blob: 9938034762cca7867007dc841af663b0f097c574 [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>
Robert P. J. Day02d53412009-06-16 15:33:35 -070030#include <linux/log2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include "aops.h"
Anton Altaparmakova0646a12006-03-23 15:53:03 +000033#include "attrib.h"
Anton Altaparmakova778f212006-03-23 16:18:23 +000034#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "dir.h"
36#include "debug.h"
37#include "inode.h"
Anton Altaparmakovdd072332005-10-04 15:39:02 +010038#include "lcnalloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "malloc.h"
40#include "mft.h"
41#include "time.h"
42#include "ntfs.h"
43
44/**
45 * ntfs_test_inode - compare two (possibly fake) inodes for equality
46 * @vi: vfs inode which to test
47 * @na: ntfs attribute which is being tested with
48 *
49 * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
50 * inode @vi for equality with the ntfs attribute @na.
51 *
52 * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
53 * @na->name and @na->name_len are then ignored.
54 *
55 * Return 1 if the attributes match and 0 if not.
56 *
57 * NOTE: This function runs with the inode_lock spin lock held so it is not
58 * allowed to sleep.
59 */
60int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
61{
62 ntfs_inode *ni;
63
64 if (vi->i_ino != na->mft_no)
65 return 0;
66 ni = NTFS_I(vi);
67 /* If !NInoAttr(ni), @vi is a normal file or directory inode. */
68 if (likely(!NInoAttr(ni))) {
69 /* If not looking for a normal inode this is a mismatch. */
70 if (unlikely(na->type != AT_UNUSED))
71 return 0;
72 } else {
73 /* A fake inode describing an attribute. */
74 if (ni->type != na->type)
75 return 0;
76 if (ni->name_len != na->name_len)
77 return 0;
78 if (na->name_len && memcmp(ni->name, na->name,
79 na->name_len * sizeof(ntfschar)))
80 return 0;
81 }
82 /* Match! */
83 return 1;
84}
85
86/**
87 * ntfs_init_locked_inode - initialize an inode
88 * @vi: vfs inode to initialize
89 * @na: ntfs attribute which to initialize @vi to
90 *
91 * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
92 * order to enable ntfs_test_inode() to do its work.
93 *
94 * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
95 * In that case, @na->name and @na->name_len should be set to NULL and 0,
96 * respectively. Although that is not strictly necessary as
Anton Altaparmakov83311912007-01-18 09:42:48 +000097 * ntfs_read_locked_inode() will fill them in later.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 *
99 * Return 0 on success and -errno on error.
100 *
101 * NOTE: This function runs with the inode_lock spin lock held so it is not
102 * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
103 */
104static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
105{
106 ntfs_inode *ni = NTFS_I(vi);
107
108 vi->i_ino = na->mft_no;
109
110 ni->type = na->type;
111 if (na->type == AT_INDEX_ALLOCATION)
112 NInoSetMstProtected(ni);
113
114 ni->name = na->name;
115 ni->name_len = na->name_len;
116
117 /* If initializing a normal inode, we are done. */
118 if (likely(na->type == AT_UNUSED)) {
119 BUG_ON(na->name);
120 BUG_ON(na->name_len);
121 return 0;
122 }
123
124 /* It is a fake inode. */
125 NInoSetAttr(ni);
126
127 /*
128 * We have I30 global constant as an optimization as it is the name
129 * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC
130 * allocation but that is ok. And most attributes are unnamed anyway,
131 * thus the fraction of named attributes with name != I30 is actually
132 * absolutely tiny.
133 */
134 if (na->name_len && na->name != I30) {
135 unsigned int i;
136
137 BUG_ON(!na->name);
138 i = na->name_len * sizeof(ntfschar);
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700139 ni->name = kmalloc(i + sizeof(ntfschar), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (!ni->name)
141 return -ENOMEM;
142 memcpy(ni->name, na->name, i);
Andrew Morton1fc799e2007-05-31 00:40:49 -0700143 ni->name[na->name_len] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145 return 0;
146}
147
148typedef int (*set_t)(struct inode *, void *);
149static int ntfs_read_locked_inode(struct inode *vi);
150static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
151static int ntfs_read_locked_index_inode(struct inode *base_vi,
152 struct inode *vi);
153
154/**
155 * ntfs_iget - obtain a struct inode corresponding to a specific normal inode
156 * @sb: super block of mounted volume
157 * @mft_no: mft record number / inode number to obtain
158 *
159 * Obtain the struct inode corresponding to a specific normal inode (i.e. a
160 * file or directory).
161 *
162 * If the inode is in the cache, it is just returned with an increased
163 * reference count. Otherwise, a new struct inode is allocated and initialized,
164 * and finally ntfs_read_locked_inode() is called to read in the inode and
165 * fill in the remainder of the inode structure.
166 *
167 * Return the struct inode on success. Check the return value with IS_ERR() and
168 * if true, the function failed and the error code is obtained from PTR_ERR().
169 */
170struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
171{
172 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000174 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 na.mft_no = mft_no;
177 na.type = AT_UNUSED;
178 na.name = NULL;
179 na.name_len = 0;
180
181 vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
182 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000183 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return ERR_PTR(-ENOMEM);
185
186 err = 0;
187
188 /* If this is a freshly allocated inode, need to read it now. */
189 if (vi->i_state & I_NEW) {
190 err = ntfs_read_locked_inode(vi);
191 unlock_new_inode(vi);
192 }
193 /*
194 * There is no point in keeping bad inodes around if the failure was
195 * due to ENOMEM. We want to be able to retry again later.
196 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000197 if (unlikely(err == -ENOMEM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 iput(vi);
199 vi = ERR_PTR(err);
200 }
201 return vi;
202}
203
204/**
205 * ntfs_attr_iget - obtain a struct inode corresponding to an attribute
206 * @base_vi: vfs base inode containing the attribute
207 * @type: attribute type
208 * @name: Unicode name of the attribute (NULL if unnamed)
209 * @name_len: length of @name in Unicode characters (0 if unnamed)
210 *
211 * Obtain the (fake) struct inode corresponding to the attribute specified by
212 * @type, @name, and @name_len, which is present in the base mft record
213 * specified by the vfs inode @base_vi.
214 *
215 * If the attribute inode is in the cache, it is just returned with an
216 * increased reference count. Otherwise, a new struct inode is allocated and
217 * initialized, and finally ntfs_read_locked_attr_inode() is called to read the
218 * attribute and fill in the inode structure.
219 *
220 * Note, for index allocation attributes, you need to use ntfs_index_iget()
221 * instead of ntfs_attr_iget() as working with indices is a lot more complex.
222 *
223 * Return the struct inode of the attribute inode on success. Check the return
224 * value with IS_ERR() and if true, the function failed and the error code is
225 * obtained from PTR_ERR().
226 */
227struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
228 ntfschar *name, u32 name_len)
229{
230 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000232 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 /* Make sure no one calls ntfs_attr_iget() for indices. */
235 BUG_ON(type == AT_INDEX_ALLOCATION);
236
237 na.mft_no = base_vi->i_ino;
238 na.type = type;
239 na.name = name;
240 na.name_len = name_len;
241
242 vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
243 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000244 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return ERR_PTR(-ENOMEM);
246
247 err = 0;
248
249 /* If this is a freshly allocated inode, need to read it now. */
250 if (vi->i_state & I_NEW) {
251 err = ntfs_read_locked_attr_inode(base_vi, vi);
252 unlock_new_inode(vi);
253 }
254 /*
255 * There is no point in keeping bad attribute inodes around. This also
256 * simplifies things in that we never need to check for bad attribute
257 * inodes elsewhere.
258 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000259 if (unlikely(err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 iput(vi);
261 vi = ERR_PTR(err);
262 }
263 return vi;
264}
265
266/**
267 * ntfs_index_iget - obtain a struct inode corresponding to an index
268 * @base_vi: vfs base inode containing the index related attributes
269 * @name: Unicode name of the index
270 * @name_len: length of @name in Unicode characters
271 *
272 * Obtain the (fake) struct inode corresponding to the index specified by @name
273 * and @name_len, which is present in the base mft record specified by the vfs
274 * inode @base_vi.
275 *
276 * If the index inode is in the cache, it is just returned with an increased
277 * reference count. Otherwise, a new struct inode is allocated and
278 * initialized, and finally ntfs_read_locked_index_inode() is called to read
279 * the index related attributes and fill in the inode structure.
280 *
281 * Return the struct inode of the index inode on success. Check the return
282 * value with IS_ERR() and if true, the function failed and the error code is
283 * obtained from PTR_ERR().
284 */
285struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
286 u32 name_len)
287{
288 struct inode *vi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 int err;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000290 ntfs_attr na;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 na.mft_no = base_vi->i_ino;
293 na.type = AT_INDEX_ALLOCATION;
294 na.name = name;
295 na.name_len = name_len;
296
297 vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
298 (set_t)ntfs_init_locked_inode, &na);
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000299 if (unlikely(!vi))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return ERR_PTR(-ENOMEM);
301
302 err = 0;
303
304 /* If this is a freshly allocated inode, need to read it now. */
305 if (vi->i_state & I_NEW) {
306 err = ntfs_read_locked_index_inode(base_vi, vi);
307 unlock_new_inode(vi);
308 }
309 /*
310 * There is no point in keeping bad index inodes around. This also
311 * simplifies things in that we never need to check for bad index
312 * inodes elsewhere.
