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TOMOYO Linux Cross Reference
Linux/fs/ntfs/inode.c

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  1 /**
  2  * inode.c - NTFS kernel inode handling.
  3  *
  4  * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
  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_hash_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         vi->i_uid = vol->uid;
564         vi->i_gid = vol->gid;
565         vi->i_mode = 0;
566 
567         /*
568          * Initialize the ntfs specific part of @vi special casing
569          * FILE_MFT which we need to do at mount time.
570          */
571         if (vi->i_ino != FILE_MFT)
572                 ntfs_init_big_inode(vi);
573         ni = NTFS_I(vi);
574 
575         m = map_mft_record(ni);
576         if (IS_ERR(m)) {
577                 err = PTR_ERR(m);
578                 goto err_out;
579         }
580         ctx = ntfs_attr_get_search_ctx(ni, m);
581         if (!ctx) {
582                 err = -ENOMEM;
583                 goto unm_err_out;
584         }
585 
586         if (!(m->flags & MFT_RECORD_IN_USE)) {
587                 ntfs_error(vi->i_sb, "Inode is not in use!");
588                 goto unm_err_out;
589         }
590         if (m->base_mft_record) {
591                 ntfs_error(vi->i_sb, "Inode is an extent inode!");
592                 goto unm_err_out;
593         }
594 
595         /* Transfer information from mft record into vfs and ntfs inodes. */
596         vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
597 
598         /*
599          * FIXME: Keep in mind that link_count is two for files which have both
600          * a long file name and a short file name as separate entries, so if
601          * we are hiding short file names this will be too high. Either we need
602          * to account for the short file names by subtracting them or we need
603          * to make sure we delete files even though i_nlink is not zero which
604          * might be tricky due to vfs interactions. Need to think about this
605          * some more when implementing the unlink command.
606          */
607         set_nlink(vi, le16_to_cpu(m->link_count));
608         /*
609          * FIXME: Reparse points can have the directory bit set even though
610          * they would be S_IFLNK. Need to deal with this further below when we
611          * implement reparse points / symbolic links but it will do for now.
612          * Also if not a directory, it could be something else, rather than
613          * a regular file. But again, will do for now.
614          */
615         /* Everyone gets all permissions. */
616         vi->i_mode |= S_IRWXUGO;
617         /* If read-only, no one gets write permissions. */
618         if (IS_RDONLY(vi))
619                 vi->i_mode &= ~S_IWUGO;
620         if (m->flags & MFT_RECORD_IS_DIRECTORY) {
621                 vi->i_mode |= S_IFDIR;
622                 /*
623                  * Apply the directory permissions mask set in the mount
624                  * options.
625                  */
626                 vi->i_mode &= ~vol->dmask;
627                 /* Things break without this kludge! */
628                 if (vi->i_nlink > 1)
629                         set_nlink(vi, 1);
630         } else {
631                 vi->i_mode |= S_IFREG;
632                 /* Apply the file permissions mask set in the mount options. */
633                 vi->i_mode &= ~vol->fmask;
634         }
635         /*
636          * Find the standard information attribute in the mft record. At this
637          * stage we haven't setup the attribute list stuff yet, so this could
638          * in fact fail if the standard information is in an extent record, but
639          * I don't think this actually ever happens.
640          */
641         err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, 0, 0, NULL, 0,
642                         ctx);
643         if (unlikely(err)) {
644                 if (err == -ENOENT) {
645                         /*
646                          * TODO: We should be performing a hot fix here (if the
647                          * recover mount option is set) by creating a new
648                          * attribute.
649                          */
650                         ntfs_error(vi->i_sb, "$STANDARD_INFORMATION attribute "
651                                         "is missing.");
652                 }
653                 goto unm_err_out;
654         }
655         a = ctx->attr;
656         /* Get the standard information attribute value. */
657         si = (STANDARD_INFORMATION*)((u8*)a +
658                         le16_to_cpu(a->data.resident.value_offset));
659 
660         /* Transfer information from the standard information into vi. */
661         /*
662          * Note: The i_?times do not quite map perfectly onto the NTFS times,
663          * but they are close enough, and in the end it doesn't really matter
664          * that much...
665          */
666         /*
667          * mtime is the last change of the data within the file. Not changed
668          * when only metadata is changed, e.g. a rename doesn't affect mtime.
669          */
670         vi->i_mtime = ntfs2utc(si->last_data_change_time);
671         /*
672          * ctime is the last change of the metadata of the file. This obviously
673          * always changes, when mtime is changed. ctime can be changed on its
674          * own, mtime is then not changed, e.g. when a file is renamed.
675          */
676         vi->i_ctime = ntfs2utc(si->last_mft_change_time);
677         /*
678          * Last access to the data within the file. Not changed during a rename
679          * for example but changed whenever the file is written to.
680          */
681         vi->i_atime = ntfs2utc(si->last_access_time);
682 
683         /* Find the attribute list attribute if present. */
684         ntfs_attr_reinit_search_ctx(ctx);
685         err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
686         if (err) {
687                 if (unlikely(err != -ENOENT)) {
688                         ntfs_error(vi->i_sb, "Failed to lookup attribute list "
689                                         "attribute.");
690                         goto unm_err_out;
691                 }
692         } else /* if (!err) */ {
693                 if (vi->i_ino == FILE_MFT)
694                         goto skip_attr_list_load;
695                 ntfs_debug("Attribute list found in inode 0x%lx.", vi->i_ino);
696                 NInoSetAttrList(ni);
697                 a = ctx->attr;
698                 if (a->flags & ATTR_COMPRESSION_MASK) {
699                         ntfs_error(vi->i_sb, "Attribute list attribute is "
700                                         "compressed.");
701                         goto unm_err_out;
702                 }
703                 if (a->flags & ATTR_IS_ENCRYPTED ||
704                                 a->flags & ATTR_IS_SPARSE) {
705                         if (a->non_resident) {
706                                 ntfs_error(vi->i_sb, "Non-resident attribute "
707                                                 "list attribute is encrypted/"
708                                                 "sparse.");
709                                 goto unm_err_out;
710                         }
711                         ntfs_warning(vi->i_sb, "Resident attribute list "
712                                         "attribute in inode 0x%lx is marked "
713                                         "encrypted/sparse which is not true.  "
714                                         "However, Windows allows this and "
715                                         "chkdsk does not detect or correct it "
716                                         "so we will just ignore the invalid "
717                                         "flags and pretend they are not set.",
718                                         vi->i_ino);
719                 }
720                 /* Now allocate memory for the attribute list. */
721                 ni->attr_list_size = (u32)ntfs_attr_size(a);
722                 ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
723                 if (!ni->attr_list) {
724                         ntfs_error(vi->i_sb, "Not enough memory to allocate "
725                                         "buffer for attribute list.");
726                         err = -ENOMEM;
727                         goto unm_err_out;
728                 }
729                 if (a->non_resident) {
730                         NInoSetAttrListNonResident(ni);
731                         if (a->data.non_resident.lowest_vcn) {
732                                 ntfs_error(vi->i_sb, "Attribute list has non "
733                                                 "zero lowest_vcn.");
734                                 goto unm_err_out;
735                         }
736                         /*
737                          * Setup the runlist. No need for locking as we have
738                          * exclusive access to the inode at this time.
739                          */
740                         ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
741                                         a, NULL);
742                         if (IS_ERR(ni->attr_list_rl.rl)) {
743                                 err = PTR_ERR(ni->attr_list_rl.rl);
744                                 ni->attr_list_rl.rl = NULL;
745                                 ntfs_error(vi->i_sb, "Mapping pairs "
746                                                 "decompression failed.");
747                                 goto unm_err_out;
748                         }
749                         /* Now load the attribute list. */
750                         if ((err = load_attribute_list(vol, &ni->attr_list_rl,
751                                         ni->attr_list, ni->attr_list_size,
752                                         sle64_to_cpu(a->data.non_resident.
753                                         initialized_size)))) {
754                                 ntfs_error(vi->i_sb, "Failed to load "
755                                                 "attribute list attribute.");
756                                 goto unm_err_out;
757                         }
758                 } else /* if (!a->non_resident) */ {
759                         if ((u8*)a + le16_to_cpu(a->data.resident.value_offset)
760                                         + le32_to_cpu(
761                                         a->data.resident.value_length) >
762                                         (u8*)ctx->mrec + vol->mft_record_size) {
763                                 ntfs_error(vi->i_sb, "Corrupt attribute list "
764                                                 "in inode.");
765                                 goto unm_err_out;
766                         }
767                         /* Now copy the attribute list. */
768                         memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
769                                         a->data.resident.value_offset),
770                                         le32_to_cpu(
771                                         a->data.resident.value_length));
772                 }
773         }
774 skip_attr_list_load:
775         /*
776          * If an attribute list is present we now have the attribute list value
777          * in ntfs_ino->attr_list and it is ntfs_ino->attr_list_size bytes.
778          */
779         if (S_ISDIR(vi->i_mode)) {
780                 loff_t bvi_size;
781                 ntfs_inode *bni;
782                 INDEX_ROOT *ir;
783                 u8 *ir_end, *index_end;
784 
785                 /* It is a directory, find index root attribute. */
786                 ntfs_attr_reinit_search_ctx(ctx);
787                 err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE,
788                                 0, NULL, 0, ctx);
789                 if (unlikely(err)) {
790                         if (err == -ENOENT) {
791                                 // FIXME: File is corrupt! Hot-fix with empty
792                                 // index root attribute if recovery option is
793                                 // set.
794                                 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute "
795                                                 "is missing.");
796                         }
797                         goto unm_err_out;
798                 }
799                 a = ctx->attr;
800                 /* Set up the state. */
801                 if (unlikely(a->non_resident)) {
802                         ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
803                                         "resident.");
804                         goto unm_err_out;
805                 }
806                 /* Ensure the attribute name is placed before the value. */
807                 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
808                                 le16_to_cpu(a->data.resident.value_offset)))) {
809                         ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
810                                         "placed after the attribute value.");
811                         goto unm_err_out;
812                 }
813                 /*
814                  * Compressed/encrypted index root just means that the newly
815                  * created files in that directory should be created compressed/
816                  * encrypted. However index root cannot be both compressed and
817                  * encrypted.
818                  */
819                 if (a->flags & ATTR_COMPRESSION_MASK)
820                         NInoSetCompressed(ni);
821                 if (a->flags & ATTR_IS_ENCRYPTED) {
822                         if (a->flags & ATTR_COMPRESSION_MASK) {
823                                 ntfs_error(vi->i_sb, "Found encrypted and "
824                                                 "compressed attribute.");
825                                 goto unm_err_out;
826                         }
827                         NInoSetEncrypted(ni);
828                 }
829                 if (a->flags & ATTR_IS_SPARSE)
830                         NInoSetSparse(ni);
831                 ir = (INDEX_ROOT*)((u8*)a +
832                                 le16_to_cpu(a->data.resident.value_offset));
833                 ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
834                 if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
835                         ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
836                                         "corrupt.");
837                         goto unm_err_out;
838                 }
839                 index_end = (u8*)&ir->index +
840                                 le32_to_cpu(ir->index.index_length);
841                 if (index_end > ir_end) {
842                         ntfs_error(vi->i_sb, "Directory index is corrupt.");
843                         goto unm_err_out;
844                 }
845                 if (ir->type != AT_FILE_NAME) {
846                         ntfs_error(vi->i_sb, "Indexed attribute is not "
847                                         "$FILE_NAME.");
848                         goto unm_err_out;
849                 }
850                 if (ir->collation_rule != COLLATION_FILE_NAME) {
851                         ntfs_error(vi->i_sb, "Index collation rule is not "
852                                         "COLLATION_FILE_NAME.");
853                         goto unm_err_out;
854                 }
855                 ni->itype.index.collation_rule = ir->collation_rule;
856                 ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
857                 if (ni->itype.index.block_size &
858                                 (ni->itype.index.block_size - 1)) {
859                         ntfs_error(vi->i_sb, "Index block size (%u) is not a "
860                                         "power of two.",
861                                         ni->itype.index.block_size);
862                         goto unm_err_out;
863                 }
864                 if (ni->itype.index.block_size > PAGE_SIZE) {
865                         ntfs_error(vi->i_sb, "Index block size (%u) > "
866                                         "PAGE_SIZE (%ld) is not "
867                                         "supported.  Sorry.",
868                                         ni->itype.index.block_size,
869                                         PAGE_SIZE);
870                         err = -EOPNOTSUPP;
871                         goto unm_err_out;
872                 }
873                 if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
874                         ntfs_error(vi->i_sb, "Index block size (%u) < "
875                                         "NTFS_BLOCK_SIZE (%i) is not "
876                                         "supported.  Sorry.",
877                                         ni->itype.index.block_size,
878                                         NTFS_BLOCK_SIZE);
879                         err = -EOPNOTSUPP;
880                         goto unm_err_out;
881                 }
882                 ni->itype.index.block_size_bits =
883                                 ffs(ni->itype.index.block_size) - 1;
884                 /* Determine the size of a vcn in the directory index. */
885                 if (vol->cluster_size <= ni->itype.index.block_size) {
886                         ni->itype.index.vcn_size = vol->cluster_size;
887                         ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
888                 } else {
889                         ni->itype.index.vcn_size = vol->sector_size;
890                         ni->itype.index.vcn_size_bits = vol->sector_size_bits;
891                 }
892 
893                 /* Setup the index allocation attribute, even if not present. */
894                 NInoSetMstProtected(ni);
895                 ni->type = AT_INDEX_ALLOCATION;
896                 ni->name = I30;
897                 ni->name_len = 4;
898 
899                 if (!(ir->index.flags & LARGE_INDEX)) {
900                         /* No index allocation. */
901                         vi->i_size = ni->initialized_size =
902                                         ni->allocated_size = 0;
903                         /* We are done with the mft record, so we release it. */
904                         ntfs_attr_put_search_ctx(ctx);
905                         unmap_mft_record(ni);
906                         m = NULL;
907                         ctx = NULL;
908                         goto skip_large_dir_stuff;
909                 } /* LARGE_INDEX: Index allocation present. Setup state. */
910                 NInoSetIndexAllocPresent(ni);
911                 /* Find index allocation attribute. */
912                 ntfs_attr_reinit_search_ctx(ctx);
913                 err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4,
914                                 CASE_SENSITIVE, 0, NULL, 0, ctx);
915                 if (unlikely(err)) {
916                         if (err == -ENOENT)
917                                 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION "
918                                                 "attribute is not present but "
919                                                 "$INDEX_ROOT indicated it is.");
920                         else
921                                 ntfs_error(vi->i_sb, "Failed to lookup "
922                                                 "$INDEX_ALLOCATION "
923                                                 "attribute.");
924                         goto unm_err_out;
925                 }
926                 a = ctx->attr;
927                 if (!a->non_resident) {
928                         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
929                                         "is resident.");
930                         goto unm_err_out;
931                 }
932                 /*
933                  * Ensure the attribute name is placed before the mapping pairs
934                  * array.
