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 #include <asm/system.h>
  30
  31 #include <linux/errno.h>
  32 #include <linux/fs.h>
  33 #include <linux/time.h>
  34 #include <linux/stat.h>
  35 #include <linux/string.h>
  36 #include <linux/mm.h>
  37 #include <linux/smp_lock.h>
  38 #include <linux/buffer_head.h>
  39 #include <linux/writeback.h>
  40
  41 #include "ufs_fs.h"
  42 #include "ufs.h"
  43 #include "swab.h"
  44 #include "util.h"
  45
  46 static u64 ufs_frag_map(struct inode *inode, sector_t frag);
  47
  48 static int ufs_block_to_path(struct inode *inode, sector_t i_block, sector_t offsets[4])
  49 {
  50         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  51         int ptrs = uspi->s_apb;
  52         int ptrs_bits = uspi->s_apbshift;
  53         const long direct_blocks = UFS_NDADDR,
  54                 indirect_blocks = ptrs,
  55                 double_blocks = (1 << (ptrs_bits * 2));
  56         int n = 0;
  57
  58
  59         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  60         if (i_block < direct_blocks) {
  61                 offsets[n++] = i_block;
  62         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  63                 offsets[n++] = UFS_IND_BLOCK;
  64                 offsets[n++] = i_block;
  65         } else if ((i_block -= indirect_blocks) < double_blocks) {
  66                 offsets[n++] = UFS_DIND_BLOCK;
  67                 offsets[n++] = i_block >> ptrs_bits;
  68                 offsets[n++] = i_block & (ptrs - 1);
  69         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  70                 offsets[n++] = UFS_TIND_BLOCK;
  71                 offsets[n++] = i_block >> (ptrs_bits * 2);
  72                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  73                 offsets[n++] = i_block & (ptrs - 1);
  74         } else {
  75                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  76         }
  77         return n;
  78 }
  79
  80 /*
  81  * Returns the location of the fragment from
  82  * the begining of the filesystem.
  83  */
  84
  85 static u64 ufs_frag_map(struct inode *inode, sector_t frag)
  86 {
  87         struct ufs_inode_info *ufsi = UFS_I(inode);
  88         struct super_block *sb = inode->i_sb;
  89         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
  90         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
  91         int shift = uspi->s_apbshift-uspi->s_fpbshift;
  92         sector_t offsets[4], *p;
  93         int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
  94         u64  ret = 0L;
  95         __fs32 block;
  96         __fs64 u2_block = 0L;
  97         unsigned flags = UFS_SB(sb)->s_flags;
  98         u64 temp = 0L;
  99
 100         UFSD(": frag = %llu  depth = %d\n", (unsigned long long)frag, depth);
 101         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 102                 uspi->s_fpbshift, uspi->s_apbmask,
 103                 (unsigned long long)mask);
 104
 105         if (depth == 0)
 106                 return 0;
 107
 108         p = offsets;
 109
 110         lock_kernel();
 111         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 112                 goto ufs2;
 113
 114         block = ufsi->i_u1.i_data[*p++];
 115         if (!block)
 116                 goto out;
 117         while (--depth) {
 118                 struct buffer_head *bh;
 119                 sector_t n = *p++;
 120
 121                 bh = sb_bread(sb, uspi->s_sbbase + fs32_to_cpu(sb, block)+(n>>shift));
 122                 if (!bh)
 123                         goto out;
 124                 block = ((__fs32 *) bh->b_data)[n & mask];
 125                 brelse (bh);
 126                 if (!block)
 127                         goto out;
 128         }
 129         ret = (u64) (uspi->s_sbbase + fs32_to_cpu(sb, block) + (frag & uspi->s_fpbmask));
 130         goto out;
 131 ufs2:
 132         u2_block = ufsi->i_u1.u2_i_data[*p++];
 133         if (!u2_block)
 134                 goto out;
 135
 136
 137         while (--depth) {
 138                 struct buffer_head *bh;
 139                 sector_t n = *p++;
 140
 141
 142                 temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
 143                 bh = sb_bread(sb, temp +(u64) (n>>shift));
 144                 if (!bh)
 145                         goto out;
 146                 u2_block = ((__fs64 *)bh->b_data)[n & mask];
 147                 brelse(bh);
 148                 if (!u2_block)
 149                         goto out;
 150         }
 151         temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
 152         ret = temp + (u64) (frag & uspi->s_fpbmask);
 153
 154 out:
 155         unlock_kernel();
 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_bloc() - `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_private_info * uspi = UFS_SB(sb)->s_uspi;
 419         struct buffer_head * bh;
 420         int ret, err, new;
 421         unsigned long ptr,phys;
 422         u64 phys64 = 0;
 423
 424         if (!create) {
 425                 phys64 = ufs_frag_map(inode, fragment);
 426                 UFSD("phys64 = %llu\n", (unsigned long long)phys64);
 427                 if (phys64)
 428                         map_bh(bh_result, sb, phys64);
 429                 return 0;
 430         }
 431
 432         /* This code entered only while writing ....? */
 433
 434         err = -EIO;
 435         new = 0;
 436         ret = 0;
 437         bh = NULL;
 438
 439         lock_kernel();
 440
 441         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 442         if (fragment >
 443             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
 444              << uspi->s_fpbshift))
 445                 goto abort_too_big;
 446
 447         err = 0;
 448         ptr = fragment;
 449
 450         /*
 451          * ok, these macros clean the logic up a bit and make
 452          * it much more readable:
 453          */
 454 #define GET_INODE_DATABLOCK(x) \
 455         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new,\
 456                           bh_result->b_page)
 457 #define GET_INODE_PTR(x) \
 458         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL,\
 459                           bh_result->b_page)
