6b13f685e
 김민수
BSP 최초 추가
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
|
/*
* linux/fs/hpfs/anode.c
*
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
*
* handling HPFS anode tree that contains file allocation info
*/
#include "hpfs_fn.h"
/* Find a sector in allocation tree */
secno hpfs_bplus_lookup(struct super_block *s, struct inode *inode,
struct bplus_header *btree, unsigned sec,
struct buffer_head *bh)
{
anode_secno a = -1;
struct anode *anode;
int i;
int c1, c2 = 0;
go_down:
if (hpfs_sb(s)->sb_chk) if (hpfs_stop_cycles(s, a, &c1, &c2, "hpfs_bplus_lookup")) return -1;
if (bp_internal(btree)) {
for (i = 0; i < btree->n_used_nodes; i++)
if (le32_to_cpu(btree->u.internal[i].file_secno) > sec) {
a = le32_to_cpu(btree->u.internal[i].down);
brelse(bh);
if (!(anode = hpfs_map_anode(s, a, &bh))) return -1;
btree = &anode->btree;
goto go_down;
}
hpfs_error(s, "sector %08x not found in internal anode %08x", sec, a);
brelse(bh);
return -1;
}
for (i = 0; i < btree->n_used_nodes; i++)
if (le32_to_cpu(btree->u.external[i].file_secno) <= sec &&
le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) > sec) {
a = le32_to_cpu(btree->u.external[i].disk_secno) + sec - le32_to_cpu(btree->u.external[i].file_secno);
if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, a, 1, "data")) {
brelse(bh);
return -1;
}
if (inode) {
struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
hpfs_inode->i_file_sec = le32_to_cpu(btree->u.external[i].file_secno);
hpfs_inode->i_disk_sec = le32_to_cpu(btree->u.external[i].disk_secno);
hpfs_inode->i_n_secs = le32_to_cpu(btree->u.external[i].length);
}
brelse(bh);
return a;
}
hpfs_error(s, "sector %08x not found in external anode %08x", sec, a);
brelse(bh);
return -1;
}
/* Add a sector to tree */
secno hpfs_add_sector_to_btree(struct super_block *s, secno node, int fnod, unsigned fsecno)
{
struct bplus_header *btree;
struct anode *anode = NULL, *ranode = NULL;
struct fnode *fnode;
anode_secno a, na = -1, ra, up = -1;
secno se;
struct buffer_head *bh, *bh1, *bh2;
int n;
unsigned fs;
int c1, c2 = 0;
if (fnod) {
if (!(fnode = hpfs_map_fnode(s, node, &bh))) return -1;
btree = &fnode->btree;
} else {
if (!(anode = hpfs_map_anode(s, node, &bh))) return -1;
btree = &anode->btree;
}
a = node;
go_down:
if ((n = btree->n_used_nodes - 1) < -!!fnod) {
hpfs_error(s, "anode %08x has no entries", a);
brelse(bh);
return -1;
}
if (bp_internal(btree)) {
a = le32_to_cpu(btree->u.internal[n].down);
btree->u.internal[n].file_secno = cpu_to_le32(-1);
mark_buffer_dirty(bh);
brelse(bh);
if (hpfs_sb(s)->sb_chk)
if (hpfs_stop_cycles(s, a, &c1, &c2, "hpfs_add_sector_to_btree #1")) return -1;
if (!(anode = hpfs_map_anode(s, a, &bh))) return -1;
