fs/ufs/inode.c

   1 /*
   2  *  linux/fs/ufs/inode.c
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  *
   8  *  from
   9  *
  10  *  linux/fs/ext2/inode.c
  11  *
  12  * Copyright (C) 1992, 1993, 1994, 1995
  13  * Remy Card (card@masi.ibp.fr)
  14  * Laboratoire MASI - Institut Blaise Pascal
  15  * Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *  from
  18  *
  19  *  linux/fs/minix/inode.c
  20  *
  21  *  Copyright (C) 1991, 1992  Linus Torvalds
  22  *
  23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  24  *  Big-endian to little-endian byte-swapping/bitmaps by
  25  *        David S. Miller (davem@caip.rutgers.edu), 1995
  26  */
  27
  28 #include <asm/uaccess.h>
  29
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/time.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38
  39 #include "ufs_fs.h"
  40 #include "ufs.h"
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  45 {
  46         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  47         int ptrs = uspi->s_apb;
  48         int ptrs_bits = uspi->s_apbshift;
  49         const long direct_blocks = UFS_NDADDR,
  50                 indirect_blocks = ptrs,
  51                 double_blocks = (1 << (ptrs_bits * 2));
  52         int n = 0;
  53
  54
  55         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  56         if (i_block < direct_blocks) {
  57                 offsets[n++] = i_block;
  58         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  59                 offsets[n++] = UFS_IND_BLOCK;
  60                 offsets[n++] = i_block;
  61         } else if ((i_block -= indirect_blocks) < double_blocks) {
  62                 offsets[n++] = UFS_DIND_BLOCK;
  63                 offsets[n++] = i_block >> ptrs_bits;
  64                 offsets[n++] = i_block & (ptrs - 1);
  65         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  66                 offsets[n++] = UFS_TIND_BLOCK;
  67                 offsets[n++] = i_block >> (ptrs_bits * 2);
  68                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  69                 offsets[n++] = i_block & (ptrs - 1);
  70         } else {
  71                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  72         }
  73         return n;
  74 }
  75
  76 typedef struct {
  77         void    *p;
  78         union {
  79                 __fs32  key32;
  80                 __fs64  key64;
  81         };
  82         struct buffer_head *bh;
  83 } Indirect;
  84
  85 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  86                                struct buffer_head *bh, __fs32 *v,
  87                                Indirect *from, Indirect *to)
  88 {
  89         Indirect *p;
  90         unsigned seq;
  91         to->bh = bh;
  92         do {
  93                 seq = read_seqbegin(&ufsi->meta_lock);
  94                 to->key32 = *(__fs32 *)(to->p = v);
  95                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  96                         ;
  97         } while (read_seqretry(&ufsi->meta_lock, seq));
  98         return (p > to);
  99 }
 100
 101 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 102                                struct buffer_head *bh, __fs64 *v,
 103                                Indirect *from, Indirect *to)
 104 {
 105         Indirect *p;
 106         unsigned seq;
 107         to->bh = bh;
 108         do {
 109                 seq = read_seqbegin(&ufsi->meta_lock);
 110                 to->key64 = *(__fs64 *)(to->p = v);
 111                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 112                         ;
 113         } while (read_seqretry(&ufsi->meta_lock, seq));
 114         return (p > to);
 115 }
 116
 117 /*
 118  * Returns the location of the fragment from
 119  * the beginning of the filesystem.
 120  */
 121
 122 static u64 ufs_frag_map(struct inode *inode, sector_t frag)
 123 {
 124         struct ufs_inode_info *ufsi = UFS_I(inode);
 125         struct super_block *sb = inode->i_sb;
 126         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 127         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 128         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 129         unsigned offsets[4], *p;
 130         Indirect chain[4], *q = chain;
 131         int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
 132         unsigned flags = UFS_SB(sb)->s_flags;
 133         u64 res = 0;
 134
 135         UFSD(": frag = %llu  depth = %d\n", (unsigned long long)frag, depth);
 136         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 137                 uspi->s_fpbshift, uspi->s_apbmask,
 138                 (unsigned long long)mask);
 139
 140         if (depth == 0)
 141                 goto no_block;
 142
 143 again:
 144         p = offsets;
 145
 146         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 147                 goto ufs2;
 148
 149         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 150                 goto changed;
 151         if (!q->key32)
 152                 goto no_block;
 153         while (--depth) {
 154                 __fs32 *ptr;
 155                 struct buffer_head *bh;
 156                 unsigned n = *p++;
 157
 158                 bh = sb_bread(sb, uspi->s_sbbase +
 159                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 160                 if (!bh)
 161                         goto no_block;
 162                 ptr = (__fs32 *)bh->b_data + (n & mask);
 163                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 164                         goto changed;
 165                 if (!q->key32)
 166                         goto no_block;
 167         }
 168         res = fs32_to_cpu(sb, q->key32);
 169         goto found;
 170
 171 ufs2:
 172         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 173                 goto changed;
 174         if (!q->key64)
 175                 goto no_block;
 176
 177         while (--depth) {
 178                 __fs64 *ptr;
 179                 struct buffer_head *bh;
 180                 unsigned n = *p++;
 181
 182                 bh = sb_bread(sb, uspi->s_sbbase +
 183                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 184                 if (!bh)
 185                         goto no_block;
 186                 ptr = (__fs64 *)bh->b_data + (n & mask);
 187                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 188                         goto changed;
 189                 if (!q->key64)
 190                         goto no_block;
 191         }
 192         res = fs64_to_cpu(sb, q->key64);
 193 found:
 194         res += uspi->s_sbbase + (frag & uspi->s_fpbmask);
 195 no_block:
 196         while (q > chain) {
 197                 brelse(q->bh);
 198                 q--;
 199         }
 200         return res;
 201
 202 changed:
 203         while (q > chain) {
 204                 brelse(q->bh);
 205                 q--;
 206         }
 207         goto again;
 208 }
 209
 210 /**
 211  * ufs_inode_getfrag() - allocate new fragment(s)
 212  * @inode: pointer to inode
 213  * @fragment: number of `fragment' which hold pointer
 214  *   to new allocated fragment(s)
 215  * @new_fragment: number of new allocated fragment(s)
 216  * @required: how many fragment(s) we require
 217  * @err: we set it if something wrong
 218  * @phys: pointer to where we save physical number of new allocated fragments,
 219  *   NULL if we allocate not data(indirect blocks for example).
