fs/ufs/inode.c

   1 /*
   2  *  linux/fs/ufs/inode.c
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  *
   8  *  from
   9  *
  10  *  linux/fs/ext2/inode.c
  11  *
  12  * Copyright (C) 1992, 1993, 1994, 1995
  13  * Remy Card (card@masi.ibp.fr)
  14  * Laboratoire MASI - Institut Blaise Pascal
  15  * Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *  from
  18  *
  19  *  linux/fs/minix/inode.c
  20  *
  21  *  Copyright (C) 1991, 1992  Linus Torvalds
  22  *
  23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  24  *  Big-endian to little-endian byte-swapping/bitmaps by
  25  *        David S. Miller (davem@caip.rutgers.edu), 1995
  26  */
  27
  28 #include <asm/uaccess.h>
  29
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/time.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38
  39 #include "ufs_fs.h"
  40 #include "ufs.h"
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  45 {
  46         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  47         int ptrs = uspi->s_apb;
  48         int ptrs_bits = uspi->s_apbshift;
  49         const long direct_blocks = UFS_NDADDR,
  50                 indirect_blocks = ptrs,
  51                 double_blocks = (1 << (ptrs_bits * 2));
  52         int n = 0;
  53
  54
  55         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  56         if (i_block < direct_blocks) {
  57                 offsets[n++] = i_block;
  58         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  59                 offsets[n++] = UFS_IND_BLOCK;
  60                 offsets[n++] = i_block;
  61         } else if ((i_block -= indirect_blocks) < double_blocks) {
  62                 offsets[n++] = UFS_DIND_BLOCK;
  63                 offsets[n++] = i_block >> ptrs_bits;
  64                 offsets[n++] = i_block & (ptrs - 1);
  65         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  66                 offsets[n++] = UFS_TIND_BLOCK;
  67                 offsets[n++] = i_block >> (ptrs_bits * 2);
  68                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  69                 offsets[n++] = i_block & (ptrs - 1);
  70         } else {
  71                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  72         }
  73         return n;
  74 }
  75
  76 typedef struct {
  77         void    *p;
  78         union {
  79                 __fs32  key32;
  80                 __fs64  key64;
  81         };
  82         struct buffer_head *bh;
  83 } Indirect;
  84
  85 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  86                                struct buffer_head *bh, __fs32 *v,
  87                                Indirect *from, Indirect *to)
  88 {
  89         Indirect *p;
  90         unsigned seq;
  91         to->bh = bh;
  92         do {
  93                 seq = read_seqbegin(&ufsi->meta_lock);
  94                 to->key32 = *(__fs32 *)(to->p = v);
  95                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  96                         ;
  97         } while (read_seqretry(&ufsi->meta_lock, seq));
  98         return (p > to);
  99 }
 100
 101 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 102                                struct buffer_head *bh, __fs64 *v,
 103                                Indirect *from, Indirect *to)
 104 {
 105         Indirect *p;
 106         unsigned seq;
 107         to->bh = bh;
 108         do {
 109                 seq = read_seqbegin(&ufsi->meta_lock);
 110                 to->key64 = *(__fs64 *)(to->p = v);
 111                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 112                         ;
 113         } while (read_seqretry(&ufsi->meta_lock, seq));
 114         return (p > to);
 115 }
 116
 117 /*
 118  * Returns the location of the fragment from
 119  * the beginning of the filesystem.
