linux/fs/ufs/inode.c
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   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
  46static u64 ufs_frag_map(struct inode *inode, sector_t frag);
  47
  48static 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
  85static 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;
 131ufs2:
 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
 154out:
 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 */
 172static struct buffer_head *
 173ufs_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
 200repeat:
 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.
 302ufs2:
 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
 309repeat2:
 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 */
 329static struct buffer_head *
 330ufs_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;
 361repeat:
 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);
 404out:
 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
 415int 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);
 484get_double:
 485        bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 486get_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
 494out:
 495        if (err)
 496                goto abort;
 497        if (new)
 498                set_buffer_new(bh_result);
 499        map_bh(bh_result, sb, phys);
 500abort:
 501        unlock_kernel();
 502        return err;
 503
 504abort_too_big:
 505        ufs_warning(sb, "ufs_get_block", "block > big");
 506        goto abort;
 507}
 508
 509static 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
 533struct 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
 551static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 552{
 553        return block_write_full_page(page,ufs_getfrag_block,wbc);
 554}
 555
 556static int ufs_readpage(struct file *file, struct page *page)
 557{
 558        return block_read_full_page(page,ufs_getfrag_block);
 559}
 560
 561int 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
 566static 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
 583static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 584{
 585        return generic_block_bmap(mapping,block,ufs_getfrag_block);
 586}
 587
 588const struct address_space_operations ufs_aops = {
 589        .readpage = ufs_readpage,
 590        .writepage = ufs_writepage,
 591        .sync_page = block_sync_page,
 592        .write_begin = ufs_write_begin,
 593        .write_end = generic_write_end,
 594        .bmap = ufs_bmap
 595};
 596
 597static void ufs_set_inode_ops(struct inode *inode)
 598{
 599        if (S_ISREG(inode->i_mode)) {
 600                inode->i_op = &ufs_file_inode_operations;
 601                inode->i_fop = &ufs_file_operations;
 602                inode->i_mapping->a_ops = &ufs_aops;
 603        } else if (S_ISDIR(inode->i_mode)) {
 604                inode->i_op = &ufs_dir_inode_operations;
 605                inode->i_fop = &ufs_dir_operations;
 606                inode->i_mapping->a_ops = &ufs_aops;
 607        } else if (S_ISLNK(inode->i_mode)) {
 608                if (!inode->i_blocks)
 609                        inode->i_op = &ufs_fast_symlink_inode_operations;
 610                else {
 611                        inode->i_op = &ufs_symlink_inode_operations;
 612                        inode->i_mapping->a_ops = &ufs_aops;
 613                }
 614        } else
 615                init_special_inode(inode, inode->i_mode,
 616                                   ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 617}
 618
 619static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 620{
 621        struct ufs_inode_info *ufsi = UFS_I(inode);
 622        struct super_block *sb = inode->i_sb;
 623        mode_t mode;
 624
 625        /*
 626         * Copy data to the in-core inode.
 627         */
 628        inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 629        inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
 630        if (inode->i_nlink == 0) {
 631                ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 632                return -1;
 633        }
 634        
 635        /*
 636         * Linux now has 32-bit uid and gid, so we can support EFT.
 637         */
 638        inode->i_uid = ufs_get_inode_uid(sb, ufs_inode);
 639        inode->i_gid = ufs_get_inode_gid(sb, ufs_inode);
 640
 641        inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 642        inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 643        inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 644        inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 645        inode->i_mtime.tv_nsec = 0;
 646        inode->i_atime.tv_nsec = 0;
 647        inode->i_ctime.tv_nsec = 0;
 648        inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 649        inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 650        ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 651        ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 652        ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 653
 654        
 655        if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 656                memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 657                       sizeof(ufs_inode->ui_u2.ui_addr));
 658        } else {
 659                memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 660                       sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 661                ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 662        }
 663        return 0;
 664}
 665
 666static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 667{
 668        struct ufs_inode_info *ufsi = UFS_I(inode);
 669        struct super_block *sb = inode->i_sb;
 670        mode_t mode;
 671
 672        UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 673        /*
 674         * Copy data to the in-core inode.
 675         */
 676        inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 677        inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
 678        if (inode->i_nlink == 0) {
 679                ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 680                return -1;
 681        }
 682
 683        /*
 684         * Linux now has 32-bit uid and gid, so we can support EFT.
