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",uspi->s_fpbshift,uspi->s_apbmask,mask);
 102
 103         if (depth == 0)
 104                 return 0;
 105
 106         p = offsets;
 107
 108         lock_kernel();
 109         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 110                 goto ufs2;
 111
 112         block = ufsi->i_u1.i_data[*p++];
 113         if (!block)
 114                 goto out;
 115         while (--depth) {
 116                 struct buffer_head *bh;
 117                 sector_t n = *p++;
 118
 119                 bh = sb_bread(sb, uspi->s_sbbase + fs32_to_cpu(sb, block)+(n>>shift));
 120                 if (!bh)
 121                         goto out;
 122                 block = ((__fs32 *) bh->b_data)[n & mask];
 123                 brelse (bh);
 124                 if (!block)
 125                         goto out;
 126         }
 127         ret = (u64) (uspi->s_sbbase + fs32_to_cpu(sb, block) + (frag & uspi->s_fpbmask));
 128         goto out;
 129 ufs2:
 130         u2_block = ufsi->i_u1.u2_i_data[*p++];
 131         if (!u2_block)
 132                 goto out;
 133
 134
 135         while (--depth) {
 136                 struct buffer_head *bh;
 137                 sector_t n = *p++;
 138
 139
 140                 temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
 141                 bh = sb_bread(sb, temp +(u64) (n>>shift));
 142                 if (!bh)
 143                         goto out;
 144                 u2_block = ((__fs64 *)bh->b_data)[n & mask];
 145                 brelse(bh);
 146                 if (!u2_block)
 147                         goto out;
 148         }
 149         temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
 150         ret = temp + (u64) (frag & uspi->s_fpbmask);
 151
 152 out:
 153         unlock_kernel();
 154         return ret;
 155 }
 156
 157 static void ufs_clear_frag(struct inode *inode, struct buffer_head *bh)
 158 {
 159         lock_buffer(bh);
 160         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 161         set_buffer_uptodate(bh);
 162         mark_buffer_dirty(bh);
 163         unlock_buffer(bh);
 164         if (IS_SYNC(inode))
 165                 sync_dirty_buffer(bh);
 166 }
 167
 168 static struct buffer_head *
 169 ufs_clear_frags(struct inode *inode, sector_t beg,
 170                 unsigned int n)
 171 {
 172         struct buffer_head *res, *bh;
 173         sector_t end = beg + n;
 174
 175         res = sb_getblk(inode->i_sb, beg);
 176         ufs_clear_frag(inode, res);
 177         for (++beg; beg < end; ++beg) {
 178                 bh = sb_getblk(inode->i_sb, beg);
 179                 ufs_clear_frag(inode, bh);
 180                 brelse(bh);
 181         }
 182         return res;
 183 }
 184
 185 /**
 186  * ufs_inode_getfrag() - allocate new fragment(s)
 187  * @inode - pointer to inode
 188  * @fragment - number of `fragment' which hold pointer
 189  *   to new allocated fragment(s)
 190  * @new_fragment - number of new allocated fragment(s)
 191  * @required - how many fragment(s) we require
 192  * @err - we set it if something wrong
 193  * @phys - pointer to where we save physical number of new allocated fragments,
 194  *   NULL if we allocate not data(indirect blocks for example).
