linux/fs/ntfs/inode.c
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   1/**
   2 * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
   3 *
   4 * Copyright (c) 2001-2007 Anton Altaparmakov
   5 *
   6 * This program/include file is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as published
   8 * by the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program/include file is distributed in the hope that it will be
  12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program (in the main directory of the Linux-NTFS
  18 * distribution in the file COPYING); if not, write to the Free Software
  19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 */
  21
  22#include <linux/buffer_head.h>
  23#include <linux/fs.h>
  24#include <linux/mm.h>
  25#include <linux/mount.h>
  26#include <linux/mutex.h>
  27#include <linux/pagemap.h>
  28#include <linux/quotaops.h>
  29#include <linux/slab.h>
  30#include <linux/log2.h>
  31#include <linux/aio.h>
  32
  33#include "aops.h"
  34#include "attrib.h"
  35#include "bitmap.h"
  36#include "dir.h"
  37#include "debug.h"
  38#include "inode.h"
  39#include "lcnalloc.h"
  40#include "malloc.h"
  41#include "mft.h"
  42#include "time.h"
  43#include "ntfs.h"
  44
  45/**
  46 * ntfs_test_inode - compare two (possibly fake) inodes for equality
  47 * @vi:         vfs inode which to test
  48 * @na:         ntfs attribute which is being tested with
  49 *
  50 * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
  51 * inode @vi for equality with the ntfs attribute @na.
  52 *
  53 * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
  54 * @na->name and @na->name_len are then ignored.
  55 *
  56 * Return 1 if the attributes match and 0 if not.
  57 *
  58 * NOTE: This function runs with the inode->i_lock spin lock held so it is not
  59 * allowed to sleep.
  60 */
  61int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
  62{
  63        ntfs_inode *ni;
  64
  65        if (vi->i_ino != na->mft_no)
  66                return 0;
  67        ni = NTFS_I(vi);
  68        /* If !NInoAttr(ni), @vi is a normal file or directory inode. */
  69        if (likely(!NInoAttr(ni))) {
  70                /* If not looking for a normal inode this is a mismatch. */
  71                if (unlikely(na->type != AT_UNUSED))
  72                        return 0;
  73        } else {
  74                /* A fake inode describing an attribute. */
  75                if (ni->type != na->type)
  76                        return 0;
  77                if (ni->name_len != na->name_len)
  78                        return 0;
  79                if (na->name_len && memcmp(ni->name, na->name,
  80                                na->name_len * sizeof(ntfschar)))
  81                        return 0;
  82        }
  83        /* Match! */
  84        return 1;
  85}
  86
  87/**
  88 * ntfs_init_locked_inode - initialize an inode
  89 * @vi:         vfs inode to initialize
  90 * @na:         ntfs attribute which to initialize @vi to
  91 *
  92 * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
  93 * order to enable ntfs_test_inode() to do its work.
  94 *
  95 * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
  96 * In that case, @na->name and @na->name_len should be set to NULL and 0,
  97 * respectively. Although that is not strictly necessary as
  98 * ntfs_read_locked_inode() will fill them in later.
  99 *
 100 * Return 0 on success and -errno on error.
 101 *
 102 * NOTE: This function runs with the inode->i_lock spin lock held so it is not
 103 * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
 104 */
 105static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
 106{
 107        ntfs_inode *ni = NTFS_I(vi);
 108
 109        vi->i_ino = na->mft_no;
 110
 111        ni->type = na->type;
 112        if (na->type == AT_INDEX_ALLOCATION)
 113                NInoSetMstProtected(ni);
 114
 115        ni->name = na->name;
 116        ni->name_len = na->name_len;
 117
 118        /* If initializing a normal inode, we are done. */
 119        if (likely(na->type == AT_UNUSED)) {
 120                BUG_ON(na->name);
 121                BUG_ON(na->name_len);
 122                return 0;
 123        }
 124
 125        /* It is a fake inode. */
 126        NInoSetAttr(ni);
 127
 128        /*
 129         * We have I30 global constant as an optimization as it is the name
 130         * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC
 131         * allocation but that is ok. And most attributes are unnamed anyway,
 132         * thus the fraction of named attributes with name != I30 is actually
 133         * absolutely tiny.
 134         */
 135        if (na->name_len && na->name != I30) {
 136                unsigned int i;
 137
 138                BUG_ON(!na->name);
 139                i = na->name_len * sizeof(ntfschar);
 140                ni->name = kmalloc(i + sizeof(ntfschar), GFP_ATOMIC);
 141                if (!ni->name)
 142                        return -ENOMEM;
 143                memcpy(ni->name, na->name, i);
 144                ni->name[na->name_len] = 0;
 145        }
 146        return 0;
 147}
 148
 149typedef int (*set_t)(struct inode *, void *);
 150static int ntfs_read_locked_inode(struct inode *vi);
 151static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
 152static int ntfs_read_locked_index_inode(struct inode *base_vi,
 153                struct inode *vi);
 154
 155/**
 156 * ntfs_iget - obtain a struct inode corresponding to a specific normal inode
 157 * @sb:         super block of mounted volume
 158 * @mft_no:     mft record number / inode number to obtain
 159 *
 160 * Obtain the struct inode corresponding to a specific normal inode (i.e. a
 161 * file or directory).
 162 *
 163 * If the inode is in the cache, it is just returned with an increased
 164 * reference count. Otherwise, a new struct inode is allocated and initialized,
 165 * and finally ntfs_read_locked_inode() is called to read in the inode and
 166 * fill in the remainder of the inode structure.
 167 *
 168 * Return the struct inode on success. Check the return value with IS_ERR() and
 169 * if true, the function failed and the error code is obtained from PTR_ERR().
 170 */
 171struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 172{
 173        struct inode *vi;
 174        int err;
 175        ntfs_attr na;
 176
 177        na.mft_no = mft_no;
 178        na.type = AT_UNUSED;
 179        na.name = NULL;
 180        na.name_len = 0;
 181
 182        vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
 183                        (set_t)ntfs_init_locked_inode, &na);
 184        if (unlikely(!vi))
 185                return ERR_PTR(-ENOMEM);
 186
 187        err = 0;
 188
 189        /* If this is a freshly allocated inode, need to read it now. */
 190        if (vi->i_state & I_NEW) {
 191                err = ntfs_read_locked_inode(vi);
 192                unlock_new_inode(vi);
 193        }
 194        /*
 195         * There is no point in keeping bad inodes around if the failure was
 196         * due to ENOMEM. We want to be able to retry again later.
 197         */
 198        if (unlikely(err == -ENOMEM)) {
 199                iput(vi);
 200                vi = ERR_PTR(err);
 201        }
 202        return vi;
 203}
 204
 205/**
 206 * ntfs_attr_iget - obtain a struct inode corresponding to an attribute
 207 * @base_vi:    vfs base inode containing the attribute
 208 * @type:       attribute type
 209 * @name:       Unicode name of the attribute (NULL if unnamed)
 210 * @name_len:   length of @name in Unicode characters (0 if unnamed)
 211 *
 212 * Obtain the (fake) struct inode corresponding to the attribute specified by
 213 * @type, @name, and @name_len, which is present in the base mft record
 214 * specified by the vfs inode @base_vi.
 215 *
 216 * If the attribute inode is in the cache, it is just returned with an
 217 * increased reference count. Otherwise, a new struct inode is allocated and
 218 * initialized, and finally ntfs_read_locked_attr_inode() is called to read the
 219 * attribute and fill in the inode structure.
 220 *
 221 * Note, for index allocation attributes, you need to use ntfs_index_iget()
 222 * instead of ntfs_attr_iget() as working with indices is a lot more complex.
 223 *
 224 * Return the struct inode of the attribute inode on success. Check the return
 225 * value with IS_ERR() and if true, the function failed and the error code is
 226 * obtained from PTR_ERR().
 227 */
 228struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
 229                ntfschar *name, u32 name_len)
 230{
 231        struct inode *vi;
 232        int err;
 233        ntfs_attr na;
 234
 235        /* Make sure no one calls ntfs_attr_iget() for indices. */
 236        BUG_ON(type == AT_INDEX_ALLOCATION);
 237
 238        na.mft_no = base_vi->i_ino;
 239        na.type = type;
 240        na.name = name;
 241        na.name_len = name_len;
 242
 243        vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
 244                        (set_t)ntfs_init_locked_inode, &na);
 245        if (unlikely(!vi))
 246                return ERR_PTR(-ENOMEM);
 247
 248        err = 0;
 249
 250        /* If this is a freshly allocated inode, need to read it now. */
 251        if (vi->i_state & I_NEW) {
 252                err = ntfs_read_locked_attr_inode(base_vi, vi);
 253                unlock_new_inode(vi);
 254        }
 255        /*
 256         * There is no point in keeping bad attribute inodes around. This also
 257         * simplifies things in that we never need to check for bad attribute
 258         * inodes elsewhere.
 259         */
 260        if (unlikely(err)) {
 261                iput(vi);
 262                vi = ERR_PTR(err);
 263        }
 264        return vi;
 265}
 266
 267/**
 268 * ntfs_index_iget - obtain a struct inode corresponding to an index
 269 * @base_vi:    vfs base inode containing the index related attributes
 270 * @name:       Unicode name of the index
 271 * @name_len:   length of @name in Unicode characters
 272 *
 273 * Obtain the (fake) struct inode corresponding to the index specified by @name
 274 * and @name_len, which is present in the base mft record specified by the vfs
 275 * inode @base_vi.
 276 *
 277 * If the index inode is in the cache, it is just returned with an increased
 278 * reference count.  Otherwise, a new struct inode is allocated and
 279 * initialized, and finally ntfs_read_locked_index_inode() is called to read
 280 * the index related attributes and fill in the inode structure.
 281 *
 282 * Return the struct inode of the index inode on success. Check the return
 283 * value with IS_ERR() and if true, the function failed and the error code is
 284 * obtained from PTR_ERR().
 285 */
 286struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
 287                u32 name_len)
 288{
 289        struct inode *vi;
 290        int err;
 291        ntfs_attr na;
 292
 293        na.mft_no = base_vi->i_ino;
 294        na.type = AT_INDEX_ALLOCATION;
 295        na.name = name;
 296        na.name_len = name_len;
 297
 298        vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
 299                        (set_t)ntfs_init_locked_inode, &na);
 300        if (unlikely(!vi))
 301                return ERR_PTR(-ENOMEM);
 302
 303        err = 0;
 304
 305        /* If this is a freshly allocated inode, need to read it now. */
 306        if (vi->i_state & I_NEW) {
 307                err = ntfs_read_locked_index_inode(base_vi, vi);
 308                unlock_new_inode(vi);
 309        }
 310        /*
 311         * There is no point in keeping bad index inodes around.  This also
 312         * simplifies things in that we never need to check for bad index
 313         * inodes elsewhere.
 314         */
 315        if (unlikely(err)) {
 316                iput(vi);
 317                vi = ERR_PTR(err);
 318        }
 319        return vi;
 320}
 321
 322struct inode *ntfs_alloc_big_inode(struct super_block *sb)
 323{
 324        ntfs_inode *ni;
 325
 326        ntfs_debug("Entering.");
 327        ni = kmem_cache_alloc(ntfs_big_inode_cache, GFP_NOFS);
 328        if (likely(ni != NULL)) {
 329                ni->state = 0;
 330                return VFS_I(ni);
 331        }
 332        ntfs_error(sb, "Allocation of NTFS big inode structure failed.");
 333        return NULL;
 334}
 335
 336static void ntfs_i_callback(struct rcu_head *head)
 337{
 338        struct inode *inode = container_of(head, struct inode, i_rcu);
 339        kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
 340}
 341
 342void ntfs_destroy_big_inode(struct inode *inode)
 343{
 344        ntfs_inode *ni = NTFS_I(inode);
 345
 346        ntfs_debug("Entering.");
 347        BUG_ON(ni->page);
 348        if (!atomic_dec_and_test(&ni->count))
 349                BUG();
 350        call_rcu(&inode->i_rcu, ntfs_i_callback);
 351}
 352
 353static inline ntfs_inode *ntfs_alloc_extent_inode(void)
 354{
 355        ntfs_inode *ni;
 356
 357        ntfs_debug("Entering.");
 358        ni = kmem_cache_alloc(ntfs_inode_cache, GFP_NOFS);
 359        if (likely(ni != NULL)) {
 360                ni->state = 0;
 361                return ni;
 362        }
 363        ntfs_error(NULL, "Allocation of NTFS inode structure failed.");
 364        return NULL;
 365}
 366
 367static void ntfs_destroy_extent_inode(ntfs_inode *ni)
 368{
 369        ntfs_debug("Entering.");
 370        BUG_ON(ni->page);
 371        if (!atomic_dec_and_test(&ni->count))
 372                BUG();
 373        kmem_cache_free(ntfs_inode_cache, ni);
 374}
 375
 376/*
 377 * The attribute runlist lock has separate locking rules from the
 378 * normal runlist lock, so split the two lock-classes:
 379 */
 380static struct lock_class_key attr_list_rl_lock_class;
 381
 382/**
 383 * __ntfs_init_inode - initialize ntfs specific part of an inode
 384 * @sb:         super block of mounted volume
 385 * @ni:         freshly allocated ntfs inode which to initialize
 386 *
 387 * Initialize an ntfs inode to defaults.
 388 *
 389 * NOTE: ni->mft_no, ni->state, ni->type, ni->name, and ni->name_len are left
 390 * untouched. Make sure to initialize them elsewhere.
 391 *
 392 * Return zero on success and -ENOMEM on error.
 393 */
 394void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
 395{
 396        ntfs_debug("Entering.");
 397        rwlock_init(&ni->size_lock);
 398        ni->initialized_size = ni->allocated_size = 0;
 399        ni->seq_no = 0;
 400        atomic_set(&ni->count, 1);
 401        ni->vol = NTFS_SB(sb);
 402        ntfs_init_runlist(&ni->runlist);
 403        mutex_init(&ni->mrec_lock);
 404        ni->page = NULL;
 405        ni->page_ofs = 0;
 406        ni->attr_list_size = 0;
 407        ni->attr_list = NULL;
 408        ntfs_init_runlist(&ni->attr_list_rl);
 409        lockdep_set_class(&ni->attr_list_rl.lock,
 410                                &attr_list_rl_lock_class);
 411        ni->itype.index.block_size = 0;
 412        ni->itype.index.vcn_size = 0;
 413        ni->itype.index.collation_rule = 0;
 414        ni->itype.index.block_size_bits = 0;
 415        ni->itype.index.vcn_size_bits = 0;
 416        mutex_init(&ni->extent_lock);
 417        ni->nr_extents = 0;
 418        ni->ext.base_ntfs_ino = NULL;
 419}
 420
 421/*
 422 * Extent inodes get MFT-mapped in a nested way, while the base inode
 423 * is still mapped. Teach this nesting to the lock validator by creating
 424 * a separate class for nested inode's mrec_lock's:
 425 */
 426static struct lock_class_key extent_inode_mrec_lock_key;
 427
 428inline ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
 429                unsigned long mft_no)
 430{
 431        ntfs_inode *ni = ntfs_alloc_extent_inode();
 432
 433        ntfs_debug("Entering.");
 434        if (likely(ni != NULL)) {
 435                __ntfs_init_inode(sb, ni);
 436                lockdep_set_class(&ni->mrec_lock, &extent_inode_mrec_lock_key);
 437                ni->mft_no = mft_no;
 438                ni->type = AT_UNUSED;
 439                ni->name = NULL;
 440                ni->name_len = 0;
 441        }
 442        return ni;
 443}
 444
 445/**
 446 * ntfs_is_extended_system_file - check if a file is in the $Extend directory
 447 * @ctx:        initialized attribute search context
 448 *
 449 * Search all file name attributes in the inode described by the attribute
 450 * search context @ctx and check if any of the names are in the $Extend system
 451 * directory.
