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  * ufs_inode_getfrag() - allocate new fragment(s)
 210  * @inode: pointer to inode
 211  * @fragment: number of `fragment' which hold pointer
 212  *   to new allocated fragment(s)
 213  * @new_fragment: number of new allocated fragment(s)
 214  * @required: how many fragment(s) we require
 215  * @err: we set it if something wrong
 216  * @phys: pointer to where we save physical number of new allocated fragments,
 217  *   NULL if we allocate not data(indirect blocks for example).
 218  * @new: we set it if we allocate new block
 219  * @locked_page: for ufs_new_fragments()
 220  */
 221 static u64
 222 ufs_inode_getfrag(struct inode *inode, u64 fragment,
 223                   sector_t new_fragment, unsigned int required, int *err,
 224                   long *phys, int *new, struct page *locked_page)
 225 {
 226         struct ufs_inode_info *ufsi = UFS_I(inode);
 227         struct super_block *sb = inode->i_sb;
 228         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 229         unsigned blockoff, lastblockoff;
 230         u64 tmp, goal, lastfrag, block, lastblock;
 231         void *p, *p2;
 232
 233         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
 234              "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
 235              (unsigned long long)new_fragment, required, !phys);
 236
 237         /* TODO : to be done for write support
 238         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 239              goto ufs2;
 240          */
 241
 242         block = ufs_fragstoblks (fragment);
 243         blockoff = ufs_fragnum (fragment);
 244         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 245
 246         goal = 0;
 247
 248         tmp = ufs_data_ptr_to_cpu(sb, p);
 249
 250         lastfrag = ufsi->i_lastfrag;
 251         if (tmp && fragment < lastfrag)
 252                 goto out;
 253
 254         lastblock = ufs_fragstoblks (lastfrag);
 255         lastblockoff = ufs_fragnum (lastfrag);
 256         /*
 257          * We will extend file into new block beyond last allocated block
 258          */
 259         if (lastblock < block) {
 260                 /*
 261                  * We must reallocate last allocated block
 262                  */
 263                 if (lastblockoff) {
 264                         p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
 265                         tmp = ufs_new_fragments(inode, p2, lastfrag,
 266                                                 ufs_data_ptr_to_cpu(sb, p2),
 267                                                 uspi->s_fpb - lastblockoff,
 268                                                 err, locked_page);
 269                         if (!tmp)
 270                                 return 0;
 271                         lastfrag = ufsi->i_lastfrag;
 272                 }
 273                 tmp = ufs_data_ptr_to_cpu(sb,
 274                                          ufs_get_direct_data_ptr(uspi, ufsi,
 275                                                                  lastblock));
 276                 if (tmp)
 277                         goal = tmp + uspi->s_fpb;
 278                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 279                                          goal, required + blockoff,
 280                                          err,
 281                                          phys != NULL ? locked_page : NULL);
 282         } else if (lastblock == block) {
 283         /*
 284          * We will extend last allocated block
 285          */
 286                 tmp = ufs_new_fragments(inode, p, fragment -
 287                                         (blockoff - lastblockoff),
 288                                         ufs_data_ptr_to_cpu(sb, p),
 289                                         required +  (blockoff - lastblockoff),
 290                                         err, phys != NULL ? locked_page : NULL);
 291         } else /* (lastblock > block) */ {
 292         /*
 293          * We will allocate new block before last allocated block
 294          */
 295                 if (block) {
 296                         tmp = ufs_data_ptr_to_cpu(sb,
 297                                                  ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
 298                         if (tmp)
 299                                 goal = tmp + uspi->s_fpb;
 300                 }
 301                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 302                                         goal, uspi->s_fpb, err,
 303                                         phys != NULL ? locked_page : NULL);
 304         }
 305         if (!tmp) {
 306                 *err = -ENOSPC;
 307                 return 0;
 308         }
 309
 310         if (phys) {
 311                 *err = 0;
 312                 *new = 1;
 313         }
 314         inode->i_ctime = CURRENT_TIME_SEC;
 315         if (IS_SYNC(inode))
 316                 ufs_sync_inode (inode);
 317         mark_inode_dirty(inode);
 318 out:
 319         return tmp + uspi->s_sbbase;
 320
 321      /* This part : To be implemented ....
