fs/ufs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ufs/inode.c
   4  *
   5  * Copyright (C) 1998
   6  * Daniel Pirkl <daniel.pirkl@email.cz>
   7  * Charles University, Faculty of Mathematics and Physics
   8  *
   9  *  from
  10  *
  11  *  linux/fs/ext2/inode.c
  12  *
  13  * Copyright (C) 1992, 1993, 1994, 1995
  14  * Remy Card (card@masi.ibp.fr)
  15  * Laboratoire MASI - Institut Blaise Pascal
  16  * Universite Pierre et Marie Curie (Paris VI)
  17  *
  18  *  from
  19  *
  20  *  linux/fs/minix/inode.c
  21  *
  22  *  Copyright (C) 1991, 1992  Linus Torvalds
  23  *
  24  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  25  *  Big-endian to little-endian byte-swapping/bitmaps by
  26  *        David S. Miller (davem@caip.rutgers.edu), 1995
  27  */
  28
  29 #include <linux/uaccess.h>
  30
  31 #include <linux/errno.h>
  32 #include <linux/fs.h>
  33 #include <linux/time.h>
  34 #include <linux/stat.h>
  35 #include <linux/string.h>
  36 #include <linux/mm.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39
  40 #include "ufs_fs.h"
  41 #include "ufs.h"
  42 #include "swab.h"
  43 #include "util.h"
  44
  45 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  46 {
  47         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  48         int ptrs = uspi->s_apb;
  49         int ptrs_bits = uspi->s_apbshift;
  50         const long direct_blocks = UFS_NDADDR,
  51                 indirect_blocks = ptrs,
  52                 double_blocks = (1 << (ptrs_bits * 2));
  53         int n = 0;
  54
  55
  56         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  57         if (i_block < direct_blocks) {
  58                 offsets[n++] = i_block;
  59         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  60                 offsets[n++] = UFS_IND_BLOCK;
  61                 offsets[n++] = i_block;
  62         } else if ((i_block -= indirect_blocks) < double_blocks) {
  63                 offsets[n++] = UFS_DIND_BLOCK;
  64                 offsets[n++] = i_block >> ptrs_bits;
  65                 offsets[n++] = i_block & (ptrs - 1);
  66         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  67                 offsets[n++] = UFS_TIND_BLOCK;
  68                 offsets[n++] = i_block >> (ptrs_bits * 2);
  69                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  70                 offsets[n++] = i_block & (ptrs - 1);
  71         } else {
  72                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  73         }
  74         return n;
  75 }
  76
  77 typedef struct {
  78         void    *p;
  79         union {
  80                 __fs32  key32;
  81                 __fs64  key64;
  82         };
  83         struct buffer_head *bh;
  84 } Indirect;
  85
  86 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  87                                struct buffer_head *bh, __fs32 *v,
  88                                Indirect *from, Indirect *to)
  89 {
  90         Indirect *p;
  91         unsigned seq;
  92         to->bh = bh;
  93         do {
  94                 seq = read_seqbegin(&ufsi->meta_lock);
  95                 to->key32 = *(__fs32 *)(to->p = v);
  96                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  97                         ;
  98         } while (read_seqretry(&ufsi->meta_lock, seq));
  99         return (p > to);
 100 }
 101
 102 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 103                                struct buffer_head *bh, __fs64 *v,
 104                                Indirect *from, Indirect *to)
 105 {
 106         Indirect *p;
 107         unsigned seq;
 108         to->bh = bh;
 109         do {
 110                 seq = read_seqbegin(&ufsi->meta_lock);
 111                 to->key64 = *(__fs64 *)(to->p = v);
 112                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 113                         ;
 114         } while (read_seqretry(&ufsi->meta_lock, seq));
 115         return (p > to);
 116 }
 117
 118 /*
 119  * Returns the location of the fragment from
 120  * the beginning of the filesystem.
