blob: 43179ddd336f542e54d198584b8a9e8295ccec9f [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 Altaparmakovbfab36e2007-10-12 09:37:15 +01004 * Copyright (c) 2001-2007 Anton Altaparmakov
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program/include file is distributed in the hope that it will be
12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program (in the main directory of the Linux-NTFS
18 * distribution in the file COPYING); if not, write to the Free Software
19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/buffer_head.h>
Anton Altaparmakov98b27032005-10-11 15:40:40 +010023#include <linux/pagemap.h>
24#include <linux/pagevec.h>
25#include <linux/sched.h>
26#include <linux/swap.h>
27#include <linux/uio.h>
28#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Anton Altaparmakov98b27032005-10-11 15:40:40 +010030#include <asm/page.h>
31#include <asm/uaccess.h>
32
33#include "attrib.h"
34#include "bitmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "inode.h"
36#include "debug.h"
Anton Altaparmakov98b27032005-10-11 15:40:40 +010037#include "lcnalloc.h"
38#include "malloc.h"
39#include "mft.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "ntfs.h"
41
42/**
43 * ntfs_file_open - called when an inode is about to be opened
44 * @vi: inode to be opened
45 * @filp: file structure describing the inode
46 *
47 * Limit file size to the page cache limit on architectures where unsigned long
48 * is 32-bits. This is the most we can do for now without overflowing the page
49 * cache page index. Doing it this way means we don't run into problems because
50 * of existing too large files. It would be better to allow the user to read
51 * the beginning of the file but I doubt very much anyone is going to hit this
52 * check on a 32-bit architecture, so there is no point in adding the extra
53 * complexity required to support this.
54 *
55 * On 64-bit architectures, the check is hopefully optimized away by the
56 * compiler.
57 *
58 * After the check passes, just call generic_file_open() to do its work.
59 */
60static int ntfs_file_open(struct inode *vi, struct file *filp)
61{
62 if (sizeof(unsigned long) < 8) {
Anton Altaparmakovd4b9ba72004-11-17 15:45:08 +000063 if (i_size_read(vi) > MAX_LFS_FILESIZE)
Alan Coxa9c62a12007-10-16 23:30:22 -070064 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 }
66 return generic_file_open(vi, filp);
67}
68
69#ifdef NTFS_RW
70
71/**
Anton Altaparmakov98b27032005-10-11 15:40:40 +010072 * ntfs_attr_extend_initialized - extend the initialized size of an attribute
73 * @ni: ntfs inode of the attribute to extend
74 * @new_init_size: requested new initialized size in bytes
75 * @cached_page: store any allocated but unused page here
76 * @lru_pvec: lru-buffering pagevec of the caller
77 *
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 Altaparmakovdda65b92005-10-24 08:57:59 +0100100 * @cached_page and @lru_pvec are just optimizations for dealing with multiple
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100101 * pages.
102 *
103 * Return 0 on success and -errno on error. In the case that an error is
104 * encountered it is possible that the initialized size will already have been
105 * incremented some way towards @new_init_size but it is guaranteed that if
106 * this is the case, the necessary zeroing will also have happened and that all
107 * metadata is self-consistent.
108 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800109 * Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
Anton Altaparmakovdda65b92005-10-24 08:57:59 +0100110 * held by the caller.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100111 */
112static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size,
113 struct page **cached_page, struct pagevec *lru_pvec)
114{
115 s64 old_init_size;
116 loff_t old_i_size;
117 pgoff_t index, end_index;
118 unsigned long flags;
119 struct inode *vi = VFS_I(ni);
120 ntfs_inode *base_ni;
121 MFT_RECORD *m = NULL;
122 ATTR_RECORD *a;
123 ntfs_attr_search_ctx *ctx = NULL;
124 struct address_space *mapping;
125 struct page *page = NULL;
126 u8 *kattr;
127 int err;
128 u32 attr_len;
129
130 read_lock_irqsave(&ni->size_lock, flags);
131 old_init_size = ni->initialized_size;
132 old_i_size = i_size_read(vi);
133 BUG_ON(new_init_size > ni->allocated_size);
134 read_unlock_irqrestore(&ni->size_lock, flags);
135 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
136 "old_initialized_size 0x%llx, "
137 "new_initialized_size 0x%llx, i_size 0x%llx.",
138 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
139 (unsigned long long)old_init_size,
140 (unsigned long long)new_init_size, old_i_size);
141 if (!NInoAttr(ni))
142 base_ni = ni;
143 else
144 base_ni = ni->ext.base_ntfs_ino;
145 /* Use goto to reduce indentation and we need the label below anyway. */
146 if (NInoNonResident(ni))
147 goto do_non_resident_extend;
148 BUG_ON(old_init_size != old_i_size);
149 m = map_mft_record(base_ni);
150 if (IS_ERR(m)) {
151 err = PTR_ERR(m);
152 m = NULL;
153 goto err_out;
154 }
155 ctx = ntfs_attr_get_search_ctx(base_ni, m);
156 if (unlikely(!ctx)) {
157 err = -ENOMEM;
158 goto err_out;
159 }
160 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
161 CASE_SENSITIVE, 0, NULL, 0, ctx);
162 if (unlikely(err)) {
163 if (err == -ENOENT)
164 err = -EIO;
165 goto err_out;
166 }
167 m = ctx->mrec;
168 a = ctx->attr;
169 BUG_ON(a->non_resident);
170 /* The total length of the attribute value. */
171 attr_len = le32_to_cpu(a->data.resident.value_length);
172 BUG_ON(old_i_size != (loff_t)attr_len);
173 /*
174 * Do the zeroing in the mft record and update the attribute size in
175 * the mft record.
