fs/ufs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ufs/inode.c
   4  *
   5  * Copyright (C) 1998
   6  * Daniel Pirkl <daniel.pirkl@email.cz>
   7  * Charles University, Faculty of Mathematics and Physics
   8  *
   9  *  from
  10  *
  11  *  linux/fs/ext2/inode.c
  12  *
  13  * Copyright (C) 1992, 1993, 1994, 1995
  14  * Remy Card (card@masi.ibp.fr)
  15  * Laboratoire MASI - Institut Blaise Pascal
  16  * Universite Pierre et Marie Curie (Paris VI)
  17  *
  18  *  from
  19  *
  20  *  linux/fs/minix/inode.c
  21  *
  22  *  Copyright (C) 1991, 1992  Linus Torvalds
  23  *
  24  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  25  *  Big-endian to little-endian byte-swapping/bitmaps by
  26  *        David S. Miller (davem@caip.rutgers.edu), 1995
  27  */
  28
  29 #include <linux/uaccess.h>
  30
  31 #include <linux/errno.h>
  32 #include <linux/fs.h>
  33 #include <linux/time.h>
  34 #include <linux/stat.h>
  35 #include <linux/string.h>
  36 #include <linux/mm.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39 #include <linux/iversion.h>
  40
  41 #include "ufs_fs.h"
  42 #include "ufs.h"
  43 #include "swab.h"
  44 #include "util.h"
  45
  46 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  47 {
  48         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  49         int ptrs = uspi->s_apb;
  50         int ptrs_bits = uspi->s_apbshift;
  51         const long direct_blocks = UFS_NDADDR,
  52                 indirect_blocks = ptrs,
  53                 double_blocks = (1 << (ptrs_bits * 2));
  54         int n = 0;
  55
  56
  57         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  58         if (i_block < direct_blocks) {
  59                 offsets[n++] = i_block;
  60         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  61                 offsets[n++] = UFS_IND_BLOCK;
  62                 offsets[n++] = i_block;
  63         } else if ((i_block -= indirect_blocks) < double_blocks) {
  64                 offsets[n++] = UFS_DIND_BLOCK;
  65                 offsets[n++] = i_block >> ptrs_bits;
  66                 offsets[n++] = i_block & (ptrs - 1);
  67         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  68                 offsets[n++] = UFS_TIND_BLOCK;
  69                 offsets[n++] = i_block >> (ptrs_bits * 2);
  70                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  71                 offsets[n++] = i_block & (ptrs - 1);
  72         } else {
  73                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  74         }
  75         return n;
  76 }
  77
  78 typedef struct {
  79         void    *p;
  80         union {
  81                 __fs32  key32;
  82                 __fs64  key64;
  83         };
  84         struct buffer_head *bh;
  85 } Indirect;
  86
  87 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  88                                struct buffer_head *bh, __fs32 *v,
  89                                Indirect *from, Indirect *to)
  90 {
  91         Indirect *p;
  92         unsigned seq;
  93         to->bh = bh;
  94         do {
  95                 seq = read_seqbegin(&ufsi->meta_lock);
  96                 to->key32 = *(__fs32 *)(to->p = v);
  97                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  98                         ;
  99         } while (read_seqretry(&ufsi->meta_lock, seq));
 100         return (p > to);
 101 }
 102
 103 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 104                                struct buffer_head *bh, __fs64 *v,
 105                                Indirect *from, Indirect *to)
 106 {
 107         Indirect *p;
 108         unsigned seq;
 109         to->bh = bh;
 110         do {
 111                 seq = read_seqbegin(&ufsi->meta_lock);
 112                 to->key64 = *(__fs64 *)(to->p = v);
 113                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 114                         ;
 115         } while (read_seqretry(&ufsi->meta_lock, seq));
 116         return (p > to);
 117 }
 118
 119 /*
 120  * Returns the location of the fragment from
 121  * the beginning of the filesystem.