 121  */
 122
 123 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 124 {
 125         struct ufs_inode_info *ufsi = UFS_I(inode);
 126         struct super_block *sb = inode->i_sb;
 127         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 128         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 129         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 130         Indirect chain[4], *q = chain;
 131         unsigned *p;
 132         unsigned flags = UFS_SB(sb)->s_flags;
 133         u64 res = 0;
 134
 135         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 136                 uspi->s_fpbshift, uspi->s_apbmask,
 137                 (unsigned long long)mask);
 138
 139         if (depth == 0)
 140                 goto no_block;
 141
 142 again:
 143         p = offsets;
 144
 145         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 146                 goto ufs2;
 147
 148         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 149                 goto changed;
 150         if (!q->key32)
 151                 goto no_block;
 152         while (--depth) {
 153                 __fs32 *ptr;
 154                 struct buffer_head *bh;
 155                 unsigned n = *p++;
 156
 157                 bh = sb_bread(sb, uspi->s_sbbase +
 158                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 159                 if (!bh)
 160                         goto no_block;
 161                 ptr = (__fs32 *)bh->b_data + (n & mask);
 162                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 163                         goto changed;
 164                 if (!q->key32)
 165                         goto no_block;
 166         }
 167         res = fs32_to_cpu(sb, q->key32);
 168         goto found;
 169
 170 ufs2:
 171         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 172                 goto changed;
 173         if (!q->key64)
 174                 goto no_block;
 175
 176         while (--depth) {
 177                 __fs64 *ptr;
 178                 struct buffer_head *bh;
 179                 unsigned n = *p++;
 180
 181                 bh = sb_bread(sb, uspi->s_sbbase +
 182                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 183                 if (!bh)
 184                         goto no_block;
 185                 ptr = (__fs64 *)bh->b_data + (n & mask);
 186                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 187                         goto changed;
 188                 if (!q->key64)
 189                         goto no_block;
 190         }
 191         res = fs64_to_cpu(sb, q->key64);
 192 found:
 193         res += uspi->s_sbbase;
 194 no_block:
 195         while (q > chain) {
 196                 brelse(q->bh);
 197                 q--;
 198         }
 199         return res;
 200
 201 changed:
 202         while (q > chain) {
 203                 brelse(q->bh);
 204                 q--;
 205         }
 206         goto again;
 207 }
 208
 209 /*
 210  * Unpacking tails: we have a file with partial final block and
 211  * we had been asked to extend it.  If the fragment being written
 212  * is within the same block, we need to extend the tail just to cover
 213  * that fragment.  Otherwise the tail is extended to full block.
 214  *
 215  * Note that we might need to create a _new_ tail, but that will
 216  * be handled elsewhere; this is strictly for resizing old
 217  * ones.
 218  */
 219 static bool
 220 ufs_extend_tail(struct inode *inode, u64 writes_to,
 221                   int *err, struct page *locked_page)
 222 {
 223         struct ufs_inode_info *ufsi = UFS_I(inode);
 224         struct super_block *sb = inode->i_sb;
 225         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 226         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 227         unsigned block = ufs_fragstoblks(lastfrag);
 228         unsigned new_size;
 229         void *p;
 230         u64 tmp;
 231
 232         if (writes_to < (lastfrag | uspi->s_fpbmask))
 233                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 234         else
 235                 new_size = uspi->s_fpb;
 236
 237         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 238         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 239                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 240                                 locked_page);
 241         return tmp != 0;
 242 }
 243
 244 /**
 245  * ufs_inode_getfrag() - allocate new fragment(s)
 246  * @inode: pointer to inode
 247  * @index: number of block pointer within the inode's array.
 248  * @new_fragment: number of new allocated fragment(s)
 249  * @err: we set it if something wrong
 250  * @new: we set it if we allocate new block
 251  * @locked_page: for ufs_new_fragments()
 252  */
 253 static u64
 254 ufs_inode_getfrag(struct inode *inode, unsigned index,
 255                   sector_t new_fragment, int *err,
 256                   int *new, struct page *locked_page)
 257 {
 258         struct ufs_inode_info *ufsi = UFS_I(inode);
 259         struct super_block *sb = inode->i_sb;
 260         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 261         u64 tmp, goal, lastfrag;
 262         unsigned nfrags = uspi->s_fpb;
 263         void *p;
 264
 265         /* TODO : to be done for write support
 266         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 267              goto ufs2;
 268          */
 269
 270         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 271         tmp = ufs_data_ptr_to_cpu(sb, p);
 272         if (tmp)
 273                 goto out;
 274
 275         lastfrag = ufsi->i_lastfrag;
 276
 277         /* will that be a new tail? */
 278         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 279                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 280
 281         goal = 0;
 282         if (index) {
 283                 goal = ufs_data_ptr_to_cpu(sb,
 284                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 285                 if (goal)
 286                         goal += uspi->s_fpb;
 287         }
 288         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 289                                 goal, nfrags, err, locked_page);
 290
 291         if (!tmp) {
 292                 *err = -ENOSPC;
 293                 return 0;
 294         }
 295
 296         if (new)
 297                 *new = 1;
 298         inode->i_ctime = current_time(inode);
 299         if (IS_SYNC(inode))
 300                 ufs_sync_inode (inode);
 301         mark_inode_dirty(inode);
 302 out:
 303         return tmp + uspi->s_sbbase;
 304
 305      /* This part : To be implemented ....