935                  */
936                 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
937                                 le16_to_cpu(
938                                 a->data.non_resident.mapping_pairs_offset)))) {
939                         ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
940                                         "is placed after the mapping pairs "
941                                         "array.");
942                         goto unm_err_out;
943                 }
944                 if (a->flags & ATTR_IS_ENCRYPTED) {
945                         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
946                                         "is encrypted.");
947                         goto unm_err_out;
948                 }
949                 if (a->flags & ATTR_IS_SPARSE) {
950                         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
951                                         "is sparse.");
952                         goto unm_err_out;
953                 }
954                 if (a->flags & ATTR_COMPRESSION_MASK) {
955                         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
956                                         "is compressed.");
957                         goto unm_err_out;
958                 }
959                 if (a->data.non_resident.lowest_vcn) {
960                         ntfs_error(vi->i_sb, "First extent of "
961                                         "$INDEX_ALLOCATION attribute has non "
962                                         "zero lowest_vcn.");
963                         goto unm_err_out;
964                 }
965                 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
966                 ni->initialized_size = sle64_to_cpu(
967                                 a->data.non_resident.initialized_size);
968                 ni->allocated_size = sle64_to_cpu(
969                                 a->data.non_resident.allocated_size);
970                 /*
971                  * We are done with the mft record, so we release it. Otherwise
972                  * we would deadlock in ntfs_attr_iget().
973                  */
974                 ntfs_attr_put_search_ctx(ctx);
975                 unmap_mft_record(ni);
976                 m = NULL;
977                 ctx = NULL;
978                 /* Get the index bitmap attribute inode. */
979                 bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4);
980                 if (IS_ERR(bvi)) {
981                         ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
982                         err = PTR_ERR(bvi);
983                         goto unm_err_out;
984                 }
985                 bni = NTFS_I(bvi);
986                 if (NInoCompressed(bni) || NInoEncrypted(bni) ||
987                                 NInoSparse(bni)) {
988                         ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
989                                         "and/or encrypted and/or sparse.");
990                         goto iput_unm_err_out;
991                 }
992                 /* Consistency check bitmap size vs. index allocation size. */
993                 bvi_size = i_size_read(bvi);
994                 if ((bvi_size << 3) < (vi->i_size >>
995                                 ni->itype.index.block_size_bits)) {
996                         ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
997                                         "for index allocation (0x%llx).",
998                                         bvi_size << 3, vi->i_size);
999                         goto iput_unm_err_out;
1000                 }
1001                 /* No longer need the bitmap attribute inode. */
1002                 iput(bvi);
1003 skip_large_dir_stuff:
1004                 /* Setup the operations for this inode. */
1005                 vi->i_op = &ntfs_dir_inode_ops;
1006                 vi->i_fop = &ntfs_dir_ops;
1007                 vi->i_mapping->a_ops = &ntfs_mst_aops;
1008         } else {
1009                 /* It is a file. */
1010                 ntfs_attr_reinit_search_ctx(ctx);
1011 
1012                 /* Setup the data attribute, even if not present. */
1013                 ni->type = AT_DATA;
1014                 ni->name = NULL;
1015                 ni->name_len = 0;
1016 
1017                 /* Find first extent of the unnamed data attribute. */
1018                 err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx);
1019                 if (unlikely(err)) {
1020                         vi->i_size = ni->initialized_size =
1021                                         ni->allocated_size = 0;
1022                         if (err != -ENOENT) {
1023                                 ntfs_error(vi->i_sb, "Failed to lookup $DATA "
1024                                                 "attribute.");
1025                                 goto unm_err_out;
1026                         }
1027                         /*
1028                          * FILE_Secure does not have an unnamed $DATA
1029                          * attribute, so we special case it here.
1030                          */
1031                         if (vi->i_ino == FILE_Secure)
1032                                 goto no_data_attr_special_case;
1033                         /*
1034                          * Most if not all the system files in the $Extend
1035                          * system directory do not have unnamed data
1036                          * attributes so we need to check if the parent
1037                          * directory of the file is FILE_Extend and if it is
1038                          * ignore this error. To do this we need to get the
1039                          * name of this inode from the mft record as the name
1040                          * contains the back reference to the parent directory.
1041                          */
1042                         if (ntfs_is_extended_system_file(ctx) > 0)
1043                                 goto no_data_attr_special_case;
1044                         // FIXME: File is corrupt! Hot-fix with empty data
1045                         // attribute if recovery option is set.
1046                         ntfs_error(vi->i_sb, "$DATA attribute is missing.");
1047                         goto unm_err_out;
1048                 }
1049                 a = ctx->attr;
1050                 /* Setup the state. */
1051                 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1052                         if (a->flags & ATTR_COMPRESSION_MASK) {
1053                                 NInoSetCompressed(ni);
1054                                 if (vol->cluster_size > 4096) {
1055                                         ntfs_error(vi->i_sb, "Found "
1056                                                         "compressed data but "
1057                                                         "compression is "
1058                                                         "disabled due to "
1059                                                         "cluster size (%i) > "
1060                                                         "4kiB.",
1061                                                         vol->cluster_size);
1062                                         goto unm_err_out;
1063                                 }
1064                                 if ((a->flags & ATTR_COMPRESSION_MASK)
1065                                                 != ATTR_IS_COMPRESSED) {
1066                                         ntfs_error(vi->i_sb, "Found unknown "
1067                                                         "compression method "
1068                                                         "or corrupt file.");
1069                                         goto unm_err_out;
1070                                 }
1071                         }
1072                         if (a->flags & ATTR_IS_SPARSE)
1073                                 NInoSetSparse(ni);
1074                 }
1075                 if (a->flags & ATTR_IS_ENCRYPTED) {
1076                         if (NInoCompressed(ni)) {
1077                                 ntfs_error(vi->i_sb, "Found encrypted and "
1078                                                 "compressed data.");
1079                                 goto unm_err_out;
1080                         }
1081                         NInoSetEncrypted(ni);
1082                 }
1083                 if (a->non_resident) {
1084                         NInoSetNonResident(ni);
1085                         if (NInoCompressed(ni) || NInoSparse(ni)) {
1086                                 if (NInoCompressed(ni) && a->data.non_resident.
1087                                                 compression_unit != 4) {
1088                                         ntfs_error(vi->i_sb, "Found "
1089                                                         "non-standard "
1090                                                         "compression unit (%u "
1091                                                         "instead of 4).  "
1092                                                         "Cannot handle this.",
1093                                                         a->data.non_resident.
1094                                                         compression_unit);
1095                                         err = -EOPNOTSUPP;
1096                                         goto unm_err_out;
1097                                 }
1098                                 if (a->data.non_resident.compression_unit) {
1099                                         ni->itype.compressed.block_size = 1U <<
1100                                                         (a->data.non_resident.
1101                                                         compression_unit +
1102                                                         vol->cluster_size_bits);
1103                                         ni->itype.compressed.block_size_bits =
1104                                                         ffs(ni->itype.
1105                                                         compressed.
1106                                                         block_size) - 1;
1107                                         ni->itype.compressed.block_clusters =
1108                                                         1U << a->data.
1109                                                         non_resident.
1110                                                         compression_unit;
1111                                 } else {
1112                                         ni->itype.compressed.block_size = 0;
1113                                         ni->itype.compressed.block_size_bits =
1114                                                         0;
1115                                         ni->itype.compressed.block_clusters =
1116                                                         0;
1117                                 }
1118                                 ni->itype.compressed.size = sle64_to_cpu(
1119                                                 a->data.non_resident.
1120                                                 compressed_size);
1121                         }
1122                         if (a->data.non_resident.lowest_vcn) {
1123                                 ntfs_error(vi->i_sb, "First extent of $DATA "
1124                                                 "attribute has non zero "
1125                                                 "lowest_vcn.");
1126                                 goto unm_err_out;
1127                         }
1128                         vi->i_size = sle64_to_cpu(
1129                                         a->data.non_resident.data_size);
1130                         ni->initialized_size = sle64_to_cpu(
1131                                         a->data.non_resident.initialized_size);
1132                         ni->allocated_size = sle64_to_cpu(
1133                                         a->data.non_resident.allocated_size);
1134                 } else { /* Resident attribute. */
1135                         vi->i_size = ni->initialized_size = le32_to_cpu(
1136                                         a->data.resident.value_length);
1137                         ni->allocated_size = le32_to_cpu(a->length) -
1138                                         le16_to_cpu(
1139                                         a->data.resident.value_offset);
1140                         if (vi->i_size > ni->allocated_size) {
1141                                 ntfs_error(vi->i_sb, "Resident data attribute "
1142                                                 "is corrupt (size exceeds "
1143                                                 "allocation).");
1144                                 goto unm_err_out;
1145                         }
1146                 }
1147 no_data_attr_special_case:
1148                 /* We are done with the mft record, so we release it. */
1149                 ntfs_attr_put_search_ctx(ctx);
1150                 unmap_mft_record(ni);
1151                 m = NULL;
1152                 ctx = NULL;
1153                 /* Setup the operations for this inode. */
1154                 vi->i_op = &ntfs_file_inode_ops;
1155                 vi->i_fop = &ntfs_file_ops;
1156                 vi->i_mapping->a_ops = &ntfs_normal_aops;
1157                 if (NInoMstProtected(ni))
1158                         vi->i_mapping->a_ops = &ntfs_mst_aops;
1159                 else if (NInoCompressed(ni))
1160                         vi->i_mapping->a_ops = &ntfs_compressed_aops;
1161         }
1162         /*
1163          * The number of 512-byte blocks used on disk (for stat). This is in so
1164          * far inaccurate as it doesn't account for any named streams or other
1165          * special non-resident attributes, but that is how Windows works, too,
1166          * so we are at least consistent with Windows, if not entirely
1167          * consistent with the Linux Way. Doing it the Linux Way would cause a
1168          * significant slowdown as it would involve iterating over all
1169          * attributes in the mft record and adding the allocated/compressed
1170          * sizes of all non-resident attributes present to give us the Linux
1171          * correct size that should go into i_blocks (after division by 512).
1172          */
1173         if (S_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni)))
1174                 vi->i_blocks = ni->itype.compressed.size >> 9;
1175         else
1176                 vi->i_blocks = ni->allocated_size >> 9;
1177         ntfs_debug("Done.");
1178         return 0;
1179 iput_unm_err_out:
1180         iput(bvi);
1181 unm_err_out:
1182         if (!err)
1183                 err = -EIO;
1184         if (ctx)
1185                 ntfs_attr_put_search_ctx(ctx);
1186         if (m)
1187                 unmap_mft_record(ni);
1188 err_out:
1189         ntfs_error(vol->sb, "Failed with error code %i.  Marking corrupt "
1190                         "inode 0x%lx as bad.  Run chkdsk.", err, vi->i_ino);
1191         make_bad_inode(vi);
1192         if (err != -EOPNOTSUPP && err != -ENOMEM)
1193                 NVolSetErrors(vol);
1194         return err;
1195 }
1196 
1197 /**
1198  * ntfs_read_locked_attr_inode - read an attribute inode from its base inode
1199  * @base_vi:    base inode
1200  * @vi:         attribute inode to read
1201  *
1202  * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the
1203  * attribute inode described by @vi into memory from the base mft record
1204  * described by @base_ni.
1205  *
1206  * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for
1207  * reading and looks up the attribute described by @vi before setting up the
1208  * necessary fields in @vi as well as initializing the ntfs inode.
1209  *
1210  * Q: What locks are held when the function is called?
1211  * A: i_state has I_NEW set, hence the inode is locked, also
1212  *    i_count is set to 1, so it is not going to go away
1213  *
1214  * Return 0 on success and -errno on error.  In the error case, the inode will
1215  * have had make_bad_inode() executed on it.