 120  */
 121
 122 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 123 {
 124         struct ufs_inode_info *ufsi = UFS_I(inode);
 125         struct super_block *sb = inode->i_sb;
 126         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 127         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 128         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 129         Indirect chain[4], *q = chain;
 130         unsigned *p;
 131         unsigned flags = UFS_SB(sb)->s_flags;
 132         u64 res = 0;
 133
 134         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 135                 uspi->s_fpbshift, uspi->s_apbmask,
 136                 (unsigned long long)mask);
 137
 138         if (depth == 0)
 139                 goto no_block;
 140
 141 again:
 142         p = offsets;
 143
 144         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 145                 goto ufs2;
 146
 147         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 148                 goto changed;
 149         if (!q->key32)
 150                 goto no_block;
 151         while (--depth) {
 152                 __fs32 *ptr;
 153                 struct buffer_head *bh;
 154                 unsigned n = *p++;
 155
 156                 bh = sb_bread(sb, uspi->s_sbbase +
 157                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 158                 if (!bh)
 159                         goto no_block;
 160                 ptr = (__fs32 *)bh->b_data + (n & mask);
 161                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 162                         goto changed;
 163                 if (!q->key32)
 164                         goto no_block;
 165         }
 166         res = fs32_to_cpu(sb, q->key32);
 167         goto found;
 168
 169 ufs2:
 170         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 171                 goto changed;
 172         if (!q->key64)
 173                 goto no_block;
 174
 175         while (--depth) {
 176                 __fs64 *ptr;
 177                 struct buffer_head *bh;
 178                 unsigned n = *p++;
 179
 180                 bh = sb_bread(sb, uspi->s_sbbase +
 181                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 182                 if (!bh)
 183                         goto no_block;
 184                 ptr = (__fs64 *)bh->b_data + (n & mask);
 185                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 186                         goto changed;
 187                 if (!q->key64)
 188                         goto no_block;
 189         }
 190         res = fs64_to_cpu(sb, q->key64);
 191 found:
 192         res += uspi->s_sbbase;
 193 no_block:
 194         while (q > chain) {
 195                 brelse(q->bh);
 196                 q--;
 197         }
 198         return res;
 199
 200 changed:
 201         while (q > chain) {
 202                 brelse(q->bh);
 203                 q--;
 204         }
 205         goto again;
 206 }
 207
 208 /*
 209  * Unpacking tails: we have a file with partial final block and
 210  * we had been asked to extend it.  If the fragment being written
 211  * is within the same block, we need to extend the tail just to cover
 212  * that fragment.  Otherwise the tail is extended to full block.
 213  *
 214  * Note that we might need to create a _new_ tail, but that will
 215  * be handled elsewhere; this is strictly for resizing old
 216  * ones.
 217  */
 218 static bool
 219 ufs_extend_tail(struct inode *inode, u64 writes_to,
 220                   int *err, struct page *locked_page)
 221 {
 222         struct ufs_inode_info *ufsi = UFS_I(inode);
 223         struct super_block *sb = inode->i_sb;
 224         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 225         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 226         unsigned block = ufs_fragstoblks(lastfrag);
 227         unsigned new_size;
 228         void *p;
 229         u64 tmp;
 230
 231         if (writes_to < (lastfrag | uspi->s_fpbmask))
 232                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 233         else
 234                 new_size = uspi->s_fpb;
 235
 236         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 237         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 238                                 new_size, err, locked_page);
 239         return tmp != 0;
 240 }
 241
 242 /**
 243  * ufs_inode_getfrag() - allocate new fragment(s)
 244  * @inode: pointer to inode
 245  * @index: number of block pointer within the inode's array.
 246  * @new_fragment: number of new allocated fragment(s)
 247  * @err: we set it if something wrong
 248  * @phys: pointer to where we save physical number of new allocated fragments,
 249  *   NULL if we allocate not data(indirect blocks for example).
 250  * @new: we set it if we allocate new block
 251  * @locked_page: for ufs_new_fragments()
 252  */
 253 static u64
 254 ufs_inode_getfrag(struct inode *inode, unsigned index,
 255                   sector_t new_fragment, int *err,
 256                   long *phys, int *new, struct page *locked_page)
 257 {
 258         struct ufs_inode_info *ufsi = UFS_I(inode);
 259         struct super_block *sb = inode->i_sb;
 260         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 261         u64 tmp, goal, lastfrag;
 262         unsigned nfrags = uspi->s_fpb;
 263         void *p;
 264
 265         /* TODO : to be done for write support
 266         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 267              goto ufs2;
 268          */
 269
 270         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 271         tmp = ufs_data_ptr_to_cpu(sb, p);
 272         if (tmp)
 273                 goto out;
 274
 275         lastfrag = ufsi->i_lastfrag;
 276
 277         /* will that be a new tail? */
 278         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 279                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 280
 281         goal = 0;
 282         if (index) {
 283                 goal = ufs_data_ptr_to_cpu(sb,
 284                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 285                 if (goal)
 286                         goal += uspi->s_fpb;
 287         }
 288         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 289                                 goal, uspi->s_fpb, err,
 290                                 phys != NULL ? locked_page : NULL);
 291
 292         if (!tmp) {
 293                 *err = -ENOSPC;
 294                 return 0;
 295         }
 296
 297         if (phys) {
 298                 *err = 0;
 299                 *new = 1;
 300         }
 301         inode->i_ctime = CURRENT_TIME_SEC;
 302         if (IS_SYNC(inode))
 303                 ufs_sync_inode (inode);
 304         mark_inode_dirty(inode);
 305 out:
 306         return tmp + uspi->s_sbbase;
 307
 308      /* This part : To be implemented ....
