1 /*
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/fs.h>
10 #include "swab.h"
11
12
13 /*
14 * some useful macros
15 */
16 #define in_range(b,first,len) ((b)>=(first)&&(b)<(first)+(len))
17 #define min(x,y) ((x)<(y)?(x):(y))
18 #define max(x,y) ((x)>(y)?(x):(y))
19
20
21
22 /*
23 * macros used for retyping
24 */
25 #define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
26 #define USPI_UBH ((struct ufs_buffer_head *)uspi)
27
28
29
30 /*
31 * macros used for accesing structures
32 */
33 #define ufs_get_fs_state(usb1,usb3) _ufs_get_fs_state_(usb1,usb3,flags,swab)
34 static inline __s32 _ufs_get_fs_state_(struct ufs_super_block_first * usb1,
35 struct ufs_super_block_third * usb3, unsigned flags, unsigned swab)
36 {
37 switch (flags & UFS_ST_MASK) {
38 case UFS_ST_SUN:
39 return SWAB32((usb3)->fs_u2.fs_sun.fs_state);
40 case UFS_ST_SUNx86:
41 return SWAB32((usb1)->fs_u1.fs_sunx86.fs_state);
42 case UFS_ST_44BSD:
43 default:
44 return SWAB32((usb3)->fs_u2.fs_44.fs_state);
45 }
46 }
47
48 #define ufs_set_fs_state(usb1,usb3,value) _ufs_set_fs_state_(usb1,usb3,value,flags,swab)
49 static inline void _ufs_set_fs_state_(struct ufs_super_block_first * usb1,
50 struct ufs_super_block_third * usb3, __s32 value, unsigned flags, unsigned swab)
51 {
52 switch (flags & UFS_ST_MASK) {
53 case UFS_ST_SUN:
54 (usb3)->fs_u2.fs_sun.fs_state = SWAB32(value);
55 break;
56 case UFS_ST_SUNx86:
57 (usb1)->fs_u1.fs_sunx86.fs_state = SWAB32(value);
58 break;
59 case UFS_ST_44BSD:
60 (usb3)->fs_u2.fs_44.fs_state = SWAB32(value);
61 break;
62 }
63 }
64
65 #define ufs_get_fs_npsect(usb1,usb3) _ufs_get_fs_npsect_(usb1,usb3,flags,swab)
66 static inline __u32 _ufs_get_fs_npsect_(struct ufs_super_block_first * usb1,
67 struct ufs_super_block_third * usb3, unsigned flags, unsigned swab)
68 {
69 if ((flags & UFS_ST_MASK) == UFS_ST_SUNx86)
70 return SWAB32((usb3)->fs_u2.fs_sunx86.fs_npsect);
71 else
72 return SWAB32((usb1)->fs_u1.fs_sun.fs_npsect);
73 }
74
75 #define ufs_get_fs_qbmask(usb3) _ufs_get_fs_qbmask_(usb3,flags,swab)
76 static inline __u64 _ufs_get_fs_qbmask_(struct ufs_super_block_third * usb3,
77 unsigned flags, unsigned swab)
78 {
79 __u64 tmp;
80 switch (flags & UFS_ST_MASK) {
81 case UFS_ST_SUN:
82 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
83 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
84 break;
85 case UFS_ST_SUNx86:
86 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
87 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
88 break;
89 case UFS_ST_44BSD:
90 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
91 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
92 break;
93 }
94 return SWAB64(tmp);
95 }
96
97 #define ufs_get_fs_qfmask(usb3) _ufs_get_fs_qfmask_(usb3,flags,swab)
98 static inline __u64 _ufs_get_fs_qfmask_(struct ufs_super_block_third * usb3,
99 unsigned flags, unsigned swab)
100 {
101 __u64 tmp;
102 switch (flags & UFS_ST_MASK) {
103 case UFS_ST_SUN:
104 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
105 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
106 break;
107 case UFS_ST_SUNx86:
108 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
109 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
110 break;
111 case UFS_ST_44BSD:
112 ((u32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
113 ((u32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
114 break;
115 }
116 return SWAB64(tmp);
117 }
118