313 */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000314 if (unlikely(err)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 iput(vi);
316 vi = ERR_PTR(err);
317 }
318 return vi;
319}
320
321struct inode *ntfs_alloc_big_inode(struct super_block *sb)
322{
323 ntfs_inode *ni;
324
325 ntfs_debug("Entering.");
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800326 ni = kmem_cache_alloc(ntfs_big_inode_cache, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (likely(ni != NULL)) {
328 ni->state = 0;
329 return VFS_I(ni);
330 }
331 ntfs_error(sb, "Allocation of NTFS big inode structure failed.");
332 return NULL;
333}
334
335void ntfs_destroy_big_inode(struct inode *inode)
336{
337 ntfs_inode *ni = NTFS_I(inode);
338
339 ntfs_debug("Entering.");
340 BUG_ON(ni->page);
341 if (!atomic_dec_and_test(&ni->count))
342 BUG();
343 kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
344}
345
346static inline ntfs_inode *ntfs_alloc_extent_inode(void)
347{
348 ntfs_inode *ni;
349
350 ntfs_debug("Entering.");
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800351 ni = kmem_cache_alloc(ntfs_inode_cache, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (likely(ni != NULL)) {
353 ni->state = 0;
354 return ni;
355 }
356 ntfs_error(NULL, "Allocation of NTFS inode structure failed.");
357 return NULL;
358}
359
360static void ntfs_destroy_extent_inode(ntfs_inode *ni)
361{
362 ntfs_debug("Entering.");
363 BUG_ON(ni->page);
364 if (!atomic_dec_and_test(&ni->count))
365 BUG();
366 kmem_cache_free(ntfs_inode_cache, ni);
367}
368
Ingo Molnar59345372006-07-03 00:25:18 -0700369/*
370 * The attribute runlist lock has separate locking rules from the
371 * normal runlist lock, so split the two lock-classes:
372 */
373static struct lock_class_key attr_list_rl_lock_class;
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/**
376 * __ntfs_init_inode - initialize ntfs specific part of an inode
377 * @sb: super block of mounted volume
378 * @ni: freshly allocated ntfs inode which to initialize
379 *
380 * Initialize an ntfs inode to defaults.
381 *
382 * NOTE: ni->mft_no, ni->state, ni->type, ni->name, and ni->name_len are left
383 * untouched. Make sure to initialize them elsewhere.
384 *
385 * Return zero on success and -ENOMEM on error.
386 */
387void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
388{
389 ntfs_debug("Entering.");
Anton Altaparmakov36763672004-11-18 13:46:45 +0000390 rwlock_init(&ni->size_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 ni->initialized_size = ni->allocated_size = 0;
392 ni->seq_no = 0;
393 atomic_set(&ni->count, 1);
394 ni->vol = NTFS_SB(sb);
395 ntfs_init_runlist(&ni->runlist);
Ingo Molnar4e5e5292006-03-23 16:57:48 +0000396 mutex_init(&ni->mrec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 ni->page = NULL;
398 ni->page_ofs = 0;
399 ni->attr_list_size = 0;
400 ni->attr_list = NULL;
401 ntfs_init_runlist(&ni->attr_list_rl);
Ingo Molnar59345372006-07-03 00:25:18 -0700402 lockdep_set_class(&ni->attr_list_rl.lock,
403 &attr_list_rl_lock_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 ni->itype.index.block_size = 0;
405 ni->itype.index.vcn_size = 0;
406 ni->itype.index.collation_rule = 0;
407 ni->itype.index.block_size_bits = 0;
408 ni->itype.index.vcn_size_bits = 0;
Ingo Molnar4e5e5292006-03-23 16:57:48 +0000409 mutex_init(&ni->extent_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 ni->nr_extents = 0;
411 ni->ext.base_ntfs_ino = NULL;
412}
413
Ingo Molnar59345372006-07-03 00:25:18 -0700414/*
415 * Extent inodes get MFT-mapped in a nested way, while the base inode
416 * is still mapped. Teach this nesting to the lock validator by creating
417 * a separate class for nested inode's mrec_lock's:
418 */
419static struct lock_class_key extent_inode_mrec_lock_key;
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421inline ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
422 unsigned long mft_no)
423{
424 ntfs_inode *ni = ntfs_alloc_extent_inode();
425
426 ntfs_debug("Entering.");
427 if (likely(ni != NULL)) {
428 __ntfs_init_inode(sb, ni);
Ingo Molnar59345372006-07-03 00:25:18 -0700429 lockdep_set_class(&ni->mrec_lock, &extent_inode_mrec_lock_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 ni->mft_no = mft_no;
431 ni->type = AT_UNUSED;
432 ni->name = NULL;
433 ni->name_len = 0;
434 }
435 return ni;
436}
437
438/**
439 * ntfs_is_extended_system_file - check if a file is in the $Extend directory
440 * @ctx: initialized attribute search context
441 *
442 * Search all file name attributes in the inode described by the attribute
443 * search context @ctx and check if any of the names are in the $Extend system
444 * directory.
445 *
446 * Return values:
447 * 1: file is in $Extend directory
448 * 0: file is not in $Extend directory
449 * -errno: failed to determine if the file is in the $Extend directory
450 */
451static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx)
452{
453 int nr_links, err;
454
455 /* Restart search. */
456 ntfs_attr_reinit_search_ctx(ctx);
457
458 /* Get number of hard links. */
459 nr_links = le16_to_cpu(ctx->mrec->link_count);
460
461 /* Loop through all hard links. */
462 while (!(err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0,
463 ctx))) {
464 FILE_NAME_ATTR *file_name_attr;
465 ATTR_RECORD *attr = ctx->attr;
466 u8 *p, *p2;
467
468 nr_links--;
469 /*
470 * Maximum sanity checking as we are called on an inode that
471 * we suspect might be corrupt.
472 */
473 p = (u8*)attr + le32_to_cpu(attr->length);
474 if (p < (u8*)ctx->mrec || (u8*)p > (u8*)ctx->mrec +
475 le32_to_cpu(ctx->mrec->bytes_in_use)) {
476err_corrupt_attr:
477 ntfs_error(ctx->ntfs_ino->vol->sb, "Corrupt file name "
478 "attribute. You should run chkdsk.");
479 return -EIO;
480 }
481 if (attr->non_resident) {
482 ntfs_error(ctx->ntfs_ino->vol->sb, "Non-resident file "
483 "name. You should run chkdsk.");
484 return -EIO;
485 }
486 if (attr->flags) {
487 ntfs_error(ctx->ntfs_ino->vol->sb, "File name with "
488 "invalid flags. You should run "
489 "chkdsk.");
490 return -EIO;
491 }
492 if (!(attr->data.resident.flags & RESIDENT_ATTR_IS_INDEXED)) {
493 ntfs_error(ctx->ntfs_ino->vol->sb, "Unindexed file "
494 "name. You should run chkdsk.");
495 return -EIO;
496 }
497 file_name_attr = (FILE_NAME_ATTR*)((u8*)attr +
498 le16_to_cpu(attr->data.resident.value_offset));
499 p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length);
500 if (p2 < (u8*)attr || p2 > p)
501 goto err_corrupt_attr;
502 /* This attribute is ok, but is it in the $Extend directory? */
503 if (MREF_LE(file_name_attr->parent_directory) == FILE_Extend)
504 return 1; /* YES, it's an extended system file. */
505 }
506 if (unlikely(err != -ENOENT))
507 return err;
508 if (unlikely(nr_links)) {
509 ntfs_error(ctx->ntfs_ino->vol->sb, "Inode hard link count "
510 "doesn't match number of name attributes. You "
511 "should run chkdsk.");
512 return -EIO;
513 }
514 return 0; /* NO, it is not an extended system file. */
515}
516
517/**
518 * ntfs_read_locked_inode - read an inode from its device
519 * @vi: inode to read
520 *
521 * ntfs_read_locked_inode() is called from ntfs_iget() to read the inode
522 * described by @vi into memory from the device.
523 *
524 * The only fields in @vi that we need to/can look at when the function is
525 * called are i_sb, pointing to the mounted device's super block, and i_ino,
526 * the number of the inode to load.
527 *
528 * ntfs_read_locked_inode() maps, pins and locks the mft record number i_ino
529 * for reading and sets up the necessary @vi fields as well as initializing
530 * the ntfs inode.
531 *
532 * Q: What locks are held when the function is called?
533 * A: i_state has I_LOCK set, hence the inode is locked, also
534 * i_count is set to 1, so it is not going to go away
535 * i_flags is set to 0 and we have no business touching it. Only an ioctl()
536 * is allowed to write to them. We should of course be honouring them but
537 * we need to do that using the IS_* macros defined in include/linux/fs.h.
