blob: 9d383e5eff0ea5519bffb34528b5aeccbe6f3831 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Anton Altaparmakovf25dfb52005-09-08 20:35:33 +01002 * file.c - NTFS kernel file operations. Part of the Linux-NTFS project.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Anton Altaparmakova632f552015-03-11 10:43:32 -04004 * Copyright (c) 2001-2015 Anton Altaparmakov and Tuxera Inc.
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
Christoph Hellwigde1414a2015-01-14 10:42:36 +010022#include <linux/backing-dev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/gfp.h>
Anton Altaparmakov98b27032005-10-11 15:40:40 +010025#include <linux/pagemap.h>
26#include <linux/pagevec.h>
27#include <linux/sched.h>
28#include <linux/swap.h>
29#include <linux/uio.h>
30#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Anton Altaparmakov98b27032005-10-11 15:40:40 +010032#include <asm/page.h>
33#include <asm/uaccess.h>
34
35#include "attrib.h"
36#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "inode.h"
38#include "debug.h"
Anton Altaparmakov98b27032005-10-11 15:40:40 +010039#include "lcnalloc.h"
40#include "malloc.h"
41#include "mft.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include "ntfs.h"
43
44/**
45 * ntfs_file_open - called when an inode is about to be opened
46 * @vi: inode to be opened
47 * @filp: file structure describing the inode
48 *
49 * Limit file size to the page cache limit on architectures where unsigned long
50 * is 32-bits. This is the most we can do for now without overflowing the page
51 * cache page index. Doing it this way means we don't run into problems because
52 * of existing too large files. It would be better to allow the user to read
53 * the beginning of the file but I doubt very much anyone is going to hit this
54 * check on a 32-bit architecture, so there is no point in adding the extra
55 * complexity required to support this.
56 *
57 * On 64-bit architectures, the check is hopefully optimized away by the
58 * compiler.
59 *
60 * After the check passes, just call generic_file_open() to do its work.
61 */
62static int ntfs_file_open(struct inode *vi, struct file *filp)
63{
64 if (sizeof(unsigned long) < 8) {
Anton Altaparmakovd4b9ba72004-11-17 15:45:08 +000065 if (i_size_read(vi) > MAX_LFS_FILESIZE)
Alan Coxa9c62a12007-10-16 23:30:22 -070066 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 }
68 return generic_file_open(vi, filp);
69}
70
71#ifdef NTFS_RW
72
73/**
Anton Altaparmakov98b27032005-10-11 15:40:40 +010074 * ntfs_attr_extend_initialized - extend the initialized size of an attribute
75 * @ni: ntfs inode of the attribute to extend
76 * @new_init_size: requested new initialized size in bytes
Anton Altaparmakov98b27032005-10-11 15:40:40 +010077 *
78 * Extend the initialized size of an attribute described by the ntfs inode @ni
79 * to @new_init_size bytes. This involves zeroing any non-sparse space between
80 * the old initialized size and @new_init_size both in the page cache and on
Anton Altaparmakovdda65b92005-10-24 08:57:59 +010081 * disk (if relevant complete pages are already uptodate in the page cache then
82 * these are simply marked dirty).
Anton Altaparmakov98b27032005-10-11 15:40:40 +010083 *
84 * As a side-effect, the file size (vfs inode->i_size) may be incremented as,
85 * in the resident attribute case, it is tied to the initialized size and, in
86 * the non-resident attribute case, it may not fall below the initialized size.
87 *
88 * Note that if the attribute is resident, we do not need to touch the page
89 * cache at all. This is because if the page cache page is not uptodate we
90 * bring it uptodate later, when doing the write to the mft record since we
91 * then already have the page mapped. And if the page is uptodate, the
92 * non-initialized region will already have been zeroed when the page was
93 * brought uptodate and the region may in fact already have been overwritten
94 * with new data via mmap() based writes, so we cannot just zero it. And since
95 * POSIX specifies that the behaviour of resizing a file whilst it is mmap()ped
96 * is unspecified, we choose not to do zeroing and thus we do not need to touch
Anton Altaparmakovdda65b92005-10-24 08:57:59 +010097 * the page at all. For a more detailed explanation see ntfs_truncate() in
98 * fs/ntfs/inode.c.
Anton Altaparmakov98b27032005-10-11 15:40:40 +010099 *
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100100 * Return 0 on success and -errno on error. In the case that an error is
101 * encountered it is possible that the initialized size will already have been
102 * incremented some way towards @new_init_size but it is guaranteed that if
103 * this is the case, the necessary zeroing will also have happened and that all
104 * metadata is self-consistent.
105 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800106 * Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
Anton Altaparmakovdda65b92005-10-24 08:57:59 +0100107 * held by the caller.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100108 */
Minchan Kim2ec93b02010-05-24 14:33:06 -0700109static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size)
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100110{
111 s64 old_init_size;
112 loff_t old_i_size;
113 pgoff_t index, end_index;
114 unsigned long flags;
115 struct inode *vi = VFS_I(ni);
116 ntfs_inode *base_ni;
117 MFT_RECORD *m = NULL;
118 ATTR_RECORD *a;
119 ntfs_attr_search_ctx *ctx = NULL;
120 struct address_space *mapping;
121 struct page *page = NULL;
122 u8 *kattr;
123 int err;
124 u32 attr_len;
125
126 read_lock_irqsave(&ni->size_lock, flags);
127 old_init_size = ni->initialized_size;
128 old_i_size = i_size_read(vi);
129 BUG_ON(new_init_size > ni->allocated_size);
130 read_unlock_irqrestore(&ni->size_lock, flags);
131 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
132 "old_initialized_size 0x%llx, "
133 "new_initialized_size 0x%llx, i_size 0x%llx.",
134 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
135 (unsigned long long)old_init_size,
136 (unsigned long long)new_init_size, old_i_size);
137 if (!NInoAttr(ni))
138 base_ni = ni;
139 else
140 base_ni = ni->ext.base_ntfs_ino;
141 /* Use goto to reduce indentation and we need the label below anyway. */
142 if (NInoNonResident(ni))
143 goto do_non_resident_extend;
144 BUG_ON(old_init_size != old_i_size);
145 m = map_mft_record(base_ni);
146 if (IS_ERR(m)) {
147 err = PTR_ERR(m);
148 m = NULL;
149 goto err_out;
150 }
151 ctx = ntfs_attr_get_search_ctx(base_ni, m);
152 if (unlikely(!ctx)) {
153 err = -ENOMEM;
154 goto err_out;
155 }
156 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
157 CASE_SENSITIVE, 0, NULL, 0, ctx);
158 if (unlikely(err)) {
159 if (err == -ENOENT)
160 err = -EIO;
161 goto err_out;
162 }
163 m = ctx->mrec;
164 a = ctx->attr;
165 BUG_ON(a->non_resident);
166 /* The total length of the attribute value. */
167 attr_len = le32_to_cpu(a->data.resident.value_length);
168 BUG_ON(old_i_size != (loff_t)attr_len);
169 /*
170 * Do the zeroing in the mft record and update the attribute size in
171 * the mft record.
172 */
173 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
174 memset(kattr + attr_len, 0, new_init_size - attr_len);
175 a->data.resident.value_length = cpu_to_le32((u32)new_init_size);
176 /* Finally, update the sizes in the vfs and ntfs inodes. */
177 write_lock_irqsave(&ni->size_lock, flags);
178 i_size_write(vi, new_init_size);
179 ni->initialized_size = new_init_size;
180 write_unlock_irqrestore(&ni->size_lock, flags);
181 goto done;
182do_non_resident_extend:
183 /*
184 * If the new initialized size @new_init_size exceeds the current file
185 * size (vfs inode->i_size), we need to extend the file size to the
186 * new initialized size.
187 */
188 if (new_init_size > old_i_size) {
189 m = map_mft_record(base_ni);
190 if (IS_ERR(m)) {
191 err = PTR_ERR(m);
192 m = NULL;
193 goto err_out;
194 }
195 ctx = ntfs_attr_get_search_ctx(base_ni, m);
196 if (unlikely(!ctx)) {
197 err = -ENOMEM;
198 goto err_out;
199 }
200 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
201 CASE_SENSITIVE, 0, NULL, 0, ctx);
202 if (unlikely(err)) {
203 if (err == -ENOENT)
204 err = -EIO;
205 goto err_out;
206 }
207 m = ctx->mrec;
208 a = ctx->attr;
209 BUG_ON(!a->non_resident);
210 BUG_ON(old_i_size != (loff_t)
211 sle64_to_cpu(a->data.non_resident.data_size));
212 a->data.non_resident.data_size = cpu_to_sle64(new_init_size);
213 flush_dcache_mft_record_page(ctx->ntfs_ino);
214 mark_mft_record_dirty(ctx->ntfs_ino);
215 /* Update the file size in the vfs inode. */
216 i_size_write(vi, new_init_size);
217 ntfs_attr_put_search_ctx(ctx);
218 ctx = NULL;
219 unmap_mft_record(base_ni);
220 m = NULL;
221 }
222 mapping = vi->i_mapping;
223 index = old_init_size >> PAGE_CACHE_SHIFT;
224 end_index = (new_init_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
225 do {
226 /*
227 * Read the page. If the page is not present, this will zero
228 * the uninitialized regions for us.
229 */
Pekka Enberg090d2b12006-06-23 02:05:08 -0700230 page = read_mapping_page(mapping, index, NULL);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100231 if (IS_ERR(page)) {
232 err = PTR_ERR(page);
233 goto init_err_out;
234 }
Nick Piggin6fe69002007-05-06 14:49:04 -0700235 if (unlikely(PageError(page))) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100236 page_cache_release(page);
237 err = -EIO;
238 goto init_err_out;
239 }
240 /*
241 * Update the initialized size in the ntfs inode. This is
242 * enough to make ntfs_writepage() work.
243 */
244 write_lock_irqsave(&ni->size_lock, flags);
Anton Altaparmakov3c6af7f2005-11-24 13:41:33 +0000245 ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100246 if (ni->initialized_size > new_init_size)
247 ni->initialized_size = new_init_size;
248 write_unlock_irqrestore(&ni->size_lock, flags);
249 /* Set the page dirty so it gets written out. */
250 set_page_dirty(page);
251 page_cache_release(page);
252 /*
253 * Play nice with the vm and the rest of the system. This is
254 * very much needed as we can potentially be modifying the
255 * initialised size from a very small value to a really huge
256 * value, e.g.
