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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ufs/util.h
3 *
4 * Copyright (C) 1998
5 * Daniel Pirkl <daniel.pirkl@email.cz>
6 * Charles University, Faculty of Mathematics and Physics
7 */
8
9#include <linux/buffer_head.h>
10#include <linux/fs.h>
11#include "swab.h"
12
13
14/*
15 * some useful macros
16 */
17#define in_range(b,first,len) ((b)>=(first)&&(b)<(first)+(len))
18
19/*
20 * macros used for retyping
21 */
22#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
23#define USPI_UBH ((struct ufs_buffer_head *)uspi)
24
25
26
27/*
28 * macros used for accessing structures
29 */
30static inline s32
31ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
32 struct ufs_super_block_third *usb3)
33{
34 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
35 case UFS_ST_SUN:
36 return fs32_to_cpu(sb, usb3->fs_u2.fs_sun.fs_state);
37 case UFS_ST_SUNx86:
38 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
39 case UFS_ST_44BSD:
40 default:
41 return fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_state);
42 }
43}
44
45static inline void
46ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
47 struct ufs_super_block_third *usb3, s32 value)
48{
49 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
50 case UFS_ST_SUN:
51 usb3->fs_u2.fs_sun.fs_state = cpu_to_fs32(sb, value);
52 break;
53 case UFS_ST_SUNx86:
54 usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
55 break;
56 case UFS_ST_44BSD:
57 usb3->fs_u2.fs_44.fs_state = cpu_to_fs32(sb, value);
58 break;
59 }
60}
61
62static inline u32
63ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
64 struct ufs_super_block_third *usb3)
65{
66 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
67 return fs32_to_cpu(sb, usb3->fs_u2.fs_sunx86.fs_npsect);
68 else
69 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
70}
71
72static inline u64
73ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
74{
75 __fs64 tmp;
76
77 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
78 case UFS_ST_SUN:
79 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
80 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
81 break;
82 case UFS_ST_SUNx86:
83 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
84 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
85 break;
86 case UFS_ST_44BSD:
87 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
88 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
89 break;
90 }
91
92 return fs64_to_cpu(sb, tmp);
93}
94
95static inline u64
96ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
97{
98 __fs64 tmp;
99
100 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
101 case UFS_ST_SUN:
102 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
103 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
104 break;
105 case UFS_ST_SUNx86:
106 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
107 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
108 break;
109 case UFS_ST_44BSD:
110 ((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
111 ((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
112 break;
113 }
114
115 return fs64_to_cpu(sb, tmp);
116}
117
118static inline u16
119ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
120{
121 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
122 return fs16_to_cpu(sb, de->d_u.d_namlen);
123 else
124 return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
125}
126
127static inline void
128ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
129{
130 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
131 de->d_u.d_namlen = cpu_to_fs16(sb, value);
132 else
133 de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
134}
135
136static inline void
137ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
138{
139 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
140 return;
141
142 /*
143 * TODO turn this into a table lookup
144 */
145 switch (mode & S_IFMT) {
146 case S_IFSOCK:
147 de->d_u.d_44.d_type = DT_SOCK;
148 break;
149 case S_IFLNK:
150 de->d_u.d_44.d_type = DT_LNK;
151 break;
152 case S_IFREG:
153 de->d_u.d_44.d_type = DT_REG;
154 break;
155 case S_IFBLK:
156 de->d_u.d_44.d_type = DT_BLK;
157 break;
158 case S_IFDIR:
159 de->d_u.d_44.d_type = DT_DIR;
160 break;
161 case S_IFCHR:
162 de->d_u.d_44.d_type = DT_CHR;
163 break;
164 case S_IFIFO:
165 de->d_u.d_44.d_type = DT_FIFO;
166 break;
167 default:
168 de->d_u.d_44.d_type = DT_UNKNOWN;
169 }
170}
171
172static inline u32
173ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
174{
175 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
176 case UFS_UID_EFT:
177 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
178 case UFS_UID_44BSD:
179 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
180 default:
181 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
182 }
183}
184
185static inline void
186ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
187{
188 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
189 case UFS_UID_EFT:
190 inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