 309         Required only for writing, not required for READ-ONLY.
 310 ufs2:
 311
 312         u2_block = ufs_fragstoblks(fragment);
 313         u2_blockoff = ufs_fragnum(fragment);
 314         p = ufsi->i_u1.u2_i_data + block;
 315         goal = 0;
 316
 317 repeat2:
 318         tmp = fs32_to_cpu(sb, *p);
 319         lastfrag = ufsi->i_lastfrag;
 320
 321      */
 322 }
 323
 324 /**
 325  * ufs_inode_getblock() - allocate new block
 326  * @inode: pointer to inode
 327  * @ind_block: block number of the indirect block
 328  * @index: number of pointer within the indirect block
 329  * @new_fragment: number of new allocated fragment
 330  *  (block will hold this fragment and also uspi->s_fpb-1)
 331  * @err: see ufs_inode_getfrag()
 332  * @phys: see ufs_inode_getfrag()
 333  * @new: see ufs_inode_getfrag()
 334  * @locked_page: see ufs_inode_getfrag()
 335  */
 336 static u64
 337 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 338                   unsigned index, sector_t new_fragment, int *err,
 339                   long *phys, int *new, struct page *locked_page)
 340 {
 341         struct super_block *sb = inode->i_sb;
 342         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 343         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 344         u64 tmp = 0, goal;
 345         struct buffer_head *bh;
 346         void *p;
 347
 348         if (!ind_block)
 349                 return 0;
 350
 351         bh = sb_bread(sb, ind_block + (index >> shift));
 352         if (unlikely(!bh)) {
 353                 *err = -EIO;
 354                 return 0;
 355         }
 356
 357         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 358         if (uspi->fs_magic == UFS2_MAGIC)
 359                 p = (__fs64 *)bh->b_data + index;
 360         else
 361                 p = (__fs32 *)bh->b_data + index;
 362
 363         tmp = ufs_data_ptr_to_cpu(sb, p);
 364         if (tmp)
 365                 goto out;
 366
 367         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 368                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 369                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 370                 goal = tmp + uspi->s_fpb;
 371         else
 372                 goal = bh->b_blocknr + uspi->s_fpb;
 373         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 374                                 uspi->s_fpb, err, locked_page);
 375         if (!tmp)
 376                 goto out;
 377
 378         if (new)
 379                 *new = 1;
 380
 381         mark_buffer_dirty(bh);
 382         if (IS_SYNC(inode))
 383                 sync_dirty_buffer(bh);
 384         inode->i_ctime = CURRENT_TIME_SEC;
 385         mark_inode_dirty(inode);
 386 out:
 387         brelse (bh);
 388         UFSD("EXIT\n");
 389         if (tmp)
 390                 tmp += uspi->s_sbbase;
 391         return tmp;
 392 }
 393
 394 /**
 395  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 396  * readpage, writepage and so on
 397  */
 398
 399 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 400 {
 401         struct super_block *sb = inode->i_sb;
 402         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 403         int err = 0, new = 0;
 404         unsigned offsets[4];
 405         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 406         u64 phys64 = 0;
 407         unsigned long phys;
 408         unsigned frag = fragment & uspi->s_fpbmask;
 409
 410         if (!create) {
 411                 phys64 = ufs_frag_map(inode, offsets, depth);
 412                 goto out;
 413         }
 414
 415         /* This code entered only while writing ....? */
 416
 417         mutex_lock(&UFS_I(inode)->truncate_mutex);
 418
 419         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 420         if (unlikely(!depth)) {
 421                 ufs_warning(sb, "ufs_get_block", "block > big");
 422                 err = -EIO;
 423                 goto out;
 424         }
 425
 426         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 427                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 428                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 429                 if (tailfrags && fragment >= lastfrag) {
 430                         if (!ufs_extend_tail(inode, fragment,
 431                                              &err, bh_result->b_page))
 432                                 goto out;
 433                 }
 434         }
 435
 436         if (depth == 1) {
 437                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 438                                            &err, &phys, &new, bh_result->b_page);
 439         } else {
 440                 int i;
