1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/fs/ufs/util.h
4 *
5 * Copyright (C) 1998
6 * Daniel Pirkl <daniel.pirkl@email.cz>
7 * Charles University, Faculty of Mathematics and Physics
8 */
9
10 #include <linux/buffer_head.h>
11 #include <linux/fs.h>
12 #include "swab.h"
13
14 /*
15 * functions used for retyping
16 */
17 static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
18 {
19 return &cpi->c_ubh;
20 }
21 static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
22 {
23 return &spi->s_ubh;
24 }
25
26
27
28 /*
29 * macros used for accessing structures
30 */
31 static inline s32
32 ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
33 struct ufs_super_block_third *usb3)
34 {
35 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
36 case UFS_ST_SUNOS:
37 if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT)
38 return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state);
39 fallthrough; /* to UFS_ST_SUN */
40 case UFS_ST_SUN:
41 return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
42 case UFS_ST_SUNx86:
43 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
44 case UFS_ST_44BSD:
45 default:
46 return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state);
47 }
48 }
49
50 static inline void
51 ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
52 struct ufs_super_block_third *usb3, s32 value)
53 {
54 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
55 case UFS_ST_SUNOS:
56 if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT) {
57 usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value);
58 break;
59 }
60 fallthrough; /* to UFS_ST_SUN */
61 case UFS_ST_SUN:
62 usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
63 break;
64 case UFS_ST_SUNx86:
65 usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
66 break;
67 case UFS_ST_44BSD:
68 usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value);
69 break;
70 }
71 }
72
73 static inline u32
74 ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
75 struct ufs_super_block_third *usb3)
76 {
77 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
78 return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect);
79 else
80 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
81 }
82
83 static inline u64
84 ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
85 {
86 __fs64 tmp;
87
88 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
89 case UFS_ST_SUNOS:
90 case UFS_ST_SUN:
91 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
92 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
93 break;
94 case UFS_ST_SUNx86:
95 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
96 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
97 break;
98 case UFS_ST_44BSD:
99 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
100 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1];
101 break;
102 }
103
104 return fs64_to_cpu(sb, tmp);
105 }
106
107 static inline u64
108 ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
109 {
110 __fs64 tmp;
111
112 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
113 case UFS_ST_SUNOS:
114 case UFS_ST_SUN:
115 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
116 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
117 break;
118 case UFS_ST_SUNx86:
119 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
120 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
121 break;
122 case UFS_ST_44BSD:
123 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
124 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1];
125 break;
126 }
127
128 return fs64_to_cpu(sb, tmp);
129 }
130
131 static inline u16
132 ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
133 {
134 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
135 return fs16_to_cpu(sb, de->d_u.d_namlen);
136 else
137 return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
138 }
139
140 static inline void
141 ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
142 {
143 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
144 de->d_u.d_namlen = cpu_to_fs16(sb, value);
145 else
146 de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
147 }
148
149 static inline void
150 ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
151 {
152 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
153 return;
154
155 /*
156 * TODO turn this into a table lookup
157 */
158 switch (mode & S_IFMT) {
159 case S_IFSOCK:
160 de->d_u.d_44.d_type = DT_SOCK;
161 break;
162 case S_IFLNK:
163 de->d_u.d_44.d_type = DT_LNK;
164 break;
165 case S_IFREG:
166 de->d_u.d_44.d_type = DT_REG;
167 break;
168 case S_IFBLK:
169 de->d_u.d_44.d_type = DT_BLK;
170 break;
171 case S_IFDIR:
172 de->d_u.d_44.d_type = DT_DIR;
173 break;
174 case S_IFCHR:
175 de->d_u.d_44.d_type = DT_CHR;
176 break;
177 case S_IFIFO:
178 de->d_u.d_44.d_type = DT_FIFO;
179 break;
180 default:
181 de->d_u.d_44.d_type = DT_UNKNOWN;
182 }
183 }
184
185 static inline u32
186 ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
187 {
188 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
189 case UFS_UID_44BSD:
190 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
191 case UFS_UID_EFT:
192 if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
193 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
194 fallthrough;
195 default:
196 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
197 }
198 }
199
200 static inline void
201 ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
202 {
203 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
204 case UFS_UID_44BSD:
205 inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
206 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
207 break;
208 case UFS_UID_EFT:
209 inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
210 if (value > 0xFFFF)
211 value = 0xFFFF;
