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/mpage.h>
  39 #include <linux/writeback.h>
  40 #include <linux/iversion.h>
  41
  42 #include "ufs_fs.h"
  43 #include "ufs.h"
  44 #include "swab.h"
  45 #include "util.h"
  46
  47 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  48 {
  49         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  50         int ptrs = uspi->s_apb;
  51         int ptrs_bits = uspi->s_apbshift;
  52         const long direct_blocks = UFS_NDADDR,
  53                 indirect_blocks = ptrs,
  54                 double_blocks = (1 << (ptrs_bits * 2));
  55         int n = 0;
  56
  57
  58         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  59         if (i_block < direct_blocks) {
  60                 offsets[n++] = i_block;
  61         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  62                 offsets[n++] = UFS_IND_BLOCK;
  63                 offsets[n++] = i_block;
  64         } else if ((i_block -= indirect_blocks) < double_blocks) {
  65                 offsets[n++] = UFS_DIND_BLOCK;
  66                 offsets[n++] = i_block >> ptrs_bits;
  67                 offsets[n++] = i_block & (ptrs - 1);
  68         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  69                 offsets[n++] = UFS_TIND_BLOCK;
  70                 offsets[n++] = i_block >> (ptrs_bits * 2);
  71                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  72                 offsets[n++] = i_block & (ptrs - 1);
  73         } else {
  74                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  75         }
  76         return n;
  77 }
  78
  79 typedef struct {
  80         void    *p;
  81         union {
  82                 __fs32  key32;
  83                 __fs64  key64;
  84         };
  85         struct buffer_head *bh;
  86 } Indirect;
  87
  88 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  89                                struct buffer_head *bh, __fs32 *v,
  90                                Indirect *from, Indirect *to)
  91 {
  92         Indirect *p;
  93         unsigned seq;
  94         to->bh = bh;
  95         do {
  96                 seq = read_seqbegin(&ufsi->meta_lock);
  97                 to->key32 = *(__fs32 *)(to->p = v);
  98                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  99                         ;
 100         } while (read_seqretry(&ufsi->meta_lock, seq));
 101         return (p > to);
 102 }
 103
 104 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 105                                struct buffer_head *bh, __fs64 *v,
 106                                Indirect *from, Indirect *to)
 107 {
 108         Indirect *p;
 109         unsigned seq;
 110         to->bh = bh;
 111         do {
 112                 seq = read_seqbegin(&ufsi->meta_lock);
 113                 to->key64 = *(__fs64 *)(to->p = v);
 114                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 115                         ;
 116         } while (read_seqretry(&ufsi->meta_lock, seq));
 117         return (p > to);
 118 }
 119
 120 /*
 121  * Returns the location of the fragment from
 122  * the beginning of the filesystem.
 123  */
 124
 125 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 126 {
 127         struct ufs_inode_info *ufsi = UFS_I(inode);
 128         struct super_block *sb = inode->i_sb;
 129         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 130         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 131         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 132         Indirect chain[4], *q = chain;
 133         unsigned *p;
 134         unsigned flags = UFS_SB(sb)->s_flags;
 135         u64 res = 0;
 136
 137         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 138                 uspi->s_fpbshift, uspi->s_apbmask,
 139                 (unsigned long long)mask);
 140
 141         if (depth == 0)
 142                 goto no_block;
 143
 144 again:
 145         p = offsets;
 146
 147         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 148                 goto ufs2;
 149
 150         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 151                 goto changed;
 152         if (!q->key32)
 153                 goto no_block;
 154         while (--depth) {
 155                 __fs32 *ptr;
 156                 struct buffer_head *bh;
 157                 unsigned n = *p++;
 158
 159                 bh = sb_bread(sb, uspi->s_sbbase +
 160                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 161                 if (!bh)
 162                         goto no_block;
 163                 ptr = (__fs32 *)bh->b_data + (n & mask);
 164                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 165                         goto changed;
 166                 if (!q->key32)
 167                         goto no_block;
 168         }
 169         res = fs32_to_cpu(sb, q->key32);
 170         goto found;
 171
 172 ufs2:
 173         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 174                 goto changed;
 175         if (!q->key64)
 176                 goto no_block;
 177
 178         while (--depth) {
 179                 __fs64 *ptr;
 180                 struct buffer_head *bh;
 181                 unsigned n = *p++;
 182
 183                 bh = sb_bread(sb, uspi->s_sbbase +
 184                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 185                 if (!bh)
 186                         goto no_block;
 187                 ptr = (__fs64 *)bh->b_data + (n & mask);
 188                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 189                         goto changed;
 190                 if (!q->key64)
 191                         goto no_block;
 192         }
 193         res = fs64_to_cpu(sb, q->key64);
 194 found:
 195         res += uspi->s_sbbase;
 196 no_block:
 197         while (q > chain) {
 198                 brelse(q->bh);
 199                 q--;
 200         }
 201         return res;
 202
 203 changed:
 204         while (q > chain) {
 205                 brelse(q->bh);
 206                 q--;
 207         }
 208         goto again;
 209 }
 210
 211 /*
 212  * Unpacking tails: we have a file with partial final block and
 213  * we had been asked to extend it.  If the fragment being written
 214  * is within the same block, we need to extend the tail just to cover
 215  * that fragment.  Otherwise the tail is extended to full block.