119 #define ufs_get_de_namlen(de) \
120 (((flags & UFS_DE_MASK) == UFS_DE_OLD) \
121 ? SWAB16(de->d_u.d_namlen) \
122 : de->d_u.d_44.d_namlen)
123
124 #define ufs_set_de_namlen(de,value) \
125 (((flags & UFS_DE_MASK) == UFS_DE_OLD) \
126 ? (de->d_u.d_namlen = SWAB16(value)) \
127 : (de->d_u.d_44.d_namlen = value))
128
129 #define ufs_set_de_type(de,mode) _ufs_set_de_type_(de,mode,flags,swab)
130 static inline void _ufs_set_de_type_(struct ufs_dir_entry * de, int mode,
131 unsigned flags, unsigned swab)
132 {
133 if ((flags & UFS_DE_MASK) == UFS_DE_44BSD) {
134 switch (mode & S_IFMT) {
135 case S_IFSOCK: de->d_u.d_44.d_type = DT_SOCK; break;
136 case S_IFLNK: de->d_u.d_44.d_type = DT_LNK; break;
137 case S_IFREG: de->d_u.d_44.d_type = DT_REG; break;
138 case S_IFBLK: de->d_u.d_44.d_type = DT_BLK; break;
139 case S_IFDIR: de->d_u.d_44.d_type = DT_DIR; break;
140 case S_IFCHR: de->d_u.d_44.d_type = DT_CHR; break;
141 case S_IFIFO: de->d_u.d_44.d_type = DT_FIFO; break;
142 default: de->d_u.d_44.d_type = DT_UNKNOWN;
143 }
144 }
145 }
146
147 #define ufs_get_inode_uid(inode) _ufs_get_inode_uid_(inode,flags,swab)
148 static inline __u32 _ufs_get_inode_uid_(struct ufs_inode * inode,
149 unsigned flags, unsigned swab)
150 {
151 switch (flags & UFS_UID_MASK) {
152 case UFS_UID_EFT:
153 return SWAB32(inode->ui_u3.ui_sun.ui_uid);
154 case UFS_UID_44BSD:
155 return SWAB32(inode->ui_u3.ui_44.ui_uid);
156 default:
157 return SWAB16(inode->ui_u1.oldids.ui_suid);
158 }
159 }
160
161 #define ufs_set_inode_uid(inode,value) _ufs_set_inode_uid_(inode,value,flags,swab)
162 static inline void _ufs_set_inode_uid_(struct ufs_inode * inode, __u32 value,
163 unsigned flags, unsigned swab)
164 {
165 inode->ui_u1.oldids.ui_suid = SWAB16(value);
166 switch (flags & UFS_UID_MASK) {
167 case UFS_UID_EFT:
168 inode->ui_u3.ui_sun.ui_uid = SWAB32(value);
169 break;
170 case UFS_UID_44BSD:
171 inode->ui_u3.ui_44.ui_uid = SWAB32(value);
172 break;
173 }
174 }
175
176 #define ufs_get_inode_gid(inode) _ufs_get_inode_gid_(inode,flags,swab)
177 static inline __u32 _ufs_get_inode_gid_(struct ufs_inode * inode,
178 unsigned flags, unsigned swab)
179 {
180 switch (flags & UFS_UID_MASK) {
181 case UFS_UID_EFT:
182 return SWAB32(inode->ui_u3.ui_sun.ui_gid);
183 case UFS_UID_44BSD:
184 return SWAB32(inode->ui_u3.ui_44.ui_gid);
185 default:
186 return SWAB16(inode->ui_u1.oldids.ui_sgid);
187 }
188 }
189
190 #define ufs_set_inode_gid(inode,value) _ufs_set_inode_gid_(inode,value,flags,swab)
191 static inline void _ufs_set_inode_gid_(struct ufs_inode * inode, __u32 value,
192 unsigned flags, unsigned swab)
193 {
194 inode->ui_u1.oldids.ui_sgid = SWAB16(value);
195 switch (flags & UFS_UID_MASK) {
196 case UFS_UID_EFT:
197 inode->ui_u3.ui_sun.ui_gid = SWAB32(value);
198 break;
199 case UFS_UID_44BSD:
200 inode->ui_u3.ui_44.ui_gid = SWAB32(value);
201 break;
202 }
203 }
204
205
206
207 /*
208 * These functions manipulate ufs buffers
209 */
210 #define ubh_bread(dev,fragment,size) _ubh_bread_(uspi,dev,fragment,size)
211 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
212 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
213 extern void ubh_brelse (struct ufs_buffer_head *);
214 extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
215 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
216 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
217 extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