 195  * @new - we set it if we allocate new block
 196  * @locked_page - for ufs_new_fragments()
 197  */
 198 static struct buffer_head *
 199 ufs_inode_getfrag(struct inode *inode, unsigned int fragment,
 200                   sector_t new_fragment, unsigned int required, int *err,
 201                   long *phys, int *new, struct page *locked_page)
 202 {
 203         struct ufs_inode_info *ufsi = UFS_I(inode);
 204         struct super_block *sb = inode->i_sb;
 205         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 206         struct buffer_head * result;
 207         unsigned block, blockoff, lastfrag, lastblock, lastblockoff;
 208         unsigned tmp, goal;
 209         __fs32 * p, * p2;
 210
 211         UFSD("ENTER, ino %lu, fragment %u, new_fragment %llu, required %u, "
 212              "metadata %d\n", inode->i_ino, fragment,
 213              (unsigned long long)new_fragment, required, !phys);
 214
 215         /* TODO : to be done for write support
 216         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 217              goto ufs2;
 218          */
 219
 220         block = ufs_fragstoblks (fragment);
 221         blockoff = ufs_fragnum (fragment);
 222         p = ufsi->i_u1.i_data + block;
 223         goal = 0;
 224
 225 repeat:
 226         tmp = fs32_to_cpu(sb, *p);
 227         lastfrag = ufsi->i_lastfrag;
 228         if (tmp && fragment < lastfrag) {
 229                 if (!phys) {
 230                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 231                         if (tmp == fs32_to_cpu(sb, *p)) {
 232                                 UFSD("EXIT, result %u\n", tmp + blockoff);
 233                                 return result;
 234                         }
 235                         brelse (result);
 236                         goto repeat;
 237                 } else {
 238                         *phys = tmp + blockoff;
 239                         return NULL;
 240                 }
 241         }
 242
 243         lastblock = ufs_fragstoblks (lastfrag);
 244         lastblockoff = ufs_fragnum (lastfrag);
 245         /*
 246          * We will extend file into new block beyond last allocated block
 247          */
 248         if (lastblock < block) {
 249                 /*
 250                  * We must reallocate last allocated block
 251                  */
 252                 if (lastblockoff) {
 253                         p2 = ufsi->i_u1.i_data + lastblock;
 254                         tmp = ufs_new_fragments (inode, p2, lastfrag,
 255                                                  fs32_to_cpu(sb, *p2), uspi->s_fpb - lastblockoff,
 256                                                  err, locked_page);
 257                         if (!tmp) {
 258                                 if (lastfrag != ufsi->i_lastfrag)
 259                                         goto repeat;
 260                                 else
 261                                         return NULL;
 262                         }
 263                         lastfrag = ufsi->i_lastfrag;
 264
 265                 }
 266                 goal = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock]) + uspi->s_fpb;
 267                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 268                                          goal, required + blockoff,
 269                                          err, locked_page);
 270         }
 271         /*
 272          * We will extend last allocated block
 273          */
 274         else if (lastblock == block) {
 275                 tmp = ufs_new_fragments(inode, p, fragment - (blockoff - lastblockoff),
 276                                         fs32_to_cpu(sb, *p), required +  (blockoff - lastblockoff),
 277                                         err, locked_page);
 278         }
 279         /*
 280          * We will allocate new block before last allocated block
 281          */
 282         else /* (lastblock > block) */ {
 283                 if (lastblock && (tmp = fs32_to_cpu(sb, ufsi->i_u1.i_data[lastblock-1])))
 284                         goal = tmp + uspi->s_fpb;
 285                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 286                                         goal, uspi->s_fpb, err, locked_page);
 287         }
 288         if (!tmp) {
 289                 if ((!blockoff && *p) ||
 290                     (blockoff && lastfrag != ufsi->i_lastfrag))
 291                         goto repeat;
 292                 *err = -ENOSPC;
 293                 return NULL;
 294         }
 295
 296         if (!phys) {
 297                 result = ufs_clear_frags(inode, tmp + blockoff, required);
 298         } else {
 299                 *phys = tmp + blockoff;
 300                 result = NULL;
 301                 *err = 0;
 302                 *new = 1;
 303         }
 304
 305         inode->i_ctime = CURRENT_TIME_SEC;
 306         if (IS_SYNC(inode))
 307                 ufs_sync_inode (inode);
 308         mark_inode_dirty(inode);
 309         UFSD("EXIT, result %u\n", tmp + blockoff);
 310         return result;
 311
 312      /* This part : To be implemented ....