 216  *
 217  * Note that we might need to create a _new_ tail, but that will
 218  * be handled elsewhere; this is strictly for resizing old
 219  * ones.
 220  */
 221 static bool
 222 ufs_extend_tail(struct inode *inode, u64 writes_to,
 223                   int *err, struct page *locked_page)
 224 {
 225         struct ufs_inode_info *ufsi = UFS_I(inode);
 226         struct super_block *sb = inode->i_sb;
 227         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 228         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 229         unsigned block = ufs_fragstoblks(lastfrag);
 230         unsigned new_size;
 231         void *p;
 232         u64 tmp;
 233
 234         if (writes_to < (lastfrag | uspi->s_fpbmask))
 235                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 236         else
 237                 new_size = uspi->s_fpb;
 238
 239         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 240         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 241                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 242                                 locked_page);
 243         return tmp != 0;
 244 }
 245
 246 /**
 247  * ufs_inode_getfrag() - allocate new fragment(s)
 248  * @inode: pointer to inode
 249  * @index: number of block pointer within the inode's array.
 250  * @new_fragment: number of new allocated fragment(s)
 251  * @err: we set it if something wrong
 252  * @new: we set it if we allocate new block
 253  * @locked_page: for ufs_new_fragments()
 254  */
 255 static u64
 256 ufs_inode_getfrag(struct inode *inode, unsigned index,
 257                   sector_t new_fragment, int *err,
 258                   int *new, struct page *locked_page)
 259 {
 260         struct ufs_inode_info *ufsi = UFS_I(inode);
 261         struct super_block *sb = inode->i_sb;
 262         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 263         u64 tmp, goal, lastfrag;
 264         unsigned nfrags = uspi->s_fpb;
 265         void *p;
 266
 267         /* TODO : to be done for write support
 268         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 269              goto ufs2;
 270          */
 271
 272         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 273         tmp = ufs_data_ptr_to_cpu(sb, p);
 274         if (tmp)
 275                 goto out;
 276
 277         lastfrag = ufsi->i_lastfrag;
 278
 279         /* will that be a new tail? */
 280         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 281                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 282
 283         goal = 0;
 284         if (index) {
 285                 goal = ufs_data_ptr_to_cpu(sb,
 286                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 287                 if (goal)
 288                         goal += uspi->s_fpb;
 289         }
 290         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 291                                 goal, nfrags, err, locked_page);
 292
 293         if (!tmp) {
 294                 *err = -ENOSPC;
 295                 return 0;
 296         }
 297
 298         if (new)
 299                 *new = 1;
 300         inode_set_ctime_current(inode);
 301         if (IS_SYNC(inode))
 302                 ufs_sync_inode (inode);
 303         mark_inode_dirty(inode);
 304 out:
 305         return tmp + uspi->s_sbbase;
 306
 307      /* This part : To be implemented ....
