1 /*
2 * directory.c
3 *
4 * PURPOSE
5 * Directory related functions
6 *
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 *udf_filead_read(struct inode *dir, uint8_t *tmpad,
23 uint8_t ad_size, struct kernel_lb_addr fe_loc,
24 int *pos, int *offset, struct buffer_head **bh,
25 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 brelse(*bh);
39 *error = 1;
40 return NULL;
41 }
42
43 if (*offset == dir->i_sb->s_blocksize) {
44 brelse(*bh);
45 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
46 if (!block)
47 return NULL;
48 *bh = udf_tread(dir->i_sb, block);
49 if (!*bh)
50 return NULL;
51 } else if (*offset > dir->i_sb->s_blocksize) {
52 ad = tmpad;
53
54 remainder = dir->i_sb->s_blocksize - loffset;
55 memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);
56
57 brelse(*bh);
58 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
59 if (!block)
60 return NULL;
61 (*bh) = udf_tread(dir->i_sb, block);
62 if (!*bh)
63 return NULL;
64
65 memcpy((uint8_t *)ad + remainder, (*bh)->b_data,
66 ad_size - remainder);
67 *offset = ad_size - remainder;
68 }
69
70 return ad;
71 }
72 #endif
73
74 struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
75 struct udf_fileident_bh *fibh,
76 struct fileIdentDesc *cfi,
77 struct extent_position *epos,
78 struct kernel_lb_addr *eloc, uint32_t *elen,
79 sector_t *offset)
80 {
81 struct fileIdentDesc *fi;
82 int i, num, block;
83 struct buffer_head *tmp, *bha[16];
84 struct udf_inode_info *iinfo = UDF_I(dir);
85
86 fibh->soffset = fibh->eoffset;
87
88 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
89 fi = udf_get_fileident(iinfo->i_ext.i_data -
90 (iinfo->i_efe ?
91 sizeof(struct extendedFileEntry) :
92 sizeof(struct fileEntry)),
93 dir->i_sb->s_blocksize,
94 &(fibh->eoffset));
95 if (!fi)
96 return NULL;
97
98 *nf_pos += fibh->eoffset - fibh->soffset;
99
100 memcpy((uint8_t *)cfi, (uint8_t *)fi,
101 sizeof(struct fileIdentDesc));
102
103 return fi;
104 }
105
106 if (fibh->eoffset == dir->i_sb->s_blocksize) {
107 int lextoffset = epos->offset;
108 unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
109
110 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
111 (EXT_RECORDED_ALLOCATED >> 30))
112 return NULL;
113
114 block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
115
116 (*offset)++;
117
118 if ((*offset << blocksize_bits) >= *elen)
119 *offset = 0;
120 else
121 epos->offset = lextoffset;
122
123 brelse(fibh->sbh);
124 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
125 if (!fibh->sbh)
126 return NULL;
127 fibh->soffset = fibh->eoffset = 0;
128
129 if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
130 i = 16 >> (blocksize_bits - 9);
131 if (i + *offset > (*elen >> blocksize_bits))
132 i = (*elen >> blocksize_bits)-*offset;
133 for (num = 0; i > 0; i--) {
134 block = udf_get_lb_pblock(dir->i_sb, eloc,
135 *offset + i);
136 tmp = udf_tgetblk(dir->i_sb, block);
137 if (tmp && !buffer_uptodate(tmp) &&
138 !buffer_locked(tmp))
139 bha[num++] = tmp;
140 else
141 brelse(tmp);
142 }
143 if (num) {
144 ll_rw_block(READA, num, bha);
145 for (i = 0; i < num; i++)
146 brelse(bha[i]);
147 }
148 }
149 } else if (fibh->sbh != fibh->ebh) {
150 brelse(fibh->sbh);
151 fibh->sbh = fibh->ebh;
152 }
153
154 fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
155 &(fibh->eoffset));
156
157 if (!fi)
158 return NULL;
159
160 *nf_pos += fibh->eoffset - fibh->soffset;
161
162 if (fibh->eoffset <= dir->i_sb->s_blocksize) {
163 memcpy((uint8_t *)cfi, (uint8_t *)fi,
164 sizeof(struct fileIdentDesc));
165 } else if (fibh->eoffset > dir->i_sb->s_blocksize) {
166 int lextoffset = epos->offset;
167
168 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
169 (EXT_RECORDED_ALLOCATED >> 30))
170 return NULL;
171
172 block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
