blob: 86bef156cf0a15b277d879021b24138a333d4eeb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
2 * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
3 *
Anton Altaparmakov83311912007-01-18 09:42:48 +00004 * Copyright (c) 2001-2007 Anton Altaparmakov
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/buffer_head.h>
Anton Altaparmakova778f212006-03-23 16:18:23 +000023#include <linux/fs.h>
24#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/mount.h>
Anton Altaparmakova0646a12006-03-23 15:53:03 +000026#include <linux/mutex.h>
Anton Altaparmakova778f212006-03-23 16:18:23 +000027#include <linux/pagemap.h>
28#include <linux/quotaops.h>
29#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#include "aops.h"
Anton Altaparmakova0646a12006-03-23 15:53:03 +000032#include "attrib.h"
Anton Altaparmakova778f212006-03-23 16:18:23 +000033#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "dir.h"
35#include "debug.h"
36#include "inode.h"
Anton Altaparmakovdd072332005-10-04 15:39:02 +010037#include "lcnalloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include "malloc.h"
39#include "mft.h"
40#include "time.h"
41#include "ntfs.h"
42
43/**
44 * ntfs_test_inode - compare two (possibly fake) inodes for equality
45 * @vi: vfs inode which to test
46 * @na: ntfs attribute which is being tested with
47 *
48 * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
49 * inode @vi for equality with the ntfs attribute @na.
50 *
51 * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
52 * @na->name and @na->name_len are then ignored.
53 *
54 * Return 1 if the attributes match and 0 if not.
55 *
56 * NOTE: This function runs with the inode_lock spin lock held so it is not
57 * allowed to sleep.
58 */
59int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
60{
61 ntfs_inode *ni;
62
63 if (vi->i_ino != na->mft_no)
64 return 0;
65 ni = NTFS_I(vi);
66 /* If !NInoAttr(ni), @vi is a normal file or directory inode. */
67 if (likely(!NInoAttr(ni))) {
68 /* If not looking for a normal inode this is a mismatch. */
69 if (unlikely(na->type != AT_UNUSED))
70 return 0;
71 } else {
72 /* A fake inode describing an attribute. */
73 if (ni->type != na->type)
74 return 0;
75 if (ni->name_len != na->name_len)
76 return 0;
77 if (na->name_len && memcmp(ni->name, na->name,
78 na->name_len * sizeof(ntfschar)))
79 return 0;
80 }
81 /* Match! */
82 return 1;
83}
84
85/**
86 * ntfs_init_locked_inode - initialize an inode
87 * @vi: vfs inode to initialize
88 * @na: ntfs attribute which to initialize @vi to
89 *
90 * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
91 * order to enable ntfs_test_inode() to do its work.
92 *
93 * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
94 * In that case, @na->name and @na->name_len should be set to NULL and 0,
95 * respectively. Although that is not strictly necessary as
Anton Altaparmakov83311912007-01-18 09:42:48 +000096 * ntfs_read_locked_inode() will fill them in later.
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 *
98 * Return 0 on success and -errno on error.
99 *
100 * NOTE: This function runs with the inode_lock spin lock held so it is not
101 * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
102 */
103static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
104{
105 ntfs_inode *ni = NTFS_I(vi);
106
107 vi->i_ino = na->mft_no;
108
109 ni->type = na->type;
110 if (na->type == AT_INDEX_ALLOCATION)
111 NInoSetMstProtected(ni);
112
113 ni->name = na->name;
114 ni->name_len = na->name_len;
115
116 /* If initializing a normal inode, we are done. */
117 if (likely(na->type == AT_UNUSED)) {
118 BUG_ON(na->name);
119 BUG_ON(na->name_len);
120 return 0;
121 }
122
123 /* It is a fake inode. */
124 NInoSetAttr(ni);
125
126 /*
127 * We have I30 global constant as an optimization as it is the name
128 * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC
129 * allocation but that is ok. And most attributes are unnamed anyway,
130 * thus the fraction of named attributes with name != I30 is actually
131 * absolutely tiny.
132 */
133 if (na->name_len && na->name != I30) {
134 unsigned int i;
135
136 BUG_ON(!na->name);
137 i = na->name_len * sizeof(ntfschar);
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700138 ni->name = kmalloc(i + sizeof(ntfschar), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 if (!ni->name)
140 return -ENOMEM;
141 memcpy(ni->name, na->name, i);
Andrew Morton1fc799e2007-05-31 00:40:49 -0700142 ni->name[na->name_len] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 }
144 return 0;
145}
146
147typedef int (*set_t)(struct inode *, void *);
148static int ntfs_read_locked_inode(struct inode *vi);
149static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
150static int ntfs_read_locked_index_inode(struct inode *base_vi,
151 struct inode *vi);
152
153/**
154 * ntfs_iget - obtain a struct inode corresponding to a specific normal inode
155 * @sb: super block of mounted volume
156 * @mft_no: mft record number / inode number to obtain
157 *
158 * Obtain the struct inode corresponding to a specific normal inode (i.e. a
159 * file or directory).
160 *
161 * If the inode is in the cache, it is just returned with an increased
162 * reference count. Otherwise, a new struct inode is allocated and initialized,
163 * and finally ntfs_read_locked_inode() is called to read in the inode and
164 * fill in the remainder of the inode structure.
165 *
166 * Return the struct inode on success. Check the return value with IS_ERR() and
167 * if true, the function failed and the error code is obtained from PTR_ERR().
168 */
169struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
170{
171 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000173 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 na.mft_no = mft_no;
176 na.type = AT_UNUSED;
177 na.name = NULL;
178 na.name_len = 0;
179
180 vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
181 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000182 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return ERR_PTR(-ENOMEM);
184
185 err = 0;
186
187 /* If this is a freshly allocated inode, need to read it now. */
188 if (vi->i_state & I_NEW) {
189 err = ntfs_read_locked_inode(vi);
190 unlock_new_inode(vi);
191 }
192 /*
193 * There is no point in keeping bad inodes around if the failure was
194 * due to ENOMEM. We want to be able to retry again later.
195 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000196 if (unlikely(err == -ENOMEM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 iput(vi);
198 vi = ERR_PTR(err);
199 }
200 return vi;
201}
202
203/**
204 * ntfs_attr_iget - obtain a struct inode corresponding to an attribute
205 * @base_vi: vfs base inode containing the attribute
206 * @type: attribute type
207 * @name: Unicode name of the attribute (NULL if unnamed)
208 * @name_len: length of @name in Unicode characters (0 if unnamed)
209 *
210 * Obtain the (fake) struct inode corresponding to the attribute specified by
211 * @type, @name, and @name_len, which is present in the base mft record
212 * specified by the vfs inode @base_vi.
213 *
214 * If the attribute inode is in the cache, it is just returned with an
215 * increased reference count. Otherwise, a new struct inode is allocated and
216 * initialized, and finally ntfs_read_locked_attr_inode() is called to read the
217 * attribute and fill in the inode structure.
218 *
219 * Note, for index allocation attributes, you need to use ntfs_index_iget()
220 * instead of ntfs_attr_iget() as working with indices is a lot more complex.
221 *
222 * Return the struct inode of the attribute inode on success. Check the return
223 * value with IS_ERR() and if true, the function failed and the error code is
224 * obtained from PTR_ERR().
225 */
226struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
227 ntfschar *name, u32 name_len)
228{
229 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000231 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 /* Make sure no one calls ntfs_attr_iget() for indices. */
234 BUG_ON(type == AT_INDEX_ALLOCATION);
235
236 na.mft_no = base_vi->i_ino;
237 na.type = type;
238 na.name = name;
239 na.name_len = name_len;
240
241 vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
242 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000243 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return ERR_PTR(-ENOMEM);
245
246 err = 0;
247
248 /* If this is a freshly allocated inode, need to read it now. */
249 if (vi->i_state & I_NEW) {
250 err = ntfs_read_locked_attr_inode(base_vi, vi);
251 unlock_new_inode(vi);
252 }
253 /*
254 * There is no point in keeping bad attribute inodes around. This also
255 * simplifies things in that we never need to check for bad attribute
256 * inodes elsewhere.
257 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000258 if (unlikely(err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 iput(vi);
260 vi = ERR_PTR(err);
261 }
262 return vi;
263}
264
265/**
266 * ntfs_index_iget - obtain a struct inode corresponding to an index
267 * @base_vi: vfs base inode containing the index related attributes
268 * @name: Unicode name of the index
269 * @name_len: length of @name in Unicode characters
270 *
271 * Obtain the (fake) struct inode corresponding to the index specified by @name
272 * and @name_len, which is present in the base mft record specified by the vfs
273 * inode @base_vi.
274 *
275 * If the index inode is in the cache, it is just returned with an increased
276 * reference count. Otherwise, a new struct inode is allocated and
277 * initialized, and finally ntfs_read_locked_index_inode() is called to read
278 * the index related attributes and fill in the inode structure.
279 *
280 * Return the struct inode of the index inode on success. Check the return
281 * value with IS_ERR() and if true, the function failed and the error code is
282 * obtained from PTR_ERR().
283 */
284struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
285 u32 name_len)
286{
287 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000289 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 na.mft_no = base_vi->i_ino;
292 na.type = AT_INDEX_ALLOCATION;
293 na.name = name;
294 na.name_len = name_len;
295
296 vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
297 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000298 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return ERR_PTR(-ENOMEM);
300
301 err = 0;
302
303 /* If this is a freshly allocated inode, need to read it now. */
304 if (vi->i_state & I_NEW) {
305 err = ntfs_read_locked_index_inode(base_vi, vi);
306 unlock_new_inode(vi);
307 }
308 /*
309 * There is no point in keeping bad index inodes around. This also
310 * simplifies things in that we never need to check for bad index
311 * inodes elsewhere.
312 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000313 if (unlikely(err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 iput(vi);
315 vi = ERR_PTR(err);
316 }
317 return vi;
318}
319
320struct inode *ntfs_alloc_big_inode(struct super_block *sb)
321{
322 ntfs_inode *ni;
323
324 ntfs_debug("Entering.");
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800325 ni = kmem_cache_alloc(ntfs_big_inode_cache, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (likely(ni != NULL)) {
327 ni->state = 0;
328 return VFS_I(ni);
329 }
330 ntfs_error(sb, "Allocation of NTFS big inode structure failed.");
331 return NULL;
332}
333
334void ntfs_destroy_big_inode(struct inode *inode)
335{
336 ntfs_inode *ni = NTFS_I(inode);
337
338 ntfs_debug("Entering.");
339 BUG_ON(ni->page);
340 if (!atomic_dec_and_test(&ni->count))
341 BUG();
342 kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
343}
344
345static inline ntfs_inode *ntfs_alloc_extent_inode(void)
346{
347 ntfs_inode *ni;
348
349 ntfs_debug("Entering.");
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800350 ni = kmem_cache_alloc(ntfs_inode_cache, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (likely(ni != NULL)) {
352 ni->state = 0;
353 return ni;
354 }
355 ntfs_error(NULL, "Allocation of NTFS inode structure failed.");
356 return NULL;
357}
358
359static void ntfs_destroy_extent_inode(ntfs_inode *ni)
360{
361 ntfs_debug("Entering.");
362 BUG_ON(ni->page);
363 if (!atomic_dec_and_test(&ni->count))
364 BUG();
365 kmem_cache_free(ntfs_inode_cache, ni);
366}
367
Ingo Molnar59345372006-07-03 00:25:18 -0700368/*
369 * The attribute runlist lock has separate locking rules from the
370 * normal runlist lock, so split the two lock-classes:
371 */
372static struct lock_class_key attr_list_rl_lock_class;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374/**
375 * __ntfs_init_inode - initialize ntfs specific part of an inode
376 * @sb: super block of mounted volume
377 * @ni: freshly allocated ntfs inode which to initialize
378 *
379 * Initialize an ntfs inode to defaults.
380 *
381 * NOTE: ni->mft_no, ni->state, ni->type, ni->name, and ni->name_len are left
382 * untouched. Make sure to initialize them elsewhere.
383 *
384 * Return zero on success and -ENOMEM on error.
385 */
386void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
387{
388 ntfs_debug("Entering.");
Anton Altaparmakov36763672004-11-18 13:46:45 +0000389 rwlock_init(&ni->size_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 ni->initialized_size = ni->allocated_size = 0;
391 ni->seq_no = 0;
392 atomic_set(&ni->count, 1);
393 ni->vol = NTFS_SB(sb);
394 ntfs_init_runlist(&ni->runlist);
Ingo Molnar4e5e5292006-03-23 16:57:48 +0000395 mutex_init(&ni->mrec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 ni->page = NULL;
397 ni->page_ofs = 0;
398 ni->attr_list_size = 0;
399 ni->attr_list = NULL;
400 ntfs_init_runlist(&ni->attr_list_rl);
Ingo Molnar59345372006-07-03 00:25:18 -0700401 lockdep_set_class(&ni->attr_list_rl.lock,
402 &attr_list_rl_lock_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 ni->itype.index.block_size = 0;
404 ni->itype.index.vcn_size = 0;
405 ni->itype.index.collation_rule = 0;
406 ni->itype.index.block_size_bits = 0;
407 ni->itype.index.vcn_size_bits = 0;
Ingo Molnar4e5e5292006-03-23 16:57:48 +0000408 mutex_init(&ni->extent_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 ni->nr_extents = 0;
410 ni->ext.base_ntfs_ino = NULL;
411}
412
Ingo Molnar59345372006-07-03 00:25:18 -0700413/*
414 * Extent inodes get MFT-mapped in a nested way, while the base inode
415 * is still mapped. Teach this nesting to the lock validator by creating
416 * a separate class for nested inode's mrec_lock's:
417 */
418static struct lock_class_key extent_inode_mrec_lock_key;
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420inline ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
421 unsigned long mft_no)
422{
423 ntfs_inode *ni = ntfs_alloc_extent_inode();
424
425 ntfs_debug("Entering.");
426 if (likely(ni != NULL)) {
427 __ntfs_init_inode(sb, ni);
Ingo Molnar59345372006-07-03 00:25:18 -0700428 lockdep_set_class(&ni->mrec_lock, &extent_inode_mrec_lock_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 ni->mft_no = mft_no;
430 ni->type = AT_UNUSED;
431 ni->name = NULL;
432 ni->name_len = 0;
433 }
434 return ni;
435}
436
437/**
438 * ntfs_is_extended_system_file - check if a file is in the $Extend directory
439 * @ctx: initialized attribute search context
440 *
441 * Search all file name attributes in the inode described by the attribute
442 * search context @ctx and check if any of the names are in the $Extend system
443 * directory.