 308         Required only for writing, not required for READ-ONLY.
 309 ufs2:
 310
 311         u2_block = ufs_fragstoblks(fragment);
 312         u2_blockoff = ufs_fragnum(fragment);
 313         p = ufsi->i_u1.u2_i_data + block;
 314         goal = 0;
 315
 316 repeat2:
 317         tmp = fs32_to_cpu(sb, *p);
 318         lastfrag = ufsi->i_lastfrag;
 319
 320      */
 321 }
 322
 323 /**
 324  * ufs_inode_getblock() - allocate new block
 325  * @inode: pointer to inode
 326  * @ind_block: block number of the indirect block
 327  * @index: number of pointer within the indirect block
 328  * @new_fragment: number of new allocated fragment
 329  *  (block will hold this fragment and also uspi->s_fpb-1)
 330  * @err: see ufs_inode_getfrag()
 331  * @new: see ufs_inode_getfrag()
 332  * @locked_page: see ufs_inode_getfrag()
 333  */
 334 static u64
 335 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 336                   unsigned index, sector_t new_fragment, int *err,
 337                   int *new, struct page *locked_page)
 338 {
 339         struct super_block *sb = inode->i_sb;
 340         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 341         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 342         u64 tmp = 0, goal;
 343         struct buffer_head *bh;
 344         void *p;
 345
 346         if (!ind_block)
 347                 return 0;
 348
 349         bh = sb_bread(sb, ind_block + (index >> shift));
 350         if (unlikely(!bh)) {
 351                 *err = -EIO;
 352                 return 0;
 353         }
 354
 355         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 356         if (uspi->fs_magic == UFS2_MAGIC)
 357                 p = (__fs64 *)bh->b_data + index;
 358         else
 359                 p = (__fs32 *)bh->b_data + index;
 360
 361         tmp = ufs_data_ptr_to_cpu(sb, p);
 362         if (tmp)
 363                 goto out;
 364
 365         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 366                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 367                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 368                 goal = tmp + uspi->s_fpb;
 369         else
 370                 goal = bh->b_blocknr + uspi->s_fpb;
 371         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 372                                 uspi->s_fpb, err, locked_page);
 373         if (!tmp)
 374                 goto out;
 375
 376         if (new)
 377                 *new = 1;
 378
 379         mark_buffer_dirty(bh);
 380         if (IS_SYNC(inode))
 381                 sync_dirty_buffer(bh);
 382         inode_set_ctime_current(inode);
 383         mark_inode_dirty(inode);
 384 out:
 385         brelse (bh);
 386         UFSD("EXIT\n");
 387         if (tmp)
 388                 tmp += uspi->s_sbbase;
 389         return tmp;
 390 }
 391
 392 /**
 393  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 394  * read_folio, writepages and so on
 395  */
 396
 397 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 398 {
 399         struct super_block *sb = inode->i_sb;
 400         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 401         int err = 0, new = 0;
 402         unsigned offsets[4];
 403         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 404         u64 phys64 = 0;
 405         unsigned frag = fragment & uspi->s_fpbmask;
 406
 407         phys64 = ufs_frag_map(inode, offsets, depth);
 408         if (!create)
 409                 goto done;
 410
 411         if (phys64) {
 412                 if (fragment >= UFS_NDIR_FRAGMENT)
 413                         goto done;
 414                 read_seqlock_excl(&UFS_I(inode)->meta_lock);
 415                 if (fragment < UFS_I(inode)->i_lastfrag) {
 416                         read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 417                         goto done;
 418                 }
 419                 read_sequnlock_excl(&UFS_I(inode)->meta_lock);
 420         }
 421         /* This code entered only while writing ....? */
 422
 423         mutex_lock(&UFS_I(inode)->truncate_mutex);
 424
 425         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 426         if (unlikely(!depth)) {
 427                 ufs_warning(sb, "ufs_get_block", "block > big");
 428                 err = -EIO;
 429                 goto out;
 430         }
 431
 432         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 433                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 434                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 435                 if (tailfrags && fragment >= lastfrag) {
 436                         if (!ufs_extend_tail(inode, fragment,
 437                                              &err, bh_result->b_page))
 438                                 goto out;
 439                 }
 440         }
 441
 442         if (depth == 1) {
 443                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 444                                            &err, &new, bh_result->b_page);
 445         } else {
 446                 int i;
 447                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 448                                            &err, NULL, NULL);
 449                 for (i = 1; i < depth - 1; i++)
 450                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 451                                                 fragment, &err, NULL, NULL);
 452                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 453                                         fragment, &err, &new, bh_result->b_page);
 454         }
 455 out:
 456         if (phys64) {
 457                 phys64 += frag;
 458                 map_bh(bh_result, sb, phys64);
 459                 if (new)
 460                         set_buffer_new(bh_result);
 461         }
 462         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 463         return err;
 464
 465 done:
 466         if (phys64)
 467                 map_bh(bh_result, sb, phys64 + frag);
 468         return 0;
 469 }
 470
 471 static int ufs_writepages(struct address_space *mapping,
