fs/ufs/inode.c

   1 /*
   2  *  linux/fs/ufs/inode.c
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  *
   8  *  from
   9  *
  10  *  linux/fs/ext2/inode.c
  11  *
  12  * Copyright (C) 1992, 1993, 1994, 1995
  13  * Remy Card (card@masi.ibp.fr)
  14  * Laboratoire MASI - Institut Blaise Pascal
  15  * Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *  from
  18  *
  19  *  linux/fs/minix/inode.c
  20  *
  21  *  Copyright (C) 1991, 1992  Linus Torvalds
  22  *
  23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  24  *  Big-endian to little-endian byte-swapping/bitmaps by
  25  *        David S. Miller (davem@caip.rutgers.edu), 1995
  26  */
  27
  28 #include <asm/uaccess.h>
  29
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/time.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38
  39 #include "ufs_fs.h"
  40 #include "ufs.h"
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock);
  45
  46 static int ufs_block_to_path(struct inode *inode, sector_t i_block, sector_t offsets[4])
  47 {
  48         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  49         int ptrs = uspi->s_apb;
  50         int ptrs_bits = uspi->s_apbshift;
  51         const long direct_blocks = UFS_NDADDR,
  52                 indirect_blocks = ptrs,
  53                 double_blocks = (1 << (ptrs_bits * 2));
  54         int n = 0;
  55
  56
  57         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  58         if (i_block < direct_blocks) {
  59                 offsets[n++] = i_block;
  60         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  61                 offsets[n++] = UFS_IND_BLOCK;
  62                 offsets[n++] = i_block;
  63         } else if ((i_block -= indirect_blocks) < double_blocks) {
  64                 offsets[n++] = UFS_DIND_BLOCK;
  65                 offsets[n++] = i_block >> ptrs_bits;
  66                 offsets[n++] = i_block & (ptrs - 1);
  67         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  68                 offsets[n++] = UFS_TIND_BLOCK;
  69                 offsets[n++] = i_block >> (ptrs_bits * 2);
  70                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  71                 offsets[n++] = i_block & (ptrs - 1);
  72         } else {
  73                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  74         }
  75         return n;
  76 }
  77
  78 /*
  79  * Returns the location of the fragment from
  80  * the beginning of the filesystem.
  81  */
  82
  83 static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock)
  84 {
  85         struct ufs_inode_info *ufsi = UFS_I(inode);
  86         struct super_block *sb = inode->i_sb;
  87         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
  88         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
  89         int shift = uspi->s_apbshift-uspi->s_fpbshift;
  90         sector_t offsets[4], *p;
  91         int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
  92         u64  ret = 0L;
  93         __fs32 block;
  94         __fs64 u2_block = 0L;
  95         unsigned flags = UFS_SB(sb)->s_flags;
  96         u64 temp = 0L;
  97
  98         UFSD(": frag = %llu  depth = %d\n", (unsigned long long)frag, depth);
  99         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 100                 uspi->s_fpbshift, uspi->s_apbmask,
 101                 (unsigned long long)mask);
 102
 103         if (depth == 0)
 104                 return 0;
 105
 106         p = offsets;
 107
 108         if (needs_lock)
 109                 lock_ufs(sb);
 110         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 111                 goto ufs2;
 112
 113         block = ufsi->i_u1.i_data[*p++];
 114         if (!block)
 115                 goto out;
 116         while (--depth) {
 117                 struct buffer_head *bh;
 118                 sector_t n = *p++;
 119
 120                 bh = sb_bread(sb, uspi->s_sbbase + fs32_to_cpu(sb, block)+(n>>shift));
 121                 if (!bh)
 122                         goto out;
 123                 block = ((__fs32 *) bh->b_data)[n & mask];
 124                 brelse (bh);
 125                 if (!block)
 126                         goto out;
 127         }
 128         ret = (u64) (uspi->s_sbbase + fs32_to_cpu(sb, block) + (frag & uspi->s_fpbmask));
 129         goto out;
 130 ufs2:
 131         u2_block = ufsi->i_u1.u2_i_data[*p++];
 132         if (!u2_block)
 133                 goto out;
 134
 135
 136         while (--depth) {
 137                 struct buffer_head *bh;
 138                 sector_t n = *p++;
 139
 140
 141                 temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
 142                 bh = sb_bread(sb, temp +(u64) (n>>shift));
 143                 if (!bh)
 144                         goto out;
 145                 u2_block = ((__fs64 *)bh->b_data)[n & mask];
 146                 brelse(bh);
 147                 if (!u2_block)
 148                         goto out;
 149         }
 150         temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
 151         ret = temp + (u64) (frag & uspi->s_fpbmask);
 152
 153 out:
 154         if (needs_lock)
 155                 unlock_ufs(sb);
 156         return ret;
 157 }
 158
 159 /**
 160  * ufs_inode_getfrag() - allocate new fragment(s)
 161  * @inode - pointer to inode
 162  * @fragment - number of `fragment' which hold pointer
 163  *   to new allocated fragment(s)
 164  * @new_fragment - number of new allocated fragment(s)
 165  * @required - how many fragment(s) we require
 166  * @err - we set it if something wrong
 167  * @phys - pointer to where we save physical number of new allocated fragments,
 168  *   NULL if we allocate not data(indirect blocks for example).
