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, unsigned offsets[4], int depth)
 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         Indirect chain[4], *q = chain;
 130         unsigned *p;
 131         unsigned flags = UFS_SB(sb)->s_flags;
 132         u64 res = 0;
 133
 134         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 135                 uspi->s_fpbshift, uspi->s_apbmask,
 136                 (unsigned long long)mask);
 137
 138         if (depth == 0)
 139                 goto no_block;
 140
 141 again:
 142         p = offsets;
 143
 144         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 145                 goto ufs2;
 146
 147         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 148                 goto changed;
 149         if (!q->key32)
 150                 goto no_block;
 151         while (--depth) {
 152                 __fs32 *ptr;
 153                 struct buffer_head *bh;
 154                 unsigned n = *p++;
 155
 156                 bh = sb_bread(sb, uspi->s_sbbase +
 157                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 158                 if (!bh)
 159                         goto no_block;
 160                 ptr = (__fs32 *)bh->b_data + (n & mask);
 161                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 162                         goto changed;
 163                 if (!q->key32)
 164                         goto no_block;
 165         }
 166         res = fs32_to_cpu(sb, q->key32);
 167         goto found;
 168
 169 ufs2:
 170         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 171                 goto changed;
 172         if (!q->key64)
 173                 goto no_block;
 174
 175         while (--depth) {
 176                 __fs64 *ptr;
 177                 struct buffer_head *bh;
 178                 unsigned n = *p++;
 179
 180                 bh = sb_bread(sb, uspi->s_sbbase +
 181                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 182                 if (!bh)
 183                         goto no_block;
 184                 ptr = (__fs64 *)bh->b_data + (n & mask);
 185                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 186                         goto changed;
 187                 if (!q->key64)
 188                         goto no_block;
 189         }
 190         res = fs64_to_cpu(sb, q->key64);
 191 found:
 192         res += uspi->s_sbbase;
 193 no_block:
 194         while (q > chain) {
 195                 brelse(q->bh);
 196                 q--;
 197         }
 198         return res;
 199
 200 changed:
 201         while (q > chain) {
 202                 brelse(q->bh);
 203                 q--;
 204         }
 205         goto again;
 206 }
 207
 208 /*
 209  * Unpacking tails: we have a file with partial final block and
 210  * we had been asked to extend it.  If the fragment being written
 211  * is within the same block, we need to extend the tail just to cover
 212  * that fragment.  Otherwise the tail is extended to full block.
 213  *
 214  * Note that we might need to create a _new_ tail, but that will
 215  * be handled elsewhere; this is strictly for resizing old
 216  * ones.
 217  */
 218 static bool
 219 ufs_extend_tail(struct inode *inode, u64 writes_to,
 220                   int *err, struct page *locked_page)
 221 {
 222         struct ufs_inode_info *ufsi = UFS_I(inode);
 223         struct super_block *sb = inode->i_sb;
 224         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 225         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 226         unsigned block = ufs_fragstoblks(lastfrag);
 227         unsigned new_size;
 228         void *p;
 229         u64 tmp;
 230
 231         if (writes_to < (lastfrag | uspi->s_fpbmask))
 232                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 233         else
 234                 new_size = uspi->s_fpb;
 235
 236         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 237         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 238                                 new_size, err, locked_page);
 239         return tmp != 0;
 240 }
 241
 242 /**
 243  * ufs_inode_getfrag() - allocate new fragment(s)
 244  * @inode: pointer to inode
 245  * @index: number of block pointer within the inode's array.
 246  * @new_fragment: number of new allocated fragment(s)
 247  * @err: we set it if something wrong
 248  * @phys: pointer to where we save physical number of new allocated fragments,
 249  *   NULL if we allocate not data(indirect blocks for example).