1216  *
1217  * Note this cannot be called for AT_INDEX_ALLOCATION.
1218  */
1219 static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
1220 {
1221         ntfs_volume *vol = NTFS_SB(vi->i_sb);
1222         ntfs_inode *ni, *base_ni;
1223         MFT_RECORD *m;
1224         ATTR_RECORD *a;
1225         ntfs_attr_search_ctx *ctx;
1226         int err = 0;
1227 
1228         ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1229 
1230         ntfs_init_big_inode(vi);
1231 
1232         ni      = NTFS_I(vi);
1233         base_ni = NTFS_I(base_vi);
1234 
1235         /* Just mirror the values from the base inode. */
1236         vi->i_uid       = base_vi->i_uid;
1237         vi->i_gid       = base_vi->i_gid;
1238         set_nlink(vi, base_vi->i_nlink);
1239         vi->i_mtime     = base_vi->i_mtime;
1240         vi->i_ctime     = base_vi->i_ctime;
1241         vi->i_atime     = base_vi->i_atime;
1242         vi->i_generation = ni->seq_no = base_ni->seq_no;
1243 
1244         /* Set inode type to zero but preserve permissions. */
1245         vi->i_mode      = base_vi->i_mode & ~S_IFMT;
1246 
1247         m = map_mft_record(base_ni);
1248         if (IS_ERR(m)) {
1249                 err = PTR_ERR(m);
1250                 goto err_out;
1251         }
1252         ctx = ntfs_attr_get_search_ctx(base_ni, m);
1253         if (!ctx) {
1254                 err = -ENOMEM;
1255                 goto unm_err_out;
1256         }
1257         /* Find the attribute. */
1258         err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1259                         CASE_SENSITIVE, 0, NULL, 0, ctx);
1260         if (unlikely(err))
1261                 goto unm_err_out;
1262         a = ctx->attr;
1263         if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1264                 if (a->flags & ATTR_COMPRESSION_MASK) {
1265                         NInoSetCompressed(ni);
1266                         if ((ni->type != AT_DATA) || (ni->type == AT_DATA &&
1267                                         ni->name_len)) {
1268                                 ntfs_error(vi->i_sb, "Found compressed "
1269                                                 "non-data or named data "
1270                                                 "attribute.  Please report "
1271                                                 "you saw this message to "
1272                                                 "linux-ntfs-dev@lists."
1273                                                 "sourceforge.net");
1274                                 goto unm_err_out;
1275                         }
1276                         if (vol->cluster_size > 4096) {
1277                                 ntfs_error(vi->i_sb, "Found compressed "
1278                                                 "attribute but compression is "
1279                                                 "disabled due to cluster size "
1280                                                 "(%i) > 4kiB.",
1281                                                 vol->cluster_size);
1282                                 goto unm_err_out;
1283                         }
1284                         if ((a->flags & ATTR_COMPRESSION_MASK) !=
1285                                         ATTR_IS_COMPRESSED) {
1286                                 ntfs_error(vi->i_sb, "Found unknown "
1287                                                 "compression method.");
1288                                 goto unm_err_out;
1289                         }
1290                 }
1291                 /*
1292                  * The compressed/sparse flag set in an index root just means
1293                  * to compress all files.
1294                  */
1295                 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1296                         ntfs_error(vi->i_sb, "Found mst protected attribute "
1297                                         "but the attribute is %s.  Please "
1298                                         "report you saw this message to "
1299                                         "linux-ntfs-dev@lists.sourceforge.net",
1300                                         NInoCompressed(ni) ? "compressed" :
1301                                         "sparse");
1302                         goto unm_err_out;
1303                 }
1304                 if (a->flags & ATTR_IS_SPARSE)
1305                         NInoSetSparse(ni);
1306         }
1307         if (a->flags & ATTR_IS_ENCRYPTED) {
1308                 if (NInoCompressed(ni)) {
1309                         ntfs_error(vi->i_sb, "Found encrypted and compressed "
1310                                         "data.");
1311                         goto unm_err_out;
1312                 }
1313                 /*
1314                  * The encryption flag set in an index root just means to
1315                  * encrypt all files.
1316                  */
1317                 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1318                         ntfs_error(vi->i_sb, "Found mst protected attribute "
1319                                         "but the attribute is encrypted.  "
1320                                         "Please report you saw this message "
1321                                         "to linux-ntfs-dev@lists.sourceforge."
1322                                         "net");
1323                         goto unm_err_out;
1324                 }
1325                 if (ni->type != AT_DATA) {
1326                         ntfs_error(vi->i_sb, "Found encrypted non-data "
1327                                         "attribute.");
1328                         goto unm_err_out;
1329                 }
1330                 NInoSetEncrypted(ni);
1331         }
1332         if (!a->non_resident) {
1333                 /* Ensure the attribute name is placed before the value. */
1334                 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1335                                 le16_to_cpu(a->data.resident.value_offset)))) {
1336                         ntfs_error(vol->sb, "Attribute name is placed after "
1337                                         "the attribute value.");
1338                         goto unm_err_out;
1339                 }
1340                 if (NInoMstProtected(ni)) {
1341                         ntfs_error(vi->i_sb, "Found mst protected attribute "
1342                                         "but the attribute is resident.  "
1343                                         "Please report you saw this message to "
1344                                         "linux-ntfs-dev@lists.sourceforge.net");
1345                         goto unm_err_out;
1346                 }
1347                 vi->i_size = ni->initialized_size = le32_to_cpu(
1348                                 a->data.resident.value_length);
1349                 ni->allocated_size = le32_to_cpu(a->length) -
1350                                 le16_to_cpu(a->data.resident.value_offset);
1351                 if (vi->i_size > ni->allocated_size) {
1352                         ntfs_error(vi->i_sb, "Resident attribute is corrupt "
1353                                         "(size exceeds allocation).");
1354                         goto unm_err_out;
1355                 }
1356         } else {
1357                 NInoSetNonResident(ni);
1358                 /*
1359                  * Ensure the attribute name is placed before the mapping pairs
1360                  * array.
1361                  */
1362                 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1363                                 le16_to_cpu(
1364                                 a->data.non_resident.mapping_pairs_offset)))) {
1365                         ntfs_error(vol->sb, "Attribute name is placed after "
1366                                         "the mapping pairs array.");
1367                         goto unm_err_out;
1368                 }
1369                 if (NInoCompressed(ni) || NInoSparse(ni)) {
1370                         if (NInoCompressed(ni) && a->data.non_resident.
1371                                         compression_unit != 4) {
1372                                 ntfs_error(vi->i_sb, "Found non-standard "
1373                                                 "compression unit (%u instead "
1374                                                 "of 4).  Cannot handle this.",
1375                                                 a->data.non_resident.
1376                                                 compression_unit);
1377                                 err = -EOPNOTSUPP;
1378                                 goto unm_err_out;
1379                         }
1380                         if (a->data.non_resident.compression_unit) {
1381                                 ni->itype.compressed.block_size = 1U <<
1382                                                 (a->data.non_resident.
1383                                                 compression_unit +
1384                                                 vol->cluster_size_bits);
1385                                 ni->itype.compressed.block_size_bits =
1386                                                 ffs(ni->itype.compressed.
1387                                                 block_size) - 1;
1388                                 ni->itype.compressed.block_clusters = 1U <<
1389                                                 a->data.non_resident.
1390                                                 compression_unit;
1391                         } else {
1392                                 ni->itype.compressed.block_size = 0;
1393                                 ni->itype.compressed.block_size_bits = 0;
1394                                 ni->itype.compressed.block_clusters = 0;
1395                         }
1396                         ni->itype.compressed.size = sle64_to_cpu(
1397                                         a->data.non_resident.compressed_size);
1398                 }
1399                 if (a->data.non_resident.lowest_vcn) {
1400                         ntfs_error(vi->i_sb, "First extent of attribute has "
1401                                         "non-zero lowest_vcn.");
1402                         goto unm_err_out;
1403                 }
1404                 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
1405                 ni->initialized_size = sle64_to_cpu(
1406                                 a->data.non_resident.initialized_size);
1407                 ni->allocated_size = sle64_to_cpu(
1408                                 a->data.non_resident.allocated_size);
1409         }
1410         vi->i_mapping->a_ops = &ntfs_normal_aops;
1411         if (NInoMstProtected(ni))
1412                 vi->i_mapping->a_ops = &ntfs_mst_aops;
1413         else if (NInoCompressed(ni))
1414                 vi->i_mapping->a_ops = &ntfs_compressed_aops;
1415         if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
1416                 vi->i_blocks = ni->itype.compressed.size >> 9;
1417         else
1418                 vi->i_blocks = ni->allocated_size >> 9;
1419         /*
1420          * Make sure the base inode does not go away and attach it to the
1421          * attribute inode.
1422          */
1423         igrab(base_vi);
1424         ni->ext.base_ntfs_ino = base_ni;
1425         ni->nr_extents = -1;
1426 
1427         ntfs_attr_put_search_ctx(ctx);
1428         unmap_mft_record(base_ni);
1429 
1430         ntfs_debug("Done.");
1431         return 0;
1432 
1433 unm_err_out:
1434         if (!err)
1435                 err = -EIO;
1436         if (ctx)
1437                 ntfs_attr_put_search_ctx(ctx);
1438         unmap_mft_record(base_ni);
1439 err_out:
1440         ntfs_error(vol->sb, "Failed with error code %i while reading attribute "
1441                         "inode (mft_no 0x%lx, type 0x%x, name_len %i).  "
1442                         "Marking corrupt inode and base inode 0x%lx as bad.  "
1443                         "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len,
1444                         base_vi->i_ino);
1445         make_bad_inode(vi);
1446         if (err != -ENOMEM)
1447                 NVolSetErrors(vol);
1448         return err;
1449 }
1450 
1451 /**
1452  * ntfs_read_locked_index_inode - read an index inode from its base inode
1453  * @base_vi:    base inode
1454  * @vi:         index inode to read
1455  *
1456  * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the
1457  * index inode described by @vi into memory from the base mft record described
1458  * by @base_ni.
1459  *
1460  * ntfs_read_locked_index_inode() maps, pins and locks the base inode for
1461  * reading and looks up the attributes relating to the index described by @vi
1462  * before setting up the necessary fields in @vi as well as initializing the
1463  * ntfs inode.
1464  *
1465  * Note, index inodes are essentially attribute inodes (NInoAttr() is true)
1466  * with the attribute type set to AT_INDEX_ALLOCATION.  Apart from that, they
1467  * are setup like directory inodes since directories are a special case of
1468  * indices ao they need to be treated in much the same way.  Most importantly,
1469  * for small indices the index allocation attribute might not actually exist.
1470  * However, the index root attribute always exists but this does not need to
1471  * have an inode associated with it and this is why we define a new inode type
1472  * index.  Also, like for directories, we need to have an attribute inode for
1473  * the bitmap attribute corresponding to the index allocation attribute and we
1474  * can store this in the appropriate field of the inode, just like we do for
1475  * normal directory inodes.
1476  *
1477  * Q: What locks are held when the function is called?
1478  * A: i_state has I_NEW set, hence the inode is locked, also
1479  *    i_count is set to 1, so it is not going to go away
1480  *
1481  * Return 0 on success and -errno on error.  In the error case, the inode will
1482  * have had make_bad_inode() executed on it.
1483  */
1484 static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
1485 {
1486         loff_t bvi_size;
1487         ntfs_volume *vol = NTFS_SB(vi->i_sb);
1488         ntfs_inode *ni, *base_ni, *bni;
1489         struct inode *bvi;
1490         MFT_RECORD *m;
1491         ATTR_RECORD *a;
1492         ntfs_attr_search_ctx *ctx;
1493         INDEX_ROOT *ir;
1494         u8 *ir_end, *index_end;
1495         int err = 0;
1496 
1497         ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1498         ntfs_init_big_inode(vi);
1499         ni      = NTFS_I(vi);
1500         base_ni = NTFS_I(base_vi);
1501         /* Just mirror the values from the base inode. */
1502         vi->i_uid       = base_vi->i_uid;
1503         vi->i_gid       = base_vi->i_gid;
1504         set_nlink(vi, base_vi->i_nlink);
1505         vi->i_mtime     = base_vi->i_mtime;
1506         vi->i_ctime     = base_vi->i_ctime;
1507         vi->i_atime     = base_vi->i_atime;
1508         vi->i_generation = ni->seq_no = base_ni->seq_no;
1509         /* Set inode type to zero but preserve permissions. */
1510         vi->i_mode      = base_vi->i_mode & ~S_IFMT;
1511         /* Map the mft record for the base inode. */
1512         m = map_mft_record(base_ni);
1513         if (IS_ERR(m)) {
1514                 err = PTR_ERR(m);
1515                 goto err_out;
1516         }
1517         ctx = ntfs_attr_get_search_ctx(base_ni, m);
1518         if (!ctx) {
1519                 err = -ENOMEM;
1520                 goto unm_err_out;
1521         }
1522         /* Find the index root attribute. */
1523         err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len,
1524                         CASE_SENSITIVE, 0, NULL, 0, ctx);
1525         if (unlikely(err)) {
1526                 if (err == -ENOENT)
1527                         ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
1528                                         "missing.");
1529                 goto unm_err_out;
1530         }
1531         a = ctx->attr;
1532         /* Set up the state. */
1533         if (unlikely(a->non_resident)) {
1534                 ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
1535                 goto unm_err_out;
1536         }
1537         /* Ensure the attribute name is placed before the value. */
1538         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1539                         le16_to_cpu(a->data.resident.value_offset)))) {
1540                 ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
1541                                 "after the attribute value.");
1542                 goto unm_err_out;
1543         }
1544         /*
1545          * Compressed/encrypted/sparse index root is not allowed, except for
1546          * directories of course but those are not dealt with here.
