, | |
80 | uint32_t *offset, struct buffer_head **bh) | |
81 | { | |
82 | struct fileIdentDesc *fi; | |
83 | int i, num, block; | |
84 | struct buffer_head * tmp, * bha[16]; | |
85 | ||
86 | fibh->soffset = fibh->eoffset; | |
87 | ||
88 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
89 | { | |
90 | fi = udf_get_fileident(UDF_I_DATA(dir) - | |
91 | (UDF_I_EFE(dir) ? | |
92 | sizeof(struct extendedFileEntry) : | |
93 | sizeof(struct fileEntry)), | |
94 | dir->i_sb->s_blocksize, &(fibh->eoffset)); | |
95 | ||
96 | if (!fi) | |
97 | return NULL; | |
98 | ||
99 | *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); | |
100 | ||
101 | memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); | |
102 | ||
103 | return fi; | |
104 | } | |
105 | ||
106 | if (fibh->eoffset == dir->i_sb->s_blocksize) | |
107 | { | |
108 | int lextoffset = *extoffset; | |
109 | ||
110 | if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) != | |
111 | (EXT_RECORDED_ALLOCATED >> 30)) | |
112 | { | |
113 | return NULL; | |
114 | } | |
115 | ||
116 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
117 | ||
118 | (*offset) ++; | |
119 | ||
120 | if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) | |
121 | *offset = 0; | |
122 | else | |
123 | *extoffset = lextoffset; | |
124 | ||
125 | udf_release_data(fibh->sbh); | |
126 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) | |
127 | return NULL; | |
128 | fibh->soffset = fibh->eoffset = 0; | |
129 | ||
130 | if (!(*offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1))) | |
131 | { | |
132 | i = 16 >> (dir->i_sb->s_blocksize_bits - 9); | |
133 | if (i+*offset > (*elen >> dir->i_sb->s_blocksize_bits)) | |
134 | i = (*elen >> dir->i_sb->s_blocksize_bits)-*offset; | |
135 | for (num=0; i>0; i--) | |
136 | { | |
137 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset+i); | |
138 | tmp = udf_tgetblk(dir->i_sb, block); | |
139 | if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) | |
140 | bha[num++] = tmp; | |
141 | else | |
142 | brelse(tmp); | |
143 | } | |
144 | if (num) | |
145 | { | |
146 | ll_rw_block(READA, num, bha); | |
147 | for (i=0; i<num; i++) | |
148 | brelse(bha[i]); | |
149 | } | |
150 | } | |
151 | } | |
152 | else if (fibh->sbh != fibh->ebh) | |
153 | { | |
154 | udf_release_data(fibh->sbh); | |
155 | fibh->sbh = fibh->ebh; | |
156 | } | |
157 | ||
158 | fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, | |
159 | &(fibh->eoffset)); | |
160 | ||
161 | if (!fi) | |
162 | return NULL; | |
163 | ||
164 | *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); | |
165 | ||
166 | if (fibh->eoffset <= dir->i_sb->s_blocksize) | |
167 | { | |
168 | memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); | |
169 | } | |
170 | else if (fibh->eoffset > dir->i_sb->s_blocksize) | |
171 | { | |
172 | int lextoffset = *extoffset; | |
173 | ||
174 | if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) != | |
175 | (EXT_RECORDED_ALLOCATED >> 30)) | |
176 | { | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
181 | ||
182 | (*offset) ++; | |
183 | ||
184 | if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) | |
185 | *offset = 0; | |
186 | else | |
187 | *extoffset = lextoffset; | |
188 | ||
189 | fibh->soffset -= dir->i_sb->s_blocksize; | |
190 | fibh->eoffset -= dir->i_sb->s_blocksize; | |
191 | ||
192 | if (!(fibh->ebh = udf_tread(dir->i_sb, block))) | |
193 | return NULL; | |
194 | ||
195 | if (sizeof(struct fileIdentDesc) > - fibh->soffset) | |
196 | { | |
197 | int fi_len; | |
198 | ||
199 | memcpy((uint8_t *)cfi, (uint8_t *)fi, - fibh->soffset); | |
200 | memcpy((uint8_t *)cfi - fibh->soffset, fibh->ebh->b_data, | |
201 | sizeof(struct fileIdentDesc) + fibh->soffset); | |
202 | ||