 322         Required only for writing, not required for READ-ONLY.
 323 ufs2:
 324
 325         u2_block = ufs_fragstoblks(fragment);
 326         u2_blockoff = ufs_fragnum(fragment);
 327         p = ufsi->i_u1.u2_i_data + block;
 328         goal = 0;
 329
 330 repeat2:
 331         tmp = fs32_to_cpu(sb, *p);
 332         lastfrag = ufsi->i_lastfrag;
 333
 334      */
 335 }
 336
 337 /**
 338  * ufs_inode_getblock() - allocate new block
 339  * @inode: pointer to inode
 340  * @bh: pointer to block which hold "pointer" to new allocated block
 341  * @index: number of pointer in the indirect block
 342  * @new_fragment: number of new allocated fragment
 343  *  (block will hold this fragment and also uspi->s_fpb-1)
 344  * @err: see ufs_inode_getfrag()
 345  * @phys: see ufs_inode_getfrag()
 346  * @new: see ufs_inode_getfrag()
 347  * @locked_page: see ufs_inode_getfrag()
 348  */
 349 static u64
 350 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 351                   unsigned index, sector_t new_fragment, int *err,
 352                   long *phys, int *new, struct page *locked_page)
 353 {
 354         struct super_block *sb = inode->i_sb;
 355         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 356         u64 tmp = 0, goal;
 357         void *p;
 358
 359         if (!bh)
 360                 goto out;
 361         if (!buffer_uptodate(bh)) {
 362                 ll_rw_block (READ, 1, &bh);
 363                 wait_on_buffer (bh);
 364                 if (!buffer_uptodate(bh))
 365                         goto out;
 366         }
 367         if (uspi->fs_magic == UFS2_MAGIC)
 368                 p = (__fs64 *)bh->b_data + index;
 369         else
 370                 p = (__fs32 *)bh->b_data + index;
 371
 372         tmp = ufs_data_ptr_to_cpu(sb, p);
 373         if (tmp)
 374                 goto out;
 375
 376         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 377                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 378                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 379                 goal = tmp + uspi->s_fpb;
 380         else
 381                 goal = bh->b_blocknr + uspi->s_fpb;
 382         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 383                                 uspi->s_fpb, err, locked_page);
 384         if (!tmp)
 385                 goto out;
 386
 387         if (new)
 388                 *new = 1;
 389
 390         mark_buffer_dirty(bh);
 391         if (IS_SYNC(inode))
 392                 sync_dirty_buffer(bh);
 393         inode->i_ctime = CURRENT_TIME_SEC;
 394         mark_inode_dirty(inode);
 395 out:
 396         brelse (bh);
 397         UFSD("EXIT\n");
 398         if (tmp)
 399                 tmp += uspi->s_sbbase;
 400         return tmp;
 401 }
 402
 403 /**
 404  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 405  * readpage, writepage and so on
 406  */
 407
 408 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 409 {
 410         struct super_block * sb = inode->i_sb;
 411         struct ufs_sb_info * sbi = UFS_SB(sb);
 412         struct ufs_sb_private_info * uspi = sbi->s_uspi;
 413         struct buffer_head * bh;
 414         int ret, err, new;
 415         unsigned offsets[4];
 416         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 417         unsigned long ptr,phys;
 418         u64 phys64 = 0;
 419         unsigned frag = fragment & uspi->s_fpbmask;
 420         unsigned mask = uspi->s_apbmask >> uspi->s_fpbshift;
 421
 422         if (!create) {
 423                 phys64 = ufs_frag_map(inode, offsets, depth);
 424                 if (phys64) {
 425                         phys64 += frag;
 426                         map_bh(bh_result, sb, phys64);
 427                 }
 428                 return 0;
 429         }
 430
 431         /* This code entered only while writing ....? */
 432
 433         err = -EIO;
 434         new = 0;
 435         ret = 0;
 436         bh = NULL;
 437
 438         mutex_lock(&UFS_I(inode)->truncate_mutex);
 439
 440         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 441         if (!depth)
 442                 goto abort_too_big;
 443
 444         err = 0;
 445         ptr = fragment;
 446
 447         if (depth == 1) {
 448                 phys64 = ufs_inode_getfrag(inode, ptr, fragment, 1, &err, &phys,
 449                                         &new, bh_result->b_page);
 450                 if (phys64) {
 451                         phys64 += frag;
 452                         phys = phys64;
 453                 }
 454                 goto out;
 455         }
 456         ptr -= UFS_NDIR_FRAGMENT;
 457         if (depth == 2) {