 441                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 442                                            &err, NULL, NULL, bh_result->b_page);
 443                 for (i = 1; i < depth - 1; i++)
 444                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 445                                                 fragment, &err, NULL, NULL, NULL);
 446                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 447                                         fragment, &err, &phys, &new, bh_result->b_page);
 448         }
 449 out:
 450         if (phys64) {
 451                 phys64 += frag;
 452                 map_bh(bh_result, sb, phys64);
 453                 if (new)
 454                         set_buffer_new(bh_result);
 455         }
 456         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 457         return err;
 458 }
 459
 460 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 461 {
 462         return block_write_full_page(page,ufs_getfrag_block,wbc);
 463 }
 464
 465 static int ufs_readpage(struct file *file, struct page *page)
 466 {
 467         return block_read_full_page(page,ufs_getfrag_block);
 468 }
 469
 470 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 471 {
 472         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 473 }
 474
 475 static void ufs_truncate_blocks(struct inode *);
 476
 477 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 478 {
 479         struct inode *inode = mapping->host;
 480
 481         if (to > inode->i_size) {
 482                 truncate_pagecache(inode, inode->i_size);
 483                 ufs_truncate_blocks(inode);
 484         }
 485 }
 486
 487 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 488                         loff_t pos, unsigned len, unsigned flags,
 489                         struct page **pagep, void **fsdata)
 490 {
 491         int ret;
 492
 493         ret = block_write_begin(mapping, pos, len, flags, pagep,
 494                                 ufs_getfrag_block);
 495         if (unlikely(ret))
 496                 ufs_write_failed(mapping, pos + len);
 497
 498         return ret;
 499 }
 500
 501 static int ufs_write_end(struct file *file, struct address_space *mapping,
 502                         loff_t pos, unsigned len, unsigned copied,
 503                         struct page *page, void *fsdata)
 504 {
 505         int ret;
 506
 507         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 508         if (ret < len)
 509                 ufs_write_failed(mapping, pos + len);
 510         return ret;
 511 }
 512
 513 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 514 {
 515         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 516 }
 517
 518 const struct address_space_operations ufs_aops = {
 519         .readpage = ufs_readpage,
 520         .writepage = ufs_writepage,
 521         .write_begin = ufs_write_begin,
 522         .write_end = ufs_write_end,
 523         .bmap = ufs_bmap
 524 };
 525
 526 static void ufs_set_inode_ops(struct inode *inode)
 527 {
 528         if (S_ISREG(inode->i_mode)) {
 529                 inode->i_op = &ufs_file_inode_operations;
 530                 inode->i_fop = &ufs_file_operations;
 531                 inode->i_mapping->a_ops = &ufs_aops;
 532         } else if (S_ISDIR(inode->i_mode)) {
 533                 inode->i_op = &ufs_dir_inode_operations;
 534                 inode->i_fop = &ufs_dir_operations;
 535                 inode->i_mapping->a_ops = &ufs_aops;
 536         } else if (S_ISLNK(inode->i_mode)) {
 537                 if (!inode->i_blocks) {
 538                         inode->i_op = &ufs_fast_symlink_inode_operations;
 539                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 540                 } else {
 541                         inode->i_op = &ufs_symlink_inode_operations;
 542                         inode->i_mapping->a_ops = &ufs_aops;
 543                 }
 544         } else
 545                 init_special_inode(inode, inode->i_mode,
 546                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 547 }
 548
 549 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 550 {
 551         struct ufs_inode_info *ufsi = UFS_I(inode);
 552         struct super_block *sb = inode->i_sb;
 553         umode_t mode;
 554
 555         /*
 556          * Copy data to the in-core inode.
 557          */
 558         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 559         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 560         if (inode->i_nlink == 0) {
 561                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 562                 return -1;
 563         }
 564
 565         /*
 566          * Linux now has 32-bit uid and gid, so we can support EFT.