 122  */
 123
 124 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 125 {
 126         struct ufs_inode_info *ufsi = UFS_I(inode);
 127         struct super_block *sb = inode->i_sb;
 128         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 129         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 130         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 131         Indirect chain[4], *q = chain;
 132         unsigned *p;
 133         unsigned flags = UFS_SB(sb)->s_flags;
 134         u64 res = 0;
 135
 136         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 137                 uspi->s_fpbshift, uspi->s_apbmask,
 138                 (unsigned long long)mask);
 139
 140         if (depth == 0)
 141                 goto no_block;
 142
 143 again:
 144         p = offsets;
 145
 146         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 147                 goto ufs2;
 148
 149         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 150                 goto changed;
 151         if (!q->key32)
 152                 goto no_block;
 153         while (--depth) {
 154                 __fs32 *ptr;
 155                 struct buffer_head *bh;
 156                 unsigned n = *p++;
 157
 158                 bh = sb_bread(sb, uspi->s_sbbase +
 159                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 160                 if (!bh)
 161                         goto no_block;
 162                 ptr = (__fs32 *)bh->b_data + (n & mask);
 163                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 164                         goto changed;
 165                 if (!q->key32)
 166                         goto no_block;
 167         }
 168         res = fs32_to_cpu(sb, q->key32);
 169         goto found;
 170
 171 ufs2:
 172         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 173                 goto changed;
 174         if (!q->key64)
 175                 goto no_block;
 176
 177         while (--depth) {
 178                 __fs64 *ptr;
 179                 struct buffer_head *bh;
 180                 unsigned n = *p++;
 181
 182                 bh = sb_bread(sb, uspi->s_sbbase +
 183                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 184                 if (!bh)
 185                         goto no_block;
 186                 ptr = (__fs64 *)bh->b_data + (n & mask);
 187                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 188                         goto changed;
 189                 if (!q->key64)
 190                         goto no_block;
 191         }
 192         res = fs64_to_cpu(sb, q->key64);
 193 found:
 194         res += uspi->s_sbbase;
 195 no_block:
 196         while (q > chain) {
 197                 brelse(q->bh);
 198                 q--;
 199         }
 200         return res;
 201
 202 changed:
 203         while (q > chain) {
 204                 brelse(q->bh);
 205                 q--;
 206         }
 207         goto again;
 208 }
 209
 210 /*
 211  * Unpacking tails: we have a file with partial final block and
 212  * we had been asked to extend it.  If the fragment being written
 213  * is within the same block, we need to extend the tail just to cover
 214  * that fragment.  Otherwise the tail is extended to full block.
 215  *
 216  * Note that we might need to create a _new_ tail, but that will
 217  * be handled elsewhere; this is strictly for resizing old
 218  * ones.
 219  */
 220 static bool
 221 ufs_extend_tail(struct inode *inode, u64 writes_to,
 222                   int *err, struct page *locked_page)
 223 {
 224         struct ufs_inode_info *ufsi = UFS_I(inode);
 225         struct super_block *sb = inode->i_sb;
 226         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 227         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 228         unsigned block = ufs_fragstoblks(lastfrag);
 229         unsigned new_size;
 230         void *p;
 231         u64 tmp;
 232
 233         if (writes_to < (lastfrag | uspi->s_fpbmask))
 234                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 235         else
 236                 new_size = uspi->s_fpb;
 237
 238         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 239         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 240                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 241                                 locked_page);
 242         return tmp != 0;
 243 }
 244
 245 /**
 246  * ufs_inode_getfrag() - allocate new fragment(s)
 247  * @inode: pointer to inode
 248  * @index: number of block pointer within the inode's array.
 249  * @new_fragment: number of new allocated fragment(s)
 250  * @err: we set it if something wrong
 251  * @new: we set it if we allocate new block
 252  * @locked_page: for ufs_new_fragments()
 253  */
 254 static u64
 255 ufs_inode_getfrag(struct inode *inode, unsigned index,
 256                   sector_t new_fragment, int *err,
 257                   int *new, struct page *locked_page)
 258 {
 259         struct ufs_inode_info *ufsi = UFS_I(inode);
 260         struct super_block *sb = inode->i_sb;
 261         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 262         u64 tmp, goal, lastfrag;
 263         unsigned nfrags = uspi->s_fpb;
 264         void *p;
 265
 266         /* TODO : to be done for write support
 267         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 268              goto ufs2;
 269          */
 270
 271         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 272         tmp = ufs_data_ptr_to_cpu(sb, p);
 273         if (tmp)
 274                 goto out;
 275
 276         lastfrag = ufsi->i_lastfrag;
 277
 278         /* will that be a new tail? */
 279         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 280                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 281
 282         goal = 0;
 283         if (index) {
 284                 goal = ufs_data_ptr_to_cpu(sb,
 285                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 286                 if (goal)
 287                         goal += uspi->s_fpb;
 288         }
 289         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 290                                 goal, nfrags, err, locked_page);
 291
 292         if (!tmp) {
 293                 *err = -ENOSPC;
 294                 return 0;
 295         }
 296
 297         if (new)
 298                 *new = 1;
 299         inode->i_ctime = current_time(inode);
 300         if (IS_SYNC(inode))
 301                 ufs_sync_inode (inode);
 302         mark_inode_dirty(inode);
 303 out:
 304         return tmp + uspi->s_sbbase;
 305
 306      /* This part : To be implemented ....
