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-rw-r--r--fs/isofs/rock.c962
1 files changed, 581 insertions, 381 deletions
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 089e79c65585..4326cb47f8fa 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -13,352 +13,542 @@
13#include "isofs.h" 13#include "isofs.h"
14#include "rock.h" 14#include "rock.h"
15 15
16/* These functions are designed to read the system areas of a directory record 16/*
17 * These functions are designed to read the system areas of a directory record
17 * and extract relevant information. There are different functions provided 18 * and extract relevant information. There are different functions provided
18 * depending upon what information we need at the time. One function fills 19 * depending upon what information we need at the time. One function fills
19 * out an inode structure, a second one extracts a filename, a third one 20 * out an inode structure, a second one extracts a filename, a third one
20 * returns a symbolic link name, and a fourth one returns the extent number 21 * returns a symbolic link name, and a fourth one returns the extent number
21 * for the file. */ 22 * for the file.
22 23 */
23#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */ 24
24 25#define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
25 26
26/* This is a way of ensuring that we have something in the system 27struct rock_state {
27 use fields that is compatible with Rock Ridge */ 28 void *buffer;
28#define CHECK_SP(FAIL) \ 29 unsigned char *chr;
29 if(rr->u.SP.magic[0] != 0xbe) FAIL; \ 30 int len;
30 if(rr->u.SP.magic[1] != 0xef) FAIL; \ 31 int cont_size;
31 ISOFS_SB(inode->i_sb)->s_rock_offset=rr->u.SP.skip; 32 int cont_extent;
32/* We define a series of macros because each function must do exactly the 33 int cont_offset;
33 same thing in certain places. We use the macros to ensure that everything 34 struct inode *inode;
34 is done correctly */ 35};
35 36
36#define CONTINUE_DECLS \ 37/*
37 int cont_extent = 0, cont_offset = 0, cont_size = 0; \ 38 * This is a way of ensuring that we have something in the system
38 void *buffer = NULL 39 * use fields that is compatible with Rock Ridge. Return zero on success.
39 40 */
40#define CHECK_CE \ 41
41 {cont_extent = isonum_733(rr->u.CE.extent); \ 42static int check_sp(struct rock_ridge *rr, struct inode *inode)
42 cont_offset = isonum_733(rr->u.CE.offset); \
43 cont_size = isonum_733(rr->u.CE.size);}
44
45#define SETUP_ROCK_RIDGE(DE,CHR,LEN) \
46 {LEN= sizeof(struct iso_directory_record) + DE->name_len[0]; \
47 if(LEN & 1) LEN++; \
48 CHR = ((unsigned char *) DE) + LEN; \
49 LEN = *((unsigned char *) DE) - LEN; \
50 if (LEN<0) LEN=0; \
51 if (ISOFS_SB(inode->i_sb)->s_rock_offset!=-1) \
52 { \
53 LEN-=ISOFS_SB(inode->i_sb)->s_rock_offset; \
54 CHR+=ISOFS_SB(inode->i_sb)->s_rock_offset; \
55 if (LEN<0) LEN=0; \
56 } \
57}
58
59#define MAYBE_CONTINUE(LABEL,DEV) \
60 {if (buffer) { kfree(buffer); buffer = NULL; } \
61 if (cont_extent){ \
62 int block, offset, offset1; \
63 struct buffer_head * pbh; \
64 buffer = kmalloc(cont_size,GFP_KERNEL); \
65 if (!buffer) goto out; \
66 block = cont_extent; \
67 offset = cont_offset; \
68 offset1 = 0; \
69 pbh = sb_bread(DEV->i_sb, block); \
70 if(pbh){ \
71 if (offset > pbh->b_size || offset + cont_size > pbh->b_size){ \
72 brelse(pbh); \
73 goto out; \
74 } \
75 memcpy(buffer + offset1, pbh->b_data + offset, cont_size - offset1); \
76 brelse(pbh); \
77 chr = (unsigned char *) buffer; \
78 len = cont_size; \
79 cont_extent = 0; \
80 cont_size = 0; \
81 cont_offset = 0; \
82 goto LABEL; \
83 } \
84 printk("Unable to read rock-ridge attributes\n"); \
85 }}
86
87/* return length of name field; 0: not found, -1: to be ignored */
88int get_rock_ridge_filename(struct iso_directory_record * de,
89 char * retname, struct inode * inode)
90{ 43{
91 int len; 44 if (rr->u.SP.magic[0] != 0xbe)
92 unsigned char * chr; 45 return -1;
93 CONTINUE_DECLS; 46 if (rr->u.SP.magic[1] != 0xef)
94 int retnamlen = 0, truncate=0; 47 return -1;
95 48 ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip;
96 if (!ISOFS_SB(inode->i_sb)->s_rock) return 0; 49 return 0;
97 *retname = 0; 50}
98 51
99 SETUP_ROCK_RIDGE(de, chr, len); 52static void setup_rock_ridge(struct iso_directory_record *de,
100 repeat: 53 struct inode *inode, struct rock_state *rs)
101 { 54{
102 struct rock_ridge * rr; 55 rs->len = sizeof(struct iso_directory_record) + de->name_len[0];
103 int sig; 56 if (rs->len & 1)
104 57 (rs->len)++;
105 while (len > 2){ /* There may be one byte for padding somewhere */ 58 rs->chr = (unsigned char *)de + rs->len;
106 rr = (struct rock_ridge *) chr; 59 rs->len = *((unsigned char *)de) - rs->len;
107 if (rr->len < 3) goto out; /* Something got screwed up here */ 60 if (rs->len < 0)
108 sig = isonum_721(chr); 61 rs->len = 0;
109 chr += rr->len; 62
110 len -= rr->len; 63 if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) {
111 if (len < 0) goto out; /* corrupted isofs */ 64 rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
112 65 rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
113 switch(sig){ 66 if (rs->len < 0)
114 case SIG('R','R'): 67 rs->len = 0;
115 if((rr->u.RR.flags[0] & RR_NM) == 0) goto out; 68 }
116 break; 69}
117 case SIG('S','P'): 70
118 CHECK_SP(goto out); 71static void init_rock_state(struct rock_state *rs, struct inode *inode)
119 break; 72{
120 case SIG('C','E'): 73 memset(rs, 0, sizeof(*rs));
121 CHECK_CE; 74 rs->inode = inode;
122 break; 75}
123 case SIG('N','M'): 76
124 if (truncate) break; 77/*
125 if (rr->len < 5) break; 78 * Returns 0 if the caller should continue scanning, 1 if the scan must end
126 /* 79 * and -ve on error.
