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 */ 22 static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi) 23 { 24 return &cpi->c_ubh; 25 } 26 static 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 */ 36 static inline s32 37 ufs_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: 42 return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state); 43 case UFS_ST_SUNx86: 44 return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state); 45 case UFS_ST_44BSD: 46 default: 47 return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state); 48 } 49 } 50 51 static inline void 52 ufs_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: 57 usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value); 58 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: 63 usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value); 64 break; 65 } 66 } 67 68 static inline u32 69 ufs_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) 73 return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect); 74 else 75 return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect); 76 } 77 78 static inline u64 79 ufs_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: 85 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0]; 86 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1]; 87 break; 88 case UFS_ST_SUNx86: 89 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0]; 90 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1]; 91 break; 92 case UFS_ST_44BSD: 93 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0]; 94 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1]; 95 break; 96 } 97 98 return fs64_to_cpu(sb, tmp); 99 } 100 101 static inline u64 102 ufs_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: 108 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0]; 109 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1]; 110 break; 111 case UFS_ST_SUNx86: 112 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0]; 113 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1]; 114 break; 115 case UFS_ST_44BSD: 116 ((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0]; 117 ((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1]; 118 break; 119 } 120 121 return fs64_to_cpu(sb, tmp); 122 } 123 124 static inline u16 125 ufs_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 } 132 133 static inline void 134 ufs_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 } 141 142 static inline void 143 ufs_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 } 177 178 static inline u32 179 ufs_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 } 190 191 static inline void 192 ufs_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 } 204 205 static inline u32 206 ufs_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 } 217 218 static inline void 219 ufs_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 } 231 232 extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *); 233 extern 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) 239 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64); 240 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64); 241 extern void ubh_brelse (struct ufs_buffer_head *); 242 extern void ubh_brelse_uspi (struct ufs_sb_private_info *); 243 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *); 244 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int); 245 extern void ubh_ll_rw_block(int, struct ufs_buffer_head *); 246 extern void ubh_wait_on_buffer (struct ufs_buffer_head *); 247 extern void ubh_bforget (struct ufs_buffer_head *); 248 extern int ubh_buffer_dirty (struct ufs_buffer_head *); 249 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size) 250 extern 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) 252 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned); 253 254 /* This functions works with cache pages*/ 255 extern struct page *ufs_get_locked_page(struct address_space *mapping, 256 pgoff_t index); 257 static inline void ufs_put_locked_page(struct page *page) 258 { 259 unlock_page(page); 260 page_cache_release(page); 261 } 262 263 264 /* 265 * macros and inline function to get important structures from ufs_sb_private_info 266 */ 267 268 static inline void *get_usb_offset(struct ufs_sb_private_info *uspi, 269 unsigned int offset) 270 { 271 unsigned int index; 272 273 index = offset >> uspi->s_fshift; 274 offset &= ~uspi->s_fmask; 275 return uspi->s_ubh.bh[index]->b_data + offset; 276 } 277 278 #define ubh_get_usb_first(uspi) \ 279 ((struct ufs_super_block_first *)get_usb_offset((uspi), 0)) 280 281 #define ubh_get_usb_second(uspi) \ 282 ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE)) 283 284 #define ubh_get_usb_third(uspi) \ 285 ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE)) 286 287 288 #define ubh_get_ucg(ubh) \ 289 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data)) 290 291 292 /* 293 * Extract byte from ufs_buffer_head 294 * Extract the bits for a block from a map inside ufs_buffer_head 295 */ 296 #define ubh_get_addr8(ubh,begin) \ 297 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \ 298 ((begin) & ~uspi->s_fmask)) 299 300 #define ubh_get_addr16(ubh,begin) \ 301 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \ 302 ((begin) & ((uspi->fsize>>1) - 1))) 303 304 #define ubh_get_addr32(ubh,begin) \ 305 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \ 306 ((begin) & ((uspi->s_fsize>>2) - 1))) 307 308 #define ubh_get_addr64(ubh,begin) \ 309 (((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \ 310 ((begin) & ((uspi->s_fsize>>3) - 1))) 311 312 #define ubh_get_addr ubh_get_addr8 313 314 static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi, 315 struct ufs_buffer_head *ubh, 316 u64 blk) 317 { 318 if (uspi->fs_magic == UFS2_MAGIC) 319 return ubh_get_addr64(ubh, blk); 320 else 321 return ubh_get_addr32(ubh, blk); 322 } 323 324 #define ubh_blkmap(ubh,begin,bit) \ 325 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb))) 326 327 /* 328 * Determine the number of available frags given a 329 * percentage to hold in reserve. 