 567          */
 568         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 569         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 570
 571         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 572         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 573         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 574         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 575         inode->i_mtime.tv_nsec = 0;
 576         inode->i_atime.tv_nsec = 0;
 577         inode->i_ctime.tv_nsec = 0;
 578         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 579         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 580         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 581         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 582         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 583
 584
 585         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 586                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 587                        sizeof(ufs_inode->ui_u2.ui_addr));
 588         } else {
 589                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 590                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 591                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 592         }
 593         return 0;
 594 }
 595
 596 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 597 {
 598         struct ufs_inode_info *ufsi = UFS_I(inode);
 599         struct super_block *sb = inode->i_sb;
 600         umode_t mode;
 601
 602         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 603         /*
 604          * Copy data to the in-core inode.
 605          */
 606         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 607         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 608         if (inode->i_nlink == 0) {
 609                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 610                 return -1;
 611         }
 612
 613         /*
 614          * Linux now has 32-bit uid and gid, so we can support EFT.
 615          */
 616         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 617         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 618
 619         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 620         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 621         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 622         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 623         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 624         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 625         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 626         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 627         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 628         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 629         /*
 630         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 631         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 632         */
 633
 634         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 635                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 636                        sizeof(ufs2_inode->ui_u2.ui_addr));
 637         } else {
 638                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 639                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 640                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 641         }
 642         return 0;
 643 }
 644
 645 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 646 {
 647         struct ufs_inode_info *ufsi;
 648         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 649         struct buffer_head * bh;
 650         struct inode *inode;
 651         int err;
 652
 653         UFSD("ENTER, ino %lu\n", ino);
 654
 655         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 656                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 657                             ino);
 658                 return ERR_PTR(-EIO);
 659         }
 660
 661         inode = iget_locked(sb, ino);
 662         if (!inode)
 663                 return ERR_PTR(-ENOMEM);
 664         if (!(inode->i_state & I_NEW))
 665                 return inode;
 666
 667         ufsi = UFS_I(inode);
 668
 669         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 670         if (!bh) {
 671                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 672                             inode->i_ino);
 673                 goto bad_inode;
 674         }
 675         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 676                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 677
 678                 err = ufs2_read_inode(inode,
 679                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 680         } else {
 681                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 682
 683                 err = ufs1_read_inode(inode,
 684                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 685         }
 686
 687         if (err)
 688                 goto bad_inode;
 689         inode->i_version++;
 690         ufsi->i_lastfrag =
 691                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 692         ufsi->i_dir_start_lookup = 0;
 693         ufsi->i_osync = 0;
 694
 695         ufs_set_inode_ops(inode);
 696
 697         brelse(bh);
 698
 699         UFSD("EXIT\n");
 700         unlock_new_inode(inode);
 701         return inode;
 702
 703 bad_inode:
 704         iget_failed(inode);
 705         return ERR_PTR(-EIO);
 706 }
 707
 708 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 709 {
 710         struct super_block *sb = inode->i_sb;
 711         struct ufs_inode_info *ufsi = UFS_I(inode);
 712
 713         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 714         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 715
 716         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 717         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 718
 719         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 720         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 721         ufs_inode->ui_atime.tv_usec = 0;
 722         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 723         ufs_inode->ui_ctime.tv_usec = 0;
