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  * ufs_inode_getfrag() - allocate new fragment(s)
 210  * @inode: pointer to inode
 211  * @fragment: number of `fragment' which hold pointer
 212  *   to new allocated fragment(s)
 213  * @new_fragment: number of new allocated fragment(s)
 214  * @required: how many fragment(s) we require
 215  * @err: we set it if something wrong
 216  * @phys: pointer to where we save physical number of new allocated fragments,
 217  *   NULL if we allocate not data(indirect blocks for example).
 218  * @new: we set it if we allocate new block
 219  * @locked_page: for ufs_new_fragments()
 220  */
 221 static u64
 222 ufs_inode_getfrag(struct inode *inode, u64 fragment,
 223                   sector_t new_fragment, unsigned int required, int *err,
 224                   long *phys, int *new, struct page *locked_page)
 225 {
 226         struct ufs_inode_info *ufsi = UFS_I(inode);
 227         struct super_block *sb = inode->i_sb;
 228         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 229         unsigned blockoff, lastblockoff;
 230         u64 tmp, goal, lastfrag, block, lastblock;
 231         void *p, *p2;
 232
 233         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
 234              "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
 235              (unsigned long long)new_fragment, required, !phys);
 236
 237         /* TODO : to be done for write support
 238         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 239              goto ufs2;
 240          */
 241
 242         block = ufs_fragstoblks (fragment);
 243         blockoff = ufs_fragnum (fragment);
 244         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 245
 246         goal = 0;
 247
 248         tmp = ufs_data_ptr_to_cpu(sb, p);
 249
 250         lastfrag = ufsi->i_lastfrag;
 251         if (tmp && fragment < lastfrag)
 252                 goto out;
 253
 254         lastblock = ufs_fragstoblks (lastfrag);
 255         lastblockoff = ufs_fragnum (lastfrag);
 256         /*
 257          * We will extend file into new block beyond last allocated block
 258          */
 259         if (lastblock < block) {
 260                 /*
 261                  * We must reallocate last allocated block
 262                  */
 263                 if (lastblockoff) {
 264                         p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
 265                         tmp = ufs_new_fragments(inode, p2, lastfrag,
 266                                                 ufs_data_ptr_to_cpu(sb, p2),
 267                                                 uspi->s_fpb - lastblockoff,
 268                                                 err, locked_page);
 269                         if (!tmp)
 270                                 return 0;
 271                         lastfrag = ufsi->i_lastfrag;
 272                 }
 273                 tmp = ufs_data_ptr_to_cpu(sb,
 274                                          ufs_get_direct_data_ptr(uspi, ufsi,
 275                                                                  lastblock));
 276                 if (tmp)
 277                         goal = tmp + uspi->s_fpb;
 278                 tmp = ufs_new_fragments (inode, p, fragment - blockoff,
 279                                          goal, required + blockoff,
 280                                          err,
 281                                          phys != NULL ? locked_page : NULL);
 282         } else if (lastblock == block) {
 283         /*
 284          * We will extend last allocated block
 285          */
 286                 tmp = ufs_new_fragments(inode, p, fragment -
 287                                         (blockoff - lastblockoff),
 288                                         ufs_data_ptr_to_cpu(sb, p),
 289                                         required +  (blockoff - lastblockoff),
 290                                         err, phys != NULL ? locked_page : NULL);
 291         } else /* (lastblock > block) */ {
 292         /*
 293          * We will allocate new block before last allocated block
 294          */
 295                 if (block) {
 296                         tmp = ufs_data_ptr_to_cpu(sb,
 297                                                  ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
 298                         if (tmp)
 299                                 goal = tmp + uspi->s_fpb;
 300                 }
 301                 tmp = ufs_new_fragments(inode, p, fragment - blockoff,
 302                                         goal, uspi->s_fpb, err,
 303                                         phys != NULL ? locked_page : NULL);
 304         }
 305         if (!tmp) {
 306                 *err = -ENOSPC;
 307                 return 0;
 308         }
 309
 310         if (phys) {
 311                 *err = 0;
 312                 *new = 1;
 313         }
 314         inode->i_ctime = CURRENT_TIME_SEC;
 315         if (IS_SYNC(inode))
 316                 ufs_sync_inode (inode);
 317         mark_inode_dirty(inode);
 318 out:
 319         return tmp + uspi->s_sbbase;
 320
 321      /* This part : To be implemented ....
