blob: db9bd8a31725477eb9130bb6868d25bda510aa4a [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 Altaparmakov2818ef52011-01-12 10:34:35 +00004 * Copyright (c) 2001-2011 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/gfp.h>
Anton Altaparmakov98b27032005-10-11 15:40:40 +010024#include <linux/pagemap.h>
25#include <linux/pagevec.h>
26#include <linux/sched.h>
27#include <linux/swap.h>
28#include <linux/uio.h>
29#include <linux/writeback.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070030#include <linux/aio.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
77 * @cached_page: store any allocated but unused page here
78 * @lru_pvec: lru-buffering pagevec of the caller
79 *
80 * Extend the initialized size of an attribute described by the ntfs inode @ni
81 * to @new_init_size bytes. This involves zeroing any non-sparse space between
82 * the old initialized size and @new_init_size both in the page cache and on
Anton Altaparmakovdda65b92005-10-24 08:57:59 +010083 * disk (if relevant complete pages are already uptodate in the page cache then
84 * these are simply marked dirty).
Anton Altaparmakov98b27032005-10-11 15:40:40 +010085 *
86 * As a side-effect, the file size (vfs inode->i_size) may be incremented as,
87 * in the resident attribute case, it is tied to the initialized size and, in
88 * the non-resident attribute case, it may not fall below the initialized size.
89 *
90 * Note that if the attribute is resident, we do not need to touch the page
91 * cache at all. This is because if the page cache page is not uptodate we
92 * bring it uptodate later, when doing the write to the mft record since we
93 * then already have the page mapped. And if the page is uptodate, the
94 * non-initialized region will already have been zeroed when the page was
95 * brought uptodate and the region may in fact already have been overwritten
96 * with new data via mmap() based writes, so we cannot just zero it. And since
97 * POSIX specifies that the behaviour of resizing a file whilst it is mmap()ped
98 * is unspecified, we choose not to do zeroing and thus we do not need to touch
Anton Altaparmakovdda65b92005-10-24 08:57:59 +010099 * the page at all. For a more detailed explanation see ntfs_truncate() in
100 * fs/ntfs/inode.c.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100101 *
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100102 * Return 0 on success and -errno on error. In the case that an error is
103 * encountered it is possible that the initialized size will already have been
104 * incremented some way towards @new_init_size but it is guaranteed that if
105 * this is the case, the necessary zeroing will also have happened and that all
106 * metadata is self-consistent.
107 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800108 * Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
Anton Altaparmakovdda65b92005-10-24 08:57:59 +0100109 * held by the caller.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100110 */
Minchan Kim2ec93b02010-05-24 14:33:06 -0700111static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size)
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100112{
113 s64 old_init_size;
114 loff_t old_i_size;
115 pgoff_t index, end_index;
116 unsigned long flags;
117 struct inode *vi = VFS_I(ni);
118 ntfs_inode *base_ni;
119 MFT_RECORD *m = NULL;
120 ATTR_RECORD *a;
121 ntfs_attr_search_ctx *ctx = NULL;
122 struct address_space *mapping;
123 struct page *page = NULL;
124 u8 *kattr;
125 int err;
126 u32 attr_len;
127
128 read_lock_irqsave(&ni->size_lock, flags);
129 old_init_size = ni->initialized_size;
130 old_i_size = i_size_read(vi);
131 BUG_ON(new_init_size > ni->allocated_size);
132 read_unlock_irqrestore(&ni->size_lock, flags);
133 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
134 "old_initialized_size 0x%llx, "
135 "new_initialized_size 0x%llx, i_size 0x%llx.",
136 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
137 (unsigned long long)old_init_size,
138 (unsigned long long)new_init_size, old_i_size);
139 if (!NInoAttr(ni))
140 base_ni = ni;
141 else
142 base_ni = ni->ext.base_ntfs_ino;
143 /* Use goto to reduce indentation and we need the label below anyway. */
144 if (NInoNonResident(ni))
145 goto do_non_resident_extend;
146 BUG_ON(old_init_size != old_i_size);
147 m = map_mft_record(base_ni);
148 if (IS_ERR(m)) {
149 err = PTR_ERR(m);
150 m = NULL;
151 goto err_out;
152 }
153 ctx = ntfs_attr_get_search_ctx(base_ni, m);
154 if (unlikely(!ctx)) {
155 err = -ENOMEM;
156 goto err_out;
157 }
158 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
159 CASE_SENSITIVE, 0, NULL, 0, ctx);
160 if (unlikely(err)) {
161 if (err == -ENOENT)
162 err = -EIO;
163 goto err_out;
164 }
165 m = ctx->mrec;
166 a = ctx->attr;
167 BUG_ON(a->non_resident);
168 /* The total length of the attribute value. */
169 attr_len = le32_to_cpu(a->data.resident.value_length);
170 BUG_ON(old_i_size != (loff_t)attr_len);
171 /*
172 * Do the zeroing in the mft record and update the attribute size in
173 * the mft record.
174 */
175 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
176 memset(kattr + attr_len, 0, new_init_size - attr_len);
177 a->data.resident.value_length = cpu_to_le32((u32)new_init_size);
178 /* Finally, update the sizes in the vfs and ntfs inodes. */
179 write_lock_irqsave(&ni->size_lock, flags);
180 i_size_write(vi, new_init_size);
181 ni->initialized_size = new_init_size;
182 write_unlock_irqrestore(&ni->size_lock, flags);
183 goto done;
184do_non_resident_extend:
185 /*
186 * If the new initialized size @new_init_size exceeds the current file
187 * size (vfs inode->i_size), we need to extend the file size to the
188 * new initialized size.
189 */
190 if (new_init_size > old_i_size) {
191 m = map_mft_record(base_ni);
192 if (IS_ERR(m)) {
193 err = PTR_ERR(m);
194 m = NULL;
195 goto err_out;
196 }
197 ctx = ntfs_attr_get_search_ctx(base_ni, m);
198 if (unlikely(!ctx)) {
199 err = -ENOMEM;
200 goto err_out;
201 }
202 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
203 CASE_SENSITIVE, 0, NULL, 0, ctx);
204 if (unlikely(err)) {
205 if (err == -ENOENT)
206 err = -EIO;
207 goto err_out;
208 }
209 m = ctx->mrec;
210 a = ctx->attr;
211 BUG_ON(!a->non_resident);
212 BUG_ON(old_i_size != (loff_t)
213 sle64_to_cpu(a->data.non_resident.data_size));
214 a->data.non_resident.data_size = cpu_to_sle64(new_init_size);
215 flush_dcache_mft_record_page(ctx->ntfs_ino);
216 mark_mft_record_dirty(ctx->ntfs_ino);
217 /* Update the file size in the vfs inode. */
218 i_size_write(vi, new_init_size);
219 ntfs_attr_put_search_ctx(ctx);
220 ctx = NULL;
221 unmap_mft_record(base_ni);
222 m = NULL;
223 }
224 mapping = vi->i_mapping;
225 index = old_init_size >> PAGE_CACHE_SHIFT;
226 end_index = (new_init_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
227 do {
228 /*
229 * Read the page. If the page is not present, this will zero
230 * the uninitialized regions for us.
231 */
Pekka Enberg090d2b12006-06-23 02:05:08 -0700232 page = read_mapping_page(mapping, index, NULL);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100233 if (IS_ERR(page)) {
234 err = PTR_ERR(page);
235 goto init_err_out;
236 }
Nick Piggin6fe69002007-05-06 14:49:04 -0700237 if (unlikely(PageError(page))) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100238 page_cache_release(page);
239 err = -EIO;
240 goto init_err_out;
241 }
242 /*
243 * Update the initialized size in the ntfs inode. This is
244 * enough to make ntfs_writepage() work.
245 */
246 write_lock_irqsave(&ni->size_lock, flags);
Anton Altaparmakov3c6af7f2005-11-24 13:41:33 +0000247 ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100248 if (ni->initialized_size > new_init_size)
249 ni->initialized_size = new_init_size;
250 write_unlock_irqrestore(&ni->size_lock, flags);
251 /* Set the page dirty so it gets written out. */
252 set_page_dirty(page);
253 page_cache_release(page);
254 /*
255 * Play nice with the vm and the rest of the system. This is
256 * very much needed as we can potentially be modifying the
257 * initialised size from a very small value to a really huge
258 * value, e.g.
259 * f = open(somefile, O_TRUNC);
260 * truncate(f, 10GiB);
261 * seek(f, 10GiB);
262 * write(f, 1);
263 * And this would mean we would be marking dirty hundreds of
264 * thousands of pages or as in the above example more than
265 * two and a half million pages!
266 *
267 * TODO: For sparse pages could optimize this workload by using
268 * the FsMisc / MiscFs page bit as a "PageIsSparse" bit. This
269 * would be set in readpage for sparse pages and here we would
270 * not need to mark dirty any pages which have this bit set.
271 * The only caveat is that we have to clear the bit everywhere
272 * where we allocate any clusters that lie in the page or that
273 * contain the page.
274 *
275 * TODO: An even greater optimization would be for us to only
276 * call readpage() on pages which are not in sparse regions as
277 * determined from the runlist. This would greatly reduce the
278 * number of pages we read and make dirty in the case of sparse
279 * files.
280 */
281 balance_dirty_pages_ratelimited(mapping);
282 cond_resched();
283 } while (++index < end_index);
284 read_lock_irqsave(&ni->size_lock, flags);
285 BUG_ON(ni->initialized_size != new_init_size);
286 read_unlock_irqrestore(&ni->size_lock, flags);
287 /* Now bring in sync the initialized_size in the mft record. */
288 m = map_mft_record(base_ni);
289 if (IS_ERR(m)) {
290 err = PTR_ERR(m);
291 m = NULL;
292 goto init_err_out;
293 }
294 ctx = ntfs_attr_get_search_ctx(base_ni, m);
295 if (unlikely(!ctx)) {
296 err = -ENOMEM;
297 goto init_err_out;
298 }
299 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
300 CASE_SENSITIVE, 0, NULL, 0, ctx);
301 if (unlikely(err)) {
302 if (err == -ENOENT)
303 err = -EIO;
304 goto init_err_out;
305 }
306 m = ctx->mrec;
307 a = ctx->attr;
308 BUG_ON(!a->non_resident);
309 a->data.non_resident.initialized_size = cpu_to_sle64(new_init_size);
310done:
311 flush_dcache_mft_record_page(ctx->ntfs_ino);
312 mark_mft_record_dirty(ctx->ntfs_ino);
313 if (ctx)
314 ntfs_attr_put_search_ctx(ctx);
315 if (m)
316 unmap_mft_record(base_ni);
317 ntfs_debug("Done, initialized_size 0x%llx, i_size 0x%llx.",
318 (unsigned long long)new_init_size, i_size_read(vi));
319 return 0;
320init_err_out:
321 write_lock_irqsave(&ni->size_lock, flags);
322 ni->initialized_size = old_init_size;
323 write_unlock_irqrestore(&ni->size_lock, flags);
324err_out:
325 if (ctx)
326 ntfs_attr_put_search_ctx(ctx);
327 if (m)
328 unmap_mft_record(base_ni);
329 ntfs_debug("Failed. Returning error code %i.", err);
330 return err;
331}
332
333/**
334 * ntfs_fault_in_pages_readable -
335 *
336 * Fault a number of userspace pages into pagetables.