 452 *
 453 * Return values:
 454 *         1: file is in $Extend directory
 455 *         0: file is not in $Extend directory
 456 *    -errno: failed to determine if the file is in the $Extend directory
 457 */
 458static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx)
 459{
 460        int nr_links, err;
 461
 462        /* Restart search. */
 463        ntfs_attr_reinit_search_ctx(ctx);
 464
 465        /* Get number of hard links. */
 466        nr_links = le16_to_cpu(ctx->mrec->link_count);
 467
 468        /* Loop through all hard links. */
 469        while (!(err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0,
 470                        ctx))) {
 471                FILE_NAME_ATTR *file_name_attr;
 472                ATTR_RECORD *attr = ctx->attr;
 473                u8 *p, *p2;
 474
 475                nr_links--;
 476                /*
 477                 * Maximum sanity checking as we are called on an inode that
 478                 * we suspect might be corrupt.
 479                 */
 480                p = (u8*)attr + le32_to_cpu(attr->length);
 481                if (p < (u8*)ctx->mrec || (u8*)p > (u8*)ctx->mrec +
 482                                le32_to_cpu(ctx->mrec->bytes_in_use)) {
 483err_corrupt_attr:
 484                        ntfs_error(ctx->ntfs_ino->vol->sb, "Corrupt file name "
 485                                        "attribute. You should run chkdsk.");
 486                        return -EIO;
 487                }
 488                if (attr->non_resident) {
 489                        ntfs_error(ctx->ntfs_ino->vol->sb, "Non-resident file "
 490                                        "name. You should run chkdsk.");
 491                        return -EIO;
 492                }
 493                if (attr->flags) {
 494                        ntfs_error(ctx->ntfs_ino->vol->sb, "File name with "
 495                                        "invalid flags. You should run "
 496                                        "chkdsk.");
 497                        return -EIO;
 498                }
 499                if (!(attr->data.resident.flags & RESIDENT_ATTR_IS_INDEXED)) {
 500                        ntfs_error(ctx->ntfs_ino->vol->sb, "Unindexed file "
 501                                        "name. You should run chkdsk.");
 502                        return -EIO;
 503                }
 504                file_name_attr = (FILE_NAME_ATTR*)((u8*)attr +
 505                                le16_to_cpu(attr->data.resident.value_offset));
 506                p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length);
 507                if (p2 < (u8*)attr || p2 > p)
 508                        goto err_corrupt_attr;
 509                /* This attribute is ok, but is it in the $Extend directory? */
 510                if (MREF_LE(file_name_attr->parent_directory) == FILE_Extend)
 511                        return 1;       /* YES, it's an extended system file. */
 512        }
 513        if (unlikely(err != -ENOENT))
 514                return err;
 515        if (unlikely(nr_links)) {
 516                ntfs_error(ctx->ntfs_ino->vol->sb, "Inode hard link count "
 517                                "doesn't match number of name attributes. You "
 518                                "should run chkdsk.");
 519                return -EIO;
 520        }
 521        return 0;       /* NO, it is not an extended system file. */
 522}
 523
 524/**
 525 * ntfs_read_locked_inode - read an inode from its device
 526 * @vi:         inode to read
 527 *
 528 * ntfs_read_locked_inode() is called from ntfs_iget() to read the inode
 529 * described by @vi into memory from the device.
 530 *
 531 * The only fields in @vi that we need to/can look at when the function is
 532 * called are i_sb, pointing to the mounted device's super block, and i_ino,
 533 * the number of the inode to load.
 534 *
 535 * ntfs_read_locked_inode() maps, pins and locks the mft record number i_ino
 536 * for reading and sets up the necessary @vi fields as well as initializing
 537 * the ntfs inode.
 538 *
 539 * Q: What locks are held when the function is called?
 540 * A: i_state has I_NEW set, hence the inode is locked, also
 541 *    i_count is set to 1, so it is not going to go away
 542 *    i_flags is set to 0 and we have no business touching it.  Only an ioctl()
 543 *    is allowed to write to them. We should of course be honouring them but
 544 *    we need to do that using the IS_* macros defined in include/linux/fs.h.
 545 *    In any case ntfs_read_locked_inode() has nothing to do with i_flags.
 546 *
 547 * Return 0 on success and -errno on error.  In the error case, the inode will
 548 * have had make_bad_inode() executed on it.
 549 */
 550static int ntfs_read_locked_inode(struct inode *vi)
 551{
 552        ntfs_volume *vol = NTFS_SB(vi->i_sb);
 553        ntfs_inode *ni;
 554        struct inode *bvi;
 555        MFT_RECORD *m;
 556        ATTR_RECORD *a;
 557        STANDARD_INFORMATION *si;
 558        ntfs_attr_search_ctx *ctx;
 559        int err = 0;
 560
 561        ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
 562
 563        /* Setup the generic vfs inode parts now. */
 564
 565        /*
 566         * This is for checking whether an inode has changed w.r.t. a file so
 567         * that the file can be updated if necessary (compare with f_version).
 568         */
 569        vi->i_version = 1;
 570
 571        vi->i_uid = vol->uid;
 572        vi->i_gid = vol->gid;
 573        vi->i_mode = 0;
 574
 575        /*
 576         * Initialize the ntfs specific part of @vi special casing
 577         * FILE_MFT which we need to do at mount time.
 578         */
 579        if (vi->i_ino != FILE_MFT)
 580                ntfs_init_big_inode(vi);
 581        ni = NTFS_I(vi);
 582
 583        m = map_mft_record(ni);
 584        if (IS_ERR(m)) {
 585                err = PTR_ERR(m);
 586                goto err_out;
 587        }
 588        ctx = ntfs_attr_get_search_ctx(ni, m);
 589        if (!ctx) {
 590                err = -ENOMEM;
 591                goto unm_err_out;
 592        }
 593
 594        if (!(m->flags & MFT_RECORD_IN_USE)) {
 595                ntfs_error(vi->i_sb, "Inode is not in use!");
 596                goto unm_err_out;
 597        }
 598        if (m->base_mft_record) {
 599                ntfs_error(vi->i_sb, "Inode is an extent inode!");
 600                goto unm_err_out;
 601        }
 602
 603        /* Transfer information from mft record into vfs and ntfs inodes. */
 604        vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
 605
 606        /*
 607         * FIXME: Keep in mind that link_count is two for files which have both
 608         * a long file name and a short file name as separate entries, so if
 609         * we are hiding short file names this will be too high. Either we need
 610         * to account for the short file names by subtracting them or we need
 611         * to make sure we delete files even though i_nlink is not zero which
 612         * might be tricky due to vfs interactions. Need to think about this
 613         * some more when implementing the unlink command.
 614         */
 615        set_nlink(vi, le16_to_cpu(m->link_count));
 616        /*
 617         * FIXME: Reparse points can have the directory bit set even though
 618         * they would be S_IFLNK. Need to deal with this further below when we
 619         * implement reparse points / symbolic links but it will do for now.
 620         * Also if not a directory, it could be something else, rather than
 621         * a regular file. But again, will do for now.
 622         */
 623        /* Everyone gets all permissions. */
 624        vi->i_mode |= S_IRWXUGO;
 625        /* If read-only, no one gets write permissions. */
 626        if (IS_RDONLY(vi))
 627                vi->i_mode &= ~S_IWUGO;
 628        if (m->flags & MFT_RECORD_IS_DIRECTORY) {
 629                vi->i_mode |= S_IFDIR;
 630                /*
 631                 * Apply the directory permissions mask set in the mount
 632                 * options.
 633                 */
 634                vi->i_mode &= ~vol->dmask;
 635                /* Things break without this kludge! */
 636                if (vi->i_nlink > 1)
 637                        set_nlink(vi, 1);
 638        } else {
 639                vi->i_mode |= S_IFREG;
 640                /* Apply the file permissions mask set in the mount options. */
 641                vi->i_mode &= ~vol->fmask;
 642        }
 643        /*
 644         * Find the standard information attribute in the mft record. At this
 645         * stage we haven't setup the attribute list stuff yet, so this could
 646         * in fact fail if the standard information is in an extent record, but
 647         * I don't think this actually ever happens.
 648         */
 649        err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, 0, 0, NULL, 0,
 650                        ctx);
 651        if (unlikely(err)) {
 652                if (err == -ENOENT) {
 653                        /*
 654                         * TODO: We should be performing a hot fix here (if the
 655                         * recover mount option is set) by creating a new
 656                         * attribute.
 657                         */
 658                        ntfs_error(vi->i_sb, "$STANDARD_INFORMATION attribute "
 659                                        "is missing.");
 660                }
 661                goto unm_err_out;
 662        }
 663        a = ctx->attr;
 664        /* Get the standard information attribute value. */
 665        si = (STANDARD_INFORMATION*)((u8*)a +
 666                        le16_to_cpu(a->data.resident.value_offset));
 667
 668        /* Transfer information from the standard information into vi. */
 669        /*
 670         * Note: The i_?times do not quite map perfectly onto the NTFS times,
 671         * but they are close enough, and in the end it doesn't really matter
 672         * that much...
 673         */
 674        /*
 675         * mtime is the last change of the data within the file. Not changed
 676         * when only metadata is changed, e.g. a rename doesn't affect mtime.
 677         */
 678        vi->i_mtime = ntfs2utc(si->last_data_change_time);
 679        /*
 680         * ctime is the last change of the metadata of the file. This obviously
 681         * always changes, when mtime is changed. ctime can be changed on its
 682         * own, mtime is then not changed, e.g. when a file is renamed.
 683         */
 684        vi->i_ctime = ntfs2utc(si->last_mft_change_time);
 685        /*
 686         * Last access to the data within the file. Not changed during a rename
 687         * for example but changed whenever the file is written to.
 688         */
 689        vi->i_atime = ntfs2utc(si->last_access_time);
 690
 691        /* Find the attribute list attribute if present. */
 692        ntfs_attr_reinit_search_ctx(ctx);
 693        err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
 694        if (err) {
 695                if (unlikely(err != -ENOENT)) {
 696                        ntfs_error(vi->i_sb, "Failed to lookup attribute list "
 697                                        "attribute.");
 698                        goto unm_err_out;
 699                }
 700        } else /* if (!err) */ {
 701                if (vi->i_ino == FILE_MFT)
 702                        goto skip_attr_list_load;
 703                ntfs_debug("Attribute list found in inode 0x%lx.", vi->i_ino);
 704                NInoSetAttrList(ni);
 705                a = ctx->attr;
 706                if (a->flags & ATTR_COMPRESSION_MASK) {
 707                        ntfs_error(vi->i_sb, "Attribute list attribute is "
 708                                        "compressed.");
 709                        goto unm_err_out;
 710                }
 711                if (a->flags & ATTR_IS_ENCRYPTED ||
 712                                a->flags & ATTR_IS_SPARSE) {
 713                        if (a->non_resident) {
 714                                ntfs_error(vi->i_sb, "Non-resident attribute "
 715                                                "list attribute is encrypted/"
 716                                                "sparse.");
 717                                goto unm_err_out;
 718                        }
 719                        ntfs_warning(vi->i_sb, "Resident attribute list "
 720                                        "attribute in inode 0x%lx is marked "
 721                                        "encrypted/sparse which is not true.  "
 722                                        "However, Windows allows this and "
 723                                        "chkdsk does not detect or correct it "
 724                                        "so we will just ignore the invalid "
 725                                        "flags and pretend they are not set.",
 726                                        vi->i_ino);
 727                }
 728                /* Now allocate memory for the attribute list. */
 729                ni->attr_list_size = (u32)ntfs_attr_size(a);
 730                ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
 731                if (!ni->attr_list) {
 732                        ntfs_error(vi->i_sb, "Not enough memory to allocate "
 733                                        "buffer for attribute list.");
 734                        err = -ENOMEM;
 735                        goto unm_err_out;
 736                }
 737                if (a->non_resident) {
 738                        NInoSetAttrListNonResident(ni);
 739                        if (a->data.non_resident.lowest_vcn) {
 740                                ntfs_error(vi->i_sb, "Attribute list has non "
 741                                                "zero lowest_vcn.");
 742                                goto unm_err_out;
 743                        }
 744                        /*
 745                         * Setup the runlist. No need for locking as we have
 746                         * exclusive access to the inode at this time.
 747                         */
 748                        ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
 749                                        a, NULL);
 750                        if (IS_ERR(ni->attr_list_rl.rl)) {
 751                                err = PTR_ERR(ni->attr_list_rl.rl);
 752                                ni->attr_list_rl.rl = NULL;
 753                                ntfs_error(vi->i_sb, "Mapping pairs "
 754                                                "decompression failed.");
 755                                goto unm_err_out;
 756                        }
 757                        /* Now load the attribute list. */
 758                        if ((err = load_attribute_list(vol, &ni->attr_list_rl,
 759                                        ni->attr_list, ni->attr_list_size,
 760                                        sle64_to_cpu(a->data.non_resident.
 761                                        initialized_size)))) {
 762                                ntfs_error(vi->i_sb, "Failed to load "
 763                                                "attribute list attribute.");
 764                                goto unm_err_out;
 765                        }
 766                } else /* if (!a->non_resident) */ {
 767                        if ((u8*)a + le16_to_cpu(a->data.resident.value_offset)
 768                                        + le32_to_cpu(
 769                                        a->data.resident.value_length) >
 770                                        (u8*)ctx->mrec + vol->mft_record_size) {
 771                                ntfs_error(vi->i_sb, "Corrupt attribute list "
 772                                                "in inode.");
 773                                goto unm_err_out;
 774                        }
 775                        /* Now copy the attribute list. */
 776                        memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
 777                                        a->data.resident.value_offset),
 778                                        le32_to_cpu(
 779                                        a->data.resident.value_length));
 780                }
 781        }
 782skip_attr_list_load:
 783        /*
 784         * If an attribute list is present we now have the attribute list value
 785         * in ntfs_ino->attr_list and it is ntfs_ino->attr_list_size bytes.
 786         */
 787        if (S_ISDIR(vi->i_mode)) {
 788                loff_t bvi_size;
 789                ntfs_inode *bni;
 790                INDEX_ROOT *ir;
 791                u8 *ir_end, *index_end;
 792
 793                /* It is a directory, find index root attribute. */
 794                ntfs_attr_reinit_search_ctx(ctx);
 795                err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE,
 796                                0, NULL, 0, ctx);
 797                if (unlikely(err)) {
 798                        if (err == -ENOENT) {
 799                                // FIXME: File is corrupt! Hot-fix with empty
 800                                // index root attribute if recovery option is
 801                                // set.
 802                                ntfs_error(vi->i_sb, "$INDEX_ROOT attribute "
 803                                                "is missing.");
 804                        }
 805                        goto unm_err_out;
 806                }
 807                a = ctx->attr;
 808                /* Set up the state. */
 809                if (unlikely(a->non_resident)) {
 810                        ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
 811                                        "resident.");
 812                        goto unm_err_out;
 813                }
 814                /* Ensure the attribute name is placed before the value. */
 815                if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
 816                                le16_to_cpu(a->data.resident.value_offset)))) {
 817                        ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
 818                                        "placed after the attribute value.");
 819                        goto unm_err_out;
 820                }
 821                /*
 822                 * Compressed/encrypted index root just means that the newly
 823                 * created files in that directory should be created compressed/
 824                 * encrypted. However index root cannot be both compressed and
 825                 * encrypted.