 322         Required only for writing, not required for READ-ONLY.
 323 ufs2:
 324
 325         u2_block = ufs_fragstoblks(fragment);
 326         u2_blockoff = ufs_fragnum(fragment);
 327         p = ufsi->i_u1.u2_i_data + block;
 328         goal = 0;
 329
 330 repeat2:
 331         tmp = fs32_to_cpu(sb, *p);
 332         lastfrag = ufsi->i_lastfrag;
 333
 334      */
 335 }
 336
 337 /**
 338  * ufs_inode_getblock() - allocate new block
 339  * @inode: pointer to inode
 340  * @bh: pointer to block which hold "pointer" to new allocated block
 341  * @fragment: number of `fragment' which hold pointer
 342  *   to new allocated block
 343  * @new_fragment: number of new allocated fragment
 344  *  (block will hold this fragment and also uspi->s_fpb-1)
 345  * @err: see ufs_inode_getfrag()
 346  * @phys: see ufs_inode_getfrag()
 347  * @new: see ufs_inode_getfrag()
 348  * @locked_page: see ufs_inode_getfrag()
 349  */
 350 static u64
 351 ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
 352                   u64 fragment, sector_t new_fragment, int *err,
 353                   long *phys, int *new, struct page *locked_page)
 354 {
 355         struct super_block *sb = inode->i_sb;
 356         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 357         u64 tmp = 0, goal, block;
 358         void *p;
 359
 360         block = ufs_fragstoblks (fragment);
 361
 362         UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, metadata %d\n",
 363              inode->i_ino, (unsigned long long)fragment,
 364              (unsigned long long)new_fragment, !phys);
 365
 366         if (!bh)
 367                 goto out;
 368         if (!buffer_uptodate(bh)) {
 369                 ll_rw_block (READ, 1, &bh);
 370                 wait_on_buffer (bh);
 371                 if (!buffer_uptodate(bh))
 372                         goto out;
 373         }
 374         if (uspi->fs_magic == UFS2_MAGIC)
 375                 p = (__fs64 *)bh->b_data + block;
 376         else
 377                 p = (__fs32 *)bh->b_data + block;
 378
 379         tmp = ufs_data_ptr_to_cpu(sb, p);
 380         if (tmp)
 381                 goto out;
 382
 383         if (block && (uspi->fs_magic == UFS2_MAGIC ?
 384                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[block-1])) :
 385                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[block-1]))))
 386                 goal = tmp + uspi->s_fpb;
 387         else
 388                 goal = bh->b_blocknr + uspi->s_fpb;
 389         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 390                                 uspi->s_fpb, err, locked_page);
 391         if (!tmp)
 392                 goto out;
 393
 394         if (new)
 395                 *new = 1;
 396
 397         mark_buffer_dirty(bh);
 398         if (IS_SYNC(inode))
 399                 sync_dirty_buffer(bh);
 400         inode->i_ctime = CURRENT_TIME_SEC;
 401         mark_inode_dirty(inode);
 402 out:
 403         brelse (bh);
 404         UFSD("EXIT\n");
 405         if (tmp)
 406                 tmp += uspi->s_sbbase;
 407         return tmp;
 408 }
 409
 410 /**
 411  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 412  * readpage, writepage and so on
 413  */
 414
 415 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 416 {
 417         struct super_block * sb = inode->i_sb;
 418         struct ufs_sb_info * sbi = UFS_SB(sb);
 419         struct ufs_sb_private_info * uspi = sbi->s_uspi;
 420         struct buffer_head * bh;
 421         int ret, err, new;
 422         unsigned offsets[4];
 423         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 424         unsigned long ptr,phys;
 425         u64 phys64 = 0;
 426         unsigned frag = fragment & uspi->s_fpbmask;
 427
 428         if (!create) {
 429                 phys64 = ufs_frag_map(inode, offsets, depth);
 430                 if (phys64) {
 431                         phys64 += frag;
 432                         map_bh(bh_result, sb, phys64);
 433                 }
 434                 return 0;
 435         }
 436
 437         /* This code entered only while writing ....? */
 438
 439         err = -EIO;
 440         new = 0;
 441         ret = 0;
 442         bh = NULL;
 443
 444         mutex_lock(&UFS_I(inode)->truncate_mutex);
 445
 446         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 447         if (!depth)
 448                 goto abort_too_big;
 449
 450         err = 0;
 451         ptr = fragment;
 452
 453         if (depth == 1) {
 454                 phys64 = ufs_inode_getfrag(inode, ptr, fragment, 1, &err, &phys,
 455                                         &new, bh_result->b_page);
 456                 if (phys64) {
 457                         phys64 += frag;
 458                         phys = phys64;