 458                 phys64 = ufs_inode_getfrag(inode,
 459                                         UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift),
 460                                         fragment, uspi->s_fpb, &err, NULL, NULL,
 461                                         bh_result->b_page);
 462                 if (phys64) {
 463                         phys64 += (ptr >> uspi->s_apbshift) & uspi->s_fpbmask;
 464                         bh = sb_getblk(sb, phys64);
 465                 } else {
 466                         bh = NULL;
 467                 }
 468                 goto get_indirect;
 469         }
 470         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 471         if (depth == 3) {
 472                 phys64 = ufs_inode_getfrag(inode,
 473                                         UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift),
 474                                         fragment, uspi->s_fpb, &err, NULL, NULL,
 475                                         bh_result->b_page);
 476                 if (phys64) {
 477                         phys64 += (ptr >> uspi->s_2apbshift) & uspi->s_fpbmask;
 478                         bh = sb_getblk(sb, phys64);
 479                 } else {
 480                         bh = NULL;
 481                 }
 482                 goto get_double;
 483         }
 484         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 485         phys64 = ufs_inode_getfrag(inode,
 486                                 UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift),
 487                                 fragment, uspi->s_fpb, &err, NULL, NULL,
 488                                 bh_result->b_page);
 489         if (phys64) {
 490                 phys64 += (ptr >> uspi->s_3apbshift) & uspi->s_fpbmask;
 491                 bh = sb_getblk(sb, phys64);
 492         } else {
 493                 bh = NULL;
 494         }
 495         phys64 = ufs_inode_getblock(inode, bh,
 496                                 offsets[1] & mask,
 497                                 fragment, &err, NULL, NULL, NULL);
 498         if (phys64) {
 499                 phys64 += (ptr >> uspi->s_2apbshift) & uspi->s_fpbmask,
 500                 bh = sb_getblk(sb, phys64);
 501         } else {
 502                 bh = NULL;
 503         }
 504 get_double:
 505         phys64 = ufs_inode_getblock(inode, bh,
 506                                 offsets[depth - 2] & mask,
 507                                 fragment, &err, NULL, NULL, NULL);
 508         if (phys64) {
 509                 phys64 += (ptr >> uspi->s_apbshift) & uspi->s_fpbmask,
 510                 bh = sb_getblk(sb, phys64);
 511         } else {
 512                 bh = NULL;
 513         }
 514 get_indirect:
 515         phys64 = ufs_inode_getblock(inode, bh, offsets[depth - 1] & mask,
 516                                 fragment, &err, &phys, &new, bh_result->b_page);
 517         if (phys64) {
 518                 phys64 += frag;
 519                 phys = phys64;
 520         }
 521 out:
 522         if (err)
 523                 goto abort;
 524         if (new)
 525                 set_buffer_new(bh_result);
 526         map_bh(bh_result, sb, phys);
 527 abort:
 528         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 529
 530         return err;
 531
 532 abort_too_big:
 533         ufs_warning(sb, "ufs_get_block", "block > big");
 534         goto abort;
 535 }
 536
 537 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 538 {
 539         return block_write_full_page(page,ufs_getfrag_block,wbc);
 540 }
 541
 542 static int ufs_readpage(struct file *file, struct page *page)
 543 {
 544         return block_read_full_page(page,ufs_getfrag_block);
 545 }
 546
 547 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 548 {
 549         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 550 }
 551
 552 static void ufs_truncate_blocks(struct inode *);
 553
 554 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 555 {
 556         struct inode *inode = mapping->host;
 557
 558         if (to > inode->i_size) {
 559                 truncate_pagecache(inode, inode->i_size);
 560                 ufs_truncate_blocks(inode);
 561         }
 562 }
 563
 564 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 565                         loff_t pos, unsigned len, unsigned flags,
 566                         struct page **pagep, void **fsdata)
 567 {
 568         int ret;
 569
 570         ret = block_write_begin(mapping, pos, len, flags, pagep,
 571                                 ufs_getfrag_block);
 572         if (unlikely(ret))
 573                 ufs_write_failed(mapping, pos + len);
 574
 575         return ret;
 576 }
 577