 313         Required only for writing, not required for READ-ONLY.
 314 ufs2:
 315
 316         u2_block = ufs_fragstoblks(fragment);
 317         u2_blockoff = ufs_fragnum(fragment);
 318         p = ufsi->i_u1.u2_i_data + block;
 319         goal = 0;
 320
 321 repeat2:
 322         tmp = fs32_to_cpu(sb, *p);
 323         lastfrag = ufsi->i_lastfrag;
 324
 325      */
 326 }
 327
 328 /**
 329  * ufs_inode_getblock() - allocate new block
 330  * @inode - pointer to inode
 331  * @bh - pointer to block which hold "pointer" to new allocated block
 332  * @fragment - number of `fragment' which hold pointer
 333  *   to new allocated block
 334  * @new_fragment - number of new allocated fragment
 335  *  (block will hold this fragment and also uspi->s_fpb-1)
 336  * @err - see ufs_inode_getfrag()
 337  * @phys - see ufs_inode_getfrag()
 338  * @new - see ufs_inode_getfrag()
 339  * @locked_page - see ufs_inode_getfrag()
 340  */
 341 static struct buffer_head *
 342 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 343                   unsigned int fragment, sector_t new_fragment, int *err,
 344                   long *phys, int *new, struct page *locked_page)
 345 {
 346         struct super_block *sb = inode->i_sb;
 347         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 348         struct buffer_head * result;
 349         unsigned tmp, goal, block, blockoff;
 350         __fs32 * p;
 351
 352         block = ufs_fragstoblks (fragment);
 353         blockoff = ufs_fragnum (fragment);
 354
 355         UFSD("ENTER, ino %lu, fragment %u, new_fragment %llu, metadata %d\n",
 356              inode->i_ino, fragment, (unsigned long long)new_fragment, !phys);
 357
 358         result = NULL;
 359         if (!bh)
 360                 goto out;
 361         if (!buffer_uptodate(bh)) {
 362                 ll_rw_block (READ, 1, &bh);
 363                 wait_on_buffer (bh);
 364                 if (!buffer_uptodate(bh))
 365                         goto out;
 366         }
 367
 368         p = (__fs32 *) bh->b_data + block;
 369 repeat:
 370         tmp = fs32_to_cpu(sb, *p);
 371         if (tmp) {
 372                 if (!phys) {
 373                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 374                         if (tmp == fs32_to_cpu(sb, *p))
 375                                 goto out;
 376                         brelse (result);
 377                         goto repeat;
 378                 } else {
 379                         *phys = tmp + blockoff;
 380                         goto out;
 381                 }
 382         }
 383
 384         if (block && (tmp = fs32_to_cpu(sb, ((__fs32*)bh->b_data)[block-1]) + uspi->s_fpb))
 385                 goal = tmp + uspi->s_fpb;
 386         else
 387                 goal = bh->b_blocknr + uspi->s_fpb;
 388         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 389                                 uspi->s_fpb, err, locked_page);
 390         if (!tmp) {
 391                 if (fs32_to_cpu(sb, *p))
 392                         goto repeat;
 393                 goto out;
 394         }
 395
 396
 397         if (!phys) {
 398                 result = ufs_clear_frags(inode, tmp + blockoff, uspi->s_fpb);
 399         } else {
 400                 *phys = tmp + blockoff;
 401                 *new = 1;
 402         }
 403
 404         mark_buffer_dirty(bh);
 405         if (IS_SYNC(inode))
 406                 sync_dirty_buffer(bh);
 407         inode->i_ctime = CURRENT_TIME_SEC;
 408         mark_inode_dirty(inode);
 409         UFSD("result %u\n", tmp + blockoff);
 410 out:
 411         brelse (bh);
 412         UFSD("EXIT\n");
 413         return result;
 414 }
 415
 416 /**
 417  * ufs_getfrag_bloc() - `get_block_t' function, interface between UFS and
 418  * readpage, writepage and so on
 419  */
 420
 421 int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 422 {
 423         struct super_block * sb = inode->i_sb;
 424         struct ufs_sb_private_info * uspi = UFS_SB(sb)->s_uspi;
 425         struct buffer_head * bh;
 426         int ret, err, new;
 427         unsigned long ptr,phys;
 428         u64 phys64 = 0;
 429
 430         if (!create) {
 431                 phys64 = ufs_frag_map(inode, fragment);
 432                 UFSD("phys64 = %llu \n",phys64);
 433                 if (phys64)
 434                         map_bh(bh_result, sb, phys64);
 435                 return 0;
 436         }
 437
 438         /* This code entered only while writing ....? */
 439
 440         err = -EIO;
 441         new = 0;
 442         ret = 0;
 443         bh = NULL;
 444
 445         lock_kernel();
 446
 447         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 448         if (fragment < 0)
 449                 goto abort_negative;
 450         if (fragment >
 451             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
 452              << uspi->s_fpbshift))
 453                 goto abort_too_big;
 454
 455         err = 0;