 459                 }
 460                 goto out;
 461         }
 462         ptr -= UFS_NDIR_FRAGMENT;
 463         if (depth == 2) {
 464                 phys64 = ufs_inode_getfrag(inode,
 465                                         UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift),
 466                                         fragment, uspi->s_fpb, &err, NULL, NULL,
 467                                         bh_result->b_page);
 468                 if (phys64) {
 469                         phys64 += (ptr >> uspi->s_apbshift) & uspi->s_fpbmask;
 470                         bh = sb_getblk(sb, phys64);
 471                 } else {
 472                         bh = NULL;
 473                 }
 474                 goto get_indirect;
 475         }
 476         ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
 477         if (depth == 3) {
 478                 phys64 = ufs_inode_getfrag(inode,
 479                                         UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift),
 480                                         fragment, uspi->s_fpb, &err, NULL, NULL,
 481                                         bh_result->b_page);
 482                 if (phys64) {
 483                         phys64 += (ptr >> uspi->s_2apbshift) & uspi->s_fpbmask;
 484                         bh = sb_getblk(sb, phys64);
 485                 } else {
 486                         bh = NULL;
 487                 }
 488                 goto get_double;
 489         }
 490         ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
 491         phys64 = ufs_inode_getfrag(inode,
 492                                 UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift),
 493                                 fragment, uspi->s_fpb, &err, NULL, NULL,
 494                                 bh_result->b_page);
 495         if (phys64) {
 496                 phys64 += (ptr >> uspi->s_3apbshift) & uspi->s_fpbmask;
 497                 bh = sb_getblk(sb, phys64);
 498         } else {
 499                 bh = NULL;
 500         }
 501         phys64 = ufs_inode_getblock(inode, bh,
 502                                 (ptr >> uspi->s_2apbshift) & uspi->s_apbmask,
 503                                 fragment, &err, NULL, NULL, NULL);
 504         if (phys64) {
 505                 phys64 += (ptr >> uspi->s_2apbshift) & uspi->s_fpbmask,
 506                 bh = sb_getblk(sb, phys64);
 507         } else {
 508                 bh = NULL;
 509         }
 510 get_double:
 511         phys64 = ufs_inode_getblock(inode, bh,
 512                                 (ptr >> uspi->s_apbshift) & uspi->s_apbmask,
 513                                 fragment, &err, NULL, NULL, NULL);
 514         if (phys64) {
 515                 phys64 += (ptr >> uspi->s_apbshift) & uspi->s_fpbmask,
 516                 bh = sb_getblk(sb, phys64);
 517         } else {
 518                 bh = NULL;
 519         }
 520 get_indirect:
 521         phys64 = ufs_inode_getblock(inode, bh, ptr & uspi->s_apbmask, fragment,
 522                           &err, &phys, &new, bh_result->b_page);
 523         if (phys64) {
 524                 phys64 += frag;
 525                 phys = phys64;
 526         }
 527 out:
 528         if (err)
 529                 goto abort;
 530         if (new)
 531                 set_buffer_new(bh_result);
 532         map_bh(bh_result, sb, phys);
 533 abort:
 534         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 535
 536         return err;
 537
 538 abort_too_big:
 539         ufs_warning(sb, "ufs_get_block", "block > big");
 540         goto abort;
 541 }
 542
 543 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 544 {
 545         return block_write_full_page(page,ufs_getfrag_block,wbc);
 546 }
 547
 548 static int ufs_readpage(struct file *file, struct page *page)
 549 {
 550         return block_read_full_page(page,ufs_getfrag_block);
 551 }
 552
 553 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 554 {
 555         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 556 }
 557
 558 static void ufs_truncate_blocks(struct inode *);
 559
 560 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 561 {
 562         struct inode *inode = mapping->host;
 563
 564         if (to > inode->i_size) {
 565                 truncate_pagecache(inode, inode->i_size);
 566                 ufs_truncate_blocks(inode);
 567         }
 568 }
 569
 570 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 571                         loff_t pos, unsigned len, unsigned flags,
 572                         struct page **pagep, void **fsdata)
 573 {
 574         int ret;
 575
 576         ret = block_write_begin(mapping, pos, len, flags, pagep,
 577                                 ufs_getfrag_block);
 578         if (unlikely(ret))
