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 #include <linux/iversion.h>
  40
  41 #include "ufs_fs.h"
  42 #include "ufs.h"
  43 #include "swab.h"
  44 #include "util.h"
  45
  46 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  47 {
  48         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  49         int ptrs = uspi->s_apb;
  50         int ptrs_bits = uspi->s_apbshift;
  51         const long direct_blocks = UFS_NDADDR,
  52                 indirect_blocks = ptrs,
  53                 double_blocks = (1 << (ptrs_bits * 2));
  54         int n = 0;
  55
  56
  57         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  58         if (i_block < direct_blocks) {
  59                 offsets[n++] = i_block;
  60         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  61                 offsets[n++] = UFS_IND_BLOCK;
  62                 offsets[n++] = i_block;
  63         } else if ((i_block -= indirect_blocks) < double_blocks) {
  64                 offsets[n++] = UFS_DIND_BLOCK;
  65                 offsets[n++] = i_block >> ptrs_bits;
  66                 offsets[n++] = i_block & (ptrs - 1);
  67         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  68                 offsets[n++] = UFS_TIND_BLOCK;
  69                 offsets[n++] = i_block >> (ptrs_bits * 2);
  70                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  71                 offsets[n++] = i_block & (ptrs - 1);
  72         } else {
  73                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  74         }
  75         return n;
  76 }
  77
  78 typedef struct {
  79         void    *p;
  80         union {
  81                 __fs32  key32;
  82                 __fs64  key64;
  83         };
  84         struct buffer_head *bh;
  85 } Indirect;
  86
  87 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  88                                struct buffer_head *bh, __fs32 *v,
  89                                Indirect *from, Indirect *to)
  90 {
  91         Indirect *p;
  92         unsigned seq;
  93         to->bh = bh;
  94         do {
  95                 seq = read_seqbegin(&ufsi->meta_lock);
  96                 to->key32 = *(__fs32 *)(to->p = v);
  97                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  98                         ;
  99         } while (read_seqretry(&ufsi->meta_lock, seq));
 100         return (p > to);
 101 }
 102
 103 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 104                                struct buffer_head *bh, __fs64 *v,
 105                                Indirect *from, Indirect *to)
 106 {
 107         Indirect *p;
 108         unsigned seq;
 109         to->bh = bh;
 110         do {
 111                 seq = read_seqbegin(&ufsi->meta_lock);
 112                 to->key64 = *(__fs64 *)(to->p = v);
 113                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 114                         ;
 115         } while (read_seqretry(&ufsi->meta_lock, seq));
 116         return (p > to);
 117 }
 118
 119 /*
 120  * Returns the location of the fragment from
 121  * the beginning of the filesystem.
 122  */
 123
 124 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 125 {
 126         struct ufs_inode_info *ufsi = UFS_I(inode);
 127         struct super_block *sb = inode->i_sb;
 128         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 129         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 130         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 131         Indirect chain[4], *q = chain;
 132         unsigned *p;
 133         unsigned flags = UFS_SB(sb)->s_flags;
 134         u64 res = 0;
 135
 136         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 137                 uspi->s_fpbshift, uspi->s_apbmask,
 138                 (unsigned long long)mask);
 139
 140         if (depth == 0)
 141                 goto no_block;
 142
 143 again:
 144         p = offsets;
 145
 146         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 147                 goto ufs2;
 148
 149         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 150                 goto changed;
 151         if (!q->key32)
 152                 goto no_block;
 153         while (--depth) {
 154                 __fs32 *ptr;
 155                 struct buffer_head *bh;
 156                 unsigned n = *p++;
 157
 158                 bh = sb_bread(sb, uspi->s_sbbase +
 159                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 160                 if (!bh)
 161                         goto no_block;
 162                 ptr = (__fs32 *)bh->b_data + (n & mask);
 163                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 164                         goto changed;
 165                 if (!q->key32)
 166                         goto no_block;
 167         }
 168         res = fs32_to_cpu(sb, q->key32);
 169         goto found;
 170
 171 ufs2:
 172         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 173                 goto changed;
 174         if (!q->key64)
 175                 goto no_block;
 176
 177         while (--depth) {
 178                 __fs64 *ptr;
 179                 struct buffer_head *bh;
 180                 unsigned n = *p++;
 181
 182                 bh = sb_bread(sb, uspi->s_sbbase +
 183                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 184                 if (!bh)
 185                         goto no_block;
 186                 ptr = (__fs64 *)bh->b_data + (n & mask);
 187                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 188                         goto changed;
 189                 if (!q->key64)
 190                         goto no_block;
 191         }
 192         res = fs64_to_cpu(sb, q->key64);
 193 found:
 194         res += uspi->s_sbbase;
 195 no_block:
 196         while (q > chain) {
 197                 brelse(q->bh);
 198                 q--;
 199         }
 200         return res;
 201
 202 changed:
 203         while (q > chain) {
 204                 brelse(q->bh);
 205                 q--;
 206         }
 207         goto again;
 208 }
 209
 210 /*
 211  * Unpacking tails: we have a file with partial final block and
 212  * we had been asked to extend it.  If the fragment being written
 213  * is within the same block, we need to extend the tail just to cover
 214  * that fragment.  Otherwise the tail is extended to full block.