 250  * @new: we set it if we allocate new block
 251  * @locked_page: for ufs_new_fragments()
 252  */
 253 static u64
 254 ufs_inode_getfrag(struct inode *inode, unsigned index,
 255                   sector_t new_fragment, int *err,
 256                   long *phys, int *new, struct page *locked_page)
 257 {
 258         struct ufs_inode_info *ufsi = UFS_I(inode);
 259         struct super_block *sb = inode->i_sb;
 260         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 261         u64 tmp, goal, lastfrag;
 262         unsigned nfrags = uspi->s_fpb;
 263         void *p;
 264
 265         /* TODO : to be done for write support
 266         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 267              goto ufs2;
 268          */
 269
 270         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 271         tmp = ufs_data_ptr_to_cpu(sb, p);
 272         if (tmp)
 273                 goto out;
 274
 275         lastfrag = ufsi->i_lastfrag;
 276
 277         /* will that be a new tail? */
 278         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 279                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 280
 281         goal = 0;
 282         if (index) {
 283                 goal = ufs_data_ptr_to_cpu(sb,
 284                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 285                 if (goal)
 286                         goal += uspi->s_fpb;
 287         }
 288         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 289                                 goal, uspi->s_fpb, err,
 290                                 phys != NULL ? locked_page : NULL);
 291
 292         if (!tmp) {
 293                 *err = -ENOSPC;
 294                 return 0;
 295         }
 296
 297         if (phys) {
 298                 *err = 0;
 299                 *new = 1;
 300         }
 301         inode->i_ctime = CURRENT_TIME_SEC;
 302         if (IS_SYNC(inode))
 303                 ufs_sync_inode (inode);
 304         mark_inode_dirty(inode);
 305 out:
 306         return tmp + uspi->s_sbbase;
 307
 308      /* This part : To be implemented ....
 309         Required only for writing, not required for READ-ONLY.
 310 ufs2:
 311
 312         u2_block = ufs_fragstoblks(fragment);
 313         u2_blockoff = ufs_fragnum(fragment);
 314         p = ufsi->i_u1.u2_i_data + block;
 315         goal = 0;
 316
 317 repeat2:
 318         tmp = fs32_to_cpu(sb, *p);
 319         lastfrag = ufsi->i_lastfrag;
 320
 321      */
 322 }
 323
 324 /**
 325  * ufs_inode_getblock() - allocate new block
 326  * @inode: pointer to inode
 327  * @ind_block: block number of the indirect block
 328  * @index: number of pointer within the indirect block
 329  * @new_fragment: number of new allocated fragment
 330  *  (block will hold this fragment and also uspi->s_fpb-1)
 331  * @err: see ufs_inode_getfrag()
 332  * @phys: see ufs_inode_getfrag()
 333  * @new: see ufs_inode_getfrag()
 334  * @locked_page: see ufs_inode_getfrag()
 335  */
 336 static u64
 337 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 338                   unsigned index, sector_t new_fragment, int *err,
 339                   long *phys, int *new, struct page *locked_page)
 340 {
 341         struct super_block *sb = inode->i_sb;
 342         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 343         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 344         u64 tmp = 0, goal;
 345         struct buffer_head *bh;
 346         void *p;
 347
 348         if (!ind_block)
 349                 return 0;
 350
 351         bh = sb_bread(sb, ind_block + (index >> shift));
 352         if (unlikely(!bh)) {
 353                 *err = -EIO;
 354                 return 0;
 355         }
 356
 357         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 358         if (uspi->fs_magic == UFS2_MAGIC)
 359                 p = (__fs64 *)bh->b_data + index;
 360         else
 361                 p = (__fs32 *)bh->b_data + index;
 362
 363         tmp = ufs_data_ptr_to_cpu(sb, p);
 364         if (tmp)
 365                 goto out;
 366
 367         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 368                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 369                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 370                 goal = tmp + uspi->s_fpb;
 371         else
 372                 goal = bh->b_blocknr + uspi->s_fpb;
 373         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 374                                 uspi->s_fpb, err, locked_page);
 375         if (!tmp)
 376                 goto out;
 377
 378         if (new)
 379                 *new = 1;
 380
 381         mark_buffer_dirty(bh);
 382         if (IS_SYNC(inode))