 307         Required only for writing, not required for READ-ONLY.
 308 ufs2:
 309
 310         u2_block = ufs_fragstoblks(fragment);
 311         u2_blockoff = ufs_fragnum(fragment);
 312         p = ufsi->i_u1.u2_i_data + block;
 313         goal = 0;
 314
 315 repeat2:
 316         tmp = fs32_to_cpu(sb, *p);
 317         lastfrag = ufsi->i_lastfrag;
 318
 319      */
 320 }
 321
 322 /**
 323  * ufs_inode_getblock() - allocate new block
 324  * @inode: pointer to inode
 325  * @ind_block: block number of the indirect block
 326  * @index: number of pointer within the indirect block
 327  * @new_fragment: number of new allocated fragment
 328  *  (block will hold this fragment and also uspi->s_fpb-1)
 329  * @err: see ufs_inode_getfrag()
 330  * @new: see ufs_inode_getfrag()
 331  * @locked_page: see ufs_inode_getfrag()
 332  */
 333 static u64
 334 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 335                   unsigned index, sector_t new_fragment, int *err,
 336                   int *new, struct page *locked_page)
 337 {
 338         struct super_block *sb = inode->i_sb;
 339         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 340         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 341         u64 tmp = 0, goal;
 342         struct buffer_head *bh;
 343         void *p;
 344
 345         if (!ind_block)
 346                 return 0;
 347
 348         bh = sb_bread(sb, ind_block + (index >> shift));
 349         if (unlikely(!bh)) {
 350                 *err = -EIO;
 351                 return 0;
 352         }
 353
 354         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 355         if (uspi->fs_magic == UFS2_MAGIC)
 356                 p = (__fs64 *)bh->b_data + index;
 357         else
 358                 p = (__fs32 *)bh->b_data + index;
 359
 360         tmp = ufs_data_ptr_to_cpu(sb, p);
 361         if (tmp)
 362                 goto out;
 363
 364         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 365                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 366                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 367                 goal = tmp + uspi->s_fpb;
 368         else
 369                 goal = bh->b_blocknr + uspi->s_fpb;
 370         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 371                                 uspi->s_fpb, err, locked_page);
 372         if (!tmp)
 373                 goto out;
 374
 375         if (new)
 376                 *new = 1;
 377
 378         mark_buffer_dirty(bh);
 379         if (IS_SYNC(inode))
 380                 sync_dirty_buffer(bh);
 381         inode->i_ctime = current_time(inode);
 382         mark_inode_dirty(inode);
 383 out:
 384         brelse (bh);
 385         UFSD("EXIT\n");
 386         if (tmp)
 387                 tmp += uspi->s_sbbase;
 388         return tmp;
 389 }
 390
 391 /**
 392  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 393  * readpage, writepage and so on
 394  */
 395
 396 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 397 {
 398         struct super_block *sb = inode->i_sb;
 399         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 400         int err = 0, new = 0;
 401         unsigned offsets[4];
 402         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 403         u64 phys64 = 0;
 404         unsigned frag = fragment & uspi->s_fpbmask;
 405
 406         phys64 = ufs_frag_map(inode, offsets, depth);
 407         if (!create)
 408                 goto done;
 409
 410         if (phys64) {
 411                 if (fragment >= UFS_NDIR_FRAGMENT)
 412                         goto done;
 413                 read_seqlock_excl(&UFS_I(inode)->meta_lock);
 414                 if (fragment < UFS_I(inode)->i_lastfrag) {
 415                         read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 416                         goto done;
 417                 }
 418                 read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 419         }
 420         /* This code entered only while writing ....? */
 421
 422         mutex_lock(&UFS_I(inode)->truncate_mutex);
 423
 424         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 425         if (unlikely(!depth)) {
 426                 ufs_warning(sb, "ufs_get_block", "block > big");
 427                 err = -EIO;
 428                 goto out;
 429         }
 430
 431         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 432                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 433                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 434                 if (tailfrags && fragment >= lastfrag) {
 435                         if (!ufs_extend_tail(inode, fragment,
 436                                              &err, bh_result->b_page))
 437                                 goto out;
 438                 }
 439         }
 440
 441         if (depth == 1) {
 442                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 443                                            &err, &new, bh_result->b_page);