538 * In any case ntfs_read_locked_inode() has nothing to do with i_flags.
539 *
540 * Return 0 on success and -errno on error. In the error case, the inode will
541 * have had make_bad_inode() executed on it.
542 */
543static int ntfs_read_locked_inode(struct inode *vi)
544{
545 ntfs_volume *vol = NTFS_SB(vi->i_sb);
546 ntfs_inode *ni;
Anton Altaparmakov83311912007-01-18 09:42:48 +0000547 struct inode *bvi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000549 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 STANDARD_INFORMATION *si;
551 ntfs_attr_search_ctx *ctx;
552 int err = 0;
553
554 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
555
556 /* Setup the generic vfs inode parts now. */
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 /*
559 * This is for checking whether an inode has changed w.r.t. a file so
560 * that the file can be updated if necessary (compare with f_version).
561 */
562 vi->i_version = 1;
563
564 vi->i_uid = vol->uid;
565 vi->i_gid = vol->gid;
566 vi->i_mode = 0;
567
568 /*
569 * Initialize the ntfs specific part of @vi special casing
570 * FILE_MFT which we need to do at mount time.
571 */
572 if (vi->i_ino != FILE_MFT)
573 ntfs_init_big_inode(vi);
574 ni = NTFS_I(vi);
575
576 m = map_mft_record(ni);
577 if (IS_ERR(m)) {
578 err = PTR_ERR(m);
579 goto err_out;
580 }
581 ctx = ntfs_attr_get_search_ctx(ni, m);
582 if (!ctx) {
583 err = -ENOMEM;
584 goto unm_err_out;
585 }
586
587 if (!(m->flags & MFT_RECORD_IN_USE)) {
588 ntfs_error(vi->i_sb, "Inode is not in use!");
589 goto unm_err_out;
590 }
591 if (m->base_mft_record) {
592 ntfs_error(vi->i_sb, "Inode is an extent inode!");
593 goto unm_err_out;
594 }
595
596 /* Transfer information from mft record into vfs and ntfs inodes. */
597 vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
598
599 /*
600 * FIXME: Keep in mind that link_count is two for files which have both
601 * a long file name and a short file name as separate entries, so if
602 * we are hiding short file names this will be too high. Either we need
603 * to account for the short file names by subtracting them or we need
604 * to make sure we delete files even though i_nlink is not zero which
605 * might be tricky due to vfs interactions. Need to think about this
606 * some more when implementing the unlink command.
607 */
608 vi->i_nlink = le16_to_cpu(m->link_count);
609 /*
610 * FIXME: Reparse points can have the directory bit set even though
611 * they would be S_IFLNK. Need to deal with this further below when we
612 * implement reparse points / symbolic links but it will do for now.
613 * Also if not a directory, it could be something else, rather than
614 * a regular file. But again, will do for now.
615 */
616 /* Everyone gets all permissions. */
617 vi->i_mode |= S_IRWXUGO;
618 /* If read-only, noone gets write permissions. */
619 if (IS_RDONLY(vi))
620 vi->i_mode &= ~S_IWUGO;
621 if (m->flags & MFT_RECORD_IS_DIRECTORY) {
622 vi->i_mode |= S_IFDIR;
623 /*
624 * Apply the directory permissions mask set in the mount
625 * options.
626 */
627 vi->i_mode &= ~vol->dmask;
628 /* Things break without this kludge! */
629 if (vi->i_nlink > 1)
630 vi->i_nlink = 1;
631 } else {
632 vi->i_mode |= S_IFREG;
633 /* Apply the file permissions mask set in the mount options. */
634 vi->i_mode &= ~vol->fmask;
635 }
636 /*
637 * Find the standard information attribute in the mft record. At this
638 * stage we haven't setup the attribute list stuff yet, so this could
639 * in fact fail if the standard information is in an extent record, but
640 * I don't think this actually ever happens.
641 */
642 err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, 0, 0, NULL, 0,
643 ctx);
644 if (unlikely(err)) {
645 if (err == -ENOENT) {
646 /*
647 * TODO: We should be performing a hot fix here (if the
648 * recover mount option is set) by creating a new
649 * attribute.
650 */
651 ntfs_error(vi->i_sb, "$STANDARD_INFORMATION attribute "
652 "is missing.");
653 }
654 goto unm_err_out;
655 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000656 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 /* Get the standard information attribute value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000658 si = (STANDARD_INFORMATION*)((u8*)a +
659 le16_to_cpu(a->data.resident.value_offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 /* Transfer information from the standard information into vi. */
662 /*
663 * Note: The i_?times do not quite map perfectly onto the NTFS times,
664 * but they are close enough, and in the end it doesn't really matter
665 * that much...
666 */
667 /*
668 * mtime is the last change of the data within the file. Not changed
669 * when only metadata is changed, e.g. a rename doesn't affect mtime.
670 */
671 vi->i_mtime = ntfs2utc(si->last_data_change_time);
672 /*
673 * ctime is the last change of the metadata of the file. This obviously
674 * always changes, when mtime is changed. ctime can be changed on its
675 * own, mtime is then not changed, e.g. when a file is renamed.
676 */
677 vi->i_ctime = ntfs2utc(si->last_mft_change_time);
678 /*
679 * Last access to the data within the file. Not changed during a rename
680 * for example but changed whenever the file is written to.
681 */
682 vi->i_atime = ntfs2utc(si->last_access_time);
683
684 /* Find the attribute list attribute if present. */
685 ntfs_attr_reinit_search_ctx(ctx);
686 err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
687 if (err) {
688 if (unlikely(err != -ENOENT)) {
689 ntfs_error(vi->i_sb, "Failed to lookup attribute list "
690 "attribute.");
691 goto unm_err_out;
692 }
693 } else /* if (!err) */ {
694 if (vi->i_ino == FILE_MFT)
695 goto skip_attr_list_load;
696 ntfs_debug("Attribute list found in inode 0x%lx.", vi->i_ino);
697 NInoSetAttrList(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000698 a = ctx->attr;
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000699 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 ntfs_error(vi->i_sb, "Attribute list attribute is "
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000701 "compressed.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 goto unm_err_out;
703 }
Anton Altaparmakov3672b632006-02-24 09:55:07 +0000704 if (a->flags & ATTR_IS_ENCRYPTED ||
705 a->flags & ATTR_IS_SPARSE) {
706 if (a->non_resident) {
707 ntfs_error(vi->i_sb, "Non-resident attribute "
708 "list attribute is encrypted/"
709 "sparse.");
710 goto unm_err_out;
711 }
712 ntfs_warning(vi->i_sb, "Resident attribute list "
713 "attribute in inode 0x%lx is marked "
714 "encrypted/sparse which is not true. "
715 "However, Windows allows this and "
716 "chkdsk does not detect or correct it "
717 "so we will just ignore the invalid "
718 "flags and pretend they are not set.",
719 vi->i_ino);
720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 /* Now allocate memory for the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000722 ni->attr_list_size = (u32)ntfs_attr_size(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
724 if (!ni->attr_list) {
725 ntfs_error(vi->i_sb, "Not enough memory to allocate "
726 "buffer for attribute list.");
727 err = -ENOMEM;
728 goto unm_err_out;
729 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000730 if (a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 NInoSetAttrListNonResident(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000732 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 ntfs_error(vi->i_sb, "Attribute list has non "
734 "zero lowest_vcn.");
735 goto unm_err_out;
736 }
737 /*
738 * Setup the runlist. No need for locking as we have
739 * exclusive access to the inode at this time.
740 */
741 ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000742 a, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (IS_ERR(ni->attr_list_rl.rl)) {
744 err = PTR_ERR(ni->attr_list_rl.rl);
745 ni->attr_list_rl.rl = NULL;
746 ntfs_error(vi->i_sb, "Mapping pairs "
747 "decompression failed.");
748 goto unm_err_out;
749 }
750 /* Now load the attribute list. */
751 if ((err = load_attribute_list(vol, &ni->attr_list_rl,
752 ni->attr_list, ni->attr_list_size,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000753 sle64_to_cpu(a->data.non_resident.
754 initialized_size)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 ntfs_error(vi->i_sb, "Failed to load "
756 "attribute list attribute.");
757 goto unm_err_out;
758 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000759 } else /* if (!a->non_resident) */ {
760 if ((u8*)a + le16_to_cpu(a->data.resident.value_offset)
761 + le32_to_cpu(
762 a->data.resident.value_length) >
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 (u8*)ctx->mrec + vol->mft_record_size) {
764 ntfs_error(vi->i_sb, "Corrupt attribute list "
765 "in inode.");
766 goto unm_err_out;
767 }
768 /* Now copy the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000769 memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
770 a->data.resident.value_offset),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000772 a->data.resident.value_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 }
774 }
775skip_attr_list_load:
776 /*
777 * If an attribute list is present we now have the attribute list value
778 * in ntfs_ino->attr_list and it is ntfs_ino->attr_list_size bytes.