btree = &anode->btree;
goto go_down;
}
if (n >= 0) {
if (le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length) != fsecno) {
hpfs_error(s, "allocated size %08x, trying to add sector %08x, %cnode %08x",
le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length), fsecno,
fnod?'f':'a', node);
brelse(bh);
return -1;
}
if (hpfs_alloc_if_possible(s, se = le32_to_cpu(btree->u.external[n].disk_secno) + le32_to_cpu(btree->u.external[n].length))) {
le32_add_cpu(&btree->u.external[n].length, 1);
mark_buffer_dirty(bh);
brelse(bh);
return se;
}
} else {
if (fsecno) {
hpfs_error(s, "empty file %08x, trying to add sector %08x", node, fsecno);
brelse(bh);
return -1;
}
se = !fnod ? node : (node + 16384) & ~16383;
}
if (!(se = hpfs_alloc_sector(s, se, 1, fsecno*ALLOC_M>ALLOC_FWD_MAX ? ALLOC_FWD_MAX : fsecno*ALLOC_M<ALLOC_FWD_MIN ? ALLOC_FWD_MIN : fsecno*ALLOC_M))) {
brelse(bh);
return -1;
}
fs = n < 0 ? 0 : le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length);
if (!btree->n_free_nodes) {
up = a != node ? le32_to_cpu(anode->up) : -1;
if (!(anode = hpfs_alloc_anode(s, a, &na, &bh1))) {
brelse(bh);
hpfs_free_sectors(s, se, 1);
return -1;
}
if (a == node && fnod) {
anode->up = cpu_to_le32(node);
anode->btree.flags |= BP_fnode_parent;
anode->btree.n_used_nodes = btree->n_used_nodes;
anode->btree.first_free = btree->first_free;
anode->btree.n_free_nodes = 40 - anode->btree.n_used_nodes;
memcpy(&anode->u, &btree->u, btree->n_used_nodes * 12);
btree->flags |= BP_internal;
btree->n_free_nodes = 11;
btree->n_used_nodes = 1;
btree->first_free = cpu_to_le16((char *)&(btree->u.internal[1]) - (char *)btree);
btree->u.internal[0].file_secno = cpu_to_le32(-1);
btree->u.internal[0].down = cpu_to_le32(na);
mark_buffer_dirty(bh);
} else if (!(ranode = hpfs_alloc_anode(s, /*a*/0, &ra, &bh2))) {
brelse(bh);
brelse(bh1);
hpfs_free_sectors(s, se, 1);
hpfs_free_sectors(s, na, 1);
return -1;
}
brelse(bh);
bh = bh1;
btree = &anode->btree;
}
btree->n_free_nodes--; n = btree->n_used_nodes++;
le16_add_cpu(&btree->first_free, 12);
btree->u.external[n].disk_secno = cpu_to_le32(se);
btree->u.external[n].file_secno = cpu_to_le32(fs);
btree->u.external[n].length = cpu_to_le32(1);
mark_buffer_dirty(bh);
brelse(bh);
if ((a == node && fnod) || na == -1) return se;
c2 = 0;
while (up != (anode_secno)-1) {
struct anode *new_anode;
if (hpfs_sb(s)->sb_chk)
if (hpfs_stop_cycles(s, up, &c1, &c2, "hpfs_add_sector_to_btree #2")) return -1;
if (up != node || !fnod) {
if (!(anode = hpfs_map_anode(s, up, &bh))) return -1;
btree = &anode->btree;
} else {
if (!(fnode = hpfs_map_fnode(s, up, &bh))) return -1;
btree = &fnode->btree;
}
if (btree->n_free_nodes) {
btree->n_free_nodes--; n = btree->n_used_nodes++;