 169  * @new - we set it if we allocate new block
 170  * @locked_page - for ufs_new_fragments()
 171  */
 172 static struct buffer_head *
 173 ufs_inode_getfrag(struct inode *inode, u64 fragment,
 174                   sector_t new_fragment, unsigned int required, int *err,
 175                   long *phys, int *new, struct page *locked_page)
 176 {
 177         struct ufs_inode_info *ufsi = UFS_I(inode);
 178         struct super_block *sb = inode->i_sb;
 179         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 180         struct buffer_head * result;
 181         unsigned blockoff, lastblockoff;
 182         u64 tmp, goal, lastfrag, block, lastblock;
 183         void *p, *p2;
 184
 185         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
 186              "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
 187              (unsigned long long)new_fragment, required, !phys);
 188
 189         /* TODO : to be done for write support
 190         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 191              goto ufs2;
 192          */
 193
 194         block = ufs_fragstoblks (fragment);
 195         blockoff = ufs_fragnum (fragment);
 196         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 197
 198         goal = 0;
 199
 200 repeat:
 201         tmp = ufs_data_ptr_to_cpu(sb, p);
 202
 203         lastfrag = ufsi->i_lastfrag;
 204         if (tmp && fragment < lastfrag) {
 205                 if (!phys) {
 206                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 207                         if (tmp == ufs_data_ptr_to_cpu(sb, p)) {
 208                                 UFSD("EXIT, result %llu\n",
 209                                      (unsigned long long)tmp + blockoff);
 210                                 return result;
 211                         }
 212                         brelse (result);
 213                         goto repeat;
 214                 } else {
 215                         *phys = uspi->s_sbbase + tmp + blockoff;
 216                         return NULL;
 217                 }
 218         }
 219
 220         lastblock = ufs_fragstoblks (lastfrag);
 221         lastblockoff = ufs_fragnum (lastfrag);
 222         /*
 223          * We will extend file into new block beyond last allocated block
 224          */
 225         if (lastblock < block) {
 226                 /*
 227                  * We must reallocate last allocated block
 228                  */
 229                 if (lastblockoff) {
 230                         p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
 231                         tmp = ufs_new_fragments(inode, p2, lastfrag,
 232                                                 ufs_data_ptr_to_cpu(sb, p2),
 233                                                 uspi->s_fpb - lastblockoff,
 234                                                 err, locked_page);
 235                         if (!tmp) {
 236                                 if (lastfrag != ufsi->i_lastfrag)
 237                                         goto repeat;
 238                                 else
 239                                         return NULL;
 240                         }
 241                         lastfrag = ufsi->i_lastfrag;
 242
 243                 }
 244                 tmp = ufs_data_ptr_to_cpu(sb,
 245                                          ufs_get_direct_data_ptr(uspi, ufsi,
 246                                                                  lastblock));
 247                 if (tmp)
 248                         goal = tmp + uspi->s_fpb;
 249                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 250                                          goal, required + blockoff,
 251                                          err,
 252                                          phys != NULL ? locked_page : NULL);
 253         } else if (lastblock == block) {
 254         /*
 255          * We will extend last allocated block
 256          */
 257                 tmp = ufs_new_fragments(inode, p, fragment -
 258                                         (blockoff - lastblockoff),
 259                                         ufs_data_ptr_to_cpu(sb, p),
 260                                         required +  (blockoff - lastblockoff),
 261                                         err, phys != NULL ? locked_page : NULL);
 262         } else /* (lastblock > block) */ {
 263         /*
 264          * We will allocate new block before last allocated block
 265          */
 266                 if (block) {
 267                         tmp = ufs_data_ptr_to_cpu(sb,
 268                                                  ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
 269                         if (tmp)
 270                                 goal = tmp + uspi->s_fpb;
 271                 }
 272                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 273                                         goal, uspi->s_fpb, err,
 274                                         phys != NULL ? locked_page : NULL);
 275         }
 276         if (!tmp) {
 277                 if ((!blockoff && ufs_data_ptr_to_cpu(sb, p)) ||
 278                     (blockoff && lastfrag != ufsi->i_lastfrag))
 279                         goto repeat;
 280                 *err = -ENOSPC;
 281                 return NULL;
 282         }
 283
 284         if (!phys) {
 285                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 286         } else {
 287                 *phys = uspi->s_sbbase + tmp + blockoff;
 288                 result = NULL;
 289                 *err = 0;
 290                 *new = 1;
 291         }
 292
 293         inode->i_ctime = CURRENT_TIME_SEC;
 294         if (IS_SYNC(inode))
 295                 ufs_sync_inode (inode);
 296         mark_inode_dirty(inode);
 297         UFSD("EXIT, result %llu\n", (unsigned long long)tmp + blockoff);
 298         return result;
 299
 300      /* This part : To be implemented ....
