fs/ufs/inode.c

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This source file includes following definitions.
ufs_block_to_path
grow_chain32
grow_chain64
ufs_frag_map
ufs_extend_tail
ufs_inode_getfrag
ufs_inode_getblock
ufs_getfrag_block
ufs_writepage
ufs_readpage
ufs_prepare_chunk
ufs_write_failed
ufs_write_begin
ufs_write_end
ufs_bmap
ufs_set_inode_ops
ufs1_read_inode
ufs2_read_inode
ufs_iget
ufs1_update_inode
ufs2_update_inode
ufs_update_inode
ufs_write_inode
ufs_sync_inode
ufs_evict_inode
free_data
ufs_trunc_direct
free_full_branch
free_branch_tail
ufs_alloc_lastblock
ufs_truncate_blocks
ufs_truncate
ufs_setattr
   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  * readpage, 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_readpage(struct file *file, struct page *page)
 476 {
 477         return block_read_full_page(page,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, unsigned flags,
 499                         struct page **pagep, void **fsdata)
 500 {
 501         int ret;
 502 
 503         ret = block_write_begin(mapping, pos, len, flags, pagep,
 504                                 ufs_getfrag_block);
 505         if (unlikely(ret))
 506                 ufs_write_failed(mapping, pos + len);
 507 
 508         return ret;
 509 }
 510 
 511 static int ufs_write_end(struct file *file, struct address_space *mapping,
 512                         loff_t pos, unsigned len, unsigned copied,
 513                         struct page *page, void *fsdata)
 514 {
 515         int ret;
 516 
 517         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 518         if (ret < len)
 519                 ufs_write_failed(mapping, pos + len);
 520         return ret;
 521 }
 522 
 523 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 524 {
 525         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 526 }
 527 
 528 const struct address_space_operations ufs_aops = {
 529         .readpage = ufs_readpage,
 530         .writepage = ufs_writepage,
 531         .write_begin = ufs_write_begin,
 532         .write_end = ufs_write_end,
 533         .bmap = ufs_bmap
 534 };
 535 
 536 static void ufs_set_inode_ops(struct inode *inode)
 537 {
 538         if (S_ISREG(inode->i_mode)) {
 539                 inode->i_op = &ufs_file_inode_operations;
 540                 inode->i_fop = &ufs_file_operations;
 541                 inode->i_mapping->a_ops = &ufs_aops;
 542         } else if (S_ISDIR(inode->i_mode)) {
 543                 inode->i_op = &ufs_dir_inode_operations;
 544                 inode->i_fop = &ufs_dir_operations;
 545                 inode->i_mapping->a_ops = &ufs_aops;
 546         } else if (S_ISLNK(inode->i_mode)) {
 547                 if (!inode->i_blocks) {
 548                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 549                         inode->i_op = &simple_symlink_inode_operations;
 550                 } else {
 551                         inode->i_mapping->a_ops = &ufs_aops;
 552                         inode->i_op = &page_symlink_inode_operations;
 553                         inode_nohighmem(inode);
 554                 }
 555         } else
 556                 init_special_inode(inode, inode->i_mode,
 557                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 558 }
 559 
 560 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 561 {
 562         struct ufs_inode_info *ufsi = UFS_I(inode);
 563         struct super_block *sb = inode->i_sb;
 564         umode_t mode;
 565 
 566         /*
 567          * Copy data to the in-core inode.
 568          */
 569         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 570         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 571         if (inode->i_nlink == 0)
 572                 return -ESTALE;
 573 
 574         /*
 575          * Linux now has 32-bit uid and gid, so we can support EFT.
 576          */
 577         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 578         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 579 
 580         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 581         inode->i_atime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 582         inode->i_ctime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 583         inode->i_mtime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 584         inode->i_mtime.tv_nsec = 0;
 585         inode->i_atime.tv_nsec = 0;
 586         inode->i_ctime.tv_nsec = 0;
 587         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 588         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 589         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 590         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 591         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 592 
 593 
 594         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 595                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 596                        sizeof(ufs_inode->ui_u2.ui_addr));
 597         } else {
 598                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 599                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 600                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 601         }
 602         return 0;
 603 }
 604 
 605 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 606 {
 607         struct ufs_inode_info *ufsi = UFS_I(inode);
 608         struct super_block *sb = inode->i_sb;
 609         umode_t mode;
 610 
 611         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 612         /*
 613          * Copy data to the in-core inode.