257 * f = open(somefile, O_TRUNC);
258 * truncate(f, 10GiB);
259 * seek(f, 10GiB);
260 * write(f, 1);
261 * And this would mean we would be marking dirty hundreds of
262 * thousands of pages or as in the above example more than
263 * two and a half million pages!
264 *
265 * TODO: For sparse pages could optimize this workload by using
266 * the FsMisc / MiscFs page bit as a "PageIsSparse" bit. This
267 * would be set in readpage for sparse pages and here we would
268 * not need to mark dirty any pages which have this bit set.
269 * The only caveat is that we have to clear the bit everywhere
270 * where we allocate any clusters that lie in the page or that
271 * contain the page.
272 *
273 * TODO: An even greater optimization would be for us to only
274 * call readpage() on pages which are not in sparse regions as
275 * determined from the runlist. This would greatly reduce the
276 * number of pages we read and make dirty in the case of sparse
277 * files.
278 */
279 balance_dirty_pages_ratelimited(mapping);
280 cond_resched();
281 } while (++index < end_index);
282 read_lock_irqsave(&ni->size_lock, flags);
283 BUG_ON(ni->initialized_size != new_init_size);
284 read_unlock_irqrestore(&ni->size_lock, flags);
285 /* Now bring in sync the initialized_size in the mft record. */
286 m = map_mft_record(base_ni);
287 if (IS_ERR(m)) {
288 err = PTR_ERR(m);
289 m = NULL;
290 goto init_err_out;
291 }
292 ctx = ntfs_attr_get_search_ctx(base_ni, m);
293 if (unlikely(!ctx)) {
294 err = -ENOMEM;
295 goto init_err_out;
296 }
297 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
298 CASE_SENSITIVE, 0, NULL, 0, ctx);
299 if (unlikely(err)) {
300 if (err == -ENOENT)
301 err = -EIO;
302 goto init_err_out;
303 }
304 m = ctx->mrec;
305 a = ctx->attr;
306 BUG_ON(!a->non_resident);
307 a->data.non_resident.initialized_size = cpu_to_sle64(new_init_size);
308done:
309 flush_dcache_mft_record_page(ctx->ntfs_ino);
310 mark_mft_record_dirty(ctx->ntfs_ino);
311 if (ctx)
312 ntfs_attr_put_search_ctx(ctx);
313 if (m)
314 unmap_mft_record(base_ni);
315 ntfs_debug("Done, initialized_size 0x%llx, i_size 0x%llx.",
316 (unsigned long long)new_init_size, i_size_read(vi));
317 return 0;
318init_err_out:
319 write_lock_irqsave(&ni->size_lock, flags);
320 ni->initialized_size = old_init_size;
321 write_unlock_irqrestore(&ni->size_lock, flags);
322err_out:
323 if (ctx)
324 ntfs_attr_put_search_ctx(ctx);
325 if (m)
326 unmap_mft_record(base_ni);
327 ntfs_debug("Failed. Returning error code %i.", err);
328 return err;
329}
330
Al Viroccca2682015-04-05 14:06:24 -0400331static ssize_t ntfs_prepare_file_for_write(struct kiocb *iocb,
332 struct iov_iter *from)
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100333{
Anton Altaparmakova632f552015-03-11 10:43:32 -0400334 loff_t pos;
335 s64 end, ll;
336 ssize_t err;
337 unsigned long flags;
Al Viroccca2682015-04-05 14:06:24 -0400338 struct file *file = iocb->ki_filp;
Anton Altaparmakova632f552015-03-11 10:43:32 -0400339 struct inode *vi = file_inode(file);
340 ntfs_inode *base_ni, *ni = NTFS_I(vi);
341 ntfs_volume *vol = ni->vol;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100342
Anton Altaparmakova632f552015-03-11 10:43:32 -0400343 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, pos "
Al Viroccca2682015-04-05 14:06:24 -0400344 "0x%llx, count 0x%zx.", vi->i_ino,
Anton Altaparmakova632f552015-03-11 10:43:32 -0400345 (unsigned)le32_to_cpu(ni->type),
Al Viro3309dd02015-04-09 12:55:47 -0400346 (unsigned long long)iocb->ki_pos,
347 iov_iter_count(from));
348 err = generic_write_checks(iocb, from);
349 if (unlikely(err <= 0))
Al Viroccca2682015-04-05 14:06:24 -0400350 goto out;
Anton Altaparmakova632f552015-03-11 10:43:32 -0400351 /*
352 * All checks have passed. Before we start doing any writing we want
353 * to abort any totally illegal writes.
354 */
355 BUG_ON(NInoMstProtected(ni));
356 BUG_ON(ni->type != AT_DATA);
357 /* If file is encrypted, deny access, just like NT4. */
358 if (NInoEncrypted(ni)) {
359 /* Only $DATA attributes can be encrypted. */
360 /*
361 * Reminder for later: Encrypted files are _always_
362 * non-resident so that the content can always be encrypted.
363 */
364 ntfs_debug("Denying write access to encrypted file.");
365 err = -EACCES;
366 goto out;
367 }
368 if (NInoCompressed(ni)) {
369 /* Only unnamed $DATA attribute can be compressed. */
370 BUG_ON(ni->name_len);
371 /*
372 * Reminder for later: If resident, the data is not actually
373 * compressed. Only on the switch to non-resident does
374 * compression kick in. This is in contrast to encrypted files
375 * (see above).
376 */
377 ntfs_error(vi->i_sb, "Writing to compressed files is not "
378 "implemented yet. Sorry.");
379 err = -EOPNOTSUPP;
380 goto out;
381 }
Anton Altaparmakova632f552015-03-11 10:43:32 -0400382 base_ni = ni;
383 if (NInoAttr(ni))
384 base_ni = ni->ext.base_ntfs_ino;
Jan Kara5fa8e0a2015-05-21 16:05:53 +0200385 err = file_remove_privs(file);
Anton Altaparmakova632f552015-03-11 10:43:32 -0400386 if (unlikely(err))
387 goto out;
388 /*
389 * Our ->update_time method always succeeds thus file_update_time()
390 * cannot fail either so there is no need to check the return code.
391 */
392 file_update_time(file);
Al Viroccca2682015-04-05 14:06:24 -0400393 pos = iocb->ki_pos;
Anton Altaparmakova632f552015-03-11 10:43:32 -0400394 /* The first byte after the last cluster being written to. */
Al Viroccca2682015-04-05 14:06:24 -0400395 end = (pos + iov_iter_count(from) + vol->cluster_size_mask) &
Anton Altaparmakova632f552015-03-11 10:43:32 -0400396 ~(u64)vol->cluster_size_mask;
397 /*
398 * If the write goes beyond the allocated size, extend the allocation
399 * to cover the whole of the write, rounded up to the nearest cluster.
400 */
401 read_lock_irqsave(&ni->size_lock, flags);
402 ll = ni->allocated_size;
403 read_unlock_irqrestore(&ni->size_lock, flags);
404 if (end > ll) {
405 /*
406 * Extend the allocation without changing the data size.
407 *
408 * Note we ensure the allocation is big enough to at least
409 * write some data but we do not require the allocation to be
410 * complete, i.e. it may be partial.
411 */
412 ll = ntfs_attr_extend_allocation(ni, end, -1, pos);
413 if (likely(ll >= 0)) {
414 BUG_ON(pos >= ll);
415 /* If the extension was partial truncate the write. */
416 if (end > ll) {
417 ntfs_debug("Truncating write to inode 0x%lx, "
418 "attribute type 0x%x, because "
419 "the allocation was only "
420 "partially extended.",
421 vi->i_ino, (unsigned)
422 le32_to_cpu(ni->type));
Al Viroccca2682015-04-05 14:06:24 -0400423 iov_iter_truncate(from, ll - pos);
Anton Altaparmakova632f552015-03-11 10:43:32 -0400424 }
425 } else {
426 err = ll;
427 read_lock_irqsave(&ni->size_lock, flags);
428 ll = ni->allocated_size;
429 read_unlock_irqrestore(&ni->size_lock, flags);
430 /* Perform a partial write if possible or fail. */
431 if (pos < ll) {
432 ntfs_debug("Truncating write to inode 0x%lx "
433 "attribute type 0x%x, because "
434 "extending the allocation "
435 "failed (error %d).",
436 vi->i_ino, (unsigned)
437 le32_to_cpu(ni->type),
438 (int)-err);
Al Viroccca2682015-04-05 14:06:24 -0400439 iov_iter_truncate(from, ll - pos);
Anton Altaparmakova632f552015-03-11 10:43:32 -0400440 } else {
441 if (err != -ENOSPC)
442 ntfs_error(vi->i_sb, "Cannot perform "
443 "write to inode "
444 "0x%lx, attribute "
445 "type 0x%x, because "
446 "extending the "
447 "allocation failed "
448 "(error %ld).",
449 vi->i_ino, (unsigned)
450 le32_to_cpu(ni->type),
451 (long)-err);
452 else
453 ntfs_debug("Cannot perform write to "
454 "inode 0x%lx, "
455 "attribute type 0x%x, "
456 "because there is not "
457 "space left.",
458 vi->i_ino, (unsigned)
459 le32_to_cpu(ni->type));
460 goto out;
461 }
462 }
463 }
464 /*
465 * If the write starts beyond the initialized size, extend it up to the
466 * beginning of the write and initialize all non-sparse space between
467 * the old initialized size and the new one. This automatically also
468 * increments the vfs inode->i_size to keep it above or equal to the
469 * initialized_size.
470 */
471 read_lock_irqsave(&ni->size_lock, flags);
472 ll = ni->initialized_size;
473 read_unlock_irqrestore(&ni->size_lock, flags);
474 if (pos > ll) {
475 /*
476 * Wait for ongoing direct i/o to complete before proceeding.
477 * New direct i/o cannot start as we hold i_mutex.