 578 static int ufs_write_end(struct file *file, struct address_space *mapping,
 579                         loff_t pos, unsigned len, unsigned copied,
 580                         struct page *page, void *fsdata)
 581 {
 582         int ret;
 583
 584         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 585         if (ret < len)
 586                 ufs_write_failed(mapping, pos + len);
 587         return ret;
 588 }
 589
 590 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 591 {
 592         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 593 }
 594
 595 const struct address_space_operations ufs_aops = {
 596         .readpage = ufs_readpage,
 597         .writepage = ufs_writepage,
 598         .write_begin = ufs_write_begin,
 599         .write_end = ufs_write_end,
 600         .bmap = ufs_bmap
 601 };
 602
 603 static void ufs_set_inode_ops(struct inode *inode)
 604 {
 605         if (S_ISREG(inode->i_mode)) {
 606                 inode->i_op = &ufs_file_inode_operations;
 607                 inode->i_fop = &ufs_file_operations;
 608                 inode->i_mapping->a_ops = &ufs_aops;
 609         } else if (S_ISDIR(inode->i_mode)) {
 610                 inode->i_op = &ufs_dir_inode_operations;
 611                 inode->i_fop = &ufs_dir_operations;
 612                 inode->i_mapping->a_ops = &ufs_aops;
 613         } else if (S_ISLNK(inode->i_mode)) {
 614                 if (!inode->i_blocks) {
 615                         inode->i_op = &ufs_fast_symlink_inode_operations;
 616                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 617                 } else {
 618                         inode->i_op = &ufs_symlink_inode_operations;
 619                         inode->i_mapping->a_ops = &ufs_aops;
 620                 }
 621         } else
 622                 init_special_inode(inode, inode->i_mode,
 623                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 624 }
 625
 626 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 627 {
 628         struct ufs_inode_info *ufsi = UFS_I(inode);
 629         struct super_block *sb = inode->i_sb;
 630         umode_t mode;
 631
 632         /*
 633          * Copy data to the in-core inode.
 634          */
 635         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 636         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 637         if (inode->i_nlink == 0) {
 638                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 639                 return -1;
 640         }
 641
 642         /*
 643          * Linux now has 32-bit uid and gid, so we can support EFT.
 644          */
 645         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 646         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 647
 648         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 649         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 650         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 651         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 652         inode->i_mtime.tv_nsec = 0;
 653         inode->i_atime.tv_nsec = 0;
 654         inode->i_ctime.tv_nsec = 0;
 655         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 656         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 657         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 658         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 659         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 660
 661
 662         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 663                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 664                        sizeof(ufs_inode->ui_u2.ui_addr));
 665         } else {
 666                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 667                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 668                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 669         }
 670         return 0;
 671 }
 672
 673 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 674 {
 675         struct ufs_inode_info *ufsi = UFS_I(inode);
 676         struct super_block *sb = inode->i_sb;
 677         umode_t mode;
 678
 679         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 680         /*
 681          * Copy data to the in-core inode.
 682          */
 683         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 684         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 685         if (inode->i_nlink == 0) {
 686                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 687                 return -1;
 688         }
 689
 690         /*
 691          * Linux now has 32-bit uid and gid, so we can support EFT.
