blob: 406981fff5e7ca01317a7aa26c34f803827ec7fc [file] [log] [blame]
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/*
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070020 * functions used for retyping
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 */
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070022static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
23{
24 return &cpi->c_ubh;
25}
26static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
27{
28 return &spi->s_ubh;
29}
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31
32
33/*
34 * macros used for accessing structures
35 */
36static inline s32
37ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
38 struct ufs_super_block_third *usb3)
39{
40 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
41 case UFS_ST_SUN:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070042 return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 case UFS_ST_SUNx86:
44 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
45 case UFS_ST_44BSD:
46 default:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070047 return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 }
49}
50
51static inline void
52ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
53 struct ufs_super_block_third *usb3, s32 value)
54{
55 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
56 case UFS_ST_SUN:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070057 usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 break;
59 case UFS_ST_SUNx86:
60 usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
61 break;
62 case UFS_ST_44BSD:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070063 usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 break;
65 }
66}
67
68static inline u32
69ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
70 struct ufs_super_block_third *usb3)
71{
72 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070073 return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 else
75 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
76}
77
78static inline u64
79ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
80{
81 __fs64 tmp;
82
83 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
84 case UFS_ST_SUN:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070085 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
86 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 break;
88 case UFS_ST_SUNx86:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070089 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
90 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 break;
92 case UFS_ST_44BSD:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -070093 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
94 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 break;
96 }
97
98 return fs64_to_cpu(sb, tmp);
99}
100
101static inline u64
102ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
103{
104 __fs64 tmp;
105
106 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
107 case UFS_ST_SUN:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -0700108 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
109 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 break;
111 case UFS_ST_SUNx86:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -0700112 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
113 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 break;
115 case UFS_ST_44BSD:
Evgeniy Dushistov647b7e82006-06-25 05:47:29 -0700116 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
117 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 break;
119 }
120
121 return fs64_to_cpu(sb, tmp);
122}
123
124static inline u16
125ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
126{
127 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
128 return fs16_to_cpu(sb, de->d_u.d_namlen);
129 else
130 return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
131}
132
133static inline void
134ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
135{
136 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
137 de->d_u.d_namlen = cpu_to_fs16(sb, value);
138 else
139 de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
140}
141
142static inline void
143ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
144{
145 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
146 return;
147
148 /*
149 * TODO turn this into a table lookup
150 */
151 switch (mode & S_IFMT) {
152 case S_IFSOCK:
153 de->d_u.d_44.d_type = DT_SOCK;
154 break;
155 case S_IFLNK:
156 de->d_u.d_44.d_type = DT_LNK;
157 break;
158 case S_IFREG:
159 de->d_u.d_44.d_type = DT_REG;
160 break;
161 case S_IFBLK:
162 de->d_u.d_44.d_type = DT_BLK;
163 break;
164 case S_IFDIR:
165 de->d_u.d_44.d_type = DT_DIR;
166 break;
167 case S_IFCHR:
168 de->d_u.d_44.d_type = DT_CHR;
169 break;
170 case S_IFIFO:
171 de->d_u.d_44.d_type = DT_FIFO;
172 break;
173 default:
174 de->d_u.d_44.d_type = DT_UNKNOWN;
175 }
176}
177
178static inline u32
179ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
180{
181 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
182 case UFS_UID_EFT:
183 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
184 case UFS_UID_44BSD:
185 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
186 default:
187 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
188 }
189}
190
191static inline void
192ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
193{
194 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
195 case UFS_UID_EFT:
196 inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
197 break;
198 case UFS_UID_44BSD:
199 inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
200 break;
201 }
202 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
203}
204
205static inline u32
206ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
207{
208 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
209 case UFS_UID_EFT:
210 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
211 case UFS_UID_44BSD:
212 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
213 default:
214 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
215 }
216}
217
218static inline void
219ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
220{
221 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
222 case UFS_UID_EFT:
223 inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
224 break;
225 case UFS_UID_44BSD:
226 inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
227 break;
228 }
229 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
230}
231
232extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
233extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
234
235/*
236 * These functions manipulate ufs buffers
237 */
238#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
239extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
240extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
241extern void ubh_brelse (struct ufs_buffer_head *);
242extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
243extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
244extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
Evgeniy Dushistov098d5af2006-06-25 05:47:31 -0700245extern void ubh_ll_rw_block(int, struct ufs_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247extern void ubh_bforget (struct ufs_buffer_head *);
248extern int ubh_buffer_dirty (struct ufs_buffer_head *);
249#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
250extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
251#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
252extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
253
254
255
256/*
Evgeniy7b4ee732006-01-14 11:42:06 +0300257 * macros and inline function to get important structures from ufs_sb_private_info
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Evgeniy7b4ee732006-01-14 11:42:06 +0300260static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
261 unsigned int offset)
262{
263 unsigned int index;
264
265 index = offset >> uspi->s_fshift;
266 offset &= ~uspi->s_fmask;
267 return uspi->s_ubh.bh[index]->b_data + offset;
268}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Evgeniy7b4ee732006-01-14 11:42:06 +0300270#define ubh_get_usb_first(uspi) \
271 ((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
272
273#define ubh_get_usb_second(uspi) \
274 ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
275
276#define ubh_get_usb_third(uspi) \
277 ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280#define ubh_get_ucg(ubh) \
281 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
282
283
284/*
285 * Extract byte from ufs_buffer_head
286 * Extract the bits for a block from a map inside ufs_buffer_head
287 */
288#define ubh_get_addr8(ubh,begin) \
289 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
290 ((begin) & ~uspi->s_fmask))
291
292#define ubh_get_addr16(ubh,begin) \
293 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
294 ((begin) & (uspi->fsize>>1) - 1)))
295
296#define ubh_get_addr32(ubh,begin) \
297 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
298 ((begin) & ((uspi->s_fsize>>2) - 1)))
299
300#define ubh_get_addr ubh_get_addr8
301
302#define ubh_blkmap(ubh,begin,bit) \
303 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/*
306 * Determine the number of available frags given a
307 * percentage to hold in reserve.