444 *
445 * Return values:
446 * 1: file is in $Extend directory
447 * 0: file is not in $Extend directory
448 * -errno: failed to determine if the file is in the $Extend directory
449 */
450static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx)
451{
452 int nr_links, err;
453
454 /* Restart search. */
455 ntfs_attr_reinit_search_ctx(ctx);
456
457 /* Get number of hard links. */
458 nr_links = le16_to_cpu(ctx->mrec->link_count);
459
460 /* Loop through all hard links. */
461 while (!(err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0,
462 ctx))) {
463 FILE_NAME_ATTR *file_name_attr;
464 ATTR_RECORD *attr = ctx->attr;
465 u8 *p, *p2;
466
467 nr_links--;
468 /*
469 * Maximum sanity checking as we are called on an inode that
470 * we suspect might be corrupt.
471 */
472 p = (u8*)attr + le32_to_cpu(attr->length);
473 if (p < (u8*)ctx->mrec || (u8*)p > (u8*)ctx->mrec +
474 le32_to_cpu(ctx->mrec->bytes_in_use)) {
475err_corrupt_attr:
476 ntfs_error(ctx->ntfs_ino->vol->sb, "Corrupt file name "
477 "attribute. You should run chkdsk.");
478 return -EIO;
479 }
480 if (attr->non_resident) {
481 ntfs_error(ctx->ntfs_ino->vol->sb, "Non-resident file "
482 "name. You should run chkdsk.");
483 return -EIO;
484 }
485 if (attr->flags) {
486 ntfs_error(ctx->ntfs_ino->vol->sb, "File name with "
487 "invalid flags. You should run "
488 "chkdsk.");
489 return -EIO;
490 }
491 if (!(attr->data.resident.flags & RESIDENT_ATTR_IS_INDEXED)) {
492 ntfs_error(ctx->ntfs_ino->vol->sb, "Unindexed file "
493 "name. You should run chkdsk.");
494 return -EIO;
495 }
496 file_name_attr = (FILE_NAME_ATTR*)((u8*)attr +
497 le16_to_cpu(attr->data.resident.value_offset));
498 p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length);
499 if (p2 < (u8*)attr || p2 > p)
500 goto err_corrupt_attr;
501 /* This attribute is ok, but is it in the $Extend directory? */
502 if (MREF_LE(file_name_attr->parent_directory) == FILE_Extend)
503 return 1; /* YES, it's an extended system file. */
504 }
505 if (unlikely(err != -ENOENT))
506 return err;
507 if (unlikely(nr_links)) {
508 ntfs_error(ctx->ntfs_ino->vol->sb, "Inode hard link count "
509 "doesn't match number of name attributes. You "
510 "should run chkdsk.");
511 return -EIO;
512 }
513 return 0; /* NO, it is not an extended system file. */
514}
515
516/**
517 * ntfs_read_locked_inode - read an inode from its device
518 * @vi: inode to read
519 *
520 * ntfs_read_locked_inode() is called from ntfs_iget() to read the inode
521 * described by @vi into memory from the device.
522 *
523 * The only fields in @vi that we need to/can look at when the function is
524 * called are i_sb, pointing to the mounted device's super block, and i_ino,
525 * the number of the inode to load.
526 *
527 * ntfs_read_locked_inode() maps, pins and locks the mft record number i_ino
528 * for reading and sets up the necessary @vi fields as well as initializing
529 * the ntfs inode.
530 *
531 * Q: What locks are held when the function is called?
532 * A: i_state has I_LOCK set, hence the inode is locked, also
533 * i_count is set to 1, so it is not going to go away
534 * i_flags is set to 0 and we have no business touching it. Only an ioctl()
535 * is allowed to write to them. We should of course be honouring them but
536 * we need to do that using the IS_* macros defined in include/linux/fs.h.
537 * In any case ntfs_read_locked_inode() has nothing to do with i_flags.
538 *
539 * Return 0 on success and -errno on error. In the error case, the inode will
540 * have had make_bad_inode() executed on it.
541 */
542static int ntfs_read_locked_inode(struct inode *vi)
543{
544 ntfs_volume *vol = NTFS_SB(vi->i_sb);
545 ntfs_inode *ni;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000546 struct inode *bvi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000548 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 STANDARD_INFORMATION *si;
550 ntfs_attr_search_ctx *ctx;
551 int err = 0;
552
553 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
554
555 /* Setup the generic vfs inode parts now. */
556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 /*
558 * This is for checking whether an inode has changed w.r.t. a file so
559 * that the file can be updated if necessary (compare with f_version).
560 */
561 vi->i_version = 1;
562
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 vi->i_nlink = 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, noone 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 vi->i_nlink = 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 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000655 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 /* Get the standard information attribute value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000657 si = (STANDARD_INFORMATION*)((u8*)a +
658 le16_to_cpu(a->data.resident.value_offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
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);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000697 a = ctx->attr;
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000698 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 ntfs_error(vi->i_sb, "Attribute list attribute is "
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000700 "compressed.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 goto unm_err_out;
702 }
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000703 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 /* Now allocate memory for the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000721 ni->attr_list_size = (u32)ntfs_attr_size(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 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 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000729 if (a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 NInoSetAttrListNonResident(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000731 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 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,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000741 a, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 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,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000752 sle64_to_cpu(a->data.non_resident.
753 initialized_size)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 ntfs_error(vi->i_sb, "Failed to load "
755 "attribute list attribute.");
756 goto unm_err_out;
757 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000758 } 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) >
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 (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. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000768 memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
769 a->data.resident.value_offset),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000771 a->data.resident.value_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773 }
774skip_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)) {
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000780 loff_t bvi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 ntfs_inode *bni;
782 INDEX_ROOT *ir;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000783 u8 *ir_end, *index_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
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, "$INDEX_ROOT attribute "
795 "is missing.");
796 }
797 goto unm_err_out;
798 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000799 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 /* Set up the state. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000801 if (unlikely(a->non_resident)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
803 "resident.");
804 goto unm_err_out;
805 }
806 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000807 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
808 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
810 "placed after the attribute value.");
811 goto unm_err_out;
812 }
813 /*
814 * Compressed/encrypted index root just means that the newly
815 * created files in that directory should be created compressed/
816 * encrypted. However index root cannot be both compressed and
817 * encrypted.
818 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000819 if (a->flags & ATTR_COMPRESSION_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 NInoSetCompressed(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000821 if (a->flags & ATTR_IS_ENCRYPTED) {
822 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 ntfs_error(vi->i_sb, "Found encrypted and "
824 "compressed attribute.");
825 goto unm_err_out;
826 }
827 NInoSetEncrypted(ni);
828 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000829 if (a->flags & ATTR_IS_SPARSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 NInoSetSparse(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000831 ir = (INDEX_ROOT*)((u8*)a +
832 le16_to_cpu(a->data.resident.value_offset));
833 ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
834 if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
836 "corrupt.");
837 goto unm_err_out;
838 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000839 index_end = (u8*)&ir->index +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 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_CACHE_SIZE) {
865 ntfs_error(vi->i_sb, "Index block size (%u) > "
866 "PAGE_CACHE_SIZE (%ld) is not "
867 "supported. Sorry.",
868 ni->itype.index.block_size,
869 PAGE_CACHE_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 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000926 a = ctx->attr;
927 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
929 "is resident.");
930 goto unm_err_out;
931 }
932 /*
933 * Ensure the attribute name is placed before the mapping pairs
934 * array.
935 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000936 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
937 le16_to_cpu(
938 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
940 "is placed after the mapping pairs "
941 "array.");
942 goto unm_err_out;
943 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000944 if (a->flags & ATTR_IS_ENCRYPTED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
946 "is encrypted.");
947 goto unm_err_out;
948 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000949 if (a->flags & ATTR_IS_SPARSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
951 "is sparse.");
952 goto unm_err_out;
953 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000954 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
956 "is compressed.");
957 goto unm_err_out;
958 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000959 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 ntfs_error(vi->i_sb, "First extent of "
961 "$INDEX_ALLOCATION attribute has non "
962 "zero lowest_vcn.");
963 goto unm_err_out;
964 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000965 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000967 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000969 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 /*
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 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.");
Anton Altaparmakov83311912007-01-18 09:42:48 +0000990 goto iput_unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 }
992 /* Consistency check bitmap size vs. index allocation size. */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000993 bvi_size = i_size_read(bvi);
994 if ((bvi_size << 3) < (vi->i_size >>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 ni->itype.index.block_size_bits)) {
996 ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
997 "for index allocation (0x%llx).",
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000998 bvi_size << 3, vi->i_size);
Anton Altaparmakov83311912007-01-18 09:42:48 +0000999 goto iput_unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 }
Anton Altaparmakov83311912007-01-18 09:42:48 +00001001 /* No longer need the bitmap attribute inode. */
1002 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003skip_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 } else {
1008 /* It is a file. */
1009 ntfs_attr_reinit_search_ctx(ctx);
1010
1011 /* Setup the data attribute, even if not present. */
1012 ni->type = AT_DATA;
1013 ni->name = NULL;
1014 ni->name_len = 0;
1015
1016 /* Find first extent of the unnamed data attribute. */
1017 err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx);
1018 if (unlikely(err)) {
1019 vi->i_size = ni->initialized_size =
1020 ni->allocated_size = 0;
1021 if (err != -ENOENT) {
1022 ntfs_error(vi->i_sb, "Failed to lookup $DATA "
1023 "attribute.");
1024 goto unm_err_out;
1025 }
1026 /*
1027 * FILE_Secure does not have an unnamed $DATA
1028 * attribute, so we special case it here.
1029 */
1030 if (vi->i_ino == FILE_Secure)
1031 goto no_data_attr_special_case;
1032 /*
1033 * Most if not all the system files in the $Extend
1034 * system directory do not have unnamed data
1035 * attributes so we need to check if the parent
1036 * directory of the file is FILE_Extend and if it is
1037 * ignore this error. To do this we need to get the
1038 * name of this inode from the mft record as the name
1039 * contains the back reference to the parent directory.
1040 */
1041 if (ntfs_is_extended_system_file(ctx) > 0)
1042 goto no_data_attr_special_case;
1043 // FIXME: File is corrupt! Hot-fix with empty data
1044 // attribute if recovery option is set.
1045 ntfs_error(vi->i_sb, "$DATA attribute is missing.");
1046 goto unm_err_out;
1047 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001048 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 /* Setup the state. */
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001050 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1051 if (a->flags & ATTR_COMPRESSION_MASK) {
1052 NInoSetCompressed(ni);
1053 if (vol->cluster_size > 4096) {
1054 ntfs_error(vi->i_sb, "Found "
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001055 "compressed data but "
1056 "compression is "
1057 "disabled due to "
1058 "cluster size (%i) > "
1059 "4kiB.",
1060 vol->cluster_size);
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001061 goto unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001063 if ((a->flags & ATTR_COMPRESSION_MASK)
1064 != ATTR_IS_COMPRESSED) {
1065 ntfs_error(vi->i_sb, "Found unknown "
1066 "compression method "
1067 "or corrupt file.");
1068 goto unm_err_out;
1069 }
1070 }
1071 if (a->flags & ATTR_IS_SPARSE)
1072 NInoSetSparse(ni);
1073 }
1074 if (a->flags & ATTR_IS_ENCRYPTED) {
1075 if (NInoCompressed(ni)) {
1076 ntfs_error(vi->i_sb, "Found encrypted and "
1077 "compressed data.");
1078 goto unm_err_out;
1079 }
1080 NInoSetEncrypted(ni);
1081 }
1082 if (a->non_resident) {
1083 NInoSetNonResident(ni);
1084 if (NInoCompressed(ni) || NInoSparse(ni)) {
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001085 if (NInoCompressed(ni) && a->data.non_resident.
1086 compression_unit != 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 ntfs_error(vi->i_sb, "Found "
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001088 "non-standard "
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001089 "compression unit (%u "
1090 "instead of 4). "
1091 "Cannot handle this.",
1092 a->data.non_resident.
1093 compression_unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 err = -EOPNOTSUPP;
1095 goto unm_err_out;
1096 }
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001097 if (a->data.non_resident.compression_unit) {
1098 ni->itype.compressed.block_size = 1U <<
1099 (a->data.non_resident.