203 | fi_len = (sizeof(struct fileIdentDesc) + cfi->lengthFileIdent + | |
204 | le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; | |
205 | ||
206 | *nf_pos += ((fi_len - (fibh->eoffset - fibh->soffset)) >> 2); | |
207 | fibh->eoffset = fibh->soffset + fi_len; | |
208 | } | |
209 | else | |
210 | { | |
211 | memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); | |
212 | } | |
213 | } | |
214 | return fi; | |
215 | } | |
216 | ||
217 | struct fileIdentDesc * | |
218 | udf_get_fileident(void * buffer, int bufsize, int * offset) | |
219 | { | |
220 | struct fileIdentDesc *fi; | |
221 | int lengthThisIdent; | |
222 | uint8_t * ptr; | |
223 | int padlen; | |
224 | ||
225 | if ( (!buffer) || (!offset) ) { | |
226 | udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | ptr = buffer; | |
231 | ||
232 | if ( (*offset > 0) && (*offset < bufsize) ) { | |
233 | ptr += *offset; | |
234 | } | |
235 | fi=(struct fileIdentDesc *)ptr; | |
236 | if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID) | |
237 | { | |
238 | udf_debug("0x%x != TAG_IDENT_FID\n", | |
239 | le16_to_cpu(fi->descTag.tagIdent)); | |
240 | udf_debug("offset: %u sizeof: %lu bufsize: %u\n", | |
241 | *offset, (unsigned long)sizeof(struct fileIdentDesc), bufsize); | |
242 | return NULL; | |
243 | } | |
244 | if ( (*offset + sizeof(struct fileIdentDesc)) > bufsize ) | |
245 | { | |
246 | lengthThisIdent = sizeof(struct fileIdentDesc); | |
247 | } | |
248 | else | |
249 | lengthThisIdent = sizeof(struct fileIdentDesc) + | |
250 | fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); | |
251 | ||
252 | /* we need to figure padding, too! */ | |
253 | padlen = lengthThisIdent % UDF_NAME_PAD; | |
254 | if (padlen) | |
255 | lengthThisIdent += (UDF_NAME_PAD - padlen); | |
256 | *offset = *offset + lengthThisIdent; | |
257 | ||
258 | return fi; | |
259 | } | |
260 | ||
261 | #if 0 | |
262 | static extent_ad * | |
263 | udf_get_fileextent(void * buffer, int bufsize, int * offset) | |
264 | { | |
265 | extent_ad * ext; | |
266 | struct fileEntry *fe; | |
267 | uint8_t * ptr; | |
268 | ||
269 | if ( (!buffer) || (!offset) ) | |
270 | { | |
271 | printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | fe = (struct fileEntry *)buffer; | |
276 | ||
277 | if ( le16_to_cpu(fe->descTag.tagIdent) != TAG_IDENT_FE ) | |
278 | { | |
279 | udf_debug("0x%x != TAG_IDENT_FE\n", | |
280 | le16_to_cpu(fe->descTag.tagIdent)); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | ptr=(uint8_t *)(fe->extendedAttr) + le32_to_cpu(fe->lengthExtendedAttr); | |
285 | ||
286 | if ( (*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)) ) | |
287 | { | |
288 | ptr += *offset; | |
289 | } | |
290 | ||
291 | ext = (extent_ad *)ptr; | |
292 | ||
293 | *offset = *offset + sizeof(extent_ad); | |
294 | return ext; | |
295 | } | |
296 | #endif | |
297 | ||
298 | short_ad * | |
299 | udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, int inc) | |
300 | { | |
301 | short_ad *sa; | |
302 | ||
303 | if ( (!ptr) || (!offset) ) | |
304 | { | |
305 | printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) ) | |
310 | return NULL; | |
311 | else if ((sa = (short_ad *)ptr)->extLength == 0) | |
312 | return NULL; | |
313 | ||
314 | if (inc) | |
315 | *offset += sizeof(short_ad); | |
316 | return sa; | |
317 | } | |
318 | ||
319 | long_ad * | |
320 | udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc) | |
321 | { | |
322 | long_ad *la; | |
323 | ||
324 | if ( (!ptr) || (!offset) ) | |
325 | { | |
326 | printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) ) | |
331 | return NULL; | |
332 | else if ((la = (long_ad *)ptr)->extLength == 0) | |
333 | return NULL; | |
334 | ||
335 | if (inc) | |
336 | *offset += sizeof(long_ad); | |
337 | return la; | |
338 | } |