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/ufs_fs.h>
  34 #include <linux/time.h>
  35 #include <linux/stat.h>
  36 #include <linux/string.h>
  37 #include <linux/mm.h>
  38 #include <linux/smp_lock.h>
  39 #include <linux/buffer_head.h>
  40
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static u64 ufs_frag_map(struct inode *inode, sector_t frag);
  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 < 0) {
  59                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block < 0");
  60         } else 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 static void ufs_clear_frag(struct inode *inode, struct buffer_head *bh)
 160 {
 161         lock_buffer(bh);
 162         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 163         set_buffer_uptodate(bh);
 164         mark_buffer_dirty(bh);
 165         unlock_buffer(bh);
 166         if (IS_SYNC(inode))
 167                 sync_dirty_buffer(bh);
 168 }
 169
 170 static struct buffer_head *
 171 ufs_clear_frags(struct inode *inode, sector_t beg,
 172                 unsigned int n)
 173 {
 174         struct buffer_head *res, *bh;
 175         sector_t end = beg + n;
 176
 177         res = sb_getblk(inode->i_sb, beg);
 178         ufs_clear_frag(inode, res);
 179         for (++beg; beg < end; ++beg) {
 180                 bh = sb_getblk(inode->i_sb, beg);
 181                 ufs_clear_frag(inode, bh);
 182                 brelse(bh);
 183         }
 184         return res;
 185 }
 186
 187 /**
 188  * ufs_inode_getfrag() - allocate new fragment(s)
 189  * @inode - pointer to inode
 190  * @fragment - number of `fragment' which hold pointer
 191  *   to new allocated fragment(s)
 192  * @new_fragment - number of new allocated fragment(s)
 193  * @required - how many fragment(s) we require
 194  * @err - we set it if something wrong
 195  * @phys - pointer to where we save physical number of new allocated fragments,
 196  *   NULL if we allocate not data(indirect blocks for example).
 197  * @new - we set it if we allocate new block
 198  * @locked_page - for ufs_new_fragments()
 199  */
 200 static struct buffer_head *
 201 ufs_inode_getfrag(struct inode *inode, unsigned int fragment,
 202                   sector_t new_fragment, unsigned int required, int *err,
 203                   long *phys, int *new, struct page *locked_page)
 204 {
 205         struct ufs_inode_info *ufsi = UFS_I(inode);
 206         struct super_block *sb = inode->i_sb;
 207         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 208         struct buffer_head * result;
 209         unsigned block, blockoff, lastfrag, lastblock, lastblockoff;
 210         unsigned tmp, goal;
 211         __fs32 * p, * p2;
 212
 213         UFSD("ENTER, ino %lu, fragment %u, new_fragment %llu, required %u, "
 214              "metadata %d\n", inode->i_ino, fragment,
 215              (unsigned long long)new_fragment, required, !phys);
 216
 217         /* TODO : to be done for write support
 218         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 219              goto ufs2;
 220          */
 221
 222         block = ufs_fragstoblks (fragment);
 223         blockoff = ufs_fragnum (fragment);
 224         p = ufsi->i_u1.i_data + block;
 225         goal = 0;
 226
 227 repeat:
 228         tmp = fs32_to_cpu(sb, *p);
 229         lastfrag = ufsi->i_lastfrag;
 230         if (tmp && fragment < lastfrag) {
 231                 if (!phys) {
 232                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 233                         if (tmp == fs32_to_cpu(sb, *p)) {
 234                                 UFSD("EXIT, result %u\n", tmp + blockoff);
 235                                 return result;
 236                         }
 237                         brelse (result);
 238                         goto repeat;
 239                 } else {
 240                         *phys = tmp + blockoff;
 241                         return NULL;
 242                 }
 243         }
 244
 245         lastblock = ufs_fragstoblks (lastfrag);
 246         lastblockoff = ufs_fragnum (lastfrag);
 247         /*
 248          * We will extend file into new block beyond last allocated block
 249          */
 250         if (lastblock < block) {
 251                 /*
 252                  * We must reallocate last allocated block
 253                  */
 254                 if (lastblockoff) {
 255                         p2 = ufsi->i_u1.i_data + lastblock;
 256                         tmp = ufs_new_fragments (inode, p2, lastfrag,