478 */
479 inode_dio_wait(vi);
480 err = ntfs_attr_extend_initialized(ni, pos);
481 if (unlikely(err < 0))
482 ntfs_error(vi->i_sb, "Cannot perform write to inode "
483 "0x%lx, attribute type 0x%x, because "
484 "extending the initialized size "
485 "failed (error %d).", vi->i_ino,
486 (unsigned)le32_to_cpu(ni->type),
487 (int)-err);
488 }
489out:
490 return err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100491}
492
493/**
494 * __ntfs_grab_cache_pages - obtain a number of locked pages
495 * @mapping: address space mapping from which to obtain page cache pages
496 * @index: starting index in @mapping at which to begin obtaining pages
497 * @nr_pages: number of page cache pages to obtain
498 * @pages: array of pages in which to return the obtained page cache pages
499 * @cached_page: allocated but as yet unused page
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100500 *
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200501 * Obtain @nr_pages locked page cache pages from the mapping @mapping and
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100502 * starting at index @index.
503 *
Minchan Kim4c990002010-05-24 14:33:07 -0700504 * If a page is newly created, add it to lru list
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100505 *
506 * Note, the page locks are obtained in ascending page index order.
507 */
508static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
509 pgoff_t index, const unsigned nr_pages, struct page **pages,
Minchan Kim4c990002010-05-24 14:33:07 -0700510 struct page **cached_page)
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100511{
512 int err, nr;
513
514 BUG_ON(!nr_pages);
515 err = nr = 0;
516 do {
Anton Altaparmakov5272d032014-10-09 15:24:46 -0700517 pages[nr] = find_get_page_flags(mapping, index, FGP_LOCK |
518 FGP_ACCESSED);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100519 if (!pages[nr]) {
520 if (!*cached_page) {
521 *cached_page = page_cache_alloc(mapping);
522 if (unlikely(!*cached_page)) {
523 err = -ENOMEM;
524 goto err_out;
525 }
526 }
Anton Altaparmakova632f552015-03-11 10:43:32 -0400527 err = add_to_page_cache_lru(*cached_page, mapping,
Michal Hockoc62d2552015-11-06 16:28:49 -0800528 index,
529 mapping_gfp_constraint(mapping, GFP_KERNEL));
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100530 if (unlikely(err)) {
531 if (err == -EEXIST)
532 continue;
533 goto err_out;
534 }
535 pages[nr] = *cached_page;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100536 *cached_page = NULL;
537 }
538 index++;
539 nr++;
540 } while (nr < nr_pages);
541out:
542 return err;
543err_out:
544 while (nr > 0) {
545 unlock_page(pages[--nr]);
546 page_cache_release(pages[nr]);
547 }
548 goto out;
549}
550
551static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
552{
553 lock_buffer(bh);
554 get_bh(bh);
555 bh->b_end_io = end_buffer_read_sync;
556 return submit_bh(READ, bh);
557}
558
559/**
560 * ntfs_prepare_pages_for_non_resident_write - prepare pages for receiving data
561 * @pages: array of destination pages
562 * @nr_pages: number of pages in @pages
563 * @pos: byte position in file at which the write begins
564 * @bytes: number of bytes to be written
565 *
566 * This is called for non-resident attributes from ntfs_file_buffered_write()
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800567 * with i_mutex held on the inode (@pages[0]->mapping->host). There are
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100568 * @nr_pages pages in @pages which are locked but not kmap()ped. The source
569 * data has not yet been copied into the @pages.
570 *
571 * Need to fill any holes with actual clusters, allocate buffers if necessary,
572 * ensure all the buffers are mapped, and bring uptodate any buffers that are
573 * only partially being written to.
574 *
575 * If @nr_pages is greater than one, we are guaranteed that the cluster size is
576 * greater than PAGE_CACHE_SIZE, that all pages in @pages are entirely inside
577 * the same cluster and that they are the entirety of that cluster, and that
578 * the cluster is sparse, i.e. we need to allocate a cluster to fill the hole.
579 *
580 * i_size is not to be modified yet.
581 *
582 * Return 0 on success or -errno on error.
583 */
584static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
585 unsigned nr_pages, s64 pos, size_t bytes)
586{
587 VCN vcn, highest_vcn = 0, cpos, cend, bh_cpos, bh_cend;
588 LCN lcn;
589 s64 bh_pos, vcn_len, end, initialized_size;
590 sector_t lcn_block;
591 struct page *page;
592 struct inode *vi;
593 ntfs_inode *ni, *base_ni = NULL;
594 ntfs_volume *vol;
595 runlist_element *rl, *rl2;
596 struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
597 ntfs_attr_search_ctx *ctx = NULL;
598 MFT_RECORD *m = NULL;
599 ATTR_RECORD *a = NULL;
600 unsigned long flags;
601 u32 attr_rec_len = 0;
602 unsigned blocksize, u;
603 int err, mp_size;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700604 bool rl_write_locked, was_hole, is_retry;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100605 unsigned char blocksize_bits;
606 struct {
607 u8 runlist_merged:1;
608 u8 mft_attr_mapped:1;
609 u8 mp_rebuilt:1;
610 u8 attr_switched:1;
611 } status = { 0, 0, 0, 0 };
612
613 BUG_ON(!nr_pages);
614 BUG_ON(!pages);
615 BUG_ON(!*pages);
616 vi = pages[0]->mapping->host;
617 ni = NTFS_I(vi);
618 vol = ni->vol;
619 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +0100620 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100621 vi->i_ino, ni->type, pages[0]->index, nr_pages,
622 (long long)pos, bytes);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +0000623 blocksize = vol->sb->s_blocksize;
624 blocksize_bits = vol->sb->s_blocksize_bits;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100625 u = 0;
626 do {
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +0100627 page = pages[u];
628 BUG_ON(!page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100629 /*
630 * create_empty_buffers() will create uptodate/dirty buffers if
631 * the page is uptodate/dirty.
632 */
633 if (!page_has_buffers(page)) {
634 create_empty_buffers(page, blocksize, 0);
635 if (unlikely(!page_has_buffers(page)))
636 return -ENOMEM;
637 }
638 } while (++u < nr_pages);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700639 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100640 rl = NULL;
641 err = 0;
642 vcn = lcn = -1;
643 vcn_len = 0;
644 lcn_block = -1;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700645 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100646 cpos = pos >> vol->cluster_size_bits;
647 end = pos + bytes;
648 cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
649 /*
650 * Loop over each page and for each page over each buffer. Use goto to
651 * reduce indentation.
652 */
653 u = 0;
654do_next_page:
655 page = pages[u];
656 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
657 bh = head = page_buffers(page);
658 do {
659 VCN cdelta;
660 s64 bh_end;
661 unsigned bh_cofs;
662
663 /* Clear buffer_new on all buffers to reinitialise state. */
664 if (buffer_new(bh))
665 clear_buffer_new(bh);
666 bh_end = bh_pos + blocksize;
667 bh_cpos = bh_pos >> vol->cluster_size_bits;
668 bh_cofs = bh_pos & vol->cluster_size_mask;
669 if (buffer_mapped(bh)) {
670 /*
671 * The buffer is already mapped. If it is uptodate,
672 * ignore it.
673 */
674 if (buffer_uptodate(bh))
675 continue;
676 /*
677 * The buffer is not uptodate. If the page is uptodate
678 * set the buffer uptodate and otherwise ignore it.
679 */
680 if (PageUptodate(page)) {
681 set_buffer_uptodate(bh);
682 continue;
683 }
684 /*
685 * Neither the page nor the buffer are uptodate. If
686 * the buffer is only partially being written to, we
687 * need to read it in before the write, i.e. now.
688 */
689 if ((bh_pos < pos && bh_end > pos) ||
690 (bh_pos < end && bh_end > end)) {
691 /*
692 * If the buffer is fully or partially within
693 * the initialized size, do an actual read.
694 * Otherwise, simply zero the buffer.
695 */
696 read_lock_irqsave(&ni->size_lock, flags);
697 initialized_size = ni->initialized_size;
698 read_unlock_irqrestore(&ni->size_lock, flags);
699 if (bh_pos < initialized_size) {
700 ntfs_submit_bh_for_read(bh);
701 *wait_bh++ = bh;
702 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800703 zero_user(page, bh_offset(bh),
704 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100705 set_buffer_uptodate(bh);
706 }
707 }
708 continue;
709 }
710 /* Unmapped buffer. Need to map it. */
711 bh->b_bdev = vol->sb->s_bdev;
712 /*
713 * If the current buffer is in the same clusters as the map
714 * cache, there is no need to check the runlist again. The
715 * map cache is made up of @vcn, which is the first cached file
716 * cluster, @vcn_len which is the number of cached file
717 * clusters, @lcn is the device cluster corresponding to @vcn,
718 * and @lcn_block is the block number corresponding to @lcn.
719 */
720 cdelta = bh_cpos - vcn;
721 if (likely(!cdelta || (cdelta > 0 && cdelta < vcn_len))) {
722map_buffer_cached:
723 BUG_ON(lcn < 0);
724 bh->b_blocknr = lcn_block +
725 (cdelta << (vol->cluster_size_bits -
726 blocksize_bits)) +
727 (bh_cofs >> blocksize_bits);
728 set_buffer_mapped(bh);
729 /*
730 * If the page is uptodate so is the buffer. If the
731 * buffer is fully outside the write, we ignore it if
732 * it was already allocated and we mark it dirty so it
733 * gets written out if we allocated it. On the other
734 * hand, if we allocated the buffer but we are not
735 * marking it dirty we set buffer_new so we can do
736 * error recovery.
737 */
738 if (PageUptodate(page)) {
739 if (!buffer_uptodate(bh))
740 set_buffer_uptodate(bh);
741 if (unlikely(was_hole)) {
742 /* We allocated the buffer. */
743 unmap_underlying_metadata(bh->b_bdev,
744 bh->b_blocknr);
745 if (bh_end <= pos || bh_pos >= end)
746 mark_buffer_dirty(bh);
747 else
748 set_buffer_new(bh);
749 }
750 continue;
751 }
752 /* Page is _not_ uptodate. */
753 if (likely(!was_hole)) {
754 /*
755 * Buffer was already allocated. If it is not
756 * uptodate and is only partially being written
757 * to, we need to read it in before the write,
758 * i.e. now.
759 */
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000760 if (!buffer_uptodate(bh) && bh_pos < end &&
761 bh_end > pos &&
762 (bh_pos < pos ||
763 bh_end > end)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100764 /*
765 * If the buffer is fully or partially
766 * within the initialized size, do an
767 * actual read. Otherwise, simply zero
768 * the buffer.