 215  *
 216  * Note that we might need to create a _new_ tail, but that will
 217  * be handled elsewhere; this is strictly for resizing old
 218  * ones.
 219  */
 220 static bool
 221 ufs_extend_tail(struct inode *inode, u64 writes_to,
 222                   int *err, struct page *locked_page)
 223 {
 224         struct ufs_inode_info *ufsi = UFS_I(inode);
 225         struct super_block *sb = inode->i_sb;
 226         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 227         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 228         unsigned block = ufs_fragstoblks(lastfrag);
 229         unsigned new_size;
 230         void *p;
 231         u64 tmp;
 232
 233         if (writes_to < (lastfrag | uspi->s_fpbmask))
 234                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 235         else
 236                 new_size = uspi->s_fpb;
 237
 238         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 239         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 240                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 241                                 locked_page);
 242         return tmp != 0;
 243 }
 244
 245 /**
 246  * ufs_inode_getfrag() - allocate new fragment(s)
 247  * @inode: pointer to inode
 248  * @index: number of block pointer within the inode's array.
 249  * @new_fragment: number of new allocated fragment(s)
 250  * @err: we set it if something wrong
 251  * @new: we set it if we allocate new block
 252  * @locked_page: for ufs_new_fragments()
 253  */
 254 static u64
 255 ufs_inode_getfrag(struct inode *inode, unsigned index,
 256                   sector_t new_fragment, int *err,
 257                   int *new, struct page *locked_page)
 258 {
 259         struct ufs_inode_info *ufsi = UFS_I(inode);
 260         struct super_block *sb = inode->i_sb;
 261         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 262         u64 tmp, goal, lastfrag;
 263         unsigned nfrags = uspi->s_fpb;
 264         void *p;
 265
 266         /* TODO : to be done for write support
 267         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 268              goto ufs2;
 269          */
 270
 271         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 272         tmp = ufs_data_ptr_to_cpu(sb, p);
 273         if (tmp)
 274                 goto out;
 275
 276         lastfrag = ufsi->i_lastfrag;
 277
 278         /* will that be a new tail? */
 279         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 280                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 281
 282         goal = 0;
 283         if (index) {
 284                 goal = ufs_data_ptr_to_cpu(sb,
 285                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 286                 if (goal)
 287                         goal += uspi->s_fpb;
 288         }
 289         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 290                                 goal, nfrags, err, locked_page);
 291
 292         if (!tmp) {
 293                 *err = -ENOSPC;
 294                 return 0;
 295         }
 296
 297         if (new)
 298                 *new = 1;
 299         inode->i_ctime = current_time(inode);
 300         if (IS_SYNC(inode))
 301                 ufs_sync_inode (inode);
 302         mark_inode_dirty(inode);
 303 out:
 304         return tmp + uspi->s_sbbase;
 305
 306      /* This part : To be implemented ....