779 */
780 if (S_ISDIR(vi->i_mode)) {
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000781 loff_t bvi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 ntfs_inode *bni;
783 INDEX_ROOT *ir;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000784 u8 *ir_end, *index_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
786 /* It is a directory, find index root attribute. */
787 ntfs_attr_reinit_search_ctx(ctx);
788 err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE,
789 0, NULL, 0, ctx);
790 if (unlikely(err)) {
791 if (err == -ENOENT) {
792 // FIXME: File is corrupt! Hot-fix with empty
793 // index root attribute if recovery option is
794 // set.
795 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute "
796 "is missing.");
797 }
798 goto unm_err_out;
799 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000800 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 /* Set up the state. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000802 if (unlikely(a->non_resident)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
804 "resident.");
805 goto unm_err_out;
806 }
807 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000808 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
809 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
811 "placed after the attribute value.");
812 goto unm_err_out;
813 }
814 /*
815 * Compressed/encrypted index root just means that the newly
816 * created files in that directory should be created compressed/
817 * encrypted. However index root cannot be both compressed and
818 * encrypted.
819 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000820 if (a->flags & ATTR_COMPRESSION_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 NInoSetCompressed(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000822 if (a->flags & ATTR_IS_ENCRYPTED) {
823 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 ntfs_error(vi->i_sb, "Found encrypted and "
825 "compressed attribute.");
826 goto unm_err_out;
827 }
828 NInoSetEncrypted(ni);
829 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000830 if (a->flags & ATTR_IS_SPARSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 NInoSetSparse(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000832 ir = (INDEX_ROOT*)((u8*)a +
833 le16_to_cpu(a->data.resident.value_offset));
834 ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
835 if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
837 "corrupt.");
838 goto unm_err_out;
839 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000840 index_end = (u8*)&ir->index +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 le32_to_cpu(ir->index.index_length);
842 if (index_end > ir_end) {
843 ntfs_error(vi->i_sb, "Directory index is corrupt.");
844 goto unm_err_out;
845 }
846 if (ir->type != AT_FILE_NAME) {
847 ntfs_error(vi->i_sb, "Indexed attribute is not "
848 "$FILE_NAME.");
849 goto unm_err_out;
850 }
851 if (ir->collation_rule != COLLATION_FILE_NAME) {
852 ntfs_error(vi->i_sb, "Index collation rule is not "
853 "COLLATION_FILE_NAME.");
854 goto unm_err_out;
855 }
856 ni->itype.index.collation_rule = ir->collation_rule;
857 ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
858 if (ni->itype.index.block_size &
859 (ni->itype.index.block_size - 1)) {
860 ntfs_error(vi->i_sb, "Index block size (%u) is not a "
861 "power of two.",
862 ni->itype.index.block_size);
863 goto unm_err_out;
864 }
865 if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
866 ntfs_error(vi->i_sb, "Index block size (%u) > "
867 "PAGE_CACHE_SIZE (%ld) is not "
868 "supported. Sorry.",
869 ni->itype.index.block_size,
870 PAGE_CACHE_SIZE);
871 err = -EOPNOTSUPP;
872 goto unm_err_out;
873 }
874 if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
875 ntfs_error(vi->i_sb, "Index block size (%u) < "
876 "NTFS_BLOCK_SIZE (%i) is not "
877 "supported. Sorry.",
878 ni->itype.index.block_size,
879 NTFS_BLOCK_SIZE);
880 err = -EOPNOTSUPP;
881 goto unm_err_out;
882 }
883 ni->itype.index.block_size_bits =
884 ffs(ni->itype.index.block_size) - 1;
885 /* Determine the size of a vcn in the directory index. */
886 if (vol->cluster_size <= ni->itype.index.block_size) {
887 ni->itype.index.vcn_size = vol->cluster_size;
888 ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
889 } else {
890 ni->itype.index.vcn_size = vol->sector_size;
891 ni->itype.index.vcn_size_bits = vol->sector_size_bits;
892 }
893
894 /* Setup the index allocation attribute, even if not present. */
895 NInoSetMstProtected(ni);
896 ni->type = AT_INDEX_ALLOCATION;
897 ni->name = I30;
898 ni->name_len = 4;
899
900 if (!(ir->index.flags & LARGE_INDEX)) {
901 /* No index allocation. */
902 vi->i_size = ni->initialized_size =
903 ni->allocated_size = 0;
904 /* We are done with the mft record, so we release it. */
905 ntfs_attr_put_search_ctx(ctx);
906 unmap_mft_record(ni);
907 m = NULL;
908 ctx = NULL;
909 goto skip_large_dir_stuff;
910 } /* LARGE_INDEX: Index allocation present. Setup state. */
911 NInoSetIndexAllocPresent(ni);
912 /* Find index allocation attribute. */
913 ntfs_attr_reinit_search_ctx(ctx);
914 err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4,
915 CASE_SENSITIVE, 0, NULL, 0, ctx);
916 if (unlikely(err)) {
917 if (err == -ENOENT)
918 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION "
919 "attribute is not present but "
920 "$INDEX_ROOT indicated it is.");
921 else
922 ntfs_error(vi->i_sb, "Failed to lookup "
923 "$INDEX_ALLOCATION "
924 "attribute.");
925 goto unm_err_out;
926 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000927 a = ctx->attr;
928 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
930 "is resident.");
931 goto unm_err_out;
932 }
933 /*
934 * Ensure the attribute name is placed before the mapping pairs
935 * array.
936 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000937 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
938 le16_to_cpu(
939 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
941 "is placed after the mapping pairs "
942 "array.");
943 goto unm_err_out;
944 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000945 if (a->flags & ATTR_IS_ENCRYPTED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
947 "is encrypted.");
948 goto unm_err_out;
949 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000950 if (a->flags & ATTR_IS_SPARSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
952 "is sparse.");
953 goto unm_err_out;
954 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000955 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
957 "is compressed.");
958 goto unm_err_out;
959 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000960 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 ntfs_error(vi->i_sb, "First extent of "
962 "$INDEX_ALLOCATION attribute has non "
963 "zero lowest_vcn.");
964 goto unm_err_out;
965 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000966 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000968 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +0000970 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 /*
972 * We are done with the mft record, so we release it. Otherwise
973 * we would deadlock in ntfs_attr_iget().
974 */
975 ntfs_attr_put_search_ctx(ctx);
976 unmap_mft_record(ni);
977 m = NULL;
978 ctx = NULL;
979 /* Get the index bitmap attribute inode. */
980 bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4);
981 if (IS_ERR(bvi)) {
982 ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
983 err = PTR_ERR(bvi);
984 goto unm_err_out;
985 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 bni = NTFS_I(bvi);
987 if (NInoCompressed(bni) || NInoEncrypted(bni) ||
988 NInoSparse(bni)) {
989 ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
990 "and/or encrypted and/or sparse.");
Anton Altaparmakov83311912007-01-18 09:42:48 +0000991 goto iput_unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 }
993 /* Consistency check bitmap size vs. index allocation size. */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000994 bvi_size = i_size_read(bvi);
995 if ((bvi_size << 3) < (vi->i_size >>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 ni->itype.index.block_size_bits)) {
997 ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
998 "for index allocation (0x%llx).",
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +0000999 bvi_size << 3, vi->i_size);
Anton Altaparmakov83311912007-01-18 09:42:48 +00001000 goto iput_unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 }
Anton Altaparmakov83311912007-01-18 09:42:48 +00001002 /* No longer need the bitmap attribute inode. */
1003 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004skip_large_dir_stuff:
1005 /* Setup the operations for this inode. */
1006 vi->i_op = &ntfs_dir_inode_ops;
1007 vi->i_fop = &ntfs_dir_ops;
1008 } else {
1009 /* It is a file. */
1010 ntfs_attr_reinit_search_ctx(ctx);
1011
1012 /* Setup the data attribute, even if not present. */
1013 ni->type = AT_DATA;
1014 ni->name = NULL;
1015 ni->name_len = 0;
1016
1017 /* Find first extent of the unnamed data attribute. */
1018 err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx);
1019 if (unlikely(err)) {
1020 vi->i_size = ni->initialized_size =
1021 ni->allocated_size = 0;
1022 if (err != -ENOENT) {
1023 ntfs_error(vi->i_sb, "Failed to lookup $DATA "
1024 "attribute.");
1025 goto unm_err_out;
1026 }
1027 /*
1028 * FILE_Secure does not have an unnamed $DATA
1029 * attribute, so we special case it here.
1030 */
1031 if (vi->i_ino == FILE_Secure)
1032 goto no_data_attr_special_case;
1033 /*
1034 * Most if not all the system files in the $Extend
1035 * system directory do not have unnamed data
1036 * attributes so we need to check if the parent
1037 * directory of the file is FILE_Extend and if it is
1038 * ignore this error. To do this we need to get the
1039 * name of this inode from the mft record as the name
1040 * contains the back reference to the parent directory.