769 */
770 read_lock_irqsave(&ni->size_lock,
771 flags);
772 initialized_size = ni->initialized_size;
773 read_unlock_irqrestore(&ni->size_lock,
774 flags);
775 if (bh_pos < initialized_size) {
776 ntfs_submit_bh_for_read(bh);
777 *wait_bh++ = bh;
778 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800779 zero_user(page, bh_offset(bh),
780 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100781 set_buffer_uptodate(bh);
782 }
783 }
784 continue;
785 }
786 /* We allocated the buffer. */
787 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
788 /*
789 * If the buffer is fully outside the write, zero it,
790 * set it uptodate, and mark it dirty so it gets
791 * written out. If it is partially being written to,
792 * zero region surrounding the write but leave it to
793 * commit write to do anything else. Finally, if the
794 * buffer is fully being overwritten, do nothing.
795 */
796 if (bh_end <= pos || bh_pos >= end) {
797 if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800798 zero_user(page, bh_offset(bh),
799 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100800 set_buffer_uptodate(bh);
801 }
802 mark_buffer_dirty(bh);
803 continue;
804 }
805 set_buffer_new(bh);
806 if (!buffer_uptodate(bh) &&
807 (bh_pos < pos || bh_end > end)) {
808 u8 *kaddr;
809 unsigned pofs;
810
Cong Wanga3ac1412011-11-25 23:14:34 +0800811 kaddr = kmap_atomic(page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100812 if (bh_pos < pos) {
813 pofs = bh_pos & ~PAGE_CACHE_MASK;
814 memset(kaddr + pofs, 0, pos - bh_pos);
815 }
816 if (bh_end > end) {
817 pofs = end & ~PAGE_CACHE_MASK;
818 memset(kaddr + pofs, 0, bh_end - end);
819 }
Cong Wanga3ac1412011-11-25 23:14:34 +0800820 kunmap_atomic(kaddr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100821 flush_dcache_page(page);
822 }
823 continue;
824 }
825 /*
826 * Slow path: this is the first buffer in the cluster. If it
827 * is outside allocated size and is not uptodate, zero it and
828 * set it uptodate.
829 */
830 read_lock_irqsave(&ni->size_lock, flags);
831 initialized_size = ni->allocated_size;
832 read_unlock_irqrestore(&ni->size_lock, flags);
833 if (bh_pos > initialized_size) {
834 if (PageUptodate(page)) {
835 if (!buffer_uptodate(bh))
836 set_buffer_uptodate(bh);
837 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800838 zero_user(page, bh_offset(bh), blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100839 set_buffer_uptodate(bh);
840 }
841 continue;
842 }
Richard Knutssonc49c3112006-09-30 23:27:12 -0700843 is_retry = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100844 if (!rl) {
845 down_read(&ni->runlist.lock);
846retry_remap:
847 rl = ni->runlist.rl;
848 }
849 if (likely(rl != NULL)) {
850 /* Seek to element containing target cluster. */
851 while (rl->length && rl[1].vcn <= bh_cpos)
852 rl++;
853 lcn = ntfs_rl_vcn_to_lcn(rl, bh_cpos);
854 if (likely(lcn >= 0)) {
855 /*
856 * Successful remap, setup the map cache and
857 * use that to deal with the buffer.
858 */
Richard Knutssonc49c3112006-09-30 23:27:12 -0700859 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100860 vcn = bh_cpos;
861 vcn_len = rl[1].vcn - vcn;
862 lcn_block = lcn << (vol->cluster_size_bits -
863 blocksize_bits);
Anton Altaparmakovd5aeaef2005-10-19 12:23:10 +0100864 cdelta = 0;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100865 /*
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000866 * If the number of remaining clusters touched
867 * by the write is smaller or equal to the
868 * number of cached clusters, unlock the
869 * runlist as the map cache will be used from
870 * now on.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100871 */
872 if (likely(vcn + vcn_len >= cend)) {
873 if (rl_write_locked) {
874 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700875 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100876 } else
877 up_read(&ni->runlist.lock);
878 rl = NULL;
879 }
880 goto map_buffer_cached;
881 }
882 } else
883 lcn = LCN_RL_NOT_MAPPED;
884 /*
885 * If it is not a hole and not out of bounds, the runlist is
886 * probably unmapped so try to map it now.
887 */
888 if (unlikely(lcn != LCN_HOLE && lcn != LCN_ENOENT)) {
889 if (likely(!is_retry && lcn == LCN_RL_NOT_MAPPED)) {
890 /* Attempt to map runlist. */
891 if (!rl_write_locked) {
892 /*
893 * We need the runlist locked for
894 * writing, so if it is locked for
895 * reading relock it now and retry in
896 * case it changed whilst we dropped
897 * the lock.
898 */
899 up_read(&ni->runlist.lock);
900 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700901 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100902 goto retry_remap;
903 }
904 err = ntfs_map_runlist_nolock(ni, bh_cpos,
905 NULL);
906 if (likely(!err)) {
Richard Knutssonc49c3112006-09-30 23:27:12 -0700907 is_retry = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100908 goto retry_remap;
909 }
910 /*
911 * If @vcn is out of bounds, pretend @lcn is
912 * LCN_ENOENT. As long as the buffer is out
913 * of bounds this will work fine.
914 */
915 if (err == -ENOENT) {
916 lcn = LCN_ENOENT;
917 err = 0;
918 goto rl_not_mapped_enoent;
919 }
920 } else
921 err = -EIO;
922 /* Failed to map the buffer, even after retrying. */
923 bh->b_blocknr = -1;
924 ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
925 "attribute type 0x%x, vcn 0x%llx, "
926 "vcn offset 0x%x, because its "
927 "location on disk could not be "
928 "determined%s (error code %i).",
929 ni->mft_no, ni->type,
930 (unsigned long long)bh_cpos,
931 (unsigned)bh_pos &
932 vol->cluster_size_mask,
933 is_retry ? " even after retrying" : "",
934 err);
935 break;
936 }
937rl_not_mapped_enoent:
938 /*
939 * The buffer is in a hole or out of bounds. We need to fill
940 * the hole, unless the buffer is in a cluster which is not
941 * touched by the write, in which case we just leave the buffer
942 * unmapped. This can only happen when the cluster size is
943 * less than the page cache size.
944 */
945 if (unlikely(vol->cluster_size < PAGE_CACHE_SIZE)) {
946 bh_cend = (bh_end + vol->cluster_size - 1) >>
947 vol->cluster_size_bits;
948 if ((bh_cend <= cpos || bh_cpos >= cend)) {
949 bh->b_blocknr = -1;
950 /*
951 * If the buffer is uptodate we skip it. If it
952 * is not but the page is uptodate, we can set
953 * the buffer uptodate. If the page is not
954 * uptodate, we can clear the buffer and set it
955 * uptodate. Whether this is worthwhile is
956 * debatable and this could be removed.
957 */
958 if (PageUptodate(page)) {
959 if (!buffer_uptodate(bh))
960 set_buffer_uptodate(bh);
961 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800962 zero_user(page, bh_offset(bh),
963 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100964 set_buffer_uptodate(bh);
965 }
966 continue;
967 }
968 }
969 /*
970 * Out of bounds buffer is invalid if it was not really out of
971 * bounds.
972 */
973 BUG_ON(lcn != LCN_HOLE);
974 /*
975 * We need the runlist locked for writing, so if it is locked
976 * for reading relock it now and retry in case it changed
977 * whilst we dropped the lock.
978 */
979 BUG_ON(!rl);
980 if (!rl_write_locked) {
981 up_read(&ni->runlist.lock);
982 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700983 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100984 goto retry_remap;
985 }
986 /* Find the previous last allocated cluster. */
987 BUG_ON(rl->lcn != LCN_HOLE);
988 lcn = -1;
989 rl2 = rl;
990 while (--rl2 >= ni->runlist.rl) {
991 if (rl2->lcn >= 0) {
992 lcn = rl2->lcn + rl2->length;
993 break;
994 }
995 }
996 rl2 = ntfs_cluster_alloc(vol, bh_cpos, 1, lcn, DATA_ZONE,
Richard Knutssonc49c3112006-09-30 23:27:12 -0700997 false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100998 if (IS_ERR(rl2)) {
999 err = PTR_ERR(rl2);
1000 ntfs_debug("Failed to allocate cluster, error code %i.",
1001 err);
1002 break;
1003 }
1004 lcn = rl2->lcn;
1005 rl = ntfs_runlists_merge(ni->runlist.rl, rl2);
1006 if (IS_ERR(rl)) {
1007 err = PTR_ERR(rl);
1008 if (err != -ENOMEM)
1009 err = -EIO;
1010 if (ntfs_cluster_free_from_rl(vol, rl2)) {
1011 ntfs_error(vol->sb, "Failed to release "
1012 "allocated cluster in error "
1013 "code path. Run chkdsk to "
1014 "recover the lost cluster.");
1015 NVolSetErrors(vol);
1016 }
1017 ntfs_free(rl2);
1018 break;
1019 }
1020 ni->runlist.rl = rl;
1021 status.runlist_merged = 1;
Anton Altaparmakovbb8047d2006-03-07 11:53:46 +00001022 ntfs_debug("Allocated cluster, lcn 0x%llx.",
1023 (unsigned long long)lcn);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001024 /* Map and lock the mft record and get the attribute record. */
1025 if (!NInoAttr(ni))
1026 base_ni = ni;
1027 else
1028 base_ni = ni->ext.base_ntfs_ino;
1029 m = map_mft_record(base_ni);
1030 if (IS_ERR(m)) {
1031 err = PTR_ERR(m);
1032 break;
1033 }
1034 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1035 if (unlikely(!ctx)) {
1036 err = -ENOMEM;
1037 unmap_mft_record(base_ni);
1038 break;
1039 }
1040 status.mft_attr_mapped = 1;
1041 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1042 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx);
1043 if (unlikely(err)) {
1044 if (err == -ENOENT)
1045 err = -EIO;
1046 break;
1047 }
1048 m = ctx->mrec;
1049 a = ctx->attr;
1050 /*
1051 * Find the runlist element with which the attribute extent
1052 * starts. Note, we cannot use the _attr_ version because we
1053 * have mapped the mft record. That is ok because we know the
1054 * runlist fragment must be mapped already to have ever gotten
1055 * here, so we can just use the _rl_ version.