 307         Required only for writing, not required for READ-ONLY.
 308 ufs2:
 309
 310         u2_block = ufs_fragstoblks(fragment);
 311         u2_blockoff = ufs_fragnum(fragment);
 312         p = ufsi->i_u1.u2_i_data + block;
 313         goal = 0;
 314
 315 repeat2:
 316         tmp = fs32_to_cpu(sb, *p);
 317         lastfrag = ufsi->i_lastfrag;
 318
 319      */
 320 }
 321
 322 /**
 323  * ufs_inode_getblock() - allocate new block
 324  * @inode: pointer to inode
 325  * @ind_block: block number of the indirect block
 326  * @index: number of pointer within the indirect block
 327  * @new_fragment: number of new allocated fragment
 328  *  (block will hold this fragment and also uspi->s_fpb-1)
 329  * @err: see ufs_inode_getfrag()
 330  * @new: see ufs_inode_getfrag()
 331  * @locked_page: see ufs_inode_getfrag()
 332  */
 333 static u64
 334 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 335                   unsigned index, sector_t new_fragment, int *err,
 336                   int *new, struct page *locked_page)
 337 {
 338         struct super_block *sb = inode->i_sb;
 339         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 340         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 341         u64 tmp = 0, goal;
 342         struct buffer_head *bh;
 343         void *p;
 344
 345         if (!ind_block)
 346                 return 0;
 347
 348         bh = sb_bread(sb, ind_block + (index >> shift));
 349         if (unlikely(!bh)) {
 350                 *err = -EIO;
 351                 return 0;
 352         }
 353
 354         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 355         if (uspi->fs_magic == UFS2_MAGIC)
 356                 p = (__fs64 *)bh->b_data + index;
 357         else
 358                 p = (__fs32 *)bh->b_data + index;
 359
 360         tmp = ufs_data_ptr_to_cpu(sb, p);
 361         if (tmp)
 362                 goto out;
 363
 364         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 365                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 366                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 367                 goal = tmp + uspi->s_fpb;
 368         else
 369                 goal = bh->b_blocknr + uspi->s_fpb;
 370         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 371                                 uspi->s_fpb, err, locked_page);
 372         if (!tmp)
 373                 goto out;
 374
 375         if (new)
 376                 *new = 1;
 377
 378         mark_buffer_dirty(bh);
 379         if (IS_SYNC(inode))
 380                 sync_dirty_buffer(bh);
 381         inode->i_ctime = current_time(inode);
 382         mark_inode_dirty(inode);
 383 out:
 384         brelse (bh);
 385         UFSD("EXIT\n");
 386         if (tmp)
 387                 tmp += uspi->s_sbbase;
 388         return tmp;
 389 }
 390
 391 /**
 392  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 393  * read_folio, writepage and so on
 394  */
 395
 396 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 397 {
 398         struct super_block *sb = inode->i_sb;
 399         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 400         int err = 0, new = 0;
 401         unsigned offsets[4];
 402         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 403         u64 phys64 = 0;
 404         unsigned frag = fragment & uspi->s_fpbmask;
 405
 406         phys64 = ufs_frag_map(inode, offsets, depth);
 407         if (!create)
 408                 goto done;
 409
 410         if (phys64) {
 411                 if (fragment >= UFS_NDIR_FRAGMENT)
 412                         goto done;
 413                 read_seqlock_excl(&UFS_I(inode)->meta_lock);
 414                 if (fragment < UFS_I(inode)->i_lastfrag) {
 415                         read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 416                         goto done;
 417                 }
 418                 read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 419         }
 420         /* This code entered only while writing ....? */
 421
 422         mutex_lock(&UFS_I(inode)->truncate_mutex);
 423
 424         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 425         if (unlikely(!depth)) {
 426                 ufs_warning(sb, "ufs_get_block", "block > big");
 427                 err = -EIO;
 428                 goto out;
 429         }
 430
 431         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 432                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 433                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 434                 if (tailfrags && fragment >= lastfrag) {
 435                         if (!ufs_extend_tail(inode, fragment,
 436                                              &err, bh_result->b_page))
 437                                 goto out;
 438                 }
 439         }
 440
 441         if (depth == 1) {
 442                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 443                                            &err, &new, bh_result->b_page);
 444         } else {
 445                 int i;
 446                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 447                                            &err, NULL, NULL);
 448                 for (i = 1; i < depth - 1; i++)
 449                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 450                                                 fragment, &err, NULL, NULL);
 451                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 452                                         fragment, &err, &new, bh_result->b_page);
 453         }
 454 out:
 455         if (phys64) {
 456                 phys64 += frag;
 457                 map_bh(bh_result, sb, phys64);
 458                 if (new)
 459                         set_buffer_new(bh_result);
 460         }
 461         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 462         return err;
 463
 464 done:
 465         if (phys64)
 466                 map_bh(bh_result, sb, phys64 + frag);
 467         return 0;
 468 }
 469
 470 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 471 {
 472         return block_write_full_page(page,ufs_getfrag_block,wbc);
 473 }
 474
 475 static int ufs_read_folio(struct file *file, struct folio *folio)
 476 {
 477         return block_read_full_folio(folio, ufs_getfrag_block);
 478 }
 479
 480 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 481 {
 482         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 483 }
 484
 485 static void ufs_truncate_blocks(struct inode *);
 486
 487 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 488 {
 489         struct inode *inode = mapping->host;
 490
 491         if (to > inode->i_size) {
 492                 truncate_pagecache(inode, inode->i_size);
 493                 ufs_truncate_blocks(inode);
 494         }
 495 }
 496
 497 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 498                         loff_t pos, unsigned len,
 499                         struct page **pagep, void **fsdata)
 500 {
 501         int ret;
 502
 503         ret = block_write_begin(mapping, pos, len, pagep, 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         .dirty_folio = block_dirty_folio,
 529         .invalidate_folio = block_invalidate_folio,
 530         .read_folio = ufs_read_folio,
 531         .writepage = ufs_writepage,
 532         .write_begin = ufs_write_begin,
 533         .write_end = ufs_write_end,
 534         .bmap = ufs_bmap
 535 };
 536
 537 static void ufs_set_inode_ops(struct inode *inode)
 538 {
 539         if (S_ISREG(inode->i_mode)) {
 540                 inode->i_op = &ufs_file_inode_operations;
 541                 inode->i_fop = &ufs_file_operations;
 542                 inode->i_mapping->a_ops = &ufs_aops;
 543         } else if (S_ISDIR(inode->i_mode)) {
 544                 inode->i_op = &ufs_dir_inode_operations;
 545                 inode->i_fop = &ufs_dir_operations;
 546                 inode->i_mapping->a_ops = &ufs_aops;
 547         } else if (S_ISLNK(inode->i_mode)) {
 548                 if (!inode->i_blocks) {
 549                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 550                         inode->i_op = &simple_symlink_inode_operations;
 551                 } else {
 552                         inode->i_mapping->a_ops = &ufs_aops;
 553                         inode->i_op = &page_symlink_inode_operations;
 554                         inode_nohighmem(inode);
 555                 }
 556         } else
 557                 init_special_inode(inode, inode->i_mode,
 558                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 559 }
 560
 561 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 562 {
 563         struct ufs_inode_info *ufsi = UFS_I(inode);
 564         struct super_block *sb = inode->i_sb;
 565         umode_t mode;
 566
 567         /*
 568          * Copy data to the in-core inode.
 569          */
 570         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 571         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 572         if (inode->i_nlink == 0)
 573                 return -ESTALE;
 574
 575         /*
 576          * Linux now has 32-bit uid and gid, so we can support EFT.
 577          */
 578         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 579         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 580
 581         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 582         inode->i_atime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 583         inode->i_ctime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 584         inode->i_mtime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 585         inode->i_mtime.tv_nsec = 0;
 586         inode->i_atime.tv_nsec = 0;
 587         inode->i_ctime.tv_nsec = 0;
 588         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 589         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 590         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 591         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 592         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 593
 594
 595         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 596                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 597                        sizeof(ufs_inode->ui_u2.ui_addr));
 598         } else {
 599                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 600                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 601                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 602         }
 603         return 0;
 604 }
 605
 606 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 607 {
 608         struct ufs_inode_info *ufsi = UFS_I(inode);
 609         struct super_block *sb = inode->i_sb;
 610         umode_t mode;
 611
 612         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 613         /*
 614          * Copy data to the in-core inode.
 615          */
 616         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 617         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 618         if (inode->i_nlink == 0)
 619                 return -ESTALE;
 620
 621         /*
 622          * Linux now has 32-bit uid and gid, so we can support EFT.