 579                 ufs_write_failed(mapping, pos + len);
 580
 581         return ret;
 582 }
 583
 584 static int ufs_write_end(struct file *file, struct address_space *mapping,
 585                         loff_t pos, unsigned len, unsigned copied,
 586                         struct page *page, void *fsdata)
 587 {
 588         int ret;
 589
 590         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 591         if (ret < len)
 592                 ufs_write_failed(mapping, pos + len);
 593         return ret;
 594 }
 595
 596 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 597 {
 598         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 599 }
 600
 601 const struct address_space_operations ufs_aops = {
 602         .readpage = ufs_readpage,
 603         .writepage = ufs_writepage,
 604         .write_begin = ufs_write_begin,
 605         .write_end = ufs_write_end,
 606         .bmap = ufs_bmap
 607 };
 608
 609 static void ufs_set_inode_ops(struct inode *inode)
 610 {
 611         if (S_ISREG(inode->i_mode)) {
 612                 inode->i_op = &ufs_file_inode_operations;
 613                 inode->i_fop = &ufs_file_operations;
 614                 inode->i_mapping->a_ops = &ufs_aops;
 615         } else if (S_ISDIR(inode->i_mode)) {
 616                 inode->i_op = &ufs_dir_inode_operations;
 617                 inode->i_fop = &ufs_dir_operations;
 618                 inode->i_mapping->a_ops = &ufs_aops;
 619         } else if (S_ISLNK(inode->i_mode)) {
 620                 if (!inode->i_blocks) {
 621                         inode->i_op = &ufs_fast_symlink_inode_operations;
 622                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 623                 } else {
 624                         inode->i_op = &ufs_symlink_inode_operations;
 625                         inode->i_mapping->a_ops = &ufs_aops;
 626                 }
 627         } else
 628                 init_special_inode(inode, inode->i_mode,
 629                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 630 }
 631
 632 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 633 {
 634         struct ufs_inode_info *ufsi = UFS_I(inode);
 635         struct super_block *sb = inode->i_sb;
 636         umode_t mode;
 637
 638         /*
 639          * Copy data to the in-core inode.
 640          */
 641         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 642         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 643         if (inode->i_nlink == 0) {
 644                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 645                 return -1;
 646         }
 647
 648         /*
 649          * Linux now has 32-bit uid and gid, so we can support EFT.
 650          */
 651         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 652         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 653
 654         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 655         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 656         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 657         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 658         inode->i_mtime.tv_nsec = 0;
 659         inode->i_atime.tv_nsec = 0;
 660         inode->i_ctime.tv_nsec = 0;
 661         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 662         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 663         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 664         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 665         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 666
 667
 668         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 669                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 670                        sizeof(ufs_inode->ui_u2.ui_addr));
 671         } else {
 672                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 673                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 674                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 675         }
 676         return 0;
 677 }
 678
 679 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 680 {
 681         struct ufs_inode_info *ufsi = UFS_I(inode);
 682         struct super_block *sb = inode->i_sb;
 683         umode_t mode;
 684
 685         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 686         /*
 687          * Copy data to the in-core inode.
 688          */
 689         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 690         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 691         if (inode->i_nlink == 0) {
 692                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 693                 return -1;
 694         }
 695
 696         /*
 697          * Linux now has 32-bit uid and gid, so we can support EFT.