1041 */
1042 if (ntfs_is_extended_system_file(ctx) > 0)
1043 goto no_data_attr_special_case;
1044 // FIXME: File is corrupt! Hot-fix with empty data
1045 // attribute if recovery option is set.
1046 ntfs_error(vi->i_sb, "$DATA attribute is missing.");
1047 goto unm_err_out;
1048 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001049 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 /* Setup the state. */
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001051 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1052 if (a->flags & ATTR_COMPRESSION_MASK) {
1053 NInoSetCompressed(ni);
1054 if (vol->cluster_size > 4096) {
1055 ntfs_error(vi->i_sb, "Found "
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001056 "compressed data but "
1057 "compression is "
1058 "disabled due to "
1059 "cluster size (%i) > "
1060 "4kiB.",
1061 vol->cluster_size);
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001062 goto unm_err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001064 if ((a->flags & ATTR_COMPRESSION_MASK)
1065 != ATTR_IS_COMPRESSED) {
1066 ntfs_error(vi->i_sb, "Found unknown "
1067 "compression method "
1068 "or corrupt file.");
1069 goto unm_err_out;
1070 }
1071 }
1072 if (a->flags & ATTR_IS_SPARSE)
1073 NInoSetSparse(ni);
1074 }
1075 if (a->flags & ATTR_IS_ENCRYPTED) {
1076 if (NInoCompressed(ni)) {
1077 ntfs_error(vi->i_sb, "Found encrypted and "
1078 "compressed data.");
1079 goto unm_err_out;
1080 }
1081 NInoSetEncrypted(ni);
1082 }
1083 if (a->non_resident) {
1084 NInoSetNonResident(ni);
1085 if (NInoCompressed(ni) || NInoSparse(ni)) {
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001086 if (NInoCompressed(ni) && a->data.non_resident.
1087 compression_unit != 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 ntfs_error(vi->i_sb, "Found "
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001089 "non-standard "
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001090 "compression unit (%u "
1091 "instead of 4). "
1092 "Cannot handle this.",
1093 a->data.non_resident.
1094 compression_unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 err = -EOPNOTSUPP;
1096 goto unm_err_out;
1097 }
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001098 if (a->data.non_resident.compression_unit) {
1099 ni->itype.compressed.block_size = 1U <<
1100 (a->data.non_resident.
1101 compression_unit +
1102 vol->cluster_size_bits);
1103 ni->itype.compressed.block_size_bits =
1104 ffs(ni->itype.
1105 compressed.
1106 block_size) - 1;
1107 ni->itype.compressed.block_clusters =
1108 1U << a->data.
1109 non_resident.
1110 compression_unit;
1111 } else {
1112 ni->itype.compressed.block_size = 0;
1113 ni->itype.compressed.block_size_bits =
1114 0;
1115 ni->itype.compressed.block_clusters =
1116 0;
1117 }
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001118 ni->itype.compressed.size = sle64_to_cpu(
1119 a->data.non_resident.
1120 compressed_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001122 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 ntfs_error(vi->i_sb, "First extent of $DATA "
1124 "attribute has non zero "
1125 "lowest_vcn.");
1126 goto unm_err_out;
1127 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 vi->i_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001129 a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001131 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001133 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 } else { /* Resident attribute. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001135 vi->i_size = ni->initialized_size = le32_to_cpu(
1136 a->data.resident.value_length);
1137 ni->allocated_size = le32_to_cpu(a->length) -
1138 le16_to_cpu(
1139 a->data.resident.value_offset);
1140 if (vi->i_size > ni->allocated_size) {
1141 ntfs_error(vi->i_sb, "Resident data attribute "
1142 "is corrupt (size exceeds "
1143 "allocation).");
1144 goto unm_err_out;
1145 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 }
1147no_data_attr_special_case:
1148 /* We are done with the mft record, so we release it. */
1149 ntfs_attr_put_search_ctx(ctx);
1150 unmap_mft_record(ni);
1151 m = NULL;
1152 ctx = NULL;
1153 /* Setup the operations for this inode. */
1154 vi->i_op = &ntfs_file_inode_ops;
1155 vi->i_fop = &ntfs_file_ops;
1156 }
1157 if (NInoMstProtected(ni))
1158 vi->i_mapping->a_ops = &ntfs_mst_aops;
1159 else
1160 vi->i_mapping->a_ops = &ntfs_aops;
1161 /*
1162 * The number of 512-byte blocks used on disk (for stat). This is in so
1163 * far inaccurate as it doesn't account for any named streams or other
1164 * special non-resident attributes, but that is how Windows works, too,
1165 * so we are at least consistent with Windows, if not entirely
1166 * consistent with the Linux Way. Doing it the Linux Way would cause a
1167 * significant slowdown as it would involve iterating over all
1168 * attributes in the mft record and adding the allocated/compressed
1169 * sizes of all non-resident attributes present to give us the Linux
1170 * correct size that should go into i_blocks (after division by 512).
1171 */
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001172 if (S_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 vi->i_blocks = ni->itype.compressed.size >> 9;
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001174 else
1175 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 ntfs_debug("Done.");
1177 return 0;
Anton Altaparmakov83311912007-01-18 09:42:48 +00001178iput_unm_err_out:
1179 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180unm_err_out:
1181 if (!err)
1182 err = -EIO;
1183 if (ctx)
1184 ntfs_attr_put_search_ctx(ctx);
1185 if (m)
1186 unmap_mft_record(ni);
1187err_out:
1188 ntfs_error(vol->sb, "Failed with error code %i. Marking corrupt "
1189 "inode 0x%lx as bad. Run chkdsk.", err, vi->i_ino);
1190 make_bad_inode(vi);
1191 if (err != -EOPNOTSUPP && err != -ENOMEM)
1192 NVolSetErrors(vol);
1193 return err;
1194}
1195
1196/**
1197 * ntfs_read_locked_attr_inode - read an attribute inode from its base inode
1198 * @base_vi: base inode
1199 * @vi: attribute inode to read
1200 *
1201 * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the
1202 * attribute inode described by @vi into memory from the base mft record
1203 * described by @base_ni.
1204 *
1205 * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for
1206 * reading and looks up the attribute described by @vi before setting up the
1207 * necessary fields in @vi as well as initializing the ntfs inode.
1208 *
1209 * Q: What locks are held when the function is called?
1210 * A: i_state has I_LOCK set, hence the inode is locked, also
1211 * i_count is set to 1, so it is not going to go away
1212 *
1213 * Return 0 on success and -errno on error. In the error case, the inode will
1214 * have had make_bad_inode() executed on it.
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001215 *
1216 * Note this cannot be called for AT_INDEX_ALLOCATION.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 */
1218static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
1219{
1220 ntfs_volume *vol = NTFS_SB(vi->i_sb);
1221 ntfs_inode *ni, *base_ni;
1222 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001223 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 ntfs_attr_search_ctx *ctx;
1225 int err = 0;
1226
1227 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1228
1229 ntfs_init_big_inode(vi);
1230
1231 ni = NTFS_I(vi);
1232 base_ni = NTFS_I(base_vi);
1233
1234 /* Just mirror the values from the base inode. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 vi->i_version = base_vi->i_version;
1236 vi->i_uid = base_vi->i_uid;
1237 vi->i_gid = base_vi->i_gid;
1238 vi->i_nlink = base_vi->i_nlink;
1239 vi->i_mtime = base_vi->i_mtime;
1240 vi->i_ctime = base_vi->i_ctime;
1241 vi->i_atime = base_vi->i_atime;
1242 vi->i_generation = ni->seq_no = base_ni->seq_no;
1243
1244 /* Set inode type to zero but preserve permissions. */
1245 vi->i_mode = base_vi->i_mode & ~S_IFMT;
1246
1247 m = map_mft_record(base_ni);
1248 if (IS_ERR(m)) {
1249 err = PTR_ERR(m);
1250 goto err_out;
1251 }
1252 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1253 if (!ctx) {
1254 err = -ENOMEM;
1255 goto unm_err_out;
1256 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 /* Find the attribute. */
1258 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1259 CASE_SENSITIVE, 0, NULL, 0, ctx);
1260 if (unlikely(err))
1261 goto unm_err_out;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001262 a = ctx->attr;
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001263 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
1264 if (a->flags & ATTR_COMPRESSION_MASK) {
1265 NInoSetCompressed(ni);
1266 if ((ni->type != AT_DATA) || (ni->type == AT_DATA &&
1267 ni->name_len)) {
1268 ntfs_error(vi->i_sb, "Found compressed "
1269 "non-data or named data "
1270 "attribute. Please report "
1271 "you saw this message to "
1272 "linux-ntfs-dev@lists."
1273 "sourceforge.net");
1274 goto unm_err_out;
1275 }
1276 if (vol->cluster_size > 4096) {
1277 ntfs_error(vi->i_sb, "Found compressed "
1278 "attribute but compression is "
1279 "disabled due to cluster size "
1280 "(%i) > 4kiB.",
1281 vol->cluster_size);
1282 goto unm_err_out;
1283 }
1284 if ((a->flags & ATTR_COMPRESSION_MASK) !=
1285 ATTR_IS_COMPRESSED) {
1286 ntfs_error(vi->i_sb, "Found unknown "
1287 "compression method.");
1288 goto unm_err_out;
1289 }
1290 }
1291 /*
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001292 * The compressed/sparse flag set in an index root just means
1293 * to compress all files.