176 */
177 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
178 memset(kattr + attr_len, 0, new_init_size - attr_len);
179 a->data.resident.value_length = cpu_to_le32((u32)new_init_size);
180 /* Finally, update the sizes in the vfs and ntfs inodes. */
181 write_lock_irqsave(&ni->size_lock, flags);
182 i_size_write(vi, new_init_size);
183 ni->initialized_size = new_init_size;
184 write_unlock_irqrestore(&ni->size_lock, flags);
185 goto done;
186do_non_resident_extend:
187 /*
188 * If the new initialized size @new_init_size exceeds the current file
189 * size (vfs inode->i_size), we need to extend the file size to the
190 * new initialized size.
191 */
192 if (new_init_size > old_i_size) {
193 m = map_mft_record(base_ni);
194 if (IS_ERR(m)) {
195 err = PTR_ERR(m);
196 m = NULL;
197 goto err_out;
198 }
199 ctx = ntfs_attr_get_search_ctx(base_ni, m);
200 if (unlikely(!ctx)) {
201 err = -ENOMEM;
202 goto err_out;
203 }
204 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
205 CASE_SENSITIVE, 0, NULL, 0, ctx);
206 if (unlikely(err)) {
207 if (err == -ENOENT)
208 err = -EIO;
209 goto err_out;
210 }
211 m = ctx->mrec;
212 a = ctx->attr;
213 BUG_ON(!a->non_resident);
214 BUG_ON(old_i_size != (loff_t)
215 sle64_to_cpu(a->data.non_resident.data_size));
216 a->data.non_resident.data_size = cpu_to_sle64(new_init_size);
217 flush_dcache_mft_record_page(ctx->ntfs_ino);
218 mark_mft_record_dirty(ctx->ntfs_ino);
219 /* Update the file size in the vfs inode. */
220 i_size_write(vi, new_init_size);
221 ntfs_attr_put_search_ctx(ctx);
222 ctx = NULL;
223 unmap_mft_record(base_ni);
224 m = NULL;
225 }
226 mapping = vi->i_mapping;
227 index = old_init_size >> PAGE_CACHE_SHIFT;
228 end_index = (new_init_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
229 do {
230 /*
231 * Read the page. If the page is not present, this will zero
232 * the uninitialized regions for us.
233 */
Pekka Enberg090d2b12006-06-23 02:05:08 -0700234 page = read_mapping_page(mapping, index, NULL);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100235 if (IS_ERR(page)) {
236 err = PTR_ERR(page);
237 goto init_err_out;
238 }
Nick Piggin6fe69002007-05-06 14:49:04 -0700239 if (unlikely(PageError(page))) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100240 page_cache_release(page);
241 err = -EIO;
242 goto init_err_out;
243 }
244 /*
245 * Update the initialized size in the ntfs inode. This is
246 * enough to make ntfs_writepage() work.
247 */
248 write_lock_irqsave(&ni->size_lock, flags);
Anton Altaparmakov3c6af7f2005-11-24 13:41:33 +0000249 ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100250 if (ni->initialized_size > new_init_size)
251 ni->initialized_size = new_init_size;
252 write_unlock_irqrestore(&ni->size_lock, flags);
253 /* Set the page dirty so it gets written out. */
254 set_page_dirty(page);
255 page_cache_release(page);
256 /*
257 * Play nice with the vm and the rest of the system. This is
258 * very much needed as we can potentially be modifying the
259 * initialised size from a very small value to a really huge
260 * value, e.g.