 444         } else {
 445                 int i;
 446                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 447                                            &err, NULL, NULL);
 448                 for (i = 1; i < depth - 1; i++)
 449                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 450                                                 fragment, &err, NULL, NULL);
 451                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 452                                         fragment, &err, &new, bh_result->b_page);
 453         }
 454 out:
 455         if (phys64) {
 456                 phys64 += frag;
 457                 map_bh(bh_result, sb, phys64);
 458                 if (new)
 459                         set_buffer_new(bh_result);
 460         }
 461         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 462         return err;
 463
 464 done:
 465         if (phys64)
 466                 map_bh(bh_result, sb, phys64 + frag);
 467         return 0;
 468 }
 469
 470 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 471 {
 472         return block_write_full_page(page,ufs_getfrag_block,wbc);
 473 }
 474
 475 static int ufs_readpage(struct file *file, struct page *page)
 476 {
 477         return block_read_full_page(page,ufs_getfrag_block);
 478 }
 479
 480 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 481 {
 482         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 483 }
 484
 485 static void ufs_truncate_blocks(struct inode *);
 486
 487 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 488 {
 489         struct inode *inode = mapping->host;
 490
 491         if (to > inode->i_size) {
 492                 truncate_pagecache(inode, inode->i_size);
 493                 ufs_truncate_blocks(inode);
 494         }
 495 }
 496
 497 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 498                         loff_t pos, unsigned len, unsigned flags,
 499                         struct page **pagep, void **fsdata)
 500 {
 501         int ret;
 502
 503         ret = block_write_begin(mapping, pos, len, flags, pagep,
 504                                 ufs_getfrag_block);
 505         if (unlikely(ret))
 506                 ufs_write_failed(mapping, pos + len);
 507
 508         return ret;
 509 }
 510
 511 static int ufs_write_end(struct file *file, struct address_space *mapping,
 512                         loff_t pos, unsigned len, unsigned copied,
 513                         struct page *page, void *fsdata)
 514 {
 515         int ret;
 516
 517         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 518         if (ret < len)
 519                 ufs_write_failed(mapping, pos + len);
 520         return ret;
 521 }
 522
 523 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 524 {
 525         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 526 }
 527
 528 const struct address_space_operations ufs_aops = {
 529         .dirty_folio = block_dirty_folio,
 530         .invalidate_folio = block_invalidate_folio,
 531         .readpage = ufs_readpage,
 532         .writepage = ufs_writepage,
 533         .write_begin = ufs_write_begin,
 534         .write_end = ufs_write_end,
 535         .bmap = ufs_bmap
 536 };
 537
 538 static void ufs_set_inode_ops(struct inode *inode)
 539 {
 540         if (S_ISREG(inode->i_mode)) {
 541                 inode->i_op = &ufs_file_inode_operations;
 542                 inode->i_fop = &ufs_file_operations;
 543                 inode->i_mapping->a_ops = &ufs_aops;
 544         } else if (S_ISDIR(inode->i_mode)) {
 545                 inode->i_op = &ufs_dir_inode_operations;
 546                 inode->i_fop = &ufs_dir_operations;
 547                 inode->i_mapping->a_ops = &ufs_aops;
 548         } else if (S_ISLNK(inode->i_mode)) {
 549                 if (!inode->i_blocks) {
 550                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 551                         inode->i_op = &simple_symlink_inode_operations;
 552                 } else {
 553                         inode->i_mapping->a_ops = &ufs_aops;
 554                         inode->i_op = &page_symlink_inode_operations;
 555                         inode_nohighmem(inode);
 556                 }
 557         } else
 558                 init_special_inode(inode, inode->i_mode,
 559                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 560 }
 561
 562 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 563 {
 564         struct ufs_inode_info *ufsi = UFS_I(inode);
 565         struct super_block *sb = inode->i_sb;
 566         umode_t mode;
 567
 568         /*
 569          * Copy data to the in-core inode.
 570          */
 571         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 572         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 573         if (inode->i_nlink == 0)
 574                 return -ESTALE;
 575
 576         /*
 577          * Linux now has 32-bit uid and gid, so we can support EFT.