 456         ptr = fragment;
 457
 458         /*
 459          * ok, these macros clean the logic up a bit and make
 460          * it much more readable:
 461          */
 462 #define GET_INODE_DATABLOCK(x) \
 463         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new, bh_result->b_page)
 464 #define GET_INODE_PTR(x) \
 465         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL, bh_result->b_page)
 466 #define GET_INDIRECT_DATABLOCK(x) \
 467         ufs_inode_getblock(inode, bh, x, fragment,      \
 468                           &err, &phys, &new, bh_result->b_page);
 469 #define GET_INDIRECT_PTR(x) \
 470         ufs_inode_getblock(inode, bh, x, fragment,      \
 471                           &err, NULL, NULL, bh_result->b_page);
 472
 473         if (ptr < UFS_NDIR_FRAGMENT) {
 474                 bh = GET_INODE_DATABLOCK(ptr);
 475                 goto out;
 476         }
 477         ptr -= UFS_NDIR_FRAGMENT;
 478         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
 479                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
 480                 goto get_indirect;
 481         }
 482         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 483         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
 484                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
 485                 goto get_double;
 486         }
 487         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 488         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
 489         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
 490 get_double:
 491         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 492 get_indirect:
 493         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
 494
 495 #undef GET_INODE_DATABLOCK
 496 #undef GET_INODE_PTR
 497 #undef GET_INDIRECT_DATABLOCK
 498 #undef GET_INDIRECT_PTR
 499
 500 out:
 501         if (err)
 502                 goto abort;
 503         if (new)
 504                 set_buffer_new(bh_result);
 505         map_bh(bh_result, sb, phys);
 506 abort:
 507         unlock_kernel();
 508         return err;
 509
 510 abort_negative:
 511         ufs_warning(sb, "ufs_get_block", "block < 0");
 512         goto abort;
 513
 514 abort_too_big:
 515         ufs_warning(sb, "ufs_get_block", "block > big");
 516         goto abort;
 517 }
 518
 519 static struct buffer_head *ufs_getfrag(struct inode *inode,
 520                                        unsigned int fragment,
 521                                        int create, int *err)
 522 {
 523         struct buffer_head dummy;
 524         int error;
 525
 526         dummy.b_state = 0;
 527         dummy.b_blocknr = -1000;
 528         error = ufs_getfrag_block(inode, fragment, &dummy, create);
 529         *err = error;
 530         if (!error && buffer_mapped(&dummy)) {
 531                 struct buffer_head *bh;
 532                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 533                 if (buffer_new(&dummy)) {
 534                         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 535                         set_buffer_uptodate(bh);
 536                         mark_buffer_dirty(bh);
 537                 }
 538                 return bh;
 539         }
 540         return NULL;
 541 }
 542
 543 struct buffer_head * ufs_bread (struct inode * inode, unsigned fragment,
 544         int create, int * err)
 545 {
 546         struct buffer_head * bh;
 547
 548         UFSD("ENTER, ino %lu, fragment %u\n", inode->i_ino, fragment);
 549         bh = ufs_getfrag (inode, fragment, create, err);
 550         if (!bh || buffer_uptodate(bh))
 551                 return bh;
 552         ll_rw_block (READ, 1, &bh);
 553         wait_on_buffer (bh);
 554         if (buffer_uptodate(bh))
 555                 return bh;
 556         brelse (bh);
 557         *err = -EIO;
 558         return NULL;
 559 }
 560
 561 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 562 {
 563         return block_write_full_page(page,ufs_getfrag_block,wbc);
 564 }
 565 static int ufs_readpage(struct file *file, struct page *page)
 566 {
 567         return block_read_full_page(page,ufs_getfrag_block);
 568 }
 569 static int ufs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 570 {
 571         return block_prepare_write(page,from,to,ufs_getfrag_block);
 572 }
 573 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 574 {
 575         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 576 }
 577 struct address_space_operations ufs_aops = {
 578         .readpage = ufs_readpage,
 579         .writepage = ufs_writepage,
 580         .sync_page = block_sync_page,
 581         .prepare_write = ufs_prepare_write,
 582         .commit_write = generic_commit_write,
 583         .bmap = ufs_bmap
 584 };
 585
 586 static void ufs_set_inode_ops(struct inode *inode)
 587 {
 588         if (S_ISREG(inode->i_mode)) {
 589                 inode->i_op = &ufs_file_inode_operations;