 460 #define GET_INDIRECT_DATABLOCK(x) \
 461         ufs_inode_getblock(inode, bh, x, fragment,      \
 462                           &err, &phys, &new, bh_result->b_page)
 463 #define GET_INDIRECT_PTR(x) \
 464         ufs_inode_getblock(inode, bh, x, fragment,      \
 465                           &err, NULL, NULL, NULL)
 466
 467         if (ptr < UFS_NDIR_FRAGMENT) {
 468                 bh = GET_INODE_DATABLOCK(ptr);
 469                 goto out;
 470         }
 471         ptr -= UFS_NDIR_FRAGMENT;
 472         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
 473                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
 474                 goto get_indirect;
 475         }
 476         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 477         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
 478                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
 479                 goto get_double;
 480         }
 481         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 482         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
 483         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
 484 get_double:
 485         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 486 get_indirect:
 487         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
 488
 489 #undef GET_INODE_DATABLOCK
 490 #undef GET_INODE_PTR
 491 #undef GET_INDIRECT_DATABLOCK
 492 #undef GET_INDIRECT_PTR
 493
 494 out:
 495         if (err)
 496                 goto abort;
 497         if (new)
 498                 set_buffer_new(bh_result);
 499         map_bh(bh_result, sb, phys);
 500 abort:
 501         unlock_kernel();
 502         return err;
 503
 504 abort_too_big:
 505         ufs_warning(sb, "ufs_get_block", "block > big");
 506         goto abort;
 507 }
 508
 509 static struct buffer_head *ufs_getfrag(struct inode *inode,
 510                                        unsigned int fragment,
 511                                        int create, int *err)
 512 {
 513         struct buffer_head dummy;
 514         int error;
 515
 516         dummy.b_state = 0;
 517         dummy.b_blocknr = -1000;
 518         error = ufs_getfrag_block(inode, fragment, &dummy, create);
 519         *err = error;
 520         if (!error && buffer_mapped(&dummy)) {
 521                 struct buffer_head *bh;
 522                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 523                 if (buffer_new(&dummy)) {
 524                         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 525                         set_buffer_uptodate(bh);
 526                         mark_buffer_dirty(bh);
 527                 }
 528                 return bh;
 529         }
 530         return NULL;
 531 }
 532
 533 struct buffer_head * ufs_bread (struct inode * inode, unsigned fragment,
 534         int create, int * err)
 535 {
 536         struct buffer_head * bh;
 537
 538         UFSD("ENTER, ino %lu, fragment %u\n", inode->i_ino, fragment);
 539         bh = ufs_getfrag (inode, fragment, create, err);
 540         if (!bh || buffer_uptodate(bh))
 541                 return bh;
 542         ll_rw_block (READ, 1, &bh);
 543         wait_on_buffer (bh);
 544         if (buffer_uptodate(bh))
 545                 return bh;
 546         brelse (bh);
 547         *err = -EIO;
 548         return NULL;
 549 }
 550
 551 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 552 {
 553         return block_write_full_page(page,ufs_getfrag_block,wbc);
 554 }
 555
 556 static int ufs_readpage(struct file *file, struct page *page)
 557 {
 558         return block_read_full_page(page,ufs_getfrag_block);
 559 }
 560
 561 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 562 {
 563         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 564 }
 565
 566 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 567                         loff_t pos, unsigned len, unsigned flags,
 568                         struct page **pagep, void **fsdata)
 569 {
 570         int ret;
 571
 572         ret = block_write_begin(mapping, pos, len, flags, pagep,
 573                                 ufs_getfrag_block);
 574         if (unlikely(ret)) {
 575                 loff_t isize = mapping->host->i_size;
 576                 if (pos + len > isize)
 577                         vmtruncate(mapping->host, isize);
 578         }
 579
 580         return ret;
 581 }
 582
 583 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 584 {
 585         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 586 }
 587
 588 const struct address_space_operations ufs_aops = {
 589         .readpage = ufs_readpage,
 590         .writepage = ufs_writepage,
 591         .write_begin = ufs_write_begin,
 592         .write_end = generic_write_end,
 593         .bmap = ufs_bmap
 594 };
 595
 596 static void ufs_set_inode_ops(struct inode *inode)
 597 {
 598         if (S_ISREG(inode->i_mode)) {
 599                 inode->i_op = &ufs_file_inode_operations;
 600                 inode->i_fop = &ufs_file_operations;
 601                 inode->i_mapping->a_ops = &ufs_aops;
 602         } else if (S_ISDIR(inode->i_mode)) {
 603                 inode->i_op = &ufs_dir_inode_operations;
 604                 inode->i_fop = &ufs_dir_operations;
 605                 inode->i_mapping->a_ops = &ufs_aops;
 606         } else if (S_ISLNK(inode->i_mode)) {
 607                 if (!inode->i_blocks)
 608                         inode->i_op = &ufs_fast_symlink_inode_operations;
 609                 else {
 610                         inode->i_op = &ufs_symlink_inode_operations;
 611                         inode->i_mapping->a_ops = &ufs_aops;
 612                 }
 613         } else
 614                 init_special_inode(inode, inode->i_mode,
 615                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 616 }
 617
 618 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 619 {
 620         struct ufs_inode_info *ufsi = UFS_I(inode);
 621         struct super_block *sb = inode->i_sb;
 622         mode_t mode;
 623
 624         /*
 625          * Copy data to the in-core inode.
 626          */
 627         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 628         inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