 614          */
 615         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 616         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 617         if (inode->i_nlink == 0)
 618                 return -ESTALE;
 619 
 620         /*
 621          * Linux now has 32-bit uid and gid, so we can support EFT.
 622          */
 623         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 624         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 625 
 626         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 627         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 628         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 629         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 630         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 631         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 632         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 633         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 634         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 635         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 636         /*
 637         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 638         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 639         */
 640 
 641         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 642                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 643                        sizeof(ufs2_inode->ui_u2.ui_addr));
 644         } else {
 645                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 646                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 647                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 648         }
 649         return 0;
 650 }
 651 
 652 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 653 {
 654         struct ufs_inode_info *ufsi;
 655         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 656         struct buffer_head * bh;
 657         struct inode *inode;
 658         int err = -EIO;
 659 
 660         UFSD("ENTER, ino %lu\n", ino);
 661 
 662         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 663                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 664                             ino);
 665                 return ERR_PTR(-EIO);
 666         }
 667 
 668         inode = iget_locked(sb, ino);
 669         if (!inode)
 670                 return ERR_PTR(-ENOMEM);
 671         if (!(inode->i_state & I_NEW))
 672                 return inode;
 673 
 674         ufsi = UFS_I(inode);
 675 
 676         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 677         if (!bh) {
 678                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 679                             inode->i_ino);
 680                 goto bad_inode;
 681         }
 682         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 683                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 684 
 685                 err = ufs2_read_inode(inode,
 686                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 687         } else {
 688                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 689 
 690                 err = ufs1_read_inode(inode,
 691                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 692         }
 693         brelse(bh);
 694         if (err)
 695                 goto bad_inode;
 696 
 697         inode_inc_iversion(inode);
 698         ufsi->i_lastfrag =
 699                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 700         ufsi->i_dir_start_lookup = 0;
 701         ufsi->i_osync = 0;
 702 
 703         ufs_set_inode_ops(inode);
 704 
 705         UFSD("EXIT\n");
 706         unlock_new_inode(inode);
 707         return inode;
 708 
 709 bad_inode:
 710         iget_failed(inode);
 711         return ERR_PTR(err);
 712 }
 713 
 714 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 715 {
 716         struct super_block *sb = inode->i_sb;
 717         struct ufs_inode_info *ufsi = UFS_I(inode);
 718 
 719         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 720         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 721 
 722         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 723         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 724 
 725         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 726         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 727         ufs_inode->ui_atime.tv_usec = 0;
 728         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 729         ufs_inode->ui_ctime.tv_usec = 0;
 730         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 731         ufs_inode->ui_mtime.tv_usec = 0;
 732         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 733         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 734         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 735 
 736         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 737                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 738                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 739         }
 740 
 741         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 742                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 743                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 744         } else if (inode->i_blocks) {
 745                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 746                        sizeof(ufs_inode->ui_u2.ui_addr));
 747         }
 748         else {
 749                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 750                        sizeof(ufs_inode->ui_u2.ui_symlink));
 751         }
 752 
 753         if (!inode->i_nlink)
 754                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 755 }
 756 
 757 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 758 {
 759         struct super_block *sb = inode->i_sb;
 760         struct ufs_inode_info *ufsi = UFS_I(inode);