 472                 struct writeback_control *wbc)
 473 {
 474         return mpage_writepages(mapping, wbc, ufs_getfrag_block);
 475 }
 476
 477 static int ufs_read_folio(struct file *file, struct folio *folio)
 478 {
 479         return block_read_full_folio(folio, ufs_getfrag_block);
 480 }
 481
 482 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 483 {
 484         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 485 }
 486
 487 static void ufs_truncate_blocks(struct inode *);
 488
 489 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 490 {
 491         struct inode *inode = mapping->host;
 492
 493         if (to > inode->i_size) {
 494                 truncate_pagecache(inode, inode->i_size);
 495                 ufs_truncate_blocks(inode);
 496         }
 497 }
 498
 499 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 500                         loff_t pos, unsigned len,
 501                         struct page **pagep, void **fsdata)
 502 {
 503         int ret;
 504
 505         ret = block_write_begin(mapping, pos, len, pagep, ufs_getfrag_block);
 506         if (unlikely(ret))
 507                 ufs_write_failed(mapping, pos + len);
 508
 509         return ret;
 510 }
 511
 512 static int ufs_write_end(struct file *file, struct address_space *mapping,
 513                         loff_t pos, unsigned len, unsigned copied,
 514                         struct page *page, void *fsdata)
 515 {
 516         int ret;
 517
 518         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 519         if (ret < len)
 520                 ufs_write_failed(mapping, pos + len);
 521         return ret;
 522 }
 523
 524 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 525 {
 526         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 527 }
 528
 529 const struct address_space_operations ufs_aops = {
 530         .dirty_folio = block_dirty_folio,
 531         .invalidate_folio = block_invalidate_folio,
 532         .read_folio = ufs_read_folio,
 533         .writepages = ufs_writepages,
 534         .write_begin = ufs_write_begin,
 535         .write_end = ufs_write_end,
 536         .migrate_folio = buffer_migrate_folio,
 537         .bmap = ufs_bmap
 538 };
 539
 540 static void ufs_set_inode_ops(struct inode *inode)
 541 {
 542         if (S_ISREG(inode->i_mode)) {
 543                 inode->i_op = &ufs_file_inode_operations;
 544                 inode->i_fop = &ufs_file_operations;
 545                 inode->i_mapping->a_ops = &ufs_aops;
 546         } else if (S_ISDIR(inode->i_mode)) {
 547                 inode->i_op = &ufs_dir_inode_operations;
 548                 inode->i_fop = &ufs_dir_operations;
 549                 inode->i_mapping->a_ops = &ufs_aops;
 550         } else if (S_ISLNK(inode->i_mode)) {
 551                 if (!inode->i_blocks) {
 552                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 553                         inode->i_op = &simple_symlink_inode_operations;
 554                 } else {
 555                         inode->i_mapping->a_ops = &ufs_aops;
 556                         inode->i_op = &page_symlink_inode_operations;
 557                         inode_nohighmem(inode);
 558                 }
 559         } else
 560                 init_special_inode(inode, inode->i_mode,
 561                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 562 }
 563
 564 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 565 {
 566         struct ufs_inode_info *ufsi = UFS_I(inode);
 567         struct super_block *sb = inode->i_sb;
 568         umode_t mode;
 569
 570         /*
 571          * Copy data to the in-core inode.
 572          */
 573         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 574         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 575         if (inode->i_nlink == 0)
 576                 return -ESTALE;
 577
 578         /*
 579          * Linux now has 32-bit uid and gid, so we can support EFT.
 580          */
 581         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 582         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 583
 584         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 585         inode_set_atime(inode,
 586                         (signed)fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec),
 587                         0);
 588         inode_set_ctime(inode,
 589                         (signed)fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec),
 590                         0);
 591         inode_set_mtime(inode,
 592                         (signed)fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec),
 593                         0);
 594         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 595         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 596         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 597         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 598         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 599
 600
 601         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 602                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 603                        sizeof(ufs_inode->ui_u2.ui_addr));
 604         } else {
 605                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 606                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 607                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 608         }
 609         return 0;
 610 }
 611
 612 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 613 {
 614         struct ufs_inode_info *ufsi = UFS_I(inode);
 615         struct super_block *sb = inode->i_sb;
 616         umode_t mode;
 617
 618         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 619         /*
 620          * Copy data to the in-core inode.
 621          */
 622         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 623         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 624         if (inode->i_nlink == 0)
 625                 return -ESTALE;
 626
 627         /*
 628          * Linux now has 32-bit uid and gid, so we can support EFT.