 257                                                  fs32_to_cpu(sb, *p2), uspi->s_fpb - lastblockoff,
 258                                                  err, locked_page);
 259                         if (!tmp) {
 260                                 if (lastfrag != ufsi->i_lastfrag)
 261                                         goto repeat;
 262                                 else
 263                                         return NULL;
 264                         }
 265                         lastfrag = ufsi->i_lastfrag;
 266
 267                 }
 268                 goal = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock]) + uspi->s_fpb;
 269                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 270                                          goal, required + blockoff,
 271                                          err, locked_page);
 272         }
 273         /*
 274          * We will extend last allocated block
 275          */
 276         else if (lastblock == block) {
 277                 tmp = ufs_new_fragments(inode, p, fragment - (blockoff - lastblockoff),
 278                                         fs32_to_cpu(sb, *p), required +  (blockoff - lastblockoff),
 279                                         err, locked_page);
 280         }
 281         /*
 282          * We will allocate new block before last allocated block
 283          */
 284         else /* (lastblock > block) */ {
 285                 if (lastblock && (tmp = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock-1])))
 286                         goal = tmp + uspi->s_fpb;
 287                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 288                                         goal, uspi->s_fpb, err, locked_page);
 289         }
 290         if (!tmp) {
 291                 if ((!blockoff && *p) ||
 292                     (blockoff && lastfrag != ufsi->i_lastfrag))
 293                         goto repeat;
 294                 *err = -ENOSPC;
 295                 return NULL;
 296         }
 297
 298         if (!phys) {
 299                 result = ufs_clear_frags(inode, tmp + blockoff, required);
 300         } else {
 301                 *phys = tmp + blockoff;
 302                 result = NULL;
 303                 *err = 0;
 304                 *new = 1;
 305         }
 306
 307         inode->i_ctime = CURRENT_TIME_SEC;
 308         if (IS_SYNC(inode))
 309                 ufs_sync_inode (inode);
 310         mark_inode_dirty(inode);
 311         UFSD("EXIT, result %u\n", tmp + blockoff);
 312         return result;
 313
 314      /* This part : To be implemented ....
 315         Required only for writing, not required for READ-ONLY.
 316 ufs2:
 317
 318         u2_block = ufs_fragstoblks(fragment);
 319         u2_blockoff = ufs_fragnum(fragment);
 320         p = ufsi->i_u1.u2_i_data + block;
 321         goal = 0;
 322
 323 repeat2:
 324         tmp = fs32_to_cpu(sb, *p);
 325         lastfrag = ufsi->i_lastfrag;
 326
 327      */
 328 }
 329
 330 /**
 331  * ufs_inode_getblock() - allocate new block
 332  * @inode - pointer to inode
 333  * @bh - pointer to block which hold "pointer" to new allocated block
 334  * @fragment - number of `fragment' which hold pointer
 335  *   to new allocated block
 336  * @new_fragment - number of new allocated fragment
 337  *  (block will hold this fragment and also uspi->s_fpb-1)
 338  * @err - see ufs_inode_getfrag()
 339  * @phys - see ufs_inode_getfrag()
 340  * @new - see ufs_inode_getfrag()
 341  * @locked_page - see ufs_inode_getfrag()
 342  */
 343 static struct buffer_head *
 344 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 345                   unsigned int fragment, sector_t new_fragment, int *err,
 346                   long *phys, int *new, struct page *locked_page)
 347 {
 348         struct super_block *sb = inode->i_sb;
 349         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 350         struct buffer_head * result;
 351         unsigned tmp, goal, block, blockoff;
 352         __fs32 * p;
 353
 354         block = ufs_fragstoblks (fragment);
 355         blockoff = ufs_fragnum (fragment);
 356
 357         UFSD("ENTER, ino %lu, fragment %u, new_fragment %llu, metadata %d\n",
 358              inode->i_ino, fragment, (unsigned long long)new_fragment, !phys);
 359
 360         result = NULL;
 361         if (!bh)
 362                 goto out;
 363         if (!buffer_uptodate(bh)) {
 364                 ll_rw_block (READ, 1, &bh);
 365                 wait_on_buffer (bh);
 366                 if (!buffer_uptodate(bh))
 367                         goto out;
 368         }
 369