 623          */
 624         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 625         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 626
 627         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 628         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 629         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 630         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 631         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 632         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 633         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 634         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 635         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 636         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 637         /*
 638         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 639         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 640         */
 641
 642         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 643                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 644                        sizeof(ufs2_inode->ui_u2.ui_addr));
 645         } else {
 646                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 647                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 648                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 649         }
 650         return 0;
 651 }
 652
 653 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 654 {
 655         struct ufs_inode_info *ufsi;
 656         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 657         struct buffer_head * bh;
 658         struct inode *inode;
 659         int err = -EIO;
 660
 661         UFSD("ENTER, ino %lu\n", ino);
 662
 663         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 664                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 665                             ino);
 666                 return ERR_PTR(-EIO);
 667         }
 668
 669         inode = iget_locked(sb, ino);
 670         if (!inode)
 671                 return ERR_PTR(-ENOMEM);
 672         if (!(inode->i_state & I_NEW))
 673                 return inode;
 674
 675         ufsi = UFS_I(inode);
 676
 677         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 678         if (!bh) {
 679                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 680                             inode->i_ino);
 681                 goto bad_inode;
 682         }
 683         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 684                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 685
 686                 err = ufs2_read_inode(inode,
 687                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 688         } else {
 689                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 690
 691                 err = ufs1_read_inode(inode,
 692                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 693         }
 694         brelse(bh);
 695         if (err)
 696                 goto bad_inode;
 697
 698         inode_inc_iversion(inode);
 699         ufsi->i_lastfrag =
 700                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 701         ufsi->i_dir_start_lookup = 0;
 702         ufsi->i_osync = 0;
 703
 704         ufs_set_inode_ops(inode);
 705
 706         UFSD("EXIT\n");
 707         unlock_new_inode(inode);
 708         return inode;
 709
 710 bad_inode:
 711         iget_failed(inode);
 712         return ERR_PTR(err);
 713 }
 714
 715 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 716 {
 717         struct super_block *sb = inode->i_sb;
 718         struct ufs_inode_info *ufsi = UFS_I(inode);
 719
 720         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 721         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 722
 723         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 724         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 725
 726         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 727         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 728         ufs_inode->ui_atime.tv_usec = 0;
 729         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 730         ufs_inode->ui_ctime.tv_usec = 0;
 731         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 732         ufs_inode->ui_mtime.tv_usec = 0;
 733         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 734         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 735         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 736
 737         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 738                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 739                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 740         }
 741
 742         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 743                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 744                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 745         } else if (inode->i_blocks) {
 746                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 747                        sizeof(ufs_inode->ui_u2.ui_addr));
 748         }
 749         else {
 750                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 751                        sizeof(ufs_inode->ui_u2.ui_symlink));
 752         }
 753
 754         if (!inode->i_nlink)
 755                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 756 }
 757
 758 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 759 {
 760         struct super_block *sb = inode->i_sb;
 761         struct ufs_inode_info *ufsi = UFS_I(inode);
 762
 763         UFSD("ENTER\n");
 764         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 765         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 766
