fs/ufs/util.h

   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_addr ubh_get_addr8
 309
 310 #define ubh_blkmap(ubh,begin,bit) \
 311         ((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
 312
 313 /*
 314  * Determine the number of available frags given a
 315  * percentage to hold in reserve.
 316  */
 317 static inline u64
 318 ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved)
 319 {
 320         return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
 321                 uspi->cs_total.cs_nffree -
 322                 (uspi->s_dsize * (percentreserved) / 100);
 323 }
 324
 325 /*
 326  * Macros to access cylinder group array structures
 327  */
 328 #define ubh_cg_blktot(ucpi,cylno) \
 329         (*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
 330
 331 #define ubh_cg_blks(ucpi,cylno,rpos) \
 332         (*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
 333         (ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
 334
 335 /*
 336  * Bitmap operations
 337  * These functions work like classical bitmap operations.
 338  * The difference is that we don't have the whole bitmap
 339  * in one contiguous chunk of memory, but in several buffers.
 340  * The parameters of each function are super_block, ufs_buffer_head and
 341  * position of the beginning of the bitmap.
 342  */
 343 #define ubh_setbit(ubh,begin,bit) \
 344         (*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
 345
 346 #define ubh_clrbit(ubh,begin,bit) \
 347         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
 348
 349 #define ubh_isset(ubh,begin,bit) \
 350         (*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
 351
 352 #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
 353
 354 #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
 355
 356 #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
 357 static inline unsigned _ubh_find_next_zero_bit_(
 358         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 359         unsigned begin, unsigned size, unsigned offset)
 360 {
 361         unsigned base, count, pos;
 362
 363         size -= offset;
 364         begin <<= 3;
 365         offset += begin;
 366         base = offset >> uspi->s_bpfshift;
 367         offset &= uspi->s_bpfmask;
 368         for (;;) {
 369                 count = min_t(unsigned int, size + offset, uspi->s_bpf);
 370                 size -= count - offset;
 371                 pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
 372                 if (pos < count || !size)
 373                         break;
 374                 base++;
 375                 offset = 0;
 376         }
 377         return (base << uspi->s_bpfshift) + pos - begin;
 378 }
 379
 380 static inline unsigned find_last_zero_bit (unsigned char * bitmap,
 381         unsigned size, unsigned offset)
 382 {
 383         unsigned bit, i;
 384         unsigned char * mapp;
 385         unsigned char map;
 386
 387         mapp = bitmap + (size >> 3);
 388         map = *mapp--;
 389         bit = 1 << (size & 7);
 390         for (i = size; i > offset; i--) {
 391                 if ((map & bit) == 0)
 392                         break;
 393                 if ((i & 7) != 0) {
 394                         bit >>= 1;
 395                 } else {
 396                         map = *mapp--;
 397                         bit = 1 << 7;
 398                 }
 399         }
 400         return i;
 401 }
 402
 403 #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
 404 static inline unsigned _ubh_find_last_zero_bit_(
 405         struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
 406         unsigned begin, unsigned start, unsigned end)
 407 {
 408         unsigned base, count, pos, size;
 409
 410         size = start - end;
 411         begin <<= 3;
 412         start += begin;
 413         base = start >> uspi->s_bpfshift;
 414         start &= uspi->s_bpfmask;
 415         for (;;) {
 416                 count = min_t(unsigned int,
 417                             size + (uspi->s_bpf - start), uspi->s_bpf)
 418                         - (uspi->s_bpf - start);
 419                 size -= count;
 420                 pos = find_last_zero_bit (ubh->bh[base]->b_data,
 421                         start, start - count);
 422                 if (pos > start - count || !size)
 423                         break;
 424                 base--;
 425                 start = uspi->s_bpf;
 426         }
 427         return (base << uspi->s_bpfshift) + pos - begin;
 428 }
 429
 430 #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
 431
 432 #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
 433 static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
 434         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 435 {
 436         switch (uspi->s_fpb) {
 437         case 8:
 438                 return (*ubh_get_addr (ubh, begin + block) == 0xff);
 439         case 4:
 440                 return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
 441         case 2:
 442                 return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
 443         case 1:
 444                 return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
 445         }
 446         return 0;
 447 }
 448
 449 #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
 450 static inline void _ubh_clrblock_(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                 *ubh_get_addr (ubh, begin + block) = 0x00;
 456                 return;
 457         case 4:
 458                 *ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
 459                 return;
 460         case 2:
 461                 *ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
 462                 return;
 463         case 1:
 464                 *ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
 465                 return;
 466         }
 467 }
 468
 469 #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
 470 static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
 471         struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
 472 {
 473         switch (uspi->s_fpb) {
 474         case 8:
 475                 *ubh_get_addr(ubh, begin + block) = 0xff;
 476                 return;
 477         case 4:
 478                 *ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
 479                 return;
 480         case 2:
 481                 *ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
 482                 return;
 483         case 1:
 484                 *ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
 485                 return;
 486         }
 487 }
 488
 489 static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
 490         __fs32 * fraglist, int cnt)
 491 {
 492         struct ufs_sb_private_info * uspi;
 493         unsigned fragsize, pos;
 494
 495         uspi = UFS_SB(sb)->s_uspi;
 496
 497         fragsize = 0;
 498         for (pos = 0; pos < uspi->s_fpb; pos++) {
 499                 if (blockmap & (1 << pos)) {
 500                         fragsize++;
 501                 }
 502                 else if (fragsize > 0) {
 503                         fs32_add(sb, &fraglist[fragsize], cnt);
 504                         fragsize = 0;
 505                 }
 506         }
 507         if (fragsize > 0 && fragsize < uspi->s_fpb)
 508                 fs32_add(sb, &fraglist[fragsize], cnt);
 509 }