1056 */
1057 vcn = sle64_to_cpu(a->data.non_resident.lowest_vcn);
1058 rl2 = ntfs_rl_find_vcn_nolock(rl, vcn);
1059 BUG_ON(!rl2);
1060 BUG_ON(!rl2->length);
1061 BUG_ON(rl2->lcn < LCN_HOLE);
1062 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
1063 /*
1064 * If @highest_vcn is zero, calculate the real highest_vcn
1065 * (which can really be zero).
1066 */
1067 if (!highest_vcn)
1068 highest_vcn = (sle64_to_cpu(
1069 a->data.non_resident.allocated_size) >>
1070 vol->cluster_size_bits) - 1;
1071 /*
1072 * Determine the size of the mapping pairs array for the new
1073 * extent, i.e. the old extent with the hole filled.
1074 */
1075 mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, vcn,
1076 highest_vcn);
1077 if (unlikely(mp_size <= 0)) {
1078 if (!(err = mp_size))
1079 err = -EIO;
1080 ntfs_debug("Failed to get size for mapping pairs "
1081 "array, error code %i.", err);
1082 break;
1083 }
1084 /*
1085 * Resize the attribute record to fit the new mapping pairs
1086 * array.
1087 */
1088 attr_rec_len = le32_to_cpu(a->length);
1089 err = ntfs_attr_record_resize(m, a, mp_size + le16_to_cpu(
1090 a->data.non_resident.mapping_pairs_offset));
1091 if (unlikely(err)) {
1092 BUG_ON(err != -ENOSPC);
1093 // TODO: Deal with this by using the current attribute
1094 // and fill it with as much of the mapping pairs
1095 // array as possible. Then loop over each attribute
1096 // extent rewriting the mapping pairs arrays as we go
1097 // along and if when we reach the end we have not
1098 // enough space, try to resize the last attribute
1099 // extent and if even that fails, add a new attribute
1100 // extent.
1101 // We could also try to resize at each step in the hope
1102 // that we will not need to rewrite every single extent.
1103 // Note, we may need to decompress some extents to fill
1104 // the runlist as we are walking the extents...
1105 ntfs_error(vol->sb, "Not enough space in the mft "
1106 "record for the extended attribute "
1107 "record. This case is not "
1108 "implemented yet.");
1109 err = -EOPNOTSUPP;
1110 break ;
1111 }
1112 status.mp_rebuilt = 1;
1113 /*
1114 * Generate the mapping pairs array directly into the attribute
1115 * record.
1116 */
1117 err = ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
1118 a->data.non_resident.mapping_pairs_offset),
1119 mp_size, rl2, vcn, highest_vcn, NULL);
1120 if (unlikely(err)) {
1121 ntfs_error(vol->sb, "Cannot fill hole in inode 0x%lx, "
1122 "attribute type 0x%x, because building "
1123 "the mapping pairs failed with error "
1124 "code %i.", vi->i_ino,
1125 (unsigned)le32_to_cpu(ni->type), err);
1126 err = -EIO;
1127 break;
1128 }
1129 /* Update the highest_vcn but only if it was not set. */
1130 if (unlikely(!a->data.non_resident.highest_vcn))
1131 a->data.non_resident.highest_vcn =
1132 cpu_to_sle64(highest_vcn);
1133 /*
1134 * If the attribute is sparse/compressed, update the compressed
1135 * size in the ntfs_inode structure and the attribute record.
1136 */
1137 if (likely(NInoSparse(ni) || NInoCompressed(ni))) {
1138 /*
1139 * If we are not in the first attribute extent, switch
1140 * to it, but first ensure the changes will make it to
1141 * disk later.
1142 */
1143 if (a->data.non_resident.lowest_vcn) {
1144 flush_dcache_mft_record_page(ctx->ntfs_ino);
1145 mark_mft_record_dirty(ctx->ntfs_ino);
1146 ntfs_attr_reinit_search_ctx(ctx);
1147 err = ntfs_attr_lookup(ni->type, ni->name,
1148 ni->name_len, CASE_SENSITIVE,
1149 0, NULL, 0, ctx);
1150 if (unlikely(err)) {
1151 status.attr_switched = 1;
1152 break;
1153 }
1154 /* @m is not used any more so do not set it. */
1155 a = ctx->attr;
1156 }
1157 write_lock_irqsave(&ni->size_lock, flags);
1158 ni->itype.compressed.size += vol->cluster_size;
1159 a->data.non_resident.compressed_size =
1160 cpu_to_sle64(ni->itype.compressed.size);
1161 write_unlock_irqrestore(&ni->size_lock, flags);
1162 }
1163 /* Ensure the changes make it to disk. */
1164 flush_dcache_mft_record_page(ctx->ntfs_ino);
1165 mark_mft_record_dirty(ctx->ntfs_ino);
1166 ntfs_attr_put_search_ctx(ctx);
1167 unmap_mft_record(base_ni);
1168 /* Successfully filled the hole. */
1169 status.runlist_merged = 0;
1170 status.mft_attr_mapped = 0;
1171 status.mp_rebuilt = 0;
1172 /* Setup the map cache and use that to deal with the buffer. */
Richard Knutssonc49c3112006-09-30 23:27:12 -07001173 was_hole = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001174 vcn = bh_cpos;
1175 vcn_len = 1;
1176 lcn_block = lcn << (vol->cluster_size_bits - blocksize_bits);
1177 cdelta = 0;
1178 /*
1179 * If the number of remaining clusters in the @pages is smaller
1180 * or equal to the number of cached clusters, unlock the
1181 * runlist as the map cache will be used from now on.
1182 */
1183 if (likely(vcn + vcn_len >= cend)) {
1184 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001185 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001186 rl = NULL;
1187 }
1188 goto map_buffer_cached;
1189 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1190 /* If there are no errors, do the next page. */
1191 if (likely(!err && ++u < nr_pages))
1192 goto do_next_page;
1193 /* If there are no errors, release the runlist lock if we took it. */
1194 if (likely(!err)) {
1195 if (unlikely(rl_write_locked)) {
1196 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001197 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001198 } else if (unlikely(rl))
1199 up_read(&ni->runlist.lock);
1200 rl = NULL;
1201 }
1202 /* If we issued read requests, let them complete. */
1203 read_lock_irqsave(&ni->size_lock, flags);
1204 initialized_size = ni->initialized_size;
1205 read_unlock_irqrestore(&ni->size_lock, flags);
1206 while (wait_bh > wait) {
1207 bh = *--wait_bh;
1208 wait_on_buffer(bh);
1209 if (likely(buffer_uptodate(bh))) {
1210 page = bh->b_page;
1211 bh_pos = ((s64)page->index << PAGE_CACHE_SHIFT) +
1212 bh_offset(bh);
1213 /*
1214 * If the buffer overflows the initialized size, need
1215 * to zero the overflowing region.
1216 */
1217 if (unlikely(bh_pos + blocksize > initialized_size)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001218 int ofs = 0;
1219
1220 if (likely(bh_pos < initialized_size))
1221 ofs = initialized_size - bh_pos;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001222 zero_user_segment(page, bh_offset(bh) + ofs,
1223 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001224 }
1225 } else /* if (unlikely(!buffer_uptodate(bh))) */
1226 err = -EIO;
1227 }
1228 if (likely(!err)) {
1229 /* Clear buffer_new on all buffers. */
1230 u = 0;
1231 do {
1232 bh = head = page_buffers(pages[u]);
1233 do {
1234 if (buffer_new(bh))
1235 clear_buffer_new(bh);
1236 } while ((bh = bh->b_this_page) != head);
1237 } while (++u < nr_pages);
1238 ntfs_debug("Done.");
1239 return err;
1240 }
1241 if (status.attr_switched) {
1242 /* Get back to the attribute extent we modified. */
1243 ntfs_attr_reinit_search_ctx(ctx);
1244 if (ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1245 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx)) {
1246 ntfs_error(vol->sb, "Failed to find required "
1247 "attribute extent of attribute in "
1248 "error code path. Run chkdsk to "
1249 "recover.");
1250 write_lock_irqsave(&ni->size_lock, flags);
1251 ni->itype.compressed.size += vol->cluster_size;
1252 write_unlock_irqrestore(&ni->size_lock, flags);
1253 flush_dcache_mft_record_page(ctx->ntfs_ino);
1254 mark_mft_record_dirty(ctx->ntfs_ino);
1255 /*
1256 * The only thing that is now wrong is the compressed
1257 * size of the base attribute extent which chkdsk
1258 * should be able to fix.
1259 */
1260 NVolSetErrors(vol);
1261 } else {
1262 m = ctx->mrec;
1263 a = ctx->attr;
1264 status.attr_switched = 0;
1265 }
1266 }
1267 /*
1268 * If the runlist has been modified, need to restore it by punching a
1269 * hole into it and we then need to deallocate the on-disk cluster as
1270 * well. Note, we only modify the runlist if we are able to generate a
1271 * new mapping pairs array, i.e. only when the mapped attribute extent
1272 * is not switched.
1273 */
1274 if (status.runlist_merged && !status.attr_switched) {
1275 BUG_ON(!rl_write_locked);
1276 /* Make the file cluster we allocated sparse in the runlist. */
1277 if (ntfs_rl_punch_nolock(vol, &ni->runlist, bh_cpos, 1)) {
1278 ntfs_error(vol->sb, "Failed to punch hole into "
1279 "attribute runlist in error code "
1280 "path. Run chkdsk to recover the "
1281 "lost cluster.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001282 NVolSetErrors(vol);
1283 } else /* if (success) */ {
1284 status.runlist_merged = 0;
1285 /*
1286 * Deallocate the on-disk cluster we allocated but only
1287 * if we succeeded in punching its vcn out of the
1288 * runlist.
1289 */
1290 down_write(&vol->lcnbmp_lock);
1291 if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
1292 ntfs_error(vol->sb, "Failed to release "
1293 "allocated cluster in error "
1294 "code path. Run chkdsk to "
1295 "recover the lost cluster.");
1296 NVolSetErrors(vol);
1297 }
1298 up_write(&vol->lcnbmp_lock);
1299 }
1300 }
1301 /*
1302 * Resize the attribute record to its old size and rebuild the mapping
1303 * pairs array. Note, we only can do this if the runlist has been
1304 * restored to its old state which also implies that the mapped
1305 * attribute extent is not switched.