 724         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 725         ufs_inode->ui_mtime.tv_usec = 0;
 726         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 727         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 728         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 729
 730         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 731                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 732                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 733         }
 734
 735         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 736                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 737                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 738         } else if (inode->i_blocks) {
 739                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 740                        sizeof(ufs_inode->ui_u2.ui_addr));
 741         }
 742         else {
 743                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 744                        sizeof(ufs_inode->ui_u2.ui_symlink));
 745         }
 746
 747         if (!inode->i_nlink)
 748                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 749 }
 750
 751 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 752 {
 753         struct super_block *sb = inode->i_sb;
 754         struct ufs_inode_info *ufsi = UFS_I(inode);
 755
 756         UFSD("ENTER\n");
 757         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 758         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 759
 760         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 761         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 762
 763         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 764         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 765         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 766         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 767         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 768         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 769         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 770
 771         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 772         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 773         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 774
 775         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 776                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 777                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 778         } else if (inode->i_blocks) {
 779                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 780                        sizeof(ufs_inode->ui_u2.ui_addr));
 781         } else {
 782                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 783                        sizeof(ufs_inode->ui_u2.ui_symlink));
 784         }
 785
 786         if (!inode->i_nlink)
 787                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 788         UFSD("EXIT\n");
 789 }
 790
 791 static int ufs_update_inode(struct inode * inode, int do_sync)
 792 {
 793         struct super_block *sb = inode->i_sb;
 794         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 795         struct buffer_head * bh;
 796
 797         UFSD("ENTER, ino %lu\n", inode->i_ino);
 798
 799         if (inode->i_ino < UFS_ROOTINO ||
 800             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 801                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 802                 return -1;
 803         }
 804
 805         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 806         if (!bh) {
 807                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 808                 return -1;
 809         }
 810         if (uspi->fs_magic == UFS2_MAGIC) {
 811                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 812
 813                 ufs2_update_inode(inode,
 814                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 815         } else {
 816                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 817
 818                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 819         }
 820
 821         mark_buffer_dirty(bh);
 822         if (do_sync)
 823                 sync_dirty_buffer(bh);
 824         brelse (bh);
 825
 826         UFSD("EXIT\n");
 827         return 0;
 828 }
 829
 830 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 831 {
 832         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 833 }
 834
 835 int ufs_sync_inode (struct inode *inode)
 836 {
 837         return ufs_update_inode (inode, 1);
 838 }
 839
 840 void ufs_evict_inode(struct inode * inode)
 841 {
 842         int want_delete = 0;
 843
 844         if (!inode->i_nlink && !is_bad_inode(inode))
 845                 want_delete = 1;
 846
 847         truncate_inode_pages_final(&inode->i_data);
 848         if (want_delete) {
 849                 inode->i_size = 0;
 850                 if (inode->i_blocks)
 851                         ufs_truncate_blocks(inode);
 852         }
 853
 854         invalidate_inode_buffers(inode);
 855         clear_inode(inode);
 856
 857         if (want_delete)
 858                 ufs_free_inode(inode);
 859 }
 860
 861 struct to_free {
 862         struct inode *inode;
 863         u64 to;
 864         unsigned count;
 865 };
 866
 867 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 868 {
 869         if (ctx->count && ctx->to != from) {
 870                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 871                 ctx->count = 0;
 872         }
 873         ctx->count += count;
 874         ctx->to = from + count;
 875 }
 876
 877 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 878 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 879
 880 static void ufs_trunc_direct(struct inode *inode)
 881 {
 882         struct ufs_inode_info *ufsi = UFS_I(inode);
 883         struct super_block * sb;
 884         struct ufs_sb_private_info * uspi;
 885         void *p;
 886         u64 frag1, frag2, frag3, frag4, block1, block2;
 887         struct to_free ctx = {.inode = inode};
 888         unsigned i, tmp;
 889
 890         UFSD("ENTER: ino %lu\n", inode->i_ino);
 891
 892         sb = inode->i_sb;
 893         uspi = UFS_SB(sb)->s_uspi;
 894