212 fallthrough;
213 default:
214 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
215 break;
216 }
217 }
218
219 static inline u32
220 ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
221 {
222 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
223 case UFS_UID_44BSD:
224 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
225 case UFS_UID_EFT:
226 if (inode->ui_u1.oldids.ui_sgid == 0xFFFF)
227 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
228 fallthrough;
229 default:
230 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
231 }
232 }
233
234 static inline void
235 ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
236 {
237 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
238 case UFS_UID_44BSD:
239 inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
240 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
241 break;
242 case UFS_UID_EFT:
243 inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
244 if (value > 0xFFFF)
245 value = 0xFFFF;
246 fallthrough;
247 default:
248 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
249 break;
250 }
251 }
252
253 extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
254 extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
255 extern int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len);
256
257 /*
258 * These functions manipulate ufs buffers
259 */
260 #define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
261 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
262 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
263 extern void ubh_brelse (struct ufs_buffer_head *);
264 extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
265 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
266 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
267 extern void ubh_sync_block(struct ufs_buffer_head *);
268 extern void ubh_bforget (struct ufs_buffer_head *);
269 extern int ubh_buffer_dirty (struct ufs_buffer_head *);
270 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
271 extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
272 #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
273 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
274
275 /* This functions works with cache pages*/
276 struct folio *ufs_get_locked_folio(struct address_space *mapping, pgoff_t index);
277 static inline void ufs_put_locked_folio(struct folio *folio)
278 {
279 folio_unlock(folio);
280 folio_put(folio);
281 }
282
283 /*
284 * macros and inline function to get important structures from ufs_sb_private_info
285 */
286
287 static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
288 unsigned int offset)
289 {
290 unsigned int index;
291
292 index = offset >> uspi->s_fshift;
293 offset &= ~uspi->s_fmask;
294 return uspi->s_ubh.bh[index]->b_data + offset;
295 }
296
297 #define ubh_get_usb_first(uspi) \
298 ((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
299
300 #define ubh_get_usb_second(uspi) \
301 ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
302
303 #define ubh_get_usb_third(uspi) \
304 ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
305
306
307 #define ubh_get_ucg(ubh) \
308 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
309
310
311 /*
312 * Extract byte from ufs_buffer_head
313 * Extract the bits for a block from a map inside ufs_buffer_head
314 */
315 #define ubh_get_addr8(ubh,begin) \
316 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
317 ((begin) & ~uspi->s_fmask))
318
319 #define ubh_get_addr16(ubh,begin) \
320 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
321 ((begin) & ((uspi->fsize>>1) - 1)))
322
323 #define ubh_get_addr32(ubh,begin) \
324 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
325 ((begin) & ((uspi->s_fsize>>2) - 1)))
326
327 #define ubh_get_addr64(ubh,begin) \
328 (((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \
329 ((begin) & ((uspi->s_fsize>>3) - 1)))
330
331 #define ubh_get_addr ubh_get_addr8
332
333 static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi,
334 struct ufs_buffer_head *ubh,
335 u64 blk)
336 {
337 if (uspi->fs_magic == UFS2_MAGIC)
338 return ubh_get_addr64(ubh, blk);
339 else
340 return ubh_get_addr32(ubh, blk);
341 }
342
343 #define ubh_blkmap(ubh,begin,bit) \
344 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
345
346 static inline u64
347 ufs_freefrags(struct ufs_sb_private_info *uspi)
348 {
349 return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
350 uspi->cs_total.cs_nffree;
351 }
352
353 /*
354 * Macros to access cylinder group array structures
355 */
356 #define ubh_cg_blktot(ucpi,cylno) \
357 (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
358
359 #define ubh_cg_blks(ucpi,cylno,rpos) \
360 (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
361 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
362
363 /*
364 * Bitmap operations
365 * These functions work like classical bitmap operations.
366 * The difference is that we don't have the whole bitmap
367 * in one contiguous chunk of memory, but in several buffers.
368 * The parameters of each function are super_block, ufs_buffer_head and
369 * position of the beginning of the bitmap.
370 */
371 #define ubh_setbit(ubh,begin,bit) \
372 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
373
374 #define ubh_clrbit(ubh,begin,bit) \
375 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
376
377 #define ubh_isset(ubh,begin,bit) \
378 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
379
380 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
381
382 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
383
384 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
385 static inline unsigned _ubh_find_next_zero_bit_(
386 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
387 unsigned begin, unsigned size, unsigned offset)