337 *
338 * Unlike include/linux/pagemap.h::fault_in_pages_readable(), this one copes
339 * with more than two userspace pages as well as handling the single page case
340 * elegantly.
341 *
342 * If you find this difficult to understand, then think of the while loop being
343 * the following code, except that we do without the integer variable ret:
344 *
345 * do {
346 * ret = __get_user(c, uaddr);
347 * uaddr += PAGE_SIZE;
348 * } while (!ret && uaddr < end);
349 *
350 * Note, the final __get_user() may well run out-of-bounds of the user buffer,
351 * but _not_ out-of-bounds of the page the user buffer belongs to, and since
352 * this is only a read and not a write, and since it is still in the same page,
353 * it should not matter and this makes the code much simpler.
354 */
355static inline void ntfs_fault_in_pages_readable(const char __user *uaddr,
356 int bytes)
357{
358 const char __user *end;
359 volatile char c;
360
361 /* Set @end to the first byte outside the last page we care about. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +0100362 end = (const char __user*)PAGE_ALIGN((unsigned long)uaddr + bytes);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100363
364 while (!__get_user(c, uaddr) && (uaddr += PAGE_SIZE, uaddr < end))
365 ;
366}
367
368/**
369 * ntfs_fault_in_pages_readable_iovec -
370 *
371 * Same as ntfs_fault_in_pages_readable() but operates on an array of iovecs.
372 */
373static inline void ntfs_fault_in_pages_readable_iovec(const struct iovec *iov,
374 size_t iov_ofs, int bytes)
375{
376 do {
377 const char __user *buf;
378 unsigned len;
379
380 buf = iov->iov_base + iov_ofs;
381 len = iov->iov_len - iov_ofs;
382 if (len > bytes)
383 len = bytes;
384 ntfs_fault_in_pages_readable(buf, len);
385 bytes -= len;
386 iov++;
387 iov_ofs = 0;
388 } while (bytes);
389}
390
391/**
392 * __ntfs_grab_cache_pages - obtain a number of locked pages
393 * @mapping: address space mapping from which to obtain page cache pages
394 * @index: starting index in @mapping at which to begin obtaining pages
395 * @nr_pages: number of page cache pages to obtain
396 * @pages: array of pages in which to return the obtained page cache pages
397 * @cached_page: allocated but as yet unused page
398 * @lru_pvec: lru-buffering pagevec of caller
399 *
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200400 * Obtain @nr_pages locked page cache pages from the mapping @mapping and
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100401 * starting at index @index.
402 *
Minchan Kim4c990002010-05-24 14:33:07 -0700403 * If a page is newly created, add it to lru list
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100404 *
405 * Note, the page locks are obtained in ascending page index order.
406 */
407static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
408 pgoff_t index, const unsigned nr_pages, struct page **pages,
Minchan Kim4c990002010-05-24 14:33:07 -0700409 struct page **cached_page)
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100410{
411 int err, nr;
412
413 BUG_ON(!nr_pages);
414 err = nr = 0;
415 do {
416 pages[nr] = find_lock_page(mapping, index);
417 if (!pages[nr]) {
418 if (!*cached_page) {
419 *cached_page = page_cache_alloc(mapping);
420 if (unlikely(!*cached_page)) {
421 err = -ENOMEM;
422 goto err_out;
423 }
424 }
Minchan Kim4c990002010-05-24 14:33:07 -0700425 err = add_to_page_cache_lru(*cached_page, mapping, index,
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100426 GFP_KERNEL);
427 if (unlikely(err)) {
428 if (err == -EEXIST)
429 continue;
430 goto err_out;
431 }
432 pages[nr] = *cached_page;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100433 *cached_page = NULL;
434 }
435 index++;
436 nr++;
437 } while (nr < nr_pages);
438out:
439 return err;
440err_out:
441 while (nr > 0) {
442 unlock_page(pages[--nr]);
443 page_cache_release(pages[nr]);
444 }
445 goto out;
446}
447
448static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
449{
450 lock_buffer(bh);
451 get_bh(bh);
452 bh->b_end_io = end_buffer_read_sync;
453 return submit_bh(READ, bh);
454}
455
456/**
457 * ntfs_prepare_pages_for_non_resident_write - prepare pages for receiving data
458 * @pages: array of destination pages
459 * @nr_pages: number of pages in @pages
460 * @pos: byte position in file at which the write begins
461 * @bytes: number of bytes to be written
462 *
463 * This is called for non-resident attributes from ntfs_file_buffered_write()
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800464 * with i_mutex held on the inode (@pages[0]->mapping->host). There are
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100465 * @nr_pages pages in @pages which are locked but not kmap()ped. The source
466 * data has not yet been copied into the @pages.
467 *
468 * Need to fill any holes with actual clusters, allocate buffers if necessary,
469 * ensure all the buffers are mapped, and bring uptodate any buffers that are
470 * only partially being written to.
471 *
472 * If @nr_pages is greater than one, we are guaranteed that the cluster size is
473 * greater than PAGE_CACHE_SIZE, that all pages in @pages are entirely inside
474 * the same cluster and that they are the entirety of that cluster, and that
475 * the cluster is sparse, i.e. we need to allocate a cluster to fill the hole.
476 *
477 * i_size is not to be modified yet.
478 *
479 * Return 0 on success or -errno on error.
480 */
481static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
482 unsigned nr_pages, s64 pos, size_t bytes)
483{
484 VCN vcn, highest_vcn = 0, cpos, cend, bh_cpos, bh_cend;
485 LCN lcn;
486 s64 bh_pos, vcn_len, end, initialized_size;
487 sector_t lcn_block;
488 struct page *page;
489 struct inode *vi;
490 ntfs_inode *ni, *base_ni = NULL;
491 ntfs_volume *vol;
492 runlist_element *rl, *rl2;
493 struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
494 ntfs_attr_search_ctx *ctx = NULL;
495 MFT_RECORD *m = NULL;
496 ATTR_RECORD *a = NULL;
497 unsigned long flags;
498 u32 attr_rec_len = 0;
499 unsigned blocksize, u;
500 int err, mp_size;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700501 bool rl_write_locked, was_hole, is_retry;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100502 unsigned char blocksize_bits;
503 struct {
504 u8 runlist_merged:1;
505 u8 mft_attr_mapped:1;
506 u8 mp_rebuilt:1;
507 u8 attr_switched:1;
508 } status = { 0, 0, 0, 0 };
509
510 BUG_ON(!nr_pages);
511 BUG_ON(!pages);
512 BUG_ON(!*pages);
513 vi = pages[0]->mapping->host;
514 ni = NTFS_I(vi);
515 vol = ni->vol;
516 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +0100517 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100518 vi->i_ino, ni->type, pages[0]->index, nr_pages,
519 (long long)pos, bytes);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +0000520 blocksize = vol->sb->s_blocksize;
521 blocksize_bits = vol->sb->s_blocksize_bits;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100522 u = 0;
523 do {
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +0100524 page = pages[u];
525 BUG_ON(!page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100526 /*
527 * create_empty_buffers() will create uptodate/dirty buffers if
528 * the page is uptodate/dirty.
529 */
530 if (!page_has_buffers(page)) {
531 create_empty_buffers(page, blocksize, 0);
532 if (unlikely(!page_has_buffers(page)))
533 return -ENOMEM;
534 }
535 } while (++u < nr_pages);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700536 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100537 rl = NULL;
538 err = 0;
539 vcn = lcn = -1;
540 vcn_len = 0;
541 lcn_block = -1;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700542 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100543 cpos = pos >> vol->cluster_size_bits;
544 end = pos + bytes;
545 cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
546 /*
547 * Loop over each page and for each page over each buffer. Use goto to
548 * reduce indentation.
549 */
550 u = 0;
551do_next_page:
552 page = pages[u];
553 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
554 bh = head = page_buffers(page);
555 do {
556 VCN cdelta;
557 s64 bh_end;
558 unsigned bh_cofs;
559
560 /* Clear buffer_new on all buffers to reinitialise state. */
561 if (buffer_new(bh))
562 clear_buffer_new(bh);
563 bh_end = bh_pos + blocksize;
564 bh_cpos = bh_pos >> vol->cluster_size_bits;
565 bh_cofs = bh_pos & vol->cluster_size_mask;
566 if (buffer_mapped(bh)) {
567 /*
568 * The buffer is already mapped. If it is uptodate,
569 * ignore it.
570 */
571 if (buffer_uptodate(bh))
572 continue;
573 /*
574 * The buffer is not uptodate. If the page is uptodate
575 * set the buffer uptodate and otherwise ignore it.
576 */
577 if (PageUptodate(page)) {
578 set_buffer_uptodate(bh);
579 continue;
580 }
581 /*
582 * Neither the page nor the buffer are uptodate. If
583 * the buffer is only partially being written to, we
584 * need to read it in before the write, i.e. now.
585 */
586 if ((bh_pos < pos && bh_end > pos) ||
587 (bh_pos < end && bh_end > end)) {
588 /*
589 * If the buffer is fully or partially within
590 * the initialized size, do an actual read.
591 * Otherwise, simply zero the buffer.
592 */
593 read_lock_irqsave(&ni->size_lock, flags);
594 initialized_size = ni->initialized_size;
595 read_unlock_irqrestore(&ni->size_lock, flags);
596 if (bh_pos < initialized_size) {
597 ntfs_submit_bh_for_read(bh);
598 *wait_bh++ = bh;
599 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800600 zero_user(page, bh_offset(bh),
601 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100602 set_buffer_uptodate(bh);
603 }
604 }
605 continue;
606 }
607 /* Unmapped buffer. Need to map it. */
608 bh->b_bdev = vol->sb->s_bdev;
609 /*
610 * If the current buffer is in the same clusters as the map
611 * cache, there is no need to check the runlist again. The
612 * map cache is made up of @vcn, which is the first cached file
613 * cluster, @vcn_len which is the number of cached file
614 * clusters, @lcn is the device cluster corresponding to @vcn,
615 * and @lcn_block is the block number corresponding to @lcn.