 383                 sync_dirty_buffer(bh);
 384         inode->i_ctime = CURRENT_TIME_SEC;
 385         mark_inode_dirty(inode);
 386 out:
 387         brelse (bh);
 388         UFSD("EXIT\n");
 389         if (tmp)
 390                 tmp += uspi->s_sbbase;
 391         return tmp;
 392 }
 393
 394 /**
 395  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 396  * readpage, writepage and so on
 397  */
 398
 399 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 400 {
 401         struct super_block * sb = inode->i_sb;
 402         struct ufs_sb_info * sbi = UFS_SB(sb);
 403         struct ufs_sb_private_info * uspi = sbi->s_uspi;
 404         struct buffer_head * bh;
 405         int ret, err, new;
 406         unsigned offsets[4];
 407         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 408         unsigned long phys;
 409         u64 phys64 = 0;
 410         unsigned frag = fragment & uspi->s_fpbmask;
 411
 412         if (!create) {
 413                 phys64 = ufs_frag_map(inode, offsets, depth);
 414                 if (phys64) {
 415                         phys64 += frag;
 416                         map_bh(bh_result, sb, phys64);
 417                 }
 418                 return 0;
 419         }
 420
 421         /* This code entered only while writing ....? */
 422
 423         err = -EIO;
 424         new = 0;
 425         ret = 0;
 426         bh = NULL;
 427
 428         mutex_lock(&UFS_I(inode)->truncate_mutex);
 429
 430         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 431         if (!depth)
 432                 goto abort_too_big;
 433
 434         err = 0;
 435
 436         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 437                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 438                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 439                 if (tailfrags && fragment >= lastfrag) {
 440                         if (!ufs_extend_tail(inode, fragment,
 441                                              &err, bh_result->b_page))
 442                                 goto abort;
 443                 }
 444         }
 445
 446         if (depth == 1) {
 447                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 448                                            &err, &phys, &new, bh_result->b_page);
 449         } else {
 450                 int i;
 451                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 452                                            &err, NULL, NULL, bh_result->b_page);
 453                 for (i = 1; i < depth - 1; i++)
 454                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 455                                                 fragment, &err, NULL, NULL, NULL);
 456                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 457                                         fragment, &err, &phys, &new, bh_result->b_page);
 458         }
 459         if (phys64) {
 460                 phys64 += frag;
 461                 phys = phys64;
 462         }
 463         if (err)
 464                 goto abort;
 465         if (new)
 466                 set_buffer_new(bh_result);
 467         map_bh(bh_result, sb, phys);
 468 abort:
 469         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 470
 471         return err;
 472
 473 abort_too_big:
 474         ufs_warning(sb, "ufs_get_block", "block > big");
 475         goto abort;
 476 }
 477
 478 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 479 {
 480         return block_write_full_page(page,ufs_getfrag_block,wbc);
 481 }
 482
 483 static int ufs_readpage(struct file *file, struct page *page)
 484 {
 485         return block_read_full_page(page,ufs_getfrag_block);
 486 }
 487
 488 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 489 {
 490         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 491 }
 492
 493 static void ufs_truncate_blocks(struct inode *);
 494
 495 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 496 {
 497         struct inode *inode = mapping->host;
 498
 499         if (to > inode->i_size) {
 500                 truncate_pagecache(inode, inode->i_size);
 501                 ufs_truncate_blocks(inode);
 502         }
 503 }
 504
 505 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 506                         loff_t pos, unsigned len, unsigned flags,
 507                         struct page **pagep, void **fsdata)
 508 {
 509         int ret;
 510
 511         ret = block_write_begin(mapping, pos, len, flags, pagep,
 512                                 ufs_getfrag_block);
 513         if (unlikely(ret))
 514                 ufs_write_failed(mapping, pos + len);
 515
 516         return ret;
 517 }