1547          */
1548         if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
1549                         ATTR_IS_SPARSE)) {
1550                 ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
1551                                 "root attribute.");
1552                 goto unm_err_out;
1553         }
1554         ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));
1555         ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
1556         if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
1557                 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt.");
1558                 goto unm_err_out;
1559         }
1560         index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
1561         if (index_end > ir_end) {
1562                 ntfs_error(vi->i_sb, "Index is corrupt.");
1563                 goto unm_err_out;
1564         }
1565         if (ir->type) {
1566                 ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).",
1567                                 le32_to_cpu(ir->type));
1568                 goto unm_err_out;
1569         }
1570         ni->itype.index.collation_rule = ir->collation_rule;
1571         ntfs_debug("Index collation rule is 0x%x.",
1572                         le32_to_cpu(ir->collation_rule));
1573         ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
1574         if (!is_power_of_2(ni->itype.index.block_size)) {
1575                 ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
1576                                 "two.", ni->itype.index.block_size);
1577                 goto unm_err_out;
1578         }
1579         if (ni->itype.index.block_size > PAGE_SIZE) {
1580                 ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_SIZE "
1581                                 "(%ld) is not supported.  Sorry.",
1582                                 ni->itype.index.block_size, PAGE_SIZE);
1583                 err = -EOPNOTSUPP;
1584                 goto unm_err_out;
1585         }
1586         if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
1587                 ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE "
1588                                 "(%i) is not supported.  Sorry.",
1589                                 ni->itype.index.block_size, NTFS_BLOCK_SIZE);
1590                 err = -EOPNOTSUPP;
1591                 goto unm_err_out;
1592         }
1593         ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1;
1594         /* Determine the size of a vcn in the index. */
1595         if (vol->cluster_size <= ni->itype.index.block_size) {
1596                 ni->itype.index.vcn_size = vol->cluster_size;
1597                 ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
1598         } else {
1599                 ni->itype.index.vcn_size = vol->sector_size;
1600                 ni->itype.index.vcn_size_bits = vol->sector_size_bits;
1601         }
1602         /* Check for presence of index allocation attribute. */
1603         if (!(ir->index.flags & LARGE_INDEX)) {
1604                 /* No index allocation. */
1605                 vi->i_size = ni->initialized_size = ni->allocated_size = 0;
1606                 /* We are done with the mft record, so we release it. */
1607                 ntfs_attr_put_search_ctx(ctx);
1608                 unmap_mft_record(base_ni);
1609                 m = NULL;
1610                 ctx = NULL;
1611                 goto skip_large_index_stuff;
1612         } /* LARGE_INDEX:  Index allocation present.  Setup state. */
1613         NInoSetIndexAllocPresent(ni);
1614         /* Find index allocation attribute. */
1615         ntfs_attr_reinit_search_ctx(ctx);
1616         err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len,
1617                         CASE_SENSITIVE, 0, NULL, 0, ctx);
1618         if (unlikely(err)) {
1619                 if (err == -ENOENT)
1620                         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1621                                         "not present but $INDEX_ROOT "
1622                                         "indicated it is.");
1623                 else
1624                         ntfs_error(vi->i_sb, "Failed to lookup "
1625                                         "$INDEX_ALLOCATION attribute.");
1626                 goto unm_err_out;
1627         }
1628         a = ctx->attr;
1629         if (!a->non_resident) {
1630                 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1631                                 "resident.");
1632                 goto unm_err_out;
1633         }
1634         /*
1635          * Ensure the attribute name is placed before the mapping pairs array.
1636          */
1637         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1638                         le16_to_cpu(
1639                         a->data.non_resident.mapping_pairs_offset)))) {
1640                 ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
1641                                 "placed after the mapping pairs array.");
1642                 goto unm_err_out;
1643         }
1644         if (a->flags & ATTR_IS_ENCRYPTED) {
1645                 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1646                                 "encrypted.");
1647                 goto unm_err_out;
1648         }
1649         if (a->flags & ATTR_IS_SPARSE) {
1650                 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
1651                 goto unm_err_out;
1652         }
1653         if (a->flags & ATTR_COMPRESSION_MASK) {
1654                 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1655                                 "compressed.");
1656                 goto unm_err_out;
1657         }
1658         if (a->data.non_resident.lowest_vcn) {
1659                 ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
1660                                 "attribute has non zero lowest_vcn.");
1661                 goto unm_err_out;
1662         }
1663         vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
1664         ni->initialized_size = sle64_to_cpu(
1665                         a->data.non_resident.initialized_size);
1666         ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size);
1667         /*
1668          * We are done with the mft record, so we release it.  Otherwise
1669          * we would deadlock in ntfs_attr_iget().
1670          */
1671         ntfs_attr_put_search_ctx(ctx);
1672         unmap_mft_record(base_ni);
1673         m = NULL;
1674         ctx = NULL;
1675         /* Get the index bitmap attribute inode. */
1676         bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
1677         if (IS_ERR(bvi)) {
1678                 ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
1679                 err = PTR_ERR(bvi);
1680                 goto unm_err_out;
1681         }
1682         bni = NTFS_I(bvi);
1683         if (NInoCompressed(bni) || NInoEncrypted(bni) ||
1684                         NInoSparse(bni)) {
1685                 ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
1686                                 "encrypted and/or sparse.");
1687                 goto iput_unm_err_out;
1688         }
1689         /* Consistency check bitmap size vs. index allocation size. */
1690         bvi_size = i_size_read(bvi);
1691         if ((bvi_size << 3) < (vi->i_size >> ni->itype.index.block_size_bits)) {
1692                 ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for "
1693                                 "index allocation (0x%llx).", bvi_size << 3,
1694                                 vi->i_size);
1695                 goto iput_unm_err_out;
1696         }
1697         iput(bvi);
1698 skip_large_index_stuff:
1699         /* Setup the operations for this index inode. */
1700         vi->i_mapping->a_ops = &ntfs_mst_aops;
1701         vi->i_blocks = ni->allocated_size >> 9;
1702         /*
1703          * Make sure the base inode doesn't go away and attach it to the
1704          * index inode.
1705          */
1706         igrab(base_vi);
1707         ni->ext.base_ntfs_ino = base_ni;
1708         ni->nr_extents = -1;
1709 
1710         ntfs_debug("Done.");
1711         return 0;
1712 iput_unm_err_out:
1713         iput(bvi);
1714 unm_err_out:
1715         if (!err)
1716                 err = -EIO;
1717         if (ctx)
1718                 ntfs_attr_put_search_ctx(ctx);
1719         if (m)
1720                 unmap_mft_record(base_ni);
1721 err_out:
1722         ntfs_error(vi->i_sb, "Failed with error code %i while reading index "
1723                         "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino,
1724                         ni->name_len);
1725         make_bad_inode(vi);
1726         if (err != -EOPNOTSUPP && err != -ENOMEM)
1727                 NVolSetErrors(vol);
1728         return err;
1729 }
1730 
1731 /*
1732  * The MFT inode has special locking, so teach the lock validator
1733  * about this by splitting off the locking rules of the MFT from
1734  * the locking rules of other inodes. The MFT inode can never be
1735  * accessed from the VFS side (or even internally), only by the
1736  * map_mft functions.
1737  */
1738 static struct lock_class_key mft_ni_runlist_lock_key, mft_ni_mrec_lock_key;
1739 
1740 /**
1741  * ntfs_read_inode_mount - special read_inode for mount time use only
1742  * @vi:         inode to read
1743  *
1744  * Read inode FILE_MFT at mount time, only called with super_block lock
1745  * held from within the read_super() code path.
1746  *
1747  * This function exists because when it is called the page cache for $MFT/$DATA
1748  * is not initialized and hence we cannot get at the contents of mft records
1749  * by calling map_mft_record*().
1750  *
1751  * Further it needs to cope with the circular references problem, i.e. cannot
1752  * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because
1753  * we do not know where the other extent mft records are yet and again, because
1754  * we cannot call map_mft_record*() yet.  Obviously this applies only when an
1755  * attribute list is actually present in $MFT inode.
1756  *
1757  * We solve these problems by starting with the $DATA attribute before anything
1758  * else and iterating using ntfs_attr_lookup($DATA) over all extents.  As each
1759  * extent is found, we ntfs_mapping_pairs_decompress() including the implied
1760  * ntfs_runlists_merge().  Each step of the iteration necessarily provides
1761  * sufficient information for the next step to complete.
1762  *
1763  * This should work but there are two possible pit falls (see inline comments
1764  * below), but only time will tell if they are real pits or just smoke...
1765  */
1766 int ntfs_read_inode_mount(struct inode *vi)
1767 {
1768         VCN next_vcn, last_vcn, highest_vcn;
1769         s64 block;
1770         struct super_block *sb = vi->i_sb;
1771         ntfs_volume *vol = NTFS_SB(sb);
1772         struct buffer_head *bh;
1773         ntfs_inode *ni;
1774         MFT_RECORD *m = NULL;
1775         ATTR_RECORD *a;
1776         ntfs_attr_search_ctx *ctx;
1777         unsigned int i, nr_blocks;
1778         int err;
1779 
1780         ntfs_debug("Entering.");
1781 
1782         /* Initialize the ntfs specific part of @vi. */
1783         ntfs_init_big_inode(vi);
1784 
1785         ni = NTFS_I(vi);
1786 
1787         /* Setup the data attribute. It is special as it is mst protected. */
1788         NInoSetNonResident(ni);
1789         NInoSetMstProtected(ni);
1790         NInoSetSparseDisabled(ni);
1791         ni->type = AT_DATA;
1792         ni->name = NULL;
1793         ni->name_len = 0;
1794         /*
1795          * This sets up our little cheat allowing us to reuse the async read io
1796          * completion handler for directories.
1797          */
1798         ni->itype.index.block_size = vol->mft_record_size;
1799         ni->itype.index.block_size_bits = vol->mft_record_size_bits;
1800 
1801         /* Very important! Needed to be able to call map_mft_record*(). */
1802         vol->mft_ino = vi;
1803 
1804         /* Allocate enough memory to read the first mft record. */
1805         if (vol->mft_record_size > 64 * 1024) {
1806                 ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).",
1807                                 vol->mft_record_size);
1808                 goto err_out;
1809         }
1810         i = vol->mft_record_size;
1811         if (i < sb->s_blocksize)
1812                 i = sb->s_blocksize;
1813         m = (MFT_RECORD*)ntfs_malloc_nofs(i);
1814         if (!m) {
1815                 ntfs_error(sb, "Failed to allocate buffer for $MFT record 0.");
1816                 goto err_out;
1817         }
1818 
1819         /* Determine the first block of the $MFT/$DATA attribute. */
1820         block = vol->mft_lcn << vol->cluster_size_bits >>
1821                         sb->s_blocksize_bits;
1822         nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits;
1823         if (!nr_blocks)
1824                 nr_blocks = 1;
1825 
1826         /* Load $MFT/$DATA's first mft record. */
1827         for (i = 0; i < nr_blocks; i++) {
1828                 bh = sb_bread(sb, block++);
1829                 if (!bh) {
1830                         ntfs_error(sb, "Device read failed.");
1831                         goto err_out;
1832                 }
1833                 memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data,
1834                                 sb->s_blocksize);
1835                 brelse(bh);
1836         }
1837 
1838         /* Apply the mst fixups. */
1839         if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
1840                 /* FIXME: Try to use the $MFTMirr now. */
1841                 ntfs_error(sb, "MST fixup failed. $MFT is corrupt.");
1842                 goto err_out;
1843         }
1844 
1845         /* Need this to sanity check attribute list references to $MFT. */
1846         vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
1847 
1848         /* Provides readpage() for map_mft_record(). */
1849         vi->i_mapping->a_ops = &ntfs_mst_aops;
1850 
1851         ctx = ntfs_attr_get_search_ctx(ni, m);
1852         if (!ctx) {
1853                 err = -ENOMEM;
1854                 goto err_out;
1855         }
1856 
1857         /* Find the attribute list attribute if present. */
1858         err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
1859         if (err) {
1860                 if (unlikely(err != -ENOENT)) {
1861                         ntfs_error(sb, "Failed to lookup attribute list "
1862                                         "attribute. You should run chkdsk.");
1863                         goto put_err_out;
1864                 }
1865         } else /* if (!err) */ {
1866                 ATTR_LIST_ENTRY *al_entry, *next_al_entry;
1867                 u8 *al_end;
1868                 static const char *es = "  Not allowed.  $MFT is corrupt.  "
1869                                 "You should run chkdsk.";
1870 
1871                 ntfs_debug("Attribute list attribute found in $MFT.");
1872                 NInoSetAttrList(ni);
1873                 a = ctx->attr;
1874                 if (a->flags & ATTR_COMPRESSION_MASK) {
1875                         ntfs_error(sb, "Attribute list attribute is "
1876                                         "compressed.%s", es);
1877                         goto put_err_out;
1878                 }
1879                 if (a->flags & ATTR_IS_ENCRYPTED ||
1880                                 a->flags & ATTR_IS_SPARSE) {
1881                         if (a->non_resident) {
1882                                 ntfs_error(sb, "Non-resident attribute list "
1883                                                 "attribute is encrypted/"
1884                                                 "sparse.%s", es);
1885                                 goto put_err_out;
1886                         }
1887                         ntfs_warning(sb, "Resident attribute list attribute "
1888                                         "in $MFT system file is marked "
1889                                         "encrypted/sparse which is not true.  "
1890                                         "However, Windows allows this and "
1891                                         "chkdsk does not detect or correct it "
1892                                         "so we will just ignore the invalid "
1893                                         "flags and pretend they are not set.");
1894                 }
1895                 /* Now allocate memory for the attribute list. */
1896                 ni->attr_list_size = (u32)ntfs_attr_size(a);
1897                 ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
1898                 if (!ni->attr_list) {
1899                         ntfs_error(sb, "Not enough memory to allocate buffer "
1900                                         "for attribute list.");
1901                         goto put_err_out;
1902                 }
1903                 if (a->non_resident) {
1904                         NInoSetAttrListNonResident(ni);
1905                         if (a->data.non_resident.lowest_vcn) {
1906                                 ntfs_error(sb, "Attribute list has non zero "
1907                                                 "lowest_vcn. $MFT is corrupt. "
1908                                                 "You should run chkdsk.");
1909                                 goto put_err_out;
1910                         }
1911                         /* Setup the runlist. */
1912                         ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
1913                                         a, NULL);
1914                         if (IS_ERR(ni->attr_list_rl.rl)) {
1915                                 err = PTR_ERR(ni->attr_list_rl.rl);
1916                                 ni->attr_list_rl.rl = NULL;
1917                                 ntfs_error(sb, "Mapping pairs decompression "
1918                                                 "failed with error code %i.",
1919                                                 -err);
1920                                 goto put_err_out;
1921                         }
1922                         /* Now load the attribute list. */
1923                         if ((err = load_attribute_list(vol, &ni->attr_list_rl,
1924                                         ni->attr_list, ni->attr_list_size,
1925                                         sle64_to_cpu(a->data.