1100 compression_unit +
1101 vol->cluster_size_bits);
1102 ni->itype.compressed.block_size_bits =
1103 ffs(ni->itype.
1104 compressed.
1105 block_size) - 1;
1106 ni->itype.compressed.block_clusters =
1107 1U << a->data.
1108 non_resident.
1109 compression_unit;
1110 } else {
1111 ni->itype.compressed.block_size = 0;
1112 ni->itype.compressed.block_size_bits =
1113 0;
1114 ni->itype.compressed.block_clusters =
1115 0;
1116 }
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001117 ni->itype.compressed.size = sle64_to_cpu(
1118 a->data.non_resident.
1119 compressed_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001121 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 ntfs_error(vi->i_sb, "First extent of $DATA "
1123 "attribute has non zero "
1124 "lowest_vcn.");
1125 goto unm_err_out;
1126 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 vi->i_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001128 a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001130 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001132 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 } else { /* Resident attribute. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001134 vi->i_size = ni->initialized_size = le32_to_cpu(
1135 a->data.resident.value_length);
1136 ni->allocated_size = le32_to_cpu(a->length) -
1137 le16_to_cpu(
1138 a->data.resident.value_offset);
1139 if (vi->i_size > ni->allocated_size) {
1140 ntfs_error(vi->i_sb, "Resident data attribute "
1141 "is corrupt (size exceeds "
1142 "allocation).");
1143 goto unm_err_out;
1144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 }
1146no_data_attr_special_case:
1147 /* We are done with the mft record, so we release it. */
1148 ntfs_attr_put_search_ctx(ctx);
1149 unmap_mft_record(ni);
1150 m = NULL;
1151 ctx = NULL;
1152 /* Setup the operations for this inode. */
1153 vi->i_op = &ntfs_file_inode_ops;
1154 vi->i_fop = &ntfs_file_ops;
1155 }
1156 if (NInoMstProtected(ni))
1157 vi->i_mapping->a_ops = &ntfs_mst_aops;
1158 else
1159 vi->i_mapping->a_ops = &ntfs_aops;
1160 /*
1161 * The number of 512-byte blocks used on disk (for stat). This is in so
1162 * far inaccurate as it doesn't account for any named streams or other
1163 * special non-resident attributes, but that is how Windows works, too,
1164 * so we are at least consistent with Windows, if not entirely
1165 * consistent with the Linux Way. Doing it the Linux Way would cause a
1166 * significant slowdown as it would involve iterating over all
1167 * attributes in the mft record and adding the allocated/compressed
1168 * sizes of all non-resident attributes present to give us the Linux
1169 * correct size that should go into i_blocks (after division by 512).
1170 */
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001171 if (S_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 vi->i_blocks = ni->itype.compressed.size >> 9;
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001173 else
1174 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 ntfs_debug("Done.");
1176 return 0;
Anton Altaparmakov83311912007-01-18 09:42:48 +00001177iput_unm_err_out:
1178 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179unm_err_out:
1180 if (!err)
1181 err = -EIO;
1182 if (ctx)
1183 ntfs_attr_put_search_ctx(ctx);
1184 if (m)
1185 unmap_mft_record(ni);
1186err_out:
1187 ntfs_error(vol->sb, "Failed with error code %i. Marking corrupt "
1188 "inode 0x%lx as bad. Run chkdsk.", err, vi->i_ino);
1189 make_bad_inode(vi);
1190 if (err != -EOPNOTSUPP && err != -ENOMEM)
1191 NVolSetErrors(vol);
1192 return err;
1193}
1194
1195/**
1196 * ntfs_read_locked_attr_inode - read an attribute inode from its base inode
1197 * @base_vi: base inode
1198 * @vi: attribute inode to read
1199 *
1200 * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the
1201 * attribute inode described by @vi into memory from the base mft record
1202 * described by @base_ni.
1203 *
1204 * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for
1205 * reading and looks up the attribute described by @vi before setting up the
1206 * necessary fields in @vi as well as initializing the ntfs inode.
1207 *
1208 * Q: What locks are held when the function is called?
1209 * A: i_state has I_LOCK set, hence the inode is locked, also
1210 * i_count is set to 1, so it is not going to go away
1211 *
1212 * Return 0 on success and -errno on error. In the error case, the inode will
1213 * have had make_bad_inode() executed on it.
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001214 *
1215 * Note this cannot be called for AT_INDEX_ALLOCATION.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 */
1217static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
1218{
1219 ntfs_volume *vol = NTFS_SB(vi->i_sb);
1220 ntfs_inode *ni, *base_ni;
1221 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001222 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 ntfs_attr_search_ctx *ctx;
1224 int err = 0;
1225
1226 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1227
1228 ntfs_init_big_inode(vi);
1229
1230 ni = NTFS_I(vi);
1231 base_ni = NTFS_I(base_vi);
1232
1233 /* Just mirror the values from the base inode. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 vi->i_version = base_vi->i_version;
1235 vi->i_uid = base_vi->i_uid;
1236 vi->i_gid = base_vi->i_gid;
1237 vi->i_nlink = base_vi->i_nlink;
1238 vi->i_mtime = base_vi->i_mtime;
1239 vi->i_ctime = base_vi->i_ctime;
1240 vi->i_atime = base_vi->i_atime;
1241 vi->i_generation = ni->seq_no = base_ni->seq_no;
1242
1243 /* Set inode type to zero but preserve permissions. */
1244 vi->i_mode = base_vi->i_mode & ~S_IFMT;
1245
1246 m = map_mft_record(base_ni);
1247 if (IS_ERR(m)) {
1248 err = PTR_ERR(m);
1249 goto err_out;
1250 }
1251 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1252 if (!ctx) {
1253 err = -ENOMEM;
1254 goto unm_err_out;
1255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 /* Find the attribute. */
1257 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1258 CASE_SENSITIVE, 0, NULL, 0, ctx);
1259 if (unlikely(err))
1260 goto unm_err_out;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001261 a = ctx->attr;
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001262 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1263 if (a->flags & ATTR_COMPRESSION_MASK) {
1264 NInoSetCompressed(ni);
1265 if ((ni->type != AT_DATA) || (ni->type == AT_DATA &&
1266 ni->name_len)) {
1267 ntfs_error(vi->i_sb, "Found compressed "
1268 "non-data or named data "
1269 "attribute. Please report "
1270 "you saw this message to "
1271 "linux-ntfs-dev@lists."
1272 "sourceforge.net");
1273 goto unm_err_out;
1274 }
1275 if (vol->cluster_size > 4096) {
1276 ntfs_error(vi->i_sb, "Found compressed "
1277 "attribute but compression is "
1278 "disabled due to cluster size "
1279 "(%i) > 4kiB.",
1280 vol->cluster_size);
1281 goto unm_err_out;
1282 }
1283 if ((a->flags & ATTR_COMPRESSION_MASK) !=
1284 ATTR_IS_COMPRESSED) {
1285 ntfs_error(vi->i_sb, "Found unknown "
1286 "compression method.");
1287 goto unm_err_out;
1288 }
1289 }
1290 /*
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001291 * The compressed/sparse flag set in an index root just means
1292 * to compress all files.
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001293 */
1294 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1295 ntfs_error(vi->i_sb, "Found mst protected attribute "
1296 "but the attribute is %s. Please "
1297 "report you saw this message to "
1298 "linux-ntfs-dev@lists.sourceforge.net",
1299 NInoCompressed(ni) ? "compressed" :
1300 "sparse");
1301 goto unm_err_out;
1302 }
1303 if (a->flags & ATTR_IS_SPARSE)
1304 NInoSetSparse(ni);
1305 }
1306 if (a->flags & ATTR_IS_ENCRYPTED) {
1307 if (NInoCompressed(ni)) {
1308 ntfs_error(vi->i_sb, "Found encrypted and compressed "
1309 "data.");
1310 goto unm_err_out;
1311 }
1312 /*
1313 * The encryption flag set in an index root just means to
1314 * encrypt all files.
1315 */
1316 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1317 ntfs_error(vi->i_sb, "Found mst protected attribute "
1318 "but the attribute is encrypted. "
1319 "Please report you saw this message "
1320 "to linux-ntfs-dev@lists.sourceforge."
1321 "net");
1322 goto unm_err_out;
1323 }
1324 if (ni->type != AT_DATA) {
1325 ntfs_error(vi->i_sb, "Found encrypted non-data "
1326 "attribute.");
1327 goto unm_err_out;
1328 }
1329 NInoSetEncrypted(ni);
1330 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001331 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001333 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1334 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 ntfs_error(vol->sb, "Attribute name is placed after "
1336 "the attribute value.");
1337 goto unm_err_out;
1338 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001339 if (NInoMstProtected(ni)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 ntfs_error(vi->i_sb, "Found mst protected attribute "
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001341 "but the attribute is resident. "
1342 "Please report you saw this message to "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 "linux-ntfs-dev@lists.sourceforge.net");
1344 goto unm_err_out;
1345 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001346 vi->i_size = ni->initialized_size = le32_to_cpu(
1347 a->data.resident.value_length);
1348 ni->allocated_size = le32_to_cpu(a->length) -
1349 le16_to_cpu(a->data.resident.value_offset);
1350 if (vi->i_size > ni->allocated_size) {
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001351 ntfs_error(vi->i_sb, "Resident attribute is corrupt "
1352 "(size exceeds allocation).");
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001353 goto unm_err_out;
1354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 } else {
1356 NInoSetNonResident(ni);
1357 /*
1358 * Ensure the attribute name is placed before the mapping pairs
1359 * array.
1360 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001361 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1362 le16_to_cpu(
1363 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 ntfs_error(vol->sb, "Attribute name is placed after "
1365 "the mapping pairs array.");
1366 goto unm_err_out;
1367 }
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001368 if (NInoCompressed(ni) || NInoSparse(ni)) {
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001369 if (NInoCompressed(ni) && a->data.non_resident.
1370 compression_unit != 4) {
1371 ntfs_error(vi->i_sb, "Found non-standard "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 "compression unit (%u instead "
1373 "of 4). Cannot handle this.",
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001374 a->data.non_resident.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 compression_unit);
1376 err = -EOPNOTSUPP;
1377 goto unm_err_out;
1378 }
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001379 if (a->data.non_resident.compression_unit) {
1380 ni->itype.compressed.block_size = 1U <<
1381 (a->data.non_resident.
1382 compression_unit +
1383 vol->cluster_size_bits);
1384 ni->itype.compressed.block_size_bits =
1385 ffs(ni->itype.compressed.
1386 block_size) - 1;
1387 ni->itype.compressed.block_clusters = 1U <<
1388 a->data.non_resident.
1389 compression_unit;
1390 } else {
1391 ni->itype.compressed.block_size = 0;
1392 ni->itype.compressed.block_size_bits = 0;
1393 ni->itype.compressed.block_clusters = 0;
1394 }
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001395 ni->itype.compressed.size = sle64_to_cpu(
1396 a->data.non_resident.compressed_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001398 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 ntfs_error(vi->i_sb, "First extent of attribute has "
1400 "non-zero lowest_vcn.");
1401 goto unm_err_out;
1402 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001403 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001405 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001407 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 if (NInoMstProtected(ni))
1410 vi->i_mapping->a_ops = &ntfs_mst_aops;
1411 else
1412 vi->i_mapping->a_ops = &ntfs_aops;
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001413 if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 vi->i_blocks = ni->itype.compressed.size >> 9;
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001415 else
1416 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 /*
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001418 * Make sure the base inode does not go away and attach it to the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 * attribute inode.
1420 */
1421 igrab(base_vi);
1422 ni->ext.base_ntfs_ino = base_ni;
1423 ni->nr_extents = -1;
1424
1425 ntfs_attr_put_search_ctx(ctx);
1426 unmap_mft_record(base_ni);
1427
1428 ntfs_debug("Done.");
1429 return 0;
1430
1431unm_err_out:
1432 if (!err)
1433 err = -EIO;
1434 if (ctx)
1435 ntfs_attr_put_search_ctx(ctx);
1436 unmap_mft_record(base_ni);
1437err_out:
1438 ntfs_error(vol->sb, "Failed with error code %i while reading attribute "
1439 "inode (mft_no 0x%lx, type 0x%x, name_len %i). "
1440 "Marking corrupt inode and base inode 0x%lx as bad. "
1441 "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len,
1442 base_vi->i_ino);
1443 make_bad_inode(vi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 if (err != -ENOMEM)
1445 NVolSetErrors(vol);
1446 return err;
1447}
1448
1449/**
1450 * ntfs_read_locked_index_inode - read an index inode from its base inode
1451 * @base_vi: base inode
1452 * @vi: index inode to read
1453 *
1454 * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the
1455 * index inode described by @vi into memory from the base mft record described
1456 * by @base_ni.
1457 *
1458 * ntfs_read_locked_index_inode() maps, pins and locks the base inode for
1459 * reading and looks up the attributes relating to the index described by @vi
1460 * before setting up the necessary fields in @vi as well as initializing the
1461 * ntfs inode.
1462 *
1463 * Note, index inodes are essentially attribute inodes (NInoAttr() is true)
1464 * with the attribute type set to AT_INDEX_ALLOCATION. Apart from that, they
1465 * are setup like directory inodes since directories are a special case of
1466 * indices ao they need to be treated in much the same way. Most importantly,
1467 * for small indices the index allocation attribute might not actually exist.