127 * If the flags are 2 or 4, this indicates '.' or '..'. 80 */
128 * We don't want to do anything with this, because it 81static int rock_continue(struct rock_state *rs)
129 * screws up the code that calls us. We don't really 82{
130 * care anyways, since we can just use the non-RR 83 int ret = 1;
131 * name. 84 int blocksize = 1 << rs->inode->i_blkbits;
132 */ 85 const int min_de_size = offsetof(struct rock_ridge, u);
133 if (rr->u.NM.flags & 6) { 86
134 break; 87 kfree(rs->buffer);
88 rs->buffer = NULL;
89
90 if ((unsigned)rs->cont_offset > blocksize - min_de_size ||
91 (unsigned)rs->cont_size > blocksize ||
92 (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) {
93 printk(KERN_NOTICE "rock: corrupted directory entry. "
94 "extent=%d, offset=%d, size=%d\n",
95 rs->cont_extent, rs->cont_offset, rs->cont_size);
96 ret = -EIO;
97 goto out;
135 } 98 }
136 99
137 if (rr->u.NM.flags & ~1) { 100 if (rs->cont_extent) {
138 printk("Unsupported NM flag settings (%d)\n",rr->u.NM.flags); 101 struct buffer_head *bh;
139 break; 102
103 rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL);
104 if (!rs->buffer) {
105 ret = -ENOMEM;
106 goto out;
107 }
108 ret = -EIO;
109 bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
110 if (bh) {
111 memcpy(rs->buffer, bh->b_data + rs->cont_offset,
112 rs->cont_size);
113 put_bh(bh);
114 rs->chr = rs->buffer;
115 rs->len = rs->cont_size;
116 rs->cont_extent = 0;
117 rs->cont_size = 0;
118 rs->cont_offset = 0;
119 return 0;
120 }
121 printk("Unable to read rock-ridge attributes\n");
122 }
123out:
124 kfree(rs->buffer);
125 rs->buffer = NULL;
126 return ret;
127}
128
129/*
130 * We think there's a record of type `sig' at rs->chr. Parse the signature
131 * and make sure that there's really room for a record of that type.
