summaryrefslogtreecommitdiff
path: root/fs/ufs/util.h
blob: 6a0b48cf9cef8dab07ccba43bfbe35d19c4b87ec (plain)
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
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
/*
 *  linux/fs/ufs/util.h
 *
 * Copyright (C) 1998 
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 */

#include <linux/buffer_head.h>
#include <linux/fs.h>
#include "swab.h"


/*
 * some useful macros
 */
#define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))

/*
 * functions used for retyping
 */
static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
{
	return &cpi->c_ubh;
}
static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
{
	return &spi->s_ubh;
}



/*
 * macros used for accessing structures
 */
static inline s32
ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
		 struct ufs_super_block_third *usb3)
{
	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUN:
		return fs32_to_cpu(sb, usb3->fs_u2.fs_sun.fs_state);
	case UFS_ST_SUNx86:
		return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
	case UFS_ST_44BSD:
	default:
		return fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_state);
	}
}

static inline void
ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
		 struct ufs_super_block_third *usb3, s32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUN:
		usb3->fs_u2.fs_sun.fs_state = cpu_to_fs32(sb, value);
		break;
	case UFS_ST_SUNx86:
		usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
		break;
	case UFS_ST_44BSD:
		usb3->fs_u2.fs_44.fs_state = cpu_to_fs32(sb, value);
		break;
	}
}

static inline u32
ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
		  struct ufs_super_block_third *usb3)
{
	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		return fs32_to_cpu(sb, usb3->fs_u2.fs_sunx86.fs_npsect);
	else
		return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
}

static inline u64
ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
	__fs64 tmp;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUN:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
		break;
	case UFS_ST_SUNx86:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
		break;
	case UFS_ST_44BSD:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
		break;
	}

	return fs64_to_cpu(sb, tmp);
}

static inline u64
ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
{
	__fs64 tmp;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUN:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
		break;
	case UFS_ST_SUNx86:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
		break;
	case UFS_ST_44BSD:
		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
		break;
	}

	return fs64_to_cpu(sb, tmp);
}

static inline u16
ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
		return fs16_to_cpu(sb, de->d_u.d_namlen);
	else
		return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
}

static inline void
ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
		de->d_u.d_namlen = cpu_to_fs16(sb, value);
	else
		de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
}

static inline void
ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
{
	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
		return;

	/*
	 * TODO turn this into a table lookup
	 */
	switch (mode & S_IFMT) {
	case S_IFSOCK:
		de->d_u.d_44.d_type = DT_SOCK;
		break;
	case S_IFLNK:
		de->d_u.d_44.d_type = DT_LNK;
		break;
	case S_IFREG:
		de->d_u.d_44.d_type = DT_REG;
		break;
	case S_IFBLK:
		de->d_u.d_44.d_type = DT_BLK;
		break;
	case S_IFDIR:
		de->d_u.d_44.d_type = DT_DIR;
		break;
	case S_IFCHR:
		de->d_u.d_44.d_type = DT_CHR;
		break;
	case S_IFIFO:
		de->d_u.d_44.d_type = DT_FIFO;
		break;
	default:
		de->d_u.d_44.d_type = DT_UNKNOWN;
	}
}

static inline u32
ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_EFT:
		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
	case UFS_UID_44BSD:
		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
	default:
		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
	}
}

static inline void
ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_EFT:
		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
		break;
	case UFS_UID_44BSD:
		inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
		break;
	}
	inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value); 
}

static inline u32
ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_EFT:
		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
	case UFS_UID_44BSD:
		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
	default:
		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
	}
}

static inline void
ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
{
	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
	case UFS_UID_EFT:
		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
		break;
	case UFS_UID_44BSD:
		inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
		break;
	}
	inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
}

extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);

/*
 * These functions manipulate ufs buffers
 */
#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)  
extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
extern void ubh_brelse (struct ufs_buffer_head *);
extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
extern void ubh_bforget (struct ufs_buffer_head *);
extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);



/*
 * macros and inline function to get important structures from ufs_sb_private_info
 */

static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
				   unsigned int offset)
{
	unsigned int index;
	
	index = offset >> uspi->s_fshift;
	offset &= ~uspi->s_fmask;
	return uspi->s_ubh.bh[index]->b_data + offset;
}

#define ubh_get_usb_first(uspi) \
	((struct ufs_super_block_first *)get_usb_offset((uspi), 0))

#define ubh_get_usb_second(uspi) \
	((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))

#define ubh_get_usb_third(uspi)	\
	((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))


#define ubh_get_ucg(ubh) \
	((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))


/*
 * Extract byte from ufs_buffer_head
 * Extract the bits for a block from a map inside ufs_buffer_head
 */
#define ubh_get_addr8(ubh,begin) \
	((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
	((begin) & ~uspi->s_fmask))

#define ubh_get_addr16(ubh,begin) \
	(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
	((begin) & (uspi->fsize>>1) - 1)))

#define ubh_get_addr32(ubh,begin) \
	(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
	((begin) & ((uspi->s_fsize>>2) - 1)))

#define ubh_get_addr ubh_get_addr8

#define ubh_blkmap(ubh,begin,bit) \
	((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))