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001294 */
1295 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1296 ntfs_error(vi->i_sb, "Found mst protected attribute "
1297 "but the attribute is %s. Please "
1298 "report you saw this message to "
1299 "linux-ntfs-dev@lists.sourceforge.net",
1300 NInoCompressed(ni) ? "compressed" :
1301 "sparse");
1302 goto unm_err_out;
1303 }
1304 if (a->flags & ATTR_IS_SPARSE)
1305 NInoSetSparse(ni);
1306 }
1307 if (a->flags & ATTR_IS_ENCRYPTED) {
1308 if (NInoCompressed(ni)) {
1309 ntfs_error(vi->i_sb, "Found encrypted and compressed "
1310 "data.");
1311 goto unm_err_out;
1312 }
1313 /*
1314 * The encryption flag set in an index root just means to
1315 * encrypt all files.
1316 */
1317 if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
1318 ntfs_error(vi->i_sb, "Found mst protected attribute "
1319 "but the attribute is encrypted. "
1320 "Please report you saw this message "
1321 "to linux-ntfs-dev@lists.sourceforge."
1322 "net");
1323 goto unm_err_out;
1324 }
1325 if (ni->type != AT_DATA) {
1326 ntfs_error(vi->i_sb, "Found encrypted non-data "
1327 "attribute.");
1328 goto unm_err_out;
1329 }
1330 NInoSetEncrypted(ni);
1331 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001332 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001334 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1335 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 ntfs_error(vol->sb, "Attribute name is placed after "
1337 "the attribute value.");
1338 goto unm_err_out;
1339 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001340 if (NInoMstProtected(ni)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 ntfs_error(vi->i_sb, "Found mst protected attribute "
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001342 "but the attribute is resident. "
1343 "Please report you saw this message to "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 "linux-ntfs-dev@lists.sourceforge.net");
1345 goto unm_err_out;
1346 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001347 vi->i_size = ni->initialized_size = le32_to_cpu(
1348 a->data.resident.value_length);
1349 ni->allocated_size = le32_to_cpu(a->length) -
1350 le16_to_cpu(a->data.resident.value_offset);
1351 if (vi->i_size > ni->allocated_size) {
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001352 ntfs_error(vi->i_sb, "Resident attribute is corrupt "
1353 "(size exceeds allocation).");
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001354 goto unm_err_out;
1355 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 } else {
1357 NInoSetNonResident(ni);
1358 /*
1359 * Ensure the attribute name is placed before the mapping pairs
1360 * array.
1361 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001362 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1363 le16_to_cpu(
1364 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 ntfs_error(vol->sb, "Attribute name is placed after "
1366 "the mapping pairs array.");
1367 goto unm_err_out;
1368 }
Anton Altaparmakovf6098cf2005-09-19 09:41:39 +01001369 if (NInoCompressed(ni) || NInoSparse(ni)) {
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001370 if (NInoCompressed(ni) && a->data.non_resident.
1371 compression_unit != 4) {
1372 ntfs_error(vi->i_sb, "Found non-standard "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 "compression unit (%u instead "
1374 "of 4). Cannot handle this.",
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001375 a->data.non_resident.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 compression_unit);
1377 err = -EOPNOTSUPP;
1378 goto unm_err_out;
1379 }
Anton Altaparmakova0646a12006-03-23 15:53:03 +00001380 if (a->data.non_resident.compression_unit) {
1381 ni->itype.compressed.block_size = 1U <<
1382 (a->data.non_resident.
1383 compression_unit +
1384 vol->cluster_size_bits);
1385 ni->itype.compressed.block_size_bits =
1386 ffs(ni->itype.compressed.
1387 block_size) - 1;
1388 ni->itype.compressed.block_clusters = 1U <<
1389 a->data.non_resident.
1390 compression_unit;
1391 } else {
1392 ni->itype.compressed.block_size = 0;
1393 ni->itype.compressed.block_size_bits = 0;
1394 ni->itype.compressed.block_clusters = 0;
1395 }
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001396 ni->itype.compressed.size = sle64_to_cpu(
1397 a->data.non_resident.compressed_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001399 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 ntfs_error(vi->i_sb, "First extent of attribute has "
1401 "non-zero lowest_vcn.");
1402 goto unm_err_out;
1403 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001404 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001406 a->data.non_resident.initialized_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 ni->allocated_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001408 a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 if (NInoMstProtected(ni))
1411 vi->i_mapping->a_ops = &ntfs_mst_aops;
1412 else
1413 vi->i_mapping->a_ops = &ntfs_aops;
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001414 if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 vi->i_blocks = ni->itype.compressed.size >> 9;
Anton Altaparmakov9451f852005-03-03 14:43:43 +00001416 else
1417 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 /*
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001419 * Make sure the base inode does not go away and attach it to the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 * attribute inode.
1421 */
1422 igrab(base_vi);
1423 ni->ext.base_ntfs_ino = base_ni;
1424 ni->nr_extents = -1;
1425
1426 ntfs_attr_put_search_ctx(ctx);
1427 unmap_mft_record(base_ni);
1428
1429 ntfs_debug("Done.");
1430 return 0;
1431
1432unm_err_out:
1433 if (!err)
1434 err = -EIO;
1435 if (ctx)
1436 ntfs_attr_put_search_ctx(ctx);
1437 unmap_mft_record(base_ni);
1438err_out:
1439 ntfs_error(vol->sb, "Failed with error code %i while reading attribute "
1440 "inode (mft_no 0x%lx, type 0x%x, name_len %i). "
1441 "Marking corrupt inode and base inode 0x%lx as bad. "
1442 "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len,
1443 base_vi->i_ino);
1444 make_bad_inode(vi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 if (err != -ENOMEM)
1446 NVolSetErrors(vol);
1447 return err;
1448}
1449
1450/**
1451 * ntfs_read_locked_index_inode - read an index inode from its base inode
1452 * @base_vi: base inode
1453 * @vi: index inode to read
1454 *
1455 * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the
1456 * index inode described by @vi into memory from the base mft record described
1457 * by @base_ni.
1458 *
1459 * ntfs_read_locked_index_inode() maps, pins and locks the base inode for
1460 * reading and looks up the attributes relating to the index described by @vi
1461 * before setting up the necessary fields in @vi as well as initializing the
1462 * ntfs inode.
1463 *
1464 * Note, index inodes are essentially attribute inodes (NInoAttr() is true)
1465 * with the attribute type set to AT_INDEX_ALLOCATION. Apart from that, they
1466 * are setup like directory inodes since directories are a special case of
1467 * indices ao they need to be treated in much the same way. Most importantly,
1468 * for small indices the index allocation attribute might not actually exist.
1469 * However, the index root attribute always exists but this does not need to
1470 * have an inode associated with it and this is why we define a new inode type
1471 * index. Also, like for directories, we need to have an attribute inode for
1472 * the bitmap attribute corresponding to the index allocation attribute and we
1473 * can store this in the appropriate field of the inode, just like we do for
1474 * normal directory inodes.
1475 *
1476 * Q: What locks are held when the function is called?
1477 * A: i_state has I_LOCK set, hence the inode is locked, also
1478 * i_count is set to 1, so it is not going to go away
1479 *
1480 * Return 0 on success and -errno on error. In the error case, the inode will
1481 * have had make_bad_inode() executed on it.
1482 */
1483static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
1484{
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001485 loff_t bvi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 ntfs_volume *vol = NTFS_SB(vi->i_sb);
1487 ntfs_inode *ni, *base_ni, *bni;
1488 struct inode *bvi;
1489 MFT_RECORD *m;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001490 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 ntfs_attr_search_ctx *ctx;
1492 INDEX_ROOT *ir;
1493 u8 *ir_end, *index_end;
1494 int err = 0;
1495
1496 ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
1497 ntfs_init_big_inode(vi);
1498 ni = NTFS_I(vi);
1499 base_ni = NTFS_I(base_vi);
1500 /* Just mirror the values from the base inode. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 vi->i_version = base_vi->i_version;
1502 vi->i_uid = base_vi->i_uid;
1503 vi->i_gid = base_vi->i_gid;
1504 vi->i_nlink = base_vi->i_nlink;
1505 vi->i_mtime = base_vi->i_mtime;
1506 vi->i_ctime = base_vi->i_ctime;
1507 vi->i_atime = base_vi->i_atime;
1508 vi->i_generation = ni->seq_no = base_ni->seq_no;
1509 /* Set inode type to zero but preserve permissions. */
1510 vi->i_mode = base_vi->i_mode & ~S_IFMT;
1511 /* Map the mft record for the base inode. */
1512 m = map_mft_record(base_ni);
1513 if (IS_ERR(m)) {
1514 err = PTR_ERR(m);
1515 goto err_out;
1516 }
1517 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1518 if (!ctx) {
1519 err = -ENOMEM;
1520 goto unm_err_out;
1521 }
1522 /* Find the index root attribute. */
1523 err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len,
1524 CASE_SENSITIVE, 0, NULL, 0, ctx);
1525 if (unlikely(err)) {
1526 if (err == -ENOENT)
1527 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
1528 "missing.");
1529 goto unm_err_out;
1530 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001531 a = ctx->attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 /* Set up the state. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001533 if (unlikely(a->non_resident)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
1535 goto unm_err_out;
1536 }
1537 /* Ensure the attribute name is placed before the value. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001538 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1539 le16_to_cpu(a->data.resident.value_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
1541 "after the attribute value.");
1542 goto unm_err_out;
1543 }
Anton Altaparmakov67bb1032005-09-08 21:19:45 +01001544 /*
1545 * Compressed/encrypted/sparse index root is not allowed, except for
1546 * directories of course but those are not dealt with here.