191 break;
192 case UFS_UID_44BSD:
193 inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
194 break;
195 }
196 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
197}
198
199static inline u32
200ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
201{
202 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
203 case UFS_UID_EFT:
204 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
205 case UFS_UID_44BSD:
206 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
207 default:
208 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
209 }
210}
211
212static inline void
213ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
214{
215 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
216 case UFS_UID_EFT:
217 inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
218 break;
219 case UFS_UID_44BSD:
220 inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
221 break;
222 }
223 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
224}
225
226extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
227extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
228
229/*
230 * These functions manipulate ufs buffers
231 */
232#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
233extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
234extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
235extern void ubh_brelse (struct ufs_buffer_head *);
236extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
237extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
238extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
239extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
240extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
241extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
242extern void ubh_bforget (struct ufs_buffer_head *);
243extern int ubh_buffer_dirty (struct ufs_buffer_head *);
244#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
245extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
246#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
247extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
248
249
250
251/*
252 * macros to get important structures from ufs_buffer_head
253 */
254#define ubh_get_usb_first(ubh) \
255 ((struct ufs_super_block_first *)((ubh)->bh[0]->b_data))
256
257#define ubh_get_usb_second(ubh) \
258 ((struct ufs_super_block_second *)(ubh)-> \
259 bh[UFS_SECTOR_SIZE >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE & ~uspi->s_fmask))
260
261#define ubh_get_usb_third(ubh) \
262 ((struct ufs_super_block_third *)((ubh)-> \
263 bh[UFS_SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE*2 & ~uspi->s_fmask)))
264
265#define ubh_get_ucg(ubh) \
266 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
267
268
269/*
270 * Extract byte from ufs_buffer_head
271 * Extract the bits for a block from a map inside ufs_buffer_head
272 */
273#define ubh_get_addr8(ubh,begin) \
274 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
275 ((begin) & ~uspi->s_fmask))
276
277#define ubh_get_addr16(ubh,begin) \
278 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
279 ((begin) & (uspi->fsize>>1) - 1)))
280
281#define ubh_get_addr32(ubh,begin) \
282 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
283 ((begin) & ((uspi->s_fsize>>2) - 1)))
284
285#define ubh_get_addr ubh_get_addr8
286
287#define ubh_blkmap(ubh,begin,bit) \
288 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
289
290
291/*
292 * Macros for access to superblock array structures
293 */
294#define ubh_postbl(ubh,cylno,i) \
295 ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
296 ? (*(__s16*)(ubh_get_addr(ubh, \
297 (unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
298 + (((cylno) * 16 + (i)) << 1) ) )) \
299 : (*(__s16*)(ubh_get_addr(ubh, \
300 uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
301
302#define ubh_rotbl(ubh,i) \
303 ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
304 ? (*(__u8*)(ubh_get_addr(ubh, \
305 (unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
306 : (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
307
308/*
309 * Determine the number of available frags given a
310 * percentage to hold in reserve.
311 */
312#define ufs_freespace(usb, percentreserved) \
313 (ufs_blkstofrags(fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nbfree)) + \
314 fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
315
316/*
317 * Macros to access cylinder group array structures
318 */
319#define ubh_cg_blktot(ucpi,cylno) \
320 (*((__fs32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
321
322#define ubh_cg_blks(ucpi,cylno,rpos) \
323 (*((__fs16*)ubh_get_addr(UCPI_UBH, \
324 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
325
326/*
327 * Bitmap operations
328 * These functions work like classical bitmap operations.
329 * The difference is that we don't have the whole bitmap
330 * in one contiguous chunk of memory, but in several buffers.
331 * The parameters of each function are super_block, ufs_buffer_head and
332 * position of the beginning of the bitmap.