 306         Required only for writing, not required for READ-ONLY.
 307 ufs2:
 308
 309         u2_block = ufs_fragstoblks(fragment);
 310         u2_blockoff = ufs_fragnum(fragment);
 311         p = ufsi->i_u1.u2_i_data + block;
 312         goal = 0;
 313
 314 repeat2:
 315         tmp = fs32_to_cpu(sb, *p);
 316         lastfrag = ufsi->i_lastfrag;
 317
 318      */
 319 }
 320
 321 /**
 322  * ufs_inode_getblock() - allocate new block
 323  * @inode: pointer to inode
 324  * @ind_block: block number of the indirect block
 325  * @index: number of pointer within the indirect block
 326  * @new_fragment: number of new allocated fragment
 327  *  (block will hold this fragment and also uspi->s_fpb-1)
 328  * @err: see ufs_inode_getfrag()
 329  * @new: see ufs_inode_getfrag()
 330  * @locked_page: see ufs_inode_getfrag()
 331  */
 332 static u64
 333 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 334                   unsigned index, sector_t new_fragment, int *err,
 335                   int *new, struct page *locked_page)
 336 {
 337         struct super_block *sb = inode->i_sb;
 338         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 339         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 340         u64 tmp = 0, goal;
 341         struct buffer_head *bh;
 342         void *p;
 343
 344         if (!ind_block)
 345                 return 0;
 346
 347         bh = sb_bread(sb, ind_block + (index >> shift));
 348         if (unlikely(!bh)) {
 349                 *err = -EIO;
 350                 return 0;
 351         }
 352
 353         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 354         if (uspi->fs_magic == UFS2_MAGIC)
 355                 p = (__fs64 *)bh->b_data + index;
 356         else
 357                 p = (__fs32 *)bh->b_data + index;
 358
 359         tmp = ufs_data_ptr_to_cpu(sb, p);
 360         if (tmp)
 361                 goto out;
 362
 363         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 364                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 365                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 366                 goal = tmp + uspi->s_fpb;
 367         else
 368                 goal = bh->b_blocknr + uspi->s_fpb;
 369         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 370                                 uspi->s_fpb, err, locked_page);
 371         if (!tmp)
 372                 goto out;
 373
 374         if (new)
 375                 *new = 1;
 376
 377         mark_buffer_dirty(bh);
 378         if (IS_SYNC(inode))
 379                 sync_dirty_buffer(bh);
 380         inode->i_ctime = current_time(inode);
 381         mark_inode_dirty(inode);
 382 out:
 383         brelse (bh);
 384         UFSD("EXIT\n");
 385         if (tmp)
 386                 tmp += uspi->s_sbbase;
 387         return tmp;
 388 }
 389
 390 /**
 391  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 392  * readpage, writepage and so on
 393  */
 394
 395 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 396 {
 397         struct super_block *sb = inode->i_sb;
 398         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 399         int err = 0, new = 0;
 400         unsigned offsets[4];
 401         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 402         u64 phys64 = 0;
 403         unsigned frag = fragment & uspi->s_fpbmask;
 404
 405         phys64 = ufs_frag_map(inode, offsets, depth);
 406         if (!create)
 407                 goto done;
 408
 409         if (phys64) {
 410                 if (fragment >= UFS_NDIR_FRAGMENT)
 411                         goto done;
 412                 read_seqlock_excl(&UFS_I(inode)->meta_lock);
 413                 if (fragment < UFS_I(inode)->i_lastfrag) {
 414                         read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 415                         goto done;
 416                 }
 417                 read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 418         }
 419         /* This code entered only while writing ....? */
 420
 421         mutex_lock(&UFS_I(inode)->truncate_mutex);
 422
 423         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 424         if (unlikely(!depth)) {
 425                 ufs_warning(sb, "ufs_get_block", "block > big");
 426                 err = -EIO;
 427                 goto out;
 428         }
 429
 430         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 431                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 432                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 433                 if (tailfrags && fragment >= lastfrag) {
 434                         if (!ufs_extend_tail(inode, fragment,
 435                                              &err, bh_result->b_page))
 436                                 goto out;
 437                 }
 438         }
 439
 440         if (depth == 1) {