1547 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001548 if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 ATTR_IS_SPARSE)) {
1550 ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
1551 "root attribute.");
1552 goto unm_err_out;
1553 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001554 ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));
1555 ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
1557 ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt.");
1558 goto unm_err_out;
1559 }
1560 index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
1561 if (index_end > ir_end) {
1562 ntfs_error(vi->i_sb, "Index is corrupt.");
1563 goto unm_err_out;
1564 }
1565 if (ir->type) {
1566 ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).",
1567 le32_to_cpu(ir->type));
1568 goto unm_err_out;
1569 }
1570 ni->itype.index.collation_rule = ir->collation_rule;
1571 ntfs_debug("Index collation rule is 0x%x.",
1572 le32_to_cpu(ir->collation_rule));
1573 ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
Robert P. J. Day02d53412009-06-16 15:33:35 -07001574 if (!is_power_of_2(ni->itype.index.block_size)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
1576 "two.", ni->itype.index.block_size);
1577 goto unm_err_out;
1578 }
1579 if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
1580 ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE "
1581 "(%ld) is not supported. Sorry.",
1582 ni->itype.index.block_size, PAGE_CACHE_SIZE);
1583 err = -EOPNOTSUPP;
1584 goto unm_err_out;
1585 }
1586 if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
1587 ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE "
1588 "(%i) is not supported. Sorry.",
1589 ni->itype.index.block_size, NTFS_BLOCK_SIZE);
1590 err = -EOPNOTSUPP;
1591 goto unm_err_out;
1592 }
1593 ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1;
1594 /* Determine the size of a vcn in the index. */
1595 if (vol->cluster_size <= ni->itype.index.block_size) {
1596 ni->itype.index.vcn_size = vol->cluster_size;
1597 ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
1598 } else {
1599 ni->itype.index.vcn_size = vol->sector_size;
1600 ni->itype.index.vcn_size_bits = vol->sector_size_bits;
1601 }
1602 /* Check for presence of index allocation attribute. */
1603 if (!(ir->index.flags & LARGE_INDEX)) {
1604 /* No index allocation. */
1605 vi->i_size = ni->initialized_size = ni->allocated_size = 0;
1606 /* We are done with the mft record, so we release it. */
1607 ntfs_attr_put_search_ctx(ctx);
1608 unmap_mft_record(base_ni);
1609 m = NULL;
1610 ctx = NULL;
1611 goto skip_large_index_stuff;
1612 } /* LARGE_INDEX: Index allocation present. Setup state. */
1613 NInoSetIndexAllocPresent(ni);
1614 /* Find index allocation attribute. */
1615 ntfs_attr_reinit_search_ctx(ctx);
1616 err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len,
1617 CASE_SENSITIVE, 0, NULL, 0, ctx);
1618 if (unlikely(err)) {
1619 if (err == -ENOENT)
1620 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1621 "not present but $INDEX_ROOT "
1622 "indicated it is.");
1623 else
1624 ntfs_error(vi->i_sb, "Failed to lookup "
1625 "$INDEX_ALLOCATION attribute.");
1626 goto unm_err_out;
1627 }
Anton Altaparmakova778f212006-03-23 16:18:23 +00001628 a = ctx->attr;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001629 if (!a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1631 "resident.");
1632 goto unm_err_out;
1633 }
1634 /*
1635 * Ensure the attribute name is placed before the mapping pairs array.
1636 */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001637 if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
1638 le16_to_cpu(
1639 a->data.non_resident.mapping_pairs_offset)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
1641 "placed after the mapping pairs array.");
1642 goto unm_err_out;
1643 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001644 if (a->flags & ATTR_IS_ENCRYPTED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1646 "encrypted.");
1647 goto unm_err_out;
1648 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001649 if (a->flags & ATTR_IS_SPARSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
1651 goto unm_err_out;
1652 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001653 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
1655 "compressed.");
1656 goto unm_err_out;
1657 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001658 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
1660 "attribute has non zero lowest_vcn.");
1661 goto unm_err_out;
1662 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001663 vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 ni->initialized_size = sle64_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001665 a->data.non_resident.initialized_size);
1666 ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 /*
1668 * We are done with the mft record, so we release it. Otherwise
1669 * we would deadlock in ntfs_attr_iget().
1670 */
1671 ntfs_attr_put_search_ctx(ctx);
1672 unmap_mft_record(base_ni);
1673 m = NULL;
1674 ctx = NULL;
1675 /* Get the index bitmap attribute inode. */
1676 bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
1677 if (IS_ERR(bvi)) {
1678 ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
1679 err = PTR_ERR(bvi);
1680 goto unm_err_out;
1681 }
1682 bni = NTFS_I(bvi);
1683 if (NInoCompressed(bni) || NInoEncrypted(bni) ||
1684 NInoSparse(bni)) {
1685 ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
1686 "encrypted and/or sparse.");
1687 goto iput_unm_err_out;
1688 }
1689 /* Consistency check bitmap size vs. index allocation size. */
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001690 bvi_size = i_size_read(bvi);
1691 if ((bvi_size << 3) < (vi->i_size >> ni->itype.index.block_size_bits)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for "
Anton Altaparmakovf50f3ac2004-11-19 22:16:00 +00001693 "index allocation (0x%llx).", bvi_size << 3,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 vi->i_size);
1695 goto iput_unm_err_out;
1696 }
Anton Altaparmakov83311912007-01-18 09:42:48 +00001697 iput(bvi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698skip_large_index_stuff:
1699 /* Setup the operations for this index inode. */
1700 vi->i_op = NULL;
1701 vi->i_fop = NULL;
1702 vi->i_mapping->a_ops = &ntfs_mst_aops;
1703 vi->i_blocks = ni->allocated_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 /*
1705 * Make sure the base inode doesn't go away and attach it to the
1706 * index inode.
1707 */
1708 igrab(base_vi);
1709 ni->ext.base_ntfs_ino = base_ni;
1710 ni->nr_extents = -1;
1711
1712 ntfs_debug("Done.");
1713 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714iput_unm_err_out:
1715 iput(bvi);
1716unm_err_out:
1717 if (!err)
1718 err = -EIO;
1719 if (ctx)
1720 ntfs_attr_put_search_ctx(ctx);
1721 if (m)
1722 unmap_mft_record(base_ni);
1723err_out:
1724 ntfs_error(vi->i_sb, "Failed with error code %i while reading index "
1725 "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino,
1726 ni->name_len);
1727 make_bad_inode(vi);
1728 if (err != -EOPNOTSUPP && err != -ENOMEM)
1729 NVolSetErrors(vol);
1730 return err;
1731}
1732
Ingo Molnar59345372006-07-03 00:25:18 -07001733/*
1734 * The MFT inode has special locking, so teach the lock validator
1735 * about this by splitting off the locking rules of the MFT from
1736 * the locking rules of other inodes. The MFT inode can never be
1737 * accessed from the VFS side (or even internally), only by the
1738 * map_mft functions.
1739 */
1740static struct lock_class_key mft_ni_runlist_lock_key, mft_ni_mrec_lock_key;
1741
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742/**
1743 * ntfs_read_inode_mount - special read_inode for mount time use only
1744 * @vi: inode to read
1745 *
1746 * Read inode FILE_MFT at mount time, only called with super_block lock
1747 * held from within the read_super() code path.
1748 *
1749 * This function exists because when it is called the page cache for $MFT/$DATA
1750 * is not initialized and hence we cannot get at the contents of mft records
1751 * by calling map_mft_record*().
1752 *
1753 * Further it needs to cope with the circular references problem, i.e. cannot
1754 * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because
1755 * we do not know where the other extent mft records are yet and again, because
1756 * we cannot call map_mft_record*() yet. Obviously this applies only when an
1757 * attribute list is actually present in $MFT inode.
1758 *
1759 * We solve these problems by starting with the $DATA attribute before anything
1760 * else and iterating using ntfs_attr_lookup($DATA) over all extents. As each
1761 * extent is found, we ntfs_mapping_pairs_decompress() including the implied
1762 * ntfs_runlists_merge(). Each step of the iteration necessarily provides
1763 * sufficient information for the next step to complete.
