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/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/* 20 * functions used for retyping 21 */ 22static 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} 30 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_SUNOS: 42 if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT) 43 return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state); 44 /* Fall Through to UFS_ST_SUN */ 45 case UFS_ST_SUN: 46 return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state); 47 case UFS_ST_SUNx86: 48 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state); 49 case UFS_ST_44BSD: 50 default: 51 return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state); 52 } 53} 54 55static inline void 56ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1, 57 struct ufs_super_block_third *usb3, s32 value) 58{ 59 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 60 case UFS_ST_SUNOS: 61 if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT) { 62 usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value); 63 break; 64 } 65 /* Fall Through to UFS_ST_SUN */ 66 case UFS_ST_SUN: 67 usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value); 68 break; 69 case UFS_ST_SUNx86: 70 usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value); 71 break; 72 case UFS_ST_44BSD: 73 usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value); 74 break; 75 } 76} 77 78static inline u32 79ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1, 80 struct ufs_super_block_third *usb3) 81{ 82 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) 83 return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect); 84 else 85 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect); 86} 87 88static inline u64 89ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3) 90{ 91 __fs64 tmp; 92 93 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 94 case UFS_ST_SUNOS: 95 case UFS_ST_SUN: 96 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0]; 97 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1]; 98 break; 99 case UFS_ST_SUNx86: 100 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0]; 101 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1]; 102 break; 103 case UFS_ST_44BSD: 104 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0]; 105 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1]; 106 break; 107 } 108 109 return fs64_to_cpu(sb, tmp); 110} 111 112static inline u64 113ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3) 114{ 115 __fs64 tmp; 116 117 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { 118 case UFS_ST_SUNOS: 119 case UFS_ST_SUN: 120 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0]; 121 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1]; 122 break; 123 case UFS_ST_SUNx86: 124 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0]; 125 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1]; 126 break; 127 case UFS_ST_44BSD: 128 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0]; 129 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1]; 130 break; 131 } 132 133 return fs64_to_cpu(sb, tmp); 134} 135 136static inline u16 137ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de) 138{ 139 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD) 140 return fs16_to_cpu(sb, de->d_u.d_namlen); 141 else 142 return de->d_u.d_44.d_namlen; 143} 144 145static inline void 146ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value) 147{ 148 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD) 149 de->d_u.d_namlen = cpu_to_fs16(sb, value); 150 else 151 de->d_u.d_44.d_namlen = value; 152} 153 154static inline void 155ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode) 156{ 157 if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD) 158 return; 159 160 /* 161 * TODO turn this into a table lookup 162 */ 163 switch (mode & S_IFMT) { 164 case S_IFSOCK: 165 de->d_u.d_44.d_type = DT_SOCK; 166 break; 167 case S_IFLNK: 168 de->d_u.d_44.d_type = DT_LNK; 169 break; 170 case S_IFREG: 171 de->d_u.d_44.d_type = DT_REG; 172 break; 173 case S_IFBLK: 174 de->d_u.d_44.d_type = DT_BLK; 175 break; 176 case S_IFDIR: 177 de->d_u.d_44.d_type = DT_DIR; 178 break; 179 case S_IFCHR: 180 de->d_u.d_44.d_type = DT_CHR; 181 break; 182 case S_IFIFO: 183 de->d_u.d_44.d_type = DT_FIFO; 184 break; 185 default: 186 de->d_u.d_44.d_type = DT_UNKNOWN; 187 } 188} 189 190static inline u32 191ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode) 192{ 193 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) { 194 case UFS_UID_44BSD: 195 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid); 196 case UFS_UID_EFT: 197 if (inode->ui_u1.oldids.ui_suid == 0xFFFF) 198 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid); 199 /* Fall through */ 200 default: 201 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid); 202 } 203} 204 205static inline void 206ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value) 207{ 208 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) { 209 case UFS_UID_44BSD: 210 inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value); 211 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value); 212 break; 213 case UFS_UID_EFT: 214 inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value); 215 if (value > 0xFFFF) 216 value = 0xFFFF; 217 /* Fall through */ 218 default: 219 inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value); 220 break; 221 } 222} 223 224static inline u32 225ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode) 