 629          */
 630         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 631         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 632
 633         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 634         inode_set_atime(inode, fs64_to_cpu(sb, ufs2_inode->ui_atime),
 635                         fs32_to_cpu(sb, ufs2_inode->ui_atimensec));
 636         inode_set_ctime(inode, fs64_to_cpu(sb, ufs2_inode->ui_ctime),
 637                         fs32_to_cpu(sb, ufs2_inode->ui_ctimensec));
 638         inode_set_mtime(inode, fs64_to_cpu(sb, ufs2_inode->ui_mtime),
 639                         fs32_to_cpu(sb, ufs2_inode->ui_mtimensec));
 640         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 641         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 642         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 643         /*
 644         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 645         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 646         */
 647
 648         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 649                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 650                        sizeof(ufs2_inode->ui_u2.ui_addr));
 651         } else {
 652                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 653                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 654                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 655         }
 656         return 0;
 657 }
 658
 659 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 660 {
 661         struct ufs_inode_info *ufsi;
 662         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 663         struct buffer_head * bh;
 664         struct inode *inode;
 665         int err = -EIO;
 666
 667         UFSD("ENTER, ino %lu\n", ino);
 668
 669         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 670                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 671                             ino);
 672                 return ERR_PTR(-EIO);
 673         }
 674
 675         inode = iget_locked(sb, ino);
 676         if (!inode)
 677                 return ERR_PTR(-ENOMEM);
 678         if (!(inode->i_state & I_NEW))
 679                 return inode;
 680
 681         ufsi = UFS_I(inode);
 682
 683         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 684         if (!bh) {
 685                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 686                             inode->i_ino);
 687                 goto bad_inode;
 688         }
 689         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 690                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 691
 692                 err = ufs2_read_inode(inode,
 693                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 694         } else {
 695                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 696
 697                 err = ufs1_read_inode(inode,
 698                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 699         }
 700         brelse(bh);
 701         if (err)
 702                 goto bad_inode;
 703
 704         inode_inc_iversion(inode);
 705         ufsi->i_lastfrag =
 706                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 707         ufsi->i_dir_start_lookup = 0;
 708         ufsi->i_osync = 0;
 709
 710         ufs_set_inode_ops(inode);
 711
 712         UFSD("EXIT\n");
 713         unlock_new_inode(inode);
 714         return inode;
 715
 716 bad_inode:
 717         iget_failed(inode);
 718         return ERR_PTR(err);
 719 }
 720
 721 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 722 {
 723         struct super_block *sb = inode->i_sb;
 724         struct ufs_inode_info *ufsi = UFS_I(inode);
 725
 726         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 727         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 728
 729         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 730         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 731
 732         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 733         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb,
 734                                                  inode_get_atime_sec(inode));
 735         ufs_inode->ui_atime.tv_usec = 0;
 736         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb,
 737                                                  inode_get_ctime_sec(inode));
 738         ufs_inode->ui_ctime.tv_usec = 0;
 739         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb,
 740                                                  inode_get_mtime_sec(inode));
 741         ufs_inode->ui_mtime.tv_usec = 0;
 742         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 743         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 744         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 745
 746         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 747                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 748                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 749         }
 750
 751         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 752                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 753                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 754         } else if (inode->i_blocks) {
 755                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 756                        sizeof(ufs_inode->ui_u2.ui_addr));
 757         }
 758         else {
 759                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 760                        sizeof(ufs_inode->ui_u2.ui_symlink));
 761         }
 762
 763         if (!inode->i_nlink)
 764                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 765 }
 766
 767 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 768 {
 769         struct super_block *sb = inode->i_sb;
 770         struct ufs_inode_info *ufsi = UFS_I(inode);
 771
 772         UFSD("ENTER\n");