1468 * However, the index root attribute always exists but this does not need to
1469 * have an inode associated with it and this is why we define a new inode type
1470 * index. Also, like for directories, we need to have an attribute inode for
1471 * the bitmap attribute corresponding to the index allocation attribute and we
1472 * can store this in the appropriate field of the inode, just like we do for
1473 * normal directory inodes.
1474 *
1475 * Q: What locks are held when the function is called?
1476 * A: i_state has I_LOCK set, hence the inode is locked, also
1477 * i_count is set to 1, so it is not going to go away
1478 *
1479 * Return 0 on success and -errno on error. In the error case, the inode will
1480 * have had make_bad_inode() executed on it.
1481 */
1482static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
1483{
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001484 loff_t bvi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 ntfs_volume *vol = NTFS_SB(vi->i_sb);
1486 ntfs_inode *ni, *base_ni, *bni;
1487 struct inode *bvi;
1488 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001489 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 ntfs_attr_search_ctx *ctx;
1491 INDEX_ROOT *ir;
1492 u8 *ir_end, *index_end;
1493 int err = 0;
1494
1495 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1496 ntfs_init_big_inode(vi);
1497 ni = NTFS_I(vi);
1498 base_ni = NTFS_I(base_vi);
1499 /* Just mirror the values from the base inode. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 vi->i_version = base_vi->i_version;
1501 vi->i_uid = base_vi->i_uid;
1502 vi->i_gid = base_vi->i_gid;
1503 vi->i_nlink = base_vi->i_nlink;
1504 vi->i_mtime = base_vi->i_mtime;
1505 vi->i_ctime = base_vi->i_ctime;
1506 vi->i_atime = base_vi->i_atime;
1507 vi->i_generation = ni->seq_no = base_ni->seq_no;
1508 /* Set inode type to zero but preserve permissions. */
1509 vi->i_mode = base_vi->i_mode & ~S_IFMT;
1510 /* Map the mft record for the base inode. */
1511 m = map_mft_record(base_ni);
1512 if (IS_ERR(m)) {
1513 err = PTR_ERR(m);
1514 goto err_out;
1515 }
1516 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1517 if (!ctx) {
1518 err = -ENOMEM;
1519 goto unm_err_out;
1520 }
1521 /* Find the index root attribute. */
1522 err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len,
1523 CASE_SENSITIVE, 0, NULL, 0, ctx);
1524 if (unlikely(err)) {
1525 if (err == -ENOENT)
1526 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
1527 "missing.");
1528 goto unm_err_out;
1529 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001530 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 /* Set up the state. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001532 if (unlikely(a->non_resident)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
1534 goto unm_err_out;
1535 }
1536 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001537 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1538 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
1540 "after the attribute value.");
1541 goto unm_err_out;
1542 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001543 /*
1544 * Compressed/encrypted/sparse index root is not allowed, except for
1545 * directories of course but those are not dealt with here.
1546 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001547 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 ATTR_IS_SPARSE)) {
1549 ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
1550 "root attribute.");
1551 goto unm_err_out;
1552 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001553 ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));
1554 ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
1556 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt.");
1557 goto unm_err_out;
1558 }
1559 index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
1560 if (index_end > ir_end) {
1561 ntfs_error(vi->i_sb, "Index is corrupt.");
1562 goto unm_err_out;
1563 }
1564 if (ir->type) {
1565 ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).",
1566 le32_to_cpu(ir->type));
1567 goto unm_err_out;
1568 }
1569 ni->itype.index.collation_rule = ir->collation_rule;
1570 ntfs_debug("Index collation rule is 0x%x.",
1571 le32_to_cpu(ir->collation_rule));
1572 ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
1573 if (ni->itype.index.block_size & (ni->itype.index.block_size - 1)) {
1574 ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
1575 "two.", ni->itype.index.block_size);
1576 goto unm_err_out;
1577 }
1578 if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
1579 ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE "
1580 "(%ld) is not supported. Sorry.",
1581 ni->itype.index.block_size, PAGE_CACHE_SIZE);
1582 err = -EOPNOTSUPP;
1583 goto unm_err_out;
1584 }
1585 if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
1586 ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE "
1587 "(%i) is not supported. Sorry.",
1588 ni->itype.index.block_size, NTFS_BLOCK_SIZE);
1589 err = -EOPNOTSUPP;
1590 goto unm_err_out;
1591 }
1592 ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1;
1593 /* Determine the size of a vcn in the index. */
1594 if (vol->cluster_size <= ni->itype.index.block_size) {
1595 ni->itype.index.vcn_size = vol->cluster_size;
1596 ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
1597 } else {
1598 ni->itype.index.vcn_size = vol->sector_size;
1599 ni->itype.index.vcn_size_bits = vol->sector_size_bits;
1600 }
1601 /* Check for presence of index allocation attribute. */
1602 if (!(ir->index.flags & LARGE_INDEX)) {
1603 /* No index allocation. */
1604 vi->i_size = ni->initialized_size = ni->allocated_size = 0;
1605 /* We are done with the mft record, so we release it. */
1606 ntfs_attr_put_search_ctx(ctx);
1607 unmap_mft_record(base_ni);
1608 m = NULL;
1609 ctx = NULL;
1610 goto skip_large_index_stuff;
1611 } /* LARGE_INDEX: Index allocation present. Setup state. */
1612 NInoSetIndexAllocPresent(ni);
1613 /* Find index allocation attribute. */
1614 ntfs_attr_reinit_search_ctx(ctx);
1615 err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len,
1616 CASE_SENSITIVE, 0, NULL, 0, ctx);
1617 if (unlikely(err)) {
1618 if (err == -ENOENT)
1619 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1620 "not present but $INDEX_ROOT "
1621 "indicated it is.");
1622 else
1623 ntfs_error(vi->i_sb, "Failed to lookup "
1624 "$INDEX_ALLOCATION attribute.");
1625 goto unm_err_out;
1626 }
Anton Altaparmakova778f212006-03-23 16:18:23 +00001627 a = ctx->attr;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001628 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1630 "resident.");
1631 goto unm_err_out;
1632 }
1633 /*
1634 * Ensure the attribute name is placed before the mapping pairs array.
1635 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001636 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1637 le16_to_cpu(
1638 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
1640 "placed after the mapping pairs array.");
1641 goto unm_err_out;
1642 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001643 if (a->flags & ATTR_IS_ENCRYPTED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1645 "encrypted.");
1646 goto unm_err_out;
1647 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001648 if (a->flags & ATTR_IS_SPARSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
1650 goto unm_err_out;
1651 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001652 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1654 "compressed.");
1655 goto unm_err_out;
1656 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001657 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
1659 "attribute has non zero lowest_vcn.");
1660 goto unm_err_out;
1661 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001662 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001664 a->data.non_resident.initialized_size);
1665 ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 /*
1667 * We are done with the mft record, so we release it. Otherwise
1668 * we would deadlock in ntfs_attr_iget().
1669 */
1670 ntfs_attr_put_search_ctx(ctx);
1671 unmap_mft_record(base_ni);
1672 m = NULL;
1673 ctx = NULL;
1674 /* Get the index bitmap attribute inode. */
1675 bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
1676 if (IS_ERR(bvi)) {
1677 ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
1678 err = PTR_ERR(bvi);
1679 goto unm_err_out;
1680 }
1681 bni = NTFS_I(bvi);
1682 if (NInoCompressed(bni) || NInoEncrypted(bni) ||
1683 NInoSparse(bni)) {
1684 ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
1685 "encrypted and/or sparse.");
1686 goto iput_unm_err_out;
1687 }
1688 /* Consistency check bitmap size vs. index allocation size. */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001689 bvi_size = i_size_read(bvi);
1690 if ((bvi_size << 3) < (vi->i_size >> ni->itype.index.block_size_bits)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for "
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001692 "index allocation (0x%llx).", bvi_size << 3,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 vi->i_size);
1694 goto iput_unm_err_out;
1695 }
Anton Altaparmakov83311912007-01-18 09:42:48 +00001696 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697skip_large_index_stuff:
1698 /* Setup the operations for this index inode. */
1699 vi->i_op = NULL;
1700 vi->i_fop = NULL;
1701 vi->i_mapping->a_ops = &ntfs_mst_aops;
1702 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 /*
1704 * Make sure the base inode doesn't go away and attach it to the
1705 * index inode.
1706 */
1707 igrab(base_vi);
1708 ni->ext.base_ntfs_ino = base_ni;
1709 ni->nr_extents = -1;
1710
1711 ntfs_debug("Done.");
1712 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713iput_unm_err_out:
1714 iput(bvi);
1715unm_err_out:
1716 if (!err)
1717 err = -EIO;
1718 if (ctx)
1719 ntfs_attr_put_search_ctx(ctx);
1720 if (m)
1721 unmap_mft_record(base_ni);
1722err_out:
1723 ntfs_error(vi->i_sb, "Failed with error code %i while reading index "
1724 "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino,
1725 ni->name_len);
1726 make_bad_inode(vi);
1727 if (err != -EOPNOTSUPP && err != -ENOMEM)
1728 NVolSetErrors(vol);
1729 return err;
1730}
1731
Ingo Molnar59345372006-07-03 00:25:18 -07001732/*
1733 * The MFT inode has special locking, so teach the lock validator
1734 * about this by splitting off the locking rules of the MFT from
1735 * the locking rules of other inodes. The MFT inode can never be
1736 * accessed from the VFS side (or even internally), only by the
1737 * map_mft functions.
1738 */
1739static struct lock_class_key mft_ni_runlist_lock_key, mft_ni_mrec_lock_key;
1740
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741/**
1742 * ntfs_read_inode_mount - special read_inode for mount time use only
1743 * @vi: inode to read
1744 *
1745 * Read inode FILE_MFT at mount time, only called with super_block lock
1746 * held from within the read_super() code path.
1747 *
1748 * This function exists because when it is called the page cache for $MFT/$DATA
1749 * is not initialized and hence we cannot get at the contents of mft records
1750 * by calling map_mft_record*().
1751 *
1752 * Further it needs to cope with the circular references problem, i.e. cannot
1753 * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because
1754 * we do not know where the other extent mft records are yet and again, because
1755 * we cannot call map_mft_record*() yet. Obviously this applies only when an
1756 * attribute list is actually present in $MFT inode.
1757 *
1758 * We solve these problems by starting with the $DATA attribute before anything
1759 * else and iterating using ntfs_attr_lookup($DATA) over all extents. As each
1760 * extent is found, we ntfs_mapping_pairs_decompress() including the implied
1761 * ntfs_runlists_merge(). Each step of the iteration necessarily provides
1762 * sufficient information for the next step to complete.
1763 *
1764 * This should work but there are two possible pit falls (see inline comments
1765 * below), but only time will tell if they are real pits or just smoke...
1766 */
1767int ntfs_read_inode_mount(struct inode *vi)
1768{
1769 VCN next_vcn, last_vcn, highest_vcn;
1770 s64 block;
1771 struct super_block *sb = vi->i_sb;
1772 ntfs_volume *vol = NTFS_SB(sb);
1773 struct buffer_head *bh;
1774 ntfs_inode *ni;
1775 MFT_RECORD *m = NULL;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001776 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 ntfs_attr_search_ctx *ctx;
1778 unsigned int i, nr_blocks;
1779 int err;
1780
1781 ntfs_debug("Entering.");
1782
1783 /* Initialize the ntfs specific part of @vi. */
1784 ntfs_init_big_inode(vi);
1785
1786 ni = NTFS_I(vi);
1787
1788 /* Setup the data attribute. It is special as it is mst protected. */
1789 NInoSetNonResident(ni);
1790 NInoSetMstProtected(ni);
Anton Altaparmakovc002f422005-02-03 12:02:56 +00001791 NInoSetSparseDisabled(ni);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 ni->type = AT_DATA;
1793 ni->name = NULL;
1794 ni->name_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 /*
1796 * This sets up our little cheat allowing us to reuse the async read io
1797 * completion handler for directories.