132 */
133static int rock_check_overflow(struct rock_state *rs, int sig)
134{
135 int len;
136
137 switch (sig) {
138 case SIG('S', 'P'):
139 len = sizeof(struct SU_SP_s);
140 break;
141 case SIG('C', 'E'):
142 len = sizeof(struct SU_CE_s);
143 break;
144 case SIG('E', 'R'):
145 len = sizeof(struct SU_ER_s);
146 break;
147 case SIG('R', 'R'):
148 len = sizeof(struct RR_RR_s);
149 break;
150 case SIG('P', 'X'):
151 len = sizeof(struct RR_PX_s);
152 break;
153 case SIG('P', 'N'):
154 len = sizeof(struct RR_PN_s);
155 break;
156 case SIG('S', 'L'):
157 len = sizeof(struct RR_SL_s);
158 break;
159 case SIG('N', 'M'):
160 len = sizeof(struct RR_NM_s);
161 break;
162 case SIG('C', 'L'):
163 len = sizeof(struct RR_CL_s);
164 break;
165 case SIG('P', 'L'):
166 len = sizeof(struct RR_PL_s);
167 break;
168 case SIG('T', 'F'):
169 len = sizeof(struct RR_TF_s);
170 break;
171 case SIG('Z', 'F'):
172 len = sizeof(struct RR_ZF_s);
173 break;
174 default:
175 len = 0;
176 break;
140 } 177 }
141 if((strlen(retname) + rr->len - 5) >= 254) { 178 len += offsetof(struct rock_ridge, u);
142 truncate = 1; 179 if (len > rs->len) {
143 break; 180 printk(KERN_NOTICE "rock: directory entry would overflow "
181 "storage\n");
182 printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n",
183 sig, len, rs->len);
184 return -EIO;
185 }
186 return 0;
187}
188
189/*
190 * return length of name field; 0: not found, -1: to be ignored
191 */
192int get_rock_ridge_filename(struct iso_directory_record *de,
193 char *retname, struct inode *inode)
194{
195 struct rock_state rs;
196 struct rock_ridge *rr;
197 int sig;
198 int retnamlen = 0;
199 int truncate = 0;
200 int ret = 0;
201
202 if (!ISOFS_SB(inode->i_sb)->s_rock)
203 return 0;
204 *retname = 0;
205
206 init_rock_state(&rs, inode);
207 setup_rock_ridge(de, inode, &rs);
208repeat:
209
210 while (rs.len > 2) { /* There may be one byte for padding somewhere */
211 rr = (struct rock_ridge *)rs.chr;
212 if (rr->len < 3)
213 goto out; /* Something got screwed up here */
214 sig = isonum_721(rs.chr);
215 if (rock_check_overflow(&rs, sig))
216 goto eio;
217 rs.chr += rr->len;
218 rs.len -= rr->len;
219 if (rs.len < 0)
220 goto eio; /* corrupted isofs */
221
222 switch (sig) {
223 case SIG('R', 'R'):
224 if ((rr->u.RR.flags[0] & RR_NM) == 0)
225 goto out;
226 break;
227 case SIG('S', 'P'):
228 if (check_sp(rr, inode))
229 goto out;
230 break;
231 case SIG('C', 'E'):
232 rs.cont_extent = isonum_733(rr->u.CE.extent);
233 rs.cont_offset = isonum_733(rr->u.CE.offset);
234 rs.cont_size = isonum_733(rr->u.CE.size);
235 break;
236 case SIG('N', 'M'):
237 if (truncate)
238 break;
239 if (rr->len < 5)
240 break;
241 /*
242 * If the flags are 2 or 4, this indicates '.' or '..'.
243 * We don't want to do anything with this, because it
244 * screws up the code that calls us. We don't really
245 * care anyways, since we can just use the non-RR
246 * name.
247 */
248 if (rr->u.NM.flags & 6)
249 break;
250
251 if (rr->u.NM.flags & ~1) {
252 printk("Unsupported NM flag settings (%d)\n",
253 rr->u.NM.flags);
254 break;
255 }
256 if ((strlen(retname) + rr->len - 5) >= 254) {
257 truncate = 1;
258 break;
259 }
260 strncat(retname, rr->u.NM.name, rr->len - 5);
261 retnamlen += rr->len - 5;
262 break;
263 case SIG('R', 'E'):
264 kfree(rs.buffer);
265 return -1;
266 default:
267 break;
268 }
144 } 269 }
145 strncat(retname, rr->u.NM.name, rr->len - 5); 270 ret = rock_continue(&rs);
146 retnamlen += rr->len - 5; 271 if (ret == 0)
147 break; 272 goto repeat;
148 case SIG('R','E'): 273 if (ret == 1)
149 if (buffer) kfree(buffer); 274 return retnamlen; /* If 0, this file did not have a NM field */
150 return -1; 275out:
151 default: 276 kfree(rs.buffer);
152 break; 277 return ret;
153 } 278eio:
154 } 279 ret = -EIO;
155 } 280 goto out;
156 MAYBE_CONTINUE(repeat,inode);
157 if (buffer) kfree(buffer);
158 return retnamlen; /* If 0, this file did not have a NM field */
159 out:
160 if(buffer) kfree(buffer);
161 return 0;
162} 281}
163 282
164static int 283static int
165parse_rock_ridge_inode_internal(struct iso_directory_record *de, 284parse_rock_ridge_inode_internal(struct iso_directory_record *de,
166 struct inode *inode, int regard_xa) 285 struct inode *inode, int regard_xa)
167{ 286{