 761 
 762         UFSD("ENTER\n");
 763         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 764         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 765 
 766         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 767         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 768 
 769         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 770         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 771         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 772         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 773         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 774         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 775         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 776 
 777         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 778         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 779         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 780 
 781         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 782                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 783                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 784         } else if (inode->i_blocks) {
 785                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 786                        sizeof(ufs_inode->ui_u2.ui_addr));
 787         } else {
 788                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 789                        sizeof(ufs_inode->ui_u2.ui_symlink));
 790         }
 791 
 792         if (!inode->i_nlink)
 793                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 794         UFSD("EXIT\n");
 795 }
 796 
 797 static int ufs_update_inode(struct inode * inode, int do_sync)
 798 {
 799         struct super_block *sb = inode->i_sb;
 800         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 801         struct buffer_head * bh;
 802 
 803         UFSD("ENTER, ino %lu\n", inode->i_ino);
 804 
 805         if (inode->i_ino < UFS_ROOTINO ||
 806             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 807                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 808                 return -1;
 809         }
 810 
 811         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 812         if (!bh) {
 813                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 814                 return -1;
 815         }
 816         if (uspi->fs_magic == UFS2_MAGIC) {
 817                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 818 
 819                 ufs2_update_inode(inode,
 820                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 821         } else {
 822                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 823 
 824                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 825         }
 826 
 827         mark_buffer_dirty(bh);
 828         if (do_sync)
 829                 sync_dirty_buffer(bh);
 830         brelse (bh);
 831 
 832         UFSD("EXIT\n");
 833         return 0;
 834 }
 835 
 836 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 837 {
 838         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 839 }
 840 
 841 int ufs_sync_inode (struct inode *inode)
 842 {
 843         return ufs_update_inode (inode, 1);
 844 }
 845 
 846 void ufs_evict_inode(struct inode * inode)
 847 {
 848         int want_delete = 0;
 849 
 850         if (!inode->i_nlink && !is_bad_inode(inode))
 851                 want_delete = 1;
 852 
 853         truncate_inode_pages_final(&inode->i_data);
 854         if (want_delete) {
 855                 inode->i_size = 0;
 856                 if (inode->i_blocks &&
 857                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 858                      S_ISLNK(inode->i_mode)))
 859                         ufs_truncate_blocks(inode);
 860                 ufs_update_inode(inode, inode_needs_sync(inode));
 861         }
 862 
 863         invalidate_inode_buffers(inode);
 864         clear_inode(inode);
 865 
 866         if (want_delete)
 867                 ufs_free_inode(inode);
 868 }
 869 
 870 struct to_free {
 871         struct inode *inode;
 872         u64 to;
 873         unsigned count;
 874 };
 875 
 876 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 877 {
 878         if (ctx->count && ctx->to != from) {
 879                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 880                 ctx->count = 0;
 881         }
 882         ctx->count += count;
 883         ctx->to = from + count;
 884 }
 885 
 886 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 887 
 888 static void ufs_trunc_direct(struct inode *inode)
 889 {
 890         struct ufs_inode_info *ufsi = UFS_I(inode);
 891         struct super_block * sb;
 892         struct ufs_sb_private_info * uspi;
 893         void *p;
 894         u64 frag1, frag2, frag3, frag4, block1, block2;
 895         struct to_free ctx = {.inode = inode};
 896         unsigned i, tmp;
 897 
 898         UFSD("ENTER: ino %lu\n", inode->i_ino);
 899 
 900         sb = inode->i_sb;
 901         uspi = UFS_SB(sb)->s_uspi;
 902 
 903         frag1 = DIRECT_FRAGMENT;
 904         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 905         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 906         frag3 = frag4 & ~uspi->s_fpbmask;
 907         block1 = block2 = 0;
 908         if (frag2 > frag3) {
 909                 frag2 = frag4;
 910                 frag3 = frag4 = 0;
 911         } else if (frag2 < frag3) {
 912                 block1 = ufs_fragstoblks (frag2);
 913                 block2 = ufs_fragstoblks (frag3);
 914         }
 915 
 916         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 917              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 918              (unsigned long long)frag1, (unsigned long long)frag2,
 919              (unsigned long long)block1, (unsigned long long)block2,
 920              (unsigned long long)frag3, (unsigned long long)frag4);