1926                                         non_resident.initialized_size)))) {
1927                                 ntfs_error(sb, "Failed to load attribute list "
1928                                                 "attribute with error code %i.",
1929                                                 -err);
1930                                 goto put_err_out;
1931                         }
1932                 } else /* if (!ctx.attr->non_resident) */ {
1933                         if ((u8*)a + le16_to_cpu(
1934                                         a->data.resident.value_offset) +
1935                                         le32_to_cpu(
1936                                         a->data.resident.value_length) >
1937                                         (u8*)ctx->mrec + vol->mft_record_size) {
1938                                 ntfs_error(sb, "Corrupt attribute list "
1939                                                 "attribute.");
1940                                 goto put_err_out;
1941                         }
1942                         /* Now copy the attribute list. */
1943                         memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
1944                                         a->data.resident.value_offset),
1945                                         le32_to_cpu(
1946                                         a->data.resident.value_length));
1947                 }
1948                 /* The attribute list is now setup in memory. */
1949                 /*
1950                  * FIXME: I don't know if this case is actually possible.
1951                  * According to logic it is not possible but I have seen too
1952                  * many weird things in MS software to rely on logic... Thus we
1953                  * perform a manual search and make sure the first $MFT/$DATA
1954                  * extent is in the base inode. If it is not we abort with an
1955                  * error and if we ever see a report of this error we will need
1956                  * to do some magic in order to have the necessary mft record
1957                  * loaded and in the right place in the page cache. But
1958                  * hopefully logic will prevail and this never happens...
1959                  */
1960                 al_entry = (ATTR_LIST_ENTRY*)ni->attr_list;
1961                 al_end = (u8*)al_entry + ni->attr_list_size;
1962                 for (;; al_entry = next_al_entry) {
1963                         /* Out of bounds check. */
1964                         if ((u8*)al_entry < ni->attr_list ||
1965                                         (u8*)al_entry > al_end)
1966                                 goto em_put_err_out;
1967                         /* Catch the end of the attribute list. */
1968                         if ((u8*)al_entry == al_end)
1969                                 goto em_put_err_out;
1970                         if (!al_entry->length)
1971                                 goto em_put_err_out;
1972                         if ((u8*)al_entry + 6 > al_end || (u8*)al_entry +
1973                                         le16_to_cpu(al_entry->length) > al_end)
1974                                 goto em_put_err_out;
1975                         next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry +
1976                                         le16_to_cpu(al_entry->length));
1977                         if (le32_to_cpu(al_entry->type) > le32_to_cpu(AT_DATA))
1978                                 goto em_put_err_out;
1979                         if (AT_DATA != al_entry->type)
1980                                 continue;
1981                         /* We want an unnamed attribute. */
1982                         if (al_entry->name_length)
1983                                 goto em_put_err_out;
1984                         /* Want the first entry, i.e. lowest_vcn == 0. */
1985                         if (al_entry->lowest_vcn)
1986                                 goto em_put_err_out;
1987                         /* First entry has to be in the base mft record. */
1988                         if (MREF_LE(al_entry->mft_reference) != vi->i_ino) {
1989                                 /* MFT references do not match, logic fails. */
1990                                 ntfs_error(sb, "BUG: The first $DATA extent "
1991                                                 "of $MFT is not in the base "
1992                                                 "mft record. Please report "
1993                                                 "you saw this message to "
1994                                                 "linux-ntfs-dev@lists."
1995                                                 "sourceforge.net");
1996                                 goto put_err_out;
1997                         } else {
1998                                 /* Sequence numbers must match. */
1999                                 if (MSEQNO_LE(al_entry->mft_reference) !=
2000                                                 ni->seq_no)
2001                                         goto em_put_err_out;
2002                                 /* Got it. All is ok. We can stop now. */
2003                                 break;
2004                         }
2005                 }
2006         }
2007 
2008         ntfs_attr_reinit_search_ctx(ctx);
2009 
2010         /* Now load all attribute extents. */
2011         a = NULL;
2012         next_vcn = last_vcn = highest_vcn = 0;
2013         while (!(err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, next_vcn, NULL, 0,
2014                         ctx))) {
2015                 runlist_element *nrl;
2016 
2017                 /* Cache the current attribute. */
2018                 a = ctx->attr;
2019                 /* $MFT must be non-resident. */
2020                 if (!a->non_resident) {
2021                         ntfs_error(sb, "$MFT must be non-resident but a "
2022                                         "resident extent was found. $MFT is "
2023                                         "corrupt. Run chkdsk.");
2024                         goto put_err_out;
2025                 }
2026                 /* $MFT must be uncompressed and unencrypted. */
2027                 if (a->flags & ATTR_COMPRESSION_MASK ||
2028                                 a->flags & ATTR_IS_ENCRYPTED ||
2029                                 a->flags & ATTR_IS_SPARSE) {
2030                         ntfs_error(sb, "$MFT must be uncompressed, "
2031                                         "non-sparse, and unencrypted but a "
2032                                         "compressed/sparse/encrypted extent "
2033                                         "was found. $MFT is corrupt. Run "
2034                                         "chkdsk.");
2035                         goto put_err_out;
2036                 }
2037                 /*
2038                  * Decompress the mapping pairs array of this extent and merge
2039                  * the result into the existing runlist. No need for locking
2040                  * as we have exclusive access to the inode at this time and we
2041                  * are a mount in progress task, too.
2042                  */
2043                 nrl = ntfs_mapping_pairs_decompress(vol, a, ni->runlist.rl);
2044                 if (IS_ERR(nrl)) {
2045                         ntfs_error(sb, "ntfs_mapping_pairs_decompress() "
2046                                         "failed with error code %ld.  $MFT is "
2047                                         "corrupt.", PTR_ERR(nrl));
2048                         goto put_err_out;
2049                 }
2050                 ni->runlist.rl = nrl;
2051 
2052                 /* Are we in the first extent? */
2053                 if (!next_vcn) {
2054                         if (a->data.non_resident.lowest_vcn) {
2055                                 ntfs_error(sb, "First extent of $DATA "
2056                                                 "attribute has non zero "
2057                                                 "lowest_vcn. $MFT is corrupt. "
2058                                                 "You should run chkdsk.");
2059                                 goto put_err_out;
2060                         }
2061                         /* Get the last vcn in the $DATA attribute. */
2062                         last_vcn = sle64_to_cpu(
2063                                         a->data.non_resident.allocated_size)
2064                                         >> vol->cluster_size_bits;
2065                         /* Fill in the inode size. */
2066                         vi->i_size = sle64_to_cpu(
2067                                         a->data.non_resident.data_size);
2068                         ni->initialized_size = sle64_to_cpu(
2069                                         a->data.non_resident.initialized_size);
2070                         ni->allocated_size = sle64_to_cpu(
2071                                         a->data.non_resident.allocated_size);
2072                         /*
2073                          * Verify the number of mft records does not exceed
2074                          * 2^32 - 1.
2075                          */
2076                         if ((vi->i_size >> vol->mft_record_size_bits) >=
2077                                         (1ULL << 32)) {
2078                                 ntfs_error(sb, "$MFT is too big! Aborting.");
2079                                 goto put_err_out;
2080                         }
2081                         /*
2082                          * We have got the first extent of the runlist for
2083                          * $MFT which means it is now relatively safe to call
2084                          * the normal ntfs_read_inode() function.
2085                          * Complete reading the inode, this will actually
2086                          * re-read the mft record for $MFT, this time entering
2087                          * it into the page cache with which we complete the
2088                          * kick start of the volume. It should be safe to do
2089                          * this now as the first extent of $MFT/$DATA is
2090                          * already known and we would hope that we don't need
2091                          * further extents in order to find the other
2092                          * attributes belonging to $MFT. Only time will tell if
2093                          * this is really the case. If not we will have to play
2094                          * magic at this point, possibly duplicating a lot of
2095                          * ntfs_read_inode() at this point. We will need to
2096                          * ensure we do enough of its work to be able to call
2097                          * ntfs_read_inode() on extents of $MFT/$DATA. But lets
2098                          * hope this never happens...
2099                          */
2100                         ntfs_read_locked_inode(vi);
2101                         if (is_bad_inode(vi)) {
2102                                 ntfs_error(sb, "ntfs_read_inode() of $MFT "
2103                                                 "failed. BUG or corrupt $MFT. "
2104                                                 "Run chkdsk and if no errors "
2105                                                 "are found, please report you "
2106                                                 "saw this message to "
2107                                                 "linux-ntfs-dev@lists."
2108                                                 "sourceforge.net");
2109                                 ntfs_attr_put_search_ctx(ctx);
2110                                 /* Revert to the safe super operations. */
2111                                 ntfs_free(m);
2112                                 return -1;
2113                         }
2114                         /*
2115                          * Re-initialize some specifics about $MFT's inode as
2116                          * ntfs_read_inode() will have set up the default ones.
2117                          */
2118                         /* Set uid and gid to root. */
2119                         vi->i_uid = GLOBAL_ROOT_UID;
2120                         vi->i_gid = GLOBAL_ROOT_GID;
2121                         /* Regular file. No access for anyone. */
2122                         vi->i_mode = S_IFREG;
2123                         /* No VFS initiated operations allowed for $MFT. */
2124                         vi->i_op = &ntfs_empty_inode_ops;
2125                         vi->i_fop = &ntfs_empty_file_ops;
2126                 }
2127 
2128                 /* Get the lowest vcn for the next extent. */
2129                 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
2130                 next_vcn = highest_vcn + 1;
2131 
2132                 /* Only one extent or error, which we catch below. */
2133                 if (next_vcn <= 0)
2134                         break;
2135 
2136                 /* Avoid endless loops due to corruption. */
2137                 if (next_vcn < sle64_to_cpu(
2138                                 a->data.non_resident.lowest_vcn)) {
2139                         ntfs_error(sb, "$MFT has corrupt attribute list "
2140                                         "attribute. Run chkdsk.");
2141                         goto put_err_out;
2142                 }
2143         }
2144         if (err != -ENOENT) {
2145                 ntfs_error(sb, "Failed to lookup $MFT/$DATA attribute extent. "
2146                                 "$MFT is corrupt. Run chkdsk.");
2147                 goto put_err_out;
2148         }
2149         if (!a) {
2150                 ntfs_error(sb, "$MFT/$DATA attribute not found. $MFT is "
2151                                 "corrupt. Run chkdsk.");
2152                 goto put_err_out;
2153         }
2154         if (highest_vcn && highest_vcn != last_vcn - 1) {
2155                 ntfs_error(sb, "Failed to load the complete runlist for "
2156                                 "$MFT/$DATA. Driver bug or corrupt $MFT. "
2157                                 "Run chkdsk.");
2158                 ntfs_debug("highest_vcn = 0x%llx, last_vcn - 1 = 0x%llx",
2159                                 (unsigned long long)highest_vcn,
2160                                 (unsigned long long)last_vcn - 1);
2161                 goto put_err_out;
2162         }
2163         ntfs_attr_put_search_ctx(ctx);
2164         ntfs_debug("Done.");
2165         ntfs_free(m);
2166 
2167         /*
2168          * Split the locking rules of the MFT inode from the
2169          * locking rules of other inodes:
2170          */
2171         lockdep_set_class(&ni->runlist.lock, &mft_ni_runlist_lock_key);
2172         lockdep_set_class(&ni->mrec_lock, &mft_ni_mrec_lock_key);
2173 
2174         return 0;
2175 
2176 em_put_err_out:
2177         ntfs_error(sb, "Couldn't find first extent of $DATA attribute in "
2178                         "attribute list. $MFT is corrupt. Run chkdsk.");
2179 put_err_out:
2180         ntfs_attr_put_search_ctx(ctx);
2181 err_out:
2182         ntfs_error(sb, "Failed. Marking inode as bad.");
2183         make_bad_inode(vi);
2184         ntfs_free(m);
2185         return -1;
2186 }
2187 
2188 static void __ntfs_clear_inode(ntfs_inode *ni)
2189 {
2190         /* Free all alocated memory. */
2191         down_write(&ni->runlist.lock);
2192         if (ni->runlist.rl) {
2193                 ntfs_free(ni->runlist.rl);
2194                 ni->runlist.rl = NULL;
2195         }
2196         up_write(&ni->runlist.lock);
2197 
2198         if (ni->attr_list) {
2199                 ntfs_free(ni->attr_list);
2200                 ni->attr_list = NULL;
2201         }
2202 
2203         down_write(&ni->attr_list_rl.lock);
2204         if (ni->attr_list_rl.rl) {
2205                 ntfs_free(ni->attr_list_rl.rl);
2206                 ni->attr_list_rl.rl = NULL;
2207         }
2208         up_write(&ni->attr_list_rl.lock);
2209 
2210         if (ni->name_len && ni->name != I30) {
2211                 /* Catch bugs... */
2212                 BUG_ON(!ni->name);
2213                 kfree(ni->name);
2214         }
2215 }
2216 
2217 void ntfs_clear_extent_inode(ntfs_inode *ni)
2218 {
2219         ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
2220 
2221         BUG_ON(NInoAttr(ni));
2222         BUG_ON(ni->nr_extents != -1);
2223 
2224 #ifdef NTFS_RW
2225         if (NInoDirty(ni)) {
2226                 if (!is_bad_inode(VFS_I(ni->ext.base_ntfs_ino)))
2227                         ntfs_error(ni->vol->sb, "Clearing dirty extent inode!  "
2228                                         "Losing data!  This is a BUG!!!");
2229                 // FIXME:  Do something!!!