 629         if (inode->i_nlink == 0) {
 630                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 631                 return -1;
 632         }
 633
 634         /*
 635          * Linux now has 32-bit uid and gid, so we can support EFT.
 636          */
 637         inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
 638         inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);
 639
 640         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 641         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 642         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 643         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 644         inode->i_mtime.tv_nsec = 0;
 645         inode->i_atime.tv_nsec = 0;
 646         inode->i_ctime.tv_nsec = 0;
 647         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 648         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 649         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 650         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 651         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 652
 653
 654         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 655                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 656                        sizeof(ufs_inode->ui_u2.ui_addr));
 657         } else {
 658                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 659                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 660                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 661         }
 662         return 0;
 663 }
 664
 665 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 666 {
 667         struct ufs_inode_info *ufsi = UFS_I(inode);
 668         struct super_block *sb = inode->i_sb;
 669         mode_t mode;
 670
 671         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 672         /*
 673          * Copy data to the in-core inode.
 674          */
 675         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 676         inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
 677         if (inode->i_nlink == 0) {
 678                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 679                 return -1;
 680         }
 681
 682         /*
 683          * Linux now has 32-bit uid and gid, so we can support EFT.
 684          */
 685         inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
 686         inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
 687
 688         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 689         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 690         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 691         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 692         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 693         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 694         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 695         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 696         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 697         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 698         /*
 699         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 700         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 701         */
 702
 703         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 704                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 705                        sizeof(ufs2_inode->ui_u2.ui_addr));
 706         } else {
 707                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 708                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 709                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 710         }
 711         return 0;
 712 }
 713
 714 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 715 {
 716         struct ufs_inode_info *ufsi;
 717         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 718         struct buffer_head * bh;
 719         struct inode *inode;
 720         int err;
 721
 722         UFSD("ENTER, ino %lu\n", ino);
 723
 724         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 725                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 726                             ino);
 727                 return ERR_PTR(-EIO);
 728         }
 729
 730         inode = iget_locked(sb, ino);
 731         if (!inode)
 732                 return ERR_PTR(-ENOMEM);
 733         if (!(inode->i_state & I_NEW))
 734                 return inode;
 735
 736         ufsi = UFS_I(inode);
 737
 738         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 739         if (!bh) {
 740                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 741                             inode->i_ino);
 742                 goto bad_inode;
 743         }
 744         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 745                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 746
 747                 err = ufs2_read_inode(inode,
 748                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 749         } else {
 750                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 751
 752                 err = ufs1_read_inode(inode,
 753                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 754         }
 755
 756         if (err)
 757                 goto bad_inode;
 758         inode->i_version++;
 759         ufsi->i_lastfrag =
 760                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 761         ufsi->i_dir_start_lookup = 0;
 762         ufsi->i_osync = 0;
 763
 764         ufs_set_inode_ops(inode);
 765
 766         brelse(bh);
 767
 768         UFSD("EXIT\n");
 769         unlock_new_inode(inode);
 770         return inode;
 771
 772 bad_inode:
 773         iget_failed(inode);
 774         return ERR_PTR(-EIO);
 775 }
 776
 777 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 778 {
 779         struct super_block *sb = inode->i_sb;
 780         struct ufs_inode_info *ufsi = UFS_I(inode);
 781
 782         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 783         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 784
 785         ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