 698          */
 699         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 700         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 701
 702         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 703         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 704         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 705         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 706         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 707         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 708         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 709         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 710         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 711         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 712         /*
 713         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 714         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 715         */
 716
 717         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 718                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 719                        sizeof(ufs2_inode->ui_u2.ui_addr));
 720         } else {
 721                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 722                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 723                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 724         }
 725         return 0;
 726 }
 727
 728 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 729 {
 730         struct ufs_inode_info *ufsi;
 731         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 732         struct buffer_head * bh;
 733         struct inode *inode;
 734         int err;
 735
 736         UFSD("ENTER, ino %lu\n", ino);
 737
 738         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 739                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 740                             ino);
 741                 return ERR_PTR(-EIO);
 742         }
 743
 744         inode = iget_locked(sb, ino);
 745         if (!inode)
 746                 return ERR_PTR(-ENOMEM);
 747         if (!(inode->i_state & I_NEW))
 748                 return inode;
 749
 750         ufsi = UFS_I(inode);
 751
 752         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 753         if (!bh) {
 754                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 755                             inode->i_ino);
 756                 goto bad_inode;
 757         }
 758         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 759                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 760
 761                 err = ufs2_read_inode(inode,
 762                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 763         } else {
 764                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 765
 766                 err = ufs1_read_inode(inode,
 767                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 768         }
 769
 770         if (err)
 771                 goto bad_inode;
 772         inode->i_version++;
 773         ufsi->i_lastfrag =
 774                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 775         ufsi->i_dir_start_lookup = 0;
 776         ufsi->i_osync = 0;
 777
 778         ufs_set_inode_ops(inode);
 779
 780         brelse(bh);
 781
 782         UFSD("EXIT\n");
 783         unlock_new_inode(inode);
 784         return inode;
 785
 786 bad_inode:
 787         iget_failed(inode);
 788         return ERR_PTR(-EIO);
 789 }
 790
 791 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 792 {
 793         struct super_block *sb = inode->i_sb;
 794         struct ufs_inode_info *ufsi = UFS_I(inode);
 795
 796         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 797         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 798
 799         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 800         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 801
 802         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 803         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 804         ufs_inode->ui_atime.tv_usec = 0;
 805         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 806         ufs_inode->ui_ctime.tv_usec = 0;
 807         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 808         ufs_inode->ui_mtime.tv_usec = 0;
 809         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 810         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 811         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 812
 813         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 814                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 815                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 816         }
 817
 818         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 819                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 820                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 821         } else if (inode->i_blocks) {
 822                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 823                        sizeof(ufs_inode->ui_u2.ui_addr));
 824         }
 825         else {
 826                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 827                        sizeof(ufs_inode->ui_u2.ui_symlink));
 828         }
 829
 830         if (!inode->i_nlink)
 831                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 832 }
 833
 834 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 835 {
 836         struct super_block *sb = inode->i_sb;
 837         struct ufs_inode_info *ufsi = UFS_I(inode);
 838
 839         UFSD("ENTER\n");
 840         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 841         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 842