 220  * @new: we set it if we allocate new block
 221  * @locked_page: for ufs_new_fragments()
 222  */
 223 static struct buffer_head *
 224 ufs_inode_getfrag(struct inode *inode, u64 fragment,
 225                   sector_t new_fragment, unsigned int required, int *err,
 226                   long *phys, int *new, struct page *locked_page)
 227 {
 228         struct ufs_inode_info *ufsi = UFS_I(inode);
 229         struct super_block *sb = inode->i_sb;
 230         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 231         struct buffer_head * result;
 232         unsigned blockoff, lastblockoff;
 233         u64 tmp, goal, lastfrag, block, lastblock;
 234         void *p, *p2;
 235
 236         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
 237              "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
 238              (unsigned long long)new_fragment, required, !phys);
 239
 240         /* TODO : to be done for write support
 241         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 242              goto ufs2;
 243          */
 244
 245         block = ufs_fragstoblks (fragment);
 246         blockoff = ufs_fragnum (fragment);
 247         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 248
 249         goal = 0;
 250
 251 repeat:
 252         tmp = ufs_data_ptr_to_cpu(sb, p);
 253
 254         lastfrag = ufsi->i_lastfrag;
 255         if (tmp && fragment < lastfrag) {
 256                 if (!phys) {
 257                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 258                         if (tmp == ufs_data_ptr_to_cpu(sb, p)) {
 259                                 UFSD("EXIT, result %llu\n",
 260                                      (unsigned long long)tmp + blockoff);
 261                                 return result;
 262                         }
 263                         brelse (result);
 264                         goto repeat;
 265                 } else {
 266                         *phys = uspi->s_sbbase + tmp + blockoff;
 267                         return NULL;
 268                 }
 269         }
 270
 271         lastblock = ufs_fragstoblks (lastfrag);
 272         lastblockoff = ufs_fragnum (lastfrag);
 273         /*
 274          * We will extend file into new block beyond last allocated block
 275          */
 276         if (lastblock < block) {
 277                 /*
 278                  * We must reallocate last allocated block
 279                  */
 280                 if (lastblockoff) {
 281                         p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
 282                         tmp = ufs_new_fragments(inode, p2, lastfrag,
 283                                                 ufs_data_ptr_to_cpu(sb, p2),
 284                                                 uspi->s_fpb - lastblockoff,
 285                                                 err, locked_page);
 286                         if (!tmp) {
 287                                 if (lastfrag != ufsi->i_lastfrag)
 288                                         goto repeat;
 289                                 else
 290                                         return NULL;
 291                         }
 292                         lastfrag = ufsi->i_lastfrag;
 293
 294                 }
 295                 tmp = ufs_data_ptr_to_cpu(sb,
 296                                          ufs_get_direct_data_ptr(uspi, ufsi,
 297                                                                  lastblock));
 298                 if (tmp)
 299                         goal = tmp + uspi->s_fpb;
 300                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 301                                          goal, required + blockoff,
 302                                          err,
 303                                          phys != NULL ? locked_page : NULL);
 304         } else if (lastblock == block) {
 305         /*
 306          * We will extend last allocated block
 307          */
 308                 tmp = ufs_new_fragments(inode, p, fragment -
 309                                         (blockoff - lastblockoff),
 310                                         ufs_data_ptr_to_cpu(sb, p),
 311                                         required +  (blockoff - lastblockoff),
 312                                         err, phys != NULL ? locked_page : NULL);
 313         } else /* (lastblock > block) */ {
 314         /*
 315          * We will allocate new block before last allocated block
 316          */
 317                 if (block) {
 318                         tmp = ufs_data_ptr_to_cpu(sb,
 319                                                  ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
 320                         if (tmp)
 321                                 goal = tmp + uspi->s_fpb;
 322                 }
 323                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 324                                         goal, uspi->s_fpb, err,
 325                                         phys != NULL ? locked_page : NULL);
 326         }
 327         if (!tmp) {
 328                 if ((!blockoff && ufs_data_ptr_to_cpu(sb, p)) ||
 329                     (blockoff && lastfrag != ufsi->i_lastfrag))
 330                         goto repeat;
 331                 *err = -ENOSPC;
 332                 return NULL;
 333         }
 334
 335         if (!phys) {
 336                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 337         } else {
 338                 *phys = uspi->s_sbbase + tmp + blockoff;
 339                 result = NULL;
 340                 *err = 0;
 341                 *new = 1;
 342         }
 343
 344         inode->i_ctime = CURRENT_TIME_SEC;
 345         if (IS_SYNC(inode))
 346                 ufs_sync_inode (inode);
 347         mark_inode_dirty(inode);
 348         UFSD("EXIT, result %llu\n", (unsigned long long)tmp + blockoff);
 349         return result;
 350
 351      /* This part : To be implemented ....