168 int len; 287 int symlink_len = 0;
169 unsigned char * chr; 288 int cnt, sig;
170 int symlink_len = 0; 289 struct inode *reloc;
171 CONTINUE_DECLS; 290 struct rock_ridge *rr;
172 291 int rootflag;
173 if (!ISOFS_SB(inode->i_sb)->s_rock) return 0; 292 struct rock_state rs;
174 293 int ret = 0;
175 SETUP_ROCK_RIDGE(de, chr, len); 294
176 if (regard_xa) 295 if (!ISOFS_SB(inode->i_sb)->s_rock)
177 { 296 return 0;
178 chr+=14; 297
179 len-=14; 298 init_rock_state(&rs, inode);
180 if (len<0) len=0; 299 setup_rock_ridge(de, inode, &rs);
181 } 300 if (regard_xa) {
182 301 rs.chr += 14;
183 repeat: 302 rs.len -= 14;
184 { 303 if (rs.len < 0)
185 int cnt, sig; 304 rs.len = 0;
186 struct inode * reloc; 305 }
187 struct rock_ridge * rr; 306
188 int rootflag; 307repeat:
189 308 while (rs.len > 2) { /* There may be one byte for padding somewhere */
190 while (len > 2){ /* There may be one byte for padding somewhere */ 309 rr = (struct rock_ridge *)rs.chr;
191 rr = (struct rock_ridge *) chr; 310 if (rr->len < 3)
192 if (rr->len < 3) goto out; /* Something got screwed up here */ 311 goto out; /* Something got screwed up here */
193 sig = isonum_721(chr); 312 sig = isonum_721(rs.chr);
194 chr += rr->len; 313 if (rock_check_overflow(&rs, sig))
195 len -= rr->len; 314 goto eio;
196 if (len < 0) goto out; /* corrupted isofs */ 315 rs.chr += rr->len;
197 316 rs.len -= rr->len;
198 switch(sig){ 317 if (rs.len < 0)
318 goto eio; /* corrupted isofs */
319
320 switch (sig) {
199#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */ 321#ifndef CONFIG_ZISOFS /* No flag for SF or ZF */
200 case SIG('R','R'): 322 case SIG('R', 'R'):
201 if((rr->u.RR.flags[0] & 323 if ((rr->u.RR.flags[0] &
202 (RR_PX | RR_TF | RR_SL | RR_CL)) == 0) goto out; 324 (RR_PX | RR_TF | RR_SL | RR_CL)) == 0)
203 break; 325 goto out;
326 break;
204#endif 327#endif
205 case SIG('S','P'): 328 case SIG('S', 'P'):
206 CHECK_SP(goto out); 329 if (check_sp(rr, inode))
207 break; 330 goto out;
208 case SIG('C','E'): 331 break;
209 CHECK_CE; 332 case SIG('C', 'E'):
210 break; 333 rs.cont_extent = isonum_733(rr->u.CE.extent);
211 case SIG('E','R'): 334 rs.cont_offset = isonum_733(rr->u.CE.offset);
212 ISOFS_SB(inode->i_sb)->s_rock = 1; 335 rs.cont_size = isonum_733(rr->u.CE.size);
213 printk(KERN_DEBUG "ISO 9660 Extensions: "); 336 break;
214 { int p; 337 case SIG('E', 'R'):
215 for(p=0;p<rr->u.ER.len_id;p++) printk("%c",rr->u.ER.data[p]); 338 ISOFS_SB(inode->i_sb)->s_rock = 1;
216 } 339 printk(KERN_DEBUG "ISO 9660 Extensions: ");
217 printk("\n"); 340 {
218 break; 341 int p;
219 case SIG('P','X'): 342 for (p = 0; p < rr->u.ER.len_id; p++)
220 inode->i_mode = isonum_733(rr->u.PX.mode); 343 printk("%c", rr->u.ER.data[p]);
221 inode->i_nlink = isonum_733(rr->u.PX.n_links); 344 }
222 inode->i_uid = isonum_733(rr->u.PX.uid); 345 printk("\n");
223 inode->i_gid = isonum_733(rr->u.PX.gid); 346 break;
224 break; 347 case SIG('P', 'X'):
225 case SIG('P','N'): 348 inode->i_mode = isonum_733(rr->u.PX.mode);
226 { int high, low; 349 inode->i_nlink = isonum_733(rr->u.PX.n_links);
227 high = isonum_733(rr->u.PN.dev_high); 350 inode->i_uid = isonum_733(rr->u.PX.uid);
228 low = isonum_733(rr->u.PN.dev_low); 351 inode->i_gid = isonum_733(rr->u.PX.gid);
229 /* 352 break;
230 * The Rock Ridge standard specifies that if sizeof(dev_t) <= 4, 353 case SIG('P', 'N'):
231 * then the high field is unused, and the device number is completely 354 {
232 * stored in the low field. Some writers may ignore this subtlety, 355 int high, low;
233 * and as a result we test to see if the entire device number is 356 high = isonum_733(rr->u.PN.dev_high);
234 * stored in the low field, and use that. 357 low = isonum_733(rr->u.PN.dev_low);
235 */ 358 /*
236 if((low & ~0xff) && high == 0) { 359 * The Rock Ridge standard specifies that if
237 inode->i_rdev = MKDEV(low >> 8, low & 0xff); 360 * sizeof(dev_t) <= 4, then the high field is
238 } else { 361 * unused, and the device number is completely
239 inode->i_rdev = MKDEV(high, low); 362 * stored in the low field. Some writers may
240 } 363 * ignore this subtlety,
241 } 364 * and as a result we test to see if the entire
242 break; 365 * device number is
243 case SIG('T','F'): 366 * stored in the low field, and use that.