 767         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 768         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 769
 770         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 771         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 772         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 773         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 774         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 775         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 776         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 777
 778         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 779         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 780         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 781
 782         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 783                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 784                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 785         } else if (inode->i_blocks) {
 786                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 787                        sizeof(ufs_inode->ui_u2.ui_addr));
 788         } else {
 789                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 790                        sizeof(ufs_inode->ui_u2.ui_symlink));
 791         }
 792
 793         if (!inode->i_nlink)
 794                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 795         UFSD("EXIT\n");
 796 }
 797
 798 static int ufs_update_inode(struct inode * inode, int do_sync)
 799 {
 800         struct super_block *sb = inode->i_sb;
 801         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 802         struct buffer_head * bh;
 803
 804         UFSD("ENTER, ino %lu\n", inode->i_ino);
 805
 806         if (inode->i_ino < UFS_ROOTINO ||
 807             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 808                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 809                 return -1;
 810         }
 811
 812         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 813         if (!bh) {
 814                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 815                 return -1;
 816         }
 817         if (uspi->fs_magic == UFS2_MAGIC) {
 818                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 819
 820                 ufs2_update_inode(inode,
 821                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 822         } else {
 823                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 824
 825                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 826         }
 827
 828         mark_buffer_dirty(bh);
 829         if (do_sync)
 830                 sync_dirty_buffer(bh);
 831         brelse (bh);
 832
 833         UFSD("EXIT\n");
 834         return 0;
 835 }
 836
 837 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 838 {
 839         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 840 }
 841
 842 int ufs_sync_inode (struct inode *inode)
 843 {
 844         return ufs_update_inode (inode, 1);
 845 }
 846
 847 void ufs_evict_inode(struct inode * inode)
 848 {
 849         int want_delete = 0;
 850
 851         if (!inode->i_nlink && !is_bad_inode(inode))
 852                 want_delete = 1;
 853
 854         truncate_inode_pages_final(&inode->i_data);
 855         if (want_delete) {
 856                 inode->i_size = 0;
 857                 if (inode->i_blocks &&
 858                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 859                      S_ISLNK(inode->i_mode)))
 860                         ufs_truncate_blocks(inode);
 861                 ufs_update_inode(inode, inode_needs_sync(inode));
 862         }
 863
 864         invalidate_inode_buffers(inode);
 865         clear_inode(inode);
 866
 867         if (want_delete)
 868                 ufs_free_inode(inode);
 869 }
 870
 871 struct to_free {
 872         struct inode *inode;
 873         u64 to;
 874         unsigned count;
 875 };
 876
 877 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 878 {
 879         if (ctx->count && ctx->to != from) {
 880                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 881                 ctx->count = 0;
 882         }
 883         ctx->count += count;
 884         ctx->to = from + count;
 885 }
 886
 887 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 888
 889 static void ufs_trunc_direct(struct inode *inode)
 890 {
 891         struct ufs_inode_info *ufsi = UFS_I(inode);
 892         struct super_block * sb;
 893         struct ufs_sb_private_info * uspi;
 894         void *p;
 895         u64 frag1, frag2, frag3, frag4, block1, block2;
 896         struct to_free ctx = {.inode = inode};
 897         unsigned i, tmp;
 898
 899         UFSD("ENTER: ino %lu\n", inode->i_ino);
 900
 901         sb = inode->i_sb;
 902         uspi = UFS_SB(sb)->s_uspi;
 903
 904         frag1 = DIRECT_FRAGMENT;
 905         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 906         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 907         frag3 = frag4 & ~uspi->s_fpbmask;
 908         block1 = block2 = 0;
 909         if (frag2 > frag3) {
 910                 frag2 = frag4;
 911                 frag3 = frag4 = 0;
 912         } else if (frag2 < frag3) {
 913                 block1 = ufs_fragstoblks (frag2);
 914                 block2 = ufs_fragstoblks (frag3);
 915         }
 916
 917         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 918              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 919              (unsigned long long)frag1, (unsigned long long)frag2,
 920              (unsigned long long)block1, (unsigned long long)block2,
 921              (unsigned long long)frag3, (unsigned long long)frag4);
 922
 923         if (frag1 >= frag2)
 924                 goto next1;
 925
 926         /*
 927          * Free first free fragments
 928          */