 843         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 844         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 845
 846         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 847         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 848         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 849         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 850         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 851         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 852         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 853
 854         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 855         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 856         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 857
 858         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 859                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 860                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 861         } else if (inode->i_blocks) {
 862                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 863                        sizeof(ufs_inode->ui_u2.ui_addr));
 864         } else {
 865                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 866                        sizeof(ufs_inode->ui_u2.ui_symlink));
 867         }
 868
 869         if (!inode->i_nlink)
 870                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 871         UFSD("EXIT\n");
 872 }
 873
 874 static int ufs_update_inode(struct inode * inode, int do_sync)
 875 {
 876         struct super_block *sb = inode->i_sb;
 877         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 878         struct buffer_head * bh;
 879
 880         UFSD("ENTER, ino %lu\n", inode->i_ino);
 881
 882         if (inode->i_ino < UFS_ROOTINO ||
 883             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 884                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 885                 return -1;
 886         }
 887
 888         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 889         if (!bh) {
 890                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 891                 return -1;
 892         }
 893         if (uspi->fs_magic == UFS2_MAGIC) {
 894                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 895
 896                 ufs2_update_inode(inode,
 897                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 898         } else {
 899                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 900
 901                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 902         }
 903
 904         mark_buffer_dirty(bh);
 905         if (do_sync)
 906                 sync_dirty_buffer(bh);
 907         brelse (bh);
 908
 909         UFSD("EXIT\n");
 910         return 0;
 911 }
 912
 913 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 914 {
 915         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 916 }
 917
 918 int ufs_sync_inode (struct inode *inode)
 919 {
 920         return ufs_update_inode (inode, 1);
 921 }
 922
 923 void ufs_evict_inode(struct inode * inode)
 924 {
 925         int want_delete = 0;
 926
 927         if (!inode->i_nlink && !is_bad_inode(inode))
 928                 want_delete = 1;
 929
 930         truncate_inode_pages_final(&inode->i_data);
 931         if (want_delete) {
 932                 inode->i_size = 0;
 933                 if (inode->i_blocks)
 934                         ufs_truncate_blocks(inode);
 935         }
 936
 937         invalidate_inode_buffers(inode);
 938         clear_inode(inode);
 939
 940         if (want_delete)
 941                 ufs_free_inode(inode);
 942 }
 943
 944 struct to_free {
 945         struct inode *inode;
 946         u64 to;
 947         unsigned count;
 948 };
 949
 950 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 951 {
 952         if (ctx->count && ctx->to != from) {
 953                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 954                 ctx->count = 0;
 955         }
 956         ctx->count += count;
 957         ctx->to = from + count;
 958 }
 959
 960 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 961 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 962
 963 static void ufs_trunc_direct(struct inode *inode)
 964 {
 965         struct ufs_inode_info *ufsi = UFS_I(inode);
 966         struct super_block * sb;
 967         struct ufs_sb_private_info * uspi;
 968         void *p;
 969         u64 frag1, frag2, frag3, frag4, block1, block2;
 970         struct to_free ctx = {.inode = inode};
 971         unsigned i, tmp;
 972
 973         UFSD("ENTER: ino %lu\n", inode->i_ino);
 974
 975         sb = inode->i_sb;
 976         uspi = UFS_SB(sb)->s_uspi;
 977
 978         frag1 = DIRECT_FRAGMENT;
 979         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 980         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 981         frag3 = frag4 & ~uspi->s_fpbmask;
 982         block1 = block2 = 0;
 983         if (frag2 > frag3) {
 984                 frag2 = frag4;
 985                 frag3 = frag4 = 0;
 986         } else if (frag2 < frag3) {
 987                 block1 = ufs_fragstoblks (frag2);
 988                 block2 = ufs_fragstoblks (frag3);
 989         }
 990
 991         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 992              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 993              (unsigned long long)frag1, (unsigned long long)frag2,
 994              (unsigned long long)block1, (unsigned long long)block2,
 995              (unsigned long long)frag3, (unsigned long long)frag4);
 996
 997         if (frag1 >= frag2)
 998                 goto next1;
 999
1000         /*
1001          * Free first free fragments
1002          */
1003         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
1004         tmp = ufs_data_ptr_to_cpu(sb, p);
1005         if (!tmp )