 370         p = (__fs32 *) bh->b_data + block;
 371 repeat:
 372         tmp = fs32_to_cpu(sb, *p);
 373         if (tmp) {
 374                 if (!phys) {
 375                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 376                         if (tmp == fs32_to_cpu(sb, *p))
 377                                 goto out;
 378                         brelse (result);
 379                         goto repeat;
 380                 } else {
 381                         *phys = tmp + blockoff;
 382                         goto out;
 383                 }
 384         }
 385
 386         if (block && (tmp = fs32_to_cpu(sb, ((__fs32*)bh->b_data)[block-1]) + uspi->s_fpb))
 387                 goal = tmp + uspi->s_fpb;
 388         else
 389                 goal = bh->b_blocknr + uspi->s_fpb;
 390         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 391                                 uspi->s_fpb, err, locked_page);
 392         if (!tmp) {
 393                 if (fs32_to_cpu(sb, *p))
 394                         goto repeat;
 395                 goto out;
 396         }
 397
 398
 399         if (!phys) {
 400                 result = ufs_clear_frags(inode, tmp + blockoff, uspi->s_fpb);
 401         } else {
 402                 *phys = tmp + blockoff;
 403                 *new = 1;
 404         }
 405
 406         mark_buffer_dirty(bh);
 407         if (IS_SYNC(inode))
 408                 sync_dirty_buffer(bh);
 409         inode->i_ctime = CURRENT_TIME_SEC;
 410         mark_inode_dirty(inode);
 411         UFSD("result %u\n", tmp + blockoff);
 412 out:
 413         brelse (bh);
 414         UFSD("EXIT\n");
 415         return result;
 416 }
 417
 418 /**
 419  * ufs_getfrag_bloc() - `get_block_t' function, interface between UFS and
 420  * readpage, writepage and so on
 421  */
 422
 423 int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 424 {
 425         struct super_block * sb = inode->i_sb;
 426         struct ufs_sb_private_info * uspi = UFS_SB(sb)->s_uspi;
 427         struct buffer_head * bh;
 428         int ret, err, new;
 429         unsigned long ptr,phys;
 430         u64 phys64 = 0;
 431
 432         if (!create) {
 433                 phys64 = ufs_frag_map(inode, fragment);
 434                 UFSD("phys64 = %llu\n", (unsigned long long)phys64);
 435                 if (phys64)
 436                         map_bh(bh_result, sb, phys64);
 437                 return 0;
 438         }
 439
 440         /* This code entered only while writing ....? */
 441
 442         err = -EIO;
 443         new = 0;
 444         ret = 0;
 445         bh = NULL;
 446
 447         lock_kernel();
 448
 449         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 450         if (fragment < 0)
 451                 goto abort_negative;
 452         if (fragment >
 453             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
 454              << uspi->s_fpbshift))
 455                 goto abort_too_big;
 456
 457         err = 0;
 458         ptr = fragment;
 459
 460         /*
 461          * ok, these macros clean the logic up a bit and make
 462          * it much more readable:
 463          */
 464 #define GET_INODE_DATABLOCK(x) \
 465         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new, bh_result->b_page)
 466 #define GET_INODE_PTR(x) \
 467         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL, bh_result->b_page)
 468 #define GET_INDIRECT_DATABLOCK(x) \
 469         ufs_inode_getblock(inode, bh, x, fragment,      \
 470                           &err, &phys, &new, bh_result->b_page);
 471 #define GET_INDIRECT_PTR(x) \
 472         ufs_inode_getblock(inode, bh, x, fragment,      \
 473                           &err, NULL, NULL, bh_result->b_page);
 474
 475         if (ptr < UFS_NDIR_FRAGMENT) {
 476                 bh = GET_INODE_DATABLOCK(ptr);
 477                 goto out;
 478         }
 479         ptr -= UFS_NDIR_FRAGMENT;
 480         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
 481                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
 482                 goto get_indirect;
 483         }
 484         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 485         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
 486                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
 487                 goto get_double;
 488         }
 489         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 490         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
 491         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