 929         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 930         tmp = ufs_data_ptr_to_cpu(sb, p);
 931         if (!tmp )
 932                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 933         frag2 -= frag1;
 934         frag1 = ufs_fragnum (frag1);
 935
 936         ufs_free_fragments(inode, tmp + frag1, frag2);
 937
 938 next1:
 939         /*
 940          * Free whole blocks
 941          */
 942         for (i = block1 ; i < block2; i++) {
 943                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 944                 tmp = ufs_data_ptr_to_cpu(sb, p);
 945                 if (!tmp)
 946                         continue;
 947                 write_seqlock(&ufsi->meta_lock);
 948                 ufs_data_ptr_clear(uspi, p);
 949                 write_sequnlock(&ufsi->meta_lock);
 950
 951                 free_data(&ctx, tmp, uspi->s_fpb);
 952         }
 953
 954         free_data(&ctx, 0, 0);
 955
 956         if (frag3 >= frag4)
 957                 goto next3;
 958
 959         /*
 960          * Free last free fragments
 961          */
 962         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 963         tmp = ufs_data_ptr_to_cpu(sb, p);
 964         if (!tmp )
 965                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 966         frag4 = ufs_fragnum (frag4);
 967         write_seqlock(&ufsi->meta_lock);
 968         ufs_data_ptr_clear(uspi, p);
 969         write_sequnlock(&ufsi->meta_lock);
 970
 971         ufs_free_fragments (inode, tmp, frag4);
 972  next3:
 973
 974         UFSD("EXIT: ino %lu\n", inode->i_ino);
 975 }
 976
 977 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 978 {
 979         struct super_block *sb = inode->i_sb;
 980         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 981         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 982         unsigned i;
 983
 984         if (!ubh)
 985                 return;
 986
 987         if (--depth) {
 988                 for (i = 0; i < uspi->s_apb; i++) {
 989                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 990                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 991                         if (block)
 992                                 free_full_branch(inode, block, depth);
 993                 }
 994         } else {
 995                 struct to_free ctx = {.inode = inode};
 996
 997                 for (i = 0; i < uspi->s_apb; i++) {
 998                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 999                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1000                         if (block)
1001                                 free_data(&ctx, block, uspi->s_fpb);
1002                 }
1003                 free_data(&ctx, 0, 0);
1004         }
1005
1006         ubh_bforget(ubh);
1007         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1008 }
1009
1010 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1011 {
1012         struct super_block *sb = inode->i_sb;
1013         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1014         unsigned i;
1015
1016         if (--depth) {
1017                 for (i = from; i < uspi->s_apb ; i++) {
1018                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1019                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1020                         if (block) {
1021                                 write_seqlock(&UFS_I(inode)->meta_lock);
1022                                 ufs_data_ptr_clear(uspi, p);
1023                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1024                                 ubh_mark_buffer_dirty(ubh);
1025                                 free_full_branch(inode, block, depth);
1026                         }
1027                 }
1028         } else {
1029                 struct to_free ctx = {.inode = inode};
1030
1031                 for (i = from; i < uspi->s_apb; i++) {
1032                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1033                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1034                         if (block) {
1035                                 write_seqlock(&UFS_I(inode)->meta_lock);
1036                                 ufs_data_ptr_clear(uspi, p);
1037                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1038                                 ubh_mark_buffer_dirty(ubh);
1039                                 free_data(&ctx, block, uspi->s_fpb);
1040                         }
1041                 }
1042                 free_data(&ctx, 0, 0);
1043         }
1044         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1045                 ubh_sync_block(ubh);
1046         ubh_brelse(ubh);
1047 }
1048
1049 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1050 {
1051         int err = 0;
1052         struct super_block *sb = inode->i_sb;
1053         struct address_space *mapping = inode->i_mapping;
1054         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1055         unsigned i, end;
1056         sector_t lastfrag;
1057         struct page *lastpage;
1058         struct buffer_head *bh;
1059         u64 phys64;
1060
1061         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1062
1063         if (!lastfrag)
1064                 goto out;
1065
1066         lastfrag--;
1067
1068         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1069                                        (PAGE_SHIFT - inode->i_blkbits));
1070        if (IS_ERR(lastpage)) {
1071                err = -EIO;
1072                goto out;
1073        }
1074
1075        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1076        bh = page_buffers(lastpage);
1077        for (i = 0; i < end; ++i)
1078                bh = bh->b_this_page;
1079
1080
1081        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1082
1083        if (unlikely(err))
1084                goto out_unlock;