1306 */
1307 if (status.mp_rebuilt && !status.runlist_merged) {
1308 if (ntfs_attr_record_resize(m, a, attr_rec_len)) {
1309 ntfs_error(vol->sb, "Failed to restore attribute "
1310 "record in error code path. Run "
1311 "chkdsk to recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001312 NVolSetErrors(vol);
1313 } else /* if (success) */ {
1314 if (ntfs_mapping_pairs_build(vol, (u8*)a +
1315 le16_to_cpu(a->data.non_resident.
1316 mapping_pairs_offset), attr_rec_len -
1317 le16_to_cpu(a->data.non_resident.
1318 mapping_pairs_offset), ni->runlist.rl,
1319 vcn, highest_vcn, NULL)) {
1320 ntfs_error(vol->sb, "Failed to restore "
1321 "mapping pairs array in error "
1322 "code path. Run chkdsk to "
1323 "recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001324 NVolSetErrors(vol);
1325 }
1326 flush_dcache_mft_record_page(ctx->ntfs_ino);
1327 mark_mft_record_dirty(ctx->ntfs_ino);
1328 }
1329 }
1330 /* Release the mft record and the attribute. */
1331 if (status.mft_attr_mapped) {
1332 ntfs_attr_put_search_ctx(ctx);
1333 unmap_mft_record(base_ni);
1334 }
1335 /* Release the runlist lock. */
1336 if (rl_write_locked)
1337 up_write(&ni->runlist.lock);
1338 else if (rl)
1339 up_read(&ni->runlist.lock);
1340 /*
1341 * Zero out any newly allocated blocks to avoid exposing stale data.
1342 * If BH_New is set, we know that the block was newly allocated above
1343 * and that it has not been fully zeroed and marked dirty yet.
1344 */
1345 nr_pages = u;
1346 u = 0;
1347 end = bh_cpos << vol->cluster_size_bits;
1348 do {
1349 page = pages[u];
1350 bh = head = page_buffers(page);
1351 do {
1352 if (u == nr_pages &&
1353 ((s64)page->index << PAGE_CACHE_SHIFT) +
1354 bh_offset(bh) >= end)
1355 break;
1356 if (!buffer_new(bh))
1357 continue;
1358 clear_buffer_new(bh);
1359 if (!buffer_uptodate(bh)) {
1360 if (PageUptodate(page))
1361 set_buffer_uptodate(bh);
1362 else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001363 zero_user(page, bh_offset(bh),
1364 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001365 set_buffer_uptodate(bh);
1366 }
1367 }
1368 mark_buffer_dirty(bh);
1369 } while ((bh = bh->b_this_page) != head);
1370 } while (++u <= nr_pages);
1371 ntfs_error(vol->sb, "Failed. Returning error code %i.", err);
1372 return err;
1373}
1374
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001375static inline void ntfs_flush_dcache_pages(struct page **pages,
1376 unsigned nr_pages)
1377{
1378 BUG_ON(!nr_pages);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001379 /*
1380 * Warning: Do not do the decrement at the same time as the call to
1381 * flush_dcache_page() because it is a NULL macro on i386 and hence the
1382 * decrement never happens so the loop never terminates.
1383 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001384 do {
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001385 --nr_pages;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001386 flush_dcache_page(pages[nr_pages]);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001387 } while (nr_pages > 0);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001388}
1389
1390/**
1391 * ntfs_commit_pages_after_non_resident_write - commit the received data
1392 * @pages: array of destination pages
1393 * @nr_pages: number of pages in @pages
1394 * @pos: byte position in file at which the write begins
1395 * @bytes: number of bytes to be written
1396 *
1397 * See description of ntfs_commit_pages_after_write(), below.
1398 */
1399static inline int ntfs_commit_pages_after_non_resident_write(
1400 struct page **pages, const unsigned nr_pages,
1401 s64 pos, size_t bytes)
1402{
1403 s64 end, initialized_size;
1404 struct inode *vi;
1405 ntfs_inode *ni, *base_ni;
1406 struct buffer_head *bh, *head;
1407 ntfs_attr_search_ctx *ctx;
1408 MFT_RECORD *m;
1409 ATTR_RECORD *a;
1410 unsigned long flags;
1411 unsigned blocksize, u;
1412 int err;
1413
1414 vi = pages[0]->mapping->host;
1415 ni = NTFS_I(vi);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +00001416 blocksize = vi->i_sb->s_blocksize;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001417 end = pos + bytes;
1418 u = 0;
1419 do {
1420 s64 bh_pos;
1421 struct page *page;
Richard Knutssonc49c3112006-09-30 23:27:12 -07001422 bool partial;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001423
1424 page = pages[u];
1425 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
1426 bh = head = page_buffers(page);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001427 partial = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001428 do {
1429 s64 bh_end;
1430
1431 bh_end = bh_pos + blocksize;
1432 if (bh_end <= pos || bh_pos >= end) {
1433 if (!buffer_uptodate(bh))
Richard Knutssonc49c3112006-09-30 23:27:12 -07001434 partial = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001435 } else {
1436 set_buffer_uptodate(bh);
1437 mark_buffer_dirty(bh);
1438 }
1439 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1440 /*
1441 * If all buffers are now uptodate but the page is not, set the
1442 * page uptodate.
1443 */
1444 if (!partial && !PageUptodate(page))
1445 SetPageUptodate(page);
1446 } while (++u < nr_pages);
1447 /*
1448 * Finally, if we do not need to update initialized_size or i_size we
1449 * are finished.
1450 */
1451 read_lock_irqsave(&ni->size_lock, flags);
1452 initialized_size = ni->initialized_size;
1453 read_unlock_irqrestore(&ni->size_lock, flags);
1454 if (end <= initialized_size) {
1455 ntfs_debug("Done.");
1456 return 0;
1457 }
1458 /*
1459 * Update initialized_size/i_size as appropriate, both in the inode and
1460 * the mft record.
1461 */
1462 if (!NInoAttr(ni))
1463 base_ni = ni;
1464 else
1465 base_ni = ni->ext.base_ntfs_ino;
1466 /* Map, pin, and lock the mft record. */
1467 m = map_mft_record(base_ni);
1468 if (IS_ERR(m)) {
1469 err = PTR_ERR(m);
1470 m = NULL;
1471 ctx = NULL;
1472 goto err_out;
1473 }
1474 BUG_ON(!NInoNonResident(ni));
1475 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1476 if (unlikely(!ctx)) {
1477 err = -ENOMEM;
1478 goto err_out;
1479 }
1480 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1481 CASE_SENSITIVE, 0, NULL, 0, ctx);
1482 if (unlikely(err)) {
1483 if (err == -ENOENT)
1484 err = -EIO;
1485 goto err_out;
1486 }
1487 a = ctx->attr;
1488 BUG_ON(!a->non_resident);
1489 write_lock_irqsave(&ni->size_lock, flags);
1490 BUG_ON(end > ni->allocated_size);
1491 ni->initialized_size = end;
1492 a->data.non_resident.initialized_size = cpu_to_sle64(end);
1493 if (end > i_size_read(vi)) {
1494 i_size_write(vi, end);
1495 a->data.non_resident.data_size =
1496 a->data.non_resident.initialized_size;
1497 }
1498 write_unlock_irqrestore(&ni->size_lock, flags);
1499 /* Mark the mft record dirty, so it gets written back. */
1500 flush_dcache_mft_record_page(ctx->ntfs_ino);
1501 mark_mft_record_dirty(ctx->ntfs_ino);
1502 ntfs_attr_put_search_ctx(ctx);
1503 unmap_mft_record(base_ni);
1504 ntfs_debug("Done.");
1505 return 0;
1506err_out:
1507 if (ctx)
1508 ntfs_attr_put_search_ctx(ctx);
1509 if (m)
1510 unmap_mft_record(base_ni);
1511 ntfs_error(vi->i_sb, "Failed to update initialized_size/i_size (error "
1512 "code %i).", err);
Anton Altaparmakovf95c4012006-03-23 15:59:32 +00001513 if (err != -ENOMEM)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001514 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001515 return err;
1516}
1517
1518/**
1519 * ntfs_commit_pages_after_write - commit the received data
1520 * @pages: array of destination pages
1521 * @nr_pages: number of pages in @pages
1522 * @pos: byte position in file at which the write begins
1523 * @bytes: number of bytes to be written
1524 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001525 * This is called from ntfs_file_buffered_write() with i_mutex held on the inode
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001526 * (@pages[0]->mapping->host). There are @nr_pages pages in @pages which are
1527 * locked but not kmap()ped. The source data has already been copied into the
1528 * @page. ntfs_prepare_pages_for_non_resident_write() has been called before
1529 * the data was copied (for non-resident attributes only) and it returned
1530 * success.
1531 *
1532 * Need to set uptodate and mark dirty all buffers within the boundary of the
1533 * write. If all buffers in a page are uptodate we set the page uptodate, too.
1534 *
1535 * Setting the buffers dirty ensures that they get written out later when
1536 * ntfs_writepage() is invoked by the VM.
1537 *
1538 * Finally, we need to update i_size and initialized_size as appropriate both
1539 * in the inode and the mft record.
1540 *
1541 * This is modelled after fs/buffer.c::generic_commit_write(), which marks
1542 * buffers uptodate and dirty, sets the page uptodate if all buffers in the
1543 * page are uptodate, and updates i_size if the end of io is beyond i_size. In
1544 * that case, it also marks the inode dirty.
1545 *
1546 * If things have gone as outlined in
1547 * ntfs_prepare_pages_for_non_resident_write(), we do not need to do any page
1548 * content modifications here for non-resident attributes. For resident
1549 * attributes we need to do the uptodate bringing here which we combine with
1550 * the copying into the mft record which means we save one atomic kmap.
1551 *
1552 * Return 0 on success or -errno on error.