 492 get_double:
 493         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 494 get_indirect:
 495         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
 496
 497 #undef GET_INODE_DATABLOCK
 498 #undef GET_INODE_PTR
 499 #undef GET_INDIRECT_DATABLOCK
 500 #undef GET_INDIRECT_PTR
 501
 502 out:
 503         if (err)
 504                 goto abort;
 505         if (new)
 506                 set_buffer_new(bh_result);
 507         map_bh(bh_result, sb, phys);
 508 abort:
 509         unlock_kernel();
 510         return err;
 511
 512 abort_negative:
 513         ufs_warning(sb, "ufs_get_block", "block < 0");
 514         goto abort;
 515
 516 abort_too_big:
 517         ufs_warning(sb, "ufs_get_block", "block > big");
 518         goto abort;
 519 }
 520
 521 static struct buffer_head *ufs_getfrag(struct inode *inode,
 522                                        unsigned int fragment,
 523                                        int create, int *err)
 524 {
 525         struct buffer_head dummy;
 526         int error;
 527
 528         dummy.b_state = 0;
 529         dummy.b_blocknr = -1000;
 530         error = ufs_getfrag_block(inode, fragment, &dummy, create);
 531         *err = error;
 532         if (!error && buffer_mapped(&dummy)) {
 533                 struct buffer_head *bh;
 534                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 535                 if (buffer_new(&dummy)) {
 536                         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 537                         set_buffer_uptodate(bh);
 538                         mark_buffer_dirty(bh);
 539                 }
 540                 return bh;
 541         }
 542         return NULL;
 543 }
 544
 545 struct buffer_head * ufs_bread (struct inode * inode, unsigned fragment,
 546         int create, int * err)
 547 {
 548         struct buffer_head * bh;
 549
 550         UFSD("ENTER, ino %lu, fragment %u\n", inode->i_ino, fragment);
 551         bh = ufs_getfrag (inode, fragment, create, err);
 552         if (!bh || buffer_uptodate(bh))
 553                 return bh;
 554         ll_rw_block (READ, 1, &bh);
 555         wait_on_buffer (bh);
 556         if (buffer_uptodate(bh))
 557                 return bh;
 558         brelse (bh);
 559         *err = -EIO;
 560         return NULL;
 561 }
 562
 563 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 564 {
 565         return block_write_full_page(page,ufs_getfrag_block,wbc);
 566 }
 567 static int ufs_readpage(struct file *file, struct page *page)
 568 {
 569         return block_read_full_page(page,ufs_getfrag_block);
 570 }
 571 static int ufs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 572 {
 573         return block_prepare_write(page,from,to,ufs_getfrag_block);
 574 }
 575 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 576 {
 577         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 578 }
 579 const struct address_space_operations ufs_aops = {
 580         .readpage = ufs_readpage,
 581         .writepage = ufs_writepage,
 582         .sync_page = block_sync_page,
 583         .prepare_write = ufs_prepare_write,
 584         .commit_write = generic_commit_write,
 585         .bmap = ufs_bmap
 586 };
 587
 588 static void ufs_set_inode_ops(struct inode *inode)
 589 {
 590         if (S_ISREG(inode->i_mode)) {
 591                 inode->i_op = &ufs_file_inode_operations;
 592                 inode->i_fop = &ufs_file_operations;
 593                 inode->i_mapping->a_ops = &ufs_aops;
 594         } else if (S_ISDIR(inode->i_mode)) {
 595                 inode->i_op = &ufs_dir_inode_operations;
 596                 inode->i_fop = &ufs_dir_operations;
 597                 inode->i_mapping->a_ops = &ufs_aops;
 598         } else if (S_ISLNK(inode->i_mode)) {
 599                 if (!inode->i_blocks)
 600                         inode->i_op = &ufs_fast_symlink_inode_operations;
 601                 else {
 602                         inode->i_op = &page_symlink_inode_operations;
 603                         inode->i_mapping->a_ops = &ufs_aops;
 604                 }
 605         } else
 606                 init_special_inode(inode, inode->i_mode,
 607                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 608 }
 609
 610 static void ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 611 {
 612         struct ufs_inode_info *ufsi = UFS_I(inode);
 613         struct super_block *sb = inode->i_sb;
 614         mode_t mode;
 615         unsigned i;
 616
 617         /*
 618          * Copy data to the in-core inode.