616 */
617 cdelta = bh_cpos - vcn;
618 if (likely(!cdelta || (cdelta > 0 && cdelta < vcn_len))) {
619map_buffer_cached:
620 BUG_ON(lcn < 0);
621 bh->b_blocknr = lcn_block +
622 (cdelta << (vol->cluster_size_bits -
623 blocksize_bits)) +
624 (bh_cofs >> blocksize_bits);
625 set_buffer_mapped(bh);
626 /*
627 * If the page is uptodate so is the buffer. If the
628 * buffer is fully outside the write, we ignore it if
629 * it was already allocated and we mark it dirty so it
630 * gets written out if we allocated it. On the other
631 * hand, if we allocated the buffer but we are not
632 * marking it dirty we set buffer_new so we can do
633 * error recovery.
634 */
635 if (PageUptodate(page)) {
636 if (!buffer_uptodate(bh))
637 set_buffer_uptodate(bh);
638 if (unlikely(was_hole)) {
639 /* We allocated the buffer. */
640 unmap_underlying_metadata(bh->b_bdev,
641 bh->b_blocknr);
642 if (bh_end <= pos || bh_pos >= end)
643 mark_buffer_dirty(bh);
644 else
645 set_buffer_new(bh);
646 }
647 continue;
648 }
649 /* Page is _not_ uptodate. */
650 if (likely(!was_hole)) {
651 /*
652 * Buffer was already allocated. If it is not
653 * uptodate and is only partially being written
654 * to, we need to read it in before the write,
655 * i.e. now.
656 */
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000657 if (!buffer_uptodate(bh) && bh_pos < end &&
658 bh_end > pos &&
659 (bh_pos < pos ||
660 bh_end > end)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100661 /*
662 * If the buffer is fully or partially
663 * within the initialized size, do an
664 * actual read. Otherwise, simply zero
665 * the buffer.
666 */
667 read_lock_irqsave(&ni->size_lock,
668 flags);
669 initialized_size = ni->initialized_size;
670 read_unlock_irqrestore(&ni->size_lock,
671 flags);
672 if (bh_pos < initialized_size) {
673 ntfs_submit_bh_for_read(bh);
674 *wait_bh++ = bh;
675 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800676 zero_user(page, bh_offset(bh),
677 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100678 set_buffer_uptodate(bh);
679 }
680 }
681 continue;
682 }
683 /* We allocated the buffer. */
684 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
685 /*
686 * If the buffer is fully outside the write, zero it,
687 * set it uptodate, and mark it dirty so it gets
688 * written out. If it is partially being written to,
689 * zero region surrounding the write but leave it to
690 * commit write to do anything else. Finally, if the
691 * buffer is fully being overwritten, do nothing.
692 */
693 if (bh_end <= pos || bh_pos >= end) {
694 if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800695 zero_user(page, bh_offset(bh),
696 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100697 set_buffer_uptodate(bh);
698 }
699 mark_buffer_dirty(bh);
700 continue;
701 }
702 set_buffer_new(bh);
703 if (!buffer_uptodate(bh) &&
704 (bh_pos < pos || bh_end > end)) {
705 u8 *kaddr;
706 unsigned pofs;
707
Cong Wanga3ac1412011-11-25 23:14:34 +0800708 kaddr = kmap_atomic(page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100709 if (bh_pos < pos) {
710 pofs = bh_pos & ~PAGE_CACHE_MASK;
711 memset(kaddr + pofs, 0, pos - bh_pos);
712 }
713 if (bh_end > end) {
714 pofs = end & ~PAGE_CACHE_MASK;
715 memset(kaddr + pofs, 0, bh_end - end);
716 }
Cong Wanga3ac1412011-11-25 23:14:34 +0800717 kunmap_atomic(kaddr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100718 flush_dcache_page(page);
719 }
720 continue;
721 }
722 /*
723 * Slow path: this is the first buffer in the cluster. If it
724 * is outside allocated size and is not uptodate, zero it and
725 * set it uptodate.
726 */
727 read_lock_irqsave(&ni->size_lock, flags);
728 initialized_size = ni->allocated_size;
729 read_unlock_irqrestore(&ni->size_lock, flags);
730 if (bh_pos > initialized_size) {
731 if (PageUptodate(page)) {
732 if (!buffer_uptodate(bh))
733 set_buffer_uptodate(bh);
734 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800735 zero_user(page, bh_offset(bh), blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100736 set_buffer_uptodate(bh);
737 }
738 continue;
739 }
Richard Knutssonc49c3112006-09-30 23:27:12 -0700740 is_retry = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100741 if (!rl) {
742 down_read(&ni->runlist.lock);
743retry_remap:
744 rl = ni->runlist.rl;
745 }
746 if (likely(rl != NULL)) {
747 /* Seek to element containing target cluster. */
748 while (rl->length && rl[1].vcn <= bh_cpos)
749 rl++;
750 lcn = ntfs_rl_vcn_to_lcn(rl, bh_cpos);
751 if (likely(lcn >= 0)) {
752 /*
753 * Successful remap, setup the map cache and
754 * use that to deal with the buffer.
755 */
Richard Knutssonc49c3112006-09-30 23:27:12 -0700756 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100757 vcn = bh_cpos;
758 vcn_len = rl[1].vcn - vcn;
759 lcn_block = lcn << (vol->cluster_size_bits -
760 blocksize_bits);
Anton Altaparmakovd5aeaef2005-10-19 12:23:10 +0100761 cdelta = 0;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100762 /*
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000763 * If the number of remaining clusters touched
764 * by the write is smaller or equal to the
765 * number of cached clusters, unlock the
766 * runlist as the map cache will be used from
767 * now on.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100768 */
769 if (likely(vcn + vcn_len >= cend)) {
770 if (rl_write_locked) {
771 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700772 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100773 } else
774 up_read(&ni->runlist.lock);
775 rl = NULL;
776 }
777 goto map_buffer_cached;
778 }
779 } else
780 lcn = LCN_RL_NOT_MAPPED;
781 /*
782 * If it is not a hole and not out of bounds, the runlist is
783 * probably unmapped so try to map it now.
784 */
785 if (unlikely(lcn != LCN_HOLE && lcn != LCN_ENOENT)) {
786 if (likely(!is_retry && lcn == LCN_RL_NOT_MAPPED)) {
787 /* Attempt to map runlist. */
788 if (!rl_write_locked) {
789 /*
790 * We need the runlist locked for
791 * writing, so if it is locked for
792 * reading relock it now and retry in
793 * case it changed whilst we dropped
794 * the lock.
795 */
796 up_read(&ni->runlist.lock);
797 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700798 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100799 goto retry_remap;
800 }
801 err = ntfs_map_runlist_nolock(ni, bh_cpos,
802 NULL);
803 if (likely(!err)) {
Richard Knutssonc49c3112006-09-30 23:27:12 -0700804 is_retry = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100805 goto retry_remap;
806 }
807 /*
808 * If @vcn is out of bounds, pretend @lcn is
809 * LCN_ENOENT. As long as the buffer is out
810 * of bounds this will work fine.
811 */
812 if (err == -ENOENT) {
813 lcn = LCN_ENOENT;
814 err = 0;
815 goto rl_not_mapped_enoent;
816 }
817 } else
818 err = -EIO;
819 /* Failed to map the buffer, even after retrying. */
820 bh->b_blocknr = -1;
821 ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
822 "attribute type 0x%x, vcn 0x%llx, "
823 "vcn offset 0x%x, because its "
824 "location on disk could not be "
825 "determined%s (error code %i).",
826 ni->mft_no, ni->type,
827 (unsigned long long)bh_cpos,
828 (unsigned)bh_pos &
829 vol->cluster_size_mask,
830 is_retry ? " even after retrying" : "",
831 err);
832 break;
833 }
834rl_not_mapped_enoent:
835 /*
836 * The buffer is in a hole or out of bounds. We need to fill
837 * the hole, unless the buffer is in a cluster which is not
838 * touched by the write, in which case we just leave the buffer
839 * unmapped. This can only happen when the cluster size is
840 * less than the page cache size.
841 */
842 if (unlikely(vol->cluster_size < PAGE_CACHE_SIZE)) {
843 bh_cend = (bh_end + vol->cluster_size - 1) >>
844 vol->cluster_size_bits;
845 if ((bh_cend <= cpos || bh_cpos >= cend)) {
846 bh->b_blocknr = -1;
847 /*
848 * If the buffer is uptodate we skip it. If it
849 * is not but the page is uptodate, we can set
850 * the buffer uptodate. If the page is not
851 * uptodate, we can clear the buffer and set it
852 * uptodate. Whether this is worthwhile is
853 * debatable and this could be removed.
854 */
855 if (PageUptodate(page)) {
856 if (!buffer_uptodate(bh))
857 set_buffer_uptodate(bh);
858 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800859 zero_user(page, bh_offset(bh),
860 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100861 set_buffer_uptodate(bh);
862 }
863 continue;
864 }
865 }
866 /*
867 * Out of bounds buffer is invalid if it was not really out of
868 * bounds.
869 */
870 BUG_ON(lcn != LCN_HOLE);
871 /*
872 * We need the runlist locked for writing, so if it is locked
873 * for reading relock it now and retry in case it changed
874 * whilst we dropped the lock.
875 */
876 BUG_ON(!rl);
877 if (!rl_write_locked) {
878 up_read(&ni->runlist.lock);
879 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700880 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100881 goto retry_remap;
882 }
883 /* Find the previous last allocated cluster. */
884 BUG_ON(rl->lcn != LCN_HOLE);
885 lcn = -1;
886 rl2 = rl;
887 while (--rl2 >= ni->runlist.rl) {
888 if (rl2->lcn >= 0) {
889 lcn = rl2->lcn + rl2->length;
890 break;
891 }
892 }
893 rl2 = ntfs_cluster_alloc(vol, bh_cpos, 1, lcn, DATA_ZONE,
Richard Knutssonc49c3112006-09-30 23:27:12 -0700894 false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100895 if (IS_ERR(rl2)) {
896 err = PTR_ERR(rl2);
897 ntfs_debug("Failed to allocate cluster, error code %i.",
898 err);
899 break;
900 }
901 lcn = rl2->lcn;
902 rl = ntfs_runlists_merge(ni->runlist.rl, rl2);
903 if (IS_ERR(rl)) {
904 err = PTR_ERR(rl);
905 if (err != -ENOMEM)
906 err = -EIO;
907 if (ntfs_cluster_free_from_rl(vol, rl2)) {
908 ntfs_error(vol->sb, "Failed to release "
909 "allocated cluster in error "
910 "code path. Run chkdsk to "
911 "recover the lost cluster.");
912 NVolSetErrors(vol);
913 }
914 ntfs_free(rl2);
915 break;
916 }
917 ni->runlist.rl = rl;
918 status.runlist_merged = 1;
Anton Altaparmakovbb8047d2006-03-07 11:53:46 +0000919 ntfs_debug("Allocated cluster, lcn 0x%llx.",
920 (unsigned long long)lcn);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100921 /* Map and lock the mft record and get the attribute record. */
922 if (!NInoAttr(ni))
923 base_ni = ni;
924 else
925 base_ni = ni->ext.base_ntfs_ino;
926 m = map_mft_record(base_ni);
927 if (IS_ERR(m)) {
928 err = PTR_ERR(m);
929 break;
930 }
931 ctx = ntfs_attr_get_search_ctx(base_ni, m);
932 if (unlikely(!ctx)) {
933 err = -ENOMEM;
934 unmap_mft_record(base_ni);
935 break;
936 }
937 status.mft_attr_mapped = 1;
938 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
939 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx);
940 if (unlikely(err)) {
941 if (err == -ENOENT)
942 err = -EIO;
943 break;
944 }
945 m = ctx->mrec;
946 a = ctx->attr;
947 /*
948 * Find the runlist element with which the attribute extent
949 * starts. Note, we cannot use the _attr_ version because we
950 * have mapped the mft record. That is ok because we know the
951 * runlist fragment must be mapped already to have ever gotten
952 * here, so we can just use the _rl_ version.