333 */
334#define ubh_setbit(ubh,begin,bit) \
335 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
336
337#define ubh_clrbit(ubh,begin,bit) \
338 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
339
340#define ubh_isset(ubh,begin,bit) \
341 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
342
343#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
344
345#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
346
347#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
348static inline unsigned _ubh_find_next_zero_bit_(
349 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
350 unsigned begin, unsigned size, unsigned offset)
351{
352 unsigned base, count, pos;
353
354 size -= offset;
355 begin <<= 3;
356 offset += begin;
357 base = offset >> uspi->s_bpfshift;
358 offset &= uspi->s_bpfmask;
359 for (;;) {
360 count = min_t(unsigned int, size + offset, uspi->s_bpf);
361 size -= count - offset;
362 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
363 if (pos < count || !size)
364 break;
365 base++;
366 offset = 0;
367 }
368 return (base << uspi->s_bpfshift) + pos - begin;
369}
370
371static inline unsigned find_last_zero_bit (unsigned char * bitmap,
372 unsigned size, unsigned offset)
373{
374 unsigned bit, i;
375 unsigned char * mapp;
376 unsigned char map;
377
378 mapp = bitmap + (size >> 3);
379 map = *mapp--;
380 bit = 1 << (size & 7);
381 for (i = size; i > offset; i--) {
382 if ((map & bit) == 0)
383 break;
384 if ((i & 7) != 0) {
385 bit >>= 1;
386 } else {
387 map = *mapp--;
388 bit = 1 << 7;
389 }
390 }
391 return i;
392}
393
394#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
395static inline unsigned _ubh_find_last_zero_bit_(
396 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
397 unsigned begin, unsigned start, unsigned end)
398{
399 unsigned base, count, pos, size;
400
401 size = start - end;
402 begin <<= 3;
403 start += begin;
404 base = start >> uspi->s_bpfshift;
405 start &= uspi->s_bpfmask;
406 for (;;) {
407 count = min_t(unsigned int,
408 size + (uspi->s_bpf - start), uspi->s_bpf)
409 - (uspi->s_bpf - start);
410 size -= count;
411 pos = find_last_zero_bit (ubh->bh[base]->b_data,
412 start, start - count);
413 if (pos > start - count || !size)
414 break;
415 base--;
416 start = uspi->s_bpf;
417 }
418 return (base << uspi->s_bpfshift) + pos - begin;
419}
420
421#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
422
423#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
424static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
425 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
426{
427 switch (uspi->s_fpb) {
428 case 8:
429 return (*ubh_get_addr (ubh, begin + block) == 0xff);
430 case 4:
431 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
432 case 2:
433 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
434 case 1:
435 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
436 }
437 return 0;
438}
439
440#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
441static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
442 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
443{
444 switch (uspi->s_fpb) {
445 case 8:
446 *ubh_get_addr (ubh, begin + block) = 0x00;
447 return;
448 case 4:
449 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
450 return;
451 case 2:
452 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
453 return;
454 case 1:
455 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
456 return;
457 }
458}
459
460#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
461static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
462 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
463{
464 switch (uspi->s_fpb) {
465 case 8:
466 *ubh_get_addr(ubh, begin + block) = 0xff;
467 return;
468 case 4:
469 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
470 return;
471 case 2:
472 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
473 return;
474 case 1:
475 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
476 return;
477 }
478}
479
480static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
481 __fs32 * fraglist, int cnt)
482{
483 struct ufs_sb_private_info * uspi;
484 unsigned fragsize, pos;
485
486 uspi = UFS_SB(sb)->s_uspi;
487
488 fragsize = 0;
489 for (pos = 0; pos < uspi->s_fpb; pos++) {
490 if (blockmap & (1 << pos)) {
491 fragsize++;
492 }
493 else if (fragsize > 0) {
494 fs32_add(sb, &fraglist[fragsize], cnt);
495 fragsize = 0;
496 }
497 }
498 if (fragsize > 0 && fragsize < uspi->s_fpb)
499 fs32_add(sb, &fraglist[fragsize], cnt);
500}
501
502#define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
503static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
504 unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
505{
506 unsigned rest, offset;
507 unsigned char * cp;
508
509
510 offset = begin & ~uspi->s_fmask;
511 begin >>= uspi->s_fshift;
512 for (;;) {
513 if ((offset + size) < uspi->s_fsize)
514 rest = size;
515 else
516 rest = uspi->s_fsize - offset;
517 size -= rest;
518 cp = ubh->bh[begin]->b_data + offset;
519 while ((table[*cp++] & mask) == 0 && --rest);
520 if (rest || !size)
521 break;
522 begin++;
523 offset = 0;
524 }
525 return (size + rest);
526}