218 extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
219 extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
220 extern void ubh_bforget (struct ufs_buffer_head *);
221 extern int ubh_buffer_dirty (struct ufs_buffer_head *);
222 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
223 extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
224 #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
225 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
226
227
228
229 /*
230 * macros to get important structures from ufs_buffer_head
231 */
232 #define ubh_get_usb_first(ubh) \
233 ((struct ufs_super_block_first *)((ubh)->bh[0]->b_data))
234
235 #define ubh_get_usb_second(ubh) \
236 ((struct ufs_super_block_second *)(ubh)-> \
237 bh[UFS_SECTOR_SIZE >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE & ~uspi->s_fmask))
238
239 #define ubh_get_usb_third(ubh) \
240 ((struct ufs_super_block_third *)((ubh)-> \
241 bh[UFS_SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE*2 & ~uspi->s_fmask)))
242
243 #define ubh_get_ucg(ubh) \
244 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
245
246
247 /*
248 * Extract byte from ufs_buffer_head
249 * Extract the bits for a block from a map inside ufs_buffer_head
250 */
251 #define ubh_get_addr8(ubh,begin) \
252 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
253 ((begin) & ~uspi->s_fmask))
254
255 #define ubh_get_addr16(ubh,begin) \
256 (((u16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
257 ((begin) & (uspi->fsize>>1) - 1)))
258
259 #define ubh_get_addr32(ubh,begin) \
260 (((u32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
261 ((begin) & ((uspi->s_fsize>>2) - 1)))
262
263 #define ubh_get_addr ubh_get_addr8
264
265 #define ubh_blkmap(ubh,begin,bit) \
266 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
267
268
269 /*
270 * Macros for access to superblock array structures
271 */
272 #define ubh_postbl(ubh,cylno,i) \
273 ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
274 ? (*(__s16*)(ubh_get_addr(ubh, \
275 (unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
276 + (((cylno) * 16 + (i)) << 1) ) )) \
277 : (*(__s16*)(ubh_get_addr(ubh, \
278 uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
279
280 #define ubh_rotbl(ubh,i) \
281 ((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
282 ? (*(__u8*)(ubh_get_addr(ubh, \
283 (unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
284 : (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
285
286 /*
287 * Determine the number of available frags given a
288 * percentage to hold in reserve.
289 */
290 #define ufs_freespace(usb, percentreserved) \
291 (ufs_blkstofrags(SWAB32((usb)->fs_cstotal.cs_nbfree)) + \
292 SWAB32((usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
293
294 /*
295 * Macros to access cylinder group array structures
296 */
297 #define ubh_cg_blktot(ucpi,cylno) \
298 (*((__u32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
299
300 #define ubh_cg_blks(ucpi,cylno,rpos) \
301 (*((__u16*)ubh_get_addr(UCPI_UBH, \
302 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
303
304 /*
305 * Bitmap operations
306 * These functions work like classical bitmap operations.
307 * The difference is that we don't have the whole bitmap
308 * in one contiguous chunk of memory, but in several buffers.
309 * The parameters of each function are super_block, ufs_buffer_head and
310 * position of the beginning of the bitmap.