244 /* Some RRIP writers incorrectly place ctime in the TF_CREATE field. 367 */
245 Try to handle this correctly for either case. */ 368 if ((low & ~0xff) && high == 0) {
246 cnt = 0; /* Rock ridge never appears on a High Sierra disk */ 369 inode->i_rdev =
247 if(rr->u.TF.flags & TF_CREATE) { 370 MKDEV(low >> 8, low & 0xff);
248 inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0); 371 } else {
249 inode->i_ctime.tv_nsec = 0; 372 inode->i_rdev =
250 } 373 MKDEV(high, low);
251 if(rr->u.TF.flags & TF_MODIFY) { 374 }
252 inode->i_mtime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0); 375 }
253 inode->i_mtime.tv_nsec = 0; 376 break;
254 } 377 case SIG('T', 'F'):
255 if(rr->u.TF.flags & TF_ACCESS) { 378 /*
256 inode->i_atime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0); 379 * Some RRIP writers incorrectly place ctime in the
257 inode->i_atime.tv_nsec = 0; 380 * TF_CREATE field. Try to handle this correctly for
258 } 381 * either case.
259 if(rr->u.TF.flags & TF_ATTRIBUTES) { 382 */
260 inode->i_ctime.tv_sec = iso_date(rr->u.TF.times[cnt++].time, 0); 383 /* Rock ridge never appears on a High Sierra disk */
261 inode->i_ctime.tv_nsec = 0; 384 cnt = 0;
262 } 385 if (rr->u.TF.flags & TF_CREATE) {
263 break; 386 inode->i_ctime.tv_sec =
264 case SIG('S','L'): 387 iso_date(rr->u.TF.times[cnt++].time,
265 {int slen; 388 0);
266 struct SL_component * slp; 389 inode->i_ctime.tv_nsec = 0;
267 struct SL_component * oldslp; 390 }
268 slen = rr->len - 5; 391 if (rr->u.TF.flags & TF_MODIFY) {
269 slp = &rr->u.SL.link; 392 inode->i_mtime.tv_sec =
270 inode->i_size = symlink_len; 393 iso_date(rr->u.TF.times[cnt++].time,
271 while (slen > 1){ 394 0);
272 rootflag = 0; 395 inode->i_mtime.tv_nsec = 0;
273 switch(slp->flags &~1){ 396 }
274 case 0: 397 if (rr->u.TF.flags & TF_ACCESS) {
275 inode->i_size += slp->len; 398 inode->i_atime.tv_sec =
276 break; 399 iso_date(rr->u.TF.times[cnt++].time,
277 case 2: 400 0);
278 inode->i_size += 1; 401 inode->i_atime.tv_nsec = 0;
279 break; 402 }
280 case 4: 403 if (rr->u.TF.flags & TF_ATTRIBUTES) {
281 inode->i_size += 2; 404 inode->i_ctime.tv_sec =
282 break; 405 iso_date(rr->u.TF.times[cnt++].time,
283 case 8: 406 0);
284 rootflag = 1; 407 inode->i_ctime.tv_nsec = 0;
285 inode->i_size += 1; 408 }
286 break; 409 break;
287 default: 410 case SIG('S', 'L'):
288 printk("Symlink component flag not implemented\n"); 411 {
289 } 412 int slen;
290 slen -= slp->len + 2; 413 struct SL_component *slp;
291 oldslp = slp; 414 struct SL_component *oldslp;
292 slp = (struct SL_component *) (((char *) slp) + slp->len + 2); 415 slen = rr->len - 5;
293 416 slp = &rr->u.SL.link;
294 if(slen < 2) { 417 inode->i_size = symlink_len;
295 if( ((rr->u.SL.flags & 1) != 0) 418 while (slen > 1) {
296 && ((oldslp->flags & 1) == 0) ) inode->i_size += 1; 419 rootflag = 0;
297 break; 420 switch (slp->flags & ~1) {
298 } 421 case 0:
299 422 inode->i_size +=
300 /* 423 slp->len;
301 * If this component record isn't continued, then append a '/'. 424 break;
302 */ 425 case 2:
303 if (!rootflag && (oldslp->flags & 1) == 0) 426 inode->i_size += 1;
304 inode->i_size += 1; 427 break;
305 } 428 case 4:
306 } 429 inode->i_size += 2;
307 symlink_len = inode->i_size; 430 break;
308 break; 431 case 8:
309 case SIG('R','E'): 432 rootflag = 1;
310 printk(KERN_WARNING "Attempt to read inode for relocated directory\n"); 433 inode->i_size += 1;
311 goto out; 434 break;
312 case SIG('C','L'): 435 default:
313 ISOFS_I(inode)->i_first_extent = isonum_733(rr->u.CL.location); 436 printk("Symlink component flag "
314 reloc = isofs_iget(inode->i_sb, ISOFS_I(inode)->i_first_extent, 0); 437 "not implemented\n");
315 if (!reloc) 438 }
316 goto out; 439 slen -= slp->len + 2;
317 inode->i_mode = reloc->i_mode; 440 oldslp = slp;
318 inode->i_nlink = reloc->i_nlink; 441 slp = (struct SL_component *)
319 inode->i_uid = reloc->i_uid; 442 (((char *)slp) + slp->len + 2);
320 inode->i_gid = reloc->i_gid; 443
321 inode->i_rdev = reloc->i_rdev; 444 if (slen < 2) {
322 inode->i_size = reloc->i_size; 445 if (((rr->u.SL.