 826                 */
 827                if (a->flags & ATTR_COMPRESSION_MASK)
 828                        NInoSetCompressed(ni);
 829                if (a->flags & ATTR_IS_ENCRYPTED) {
 830                        if (a->flags & ATTR_COMPRESSION_MASK) {
 831                                ntfs_error(vi->i_sb, "Found encrypted and "
 832                                                "compressed attribute.");
 833                                goto unm_err_out;
 834                        }
 835                        NInoSetEncrypted(ni);
 836                }
 837                if (a->flags & ATTR_IS_SPARSE)
 838                        NInoSetSparse(ni);
 839                ir = (INDEX_ROOT*)((u8*)a +
 840                                le16_to_cpu(a->data.resident.value_offset));
 841                ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
 842                if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
 843                        ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
 844                                        "corrupt.");
 845                        goto unm_err_out;
 846                }
 847                index_end = (u8*)&ir->index +
 848                                le32_to_cpu(ir->index.index_length);
 849                if (index_end > ir_end) {
 850                        ntfs_error(vi->i_sb, "Directory index is corrupt.");
 851                        goto unm_err_out;
 852                }
 853                if (ir->type != AT_FILE_NAME) {
 854                        ntfs_error(vi->i_sb, "Indexed attribute is not "
 855                                        "$FILE_NAME.");
 856                        goto unm_err_out;
 857                }
 858                if (ir->collation_rule != COLLATION_FILE_NAME) {
 859                        ntfs_error(vi->i_sb, "Index collation rule is not "
 860                                        "COLLATION_FILE_NAME.");
 861                        goto unm_err_out;
 862                }
 863                ni->itype.index.collation_rule = ir->collation_rule;
 864                ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
 865                if (ni->itype.index.block_size &
 866                                (ni->itype.index.block_size - 1)) {
 867                        ntfs_error(vi->i_sb, "Index block size (%u) is not a "
 868                                        "power of two.",
 869                                        ni->itype.index.block_size);
 870                        goto unm_err_out;
 871                }
 872                if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
 873                        ntfs_error(vi->i_sb, "Index block size (%u) > "
 874                                        "PAGE_CACHE_SIZE (%ld) is not "
 875                                        "supported.  Sorry.",
 876                                        ni->itype.index.block_size,
 877                                        PAGE_CACHE_SIZE);
 878                        err = -EOPNOTSUPP;
 879                        goto unm_err_out;
 880                }
 881                if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
 882                        ntfs_error(vi->i_sb, "Index block size (%u) < "
 883                                        "NTFS_BLOCK_SIZE (%i) is not "
 884                                        "supported.  Sorry.",
 885                                        ni->itype.index.block_size,
 886                                        NTFS_BLOCK_SIZE);
 887                        err = -EOPNOTSUPP;
 888                        goto unm_err_out;
 889                }
 890                ni->itype.index.block_size_bits =
 891                                ffs(ni->itype.index.block_size) - 1;
 892                /* Determine the size of a vcn in the directory index. */
 893                if (vol->cluster_size <= ni->itype.index.block_size) {
 894                        ni->itype.index.vcn_size = vol->cluster_size;
 895                        ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
 896                } else {
 897                        ni->itype.index.vcn_size = vol->sector_size;
 898                        ni->itype.index.vcn_size_bits = vol->sector_size_bits;
 899                }
 900
 901                /* Setup the index allocation attribute, even if not present. */
 902                NInoSetMstProtected(ni);
 903                ni->type = AT_INDEX_ALLOCATION;
 904                ni->name = I30;
 905                ni->name_len = 4;
 906
 907                if (!(ir->index.flags & LARGE_INDEX)) {
 908                        /* No index allocation. */
 909                        vi->i_size = ni->initialized_size =
 910                                        ni->allocated_size = 0;
 911                        /* We are done with the mft record, so we release it. */
 912                        ntfs_attr_put_search_ctx(ctx);
 913                        unmap_mft_record(ni);
 914                        m = NULL;
 915                        ctx = NULL;
 916                        goto skip_large_dir_stuff;
 917                } /* LARGE_INDEX: Index allocation present. Setup state. */
 918                NInoSetIndexAllocPresent(ni);
 919                /* Find index allocation attribute. */
 920                ntfs_attr_reinit_search_ctx(ctx);
 921                err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4,
 922                                CASE_SENSITIVE, 0, NULL, 0, ctx);
 923                if (unlikely(err)) {
 924                        if (err == -ENOENT)
 925                                ntfs_error(vi->i_sb, "$INDEX_ALLOCATION "
 926                                                "attribute is not present but "
 927                                                "$INDEX_ROOT indicated it is.");
 928                        else
 929                                ntfs_error(vi->i_sb, "Failed to lookup "
 930                                                "$INDEX_ALLOCATION "
 931                                                "attribute.");
 932                        goto unm_err_out;
 933                }
 934                a = ctx->attr;
 935                if (!a->non_resident) {
 936                        ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
 937                                        "is resident.");
 938                        goto unm_err_out;
 939                }
 940                /*
 941                 * Ensure the attribute name is placed before the mapping pairs
 942                 * array.
 943                 */
 944                if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
 945                                le16_to_cpu(
 946                                a->data.non_resident.mapping_pairs_offset)))) {
 947                        ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
 948                                        "is placed after the mapping pairs "
 949                                        "array.");
 950                        goto unm_err_out;
 951                }
 952                if (a->flags & ATTR_IS_ENCRYPTED) {
 953                        ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
 954                                        "is encrypted.");
 955                        goto unm_err_out;
 956                }
 957                if (a->flags & ATTR_IS_SPARSE) {
 958                        ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
 959                                        "is sparse.");
 960                        goto unm_err_out;
 961                }
 962                if (a->flags & ATTR_COMPRESSION_MASK) {
 963                        ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
 964                                        "is compressed.");
 965                        goto unm_err_out;
 966                }
 967                if (a->data.non_resident.lowest_vcn) {
 968                        ntfs_error(vi->i_sb, "First extent of "
 969                                        "$INDEX_ALLOCATION attribute has non "
 970                                        "zero lowest_vcn.");
 971                        goto unm_err_out;
 972                }
 973                vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
 974                ni->initialized_size = sle64_to_cpu(
 975                                a->data.non_resident.initialized_size);
 976                ni->allocated_size = sle64_to_cpu(
 977                                a->data.non_resident.allocated_size);
 978                /*
 979                 * We are done with the mft record, so we release it. Otherwise
 980                 * we would deadlock in ntfs_attr_iget().
 981                 */
 982                ntfs_attr_put_search_ctx(ctx);
 983                unmap_mft_record(ni);
 984                m = NULL;
 985                ctx = NULL;
 986                /* Get the index bitmap attribute inode. */
 987                bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4);
 988                if (IS_ERR(bvi)) {
 989                        ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
 990                        err = PTR_ERR(bvi);
 991                        goto unm_err_out;
 992                }
 993                bni = NTFS_I(bvi);
 994                if (NInoCompressed(bni) || NInoEncrypted(bni) ||
 995                                NInoSparse(bni)) {
 996                        ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
 997                                        "and/or encrypted and/or sparse.");
 998                        goto iput_unm_err_out;
 999                }
1000                /* Consistency check bitmap size vs. index allocation size. */
1001                bvi_size = i_size_read(bvi);
1002                if ((bvi_size << 3) < (vi->i_size >>
1003                                ni->itype.index.block_size_bits)) {
1004                        ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
1005                                        "for index allocation (0x%llx).",
1006                                        bvi_size << 3, vi->i_size);
1007                        goto iput_unm_err_out;
1008                }
1009                /* No longer need the bitmap attribute inode. */
1010                iput(bvi);
1011skip_large_dir_stuff:
1012                /* Setup the operations for this inode. */
1013                vi->i_op = &ntfs_dir_inode_ops;
1014                vi->i_fop = &ntfs_dir_ops;
1015        } else {
1016                /* It is a file. */
1017                ntfs_attr_reinit_search_ctx(ctx);
1018
1019                /* Setup the data attribute, even if not present. */
1020                ni->type = AT_DATA;
1021                ni->name = NULL;
1022                ni->name_len = 0;
1023
1024                /* Find first extent of the unnamed data attribute. */
1025                err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx);
1026                if (unlikely(err)) {
1027                        vi->i_size = ni->initialized_size =
1028                                        ni->allocated_size = 0;
1029                        if (err != -ENOENT) {
1030                                ntfs_error(vi->i_sb, "Failed to lookup $DATA "
1031                                                "attribute.");
1032                                goto unm_err_out;
1033                        }
1034                        /*
1035                         * FILE_Secure does not have an unnamed $DATA
1036                         * attribute, so we special case it here.
1037                         */
1038                        if (vi->i_ino == FILE_Secure)
1039                                goto no_data_attr_special_case;
1040                        /*
1041                         * Most if not all the system files in the $Extend
1042                         * system directory do not have unnamed data
1043                         * attributes so we need to check if the parent
1044                         * directory of the file is FILE_Extend and if it is
1045                         * ignore this error. To do this we need to get the
1046                         * name of this inode from the mft record as the name
1047                         * contains the back reference to the parent directory.
1048                         */
1049                        if (ntfs_is_extended_system_file(ctx) > 0)
1050                                goto no_data_attr_special_case;
1051                        // FIXME: File is corrupt! Hot-fix with empty data
1052                        // attribute if recovery option is set.
1053                        ntfs_error(vi->i_sb, "$DATA attribute is missing.");
1054                        goto unm_err_out;
1055                }
1056                a = ctx->attr;
1057                /* Setup the state. */
1058                if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1059                        if (a->flags & ATTR_COMPRESSION_MASK) {
1060                                NInoSetCompressed(ni);
1061                                if (vol->cluster_size > 4096) {
1062                                        ntfs_error(vi->i_sb, "Found "
1063                                                        "compressed data but "
1064                                                        "compression is "
1065                                                        "disabled due to "
1066                                                        "cluster size (%i) > "
1067                                                        "4kiB.",
1068                                                        vol->cluster_size);
1069                                        goto unm_err_out;
1070                                }
1071                                if ((a->flags & ATTR_COMPRESSION_MASK)
1072                                                != ATTR_IS_COMPRESSED) {
1073                                        ntfs_error(vi->i_sb, "Found unknown "
1074                                                        "compression method "
1075                                                        "or corrupt file.");
1076                                        goto unm_err_out;
1077                                }
1078                        }
1079                        if (a->flags & ATTR_IS_SPARSE)
1080                                NInoSetSparse(ni);
1081                }
1082                if (a->flags & ATTR_IS_ENCRYPTED) {
1083                        if (NInoCompressed(ni)) {
1084                                ntfs_error(vi->i_sb, "Found encrypted and "
1085                                                "compressed data.");
1086                                goto unm_err_out;
1087                        }
1088                        NInoSetEncrypted(ni);
1089                }
1090                if (a->non_resident) {
1091                        NInoSetNonResident(ni);
1092                        if (NInoCompressed(ni) || NInoSparse(ni)) {
1093                                if (NInoCompressed(ni) && a->data.non_resident.
1094                                                compression_unit != 4) {
1095                                        ntfs_error(vi->i_sb, "Found "
1096                                                        "non-standard "
1097                                                        "compression unit (%u "
1098                                                        "instead of 4).  "
1099                                                        "Cannot handle this.",
1100                                                        a->data.non_resident.
1101                                                        compression_unit);
1102                                        err = -EOPNOTSUPP;
1103                                        goto unm_err_out;
1104                                }
1105                                if (a->data.non_resident.compression_unit) {
1106                                        ni->itype.compressed.block_size = 1U <<
1107                                                        (a->data.non_resident.
1108                                                        compression_unit +
1109                                                        vol->cluster_size_bits);
1110                                        ni->itype.compressed.block_size_bits =
1111                                                        ffs(ni->itype.
1112                                                        compressed.
1113                                                        block_size) - 1;
1114                                        ni->itype.compressed.block_clusters =
1115                                                        1U << a->data.
1116                                                        non_resident.
1117                                                        compression_unit;
1118                                } else {
1119                                        ni->itype.compressed.block_size = 0;
1120                                        ni->itype.compressed.block_size_bits =
1121                                                        0;
1122                                        ni->itype.compressed.block_clusters =
1123                                                        0;
1124                                }
1125                                ni->itype.compressed.size = sle64_to_cpu(
1126                                                a->data.non_resident.
1127                                                compressed_size);
1128                        }
1129                        if (a->data.non_resident.lowest_vcn) {
1130                                ntfs_error(vi->i_sb, "First extent of $DATA "
1131                                                "attribute has non zero "
1132                                                "lowest_vcn.");
1133                                goto unm_err_out;
1134                        }
1135                        vi->i_size = sle64_to_cpu(
1136                                        a->data.non_resident.data_size);
1137                        ni->initialized_size = sle64_to_cpu(
1138                                        a->data.non_resident.initialized_size);
1139                        ni->allocated_size = sle64_to_cpu(
1140                                        a->data.non_resident.allocated_size);
1141                } else { /* Resident attribute. */
1142                        vi->i_size = ni->initialized_size = le32_to_cpu(
1143                                        a->data.resident.value_length);
1144                        ni->allocated_size = le32_to_cpu(a->length) -
1145                                        le16_to_cpu(
1146                                        a->data.resident.value_offset);
1147                        if (vi->i_size > ni->allocated_size) {
1148                                ntfs_error(vi->i_sb, "Resident data attribute "
1149                                                "is corrupt (size exceeds "
1150                                                "allocation).");
1151                                goto unm_err_out;
1152                        }
1153                }
1154no_data_attr_special_case:
1155                /* We are done with the mft record, so we release it. */
1156                ntfs_attr_put_search_ctx(ctx);
1157                unmap_mft_record(ni);
1158                m = NULL;
1159                ctx = NULL;
1160                /* Setup the operations for this inode. */
1161                vi->i_op = &ntfs_file_inode_ops;
1162                vi->i_fop = &ntfs_file_ops;
1163        }
1164        if (NInoMstProtected(ni))
1165                vi->i_mapping->a_ops = &ntfs_mst_aops;
1166        else
1167                vi->i_mapping->a_ops = &ntfs_aops;
1168        /*
1169         * The number of 512-byte blocks used on disk (for stat). This is in so
1170         * far inaccurate as it doesn't account for any named streams or other
1171         * special non-resident attributes, but that is how Windows works, too,
1172         * so we are at least consistent with Windows, if not entirely
1173         * consistent with the Linux Way. Doing it the Linux Way would cause a
1174         * significant slowdown as it would involve iterating over all
1175         * attributes in the mft record and adding the allocated/compressed
1176         * sizes of all non-resident attributes present to give us the Linux
1177         * correct size that should go into i_blocks (after division by 512).
1178         */
1179        if (S_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni)))
1180                vi->i_blocks = ni->itype.compressed.size >> 9;
1181        else
1182                vi->i_blocks = ni->allocated_size >> 9;
1183        ntfs_debug("Done.");
1184        return 0;
1185iput_unm_err_out:
1186        iput(bvi);
1187unm_err_out:
1188        if (!err)
1189                err = -EIO;
1190        if (ctx)
1191                ntfs_attr_put_search_ctx(ctx);
1192        if (m)
1193                unmap_mft_record(ni);
1194err_out:
1195        ntfs_error(vol->sb, "Failed with error code %i.  Marking corrupt "
1196                        "inode 0x%lx as bad.  Run chkdsk.", err, vi->i_ino);
1197        make_bad_inode(vi);
1198        if (err != -EOPNOTSUPP && err != -ENOMEM)
1199                NVolSetErrors(vol);
1200        return err;
1201}
1202
1203/**
1204 * ntfs_read_locked_attr_inode - read an attribute inode from its base inode
1205 * @base_vi:    base inode
1206 * @vi:         attribute inode to read
1207 *
1208 * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the
1209 * attribute inode described by @vi into memory from the base mft record
1210 * described by @base_ni.
1211 *
1212 * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for
1213 * reading and looks up the attribute described by @vi before setting up the
1214 * necessary fields in @vi as well as initializing the ntfs inode.