 518
 519 static int ufs_write_end(struct file *file, struct address_space *mapping,
 520                         loff_t pos, unsigned len, unsigned copied,
 521                         struct page *page, void *fsdata)
 522 {
 523         int ret;
 524
 525         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 526         if (ret < len)
 527                 ufs_write_failed(mapping, pos + len);
 528         return ret;
 529 }
 530
 531 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 532 {
 533         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 534 }
 535
 536 const struct address_space_operations ufs_aops = {
 537         .readpage = ufs_readpage,
 538         .writepage = ufs_writepage,
 539         .write_begin = ufs_write_begin,
 540         .write_end = ufs_write_end,
 541         .bmap = ufs_bmap
 542 };
 543
 544 static void ufs_set_inode_ops(struct inode *inode)
 545 {
 546         if (S_ISREG(inode->i_mode)) {
 547                 inode->i_op = &ufs_file_inode_operations;
 548                 inode->i_fop = &ufs_file_operations;
 549                 inode->i_mapping->a_ops = &ufs_aops;
 550         } else if (S_ISDIR(inode->i_mode)) {
 551                 inode->i_op = &ufs_dir_inode_operations;
 552                 inode->i_fop = &ufs_dir_operations;
 553                 inode->i_mapping->a_ops = &ufs_aops;
 554         } else if (S_ISLNK(inode->i_mode)) {
 555                 if (!inode->i_blocks) {
 556                         inode->i_op = &ufs_fast_symlink_inode_operations;
 557                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 558                 } else {
 559                         inode->i_op = &ufs_symlink_inode_operations;
 560                         inode->i_mapping->a_ops = &ufs_aops;
 561                 }
 562         } else
 563                 init_special_inode(inode, inode->i_mode,
 564                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 565 }
 566
 567 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 568 {
 569         struct ufs_inode_info *ufsi = UFS_I(inode);
 570         struct super_block *sb = inode->i_sb;
 571         umode_t mode;
 572
 573         /*
 574          * Copy data to the in-core inode.
 575          */
 576         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 577         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 578         if (inode->i_nlink == 0) {
 579                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 580                 return -1;
 581         }
 582
 583         /*
 584          * Linux now has 32-bit uid and gid, so we can support EFT.
 585          */
 586         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 587         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 588
 589         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 590         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 591         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 592         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 593         inode->i_mtime.tv_nsec = 0;
 594         inode->i_atime.tv_nsec = 0;
 595         inode->i_ctime.tv_nsec = 0;
 596         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 597         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 598         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 599         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 600         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 601
 602
 603         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 604                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 605                        sizeof(ufs_inode->ui_u2.ui_addr));
 606         } else {
 607                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 608                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 609                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 610         }
 611         return 0;
 612 }
 613
 614 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 615 {
 616         struct ufs_inode_info *ufsi = UFS_I(inode);
 617         struct super_block *sb = inode->i_sb;
 618         umode_t mode;
 619
 620         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 621         /*
 622          * Copy data to the in-core inode.
 623          */
 624         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 625         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 626         if (inode->i_nlink == 0) {
 627                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 628                 return -1;
 629         }
 630
 631         /*
 632          * Linux now has 32-bit uid and gid, so we can support EFT.