 441                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 442                                            &err, &new, bh_result->b_page);
 443         } else {
 444                 int i;
 445                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 446                                            &err, NULL, NULL);
 447                 for (i = 1; i < depth - 1; i++)
 448                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 449                                                 fragment, &err, NULL, NULL);
 450                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 451                                         fragment, &err, &new, bh_result->b_page);
 452         }
 453 out:
 454         if (phys64) {
 455                 phys64 += frag;
 456                 map_bh(bh_result, sb, phys64);
 457                 if (new)
 458                         set_buffer_new(bh_result);
 459         }
 460         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 461         return err;
 462
 463 done:
 464         if (phys64)
 465                 map_bh(bh_result, sb, phys64 + frag);
 466         return 0;
 467 }
 468
 469 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 470 {
 471         return block_write_full_page(page,ufs_getfrag_block,wbc);
 472 }
 473
 474 static int ufs_readpage(struct file *file, struct page *page)
 475 {
 476         return block_read_full_page(page,ufs_getfrag_block);
 477 }
 478
 479 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 480 {
 481         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 482 }
 483
 484 static void ufs_truncate_blocks(struct inode *);
 485
 486 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 487 {
 488         struct inode *inode = mapping->host;
 489
 490         if (to > inode->i_size) {
 491                 truncate_pagecache(inode, inode->i_size);
 492                 ufs_truncate_blocks(inode);
 493         }
 494 }
 495
 496 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 497                         loff_t pos, unsigned len, unsigned flags,
 498                         struct page **pagep, void **fsdata)
 499 {
 500         int ret;
 501
 502         ret = block_write_begin(mapping, pos, len, flags, pagep,
 503                                 ufs_getfrag_block);
 504         if (unlikely(ret))
 505                 ufs_write_failed(mapping, pos + len);
 506
 507         return ret;
 508 }
 509
 510 static int ufs_write_end(struct file *file, struct address_space *mapping,
 511                         loff_t pos, unsigned len, unsigned copied,
 512                         struct page *page, void *fsdata)
 513 {
 514         int ret;
 515
 516         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 517         if (ret < len)
 518                 ufs_write_failed(mapping, pos + len);
 519         return ret;
 520 }
 521
 522 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 523 {
 524         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 525 }
 526
 527 const struct address_space_operations ufs_aops = {
 528         .readpage = ufs_readpage,
 529         .writepage = ufs_writepage,
 530         .write_begin = ufs_write_begin,
 531         .write_end = ufs_write_end,
 532         .bmap = ufs_bmap
 533 };
 534
 535 static void ufs_set_inode_ops(struct inode *inode)
 536 {
 537         if (S_ISREG(inode->i_mode)) {
 538                 inode->i_op = &ufs_file_inode_operations;
 539                 inode->i_fop = &ufs_file_operations;
 540                 inode->i_mapping->a_ops = &ufs_aops;
 541         } else if (S_ISDIR(inode->i_mode)) {
 542                 inode->i_op = &ufs_dir_inode_operations;
 543                 inode->i_fop = &ufs_dir_operations;
 544                 inode->i_mapping->a_ops = &ufs_aops;
 545         } else if (S_ISLNK(inode->i_mode)) {
 546                 if (!inode->i_blocks) {
 547                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 548                         inode->i_op = &simple_symlink_inode_operations;
 549                 } else {
 550                         inode->i_mapping->a_ops = &ufs_aops;
 551                         inode->i_op = &page_symlink_inode_operations;
 552                         inode_nohighmem(inode);
 553                 }
 554         } else
 555                 init_special_inode(inode, inode->i_mode,
 556                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 557 }
 558
 559 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 560 {
 561         struct ufs_inode_info *ufsi = UFS_I(inode);
 562         struct super_block *sb = inode->i_sb;
 563         umode_t mode;
 564
 565         /*
 566          * Copy data to the in-core inode.
 567          */
 568         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 569         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 570         if (inode->i_nlink == 0)
 571                 return -ESTALE;
 572
 573         /*
 574          * Linux now has 32-bit uid and gid, so we can support EFT.