953 */
954 vcn = sle64_to_cpu(a->data.non_resident.lowest_vcn);
955 rl2 = ntfs_rl_find_vcn_nolock(rl, vcn);
956 BUG_ON(!rl2);
957 BUG_ON(!rl2->length);
958 BUG_ON(rl2->lcn < LCN_HOLE);
959 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
960 /*
961 * If @highest_vcn is zero, calculate the real highest_vcn
962 * (which can really be zero).
963 */
964 if (!highest_vcn)
965 highest_vcn = (sle64_to_cpu(
966 a->data.non_resident.allocated_size) >>
967 vol->cluster_size_bits) - 1;
968 /*
969 * Determine the size of the mapping pairs array for the new
970 * extent, i.e. the old extent with the hole filled.
971 */
972 mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, vcn,
973 highest_vcn);
974 if (unlikely(mp_size <= 0)) {
975 if (!(err = mp_size))
976 err = -EIO;
977 ntfs_debug("Failed to get size for mapping pairs "
978 "array, error code %i.", err);
979 break;
980 }
981 /*
982 * Resize the attribute record to fit the new mapping pairs
983 * array.
984 */
985 attr_rec_len = le32_to_cpu(a->length);
986 err = ntfs_attr_record_resize(m, a, mp_size + le16_to_cpu(
987 a->data.non_resident.mapping_pairs_offset));
988 if (unlikely(err)) {
989 BUG_ON(err != -ENOSPC);
990 // TODO: Deal with this by using the current attribute
991 // and fill it with as much of the mapping pairs
992 // array as possible. Then loop over each attribute
993 // extent rewriting the mapping pairs arrays as we go
994 // along and if when we reach the end we have not
995 // enough space, try to resize the last attribute
996 // extent and if even that fails, add a new attribute
997 // extent.
998 // We could also try to resize at each step in the hope
999 // that we will not need to rewrite every single extent.
1000 // Note, we may need to decompress some extents to fill
1001 // the runlist as we are walking the extents...
1002 ntfs_error(vol->sb, "Not enough space in the mft "
1003 "record for the extended attribute "
1004 "record. This case is not "
1005 "implemented yet.");
1006 err = -EOPNOTSUPP;
1007 break ;
1008 }
1009 status.mp_rebuilt = 1;
1010 /*
1011 * Generate the mapping pairs array directly into the attribute
1012 * record.
1013 */
1014 err = ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
1015 a->data.non_resident.mapping_pairs_offset),
1016 mp_size, rl2, vcn, highest_vcn, NULL);
1017 if (unlikely(err)) {
1018 ntfs_error(vol->sb, "Cannot fill hole in inode 0x%lx, "
1019 "attribute type 0x%x, because building "
1020 "the mapping pairs failed with error "
1021 "code %i.", vi->i_ino,
1022 (unsigned)le32_to_cpu(ni->type), err);
1023 err = -EIO;
1024 break;
1025 }
1026 /* Update the highest_vcn but only if it was not set. */
1027 if (unlikely(!a->data.non_resident.highest_vcn))
1028 a->data.non_resident.highest_vcn =
1029 cpu_to_sle64(highest_vcn);
1030 /*
1031 * If the attribute is sparse/compressed, update the compressed
1032 * size in the ntfs_inode structure and the attribute record.
1033 */
1034 if (likely(NInoSparse(ni) || NInoCompressed(ni))) {
1035 /*
1036 * If we are not in the first attribute extent, switch
1037 * to it, but first ensure the changes will make it to
1038 * disk later.
1039 */
1040 if (a->data.non_resident.lowest_vcn) {
1041 flush_dcache_mft_record_page(ctx->ntfs_ino);
1042 mark_mft_record_dirty(ctx->ntfs_ino);
1043 ntfs_attr_reinit_search_ctx(ctx);
1044 err = ntfs_attr_lookup(ni->type, ni->name,
1045 ni->name_len, CASE_SENSITIVE,
1046 0, NULL, 0, ctx);
1047 if (unlikely(err)) {
1048 status.attr_switched = 1;
1049 break;
1050 }
1051 /* @m is not used any more so do not set it. */
1052 a = ctx->attr;
1053 }
1054 write_lock_irqsave(&ni->size_lock, flags);
1055 ni->itype.compressed.size += vol->cluster_size;
1056 a->data.non_resident.compressed_size =
1057 cpu_to_sle64(ni->itype.compressed.size);
1058 write_unlock_irqrestore(&ni->size_lock, flags);
1059 }
1060 /* Ensure the changes make it to disk. */
1061 flush_dcache_mft_record_page(ctx->ntfs_ino);
1062 mark_mft_record_dirty(ctx->ntfs_ino);
1063 ntfs_attr_put_search_ctx(ctx);
1064 unmap_mft_record(base_ni);
1065 /* Successfully filled the hole. */
1066 status.runlist_merged = 0;
1067 status.mft_attr_mapped = 0;
1068 status.mp_rebuilt = 0;
1069 /* Setup the map cache and use that to deal with the buffer. */
Richard Knutssonc49c3112006-09-30 23:27:12 -07001070 was_hole = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001071 vcn = bh_cpos;
1072 vcn_len = 1;
1073 lcn_block = lcn << (vol->cluster_size_bits - blocksize_bits);
1074 cdelta = 0;
1075 /*
1076 * If the number of remaining clusters in the @pages is smaller
1077 * or equal to the number of cached clusters, unlock the
1078 * runlist as the map cache will be used from now on.
1079 */
1080 if (likely(vcn + vcn_len >= cend)) {
1081 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001082 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001083 rl = NULL;
1084 }
1085 goto map_buffer_cached;
1086 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1087 /* If there are no errors, do the next page. */
1088 if (likely(!err && ++u < nr_pages))
1089 goto do_next_page;
1090 /* If there are no errors, release the runlist lock if we took it. */
1091 if (likely(!err)) {
1092 if (unlikely(rl_write_locked)) {
1093 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001094 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001095 } else if (unlikely(rl))
1096 up_read(&ni->runlist.lock);
1097 rl = NULL;
1098 }
1099 /* If we issued read requests, let them complete. */
1100 read_lock_irqsave(&ni->size_lock, flags);
1101 initialized_size = ni->initialized_size;
1102 read_unlock_irqrestore(&ni->size_lock, flags);
1103 while (wait_bh > wait) {
1104 bh = *--wait_bh;
1105 wait_on_buffer(bh);
1106 if (likely(buffer_uptodate(bh))) {
1107 page = bh->b_page;
1108 bh_pos = ((s64)page->index << PAGE_CACHE_SHIFT) +
1109 bh_offset(bh);
1110 /*
1111 * If the buffer overflows the initialized size, need
1112 * to zero the overflowing region.
1113 */
1114 if (unlikely(bh_pos + blocksize > initialized_size)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001115 int ofs = 0;
1116
1117 if (likely(bh_pos < initialized_size))
1118 ofs = initialized_size - bh_pos;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001119 zero_user_segment(page, bh_offset(bh) + ofs,
1120 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001121 }
1122 } else /* if (unlikely(!buffer_uptodate(bh))) */
1123 err = -EIO;
1124 }
1125 if (likely(!err)) {
1126 /* Clear buffer_new on all buffers. */
1127 u = 0;
1128 do {
1129 bh = head = page_buffers(pages[u]);
1130 do {
1131 if (buffer_new(bh))
1132 clear_buffer_new(bh);
1133 } while ((bh = bh->b_this_page) != head);
1134 } while (++u < nr_pages);
1135 ntfs_debug("Done.");
1136 return err;
1137 }
1138 if (status.attr_switched) {
1139 /* Get back to the attribute extent we modified. */
1140 ntfs_attr_reinit_search_ctx(ctx);
1141 if (ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1142 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx)) {
1143 ntfs_error(vol->sb, "Failed to find required "
1144 "attribute extent of attribute in "
1145 "error code path. Run chkdsk to "
1146 "recover.");
1147 write_lock_irqsave(&ni->size_lock, flags);
1148 ni->itype.compressed.size += vol->cluster_size;
1149 write_unlock_irqrestore(&ni->size_lock, flags);
1150 flush_dcache_mft_record_page(ctx->ntfs_ino);
1151 mark_mft_record_dirty(ctx->ntfs_ino);
1152 /*
1153 * The only thing that is now wrong is the compressed
1154 * size of the base attribute extent which chkdsk
1155 * should be able to fix.
1156 */
1157 NVolSetErrors(vol);
1158 } else {
1159 m = ctx->mrec;
1160 a = ctx->attr;
1161 status.attr_switched = 0;
1162 }
1163 }
1164 /*
1165 * If the runlist has been modified, need to restore it by punching a
1166 * hole into it and we then need to deallocate the on-disk cluster as
1167 * well. Note, we only modify the runlist if we are able to generate a
1168 * new mapping pairs array, i.e. only when the mapped attribute extent
1169 * is not switched.
1170 */
1171 if (status.runlist_merged && !status.attr_switched) {
1172 BUG_ON(!rl_write_locked);
1173 /* Make the file cluster we allocated sparse in the runlist. */
1174 if (ntfs_rl_punch_nolock(vol, &ni->runlist, bh_cpos, 1)) {
1175 ntfs_error(vol->sb, "Failed to punch hole into "
1176 "attribute runlist in error code "
1177 "path. Run chkdsk to recover the "
1178 "lost cluster.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001179 NVolSetErrors(vol);
1180 } else /* if (success) */ {
1181 status.runlist_merged = 0;
1182 /*
1183 * Deallocate the on-disk cluster we allocated but only
1184 * if we succeeded in punching its vcn out of the
1185 * runlist.