 692          */
 693         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 694         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 695
 696         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 697         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 698         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 699         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 700         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 701         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 702         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 703         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 704         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 705         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 706         /*
 707         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 708         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 709         */
 710
 711         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 712                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 713                        sizeof(ufs2_inode->ui_u2.ui_addr));
 714         } else {
 715                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 716                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 717                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 718         }
 719         return 0;
 720 }
 721
 722 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 723 {
 724         struct ufs_inode_info *ufsi;
 725         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 726         struct buffer_head * bh;
 727         struct inode *inode;
 728         int err;
 729
 730         UFSD("ENTER, ino %lu\n", ino);
 731
 732         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 733                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 734                             ino);
 735                 return ERR_PTR(-EIO);
 736         }
 737
 738         inode = iget_locked(sb, ino);
 739         if (!inode)
 740                 return ERR_PTR(-ENOMEM);
 741         if (!(inode->i_state & I_NEW))
 742                 return inode;
 743
 744         ufsi = UFS_I(inode);
 745
 746         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 747         if (!bh) {
 748                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 749                             inode->i_ino);
 750                 goto bad_inode;
 751         }
 752         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 753                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 754
 755                 err = ufs2_read_inode(inode,
 756                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 757         } else {
 758                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 759
 760                 err = ufs1_read_inode(inode,
 761                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 762         }
 763
 764         if (err)
 765                 goto bad_inode;
 766         inode->i_version++;
 767         ufsi->i_lastfrag =
 768                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 769         ufsi->i_dir_start_lookup = 0;
 770         ufsi->i_osync = 0;
 771
 772         ufs_set_inode_ops(inode);
 773
 774         brelse(bh);
 775
 776         UFSD("EXIT\n");
 777         unlock_new_inode(inode);
 778         return inode;
 779
 780 bad_inode:
 781         iget_failed(inode);
 782         return ERR_PTR(-EIO);
 783 }
 784
 785 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 786 {
 787         struct super_block *sb = inode->i_sb;
 788         struct ufs_inode_info *ufsi = UFS_I(inode);
 789
 790         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 791         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 792
 793         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 794         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 795
 796         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 797         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 798         ufs_inode->ui_atime.tv_usec = 0;
 799         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 800         ufs_inode->ui_ctime.tv_usec = 0;
 801         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 802         ufs_inode->ui_mtime.tv_usec = 0;
 803         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 804         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 805         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 806
 807         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 808                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 809                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 810         }
 811
 812         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 813                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 814                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 815         } else if (inode->i_blocks) {
 816                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 817                        sizeof(ufs_inode->ui_u2.ui_addr));
 818         }
 819         else {
 820                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 821                        sizeof(ufs_inode->ui_u2.ui_symlink));
 822         }
 823
 824         if (!inode->i_nlink)
 825                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 826 }
 827
 828 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 829 {
 830         struct super_block *sb = inode->i_sb;
 831         struct ufs_inode_info *ufsi = UFS_I(inode);
 832
 833         UFSD("ENTER\n");
 834         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 835         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 836