 590                 inode->i_fop = &ufs_file_operations;
 591                 inode->i_mapping->a_ops = &ufs_aops;
 592         } else if (S_ISDIR(inode->i_mode)) {
 593                 inode->i_op = &ufs_dir_inode_operations;
 594                 inode->i_fop = &ufs_dir_operations;
 595                 inode->i_mapping->a_ops = &ufs_aops;
 596         } else if (S_ISLNK(inode->i_mode)) {
 597                 if (!inode->i_blocks)
 598                         inode->i_op = &ufs_fast_symlink_inode_operations;
 599                 else {
 600                         inode->i_op = &page_symlink_inode_operations;
 601                         inode->i_mapping->a_ops = &ufs_aops;
 602                 }
 603         } else
 604                 init_special_inode(inode, inode->i_mode,
 605                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 606 }
 607
 608 void ufs_read_inode (struct inode * inode)
 609 {
 610         struct ufs_inode_info *ufsi = UFS_I(inode);
 611         struct super_block * sb;
 612         struct ufs_sb_private_info * uspi;
 613         struct ufs_inode * ufs_inode;
 614         struct ufs2_inode *ufs2_inode;
 615         struct buffer_head * bh;
 616         mode_t mode;
 617         unsigned i;
 618         unsigned flags;
 619
 620         UFSD("ENTER, ino %lu\n", inode->i_ino);
 621
 622         sb = inode->i_sb;
 623         uspi = UFS_SB(sb)->s_uspi;
 624         flags = UFS_SB(sb)->s_flags;
 625
 626         if (inode->i_ino < UFS_ROOTINO ||
 627             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 628                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 629                 goto bad_inode;
 630         }
 631
 632         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 633         if (!bh) {
 634                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 635                 goto bad_inode;
 636         }
 637         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 638                 goto ufs2_inode;
 639
 640         ufs_inode = (struct ufs_inode *) (bh->b_data + sizeof(struct ufs_inode) * ufs_inotofsbo(inode->i_ino));
 641
 642         /*
 643          * Copy data to the in-core inode.
 644          */
 645         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 646         inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
 647         if (inode->i_nlink == 0)
 648                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 649
 650         /*
 651          * Linux now has 32-bit uid and gid, so we can support EFT.
 652          */
 653         inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
 654         inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);
 655
 656         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 657         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 658         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 659         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 660         inode->i_mtime.tv_nsec = 0;
 661         inode->i_atime.tv_nsec = 0;
 662         inode->i_ctime.tv_nsec = 0;
 663         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 664         inode->i_blksize = PAGE_SIZE;   /* This is the optimal IO size (for stat) */
 665         inode->i_version++;
 666         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 667         ufsi->i_gen = fs32_to_cpu(sb, ufs_inode->ui_gen);
 668         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 669         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 670         ufsi->i_lastfrag = (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 671         ufsi->i_dir_start_lookup = 0;
 672
 673         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 674                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 675                         ufsi->i_u1.i_data[i] = ufs_inode->ui_u2.ui_addr.ui_db[i];
 676         } else {
 677                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 678                         ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
 679         }
 680         ufsi->i_osync = 0;
 681
 682         ufs_set_inode_ops(inode);
 683
 684         brelse (bh);
 685
 686         UFSD("EXIT\n");
 687         return;
 688
 689 bad_inode:
 690         make_bad_inode(inode);
 691         return;
 692
 693 ufs2_inode :
 694         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 695
 696         ufs2_inode = (struct ufs2_inode *)(bh->b_data + sizeof(struct ufs2_inode) * ufs_inotofsbo(inode->i_ino));
 697
 698         /*
 699          * Copy data to the in-core inode.
 700          */
 701         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 702         inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
 703         if (inode->i_nlink == 0)
 704                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 705
 706         /*
 707          * Linux now has 32-bit uid and gid, so we can support EFT.