261 * f = open(somefile, O_TRUNC);
262 * truncate(f, 10GiB);
263 * seek(f, 10GiB);
264 * write(f, 1);
265 * And this would mean we would be marking dirty hundreds of
266 * thousands of pages or as in the above example more than
267 * two and a half million pages!
268 *
269 * TODO: For sparse pages could optimize this workload by using
270 * the FsMisc / MiscFs page bit as a "PageIsSparse" bit. This
271 * would be set in readpage for sparse pages and here we would
272 * not need to mark dirty any pages which have this bit set.
273 * The only caveat is that we have to clear the bit everywhere
274 * where we allocate any clusters that lie in the page or that
275 * contain the page.
276 *
277 * TODO: An even greater optimization would be for us to only
278 * call readpage() on pages which are not in sparse regions as
279 * determined from the runlist. This would greatly reduce the
280 * number of pages we read and make dirty in the case of sparse
281 * files.
282 */
283 balance_dirty_pages_ratelimited(mapping);
284 cond_resched();
285 } while (++index < end_index);
286 read_lock_irqsave(&ni->size_lock, flags);
287 BUG_ON(ni->initialized_size != new_init_size);
288 read_unlock_irqrestore(&ni->size_lock, flags);
289 /* Now bring in sync the initialized_size in the mft record. */
290 m = map_mft_record(base_ni);
291 if (IS_ERR(m)) {
292 err = PTR_ERR(m);
293 m = NULL;
294 goto init_err_out;
295 }
296 ctx = ntfs_attr_get_search_ctx(base_ni, m);
297 if (unlikely(!ctx)) {
298 err = -ENOMEM;
299 goto init_err_out;
300 }
301 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
302 CASE_SENSITIVE, 0, NULL, 0, ctx);
303 if (unlikely(err)) {
304 if (err == -ENOENT)
305 err = -EIO;
306 goto init_err_out;
307 }
308 m = ctx->mrec;
309 a = ctx->attr;
310 BUG_ON(!a->non_resident);
311 a->data.non_resident.initialized_size = cpu_to_sle64(new_init_size);
312done:
313 flush_dcache_mft_record_page(ctx->ntfs_ino);
314 mark_mft_record_dirty(ctx->ntfs_ino);
315 if (ctx)
316 ntfs_attr_put_search_ctx(ctx);
317 if (m)
318 unmap_mft_record(base_ni);
319 ntfs_debug("Done, initialized_size 0x%llx, i_size 0x%llx.",
320 (unsigned long long)new_init_size, i_size_read(vi));
321 return 0;
322init_err_out:
323 write_lock_irqsave(&ni->size_lock, flags);
324 ni->initialized_size = old_init_size;
325 write_unlock_irqrestore(&ni->size_lock, flags);
326err_out:
327 if (ctx)
328 ntfs_attr_put_search_ctx(ctx);
329 if (m)
330 unmap_mft_record(base_ni);
331 ntfs_debug("Failed. Returning error code %i.", err);
332 return err;
333}
334
335/**
336 * ntfs_fault_in_pages_readable -
337 *
338 * Fault a number of userspace pages into pagetables.
339 *
340 * Unlike include/linux/pagemap.h::fault_in_pages_readable(), this one copes
341 * with more than two userspace pages as well as handling the single page case
342 * elegantly.
343 *
344 * If you find this difficult to understand, then think of the while loop being
345 * the following code, except that we do without the integer variable ret:
346 *
347 * do {
348 * ret = __get_user(c, uaddr);
349 * uaddr += PAGE_SIZE;
350 * } while (!ret && uaddr < end);
351 *
352 * Note, the final __get_user() may well run out-of-bounds of the user buffer,
353 * but _not_ out-of-bounds of the page the user buffer belongs to, and since
354 * this is only a read and not a write, and since it is still in the same page,
355 * it should not matter and this makes the code much simpler.
356 */
357static inline void ntfs_fault_in_pages_readable(const char __user *uaddr,
358 int bytes)
359{
360 const char __user *end;
361 volatile char c;
362
363 /* Set @end to the first byte outside the last page we care about. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +0100364 end = (const char __user*)PAGE_ALIGN((unsigned long)uaddr + bytes);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100365
366 while (!__get_user(c, uaddr) && (uaddr += PAGE_SIZE, uaddr < end))
367 ;
368}
369
370/**
371 * ntfs_fault_in_pages_readable_iovec -
372 *
373 * Same as ntfs_fault_in_pages_readable() but operates on an array of iovecs.