173
174 (*offset)++;
175
176 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
177 *offset = 0;
178 else
179 epos->offset = lextoffset;
180
181 fibh->soffset -= dir->i_sb->s_blocksize;
182 fibh->eoffset -= dir->i_sb->s_blocksize;
183
184 fibh->ebh = udf_tread(dir->i_sb, block);
185 if (!fibh->ebh)
186 return NULL;
187
188 if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
189 int fi_len;
190
191 memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset);
192 memcpy((uint8_t *)cfi - fibh->soffset,
193 fibh->ebh->b_data,
194 sizeof(struct fileIdentDesc) + fibh->soffset);
195
196 fi_len = (sizeof(struct fileIdentDesc) +
197 cfi->lengthFileIdent +
198 le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
199
200 *nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
201 fibh->eoffset = fibh->soffset + fi_len;
202 } else {
203 memcpy((uint8_t *)cfi, (uint8_t *)fi,
204 sizeof(struct fileIdentDesc));
205 }
206 }
207 return fi;
208 }
209
210 struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset)
211 {
212 struct fileIdentDesc *fi;
213 int lengthThisIdent;
214 uint8_t *ptr;
215 int padlen;
216
217 if ((!buffer) || (!offset)) {
218 udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer,
219 offset);
220 return NULL;
221 }
222
223 ptr = buffer;
224
225 if ((*offset > 0) && (*offset < bufsize))
226 ptr += *offset;
227 fi = (struct fileIdentDesc *)ptr;
228 if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
229 udf_debug("0x%x != TAG_IDENT_FID\n",
230 le16_to_cpu(fi->descTag.tagIdent));
231 udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
232 *offset, (unsigned long)sizeof(struct fileIdentDesc),
233 bufsize);
234 return NULL;
235 }
236 if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
237 lengthThisIdent = sizeof(struct fileIdentDesc);
238 else
239 lengthThisIdent = sizeof(struct fileIdentDesc) +
240 fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
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
252 static struct extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset)
253 {
254 struct extent_ad *ext;
255 struct fileEntry *fe;
256 uint8_t *ptr;
257
258 if ((!buffer) || (!offset)) {
259 printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
260 return NULL;
261 }
262
263 fe = (struct fileEntry *)buffer;
264
265 if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) {
266 udf_debug("0x%x != TAG_IDENT_FE\n",
267 le16_to_cpu(fe->descTag.tagIdent));
268 return NULL;
269 }
270
271 ptr = (uint8_t *)(fe->extendedAttr) +
272 le32_to_cpu(fe->lengthExtendedAttr);
273
274 if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)))
275 ptr += *offset;
276
277 ext = (struct extent_ad *)ptr;
278
279 *offset = *offset + sizeof(struct extent_ad);
280 return ext;
281 }
282 #endif
283
284 struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
285 int inc)
286 {
287 struct short_ad *sa;
288
289 if ((!ptr) || (!offset)) {
290 printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
291 return NULL;
292 }
293
294 if ((*offset + sizeof(struct short_ad)) > maxoffset)
295 return NULL;
296 else {
297 sa = (struct short_ad *)ptr;
298 if (sa->extLength == 0)
299 return NULL;
300 }
301
302 if (inc)
303 *offset += sizeof(struct short_ad);
304 return sa;
305 }
306
307 struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
308 {
309 struct long_ad *la;
310
311 if ((!ptr) || (!offset)) {
312 printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
313 return NULL;
314 }
315
316 if ((*offset + sizeof(struct long_ad)) > maxoffset)
317 return NULL;
318 else {
319 la = (struct long_ad *)ptr;
320 if (la->extLength == 0)
321 return NULL;
322 }
323
324 if (inc)
325 *offset += sizeof(struct long_ad);
326 return la;
327 }
328
|
This page was automatically generated by the
LXR engine.
|