1215 *
1216 * Q: What locks are held when the function is called?
1217 * A: i_state has I_NEW set, hence the inode is locked, also
1218 *    i_count is set to 1, so it is not going to go away
1219 *
1220 * Return 0 on success and -errno on error.  In the error case, the inode will
1221 * have had make_bad_inode() executed on it.
1222 *
1223 * Note this cannot be called for AT_INDEX_ALLOCATION.
1224 */
1225static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
1226{
1227        ntfs_volume *vol = NTFS_SB(vi->i_sb);
1228        ntfs_inode *ni, *base_ni;
1229        MFT_RECORD *m;
1230        ATTR_RECORD *a;
1231        ntfs_attr_search_ctx *ctx;
1232        int err = 0;
1233
1234        ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1235
1236        ntfs_init_big_inode(vi);
1237
1238        ni      = NTFS_I(vi);
1239        base_ni = NTFS_I(base_vi);
1240
1241        /* Just mirror the values from the base inode. */
1242        vi->i_version   = base_vi->i_version;
1243        vi->i_uid       = base_vi->i_uid;
1244        vi->i_gid       = base_vi->i_gid;
1245        set_nlink(vi, base_vi->i_nlink);
1246        vi->i_mtime     = base_vi->i_mtime;
1247        vi->i_ctime     = base_vi->i_ctime;
1248        vi->i_atime     = base_vi->i_atime;
1249        vi->i_generation = ni->seq_no = base_ni->seq_no;
1250
1251        /* Set inode type to zero but preserve permissions. */
1252        vi->i_mode      = base_vi->i_mode & ~S_IFMT;
1253
1254        m = map_mft_record(base_ni);
1255        if (IS_ERR(m)) {
1256                err = PTR_ERR(m);
1257                goto err_out;
1258        }
1259        ctx = ntfs_attr_get_search_ctx(base_ni, m);
1260        if (!ctx) {
1261                err = -ENOMEM;
1262                goto unm_err_out;
1263        }
1264        /* Find the attribute. */
1265        err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1266                        CASE_SENSITIVE, 0, NULL, 0, ctx);
1267        if (unlikely(err))
1268                goto unm_err_out;
1269        a = ctx->attr;
1270        if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1271                if (a->flags & ATTR_COMPRESSION_MASK) {
1272                        NInoSetCompressed(ni);
1273                        if ((ni->type != AT_DATA) || (ni->type == AT_DATA &&
1274                                        ni->name_len)) {
1275                                ntfs_error(vi->i_sb, "Found compressed "
1276                                                "non-data or named data "
1277                                                "attribute.  Please report "
1278                                                "you saw this message to "
1279                                                "linux-ntfs-dev@lists."
1280                                                "sourceforge.net");
1281                                goto unm_err_out;
1282                        }
1283                        if (vol->cluster_size > 4096) {
1284                                ntfs_error(vi->i_sb, "Found compressed "
1285                                                "attribute but compression is "
1286                                                "disabled due to cluster size "
1287                                                "(%i) > 4kiB.",
1288                                                vol->cluster_size);
1289                                goto unm_err_out;
1290                        }
1291                        if ((a->flags & ATTR_COMPRESSION_MASK) !=
1292                                        ATTR_IS_COMPRESSED) {
1293                                ntfs_error(vi->i_sb, "Found unknown "
1294                                                "compression method.");
1295                                goto unm_err_out;
1296                        }
1297                }
1298                /*
1299                 * The compressed/sparse flag set in an index root just means
1300                 * to compress all files.
1301                 */
1302                if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1303                        ntfs_error(vi->i_sb, "Found mst protected attribute "
1304                                        "but the attribute is %s.  Please "
1305                                        "report you saw this message to "
1306                                        "linux-ntfs-dev@lists.sourceforge.net",
1307                                        NInoCompressed(ni) ? "compressed" :
1308                                        "sparse");
1309                        goto unm_err_out;
1310                }
1311                if (a->flags & ATTR_IS_SPARSE)
1312                        NInoSetSparse(ni);
1313        }
1314        if (a->flags & ATTR_IS_ENCRYPTED) {
1315                if (NInoCompressed(ni)) {
1316                        ntfs_error(vi->i_sb, "Found encrypted and compressed "
1317                                        "data.");
1318                        goto unm_err_out;
1319                }
1320                /*
1321                 * The encryption flag set in an index root just means to
1322                 * encrypt all files.
1323                 */
1324                if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1325                        ntfs_error(vi->i_sb, "Found mst protected attribute "
1326                                        "but the attribute is encrypted.  "
1327                                        "Please report you saw this message "
1328                                        "to linux-ntfs-dev@lists.sourceforge."
1329                                        "net");
1330                        goto unm_err_out;
1331                }
1332                if (ni->type != AT_DATA) {
1333                        ntfs_error(vi->i_sb, "Found encrypted non-data "
1334                                        "attribute.");
1335                        goto unm_err_out;
1336                }
1337                NInoSetEncrypted(ni);
1338        }
1339        if (!a->non_resident) {
1340                /* Ensure the attribute name is placed before the value. */
1341                if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1342                                le16_to_cpu(a->data.resident.value_offset)))) {
1343                        ntfs_error(vol->sb, "Attribute name is placed after "
1344                                        "the attribute value.");
1345                        goto unm_err_out;
1346                }
1347                if (NInoMstProtected(ni)) {
1348                        ntfs_error(vi->i_sb, "Found mst protected attribute "
1349                                        "but the attribute is resident.  "
1350                                        "Please report you saw this message to "
1351                                        "linux-ntfs-dev@lists.sourceforge.net");
1352                        goto unm_err_out;
1353                }
1354                vi->i_size = ni->initialized_size = le32_to_cpu(
1355                                a->data.resident.value_length);
1356                ni->allocated_size = le32_to_cpu(a->length) -
1357                                le16_to_cpu(a->data.resident.value_offset);
1358                if (vi->i_size > ni->allocated_size) {
1359                        ntfs_error(vi->i_sb, "Resident attribute is corrupt "
1360                                        "(size exceeds allocation).");
1361                        goto unm_err_out;
1362                }
1363        } else {
1364                NInoSetNonResident(ni);
1365                /*
1366                 * Ensure the attribute name is placed before the mapping pairs
1367                 * array.
1368                 */
1369                if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1370                                le16_to_cpu(
1371                                a->data.non_resident.mapping_pairs_offset)))) {
1372                        ntfs_error(vol->sb, "Attribute name is placed after "
1373                                        "the mapping pairs array.");
1374                        goto unm_err_out;
1375                }
1376                if (NInoCompressed(ni) || NInoSparse(ni)) {
1377                        if (NInoCompressed(ni) && a->data.non_resident.
1378                                        compression_unit != 4) {
1379                                ntfs_error(vi->i_sb, "Found non-standard "
1380                                                "compression unit (%u instead "
1381                                                "of 4).  Cannot handle this.",
1382                                                a->data.non_resident.
1383                                                compression_unit);
1384                                err = -EOPNOTSUPP;
1385                                goto unm_err_out;
1386                        }
1387                        if (a->data.non_resident.compression_unit) {
1388                                ni->itype.compressed.block_size = 1U <<
1389                                                (a->data.non_resident.
1390                                                compression_unit +
1391                                                vol->cluster_size_bits);
1392                                ni->itype.compressed.block_size_bits =
1393                                                ffs(ni->itype.compressed.
1394                                                block_size) - 1;
1395                                ni->itype.compressed.block_clusters = 1U <<
1396                                                a->data.non_resident.
1397                                                compression_unit;
1398                        } else {
1399                                ni->itype.compressed.block_size = 0;
1400                                ni->itype.compressed.block_size_bits = 0;
1401                                ni->itype.compressed.block_clusters = 0;
1402                        }
1403                        ni->itype.compressed.size = sle64_to_cpu(
1404                                        a->data.non_resident.compressed_size);
1405                }
1406                if (a->data.non_resident.lowest_vcn) {
1407                        ntfs_error(vi->i_sb, "First extent of attribute has "
1408                                        "non-zero lowest_vcn.");
1409                        goto unm_err_out;
1410                }
1411                vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
1412                ni->initialized_size = sle64_to_cpu(
1413                                a->data.non_resident.initialized_size);
1414                ni->allocated_size = sle64_to_cpu(
1415                                a->data.non_resident.allocated_size);
1416        }
1417        if (NInoMstProtected(ni))
1418                vi->i_mapping->a_ops = &ntfs_mst_aops;
1419        else
1420                vi->i_mapping->a_ops = &ntfs_aops;
1421        if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
1422                vi->i_blocks = ni->itype.compressed.size >> 9;
1423        else
1424                vi->i_blocks = ni->allocated_size >> 9;
1425        /*
1426         * Make sure the base inode does not go away and attach it to the
1427         * attribute inode.
1428         */
1429        igrab(base_vi);
1430        ni->ext.base_ntfs_ino = base_ni;
1431        ni->nr_extents = -1;
1432
1433        ntfs_attr_put_search_ctx(ctx);
1434        unmap_mft_record(base_ni);
1435
1436        ntfs_debug("Done.");
1437        return 0;
1438
1439unm_err_out:
1440        if (!err)
1441                err = -EIO;
1442        if (ctx)
1443                ntfs_attr_put_search_ctx(ctx);
1444        unmap_mft_record(base_ni);
1445err_out:
1446        ntfs_error(vol->sb, "Failed with error code %i while reading attribute "
1447                        "inode (mft_no 0x%lx, type 0x%x, name_len %i).  "
1448                        "Marking corrupt inode and base inode 0x%lx as bad.  "
1449                        "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len,
1450                        base_vi->i_ino);
1451        make_bad_inode(vi);
1452        if (err != -ENOMEM)
1453                NVolSetErrors(vol);
1454        return err;
1455}
1456
1457/**
1458 * ntfs_read_locked_index_inode - read an index inode from its base inode
1459 * @base_vi:    base inode
1460 * @vi:         index inode to read
1461 *
1462 * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the
1463 * index inode described by @vi into memory from the base mft record described
1464 * by @base_ni.
1465 *
1466 * ntfs_read_locked_index_inode() maps, pins and locks the base inode for
1467 * reading and looks up the attributes relating to the index described by @vi
1468 * before setting up the necessary fields in @vi as well as initializing the
1469 * ntfs inode.
1470 *
1471 * Note, index inodes are essentially attribute inodes (NInoAttr() is true)
1472 * with the attribute type set to AT_INDEX_ALLOCATION.  Apart from that, they
1473 * are setup like directory inodes since directories are a special case of
1474 * indices ao they need to be treated in much the same way.  Most importantly,
1475 * for small indices the index allocation attribute might not actually exist.
1476 * However, the index root attribute always exists but this does not need to
1477 * have an inode associated with it and this is why we define a new inode type
1478 * index.  Also, like for directories, we need to have an attribute inode for
1479 * the bitmap attribute corresponding to the index allocation attribute and we
1480 * can store this in the appropriate field of the inode, just like we do for
1481 * normal directory inodes.
1482 *
1483 * Q: What locks are held when the function is called?
1484 * A: i_state has I_NEW set, hence the inode is locked, also
1485 *    i_count is set to 1, so it is not going to go away
1486 *
1487 * Return 0 on success and -errno on error.  In the error case, the inode will
1488 * have had make_bad_inode() executed on it.
1489 */
1490static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
1491{
1492        loff_t bvi_size;
1493        ntfs_volume *vol = NTFS_SB(vi->i_sb);
1494        ntfs_inode *ni, *base_ni, *bni;
1495        struct inode *bvi;
1496        MFT_RECORD *m;
1497        ATTR_RECORD *a;
1498        ntfs_attr_search_ctx *ctx;
1499        INDEX_ROOT *ir;
1500        u8 *ir_end, *index_end;
1501        int err = 0;
1502
1503        ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1504        ntfs_init_big_inode(vi);
1505        ni      = NTFS_I(vi);
1506        base_ni = NTFS_I(base_vi);
1507        /* Just mirror the values from the base inode. */
1508        vi->i_version   = base_vi->i_version;
1509        vi->i_uid       = base_vi->i_uid;
1510        vi->i_gid       = base_vi->i_gid;
1511        set_nlink(vi, base_vi->i_nlink);
1512        vi->i_mtime     = base_vi->i_mtime;
1513        vi->i_ctime     = base_vi->i_ctime;
1514        vi->i_atime     = base_vi->i_atime;
1515        vi->i_generation = ni->seq_no = base_ni->seq_no;
1516        /* Set inode type to zero but preserve permissions. */
1517        vi->i_mode      = base_vi->i_mode & ~S_IFMT;
1518        /* Map the mft record for the base inode. */
1519        m = map_mft_record(base_ni);
1520        if (IS_ERR(m)) {
1521                err = PTR_ERR(m);
1522                goto err_out;
1523        }
1524        ctx = ntfs_attr_get_search_ctx(base_ni, m);
1525        if (!ctx) {
1526                err = -ENOMEM;
1527                goto unm_err_out;
1528        }
1529        /* Find the index root attribute. */
1530        err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len,
1531                        CASE_SENSITIVE, 0, NULL, 0, ctx);
1532        if (unlikely(err)) {
1533                if (err == -ENOENT)
1534                        ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
1535                                        "missing.");
1536                goto unm_err_out;
1537        }
1538        a = ctx->attr;
1539        /* Set up the state. */
1540        if (unlikely(a->non_resident)) {
1541                ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
1542                goto unm_err_out;
1543        }
1544        /* Ensure the attribute name is placed before the value. */
1545        if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1546                        le16_to_cpu(a->data.resident.value_offset)))) {
1547                ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
1548                                "after the attribute value.");
1549                goto unm_err_out;
1550        }
1551        /*
1552         * Compressed/encrypted/sparse index root is not allowed, except for
1553         * directories of course but those are not dealt with here.
1554         */
1555        if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
1556                        ATTR_IS_SPARSE)) {
1557                ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
1558                                "root attribute.");
1559                goto unm_err_out;
1560        }
1561        ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));
1562        ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
1563        if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
1564                ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt.");
1565                goto unm_err_out;
1566        }
1567        index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
1568        if (index_end > ir_end) {
1569                ntfs_error(vi->i_sb, "Index is corrupt.");
1570                goto unm_err_out;
1571        }
1572        if (ir->type) {
1573                ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).",
1574                                le32_to_cpu(ir->type));
1575                goto unm_err_out;
1576        }
1577        ni->itype.index.collation_rule = ir->collation_rule;
1578        ntfs_debug("Index collation rule is 0x%x.",
1579                        le32_to_cpu(ir->collation_rule));
1580        ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
1581        if (!is_power_of_2(ni->itype.index.block_size)) {
1582                ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
1583                                "two.", ni->itype.index.block_size);
1584                goto unm_err_out;
1585        }
1586        if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
1587                ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE "
1588                                "(%ld) is not supported.  Sorry.",
1589                                ni->itype.index.block_size, PAGE_CACHE_SIZE);
1590                err = -EOPNOTSUPP;
1591                goto unm_err_out;
1592        }
1593        if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
1594                ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE "
1595                                "(%i) is not supported.  Sorry.",
1596                                ni->itype.index.block_size, NTFS_BLOCK_SIZE);
1597                err = -EOPNOTSUPP;
1598                goto unm_err_out;
1599        }
1600        ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1;
1601        /* Determine the size of a vcn in the index. */
1602        if (vol->cluster_size <= ni->itype.index.block_size) {
1603                ni->itype.index.vcn_size = vol->cluster_size;
1604                ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
1605        } else {
1606                ni->itype.index.vcn_size = vol->sector_size;
1607                ni->itype.index.vcn_size_bits = vol->sector_size_bits;
1608        }
1609        /* Check for presence of index allocation attribute. */
1610        if (!(ir->index.flags & LARGE_INDEX)) {
1611                /* No index allocation. */
1612                vi->i_size = ni->initialized_size = ni->allocated_size = 0;
1613                /* We are done with the mft record, so we release it. */
1614                ntfs_attr_put_search_ctx(ctx);
1615                unmap_mft_record(base_ni);
1616                m = NULL;
1617                ctx = NULL;
1618                goto skip_large_index_stuff;
1619        } /* LARGE_INDEX:  Index allocation present.  Setup state. */
1620        NInoSetIndexAllocPresent(ni);
1621        /* Find index allocation attribute. */
1622        ntfs_attr_reinit_search_ctx(ctx);
1623        err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len,
1624                        CASE_SENSITIVE, 0, NULL, 0, ctx);
1625        if (unlikely(err)) {
1626                if (err == -ENOENT)
1627                        ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1628                                        "not present but $INDEX_ROOT "
1629                                        "indicated it is.");
1630                else
1631                        ntfs_error(vi->i_sb, "Failed to lookup "
1632                                        "$INDEX_ALLOCATION attribute.");
1633                goto unm_err_out;
1634        }
1635        a = ctx->attr;
1636        if (!a->non_resident) {
1637                ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1638                                "resident.");
1639                goto unm_err_out;
1640        }
1641        /*
1642         * Ensure the attribute name is placed before the mapping pairs array.