 633          */
 634         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 635         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 636
 637         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 638         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 639         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 640         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 641         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 642         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 643         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 644         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 645         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 646         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 647         /*
 648         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 649         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 650         */
 651
 652         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 653                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 654                        sizeof(ufs2_inode->ui_u2.ui_addr));
 655         } else {
 656                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 657                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 658                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 659         }
 660         return 0;
 661 }
 662
 663 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 664 {
 665         struct ufs_inode_info *ufsi;
 666         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 667         struct buffer_head * bh;
 668         struct inode *inode;
 669         int err;
 670
 671         UFSD("ENTER, ino %lu\n", ino);
 672
 673         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 674                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 675                             ino);
 676                 return ERR_PTR(-EIO);
 677         }
 678
 679         inode = iget_locked(sb, ino);
 680         if (!inode)
 681                 return ERR_PTR(-ENOMEM);
 682         if (!(inode->i_state & I_NEW))
 683                 return inode;
 684
 685         ufsi = UFS_I(inode);
 686
 687         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 688         if (!bh) {
 689                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 690                             inode->i_ino);
 691                 goto bad_inode;
 692         }
 693         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 694                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 695
 696                 err = ufs2_read_inode(inode,
 697                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 698         } else {
 699                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 700
 701                 err = ufs1_read_inode(inode,
 702                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 703         }
 704
 705         if (err)
 706                 goto bad_inode;
 707         inode->i_version++;
 708         ufsi->i_lastfrag =
 709                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 710         ufsi->i_dir_start_lookup = 0;
 711         ufsi->i_osync = 0;
 712
 713         ufs_set_inode_ops(inode);
 714
 715         brelse(bh);
 716
 717         UFSD("EXIT\n");
 718         unlock_new_inode(inode);
 719         return inode;
 720
 721 bad_inode:
 722         iget_failed(inode);
 723         return ERR_PTR(-EIO);
 724 }
 725
 726 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 727 {
 728         struct super_block *sb = inode->i_sb;
 729         struct ufs_inode_info *ufsi = UFS_I(inode);
 730
 731         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 732         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 733
 734         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 735         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 736
 737         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 738         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 739         ufs_inode->ui_atime.tv_usec = 0;
 740         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 741         ufs_inode->ui_ctime.tv_usec = 0;
 742         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 743         ufs_inode->ui_mtime.tv_usec = 0;
 744         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 745         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 746         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 747
 748         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 749                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 750                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 751         }
 752
 753         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 754                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 755                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 756         } else if (inode->i_blocks) {
 757                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 758                        sizeof(ufs_inode->ui_u2.ui_addr));
 759         }
 760         else {
 761                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 762                        sizeof(ufs_inode->ui_u2.ui_symlink));
 763         }
 764
 765         if (!inode->i_nlink)
 766                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 767 }
 768
 769 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 770 {
 771         struct super_block *sb = inode->i_sb;
 772         struct ufs_inode_info *ufsi = UFS_I(inode);
 773
 774         UFSD("ENTER\n");
 775         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 776         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 777