 708          */
 709         inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
 710         inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
 711
 712         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 713         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_atime.tv_sec);
 714         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_ctime.tv_sec);
 715         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs2_inode->ui_mtime.tv_sec);
 716         inode->i_mtime.tv_nsec = 0;
 717         inode->i_atime.tv_nsec = 0;
 718         inode->i_ctime.tv_nsec = 0;
 719         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 720         inode->i_blksize = PAGE_SIZE; /*This is the optimal IO size(for stat)*/
 721
 722         inode->i_version++;
 723         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 724         ufsi->i_gen = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 725         /*
 726         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 727         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 728         */
 729         ufsi->i_lastfrag= (inode->i_size + uspi->s_fsize- 1) >> uspi->s_fshift;
 730
 731         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 732                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 733                         ufsi->i_u1.u2_i_data[i] =
 734                                 ufs2_inode->ui_u2.ui_addr.ui_db[i];
 735         }
 736         else {
 737                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 738                         ufsi->i_u1.i_symlink[i] = ufs2_inode->ui_u2.ui_symlink[i];
 739         }
 740         ufsi->i_osync = 0;
 741
 742         ufs_set_inode_ops(inode);
 743
 744         brelse(bh);
 745
 746         UFSD("EXIT\n");
 747         return;
 748 }
 749
 750 static int ufs_update_inode(struct inode * inode, int do_sync)
 751 {
 752         struct ufs_inode_info *ufsi = UFS_I(inode);
 753         struct super_block * sb;
 754         struct ufs_sb_private_info * uspi;
 755         struct buffer_head * bh;
 756         struct ufs_inode * ufs_inode;
 757         unsigned i;
 758         unsigned flags;
 759
 760         UFSD("ENTER, ino %lu\n", inode->i_ino);
 761
 762         sb = inode->i_sb;
 763         uspi = UFS_SB(sb)->s_uspi;
 764         flags = UFS_SB(sb)->s_flags;
 765
 766         if (inode->i_ino < UFS_ROOTINO ||
 767             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 768                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 769                 return -1;
 770         }
 771
 772         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 773         if (!bh) {
 774                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 775                 return -1;
 776         }
 777         ufs_inode = (struct ufs_inode *) (bh->b_data + ufs_inotofsbo(inode->i_ino) * sizeof(struct ufs_inode));
 778
 779         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 780         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 781
 782         ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
 783         ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
 784
 785         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 786         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 787         ufs_inode->ui_atime.tv_usec = 0;
 788         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 789         ufs_inode->ui_ctime.tv_usec = 0;
 790         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 791         ufs_inode->ui_mtime.tv_usec = 0;
 792         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 793         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 794         ufs_inode->ui_gen = cpu_to_fs32(sb, ufsi->i_gen);
 795
 796         if ((flags & UFS_UID_MASK) == UFS_UID_EFT) {
 797                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 798                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 799         }
 800
 801         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 802                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 803                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 804         } else if (inode->i_blocks) {
 805                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
 806                         ufs_inode->ui_u2.ui_addr.ui_db[i] = ufsi->i_u1.i_data[i];
 807         }
 808         else {
 809                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
 810                         ufs_inode->ui_u2.ui_symlink[i] = ufsi->i_u1.i_symlink[i];
 811         }
 812
 813         if (!inode->i_nlink)
 814                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 815
 816         mark_buffer_dirty(bh);
 817         if (do_sync)
 818                 sync_dirty_buffer(bh);
 819         brelse (bh);
 820
 821         UFSD("EXIT\n");
 822         return 0;
 823 }
 824
 825 int ufs_write_inode (struct inode * inode, int wait)
 826 {
 827         int ret;
 828         lock_kernel();
 829         ret = ufs_update_inode (inode, wait);
 830         unlock_kernel();
 831         return ret;
 832 }
 833
 834 int ufs_sync_inode (struct inode *inode)
 835 {
 836         return ufs_update_inode (inode, 1);
 837 }
 838
 839 void ufs_delete_inode (struct inode * inode)
 840 {
 841         truncate_inode_pages(&inode->i_data, 0);
 842         /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
 843         lock_kernel();
 844         mark_inode_dirty(inode);
 845         ufs_update_inode(inode, IS_SYNC(inode));
 846         inode->i_size = 0;
 847         if (inode->i_blocks)
 848                 ufs_truncate (inode);
 849         ufs_free_inode (inode);
 850         unlock_kernel();
 851 }