1798 */
1799 ni->itype.index.block_size = vol->mft_record_size;
1800 ni->itype.index.block_size_bits = vol->mft_record_size_bits;
1801
1802 /* Very important! Needed to be able to call map_mft_record*(). */
1803 vol->mft_ino = vi;
1804
1805 /* Allocate enough memory to read the first mft record. */
1806 if (vol->mft_record_size > 64 * 1024) {
1807 ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).",
1808 vol->mft_record_size);
1809 goto err_out;
1810 }
1811 i = vol->mft_record_size;
1812 if (i < sb->s_blocksize)
1813 i = sb->s_blocksize;
1814 m = (MFT_RECORD*)ntfs_malloc_nofs(i);
1815 if (!m) {
1816 ntfs_error(sb, "Failed to allocate buffer for $MFT record 0.");
1817 goto err_out;
1818 }
1819
1820 /* Determine the first block of the $MFT/$DATA attribute. */
1821 block = vol->mft_lcn << vol->cluster_size_bits >>
1822 sb->s_blocksize_bits;
1823 nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits;
1824 if (!nr_blocks)
1825 nr_blocks = 1;
1826
1827 /* Load $MFT/$DATA's first mft record. */
1828 for (i = 0; i < nr_blocks; i++) {
1829 bh = sb_bread(sb, block++);
1830 if (!bh) {
1831 ntfs_error(sb, "Device read failed.");
1832 goto err_out;
1833 }
1834 memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data,
1835 sb->s_blocksize);
1836 brelse(bh);
1837 }
1838
1839 /* Apply the mst fixups. */
1840 if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
1841 /* FIXME: Try to use the $MFTMirr now. */
1842 ntfs_error(sb, "MST fixup failed. $MFT is corrupt.");
1843 goto err_out;
1844 }
1845
1846 /* Need this to sanity check attribute list references to $MFT. */
1847 vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
1848
1849 /* Provides readpage() and sync_page() for map_mft_record(). */
1850 vi->i_mapping->a_ops = &ntfs_mst_aops;
1851
1852 ctx = ntfs_attr_get_search_ctx(ni, m);
1853 if (!ctx) {
1854 err = -ENOMEM;
1855 goto err_out;
1856 }
1857
1858 /* Find the attribute list attribute if present. */
1859 err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
1860 if (err) {
1861 if (unlikely(err != -ENOENT)) {
1862 ntfs_error(sb, "Failed to lookup attribute list "
1863 "attribute. You should run chkdsk.");
1864 goto put_err_out;
1865 }
1866 } else /* if (!err) */ {
1867 ATTR_LIST_ENTRY *al_entry, *next_al_entry;
1868 u8 *al_end;
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001869 static const char *es = " Not allowed. $MFT is corrupt. "
1870 "You should run chkdsk.";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
1872 ntfs_debug("Attribute list attribute found in $MFT.");
1873 NInoSetAttrList(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001874 a = ctx->attr;
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001875 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 ntfs_error(sb, "Attribute list attribute is "
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001877 "compressed.%s", es);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 goto put_err_out;
1879 }
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001880 if (a->flags & ATTR_IS_ENCRYPTED ||
1881 a->flags & ATTR_IS_SPARSE) {
1882 if (a->non_resident) {
1883 ntfs_error(sb, "Non-resident attribute list "
1884 "attribute is encrypted/"
1885 "sparse.%s", es);
1886 goto put_err_out;
1887 }
1888 ntfs_warning(sb, "Resident attribute list attribute "
1889 "in $MFT system file is marked "
1890 "encrypted/sparse which is not true. "
1891 "However, Windows allows this and "
1892 "chkdsk does not detect or correct it "
1893 "so we will just ignore the invalid "
1894 "flags and pretend they are not set.");
1895 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 /* Now allocate memory for the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001897 ni->attr_list_size = (u32)ntfs_attr_size(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
1899 if (!ni->attr_list) {
1900 ntfs_error(sb, "Not enough memory to allocate buffer "
1901 "for attribute list.");
1902 goto put_err_out;
1903 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001904 if (a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 NInoSetAttrListNonResident(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001906 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 ntfs_error(sb, "Attribute list has non zero "
1908 "lowest_vcn. $MFT is corrupt. "
1909 "You should run chkdsk.");
1910 goto put_err_out;
1911 }
1912 /* Setup the runlist. */
1913 ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001914 a, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 if (IS_ERR(ni->attr_list_rl.rl)) {
1916 err = PTR_ERR(ni->attr_list_rl.rl);
1917 ni->attr_list_rl.rl = NULL;
1918 ntfs_error(sb, "Mapping pairs decompression "
1919 "failed with error code %i.",
1920 -err);
1921 goto put_err_out;
1922 }
1923 /* Now load the attribute list. */
1924 if ((err = load_attribute_list(vol, &ni->attr_list_rl,
1925 ni->attr_list, ni->attr_list_size,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001926 sle64_to_cpu(a->data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 non_resident.initialized_size)))) {
1928 ntfs_error(sb, "Failed to load attribute list "
1929 "attribute with error code %i.",
1930 -err);
1931 goto put_err_out;
1932 }
1933 } else /* if (!ctx.attr->non_resident) */ {
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001934 if ((u8*)a + le16_to_cpu(
1935 a->data.resident.value_offset) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001937 a->data.resident.value_length) >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 (u8*)ctx->mrec + vol->mft_record_size) {
1939 ntfs_error(sb, "Corrupt attribute list "
1940 "attribute.");
1941 goto put_err_out;
1942 }
1943 /* Now copy the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001944 memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
1945 a->data.resident.value_offset),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001947 a->data.resident.value_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 }
1949 /* The attribute list is now setup in memory. */
1950 /*
1951 * FIXME: I don't know if this case is actually possible.
1952 * According to logic it is not possible but I have seen too
1953 * many weird things in MS software to rely on logic... Thus we
1954 * perform a manual search and make sure the first $MFT/$DATA
1955 * extent is in the base inode. If it is not we abort with an
1956 * error and if we ever see a report of this error we will need
1957 * to do some magic in order to have the necessary mft record
1958 * loaded and in the right place in the page cache. But
1959 * hopefully logic will prevail and this never happens...
1960 */
1961 al_entry = (ATTR_LIST_ENTRY*)ni->attr_list;
1962 al_end = (u8*)al_entry + ni->attr_list_size;
1963 for (;; al_entry = next_al_entry) {
1964 /* Out of bounds check. */
1965 if ((u8*)al_entry < ni->attr_list ||
1966 (u8*)al_entry > al_end)
1967 goto em_put_err_out;
1968 /* Catch the end of the attribute list. */
1969 if ((u8*)al_entry == al_end)
1970 goto em_put_err_out;
1971 if (!al_entry->length)
1972 goto em_put_err_out;
1973 if ((u8*)al_entry + 6 > al_end || (u8*)al_entry +
1974 le16_to_cpu(al_entry->length) > al_end)
1975 goto em_put_err_out;
1976 next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry +
1977 le16_to_cpu(al_entry->length));
1978 if (le32_to_cpu(al_entry->type) >
1979 const_le32_to_cpu(AT_DATA))
1980 goto em_put_err_out;
1981 if (AT_DATA != al_entry->type)
1982 continue;
1983 /* We want an unnamed attribute. */
1984 if (al_entry->name_length)
1985 goto em_put_err_out;
1986 /* Want the first entry, i.e. lowest_vcn == 0. */
1987 if (al_entry->lowest_vcn)
1988 goto em_put_err_out;
1989 /* First entry has to be in the base mft record. */
1990 if (MREF_LE(al_entry->mft_reference) != vi->i_ino) {
1991 /* MFT references do not match, logic fails. */
1992 ntfs_error(sb, "BUG: The first $DATA extent "
1993 "of $MFT is not in the base "
1994 "mft record. Please report "
1995 "you saw this message to "
1996 "linux-ntfs-dev@lists."
1997 "sourceforge.net");
1998 goto put_err_out;
1999 } else {
2000 /* Sequence numbers must match. */
2001 if (MSEQNO_LE(al_entry->mft_reference) !=
2002 ni->seq_no)
2003 goto em_put_err_out;
2004 /* Got it. All is ok. We can stop now. */
2005 break;
2006 }
2007 }
2008 }
2009
2010 ntfs_attr_reinit_search_ctx(ctx);
2011
2012 /* Now load all attribute extents. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002013 a = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 next_vcn = last_vcn = highest_vcn = 0;
2015 while (!(err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, next_vcn, NULL, 0,
2016 ctx))) {
2017 runlist_element *nrl;
2018
2019 /* Cache the current attribute. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002020 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 /* $MFT must be non-resident. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002022 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 ntfs_error(sb, "$MFT must be non-resident but a "
2024 "resident extent was found. $MFT is "
2025 "corrupt. Run chkdsk.");
2026 goto put_err_out;
2027 }
2028 /* $MFT must be uncompressed and unencrypted. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002029 if (a->flags & ATTR_COMPRESSION_MASK ||
2030 a->flags & ATTR_IS_ENCRYPTED ||
2031 a->flags & ATTR_IS_SPARSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 ntfs_error(sb, "$MFT must be uncompressed, "
2033 "non-sparse, and unencrypted but a "
2034 "compressed/sparse/encrypted extent "
2035 "was found. $MFT is corrupt. Run "
2036 "chkdsk.");
2037 goto put_err_out;
2038 }
2039 /*
2040 * Decompress the mapping pairs array of this extent and merge
2041 * the result into the existing runlist. No need for locking
2042 * as we have exclusive access to the inode at this time and we
2043 * are a mount in progress task, too.
2044 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002045 nrl = ntfs_mapping_pairs_decompress(vol, a, ni->runlist.rl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046 if (IS_ERR(nrl)) {
2047 ntfs_error(sb, "ntfs_mapping_pairs_decompress() "
2048 "failed with error code %ld. $MFT is "
2049 "corrupt.", PTR_ERR(nrl));
2050 goto put_err_out;
2051 }
2052 ni->runlist.rl = nrl;
2053
2054 /* Are we in the first extent? */
2055 if (!next_vcn) {
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002056 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 ntfs_error(sb, "First extent of $DATA "
2058 "attribute has non zero "
2059 "lowest_vcn. $MFT is corrupt. "
2060 "You should run chkdsk.");
2061 goto put_err_out;
2062 }
2063 /* Get the last vcn in the $DATA attribute. */
2064 last_vcn = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002065 a->data.non_resident.allocated_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 >> vol->cluster_size_bits;
2067 /* Fill in the inode size. */
2068 vi->i_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002069 a->data.non_resident.data_size);
2070 ni->initialized_size = sle64_to_cpu(
2071 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002073 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074 /*
2075 * Verify the number of mft records does not exceed
2076 * 2^32 - 1.
2077 */
2078 if ((vi->i_size >> vol->mft_record_size_bits) >=
2079 (1ULL << 32)) {
2080 ntfs_error(sb, "$MFT is too big! Aborting.");
2081 goto put_err_out;
2082 }
2083 /*
2084 * We have got the first extent of the runlist for
2085 * $MFT which means it is now relatively safe to call
2086 * the normal ntfs_read_inode() function.
2087 * Complete reading the inode, this will actually
2088 * re-read the mft record for $MFT, this time entering
2089 * it into the page cache with which we complete the
2090 * kick start of the volume. It should be safe to do
2091 * this now as the first extent of $MFT/$DATA is
2092 * already known and we would hope that we don't need
2093 * further extents in order to find the other
2094 * attributes belonging to $MFT. Only time will tell if
2095 * this is really the case. If not we will have to play
2096 * magic at this point, possibly duplicating a lot of
2097 * ntfs_read_inode() at this point. We will need to
2098 * ensure we do enough of its work to be able to call
2099 * ntfs_read_inode() on extents of $MFT/$DATA. But lets
2100 * hope this never happens...
2101 */
2102 ntfs_read_locked_inode(vi);
2103 if (is_bad_inode(vi)) {
2104 ntfs_error(sb, "ntfs_read_inode() of $MFT "
2105 "failed. BUG or corrupt $MFT. "
2106 "Run chkdsk and if no errors "
2107 "are found, please report you "
2108 "saw this message to "
2109 "linux-ntfs-dev@lists."
2110 "sourceforge.net");
2111 ntfs_attr_put_search_ctx(ctx);
2112 /* Revert to the safe super operations. */
2113 ntfs_free(m);
2114 return -1;
2115 }
2116 /*
2117 * Re-initialize some specifics about $MFT's inode as
2118 * ntfs_read_inode() will have set up the default ones.
2119 */
2120 /* Set uid and gid to root. */
2121 vi->i_uid = vi->i_gid = 0;
2122 /* Regular file. No access for anyone. */
2123 vi->i_mode = S_IFREG;
2124 /* No VFS initiated operations allowed for $MFT. */
2125 vi->i_op = &ntfs_empty_inode_ops;
2126 vi->i_fop = &ntfs_empty_file_ops;
2127 }
2128
2129 /* Get the lowest vcn for the next extent. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002130 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 next_vcn = highest_vcn + 1;
2132
2133 /* Only one extent or error, which we catch below. */
2134 if (next_vcn <= 0)
2135 break;
2136
2137 /* Avoid endless loops due to corruption. */
2138 if (next_vcn < sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002139 a->data.non_resident.lowest_vcn)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 ntfs_error(sb, "$MFT has corrupt attribute list "
2141 "attribute. Run chkdsk.");
2142 goto put_err_out;
2143 }
2144 }
2145 if (err != -ENOENT) {
2146 ntfs_error(sb, "Failed to lookup $MFT/$DATA attribute extent. "
2147 "$MFT is corrupt. Run chkdsk.");
2148 goto put_err_out;
2149 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002150 if (!a) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151 ntfs_error(sb, "$MFT/$DATA attribute not found. $MFT is "
2152 "corrupt. Run chkdsk.");
2153 goto put_err_out;
2154 }
2155 if (highest_vcn && highest_vcn != last_vcn - 1) {
2156 ntfs_error(sb, "Failed to load the complete runlist for "
2157 "$MFT/$DATA. Driver bug or corrupt $MFT. "
2158 "Run chkdsk.");
2159 ntfs_debug("highest_vcn = 0x%llx, last_vcn - 1 = 0x%llx",
2160 (unsigned long long)highest_vcn,
2161 (unsigned long long)last_vcn - 1);
2162 goto put_err_out;
2163 }
2164 ntfs_attr_put_search_ctx(ctx);
2165 ntfs_debug("Done.");
2166 ntfs_free(m);
Ingo Molnar59345372006-07-03 00:25:18 -07002167
2168 /*
2169 * Split the locking rules of the MFT inode from the
2170 * locking rules of other inodes:
2171 */
2172 lockdep_set_class(&ni->runlist.lock, &mft_ni_runlist_lock_key);
2173 lockdep_set_class(&ni->mrec_lock, &mft_ni_mrec_lock_key);
2174
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 return 0;
2176
2177em_put_err_out:
2178 ntfs_error(sb, "Couldn't find first extent of $DATA attribute in "
2179 "attribute list. $MFT is corrupt. Run chkdsk.");
2180put_err_out:
2181 ntfs_attr_put_search_ctx(ctx);
2182err_out:
2183 ntfs_error(sb, "Failed. Marking inode as bad.");
2184 make_bad_inode(vi);
2185 ntfs_free(m);
2186 return -1;
2187}
2188
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189static void __ntfs_clear_inode(ntfs_inode *ni)
2190{
2191 /* Free all alocated memory. */
2192 down_write(&ni->runlist.lock);
2193 if (ni->runlist.rl) {
2194 ntfs_free(ni->runlist.rl);
2195 ni->runlist.rl = NULL;
2196 }
2197 up_write(&ni->runlist.lock);
2198
2199 if (ni->attr_list) {
2200 ntfs_free(ni->attr_list);
2201 ni->attr_list = NULL;
2202 }
2203
2204 down_write(&ni->attr_list_rl.lock);
2205 if (ni->attr_list_rl.rl) {
2206 ntfs_free(ni->attr_list_rl.rl);
2207 ni->attr_list_rl.rl = NULL;
2208 }
2209 up_write(&ni->attr_list_rl.lock);
2210
2211 if (ni->name_len && ni->name != I30) {
2212 /* Catch bugs... */
2213 BUG_ON(!ni->name);
2214 kfree(ni->name);
2215 }
2216}
2217
2218void ntfs_clear_extent_inode(ntfs_inode *ni)
2219{
2220 ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
2221
2222 BUG_ON(NInoAttr(ni));
2223 BUG_ON(ni->nr_extents != -1);
2224
2225#ifdef NTFS_RW
2226 if (NInoDirty(ni)) {
2227 if (!is_bad_inode(VFS_I(ni->ext.base_ntfs_ino)))
2228 ntfs_error(ni->vol->sb, "Clearing dirty extent inode! "
2229 "Losing data! This is a BUG!!!");
2230 // FIXME: Do something!!!
