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