 578          */
 579         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 580         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 581
 582         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 583         inode->i_atime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 584         inode->i_ctime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 585         inode->i_mtime.tv_sec = (signed)fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 586         inode->i_mtime.tv_nsec = 0;
 587         inode->i_atime.tv_nsec = 0;
 588         inode->i_ctime.tv_nsec = 0;
 589         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 590         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 591         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 592         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 593         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 594
 595
 596         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 597                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 598                        sizeof(ufs_inode->ui_u2.ui_addr));
 599         } else {
 600                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 601                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 602                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 603         }
 604         return 0;
 605 }
 606
 607 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 608 {
 609         struct ufs_inode_info *ufsi = UFS_I(inode);
 610         struct super_block *sb = inode->i_sb;
 611         umode_t mode;
 612
 613         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 614         /*
 615          * Copy data to the in-core inode.
 616          */
 617         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 618         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 619         if (inode->i_nlink == 0)
 620                 return -ESTALE;
 621
 622         /*
 623          * Linux now has 32-bit uid and gid, so we can support EFT.
 624          */
 625         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 626         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 627
 628         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 629         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 630         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 631         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 632         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 633         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 634         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 635         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 636         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 637         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 638         /*
 639         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 640         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 641         */
 642
 643         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 644                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 645                        sizeof(ufs2_inode->ui_u2.ui_addr));
 646         } else {
 647                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 648                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 649                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 650         }
 651         return 0;
 652 }
 653
 654 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 655 {
 656         struct ufs_inode_info *ufsi;
 657         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 658         struct buffer_head * bh;
 659         struct inode *inode;
 660         int err = -EIO;
 661
 662         UFSD("ENTER, ino %lu\n", ino);
 663
 664         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 665                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 666                             ino);
 667                 return ERR_PTR(-EIO);
 668         }
 669
 670         inode = iget_locked(sb, ino);
 671         if (!inode)
 672                 return ERR_PTR(-ENOMEM);
 673         if (!(inode->i_state & I_NEW))
 674                 return inode;
 675
 676         ufsi = UFS_I(inode);
 677
 678         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 679         if (!bh) {
 680                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 681                             inode->i_ino);
 682                 goto bad_inode;
 683         }
 684         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 685                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 686
 687                 err = ufs2_read_inode(inode,
 688                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 689         } else {
 690                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 691
 692                 err = ufs1_read_inode(inode,
 693                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 694         }
 695         brelse(bh);
 696         if (err)
 697                 goto bad_inode;
 698
 699         inode_inc_iversion(inode);
 700         ufsi->i_lastfrag =
 701                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 702         ufsi->i_dir_start_lookup = 0;
 703         ufsi->i_osync = 0;
 704
 705         ufs_set_inode_ops(inode);
 706
 707         UFSD("EXIT\n");
 708         unlock_new_inode(inode);
 709         return inode;
 710
 711 bad_inode:
 712         iget_failed(inode);
 713         return ERR_PTR(err);
 714 }
 715
 716 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 717 {
 718         struct super_block *sb = inode->i_sb;
 719         struct ufs_inode_info *ufsi = UFS_I(inode);
 720
 721         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 722         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 723
 724         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 725         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 726
 727         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 728         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 729         ufs_inode->ui_atime.tv_usec = 0;
 730         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 731         ufs_inode->ui_ctime.tv_usec = 0;
 732         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 733         ufs_inode->ui_mtime.tv_usec = 0;