2231 }
2232#endif /* NTFS_RW */
2233
2234 __ntfs_clear_inode(ni);
2235
2236 /* Bye, bye... */
2237 ntfs_destroy_extent_inode(ni);
2238}
2239
2240/**
2241 * ntfs_clear_big_inode - clean up the ntfs specific part of an inode
2242 * @vi: vfs inode pending annihilation
2243 *
2244 * When the VFS is going to remove an inode from memory, ntfs_clear_big_inode()
2245 * is called, which deallocates all memory belonging to the NTFS specific part
2246 * of the inode and returns.
2247 *
2248 * If the MFT record is dirty, we commit it before doing anything else.
2249 */
2250void ntfs_clear_big_inode(struct inode *vi)
2251{
2252 ntfs_inode *ni = NTFS_I(vi);
2253
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254#ifdef NTFS_RW
2255 if (NInoDirty(ni)) {
Richard Knutssonc49c3112006-09-30 23:27:12 -07002256 bool was_bad = (is_bad_inode(vi));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257
2258 /* Committing the inode also commits all extent inodes. */
2259 ntfs_commit_inode(vi);
2260
2261 if (!was_bad && (is_bad_inode(vi) || NInoDirty(ni))) {
2262 ntfs_error(vi->i_sb, "Failed to commit dirty inode "
2263 "0x%lx. Losing data!", vi->i_ino);
2264 // FIXME: Do something!!!
2265 }
2266 }
2267#endif /* NTFS_RW */
2268
2269 /* No need to lock at this stage as no one else has a reference. */
2270 if (ni->nr_extents > 0) {
2271 int i;
2272
2273 for (i = 0; i < ni->nr_extents; i++)
2274 ntfs_clear_extent_inode(ni->ext.extent_ntfs_inos[i]);
2275 kfree(ni->ext.extent_ntfs_inos);
2276 }
2277
2278 __ntfs_clear_inode(ni);
2279
2280 if (NInoAttr(ni)) {
2281 /* Release the base inode if we are holding it. */
2282 if (ni->nr_extents == -1) {
2283 iput(VFS_I(ni->ext.base_ntfs_ino));
2284 ni->nr_extents = 0;
2285 ni->ext.base_ntfs_ino = NULL;
2286 }
2287 }
2288 return;
2289}
2290
2291/**
2292 * ntfs_show_options - show mount options in /proc/mounts
2293 * @sf: seq_file in which to write our mount options
2294 * @mnt: vfs mount whose mount options to display
2295 *
2296 * Called by the VFS once for each mounted ntfs volume when someone reads
2297 * /proc/mounts in order to display the NTFS specific mount options of each
2298 * mount. The mount options of the vfs mount @mnt are written to the seq file
2299 * @sf and success is returned.
2300 */
2301int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt)
2302{
2303 ntfs_volume *vol = NTFS_SB(mnt->mnt_sb);
2304 int i;
2305
2306 seq_printf(sf, ",uid=%i", vol->uid);
2307 seq_printf(sf, ",gid=%i", vol->gid);
2308 if (vol->fmask == vol->dmask)
2309 seq_printf(sf, ",umask=0%o", vol->fmask);
2310 else {
2311 seq_printf(sf, ",fmask=0%o", vol->fmask);
2312 seq_printf(sf, ",dmask=0%o", vol->dmask);
2313 }
2314 seq_printf(sf, ",nls=%s", vol->nls_map->charset);
2315 if (NVolCaseSensitive(vol))
2316 seq_printf(sf, ",case_sensitive");
2317 if (NVolShowSystemFiles(vol))
2318 seq_printf(sf, ",show_sys_files");
Anton Altaparmakovc002f422005-02-03 12:02:56 +00002319 if (!NVolSparseEnabled(vol))
2320 seq_printf(sf, ",disable_sparse");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 for (i = 0; on_errors_arr[i].val; i++) {
2322 if (on_errors_arr[i].val & vol->on_errors)
2323 seq_printf(sf, ",errors=%s", on_errors_arr[i].str);
2324 }
2325 seq_printf(sf, ",mft_zone_multiplier=%i", vol->mft_zone_multiplier);
2326 return 0;
2327}
2328
2329#ifdef NTFS_RW
2330
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002331static const char *es = " Leaving inconsistent metadata. Unmount and run "
2332 "chkdsk.";
2333
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334/**
2335 * ntfs_truncate - called when the i_size of an ntfs inode is changed
2336 * @vi: inode for which the i_size was changed
2337 *
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002338 * We only support i_size changes for normal files at present, i.e. not
2339 * compressed and not encrypted. This is enforced in ntfs_setattr(), see
2340 * below.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341 *
2342 * The kernel guarantees that @vi is a regular file (S_ISREG() is true) and
2343 * that the change is allowed.
2344 *
2345 * This implies for us that @vi is a file inode rather than a directory, index,
2346 * or attribute inode as well as that @vi is a base inode.
2347 *
2348 * Returns 0 on success or -errno on error.
2349 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002350 * Called with ->i_mutex held. In all but one case ->i_alloc_sem is held for
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002351 * writing. The only case in the kernel where ->i_alloc_sem is not held is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 * mm/filemap.c::generic_file_buffered_write() where vmtruncate() is called
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002353 * with the current i_size as the offset. The analogous place in NTFS is in
2354 * fs/ntfs/file.c::ntfs_file_buffered_write() where we call vmtruncate() again
2355 * without holding ->i_alloc_sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 */
2357int ntfs_truncate(struct inode *vi)
2358{
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002359 s64 new_size, old_size, nr_freed, new_alloc_size, old_alloc_size;
2360 VCN highest_vcn;
2361 unsigned long flags;
2362 ntfs_inode *base_ni, *ni = NTFS_I(vi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 ntfs_volume *vol = ni->vol;
2364 ntfs_attr_search_ctx *ctx;
2365 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00002366 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 const char *te = " Leaving file length out of sync with i_size.";
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002368 int err, mp_size, size_change, alloc_change;
2369 u32 attr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370
2371 ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
2372 BUG_ON(NInoAttr(ni));
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002373 BUG_ON(S_ISDIR(vi->i_mode));
2374 BUG_ON(NInoMstProtected(ni));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002375 BUG_ON(ni->nr_extents < 0);
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002376retry_truncate:
2377 /*
2378 * Lock the runlist for writing and map the mft record to ensure it is
2379 * safe to mess with the attribute runlist and sizes.
2380 */
2381 down_write(&ni->runlist.lock);
2382 if (!NInoAttr(ni))
2383 base_ni = ni;
2384 else
2385 base_ni = ni->ext.base_ntfs_ino;
2386 m = map_mft_record(base_ni);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 if (IS_ERR(m)) {
2388 err = PTR_ERR(m);
2389 ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx "
2390 "(error code %d).%s", vi->i_ino, err, te);
2391 ctx = NULL;
2392 m = NULL;
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002393 goto old_bad_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394 }
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002395 ctx = ntfs_attr_get_search_ctx(base_ni, m);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396 if (unlikely(!ctx)) {
2397 ntfs_error(vi->i_sb, "Failed to allocate a search context for "
2398 "inode 0x%lx (not enough memory).%s",
2399 vi->i_ino, te);
2400 err = -ENOMEM;
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002401 goto old_bad_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402 }
2403 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
2404 CASE_SENSITIVE, 0, NULL, 0, ctx);
2405 if (unlikely(err)) {
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002406 if (err == -ENOENT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407 ntfs_error(vi->i_sb, "Open attribute is missing from "
2408 "mft record. Inode 0x%lx is corrupt. "
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002409 "Run chkdsk.%s", vi->i_ino, te);
2410 err = -EIO;
2411 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412 ntfs_error(vi->i_sb, "Failed to lookup attribute in "
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002413 "inode 0x%lx (error code %d).%s",
2414 vi->i_ino, err, te);
2415 goto old_bad_out;
2416 }
2417 m = ctx->mrec;
2418 a = ctx->attr;
2419 /*
2420 * The i_size of the vfs inode is the new size for the attribute value.
2421 */
2422 new_size = i_size_read(vi);
2423 /* The current size of the attribute value is the old size. */
2424 old_size = ntfs_attr_size(a);
2425 /* Calculate the new allocated size. */
2426 if (NInoNonResident(ni))
2427 new_alloc_size = (new_size + vol->cluster_size - 1) &
2428 ~(s64)vol->cluster_size_mask;
2429 else
2430 new_alloc_size = (new_size + 7) & ~7;
2431 /* The current allocated size is the old allocated size. */
2432 read_lock_irqsave(&ni->size_lock, flags);
2433 old_alloc_size = ni->allocated_size;
2434 read_unlock_irqrestore(&ni->size_lock, flags);
2435 /*
2436 * The change in the file size. This will be 0 if no change, >0 if the
2437 * size is growing, and <0 if the size is shrinking.
2438 */
2439 size_change = -1;
2440 if (new_size - old_size >= 0) {
2441 size_change = 1;
2442 if (new_size == old_size)
2443 size_change = 0;
2444 }
2445 /* As above for the allocated size. */
2446 alloc_change = -1;
2447 if (new_alloc_size - old_alloc_size >= 0) {
2448 alloc_change = 1;
2449 if (new_alloc_size == old_alloc_size)
2450 alloc_change = 0;
2451 }
2452 /*
2453 * If neither the size nor the allocation are being changed there is
2454 * nothing to do.
2455 */
2456 if (!size_change && !alloc_change)
2457 goto unm_done;
2458 /* If the size is changing, check if new size is allowed in $AttrDef. */
2459 if (size_change) {
2460 err = ntfs_attr_size_bounds_check(vol, ni->type, new_size);
2461 if (unlikely(err)) {
2462 if (err == -ERANGE) {
2463 ntfs_error(vol->sb, "Truncate would cause the "
2464 "inode 0x%lx to %simum size "
2465 "for its attribute type "
2466 "(0x%x). Aborting truncate.",
2467 vi->i_ino,
2468 new_size > old_size ? "exceed "
2469 "the max" : "go under the min",
2470 le32_to_cpu(ni->type));
2471 err = -EFBIG;
2472 } else {
2473 ntfs_error(vol->sb, "Inode 0x%lx has unknown "
2474 "attribute type 0x%x. "
2475 "Aborting truncate.",
2476 vi->i_ino,
2477 le32_to_cpu(ni->type));
2478 err = -EIO;
2479 }
2480 /* Reset the vfs inode size to the old size. */
2481 i_size_write(vi, old_size);
2482 goto err_out;
2483 }
2484 }
2485 if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2486 ntfs_warning(vi->i_sb, "Changes in inode size are not "
2487 "supported yet for %s files, ignoring.",
2488 NInoCompressed(ni) ? "compressed" :
2489 "encrypted");
2490 err = -EOPNOTSUPP;
2491 goto bad_out;
2492 }
2493 if (a->non_resident)
2494 goto do_non_resident_truncate;
2495 BUG_ON(NInoNonResident(ni));
2496 /* Resize the attribute record to best fit the new attribute size. */
2497 if (new_size < vol->mft_record_size &&
2498 !ntfs_resident_attr_value_resize(m, a, new_size)) {
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002499 /* The resize succeeded! */
2500 flush_dcache_mft_record_page(ctx->ntfs_ino);
2501 mark_mft_record_dirty(ctx->ntfs_ino);
2502 write_lock_irqsave(&ni->size_lock, flags);
2503 /* Update the sizes in the ntfs inode and all is done. */
2504 ni->allocated_size = le32_to_cpu(a->length) -
2505 le16_to_cpu(a->data.resident.value_offset);
2506 /*
2507 * Note ntfs_resident_attr_value_resize() has already done any
2508 * necessary data clearing in the attribute record. When the
2509 * file is being shrunk vmtruncate() will already have cleared
2510 * the top part of the last partial page, i.e. since this is
2511 * the resident case this is the page with index 0. However,
2512 * when the file is being expanded, the page cache page data
2513 * between the old data_size, i.e. old_size, and the new_size
2514 * has not been zeroed. Fortunately, we do not need to zero it
2515 * either since on one hand it will either already be zero due
2516 * to both readpage and writepage clearing partial page data
2517 * beyond i_size in which case there is nothing to do or in the
2518 * case of the file being mmap()ped at the same time, POSIX
2519 * specifies that the behaviour is unspecified thus we do not
2520 * have to do anything. This means that in our implementation
2521 * in the rare case that the file is mmap()ped and a write
2522 * occured into the mmap()ped region just beyond the file size
2523 * and writepage has not yet been called to write out the page
2524 * (which would clear the area beyond the file size) and we now
2525 * extend the file size to incorporate this dirty region
2526 * outside the file size, a write of the page would result in
2527 * this data being written to disk instead of being cleared.