374 */
375static inline void ntfs_fault_in_pages_readable_iovec(const struct iovec *iov,
376 size_t iov_ofs, int bytes)
377{
378 do {
379 const char __user *buf;
380 unsigned len;
381
382 buf = iov->iov_base + iov_ofs;
383 len = iov->iov_len - iov_ofs;
384 if (len > bytes)
385 len = bytes;
386 ntfs_fault_in_pages_readable(buf, len);
387 bytes -= len;
388 iov++;
389 iov_ofs = 0;
390 } while (bytes);
391}
392
393/**
394 * __ntfs_grab_cache_pages - obtain a number of locked pages
395 * @mapping: address space mapping from which to obtain page cache pages
396 * @index: starting index in @mapping at which to begin obtaining pages
397 * @nr_pages: number of page cache pages to obtain
398 * @pages: array of pages in which to return the obtained page cache pages
399 * @cached_page: allocated but as yet unused page
400 * @lru_pvec: lru-buffering pagevec of caller
401 *
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200402 * Obtain @nr_pages locked page cache pages from the mapping @mapping and
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100403 * starting at index @index.
404 *
405 * If a page is newly created, increment its refcount and add it to the
406 * caller's lru-buffering pagevec @lru_pvec.
407 *
408 * This is the same as mm/filemap.c::__grab_cache_page(), except that @nr_pages
409 * are obtained at once instead of just one page and that 0 is returned on
410 * success and -errno on error.
411 *
412 * Note, the page locks are obtained in ascending page index order.
413 */
414static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
415 pgoff_t index, const unsigned nr_pages, struct page **pages,
416 struct page **cached_page, struct pagevec *lru_pvec)
417{
418 int err, nr;
419
420 BUG_ON(!nr_pages);
421 err = nr = 0;
422 do {
423 pages[nr] = find_lock_page(mapping, index);
424 if (!pages[nr]) {
425 if (!*cached_page) {
426 *cached_page = page_cache_alloc(mapping);
427 if (unlikely(!*cached_page)) {
428 err = -ENOMEM;
429 goto err_out;
430 }
431 }
432 err = add_to_page_cache(*cached_page, mapping, index,
433 GFP_KERNEL);
434 if (unlikely(err)) {
435 if (err == -EEXIST)
436 continue;
437 goto err_out;
438 }
439 pages[nr] = *cached_page;
440 page_cache_get(*cached_page);
441 if (unlikely(!pagevec_add(lru_pvec, *cached_page)))
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700442 __pagevec_lru_add_file(lru_pvec);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100443 *cached_page = NULL;
444 }
445 index++;
446 nr++;
447 } while (nr < nr_pages);
448out:
449 return err;
450err_out:
451 while (nr > 0) {
452 unlock_page(pages[--nr]);
453 page_cache_release(pages[nr]);
454 }
455 goto out;
456}
457
458static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
459{
460 lock_buffer(bh);
461 get_bh(bh);
462 bh->b_end_io = end_buffer_read_sync;
463 return submit_bh(READ, bh);
464}
465
466/**
467 * ntfs_prepare_pages_for_non_resident_write - prepare pages for receiving data
468 * @pages: array of destination pages
469 * @nr_pages: number of pages in @pages
470 * @pos: byte position in file at which the write begins
471 * @bytes: number of bytes to be written
472 *
473 * This is called for non-resident attributes from ntfs_file_buffered_write()
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800474 * with i_mutex held on the inode (@pages[0]->mapping->host). There are
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100475 * @nr_pages pages in @pages which are locked but not kmap()ped. The source
476 * data has not yet been copied into the @pages.
477 *
478 * Need to fill any holes with actual clusters, allocate buffers if necessary,
479 * ensure all the buffers are mapped, and bring uptodate any buffers that are
480 * only partially being written to.
481 *
482 * If @nr_pages is greater than one, we are guaranteed that the cluster size is
483 * greater than PAGE_CACHE_SIZE, that all pages in @pages are entirely inside
484 * the same cluster and that they are the entirety of that cluster, and that
485 * the cluster is sparse, i.e. we need to allocate a cluster to fill the hole.
486 *
487 * i_size is not to be modified yet.