 352         Required only for writing, not required for READ-ONLY.
 353 ufs2:
 354
 355         u2_block = ufs_fragstoblks(fragment);
 356         u2_blockoff = ufs_fragnum(fragment);
 357         p = ufsi->i_u1.u2_i_data + block;
 358         goal = 0;
 359
 360 repeat2:
 361         tmp = fs32_to_cpu(sb, *p);
 362         lastfrag = ufsi->i_lastfrag;
 363
 364      */
 365 }
 366
 367 /**
 368  * ufs_inode_getblock() - allocate new block
 369  * @inode: pointer to inode
 370  * @bh: pointer to block which hold "pointer" to new allocated block
 371  * @fragment: number of `fragment' which hold pointer
 372  *   to new allocated block
 373  * @new_fragment: number of new allocated fragment
 374  *  (block will hold this fragment and also uspi->s_fpb-1)
 375  * @err: see ufs_inode_getfrag()
 376  * @phys: see ufs_inode_getfrag()
 377  * @new: see ufs_inode_getfrag()
 378  * @locked_page: see ufs_inode_getfrag()
 379  */
 380 static struct buffer_head *
 381 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 382                   u64 fragment, sector_t new_fragment, int *err,
 383                   long *phys, int *new, struct page *locked_page)
 384 {
 385         struct super_block *sb = inode->i_sb;
 386         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 387         struct buffer_head * result;
 388         unsigned blockoff;
 389         u64 tmp, goal, block;
 390         void *p;
 391
 392         block = ufs_fragstoblks (fragment);
 393         blockoff = ufs_fragnum (fragment);
 394
 395         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, metadata %d\n",
 396              inode->i_ino, (unsigned long long)fragment,
 397              (unsigned long long)new_fragment, !phys);
 398
 399         result = NULL;
 400         if (!bh)
 401                 goto out;
 402         if (!buffer_uptodate(bh)) {
 403                 ll_rw_block (READ, 1, &bh);
 404                 wait_on_buffer (bh);
 405                 if (!buffer_uptodate(bh))
 406                         goto out;
 407         }
 408         if (uspi->fs_magic == UFS2_MAGIC)
 409                 p = (__fs64 *)bh->b_data + block;
 410         else
 411                 p = (__fs32 *)bh->b_data + block;
 412 repeat:
 413         tmp = ufs_data_ptr_to_cpu(sb, p);
 414         if (tmp) {
 415                 if (!phys) {
 416                         result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 417                         if (tmp == ufs_data_ptr_to_cpu(sb, p))
 418                                 goto out;
 419                         brelse (result);
 420                         goto repeat;
 421                 } else {
 422                         *phys = uspi->s_sbbase + tmp + blockoff;
 423                         goto out;
 424                 }
 425         }
 426
 427         if (block && (uspi->fs_magic == UFS2_MAGIC ?