2528 * Given both POSIX and the Linux mmap(2) man page specify that
2529 * this corner case is undefined, we choose to leave it like
2530 * that as this is much simpler for us as we cannot lock the
2531 * relevant page now since we are holding too many ntfs locks
2532 * which would result in a lock reversal deadlock.
2533 */
2534 ni->initialized_size = new_size;
2535 write_unlock_irqrestore(&ni->size_lock, flags);
2536 goto unm_done;
2537 }
2538 /* If the above resize failed, this must be an attribute extension. */
2539 BUG_ON(size_change < 0);
2540 /*
2541 * We have to drop all the locks so we can call
2542 * ntfs_attr_make_non_resident(). This could be optimised by try-
2543 * locking the first page cache page and only if that fails dropping
2544 * the locks, locking the page, and redoing all the locking and
2545 * lookups. While this would be a huge optimisation, it is not worth
2546 * it as this is definitely a slow code path as it only ever can happen
2547 * once for any given file.
2548 */
2549 ntfs_attr_put_search_ctx(ctx);
2550 unmap_mft_record(base_ni);
2551 up_write(&ni->runlist.lock);
2552 /*
2553 * Not enough space in the mft record, try to make the attribute
2554 * non-resident and if successful restart the truncation process.
2555 */
2556 err = ntfs_attr_make_non_resident(ni, old_size);
2557 if (likely(!err))
2558 goto retry_truncate;
2559 /*
2560 * Could not make non-resident. If this is due to this not being
2561 * permitted for this attribute type or there not being enough space,
2562 * try to make other attributes non-resident. Otherwise fail.
2563 */
2564 if (unlikely(err != -EPERM && err != -ENOSPC)) {
2565 ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, attribute "
2566 "type 0x%x, because the conversion from "
2567 "resident to non-resident attribute failed "
2568 "with error code %i.", vi->i_ino,
2569 (unsigned)le32_to_cpu(ni->type), err);
2570 if (err != -ENOMEM)
2571 err = -EIO;
2572 goto conv_err_out;
2573 }
2574 /* TODO: Not implemented from here, abort. */
2575 if (err == -ENOSPC)
2576 ntfs_error(vol->sb, "Not enough space in the mft record/on "
2577 "disk for the non-resident attribute value. "
2578 "This case is not implemented yet.");
2579 else /* if (err == -EPERM) */
2580 ntfs_error(vol->sb, "This attribute type may not be "
2581 "non-resident. This case is not implemented "
2582 "yet.");
2583 err = -EOPNOTSUPP;
2584 goto conv_err_out;
2585#if 0
2586 // TODO: Attempt to make other attributes non-resident.
2587 if (!err)
2588 goto do_resident_extend;
2589 /*
2590 * Both the attribute list attribute and the standard information
2591 * attribute must remain in the base inode. Thus, if this is one of
2592 * these attributes, we have to try to move other attributes out into
2593 * extent mft records instead.
2594 */
2595 if (ni->type == AT_ATTRIBUTE_LIST ||
2596 ni->type == AT_STANDARD_INFORMATION) {
2597 // TODO: Attempt to move other attributes into extent mft
2598 // records.
2599 err = -EOPNOTSUPP;
2600 if (!err)
2601 goto do_resident_extend;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002602 goto err_out;
2603 }
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002604 // TODO: Attempt to move this attribute to an extent mft record, but
2605 // only if it is not already the only attribute in an mft record in
2606 // which case there would be nothing to gain.
2607 err = -EOPNOTSUPP;
2608 if (!err)
2609 goto do_resident_extend;
2610 /* There is nothing we can do to make enough space. )-: */
2611 goto err_out;
2612#endif
2613do_non_resident_truncate:
2614 BUG_ON(!NInoNonResident(ni));
2615 if (alloc_change < 0) {
2616 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
2617 if (highest_vcn > 0 &&
2618 old_alloc_size >> vol->cluster_size_bits >
2619 highest_vcn + 1) {
2620 /*
2621 * This attribute has multiple extents. Not yet
2622 * supported.
2623 */
2624 ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, "
2625 "attribute type 0x%x, because the "
2626 "attribute is highly fragmented (it "
2627 "consists of multiple extents) and "
2628 "this case is not implemented yet.",
2629 vi->i_ino,
2630 (unsigned)le32_to_cpu(ni->type));
2631 err = -EOPNOTSUPP;
2632 goto bad_out;
2633 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634 }
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002635 /*
2636 * If the size is shrinking, need to reduce the initialized_size and
2637 * the data_size before reducing the allocation.
2638 */
2639 if (size_change < 0) {
2640 /*
2641 * Make the valid size smaller (i_size is already up-to-date).
2642 */
2643 write_lock_irqsave(&ni->size_lock, flags);
2644 if (new_size < ni->initialized_size) {
2645 ni->initialized_size = new_size;
2646 a->data.non_resident.initialized_size =
2647 cpu_to_sle64(new_size);
2648 }
2649 a->data.non_resident.data_size = cpu_to_sle64(new_size);
2650 write_unlock_irqrestore(&ni->size_lock, flags);
2651 flush_dcache_mft_record_page(ctx->ntfs_ino);
2652 mark_mft_record_dirty(ctx->ntfs_ino);
2653 /* If the allocated size is not changing, we are done. */
2654 if (!alloc_change)
2655 goto unm_done;
2656 /*
2657 * If the size is shrinking it makes no sense for the
2658 * allocation to be growing.
2659 */
2660 BUG_ON(alloc_change > 0);
2661 } else /* if (size_change >= 0) */ {
2662 /*
2663 * The file size is growing or staying the same but the
2664 * allocation can be shrinking, growing or staying the same.
2665 */
2666 if (alloc_change > 0) {
2667 /*
2668 * We need to extend the allocation and possibly update
2669 * the data size. If we are updating the data size,
2670 * since we are not touching the initialized_size we do
2671 * not need to worry about the actual data on disk.
2672 * And as far as the page cache is concerned, there
2673 * will be no pages beyond the old data size and any
2674 * partial region in the last page between the old and
2675 * new data size (or the end of the page if the new
2676 * data size is outside the page) does not need to be
2677 * modified as explained above for the resident
2678 * attribute truncate case. To do this, we simply drop
2679 * the locks we hold and leave all the work to our
2680 * friendly helper ntfs_attr_extend_allocation().
2681 */
2682 ntfs_attr_put_search_ctx(ctx);
2683 unmap_mft_record(base_ni);
2684 up_write(&ni->runlist.lock);
2685 err = ntfs_attr_extend_allocation(ni, new_size,
2686 size_change > 0 ? new_size : -1, -1);
2687 /*
2688 * ntfs_attr_extend_allocation() will have done error
2689 * output already.
2690 */
2691 goto done;
2692 }
2693 if (!alloc_change)
2694 goto alloc_done;
2695 }
2696 /* alloc_change < 0 */
2697 /* Free the clusters. */
2698 nr_freed = ntfs_cluster_free(ni, new_alloc_size >>
2699 vol->cluster_size_bits, -1, ctx);
2700 m = ctx->mrec;
2701 a = ctx->attr;
2702 if (unlikely(nr_freed < 0)) {
2703 ntfs_error(vol->sb, "Failed to release cluster(s) (error code "
2704 "%lli). Unmount and run chkdsk to recover "
2705 "the lost cluster(s).", (long long)nr_freed);
2706 NVolSetErrors(vol);
2707 nr_freed = 0;
2708 }
2709 /* Truncate the runlist. */
2710 err = ntfs_rl_truncate_nolock(vol, &ni->runlist,
2711 new_alloc_size >> vol->cluster_size_bits);
2712 /*
2713 * If the runlist truncation failed and/or the search context is no
2714 * longer valid, we cannot resize the attribute record or build the
2715 * mapping pairs array thus we mark the inode bad so that no access to
2716 * the freed clusters can happen.
2717 */
2718 if (unlikely(err || IS_ERR(m))) {
2719 ntfs_error(vol->sb, "Failed to %s (error code %li).%s",
2720 IS_ERR(m) ?
2721 "restore attribute search context" :
2722 "truncate attribute runlist",
2723 IS_ERR(m) ? PTR_ERR(m) : err, es);
2724 err = -EIO;
2725 goto bad_out;
2726 }
2727 /* Get the size for the shrunk mapping pairs array for the runlist. */
2728 mp_size = ntfs_get_size_for_mapping_pairs(vol, ni->runlist.rl, 0, -1);
2729 if (unlikely(mp_size <= 0)) {
2730 ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2731 "attribute type 0x%x, because determining the "
2732 "size for the mapping pairs failed with error "
2733 "code %i.%s", vi->i_ino,
2734 (unsigned)le32_to_cpu(ni->type), mp_size, es);
2735 err = -EIO;
2736 goto bad_out;
2737 }
2738 /*
2739 * Shrink the attribute record for the new mapping pairs array. Note,
2740 * this cannot fail since we are making the attribute smaller thus by
2741 * definition there is enough space to do so.
2742 */
2743 attr_len = le32_to_cpu(a->length);
2744 err = ntfs_attr_record_resize(m, a, mp_size +
2745 le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
2746 BUG_ON(err);
2747 /*
2748 * Generate the mapping pairs array directly into the attribute record.
2749 */
2750 err = ntfs_mapping_pairs_build(vol, (u8*)a +
2751 le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
2752 mp_size, ni->runlist.rl, 0, -1, NULL);
2753 if (unlikely(err)) {
2754 ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
2755 "attribute type 0x%x, because building the "
2756 "mapping pairs failed with error code %i.%s",
2757 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
2758 err, es);
2759 err = -EIO;
2760 goto bad_out;
2761 }
2762 /* Update the allocated/compressed size as well as the highest vcn. */
2763 a->data.non_resident.highest_vcn = cpu_to_sle64((new_alloc_size >>
2764 vol->cluster_size_bits) - 1);
2765 write_lock_irqsave(&ni->size_lock, flags);
2766 ni->allocated_size = new_alloc_size;
2767 a->data.non_resident.allocated_size = cpu_to_sle64(new_alloc_size);
2768 if (NInoSparse(ni) || NInoCompressed(ni)) {
2769 if (nr_freed) {
2770 ni->itype.compressed.size -= nr_freed <<
2771 vol->cluster_size_bits;
2772 BUG_ON(ni->itype.compressed.size < 0);
2773 a->data.non_resident.compressed_size = cpu_to_sle64(
2774 ni->itype.compressed.size);
2775 vi->i_blocks = ni->itype.compressed.size >> 9;
2776 }
2777 } else
2778 vi->i_blocks = new_alloc_size >> 9;
2779 write_unlock_irqrestore(&ni->size_lock, flags);
2780 /*
2781 * We have shrunk the allocation. If this is a shrinking truncate we
2782 * have already dealt with the initialized_size and the data_size above
2783 * and we are done. If the truncate is only changing the allocation
2784 * and not the data_size, we are also done. If this is an extending
2785 * truncate, need to extend the data_size now which is ensured by the
2786 * fact that @size_change is positive.
2787 */
2788alloc_done:
2789 /*
2790 * If the size is growing, need to update it now. If it is shrinking,
2791 * we have already updated it above (before the allocation change).
2792 */
2793 if (size_change > 0)
2794 a->data.non_resident.data_size = cpu_to_sle64(new_size);
2795 /* Ensure the modified mft record is written out. */
2796 flush_dcache_mft_record_page(ctx->ntfs_ino);
2797 mark_mft_record_dirty(ctx->ntfs_ino);
2798unm_done:
2799 ntfs_attr_put_search_ctx(ctx);
2800 unmap_mft_record(base_ni);
2801 up_write(&ni->runlist.lock);
2802done:
2803 /* Update the mtime and ctime on the base inode. */
Christoph Hellwig870f4812006-01-09 20:52:01 -08002804 /* normally ->truncate shouldn't update ctime or mtime,
2805 * but ntfs did before so it got a copy & paste version
2806 * of file_update_time. one day someone should fix this
2807 * for real.