1643         */
1644        if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1645                        le16_to_cpu(
1646                        a->data.non_resident.mapping_pairs_offset)))) {
1647                ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
1648                                "placed after the mapping pairs array.");
1649                goto unm_err_out;
1650        }
1651        if (a->flags & ATTR_IS_ENCRYPTED) {
1652                ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1653                                "encrypted.");
1654                goto unm_err_out;
1655        }
1656        if (a->flags & ATTR_IS_SPARSE) {
1657                ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
1658                goto unm_err_out;
1659        }
1660        if (a->flags & ATTR_COMPRESSION_MASK) {
1661                ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1662                                "compressed.");
1663                goto unm_err_out;
1664        }
1665        if (a->data.non_resident.lowest_vcn) {
1666                ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
1667                                "attribute has non zero lowest_vcn.");
1668                goto unm_err_out;
1669        }
1670        vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
1671        ni->initialized_size = sle64_to_cpu(
1672                        a->data.non_resident.initialized_size);
1673        ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size);
1674        /*
1675         * We are done with the mft record, so we release it.  Otherwise
1676         * we would deadlock in ntfs_attr_iget().
1677         */
1678        ntfs_attr_put_search_ctx(ctx);
1679        unmap_mft_record(base_ni);
1680        m = NULL;
1681        ctx = NULL;
1682        /* Get the index bitmap attribute inode. */
1683        bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
1684        if (IS_ERR(bvi)) {
1685                ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
1686                err = PTR_ERR(bvi);
1687                goto unm_err_out;
1688        }
1689        bni = NTFS_I(bvi);
1690        if (NInoCompressed(bni) || NInoEncrypted(bni) ||
1691                        NInoSparse(bni)) {
1692                ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
1693                                "encrypted and/or sparse.");
1694                goto iput_unm_err_out;
1695        }
1696        /* Consistency check bitmap size vs. index allocation size. */
1697        bvi_size = i_size_read(bvi);
1698        if ((bvi_size << 3) < (vi->i_size >> ni->itype.index.block_size_bits)) {
1699                ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for "
1700                                "index allocation (0x%llx).", bvi_size << 3,
1701                                vi->i_size);
1702                goto iput_unm_err_out;
1703        }
1704        iput(bvi);
1705skip_large_index_stuff:
1706        /* Setup the operations for this index inode. */
1707        vi->i_op = NULL;
1708        vi->i_fop = NULL;
1709        vi->i_mapping->a_ops = &ntfs_mst_aops;
1710        vi->i_blocks = ni->allocated_size >> 9;
1711        /*
1712         * Make sure the base inode doesn't go away and attach it to the
1713         * index inode.
1714         */
1715        igrab(base_vi);
1716        ni->ext.base_ntfs_ino = base_ni;
1717        ni->nr_extents = -1;
1718
1719        ntfs_debug("Done.");
1720        return 0;
1721iput_unm_err_out:
1722        iput(bvi);
1723unm_err_out:
1724        if (!err)
1725                err = -EIO;
1726        if (ctx)
1727                ntfs_attr_put_search_ctx(ctx);
1728        if (m)
1729                unmap_mft_record(base_ni);
1730err_out:
1731        ntfs_error(vi->i_sb, "Failed with error code %i while reading index "
1732                        "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino,
1733                        ni->name_len);
1734        make_bad_inode(vi);
1735        if (err != -EOPNOTSUPP && err != -ENOMEM)
1736                NVolSetErrors(vol);
1737        return err;
1738}
1739
1740/*
1741 * The MFT inode has special locking, so teach the lock validator
1742 * about this by splitting off the locking rules of the MFT from
1743 * the locking rules of other inodes. The MFT inode can never be
1744 * accessed from the VFS side (or even internally), only by the
1745 * map_mft functions.
1746 */
1747static struct lock_class_key mft_ni_runlist_lock_key, mft_ni_mrec_lock_key;
1748
1749/**
1750 * ntfs_read_inode_mount - special read_inode for mount time use only
1751 * @vi:         inode to read
1752 *
1753 * Read inode FILE_MFT at mount time, only called with super_block lock
1754 * held from within the read_super() code path.
1755 *
1756 * This function exists because when it is called the page cache for $MFT/$DATA
1757 * is not initialized and hence we cannot get at the contents of mft records
1758 * by calling map_mft_record*().
1759 *
1760 * Further it needs to cope with the circular references problem, i.e. cannot
1761 * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because
1762 * we do not know where the other extent mft records are yet and again, because
1763 * we cannot call map_mft_record*() yet.  Obviously this applies only when an
1764 * attribute list is actually present in $MFT inode.
1765 *
1766 * We solve these problems by starting with the $DATA attribute before anything
1767 * else and iterating using ntfs_attr_lookup($DATA) over all extents.  As each
1768 * extent is found, we ntfs_mapping_pairs_decompress() including the implied
1769 * ntfs_runlists_merge().  Each step of the iteration necessarily provides
1770 * sufficient information for the next step to complete.
1771 *
1772 * This should work but there are two possible pit falls (see inline comments
1773 * below), but only time will tell if they are real pits or just smoke...
1774 */
1775int ntfs_read_inode_mount(struct inode *vi)
1776{
1777        VCN next_vcn, last_vcn, highest_vcn;
1778        s64 block;
1779        struct super_block *sb = vi->i_sb;
1780        ntfs_volume *vol = NTFS_SB(sb);
1781        struct buffer_head *bh;
1782        ntfs_inode *ni;
1783        MFT_RECORD *m = NULL;
1784        ATTR_RECORD *a;
1785        ntfs_attr_search_ctx *ctx;
1786        unsigned int i, nr_blocks;
1787        int err;
1788
1789        ntfs_debug("Entering.");
1790
1791        /* Initialize the ntfs specific part of @vi. */
1792        ntfs_init_big_inode(vi);
1793
1794        ni = NTFS_I(vi);
1795
1796        /* Setup the data attribute. It is special as it is mst protected. */
1797        NInoSetNonResident(ni);
1798        NInoSetMstProtected(ni);
1799        NInoSetSparseDisabled(ni);
1800        ni->type = AT_DATA;
1801        ni->name = NULL;
1802        ni->name_len = 0;
1803        /*
1804         * This sets up our little cheat allowing us to reuse the async read io
1805         * completion handler for directories.
1806         */
1807        ni->itype.index.block_size = vol->mft_record_size;
1808        ni->itype.index.block_size_bits = vol->mft_record_size_bits;
1809
1810        /* Very important! Needed to be able to call map_mft_record*(). */
1811        vol->mft_ino = vi;
1812
1813        /* Allocate enough memory to read the first mft record. */
1814        if (vol->mft_record_size > 64 * 1024) {
1815                ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).",
1816                                vol->mft_record_size);
1817                goto err_out;
1818        }
1819        i = vol->mft_record_size;
1820        if (i < sb->s_blocksize)
1821                i = sb->s_blocksize;
1822        m = (MFT_RECORD*)ntfs_malloc_nofs(i);
1823        if (!m) {
1824                ntfs_error(sb, "Failed to allocate buffer for $MFT record 0.");
1825                goto err_out;
1826        }
1827
1828        /* Determine the first block of the $MFT/$DATA attribute. */
1829        block = vol->mft_lcn << vol->cluster_size_bits >>
1830                        sb->s_blocksize_bits;
1831        nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits;
1832        if (!nr_blocks)
1833                nr_blocks = 1;
1834
1835        /* Load $MFT/$DATA's first mft record. */
1836        for (i = 0; i < nr_blocks; i++) {
1837                bh = sb_bread(sb, block++);
1838                if (!bh) {
1839                        ntfs_error(sb, "Device read failed.");
1840                        goto err_out;
1841                }
1842                memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data,
1843                                sb->s_blocksize);
1844                brelse(bh);
1845        }
1846
1847        /* Apply the mst fixups. */
1848        if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
1849                /* FIXME: Try to use the $MFTMirr now. */
1850                ntfs_error(sb, "MST fixup failed. $MFT is corrupt.");
1851                goto err_out;
1852        }
1853
1854        /* Need this to sanity check attribute list references to $MFT. */
1855        vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
1856
1857        /* Provides readpage() and sync_page() for map_mft_record(). */
1858        vi->i_mapping->a_ops = &ntfs_mst_aops;
1859
1860        ctx = ntfs_attr_get_search_ctx(ni, m);
1861        if (!ctx) {
1862                err = -ENOMEM;
1863                goto err_out;
1864        }
1865
1866        /* Find the attribute list attribute if present. */
1867        err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
1868        if (err) {
1869                if (unlikely(err != -ENOENT)) {
1870                        ntfs_error(sb, "Failed to lookup attribute list "
1871                                        "attribute. You should run chkdsk.");
1872                        goto put_err_out;
1873                }
1874        } else /* if (!err) */ {
1875                ATTR_LIST_ENTRY *al_entry, *next_al_entry;
1876                u8 *al_end;
1877                static const char *es = "  Not allowed.  $MFT is corrupt.  "
1878                                "You should run chkdsk.";
1879
1880                ntfs_debug("Attribute list attribute found in $MFT.");
1881                NInoSetAttrList(ni);
1882                a = ctx->attr;
1883                if (a->flags & ATTR_COMPRESSION_MASK) {
1884                        ntfs_error(sb, "Attribute list attribute is "
1885                                        "compressed.%s", es);
1886                        goto put_err_out;
1887                }
1888                if (a->flags & ATTR_IS_ENCRYPTED ||
1889                                a->flags & ATTR_IS_SPARSE) {
1890                        if (a->non_resident) {
1891                                ntfs_error(sb, "Non-resident attribute list "
1892                                                "attribute is encrypted/"
1893                                                "sparse.%s", es);
1894                                goto put_err_out;
1895                        }
1896                        ntfs_warning(sb, "Resident attribute list attribute "
1897                                        "in $MFT system file is marked "
1898                                        "encrypted/sparse which is not true.  "
1899                                        "However, Windows allows this and "
1900                                        "chkdsk does not detect or correct it "
1901                                        "so we will just ignore the invalid "
1902                                        "flags and pretend they are not set.");
1903                }
1904                /* Now allocate memory for the attribute list. */
1905                ni->attr_list_size = (u32)ntfs_attr_size(a);
1906                ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
1907                if (!ni->attr_list) {
1908                        ntfs_error(sb, "Not enough memory to allocate buffer "
1909                                        "for attribute list.");
1910                        goto put_err_out;
1911                }
1912                if (a->non_resident) {
1913                        NInoSetAttrListNonResident(ni);
1914                        if (a->data.non_resident.lowest_vcn) {
1915                                ntfs_error(sb, "Attribute list has non zero "
1916                                                "lowest_vcn. $MFT is corrupt. "
1917                                                "You should run chkdsk.");
1918                                goto put_err_out;
1919                        }
1920                        /* Setup the runlist. */
1921                        ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
1922                                        a, NULL);
1923                        if (IS_ERR(ni->attr_list_rl.rl)) {
1924                                err = PTR_ERR(ni->attr_list_rl.rl);
1925                                ni->attr_list_rl.rl = NULL;
1926                                ntfs_error(sb, "Mapping pairs decompression "
1927                                                "failed with error code %i.",
1928                                                -err);
1929                                goto put_err_out;
1930                        }
1931                        /* Now load the attribute list. */
1932                        if ((err = load_attribute_list(vol, &ni->attr_list_rl,
1933                                        ni->attr_list, ni->attr_list_size,
1934                                        sle64_to_cpu(a->data.
1935                                        non_resident.initialized_size)))) {
1936                                ntfs_error(sb, "Failed to load attribute list "
1937                                                "attribute with error code %i.",
1938                                                -err);
1939                                goto put_err_out;
1940                        }
1941                } else /* if (!ctx.attr->non_resident) */ {
1942                        if ((u8*)a + le16_to_cpu(
1943                                        a->data.resident.value_offset) +
1944                                        le32_to_cpu(
1945                                        a->data.resident.value_length) >
1946                                        (u8*)ctx->mrec + vol->mft_record_size) {
1947                                ntfs_error(sb, "Corrupt attribute list "
1948                                                "attribute.");
1949                                goto put_err_out;
1950                        }
1951                        /* Now copy the attribute list. */
1952                        memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
1953                                        a->data.resident.value_offset),
1954                                        le32_to_cpu(
1955                                        a->data.resident.value_length));
1956                }
1957                /* The attribute list is now setup in memory. */
1958                /*
1959                 * FIXME: I don't know if this case is actually possible.
1960                 * According to logic it is not possible but I have seen too
1961                 * many weird things in MS software to rely on logic... Thus we
1962                 * perform a manual search and make sure the first $MFT/$DATA
1963                 * extent is in the base inode. If it is not we abort with an
1964                 * error and if we ever see a report of this error we will need
1965                 * to do some magic in order to have the necessary mft record
1966                 * loaded and in the right place in the page cache. But
1967                 * hopefully logic will prevail and this never happens...
1968                 */
1969                al_entry = (ATTR_LIST_ENTRY*)ni->attr_list;
1970                al_end = (u8*)al_entry + ni->attr_list_size;
1971                for (;; al_entry = next_al_entry) {
1972                        /* Out of bounds check. */
1973                        if ((u8*)al_entry < ni->attr_list ||
1974                                        (u8*)al_entry > al_end)
1975                                goto em_put_err_out;
1976                        /* Catch the end of the attribute list. */
1977                        if ((u8*)al_entry == al_end)
1978                                goto em_put_err_out;
1979                        if (!al_entry->length)
1980                                goto em_put_err_out;
1981                        if ((u8*)al_entry + 6 > al_end || (u8*)al_entry +
1982                                        le16_to_cpu(al_entry->length) > al_end)
1983                                goto em_put_err_out;
1984                        next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry +
1985                                        le16_to_cpu(al_entry->length));
1986                        if (le32_to_cpu(al_entry->type) > le32_to_cpu(AT_DATA))
1987                                goto em_put_err_out;
1988                        if (AT_DATA != al_entry->type)
1989                                continue;
1990                        /* We want an unnamed attribute. */
1991                        if (al_entry->name_length)
1992                                goto em_put_err_out;
1993                        /* Want the first entry, i.e. lowest_vcn == 0. */
1994                        if (al_entry->lowest_vcn)
1995                                goto em_put_err_out;
1996                        /* First entry has to be in the base mft record. */
1997                        if (MREF_LE(al_entry->mft_reference) != vi->i_ino) {
1998                                /* MFT references do not match, logic fails. */
1999                                ntfs_error(sb, "BUG: The first $DATA extent "
2000                                                "of $MFT is not in the base "
2001                                                "mft record. Please report "
2002                                                "you saw this message to "
2003                                                "linux-ntfs-dev@lists."