 619          */
 620         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 621         inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
 622         if (inode->i_nlink == 0)
 623                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 624
 625         /*
 626          * Linux now has 32-bit uid and gid, so we can support EFT.
 627          */
 628         inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
 629         inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);
 630
 631         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 632         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 633         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 634         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 635         inode->i_mtime.tv_nsec = 0;
 636         inode->i_atime.tv_nsec = 0;
 637         inode->i_ctime.tv_nsec = 0;
 638         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 639         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 640         ufsi->i_gen = fs32_to_cpu(sb, ufs_inode->ui_gen);
 641         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 642         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 643
 644
 645         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 646                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 647                         ufsi->i_u1.i_data[i] = ufs_inode->ui_u2.ui_addr.ui_db[i];
 648         } else {
 649                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 650                         ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
 651         }
 652 }
 653
 654 static void ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 655 {
 656         struct ufs_inode_info *ufsi = UFS_I(inode);
 657         struct super_block *sb = inode->i_sb;
 658         mode_t mode;
 659         unsigned i;
 660
 661         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 662         /*
 663          * Copy data to the in-core inode.
 664          */
 665         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 666         inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
 667         if (inode->i_nlink == 0)
 668                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 669
 670         /*
 671          * Linux now has 32-bit uid and gid, so we can support EFT.
 672          */
 673         inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
 674         inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
 675
 676         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 677         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_atime.tv_sec);
 678         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_ctime.tv_sec);
 679         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_mtime.tv_sec);
 680         inode->i_mtime.tv_nsec = 0;
 681         inode->i_atime.tv_nsec = 0;
 682         inode->i_ctime.tv_nsec = 0;
 683         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 684         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 685         ufsi->i_gen = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 686         /*
 687         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 688         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 689         */
 690
 691         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 692                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 693                         ufsi->i_u1.u2_i_data[i] =
 694                                 ufs2_inode->ui_u2.ui_addr.ui_db[i];
 695         } else {
 696                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 697                         ufsi->i_u1.i_symlink[i] = ufs2_inode->ui_u2.ui_symlink[i];
 698         }
 699 }
 700
 701 void ufs_read_inode(struct inode * inode)
 702 {
 703         struct ufs_inode_info *ufsi = UFS_I(inode);
 704         struct super_block * sb;
 705         struct ufs_sb_private_info * uspi;
 706         struct buffer_head * bh;
 707
 708         UFSD("ENTER, ino %lu\n", inode->i_ino);
 709
 710         sb = inode->i_sb;
 711         uspi = UFS_SB(sb)->s_uspi;
 712
 713         if (inode->i_ino < UFS_ROOTINO ||
 714             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 715                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 716                             inode->i_ino);
 717                 goto bad_inode;
 718         }
 719
 720         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 721         if (!bh) {
 722                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 723                             inode->i_ino);
 724                 goto bad_inode;
 725         }
 726         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 727                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 728