323 inode->i_blocks = reloc->i_blocks; 446 flags & 1) != 0)
324 inode->i_atime = reloc->i_atime; 447 &&
325 inode->i_ctime = reloc->i_ctime; 448 ((oldslp->
326 inode->i_mtime = reloc->i_mtime; 449 flags & 1) == 0))
327 iput(reloc); 450 inode->i_size +=
328 break; 451 1;
452 break;
453 }
454
455 /*
456 * If this component record isn't
457 * continued, then append a '/'.
458 */
459 if (!rootflag
460 && (oldslp->flags & 1) == 0)
461 inode->i_size += 1;
462 }
463 }
464 symlink_len = inode->i_size;
465 break;
466 case SIG('R', 'E'):
467 printk(KERN_WARNING "Attempt to read inode for "
468 "relocated directory\n");
469 goto out;
470 case SIG('C', 'L'):
471 ISOFS_I(inode)->i_first_extent =
472 isonum_733(rr->u.CL.location);
473 reloc =
474 isofs_iget(inode->i_sb,
475 ISOFS_I(inode)->i_first_extent,
476 0);
477 if (!reloc)
478 goto out;
479 inode->i_mode = reloc->i_mode;
480 inode->i_nlink = reloc->i_nlink;
481 inode->i_uid = reloc->i_uid;
482 inode->i_gid = reloc->i_gid;
483 inode->i_rdev = reloc->i_rdev;
484 inode->i_size = reloc->i_size;
485 inode->i_blocks = reloc->i_blocks;
486 inode->i_atime = reloc->i_atime;
487 inode->i_ctime = reloc->i_ctime;
488 inode->i_mtime = reloc->i_mtime;
489 iput(reloc);
490 break;
329#ifdef CONFIG_ZISOFS 491#ifdef CONFIG_ZISOFS
330 case SIG('Z','F'): 492 case SIG('Z', 'F'): {
331 if ( !ISOFS_SB(inode->i_sb)->s_nocompress ) { 493 int algo;
332 int algo; 494
333 algo = isonum_721(rr->u.ZF.algorithm); 495 if (ISOFS_SB(inode->i_sb)->s_nocompress)
334 if ( algo == SIG('p','z') ) { 496 break;
335 int block_shift = isonum_711(&rr->u.ZF.parms[1]); 497 algo = isonum_721(rr->u.ZF.algorithm);
336 if ( block_shift < PAGE_CACHE_SHIFT || block_shift > 17 ) { 498 if (algo == SIG('p', 'z')) {
337 printk(KERN_WARNING "isofs: Can't handle ZF block size of 2^%d\n", block_shift); 499 int block_shift =
338 } else { 500 isonum_711(&rr->u.ZF.parms[1]);
339 /* Note: we don't change i_blocks here */ 501 if (block_shift < PAGE_CACHE_SHIFT
340 ISOFS_I(inode)->i_file_format = isofs_file_compressed; 502 || block_shift > 17) {
341 /* Parameters to compression algorithm (header size, block size) */ 503 printk(KERN_WARNING "isofs: "
342 ISOFS_I(inode)->i_format_parm[0] = isonum_711(&rr->u.ZF.parms[0]); 504 "Can't handle ZF block "
343 ISOFS_I(inode)->i_format_parm[1] = isonum_711(&rr->u.ZF.parms[1]); 505 "size of 2^%d\n",
344 inode->i_size = isonum_733(rr->u.ZF.real_size); 506 block_shift);
345 } 507 } else {
346 } else { 508 /*
347 printk(KERN_WARNING "isofs: Unknown ZF compression algorithm: %c%c\n", 509 * Note: we don't change
348 rr->u.ZF.algorithm[0], rr->u.ZF.algorithm[1]); 510 * i_blocks here
349 } 511 */
350 } 512 ISOFS_I(inode)->i_file_format =
351 break; 513 isofs_file_compressed;
514 /*
515 * Parameters to compression
516 * algorithm (header size,
517 * block size)
518 */
519 ISOFS_I(inode)->i_format_parm[0] =
520 isonum_711(&rr->u.ZF.parms[0]);
521 ISOFS_I(inode)->i_format_parm[1] =
522 isonum_711(&rr->u.ZF.parms[1]);
523 inode->i_size =
524 isonum_733(rr->u.ZF.