2230         }
2231 #endif /* NTFS_RW */
2232 
2233         __ntfs_clear_inode(ni);
2234 
2235         /* Bye, bye... */
2236         ntfs_destroy_extent_inode(ni);
2237 }
2238 
2239 /**
2240  * ntfs_evict_big_inode - clean up the ntfs specific part of an inode
2241  * @vi:         vfs inode pending annihilation
2242  *
2243  * When the VFS is going to remove an inode from memory, ntfs_clear_big_inode()
2244  * is called, which deallocates all memory belonging to the NTFS specific part
2245  * of the inode and returns.
2246  *
2247  * If the MFT record is dirty, we commit it before doing anything else.
2248  */
2249 void ntfs_evict_big_inode(struct inode *vi)
2250 {
2251         ntfs_inode *ni = NTFS_I(vi);
2252 
2253         truncate_inode_pages_final(&vi->i_data);
2254         clear_inode(vi);
2255 
2256 #ifdef NTFS_RW
2257         if (NInoDirty(ni)) {
2258                 bool was_bad = (is_bad_inode(vi));
2259 
2260                 /* Committing the inode also commits all extent inodes. */
2261                 ntfs_commit_inode(vi);
2262 
2263                 if (!was_bad && (is_bad_inode(vi) || NInoDirty(ni))) {
2264                         ntfs_error(vi->i_sb, "Failed to commit dirty inode "
2265                                         "0x%lx.  Losing data!", vi->i_ino);
2266                         // FIXME:  Do something!!!
2267                 }
2268         }
2269 #endif /* NTFS_RW */
2270 
2271         /* No need to lock at this stage as no one else has a reference. */
2272         if (ni->nr_extents > 0) {
2273                 int i;
2274 
2275                 for (i = 0; i < ni->nr_extents; i++)
2276                         ntfs_clear_extent_inode(ni->ext.extent_ntfs_inos[i]);
2277                 kfree(ni->ext.extent_ntfs_inos);
2278         }
2279 
2280         __ntfs_clear_inode(ni);
2281 
2282         if (NInoAttr(ni)) {
2283                 /* Release the base inode if we are holding it. */
2284                 if (ni->nr_extents == -1) {
2285                         iput(VFS_I(ni->ext.base_ntfs_ino));
2286                         ni->nr_extents = 0;
2287                         ni->ext.base_ntfs_ino = NULL;
2288                 }
2289         }
2290         return;
2291 }
2292 
2293 /**
2294  * ntfs_show_options - show mount options in /proc/mounts
2295  * @sf:         seq_file in which to write our mount options
2296  * @root:       root of the mounted tree whose mount options to display
2297  *
2298  * Called by the VFS once for each mounted ntfs volume when someone reads
2299  * /proc/mounts in order to display the NTFS specific mount options of each
2300  * mount. The mount options of fs specified by @root are written to the seq file
2301  * @sf and success is returned.
2302  */
2303 int ntfs_show_options(struct seq_file *sf, struct dentry *root)
2304 {
2305         ntfs_volume *vol = NTFS_SB(root->d_sb);
2306         int i;
2307 
2308         seq_printf(sf, ",uid=%i", from_kuid_munged(&init_user_ns, vol->uid));
2309         seq_printf(sf, ",gid=%i", from_kgid_munged(&init_user_ns, vol->gid));
2310         if (vol->fmask == vol->dmask)
2311                 seq_printf(sf, ",umask=0%o", vol->fmask);
2312         else {
2313                 seq_printf(sf, ",fmask=0%o", vol->fmask);
2314                 seq_printf(sf, ",dmask=0%o", vol->dmask);
2315         }
2316         seq_printf(sf, ",nls=%s", vol->nls_map->charset);
2317         if (NVolCaseSensitive(vol))
2318                 seq_printf(sf, ",case_sensitive");
2319         if (NVolShowSystemFiles(vol))
2320                 seq_printf(sf, ",show_sys_files");
2321         if (!NVolSparseEnabled(vol))
2322                 seq_printf(sf, ",disable_sparse");
2323         for (i = 0; on_errors_arr[i].val; i++) {
2324                 if (on_errors_arr[i].val & vol->on_errors)
2325                         seq_printf(sf, ",errors=%s", on_errors_arr[i].str);
2326         }
2327         seq_printf(sf, ",mft_zone_multiplier=%i", vol->mft_zone_multiplier);
2328         return 0;
2329 }
2330 
2331 #ifdef NTFS_RW
2332 
2333 static const char *es = "  Leaving inconsistent metadata.  Unmount and run "
2334                 "chkdsk.";
2335 
2336 /**
2337  * ntfs_truncate - called when the i_size of an ntfs inode is changed
2338  * @vi:         inode for which the i_size was changed
2339  *
2340  * We only support i_size changes for normal files at present, i.e. not
2341  * compressed and not encrypted.  This is enforced in ntfs_setattr(), see
2342  * below.
2343  *
2344  * The kernel guarantees that @vi is a regular file (S_ISREG() is true) and
2345  * that the change is allowed.
2346  *
2347  * This implies for us that @vi is a file inode rather than a directory, index,
2348  * or attribute inode as well as that @vi is a base inode.
2349  *
2350  * Returns 0 on success or -errno on error.
2351  *
2352  * Called with ->i_mutex held.
2353  */
2354 int ntfs_truncate(struct inode *vi)
2355 {
2356         s64 new_size, old_size, nr_freed, new_alloc_size, old_alloc_size;
2357         VCN highest_vcn;
2358         unsigned long flags;
2359         ntfs_inode *base_ni, *ni = NTFS_I(vi);
2360         ntfs_volume *vol = ni->vol;
2361         ntfs_attr_search_ctx *ctx;
2362         MFT_RECORD *m;
2363         ATTR_RECORD *a;
2364         const char *te = "  Leaving file length out of sync with i_size.";
2365         int err, mp_size, size_change, alloc_change;
2366         u32 attr_len;
2367 
2368         ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
2369         BUG_ON(NInoAttr(ni));
2370         BUG_ON(S_ISDIR(vi->i_mode));
2371         BUG_ON(NInoMstProtected(ni));
2372         BUG_ON(ni->nr_extents < 0);
2373 retry_truncate:
2374         /*
2375          * Lock the runlist for writing and map the mft record to ensure it is
2376          * safe to mess with the attribute runlist and sizes.
2377          */
2378         down_write(&ni->runlist.lock);
2379         if (!NInoAttr(ni))
2380                 base_ni = ni;
2381         else
2382                 base_ni = ni->ext.base_ntfs_ino;
2383         m = map_mft_record(base_ni);
2384         if (IS_ERR(m)) {
2385                 err = PTR_ERR(m);
2386                 ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx "
2387                                 "(error code %d).%s", vi->i_ino, err, te);
2388                 ctx = NULL;
2389                 m = NULL;
2390                 goto old_bad_out;
2391         }
2392         ctx = ntfs_attr_get_search_ctx(base_ni, m);
2393         if (unlikely(!ctx)) {
2394                 ntfs_error(vi->i_sb, "Failed to allocate a search context for "
2395                                 "inode 0x%lx (not enough memory).%s",
2396                                 vi->i_ino, te);
2397                 err = -ENOMEM;
2398                 goto old_bad_out;
2399         }
2400         err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
2401                         CASE_SENSITIVE, 0, NULL, 0, ctx);
2402         if (unlikely(err)) {
2403                 if (err == -ENOENT) {
2404                         ntfs_error(vi->i_sb, "Open attribute is missing from "
2405                                         "mft record.  Inode 0x%lx is corrupt.  "
2406                                         "Run chkdsk.%s", vi->i_ino, te);
2407                         err = -EIO;
2408                 } else
2409                         ntfs_error(vi->i_sb, "Failed to lookup attribute in "
2410                                         "inode 0x%lx (error code %d).%s",
2411                                         vi->i_ino, err, te);
2412                 goto old_bad_out;
2413         }
2414         m = ctx->mrec;
2415         a = ctx->attr;
2416         /*
2417          * The i_size of the vfs inode is the new size for the attribute value.
2418          */
2419         new_size = i_size_read(vi);
2420         /* The current size of the attribute value is the old size. */
2421         old_size = ntfs_attr_size(a);
2422         /* Calculate the new allocated size. */
2423         if (NInoNonResident(ni))
2424                 new_alloc_size = (new_size + vol->cluster_size - 1) &
2425                                 ~(s64)vol->cluster_size_mask;
2426         else
2427                 new_alloc_size = (new_size + 7) & ~7;
2428         /* The current allocated size is the old allocated size. */
2429         read_lock_irqsave(&ni->size_lock, flags);
2430         old_alloc_size = ni->allocated_size;
2431         read_unlock_irqrestore(&ni->size_lock, flags);
2432         /*
2433          * The change in the file size.  This will be 0 if no change, >0 if the
2434          * size is growing, and <0 if the size is shrinking.
2435          */
2436         size_change = -1;
2437         if (new_size - old_size >= 0) {
2438                 size_change = 1;
2439                 if (new_size == old_size)
2440                         size_change = 0;
2441         }
2442         /* As above for the allocated size. */
2443         alloc_change = -1;
2444         if (new_alloc_size - old_alloc_size >= 0) {
2445                 alloc_change = 1;
2446                 if (new_alloc_size == old_alloc_size)
2447                         alloc_change = 0;
2448         }
2449         /*
2450          * If neither the size nor the allocation are being changed there is
2451          * nothing to do.