1006                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
1007         frag2 -= frag1;
1008         frag1 = ufs_fragnum (frag1);
1009
1010         ufs_free_fragments(inode, tmp + frag1, frag2);
1011
1012 next1:
1013         /*
1014          * Free whole blocks
1015          */
1016         for (i = block1 ; i < block2; i++) {
1017                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1018                 tmp = ufs_data_ptr_to_cpu(sb, p);
1019                 if (!tmp)
1020                         continue;
1021                 write_seqlock(&ufsi->meta_lock);
1022                 ufs_data_ptr_clear(uspi, p);
1023                 write_sequnlock(&ufsi->meta_lock);
1024
1025                 free_data(&ctx, tmp, uspi->s_fpb);
1026         }
1027
1028         free_data(&ctx, 0, 0);
1029
1030         if (frag3 >= frag4)
1031                 goto next3;
1032
1033         /*
1034          * Free last free fragments
1035          */
1036         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
1037         tmp = ufs_data_ptr_to_cpu(sb, p);
1038         if (!tmp )
1039                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
1040         frag4 = ufs_fragnum (frag4);
1041         write_seqlock(&ufsi->meta_lock);
1042         ufs_data_ptr_clear(uspi, p);
1043         write_sequnlock(&ufsi->meta_lock);
1044
1045         ufs_free_fragments (inode, tmp, frag4);
1046  next3:
1047
1048         UFSD("EXIT: ino %lu\n", inode->i_ino);
1049 }
1050
1051 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
1052 {
1053         struct super_block *sb = inode->i_sb;
1054         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1055         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
1056         unsigned i;
1057
1058         if (!ubh)
1059                 return;
1060
1061         if (--depth) {
1062                 for (i = 0; i < uspi->s_apb; i++) {
1063                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1064                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1065                         if (block)
1066                                 free_full_branch(inode, block, depth);
1067                 }
1068         } else {
1069                 struct to_free ctx = {.inode = inode};
1070
1071                 for (i = 0; i < uspi->s_apb; i++) {
1072                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1073                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1074                         if (block)
1075                                 free_data(&ctx, block, uspi->s_fpb);
1076                 }
1077                 free_data(&ctx, 0, 0);
1078         }
1079
1080         ubh_bforget(ubh);
1081         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1082 }
1083
1084 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1085 {
1086         struct super_block *sb = inode->i_sb;
1087         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1088         unsigned i;
1089
1090         if (--depth) {
1091                 for (i = from; i < uspi->s_apb ; i++) {
1092                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1093                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1094                         if (block) {
1095                                 write_seqlock(&UFS_I(inode)->meta_lock);
1096                                 ufs_data_ptr_clear(uspi, p);
1097                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1098                                 ubh_mark_buffer_dirty(ubh);
1099                                 free_full_branch(inode, block, depth);
1100                         }
1101                 }
1102         } else {
1103                 struct to_free ctx = {.inode = inode};
1104
1105                 for (i = from; i < uspi->s_apb; i++) {
1106                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1107                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1108                         if (block) {
1109                                 write_seqlock(&UFS_I(inode)->meta_lock);
1110                                 ufs_data_ptr_clear(uspi, p);
1111                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1112                                 ubh_mark_buffer_dirty(ubh);
1113                                 free_data(&ctx, block, uspi->s_fpb);
1114                         }
1115                 }
1116                 free_data(&ctx, 0, 0);
1117         }
1118         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1119                 ubh_sync_block(ubh);
1120         ubh_brelse(ubh);
1121 }
1122
1123 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1124 {
1125         int err = 0;
1126         struct super_block *sb = inode->i_sb;
1127         struct address_space *mapping = inode->i_mapping;
1128         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1129         unsigned i, end;
1130         sector_t lastfrag;
1131         struct page *lastpage;
1132         struct buffer_head *bh;
1133         u64 phys64;
1134
1135         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1136
1137         if (!lastfrag)
1138                 goto out;
1139
1140         lastfrag--;
1141
1142         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1143                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1144        if (IS_ERR(lastpage)) {
1145                err = -EIO;
1146                goto out;
1147        }
1148
1149        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1150        bh = page_buffers(lastpage);
1151        for (i = 0; i < end; ++i)
1152                bh = bh->b_this_page;
1153
1154
1155        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1156
1157        if (unlikely(err))
1158                goto out_unlock;
1159
1160        if (buffer_new(bh)) {
1161                clear_buffer_new(bh);
1162                unmap_underlying_metadata(bh->b_bdev,