 895         frag1 = DIRECT_FRAGMENT;
 896         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 897         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 898         frag3 = frag4 & ~uspi->s_fpbmask;
 899         block1 = block2 = 0;
 900         if (frag2 > frag3) {
 901                 frag2 = frag4;
 902                 frag3 = frag4 = 0;
 903         } else if (frag2 < frag3) {
 904                 block1 = ufs_fragstoblks (frag2);
 905                 block2 = ufs_fragstoblks (frag3);
 906         }
 907
 908         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 909              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 910              (unsigned long long)frag1, (unsigned long long)frag2,
 911              (unsigned long long)block1, (unsigned long long)block2,
 912              (unsigned long long)frag3, (unsigned long long)frag4);
 913
 914         if (frag1 >= frag2)
 915                 goto next1;
 916
 917         /*
 918          * Free first free fragments
 919          */
 920         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 921         tmp = ufs_data_ptr_to_cpu(sb, p);
 922         if (!tmp )
 923                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 924         frag2 -= frag1;
 925         frag1 = ufs_fragnum (frag1);
 926
 927         ufs_free_fragments(inode, tmp + frag1, frag2);
 928
 929 next1:
 930         /*
 931          * Free whole blocks
 932          */
 933         for (i = block1 ; i < block2; i++) {
 934                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 935                 tmp = ufs_data_ptr_to_cpu(sb, p);
 936                 if (!tmp)
 937                         continue;
 938                 write_seqlock(&ufsi->meta_lock);
 939                 ufs_data_ptr_clear(uspi, p);
 940                 write_sequnlock(&ufsi->meta_lock);
 941
 942                 free_data(&ctx, tmp, uspi->s_fpb);
 943         }
 944
 945         free_data(&ctx, 0, 0);
 946
 947         if (frag3 >= frag4)
 948                 goto next3;
 949
 950         /*
 951          * Free last free fragments
 952          */
 953         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 954         tmp = ufs_data_ptr_to_cpu(sb, p);
 955         if (!tmp )
 956                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 957         frag4 = ufs_fragnum (frag4);
 958         write_seqlock(&ufsi->meta_lock);
 959         ufs_data_ptr_clear(uspi, p);
 960         write_sequnlock(&ufsi->meta_lock);
 961
 962         ufs_free_fragments (inode, tmp, frag4);
 963  next3:
 964
 965         UFSD("EXIT: ino %lu\n", inode->i_ino);
 966 }
 967
 968 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 969 {
 970         struct super_block *sb = inode->i_sb;
 971         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 972         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 973         unsigned i;
 974
 975         if (!ubh)
 976                 return;
 977
 978         if (--depth) {
 979                 for (i = 0; i < uspi->s_apb; i++) {
 980                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 981                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 982                         if (block)
 983                                 free_full_branch(inode, block, depth);
 984                 }
 985         } else {
 986                 struct to_free ctx = {.inode = inode};
 987
 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_data(&ctx, block, uspi->s_fpb);
 993                 }
 994                 free_data(&ctx, 0, 0);
 995         }
 996
 997         ubh_bforget(ubh);
 998         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
 999 }
1000
1001 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1002 {
1003         struct super_block *sb = inode->i_sb;
1004         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1005         unsigned i;
1006
1007         if (--depth) {
1008                 for (i = from; i < uspi->s_apb ; i++) {
1009                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1010                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1011                         if (block) {
1012                                 write_seqlock(&UFS_I(inode)->meta_lock);
1013                                 ufs_data_ptr_clear(uspi, p);
1014                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1015                                 ubh_mark_buffer_dirty(ubh);
1016                                 free_full_branch(inode, block, depth);
1017                         }
1018                 }
1019         } else {
1020                 struct to_free ctx = {.inode = inode};
1021
1022                 for (i = from; i < uspi->s_apb; i++) {
1023                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1024                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1025                         if (block) {
1026                                 write_seqlock(&UFS_I(inode)->meta_lock);
1027                                 ufs_data_ptr_clear(uspi, p);
1028                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1029                                 ubh_mark_buffer_dirty(ubh);
1030                                 free_data(&ctx, block, uspi->s_fpb);
1031                         }
1032                 }
1033                 free_data(&ctx, 0, 0);
1034         }
1035         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1036                 ubh_sync_block(ubh);
1037         ubh_brelse(ubh);
1038 }
1039
1040 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1041 {
1042         int err = 0;
1043         struct super_block *sb = inode->i_sb;
1044         struct address_space *mapping = inode->i_mapping;
1045         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1046         unsigned i, end;
1047         sector_t lastfrag;
1048         struct page *lastpage;
1049         struct buffer_head *bh;
1050         u64 phys64;
1051
1052         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1053
1054         if (!lastfrag)
1055                 goto out;
1056
1057         lastfrag--;
1058
1059         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1060                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1061        if (IS_ERR(lastpage)) {
1062                err = -EIO;
1063                goto out;
1064        }