 301         Required only for writing, not required for READ-ONLY.
 302 ufs2:
 303
 304         u2_block = ufs_fragstoblks(fragment);
 305         u2_blockoff = ufs_fragnum(fragment);
 306         p = ufsi->i_u1.u2_i_data + block;
 307         goal = 0;
 308
 309 repeat2:
 310         tmp = fs32_to_cpu(sb, *p);
 311         lastfrag = ufsi->i_lastfrag;
 312
 313      */
 314 }
 315
 316 /**
 317  * ufs_inode_getblock() - allocate new block
 318  * @inode - pointer to inode
 319  * @bh - pointer to block which hold "pointer" to new allocated block
 320  * @fragment - number of `fragment' which hold pointer
 321  *   to new allocated block
 322  * @new_fragment - number of new allocated fragment
 323  *  (block will hold this fragment and also uspi->s_fpb-1)
 324  * @err - see ufs_inode_getfrag()
 325  * @phys - see ufs_inode_getfrag()
 326  * @new - see ufs_inode_getfrag()
 327  * @locked_page - see ufs_inode_getfrag()
 328  */
 329 static struct buffer_head *
 330 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 331                   u64 fragment, sector_t new_fragment, int *err,
 332                   long *phys, int *new, struct page *locked_page)
 333 {
 334         struct super_block *sb = inode->i_sb;
 335         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 336         struct buffer_head * result;
 337         unsigned blockoff;
 338         u64 tmp, goal, block;
 339         void *p;
 340
 341         block = ufs_fragstoblks (fragment);
 342         blockoff = ufs_fragnum (fragment);
 343
 344         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, metadata %d\n",
 345              inode->i_ino, (unsigned long long)fragment,
 346              (unsigned long long)new_fragment, !phys);
 347
 348         result = NULL;
 349         if (!bh)
 350                 goto out;
 351         if (!buffer_uptodate(bh)) {
 352                 ll_rw_block (READ, 1, &bh);
 353                 wait_on_buffer (bh);
 354                 if (!buffer_uptodate(bh))
 355                         goto out;
 356         }
 357         if (uspi->fs_magic == UFS2_MAGIC)
 358                 p = (__fs64 *)bh->b_data + block;
 359         else
 360                 p = (__fs32 *)bh->b_data + block;
 361 repeat:
 362         tmp = ufs_data_ptr_to_cpu(sb, p);
 363         if (tmp) {
 364                 if (!phys) {
 365                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 366                         if (tmp == ufs_data_ptr_to_cpu(sb, p))
 367                                 goto out;
 368                         brelse (result);
 369                         goto repeat;
 370                 } else {
 371                         *phys = uspi->s_sbbase + tmp + blockoff;
 372                         goto out;
 373                 }
 374         }
 375
 376         if (block && (uspi->fs_magic == UFS2_MAGIC ?