1085
1086        if (buffer_new(bh)) {
1087                clear_buffer_new(bh);
1088                clean_bdev_bh_alias(bh);
1089                /*
1090                 * we do not zeroize fragment, because of
1091                 * if it maped to hole, it already contains zeroes
1092                 */
1093                set_buffer_uptodate(bh);
1094                mark_buffer_dirty(bh);
1095                set_page_dirty(lastpage);
1096        }
1097
1098        if (lastfrag >= UFS_IND_FRAGMENT) {
1099                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1100                phys64 = bh->b_blocknr + 1;
1101                for (i = 0; i < end; ++i) {
1102                        bh = sb_getblk(sb, i + phys64);
1103                        lock_buffer(bh);
1104                        memset(bh->b_data, 0, sb->s_blocksize);
1105                        set_buffer_uptodate(bh);
1106                        mark_buffer_dirty(bh);
1107                        unlock_buffer(bh);
1108                        sync_dirty_buffer(bh);
1109                        brelse(bh);
1110                }
1111        }
1112 out_unlock:
1113        ufs_put_locked_page(lastpage);
1114 out:
1115        return err;
1116 }
1117
1118 static void ufs_truncate_blocks(struct inode *inode)
1119 {
1120         struct ufs_inode_info *ufsi = UFS_I(inode);
1121         struct super_block *sb = inode->i_sb;
1122         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1123         unsigned offsets[4];
1124         int depth;
1125         int depth2;
1126         unsigned i;
1127         struct ufs_buffer_head *ubh[3];
1128         void *p;
1129         u64 block;
1130
1131         if (inode->i_size) {
1132                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1133                 depth = ufs_block_to_path(inode, last, offsets);
1134                 if (!depth)
1135                         return;
1136         } else {
1137                 depth = 1;
1138         }
1139
1140         for (depth2 = depth - 1; depth2; depth2--)
1141                 if (offsets[depth2] != uspi->s_apb - 1)
1142                         break;
1143
1144         mutex_lock(&ufsi->truncate_mutex);
1145         if (depth == 1) {
1146                 ufs_trunc_direct(inode);
1147                 offsets[0] = UFS_IND_BLOCK;
1148         } else {
1149                 /* get the blocks that should be partially emptied */
1150                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1151                 for (i = 0; i < depth2; i++) {
1152                         block = ufs_data_ptr_to_cpu(sb, p);
1153                         if (!block)
1154                                 break;
1155                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1156                         if (!ubh[i]) {
1157                                 write_seqlock(&ufsi->meta_lock);
1158                                 ufs_data_ptr_clear(uspi, p);
1159                                 write_sequnlock(&ufsi->meta_lock);
1160                                 break;
1161                         }
1162                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1163                 }
1164                 while (i--)
1165                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1166         }
1167         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1168                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1169                 block = ufs_data_ptr_to_cpu(sb, p);
1170                 if (block) {
1171                         write_seqlock(&ufsi->meta_lock);
1172                         ufs_data_ptr_clear(uspi, p);
1173                         write_sequnlock(&ufsi->meta_lock);
1174                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1175                 }
1176         }
1177         read_seqlock_excl(&ufsi->meta_lock);
1178         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1179         read_sequnlock_excl(&ufsi->meta_lock);
1180         mark_inode_dirty(inode);
1181         mutex_unlock(&ufsi->truncate_mutex);
1182 }
1183
1184 static int ufs_truncate(struct inode *inode, loff_t size)
1185 {
1186         int err = 0;
1187
1188         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1189              inode->i_ino, (unsigned long long)size,
1190              (unsigned long long)i_size_read(inode));
1191
1192         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1193               S_ISLNK(inode->i_mode)))
1194                 return -EINVAL;
1195         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1196                 return -EPERM;
1197
1198         err = ufs_alloc_lastblock(inode, size);
1199
1200         if (err)
1201                 goto out;
1202
1203         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1204
1205         truncate_setsize(inode, size);
1206
1207         ufs_truncate_blocks(inode);
1208         inode->i_mtime = inode->i_ctime = current_time(inode);
1209         mark_inode_dirty(inode);
1210 out:
1211         UFSD("EXIT: err %d\n", err);
1212         return err;
1213 }
1214
1215 int ufs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
1216                 struct iattr *attr)
1217 {
1218         struct inode *inode = d_inode(dentry);
1219         unsigned int ia_valid = attr->ia_valid;
1220         int error;
1221
1222         error = setattr_prepare(&init_user_ns, dentry, attr);
1223         if (error)
1224                 return error;
1225
1226         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1227                 error = ufs_truncate(inode, attr->ia_size);
1228                 if (error)
1229                         return error;
1230         }
1231
1232         setattr_copy(&init_user_ns, inode, attr);
1233         mark_inode_dirty(inode);
1234         return 0;
1235 }
1236
1237 const struct inode_operations ufs_file_inode_operations = {
1238         .setattr = ufs_setattr,
1239 };