330 */ 331 static inline u64 332 ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved) 333 { 334 return ufs_blkstofrags(uspi->cs_total.cs_nbfree) + 335 uspi->cs_total.cs_nffree - 336 (uspi->s_dsize * (percentreserved) / 100); 337 } 338 339 /* 340 * Macros to access cylinder group array structures 341 */ 342 #define ubh_cg_blktot(ucpi,cylno) \ 343 (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2)))) 344 345 #define ubh_cg_blks(ucpi,cylno,rpos) \ 346 (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \ 347 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 )))) 348 349 /* 350 * Bitmap operations 351 * These functions work like classical bitmap operations. 352 * The difference is that we don't have the whole bitmap 353 * in one contiguous chunk of memory, but in several buffers. 354 * The parameters of each function are super_block, ufs_buffer_head and 355 * position of the beginning of the bitmap. 356 */ 357 #define ubh_setbit(ubh,begin,bit) \ 358 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7))) 359 360 #define ubh_clrbit(ubh,begin,bit) \ 361 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7))) 362 363 #define ubh_isset(ubh,begin,bit) \ 364 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7))) 365 366 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit)) 367 368 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0) 369 370 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset) 371 static inline unsigned _ubh_find_next_zero_bit_( 372 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 373 unsigned begin, unsigned size, unsigned offset) 374 { 375 unsigned base, count, pos; 376 377 size -= offset; 378 begin <<= 3; 379 offset += begin; 380 base = offset >> uspi->s_bpfshift; 381 offset &= uspi->s_bpfmask; 382 for (;;) { 383 count = min_t(unsigned int, size + offset, uspi->s_bpf); 384 size -= count - offset; 385 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset); 386 if (pos < count || !size) 387 break; 388 base++; 389 offset = 0; 390 } 391 return (base << uspi->s_bpfshift) + pos - begin; 392 } 393 394 static inline unsigned find_last_zero_bit (unsigned char * bitmap, 395 unsigned size, unsigned offset) 396 { 397 unsigned bit, i; 398 unsigned char * mapp; 399 unsigned char map; 400 401 mapp = bitmap + (size >> 3); 402 map = *mapp--; 403 bit = 1 << (size & 7); 404 for (i = size; i > offset; i--) { 405 if ((map & bit) == 0) 406 break; 407 if ((i & 7) != 0) { 408 bit >>= 1; 409 } else { 410 map = *mapp--; 411 bit = 1 << 7; 412 } 413 } 414 return i; 415 } 416 417 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset) 418 static inline unsigned _ubh_find_last_zero_bit_( 419 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 420 unsigned begin, unsigned start, unsigned end) 421 { 422 unsigned base, count, pos, size; 423 424 size = start - end; 425 begin <<= 3; 426 start += begin; 427 base = start >> uspi->s_bpfshift; 428 start &= uspi->s_bpfmask; 429 for (;;) { 430 count = min_t(unsigned int, 431 size + (uspi->s_bpf - start), uspi->s_bpf) 432 - (uspi->s_bpf - start); 433 size -= count; 434 pos = find_last_zero_bit (ubh->bh[base]->b_data, 435 start, start - count); 436 if (pos > start - count || !size) 437 break; 438 base--; 439 start = uspi->s_bpf; 440 } 441 return (base << uspi->s_bpfshift) + pos - begin; 442 } 443 444 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block)) 445 446 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block) 447 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi, 448 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 449 { 450 switch (uspi->s_fpb) { 451 case 8: 452 return (*ubh_get_addr (ubh, begin + block) == 0xff); 453 case 4: 454 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2))); 455 case 2: 456 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1))); 457 case 1: 458 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07))); 459 } 460 return 0; 461 } 462 463 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block) 464 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi, 465 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 466 { 467 switch (uspi->s_fpb) { 468 case 8: 469 *ubh_get_addr (ubh, begin + block) = 0x00; 470 return; 471 case 4: 472 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2)); 473 return; 474 case 2: 475 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1)); 476 return; 477 case 1: 478 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07))); 479 return; 480 } 481 } 482 483 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block) 484 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi, 485 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 486 { 487 switch (uspi->s_fpb) { 488 case 8: 489 *ubh_get_addr(ubh, begin + block) = 0xff; 490 return; 491 case 4: 492 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2)); 493 return; 494 case 2: 495 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1)); 496 return; 497 case 1: 498 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07))); 499 return; 500 } 501 } 502 503 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap, 504 __fs32 * fraglist, int cnt) 505 { 506 struct ufs_sb_private_info * uspi; 507 unsigned fragsize, pos; 508 509 uspi = UFS_SB(sb)->s_uspi; 510 511 fragsize = 0; 512 for (pos = 0; pos < uspi->s_fpb; pos++) { 513 if (blockmap & (1 << pos)) { 514 fragsize++; 515 } 516 else if (fragsize > 0) { 517 fs32_add(sb, &fraglist[fragsize], cnt); 518 fragsize = 0; 519 } 520 } 521 if (fragsize > 0 && fragsize < uspi->s_fpb) 522 fs32_add(sb, &fraglist[fragsize], cnt); 523 } 524 525 static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi, 526 struct ufs_inode_info *ufsi, 527 unsigned blk) 528 { 529 BUG_ON(blk > UFS_TIND_BLOCK); 530 return uspi->fs_magic == UFS2_MAGIC ? 531 (void *)&ufsi->i_u1.u2_i_data[blk] : 532 (void *)&ufsi->i_u1.i_data[blk]; 533 } 534 535 static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p) 536 { 537 return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ? 538 fs64_to_cpu(sb, *(__fs64 *)p) : 539 fs32_to_cpu(sb, *(__fs32 *)p); 540 } 541 542 static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val) 543 { 544 if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC) 545 *(__fs64 *)p = cpu_to_fs64(sb, val); 546 else 547 *(__fs32 *)p = cpu_to_fs32(sb, val); 548 } 549 550 static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi, 551 void *p) 552 { 553 if (uspi->fs_magic == UFS2_MAGIC) 554 *(__fs64 *)p = 0; 555 else 556 *(__fs32 *)p = 0; 557 } 558 559 static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi, 560 void *p) 561 { 562 if (uspi->fs_magic == UFS2_MAGIC) 563 return *(__fs64 *)p == 0; 564 else 565 return *(__fs32 *)p == 0; 566 } 567