311 */
312 #define ubh_setbit(ubh,begin,bit) \
313 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
314
315 #define ubh_clrbit(ubh,begin,bit) \
316 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
317
318 #define ubh_isset(ubh,begin,bit) \
319 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
320
321 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
322
323 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
324
325 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
326 static inline unsigned _ubh_find_next_zero_bit_(
327 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
328 unsigned begin, unsigned size, unsigned offset)
329 {
330 unsigned base, count, pos;
331
332 size -= offset;
333 begin <<= 3;
334 offset += begin;
335 base = offset >> uspi->s_bpfshift;
336 offset &= uspi->s_bpfmask;
337 for (;;) {
338 count = min (size + offset, uspi->s_bpf);
339 size -= count - offset;
340 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
341 if (pos < count || !size)
342 break;
343 base++;
344 offset = 0;
345 }
346 return (base << uspi->s_bpfshift) + pos - begin;
347 }
348
349 static inline unsigned find_last_zero_bit (unsigned char * bitmap,
350 unsigned size, unsigned offset)
351 {
352 unsigned bit, i;
353 unsigned char * mapp;
354 unsigned char map;
355
356 mapp = bitmap + (size >> 3);
357 map = *mapp--;
358 bit = 1 << (size & 7);
359 for (i = size; i > offset; i--) {
360 if ((map & bit) == 0)
361 break;
362 if ((i & 7) != 0) {
363 bit >>= 1;
364 } else {
365 map = *mapp--;
366 bit = 1 << 7;
367 }
368 }
369 return i;
370 }
371
372 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
373 static inline unsigned _ubh_find_last_zero_bit_(
374 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
375 unsigned begin, unsigned start, unsigned end)
376 {
377 unsigned base, count, pos, size;
378
379 size = start - end;
380 begin <<= 3;
381 start += begin;
382 base = start >> uspi->s_bpfshift;
383 start &= uspi->s_bpfmask;
384 for (;;) {
385 count = min (size + (uspi->s_bpf - start), uspi->s_bpf)
386 - (uspi->s_bpf - start);
387 size -= count;
388 pos = find_last_zero_bit (ubh->bh[base]->b_data,
389 start, start - count);
390 if (pos > start - count || !size)
391 break;
392 base--;
393 start = uspi->s_bpf;
394 }
395 return (base << uspi->s_bpfshift) + pos - begin;
396 }
397
398 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
399
400 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
401 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
402 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
403 {
404 switch (uspi->s_fpb) {
405 case 8:
406 return (*ubh_get_addr (ubh, begin + block) == 0xff);
407 case 4:
408 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
409 case 2:
410 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
411 case 1:
412 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
413 }
414 return 0;
415 }
416
417 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
418 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
419 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
420 {
421 switch (uspi->s_fpb) {
422 case 8:
423 *ubh_get_addr (ubh, begin + block) = 0x00;
424 return;
425 case 4:
426 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
427 return;
428 case 2:
429 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
430 return;
431 case 1:
432 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
433 return;
434 }
435 }
436
437 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
438 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
439 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
440 {
441 switch (uspi->s_fpb) {
442 case 8:
443 *ubh_get_addr(ubh, begin + block) = 0xff;
444 return;
445 case 4:
446 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
447 return;
448 case 2:
449 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
450 return;
451 case 1:
452 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
453 return;
454 }
455 }
456
457 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
458 unsigned * fraglist, int cnt)
459 {
460 struct ufs_sb_private_info * uspi;
461 unsigned fragsize, pos;
462 unsigned swab;
463
464 swab = sb->u.ufs_sb.s_swab;
465 uspi = sb->u.ufs_sb.s_uspi;
466
467 fragsize = 0;
468 for (pos = 0; pos < uspi->s_fpb; pos++) {
469 if (blockmap & (1 << pos)) {
470 fragsize++;
471 }
472 else if (fragsize > 0) {
473 ADD_SWAB32(fraglist[fragsize], cnt);
474 fragsize = 0;
475 }
476 }
477 if (fragsize > 0 && fragsize < uspi->s_fpb)
478 ADD_SWAB32(fraglist[fragsize], cnt);
479 }
480
481 #define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
482 static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
483 unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
484 {
485 unsigned rest, offset;
486 unsigned char * cp;
487
488
489 offset = begin & ~uspi->s_fmask;
490 begin >>= uspi->s_fshift;
491 for (;;) {
492 if ((offset + size) < uspi->s_fsize)
493 rest = size;
494 else
495 rest = uspi->s_fsize - offset;
496 size -= rest;
497 cp = ubh->bh[begin]->b_data + offset;
498 while ((table[*cp++] & mask) == 0 && --rest);
499 if (rest || !size)
500 break;
501 begin++;
502 offset = 0;
503 }
504 return (size + rest);
505 }
506
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