226{ 227 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) { 228 case UFS_UID_44BSD: 229 return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid); 230 case UFS_UID_EFT: 231 if (inode->ui_u1.oldids.ui_suid == 0xFFFF) 232 return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid); 233 /* Fall through */ 234 default: 235 return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid); 236 } 237} 238 239static inline void 240ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value) 241{ 242 switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) { 243 case UFS_UID_44BSD: 244 inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value); 245 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value); 246 break; 247 case UFS_UID_EFT: 248 inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value); 249 if (value > 0xFFFF) 250 value = 0xFFFF; 251 /* Fall through */ 252 default: 253 inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value); 254 break; 255 } 256} 257 258extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *); 259extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t); 260extern int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len); 261 262/* 263 * These functions manipulate ufs buffers 264 */ 265#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size) 266extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64); 267extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64); 268extern void ubh_brelse (struct ufs_buffer_head *); 269extern void ubh_brelse_uspi (struct ufs_sb_private_info *); 270extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *); 271extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int); 272extern void ubh_sync_block(struct ufs_buffer_head *); 273extern void ubh_bforget (struct ufs_buffer_head *); 274extern int ubh_buffer_dirty (struct ufs_buffer_head *); 275#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size) 276extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned); 277#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size) 278extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned); 279 280/* This functions works with cache pages*/ 281extern struct page *ufs_get_locked_page(struct address_space *mapping, 282 pgoff_t index); 283static inline void ufs_put_locked_page(struct page *page) 284{ 285 unlock_page(page); 286 page_cache_release(page); 287} 288 289 290/* 291 * macros and inline function to get important structures from ufs_sb_private_info 292 */ 293 294static inline void *get_usb_offset(struct ufs_sb_private_info *uspi, 295 unsigned int offset) 296{ 297 unsigned int index; 298 299 index = offset >> uspi->s_fshift; 300 offset &= ~uspi->s_fmask; 301 return uspi->s_ubh.bh[index]->b_data + offset; 302} 303 304#define ubh_get_usb_first(uspi) \ 305 ((struct ufs_super_block_first *)get_usb_offset((uspi), 0)) 306 307#define ubh_get_usb_second(uspi) \ 308 ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE)) 309 310#define ubh_get_usb_third(uspi) \ 311 ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE)) 312 313 314#define ubh_get_ucg(ubh) \ 315 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data)) 316 317 318/* 319 * Extract byte from ufs_buffer_head 320 * Extract the bits for a block from a map inside ufs_buffer_head 321 */ 322#define ubh_get_addr8(ubh,begin) \ 323 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \ 324 ((begin) & ~uspi->s_fmask)) 325 326#define ubh_get_addr16(ubh,begin) \ 327 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \ 328 ((begin) & ((uspi->fsize>>1) - 1))) 329 330#define ubh_get_addr32(ubh,begin) \ 331 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \ 332 ((begin) & ((uspi->s_fsize>>2) - 1))) 333 334#define ubh_get_addr64(ubh,begin) \ 335 (((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \ 336 ((begin) & ((uspi->s_fsize>>3) - 1))) 337 338#define ubh_get_addr ubh_get_addr8 339 340static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi, 341 struct ufs_buffer_head *ubh, 342 u64 blk) 343{ 344 if (uspi->fs_magic == UFS2_MAGIC) 345 return ubh_get_addr64(ubh, blk); 346 else 347 return ubh_get_addr32(ubh, blk); 348} 349 350#define ubh_blkmap(ubh,begin,bit) \ 351 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb))) 352 353/* 354 * Determine the number of available frags given a 355 * percentage to hold in reserve. 356 */ 357static inline u64 358ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved) 359{ 360 return ufs_blkstofrags(uspi->cs_total.cs_nbfree) + 361 uspi->cs_total.cs_nffree - 362 (uspi->s_dsize * (percentreserved) / 100); 363} 364 365/* 366 * Macros to access cylinder group array structures 367 */ 368#define ubh_cg_blktot(ucpi,cylno) \ 369 (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2)))) 370 371#define ubh_cg_blks(ucpi,cylno,rpos) \ 372 (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \ 373 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 )))) 374 375/* 376 * Bitmap operations 377 * These functions work like classical bitmap operations. 378 * The difference is that we don't have the whole bitmap 379 * in one contiguous chunk of memory, but in several buffers. 380 * The parameters of each function are super_block, ufs_buffer_head and 381 * position of the beginning of the bitmap. 