 428                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[block-1])) :
 429                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[block-1]))))
 430                 goal = tmp + uspi->s_fpb;
 431         else
 432                 goal = bh->b_blocknr + uspi->s_fpb;
 433         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 434                                 uspi->s_fpb, err, locked_page);
 435         if (!tmp) {
 436                 if (ufs_data_ptr_to_cpu(sb, p))
 437                         goto repeat;
 438                 goto out;
 439         }
 440
 441
 442         if (!phys) {
 443                 result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 444         } else {
 445                 *phys = uspi->s_sbbase + tmp + blockoff;
 446                 *new = 1;
 447         }
 448
 449         mark_buffer_dirty(bh);
 450         if (IS_SYNC(inode))
 451                 sync_dirty_buffer(bh);
 452         inode->i_ctime = CURRENT_TIME_SEC;
 453         mark_inode_dirty(inode);
 454         UFSD("result %llu\n", (unsigned long long)tmp + blockoff);
 455 out:
 456         brelse (bh);
 457         UFSD("EXIT\n");
 458         return result;
 459 }
 460
 461 /**
 462  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 463  * readpage, writepage and so on
 464  */
 465
 466 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 467 {
 468         struct super_block * sb = inode->i_sb;
 469         struct ufs_sb_info * sbi = UFS_SB(sb);
 470         struct ufs_sb_private_info * uspi = sbi->s_uspi;
 471         struct buffer_head * bh;
 472         int ret, err, new;
 473         unsigned long ptr,phys;
 474         u64 phys64 = 0;
 475
 476         if (!create) {
 477                 phys64 = ufs_frag_map(inode, fragment);
 478                 UFSD("phys64 = %llu\n", (unsigned long long)phys64);
 479                 if (phys64)
 480                         map_bh(bh_result, sb, phys64);
 481                 return 0;
 482         }
 483
 484         /* This code entered only while writing ....? */
 485
 486         err = -EIO;
 487         new = 0;
 488         ret = 0;
 489         bh = NULL;
 490
 491         mutex_lock(&UFS_I(inode)->truncate_mutex);
 492
 493         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 494         if (fragment >
 495             ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
 496              << uspi->s_fpbshift))
 497                 goto abort_too_big;
 498
 499         err = 0;
 500         ptr = fragment;
 501
 502         /*
 503          * ok, these macros clean the logic up a bit and make
 504          * it much more readable:
 505          */
 506 #define GET_INODE_DATABLOCK(x) \
 507         ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new,\
 508                           bh_result->b_page)
 509 #define GET_INODE_PTR(x) \
 510         ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL,\
 511                           bh_result->b_page)
 512 #define GET_INDIRECT_DATABLOCK(x) \
 513         ufs_inode_getblock(inode, bh, x, fragment,      \
 514                           &err, &phys, &new, bh_result->b_page)
 515 #define GET_INDIRECT_PTR(x) \
 516         ufs_inode_getblock(inode, bh, x, fragment,      \
 517                           &err, NULL, NULL, NULL)
 518
 519         if (ptr < UFS_NDIR_FRAGMENT) {
 520                 bh = GET_INODE_DATABLOCK(ptr);
 521                 goto out;
 522         }
 523         ptr -= UFS_NDIR_FRAGMENT;
 524         if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
 525                 bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
 526                 goto get_indirect;
 527         }
 528         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 529         if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
 530                 bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
 531                 goto get_double;
 532         }
 533         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 534         bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
 535         bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
 536 get_double:
 537         bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
 538 get_indirect:
 539         bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);
 540
 541 #undef GET_INODE_DATABLOCK
 542 #undef GET_INODE_PTR
 543 #undef GET_INDIRECT_DATABLOCK
 544 #undef GET_INDIRECT_PTR
 545
 546 out:
 547         if (err)
 548                 goto abort;
 549         if (new)
 550                 set_buffer_new(bh_result);
 551         map_bh(bh_result, sb, phys);
 552 abort:
 553         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 554
 555         return err;
 556
 557 abort_too_big:
 558         ufs_warning(sb, "ufs_get_block", "block > big");
 559         goto abort;
 560 }
 561
 562 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 563 {
 564         return block_write_full_page(page,ufs_getfrag_block,wbc);
 565 }
 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
 572 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 573 {
 574         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 575 }
 576
 577 static void ufs_truncate_blocks(struct inode *);
 578
 579 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 580 {
 581         struct inode *inode = mapping->host;
 582
 583         if (to > inode->i_size) {
 584                 truncate_pagecache(inode, inode->i_size);
 585                 ufs_truncate_blocks(inode);
 586         }
 587 }
 588
 589 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 590                         loff_t pos, unsigned len, unsigned flags,
 591                         struct page **pagep, void **fsdata)
 592 {
 593         int ret;
 594
 595         ret = block_write_begin(mapping, pos, len, flags, pagep,
 596                                 ufs_getfrag_block);
 597         if (unlikely(ret))
 598                 ufs_write_failed(mapping, pos + len);
 599
 600         return ret;
 601 }
 602
 603 static int ufs_write_end(struct file *file, struct address_space *mapping,
 604                         loff_t pos, unsigned len, unsigned copied,
 605                         struct page *page, void *fsdata)
 606 {
 607         int ret;
 608
 609         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 610         if (ret < len)
 611                 ufs_write_failed(mapping, pos + len);
 612         return ret;
 613 }
 614
 615 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 616 {
 617         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 618 }
 619
 620 const struct address_space_operations ufs_aops = {
 621         .readpage = ufs_readpage,
 622         .writepage = ufs_writepage,
 623         .write_begin = ufs_write_begin,
 624         .write_end = ufs_write_end,
 625         .bmap = ufs_bmap
 626 };
 627
 628 static void ufs_set_inode_ops(struct inode *inode)
 629 {
 630         if (S_ISREG(inode->i_mode)) {
 631                 inode->i_op = &ufs_file_inode_operations;
 632                 inode->i_fop = &ufs_file_operations;
 633                 inode->i_mapping->a_ops = &ufs_aops;
 634         } else if (S_ISDIR(inode->i_mode)) {
 635                 inode->i_op = &ufs_dir_inode_operations;
 636                 inode->i_fop = &ufs_dir_operations;
 637                 inode->i_mapping->a_ops = &ufs_aops;
 638         } else if (S_ISLNK(inode->i_mode)) {
 639                 if (!inode->i_blocks) {
 640                         inode->i_op = &ufs_fast_symlink_inode_operations;
 641                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 642                 } else {
 643                         inode->i_op = &ufs_symlink_inode_operations;
 644                         inode->i_mapping->a_ops = &ufs_aops;
 645                 }
 646         } else
 647                 init_special_inode(inode, inode->i_mode,
 648                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 649 }
 650
 651 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 652 {
 653         struct ufs_inode_info *ufsi = UFS_I(inode);
 654         struct super_block *sb = inode->i_sb;
 655         umode_t mode;
 656
 657         /*
 658          * Copy data to the in-core inode.