 734         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 735         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 736         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 737
 738         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 739                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 740                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 741         }
 742
 743         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 744                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 745                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 746         } else if (inode->i_blocks) {
 747                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 748                        sizeof(ufs_inode->ui_u2.ui_addr));
 749         }
 750         else {
 751                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 752                        sizeof(ufs_inode->ui_u2.ui_symlink));
 753         }
 754
 755         if (!inode->i_nlink)
 756                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 757 }
 758
 759 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 760 {
 761         struct super_block *sb = inode->i_sb;
 762         struct ufs_inode_info *ufsi = UFS_I(inode);
 763
 764         UFSD("ENTER\n");
 765         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 766         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 767
 768         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 769         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 770
 771         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 772         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 773         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 774         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 775         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 776         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 777         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 778
 779         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 780         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 781         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 782
 783         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 784                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 785                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 786         } else if (inode->i_blocks) {
 787                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 788                        sizeof(ufs_inode->ui_u2.ui_addr));
 789         } else {
 790                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 791                        sizeof(ufs_inode->ui_u2.ui_symlink));
 792         }
 793
 794         if (!inode->i_nlink)
 795                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 796         UFSD("EXIT\n");
 797 }
 798
 799 static int ufs_update_inode(struct inode * inode, int do_sync)
 800 {
 801         struct super_block *sb = inode->i_sb;
 802         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 803         struct buffer_head * bh;
 804
 805         UFSD("ENTER, ino %lu\n", inode->i_ino);
 806
 807         if (inode->i_ino < UFS_ROOTINO ||
 808             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 809                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 810                 return -1;
 811         }
 812
 813         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 814         if (!bh) {
 815                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 816                 return -1;
 817         }
 818         if (uspi->fs_magic == UFS2_MAGIC) {
 819                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 820
 821                 ufs2_update_inode(inode,
 822                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 823         } else {
 824                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 825
 826                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 827         }
 828
 829         mark_buffer_dirty(bh);
 830         if (do_sync)
 831                 sync_dirty_buffer(bh);
 832         brelse (bh);
 833
 834         UFSD("EXIT\n");
 835         return 0;
 836 }
 837
 838 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 839 {
 840         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 841 }
 842
 843 int ufs_sync_inode (struct inode *inode)
 844 {
 845         return ufs_update_inode (inode, 1);
 846 }
 847
 848 void ufs_evict_inode(struct inode * inode)
 849 {
 850         int want_delete = 0;
 851
 852         if (!inode->i_nlink && !is_bad_inode(inode))
 853                 want_delete = 1;
 854
 855         truncate_inode_pages_final(&inode->i_data);
 856         if (want_delete) {
 857                 inode->i_size = 0;
 858                 if (inode->i_blocks &&
 859                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 860                      S_ISLNK(inode->i_mode)))
 861                         ufs_truncate_blocks(inode);
 862                 ufs_update_inode(inode, inode_needs_sync(inode));
 863         }
 864
 865         invalidate_inode_buffers(inode);
 866         clear_inode(inode);
 867
 868         if (want_delete)
 869                 ufs_free_inode(inode);
 870 }
 871
 872 struct to_free {
 873         struct inode *inode;
 874         u64 to;
 875         unsigned count;
 876 };
 877
 878 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 879 {
 880         if (ctx->count && ctx->to != from) {
 881                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 882                 ctx->count = 0;
 883         }
 884         ctx->count += count;
 885         ctx->to = from + count;
 886 }
 887
 888 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 889
 890 static void ufs_trunc_direct(struct inode *inode)
 891 {
 892         struct ufs_inode_info *ufsi = UFS_I(inode);
 893         struct super_block * sb;
 894         struct ufs_sb_private_info * uspi;
 895         void *p;
 896         u64 frag1, frag2, frag3, frag4, block1, block2;
 897         struct to_free ctx = {.inode = inode};
 898         unsigned i, tmp;
 899
 900         UFSD("ENTER: ino %lu\n", inode->i_ino);
 901
 902         sb = inode->i_sb;
 903         uspi = UFS_SB(sb)->s_uspi;