 837         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 838         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 839
 840         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 841         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 842         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 843         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 844         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 845         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 846         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 847
 848         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 849         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 850         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 851
 852         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 853                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 854                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 855         } else if (inode->i_blocks) {
 856                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 857                        sizeof(ufs_inode->ui_u2.ui_addr));
 858         } else {
 859                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 860                        sizeof(ufs_inode->ui_u2.ui_symlink));
 861         }
 862
 863         if (!inode->i_nlink)
 864                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 865         UFSD("EXIT\n");
 866 }
 867
 868 static int ufs_update_inode(struct inode * inode, int do_sync)
 869 {
 870         struct super_block *sb = inode->i_sb;
 871         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 872         struct buffer_head * bh;
 873
 874         UFSD("ENTER, ino %lu\n", inode->i_ino);
 875
 876         if (inode->i_ino < UFS_ROOTINO ||
 877             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 878                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 879                 return -1;
 880         }
 881
 882         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 883         if (!bh) {
 884                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 885                 return -1;
 886         }
 887         if (uspi->fs_magic == UFS2_MAGIC) {
 888                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 889
 890                 ufs2_update_inode(inode,
 891                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 892         } else {
 893                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 894
 895                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 896         }
 897
 898         mark_buffer_dirty(bh);
 899         if (do_sync)
 900                 sync_dirty_buffer(bh);
 901         brelse (bh);
 902
 903         UFSD("EXIT\n");
 904         return 0;
 905 }
 906
 907 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 908 {
 909         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 910 }
 911
 912 int ufs_sync_inode (struct inode *inode)
 913 {
 914         return ufs_update_inode (inode, 1);
 915 }
 916
 917 void ufs_evict_inode(struct inode * inode)
 918 {
 919         int want_delete = 0;
 920
 921         if (!inode->i_nlink && !is_bad_inode(inode))
 922                 want_delete = 1;
 923
 924         truncate_inode_pages_final(&inode->i_data);
 925         if (want_delete) {
 926                 inode->i_size = 0;
 927                 if (inode->i_blocks)
 928                         ufs_truncate_blocks(inode);
 929         }
 930
 931         invalidate_inode_buffers(inode);
 932         clear_inode(inode);
 933
 934         if (want_delete)
 935                 ufs_free_inode(inode);
 936 }
 937
 938 struct to_free {
 939         struct inode *inode;
 940         u64 to;
 941         unsigned count;
 942 };
 943
 944 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 945 {
 946         if (ctx->count && ctx->to != from) {
 947                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 948                 ctx->count = 0;
 949         }
 950         ctx->count += count;
 951         ctx->to = from + count;
 952 }
 953
 954 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 955 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 956
 957 static void ufs_trunc_direct(struct inode *inode)
 958 {
 959         struct ufs_inode_info *ufsi = UFS_I(inode);
 960         struct super_block * sb;
 961         struct ufs_sb_private_info * uspi;
 962         void *p;
 963         u64 frag1, frag2, frag3, frag4, block1, block2;
 964         struct to_free ctx = {.inode = inode};
 965         unsigned i, tmp;
 966
 967         UFSD("ENTER: ino %lu\n", inode->i_ino);
 968
 969         sb = inode->i_sb;
 970         uspi = UFS_SB(sb)->s_uspi;
 971
 972         frag1 = DIRECT_FRAGMENT;
 973         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 974         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 975         frag3 = frag4 & ~uspi->s_fpbmask;
 976         block1 = block2 = 0;
 977         if (frag2 > frag3) {
 978                 frag2 = frag4;
 979                 frag3 = frag4 = 0;
 980         } else if (frag2 < frag3) {
 981                 block1 = ufs_fragstoblks (frag2);
 982                 block2 = ufs_fragstoblks (frag3);
 983         }
 984
 985         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 986              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 987              (unsigned long long)frag1, (unsigned long long)frag2,
 988              (unsigned long long)block1, (unsigned long long)block2,
 989              (unsigned long long)frag3, (unsigned long long)frag4);
 990
 991         if (frag1 >= frag2)
 992                 goto next1;
 993
 994         /*
 995          * Free first free fragments
 996          */
 997         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 998         tmp = ufs_data_ptr_to_cpu(sb, p);
 999         if (!tmp )