 659          */
 660         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 661         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 662         if (inode->i_nlink == 0) {
 663                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 664                 return -1;
 665         }
 666
 667         /*
 668          * Linux now has 32-bit uid and gid, so we can support EFT.
 669          */
 670         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 671         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 672
 673         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 674         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 675         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 676         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 677         inode->i_mtime.tv_nsec = 0;
 678         inode->i_atime.tv_nsec = 0;
 679         inode->i_ctime.tv_nsec = 0;
 680         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 681         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 682         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 683         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 684         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 685
 686
 687         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 688                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 689                        sizeof(ufs_inode->ui_u2.ui_addr));
 690         } else {
 691                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 692                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 693                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 694         }
 695         return 0;
 696 }
 697
 698 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 699 {
 700         struct ufs_inode_info *ufsi = UFS_I(inode);
 701         struct super_block *sb = inode->i_sb;
 702         umode_t mode;
 703
 704         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 705         /*
 706          * Copy data to the in-core inode.
 707          */
 708         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 709         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 710         if (inode->i_nlink == 0) {
 711                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 712                 return -1;
 713         }
 714
 715         /*
 716          * Linux now has 32-bit uid and gid, so we can support EFT.
 717          */
 718         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 719         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 720
 721         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 722         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 723         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 724         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 725         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 726         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 727         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 728         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 729         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 730         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 731         /*
 732         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 733         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 734         */
 735
 736         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 737                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 738                        sizeof(ufs2_inode->ui_u2.ui_addr));
 739         } else {
 740                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 741                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 742                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 743         }
 744         return 0;
 745 }
 746
 747 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 748 {
 749         struct ufs_inode_info *ufsi;
 750         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 751         struct buffer_head * bh;
 752         struct inode *inode;
 753         int err;
 754
 755         UFSD("ENTER, ino %lu\n", ino);
 756
 757         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 758                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 759                             ino);
 760                 return ERR_PTR(-EIO);
 761         }
 762
 763         inode = iget_locked(sb, ino);
 764         if (!inode)
 765                 return ERR_PTR(-ENOMEM);
 766         if (!(inode->i_state & I_NEW))
 767                 return inode;
 768
 769         ufsi = UFS_I(inode);
 770
 771         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 772         if (!bh) {
 773                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 774                             inode->i_ino);
 775                 goto bad_inode;
 776         }
 777         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 778                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 779
 780                 err = ufs2_read_inode(inode,
 781                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 782         } else {
 783                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 784
 785                 err = ufs1_read_inode(inode,
 786                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 787         }
 788
 789         if (err)
 790                 goto bad_inode;
 791         inode->i_version++;
 792         ufsi->i_lastfrag =
 793                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 794         ufsi->i_dir_start_lookup = 0;
 795         ufsi->i_osync = 0;
 796
 797         ufs_set_inode_ops(inode);
 798
 799         brelse(bh);
 800
 801         UFSD("EXIT\n");
 802         unlock_new_inode(inode);
 803         return inode;
 804
 805 bad_inode:
 806         iget_failed(inode);
 807         return ERR_PTR(-EIO);
 808 }
 809
 810 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 811 {
 812         struct super_block *sb = inode->i_sb;
 813         struct ufs_inode_info *ufsi = UFS_I(inode);
 814
 815         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 816         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 817
 818         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 819         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 820