le16_add_cpu(&btree->first_free, 8);
btree->u.internal[n].file_secno = cpu_to_le32(-1);
btree->u.internal[n].down = cpu_to_le32(na);
btree->u.internal[n-1].file_secno = cpu_to_le32(fs);
mark_buffer_dirty(bh);
brelse(bh);
brelse(bh2);
hpfs_free_sectors(s, ra, 1);
if ((anode = hpfs_map_anode(s, na, &bh))) {
anode->up = cpu_to_le32(up);
if (up == node && fnod)
anode->btree.flags |= BP_fnode_parent;
else
anode->btree.flags &= ~BP_fnode_parent;
mark_buffer_dirty(bh);
brelse(bh);
}
return se;
}
up = up != node ? le32_to_cpu(anode->up) : -1;
btree->u.internal[btree->n_used_nodes - 1].file_secno = cpu_to_le32(/*fs*/-1);
mark_buffer_dirty(bh);
brelse(bh);
a = na;
if ((new_anode = hpfs_alloc_anode(s, a, &na, &bh))) {
anode = new_anode;
/*anode->up = cpu_to_le32(up != -1 ? up : ra);*/
anode->btree.flags |= BP_internal;
anode->btree.n_used_nodes = 1;
anode->btree.n_free_nodes = 59;
anode->btree.first_free = cpu_to_le16(16);
anode->btree.u.internal[0].down = cpu_to_le32(a);
anode->btree.u.internal[0].file_secno = cpu_to_le32(-1);
mark_buffer_dirty(bh);
brelse(bh);
if ((anode = hpfs_map_anode(s, a, &bh))) {
anode->up = cpu_to_le32(na);
mark_buffer_dirty(bh);
brelse(bh);
}
} else na = a;
}
if ((anode = hpfs_map_anode(s, na, &bh))) {
anode->up = cpu_to_le32(node);
if (fnod)
anode->btree.flags |= BP_fnode_parent;
mark_buffer_dirty(bh);
brelse(bh);
}
if (!fnod) {
if (!(anode = hpfs_map_anode(s, node, &bh))) {
brelse(bh2);
return -1;
}
btree = &anode->btree;
} else {
if (!(fnode = hpfs_map_fnode(s, node, &bh))) {
brelse(bh2);
return -1;
}
btree = &fnode->btree;
}
ranode->up = cpu_to_le32(node);
memcpy(&ranode->btree, btree, le16_to_cpu(btree->first_free));
if (fnod)
ranode->btree.flags |= BP_fnode_parent;
ranode->btree.n_free_nodes = (bp_internal(&ranode->btree) ? 60 : 40) - ranode->btree.n_used_nodes;
if (bp_internal(&ranode->btree)) for (n = 0; n < ranode->btree.n_used_nodes; n++) {
struct anode *unode;
if ((unode = hpfs_map_anode(s, le32_to_cpu(ranode->u.internal[n].down), &bh1))) {
unode->up = cpu_to_le32(ra);
unode->btree.flags &= ~BP_fnode_parent;
mark_buffer_dirty(bh1);
brelse(bh1);
}
}
btree->flags |= BP_internal;
btree->n_free_nodes = fnod ? 10 : 58;
btree->n_used_nodes = 2;
btree->first_free = cpu_to_le16((char *)&btree->u.internal[2] - (char *)btree);
btree->u.internal[0].file_secno = cpu_to_le32(fs);
btree->u.internal[0].down = cpu_to_le32(ra);
btree->u.internal[1].file_secno = cpu_to_le32(-1);
btree->u.internal[1].down = cpu_to_le32(na);
mark_buffer_dirty(bh);
brelse(bh);
mark_buffer_dirty(bh2);
brelse(bh2);
return se;
}
/*
* Remove allocation tree. Recursion would look much nicer but
* I want to avoid it because it can cause stack overflow.
