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 extern int __ufs_write_begin(struct file *file, struct address_space *mapping, 235 loff_t pos, unsigned len, unsigned flags, 236 struct page **pagep, void **fsdata); 237 238 /* 239 * These functions manipulate ufs buffers 240 */ 241 #define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size) 242 extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64); 243 extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64); 244 extern void ubh_brelse (struct ufs_buffer_head *); 245 extern void ubh_brelse_uspi (struct ufs_sb_private_info *); 246 extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *); 247 extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int); 248 extern void ubh_ll_rw_block(int, struct ufs_buffer_head *); 249 extern void ubh_wait_on_buffer (struct ufs_buffer_head *); 250 extern void ubh_bforget (struct ufs_buffer_head *); 251 extern int ubh_buffer_dirty (struct ufs_buffer_head *); 252 #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size) 253 extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned); 254 #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size) 255 extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned); 256 257 /* This functions works with cache pages*/ 258 extern struct page *ufs_get_locked_page(struct address_space *mapping, 259 pgoff_t index); 260 static inline void ufs_put_locked_page(struct page *page) 261 { 262 unlock_page(page); 263 page_cache_release(page); 264 } 265 266 267 /* 268 * macros and inline function to get important structures from ufs_sb_private_info 269 */ 270 271 static inline void *get_usb_offset(struct ufs_sb_private_info *uspi, 272 unsigned int offset) 273 { 274 unsigned int index; 275 276 index = offset >> uspi->s_fshift; 277 offset &= ~uspi->s_fmask; 278 return uspi->s_ubh.bh[index]->b_data + offset; 279 } 280 281 #define ubh_get_usb_first(uspi) \ 282 ((struct ufs_super_block_first *)get_usb_offset((uspi), 0)) 283 284 #define ubh_get_usb_second(uspi) \ 285 ((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE)) 286 287 #define ubh_get_usb_third(uspi) \ 288 ((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE)) 289 290 291 #define ubh_get_ucg(ubh) \ 292 ((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data)) 293 294 295 /* 296 * Extract byte from ufs_buffer_head 297 * Extract the bits for a block from a map inside ufs_buffer_head 298 */ 299 #define ubh_get_addr8(ubh,begin) \ 300 ((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \ 301 ((begin) & ~uspi->s_fmask)) 302 303 #define ubh_get_addr16(ubh,begin) \ 304 (((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \ 305 ((begin) & ((uspi->fsize>>1) - 1))) 306 307 #define ubh_get_addr32(ubh,begin) \ 308 (((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \ 309 ((begin) & ((uspi->s_fsize>>2) - 1))) 310 311 #define ubh_get_addr64(ubh,begin) \ 312 (((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \ 313 ((begin) & ((uspi->s_fsize>>3) - 1))) 314 315 #define ubh_get_addr ubh_get_addr8 316 317 static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi, 318 struct ufs_buffer_head *ubh, 319 u64 blk) 320 { 321 if (uspi->fs_magic == UFS2_MAGIC) 322 return ubh_get_addr64(ubh, blk); 323 else 324 return ubh_get_addr32(ubh, blk); 325 } 326 327 #define ubh_blkmap(ubh,begin,bit) \ 328 ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb))) 329 330 /* 331 * Determine the number of available frags given a 332 * percentage to hold in reserve. 333 */ 334 static inline u64 335 ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved) 336 { 337 return ufs_blkstofrags(uspi->cs_total.cs_nbfree) + 338 uspi->cs_total.cs_nffree - 339 (uspi->s_dsize * (percentreserved) / 100); 340 } 341 342 /* 343 * Macros to access cylinder group array structures 344 */ 345 #define ubh_cg_blktot(ucpi,cylno) \ 346 (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2)))) 347 348 #define ubh_cg_blks(ucpi,cylno,rpos) \ 349 (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \ 350 (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 )))) 351 352 /* 353 * Bitmap operations 354 * These functions work like classical bitmap operations. 355 * The difference is that we don't have the whole bitmap 356 * in one contiguous chunk of memory, but in several buffers. 357 * The parameters of each function are super_block, ufs_buffer_head and 358 * position of the beginning of the bitmap. 