1000                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
1001         frag2 -= frag1;
1002         frag1 = ufs_fragnum (frag1);
1003
1004         ufs_free_fragments(inode, tmp + frag1, frag2);
1005
1006 next1:
1007         /*
1008          * Free whole blocks
1009          */
1010         for (i = block1 ; i < block2; i++) {
1011                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1012                 tmp = ufs_data_ptr_to_cpu(sb, p);
1013                 if (!tmp)
1014                         continue;
1015                 write_seqlock(&ufsi->meta_lock);
1016                 ufs_data_ptr_clear(uspi, p);
1017                 write_sequnlock(&ufsi->meta_lock);
1018
1019                 free_data(&ctx, tmp, uspi->s_fpb);
1020         }
1021
1022         free_data(&ctx, 0, 0);
1023
1024         if (frag3 >= frag4)
1025                 goto next3;
1026
1027         /*
1028          * Free last free fragments
1029          */
1030         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
1031         tmp = ufs_data_ptr_to_cpu(sb, p);
1032         if (!tmp )
1033                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
1034         frag4 = ufs_fragnum (frag4);
1035         write_seqlock(&ufsi->meta_lock);
1036         ufs_data_ptr_clear(uspi, p);
1037         write_sequnlock(&ufsi->meta_lock);
1038
1039         ufs_free_fragments (inode, tmp, frag4);
1040  next3:
1041
1042         UFSD("EXIT: ino %lu\n", inode->i_ino);
1043 }
1044
1045 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
1046 {
1047         struct super_block *sb = inode->i_sb;
1048         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1049         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
1050         unsigned i;
1051
1052         if (!ubh)
1053                 return;
1054
1055         if (--depth) {
1056                 for (i = 0; i < uspi->s_apb; i++) {
1057                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1058                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1059                         if (block)
1060                                 free_full_branch(inode, block, depth);
1061                 }
1062         } else {
1063                 struct to_free ctx = {.inode = inode};
1064
1065                 for (i = 0; i < uspi->s_apb; i++) {
1066                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1067                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1068                         if (block)
1069                                 free_data(&ctx, block, uspi->s_fpb);
1070                 }
1071                 free_data(&ctx, 0, 0);
1072         }
1073
1074         ubh_bforget(ubh);
1075         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1076 }
1077
1078 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1079 {
1080         struct super_block *sb = inode->i_sb;
1081         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1082         unsigned i;
1083
1084         if (--depth) {
1085                 for (i = from; i < uspi->s_apb ; i++) {
1086                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1087                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1088                         if (block) {
1089                                 write_seqlock(&UFS_I(inode)->meta_lock);
1090                                 ufs_data_ptr_clear(uspi, p);
1091                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1092                                 ubh_mark_buffer_dirty(ubh);
1093                                 free_full_branch(inode, block, depth);
1094                         }
1095                 }
1096         } else {
1097                 struct to_free ctx = {.inode = inode};
1098
1099                 for (i = from; i < uspi->s_apb; i++) {
1100                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1101                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1102                         if (block) {
1103                                 write_seqlock(&UFS_I(inode)->meta_lock);
1104                                 ufs_data_ptr_clear(uspi, p);
1105                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1106                                 ubh_mark_buffer_dirty(ubh);
1107                                 free_data(&ctx, block, uspi->s_fpb);
1108                         }
1109                 }
1110                 free_data(&ctx, 0, 0);
1111         }
1112         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1113                 ubh_sync_block(ubh);
1114         ubh_brelse(ubh);
1115 }
1116
1117 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1118 {
1119         int err = 0;
1120         struct super_block *sb = inode->i_sb;
1121         struct address_space *mapping = inode->i_mapping;
1122         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1123         unsigned i, end;
1124         sector_t lastfrag;
1125         struct page *lastpage;
1126         struct buffer_head *bh;
1127         u64 phys64;
1128
1129         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1130
1131         if (!lastfrag)
1132                 goto out;
1133
1134         lastfrag--;
1135
1136         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1137                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1138        if (IS_ERR(lastpage)) {
1139                err = -EIO;
1140                goto out;
1141        }
1142
1143        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1144        bh = page_buffers(lastpage);
1145        for (i = 0; i < end; ++i)
1146                bh = bh->b_this_page;
1147
1148
1149        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1150
1151        if (unlikely(err))
1152                goto out_unlock;
1153
1154        if (buffer_new(bh)) {
1155                clear_buffer_new(bh);
1156                unmap_underlying_metadata(bh->b_bdev,
