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