 786         ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
 787
 788         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 789         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 790         ufs_inode->ui_atime.tv_usec = 0;
 791         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 792         ufs_inode->ui_ctime.tv_usec = 0;
 793         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 794         ufs_inode->ui_mtime.tv_usec = 0;
 795         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 796         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 797         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 798
 799         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 800                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 801                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 802         }
 803
 804         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 805                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 806                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 807         } else if (inode->i_blocks) {
 808                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 809                        sizeof(ufs_inode->ui_u2.ui_addr));
 810         }
 811         else {
 812                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 813                        sizeof(ufs_inode->ui_u2.ui_symlink));
 814         }
 815
 816         if (!inode->i_nlink)
 817                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 818 }
 819
 820 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 821 {
 822         struct super_block *sb = inode->i_sb;
 823         struct ufs_inode_info *ufsi = UFS_I(inode);
 824
 825         UFSD("ENTER\n");
 826         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 827         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 828
 829         ufs_inode->ui_uid = cpu_to_fs32(sb, inode->i_uid);
 830         ufs_inode->ui_gid = cpu_to_fs32(sb, inode->i_gid);
 831
 832         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 833         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 834         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 835         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 836         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 837         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 838         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 839
 840         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 841         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 842         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 843
 844         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 845                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 846                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 847         } else if (inode->i_blocks) {
 848                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 849                        sizeof(ufs_inode->ui_u2.ui_addr));
 850         } else {
 851                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 852                        sizeof(ufs_inode->ui_u2.ui_symlink));
 853         }
 854
 855         if (!inode->i_nlink)
 856                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 857         UFSD("EXIT\n");
 858 }
 859
 860 static int ufs_update_inode(struct inode * inode, int do_sync)
 861 {
 862         struct super_block *sb = inode->i_sb;
 863         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 864         struct buffer_head * bh;
 865
 866         UFSD("ENTER, ino %lu\n", inode->i_ino);
 867
 868         if (inode->i_ino < UFS_ROOTINO ||
 869             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 870                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 871                 return -1;
 872         }
 873
 874         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 875         if (!bh) {
 876                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 877                 return -1;
 878         }
 879         if (uspi->fs_magic == UFS2_MAGIC) {
 880                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 881
 882                 ufs2_update_inode(inode,
 883                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 884         } else {
 885                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 886
 887                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 888         }
 889
 890         mark_buffer_dirty(bh);
 891         if (do_sync)
 892                 sync_dirty_buffer(bh);
 893         brelse (bh);
 894
 895         UFSD("EXIT\n");
 896         return 0;
 897 }
 898
 899 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 900 {
 901         int ret;
 902         lock_kernel();
 903         ret = ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 904         unlock_kernel();
 905         return ret;
 906 }
 907
 908 int ufs_sync_inode (struct inode *inode)
 909 {
 910         return ufs_update_inode (inode, 1);
 911 }
 912
 913 void ufs_evict_inode(struct inode * inode)
 914 {
 915         int want_delete = 0;
 916
 917         if (!inode->i_nlink && !is_bad_inode(inode))
 918                 want_delete = 1;
 919
 920         truncate_inode_pages(&inode->i_data, 0);
 921         if (want_delete) {
 922                 loff_t old_i_size;
 923                 /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
 924                 lock_kernel();
 925                 mark_inode_dirty(inode);
 926                 ufs_update_inode(inode, IS_SYNC(inode));
 927                 old_i_size = inode->i_size;
 928                 inode->i_size = 0;
 929                 if (inode->i_blocks && ufs_truncate(inode, old_i_size))
 930                         ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
 931                 unlock_kernel();
 932         }
 933
 934         invalidate_inode_buffers(inode);
 935         end_writeback(inode);
 936
 937         if (want_delete) {
 938                 lock_kernel();
 939                 ufs_free_inode (inode);
 940                 unlock_kernel();
 941         }
 942 }