 773         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 774         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 775
 776         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 777         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 778
 779         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 780         ufs_inode->ui_atime = cpu_to_fs64(sb, inode_get_atime_sec(inode));
 781         ufs_inode->ui_atimensec = cpu_to_fs32(sb,
 782                                               inode_get_atime_nsec(inode));
 783         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode_get_ctime_sec(inode));
 784         ufs_inode->ui_ctimensec = cpu_to_fs32(sb,
 785                                               inode_get_ctime_nsec(inode));
 786         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode_get_mtime_sec(inode));
 787         ufs_inode->ui_mtimensec = cpu_to_fs32(sb,
 788                                               inode_get_mtime_nsec(inode));
 789
 790         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 791         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 792         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 793
 794         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 795                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 796                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 797         } else if (inode->i_blocks) {
 798                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 799                        sizeof(ufs_inode->ui_u2.ui_addr));
 800         } else {
 801                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 802                        sizeof(ufs_inode->ui_u2.ui_symlink));
 803         }
 804
 805         if (!inode->i_nlink)
 806                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 807         UFSD("EXIT\n");
 808 }
 809
 810 static int ufs_update_inode(struct inode * inode, int do_sync)
 811 {
 812         struct super_block *sb = inode->i_sb;
 813         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 814         struct buffer_head * bh;
 815
 816         UFSD("ENTER, ino %lu\n", inode->i_ino);
 817
 818         if (inode->i_ino < UFS_ROOTINO ||
 819             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 820                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 821                 return -1;
 822         }
 823
 824         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 825         if (!bh) {
 826                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 827                 return -1;
 828         }
 829         if (uspi->fs_magic == UFS2_MAGIC) {
 830                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 831
 832                 ufs2_update_inode(inode,
 833                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 834         } else {
 835                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 836
 837                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 838         }
 839
 840         mark_buffer_dirty(bh);
 841         if (do_sync)
 842                 sync_dirty_buffer(bh);
 843         brelse (bh);
 844
 845         UFSD("EXIT\n");
 846         return 0;
 847 }
 848
 849 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 850 {
 851         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 852 }
 853
 854 int ufs_sync_inode (struct inode *inode)
 855 {
 856         return ufs_update_inode (inode, 1);
 857 }
 858
 859 void ufs_evict_inode(struct inode * inode)
 860 {
 861         int want_delete = 0;
 862
 863         if (!inode->i_nlink && !is_bad_inode(inode))
 864                 want_delete = 1;
 865
 866         truncate_inode_pages_final(&inode->i_data);
 867         if (want_delete) {
 868                 inode->i_size = 0;
 869                 if (inode->i_blocks &&
 870                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 871                      S_ISLNK(inode->i_mode)))
 872                         ufs_truncate_blocks(inode);
 873                 ufs_update_inode(inode, inode_needs_sync(inode));
 874         }
 875
 876         invalidate_inode_buffers(inode);
 877         clear_inode(inode);
 878
 879         if (want_delete)
 880                 ufs_free_inode(inode);
 881 }
 882
 883 struct to_free {
 884         struct inode *inode;
 885         u64 to;
 886         unsigned count;
 887 };
 888
 889 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 890 {
 891         if (ctx->count && ctx->to != from) {
 892                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 893                 ctx->count = 0;
 894         }
 895         ctx->count += count;
 896         ctx->to = from + count;
 897 }
 898
 899 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 900
 901 static void ufs_trunc_direct(struct inode *inode)
 902 {
 903         struct ufs_inode_info *ufsi = UFS_I(inode);
 904         struct super_block * sb;
 905         struct ufs_sb_private_info * uspi;
 906         void *p;
 907         u64 frag1, frag2, frag3, frag4, block1, block2;
 908         struct to_free ctx = {.inode = inode};
 909         unsigned i, tmp;
 910
 911         UFSD("ENTER: ino %lu\n", inode->i_ino);
 912
 913         sb = inode->i_sb;
 914         uspi = UFS_SB(sb)->s_uspi;
 915
 916         frag1 = DIRECT_FRAGMENT;
 917         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 918         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 919         frag3 = frag4 & ~uspi->s_fpbmask;
 920         block1 = block2 = 0;
 921         if (frag2 > frag3) {
 922                 frag2 = frag4;
 923                 frag3 = frag4 = 0;
 924         } else if (frag2 < frag3) {
 925                 block1 = ufs_fragstoblks (frag2);
 926                 block2 = ufs_fragstoblks (frag3);
 927         }
 928
 929         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 930              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 931              (unsigned long long)frag1, (unsigned long long)frag2,