1186 */
1187 down_write(&vol->lcnbmp_lock);
1188 if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
1189 ntfs_error(vol->sb, "Failed to release "
1190 "allocated cluster in error "
1191 "code path. Run chkdsk to "
1192 "recover the lost cluster.");
1193 NVolSetErrors(vol);
1194 }
1195 up_write(&vol->lcnbmp_lock);
1196 }
1197 }
1198 /*
1199 * Resize the attribute record to its old size and rebuild the mapping
1200 * pairs array. Note, we only can do this if the runlist has been
1201 * restored to its old state which also implies that the mapped
1202 * attribute extent is not switched.
1203 */
1204 if (status.mp_rebuilt && !status.runlist_merged) {
1205 if (ntfs_attr_record_resize(m, a, attr_rec_len)) {
1206 ntfs_error(vol->sb, "Failed to restore attribute "
1207 "record in error code path. Run "
1208 "chkdsk to recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001209 NVolSetErrors(vol);
1210 } else /* if (success) */ {
1211 if (ntfs_mapping_pairs_build(vol, (u8*)a +
1212 le16_to_cpu(a->data.non_resident.
1213 mapping_pairs_offset), attr_rec_len -
1214 le16_to_cpu(a->data.non_resident.
1215 mapping_pairs_offset), ni->runlist.rl,
1216 vcn, highest_vcn, NULL)) {
1217 ntfs_error(vol->sb, "Failed to restore "
1218 "mapping pairs array in error "
1219 "code path. Run chkdsk to "
1220 "recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001221 NVolSetErrors(vol);
1222 }
1223 flush_dcache_mft_record_page(ctx->ntfs_ino);
1224 mark_mft_record_dirty(ctx->ntfs_ino);
1225 }
1226 }
1227 /* Release the mft record and the attribute. */
1228 if (status.mft_attr_mapped) {
1229 ntfs_attr_put_search_ctx(ctx);
1230 unmap_mft_record(base_ni);
1231 }
1232 /* Release the runlist lock. */
1233 if (rl_write_locked)
1234 up_write(&ni->runlist.lock);
1235 else if (rl)
1236 up_read(&ni->runlist.lock);
1237 /*
1238 * Zero out any newly allocated blocks to avoid exposing stale data.
1239 * If BH_New is set, we know that the block was newly allocated above
1240 * and that it has not been fully zeroed and marked dirty yet.
1241 */
1242 nr_pages = u;
1243 u = 0;
1244 end = bh_cpos << vol->cluster_size_bits;
1245 do {
1246 page = pages[u];
1247 bh = head = page_buffers(page);
1248 do {
1249 if (u == nr_pages &&
1250 ((s64)page->index << PAGE_CACHE_SHIFT) +
1251 bh_offset(bh) >= end)
1252 break;
1253 if (!buffer_new(bh))
1254 continue;
1255 clear_buffer_new(bh);
1256 if (!buffer_uptodate(bh)) {
1257 if (PageUptodate(page))
1258 set_buffer_uptodate(bh);
1259 else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001260 zero_user(page, bh_offset(bh),
1261 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001262 set_buffer_uptodate(bh);
1263 }
1264 }
1265 mark_buffer_dirty(bh);
1266 } while ((bh = bh->b_this_page) != head);
1267 } while (++u <= nr_pages);
1268 ntfs_error(vol->sb, "Failed. Returning error code %i.", err);
1269 return err;
1270}
1271
1272/*
1273 * Copy as much as we can into the pages and return the number of bytes which
André Goddard Rosaaf901ca2009-11-14 13:09:05 -02001274 * were successfully copied. If a fault is encountered then clear the pages
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001275 * out to (ofs + bytes) and return the number of bytes which were copied.
1276 */
1277static inline size_t ntfs_copy_from_user(struct page **pages,
1278 unsigned nr_pages, unsigned ofs, const char __user *buf,
1279 size_t bytes)
1280{
1281 struct page **last_page = pages + nr_pages;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001282 char *addr;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001283 size_t total = 0;
1284 unsigned len;
1285 int left;
1286
1287 do {
1288 len = PAGE_CACHE_SIZE - ofs;
1289 if (len > bytes)
1290 len = bytes;
Cong Wanga3ac1412011-11-25 23:14:34 +08001291 addr = kmap_atomic(*pages);
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001292 left = __copy_from_user_inatomic(addr + ofs, buf, len);
Cong Wanga3ac1412011-11-25 23:14:34 +08001293 kunmap_atomic(addr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001294 if (unlikely(left)) {
1295 /* Do it the slow way. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001296 addr = kmap(*pages);
1297 left = __copy_from_user(addr + ofs, buf, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001298 kunmap(*pages);
1299 if (unlikely(left))
1300 goto err_out;
1301 }
1302 total += len;
1303 bytes -= len;
1304 if (!bytes)
1305 break;
1306 buf += len;
1307 ofs = 0;
1308 } while (++pages < last_page);
1309out:
1310 return total;
1311err_out:
1312 total += len - left;
1313 /* Zero the rest of the target like __copy_from_user(). */
1314 while (++pages < last_page) {
1315 bytes -= len;
1316 if (!bytes)
1317 break;
1318 len = PAGE_CACHE_SIZE;
1319 if (len > bytes)
1320 len = bytes;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001321 zero_user(*pages, 0, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001322 }
1323 goto out;
1324}
1325
NeilBrown01408c42006-06-25 05:47:58 -07001326static size_t __ntfs_copy_from_user_iovec_inatomic(char *vaddr,
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001327 const struct iovec *iov, size_t iov_ofs, size_t bytes)
1328{
1329 size_t total = 0;
1330
1331 while (1) {
1332 const char __user *buf = iov->iov_base + iov_ofs;
1333 unsigned len;
1334 size_t left;
1335
1336 len = iov->iov_len - iov_ofs;
1337 if (len > bytes)
1338 len = bytes;
1339 left = __copy_from_user_inatomic(vaddr, buf, len);
1340 total += len;
1341 bytes -= len;
1342 vaddr += len;
1343 if (unlikely(left)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001344 total -= left;
1345 break;
1346 }
1347 if (!bytes)
1348 break;
1349 iov++;
1350 iov_ofs = 0;
1351 }
1352 return total;
1353}
1354
1355static inline void ntfs_set_next_iovec(const struct iovec **iovp,
1356 size_t *iov_ofsp, size_t bytes)
1357{
1358 const struct iovec *iov = *iovp;
1359 size_t iov_ofs = *iov_ofsp;
1360
1361 while (bytes) {
1362 unsigned len;
1363
1364 len = iov->iov_len - iov_ofs;
1365 if (len > bytes)
1366 len = bytes;
1367 bytes -= len;
1368 iov_ofs += len;
1369 if (iov->iov_len == iov_ofs) {
1370 iov++;
1371 iov_ofs = 0;
1372 }
1373 }
1374 *iovp = iov;
1375 *iov_ofsp = iov_ofs;
1376}
1377
1378/*
1379 * This has the same side-effects and return value as ntfs_copy_from_user().
1380 * The difference is that on a fault we need to memset the remainder of the
1381 * pages (out to offset + bytes), to emulate ntfs_copy_from_user()'s
1382 * single-segment behaviour.
1383 *
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001384 * We call the same helper (__ntfs_copy_from_user_iovec_inatomic()) both when
1385 * atomic and when not atomic. This is ok because it calls
1386 * __copy_from_user_inatomic() and it is ok to call this when non-atomic. In
1387 * fact, the only difference between __copy_from_user_inatomic() and
NeilBrown01408c42006-06-25 05:47:58 -07001388 * __copy_from_user() is that the latter calls might_sleep() and the former
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001389 * should not zero the tail of the buffer on error. And on many architectures
1390 * __copy_from_user_inatomic() is just defined to __copy_from_user() so it
1391 * makes no difference at all on those architectures.
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001392 */
1393static inline size_t ntfs_copy_from_user_iovec(struct page **pages,
1394 unsigned nr_pages, unsigned ofs, const struct iovec **iov,
1395 size_t *iov_ofs, size_t bytes)
1396{
1397 struct page **last_page = pages + nr_pages;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001398 char *addr;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001399 size_t copied, len, total = 0;
1400
1401 do {
1402 len = PAGE_CACHE_SIZE - ofs;
1403 if (len > bytes)
1404 len = bytes;
Cong Wanga3ac1412011-11-25 23:14:34 +08001405 addr = kmap_atomic(*pages);
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001406 copied = __ntfs_copy_from_user_iovec_inatomic(addr + ofs,
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001407 *iov, *iov_ofs, len);
Cong Wanga3ac1412011-11-25 23:14:34 +08001408 kunmap_atomic(addr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001409 if (unlikely(copied != len)) {
1410 /* Do it the slow way. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001411 addr = kmap(*pages);
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001412 copied = __ntfs_copy_from_user_iovec_inatomic(addr +
1413 ofs, *iov, *iov_ofs, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001414 if (unlikely(copied != len))
1415 goto err_out;
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001416 kunmap(*pages);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001417 }
1418 total += len;
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001419 ntfs_set_next_iovec(iov, iov_ofs, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001420 bytes -= len;
1421 if (!bytes)
1422 break;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001423 ofs = 0;
1424 } while (++pages < last_page);
1425out:
1426 return total;
1427err_out:
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001428 BUG_ON(copied > len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001429 /* Zero the rest of the target like __copy_from_user(). */
Anton Altaparmakov2818ef52011-01-12 10:34:35 +00001430 memset(addr + ofs + copied, 0, len - copied);
1431 kunmap(*pages);
1432 total += copied;
1433 ntfs_set_next_iovec(iov, iov_ofs, copied);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001434 while (++pages < last_page) {
1435 bytes -= len;
1436 if (!bytes)
1437 break;
1438 len = PAGE_CACHE_SIZE;
1439 if (len > bytes)
1440 len = bytes;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001441 zero_user(*pages, 0, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001442 }
1443 goto out;
1444}
1445
1446static inline void ntfs_flush_dcache_pages(struct page **pages,
1447 unsigned nr_pages)
1448{
1449 BUG_ON(!nr_pages);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001450 /*
1451 * Warning: Do not do the decrement at the same time as the call to
1452 * flush_dcache_page() because it is a NULL macro on i386 and hence the
1453 * decrement never happens so the loop never terminates.