2004                                                "sourceforge.net");
2005                                goto put_err_out;
2006                        } else {
2007                                /* Sequence numbers must match. */
2008                                if (MSEQNO_LE(al_entry->mft_reference) !=
2009                                                ni->seq_no)
2010                                        goto em_put_err_out;
2011                                /* Got it. All is ok. We can stop now. */
2012                                break;
2013                        }
2014                }
2015        }
2016
2017        ntfs_attr_reinit_search_ctx(ctx);
2018
2019        /* Now load all attribute extents. */
2020        a = NULL;
2021        next_vcn = last_vcn = highest_vcn = 0;
2022        while (!(err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, next_vcn, NULL, 0,
2023                        ctx))) {
2024                runlist_element *nrl;
2025
2026                /* Cache the current attribute. */
2027                a = ctx->attr;
2028                /* $MFT must be non-resident. */
2029                if (!a->non_resident) {
2030                        ntfs_error(sb, "$MFT must be non-resident but a "
2031                                        "resident extent was found. $MFT is "
2032                                        "corrupt. Run chkdsk.");
2033                        goto put_err_out;
2034                }
2035                /* $MFT must be uncompressed and unencrypted. */
2036                if (a->flags & ATTR_COMPRESSION_MASK ||
2037                                a->flags & ATTR_IS_ENCRYPTED ||
2038                                a->flags & ATTR_IS_SPARSE) {
2039                        ntfs_error(sb, "$MFT must be uncompressed, "
2040                                        "non-sparse, and unencrypted but a "
2041                                        "compressed/sparse/encrypted extent "
2042                                        "was found. $MFT is corrupt. Run "
2043                                        "chkdsk.");
2044                        goto put_err_out;
2045                }
2046                /*
2047                 * Decompress the mapping pairs array of this extent and merge
2048                 * the result into the existing runlist. No need for locking
2049                 * as we have exclusive access to the inode at this time and we
2050                 * are a mount in progress task, too.
2051                 */
2052                nrl = ntfs_mapping_pairs_decompress(vol, a, ni->runlist.rl);
2053                if (IS_ERR(nrl)) {
2054                        ntfs_error(sb, "ntfs_mapping_pairs_decompress() "
2055                                        "failed with error code %ld.  $MFT is "
2056                                        "corrupt.", PTR_ERR(nrl));
2057                        goto put_err_out;
2058                }
2059                ni->runlist.rl = nrl;
2060
2061                /* Are we in the first extent? */
2062                if (!next_vcn) {
2063                        if (a->data.non_resident.lowest_vcn) {
2064                                ntfs_error(sb, "First extent of $DATA "
2065                                                "attribute has non zero "
2066                                                "lowest_vcn. $MFT is corrupt. "
2067                                                "You should run chkdsk.");
2068                                goto put_err_out;
2069                        }
2070                        /* Get the last vcn in the $DATA attribute. */
2071                        last_vcn = sle64_to_cpu(
2072                                        a->data.non_resident.allocated_size)
2073                                        >> vol->cluster_size_bits;
2074                        /* Fill in the inode size. */
2075                        vi->i_size = sle64_to_cpu(
2076                                        a->data.non_resident.data_size);
2077                        ni->initialized_size = sle64_to_cpu(
2078                                        a->data.non_resident.initialized_size);
2079                        ni->allocated_size = sle64_to_cpu(
2080                                        a->data.non_resident.allocated_size);
2081                        /*
2082                         * Verify the number of mft records does not exceed
2083                         * 2^32 - 1.
2084                         */
2085                        if ((vi->i_size >> vol->mft_record_size_bits) >=
2086                                        (1ULL << 32)) {
2087                                ntfs_error(sb, "$MFT is too big! Aborting.");
2088                                goto put_err_out;
2089                        }
2090                        /*
2091                         * We have got the first extent of the runlist for
2092                         * $MFT which means it is now relatively safe to call
2093                         * the normal ntfs_read_inode() function.
2094                         * Complete reading the inode, this will actually
2095                         * re-read the mft record for $MFT, this time entering
2096                         * it into the page cache with which we complete the
2097                         * kick start of the volume. It should be safe to do
2098                         * this now as the first extent of $MFT/$DATA is
2099                         * already known and we would hope that we don't need
2100                         * further extents in order to find the other
2101                         * attributes belonging to $MFT. Only time will tell if
2102                         * this is really the case. If not we will have to play
2103                         * magic at this point, possibly duplicating a lot of
2104                         * ntfs_read_inode() at this point. We will need to
2105                         * ensure we do enough of its work to be able to call
2106                         * ntfs_read_inode() on extents of $MFT/$DATA. But lets
2107                         * hope this never happens...
2108                         */
2109                        ntfs_read_locked_inode(vi);
2110                        if (is_bad_inode(vi)) {
2111                                ntfs_error(sb, "ntfs_read_inode() of $MFT "
2112                                                "failed. BUG or corrupt $MFT. "
2113                                                "Run chkdsk and if no errors "
2114                                                "are found, please report you "
2115                                                "saw this message to "
2116                                                "linux-ntfs-dev@lists."
2117                                                "sourceforge.net");
2118                                ntfs_attr_put_search_ctx(ctx);
2119                                /* Revert to the safe super operations. */
2120                                ntfs_free(m);
2121                                return -1;
2122                        }
2123                        /*
2124                         * Re-initialize some specifics about $MFT's inode as
2125                         * ntfs_read_inode() will have set up the default ones.
2126                         */
2127                        /* Set uid and gid to root. */
2128                        vi->i_uid = GLOBAL_ROOT_UID;
2129                        vi->i_gid = GLOBAL_ROOT_GID;
2130                        /* Regular file. No access for anyone. */
2131                        vi->i_mode = S_IFREG;
2132                        /* No VFS initiated operations allowed for $MFT. */
2133                        vi->i_op = &ntfs_empty_inode_ops;
2134                        vi->i_fop = &ntfs_empty_file_ops;
2135                }
2136
2137                /* Get the lowest vcn for the next extent. */
2138                highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
2139                next_vcn = highest_vcn + 1;
2140
2141                /* Only one extent or error, which we catch below. */
2142                if (next_vcn <= 0)
2143                        break;
2144
2145                /* Avoid endless loops due to corruption. */
2146                if (next_vcn < sle64_to_cpu(
2147                                a->data.non_resident.lowest_vcn)) {
2148                        ntfs_error(sb, "$MFT has corrupt attribute list "
2149                                        "attribute. Run chkdsk.");
2150                        goto put_err_out;
2151                }
2152        }
2153        if (err != -ENOENT) {
2154                ntfs_error(sb, "Failed to lookup $MFT/$DATA attribute extent. "
2155                                "$MFT is corrupt. Run chkdsk.");
2156                goto put_err_out;
2157        }
2158        if (!a) {
2159                ntfs_error(sb, "$MFT/$DATA attribute not found. $MFT is "
2160                                "corrupt. Run chkdsk.");
2161                goto put_err_out;
2162        }
2163        if (highest_vcn && highest_vcn != last_vcn - 1) {
2164                ntfs_error(sb, "Failed to load the complete runlist for "
2165                                "$MFT/$DATA. Driver bug or corrupt $MFT. "
2166                                "Run chkdsk.");
2167                ntfs_debug("highest_vcn = 0x%llx, last_vcn - 1 = 0x%llx",
2168                                (unsigned long long)highest_vcn,
2169                                (unsigned long long)last_vcn - 1);
2170                goto put_err_out;
2171        }
2172        ntfs_attr_put_search_ctx(ctx);
2173        ntfs_debug("Done.");
2174        ntfs_free(m);
2175
2176        /*
2177         * Split the locking rules of the MFT inode from the
2178         * locking rules of other inodes:
2179         */
2180        lockdep_set_class(&ni->runlist.lock, &mft_ni_runlist_lock_key);
2181        lockdep_set_class(&ni->mrec_lock, &mft_ni_mrec_lock_key);
2182
2183        return 0;
2184
2185em_put_err_out:
2186        ntfs_error(sb, "Couldn't find first extent of $DATA attribute in "
2187                        "attribute list. $MFT is corrupt. Run chkdsk.");
2188put_err_out:
2189        ntfs_attr_put_search_ctx(ctx);
2190err_out:
2191        ntfs_error(sb, "Failed. Marking inode as bad.");
2192        make_bad_inode(vi);
2193        ntfs_free(m);
2194        return -1;
2195}
2196
2197static void __ntfs_clear_inode(ntfs_inode *ni)
2198{
2199        /* Free all alocated memory. */
2200        down_write(&ni->runlist.lock);
2201        if (ni->runlist.rl) {
2202                ntfs_free(ni->runlist.rl);
2203                ni->runlist.rl = NULL;
2204        }
2205        up_write(&ni->runlist.lock);
2206
2207        if (ni->attr_list) {
2208                ntfs_free(ni->attr_list);
2209                ni->attr_list = NULL;
2210        }
2211
2212        down_write(&ni->attr_list_rl.lock);
2213        if (ni->attr_list_rl.rl) {
2214                ntfs_free(ni->attr_list_rl.rl);
2215                ni->attr_list_rl.rl = NULL;
2216        }
2217        up_write(&ni->attr_list_rl.lock);
2218
2219        if (ni->name_len && ni->name != I30) {
2220                /* Catch bugs... */
2221                BUG_ON(!ni->name);
2222                kfree(ni->name);
2223        }
2224}
2225
2226void ntfs_clear_extent_inode(ntfs_inode *ni)
2227{
2228        ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
2229
2230        BUG_ON(NInoAttr(ni));
2231        BUG_ON(ni->nr_extents != -1);
2232
2233#ifdef NTFS_RW
2234        if (NInoDirty(ni)) {
2235                if (!is_bad_inode(VFS_I(ni->ext.base_ntfs_ino)))
2236                        ntfs_error(ni->vol->sb, "Clearing dirty extent inode!  "
2237                                        "Losing data!  This is a BUG!!!");
2238                // FIXME:  Do something!!!
2239        }
2240#endif /* NTFS_RW */
2241
2242        __ntfs_clear_inode(ni);
2243
2244        /* Bye, bye... */
2245        ntfs_destroy_extent_inode(ni);
2246}
2247
2248/**
2249 * ntfs_evict_big_inode - clean up the ntfs specific part of an inode
2250 * @vi:         vfs inode pending annihilation
2251 *
2252 * When the VFS is going to remove an inode from memory, ntfs_clear_big_inode()
2253 * is called, which deallocates all memory belonging to the NTFS specific part
2254 * of the inode and returns.
2255 *
2256 * If the MFT record is dirty, we commit it before doing anything else.
2257 */
2258void ntfs_evict_big_inode(struct inode *vi)
2259{
2260        ntfs_inode *ni = NTFS_I(vi);
2261
2262        truncate_inode_pages(&vi->i_data, 0);
2263        clear_inode(vi);
2264
2265#ifdef NTFS_RW
2266        if (NInoDirty(ni)) {
2267                bool was_bad = (is_bad_inode(vi));
2268
2269                /* Committing the inode also commits all extent inodes. */
2270                ntfs_commit_inode(vi);
2271
2272                if (!was_bad && (is_bad_inode(vi) || NInoDirty(ni))) {
2273                        ntfs_error(vi->i_sb, "Failed to commit dirty inode "
2274                                        "0x%lx.  Losing data!", vi->i_ino);
2275                        // FIXME:  Do something!!!
2276                }
2277        }
2278#endif /* NTFS_RW */
2279
2280        /* No need to lock at this stage as no one else has a reference. */
2281        if (ni->nr_extents > 0) {
2282                int i;
2283
2284                for (i = 0; i < ni->nr_extents; i++)
2285                        ntfs_clear_extent_inode(ni->ext.extent_ntfs_inos[i]);
2286                kfree(ni->ext.extent_ntfs_inos);
2287        }
2288
2289        __ntfs_clear_inode(ni);
2290
2291        if (NInoAttr(ni)) {
2292                /* Release the base inode if we are holding it. */
2293                if (ni->nr_extents == -1) {
2294                        iput(VFS_I(ni->ext.base_ntfs_ino));
2295                        ni->nr_extents = 0;
2296                        ni->ext.base_ntfs_ino = NULL;
2297                }
2298        }
2299        return;
2300}
2301
2302/**
2303 * ntfs_show_options - show mount options in /proc/mounts
2304 * @sf:         seq_file in which to write our mount options
2305 * @root:       root of the mounted tree whose mount options to display
2306 *
2307 * Called by the VFS once for each mounted ntfs volume when someone reads
2308 * /proc/mounts in order to display the NTFS specific mount options of each
2309 * mount. The mount options of fs specified by @root are written to the seq file
2310 * @sf and success is returned.
2311 */
2312int ntfs_show_options(struct seq_file *sf, struct dentry *root)
2313{
2314        ntfs_volume *vol = NTFS_SB(root->d_sb);
2315        int i;
2316
2317        seq_printf(sf, ",uid=%i", from_kuid_munged(&init_user_ns, vol->uid));
2318        seq_printf(sf, ",gid=%i", from_kgid_munged(&init_user_ns, vol->gid));
2319        if (vol->fmask == vol->dmask)
2320                seq_printf(sf, ",umask=0%o", vol->fmask);
2321        else {
2322                seq_printf(sf, ",fmask=0%o", vol->fmask);
2323                seq_printf(sf, ",dmask=0%o", vol->dmask);
2324        }
2325        seq_printf(sf, ",nls=%s", vol->nls_map->charset);
2326        if (NVolCaseSensitive(vol))
2327                seq_printf(sf, ",case_sensitive");
2328        if (NVolShowSystemFiles(vol))
2329                seq_printf(sf, ",show_sys_files");
2330        if (!NVolSparseEnabled(vol))
2331                seq_printf(sf, ",disable_sparse");
2332        for (i = 0; on_errors_arr[i].val; i++) {
2333                if (on_errors_arr[i].val & vol->on_errors)
2334                        seq_printf(sf, ",errors=%s", on_errors_arr[i].str);
2335        }
2336        seq_printf(sf, ",mft_zone_multiplier=%i", vol->mft_zone_multiplier);
2337        return 0;
2338}
2339
2340#ifdef NTFS_RW
2341
2342static const char *es = "  Leaving inconsistent metadata.  Unmount and run "
2343                "chkdsk.";
2344
2345/**
2346 * ntfs_truncate - called when the i_size of an ntfs inode is changed
2347 * @vi:         inode for which the i_size was changed
2348 *
2349 * We only support i_size changes for normal files at present, i.e. not
2350 * compressed and not encrypted.  This is enforced in ntfs_setattr(), see
2351 * below.
2352 *
2353 * The kernel guarantees that @vi is a regular file (S_ISREG() is true) and
2354 * that the change is allowed.
2355 *
2356 * This implies for us that @vi is a file inode rather than a directory, index,
2357 * or attribute inode as well as that @vi is a base inode.
2358 *
2359 * Returns 0 on success or -errno on error.
2360 *
2361 * Called with ->i_mutex held.
2362 */
2363int ntfs_truncate(struct inode *vi)
2364{
2365        s64 new_size, old_size, nr_freed, new_alloc_size, old_alloc_size;
2366        VCN highest_vcn;
2367        unsigned long flags;
2368        ntfs_inode *base_ni, *ni = NTFS_I(vi);
2369        ntfs_volume *vol = ni->vol;
2370        ntfs_attr_search_ctx *ctx;
2371        MFT_RECORD *m;
2372        ATTR_RECORD *a;
2373        const char *te = "  Leaving file length out of sync with i_size.";
2374        int err, mp_size, size_change, alloc_change;
2375        u32 attr_len;
2376
2377        ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
2378        BUG_ON(NInoAttr(ni));
2379        BUG_ON(S_ISDIR(vi->i_mode));
2380        BUG_ON(NInoMstProtected(ni));
2381        BUG_ON(ni->nr_extents < 0);
2382retry_truncate:
2383        /*
2384         * Lock the runlist for writing and map the mft record to ensure it is
2385         * safe to mess with the attribute runlist and sizes.