2808 */
2809 if (!IS_NOCMTIME(VFS_I(base_ni)) && !IS_RDONLY(VFS_I(base_ni))) {
2810 struct timespec now = current_fs_time(VFS_I(base_ni)->i_sb);
2811 int sync_it = 0;
2812
2813 if (!timespec_equal(&VFS_I(base_ni)->i_mtime, &now) ||
2814 !timespec_equal(&VFS_I(base_ni)->i_ctime, &now))
2815 sync_it = 1;
2816 VFS_I(base_ni)->i_mtime = now;
2817 VFS_I(base_ni)->i_ctime = now;
2818
2819 if (sync_it)
2820 mark_inode_dirty_sync(VFS_I(base_ni));
2821 }
2822
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002823 if (likely(!err)) {
2824 NInoClearTruncateFailed(ni);
2825 ntfs_debug("Done.");
2826 }
2827 return err;
2828old_bad_out:
2829 old_size = -1;
2830bad_out:
Anton Altaparmakova778f212006-03-23 16:18:23 +00002831 if (err != -ENOMEM && err != -EOPNOTSUPP)
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002832 NVolSetErrors(vol);
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002833 if (err != -EOPNOTSUPP)
2834 NInoSetTruncateFailed(ni);
2835 else if (old_size >= 0)
2836 i_size_write(vi, old_size);
2837err_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838 if (ctx)
2839 ntfs_attr_put_search_ctx(ctx);
2840 if (m)
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002841 unmap_mft_record(base_ni);
2842 up_write(&ni->runlist.lock);
2843out:
2844 ntfs_debug("Failed. Returning error code %i.", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002845 return err;
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002846conv_err_out:
Anton Altaparmakova778f212006-03-23 16:18:23 +00002847 if (err != -ENOMEM && err != -EOPNOTSUPP)
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002848 NVolSetErrors(vol);
Anton Altaparmakovdd072332005-10-04 15:39:02 +01002849 if (err != -EOPNOTSUPP)
2850 NInoSetTruncateFailed(ni);
2851 else
2852 i_size_write(vi, old_size);
2853 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854}
2855
2856/**
2857 * ntfs_truncate_vfs - wrapper for ntfs_truncate() that has no return value
2858 * @vi: inode for which the i_size was changed
2859 *
2860 * Wrapper for ntfs_truncate() that has no return value.
2861 *
2862 * See ntfs_truncate() description above for details.
2863 */
2864void ntfs_truncate_vfs(struct inode *vi) {
2865 ntfs_truncate(vi);
2866}
2867
2868/**
2869 * ntfs_setattr - called from notify_change() when an attribute is being changed
2870 * @dentry: dentry whose attributes to change
2871 * @attr: structure describing the attributes and the changes
2872 *
2873 * We have to trap VFS attempts to truncate the file described by @dentry as
2874 * soon as possible, because we do not implement changes in i_size yet. So we
2875 * abort all i_size changes here.
2876 *
2877 * We also abort all changes of user, group, and mode as we do not implement
2878 * the NTFS ACLs yet.
2879 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002880 * Called with ->i_mutex held. For the ATTR_SIZE (i.e. ->truncate) case, also
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881 * called with ->i_alloc_sem held for writing.
2882 *
2883 * Basically this is a copy of generic notify_change() and inode_setattr()
2884 * functionality, except we intercept and abort changes in i_size.
2885 */
2886int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
2887{
2888 struct inode *vi = dentry->d_inode;
2889 int err;
2890 unsigned int ia_valid = attr->ia_valid;
2891
2892 err = inode_change_ok(vi, attr);
2893 if (err)
Anton Altaparmakove9438252005-10-04 16:01:06 +01002894 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 /* We do not support NTFS ACLs yet. */
2896 if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) {
2897 ntfs_warning(vi->i_sb, "Changes in user/group/mode are not "
2898 "supported yet, ignoring.");
2899 err = -EOPNOTSUPP;
2900 goto out;
2901 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 if (ia_valid & ATTR_SIZE) {
2903 if (attr->ia_size != i_size_read(vi)) {
Anton Altaparmakove9438252005-10-04 16:01:06 +01002904 ntfs_inode *ni = NTFS_I(vi);
2905 /*
2906 * FIXME: For now we do not support resizing of
2907 * compressed or encrypted files yet.
2908 */
2909 if (NInoCompressed(ni) || NInoEncrypted(ni)) {
2910 ntfs_warning(vi->i_sb, "Changes in inode size "
2911 "are not supported yet for "
2912 "%s files, ignoring.",
2913 NInoCompressed(ni) ?
2914 "compressed" : "encrypted");
2915 err = -EOPNOTSUPP;
2916 } else
2917 err = vmtruncate(vi, attr->ia_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918 if (err || ia_valid == ATTR_SIZE)
2919 goto out;
2920 } else {
2921 /*
2922 * We skipped the truncate but must still update
2923 * timestamps.
2924 */
Anton Altaparmakov1c7d4692005-09-08 21:15:09 +01002925 ia_valid |= ATTR_MTIME | ATTR_CTIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002926 }
2927 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002928 if (ia_valid & ATTR_ATIME)
Anton Altaparmakov1c7d4692005-09-08 21:15:09 +01002929 vi->i_atime = timespec_trunc(attr->ia_atime,
2930 vi->i_sb->s_time_gran);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931 if (ia_valid & ATTR_MTIME)
Anton Altaparmakov1c7d4692005-09-08 21:15:09 +01002932 vi->i_mtime = timespec_trunc(attr->ia_mtime,
2933 vi->i_sb->s_time_gran);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934 if (ia_valid & ATTR_CTIME)
Anton Altaparmakov1c7d4692005-09-08 21:15:09 +01002935 vi->i_ctime = timespec_trunc(attr->ia_ctime,
2936 vi->i_sb->s_time_gran);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937 mark_inode_dirty(vi);
2938out:
2939 return err;
2940}
2941
2942/**
2943 * ntfs_write_inode - write out a dirty inode
2944 * @vi: inode to write out
2945 * @sync: if true, write out synchronously
2946 *
2947 * Write out a dirty inode to disk including any extent inodes if present.
2948 *
2949 * If @sync is true, commit the inode to disk and wait for io completion. This
2950 * is done using write_mft_record().
2951 *
2952 * If @sync is false, just schedule the write to happen but do not wait for i/o
2953 * completion. In 2.6 kernels, scheduling usually happens just by virtue of
2954 * marking the page (and in this case mft record) dirty but we do not implement
2955 * this yet as write_mft_record() largely ignores the @sync parameter and
2956 * always performs synchronous writes.
2957 *
2958 * Return 0 on success and -errno on error.
2959 */
2960int ntfs_write_inode(struct inode *vi, int sync)
2961{
2962 sle64 nt;
2963 ntfs_inode *ni = NTFS_I(vi);
2964 ntfs_attr_search_ctx *ctx;
2965 MFT_RECORD *m;
2966 STANDARD_INFORMATION *si;
2967 int err = 0;
Richard Knutssonc49c3112006-09-30 23:27:12 -07002968 bool modified = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969
2970 ntfs_debug("Entering for %sinode 0x%lx.", NInoAttr(ni) ? "attr " : "",
2971 vi->i_ino);
2972 /*
2973 * Dirty attribute inodes are written via their real inodes so just
2974 * clean them here. Access time updates are taken care off when the
2975 * real inode is written.
2976 */
2977 if (NInoAttr(ni)) {
2978 NInoClearDirty(ni);
2979 ntfs_debug("Done.");
2980 return 0;
2981 }
2982 /* Map, pin, and lock the mft record belonging to the inode. */
2983 m = map_mft_record(ni);
2984 if (IS_ERR(m)) {
2985 err = PTR_ERR(m);
2986 goto err_out;
2987 }
2988 /* Update the access times in the standard information attribute. */
2989 ctx = ntfs_attr_get_search_ctx(ni, m);
2990 if (unlikely(!ctx)) {
2991 err = -ENOMEM;
2992 goto unm_err_out;
2993 }
2994 err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0,
2995 CASE_SENSITIVE, 0, NULL, 0, ctx);
2996 if (unlikely(err)) {
2997 ntfs_attr_put_search_ctx(ctx);
2998 goto unm_err_out;
2999 }
3000 si = (STANDARD_INFORMATION*)((u8*)ctx->attr +
3001 le16_to_cpu(ctx->attr->data.resident.value_offset));
3002 /* Update the access times if they have changed. */
3003 nt = utc2ntfs(vi->i_mtime);
3004 if (si->last_data_change_time != nt) {
3005 ntfs_debug("Updating mtime for inode 0x%lx: old = 0x%llx, "
Randy Dunlap89075472005-03-03 11:19:53 +00003006 "new = 0x%llx", vi->i_ino, (long long)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007 sle64_to_cpu(si->last_data_change_time),
Randy Dunlap89075472005-03-03 11:19:53 +00003008 (long long)sle64_to_cpu(nt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003009 si->last_data_change_time = nt;
Richard Knutssonc49c3112006-09-30 23:27:12 -07003010 modified = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003011 }
3012 nt = utc2ntfs(vi->i_ctime);
3013 if (si->last_mft_change_time != nt) {
3014 ntfs_debug("Updating ctime for inode 0x%lx: old = 0x%llx, "
Randy Dunlap89075472005-03-03 11:19:53 +00003015 "new = 0x%llx", vi->i_ino, (long long)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016 sle64_to_cpu(si->last_mft_change_time),
Randy Dunlap89075472005-03-03 11:19:53 +00003017 (long long)sle64_to_cpu(nt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 si->last_mft_change_time = nt;
Richard Knutssonc49c3112006-09-30 23:27:12 -07003019 modified = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 }
3021 nt = utc2ntfs(vi->i_atime);
3022 if (si->last_access_time != nt) {
3023 ntfs_debug("Updating atime for inode 0x%lx: old = 0x%llx, "
3024 "new = 0x%llx", vi->i_ino,
Randy Dunlap89075472005-03-03 11:19:53 +00003025 (long long)sle64_to_cpu(si->last_access_time),
3026 (long long)sle64_to_cpu(nt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027 si->last_access_time = nt;
Richard Knutssonc49c3112006-09-30 23:27:12 -07003028 modified = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029 }
3030 /*
3031 * If we just modified the standard information attribute we need to
3032 * mark the mft record it is in dirty. We do this manually so that
3033 * mark_inode_dirty() is not called which would redirty the inode and
3034 * hence result in an infinite loop of trying to write the inode.
3035 * There is no need to mark the base inode nor the base mft record
3036 * dirty, since we are going to write this mft record below in any case
3037 * and the base mft record may actually not have been modified so it
3038 * might not need to be written out.
3039 * NOTE: It is not a problem when the inode for $MFT itself is being
3040 * written out as mark_ntfs_record_dirty() will only set I_DIRTY_PAGES
3041 * on the $MFT inode and hence ntfs_write_inode() will not be
3042 * re-invoked because of it which in turn is ok since the dirtied mft
3043 * record will be cleaned and written out to disk below, i.e. before
3044 * this function returns.
3045 */
Anton Altaparmakov20fdcf12006-03-23 16:21:02 +00003046 if (modified) {
3047 flush_dcache_mft_record_page(ctx->ntfs_ino);
Ingo Molnar4e5e5292006-03-23 16:57:48 +00003048 if (!NInoTestSetDirty(ctx->ntfs_ino))
Anton Altaparmakov20fdcf12006-03-23 16:21:02 +00003049 mark_ntfs_record_dirty(ctx->ntfs_ino->page,
3050 ctx->ntfs_ino->page_ofs);
3051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052 ntfs_attr_put_search_ctx(ctx);
3053 /* Now the access times are updated, write the base mft record. */
3054 if (NInoDirty(ni))
3055 err = write_mft_record(ni, m, sync);
3056 /* Write all attached extent mft records. */
Ingo Molnar4e5e5292006-03-23 16:57:48 +00003057 mutex_lock(&ni->extent_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003058 if (ni->nr_extents > 0) {
3059 ntfs_inode **extent_nis = ni->ext.extent_ntfs_inos;
3060 int i;
3061
3062 ntfs_debug("Writing %i extent inodes.", ni->nr_extents);
3063 for (i = 0; i < ni->nr_extents; i++) {
3064 ntfs_inode *tni = extent_nis[i];
3065
3066 if (NInoDirty(tni)) {
3067 MFT_RECORD *tm = map_mft_record(tni);
3068 int ret;
3069
3070 if (IS_ERR(tm)) {
3071 if (!err || err == -ENOMEM)
3072 err = PTR_ERR(tm);
3073 continue;
3074 }
3075 ret = write_mft_record(tni, tm, sync);
3076 unmap_mft_record(tni);
3077 if (unlikely(ret)) {
3078 if (!err || err == -ENOMEM)
3079 err = ret;
3080 }
3081 }
3082 }
3083 }
Ingo Molnar4e5e5292006-03-23 16:57:48 +00003084 mutex_unlock(&ni->extent_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 unmap_mft_record(ni);
3086 if (unlikely(err))
3087 goto err_out;
3088 ntfs_debug("Done.");
3089 return 0;
3090unm_err_out:
3091 unmap_mft_record(ni);
3092err_out:
3093 if (err == -ENOMEM) {
3094 ntfs_warning(vi->i_sb, "Not enough memory to write inode. "
3095 "Marking the inode dirty again, so the VFS "
3096 "retries later.");
3097 mark_inode_dirty(vi);
3098 } else {
Anton Altaparmakova778f212006-03-23 16:18:23 +00003099 ntfs_error(vi->i_sb, "Failed (error %i): Run chkdsk.", -err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100 NVolSetErrors(ni->vol);
3101 }
3102 return err;
3103}
3104
3105#endif /* NTFS_RW */