308 */
Evgeniy Dushistovee3ffd62006-06-25 05:47:30 -0700309static inline u64
310ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved)
311{
312 return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
313 uspi->cs_total.cs_nffree -
314 (uspi->s_dsize * (percentreserved) / 100);
315}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317/*
318 * Macros to access cylinder group array structures
319 */
320#define ubh_cg_blktot(ucpi,cylno) \
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -0700321 (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323#define ubh_cg_blks(ucpi,cylno,rpos) \
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -0700324 (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
326
327/*
328 * Bitmap operations
329 * These functions work like classical bitmap operations.
330 * The difference is that we don't have the whole bitmap
331 * in one contiguous chunk of memory, but in several buffers.
332 * The parameters of each function are super_block, ufs_buffer_head and
333 * position of the beginning of the bitmap.
334 */
335#define ubh_setbit(ubh,begin,bit) \
336 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
337
338#define ubh_clrbit(ubh,begin,bit) \
339 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
340
341#define ubh_isset(ubh,begin,bit) \
342 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
343
344#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
345
346#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
347
348#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
349static inline unsigned _ubh_find_next_zero_bit_(
350 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
351 unsigned begin, unsigned size, unsigned offset)
352{
353 unsigned base, count, pos;
354
355 size -= offset;
356 begin <<= 3;
357 offset += begin;
358 base = offset >> uspi->s_bpfshift;
359 offset &= uspi->s_bpfmask;
360 for (;;) {
361 count = min_t(unsigned int, size + offset, uspi->s_bpf);
362 size -= count - offset;
363 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
364 if (pos < count || !size)
365 break;
366 base++;
367 offset = 0;
368 }
369 return (base << uspi->s_bpfshift) + pos - begin;
370}
371
372static inline unsigned find_last_zero_bit (unsigned char * bitmap,
373 unsigned size, unsigned offset)
374{
375 unsigned bit, i;
376 unsigned char * mapp;
377 unsigned char map;
378
379 mapp = bitmap + (size >> 3);
380 map = *mapp--;
381 bit = 1 << (size & 7);
382 for (i = size; i > offset; i--) {
383 if ((map & bit) == 0)
384 break;
385 if ((i & 7) != 0) {
386 bit >>= 1;
387 } else {
388 map = *mapp--;
389 bit = 1 << 7;
390 }
391 }
392 return i;
393}
394
395#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
396static inline unsigned _ubh_find_last_zero_bit_(
397 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
398 unsigned begin, unsigned start, unsigned end)
399{
400 unsigned base, count, pos, size;
401
402 size = start - end;
403 begin <<= 3;
404 start += begin;
405 base = start >> uspi->s_bpfshift;
406 start &= uspi->s_bpfmask;
407 for (;;) {
408 count = min_t(unsigned int,
409 size + (uspi->s_bpf - start), uspi->s_bpf)
410 - (uspi->s_bpf - start);
411 size -= count;
412 pos = find_last_zero_bit (ubh->bh[base]->b_data,
413 start, start - count);
414 if (pos > start - count || !size)
415 break;
416 base--;
417 start = uspi->s_bpf;
418 }
419 return (base << uspi->s_bpfshift) + pos - begin;
420}
421
422#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
423
424#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
425static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
426 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
427{
428 switch (uspi->s_fpb) {
429 case 8:
430 return (*ubh_get_addr (ubh, begin + block) == 0xff);
431 case 4:
432 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
433 case 2:
434 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
435 case 1:
436 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
437 }
438 return 0;
439}
440
441#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
442static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
443 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
444{
445 switch (uspi->s_fpb) {
446 case 8:
447 *ubh_get_addr (ubh, begin + block) = 0x00;
448 return;
449 case 4:
450 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
451 return;
452 case 2:
453 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
454 return;
455 case 1:
456 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
457 return;
458 }
459}
460
461#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
462static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
463 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
464{
465 switch (uspi->s_fpb) {
466 case 8:
467 *ubh_get_addr(ubh, begin + block) = 0xff;
468 return;
469 case 4:
470 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
471 return;
472 case 2:
473 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
474 return;
475 case 1:
476 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
477 return;
478 }
479}
480
481static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
482 __fs32 * fraglist, int cnt)
483{
484 struct ufs_sb_private_info * uspi;
485 unsigned fragsize, pos;
486
487 uspi = UFS_SB(sb)->s_uspi;
488
489 fragsize = 0;
490 for (pos = 0; pos < uspi->s_fpb; pos++) {
491 if (blockmap & (1 << pos)) {
492 fragsize++;
493 }
494 else if (fragsize > 0) {
495 fs32_add(sb, &fraglist[fragsize], cnt);
496 fragsize = 0;
497 }
498 }
499 if (fragsize > 0 && fragsize < uspi->s_fpb)
500 fs32_add(sb, &fraglist[fragsize], cnt);
501}