1553 */
1554static int ntfs_commit_pages_after_write(struct page **pages,
1555 const unsigned nr_pages, s64 pos, size_t bytes)
1556{
1557 s64 end, initialized_size;
1558 loff_t i_size;
1559 struct inode *vi;
1560 ntfs_inode *ni, *base_ni;
1561 struct page *page;
1562 ntfs_attr_search_ctx *ctx;
1563 MFT_RECORD *m;
1564 ATTR_RECORD *a;
1565 char *kattr, *kaddr;
1566 unsigned long flags;
1567 u32 attr_len;
1568 int err;
1569
1570 BUG_ON(!nr_pages);
1571 BUG_ON(!pages);
1572 page = pages[0];
1573 BUG_ON(!page);
1574 vi = page->mapping->host;
1575 ni = NTFS_I(vi);
1576 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +01001577 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001578 vi->i_ino, ni->type, page->index, nr_pages,
1579 (long long)pos, bytes);
1580 if (NInoNonResident(ni))
1581 return ntfs_commit_pages_after_non_resident_write(pages,
1582 nr_pages, pos, bytes);
1583 BUG_ON(nr_pages > 1);
1584 /*
1585 * Attribute is resident, implying it is not compressed, encrypted, or
1586 * sparse.
1587 */
1588 if (!NInoAttr(ni))
1589 base_ni = ni;
1590 else
1591 base_ni = ni->ext.base_ntfs_ino;
1592 BUG_ON(NInoNonResident(ni));
1593 /* Map, pin, and lock the mft record. */
1594 m = map_mft_record(base_ni);
1595 if (IS_ERR(m)) {
1596 err = PTR_ERR(m);
1597 m = NULL;
1598 ctx = NULL;
1599 goto err_out;
1600 }
1601 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1602 if (unlikely(!ctx)) {
1603 err = -ENOMEM;
1604 goto err_out;
1605 }
1606 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1607 CASE_SENSITIVE, 0, NULL, 0, ctx);
1608 if (unlikely(err)) {
1609 if (err == -ENOENT)
1610 err = -EIO;
1611 goto err_out;
1612 }
1613 a = ctx->attr;
1614 BUG_ON(a->non_resident);
1615 /* The total length of the attribute value. */
1616 attr_len = le32_to_cpu(a->data.resident.value_length);
1617 i_size = i_size_read(vi);
1618 BUG_ON(attr_len != i_size);
1619 BUG_ON(pos > attr_len);
1620 end = pos + bytes;
1621 BUG_ON(end > le32_to_cpu(a->length) -
1622 le16_to_cpu(a->data.resident.value_offset));
1623 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
Cong Wanga3ac1412011-11-25 23:14:34 +08001624 kaddr = kmap_atomic(page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001625 /* Copy the received data from the page to the mft record. */
1626 memcpy(kattr + pos, kaddr + pos, bytes);
1627 /* Update the attribute length if necessary. */
1628 if (end > attr_len) {
1629 attr_len = end;
1630 a->data.resident.value_length = cpu_to_le32(attr_len);
1631 }
1632 /*
1633 * If the page is not uptodate, bring the out of bounds area(s)
1634 * uptodate by copying data from the mft record to the page.
1635 */
1636 if (!PageUptodate(page)) {
1637 if (pos > 0)
1638 memcpy(kaddr, kattr, pos);
1639 if (end < attr_len)
1640 memcpy(kaddr + end, kattr + end, attr_len - end);
1641 /* Zero the region outside the end of the attribute value. */
1642 memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
1643 flush_dcache_page(page);
1644 SetPageUptodate(page);
1645 }
Cong Wanga3ac1412011-11-25 23:14:34 +08001646 kunmap_atomic(kaddr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001647 /* Update initialized_size/i_size if necessary. */
1648 read_lock_irqsave(&ni->size_lock, flags);
1649 initialized_size = ni->initialized_size;
1650 BUG_ON(end > ni->allocated_size);
1651 read_unlock_irqrestore(&ni->size_lock, flags);
1652 BUG_ON(initialized_size != i_size);
1653 if (end > initialized_size) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001654 write_lock_irqsave(&ni->size_lock, flags);
1655 ni->initialized_size = end;
1656 i_size_write(vi, end);
1657 write_unlock_irqrestore(&ni->size_lock, flags);
1658 }
1659 /* Mark the mft record dirty, so it gets written back. */
1660 flush_dcache_mft_record_page(ctx->ntfs_ino);
1661 mark_mft_record_dirty(ctx->ntfs_ino);
1662 ntfs_attr_put_search_ctx(ctx);
1663 unmap_mft_record(base_ni);
1664 ntfs_debug("Done.");
1665 return 0;
1666err_out:
1667 if (err == -ENOMEM) {
1668 ntfs_warning(vi->i_sb, "Error allocating memory required to "
1669 "commit the write.");
1670 if (PageUptodate(page)) {
1671 ntfs_warning(vi->i_sb, "Page is uptodate, setting "
1672 "dirty so the write will be retried "
1673 "later on by the VM.");
1674 /*
1675 * Put the page on mapping->dirty_pages, but leave its
1676 * buffers' dirty state as-is.
1677 */
1678 __set_page_dirty_nobuffers(page);
1679 err = 0;
1680 } else
1681 ntfs_error(vi->i_sb, "Page is not uptodate. Written "
1682 "data has been lost.");
1683 } else {
1684 ntfs_error(vi->i_sb, "Resident attribute commit write failed "
1685 "with error %i.", err);
1686 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001687 }
1688 if (ctx)
1689 ntfs_attr_put_search_ctx(ctx);
1690 if (m)
1691 unmap_mft_record(base_ni);
1692 return err;
1693}
1694
Anton Altaparmakova632f552015-03-11 10:43:32 -04001695/*
1696 * Copy as much as we can into the pages and return the number of bytes which
1697 * were successfully copied. If a fault is encountered then clear the pages
1698 * out to (ofs + bytes) and return the number of bytes which were copied.
1699 */
1700static size_t ntfs_copy_from_user_iter(struct page **pages, unsigned nr_pages,
1701 unsigned ofs, struct iov_iter *i, size_t bytes)
Marco Stornelli9014da72012-12-15 11:58:36 +01001702{
Anton Altaparmakova632f552015-03-11 10:43:32 -04001703 struct page **last_page = pages + nr_pages;
1704 size_t total = 0;
1705 struct iov_iter data = *i;
1706 unsigned len, copied;
Marco Stornelli9014da72012-12-15 11:58:36 +01001707
Anton Altaparmakova632f552015-03-11 10:43:32 -04001708 do {
1709 len = PAGE_CACHE_SIZE - ofs;
1710 if (len > bytes)
1711 len = bytes;
1712 copied = iov_iter_copy_from_user_atomic(*pages, &data, ofs,
1713 len);
1714 total += copied;
1715 bytes -= copied;
1716 if (!bytes)
1717 break;
1718 iov_iter_advance(&data, copied);
1719 if (copied < len)
1720 goto err;
1721 ofs = 0;
1722 } while (++pages < last_page);
1723out:
1724 return total;
1725err:
1726 /* Zero the rest of the target like __copy_from_user(). */
1727 len = PAGE_CACHE_SIZE - copied;
1728 do {
1729 if (len > bytes)
1730 len = bytes;
1731 zero_user(*pages, copied, len);
1732 bytes -= len;
1733 copied = 0;
1734 len = PAGE_CACHE_SIZE;
1735 } while (++pages < last_page);
1736 goto out;
Marco Stornelli9014da72012-12-15 11:58:36 +01001737}
1738
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001739/**
Anton Altaparmakova632f552015-03-11 10:43:32 -04001740 * ntfs_perform_write - perform buffered write to a file
1741 * @file: file to write to
1742 * @i: iov_iter with data to write
1743 * @pos: byte offset in file at which to begin writing to
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001744 */
Anton Altaparmakova632f552015-03-11 10:43:32 -04001745static ssize_t ntfs_perform_write(struct file *file, struct iov_iter *i,
1746 loff_t pos)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001747{
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001748 struct address_space *mapping = file->f_mapping;
1749 struct inode *vi = mapping->host;
1750 ntfs_inode *ni = NTFS_I(vi);
1751 ntfs_volume *vol = ni->vol;
1752 struct page *pages[NTFS_MAX_PAGES_PER_CLUSTER];
1753 struct page *cached_page = NULL;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001754 VCN last_vcn;
1755 LCN lcn;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001756 size_t bytes;
1757 ssize_t status, written = 0;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001758 unsigned nr_pages;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001759
Anton Altaparmakova632f552015-03-11 10:43:32 -04001760 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, pos "
1761 "0x%llx, count 0x%lx.", vi->i_ino,
1762 (unsigned)le32_to_cpu(ni->type),
1763 (unsigned long long)pos,
1764 (unsigned long)iov_iter_count(i));
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001765 /*
1766 * If a previous ntfs_truncate() failed, repeat it and abort if it
1767 * fails again.
1768 */
1769 if (unlikely(NInoTruncateFailed(ni))) {
Anton Altaparmakova632f552015-03-11 10:43:32 -04001770 int err;
1771
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -04001772 inode_dio_wait(vi);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001773 err = ntfs_truncate(vi);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001774 if (err || NInoTruncateFailed(ni)) {
1775 if (!err)
1776 err = -EIO;
1777 ntfs_error(vol->sb, "Cannot perform write to inode "
1778 "0x%lx, attribute type 0x%x, because "
1779 "ntfs_truncate() failed (error code "
1780 "%i).", vi->i_ino,
1781 (unsigned)le32_to_cpu(ni->type), err);
1782 return err;
1783 }
1784 }
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001785 /*
1786 * Determine the number of pages per cluster for non-resident
1787 * attributes.
1788 */
1789 nr_pages = 1;
1790 if (vol->cluster_size > PAGE_CACHE_SIZE && NInoNonResident(ni))
1791 nr_pages = vol->cluster_size >> PAGE_CACHE_SHIFT;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001792 last_vcn = -1;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001793 do {
1794 VCN vcn;
1795 pgoff_t idx, start_idx;
1796 unsigned ofs, do_pages, u;
1797 size_t copied;
1798
1799 start_idx = idx = pos >> PAGE_CACHE_SHIFT;
1800 ofs = pos & ~PAGE_CACHE_MASK;
1801 bytes = PAGE_CACHE_SIZE - ofs;
1802 do_pages = 1;
1803 if (nr_pages > 1) {
1804 vcn = pos >> vol->cluster_size_bits;
1805 if (vcn != last_vcn) {
1806 last_vcn = vcn;
1807 /*
1808 * Get the lcn of the vcn the write is in. If
1809 * it is a hole, need to lock down all pages in
1810 * the cluster.