 904
 905         frag1 = DIRECT_FRAGMENT;
 906         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 907         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 908         frag3 = frag4 & ~uspi->s_fpbmask;
 909         block1 = block2 = 0;
 910         if (frag2 > frag3) {
 911                 frag2 = frag4;
 912                 frag3 = frag4 = 0;
 913         } else if (frag2 < frag3) {
 914                 block1 = ufs_fragstoblks (frag2);
 915                 block2 = ufs_fragstoblks (frag3);
 916         }
 917
 918         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 919              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 920              (unsigned long long)frag1, (unsigned long long)frag2,
 921              (unsigned long long)block1, (unsigned long long)block2,
 922              (unsigned long long)frag3, (unsigned long long)frag4);
 923
 924         if (frag1 >= frag2)
 925                 goto next1;
 926
 927         /*
 928          * Free first free fragments
 929          */
 930         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 931         tmp = ufs_data_ptr_to_cpu(sb, p);
 932         if (!tmp )
 933                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 934         frag2 -= frag1;
 935         frag1 = ufs_fragnum (frag1);
 936
 937         ufs_free_fragments(inode, tmp + frag1, frag2);
 938
 939 next1:
 940         /*
 941          * Free whole blocks
 942          */
 943         for (i = block1 ; i < block2; i++) {
 944                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 945                 tmp = ufs_data_ptr_to_cpu(sb, p);
 946                 if (!tmp)
 947                         continue;
 948                 write_seqlock(&ufsi->meta_lock);
 949                 ufs_data_ptr_clear(uspi, p);
 950                 write_sequnlock(&ufsi->meta_lock);
 951
 952                 free_data(&ctx, tmp, uspi->s_fpb);
 953         }
 954
 955         free_data(&ctx, 0, 0);
 956
 957         if (frag3 >= frag4)
 958                 goto next3;
 959
 960         /*
 961          * Free last free fragments
 962          */
 963         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 964         tmp = ufs_data_ptr_to_cpu(sb, p);
 965         if (!tmp )
 966                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 967         frag4 = ufs_fragnum (frag4);
 968         write_seqlock(&ufsi->meta_lock);
 969         ufs_data_ptr_clear(uspi, p);
 970         write_sequnlock(&ufsi->meta_lock);
 971
 972         ufs_free_fragments (inode, tmp, frag4);
 973  next3:
 974
 975         UFSD("EXIT: ino %lu\n", inode->i_ino);
 976 }
 977
 978 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 979 {
 980         struct super_block *sb = inode->i_sb;
 981         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 982         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 983         unsigned i;
 984
 985         if (!ubh)
 986                 return;
 987
 988         if (--depth) {
 989                 for (i = 0; i < uspi->s_apb; i++) {
 990                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 991                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 992                         if (block)
 993                                 free_full_branch(inode, block, depth);
 994                 }
 995         } else {
 996                 struct to_free ctx = {.inode = inode};
 997
 998                 for (i = 0; i < uspi->s_apb; i++) {
 999                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1000                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1001                         if (block)
1002                                 free_data(&ctx, block, uspi->s_fpb);
1003                 }
1004                 free_data(&ctx, 0, 0);
1005         }
1006
1007         ubh_bforget(ubh);
1008         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1009 }
1010
1011 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1012 {
1013         struct super_block *sb = inode->i_sb;
1014         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1015         unsigned i;
1016
1017         if (--depth) {
1018                 for (i = from; i < uspi->s_apb ; i++) {
1019                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1020                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1021                         if (block) {
1022                                 write_seqlock(&UFS_I(inode)->meta_lock);
1023                                 ufs_data_ptr_clear(uspi, p);
1024                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1025                                 ubh_mark_buffer_dirty(ubh);
1026                                 free_full_branch(inode, block, depth);
1027                         }
1028                 }
1029         } else {
1030                 struct to_free ctx = {.inode = inode};
1031
1032                 for (i = from; i < uspi->s_apb; i++) {
1033                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1034                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1035                         if (block) {
1036                                 write_seqlock(&UFS_I(inode)->meta_lock);
1037                                 ufs_data_ptr_clear(uspi, p);
1038                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1039                                 ubh_mark_buffer_dirty(ubh);
1040                                 free_data(&ctx, block, uspi->s_fpb);
1041                         }
1042                 }
1043                 free_data(&ctx, 0, 0);
1044         }
1045         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1046                 ubh_sync_block(ubh);
1047         ubh_brelse(ubh);
1048 }
1049
1050 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1051 {
1052         int err = 0;
1053         struct super_block *sb = inode->i_sb;
1054         struct address_space *mapping = inode->i_mapping;
1055         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1056         unsigned i, end;
1057         sector_t lastfrag;
1058         struct page *lastpage;
1059         struct buffer_head *bh;
1060         u64 phys64;
1061
1062         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1063
1064         if (!lastfrag)
1065                 goto out;
1066
1067         lastfrag--;
1068