1764 *
1765 * This should work but there are two possible pit falls (see inline comments
1766 * below), but only time will tell if they are real pits or just smoke...
1767 */
1768int ntfs_read_inode_mount(struct inode *vi)
1769{
1770 VCN next_vcn, last_vcn, highest_vcn;
1771 s64 block;
1772 struct super_block *sb = vi->i_sb;
1773 ntfs_volume *vol = NTFS_SB(sb);
1774 struct buffer_head *bh;
1775 ntfs_inode *ni;
1776 MFT_RECORD *m = NULL;
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001777 ATTR_RECORD *a;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 ntfs_attr_search_ctx *ctx;
1779 unsigned int i, nr_blocks;
1780 int err;
1781
1782 ntfs_debug("Entering.");
1783
1784 /* Initialize the ntfs specific part of @vi. */
1785 ntfs_init_big_inode(vi);
1786
1787 ni = NTFS_I(vi);
1788
1789 /* Setup the data attribute. It is special as it is mst protected. */
1790 NInoSetNonResident(ni);
1791 NInoSetMstProtected(ni);
Anton Altaparmakovc002f422005-02-03 12:02:56 +00001792 NInoSetSparseDisabled(ni);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 ni->type = AT_DATA;
1794 ni->name = NULL;
1795 ni->name_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 /*
1797 * This sets up our little cheat allowing us to reuse the async read io
1798 * completion handler for directories.
1799 */
1800 ni->itype.index.block_size = vol->mft_record_size;
1801 ni->itype.index.block_size_bits = vol->mft_record_size_bits;
1802
1803 /* Very important! Needed to be able to call map_mft_record*(). */
1804 vol->mft_ino = vi;
1805
1806 /* Allocate enough memory to read the first mft record. */
1807 if (vol->mft_record_size > 64 * 1024) {
1808 ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).",
1809 vol->mft_record_size);
1810 goto err_out;
1811 }
1812 i = vol->mft_record_size;
1813 if (i < sb->s_blocksize)
1814 i = sb->s_blocksize;
1815 m = (MFT_RECORD*)ntfs_malloc_nofs(i);
1816 if (!m) {
1817 ntfs_error(sb, "Failed to allocate buffer for $MFT record 0.");
1818 goto err_out;
1819 }
1820
1821 /* Determine the first block of the $MFT/$DATA attribute. */
1822 block = vol->mft_lcn << vol->cluster_size_bits >>
1823 sb->s_blocksize_bits;
1824 nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits;
1825 if (!nr_blocks)
1826 nr_blocks = 1;
1827
1828 /* Load $MFT/$DATA's first mft record. */
1829 for (i = 0; i < nr_blocks; i++) {
1830 bh = sb_bread(sb, block++);
1831 if (!bh) {
1832 ntfs_error(sb, "Device read failed.");
1833 goto err_out;
1834 }
1835 memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data,
1836 sb->s_blocksize);
1837 brelse(bh);
1838 }
1839
1840 /* Apply the mst fixups. */
1841 if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
1842 /* FIXME: Try to use the $MFTMirr now. */
1843 ntfs_error(sb, "MST fixup failed. $MFT is corrupt.");
1844 goto err_out;
1845 }
1846
1847 /* Need this to sanity check attribute list references to $MFT. */
1848 vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
1849
1850 /* Provides readpage() and sync_page() for map_mft_record(). */
1851 vi->i_mapping->a_ops = &ntfs_mst_aops;
1852
1853 ctx = ntfs_attr_get_search_ctx(ni, m);
1854 if (!ctx) {
1855 err = -ENOMEM;
1856 goto err_out;
1857 }
1858
1859 /* Find the attribute list attribute if present. */
1860 err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
1861 if (err) {
1862 if (unlikely(err != -ENOENT)) {
1863 ntfs_error(sb, "Failed to lookup attribute list "
1864 "attribute. You should run chkdsk.");
1865 goto put_err_out;
1866 }
1867 } else /* if (!err) */ {
1868 ATTR_LIST_ENTRY *al_entry, *next_al_entry;
1869 u8 *al_end;
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001870 static const char *es = " Not allowed. $MFT is corrupt. "
1871 "You should run chkdsk.";
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872
1873 ntfs_debug("Attribute list attribute found in $MFT.");
1874 NInoSetAttrList(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001875 a = ctx->attr;
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001876 if (a->flags & ATTR_COMPRESSION_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 ntfs_error(sb, "Attribute list attribute is "
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001878 "compressed.%s", es);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 goto put_err_out;
1880 }
Anton Altaparmakov3672b632006-02-24 09:55:07 +00001881 if (a->flags & ATTR_IS_ENCRYPTED ||
1882 a->flags & ATTR_IS_SPARSE) {
1883 if (a->non_resident) {
1884 ntfs_error(sb, "Non-resident attribute list "
1885 "attribute is encrypted/"
1886 "sparse.%s", es);
1887 goto put_err_out;
1888 }
1889 ntfs_warning(sb, "Resident attribute list attribute "
1890 "in $MFT system file is marked "
1891 "encrypted/sparse which is not true. "
1892 "However, Windows allows this and "
1893 "chkdsk does not detect or correct it "
1894 "so we will just ignore the invalid "
1895 "flags and pretend they are not set.");
1896 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 /* Now allocate memory for the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001898 ni->attr_list_size = (u32)ntfs_attr_size(a);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
1900 if (!ni->attr_list) {
1901 ntfs_error(sb, "Not enough memory to allocate buffer "
1902 "for attribute list.");
1903 goto put_err_out;
1904 }
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001905 if (a->non_resident) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 NInoSetAttrListNonResident(ni);
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001907 if (a->data.non_resident.lowest_vcn) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 ntfs_error(sb, "Attribute list has non zero "
1909 "lowest_vcn. $MFT is corrupt. "
1910 "You should run chkdsk.");
1911 goto put_err_out;
1912 }
1913 /* Setup the runlist. */
1914 ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001915 a, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 if (IS_ERR(ni->attr_list_rl.rl)) {
1917 err = PTR_ERR(ni->attr_list_rl.rl);
1918 ni->attr_list_rl.rl = NULL;
1919 ntfs_error(sb, "Mapping pairs decompression "
1920 "failed with error code %i.",
1921 -err);
1922 goto put_err_out;
1923 }
1924 /* Now load the attribute list. */
1925 if ((err = load_attribute_list(vol, &ni->attr_list_rl,
1926 ni->attr_list, ni->attr_list_size,
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001927 sle64_to_cpu(a->data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 non_resident.initialized_size)))) {
1929 ntfs_error(sb, "Failed to load attribute list "
1930 "attribute with error code %i.",
1931 -err);
1932 goto put_err_out;
1933 }
1934 } else /* if (!ctx.attr->non_resident) */ {
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001935 if ((u8*)a + le16_to_cpu(
1936 a->data.resident.value_offset) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001938 a->data.resident.value_length) >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 (u8*)ctx->mrec + vol->mft_record_size) {
1940 ntfs_error(sb, "Corrupt attribute list "
1941 "attribute.");
1942 goto put_err_out;
1943 }
1944 /* Now copy the attribute list. */
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001945 memcpy(ni->attr_list, (u8*)a + le16_to_cpu(
1946 a->data.resident.value_offset),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 le32_to_cpu(
Anton Altaparmakov5ae9fcf2005-03-02 17:03:24 +00001948 a->data.resident.value_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 }
1950 /* The attribute list is now setup in memory. */
1951 /*
1952 * FIXME: I don't know if this case is actually possible.
1953 * According to logic it is not possible but I have seen too
1954 * many weird things in MS software to rely on logic... Thus we
1955 * perform a manual search and make sure the first $MFT/$DATA
1956 * extent is in the base inode. If it is not we abort with an
1957 * error and if we ever see a report of this error we will need
1958 * to do some magic in order to have the necessary mft record
1959 * loaded and in the right place in the page cache. But
1960 * hopefully logic will prevail and this never happens...
1961 */
1962 al_entry = (ATTR_LIST_ENTRY*)ni->attr_list;
1963 al_end = (u8*)al_entry + ni->attr_list_size;
1964 for (;; al_entry = next_al_entry) {
1965 /* Out of bounds check. */
1966 if ((u8*)al_entry < ni->attr_list ||
1967 (u8*)al_entry > al_end)
1968 goto em_put_err_out;
1969 /* Catch the end of the attribute list. */
1970 if ((u8*)al_entry == al_end)
1971 goto em_put_err_out;
1972 if (!al_entry->length)
1973 goto em_put_err_out;
1974 if ((u8*)al_entry + 6 > al_end || (u8*)al_entry +
1975 le16_to_cpu(al_entry->length) > al_end)
1976 goto em_put_err_out;
1977 next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry +
1978 le16_to_cpu(al_entry->length));
Harvey Harrison63cd8852009-03-31 15:23:52 -07001979 if (le32_to_cpu(al_entry->type) > le32_to_cpu(AT_DATA))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 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 */