/*
 * Macros for access to superblock array structures
 */
#define ubh_postbl(ubh,cylno,i) \
	((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
	? (*(__s16*)(ubh_get_addr(ubh, \
	(unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
	+ (((cylno) * 16 + (i)) << 1) ) )) \
	: (*(__s16*)(ubh_get_addr(ubh, \
	uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))

#define ubh_rotbl(ubh,i) \
	((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
	? (*(__u8*)(ubh_get_addr(ubh, \
	(unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
	: (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))

/*
 * Determine the number of available frags given a
 * percentage to hold in reserve.
 */
#define ufs_freespace(usb, percentreserved) \
	(ufs_blkstofrags(fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nbfree)) + \
	fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))

/*
 * Macros to access cylinder group array structures
 */
#define ubh_cg_blktot(ucpi,cylno) \
	(*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))

#define ubh_cg_blks(ucpi,cylno,rpos) \
	(*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
	(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))

/*
 * Bitmap operations
 * These functions work like classical bitmap operations.
 * The difference is that we don't have the whole bitmap
 * in one contiguous chunk of memory, but in several buffers.
 * The parameters of each function are super_block, ufs_buffer_head and
 * position of the beginning of the bitmap.
 */
#define ubh_setbit(ubh,begin,bit) \
	(*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))

#define ubh_clrbit(ubh,begin,bit) \
	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))

#define ubh_isset(ubh,begin,bit) \
	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))

#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))

#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)

#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
static inline unsigned _ubh_find_next_zero_bit_(
	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
	unsigned begin, unsigned size, unsigned offset)
{
	unsigned base, count, pos;

	size -= offset;
	begin <<= 3;
	offset += begin;
	base = offset >> uspi->s_bpfshift;
	offset &= uspi->s_bpfmask;
	for (;;) {
		count = min_t(unsigned int, size + offset, uspi->s_bpf);
		size -= count - offset;
		pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
		if (pos < count || !size)
			break;
		base++;
		offset = 0;
	}
	return (base << uspi->s_bpfshift) + pos - begin;
} 	

static inline unsigned find_last_zero_bit (unsigned char * bitmap,
	unsigned size, unsigned offset)
{
	unsigned bit, i;
	unsigned char * mapp;
	unsigned char map;

	mapp = bitmap + (size >> 3);
	map = *mapp--;
	bit = 1 << (size & 7);
	for (i = size; i > offset; i--) {
		if ((map & bit) == 0)
			break;
		if ((i & 7) != 0) {
			bit >>= 1;
		} else {
			map = *mapp--;
			bit = 1 << 7;
		}
	}
	return i;
}

#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
static inline unsigned _ubh_find_last_zero_bit_(
	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
	unsigned begin, unsigned start, unsigned end)
{
	unsigned base, count, pos, size;

	size = start - end;
	begin <<= 3;
	start += begin;
	base = start >> uspi->s_bpfshift;
	start &= uspi->s_bpfmask;
	for (;;) {
		count = min_t(unsigned int,
			    size + (uspi->s_bpf - start), uspi->s_bpf)
			- (uspi->s_bpf - start);
		size -= count;
		pos = find_last_zero_bit (ubh->bh[base]->b_data,
			start, start - count);
		if (pos > start - count || !size)
			break;
		base--;
		start = uspi->s_bpf;
	}
	return (base << uspi->s_bpfshift) + pos - begin;
} 	

#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))

#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
	switch (uspi->s_fpb) {
	case 8:
	    	return (*ubh_get_addr (ubh, begin + block) == 0xff);
	case 4:
		return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
	case 2:
		return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
	case 1:
		return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
	}
	return 0;	
}

#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
	switch (uspi->s_fpb) {
	case 8:
	    	*ubh_get_addr (ubh, begin + block) = 0x00;
	    	return; 
	case 4:
		*ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
		return;
	case 2:
		*ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
		return;
	case 1:
		*ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
		return;
	}
}

#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
{
	switch (uspi->s_fpb) {
	case 8:
	    	*ubh_get_addr(ubh, begin + block) = 0xff;
	    	return;
	case 4:
		*ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
		return;
	case 2:
		*ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
		return;
	case 1:
		*ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
		return;
	}
}

static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
	__fs32 * fraglist, int cnt)
{
	struct ufs_sb_private_info * uspi;
	unsigned fragsize, pos;
	
	uspi = UFS_SB(sb)->s_uspi;
	
	fragsize = 0;
	for (pos = 0; pos < uspi->s_fpb; pos++) {
		if (blockmap & (1 << pos)) {
			fragsize++;
		}
		else if (fragsize > 0) {
			fs32_add(sb, &fraglist[fragsize], cnt);
			fragsize = 0;
		}
	}
	if (fragsize > 0 && fragsize < uspi->s_fpb)
		fs32_add(sb, &fraglist[fragsize], cnt);
}

#define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 
	unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
{
	unsigned rest, offset;
	unsigned char * cp;
	

	offset = begin & ~uspi->s_fmask;
	begin >>= uspi->s_fshift;
	for (;;) {
		if ((offset + size) < uspi->s_fsize)
			rest = size;
		else
			rest = uspi->s_fsize - offset;
		size -= rest;
		cp = ubh->bh[begin]->b_data + offset;
		while ((table[*cp++] & mask) == 0 && --rest);
		if (rest || !size)
			break;
		begin++;
		offset = 0;
	}
	return (size + rest);
}