1065
1066        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1067        bh = page_buffers(lastpage);
1068        for (i = 0; i < end; ++i)
1069                bh = bh->b_this_page;
1070
1071
1072        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1073
1074        if (unlikely(err))
1075                goto out_unlock;
1076
1077        if (buffer_new(bh)) {
1078                clear_buffer_new(bh);
1079                unmap_underlying_metadata(bh->b_bdev,
1080                                          bh->b_blocknr);
1081                /*
1082                 * we do not zeroize fragment, because of
1083                 * if it maped to hole, it already contains zeroes
1084                 */
1085                set_buffer_uptodate(bh);
1086                mark_buffer_dirty(bh);
1087                set_page_dirty(lastpage);
1088        }
1089
1090        if (lastfrag >= UFS_IND_FRAGMENT) {
1091                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1092                phys64 = bh->b_blocknr + 1;
1093                for (i = 0; i < end; ++i) {
1094                        bh = sb_getblk(sb, i + phys64);
1095                        lock_buffer(bh);
1096                        memset(bh->b_data, 0, sb->s_blocksize);
1097                        set_buffer_uptodate(bh);
1098                        mark_buffer_dirty(bh);
1099                        unlock_buffer(bh);
1100                        sync_dirty_buffer(bh);
1101                        brelse(bh);
1102                }
1103        }
1104 out_unlock:
1105        ufs_put_locked_page(lastpage);
1106 out:
1107        return err;
1108 }
1109
1110 static void __ufs_truncate_blocks(struct inode *inode)
1111 {
1112         struct ufs_inode_info *ufsi = UFS_I(inode);
1113         struct super_block *sb = inode->i_sb;
1114         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1115         unsigned offsets[4];
1116         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1117         int depth2;
1118         unsigned i;
1119         struct ufs_buffer_head *ubh[3];
1120         void *p;
1121         u64 block;
1122
1123         if (!depth)
1124                 return;
1125
1126         /* find the last non-zero in offsets[] */
1127         for (depth2 = depth - 1; depth2; depth2--)
1128                 if (offsets[depth2])
1129                         break;
1130
1131         mutex_lock(&ufsi->truncate_mutex);
1132         if (depth == 1) {
1133                 ufs_trunc_direct(inode);
1134                 offsets[0] = UFS_IND_BLOCK;
1135         } else {
1136                 /* get the blocks that should be partially emptied */
1137                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1138                 for (i = 0; i < depth2; i++) {
1139                         offsets[i]++;   /* next branch is fully freed */
1140                         block = ufs_data_ptr_to_cpu(sb, p);
1141                         if (!block)
1142                                 break;
1143                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1144                         if (!ubh[i]) {
1145                                 write_seqlock(&ufsi->meta_lock);
1146                                 ufs_data_ptr_clear(uspi, p);
1147                                 write_sequnlock(&ufsi->meta_lock);
1148                                 break;
1149                         }
1150                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1151                 }
1152                 while (i--)
1153                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1154         }
1155         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1156                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1157                 block = ufs_data_ptr_to_cpu(sb, p);
1158                 if (block) {
1159                         write_seqlock(&ufsi->meta_lock);
1160                         ufs_data_ptr_clear(uspi, p);
1161                         write_sequnlock(&ufsi->meta_lock);
1162                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1163                 }
1164         }
1165         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1166         mark_inode_dirty(inode);
1167         mutex_unlock(&ufsi->truncate_mutex);
1168 }
1169
1170 static int ufs_truncate(struct inode *inode, loff_t size)
1171 {
1172         int err = 0;
1173
1174         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1175              inode->i_ino, (unsigned long long)size,
1176              (unsigned long long)i_size_read(inode));
1177
1178         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1179               S_ISLNK(inode->i_mode)))
1180                 return -EINVAL;
1181         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1182                 return -EPERM;
1183
1184         err = ufs_alloc_lastblock(inode, size);
1185
1186         if (err)
1187                 goto out;
1188
1189         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1190
1191         truncate_setsize(inode, size);
1192
1193         __ufs_truncate_blocks(inode);
1194         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1195         mark_inode_dirty(inode);
1196 out:
1197         UFSD("EXIT: err %d\n", err);
1198         return err;
1199 }
1200
1201 void ufs_truncate_blocks(struct inode *inode)
1202 {
1203         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1204               S_ISLNK(inode->i_mode)))
1205                 return;
1206         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1207                 return;
1208         __ufs_truncate_blocks(inode);
1209 }
1210
1211 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1212 {
1213         struct inode *inode = d_inode(dentry);
1214         unsigned int ia_valid = attr->ia_valid;
1215         int error;
1216
1217         error = inode_change_ok(inode, attr);
1218         if (error)
1219                 return error;
1220
1221         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1222                 error = ufs_truncate(inode, attr->ia_size);
1223                 if (error)
1224                         return error;
1225         }
1226
1227         setattr_copy(inode, attr);
1228         mark_inode_dirty(inode);
1229         return 0;
1230 }
1231
1232 const struct inode_operations ufs_file_inode_operations = {
1233         .setattr = ufs_setattr,
1234 };