388 {
389 unsigned base, count, pos;
390
391 size -= offset;
392 begin <<= 3;
393 offset += begin;
394 base = offset >> uspi->s_bpfshift;
395 offset &= uspi->s_bpfmask;
396 for (;;) {
397 count = min_t(unsigned int, size + offset, uspi->s_bpf);
398 size -= count - offset;
399 pos = find_next_zero_bit_le(ubh->bh[base]->b_data, count, offset);
400 if (pos < count || !size)
401 break;
402 base++;
403 offset = 0;
404 }
405 return (base << uspi->s_bpfshift) + pos - begin;
406 }
407
408 static inline unsigned find_last_zero_bit (unsigned char * bitmap,
409 unsigned size, unsigned offset)
410 {
411 unsigned bit, i;
412 unsigned char * mapp;
413 unsigned char map;
414
415 mapp = bitmap + (size >> 3);
416 map = *mapp--;
417 bit = 1 << (size & 7);
418 for (i = size; i > offset; i--) {
419 if ((map & bit) == 0)
420 break;
421 if ((i & 7) != 0) {
422 bit >>= 1;
423 } else {
424 map = *mapp--;
425 bit = 1 << 7;
426 }
427 }
428 return i;
429 }
430
431 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
432 static inline unsigned _ubh_find_last_zero_bit_(
433 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
434 unsigned begin, unsigned start, unsigned end)
435 {
436 unsigned base, count, pos, size;
437
438 size = start - end;
439 begin <<= 3;
440 start += begin;
441 base = start >> uspi->s_bpfshift;
442 start &= uspi->s_bpfmask;
443 for (;;) {
444 count = min_t(unsigned int,
445 size + (uspi->s_bpf - start), uspi->s_bpf)
446 - (uspi->s_bpf - start);
447 size -= count;
448 pos = find_last_zero_bit (ubh->bh[base]->b_data,
449 start, start - count);
450 if (pos > start - count || !size)
451 break;
452 base--;
453 start = uspi->s_bpf;
454 }
455 return (base << uspi->s_bpfshift) + pos - begin;
456 }
457
458 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
459
460 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
461 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
462 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
463 {
464 u8 mask;
465 switch (uspi->s_fpb) {
466 case 8:
467 return (*ubh_get_addr (ubh, begin + block) == 0xff);
468 case 4:
469 mask = 0x0f << ((block & 0x01) << 2);
470 return (*ubh_get_addr (ubh, begin + (block >> 1)) & mask) == mask;
471 case 2:
472 mask = 0x03 << ((block & 0x03) << 1);
473 return (*ubh_get_addr (ubh, begin + (block >> 2)) & mask) == mask;
474 case 1:
475 mask = 0x01 << (block & 0x07);
476 return (*ubh_get_addr (ubh, begin + (block >> 3)) & mask) == mask;
477 }
478 return 0;
479 }
480
481 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
482 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
483 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
484 {
485 switch (uspi->s_fpb) {
486 case 8:
487 *ubh_get_addr (ubh, begin + block) = 0x00;
488 return;
489 case 4:
490 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
491 return;
492 case 2:
493 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
494 return;
495 case 1:
496 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
497 return;
498 }
499 }
500
501 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
502 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
503 struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
504 {
505 switch (uspi->s_fpb) {
506 case 8:
507 *ubh_get_addr(ubh, begin + block) = 0xff;
508 return;
509 case 4:
510 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
511 return;
512 case 2:
513 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
514 return;
515 case 1:
516 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
517 return;
518 }
519 }
520
521 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
522 __fs32 * fraglist, int cnt)
523 {
524 struct ufs_sb_private_info * uspi;
525 unsigned fragsize, pos;
526
527 uspi = UFS_SB(sb)->s_uspi;
528
529 fragsize = 0;
530 for (pos = 0; pos < uspi->s_fpb; pos++) {
531 if (blockmap & (1 << pos)) {
532 fragsize++;
533 }
534 else if (fragsize > 0) {
535 fs32_add(sb, &fraglist[fragsize], cnt);
536 fragsize = 0;
537 }
538 }
539 if (fragsize > 0 && fragsize < uspi->s_fpb)
540 fs32_add(sb, &fraglist[fragsize], cnt);
541 }
542
543 static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi,
544 struct ufs_inode_info *ufsi,
545 unsigned blk)
546 {
547 BUG_ON(blk > UFS_TIND_BLOCK);
548 return uspi->fs_magic == UFS2_MAGIC ?
549 (void *)&ufsi->i_u1.u2_i_data[blk] :
550 (void *)&ufsi->i_u1.i_data[blk];
551 }
552
553 static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p)
554 {
555 return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ?
556 fs64_to_cpu(sb, *(__fs64 *)p) :
557 fs32_to_cpu(sb, *(__fs32 *)p);
558 }
559
560 static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val)
561 {
562 if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC)
563 *(__fs64 *)p = cpu_to_fs64(sb, val);
564 else
565 *(__fs32 *)p = cpu_to_fs32(sb, val);
566 }
567
568 static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi,
569 void *p)
570 {
571 if (uspi->fs_magic == UFS2_MAGIC)
572 *(__fs64 *)p = 0;
573 else
574 *(__fs32 *)p = 0;
575 }
576
577 static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi,
578 void *p)
579 {
580 if (uspi->fs_magic == UFS2_MAGIC)
581 return *(__fs64 *)p == 0;
582 else
583 return *(__fs32 *)p == 0;
584 }
585
586 static inline __fs32 ufs_get_seconds(struct super_block *sbp)
587 {
588 time64_t now = ktime_get_real_seconds();
589
590 /* Signed 32-bit interpretation wraps around in 2038, which
591 * happens in ufs1 inode stamps but not ufs2 using 64-bits
592 * stamps. For superblock and blockgroup, let's assume
593 * unsigned 32-bit stamps, which are good until y2106.
594 * Wrap around rather than clamp here to make the dirty
595 * file system detection work in the superblock stamp.
596 */
597 return cpu_to_fs32(sbp, lower_32_bits(now));
598 }
599
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