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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 | |
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]; |
48d6d8ff | 84 | struct udf_inode_info *iinfo = UDF_I(dir); |
1da177e4 LT |
85 | |
86 | fibh->soffset = fibh->eoffset; | |
87 | ||
48d6d8ff MS |
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 ? | |
cb00ea35 CG |
91 | sizeof(struct extendedFileEntry) : |
92 | sizeof(struct fileEntry)), | |
4b11111a MS |
93 | dir->i_sb->s_blocksize, |
94 | &(fibh->eoffset)); | |
1da177e4 LT |
95 | if (!fi) |
96 | return NULL; | |
97 | ||
af793295 | 98 | *nf_pos += fibh->eoffset - fibh->soffset; |
1da177e4 | 99 | |
28de7948 | 100 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 | 101 | sizeof(struct fileIdentDesc)); |
1da177e4 LT |
102 | |
103 | return fi; | |
104 | } | |
105 | ||
cb00ea35 | 106 | if (fibh->eoffset == dir->i_sb->s_blocksize) { |
ff116fc8 | 107 | int lextoffset = epos->offset; |
4b11111a | 108 | unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits; |
1da177e4 | 109 | |
ff116fc8 | 110 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 111 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 112 | return NULL; |
1da177e4 LT |
113 | |
114 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
115 | ||
cb00ea35 | 116 | (*offset)++; |
1da177e4 | 117 | |
4b11111a | 118 | if ((*offset << blocksize_bits) >= *elen) |
1da177e4 LT |
119 | *offset = 0; |
120 | else | |
ff116fc8 | 121 | epos->offset = lextoffset; |
1da177e4 | 122 | |
3bf25cb4 | 123 | brelse(fibh->sbh); |
4b11111a MS |
124 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
125 | if (!fibh->sbh) | |
1da177e4 LT |
126 | return NULL; |
127 | fibh->soffset = fibh->eoffset = 0; | |
128 | ||
4b11111a MS |
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; | |
cb00ea35 | 133 | for (num = 0; i > 0; i--) { |
4b11111a MS |
134 | block = udf_get_lb_pblock(dir->i_sb, *eloc, |
135 | *offset + i); | |
1da177e4 | 136 | tmp = udf_tgetblk(dir->i_sb, block); |
4b11111a MS |
137 | if (tmp && !buffer_uptodate(tmp) && |
138 | !buffer_locked(tmp)) | |
1da177e4 LT |
139 | bha[num++] = tmp; |
140 | else | |
141 | brelse(tmp); | |
142 | } | |
cb00ea35 | 143 | if (num) { |
1da177e4 | 144 | ll_rw_block(READA, num, bha); |
cb00ea35 | 145 | for (i = 0; i < num; i++) |
1da177e4 LT |
146 | brelse(bha[i]); |
147 | } | |
148 | } | |
cb00ea35 | 149 | } else if (fibh->sbh != fibh->ebh) { |
3bf25cb4 | 150 | brelse(fibh->sbh); |
1da177e4 LT |
151 | fibh->sbh = fibh->ebh; |
152 | } | |
153 | ||
154 | fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, | |
cb00ea35 | 155 | &(fibh->eoffset)); |
1da177e4 LT |
156 | |
157 | if (!fi) | |
158 | return NULL; | |
159 | ||
af793295 | 160 | *nf_pos += fibh->eoffset - fibh->soffset; |
1da177e4 | 161 | |
cb00ea35 | 162 | if (fibh->eoffset <= dir->i_sb->s_blocksize) { |
28de7948 | 163 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 CG |
164 | sizeof(struct fileIdentDesc)); |
165 | } else if (fibh->eoffset > dir->i_sb->s_blocksize) { | |
ff116fc8 | 166 | int lextoffset = epos->offset; |
1da177e4 | 167 | |
ff116fc8 | 168 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 169 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 170 | return NULL; |
1da177e4 LT |
171 | |
172 | block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); | |
173 | ||
cb00ea35 | 174 | (*offset)++; |
1da177e4 LT |
175 | |
176 | if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) | |
177 | *offset = 0; | |
178 | else | |
ff116fc8 | 179 | epos->offset = lextoffset; |
1da177e4 LT |
180 | |
181 | fibh->soffset -= dir->i_sb->s_blocksize; | |
182 | fibh->eoffset -= dir->i_sb->s_blocksize; | |
183 | ||
4b11111a MS |
184 | fibh->ebh = udf_tread(dir->i_sb, block); |
185 | if (!fibh->ebh) | |
1da177e4 LT |
186 | return NULL; |
187 | ||
cb00ea35 | 188 | if (sizeof(struct fileIdentDesc) > -fibh->soffset) { |
1da177e4 LT |
189 | int fi_len; |
190 | ||
28de7948 | 191 | memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset); |
4b11111a MS |
192 | memcpy((uint8_t *)cfi - fibh->soffset, |
193 | fibh->ebh->b_data, | |
cb00ea35 | 194 | sizeof(struct fileIdentDesc) + fibh->soffset); |
1da177e4 | 195 | |
4b11111a MS |
196 | fi_len = (sizeof(struct fileIdentDesc) + |
197 | cfi->lengthFileIdent + | |
28de7948 | 198 | le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; |
1da177e4 | 199 | |
af793295 | 200 | *nf_pos += fi_len - (fibh->eoffset - fibh->soffset); |
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 | 227 | fi = (struct fileIdentDesc *)ptr; |
5e0f0017 | 228 | if (fi->descTag.tagIdent != cpu_to_le16(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 | ||
5e0f0017 | 265 | if (fe->descTag.tagIdent != cpu_to_le16(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 | ||
1ed16171 | 284 | short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *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 | ||
1ed16171 | 294 | if ((*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 | ||
1ed16171 | 307 | long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *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 | ||
1ed16171 | 316 | if ((*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 | } |