 921 
 922         if (frag1 >= frag2)
 923                 goto next1;
 924 
 925         /*
 926          * Free first free fragments
 927          */
 928         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 929         tmp = ufs_data_ptr_to_cpu(sb, p);
 930         if (!tmp )
 931                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 932         frag2 -= frag1;
 933         frag1 = ufs_fragnum (frag1);
 934 
 935         ufs_free_fragments(inode, tmp + frag1, frag2);
 936 
 937 next1:
 938         /*
 939          * Free whole blocks
 940          */
 941         for (i = block1 ; i < block2; i++) {
 942                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 943                 tmp = ufs_data_ptr_to_cpu(sb, p);
 944                 if (!tmp)
 945                         continue;
 946                 write_seqlock(&ufsi->meta_lock);
 947                 ufs_data_ptr_clear(uspi, p);
 948                 write_sequnlock(&ufsi->meta_lock);
 949 
 950                 free_data(&ctx, tmp, uspi->s_fpb);
 951         }
 952 
 953         free_data(&ctx, 0, 0);
 954 
 955         if (frag3 >= frag4)
 956                 goto next3;
 957 
 958         /*
 959          * Free last free fragments
 960          */
 961         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 962         tmp = ufs_data_ptr_to_cpu(sb, p);
 963         if (!tmp )
 964                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 965         frag4 = ufs_fragnum (frag4);
 966         write_seqlock(&ufsi->meta_lock);
 967         ufs_data_ptr_clear(uspi, p);
 968         write_sequnlock(&ufsi->meta_lock);
 969 
 970         ufs_free_fragments (inode, tmp, frag4);
 971  next3:
 972 
 973         UFSD("EXIT: ino %lu\n", inode->i_ino);
 974 }
 975 
 976 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 977 {
 978         struct super_block *sb = inode->i_sb;
 979         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 980         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 981         unsigned i;
 982 
 983         if (!ubh)
 984                 return;
 985 
 986         if (--depth) {
 987                 for (i = 0; i < uspi->s_apb; i++) {
 988                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 989                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 990                         if (block)
 991                                 free_full_branch(inode, block, depth);
 992                 }
 993         } else {
 994                 struct to_free ctx = {.inode = inode};
 995 
 996                 for (i = 0; i < uspi->s_apb; i++) {
 997                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 998                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 999                         if (block)
1000                                 free_data(&ctx, block, uspi->s_fpb);
1001                 }
1002                 free_data(&ctx, 0, 0);
1003         }
1004 
1005         ubh_bforget(ubh);
1006         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1007 }
1008 
1009 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1010 {
1011         struct super_block *sb = inode->i_sb;
1012         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1013         unsigned i;
1014 
1015         if (--depth) {
1016                 for (i = from; i < uspi->s_apb ; i++) {
1017                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1018                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1019                         if (block) {
1020                                 write_seqlock(&UFS_I(inode)->meta_lock);
1021                                 ufs_data_ptr_clear(uspi, p);
1022                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1023                                 ubh_mark_buffer_dirty(ubh);
1024                                 free_full_branch(inode, block, depth);
1025                         }
1026                 }
1027         } else {
1028                 struct to_free ctx = {.inode = inode};
1029 
1030                 for (i = from; i < uspi->s_apb; i++) {
1031                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1032                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1033                         if (block) {
1034                                 write_seqlock(&UFS_I(inode)->meta_lock);
1035                                 ufs_data_ptr_clear(uspi, p);
1036                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1037                                 ubh_mark_buffer_dirty(ubh);
1038                                 free_data(&ctx, block, uspi->s_fpb);
1039                         }
1040                 }
1041                 free_data(&ctx, 0, 0);
1042         }
1043         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1044                 ubh_sync_block(ubh);
1045         ubh_brelse(ubh);
1046 }
1047 
1048 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1049 {
1050         int err = 0;
1051         struct super_block *sb = inode->i_sb;
1052         struct address_space *mapping = inode->i_mapping;
1053         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1054         unsigned i, end;
1055         sector_t lastfrag;
1056         struct page *lastpage;
1057         struct buffer_head *bh;
1058         u64 phys64;
1059 
1060         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1061 
1062         if (!lastfrag)
1063                 goto out;
1064 
1065         lastfrag--;
1066 
1067         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1068                                        (PAGE_SHIFT - inode->i_blkbits));
1069        if (IS_ERR(lastpage)) {
1070                err = -EIO;
1071                goto out;
1072        }
1073 
1074        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1075        bh = page_buffers(lastpage);
1076        for (i = 0; i < end; ++i)
1077                bh = bh->b_this_page;
1078 
1079 
1080        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1081 