*/
void hpfs_remove_btree(struct super_block *s, struct bplus_header *btree)
{
struct bplus_header *btree1 = btree;
struct anode *anode = NULL;
anode_secno ano = 0, oano;
struct buffer_head *bh;
int level = 0;
int pos = 0;
int i;
int c1, c2 = 0;
int d1, d2;
go_down:
d2 = 0;
while (bp_internal(btree1)) {
ano = le32_to_cpu(btree1->u.internal[pos].down);
if (level) brelse(bh);
if (hpfs_sb(s)->sb_chk)
if (hpfs_stop_cycles(s, ano, &d1, &d2, "hpfs_remove_btree #1"))
return;
if (!(anode = hpfs_map_anode(s, ano, &bh))) return;
btree1 = &anode->btree;
level++;
pos = 0;
}
for (i = 0; i < btree1->n_used_nodes; i++)
hpfs_free_sectors(s, le32_to_cpu(btree1->u.external[i].disk_secno), le32_to_cpu(btree1->u.external[i].length));
go_up:
if (!level) return;
brelse(bh);
if (hpfs_sb(s)->sb_chk)
if (hpfs_stop_cycles(s, ano, &c1, &c2, "hpfs_remove_btree #2")) return;
hpfs_free_sectors(s, ano, 1);
oano = ano;
ano = le32_to_cpu(anode->up);
if (--level) {
if (!(anode = hpfs_map_anode(s, ano, &bh))) return;
btree1 = &anode->btree;
} else btree1 = btree;
for (i = 0; i < btree1->n_used_nodes; i++) {
if (le32_to_cpu(btree1->u.internal[i].down) == oano) {
if ((pos = i + 1) < btree1->n_used_nodes)
goto go_down;
else
goto go_up;
}
}
hpfs_error(s,
"reference to anode %08x not found in anode %08x "
"(probably bad up pointer)",
oano, level ? ano : -1);
if (level)
brelse(bh);
}
/* Just a wrapper around hpfs_bplus_lookup .. used for reading eas */
static secno anode_lookup(struct super_block *s, anode_secno a, unsigned sec)
{
struct anode *anode;
struct buffer_head *bh;
if (!(anode = hpfs_map_anode(s, a, &bh))) return -1;
return hpfs_bplus_lookup(s, NULL, &anode->btree, sec, bh);
}
int hpfs_ea_read(struct super_block *s, secno a, int ano, unsigned pos,
unsigned len, char *buf)
{
struct buffer_head *bh;
char *data;
secno sec;
unsigned l;
while (len) {
if (ano) {
if ((sec = anode_lookup(s, a, pos >> 9)) == -1)
return -1;
} else sec = a + (pos >> 9);
if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, sec, 1, "ea #1")) return -1;
if (!(data = hpfs_map_sector(s, sec, &bh, (len - 1) >> 9)))
return -1;
l = 0x200 - (pos & 0x1ff); if (l > len) l = len;
memcpy(buf, data + (pos & 0x1ff), l);
brelse(bh);
buf += l; pos += l; len -= l;
}
return 0;
}
int hpfs_ea_write(struct super_block *s, secno a, int ano, unsigned pos,
unsigned len, const char *buf)
{
struct buffer_head *bh;
char *data;
secno sec;
unsigned l;
while (len) {
if (ano) {
if ((sec = anode_lookup(s, a, pos >> 9)) == -1)
return -1;
} else sec = a + (pos >> 9);
if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, sec, 1, "ea #2")) return -1;
if (!(data = hpfs_map_sector(s, sec, &bh, (len - 1) >> 9)))
return -1;
l = 0x200 - (pos & 0x1ff); if (l > len) l = len;
memcpy(data + (pos & 0x1ff), buf, l);
mark_buffer_dirty(bh);
brelse(bh);
buf += l; pos += l; len -= l;
}
return 0;
}
void hpfs_ea_remove(struct super_block *s, secno a, int ano, unsigned len)
{
struct anode *anode;
struct buffer_head *bh;
if (ano) {
if (!(anode = hpfs_map_anode(s, a, &bh))) return;
hpfs_remove_btree(s, &anode->btree);
brelse(bh);
hpfs_free_sectors(s, a, 1);
} else hpfs_free_sectors(s, a, (len + 511) >> 9);
}
/* Truncate allocation tree. Doesn't join anodes - I hope it doesn't matter */
void hpfs_truncate_btree(struct super_block *s, secno f, int fno, unsigned secs)