 778         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 779         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 780
 781         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 782         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 783         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 784         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 785         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 786         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 787         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 788
 789         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 790         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 791         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 792
 793         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 794                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 795                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 796         } else if (inode->i_blocks) {
 797                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 798                        sizeof(ufs_inode->ui_u2.ui_addr));
 799         } else {
 800                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 801                        sizeof(ufs_inode->ui_u2.ui_symlink));
 802         }
 803
 804         if (!inode->i_nlink)
 805                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 806         UFSD("EXIT\n");
 807 }
 808
 809 static int ufs_update_inode(struct inode * inode, int do_sync)
 810 {
 811         struct super_block *sb = inode->i_sb;
 812         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 813         struct buffer_head * bh;
 814
 815         UFSD("ENTER, ino %lu\n", inode->i_ino);
 816
 817         if (inode->i_ino < UFS_ROOTINO ||
 818             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 819                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 820                 return -1;
 821         }
 822
 823         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 824         if (!bh) {
 825                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 826                 return -1;
 827         }
 828         if (uspi->fs_magic == UFS2_MAGIC) {
 829                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 830
 831                 ufs2_update_inode(inode,
 832                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 833         } else {
 834                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 835
 836                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 837         }
 838
 839         mark_buffer_dirty(bh);
 840         if (do_sync)
 841                 sync_dirty_buffer(bh);
 842         brelse (bh);
 843
 844         UFSD("EXIT\n");
 845         return 0;
 846 }
 847
 848 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 849 {
 850         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 851 }
 852
 853 int ufs_sync_inode (struct inode *inode)
 854 {
 855         return ufs_update_inode (inode, 1);
 856 }
 857
 858 void ufs_evict_inode(struct inode * inode)
 859 {
 860         int want_delete = 0;
 861
 862         if (!inode->i_nlink && !is_bad_inode(inode))
 863                 want_delete = 1;
 864
 865         truncate_inode_pages_final(&inode->i_data);
 866         if (want_delete) {
 867                 inode->i_size = 0;
 868                 if (inode->i_blocks)
 869                         ufs_truncate_blocks(inode);
 870         }
 871
 872         invalidate_inode_buffers(inode);
 873         clear_inode(inode);
 874
 875         if (want_delete)
 876                 ufs_free_inode(inode);
 877 }
 878
 879 struct to_free {
 880         struct inode *inode;
 881         u64 to;
 882         unsigned count;
 883 };
 884
 885 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 886 {
 887         if (ctx->count && ctx->to != from) {
 888                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 889                 ctx->count = 0;
 890         }
 891         ctx->count += count;
 892         ctx->to = from + count;
 893 }
 894
 895 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 896 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 897
 898 static void ufs_trunc_direct(struct inode *inode)
 899 {
 900         struct ufs_inode_info *ufsi = UFS_I(inode);
 901         struct super_block * sb;
 902         struct ufs_sb_private_info * uspi;
 903         void *p;
 904         u64 frag1, frag2, frag3, frag4, block1, block2;
 905         struct to_free ctx = {.inode = inode};
 906         unsigned i, tmp;
 907
 908         UFSD("ENTER: ino %lu\n", inode->i_ino);
 909
 910         sb = inode->i_sb;
 911         uspi = UFS_SB(sb)->s_uspi;
 912
 913         frag1 = DIRECT_FRAGMENT;
 914         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 915         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 916         frag3 = frag4 & ~uspi->s_fpbmask;
 917         block1 = block2 = 0;
 918         if (frag2 > frag3) {
 919                 frag2 = frag4;
 920                 frag3 = frag4 = 0;
 921         } else if (frag2 < frag3) {
 922                 block1 = ufs_fragstoblks (frag2);
 923                 block2 = ufs_fragstoblks (frag3);
 924         }
 925
 926         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 927              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 928              (unsigned long long)frag1, (unsigned long long)frag2,
 929              (unsigned long long)block1, (unsigned long long)block2,
 930              (unsigned long long)frag3, (unsigned long long)frag4);
 931
 932         if (frag1 >= frag2)
 933                 goto next1;
 934
 935         /*
 936          * Free first free fragments
 937          */
 938         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 939         tmp = ufs_data_ptr_to_cpu(sb, p);
 940         if (!tmp )