382 */ 383#define ubh_setbit(ubh,begin,bit) \ 384 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7))) 385 386#define ubh_clrbit(ubh,begin,bit) \ 387 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7))) 388 389#define ubh_isset(ubh,begin,bit) \ 390 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7))) 391 392#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit)) 393 394#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0) 395 396#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset) 397static inline unsigned _ubh_find_next_zero_bit_( 398 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 399 unsigned begin, unsigned size, unsigned offset) 400{ 401 unsigned base, count, pos; 402 403 size -= offset; 404 begin <<= 3; 405 offset += begin; 406 base = offset >> uspi->s_bpfshift; 407 offset &= uspi->s_bpfmask; 408 for (;;) { 409 count = min_t(unsigned int, size + offset, uspi->s_bpf); 410 size -= count - offset; 411 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset); 412 if (pos < count || !size) 413 break; 414 base++; 415 offset = 0; 416 } 417 return (base << uspi->s_bpfshift) + pos - begin; 418} 419 420static inline unsigned find_last_zero_bit (unsigned char * bitmap, 421 unsigned size, unsigned offset) 422{ 423 unsigned bit, i; 424 unsigned char * mapp; 425 unsigned char map; 426 427 mapp = bitmap + (size >> 3); 428 map = *mapp--; 429 bit = 1 << (size & 7); 430 for (i = size; i > offset; i--) { 431 if ((map & bit) == 0) 432 break; 433 if ((i & 7) != 0) { 434 bit >>= 1; 435 } else { 436 map = *mapp--; 437 bit = 1 << 7; 438 } 439 } 440 return i; 441} 442 443#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset) 444static inline unsigned _ubh_find_last_zero_bit_( 445 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 446 unsigned begin, unsigned start, unsigned end) 447{ 448 unsigned base, count, pos, size; 449 450 size = start - end; 451 begin <<= 3; 452 start += begin; 453 base = start >> uspi->s_bpfshift; 454 start &= uspi->s_bpfmask; 455 for (;;) { 456 count = min_t(unsigned int, 457 size + (uspi->s_bpf - start), uspi->s_bpf) 458 - (uspi->s_bpf - start); 459 size -= count; 460 pos = find_last_zero_bit (ubh->bh[base]->b_data, 461 start, start - count); 462 if (pos > start - count || !size) 463 break; 464 base--; 465 start = uspi->s_bpf; 466 } 467 return (base << uspi->s_bpfshift) + pos - begin; 468} 469 470#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block)) 471 472#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block) 473static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi, 474 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 475{ 476 switch (uspi->s_fpb) { 477 case 8: 478 return (*ubh_get_addr (ubh, begin + block) == 0xff); 479 case 4: 480 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2))); 481 case 2: 482 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1))); 483 case 1: 484 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07))); 485 } 486 return 0; 487} 488 489#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block) 490static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi, 491 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 492{ 493 switch (uspi->s_fpb) { 494 case 8: 495 *ubh_get_addr (ubh, begin + block) = 0x00; 496 return; 497 case 4: 498 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2)); 499 return; 500 case 2: 501 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1)); 502 return; 503 case 1: 504 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07))); 505 return; 506 } 507} 508 509#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block) 510static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi, 511 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 512{ 513 switch (uspi->s_fpb) { 514 case 8: 515 *ubh_get_addr(ubh, begin + block) = 0xff; 516 return; 517 case 4: 518 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2)); 519 return; 520 case 2: 521 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1)); 522 return; 523 case 1: 524 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07))); 525 return; 526 } 527} 528 529static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap, 530 __fs32 * fraglist, int cnt) 531{ 532 struct ufs_sb_private_info * uspi; 533 unsigned fragsize, pos; 534 535 uspi = UFS_SB(sb)->s_uspi; 536 537 fragsize = 0; 538 for (pos = 0; pos < uspi->s_fpb; pos++) { 539 if (blockmap & (1 << pos)) { 540 fragsize++; 541 } 542 else if (fragsize > 0) { 543 fs32_add(sb, &fraglist[fragsize], cnt); 544 fragsize = 0; 545 } 546 } 547 if (fragsize > 0 && fragsize < uspi->s_fpb) 548 fs32_add(sb, &fraglist[fragsize], cnt); 549} 550 551static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi, 552 struct ufs_inode_info *ufsi, 553 unsigned blk) 554{ 555 BUG_ON(blk > UFS_TIND_BLOCK); 556 return uspi->fs_magic == UFS2_MAGIC ? 557 (void *)&ufsi->i_u1.u2_i_data[blk] : 558 (void *)&ufsi->i_u1.i_data[blk]; 559} 560 561static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p) 562{ 563 return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ? 564 fs64_to_cpu(sb, *(__fs64 *)p) : 565 fs32_to_cpu(sb, *(__fs32 *)p); 566} 567 568static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val) 569{ 570 if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC) 571 *(__fs64 *)p = cpu_to_fs64(sb, val); 572 else 573 *(__fs32 *)p = cpu_to_fs32(sb, val); 574} 575 576static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi, 577 void *p) 578{ 579 if (uspi->fs_magic == UFS2_MAGIC) 580 *(__fs64 *)p = 0; 581 else 582 *(__fs32 *)p = 0; 583} 584 585static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi, 586 void *p) 587{ 588 if (uspi->fs_magic == UFS2_MAGIC) 589 return *(__fs64 *)p == 0; 590 else 591 return *(__fs32 *)p == 0; 592} 593