 821         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 822         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 823         ufs_inode->ui_atime.tv_usec = 0;
 824         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 825         ufs_inode->ui_ctime.tv_usec = 0;
 826         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 827         ufs_inode->ui_mtime.tv_usec = 0;
 828         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 829         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 830         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 831
 832         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 833                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 834                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 835         }
 836
 837         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 838                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 839                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 840         } else if (inode->i_blocks) {
 841                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 842                        sizeof(ufs_inode->ui_u2.ui_addr));
 843         }
 844         else {
 845                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 846                        sizeof(ufs_inode->ui_u2.ui_symlink));
 847         }
 848
 849         if (!inode->i_nlink)
 850                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 851 }
 852
 853 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 854 {
 855         struct super_block *sb = inode->i_sb;
 856         struct ufs_inode_info *ufsi = UFS_I(inode);
 857
 858         UFSD("ENTER\n");
 859         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 860         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 861
 862         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 863         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 864
 865         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 866         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 867         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 868         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 869         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 870         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 871         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 872
 873         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 874         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 875         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 876
 877         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 878                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 879                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 880         } else if (inode->i_blocks) {
 881                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 882                        sizeof(ufs_inode->ui_u2.ui_addr));
 883         } else {
 884                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 885                        sizeof(ufs_inode->ui_u2.ui_symlink));
 886         }
 887
 888         if (!inode->i_nlink)
 889                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 890         UFSD("EXIT\n");
 891 }
 892
 893 static int ufs_update_inode(struct inode * inode, int do_sync)
 894 {
 895         struct super_block *sb = inode->i_sb;
 896         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 897         struct buffer_head * bh;
 898
 899         UFSD("ENTER, ino %lu\n", inode->i_ino);
 900
 901         if (inode->i_ino < UFS_ROOTINO ||
 902             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 903                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 904                 return -1;
 905         }
 906
 907         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 908         if (!bh) {
 909                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 910                 return -1;
 911         }
 912         if (uspi->fs_magic == UFS2_MAGIC) {
 913                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 914
 915                 ufs2_update_inode(inode,
 916                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 917         } else {
 918                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 919
 920                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 921         }
 922
 923         mark_buffer_dirty(bh);
 924         if (do_sync)
 925                 sync_dirty_buffer(bh);
 926         brelse (bh);
 927
 928         UFSD("EXIT\n");
 929         return 0;
 930 }
 931
 932 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 933 {
 934         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 935 }
 936
 937 int ufs_sync_inode (struct inode *inode)
 938 {
 939         return ufs_update_inode (inode, 1);
 940 }
 941
 942 void ufs_evict_inode(struct inode * inode)
 943 {
 944         int want_delete = 0;
 945
 946         if (!inode->i_nlink && !is_bad_inode(inode))
 947                 want_delete = 1;
 948
 949         truncate_inode_pages_final(&inode->i_data);
 950         if (want_delete) {
 951                 inode->i_size = 0;
 952                 if (inode->i_blocks)
 953                         ufs_truncate_blocks(inode);
 954         }
 955
 956         invalidate_inode_buffers(inode);
 957         clear_inode(inode);
 958
 959         if (want_delete)
 960                 ufs_free_inode(inode);
 961 }
 962
 963 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 964 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 965
 966 static void ufs_trunc_direct(struct inode *inode)
 967 {
 968         struct ufs_inode_info *ufsi = UFS_I(inode);
 969         struct super_block * sb;
 970         struct ufs_sb_private_info * uspi;
 971         void *p;
 972         u64 frag1, frag2, frag3, frag4, block1, block2;
 973         unsigned frag_to_free, free_count;
 974         unsigned i, tmp;
 975
 976         UFSD("ENTER: ino %lu\n", inode->i_ino);
 977
 978         sb = inode->i_sb;
 979         uspi = UFS_SB(sb)->s_uspi;
 980
 981         frag_to_free = 0;
 982         free_count = 0;
 983
 984         frag1 = DIRECT_FRAGMENT;
 985         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 986         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 987         frag3 = frag4 & ~uspi->s_fpbmask;
 988         block1 = block2 = 0;
 989         if (frag2 > frag3) {
 990                 frag2 = frag4;
 991                 frag3 = frag4 = 0;