 932              (unsigned long long)block1, (unsigned long long)block2,
 933              (unsigned long long)frag3, (unsigned long long)frag4);
 934
 935         if (frag1 >= frag2)
 936                 goto next1;
 937
 938         /*
 939          * Free first free fragments
 940          */
 941         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 942         tmp = ufs_data_ptr_to_cpu(sb, p);
 943         if (!tmp )
 944                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 945         frag2 -= frag1;
 946         frag1 = ufs_fragnum (frag1);
 947
 948         ufs_free_fragments(inode, tmp + frag1, frag2);
 949
 950 next1:
 951         /*
 952          * Free whole blocks
 953          */
 954         for (i = block1 ; i < block2; i++) {
 955                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 956                 tmp = ufs_data_ptr_to_cpu(sb, p);
 957                 if (!tmp)
 958                         continue;
 959                 write_seqlock(&ufsi->meta_lock);
 960                 ufs_data_ptr_clear(uspi, p);
 961                 write_sequnlock(&ufsi->meta_lock);
 962
 963                 free_data(&ctx, tmp, uspi->s_fpb);
 964         }
 965
 966         free_data(&ctx, 0, 0);
 967
 968         if (frag3 >= frag4)
 969                 goto next3;
 970
 971         /*
 972          * Free last free fragments
 973          */
 974         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 975         tmp = ufs_data_ptr_to_cpu(sb, p);
 976         if (!tmp )
 977                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 978         frag4 = ufs_fragnum (frag4);
 979         write_seqlock(&ufsi->meta_lock);
 980         ufs_data_ptr_clear(uspi, p);
 981         write_sequnlock(&ufsi->meta_lock);
 982
 983         ufs_free_fragments (inode, tmp, frag4);
 984  next3:
 985
 986         UFSD("EXIT: ino %lu\n", inode->i_ino);
 987 }
 988
 989 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 990 {
 991         struct super_block *sb = inode->i_sb;
 992         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 993         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 994         unsigned i;
 995
 996         if (!ubh)
 997                 return;
 998
 999         if (--depth) {
1000                 for (i = 0; i < uspi->s_apb; i++) {
1001                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1002                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1003                         if (block)
1004                                 free_full_branch(inode, block, depth);
1005                 }
1006         } else {
1007                 struct to_free ctx = {.inode = inode};
1008
1009                 for (i = 0; i < uspi->s_apb; i++) {
1010                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1011                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1012                         if (block)
1013                                 free_data(&ctx, block, uspi->s_fpb);
1014                 }
1015                 free_data(&ctx, 0, 0);
1016         }
1017
1018         ubh_bforget(ubh);
1019         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
1020 }
1021
1022 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1023 {
1024         struct super_block *sb = inode->i_sb;
1025         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1026         unsigned i;
1027
1028         if (--depth) {
1029                 for (i = from; i < uspi->s_apb ; i++) {
1030                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1031                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1032                         if (block) {
1033                                 write_seqlock(&UFS_I(inode)->meta_lock);
1034                                 ufs_data_ptr_clear(uspi, p);
1035                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1036                                 ubh_mark_buffer_dirty(ubh);
1037                                 free_full_branch(inode, block, depth);
1038                         }
1039                 }
1040         } else {
1041                 struct to_free ctx = {.inode = inode};
1042
1043                 for (i = from; i < uspi->s_apb; i++) {
1044                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1045                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1046                         if (block) {
1047                                 write_seqlock(&UFS_I(inode)->meta_lock);
1048                                 ufs_data_ptr_clear(uspi, p);
1049                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1050                                 ubh_mark_buffer_dirty(ubh);
1051                                 free_data(&ctx, block, uspi->s_fpb);
1052                         }
1053                 }
1054                 free_data(&ctx, 0, 0);
1055         }
1056         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1057                 ubh_sync_block(ubh);
1058         ubh_brelse(ubh);
1059 }
1060
1061 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1062 {
1063         int err = 0;
1064         struct super_block *sb = inode->i_sb;
1065         struct address_space *mapping = inode->i_mapping;
1066         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1067         unsigned i, end;
1068         sector_t lastfrag;
1069         struct folio *folio;
1070         struct buffer_head *bh;
1071         u64 phys64;
1072
1073         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1074
1075         if (!lastfrag)
1076                 goto out;
1077
1078         lastfrag--;
1079
1080         folio = ufs_get_locked_folio(mapping, lastfrag >>
1081                                        (PAGE_SHIFT - inode->i_blkbits));
1082         if (IS_ERR(folio)) {
1083                 err = -EIO;
1084                 goto out;
1085         }
1086
1087         end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1088         bh = folio_buffers(folio);
1089         for (i = 0; i < end; ++i)
1090                 bh = bh->b_this_page;