 685         */
 686        inode->i_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
 687        inode->i_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
 688
 689        inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 690        inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 691        inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 692        inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 693        inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 694        inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 695        inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 696        inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 697        inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 698        ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 699        /*
 700        ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 701        ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 702        */
 703
 704        if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 705                memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 706                       sizeof(ufs2_inode->ui_u2.ui_addr));
 707        } else {
 708                memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 709                       sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 710                ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 711        }
 712        return 0;
 713}
 714
 715struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 716{
 717        struct ufs_inode_info *ufsi;
 718        struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 719        struct buffer_head * bh;
 720        struct inode *inode;
 721        int err;
 722
 723        UFSD("ENTER, ino %lu\n", ino);
 724
 725        if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 726                ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 727                            ino);
 728                return ERR_PTR(-EIO);
 729        }
 730
 731        inode = iget_locked(sb, ino);
 732        if (!inode)
 733                return ERR_PTR(-ENOMEM);
 734        if (!(inode->i_state & I_NEW))
 735                return inode;
 736
 737        ufsi = UFS_I(inode);
 738
 739        bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 740        if (!bh) {
 741                ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 742                            inode->i_ino);
 743                goto bad_inode;
 744        }
 745        if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 746                struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 747
 748                err = ufs2_read_inode(inode,
 749                                      ufs2_inode + ufs_inotofsbo(inode->i_ino));
 750        } else {
 751                struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 752
 753                err = ufs1_read_inode(inode,
 754                                      ufs_inode + ufs_inotofsbo(inode->i_ino));
 755        }
 756
 757        if (err)
 758                goto bad_inode;
 759        inode->i_version++;
 760        ufsi->i_lastfrag =
 761                (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 762        ufsi->i_dir_start_lookup = 0;
 763        ufsi->i_osync = 0;
 764
 765        ufs_set_inode_ops(inode);
 766
 767        brelse(bh);
 768
 769        UFSD("EXIT\n");
 770        unlock_new_inode(inode);
 771        return inode;
 772
 773bad_inode:
 774        iget_failed(inode);
 775        return ERR_PTR(-EIO);
 776}
 777
 778static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 779{
 780        struct super_block *sb = inode->i_sb;
 781        struct ufs_inode_info *ufsi = UFS_I(inode);
 782
 783        ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 784        ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 785
 786        ufs_set_inode_uid(sb, ufs_inode, inode->i_uid);
 787        ufs_set_inode_gid(sb, ufs_inode, inode->i_gid);
 788                
 789        ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 790        ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 791        ufs_inode->ui_atime.tv_usec = 0;
 792        ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 793        ufs_inode->ui_ctime.tv_usec = 0;
 794        ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 795        ufs_inode->ui_mtime.tv_usec = 0;
 796        ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 797        ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 798        ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 799
 800        if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 801                ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 802                ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 803        }
 804
 805        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 806                /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 807                ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 808        } else if (inode->i_blocks) {
 809                memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 810                       sizeof(ufs_inode->ui_u2.ui_addr));
 811        }
 812        else {
 813                memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 814                       sizeof(ufs_inode->ui_u2.ui_symlink));
 815        }
 816
 817        if (!inode->i_nlink)
 818                memset (ufs_inode, 0, sizeof(struct ufs_inode));
 819}
 820
 821static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 822{
 823        struct super_block *sb = inode->i_sb;
 824        struct ufs_inode_info *ufsi = UFS_I(inode);
 825
 826        UFSD("ENTER\n");
 827        ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 828        ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 829
 830        ufs_inode->ui_uid = cpu_to_fs32(sb, inode->i_uid);
 831        ufs_inode->ui_gid = cpu_to_fs32(sb, inode->i_gid);
 832
 833        ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 834        ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 835        ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 836        ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 837        ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 838        ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 839        ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 840
 841        ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 842        ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 843        ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 844
 845        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 846                /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 847                ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 848        } else if (inode->i_blocks) {
 849                memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 850                       sizeof(ufs_inode->ui_u2.ui_addr));
 851        } else {
 852                memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 853                       sizeof(ufs_inode->ui_u2.ui_symlink));
 854        }
 855
 856        if (!inode->i_nlink)
 857                memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 858        UFSD("EXIT\n");
 859}
 860
 861static int ufs_update_inode(struct inode * inode, int do_sync)
 862{
 863        struct super_block *sb = inode->i_sb;
 864        struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 865        struct buffer_head * bh;
 866
 867        UFSD("ENTER, ino %lu\n", inode->i_ino);
 868
 869        if (inode->i_ino < UFS_ROOTINO ||
 870            inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 871                ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 872                return -1;
 873        }
 874
 875        bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 876        if (!bh) {
 877                ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 878                return -1;
 879        }
 880        if (uspi->fs_magic == UFS2_MAGIC) {
 881                struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 882
 883                ufs2_update_inode(inode,
 884                                  ufs2_inode + ufs_inotofsbo(inode->i_ino));
 885        } else {
 886                struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 887
 888                ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 889        }
 890                
 891        mark_buffer_dirty(bh);
 892        if (do_sync)
 893                sync_dirty_buffer(bh);
 894        brelse (bh);
 895        
 896        UFSD("EXIT\n");
 897        return 0;
 898}
 899
 900int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 901{
 902        int ret;
 903        lock_kernel();
 904        ret = ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 905        unlock_kernel();
 906        return ret;
 907}
 908
 909int ufs_sync_inode (struct inode *inode)
 910{
 911        return ufs_update_inode (inode, 1);
 912}
 913
 914void ufs_evict_inode(struct inode * inode)
 915{
 916        int want_delete = 0;
 917
 918        if (!inode->i_nlink && !is_bad_inode(inode))
 919                want_delete = 1;
 920
 921        truncate_inode_pages(&inode->i_data, 0);
 922        if (want_delete) {
 923                loff_t old_i_size;
 924                /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
 925                lock_kernel();
 926                mark_inode_dirty(inode);
 927                ufs_update_inode(inode, IS_SYNC(inode));
 928                old_i_size = inode->i_size;
 929                inode->i_size = 0;
 930                if (inode->i_blocks && ufs_truncate(inode, old_i_size))
 931                        ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
 932                unlock_kernel();
 933        }
 934
 935        invalidate_inode_buffers(inode);
 936        end_writeback(inode);
 937
 938        if (want_delete) {
 939                lock_kernel();
 940                ufs_free_inode (inode);
 941                unlock_kernel();
 942        }
 943}
 944