1454 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001455 do {
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001456 --nr_pages;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001457 flush_dcache_page(pages[nr_pages]);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001458 } while (nr_pages > 0);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001459}
1460
1461/**
1462 * ntfs_commit_pages_after_non_resident_write - commit the received data
1463 * @pages: array of destination pages
1464 * @nr_pages: number of pages in @pages
1465 * @pos: byte position in file at which the write begins
1466 * @bytes: number of bytes to be written
1467 *
1468 * See description of ntfs_commit_pages_after_write(), below.
1469 */
1470static inline int ntfs_commit_pages_after_non_resident_write(
1471 struct page **pages, const unsigned nr_pages,
1472 s64 pos, size_t bytes)
1473{
1474 s64 end, initialized_size;
1475 struct inode *vi;
1476 ntfs_inode *ni, *base_ni;
1477 struct buffer_head *bh, *head;
1478 ntfs_attr_search_ctx *ctx;
1479 MFT_RECORD *m;
1480 ATTR_RECORD *a;
1481 unsigned long flags;
1482 unsigned blocksize, u;
1483 int err;
1484
1485 vi = pages[0]->mapping->host;
1486 ni = NTFS_I(vi);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +00001487 blocksize = vi->i_sb->s_blocksize;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001488 end = pos + bytes;
1489 u = 0;
1490 do {
1491 s64 bh_pos;
1492 struct page *page;
Richard Knutssonc49c3112006-09-30 23:27:12 -07001493 bool partial;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001494
1495 page = pages[u];
1496 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
1497 bh = head = page_buffers(page);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001498 partial = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001499 do {
1500 s64 bh_end;
1501
1502 bh_end = bh_pos + blocksize;
1503 if (bh_end <= pos || bh_pos >= end) {
1504 if (!buffer_uptodate(bh))
Richard Knutssonc49c3112006-09-30 23:27:12 -07001505 partial = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001506 } else {
1507 set_buffer_uptodate(bh);
1508 mark_buffer_dirty(bh);
1509 }
1510 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1511 /*
1512 * If all buffers are now uptodate but the page is not, set the
1513 * page uptodate.
1514 */
1515 if (!partial && !PageUptodate(page))
1516 SetPageUptodate(page);
1517 } while (++u < nr_pages);
1518 /*
1519 * Finally, if we do not need to update initialized_size or i_size we
1520 * are finished.
1521 */
1522 read_lock_irqsave(&ni->size_lock, flags);
1523 initialized_size = ni->initialized_size;
1524 read_unlock_irqrestore(&ni->size_lock, flags);
1525 if (end <= initialized_size) {
1526 ntfs_debug("Done.");
1527 return 0;
1528 }
1529 /*
1530 * Update initialized_size/i_size as appropriate, both in the inode and
1531 * the mft record.
1532 */
1533 if (!NInoAttr(ni))
1534 base_ni = ni;
1535 else
1536 base_ni = ni->ext.base_ntfs_ino;
1537 /* Map, pin, and lock the mft record. */
1538 m = map_mft_record(base_ni);
1539 if (IS_ERR(m)) {
1540 err = PTR_ERR(m);
1541 m = NULL;
1542 ctx = NULL;
1543 goto err_out;
1544 }
1545 BUG_ON(!NInoNonResident(ni));
1546 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1547 if (unlikely(!ctx)) {
1548 err = -ENOMEM;
1549 goto err_out;
1550 }
1551 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1552 CASE_SENSITIVE, 0, NULL, 0, ctx);
1553 if (unlikely(err)) {
1554 if (err == -ENOENT)
1555 err = -EIO;
1556 goto err_out;
1557 }
1558 a = ctx->attr;
1559 BUG_ON(!a->non_resident);
1560 write_lock_irqsave(&ni->size_lock, flags);
1561 BUG_ON(end > ni->allocated_size);
1562 ni->initialized_size = end;
1563 a->data.non_resident.initialized_size = cpu_to_sle64(end);
1564 if (end > i_size_read(vi)) {
1565 i_size_write(vi, end);
1566 a->data.non_resident.data_size =
1567 a->data.non_resident.initialized_size;
1568 }
1569 write_unlock_irqrestore(&ni->size_lock, flags);
1570 /* Mark the mft record dirty, so it gets written back. */
1571 flush_dcache_mft_record_page(ctx->ntfs_ino);
1572 mark_mft_record_dirty(ctx->ntfs_ino);
1573 ntfs_attr_put_search_ctx(ctx);
1574 unmap_mft_record(base_ni);
1575 ntfs_debug("Done.");
1576 return 0;
1577err_out:
1578 if (ctx)
1579 ntfs_attr_put_search_ctx(ctx);
1580 if (m)
1581 unmap_mft_record(base_ni);
1582 ntfs_error(vi->i_sb, "Failed to update initialized_size/i_size (error "
1583 "code %i).", err);
Anton Altaparmakovf95c4012006-03-23 15:59:32 +00001584 if (err != -ENOMEM)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001585 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001586 return err;
1587}
1588
1589/**
1590 * ntfs_commit_pages_after_write - commit the received data
1591 * @pages: array of destination pages
1592 * @nr_pages: number of pages in @pages
1593 * @pos: byte position in file at which the write begins
1594 * @bytes: number of bytes to be written
1595 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001596 * This is called from ntfs_file_buffered_write() with i_mutex held on the inode
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001597 * (@pages[0]->mapping->host). There are @nr_pages pages in @pages which are
1598 * locked but not kmap()ped. The source data has already been copied into the
1599 * @page. ntfs_prepare_pages_for_non_resident_write() has been called before
1600 * the data was copied (for non-resident attributes only) and it returned
1601 * success.
1602 *
1603 * Need to set uptodate and mark dirty all buffers within the boundary of the
1604 * write. If all buffers in a page are uptodate we set the page uptodate, too.
1605 *
1606 * Setting the buffers dirty ensures that they get written out later when
1607 * ntfs_writepage() is invoked by the VM.
1608 *
1609 * Finally, we need to update i_size and initialized_size as appropriate both
1610 * in the inode and the mft record.
1611 *
1612 * This is modelled after fs/buffer.c::generic_commit_write(), which marks
1613 * buffers uptodate and dirty, sets the page uptodate if all buffers in the
1614 * page are uptodate, and updates i_size if the end of io is beyond i_size. In
1615 * that case, it also marks the inode dirty.
1616 *
1617 * If things have gone as outlined in
1618 * ntfs_prepare_pages_for_non_resident_write(), we do not need to do any page
1619 * content modifications here for non-resident attributes. For resident
1620 * attributes we need to do the uptodate bringing here which we combine with
1621 * the copying into the mft record which means we save one atomic kmap.
1622 *
1623 * Return 0 on success or -errno on error.
1624 */
1625static int ntfs_commit_pages_after_write(struct page **pages,
1626 const unsigned nr_pages, s64 pos, size_t bytes)
1627{
1628 s64 end, initialized_size;
1629 loff_t i_size;
1630 struct inode *vi;
1631 ntfs_inode *ni, *base_ni;
1632 struct page *page;
1633 ntfs_attr_search_ctx *ctx;
1634 MFT_RECORD *m;
1635 ATTR_RECORD *a;
1636 char *kattr, *kaddr;
1637 unsigned long flags;
1638 u32 attr_len;
1639 int err;
1640
1641 BUG_ON(!nr_pages);
1642 BUG_ON(!pages);
1643 page = pages[0];
1644 BUG_ON(!page);
1645 vi = page->mapping->host;
1646 ni = NTFS_I(vi);
1647 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +01001648 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001649 vi->i_ino, ni->type, page->index, nr_pages,
1650 (long long)pos, bytes);
1651 if (NInoNonResident(ni))
1652 return ntfs_commit_pages_after_non_resident_write(pages,
1653 nr_pages, pos, bytes);
1654 BUG_ON(nr_pages > 1);
1655 /*
1656 * Attribute is resident, implying it is not compressed, encrypted, or
1657 * sparse.
1658 */
1659 if (!NInoAttr(ni))
1660 base_ni = ni;
1661 else
1662 base_ni = ni->ext.base_ntfs_ino;
1663 BUG_ON(NInoNonResident(ni));
1664 /* Map, pin, and lock the mft record. */
1665 m = map_mft_record(base_ni);
1666 if (IS_ERR(m)) {
1667 err = PTR_ERR(m);
1668 m = NULL;
1669 ctx = NULL;
1670 goto err_out;
1671 }
1672 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1673 if (unlikely(!ctx)) {
1674 err = -ENOMEM;
1675 goto err_out;
1676 }
1677 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1678 CASE_SENSITIVE, 0, NULL, 0, ctx);
1679 if (unlikely(err)) {
1680 if (err == -ENOENT)
1681 err = -EIO;
1682 goto err_out;
1683 }
1684 a = ctx->attr;
1685 BUG_ON(a->non_resident);
1686 /* The total length of the attribute value. */
1687 attr_len = le32_to_cpu(a->data.resident.value_length);
1688 i_size = i_size_read(vi);
1689 BUG_ON(attr_len != i_size);
1690 BUG_ON(pos > attr_len);
1691 end = pos + bytes;
1692 BUG_ON(end > le32_to_cpu(a->length) -
1693 le16_to_cpu(a->data.resident.value_offset));
1694 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
Cong Wanga3ac1412011-11-25 23:14:34 +08001695 kaddr = kmap_atomic(page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001696 /* Copy the received data from the page to the mft record. */
1697 memcpy(kattr + pos, kaddr + pos, bytes);
1698 /* Update the attribute length if necessary. */
1699 if (end > attr_len) {
1700 attr_len = end;
1701 a->data.resident.value_length = cpu_to_le32(attr_len);
1702 }
1703 /*
1704 * If the page is not uptodate, bring the out of bounds area(s)
1705 * uptodate by copying data from the mft record to the page.
1706 */
1707 if (!PageUptodate(page)) {
1708 if (pos > 0)
1709 memcpy(kaddr, kattr, pos);
1710 if (end < attr_len)
1711 memcpy(kaddr + end, kattr + end, attr_len - end);
1712 /* Zero the region outside the end of the attribute value. */
1713 memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
1714 flush_dcache_page(page);
1715 SetPageUptodate(page);
1716 }
Cong Wanga3ac1412011-11-25 23:14:34 +08001717 kunmap_atomic(kaddr);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001718 /* Update initialized_size/i_size if necessary. */
1719 read_lock_irqsave(&ni->size_lock, flags);
1720 initialized_size = ni->initialized_size;
1721 BUG_ON(end > ni->allocated_size);
1722 read_unlock_irqrestore(&ni->size_lock, flags);
1723 BUG_ON(initialized_size != i_size);
1724 if (end > initialized_size) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001725 write_lock_irqsave(&ni->size_lock, flags);
1726 ni->initialized_size = end;
1727 i_size_write(vi, end);
1728 write_unlock_irqrestore(&ni->size_lock, flags);
1729 }
1730 /* Mark the mft record dirty, so it gets written back. */
1731 flush_dcache_mft_record_page(ctx->ntfs_ino);
1732 mark_mft_record_dirty(ctx->ntfs_ino);
1733 ntfs_attr_put_search_ctx(ctx);
1734 unmap_mft_record(base_ni);
1735 ntfs_debug("Done.");
1736 return 0;
1737err_out:
1738 if (err == -ENOMEM) {
1739 ntfs_warning(vi->i_sb, "Error allocating memory required to "
1740 "commit the write.");
1741 if (PageUptodate(page)) {
1742 ntfs_warning(vi->i_sb, "Page is uptodate, setting "
1743 "dirty so the write will be retried "
1744 "later on by the VM.");
1745 /*
1746 * Put the page on mapping->dirty_pages, but leave its
1747 * buffers' dirty state as-is.