2386         */
2387        down_write(&ni->runlist.lock);
2388        if (!NInoAttr(ni))
2389                base_ni = ni;
2390        else
2391                base_ni = ni->ext.base_ntfs_ino;
2392        m = map_mft_record(base_ni);
2393        if (IS_ERR(m)) {
2394                err = PTR_ERR(m);
2395                ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx "
2396                                "(error code %d).%s", vi->i_ino, err, te);
2397                ctx = NULL;
2398                m = NULL;
2399                goto old_bad_out;
2400        }
2401        ctx = ntfs_attr_get_search_ctx(base_ni, m);
2402        if (unlikely(!ctx)) {
2403                ntfs_error(vi->i_sb, "Failed to allocate a search context for "
2404                                "inode 0x%lx (not enough memory).%s",
2405                                vi->i_ino, te);
2406                err = -ENOMEM;
2407                goto old_bad_out;
2408        }
2409        err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
2410                        CASE_SENSITIVE, 0, NULL, 0, ctx);
2411        if (unlikely(err)) {
2412                if (err == -ENOENT) {
2413                        ntfs_error(vi->i_sb, "Open attribute is missing from "
2414                                        "mft record.  Inode 0x%lx is corrupt.  "
2415                                        "Run chkdsk.%s", vi->i_ino, te);
2416                        err = -EIO;
2417                } else
2418                        ntfs_error(vi->i_sb, "Failed to lookup attribute in "
2419                                        "inode 0x%lx (error code %d).%s",
2420                                        vi->i_ino, err, te);
2421                goto old_bad_out;
2422        }
2423        m = ctx->mrec;
2424        a = ctx->attr;
2425        /*
2426         * The i_size of the vfs inode is the new size for the attribute value.
2427         */
2428        new_size = i_size_read(vi);
2429        /* The current size of the attribute value is the old size. */
2430        old_size = ntfs_attr_size(a);
2431        /* Calculate the new allocated size. */
2432        if (NInoNonResident(ni))
2433                new_alloc_size = (new_size + vol->cluster_size - 1) &
2434                                ~(s64)vol->cluster_size_mask;
2435        else
2436                new_alloc_size = (new_size + 7) & ~7;
2437        /* The current allocated size is the old allocated size. */
2438        read_lock_irqsave(&ni->size_lock, flags);
2439        old_alloc_size = ni->allocated_size;
2440        read_unlock_irqrestore(&ni->size_lock, flags);
2441        /*
2442         * The change in the file size.  This will be 0 if no change, >0 if the
2443         * size is growing, and <0 if the size is shrinking.
2444         */
2445        size_change = -1;
2446        if (new_size - old_size >= 0) {
2447                size_change = 1;
2448                if (new_size == old_size)
2449                        size_change = 0;
2450        }
2451        /* As above for the allocated size. */
2452        alloc_change = -1;
2453        if (new_alloc_size - old_alloc_size >= 0) {
2454                alloc_change = 1;
2455                if (new_alloc_size == old_alloc_size)
2456                        alloc_change = 0;
2457        }
2458        /*
2459         * If neither the size nor the allocation are being changed there is
2460         * nothing to do.
2461         */
2462        if (!size_change && !alloc_change)
2463                goto unm_done;
2464        /* If the size is changing, check if new size is allowed in $AttrDef. */
2465        if (size_change) {
2466                err = ntfs_attr_size_bounds_check(vol, ni->type, new_size);
2467                if (unlikely(err)) {
2468                        if (err == -ERANGE) {
2469                                ntfs_error(vol->sb, "Truncate would cause the "
2470                                                "inode 0x%lx to %simum size "
2471                                                "for its attribute type "
2472                                                "(0x%x).  Aborting truncate.",
2473                                                vi->i_ino,
2474                                                new_size > old_size ? "exceed "
2475                                                "the max" : "go under the min",
2476                                                le32_to_cpu(ni->type));
2477                                err = -EFBIG;
2478                        } else {
2479                                ntfs_error(vol->sb, "Inode 0x%lx has unknown "
2480                                                "attribute type 0x%x.  "
2481                                                "Aborting truncate.",
2482                                                vi->i_ino,
2483                                                le32_to_cpu(ni->type));
2484                                err = -EIO;
2485                        }
2486                        /* Reset the vfs inode size to the old size. */
2487                        i_size_write(vi, old_size);
2488                        goto err_out;
2489                }
2490        }
2491        if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2492                ntfs_warning(vi->i_sb, "Changes in inode size are not "
2493                                "supported yet for %s files, ignoring.",
2494                                NInoCompressed(ni) ? "compressed" :
2495                                "encrypted");
2496                err = -EOPNOTSUPP;
2497                goto bad_out;
2498        }
2499        if (a->non_resident)
2500                goto do_non_resident_truncate;
2501        BUG_ON(NInoNonResident(ni));
2502        /* Resize the attribute record to best fit the new attribute size. */
2503        if (new_size < vol->mft_record_size &&
2504                        !ntfs_resident_attr_value_resize(m, a, new_size)) {
2505                /* The resize succeeded! */
2506                flush_dcache_mft_record_page(ctx->ntfs_ino);
2507                mark_mft_record_dirty(ctx->ntfs_ino);
2508                write_lock_irqsave(&ni->size_lock, flags);
2509                /* Update the sizes in the ntfs inode and all is done. */
2510                ni->allocated_size = le32_to_cpu(a->length) -
2511                                le16_to_cpu(a->data.resident.value_offset);
2512                /*
2513                 * Note ntfs_resident_attr_value_resize() has already done any
2514                 * necessary data clearing in the attribute record.  When the
2515                 * file is being shrunk vmtruncate() will already have cleared
2516                 * the top part of the last partial page, i.e. since this is
2517                 * the resident case this is the page with index 0.  However,
2518                 * when the file is being expanded, the page cache page data
2519                 * between the old data_size, i.e. old_size, and the new_size
2520                 * has not been zeroed.  Fortunately, we do not need to zero it
2521                 * either since on one hand it will either already be zero due
2522                 * to both readpage and writepage clearing partial page data
2523                 * beyond i_size in which case there is nothing to do or in the
2524                 * case of the file being mmap()ped at the same time, POSIX
2525                 * specifies that the behaviour is unspecified thus we do not
2526                 * have to do anything.  This means that in our implementation
2527                 * in the rare case that the file is mmap()ped and a write
2528                 * occurred into the mmap()ped region just beyond the file size
2529                 * and writepage has not yet been called to write out the page
2530                 * (which would clear the area beyond the file size) and we now
2531                 * extend the file size to incorporate this dirty region
2532                 * outside the file size, a write of the page would result in
2533                 * this data being written to disk instead of being cleared.
2534                 * Given both POSIX and the Linux mmap(2) man page specify that
2535                 * this corner case is undefined, we choose to leave it like
2536                 * that as this is much simpler for us as we cannot lock the
2537                 * relevant page now since we are holding too many ntfs locks
2538                 * which would result in a lock reversal deadlock.
2539                 */
2540                ni->initialized_size = new_size;
2541                write_unlock_irqrestore(&ni->size_lock, flags);
2542                goto unm_done;
2543        }
2544        /* If the above resize failed, this must be an attribute extension. */
2545        BUG_ON(size_change < 0);
2546        /*
2547         * We have to drop all the locks so we can call
2548         * ntfs_attr_make_non_resident().  This could be optimised by try-
2549         * locking the first page cache page and only if that fails dropping
2550         * the locks, locking the page, and redoing all the locking and
2551         * lookups.  While this would be a huge optimisation, it is not worth
2552         * it as this is definitely a slow code path as it only ever can happen
2553         * once for any given file.
2554         */
2555        ntfs_attr_put_search_ctx(ctx);
2556        unmap_mft_record(base_ni);
2557        up_write(&ni->runlist.lock);
2558        /*
2559         * Not enough space in the mft record, try to make the attribute
2560         * non-resident and if successful restart the truncation process.
2561         */
2562        err = ntfs_attr_make_non_resident(ni, old_size);
2563        if (likely(!err))
2564                goto retry_truncate;
2565        /*
2566         * Could not make non-resident.  If this is due to this not being
2567         * permitted for this attribute type or there not being enough space,
2568         * try to make other attributes non-resident.  Otherwise fail.
2569         */
2570        if (unlikely(err != -EPERM && err != -ENOSPC)) {
2571                ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, attribute "
2572                                "type 0x%x, because the conversion from "
2573                                "resident to non-resident attribute failed "
2574                                "with error code %i.", vi->i_ino,
2575                                (unsigned)le32_to_cpu(ni->type), err);
2576                if (err != -ENOMEM)
2577                        err = -EIO;
2578                goto conv_err_out;
2579        }
2580        /* TODO: Not implemented from here, abort. */
2581        if (err == -ENOSPC)
2582                ntfs_error(vol->sb, "Not enough space in the mft record/on "
2583                                "disk for the non-resident attribute value.  "
2584                                "This case is not implemented yet.");
2585        else /* if (err == -EPERM) */
2586                ntfs_error(vol->sb, "This attribute type may not be "
2587                                "non-resident.  This case is not implemented "
2588                                "yet.");
2589        err = -EOPNOTSUPP;
2590        goto conv_err_out;
2591#if 0
2592        // TODO: Attempt to make other attributes non-resident.
2593        if (!err)
2594                goto do_resident_extend;
2595        /*
2596         * Both the attribute list attribute and the standard information
2597         * attribute must remain in the base inode.  Thus, if this is one of
2598         * these attributes, we have to try to move other attributes out into
2599         * extent mft records instead.
2600         */
2601        if (ni->type == AT_ATTRIBUTE_LIST ||
2602                        ni->type == AT_STANDARD_INFORMATION) {
2603                // TODO: Attempt to move other attributes into extent mft
2604                // records.
2605                err = -EOPNOTSUPP;
2606                if (!err)
2607                        goto do_resident_extend;
2608                goto err_out;
2609        }
2610        // TODO: Attempt to move this attribute to an extent mft record, but
2611        // only if it is not already the only attribute in an mft record in
2612        // which case there would be nothing to gain.
2613        err = -EOPNOTSUPP;
2614        if (!err)
2615                goto do_resident_extend;
2616        /* There is nothing we can do to make enough space. )-: */
2617        goto err_out;
2618#endif
2619do_non_resident_truncate:
2620        BUG_ON(!NInoNonResident(ni));
2621        if (alloc_change < 0) {
2622                highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
2623                if (highest_vcn > 0 &&
2624                                old_alloc_size >> vol->cluster_size_bits >
2625                                highest_vcn + 1) {
2626                        /*
2627                         * This attribute has multiple extents.  Not yet
2628                         * supported.
2629                         */
2630                        ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, "
2631                                        "attribute type 0x%x, because the "
2632                                        "attribute is highly fragmented (it "
2633                                        "consists of multiple extents) and "
2634                                        "this case is not implemented yet.",
2635                                        vi->i_ino,
2636                                        (unsigned)le32_to_cpu(ni->type));
2637                        err = -EOPNOTSUPP;
2638                        goto bad_out;
2639                }
2640        }
2641        /*
2642         * If the size is shrinking, need to reduce the initialized_size and
2643         * the data_size before reducing the allocation.
2644         */
2645        if (size_change < 0) {
2646                /*
2647                 * Make the valid size smaller (i_size is already up-to-date).
2648                 */
2649                write_lock_irqsave(&ni->size_lock, flags);
2650                if (new_size < ni->initialized_size) {
2651                        ni->initialized_size = new_size;
2652                        a->data.non_resident.initialized_size =
2653                                        cpu_to_sle64(new_size);
2654                }
2655                a->data.non_resident.data_size = cpu_to_sle64(new_size);
2656                write_unlock_irqrestore(&ni->size_lock, flags);
2657                flush_dcache_mft_record_page(ctx->ntfs_ino);
2658                mark_mft_record_dirty(ctx->ntfs_ino);
2659                /* If the allocated size is not changing, we are done. */
2660                if (!alloc_change)
2661                        goto unm_done;
2662                /*
2663                 * If the size is shrinking it makes no sense for the
2664                 * allocation to be growing.
2665                 */
2666                BUG_ON(alloc_change > 0);
2667        } else /* if (size_change >= 0) */ {
2668                /*
2669                 * The file size is growing or staying the same but the
2670                 * allocation can be shrinking, growing or staying the same.
2671                 */
2672                if (alloc_change > 0) {
2673                        /*
2674                         * We need to extend the allocation and possibly update
2675                         * the data size.  If we are updating the data size,
2676                         * since we are not touching the initialized_size we do
2677                         * not need to worry about the actual data on disk.
2678                         * And as far as the page cache is concerned, there
2679                         * will be no pages beyond the old data size and any
2680                         * partial region in the last page between the old and
2681                         * new data size (or the end of the page if the new
2682                         * data size is outside the page) does not need to be
2683                         * modified as explained above for the resident
2684                         * attribute truncate case.  To do this, we simply drop
2685                         * the locks we hold and leave all the work to our
2686                         * friendly helper ntfs_attr_extend_allocation().
2687                         */
2688                        ntfs_attr_put_search_ctx(ctx);
2689                        unmap_mft_record(base_ni);
2690                        up_write(&ni->runlist.lock);
2691                        err = ntfs_attr_extend_allocation(ni, new_size,
2692                                        size_change > 0 ? new_size : -1, -1);
2693                        /*
2694                         * ntfs_attr_extend_allocation() will have done error
2695                         * output already.
2696                         */
2697                        goto done;
2698                }
2699                if (!alloc_change)
2700                        goto alloc_done;
2701        }
2702        /* alloc_change < 0 */
2703        /* Free the clusters. */
2704        nr_freed = ntfs_cluster_free(ni, new_alloc_size >>
2705                        vol->cluster_size_bits, -1, ctx);
2706        m = ctx->mrec;
2707        a = ctx->attr;
2708        if (unlikely(nr_freed < 0)) {
2709                ntfs_error(vol->sb, "Failed to release cluster(s) (error code "
2710                                "%lli).  Unmount and run chkdsk to recover "
2711                                "the lost cluster(s).", (long long)nr_freed);
2712                NVolSetErrors(vol);
2713                nr_freed = 0;
2714        }
2715        /* Truncate the runlist. */
2716        err = ntfs_rl_truncate_nolock(vol, &ni->runlist,
2717                        new_alloc_size >> vol->cluster_size_bits);
2718        /*
2719         * If the runlist truncation failed and/or the search context is no
2720         * longer valid, we cannot resize the attribute record or build the
2721         * mapping pairs array thus we mark the inode bad so that no access to
2722         * the freed clusters can happen.
2723         */
2724        if (unlikely(err || IS_ERR(m))) {
2725                ntfs_error(vol->sb, "Failed to %s (error code %li).%s",
2726                                IS_ERR(m) ?
2727                                "restore attribute search context" :
2728                                "truncate attribute runlist",
2729                                IS_ERR(m) ? PTR_ERR(m) : err, es);
2730                err = -EIO;
2731                goto bad_out;
2732        }
2733        /* Get the size for the shrunk mapping pairs array for the runlist. */
2734        mp_size = ntfs_get_size_for_mapping_pairs(vol, ni->runlist.rl, 0, -1);
2735        if (unlikely(mp_size <= 0)) {
2736                ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2737                                "attribute type 0x%x, because determining the "
2738                                "size for the mapping pairs failed with error "
2739                                "code %i.%s", vi->i_ino,
2740                                (unsigned)le32_to_cpu(ni->type), mp_size, es);
2741                err = -EIO;
2742                goto bad_out;
2743        }
2744        /*
2745         * Shrink the attribute record for the new mapping pairs array.  Note,
2746         * this cannot fail since we are making the attribute smaller thus by
2747         * definition there is enough space to do so.