 575          */
 576         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 577         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 578
 579         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 580         inode->i_atime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 581         inode->i_ctime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 582         inode->i_mtime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 583         inode->i_mtime.tv_nsec = 0;
 584         inode->i_atime.tv_nsec = 0;
 585         inode->i_ctime.tv_nsec = 0;
 586         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 587         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 588         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 589         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 590         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 591
 592
 593         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 594                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 595                        sizeof(ufs_inode->ui_u2.ui_addr));
 596         } else {
 597                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 598                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 599                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 600         }
 601         return 0;
 602 }
 603
 604 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 605 {
 606         struct ufs_inode_info *ufsi = UFS_I(inode);
 607         struct super_block *sb = inode->i_sb;
 608         umode_t mode;
 609
 610         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 611         /*
 612          * Copy data to the in-core inode.
 613          */
 614         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 615         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 616         if (inode->i_nlink == 0)
 617                 return -ESTALE;
 618
 619         /*
 620          * Linux now has 32-bit uid and gid, so we can support EFT.
 621          */
 622         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 623         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 624
 625         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 626         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 627         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 628         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 629         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 630         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 631         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 632         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 633         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 634         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 635         /*
 636         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 637         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 638         */
 639
 640         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 641                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 642                        sizeof(ufs2_inode->ui_u2.ui_addr));
 643         } else {
 644                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 645                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 646                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 647         }
 648         return 0;
 649 }
 650
 651 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 652 {
 653         struct ufs_inode_info *ufsi;
 654         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 655         struct buffer_head * bh;
 656         struct inode *inode;
 657         int err = -EIO;
 658
 659         UFSD("ENTER, ino %lu\n", ino);
 660
 661         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 662                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 663                             ino);
 664                 return ERR_PTR(-EIO);
 665         }
 666
 667         inode = iget_locked(sb, ino);
 668         if (!inode)
 669                 return ERR_PTR(-ENOMEM);
 670         if (!(inode->i_state & I_NEW))
 671                 return inode;
 672
 673         ufsi = UFS_I(inode);
 674
 675         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 676         if (!bh) {
 677                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 678                             inode->i_ino);
 679                 goto bad_inode;
 680         }
 681         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 682                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 683
 684                 err = ufs2_read_inode(inode,
 685                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 686         } else {
 687                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 688
 689                 err = ufs1_read_inode(inode,
 690                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 691         }
 692         brelse(bh);
 693         if (err)
 694                 goto bad_inode;
 695
 696         inode->i_version++;
 697         ufsi->i_lastfrag =
 698                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 699         ufsi->i_dir_start_lookup = 0;
 700         ufsi->i_osync = 0;
 701
 702         ufs_set_inode_ops(inode);
 703
 704         UFSD("EXIT\n");
 705         unlock_new_inode(inode);
 706         return inode;
 707
 708 bad_inode:
 709         iget_failed(inode);
 710         return ERR_PTR(err);
 711 }
 712
 713 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 714 {
 715         struct super_block *sb = inode->i_sb;
 716         struct ufs_inode_info *ufsi = UFS_I(inode);
 717
 718         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 719         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 720
 721         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 722         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 723
 724         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 725         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 726         ufs_inode->ui_atime.tv_usec = 0;