1082        if (unlikely(err))
1083                goto out_unlock;
1084 
1085        if (buffer_new(bh)) {
1086                clear_buffer_new(bh);
1087                clean_bdev_bh_alias(bh);
1088                /*
1089                 * we do not zeroize fragment, because of
1090                 * if it maped to hole, it already contains zeroes
1091                 */
1092                set_buffer_uptodate(bh);
1093                mark_buffer_dirty(bh);
1094                set_page_dirty(lastpage);
1095        }
1096 
1097        if (lastfrag >= UFS_IND_FRAGMENT) {
1098                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1099                phys64 = bh->b_blocknr + 1;
1100                for (i = 0; i < end; ++i) {
1101                        bh = sb_getblk(sb, i + phys64);
1102                        lock_buffer(bh);
1103                        memset(bh->b_data, 0, sb->s_blocksize);
1104                        set_buffer_uptodate(bh);
1105                        mark_buffer_dirty(bh);
1106                        unlock_buffer(bh);
1107                        sync_dirty_buffer(bh);
1108                        brelse(bh);
1109                }
1110        }
1111 out_unlock:
1112        ufs_put_locked_page(lastpage);
1113 out:
1114        return err;
1115 }
1116 
1117 static void ufs_truncate_blocks(struct inode *inode)
1118 {
1119         struct ufs_inode_info *ufsi = UFS_I(inode);
1120         struct super_block *sb = inode->i_sb;
1121         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1122         unsigned offsets[4];
1123         int depth;
1124         int depth2;
1125         unsigned i;
1126         struct ufs_buffer_head *ubh[3];
1127         void *p;
1128         u64 block;
1129 
1130         if (inode->i_size) {
1131                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1132                 depth = ufs_block_to_path(inode, last, offsets);
1133                 if (!depth)
1134                         return;
1135         } else {
1136                 depth = 1;
1137         }
1138 
1139         for (depth2 = depth - 1; depth2; depth2--)
1140                 if (offsets[depth2] != uspi->s_apb - 1)
1141                         break;
1142 
1143         mutex_lock(&ufsi->truncate_mutex);
1144         if (depth == 1) {
1145                 ufs_trunc_direct(inode);
1146                 offsets[0] = UFS_IND_BLOCK;
1147         } else {
1148                 /* get the blocks that should be partially emptied */
1149                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1150                 for (i = 0; i < depth2; i++) {
1151                         block = ufs_data_ptr_to_cpu(sb, p);
1152                         if (!block)
1153                                 break;
1154                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1155                         if (!ubh[i]) {
1156                                 write_seqlock(&ufsi->meta_lock);
1157                                 ufs_data_ptr_clear(uspi, p);
1158                                 write_sequnlock(&ufsi->meta_lock);
1159                                 break;
1160                         }
1161                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1162                 }
1163                 while (i--)
1164                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1165         }
1166         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1167                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1168                 block = ufs_data_ptr_to_cpu(sb, p);
1169                 if (block) {
1170                         write_seqlock(&ufsi->meta_lock);
1171                         ufs_data_ptr_clear(uspi, p);
1172                         write_sequnlock(&ufsi->meta_lock);
1173                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1174                 }
1175         }
1176         read_seqlock_excl(&ufsi->meta_lock);
1177         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1178         read_sequnlock_excl(&ufsi->meta_lock);
1179         mark_inode_dirty(inode);
1180         mutex_unlock(&ufsi->truncate_mutex);
1181 }
1182 
1183 static int ufs_truncate(struct inode *inode, loff_t size)
1184 {
1185         int err = 0;
1186 
1187         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1188              inode->i_ino, (unsigned long long)size,
1189              (unsigned long long)i_size_read(inode));
1190 
1191         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1192               S_ISLNK(inode->i_mode)))
1193                 return -EINVAL;
1194         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1195                 return -EPERM;
1196 
1197         err = ufs_alloc_lastblock(inode, size);
1198 
1199         if (err)
1200                 goto out;
1201 
1202         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1203 
1204         truncate_setsize(inode, size);
1205 
1206         ufs_truncate_blocks(inode);
1207         inode->i_mtime = inode->i_ctime = current_time(inode);
1208         mark_inode_dirty(inode);
1209 out:
1210         UFSD("EXIT: err %d\n", err);
1211         return err;
1212 }
1213 
1214 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1215 {
1216         struct inode *inode = d_inode(dentry);
1217         unsigned int ia_valid = attr->ia_valid;
1218         int error;
1219 
1220         error = setattr_prepare(dentry, attr);
1221         if (error)
1222                 return error;
1223 
1224         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1225                 error = ufs_truncate(inode, attr->ia_size);
1226                 if (error)
1227                         return error;
1228         }
1229 
1230         setattr_copy(inode, attr);
1231         mark_inode_dirty(inode);
1232         return 0;
1233 }
1234 
1235 const struct inode_operations ufs_file_inode_operations = {
1236         .setattr = ufs_setattr,
1237 };
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root/fs/ufs/inode.c

DEFINITIONS