1748 */
1749 __set_page_dirty_nobuffers(page);
1750 err = 0;
1751 } else
1752 ntfs_error(vi->i_sb, "Page is not uptodate. Written "
1753 "data has been lost.");
1754 } else {
1755 ntfs_error(vi->i_sb, "Resident attribute commit write failed "
1756 "with error %i.", err);
1757 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001758 }
1759 if (ctx)
1760 ntfs_attr_put_search_ctx(ctx);
1761 if (m)
1762 unmap_mft_record(base_ni);
1763 return err;
1764}
1765
Marco Stornelli9014da72012-12-15 11:58:36 +01001766static void ntfs_write_failed(struct address_space *mapping, loff_t to)
1767{
1768 struct inode *inode = mapping->host;
1769
1770 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001771 truncate_pagecache(inode, inode->i_size);
Marco Stornelli9014da72012-12-15 11:58:36 +01001772 ntfs_truncate_vfs(inode);
1773 }
1774}
1775
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001776/**
1777 * ntfs_file_buffered_write -
1778 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001779 * Locking: The vfs is holding ->i_mutex on the inode.
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001780 */
1781static ssize_t ntfs_file_buffered_write(struct kiocb *iocb,
1782 const struct iovec *iov, unsigned long nr_segs,
1783 loff_t pos, loff_t *ppos, size_t count)
1784{
1785 struct file *file = iocb->ki_filp;
1786 struct address_space *mapping = file->f_mapping;
1787 struct inode *vi = mapping->host;
1788 ntfs_inode *ni = NTFS_I(vi);
1789 ntfs_volume *vol = ni->vol;
1790 struct page *pages[NTFS_MAX_PAGES_PER_CLUSTER];
1791 struct page *cached_page = NULL;
1792 char __user *buf = NULL;
1793 s64 end, ll;
1794 VCN last_vcn;
1795 LCN lcn;
1796 unsigned long flags;
Anton Altaparmakovdda65b92005-10-24 08:57:59 +01001797 size_t bytes, iov_ofs = 0; /* Offset in the current iovec. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001798 ssize_t status, written;
1799 unsigned nr_pages;
1800 int err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001801
1802 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
1803 "pos 0x%llx, count 0x%lx.",
1804 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
1805 (unsigned long long)pos, (unsigned long)count);
1806 if (unlikely(!count))
1807 return 0;
1808 BUG_ON(NInoMstProtected(ni));
1809 /*
1810 * If the attribute is not an index root and it is encrypted or
1811 * compressed, we cannot write to it yet. Note we need to check for
1812 * AT_INDEX_ALLOCATION since this is the type of both directory and
1813 * index inodes.
1814 */
1815 if (ni->type != AT_INDEX_ALLOCATION) {
1816 /* If file is encrypted, deny access, just like NT4. */
1817 if (NInoEncrypted(ni)) {
Anton Altaparmakov7d0ffdb2005-10-19 12:21:19 +01001818 /*
1819 * Reminder for later: Encrypted files are _always_
1820 * non-resident so that the content can always be
1821 * encrypted.
1822 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001823 ntfs_debug("Denying write access to encrypted file.");
1824 return -EACCES;
1825 }
1826 if (NInoCompressed(ni)) {
Anton Altaparmakov7d0ffdb2005-10-19 12:21:19 +01001827 /* Only unnamed $DATA attribute can be compressed. */
1828 BUG_ON(ni->type != AT_DATA);
1829 BUG_ON(ni->name_len);
1830 /*
1831 * Reminder for later: If resident, the data is not
1832 * actually compressed. Only on the switch to non-
1833 * resident does compression kick in. This is in
1834 * contrast to encrypted files (see above).
1835 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001836 ntfs_error(vi->i_sb, "Writing to compressed files is "
1837 "not implemented yet. Sorry.");
1838 return -EOPNOTSUPP;
1839 }
1840 }
1841 /*
1842 * If a previous ntfs_truncate() failed, repeat it and abort if it
1843 * fails again.
1844 */
1845 if (unlikely(NInoTruncateFailed(ni))) {
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -04001846 inode_dio_wait(vi);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001847 err = ntfs_truncate(vi);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001848 if (err || NInoTruncateFailed(ni)) {
1849 if (!err)
1850 err = -EIO;
1851 ntfs_error(vol->sb, "Cannot perform write to inode "
1852 "0x%lx, attribute type 0x%x, because "
1853 "ntfs_truncate() failed (error code "
1854 "%i).", vi->i_ino,
1855 (unsigned)le32_to_cpu(ni->type), err);
1856 return err;
1857 }
1858 }
1859 /* The first byte after the write. */
1860 end = pos + count;
1861 /*
1862 * If the write goes beyond the allocated size, extend the allocation
1863 * to cover the whole of the write, rounded up to the nearest cluster.
1864 */
1865 read_lock_irqsave(&ni->size_lock, flags);
1866 ll = ni->allocated_size;
1867 read_unlock_irqrestore(&ni->size_lock, flags);
1868 if (end > ll) {
1869 /* Extend the allocation without changing the data size. */
1870 ll = ntfs_attr_extend_allocation(ni, end, -1, pos);
1871 if (likely(ll >= 0)) {
1872 BUG_ON(pos >= ll);
1873 /* If the extension was partial truncate the write. */
1874 if (end > ll) {
1875 ntfs_debug("Truncating write to inode 0x%lx, "
1876 "attribute type 0x%x, because "
1877 "the allocation was only "
1878 "partially extended.",
1879 vi->i_ino, (unsigned)
1880 le32_to_cpu(ni->type));
1881 end = ll;
1882 count = ll - pos;
1883 }
1884 } else {
1885 err = ll;
1886 read_lock_irqsave(&ni->size_lock, flags);
1887 ll = ni->allocated_size;
1888 read_unlock_irqrestore(&ni->size_lock, flags);
1889 /* Perform a partial write if possible or fail. */
1890 if (pos < ll) {
1891 ntfs_debug("Truncating write to inode 0x%lx, "
1892 "attribute type 0x%x, because "
1893 "extending the allocation "
1894 "failed (error code %i).",
1895 vi->i_ino, (unsigned)
1896 le32_to_cpu(ni->type), err);
1897 end = ll;
1898 count = ll - pos;
1899 } else {
1900 ntfs_error(vol->sb, "Cannot perform write to "
1901 "inode 0x%lx, attribute type "
1902 "0x%x, because extending the "
1903 "allocation failed (error "
1904 "code %i).", vi->i_ino,
1905 (unsigned)
1906 le32_to_cpu(ni->type), err);
1907 return err;
1908 }
1909 }
1910 }
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001911 written = 0;
1912 /*
1913 * If the write starts beyond the initialized size, extend it up to the
1914 * beginning of the write and initialize all non-sparse space between
1915 * the old initialized size and the new one. This automatically also
1916 * increments the vfs inode->i_size to keep it above or equal to the
1917 * initialized_size.
1918 */
1919 read_lock_irqsave(&ni->size_lock, flags);
1920 ll = ni->initialized_size;
1921 read_unlock_irqrestore(&ni->size_lock, flags);
1922 if (pos > ll) {
Minchan Kim2ec93b02010-05-24 14:33:06 -07001923 err = ntfs_attr_extend_initialized(ni, pos);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001924 if (err < 0) {
1925 ntfs_error(vol->sb, "Cannot perform write to inode "
1926 "0x%lx, attribute type 0x%x, because "
1927 "extending the initialized size "
1928 "failed (error code %i).", vi->i_ino,
1929 (unsigned)le32_to_cpu(ni->type), err);
1930 status = err;
1931 goto err_out;
1932 }
1933 }
1934 /*
1935 * Determine the number of pages per cluster for non-resident
1936 * attributes.
1937 */
1938 nr_pages = 1;
1939 if (vol->cluster_size > PAGE_CACHE_SIZE && NInoNonResident(ni))
1940 nr_pages = vol->cluster_size >> PAGE_CACHE_SHIFT;
1941 /* Finally, perform the actual write. */
1942 last_vcn = -1;
1943 if (likely(nr_segs == 1))
1944 buf = iov->iov_base;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001945 do {
1946 VCN vcn;
1947 pgoff_t idx, start_idx;
1948 unsigned ofs, do_pages, u;
1949 size_t copied;
1950
1951 start_idx = idx = pos >> PAGE_CACHE_SHIFT;
1952 ofs = pos & ~PAGE_CACHE_MASK;
1953 bytes = PAGE_CACHE_SIZE - ofs;
1954 do_pages = 1;
1955 if (nr_pages > 1) {
1956 vcn = pos >> vol->cluster_size_bits;
1957 if (vcn != last_vcn) {
1958 last_vcn = vcn;
1959 /*
1960 * Get the lcn of the vcn the write is in. If
1961 * it is a hole, need to lock down all pages in
1962 * the cluster.
1963 */
1964 down_read(&ni->runlist.lock);
1965 lcn = ntfs_attr_vcn_to_lcn_nolock(ni, pos >>
Richard Knutssonc49c3112006-09-30 23:27:12 -07001966 vol->cluster_size_bits, false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001967 up_read(&ni->runlist.lock);
1968 if (unlikely(lcn < LCN_HOLE)) {
1969 status = -EIO;
1970 if (lcn == LCN_ENOMEM)
1971 status = -ENOMEM;
1972 else
1973 ntfs_error(vol->sb, "Cannot "
1974 "perform write to "
1975 "inode 0x%lx, "
1976 "attribute type 0x%x, "
1977 "because the attribute "
1978 "is corrupt.",
1979 vi->i_ino, (unsigned)
1980 le32_to_cpu(ni->type));
1981 break;
1982 }
1983 if (lcn == LCN_HOLE) {
1984 start_idx = (pos & ~(s64)
1985 vol->cluster_size_mask)
1986 >> PAGE_CACHE_SHIFT;
1987 bytes = vol->cluster_size - (pos &
1988 vol->cluster_size_mask);
1989 do_pages = nr_pages;
1990 }
1991 }
1992 }
1993 if (bytes > count)
1994 bytes = count;
1995 /*
1996 * Bring in the user page(s) that we will copy from _first_.