 377                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[block-1])) :
 378                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[block-1]))))
 379                 goal = tmp + uspi->s_fpb;
 380         else
 381                 goal = bh->b_blocknr + uspi->s_fpb;
 382         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 383                                 uspi->s_fpb, err, locked_page);
 384         if (!tmp) {
 385                 if (ufs_data_ptr_to_cpu(sb, p))
 386                         goto repeat;
 387                 goto out;
 388         }
 389
 390
 391         if (!phys) {
 392                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 393         } else {
 394                 *phys = uspi->s_sbbase + tmp + blockoff;
 395                 *new = 1;
 396         }
 397
 398         mark_buffer_dirty(bh);
 399         if (IS_SYNC(inode))
 400                 sync_dirty_buffer(bh);
 401         inode->i_ctime = CURRENT_TIME_SEC;
 402         mark_inode_dirty(inode);
 403         UFSD("result %llu\n", (unsigned long long)tmp + blockoff);
 404 out:
 405         brelse (bh);
 406         UFSD("EXIT\n");
 407         return result;
 408 }
 409
 410 /**
 411  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 412  * readpage, writepage and so on
 413  */
 414
 415 int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 416 {
 417         struct super_block * sb = inode->i_sb;
 418         struct ufs_sb_info * sbi = UFS_SB(sb);
 419         struct ufs_sb_private_info * uspi = sbi->s_uspi;
 420         struct buffer_head * bh;
 421         int ret, err, new;
 422         unsigned long ptr,phys;
 423         u64 phys64 = 0;
 424         bool needs_lock = (sbi->mutex_owner != current);
 425
 426         if (!create) {
 427                 phys64 = ufs_frag_map(inode, fragment, needs_lock);
 428                 UFSD("phys64 = %llu\n", (unsigned long long)phys64);
 429                 if (phys64)
 430                         map_bh(bh_result, sb, phys64);
 431                 return 0;
 432         }
 433
 434         /* This code entered only while writing ....? */
 435
 436         err = -EIO;
 437         new = 0;
 438         ret = 0;
 439         bh = NULL;
 440
 441         if (needs_lock)
 442                 lock_ufs(sb);
 443
 444         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 445         if (fragment >
 446             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
 447              << uspi->s_fpbshift))
 448                 goto abort_too_big;
 449
 450         err = 0;
 451         ptr = fragment;
 452
 453         /*
 454          * ok, these macros clean the logic up a bit and make
 455          * it much more readable:
 456          */
 457 #define GET_INODE_DATABLOCK(x) \
 458         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new,\
 459                           bh_result->b_page)
 460 #define GET_INODE_PTR(x) \
 461         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL,\
 462                           bh_result->b_page)
 463 #define GET_INDIRECT_DATABLOCK(x) \
 464         ufs_inode_getblock(inode, bh, x, fragment,      \
 465                           &err, &phys, &new, bh_result->b_page)
 466 #define GET_INDIRECT_PTR(x) \
 467         ufs_inode_getblock(inode, bh, x, fragment,      \
 468                           &err, NULL, NULL, NULL)
 469
 470         if (ptr < UFS_NDIR_FRAGMENT) {
 471                 bh = GET_INODE_DATABLOCK(ptr);
 472                 goto out;
 473         }
 474         ptr -= UFS_NDIR_FRAGMENT;
 475         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
 476                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
 477                 goto get_indirect;
 478         }
 479         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 480         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
 481                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
 482                 goto get_double;
 483         }
 484         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 485         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
 486         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
 487 get_double:
 488         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 489 get_indirect:
 490         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
 491
 492 #undef GET_INODE_DATABLOCK
 493 #undef GET_INODE_PTR
 494 #undef GET_INDIRECT_DATABLOCK
 495 #undef GET_INDIRECT_PTR
 496
 497 out:
 498         if (err)
 499                 goto abort;
 500         if (new)
 501                 set_buffer_new(bh_result);
 502         map_bh(bh_result, sb, phys);
 503 abort:
 504         if (needs_lock)
 505                 unlock_ufs(sb);
 506
 507         return err;
 508
 509 abort_too_big:
 510         ufs_warning(sb, "ufs_get_block", "block > big");
 511         goto abort;
 512 }
 513
 514 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 515 {
 516         return block_write_full_page(page,ufs_getfrag_block,wbc);
 517 }
 518
 519 static int ufs_readpage(struct file *file, struct page *page)
 520 {
 521         return block_read_full_page(page,ufs_getfrag_block);
 522 }
 523
 524 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 525 {
 526         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 527 }
 528
 529 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 530                         loff_t pos, unsigned len, unsigned flags,
 531                         struct page **pagep, void **fsdata)
 532 {
 533         int ret;
 534
 535         ret = block_write_begin(mapping, pos, len, flags, pagep,
 536                                 ufs_getfrag_block);
 537         if (unlikely(ret)) {
 538                 loff_t isize = mapping->host->i_size;
 539                 if (pos + len > isize)
 540                         vmtruncate(mapping->host, isize);
 541         }
 542
 543         return ret;
 544 }
 545
 546 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 547 {
 548         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 549 }
 550
 551 const struct address_space_operations ufs_aops = {
 552         .readpage = ufs_readpage,
 553         .writepage = ufs_writepage,
 554         .write_begin = ufs_write_begin,
 555         .write_end = generic_write_end,
 556         .bmap = ufs_bmap
 557 };
 558
 559 static void ufs_set_inode_ops(struct inode *inode)
 560 {
 561         if (S_ISREG(inode->i_mode)) {
 562                 inode->i_op = &ufs_file_inode_operations;
 563                 inode->i_fop = &ufs_file_operations;
 564                 inode->i_mapping->a_ops = &ufs_aops;
 565         } else if (S_ISDIR(inode->i_mode)) {
 566                 inode->i_op = &ufs_dir_inode_operations;
 567                 inode->i_fop = &ufs_dir_operations;