2748         */
2749        attr_len = le32_to_cpu(a->length);
2750        err = ntfs_attr_record_resize(m, a, mp_size +
2751                        le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
2752        BUG_ON(err);
2753        /*
2754         * Generate the mapping pairs array directly into the attribute record.
2755         */
2756        err = ntfs_mapping_pairs_build(vol, (u8*)a +
2757                        le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
2758                        mp_size, ni->runlist.rl, 0, -1, NULL);
2759        if (unlikely(err)) {
2760                ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2761                                "attribute type 0x%x, because building the "
2762                                "mapping pairs failed with error code %i.%s",
2763                                vi->i_ino, (unsigned)le32_to_cpu(ni->type),
2764                                err, es);
2765                err = -EIO;
2766                goto bad_out;
2767        }
2768        /* Update the allocated/compressed size as well as the highest vcn. */
2769        a->data.non_resident.highest_vcn = cpu_to_sle64((new_alloc_size >>
2770                        vol->cluster_size_bits) - 1);
2771        write_lock_irqsave(&ni->size_lock, flags);
2772        ni->allocated_size = new_alloc_size;
2773        a->data.non_resident.allocated_size = cpu_to_sle64(new_alloc_size);
2774        if (NInoSparse(ni) || NInoCompressed(ni)) {
2775                if (nr_freed) {
2776                        ni->itype.compressed.size -= nr_freed <<
2777                                        vol->cluster_size_bits;
2778                        BUG_ON(ni->itype.compressed.size < 0);
2779                        a->data.non_resident.compressed_size = cpu_to_sle64(
2780                                        ni->itype.compressed.size);
2781                        vi->i_blocks = ni->itype.compressed.size >> 9;
2782                }
2783        } else
2784                vi->i_blocks = new_alloc_size >> 9;
2785        write_unlock_irqrestore(&ni->size_lock, flags);
2786        /*
2787         * We have shrunk the allocation.  If this is a shrinking truncate we
2788         * have already dealt with the initialized_size and the data_size above
2789         * and we are done.  If the truncate is only changing the allocation
2790         * and not the data_size, we are also done.  If this is an extending
2791         * truncate, need to extend the data_size now which is ensured by the
2792         * fact that @size_change is positive.
2793         */
2794alloc_done:
2795        /*
2796         * If the size is growing, need to update it now.  If it is shrinking,
2797         * we have already updated it above (before the allocation change).
2798         */
2799        if (size_change > 0)
2800                a->data.non_resident.data_size = cpu_to_sle64(new_size);
2801        /* Ensure the modified mft record is written out. */
2802        flush_dcache_mft_record_page(ctx->ntfs_ino);
2803        mark_mft_record_dirty(ctx->ntfs_ino);
2804unm_done:
2805        ntfs_attr_put_search_ctx(ctx);
2806        unmap_mft_record(base_ni);
2807        up_write(&ni->runlist.lock);
2808done:
2809        /* Update the mtime and ctime on the base inode. */
2810        /* normally ->truncate shouldn't update ctime or mtime,
2811         * but ntfs did before so it got a copy & paste version
2812         * of file_update_time.  one day someone should fix this
2813         * for real.
2814         */
2815        if (!IS_NOCMTIME(VFS_I(base_ni)) && !IS_RDONLY(VFS_I(base_ni))) {
2816                struct timespec now = current_fs_time(VFS_I(base_ni)->i_sb);
2817                int sync_it = 0;
2818
2819                if (!timespec_equal(&VFS_I(base_ni)->i_mtime, &now) ||
2820                    !timespec_equal(&VFS_I(base_ni)->i_ctime, &now))
2821                        sync_it = 1;
2822                VFS_I(base_ni)->i_mtime = now;
2823                VFS_I(base_ni)->i_ctime = now;
2824
2825                if (sync_it)
2826                        mark_inode_dirty_sync(VFS_I(base_ni));
2827        }
2828
2829        if (likely(!err)) {
2830                NInoClearTruncateFailed(ni);
2831                ntfs_debug("Done.");
2832        }
2833        return err;
2834old_bad_out:
2835        old_size = -1;
2836bad_out:
2837        if (err != -ENOMEM && err != -EOPNOTSUPP)
2838                NVolSetErrors(vol);
2839        if (err != -EOPNOTSUPP)
2840                NInoSetTruncateFailed(ni);
2841        else if (old_size >= 0)
2842                i_size_write(vi, old_size);
2843err_out:
2844        if (ctx)
2845                ntfs_attr_put_search_ctx(ctx);
2846        if (m)
2847                unmap_mft_record(base_ni);
2848        up_write(&ni->runlist.lock);
2849out:
2850        ntfs_debug("Failed.  Returning error code %i.", err);
2851        return err;
2852conv_err_out:
2853        if (err != -ENOMEM && err != -EOPNOTSUPP)
2854                NVolSetErrors(vol);
2855        if (err != -EOPNOTSUPP)
2856                NInoSetTruncateFailed(ni);
2857        else
2858                i_size_write(vi, old_size);
2859        goto out;
2860}
2861
2862/**
2863 * ntfs_truncate_vfs - wrapper for ntfs_truncate() that has no return value
2864 * @vi:         inode for which the i_size was changed
2865 *
2866 * Wrapper for ntfs_truncate() that has no return value.
2867 *
2868 * See ntfs_truncate() description above for details.
2869 */
2870#ifdef NTFS_RW
2871void ntfs_truncate_vfs(struct inode *vi) {
2872        ntfs_truncate(vi);
2873}
2874#endif
2875
2876/**
2877 * ntfs_setattr - called from notify_change() when an attribute is being changed
2878 * @dentry:     dentry whose attributes to change
2879 * @attr:       structure describing the attributes and the changes
2880 *
2881 * We have to trap VFS attempts to truncate the file described by @dentry as
2882 * soon as possible, because we do not implement changes in i_size yet.  So we
2883 * abort all i_size changes here.
2884 *
2885 * We also abort all changes of user, group, and mode as we do not implement
2886 * the NTFS ACLs yet.
2887 *
2888 * Called with ->i_mutex held.
2889 */
2890int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
2891{
2892        struct inode *vi = dentry->d_inode;
2893        int err;
2894        unsigned int ia_valid = attr->ia_valid;
2895
2896        err = inode_change_ok(vi, attr);
2897        if (err)
2898                goto out;
2899        /* We do not support NTFS ACLs yet. */
2900        if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) {
2901                ntfs_warning(vi->i_sb, "Changes in user/group/mode are not "
2902                                "supported yet, ignoring.");
2903                err = -EOPNOTSUPP;
2904                goto out;
2905        }
2906        if (ia_valid & ATTR_SIZE) {
2907                if (attr->ia_size != i_size_read(vi)) {
2908                        ntfs_inode *ni = NTFS_I(vi);
2909                        /*
2910                         * FIXME: For now we do not support resizing of
2911                         * compressed or encrypted files yet.
2912                         */
2913                        if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2914                                ntfs_warning(vi->i_sb, "Changes in inode size "
2915                                                "are not supported yet for "
2916                                                "%s files, ignoring.",
2917                                                NInoCompressed(ni) ?
2918                                                "compressed" : "encrypted");
2919                                err = -EOPNOTSUPP;
2920                        } else {
2921                                truncate_setsize(vi, attr->ia_size);
2922                                ntfs_truncate_vfs(vi);
2923                        }
2924                        if (err || ia_valid == ATTR_SIZE)
2925                                goto out;
2926                } else {
2927                        /*
2928                         * We skipped the truncate but must still update
2929                         * timestamps.
2930                         */
2931                        ia_valid |= ATTR_MTIME | ATTR_CTIME;
2932                }
2933        }
2934        if (ia_valid & ATTR_ATIME)
2935                vi->i_atime = timespec_trunc(attr->ia_atime,
2936                                vi->i_sb->s_time_gran);
2937        if (ia_valid & ATTR_MTIME)
2938                vi->i_mtime = timespec_trunc(attr->ia_mtime,
2939                                vi->i_sb->s_time_gran);
2940        if (ia_valid & ATTR_CTIME)
2941                vi->i_ctime = timespec_trunc(attr->ia_ctime,
2942                                vi->i_sb->s_time_gran);
2943        mark_inode_dirty(vi);
2944out:
2945        return err;
2946}
2947
2948/**
2949 * ntfs_write_inode - write out a dirty inode
2950 * @vi:         inode to write out
2951 * @sync:       if true, write out synchronously
2952 *
2953 * Write out a dirty inode to disk including any extent inodes if present.
2954 *
2955 * If @sync is true, commit the inode to disk and wait for io completion.  This
2956 * is done using write_mft_record().
2957 *
2958 * If @sync is false, just schedule the write to happen but do not wait for i/o
2959 * completion.  In 2.6 kernels, scheduling usually happens just by virtue of
2960 * marking the page (and in this case mft record) dirty but we do not implement
2961 * this yet as write_mft_record() largely ignores the @sync parameter and
2962 * always performs synchronous writes.
2963 *
2964 * Return 0 on success and -errno on error.
2965 */
2966int __ntfs_write_inode(struct inode *vi, int sync)
2967{
2968        sle64 nt;
2969        ntfs_inode *ni = NTFS_I(vi);
2970        ntfs_attr_search_ctx *ctx;
2971        MFT_RECORD *m;
2972        STANDARD_INFORMATION *si;
2973        int err = 0;
2974        bool modified = false;
2975
2976        ntfs_debug("Entering for %sinode 0x%lx.", NInoAttr(ni) ? "attr " : "",
2977                        vi->i_ino);
2978        /*
2979         * Dirty attribute inodes are written via their real inodes so just
2980         * clean them here.  Access time updates are taken care off when the
2981         * real inode is written.
2982         */
2983        if (NInoAttr(ni)) {
2984                NInoClearDirty(ni);
2985                ntfs_debug("Done.");
2986                return 0;
2987        }
2988        /* Map, pin, and lock the mft record belonging to the inode. */
2989        m = map_mft_record(ni);
2990        if (IS_ERR(m)) {
2991                err = PTR_ERR(m);
2992                goto err_out;
2993        }
2994        /* Update the access times in the standard information attribute. */
2995        ctx = ntfs_attr_get_search_ctx(ni, m);
2996        if (unlikely(!ctx)) {
2997                err = -ENOMEM;
2998                goto unm_err_out;
2999        }
3000        err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0,
3001                        CASE_SENSITIVE, 0, NULL, 0, ctx);
3002        if (unlikely(err)) {
3003                ntfs_attr_put_search_ctx(ctx);
3004                goto unm_err_out;
3005        }
3006        si = (STANDARD_INFORMATION*)((u8*)ctx->attr +
3007                        le16_to_cpu(ctx->attr->data.resident.value_offset));
3008        /* Update the access times if they have changed. */
3009        nt = utc2ntfs(vi->i_mtime);
3010        if (si->last_data_change_time != nt) {
3011                ntfs_debug("Updating mtime for inode 0x%lx: old = 0x%llx, "
3012                                "new = 0x%llx", vi->i_ino, (long long)
3013                                sle64_to_cpu(si->last_data_change_time),
3014                                (long long)sle64_to_cpu(nt));
3015                si->last_data_change_time = nt;
3016                modified = true;
3017        }
3018        nt = utc2ntfs(vi->i_ctime);
3019        if (si->last_mft_change_time != nt) {
3020                ntfs_debug("Updating ctime for inode 0x%lx: old = 0x%llx, "
3021                                "new = 0x%llx", vi->i_ino, (long long)
3022                                sle64_to_cpu(si->last_mft_change_time),
3023                                (long long)sle64_to_cpu(nt));
3024                si->last_mft_change_time = nt;
3025                modified = true;
3026        }
3027        nt = utc2ntfs(vi->i_atime);
3028        if (si->last_access_time != nt) {
3029                ntfs_debug("Updating atime for inode 0x%lx: old = 0x%llx, "
3030                                "new = 0x%llx", vi->i_ino,
3031                                (long long)sle64_to_cpu(si->last_access_time),
3032                                (long long)sle64_to_cpu(nt));
3033                si->last_access_time = nt;
3034                modified = true;
3035        }
3036        /*
3037         * If we just modified the standard information attribute we need to
3038         * mark the mft record it is in dirty.  We do this manually so that
3039         * mark_inode_dirty() is not called which would redirty the inode and
3040         * hence result in an infinite loop of trying to write the inode.
3041         * There is no need to mark the base inode nor the base mft record
3042         * dirty, since we are going to write this mft record below in any case
3043         * and the base mft record may actually not have been modified so it
3044         * might not need to be written out.
3045         * NOTE: It is not a problem when the inode for $MFT itself is being
3046         * written out as mark_ntfs_record_dirty() will only set I_DIRTY_PAGES
3047         * on the $MFT inode and hence ntfs_write_inode() will not be
3048         * re-invoked because of it which in turn is ok since the dirtied mft
3049         * record will be cleaned and written out to disk below, i.e. before
3050         * this function returns.
3051         */
3052        if (modified) {
3053                flush_dcache_mft_record_page(ctx->ntfs_ino);
3054                if (!NInoTestSetDirty(ctx->ntfs_ino))
3055                        mark_ntfs_record_dirty(ctx->ntfs_ino->page,
3056                                        ctx->ntfs_ino->page_ofs);
3057        }
3058        ntfs_attr_put_search_ctx(ctx);
3059        /* Now the access times are updated, write the base mft record. */
3060        if (NInoDirty(ni))
3061                err = write_mft_record(ni, m, sync);
3062        /* Write all attached extent mft records. */
3063        mutex_lock(&ni->extent_lock);
3064        if (ni->nr_extents > 0) {
3065                ntfs_inode **extent_nis = ni->ext.extent_ntfs_inos;
3066                int i;
3067
3068                ntfs_debug("Writing %i extent inodes.", ni->nr_extents);
3069                for (i = 0; i < ni->nr_extents; i++) {
3070                        ntfs_inode *tni = extent_nis[i];
3071
3072                        if (NInoDirty(tni)) {
3073                                MFT_RECORD *tm = map_mft_record(tni);
3074                                int ret;
3075
3076                                if (IS_ERR(tm)) {
3077                                        if (!err || err == -ENOMEM)
3078                                                err = PTR_ERR(tm);
3079                                        continue;
3080                                }
3081                                ret = write_mft_record(tni, tm, sync);
3082                                unmap_mft_record(tni);
3083                                if (unlikely(ret)) {
3084                                        if (!err || err == -ENOMEM)
3085                                                err = ret;
3086                                }
3087                        }
3088                }
3089        }
3090        mutex_unlock(&ni->extent_lock);
3091        unmap_mft_record(ni);
3092        if (unlikely(err))
3093                goto err_out;
3094        ntfs_debug("Done.");
3095        return 0;
3096unm_err_out:
3097        unmap_mft_record(ni);
3098err_out:
3099        if (err == -ENOMEM) {
3100                ntfs_warning(vi->i_sb, "Not enough memory to write inode.  "
3101                                "Marking the inode dirty again, so the VFS "
3102                                "retries later.");
3103                mark_inode_dirty(vi);
3104        } else {
3105                ntfs_error(vi->i_sb, "Failed (error %i):  Run chkdsk.", -err);
3106                NVolSetErrors(ni->vol);
3107        }
3108        return err;
3109}
3110
3111#endif /* NTFS_RW */
3112
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