1157                                          bh->b_blocknr);
1158                /*
1159                 * we do not zeroize fragment, because of
1160                 * if it maped to hole, it already contains zeroes
1161                 */
1162                set_buffer_uptodate(bh);
1163                mark_buffer_dirty(bh);
1164                set_page_dirty(lastpage);
1165        }
1166
1167        if (lastfrag >= UFS_IND_FRAGMENT) {
1168                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1169                phys64 = bh->b_blocknr + 1;
1170                for (i = 0; i < end; ++i) {
1171                        bh = sb_getblk(sb, i + phys64);
1172                        lock_buffer(bh);
1173                        memset(bh->b_data, 0, sb->s_blocksize);
1174                        set_buffer_uptodate(bh);
1175                        mark_buffer_dirty(bh);
1176                        unlock_buffer(bh);
1177                        sync_dirty_buffer(bh);
1178                        brelse(bh);
1179                }
1180        }
1181 out_unlock:
1182        ufs_put_locked_page(lastpage);
1183 out:
1184        return err;
1185 }
1186
1187 static void __ufs_truncate_blocks(struct inode *inode)
1188 {
1189         struct ufs_inode_info *ufsi = UFS_I(inode);
1190         struct super_block *sb = inode->i_sb;
1191         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1192         unsigned offsets[4];
1193         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1194         int depth2;
1195         unsigned i;
1196         struct ufs_buffer_head *ubh[3];
1197         void *p;
1198         u64 block;
1199
1200         if (!depth)
1201                 return;
1202
1203         /* find the last non-zero in offsets[] */
1204         for (depth2 = depth - 1; depth2; depth2--)
1205                 if (offsets[depth2])
1206                         break;
1207
1208         mutex_lock(&ufsi->truncate_mutex);
1209         if (depth == 1) {
1210                 ufs_trunc_direct(inode);
1211                 offsets[0] = UFS_IND_BLOCK;
1212         } else {
1213                 /* get the blocks that should be partially emptied */
1214                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1215                 for (i = 0; i < depth2; i++) {
1216                         offsets[i]++;   /* next branch is fully freed */
1217                         block = ufs_data_ptr_to_cpu(sb, p);
1218                         if (!block)
1219                                 break;
1220                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1221                         if (!ubh[i]) {
1222                                 write_seqlock(&ufsi->meta_lock);
1223                                 ufs_data_ptr_clear(uspi, p);
1224                                 write_sequnlock(&ufsi->meta_lock);
1225                                 break;
1226                         }
1227                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1228                 }
1229                 while (i--)
1230                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1231         }
1232         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1233                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1234                 block = ufs_data_ptr_to_cpu(sb, p);
1235                 if (block) {
1236                         write_seqlock(&ufsi->meta_lock);
1237                         ufs_data_ptr_clear(uspi, p);
1238                         write_sequnlock(&ufsi->meta_lock);
1239                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1240                 }
1241         }
1242         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1243         mark_inode_dirty(inode);
1244         mutex_unlock(&ufsi->truncate_mutex);
1245 }
1246
1247 static int ufs_truncate(struct inode *inode, loff_t size)
1248 {
1249         int err = 0;
1250
1251         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1252              inode->i_ino, (unsigned long long)size,
1253              (unsigned long long)i_size_read(inode));
1254
1255         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1256               S_ISLNK(inode->i_mode)))
1257                 return -EINVAL;
1258         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1259                 return -EPERM;
1260
1261         err = ufs_alloc_lastblock(inode, size);
1262
1263         if (err)
1264                 goto out;
1265
1266         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1267
1268         truncate_setsize(inode, size);
1269
1270         __ufs_truncate_blocks(inode);
1271         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1272         mark_inode_dirty(inode);
1273 out:
1274         UFSD("EXIT: err %d\n", err);
1275         return err;
1276 }
1277
1278 void ufs_truncate_blocks(struct inode *inode)
1279 {
1280         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1281               S_ISLNK(inode->i_mode)))
1282                 return;
1283         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1284                 return;
1285         __ufs_truncate_blocks(inode);
1286 }
1287
1288 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1289 {
1290         struct inode *inode = d_inode(dentry);
1291         unsigned int ia_valid = attr->ia_valid;
1292         int error;
1293
1294         error = inode_change_ok(inode, attr);
1295         if (error)
1296                 return error;
1297
1298         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1299                 error = ufs_truncate(inode, attr->ia_size);
1300                 if (error)
1301                         return error;
1302         }
1303
1304         setattr_copy(inode, attr);
1305         mark_inode_dirty(inode);
1306         return 0;
1307 }
1308
1309 const struct inode_operations ufs_file_inode_operations = {
1310         .setattr = ufs_setattr,
1311 };