525 real_size);
526 }
527 } else {
528 printk(KERN_WARNING
529 "isofs: Unknown ZF compression "
530 "algorithm: %c%c\n",
531 rr->u.ZF.algorithm[0],
532 rr->u.ZF.algorithm[1]);
533 }
534 break;
535 }
352#endif 536#endif
353 default: 537 default:
354 break; 538 break;
355 } 539 }
356 } 540 }
357 } 541 ret = rock_continue(&rs);
358 MAYBE_CONTINUE(repeat,inode); 542 if (ret == 0)
359 out: 543 goto repeat;
360 if(buffer) kfree(buffer); 544 if (ret == 1)
361 return 0; 545 ret = 0;
546out:
547 kfree(rs.buffer);
548 return ret;
549eio:
550 ret = -EIO;
551 goto out;
362} 552}
363 553
364static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit) 554static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
@@ -376,32 +566,32 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
376 if (slp->len > plimit - rpnt) 566 if (slp->len > plimit - rpnt)
377 return NULL; 567 return NULL;
378 memcpy(rpnt, slp->text, slp->len); 568 memcpy(rpnt, slp->text, slp->len);
379 rpnt+=slp->len; 569 rpnt += slp->len;
380 break; 570 break;
381 case 2: 571 case 2:
382 if (rpnt >= plimit) 572 if (rpnt >= plimit)
383 return NULL; 573 return NULL;
384 *rpnt++='.'; 574 *rpnt++ = '.';
385 break; 575 break;
386 case 4: 576 case 4:
387 if (2 > plimit - rpnt) 577 if (2 > plimit - rpnt)
388 return NULL; 578 return NULL;
389 *rpnt++='.'; 579 *rpnt++ = '.';
390 *rpnt++='.'; 580 *rpnt++ = '.';
391 break; 581 break;
392 case 8: 582 case 8:
393 if (rpnt >= plimit) 583 if (rpnt >= plimit)
394 return NULL; 584 return NULL;
395 rootflag = 1; 585 rootflag = 1;
396 *rpnt++='/'; 586 *rpnt++ = '/';
397 break; 587 break;
398 default: 588 default:
399 printk("Symlink component flag not implemented (%d)\n", 589 printk("Symlink component flag not implemented (%d)\n",
400 slp->flags); 590 slp->flags);
401 } 591 }
402 slen -= slp->len + 2; 592 slen -= slp->len + 2;
403 oldslp = slp; 593 oldslp = slp;
404 slp = (struct SL_component *) ((char *) slp + slp->len + 2); 594 slp = (struct SL_component *)((char *)slp + slp->len + 2);
405 595
406 if (slen < 2) { 596 if (slen < 2) {
407 /* 597 /*
@@ -412,7 +602,7 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
412 !(oldslp->flags & 1)) { 602 !(oldslp->flags & 1)) {
413 if (rpnt >= plimit) 603 if (rpnt >= plimit)
414 return NULL; 604 return NULL;
415 *rpnt++='/'; 605 *rpnt++ = '/';
416 } 606 }
417 break; 607 break;
418 } 608 }
@@ -423,59 +613,61 @@ static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
423 if (!rootflag && !(oldslp->flags & 1)) { 613 if (!rootflag && !(oldslp->flags & 1)) {
424 if (rpnt >= plimit) 614 if (rpnt >= plimit)
425 return NULL; 615 return NULL;
426 *rpnt++='/'; 616 *rpnt++ = '/';
427 } 617 }
428 } 618 }
429 return rpnt; 619 return rpnt;
430} 620}
431 621
432int parse_rock_ridge_inode(struct iso_directory_record * de, 622int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode)
433 struct inode * inode)
434{ 623{
435 int result=parse_rock_ridge_inode_internal(de,inode,0); 624 int result = parse_rock_ridge_inode_internal(de, inode, 0);
436 /* if rockridge flag was reset and we didn't look for attributes
437 * behind eventual XA attributes, have a look there */
438 if ((ISOFS_SB(inode->i_sb)->s_rock_offset==-1)
439 &&(ISOFS_SB(inode->i_sb)->s_rock==2))
440 {
441 result=parse_rock_ridge_inode_internal(de,inode,14);
442 }
443 return result;
444}
445 625
446/* readpage() for symlinks: reads symlink contents into the page and either 626 /*
447 makes it uptodate and returns 0 or returns error (-EIO) */ 627 * if rockridge flag was reset and we didn't look for attributes
628 * behind eventual XA attributes, have a look there
629 */
630 if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1)
631 && (ISOFS_SB(inode->i_sb)->s_rock == 2)) {
632 result = parse_rock_ridge_inode_internal(de, inode, 14);
633 }
634 return result;
635}
448 636
637/*
638 * readpage() for symlinks: reads symlink contents into the page and either
639 * makes it uptodate and returns 0 or returns error (-EIO)
640 */
449static int rock_ridge_symlink_readpage(struct file *file, struct page *page) 641static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
450{ 642{
451 struct inode *inode = page->mapping->host; 643 struct inode *inode = page->mapping->host;
452 struct iso_inode_info *ei = ISOFS_I(inode); 644 struct iso_inode_info *ei = ISOFS_I(inode);
453 char *link = kmap(page); 645 char *link = kmap(page);
454 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 646 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
455 struct buffer_head *bh; 647 struct buffer_head *bh;
456 char *rpnt = link; 648 char *rpnt = link;
457 unsigned char *pnt; 649 unsigned char *pnt;
458 struct iso_directory_record *raw_inode; 650 struct iso_directory_record *raw_de;
459 CONTINUE_DECLS;
460 unsigned long block, offset; 651 unsigned long block, offset;
461 int sig; 652 int sig;
462 int len;
463 unsigned char *chr;
464 struct rock_ridge *rr; 653 struct rock_ridge *rr;
654 struct rock_state rs;
655 int ret;
465 656
466 if (!ISOFS_SB(inode->i_sb)->s_rock) 657 if (!ISOFS_SB(inode->i_sb)->s_rock)
467 goto error; 658 goto error;
468 659
660 init_rock_state(&rs, inode);
469 block = ei->i_iget5_block; 661 block = ei->i_iget5_block;
470 lock_kernel(); 662 lock_kernel();
471 bh = sb_bread(inode->i_sb, block); 663 bh = sb_bread(inode->i_sb, block);
472 if (!bh) 664 if (!bh)
473 goto out_noread; 665 goto out_noread;
474 666
475 offset = ei->i_iget5_offset; 667 offset = ei->i_iget5_offset;
476 pnt = (unsigned char *) bh->b_data + offset; 668 pnt = (unsigned char *)bh->b_data + offset;
477 669
478 raw_inode = (struct iso_directory_record *) pnt; 670 raw_de = (struct iso_directory_record *)pnt;
479 671
480 /* 672 /*
481 * If we go past the end of the buffer, there is some sort of error. 673 * If we go past the end of the buffer, there is some sort of error.