359 */ 360 #define ubh_setbit(ubh,begin,bit) \ 361 (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7))) 362 363 #define ubh_clrbit(ubh,begin,bit) \ 364 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7))) 365 366 #define ubh_isset(ubh,begin,bit) \ 367 (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7))) 368 369 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit)) 370 371 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0) 372 373 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset) 374 static inline unsigned _ubh_find_next_zero_bit_( 375 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 376 unsigned begin, unsigned size, unsigned offset) 377 { 378 unsigned base, count, pos; 379 380 size -= offset; 381 begin <<= 3; 382 offset += begin; 383 base = offset >> uspi->s_bpfshift; 384 offset &= uspi->s_bpfmask; 385 for (;;) { 386 count = min_t(unsigned int, size + offset, uspi->s_bpf); 387 size -= count - offset; 388 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset); 389 if (pos < count || !size) 390 break; 391 base++; 392 offset = 0; 393 } 394 return (base << uspi->s_bpfshift) + pos - begin; 395 } 396 397 static inline unsigned find_last_zero_bit (unsigned char * bitmap, 398 unsigned size, unsigned offset) 399 { 400 unsigned bit, i; 401 unsigned char * mapp; 402 unsigned char map; 403 404 mapp = bitmap + (size >> 3); 405 map = *mapp--; 406 bit = 1 << (size & 7); 407 for (i = size; i > offset; i--) { 408 if ((map & bit) == 0) 409 break; 410 if ((i & 7) != 0) { 411 bit >>= 1; 412 } else { 413 map = *mapp--; 414 bit = 1 << 7; 415 } 416 } 417 return i; 418 } 419 420 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset) 421 static inline unsigned _ubh_find_last_zero_bit_( 422 struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 423 unsigned begin, unsigned start, unsigned end) 424 { 425 unsigned base, count, pos, size; 426 427 size = start - end; 428 begin <<= 3; 429 start += begin; 430 base = start >> uspi->s_bpfshift; 431 start &= uspi->s_bpfmask; 432 for (;;) { 433 count = min_t(unsigned int, 434 size + (uspi->s_bpf - start), uspi->s_bpf) 435 - (uspi->s_bpf - start); 436 size -= count; 437 pos = find_last_zero_bit (ubh->bh[base]->b_data, 438 start, start - count); 439 if (pos > start - count || !size) 440 break; 441 base--; 442 start = uspi->s_bpf; 443 } 444 return (base << uspi->s_bpfshift) + pos - begin; 445 } 446 447 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block)) 448 449 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block) 450 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi, 451 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 452 { 453 switch (uspi->s_fpb) { 454 case 8: 455 return (*ubh_get_addr (ubh, begin + block) == 0xff); 456 case 4: 457 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2))); 458 case 2: 459 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1))); 460 case 1: 461 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07))); 462 } 463 return 0; 464 } 465 466 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block) 467 static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi, 468 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 469 { 470 switch (uspi->s_fpb) { 471 case 8: 472 *ubh_get_addr (ubh, begin + block) = 0x00; 473 return; 474 case 4: 475 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2)); 476 return; 477 case 2: 478 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1)); 479 return; 480 case 1: 481 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07))); 482 return; 483 } 484 } 485 486 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block) 487 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi, 488 struct ufs_buffer_head * ubh, unsigned begin, unsigned block) 489 { 490 switch (uspi->s_fpb) { 491 case 8: 492 *ubh_get_addr(ubh, begin + block) = 0xff; 493 return; 494 case 4: 495 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2)); 496 return; 497 case 2: 498 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1)); 499 return; 500 case 1: 501 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07))); 502 return; 503 } 504 } 505 506 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap, 507 __fs32 * fraglist, int cnt) 508 { 509 struct ufs_sb_private_info * uspi; 510 unsigned fragsize, pos; 511 512 uspi = UFS_SB(sb)->s_uspi; 513 514 fragsize = 0; 515 for (pos = 0; pos < uspi->s_fpb; pos++) { 516 if (blockmap & (1 << pos)) { 517 fragsize++; 518 } 519 else if (fragsize > 0) { 520 fs32_add(sb, &fraglist[fragsize], cnt); 521 fragsize = 0; 522 } 523 } 524 if (fragsize > 0 && fragsize < uspi->s_fpb) 525 fs32_add(sb, &fraglist[fragsize], cnt); 526 } 527 528 static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi, 529 struct ufs_inode_info *ufsi, 530 unsigned blk) 531 { 532 BUG_ON(blk > UFS_TIND_BLOCK); 533 return uspi->fs_magic == UFS2_MAGIC ? 534 (void *)&ufsi->i_u1.u2_i_data[blk] : 535 (void *)&ufsi->i_u1.i_data[blk]; 536 } 537 538 static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p) 539 { 540 return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ? 541 fs64_to_cpu(sb, *(__fs64 *)p) : 542 fs32_to_cpu(sb, *(__fs32 *)p); 543 } 544 545 static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val) 546 { 547 if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC) 548 *(__fs64 *)p = cpu_to_fs64(sb, val); 549 else 550 *(__fs32 *)p = cpu_to_fs32(sb, val); 551 } 552 553 static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi, 554 void *p) 555 { 556 if (uspi->fs_magic == UFS2_MAGIC) 557 *(__fs64 *)p = 0; 558 else 559 *(__fs32 *)p = 0; 560 } 561 562 static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi, 563 void *p) 564 { 565 if (uspi->fs_magic == UFS2_MAGIC) 566 return *(__fs64 *)p == 0; 567 else 568 return *(__fs32 *)p == 0; 569 } 570