 568                 inode->i_mapping->a_ops = &ufs_aops;
 569         } else if (S_ISLNK(inode->i_mode)) {
 570                 if (!inode->i_blocks)
 571                         inode->i_op = &ufs_fast_symlink_inode_operations;
 572                 else {
 573                         inode->i_op = &ufs_symlink_inode_operations;
 574                         inode->i_mapping->a_ops = &ufs_aops;
 575                 }
 576         } else
 577                 init_special_inode(inode, inode->i_mode,
 578                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 579 }
 580
 581 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 582 {
 583         struct ufs_inode_info *ufsi = UFS_I(inode);
 584         struct super_block *sb = inode->i_sb;
 585         umode_t mode;
 586
 587         /*
 588          * Copy data to the in-core inode.
 589          */
 590         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 591         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 592         if (inode->i_nlink == 0) {
 593                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 594                 return -1;
 595         }
 596
 597         /*
 598          * Linux now has 32-bit uid and gid, so we can support EFT.
 599          */
 600         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 601         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 602
 603         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 604         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 605         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 606         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 607         inode->i_mtime.tv_nsec = 0;
 608         inode->i_atime.tv_nsec = 0;
 609         inode->i_ctime.tv_nsec = 0;
 610         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 611         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 612         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 613         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 614         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 615
 616
 617         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 618                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 619                        sizeof(ufs_inode->ui_u2.ui_addr));
 620         } else {
 621                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 622                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 623                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 624         }
 625         return 0;
 626 }
 627
 628 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 629 {
 630         struct ufs_inode_info *ufsi = UFS_I(inode);
 631         struct super_block *sb = inode->i_sb;
 632         umode_t mode;
 633
 634         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 635         /*
 636          * Copy data to the in-core inode.
 637          */
 638         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 639         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 640         if (inode->i_nlink == 0) {
 641                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 642                 return -1;
 643         }
 644
 645         /*
 646          * Linux now has 32-bit uid and gid, so we can support EFT.
 647          */
 648         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 649         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 650
 651         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 652         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 653         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 654         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 655         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 656         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 657         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 658         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 659         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 660         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 661         /*
 662         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 663         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 664         */
 665
 666         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 667                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 668                        sizeof(ufs2_inode->ui_u2.ui_addr));
 669         } else {
 670                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 671                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 672                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 673         }
 674         return 0;
 675 }
 676
 677 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 678 {
 679         struct ufs_inode_info *ufsi;
 680         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 681         struct buffer_head * bh;
 682         struct inode *inode;
 683         int err;
 684
 685         UFSD("ENTER, ino %lu\n", ino);
 686
 687         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 688                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 689                             ino);
 690                 return ERR_PTR(-EIO);
 691         }
 692
 693         inode = iget_locked(sb, ino);
 694         if (!inode)
 695                 return ERR_PTR(-ENOMEM);
 696         if (!(inode->i_state & I_NEW))
 697                 return inode;
 698
 699         ufsi = UFS_I(inode);
 700
 701         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 702         if (!bh) {
 703                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 704                             inode->i_ino);
 705                 goto bad_inode;
 706         }
 707         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 708                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 709
 710                 err = ufs2_read_inode(inode,
 711                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 712         } else {
 713                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 714
 715                 err = ufs1_read_inode(inode,
 716                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 717         }
 718
 719         if (err)
 720                 goto bad_inode;
 721         inode->i_version++;
 722         ufsi->i_lastfrag =
 723                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 724         ufsi->i_dir_start_lookup = 0;
 725         ufsi->i_osync = 0;
 726
 727         ufs_set_inode_ops(inode);
 728
 729         brelse(bh);
 730
 731         UFSD("EXIT\n");
 732         unlock_new_inode(inode);
 733         return inode;