1091
1092        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1093
1094        if (unlikely(err))
1095                goto out_unlock;
1096
1097        if (buffer_new(bh)) {
1098                clear_buffer_new(bh);
1099                clean_bdev_bh_alias(bh);
1100                /*
1101                 * we do not zeroize fragment, because of
1102                 * if it maped to hole, it already contains zeroes
1103                 */
1104                set_buffer_uptodate(bh);
1105                mark_buffer_dirty(bh);
1106                 folio_mark_dirty(folio);
1107        }
1108
1109        if (lastfrag >= UFS_IND_FRAGMENT) {
1110                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1111                phys64 = bh->b_blocknr + 1;
1112                for (i = 0; i < end; ++i) {
1113                        bh = sb_getblk(sb, i + phys64);
1114                        lock_buffer(bh);
1115                        memset(bh->b_data, 0, sb->s_blocksize);
1116                        set_buffer_uptodate(bh);
1117                        mark_buffer_dirty(bh);
1118                        unlock_buffer(bh);
1119                        sync_dirty_buffer(bh);
1120                        brelse(bh);
1121                }
1122        }
1123 out_unlock:
1124        ufs_put_locked_folio(folio);
1125 out:
1126        return err;
1127 }
1128
1129 static void ufs_truncate_blocks(struct inode *inode)
1130 {
1131         struct ufs_inode_info *ufsi = UFS_I(inode);
1132         struct super_block *sb = inode->i_sb;
1133         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1134         unsigned offsets[4];
1135         int depth;
1136         int depth2;
1137         unsigned i;
1138         struct ufs_buffer_head *ubh[3];
1139         void *p;
1140         u64 block;
1141
1142         if (inode->i_size) {
1143                 sector_t last = (inode->i_size - 1) >> uspi->s_bshift;
1144                 depth = ufs_block_to_path(inode, last, offsets);
1145                 if (!depth)
1146                         return;
1147         } else {
1148                 depth = 1;
1149         }
1150
1151         for (depth2 = depth - 1; depth2; depth2--)
1152                 if (offsets[depth2] != uspi->s_apb - 1)
1153                         break;
1154
1155         mutex_lock(&ufsi->truncate_mutex);
1156         if (depth == 1) {
1157                 ufs_trunc_direct(inode);
1158                 offsets[0] = UFS_IND_BLOCK;
1159         } else {
1160                 /* get the blocks that should be partially emptied */
1161                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++);
1162                 for (i = 0; i < depth2; i++) {
1163                         block = ufs_data_ptr_to_cpu(sb, p);
1164                         if (!block)
1165                                 break;
1166                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1167                         if (!ubh[i]) {
1168                                 write_seqlock(&ufsi->meta_lock);
1169                                 ufs_data_ptr_clear(uspi, p);
1170                                 write_sequnlock(&ufsi->meta_lock);
1171                                 break;
1172                         }
1173                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]++);
1174                 }
1175                 while (i--)
1176                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1177         }
1178         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1179                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1180                 block = ufs_data_ptr_to_cpu(sb, p);
1181                 if (block) {
1182                         write_seqlock(&ufsi->meta_lock);
1183                         ufs_data_ptr_clear(uspi, p);
1184                         write_sequnlock(&ufsi->meta_lock);
1185                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1186                 }
1187         }
1188         read_seqlock_excl(&ufsi->meta_lock);
1189         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1190         read_sequnlock_excl(&ufsi->meta_lock);
1191         mark_inode_dirty(inode);
1192         mutex_unlock(&ufsi->truncate_mutex);
1193 }
1194
1195 static int ufs_truncate(struct inode *inode, loff_t size)
1196 {
1197         int err = 0;
1198
1199         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1200              inode->i_ino, (unsigned long long)size,
1201              (unsigned long long)i_size_read(inode));
1202
1203         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1204               S_ISLNK(inode->i_mode)))
1205                 return -EINVAL;
1206         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1207                 return -EPERM;
1208
1209         err = ufs_alloc_lastblock(inode, size);
1210
1211         if (err)
1212                 goto out;
1213
1214         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1215
1216         truncate_setsize(inode, size);
1217
1218         ufs_truncate_blocks(inode);
1219         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1220         mark_inode_dirty(inode);
1221 out:
1222         UFSD("EXIT: err %d\n", err);
1223         return err;
1224 }
1225
1226 int ufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
1227                 struct iattr *attr)
1228 {
1229         struct inode *inode = d_inode(dentry);
1230         unsigned int ia_valid = attr->ia_valid;
1231         int error;
1232
1233         error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
1234         if (error)
1235                 return error;
1236
1237         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1238                 error = ufs_truncate(inode, attr->ia_size);
1239                 if (error)
1240                         return error;
1241         }
1242
1243         setattr_copy(&nop_mnt_idmap, inode, attr);
1244         mark_inode_dirty(inode);
1245         return 0;
1246 }
1247
1248 const struct inode_operations ufs_file_inode_operations = {
1249         .setattr = ufs_setattr,
1250 };