 727         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 728         ufs_inode->ui_ctime.tv_usec = 0;
 729         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 730         ufs_inode->ui_mtime.tv_usec = 0;
 731         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 732         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 733         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 734
 735         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 736                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 737                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 738         }
 739
 740         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 741                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 742                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 743         } else if (inode->i_blocks) {
 744                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 745                        sizeof(ufs_inode->ui_u2.ui_addr));
 746         }
 747         else {
 748                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 749                        sizeof(ufs_inode->ui_u2.ui_symlink));
 750         }
 751
 752         if (!inode->i_nlink)
 753                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 754 }
 755
 756 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 757 {
 758         struct super_block *sb = inode->i_sb;
 759         struct ufs_inode_info *ufsi = UFS_I(inode);
 760
 761         UFSD("ENTER\n");
 762         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 763         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 764
 765         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 766         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 767
 768         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 769         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 770         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 771         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 772         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 773         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 774         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 775
 776         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 777         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 778         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 779
 780         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 781                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 782                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 783         } else if (inode->i_blocks) {
 784                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 785                        sizeof(ufs_inode->ui_u2.ui_addr));
 786         } else {
 787                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 788                        sizeof(ufs_inode->ui_u2.ui_symlink));
 789         }
 790
 791         if (!inode->i_nlink)
 792                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 793         UFSD("EXIT\n");
 794 }
 795
 796 static int ufs_update_inode(struct inode * inode, int do_sync)
 797 {
 798         struct super_block *sb = inode->i_sb;
 799         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 800         struct buffer_head * bh;
 801
 802         UFSD("ENTER, ino %lu\n", inode->i_ino);
 803
 804         if (inode->i_ino < UFS_ROOTINO ||
 805             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 806                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 807                 return -1;
 808         }
 809
 810         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 811         if (!bh) {
 812                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 813                 return -1;
 814         }
 815         if (uspi->fs_magic == UFS2_MAGIC) {
 816                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 817
 818                 ufs2_update_inode(inode,
 819                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 820         } else {
 821                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 822
 823                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 824         }
 825
 826         mark_buffer_dirty(bh);
 827         if (do_sync)
 828                 sync_dirty_buffer(bh);
 829         brelse (bh);
 830
 831         UFSD("EXIT\n");
 832         return 0;
 833 }
 834
 835 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 836 {
 837         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 838 }
 839
 840 int ufs_sync_inode (struct inode *inode)
 841 {
 842         return ufs_update_inode (inode, 1);
 843 }
 844
 845 void ufs_evict_inode(struct inode * inode)
 846 {
 847         int want_delete = 0;
 848
 849         if (!inode->i_nlink && !is_bad_inode(inode))
 850                 want_delete = 1;
 851
 852         truncate_inode_pages_final(&inode->i_data);
 853         if (want_delete) {
 854                 inode->i_size = 0;
 855                 if (inode->i_blocks &&
 856                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 857                      S_ISLNK(inode->i_mode)))
 858                         ufs_truncate_blocks(inode);
 859                 ufs_update_inode(inode, inode_needs_sync(inode));
 860         }
 861
 862         invalidate_inode_buffers(inode);
 863         clear_inode(inode);
 864
 865         if (want_delete)
 866                 ufs_free_inode(inode);
 867 }
 868
 869 struct to_free {
 870         struct inode *inode;
 871         u64 to;
 872         unsigned count;
 873 };
 874
 875 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 876 {
 877         if (ctx->count && ctx->to != from) {
 878                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 879                 ctx->count = 0;
 880         }
 881         ctx->count += count;
 882         ctx->to = from + count;
 883 }
 884
 885 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 886
 887 static void ufs_trunc_direct(struct inode *inode)
 888 {
 889         struct ufs_inode_info *ufsi = UFS_I(inode);
 890         struct super_block * sb;
 891         struct ufs_sb_private_info * uspi;
