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

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