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 */ 17static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi) 18{ 19 return &cpi->c_ubh; 20} 21static 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 */ 31static inline s32 32ufs_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 50static inline void 51ufs_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 73static inline u32 74ufs_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 83static inline u64 84ufs_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 107static inline u64 108ufs_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 131static inline u16 132ufs_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 140static inline void 141ufs_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 149static inline void 150ufs_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 185static inline u32 186ufs_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 200static inline void 201ufs_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 219static inline u32 220ufs_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 234static inline void 235ufs_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 253extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *); 254extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t); 255extern 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) 261extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64); 262extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64); 263extern void ubh_brelse (struct ufs_buffer_head *); 264extern void ubh_brelse_uspi (struct ufs_sb_private_info *); 265extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *); 266extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int); 267extern void ubh_sync_block(struct ufs_buffer_head *); 268extern void ubh_bforget (struct ufs_buffer_head *); 269extern int ubh_buffer_dirty (struct ufs_buffer_head *); 270#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size) 271extern 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) 273extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned); 274 275/* This functions works with cache pages*/ 276struct folio *ufs_get_locked_folio(struct address_space *mapping, pgoff_t index); 277static 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 287static 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 333static 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 346static inline u64 347ufs_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) 385static 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 408static 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) 432static 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) 461static 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) 482static 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) 502static 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 521static 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 543static 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 553static 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 560static 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 568static 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 577static 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 586static 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