 892         void *p;
 893         u64 frag1, frag2, frag3, frag4, block1, block2;
 894         struct to_free ctx = {.inode = inode};
 895         unsigned i, tmp;
 896
 897         UFSD("ENTER: ino %lu\n", inode->i_ino);
 898
 899         sb = inode->i_sb;
 900         uspi = UFS_SB(sb)->s_uspi;
 901
 902         frag1 = DIRECT_FRAGMENT;
 903         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 904         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 905         frag3 = frag4 & ~uspi->s_fpbmask;
 906         block1 = block2 = 0;
 907         if (frag2 > frag3) {
 908                 frag2 = frag4;
 909                 frag3 = frag4 = 0;
 910         } else if (frag2 < frag3) {
 911                 block1 = ufs_fragstoblks (frag2);
 912                 block2 = ufs_fragstoblks (frag3);
 913         }
 914
 915         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 916              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 917              (unsigned long long)frag1, (unsigned long long)frag2,
 918              (unsigned long long)block1, (unsigned long long)block2,
 919              (unsigned long long)frag3, (unsigned long long)frag4);
 920
 921         if (frag1 >= frag2)
 922                 goto next1;
 923
 924         /*
 925          * Free first free fragments
 926          */
 927         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 928         tmp = ufs_data_ptr_to_cpu(sb, p);
 929         if (!tmp )
 930                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 931         frag2 -= frag1;
 932         frag1 = ufs_fragnum (frag1);
 933
 934         ufs_free_fragments(inode, tmp + frag1, frag2);
 935
 936 next1:
 937         /*
 938          * Free whole blocks
 939          */
 940         for (i = block1 ; i < block2; i++) {
 941                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 942                 tmp = ufs_data_ptr_to_cpu(sb, p);
 943                 if (!tmp)
 944                         continue;
 945                 write_seqlock(&ufsi->meta_lock);
 946                 ufs_data_ptr_clear(uspi, p);
 947                 write_sequnlock(&ufsi->meta_lock);
 948
 949                 free_data(&ctx, tmp, uspi->s_fpb);
 950         }
 951
 952         free_data(&ctx, 0, 0);
 953
 954         if (frag3 >= frag4)
 955                 goto next3;
 956
 957         /*
 958          * Free last free fragments
 959          */
 960         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 961         tmp = ufs_data_ptr_to_cpu(sb, p);
 962         if (!tmp )
 963                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 964         frag4 = ufs_fragnum (frag4);
 965         write_seqlock(&ufsi->meta_lock);
 966         ufs_data_ptr_clear(uspi, p);
 967         write_sequnlock(&ufsi->meta_lock);
 968
 969         ufs_free_fragments (inode, tmp, frag4);
 970  next3:
 971
 972         UFSD("EXIT: ino %lu\n", inode->i_ino);
 973 }
 974
 975 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 976 {
 977         struct super_block *sb = inode->i_sb;
 978         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 979         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 980         unsigned i;
 981
 982         if (!ubh)
 983                 return;
 984
 985         if (--depth) {
 986                 for (i = 0; i < uspi->s_apb; i++) {
 987                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 988                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 989                         if (block)
 990                                 free_full_branch(inode, block, depth);
 991                 }
 992         } else {
 993                 struct to_free ctx = {.inode = inode};
 994
 995                 for (i = 0; i < uspi->s_apb; i++) {
 996                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 997                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 998                         if (block)
 999                                 free_data(&ctx, block, uspi->s_fpb);
1000                 }
1001                 free_data(&ctx, 0, 0);
1002         }
1003
1004         ubh_bforget(ubh);
1005         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1006 }
1007
1008 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1009 {
1010         struct super_block *sb = inode->i_sb;
1011         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1012         unsigned i;
1013
1014         if (--depth) {
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_full_branch(inode, block, depth);
1024                         }
1025                 }
1026         } else {
1027                 struct to_free ctx = {.inode = inode};
1028
1029                 for (i = from; i < uspi->s_apb; i++) {
1030                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1031                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1032                         if (block) {
1033                                 write_seqlock(&UFS_I(inode)->meta_lock);
1034                                 ufs_data_ptr_clear(uspi, p);
1035                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1036                                 ubh_mark_buffer_dirty(ubh);
1037                                 free_data(&ctx, block, uspi->s_fpb);
1038                         }
1039                 }
1040                 free_data(&ctx, 0, 0);
1041         }
1042         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1043                 ubh_sync_block(ubh);
1044         ubh_brelse(ubh);
1045 }
1046
1047 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1048 {
1049         int err = 0;
1050         struct super_block *sb = inode->i_sb;
1051         struct address_space *mapping = inode->i_mapping;
1052         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1053         unsigned i, end;
1054         sector_t lastfrag;
1055         struct page *lastpage;
1056         struct buffer_head *bh;
1057         u64 phys64;
1058
1059         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1060
1061         if (!lastfrag)
1062                 goto out;
1063
1064         lastfrag--;
1065
1066         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1067                                        (PAGE_SHIFT - inode->i_blkbits));