 941                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 942         frag2 -= frag1;
 943         frag1 = ufs_fragnum (frag1);
 944
 945         ufs_free_fragments(inode, tmp + frag1, frag2);
 946
 947 next1:
 948         /*
 949          * Free whole blocks
 950          */
 951         for (i = block1 ; i < block2; i++) {
 952                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 953                 tmp = ufs_data_ptr_to_cpu(sb, p);
 954                 if (!tmp)
 955                         continue;
 956                 write_seqlock(&ufsi->meta_lock);
 957                 ufs_data_ptr_clear(uspi, p);
 958                 write_sequnlock(&ufsi->meta_lock);
 959
 960                 free_data(&ctx, tmp, uspi->s_fpb);
 961         }
 962
 963         free_data(&ctx, 0, 0);
 964
 965         if (frag3 >= frag4)
 966                 goto next3;
 967
 968         /*
 969          * Free last free fragments
 970          */
 971         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 972         tmp = ufs_data_ptr_to_cpu(sb, p);
 973         if (!tmp )
 974                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 975         frag4 = ufs_fragnum (frag4);
 976         write_seqlock(&ufsi->meta_lock);
 977         ufs_data_ptr_clear(uspi, p);
 978         write_sequnlock(&ufsi->meta_lock);
 979
 980         ufs_free_fragments (inode, tmp, frag4);
 981  next3:
 982
 983         UFSD("EXIT: ino %lu\n", inode->i_ino);
 984 }
 985
 986 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 987 {
 988         struct super_block *sb = inode->i_sb;
 989         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 990         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 991         unsigned i;
 992
 993         if (!ubh)
 994                 return;
 995
 996         if (--depth) {
 997                 for (i = 0; i < uspi->s_apb; i++) {
 998                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 999                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1000                         if (block)
1001                                 free_full_branch(inode, block, depth);
1002                 }
1003         } else {
1004                 struct to_free ctx = {.inode = inode};
1005
1006                 for (i = 0; i < uspi->s_apb; i++) {
1007                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1008                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1009                         if (block)
1010                                 free_data(&ctx, block, uspi->s_fpb);
1011                 }
1012                 free_data(&ctx, 0, 0);
1013         }
1014
1015         ubh_bforget(ubh);
1016         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1017 }
1018
1019 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1020 {
1021         struct super_block *sb = inode->i_sb;
1022         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1023         unsigned i;
1024
1025         if (--depth) {
1026                 for (i = from; i < uspi->s_apb ; i++) {
1027                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1028                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1029                         if (block) {
1030                                 write_seqlock(&UFS_I(inode)->meta_lock);
1031                                 ufs_data_ptr_clear(uspi, p);
1032                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1033                                 ubh_mark_buffer_dirty(ubh);
1034                                 free_full_branch(inode, block, depth);
1035                         }
1036                 }
1037         } else {
1038                 struct to_free ctx = {.inode = inode};
1039
1040                 for (i = from; i < uspi->s_apb; i++) {
1041                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1042                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1043                         if (block) {
1044                                 write_seqlock(&UFS_I(inode)->meta_lock);
1045                                 ufs_data_ptr_clear(uspi, p);
1046                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1047                                 ubh_mark_buffer_dirty(ubh);
1048                                 free_data(&ctx, block, uspi->s_fpb);
1049                         }
1050                 }
1051                 free_data(&ctx, 0, 0);
1052         }
1053         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1054                 ubh_sync_block(ubh);
1055         ubh_brelse(ubh);
1056 }
1057
1058 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1059 {
1060         int err = 0;
1061         struct super_block *sb = inode->i_sb;
1062         struct address_space *mapping = inode->i_mapping;
1063         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1064         unsigned i, end;
1065         sector_t lastfrag;
1066         struct page *lastpage;
1067         struct buffer_head *bh;
1068         u64 phys64;
1069
1070         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1071
1072         if (!lastfrag)
1073                 goto out;
1074
1075         lastfrag--;
1076
1077         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1078                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1079        if (IS_ERR(lastpage)) {
1080                err = -EIO;
1081                goto out;
1082        }
1083
1084        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1085        bh = page_buffers(lastpage);
1086        for (i = 0; i < end; ++i)
1087                bh = bh->b_this_page;
1088
1089
1090        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1091
1092        if (unlikely(err))
1093                goto out_unlock;
1094
1095        if (buffer_new(bh)) {
1096                clear_buffer_new(bh);
1097                unmap_underlying_metadata(bh->b_bdev,