2452          */
2453         if (!size_change && !alloc_change)
2454                 goto unm_done;
2455         /* If the size is changing, check if new size is allowed in $AttrDef. */
2456         if (size_change) {
2457                 err = ntfs_attr_size_bounds_check(vol, ni->type, new_size);
2458                 if (unlikely(err)) {
2459                         if (err == -ERANGE) {
2460                                 ntfs_error(vol->sb, "Truncate would cause the "
2461                                                 "inode 0x%lx to %simum size "
2462                                                 "for its attribute type "
2463                                                 "(0x%x).  Aborting truncate.",
2464                                                 vi->i_ino,
2465                                                 new_size > old_size ? "exceed "
2466                                                 "the max" : "go under the min",
2467                                                 le32_to_cpu(ni->type));
2468                                 err = -EFBIG;
2469                         } else {
2470                                 ntfs_error(vol->sb, "Inode 0x%lx has unknown "
2471                                                 "attribute type 0x%x.  "
2472                                                 "Aborting truncate.",
2473                                                 vi->i_ino,
2474                                                 le32_to_cpu(ni->type));
2475                                 err = -EIO;
2476                         }
2477                         /* Reset the vfs inode size to the old size. */
2478                         i_size_write(vi, old_size);
2479                         goto err_out;
2480                 }
2481         }
2482         if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2483                 ntfs_warning(vi->i_sb, "Changes in inode size are not "
2484                                 "supported yet for %s files, ignoring.",
2485                                 NInoCompressed(ni) ? "compressed" :
2486                                 "encrypted");
2487                 err = -EOPNOTSUPP;
2488                 goto bad_out;
2489         }
2490         if (a->non_resident)
2491                 goto do_non_resident_truncate;
2492         BUG_ON(NInoNonResident(ni));
2493         /* Resize the attribute record to best fit the new attribute size. */
2494         if (new_size < vol->mft_record_size &&
2495                         !ntfs_resident_attr_value_resize(m, a, new_size)) {
2496                 /* The resize succeeded! */
2497                 flush_dcache_mft_record_page(ctx->ntfs_ino);
2498                 mark_mft_record_dirty(ctx->ntfs_ino);
2499                 write_lock_irqsave(&ni->size_lock, flags);
2500                 /* Update the sizes in the ntfs inode and all is done. */
2501                 ni->allocated_size = le32_to_cpu(a->length) -
2502                                 le16_to_cpu(a->data.resident.value_offset);
2503                 /*
2504                  * Note ntfs_resident_attr_value_resize() has already done any
2505                  * necessary data clearing in the attribute record.  When the
2506                  * file is being shrunk vmtruncate() will already have cleared
2507                  * the top part of the last partial page, i.e. since this is
2508                  * the resident case this is the page with index 0.  However,
2509                  * when the file is being expanded, the page cache page data
2510                  * between the old data_size, i.e. old_size, and the new_size
2511                  * has not been zeroed.  Fortunately, we do not need to zero it
2512                  * either since on one hand it will either already be zero due
2513                  * to both readpage and writepage clearing partial page data
2514                  * beyond i_size in which case there is nothing to do or in the
2515                  * case of the file being mmap()ped at the same time, POSIX
2516                  * specifies that the behaviour is unspecified thus we do not
2517                  * have to do anything.  This means that in our implementation
2518                  * in the rare case that the file is mmap()ped and a write
2519                  * occurred into the mmap()ped region just beyond the file size
2520                  * and writepage has not yet been called to write out the page
2521                  * (which would clear the area beyond the file size) and we now
2522                  * extend the file size to incorporate this dirty region
2523                  * outside the file size, a write of the page would result in
2524                  * this data being written to disk instead of being cleared.
2525                  * Given both POSIX and the Linux mmap(2) man page specify that
2526                  * this corner case is undefined, we choose to leave it like
2527                  * that as this is much simpler for us as we cannot lock the
2528                  * relevant page now since we are holding too many ntfs locks
2529                  * which would result in a lock reversal deadlock.
2530                  */
2531                 ni->initialized_size = new_size;
2532                 write_unlock_irqrestore(&ni->size_lock, flags);
2533                 goto unm_done;
2534         }
2535         /* If the above resize failed, this must be an attribute extension. */
2536         BUG_ON(size_change < 0);
2537         /*
2538          * We have to drop all the locks so we can call
2539          * ntfs_attr_make_non_resident().  This could be optimised by try-
2540          * locking the first page cache page and only if that fails dropping
2541          * the locks, locking the page, and redoing all the locking and
2542          * lookups.  While this would be a huge optimisation, it is not worth
2543          * it as this is definitely a slow code path as it only ever can happen
2544          * once for any given file.
2545          */
2546         ntfs_attr_put_search_ctx(ctx);
2547         unmap_mft_record(base_ni);
2548         up_write(&ni->runlist.lock);
2549         /*
2550          * Not enough space in the mft record, try to make the attribute
2551          * non-resident and if successful restart the truncation process.
2552          */
2553         err = ntfs_attr_make_non_resident(ni, old_size);
2554         if (likely(!err))
2555                 goto retry_truncate;
2556         /*
2557          * Could not make non-resident.  If this is due to this not being
2558          * permitted for this attribute type or there not being enough space,
2559          * try to make other attributes non-resident.  Otherwise fail.
2560          */
2561         if (unlikely(err != -EPERM && err != -ENOSPC)) {
2562                 ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, attribute "
2563                                 "type 0x%x, because the conversion from "
2564                                 "resident to non-resident attribute failed "
2565                                 "with error code %i.", vi->i_ino,
2566                                 (unsigned)le32_to_cpu(ni->type), err);
2567                 if (err != -ENOMEM)
2568                         err = -EIO;
2569                 goto conv_err_out;
2570         }
2571         /* TODO: Not implemented from here, abort. */
2572         if (err == -ENOSPC)
2573                 ntfs_error(vol->sb, "Not enough space in the mft record/on "
2574                                 "disk for the non-resident attribute value.  "
2575                                 "This case is not implemented yet.");
2576         else /* if (err == -EPERM) */
2577                 ntfs_error(vol->sb, "This attribute type may not be "
2578                                 "non-resident.  This case is not implemented "
2579                                 "yet.");
2580         err = -EOPNOTSUPP;
2581         goto conv_err_out;
2582 #if 0
2583         // TODO: Attempt to make other attributes non-resident.
2584         if (!err)
2585                 goto do_resident_extend;
2586         /*
2587          * Both the attribute list attribute and the standard information
2588          * attribute must remain in the base inode.  Thus, if this is one of
2589          * these attributes, we have to try to move other attributes out into
2590          * extent mft records instead.
2591          */
2592         if (ni->type == AT_ATTRIBUTE_LIST ||
2593                         ni->type == AT_STANDARD_INFORMATION) {
2594                 // TODO: Attempt to move other attributes into extent mft
2595                 // records.
2596                 err = -EOPNOTSUPP;
2597                 if (!err)
2598                         goto do_resident_extend;
2599                 goto err_out;
2600         }
2601         // TODO: Attempt to move this attribute to an extent mft record, but
2602         // only if it is not already the only attribute in an mft record in
2603         // which case there would be nothing to gain.
2604         err = -EOPNOTSUPP;
2605         if (!err)
2606                 goto do_resident_extend;
2607         /* There is nothing we can do to make enough space. )-: */
2608         goto err_out;
2609 #endif
2610 do_non_resident_truncate:
2611         BUG_ON(!NInoNonResident(ni));
2612         if (alloc_change < 0) {
2613                 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
2614                 if (highest_vcn > 0 &&
2615                                 old_alloc_size >> vol->cluster_size_bits >
2616                                 highest_vcn + 1) {
2617                         /*
2618                          * This attribute has multiple extents.  Not yet
2619                          * supported.
2620                          */
2621                         ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, "
2622                                         "attribute type 0x%x, because the "
2623                                         "attribute is highly fragmented (it "
2624                                         "consists of multiple extents) and "
2625                                         "this case is not implemented yet.",
2626                                         vi->i_ino,
2627                                         (unsigned)le32_to_cpu(ni->type));
2628                         err = -EOPNOTSUPP;
2629                         goto bad_out;
2630                 }
2631         }
2632         /*
2633          * If the size is shrinking, need to reduce the initialized_size and
2634          * the data_size before reducing the allocation.
2635          */
2636         if (size_change < 0) {
2637                 /*
2638                  * Make the valid size smaller (i_size is already up-to-date).
2639                  */
2640                 write_lock_irqsave(&ni->size_lock, flags);
2641                 if (new_size < ni->initialized_size) {
2642                         ni->initialized_size = new_size;
2643                         a->data.non_resident.initialized_size =
2644                                         cpu_to_sle64(new_size);
2645                 }
2646                 a->data.non_resident.data_size = cpu_to_sle64(new_size);
2647                 write_unlock_irqrestore(&ni->size_lock, flags);
2648                 flush_dcache_mft_record_page(ctx->ntfs_ino);
2649                 mark_mft_record_dirty(ctx->ntfs_ino);
2650                 /* If the allocated size is not changing, we are done. */
2651                 if (!alloc_change)
2652                         goto unm_done;
2653                 /*
2654                  * If the size is shrinking it makes no sense for the
2655                  * allocation to be growing.
2656                  */
2657                 BUG_ON(alloc_change > 0);
2658         } else /* if (size_change >= 0) */ {
2659                 /*
2660                  * The file size is growing or staying the same but the
2661                  * allocation can be shrinking, growing or staying the same.
2662                  */
2663                 if (alloc_change > 0) {
2664                         /*
2665                          * We need to extend the allocation and possibly update
2666                          * the data size.  If we are updating the data size,
2667                          * since we are not touching the initialized_size we do
2668                          * not need to worry about the actual data on disk.
2669                          * And as far as the page cache is concerned, there
2670                          * will be no pages beyond the old data size and any
2671                          * partial region in the last page between the old and
2672                          * new data size (or the end of the page if the new
2673                          * data size is outside the page) does not need to be
2674                          * modified as explained above for the resident
2675                          * attribute truncate case.  To do this, we simply drop
2676                          * the locks we hold and leave all the work to our
2677                          * friendly helper ntfs_attr_extend_allocation().
2678                          */
2679                         ntfs_attr_put_search_ctx(ctx);
2680                         unmap_mft_record(base_ni);
2681                         up_write(&ni->runlist.lock);
2682                         err = ntfs_attr_extend_allocation(ni, new_size,
2683                                         size_change > 0 ? new_size : -1, -1);
2684                         /*
2685                          * ntfs_attr_extend_allocation() will have done error
2686                          * output already.
2687                          */
2688                         goto done;
2689                 }
2690                 if (!alloc_change)
2691                         goto alloc_done;
2692         }
2693         /* alloc_change < 0 */
2694         /* Free the clusters. */
2695         nr_freed = ntfs_cluster_free(ni, new_alloc_size >>
2696                         vol->cluster_size_bits, -1, ctx);
2697         m = ctx->mrec;
2698         a = ctx->attr;
2699         if (unlikely(nr_freed < 0)) {
2700                 ntfs_error(vol->sb, "Failed to release cluster(s) (error code "
2701                                 "%lli).  Unmount and run chkdsk to recover "
2702                                 "the lost cluster(s).", (long long)nr_freed);
2703                 NVolSetErrors(vol);
2704                 nr_freed = 0;
2705         }
2706         /* Truncate the runlist. */
2707         err = ntfs_rl_truncate_nolock(vol, &ni->runlist,
2708                         new_alloc_size >> vol->cluster_size_bits);
2709         /*
2710          * If the runlist truncation failed and/or the search context is no
2711          * longer valid, we cannot resize the attribute record or build the
2712          * mapping pairs array thus we mark the inode bad so that no access to
2713          * the freed clusters can happen.
2714          */
2715         if (unlikely(err || IS_ERR(m))) {
2716                 ntfs_error(vol->sb, "Failed to %s (error code %li).%s",
2717                                 IS_ERR(m) ?
2718                                 "restore attribute search context" :
2719                                 "truncate attribute runlist",
2720                                 IS_ERR(m) ? PTR_ERR(m) : err, es);
2721                 err = -EIO;
2722                 goto bad_out;
2723         }
2724         /* Get the size for the shrunk mapping pairs array for the runlist. */
2725         mp_size = ntfs_get_size_for_mapping_pairs(vol, ni->runlist.rl, 0, -1);
2726         if (unlikely(mp_size <= 0)) {
2727                 ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2728                                 "attribute type 0x%x, because determining the "
2729                                 "size for the mapping pairs failed with error "
2730                                 "code %i.%s", vi->i_ino,
2731                                 (unsigned)le32_to_cpu(ni->type), mp_size, es);
2732                 err = -EIO;
2733                 goto bad_out;
2734         }
2735         /*
2736          * Shrink the attribute record for the new mapping pairs array.  Note,
2737          * this cannot fail since we are making the attribute smaller thus by
2738          * definition there is enough space to do so.
2739          */
2740         attr_len = le32_to_cpu(a->length);
2741         err = ntfs_attr_record_resize(m, a, mp_size +
2742                         le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
2743         BUG_ON(err);
2744         /*
2745          * Generate the mapping pairs array directly into the attribute record.
2746          */
2747         err = ntfs_mapping_pairs_build(vol, (u8*)a +
2748                         le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
2749                         mp_size, ni->runlist.rl, 0, -1, NULL);
2750         if (unlikely(err)) {
2751                 ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2752                                 "attribute type 0x%x, because building the "
2753                                 "mapping pairs failed with error code %i.%s",
2754                                 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
2755                                 err, es);
2756                 err = -EIO;
2757                 goto bad_out;
2758         }
2759         /* Update the allocated/compressed size as well as the highest vcn. */
2760         a->data.non_resident.highest_vcn = cpu_to_sle64((new_alloc_size >>
2761                         vol->cluster_size_bits) - 1);
2762         write_lock_irqsave(&ni->size_lock, flags);
2763         ni->allocated_size = new_alloc_size;
2764         a->data.non_resident.allocated_size = cpu_to_sle64(new_alloc_size);
2765         if (NInoSparse(ni) || NInoCompressed(ni)) {
2766                 if (nr_freed) {
2767                         ni->itype.compressed.size -= nr_freed <<
2768                                         vol->cluster_size_bits;
2769                         BUG_ON(ni->itype.compressed.size < 0);
2770                         a->data.non_resident.compressed_size = cpu_to_sle64(
2771                                         ni->itype.compressed.size);
2772                         vi->i_blocks = ni->itype.compressed.size >> 9;
2773                 }
2774         } else
2775                 vi->i_blocks = new_alloc_size >> 9;
2776         write_unlock_irqrestore(&ni->size_lock, flags);
2777         /*
2778          * We have shrunk the allocation.  If this is a shrinking truncate we
2779          * have already dealt with the initialized_size and the data_size above
2780          * and we are done.  If the truncate is only changing the allocation
2781          * and not the data_size, we are also done.  If this is an extending
2782          * truncate, need to extend the data_size now which is ensured by the
2783          * fact that @size_change is positive.
2784          */
2785 alloc_done:
2786         /*
2787          * If the size is growing, need to update it now.  If it is shrinking,
2788          * we have already updated it above (before the allocation change).