@@ -483,20 +675,24 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
483 if (offset + *pnt > bufsize) 675 if (offset + *pnt > bufsize)
484 goto out_bad_span; 676 goto out_bad_span;
485 677
486 /* Now test for possible Rock Ridge extensions which will override 678 /*
487 some of these numbers in the inode structure. */ 679 * Now test for possible Rock Ridge extensions which will override
680 * some of these numbers in the inode structure.
681 */
488 682
489 SETUP_ROCK_RIDGE(raw_inode, chr, len); 683 setup_rock_ridge(raw_de, inode, &rs);
490 684
491 repeat: 685repeat:
492 while (len > 2) { /* There may be one byte for padding somewhere */ 686 while (rs.len > 2) { /* There may be one byte for padding somewhere */
493 rr = (struct rock_ridge *) chr; 687 rr = (struct rock_ridge *)rs.chr;
494 if (rr->len < 3) 688 if (rr->len < 3)
495 goto out; /* Something got screwed up here */ 689 goto out; /* Something got screwed up here */
496 sig = isonum_721(chr); 690 sig = isonum_721(rs.chr);
497 chr += rr->len; 691 if (rock_check_overflow(&rs, sig))
498 len -= rr->len; 692 goto out;
499 if (len < 0) 693 rs.chr += rr->len;
694 rs.len -= rr->len;
695 if (rs.len < 0)
500 goto out; /* corrupted isofs */ 696 goto out; /* corrupted isofs */
501 697
502 switch (sig) { 698 switch (sig) {
@@ -505,7 +701,8 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
505 goto out; 701 goto out;
506 break; 702 break;
507 case SIG('S', 'P'): 703 case SIG('S', 'P'):
508 CHECK_SP(goto out); 704 if (check_sp(rr, inode))
705 goto out;
509 break; 706 break;
510 case SIG('S', 'L'): 707 case SIG('S', 'L'):
511 rpnt = get_symlink_chunk(rpnt, rr, 708 rpnt = get_symlink_chunk(rpnt, rr,
@@ -515,14 +712,18 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
515 break; 712 break;
516 case SIG('C', 'E'): 713 case SIG('C', 'E'):
517 /* This tells is if there is a continuation record */ 714 /* This tells is if there is a continuation record */
518 CHECK_CE; 715 rs.cont_extent = isonum_733(rr->u.CE.extent);
716 rs.cont_offset = isonum_733(rr->u.CE.offset);
717 rs.cont_size = isonum_733(rr->u.CE.size);
519 default: 718 default:
520 break; 719 break;
521 } 720 }
522 } 721 }
523 MAYBE_CONTINUE(repeat, inode); 722 ret = rock_continue(&rs);
524 if (buffer) 723 if (ret == 0)
525 kfree(buffer); 724 goto repeat;
725 if (ret < 0)
726 goto fail;
526 727
527 if (rpnt == link) 728 if (rpnt == link)
528 goto fail; 729 goto fail;
@@ -535,19 +736,18 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
535 return 0; 736 return 0;
536 737
537 /* error exit from macro */ 738 /* error exit from macro */
538 out: 739out:
539 if (buffer) 740 kfree(rs.buffer);
540 kfree(buffer);
541 goto fail; 741 goto fail;
542 out_noread: 742out_noread:
543 printk("unable to read i-node block"); 743 printk("unable to read i-node block");
544 goto fail; 744 goto fail;
545 out_bad_span: 745out_bad_span:
546 printk("symlink spans iso9660 blocks\n"); 746 printk("symlink spans iso9660 blocks\n");
547 fail: 747fail:
548 brelse(bh); 748 brelse(bh);
549 unlock_kernel(); 749 unlock_kernel();
550 error: 750error:
551 SetPageError(page); 751 SetPageError(page);
552 kunmap(page); 752 kunmap(page);
553 unlock_page(page); 753 unlock_page(page);
@@ -555,5 +755,5 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
555} 755}
556 756
557struct address_space_operations isofs_symlink_aops = { 757struct address_space_operations isofs_symlink_aops = {
558 .readpage = rock_ridge_symlink_readpage 758 .readpage = rock_ridge_symlink_readpage
559}; 759};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 04:16:16 -0500