1163                                          bh->b_blocknr);
1164                /*
1165                 * we do not zeroize fragment, because of
1166                 * if it maped to hole, it already contains zeroes
1167                 */
1168                set_buffer_uptodate(bh);
1169                mark_buffer_dirty(bh);
1170                set_page_dirty(lastpage);
1171        }
1172
1173        if (lastfrag >= UFS_IND_FRAGMENT) {
1174                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1175                phys64 = bh->b_blocknr + 1;
1176                for (i = 0; i < end; ++i) {
1177                        bh = sb_getblk(sb, i + phys64);
1178                        lock_buffer(bh);
1179                        memset(bh->b_data, 0, sb->s_blocksize);
1180                        set_buffer_uptodate(bh);
1181                        mark_buffer_dirty(bh);
1182                        unlock_buffer(bh);
1183                        sync_dirty_buffer(bh);
1184                        brelse(bh);
1185                }
1186        }
1187 out_unlock:
1188        ufs_put_locked_page(lastpage);
1189 out:
1190        return err;
1191 }
1192
1193 static void __ufs_truncate_blocks(struct inode *inode)
1194 {
1195         struct ufs_inode_info *ufsi = UFS_I(inode);
1196         struct super_block *sb = inode->i_sb;
1197         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1198         unsigned offsets[4];
1199         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1200         int depth2;
1201         unsigned i;
1202         struct ufs_buffer_head *ubh[3];
1203         void *p;
1204         u64 block;
1205
1206         if (!depth)
1207                 return;
1208
1209         /* find the last non-zero in offsets[] */
1210         for (depth2 = depth - 1; depth2; depth2--)
1211                 if (offsets[depth2])
1212                         break;
1213
1214         mutex_lock(&ufsi->truncate_mutex);
1215         if (depth == 1) {
1216                 ufs_trunc_direct(inode);
1217                 offsets[0] = UFS_IND_BLOCK;
1218         } else {
1219                 /* get the blocks that should be partially emptied */
1220                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1221                 for (i = 0; i < depth2; i++) {
1222                         offsets[i]++;   /* next branch is fully freed */
1223                         block = ufs_data_ptr_to_cpu(sb, p);
1224                         if (!block)
1225                                 break;
1226                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1227                         if (!ubh[i]) {
1228                                 write_seqlock(&ufsi->meta_lock);
1229                                 ufs_data_ptr_clear(uspi, p);
1230                                 write_sequnlock(&ufsi->meta_lock);
1231                                 break;
1232                         }
1233                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1234                 }
1235                 while (i--)
1236                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1237         }
1238         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1239                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1240                 block = ufs_data_ptr_to_cpu(sb, p);
1241                 if (block) {
1242                         write_seqlock(&ufsi->meta_lock);
1243                         ufs_data_ptr_clear(uspi, p);
1244                         write_sequnlock(&ufsi->meta_lock);
1245                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1246                 }
1247         }
1248         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1249         mark_inode_dirty(inode);
1250         mutex_unlock(&ufsi->truncate_mutex);
1251 }
1252
1253 static int ufs_truncate(struct inode *inode, loff_t size)
1254 {
1255         int err = 0;
1256
1257         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1258              inode->i_ino, (unsigned long long)size,
1259              (unsigned long long)i_size_read(inode));
1260
1261         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1262               S_ISLNK(inode->i_mode)))
1263                 return -EINVAL;
1264         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1265                 return -EPERM;
1266
1267         err = ufs_alloc_lastblock(inode, size);
1268
1269         if (err)
1270                 goto out;
1271
1272         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1273
1274         truncate_setsize(inode, size);
1275
1276         __ufs_truncate_blocks(inode);
1277         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1278         mark_inode_dirty(inode);
1279 out:
1280         UFSD("EXIT: err %d\n", err);
1281         return err;
1282 }
1283
1284 void ufs_truncate_blocks(struct inode *inode)
1285 {
1286         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1287               S_ISLNK(inode->i_mode)))
1288                 return;
1289         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1290                 return;
1291         __ufs_truncate_blocks(inode);
1292 }
1293
1294 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1295 {
1296         struct inode *inode = d_inode(dentry);
1297         unsigned int ia_valid = attr->ia_valid;
1298         int error;
1299
1300         error = inode_change_ok(inode, attr);
1301         if (error)
1302                 return error;
1303
1304         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1305                 error = ufs_truncate(inode, attr->ia_size);
1306                 if (error)
1307                         return error;
1308         }
1309
1310         setattr_copy(inode, attr);
1311         mark_inode_dirty(inode);
1312         return 0;
1313 }
1314
1315 const struct inode_operations ufs_file_inode_operations = {
1316         .setattr = ufs_setattr,
1317 };