1098                                          bh->b_blocknr);
1099                /*
1100                 * we do not zeroize fragment, because of
1101                 * if it maped to hole, it already contains zeroes
1102                 */
1103                set_buffer_uptodate(bh);
1104                mark_buffer_dirty(bh);
1105                set_page_dirty(lastpage);
1106        }
1107
1108        if (lastfrag >= UFS_IND_FRAGMENT) {
1109                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1110                phys64 = bh->b_blocknr + 1;
1111                for (i = 0; i < end; ++i) {
1112                        bh = sb_getblk(sb, i + phys64);
1113                        lock_buffer(bh);
1114                        memset(bh->b_data, 0, sb->s_blocksize);
1115                        set_buffer_uptodate(bh);
1116                        mark_buffer_dirty(bh);
1117                        unlock_buffer(bh);
1118                        sync_dirty_buffer(bh);
1119                        brelse(bh);
1120                }
1121        }
1122 out_unlock:
1123        ufs_put_locked_page(lastpage);
1124 out:
1125        return err;
1126 }
1127
1128 static void __ufs_truncate_blocks(struct inode *inode)
1129 {
1130         struct ufs_inode_info *ufsi = UFS_I(inode);
1131         struct super_block *sb = inode->i_sb;
1132         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1133         unsigned offsets[4];
1134         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1135         int depth2;
1136         unsigned i;
1137         struct ufs_buffer_head *ubh[3];
1138         void *p;
1139         u64 block;
1140
1141         if (!depth)
1142                 return;
1143
1144         /* find the last non-zero in offsets[] */
1145         for (depth2 = depth - 1; depth2; depth2--)
1146                 if (offsets[depth2])
1147                         break;
1148
1149         mutex_lock(&ufsi->truncate_mutex);
1150         if (depth == 1) {
1151                 ufs_trunc_direct(inode);
1152                 offsets[0] = UFS_IND_BLOCK;
1153         } else {
1154                 /* get the blocks that should be partially emptied */
1155                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1156                 for (i = 0; i < depth2; i++) {
1157                         offsets[i]++;   /* next branch is fully freed */
1158                         block = ufs_data_ptr_to_cpu(sb, p);
1159                         if (!block)
1160                                 break;
1161                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1162                         if (!ubh[i]) {
1163                                 write_seqlock(&ufsi->meta_lock);
1164                                 ufs_data_ptr_clear(uspi, p);
1165                                 write_sequnlock(&ufsi->meta_lock);
1166                                 break;
1167                         }
1168                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1169                 }
1170                 while (i--)
1171                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1172         }
1173         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1174                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1175                 block = ufs_data_ptr_to_cpu(sb, p);
1176                 if (block) {
1177                         write_seqlock(&ufsi->meta_lock);
1178                         ufs_data_ptr_clear(uspi, p);
1179                         write_sequnlock(&ufsi->meta_lock);
1180                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1181                 }
1182         }
1183         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1184         mark_inode_dirty(inode);
1185         mutex_unlock(&ufsi->truncate_mutex);
1186 }
1187
1188 static int ufs_truncate(struct inode *inode, loff_t size)
1189 {
1190         int err = 0;
1191
1192         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1193              inode->i_ino, (unsigned long long)size,
1194              (unsigned long long)i_size_read(inode));
1195
1196         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1197               S_ISLNK(inode->i_mode)))
1198                 return -EINVAL;
1199         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1200                 return -EPERM;
1201
1202         err = ufs_alloc_lastblock(inode, size);
1203
1204         if (err)
1205                 goto out;
1206
1207         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1208
1209         truncate_setsize(inode, size);
1210
1211         __ufs_truncate_blocks(inode);
1212         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1213         mark_inode_dirty(inode);
1214 out:
1215         UFSD("EXIT: err %d\n", err);
1216         return err;
1217 }
1218
1219 void ufs_truncate_blocks(struct inode *inode)
1220 {
1221         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1222               S_ISLNK(inode->i_mode)))
1223                 return;
1224         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1225                 return;
1226         __ufs_truncate_blocks(inode);
1227 }
1228
1229 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1230 {
1231         struct inode *inode = d_inode(dentry);
1232         unsigned int ia_valid = attr->ia_valid;
1233         int error;
1234
1235         error = inode_change_ok(inode, attr);
1236         if (error)
1237                 return error;
1238
1239         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1240                 error = ufs_truncate(inode, attr->ia_size);
1241                 if (error)
1242                         return error;
1243         }
1244
1245         setattr_copy(inode, attr);
1246         mark_inode_dirty(inode);
1247         return 0;
1248 }
1249
1250 const struct inode_operations ufs_file_inode_operations = {
1251         .setattr = ufs_setattr,
1252 };