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