1997 * Otherwise there is a nasty deadlock on copying from the same
1998 * page(s) as we are writing to, without it/them being marked
1999 * up-to-date. Note, at present there is nothing to stop the
2000 * pages being swapped out between us bringing them into memory
2001 * and doing the actual copying.
2002 */
2003 if (likely(nr_segs == 1))
2004 ntfs_fault_in_pages_readable(buf, bytes);
2005 else
2006 ntfs_fault_in_pages_readable_iovec(iov, iov_ofs, bytes);
2007 /* Get and lock @do_pages starting at index @start_idx. */
2008 status = __ntfs_grab_cache_pages(mapping, start_idx, do_pages,
Minchan Kim4c990002010-05-24 14:33:07 -07002009 pages, &cached_page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002010 if (unlikely(status))
2011 break;
2012 /*
2013 * For non-resident attributes, we need to fill any holes with
2014 * actual clusters and ensure all bufferes are mapped. We also
2015 * need to bring uptodate any buffers that are only partially
2016 * being written to.
2017 */
2018 if (NInoNonResident(ni)) {
2019 status = ntfs_prepare_pages_for_non_resident_write(
2020 pages, do_pages, pos, bytes);
2021 if (unlikely(status)) {
2022 loff_t i_size;
2023
2024 do {
2025 unlock_page(pages[--do_pages]);
2026 page_cache_release(pages[do_pages]);
2027 } while (do_pages);
2028 /*
2029 * The write preparation may have instantiated
2030 * allocated space outside i_size. Trim this
2031 * off again. We can ignore any errors in this
2032 * case as we will just be waisting a bit of
2033 * allocated space, which is not a disaster.
2034 */
2035 i_size = i_size_read(vi);
Marco Stornelli9014da72012-12-15 11:58:36 +01002036 if (pos + bytes > i_size) {
2037 ntfs_write_failed(mapping, pos + bytes);
2038 }
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002039 break;
2040 }
2041 }
2042 u = (pos >> PAGE_CACHE_SHIFT) - pages[0]->index;
2043 if (likely(nr_segs == 1)) {
2044 copied = ntfs_copy_from_user(pages + u, do_pages - u,
2045 ofs, buf, bytes);
2046 buf += copied;
2047 } else
2048 copied = ntfs_copy_from_user_iovec(pages + u,
2049 do_pages - u, ofs, &iov, &iov_ofs,
2050 bytes);
2051 ntfs_flush_dcache_pages(pages + u, do_pages - u);
2052 status = ntfs_commit_pages_after_write(pages, do_pages, pos,
2053 bytes);
2054 if (likely(!status)) {
2055 written += copied;
2056 count -= copied;
2057 pos += copied;
2058 if (unlikely(copied != bytes))
2059 status = -EFAULT;
2060 }
2061 do {
2062 unlock_page(pages[--do_pages]);
2063 mark_page_accessed(pages[do_pages]);
2064 page_cache_release(pages[do_pages]);
2065 } while (do_pages);
2066 if (unlikely(status))
2067 break;
2068 balance_dirty_pages_ratelimited(mapping);
2069 cond_resched();
2070 } while (count);
2071err_out:
2072 *ppos = pos;
2073 if (cached_page)
2074 page_cache_release(cached_page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002075 ntfs_debug("Done. Returning %s (written 0x%lx, status %li).",
2076 written ? "written" : "status", (unsigned long)written,
2077 (long)status);
2078 return written ? written : status;
2079}
2080
2081/**
2082 * ntfs_file_aio_write_nolock -
2083 */
2084static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
2085 const struct iovec *iov, unsigned long nr_segs, loff_t *ppos)
2086{
2087 struct file *file = iocb->ki_filp;
2088 struct address_space *mapping = file->f_mapping;
2089 struct inode *inode = mapping->host;
2090 loff_t pos;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002091 size_t count; /* after file limit checks */
2092 ssize_t written, err;
2093
2094 count = 0;
Dmitriy Monakhov0ceb3312007-05-08 00:23:02 -07002095 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
2096 if (err)
2097 return err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002098 pos = *ppos;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002099 /* We can write back this queue in page reclaim. */
2100 current->backing_dev_info = mapping->backing_dev_info;
2101 written = 0;
2102 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
2103 if (err)
2104 goto out;
2105 if (!count)
2106 goto out;
Miklos Szeredi2f1936b2008-06-24 16:50:14 +02002107 err = file_remove_suid(file);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002108 if (err)
2109 goto out;
Josef Bacikc3b2da32012-03-26 09:59:21 -04002110 err = file_update_time(file);
2111 if (err)
2112 goto out;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002113 written = ntfs_file_buffered_write(iocb, iov, nr_segs, pos, ppos,
2114 count);
2115out:
2116 current->backing_dev_info = NULL;
2117 return written ? written : err;
2118}
2119
2120/**
2121 * ntfs_file_aio_write -
2122 */
Badari Pulavarty027445c2006-09-30 23:28:46 -07002123static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
2124 unsigned long nr_segs, loff_t pos)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002125{
2126 struct file *file = iocb->ki_filp;
2127 struct address_space *mapping = file->f_mapping;
2128 struct inode *inode = mapping->host;
2129 ssize_t ret;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002130
2131 BUG_ON(iocb->ki_pos != pos);
2132
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002133 mutex_lock(&inode->i_mutex);
Badari Pulavarty027445c2006-09-30 23:28:46 -07002134 ret = ntfs_file_aio_write_nolock(iocb, iov, nr_segs, &iocb->ki_pos);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002135 mutex_unlock(&inode->i_mutex);
Jan Karaebbbf752009-08-18 18:13:58 +02002136 if (ret > 0) {
Al Virod311d792014-02-09 15:18:09 -05002137 int err = generic_write_sync(file, iocb->ki_pos - ret, ret);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002138 if (err < 0)
2139 ret = err;
2140 }
2141 return ret;
2142}
2143
2144/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 * ntfs_file_fsync - sync a file to disk
2146 * @filp: file to be synced
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 * @datasync: if non-zero only flush user data and not metadata
2148 *
2149 * Data integrity sync of a file to disk. Used for fsync, fdatasync, and msync
2150 * system calls. This function is inspired by fs/buffer.c::file_fsync().
2151 *
2152 * If @datasync is false, write the mft record and all associated extent mft
2153 * records as well as the $DATA attribute and then sync the block device.
2154 *
2155 * If @datasync is true and the attribute is non-resident, we skip the writing
2156 * of the mft record and all associated extent mft records (this might still
2157 * happen due to the write_inode_now() call).
2158 *
2159 * Also, if @datasync is true, we do not wait on the inode to be written out
2160 * but we always wait on the page cache pages to be written out.
2161 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002162 * Locking: Caller must hold i_mutex on the inode.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163 *
2164 * TODO: We should probably also write all attribute/index inodes associated
2165 * with this inode but since we have no simple way of getting to them we ignore
2166 * this problem for now.
2167 */
Josef Bacik02c24a82011-07-16 20:44:56 -04002168static int ntfs_file_fsync(struct file *filp, loff_t start, loff_t end,
2169 int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02002171 struct inode *vi = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172 int err, ret = 0;
2173
2174 ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
Josef Bacik02c24a82011-07-16 20:44:56 -04002175
2176 err = filemap_write_and_wait_range(vi->i_mapping, start, end);
2177 if (err)
2178 return err;
2179 mutex_lock(&vi->i_mutex);
2180
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 BUG_ON(S_ISDIR(vi->i_mode));
2182 if (!datasync || !NInoNonResident(NTFS_I(vi)))
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002183 ret = __ntfs_write_inode(vi, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184 write_inode_now(vi, !datasync);
Anton Altaparmakovf25dfb52005-09-08 20:35:33 +01002185 /*
2186 * NOTE: If we were to use mapping->private_list (see ext2 and
2187 * fs/buffer.c) for dirty blocks then we could optimize the below to be
2188 * sync_mapping_buffers(vi->i_mapping).
2189 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 err = sync_blockdev(vi->i_sb->s_bdev);
2191 if (unlikely(err && !ret))
2192 ret = err;
2193 if (likely(!ret))
2194 ntfs_debug("Done.");
2195 else
2196 ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error "
2197 "%u.", datasync ? "data" : "", vi->i_ino, -ret);
Josef Bacik02c24a82011-07-16 20:44:56 -04002198 mutex_unlock(&vi->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 return ret;
2200}
2201
2202#endif /* NTFS_RW */
2203
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002204const struct file_operations ntfs_file_ops = {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002205 .llseek = generic_file_llseek, /* Seek inside file. */
Badari Pulavarty543ade12006-09-30 23:28:48 -07002206 .read = do_sync_read, /* Read from file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002207 .aio_read = generic_file_aio_read, /* Async read from file. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208#ifdef NTFS_RW
Christoph Hellwig8a9f47d2009-09-22 16:43:58 -07002209 .write = do_sync_write, /* Write to file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002210 .aio_write = ntfs_file_aio_write, /* Async write to file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002211 /*.release = ,*/ /* Last file is closed. See
2212 fs/ext2/file.c::
2213 ext2_release_file() for
2214 how to use this to discard
2215 preallocated space for
2216 write opened files. */
2217 .fsync = ntfs_file_fsync, /* Sync a file to disk. */
2218 /*.aio_fsync = ,*/ /* Sync all outstanding async
2219 i/o operations on a
2220 kiocb. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221#endif /* NTFS_RW */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002222 /*.ioctl = ,*/ /* Perform function on the
2223 mounted filesystem. */
2224 .mmap = generic_file_mmap, /* Mmap file. */
2225 .open = ntfs_file_open, /* Open file. */
Jens Axboe5ffc4ef2007-06-01 11:49:19 +02002226 .splice_read = generic_file_splice_read /* Zero-copy data send with
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002227 the data source being on
2228 the ntfs partition. We do
2229 not need to care about the
2230 data destination. */
2231 /*.sendpage = ,*/ /* Zero-copy data send with
2232 the data destination being
2233 on the ntfs partition. We
2234 do not need to care about
2235 the data source. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236};
2237
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002238const struct inode_operations ntfs_file_inode_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239#ifdef NTFS_RW
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 .setattr = ntfs_setattr,
2241#endif /* NTFS_RW */
2242};
2243
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002244const struct file_operations ntfs_empty_file_ops = {};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002246const struct inode_operations ntfs_empty_inode_ops = {};