 729                 ufs2_read_inode(inode,
 730                                 ufs2_inode + ufs_inotofsbo(inode->i_ino));
 731         } else {
 732                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 733
 734                 ufs1_read_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 735         }
 736
 737         inode->i_blksize = PAGE_SIZE;/*This is the optimal IO size (for stat)*/
 738         inode->i_version++;
 739         ufsi->i_lastfrag =
 740                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 741         ufsi->i_dir_start_lookup = 0;
 742         ufsi->i_osync = 0;
 743
 744         ufs_set_inode_ops(inode);
 745
 746         brelse(bh);
 747
 748         UFSD("EXIT\n");
 749         return;
 750
 751 bad_inode:
 752         make_bad_inode(inode);
 753 }
 754
 755 static int ufs_update_inode(struct inode * inode, int do_sync)
 756 {
 757         struct ufs_inode_info *ufsi = UFS_I(inode);
 758         struct super_block * sb;
 759         struct ufs_sb_private_info * uspi;
 760         struct buffer_head * bh;
 761         struct ufs_inode * ufs_inode;
 762         unsigned i;
 763         unsigned flags;
 764
 765         UFSD("ENTER, ino %lu\n", inode->i_ino);
 766
 767         sb = inode->i_sb;
 768         uspi = UFS_SB(sb)->s_uspi;
 769         flags = UFS_SB(sb)->s_flags;
 770
 771         if (inode->i_ino < UFS_ROOTINO ||
 772             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 773                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 774                 return -1;
 775         }
 776
 777         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 778         if (!bh) {
 779                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 780                 return -1;
 781         }
 782         ufs_inode = (struct ufs_inode *) (bh->b_data + ufs_inotofsbo(inode->i_ino) * sizeof(struct ufs_inode));
 783
 784         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 785         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 786
 787         ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
 788         ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
 789
 790         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 791         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 792         ufs_inode->ui_atime.tv_usec = 0;
 793         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 794         ufs_inode->ui_ctime.tv_usec = 0;
 795         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 796         ufs_inode->ui_mtime.tv_usec = 0;
 797         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 798         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 799         ufs_inode->ui_gen = cpu_to_fs32(sb, ufsi->i_gen);
 800
 801         if ((flags & UFS_UID_MASK) == UFS_UID_EFT) {
 802                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 803                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 804         }
 805
 806         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 807                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 808                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 809         } else if (inode->i_blocks) {
 810                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 811                         ufs_inode->ui_u2.ui_addr.ui_db[i] = ufsi->i_u1.i_data[i];
 812         }
 813         else {
 814                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 815                         ufs_inode->ui_u2.ui_symlink[i] = ufsi->i_u1.i_symlink[i];
 816         }
 817
 818         if (!inode->i_nlink)
 819                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 820
 821         mark_buffer_dirty(bh);
 822         if (do_sync)
 823                 sync_dirty_buffer(bh);
 824         brelse (bh);
 825
 826         UFSD("EXIT\n");
 827         return 0;
 828 }
 829
 830 int ufs_write_inode (struct inode * inode, int wait)
 831 {
 832         int ret;
 833         lock_kernel();
 834         ret = ufs_update_inode (inode, wait);
 835         unlock_kernel();
 836         return ret;
 837 }
 838
 839 int ufs_sync_inode (struct inode *inode)
 840 {
 841         return ufs_update_inode (inode, 1);
 842 }
 843
 844 void ufs_delete_inode (struct inode * inode)
 845 {
 846         loff_t old_i_size;
 847
 848         truncate_inode_pages(&inode->i_data, 0);
 849         /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
 850         lock_kernel();
 851         mark_inode_dirty(inode);
 852         ufs_update_inode(inode, IS_SYNC(inode));
 853         old_i_size = inode->i_size;
 854         inode->i_size = 0;
 855         if (inode->i_blocks && ufs_truncate(inode, old_i_size))
 856                 ufs_warning(inode->i_sb, __FUNCTION__, "ufs_truncate failed\n");
 857         ufs_free_inode (inode);
 858         unlock_kernel();
 859 }