2789          */
2790         if (size_change > 0)
2791                 a->data.non_resident.data_size = cpu_to_sle64(new_size);
2792         /* Ensure the modified mft record is written out. */
2793         flush_dcache_mft_record_page(ctx->ntfs_ino);
2794         mark_mft_record_dirty(ctx->ntfs_ino);
2795 unm_done:
2796         ntfs_attr_put_search_ctx(ctx);
2797         unmap_mft_record(base_ni);
2798         up_write(&ni->runlist.lock);
2799 done:
2800         /* Update the mtime and ctime on the base inode. */
2801         /* normally ->truncate shouldn't update ctime or mtime,
2802          * but ntfs did before so it got a copy & paste version
2803          * of file_update_time.  one day someone should fix this
2804          * for real.
2805          */
2806         if (!IS_NOCMTIME(VFS_I(base_ni)) && !IS_RDONLY(VFS_I(base_ni))) {
2807                 struct timespec64 now = current_time(VFS_I(base_ni));
2808                 int sync_it = 0;
2809 
2810                 if (!timespec64_equal(&VFS_I(base_ni)->i_mtime, &now) ||
2811                     !timespec64_equal(&VFS_I(base_ni)->i_ctime, &now))
2812                         sync_it = 1;
2813                 VFS_I(base_ni)->i_mtime = now;
2814                 VFS_I(base_ni)->i_ctime = now;
2815 
2816                 if (sync_it)
2817                         mark_inode_dirty_sync(VFS_I(base_ni));
2818         }
2819 
2820         if (likely(!err)) {
2821                 NInoClearTruncateFailed(ni);
2822                 ntfs_debug("Done.");
2823         }
2824         return err;
2825 old_bad_out:
2826         old_size = -1;
2827 bad_out:
2828         if (err != -ENOMEM && err != -EOPNOTSUPP)
2829                 NVolSetErrors(vol);
2830         if (err != -EOPNOTSUPP)
2831                 NInoSetTruncateFailed(ni);
2832         else if (old_size >= 0)
2833                 i_size_write(vi, old_size);
2834 err_out:
2835         if (ctx)
2836                 ntfs_attr_put_search_ctx(ctx);
2837         if (m)
2838                 unmap_mft_record(base_ni);
2839         up_write(&ni->runlist.lock);
2840 out:
2841         ntfs_debug("Failed.  Returning error code %i.", err);
2842         return err;
2843 conv_err_out:
2844         if (err != -ENOMEM && err != -EOPNOTSUPP)
2845                 NVolSetErrors(vol);
2846         if (err != -EOPNOTSUPP)
2847                 NInoSetTruncateFailed(ni);
2848         else
2849                 i_size_write(vi, old_size);
2850         goto out;
2851 }
2852 
2853 /**
2854  * ntfs_truncate_vfs - wrapper for ntfs_truncate() that has no return value
2855  * @vi:         inode for which the i_size was changed
2856  *
2857  * Wrapper for ntfs_truncate() that has no return value.
2858  *
2859  * See ntfs_truncate() description above for details.
2860  */
2861 #ifdef NTFS_RW
2862 void ntfs_truncate_vfs(struct inode *vi) {
2863         ntfs_truncate(vi);
2864 }
2865 #endif
2866 
2867 /**
2868  * ntfs_setattr - called from notify_change() when an attribute is being changed
2869  * @dentry:     dentry whose attributes to change
2870  * @attr:       structure describing the attributes and the changes
2871  *
2872  * We have to trap VFS attempts to truncate the file described by @dentry as
2873  * soon as possible, because we do not implement changes in i_size yet.  So we
2874  * abort all i_size changes here.
2875  *
2876  * We also abort all changes of user, group, and mode as we do not implement
2877  * the NTFS ACLs yet.
2878  *
2879  * Called with ->i_mutex held.
2880  */
2881 int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
2882 {
2883         struct inode *vi = d_inode(dentry);
2884         int err;
2885         unsigned int ia_valid = attr->ia_valid;
2886 
2887         err = setattr_prepare(dentry, attr);
2888         if (err)
2889                 goto out;
2890         /* We do not support NTFS ACLs yet. */
2891         if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) {
2892                 ntfs_warning(vi->i_sb, "Changes in user/group/mode are not "
2893                                 "supported yet, ignoring.");
2894                 err = -EOPNOTSUPP;
2895                 goto out;
2896         }
2897         if (ia_valid & ATTR_SIZE) {
2898                 if (attr->ia_size != i_size_read(vi)) {
2899                         ntfs_inode *ni = NTFS_I(vi);
2900                         /*
2901                          * FIXME: For now we do not support resizing of
2902                          * compressed or encrypted files yet.
2903                          */
2904                         if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2905                                 ntfs_warning(vi->i_sb, "Changes in inode size "
2906                                                 "are not supported yet for "
2907                                                 "%s files, ignoring.",
2908                                                 NInoCompressed(ni) ?
2909                                                 "compressed" : "encrypted");
2910                                 err = -EOPNOTSUPP;
2911                         } else {
2912                                 truncate_setsize(vi, attr->ia_size);
2913                                 ntfs_truncate_vfs(vi);
2914                         }
2915                         if (err || ia_valid == ATTR_SIZE)
2916                                 goto out;
2917                 } else {
2918                         /*
2919                          * We skipped the truncate but must still update
2920                          * timestamps.
2921                          */
2922                         ia_valid |= ATTR_MTIME | ATTR_CTIME;
2923                 }
2924         }
2925         if (ia_valid & ATTR_ATIME)
2926                 vi->i_atime = timespec64_trunc(attr->ia_atime,
2927                                                vi->i_sb->s_time_gran);
2928         if (ia_valid & ATTR_MTIME)
2929                 vi->i_mtime = timespec64_trunc(attr->ia_mtime,
2930                                                vi->i_sb->s_time_gran);
2931         if (ia_valid & ATTR_CTIME)
2932                 vi->i_ctime = timespec64_trunc(attr->ia_ctime,
2933                                                vi->i_sb->s_time_gran);
2934         mark_inode_dirty(vi);
2935 out:
2936         return err;
2937 }
2938 
2939 /**
2940  * ntfs_write_inode - write out a dirty inode
2941  * @vi:         inode to write out
2942  * @sync:       if true, write out synchronously
2943  *
2944  * Write out a dirty inode to disk including any extent inodes if present.
2945  *
2946  * If @sync is true, commit the inode to disk and wait for io completion.  This
2947  * is done using write_mft_record().
2948  *
2949  * If @sync is false, just schedule the write to happen but do not wait for i/o
2950  * completion.  In 2.6 kernels, scheduling usually happens just by virtue of
2951  * marking the page (and in this case mft record) dirty but we do not implement
2952  * this yet as write_mft_record() largely ignores the @sync parameter and
2953  * always performs synchronous writes.
2954  *
2955  * Return 0 on success and -errno on error.
2956  */
2957 int __ntfs_write_inode(struct inode *vi, int sync)
2958 {
2959         sle64 nt;
2960         ntfs_inode *ni = NTFS_I(vi);
2961         ntfs_attr_search_ctx *ctx;
2962         MFT_RECORD *m;
2963         STANDARD_INFORMATION *si;
2964         int err = 0;
2965         bool modified = false;
2966 
2967         ntfs_debug("Entering for %sinode 0x%lx.", NInoAttr(ni) ? "attr " : "",
2968                         vi->i_ino);
2969         /*
2970          * Dirty attribute inodes are written via their real inodes so just
2971          * clean them here.  Access time updates are taken care off when the
2972          * real inode is written.
2973          */
2974         if (NInoAttr(ni)) {
2975                 NInoClearDirty(ni);
2976                 ntfs_debug("Done.");
2977                 return 0;
2978         }
2979         /* Map, pin, and lock the mft record belonging to the inode. */
2980         m = map_mft_record(ni);
2981         if (IS_ERR(m)) {
2982                 err = PTR_ERR(m);
2983                 goto err_out;
2984         }
2985         /* Update the access times in the standard information attribute. */
2986         ctx = ntfs_attr_get_search_ctx(ni, m);
2987         if (unlikely(!ctx)) {
2988                 err = -ENOMEM;
2989                 goto unm_err_out;
2990         }
2991         err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0,
2992                         CASE_SENSITIVE, 0, NULL, 0, ctx);
2993         if (unlikely(err)) {
2994                 ntfs_attr_put_search_ctx(ctx);
2995                 goto unm_err_out;
2996         }
2997         si = (STANDARD_INFORMATION*)((u8*)ctx->attr +
2998                         le16_to_cpu(ctx->attr->data.resident.value_offset));
2999         /* Update the access times if they have changed. */
3000         nt = utc2ntfs(vi->i_mtime);
3001         if (si->last_data_change_time != nt) {
3002                 ntfs_debug("Updating mtime for inode 0x%lx: old = 0x%llx, "
3003                                 "new = 0x%llx", vi->i_ino, (long long)
3004                                 sle64_to_cpu(si->last_data_change_time),
3005                                 (long long)sle64_to_cpu(nt));
3006                 si->last_data_change_time = nt;
3007                 modified = true;
3008         }
3009         nt = utc2ntfs(vi->i_ctime);
3010         if (si->last_mft_change_time != nt) {
3011                 ntfs_debug("Updating ctime for inode 0x%lx: old = 0x%llx, "
3012                                 "new = 0x%llx", vi->i_ino, (long long)
3013                                 sle64_to_cpu(si->last_mft_change_time),
3014                                 (long long)sle64_to_cpu(nt));
3015                 si->last_mft_change_time = nt;
3016                 modified = true;
3017         }
3018         nt = utc2ntfs(vi->i_atime);
3019         if (si->last_access_time != nt) {
3020                 ntfs_debug("Updating atime for inode 0x%lx: old = 0x%llx, "
3021                                 "new = 0x%llx", vi->i_ino,
3022                                 (long long)sle64_to_cpu(si->last_access_time),
3023                                 (long long)sle64_to_cpu(nt));
3024                 si->last_access_time = nt;
3025                 modified = true;
3026         }
3027         /*
3028          * If we just modified the standard information attribute we need to
3029          * mark the mft record it is in dirty.  We do this manually so that
3030          * mark_inode_dirty() is not called which would redirty the inode and
3031          * hence result in an infinite loop of trying to write the inode.
3032          * There is no need to mark the base inode nor the base mft record
3033          * dirty, since we are going to write this mft record below in any case
3034          * and the base mft record may actually not have been modified so it
3035          * might not need to be written out.
3036          * NOTE: It is not a problem when the inode for $MFT itself is being
3037          * written out as mark_ntfs_record_dirty() will only set I_DIRTY_PAGES
3038          * on the $MFT inode and hence ntfs_write_inode() will not be
3039          * re-invoked because of it which in turn is ok since the dirtied mft
3040          * record will be cleaned and written out to disk below, i.e. before
3041          * this function returns.
3042          */
3043         if (modified) {
3044                 flush_dcache_mft_record_page(ctx->ntfs_ino);
3045                 if (!NInoTestSetDirty(ctx->ntfs_ino))
3046                         mark_ntfs_record_dirty(ctx->ntfs_ino->page,
3047                                         ctx->ntfs_ino->page_ofs);
3048         }
3049         ntfs_attr_put_search_ctx(ctx);
3050         /* Now the access times are updated, write the base mft record. */
3051         if (NInoDirty(ni))
3052                 err = write_mft_record(ni, m, sync);
3053         /* Write all attached extent mft records. */
3054         mutex_lock(&ni->extent_lock);
3055         if (ni->nr_extents > 0) {
3056                 ntfs_inode **extent_nis = ni->ext.extent_ntfs_inos;
3057                 int i;
3058 
3059                 ntfs_debug("Writing %i extent inodes.", ni->nr_extents);
3060                 for (i = 0; i < ni->nr_extents; i++) {
3061                         ntfs_inode *tni = extent_nis[i];
3062 
3063                         if (NInoDirty(tni)) {
3064                                 MFT_RECORD *tm = map_mft_record(tni);
3065                                 int ret;
3066 
3067                                 if (IS_ERR(tm)) {
3068                                         if (!err || err == -ENOMEM)
3069                                                 err = PTR_ERR(tm);
3070                                         continue;
3071                                 }
3072                                 ret = write_mft_record(tni, tm, sync);
3073                                 unmap_mft_record(tni);
3074                                 if (unlikely(ret)) {
3075                                         if (!err || err == -ENOMEM)
3076                                                 err = ret;
3077                                 }
3078                         }
3079                 }
3080         }
3081         mutex_unlock(&ni->extent_lock);
3082         unmap_mft_record(ni);
3083         if (unlikely(err))
3084                 goto err_out;
3085         ntfs_debug("Done.");
3086         return 0;
3087 unm_err_out:
3088         unmap_mft_record(ni);
3089 err_out:
3090         if (err == -ENOMEM) {
3091                 ntfs_warning(vi->i_sb, "Not enough memory to write inode.  "
3092                                 "Marking the inode dirty again, so the VFS "
3093                                 "retries later.");
3094                 mark_inode_dirty(vi);
3095         } else {
3096                 ntfs_error(vi->i_sb, "Failed (error %i):  Run chkdsk.", -err);
3097                 NVolSetErrors(ni->vol);
3098         }
3099         return err;
3100 }
3101 
3102 #endif /* NTFS_RW */
3103 

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