 734
 735 bad_inode:
 736         iget_failed(inode);
 737         return ERR_PTR(-EIO);
 738 }
 739
 740 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 741 {
 742         struct super_block *sb = inode->i_sb;
 743         struct ufs_inode_info *ufsi = UFS_I(inode);
 744
 745         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 746         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 747
 748         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 749         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 750
 751         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 752         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 753         ufs_inode->ui_atime.tv_usec = 0;
 754         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 755         ufs_inode->ui_ctime.tv_usec = 0;
 756         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 757         ufs_inode->ui_mtime.tv_usec = 0;
 758         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 759         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 760         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 761
 762         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 763                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 764                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 765         }
 766
 767         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 768                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 769                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 770         } else if (inode->i_blocks) {
 771                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 772                        sizeof(ufs_inode->ui_u2.ui_addr));
 773         }
 774         else {
 775                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 776                        sizeof(ufs_inode->ui_u2.ui_symlink));
 777         }
 778
 779         if (!inode->i_nlink)
 780                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 781 }
 782
 783 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 784 {
 785         struct super_block *sb = inode->i_sb;
 786         struct ufs_inode_info *ufsi = UFS_I(inode);
 787
 788         UFSD("ENTER\n");
 789         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 790         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 791
 792         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 793         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 794
 795         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 796         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 797         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 798         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 799         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 800         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 801         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 802
 803         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 804         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 805         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 806
 807         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 808                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 809                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 810         } else if (inode->i_blocks) {
 811                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 812                        sizeof(ufs_inode->ui_u2.ui_addr));
 813         } else {
 814                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 815                        sizeof(ufs_inode->ui_u2.ui_symlink));
 816         }
 817
 818         if (!inode->i_nlink)
 819                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 820         UFSD("EXIT\n");
 821 }
 822
 823 static int ufs_update_inode(struct inode * inode, int do_sync)
 824 {
 825         struct super_block *sb = inode->i_sb;
 826         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 827         struct buffer_head * bh;
 828
 829         UFSD("ENTER, ino %lu\n", inode->i_ino);
 830
 831         if (inode->i_ino < UFS_ROOTINO ||
 832             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 833                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 834                 return -1;
 835         }
 836
 837         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 838         if (!bh) {
 839                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 840                 return -1;
 841         }
 842         if (uspi->fs_magic == UFS2_MAGIC) {
 843                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 844
 845                 ufs2_update_inode(inode,
 846                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 847         } else {
 848                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 849
 850                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 851         }
 852
 853         mark_buffer_dirty(bh);
 854         if (do_sync)
 855                 sync_dirty_buffer(bh);
 856         brelse (bh);
 857
 858         UFSD("EXIT\n");
 859         return 0;
 860 }
 861
 862 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 863 {
 864         int ret;
 865         lock_ufs(inode->i_sb);
 866         ret = ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 867         unlock_ufs(inode->i_sb);
 868         return ret;
 869 }
 870
 871 int ufs_sync_inode (struct inode *inode)
 872 {
 873         return ufs_update_inode (inode, 1);
 874 }
 875
 876 void ufs_evict_inode(struct inode * inode)
 877 {
 878         int want_delete = 0;
 879
 880         if (!inode->i_nlink && !is_bad_inode(inode))
 881                 want_delete = 1;
 882
 883         truncate_inode_pages(&inode->i_data, 0);
 884         if (want_delete) {
 885                 loff_t old_i_size;
 886                 /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
 887                 lock_ufs(inode->i_sb);
 888                 mark_inode_dirty(inode);
 889                 ufs_update_inode(inode, IS_SYNC(inode));
 890                 old_i_size = inode->i_size;
 891                 inode->i_size = 0;
 892                 if (inode->i_blocks && ufs_truncate(inode, old_i_size))
 893                         ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
 894                 unlock_ufs(inode->i_sb);
 895         }
 896
 897         invalidate_inode_buffers(inode);
 898         clear_inode(inode);
 899
 900         if (want_delete) {
 901                 lock_ufs(inode->i_sb);
 902                 ufs_free_inode (inode);
 903                 unlock_ufs(inode->i_sb);
 904         }
 905 }