1069         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1070                                        (PAGE_SHIFT - inode->i_blkbits));
1071        if (IS_ERR(lastpage)) {
1072                err = -EIO;
1073                goto out;
1074        }
1075
1076        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1077        bh = page_buffers(lastpage);
1078        for (i = 0; i < end; ++i)
1079                bh = bh->b_this_page;
1080
1081
1082        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1083
1084        if (unlikely(err))
1085                goto out_unlock;
1086
1087        if (buffer_new(bh)) {
1088                clear_buffer_new(bh);
1089                clean_bdev_bh_alias(bh);
1090                /*
1091                 * we do not zeroize fragment, because of
1092                 * if it maped to hole, it already contains zeroes
1093                 */
1094                set_buffer_uptodate(bh);
1095                mark_buffer_dirty(bh);
1096                set_page_dirty(lastpage);
1097        }
1098
1099        if (lastfrag >= UFS_IND_FRAGMENT) {
1100                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1101                phys64 = bh->b_blocknr + 1;
1102                for (i = 0; i < end; ++i) {
1103                        bh = sb_getblk(sb, i + phys64);
1104                        lock_buffer(bh);
1105                        memset(bh->b_data, 0, sb->s_blocksize);
1106                        set_buffer_uptodate(bh);
1107                        mark_buffer_dirty(bh);
1108                        unlock_buffer(bh);
1109                        sync_dirty_buffer(bh);
1110                        brelse(bh);
1111                }
1112        }
1113 out_unlock:
1114        ufs_put_locked_page(lastpage);
1115 out:
1116        return err;
1117 }
1118
1119 static void ufs_truncate_blocks(struct inode *inode)
1120 {
1121         struct ufs_inode_info *ufsi = UFS_I(inode);
1122         struct super_block *sb = inode->i_sb;
1123         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1124         unsigned offsets[4];
1125         int depth;
1126         int depth2;
1127         unsigned i;
1128         struct ufs_buffer_head *ubh[3];
1129         void *p;
1130         u64 block;
1131
1132         if (inode->i_size) {
1133                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1134                 depth = ufs_block_to_path(inode, last, offsets);
1135                 if (!depth)
1136                         return;
1137         } else {
1138                 depth = 1;
1139         }
1140
1141         for (depth2 = depth - 1; depth2; depth2--)
1142                 if (offsets[depth2] != uspi->s_apb - 1)
1143                         break;
1144
1145         mutex_lock(&ufsi->truncate_mutex);
1146         if (depth == 1) {
1147                 ufs_trunc_direct(inode);
1148                 offsets[0] = UFS_IND_BLOCK;
1149         } else {
1150                 /* get the blocks that should be partially emptied */
1151                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1152                 for (i = 0; i < depth2; i++) {
1153                         block = ufs_data_ptr_to_cpu(sb, p);
1154                         if (!block)
1155                                 break;
1156                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1157                         if (!ubh[i]) {
1158                                 write_seqlock(&ufsi->meta_lock);
1159                                 ufs_data_ptr_clear(uspi, p);
1160                                 write_sequnlock(&ufsi->meta_lock);
1161                                 break;
1162                         }
1163                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1164                 }
1165                 while (i--)
1166                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1167         }
1168         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1169                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1170                 block = ufs_data_ptr_to_cpu(sb, p);
1171                 if (block) {
1172                         write_seqlock(&ufsi->meta_lock);
1173                         ufs_data_ptr_clear(uspi, p);
1174                         write_sequnlock(&ufsi->meta_lock);
1175                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1176                 }
1177         }
1178         read_seqlock_excl(&ufsi->meta_lock);
1179         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1180         read_sequnlock_excl(&ufsi->meta_lock);
1181         mark_inode_dirty(inode);
1182         mutex_unlock(&ufsi->truncate_mutex);
1183 }
1184
1185 static int ufs_truncate(struct inode *inode, loff_t size)
1186 {
1187         int err = 0;
1188
1189         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1190              inode->i_ino, (unsigned long long)size,
1191              (unsigned long long)i_size_read(inode));
1192
1193         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1194               S_ISLNK(inode->i_mode)))
1195                 return -EINVAL;
1196         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1197                 return -EPERM;
1198
1199         err = ufs_alloc_lastblock(inode, size);
1200
1201         if (err)
1202                 goto out;
1203
1204         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1205
1206         truncate_setsize(inode, size);
1207
1208         ufs_truncate_blocks(inode);
1209         inode->i_mtime = inode->i_ctime = current_time(inode);
1210         mark_inode_dirty(inode);
1211 out:
1212         UFSD("EXIT: err %d\n", err);
1213         return err;
1214 }
1215
1216 int ufs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
1217                 struct iattr *attr)
1218 {
1219         struct inode *inode = d_inode(dentry);
1220         unsigned int ia_valid = attr->ia_valid;
1221         int error;
1222
1223         error = setattr_prepare(&init_user_ns, dentry, attr);
1224         if (error)
1225                 return error;
1226
1227         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1228                 error = ufs_truncate(inode, attr->ia_size);
1229                 if (error)
1230                         return error;
1231         }
1232
1233         setattr_copy(&init_user_ns, inode, attr);
1234         mark_inode_dirty(inode);
1235         return 0;
1236 }
1237
1238 const struct inode_operations ufs_file_inode_operations = {
1239         .setattr = ufs_setattr,
1240 };