488 *
489 * Return 0 on success or -errno on error.
490 */
491static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
492 unsigned nr_pages, s64 pos, size_t bytes)
493{
494 VCN vcn, highest_vcn = 0, cpos, cend, bh_cpos, bh_cend;
495 LCN lcn;
496 s64 bh_pos, vcn_len, end, initialized_size;
497 sector_t lcn_block;
498 struct page *page;
499 struct inode *vi;
500 ntfs_inode *ni, *base_ni = NULL;
501 ntfs_volume *vol;
502 runlist_element *rl, *rl2;
503 struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
504 ntfs_attr_search_ctx *ctx = NULL;
505 MFT_RECORD *m = NULL;
506 ATTR_RECORD *a = NULL;
507 unsigned long flags;
508 u32 attr_rec_len = 0;
509 unsigned blocksize, u;
510 int err, mp_size;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700511 bool rl_write_locked, was_hole, is_retry;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100512 unsigned char blocksize_bits;
513 struct {
514 u8 runlist_merged:1;
515 u8 mft_attr_mapped:1;
516 u8 mp_rebuilt:1;
517 u8 attr_switched:1;
518 } status = { 0, 0, 0, 0 };
519
520 BUG_ON(!nr_pages);
521 BUG_ON(!pages);
522 BUG_ON(!*pages);
523 vi = pages[0]->mapping->host;
524 ni = NTFS_I(vi);
525 vol = ni->vol;
526 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +0100527 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100528 vi->i_ino, ni->type, pages[0]->index, nr_pages,
529 (long long)pos, bytes);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +0000530 blocksize = vol->sb->s_blocksize;
531 blocksize_bits = vol->sb->s_blocksize_bits;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100532 u = 0;
533 do {
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +0100534 page = pages[u];
535 BUG_ON(!page);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100536 /*
537 * create_empty_buffers() will create uptodate/dirty buffers if
538 * the page is uptodate/dirty.
539 */
540 if (!page_has_buffers(page)) {
541 create_empty_buffers(page, blocksize, 0);
542 if (unlikely(!page_has_buffers(page)))
543 return -ENOMEM;
544 }
545 } while (++u < nr_pages);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700546 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100547 rl = NULL;
548 err = 0;
549 vcn = lcn = -1;
550 vcn_len = 0;
551 lcn_block = -1;
Richard Knutssonc49c3112006-09-30 23:27:12 -0700552 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100553 cpos = pos >> vol->cluster_size_bits;
554 end = pos + bytes;
555 cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
556 /*
557 * Loop over each page and for each page over each buffer. Use goto to
558 * reduce indentation.
559 */
560 u = 0;
561do_next_page:
562 page = pages[u];
563 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
564 bh = head = page_buffers(page);
565 do {
566 VCN cdelta;
567 s64 bh_end;
568 unsigned bh_cofs;
569
570 /* Clear buffer_new on all buffers to reinitialise state. */
571 if (buffer_new(bh))
572 clear_buffer_new(bh);
573 bh_end = bh_pos + blocksize;
574 bh_cpos = bh_pos >> vol->cluster_size_bits;
575 bh_cofs = bh_pos & vol->cluster_size_mask;
576 if (buffer_mapped(bh)) {
577 /*
578 * The buffer is already mapped. If it is uptodate,
579 * ignore it.
580 */
581 if (buffer_uptodate(bh))
582 continue;
583 /*
584 * The buffer is not uptodate. If the page is uptodate
585 * set the buffer uptodate and otherwise ignore it.
586 */
587 if (PageUptodate(page)) {
588 set_buffer_uptodate(bh);
589 continue;
590 }
591 /*
592 * Neither the page nor the buffer are uptodate. If
593 * the buffer is only partially being written to, we
594 * need to read it in before the write, i.e. now.
595 */
596 if ((bh_pos < pos && bh_end > pos) ||
597 (bh_pos < end && bh_end > end)) {
598 /*
599 * If the buffer is fully or partially within
600 * the initialized size, do an actual read.
601 * Otherwise, simply zero the buffer.