1068        if (IS_ERR(lastpage)) {
1069                err = -EIO;
1070                goto out;
1071        }
1072
1073        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1074        bh = page_buffers(lastpage);
1075        for (i = 0; i < end; ++i)
1076                bh = bh->b_this_page;
1077
1078
1079        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1080
1081        if (unlikely(err))
1082                goto out_unlock;
1083
1084        if (buffer_new(bh)) {
1085                clear_buffer_new(bh);
1086                clean_bdev_bh_alias(bh);
1087                /*
1088                 * we do not zeroize fragment, because of
1089                 * if it maped to hole, it already contains zeroes
1090                 */
1091                set_buffer_uptodate(bh);
1092                mark_buffer_dirty(bh);
1093                set_page_dirty(lastpage);
1094        }
1095
1096        if (lastfrag >= UFS_IND_FRAGMENT) {
1097                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1098                phys64 = bh->b_blocknr + 1;
1099                for (i = 0; i < end; ++i) {
1100                        bh = sb_getblk(sb, i + phys64);
1101                        lock_buffer(bh);
1102                        memset(bh->b_data, 0, sb->s_blocksize);
1103                        set_buffer_uptodate(bh);
1104                        mark_buffer_dirty(bh);
1105                        unlock_buffer(bh);
1106                        sync_dirty_buffer(bh);
1107                        brelse(bh);
1108                }
1109        }
1110 out_unlock:
1111        ufs_put_locked_page(lastpage);
1112 out:
1113        return err;
1114 }
1115
1116 static void ufs_truncate_blocks(struct inode *inode)
1117 {
1118         struct ufs_inode_info *ufsi = UFS_I(inode);
1119         struct super_block *sb = inode->i_sb;
1120         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1121         unsigned offsets[4];
1122         int depth;
1123         int depth2;
1124         unsigned i;
1125         struct ufs_buffer_head *ubh[3];
1126         void *p;
1127         u64 block;
1128
1129         if (inode->i_size) {
1130                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1131                 depth = ufs_block_to_path(inode, last, offsets);
1132                 if (!depth)
1133                         return;
1134         } else {
1135                 depth = 1;
1136         }
1137
1138         for (depth2 = depth - 1; depth2; depth2--)
1139                 if (offsets[depth2] != uspi->s_apb - 1)
1140                         break;
1141
1142         mutex_lock(&ufsi->truncate_mutex);
1143         if (depth == 1) {
1144                 ufs_trunc_direct(inode);
1145                 offsets[0] = UFS_IND_BLOCK;
1146         } else {
1147                 /* get the blocks that should be partially emptied */
1148                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1149                 for (i = 0; i < depth2; i++) {
1150                         block = ufs_data_ptr_to_cpu(sb, p);
1151                         if (!block)
1152                                 break;
1153                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1154                         if (!ubh[i]) {
1155                                 write_seqlock(&ufsi->meta_lock);
1156                                 ufs_data_ptr_clear(uspi, p);
1157                                 write_sequnlock(&ufsi->meta_lock);
1158                                 break;
1159                         }
1160                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1161                 }
1162                 while (i--)
1163                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1164         }
1165         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1166                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1167                 block = ufs_data_ptr_to_cpu(sb, p);
1168                 if (block) {
1169                         write_seqlock(&ufsi->meta_lock);
1170                         ufs_data_ptr_clear(uspi, p);
1171                         write_sequnlock(&ufsi->meta_lock);
1172                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1173                 }
1174         }
1175         read_seqlock_excl(&ufsi->meta_lock);
1176         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1177         read_sequnlock_excl(&ufsi->meta_lock);
1178         mark_inode_dirty(inode);
1179         mutex_unlock(&ufsi->truncate_mutex);
1180 }
1181
1182 static int ufs_truncate(struct inode *inode, loff_t size)
1183 {
1184         int err = 0;
1185
1186         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1187              inode->i_ino, (unsigned long long)size,
1188              (unsigned long long)i_size_read(inode));
1189
1190         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1191               S_ISLNK(inode->i_mode)))
1192                 return -EINVAL;
1193         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1194                 return -EPERM;
1195
1196         err = ufs_alloc_lastblock(inode, size);
1197
1198         if (err)
1199                 goto out;
1200
1201         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1202
1203         truncate_setsize(inode, size);
1204
1205         ufs_truncate_blocks(inode);
1206         inode->i_mtime = inode->i_ctime = current_time(inode);
1207         mark_inode_dirty(inode);
1208 out:
1209         UFSD("EXIT: err %d\n", err);
1210         return err;
1211 }
1212
1213 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1214 {
1215         struct inode *inode = d_inode(dentry);
1216         unsigned int ia_valid = attr->ia_valid;
1217         int error;
1218
1219         error = setattr_prepare(dentry, attr);
1220         if (error)
1221                 return error;
1222
1223         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1224                 error = ufs_truncate(inode, attr->ia_size);
1225                 if (error)
1226                         return error;
1227         }
1228
1229         setattr_copy(inode, attr);
1230         mark_inode_dirty(inode);
1231         return 0;
1232 }
1233
1234 const struct inode_operations ufs_file_inode_operations = {
1235         .setattr = ufs_setattr,
1236 };