1811 */
1812 down_read(&ni->runlist.lock);
1813 lcn = ntfs_attr_vcn_to_lcn_nolock(ni, pos >>
Richard Knutssonc49c3112006-09-30 23:27:12 -07001814 vol->cluster_size_bits, false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001815 up_read(&ni->runlist.lock);
1816 if (unlikely(lcn < LCN_HOLE)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001817 if (lcn == LCN_ENOMEM)
1818 status = -ENOMEM;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001819 else {
1820 status = -EIO;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001821 ntfs_error(vol->sb, "Cannot "
1822 "perform write to "
1823 "inode 0x%lx, "
1824 "attribute type 0x%x, "
1825 "because the attribute "
1826 "is corrupt.",
1827 vi->i_ino, (unsigned)
1828 le32_to_cpu(ni->type));
Anton Altaparmakova632f552015-03-11 10:43:32 -04001829 }
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001830 break;
1831 }
1832 if (lcn == LCN_HOLE) {
1833 start_idx = (pos & ~(s64)
1834 vol->cluster_size_mask)
1835 >> PAGE_CACHE_SHIFT;
1836 bytes = vol->cluster_size - (pos &
1837 vol->cluster_size_mask);
1838 do_pages = nr_pages;
1839 }
1840 }
1841 }
Anton Altaparmakova632f552015-03-11 10:43:32 -04001842 if (bytes > iov_iter_count(i))
1843 bytes = iov_iter_count(i);
1844again:
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001845 /*
1846 * Bring in the user page(s) that we will copy from _first_.
1847 * Otherwise there is a nasty deadlock on copying from the same
1848 * page(s) as we are writing to, without it/them being marked
1849 * up-to-date. Note, at present there is nothing to stop the
1850 * pages being swapped out between us bringing them into memory
1851 * and doing the actual copying.
1852 */
Anton Altaparmakova632f552015-03-11 10:43:32 -04001853 if (unlikely(iov_iter_fault_in_multipages_readable(i, bytes))) {
1854 status = -EFAULT;
1855 break;
1856 }
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001857 /* Get and lock @do_pages starting at index @start_idx. */
1858 status = __ntfs_grab_cache_pages(mapping, start_idx, do_pages,
Minchan Kim4c990002010-05-24 14:33:07 -07001859 pages, &cached_page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001860 if (unlikely(status))
1861 break;
1862 /*
1863 * For non-resident attributes, we need to fill any holes with
1864 * actual clusters and ensure all bufferes are mapped. We also
1865 * need to bring uptodate any buffers that are only partially
1866 * being written to.
1867 */
1868 if (NInoNonResident(ni)) {
1869 status = ntfs_prepare_pages_for_non_resident_write(
1870 pages, do_pages, pos, bytes);
1871 if (unlikely(status)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001872 do {
1873 unlock_page(pages[--do_pages]);
1874 page_cache_release(pages[do_pages]);
1875 } while (do_pages);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001876 break;
1877 }
1878 }
1879 u = (pos >> PAGE_CACHE_SHIFT) - pages[0]->index;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001880 copied = ntfs_copy_from_user_iter(pages + u, do_pages - u, ofs,
1881 i, bytes);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001882 ntfs_flush_dcache_pages(pages + u, do_pages - u);
Anton Altaparmakova632f552015-03-11 10:43:32 -04001883 status = 0;
1884 if (likely(copied == bytes)) {
1885 status = ntfs_commit_pages_after_write(pages, do_pages,
1886 pos, bytes);
1887 if (!status)
1888 status = bytes;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001889 }
1890 do {
1891 unlock_page(pages[--do_pages]);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001892 page_cache_release(pages[do_pages]);
1893 } while (do_pages);
Anton Altaparmakova632f552015-03-11 10:43:32 -04001894 if (unlikely(status < 0))
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001895 break;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001896 copied = status;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001897 cond_resched();
Anton Altaparmakova632f552015-03-11 10:43:32 -04001898 if (unlikely(!copied)) {
1899 size_t sc;
1900
1901 /*
1902 * We failed to copy anything. Fall back to single
1903 * segment length write.
1904 *
1905 * This is needed to avoid possible livelock in the
1906 * case that all segments in the iov cannot be copied
1907 * at once without a pagefault.
1908 */
1909 sc = iov_iter_single_seg_count(i);
1910 if (bytes > sc)
1911 bytes = sc;
1912 goto again;
1913 }
1914 iov_iter_advance(i, copied);
1915 pos += copied;
1916 written += copied;
1917 balance_dirty_pages_ratelimited(mapping);
1918 if (fatal_signal_pending(current)) {
1919 status = -EINTR;
1920 break;
1921 }
1922 } while (iov_iter_count(i));
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001923 if (cached_page)
1924 page_cache_release(cached_page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001925 ntfs_debug("Done. Returning %s (written 0x%lx, status %li).",
1926 written ? "written" : "status", (unsigned long)written,
1927 (long)status);
1928 return written ? written : status;
1929}
1930
1931/**
Anton Altaparmakova632f552015-03-11 10:43:32 -04001932 * ntfs_file_write_iter - simple wrapper for ntfs_file_write_iter_nolock()
1933 * @iocb: IO state structure
1934 * @from: iov_iter with data to write
1935 *
1936 * Basically the same as generic_file_write_iter() except that it ends up
Al Viroccca2682015-04-05 14:06:24 -04001937 * up calling ntfs_perform_write() instead of generic_perform_write() and that
1938 * O_DIRECT is not implemented.
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001939 */
Anton Altaparmakova632f552015-03-11 10:43:32 -04001940static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001941{
1942 struct file *file = iocb->ki_filp;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001943 struct inode *vi = file_inode(file);
Al Viroccca2682015-04-05 14:06:24 -04001944 ssize_t written = 0;
1945 ssize_t err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001946
Anton Altaparmakova632f552015-03-11 10:43:32 -04001947 mutex_lock(&vi->i_mutex);
Al Viroccca2682015-04-05 14:06:24 -04001948 /* We can write back this queue in page reclaim. */
1949 current->backing_dev_info = inode_to_bdi(vi);
1950 err = ntfs_prepare_file_for_write(iocb, from);
1951 if (iov_iter_count(from) && !err)
1952 written = ntfs_perform_write(file, from, iocb->ki_pos);
1953 current->backing_dev_info = NULL;
Anton Altaparmakova632f552015-03-11 10:43:32 -04001954 mutex_unlock(&vi->i_mutex);
Al Viroccca2682015-04-05 14:06:24 -04001955 if (likely(written > 0)) {
1956 err = generic_write_sync(file, iocb->ki_pos, written);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001957 if (err < 0)
Al Viroccca2682015-04-05 14:06:24 -04001958 written = 0;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001959 }
Al Viroccca2682015-04-05 14:06:24 -04001960 iocb->ki_pos += written;
1961 return written ? written : err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001962}
1963
1964/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 * ntfs_file_fsync - sync a file to disk
1966 * @filp: file to be synced
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 * @datasync: if non-zero only flush user data and not metadata
1968 *
1969 * Data integrity sync of a file to disk. Used for fsync, fdatasync, and msync
1970 * system calls. This function is inspired by fs/buffer.c::file_fsync().
1971 *
1972 * If @datasync is false, write the mft record and all associated extent mft
1973 * records as well as the $DATA attribute and then sync the block device.
1974 *
1975 * If @datasync is true and the attribute is non-resident, we skip the writing
1976 * of the mft record and all associated extent mft records (this might still
1977 * happen due to the write_inode_now() call).
1978 *
1979 * Also, if @datasync is true, we do not wait on the inode to be written out
1980 * but we always wait on the page cache pages to be written out.
1981 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001982 * Locking: Caller must hold i_mutex on the inode.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 *
1984 * TODO: We should probably also write all attribute/index inodes associated
1985 * with this inode but since we have no simple way of getting to them we ignore
1986 * this problem for now.
1987 */
Josef Bacik02c24a82011-07-16 20:44:56 -04001988static int ntfs_file_fsync(struct file *filp, loff_t start, loff_t end,
1989 int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001991 struct inode *vi = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 int err, ret = 0;
1993
1994 ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
Josef Bacik02c24a82011-07-16 20:44:56 -04001995
1996 err = filemap_write_and_wait_range(vi->i_mapping, start, end);
1997 if (err)
1998 return err;
1999 mutex_lock(&vi->i_mutex);
2000
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 BUG_ON(S_ISDIR(vi->i_mode));
2002 if (!datasync || !NInoNonResident(NTFS_I(vi)))
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002003 ret = __ntfs_write_inode(vi, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 write_inode_now(vi, !datasync);
Anton Altaparmakovf25dfb52005-09-08 20:35:33 +01002005 /*
2006 * NOTE: If we were to use mapping->private_list (see ext2 and
2007 * fs/buffer.c) for dirty blocks then we could optimize the below to be
2008 * sync_mapping_buffers(vi->i_mapping).
2009 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 err = sync_blockdev(vi->i_sb->s_bdev);
2011 if (unlikely(err && !ret))
2012 ret = err;
2013 if (likely(!ret))
2014 ntfs_debug("Done.");
2015 else
2016 ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error "
2017 "%u.", datasync ? "data" : "", vi->i_ino, -ret);
Josef Bacik02c24a82011-07-16 20:44:56 -04002018 mutex_unlock(&vi->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 return ret;
2020}
2021
2022#endif /* NTFS_RW */
2023
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002024const struct file_operations ntfs_file_ops = {
Anton Altaparmakova632f552015-03-11 10:43:32 -04002025 .llseek = generic_file_llseek,
Anton Altaparmakova632f552015-03-11 10:43:32 -04002026 .read_iter = generic_file_read_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027#ifdef NTFS_RW
Anton Altaparmakova632f552015-03-11 10:43:32 -04002028 .write_iter = ntfs_file_write_iter,
2029 .fsync = ntfs_file_fsync,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030#endif /* NTFS_RW */
Anton Altaparmakova632f552015-03-11 10:43:32 -04002031 .mmap = generic_file_mmap,
2032 .open = ntfs_file_open,
2033 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034};
2035
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002036const struct inode_operations ntfs_file_inode_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037#ifdef NTFS_RW
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 .setattr = ntfs_setattr,
2039#endif /* NTFS_RW */
2040};
2041
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002042const struct file_operations ntfs_empty_file_ops = {};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002044const struct inode_operations ntfs_empty_inode_ops = {};