{
struct fnode *fnode;
struct anode *anode;
struct buffer_head *bh;
struct bplus_header *btree;
anode_secno node = f;
int i, j, nodes;
int c1, c2 = 0;
if (fno) {
if (!(fnode = hpfs_map_fnode(s, f, &bh))) return;
btree = &fnode->btree;
} else {
if (!(anode = hpfs_map_anode(s, f, &bh))) return;
btree = &anode->btree;
}
if (!secs) {
hpfs_remove_btree(s, btree);
if (fno) {
btree->n_free_nodes = 8;
btree->n_used_nodes = 0;
btree->first_free = cpu_to_le16(8);
btree->flags &= ~BP_internal;
mark_buffer_dirty(bh);
} else hpfs_free_sectors(s, f, 1);
brelse(bh);
return;
}
while (bp_internal(btree)) {
nodes = btree->n_used_nodes + btree->n_free_nodes;
for (i = 0; i < btree->n_used_nodes; i++)
if (le32_to_cpu(btree->u.internal[i].file_secno) >= secs) goto f;
brelse(bh);
hpfs_error(s, "internal btree %08x doesn't end with -1", node);
return;
f:
for (j = i + 1; j < btree->n_used_nodes; j++)
hpfs_ea_remove(s, le32_to_cpu(btree->u.internal[j].down), 1, 0);
btree->n_used_nodes = i + 1;
btree->n_free_nodes = nodes - btree->n_used_nodes;
btree->first_free = cpu_to_le16(8 + 8 * btree->n_used_nodes);
mark_buffer_dirty(bh);
if (btree->u.internal[i].file_secno == cpu_to_le32(secs)) {
brelse(bh);
return;
}
node = le32_to_cpu(btree->u.internal[i].down);
brelse(bh);
if (hpfs_sb(s)->sb_chk)
if (hpfs_stop_cycles(s, node, &c1, &c2, "hpfs_truncate_btree"))
return;
if (!(anode = hpfs_map_anode(s, node, &bh))) return;
btree = &anode->btree;
}
nodes = btree->n_used_nodes + btree->n_free_nodes;
for (i = 0; i < btree->n_used_nodes; i++)
if (le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) >= secs) goto ff;
brelse(bh);
return;
ff:
if (secs <= le32_to_cpu(btree->u.external[i].file_secno)) {
hpfs_error(s, "there is an allocation error in file %08x, sector %08x", f, secs);
if (i) i--;
}
else if (le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) > secs) {
hpfs_free_sectors(s, le32_to_cpu(btree->u.external[i].disk_secno) + secs -
le32_to_cpu(btree->u.external[i].file_secno), le32_to_cpu(btree->u.external[i].length)
- secs + le32_to_cpu(btree->u.external[i].file_secno)); /* I hope gcc optimizes this :-) */
btree->u.external[i].length = cpu_to_le32(secs - le32_to_cpu(btree->u.external[i].file_secno));
}
for (j = i + 1; j < btree->n_used_nodes; j++)
hpfs_free_sectors(s, le32_to_cpu(btree->u.external[j].disk_secno), le32_to_cpu(btree->u.external[j].length));
btree->n_used_nodes = i + 1;
btree->n_free_nodes = nodes - btree->n_used_nodes;
btree->first_free = cpu_to_le16(8 + 12 * btree->n_used_nodes);
mark_buffer_dirty(bh);
brelse(bh);
}
/* Remove file or directory and it's eas - note that directory must
be empty when this is called. */
void hpfs_remove_fnode(struct super_block *s, fnode_secno fno)
{
struct buffer_head *bh;
struct fnode *fnode;
struct extended_attribute *ea;
struct extended_attribute *ea_end;
if (!(fnode = hpfs_map_fnode(s, fno, &bh))) return;
if (!fnode_is_dir(fnode)) hpfs_remove_btree(s, &fnode->btree);
else hpfs_remove_dtree(s, le32_to_cpu(fnode->u.external[0].disk_secno));
ea_end = fnode_end_ea(fnode);
for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
if (ea_indirect(ea))
hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea));
hpfs_ea_ext_remove(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l));
brelse(bh);
hpfs_free_sectors(s, fno, 1);
}
|