 992         } else if (frag2 < frag3) {
 993                 block1 = ufs_fragstoblks (frag2);
 994                 block2 = ufs_fragstoblks (frag3);
 995         }
 996
 997         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 998              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 999              (unsigned long long)frag1, (unsigned long long)frag2,
1000              (unsigned long long)block1, (unsigned long long)block2,
1001              (unsigned long long)frag3, (unsigned long long)frag4);
1002
1003         if (frag1 >= frag2)
1004                 goto next1;
1005
1006         /*
1007          * Free first free fragments
1008          */
1009         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
1010         tmp = ufs_data_ptr_to_cpu(sb, p);
1011         if (!tmp )
1012                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
1013         frag2 -= frag1;
1014         frag1 = ufs_fragnum (frag1);
1015
1016         ufs_free_fragments(inode, tmp + frag1, frag2);
1017         mark_inode_dirty(inode);
1018         frag_to_free = tmp + frag1;
1019
1020 next1:
1021         /*
1022          * Free whole blocks
1023          */
1024         for (i = block1 ; i < block2; i++) {
1025                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1026                 tmp = ufs_data_ptr_to_cpu(sb, p);
1027                 if (!tmp)
1028                         continue;
1029                 write_seqlock(&ufsi->meta_lock);
1030                 ufs_data_ptr_clear(uspi, p);
1031                 write_sequnlock(&ufsi->meta_lock);
1032
1033                 if (free_count == 0) {
1034                         frag_to_free = tmp;
1035                         free_count = uspi->s_fpb;
1036                 } else if (free_count > 0 && frag_to_free == tmp - free_count)
1037                         free_count += uspi->s_fpb;
1038                 else {
1039                         ufs_free_blocks (inode, frag_to_free, free_count);
1040                         frag_to_free = tmp;
1041                         free_count = uspi->s_fpb;
1042                 }
1043                 mark_inode_dirty(inode);
1044         }
1045
1046         if (free_count > 0)
1047                 ufs_free_blocks (inode, frag_to_free, free_count);
1048
1049         if (frag3 >= frag4)
1050                 goto next3;
1051
1052         /*
1053          * Free last free fragments
1054          */
1055         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
1056         tmp = ufs_data_ptr_to_cpu(sb, p);
1057         if (!tmp )
1058                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
1059         frag4 = ufs_fragnum (frag4);
1060         write_seqlock(&ufsi->meta_lock);
1061         ufs_data_ptr_clear(uspi, p);
1062         write_sequnlock(&ufsi->meta_lock);
1063
1064         ufs_free_fragments (inode, tmp, frag4);
1065         mark_inode_dirty(inode);
1066  next3:
1067
1068         UFSD("EXIT: ino %lu\n", inode->i_ino);
1069 }
1070
1071 static void ufs_trunc_branch(struct inode *inode, unsigned *offsets, int depth2, int depth, void *p)
1072 {
1073         struct super_block *sb = inode->i_sb;
1074         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1075         struct ufs_inode_info *ufsi = UFS_I(inode);
1076         struct ufs_buffer_head *ubh;
1077         u64 tmp;
1078         bool free_it = !offsets || !depth2;
1079         unsigned from = offsets ? *offsets++ : 0;
1080         unsigned i;
1081
1082         tmp = ufs_data_ptr_to_cpu(sb, p);
1083         if (!tmp)
1084                 return;
1085         ubh = ubh_bread (sb, tmp, uspi->s_bsize);
1086         if (!ubh) {
1087                 write_seqlock(&ufsi->meta_lock);
1088                 ufs_data_ptr_clear(uspi, p);
1089                 write_sequnlock(&ufsi->meta_lock);
1090                 return;
1091         }
1092
1093         if (--depth) {
1094                 for (i = from ; i < uspi->s_apb ; i++, offsets = NULL) {
1095                         void *ind = ubh_get_data_ptr(uspi, ubh, i);
1096                         ufs_trunc_branch(inode, offsets, depth2 - 1, depth, ind);
1097                         ubh_mark_buffer_dirty(ubh);
1098                 }
1099         } else {
1100                 u64 frag_to_free = 0;
1101                 unsigned free_count = 0;
1102
1103                 for (i = from; i < uspi->s_apb; i++) {
1104                         void *ind = ubh_get_data_ptr(uspi, ubh, i);
1105                         tmp = ufs_data_ptr_to_cpu(sb, ind);
1106                         if (!tmp)
1107                                 continue;
1108
1109                         write_seqlock(&UFS_I(inode)->meta_lock);
1110                         ufs_data_ptr_clear(uspi, ind);
1111                         write_sequnlock(&UFS_I(inode)->meta_lock);
1112                         ubh_mark_buffer_dirty(ubh);
1113                         if (free_count == 0) {
1114                                 frag_to_free = tmp;
1115                                 free_count = uspi->s_fpb;
1116                         } else if (free_count > 0 && frag_to_free == tmp - free_count)
1117                                 free_count += uspi->s_fpb;
1118                         else {
1119                                 ufs_free_blocks (inode, frag_to_free, free_count);
1120                                 frag_to_free = tmp;
1121                                 free_count = uspi->s_fpb;
1122                         }
1123
1124                         mark_inode_dirty(inode);
1125                 }
1126
1127                 if (free_count > 0) {
1128                         ufs_free_blocks (inode, frag_to_free, free_count);
1129                 }
1130         }
1131         if (free_it) {
1132                 tmp = ufs_data_ptr_to_cpu(sb, p);
1133                 write_seqlock(&ufsi->meta_lock);
1134                 ufs_data_ptr_clear(uspi, p);
1135                 write_sequnlock(&ufsi->meta_lock);
1136
1137                 ubh_bforget(ubh);
1138                 ufs_free_blocks(inode, tmp, uspi->s_fpb);
1139                 mark_inode_dirty(inode);
1140                 return;
1141         }
1142         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1143                 ubh_sync_block(ubh);
1144         ubh_brelse(ubh);
1145 }
1146
1147 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1148 {
1149         int err = 0;
1150         struct super_block *sb = inode->i_sb;
1151         struct address_space *mapping = inode->i_mapping;
1152         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1153         unsigned i, end;
1154         sector_t lastfrag;
1155         struct page *lastpage;
1156         struct buffer_head *bh;
1157         u64 phys64;
1158
1159         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1160
1161         if (!lastfrag)
1162                 goto out;
1163
1164         lastfrag--;
1165
1166         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1167                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1168        if (IS_ERR(lastpage)) {
1169                err = -EIO;
1170                goto out;
1171        }
1172
1173        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1174        bh = page_buffers(lastpage);
1175        for (i = 0; i < end; ++i)
1176                bh = bh->b_this_page;
1177
1178
1179        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1180
1181        if (unlikely(err))
1182                goto out_unlock;
1183
1184        if (buffer_new(bh)) {
1185                clear_buffer_new(bh);
1186                unmap_underlying_metadata(bh->b_bdev,
1187                                          bh->b_blocknr);
1188                /*
1189                 * we do not zeroize fragment, because of
1190                 * if it maped to hole, it already contains zeroes
1191                 */
1192                set_buffer_uptodate(bh);
1193                mark_buffer_dirty(bh);
1194                set_page_dirty(lastpage);
1195        }
1196
1197        if (lastfrag >= UFS_IND_FRAGMENT) {
1198                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1199                phys64 = bh->b_blocknr + 1;
1200                for (i = 0; i < end; ++i) {
1201                        bh = sb_getblk(sb, i + phys64);
1202                        lock_buffer(bh);
1203                        memset(bh->b_data, 0, sb->s_blocksize);
1204                        set_buffer_uptodate(bh);
1205                        mark_buffer_dirty(bh);
1206                        unlock_buffer(bh);
1207                        sync_dirty_buffer(bh);
1208                        brelse(bh);
1209                }
1210        }
1211 out_unlock:
1212        ufs_put_locked_page(lastpage);
1213 out:
1214        return err;
1215 }
1216
1217 static void __ufs_truncate_blocks(struct inode *inode)
1218 {
1219         struct ufs_inode_info *ufsi = UFS_I(inode);
1220         struct super_block *sb = inode->i_sb;
1221         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1222         unsigned offsets[4];
1223         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1224         int depth2;
1225
1226         if (!depth)
1227                 return;
1228
1229         /* find the last non-zero in offsets[] */
1230         for (depth2 = depth - 1; depth2; depth2--)
1231                 if (offsets[depth2])
1232                         break;
1233
1234         mutex_lock(&ufsi->truncate_mutex);
1235         switch (depth) {
1236         case 1:
1237                 ufs_trunc_direct(inode);
1238                 ufs_trunc_branch(inode, NULL, 0, 1,
1239                            ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK));
1240                 ufs_trunc_branch(inode, NULL, 0, 2,
1241                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
1242                 ufs_trunc_branch(inode, NULL, 0, 3,
1243                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK));
1244                 break;
1245         case 2:
1246                 ufs_trunc_branch(inode, offsets + 1, depth2, 1,
1247                            ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK));
1248                 ufs_trunc_branch(inode, NULL, 0, 2,
1249                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
1250                 ufs_trunc_branch(inode, NULL, 0, 3,
1251                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK));
1252                 break;
1253         case 3:
1254                 ufs_trunc_branch(inode, offsets + 1, depth2, 2,
1255                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
1256                 ufs_trunc_branch(inode, NULL, 0, 3,
1257                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK));
1258                 break;
1259         case 4:
1260                 ufs_trunc_branch(inode, offsets + 1, depth2, 3,
1261                             ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK));
1262         }
1263         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1264         mutex_unlock(&ufsi->truncate_mutex);
1265 }
1266
1267 static int ufs_truncate(struct inode *inode, loff_t size)
1268 {
1269         int err = 0;
1270
1271         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1272              inode->i_ino, (unsigned long long)size,
1273              (unsigned long long)i_size_read(inode));
1274
1275         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1276               S_ISLNK(inode->i_mode)))
1277                 return -EINVAL;
1278         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1279                 return -EPERM;
1280
1281         err = ufs_alloc_lastblock(inode, size);
1282
1283         if (err)
1284                 goto out;
1285
1286         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1287
1288         truncate_setsize(inode, size);
1289
1290         __ufs_truncate_blocks(inode);
1291         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1292         mark_inode_dirty(inode);
1293 out:
1294         UFSD("EXIT: err %d\n", err);
1295         return err;
1296 }
1297
1298 void ufs_truncate_blocks(struct inode *inode)
1299 {
1300         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1301               S_ISLNK(inode->i_mode)))
1302                 return;
1303         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1304                 return;
1305         __ufs_truncate_blocks(inode);
1306 }
1307
1308 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1309 {
1310         struct inode *inode = d_inode(dentry);
1311         unsigned int ia_valid = attr->ia_valid;
1312         int error;
1313
1314         error = inode_change_ok(inode, attr);
1315         if (error)
1316                 return error;
1317
1318         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1319                 error = ufs_truncate(inode, attr->ia_size);
1320                 if (error)
1321                         return error;
1322         }
1323
1324         setattr_copy(inode, attr);
1325         mark_inode_dirty(inode);
1326         return 0;
1327 }
1328
1329 const struct inode_operations ufs_file_inode_operations = {
1330         .setattr = ufs_setattr,
1331 };