602 */
603 read_lock_irqsave(&ni->size_lock, flags);
604 initialized_size = ni->initialized_size;
605 read_unlock_irqrestore(&ni->size_lock, flags);
606 if (bh_pos < initialized_size) {
607 ntfs_submit_bh_for_read(bh);
608 *wait_bh++ = bh;
609 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800610 zero_user(page, bh_offset(bh),
611 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100612 set_buffer_uptodate(bh);
613 }
614 }
615 continue;
616 }
617 /* Unmapped buffer. Need to map it. */
618 bh->b_bdev = vol->sb->s_bdev;
619 /*
620 * If the current buffer is in the same clusters as the map
621 * cache, there is no need to check the runlist again. The
622 * map cache is made up of @vcn, which is the first cached file
623 * cluster, @vcn_len which is the number of cached file
624 * clusters, @lcn is the device cluster corresponding to @vcn,
625 * and @lcn_block is the block number corresponding to @lcn.
626 */
627 cdelta = bh_cpos - vcn;
628 if (likely(!cdelta || (cdelta > 0 && cdelta < vcn_len))) {
629map_buffer_cached:
630 BUG_ON(lcn < 0);
631 bh->b_blocknr = lcn_block +
632 (cdelta << (vol->cluster_size_bits -
633 blocksize_bits)) +
634 (bh_cofs >> blocksize_bits);
635 set_buffer_mapped(bh);
636 /*
637 * If the page is uptodate so is the buffer. If the
638 * buffer is fully outside the write, we ignore it if
639 * it was already allocated and we mark it dirty so it
640 * gets written out if we allocated it. On the other
641 * hand, if we allocated the buffer but we are not
642 * marking it dirty we set buffer_new so we can do
643 * error recovery.
644 */
645 if (PageUptodate(page)) {
646 if (!buffer_uptodate(bh))
647 set_buffer_uptodate(bh);
648 if (unlikely(was_hole)) {
649 /* We allocated the buffer. */
650 unmap_underlying_metadata(bh->b_bdev,
651 bh->b_blocknr);
652 if (bh_end <= pos || bh_pos >= end)
653 mark_buffer_dirty(bh);
654 else
655 set_buffer_new(bh);
656 }
657 continue;
658 }
659 /* Page is _not_ uptodate. */
660 if (likely(!was_hole)) {
661 /*
662 * Buffer was already allocated. If it is not
663 * uptodate and is only partially being written
664 * to, we need to read it in before the write,
665 * i.e. now.
666 */
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000667 if (!buffer_uptodate(bh) && bh_pos < end &&
668 bh_end > pos &&
669 (bh_pos < pos ||
670 bh_end > end)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100671 /*
672 * If the buffer is fully or partially
673 * within the initialized size, do an
674 * actual read. Otherwise, simply zero
675 * the buffer.
676 */
677 read_lock_irqsave(&ni->size_lock,
678 flags);
679 initialized_size = ni->initialized_size;
680 read_unlock_irqrestore(&ni->size_lock,
681 flags);
682 if (bh_pos < initialized_size) {
683 ntfs_submit_bh_for_read(bh);
684 *wait_bh++ = bh;
685 } else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800686 zero_user(page, bh_offset(bh),
687 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100688 set_buffer_uptodate(bh);
689 }
690 }
691 continue;
692 }
693 /* We allocated the buffer. */
694 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
695 /*
696 * If the buffer is fully outside the write, zero it,
697 * set it uptodate, and mark it dirty so it gets
698 * written out. If it is partially being written to,
699 * zero region surrounding the write but leave it to
700 * commit write to do anything else. Finally, if the
701 * buffer is fully being overwritten, do nothing.
702 */
703 if (bh_end <= pos || bh_pos >= end) {
704 if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800705 zero_user(page, bh_offset(bh),
706 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100707 set_buffer_uptodate(bh);
708 }
709 mark_buffer_dirty(bh);
710 continue;
711 }
712 set_buffer_new(bh);
713 if (!buffer_uptodate(bh) &&
714 (bh_pos < pos || bh_end > end)) {
715 u8 *kaddr;
716 unsigned pofs;
717
718 kaddr = kmap_atomic(page, KM_USER0);
719 if (bh_pos < pos) {
720 pofs = bh_pos & ~PAGE_CACHE_MASK;
721 memset(kaddr + pofs, 0, pos - bh_pos);
722 }
723 if (bh_end > end) {
724 pofs = end & ~PAGE_CACHE_MASK;
725 memset(kaddr + pofs, 0, bh_end - end);
726 }
727 kunmap_atomic(kaddr, KM_USER0);
728 flush_dcache_page(page);
729 }
730 continue;
731 }
732 /*
733 * Slow path: this is the first buffer in the cluster. If it
734 * is outside allocated size and is not uptodate, zero it and
735 * set it uptodate.
736 */
737 read_lock_irqsave(&ni->size_lock, flags);
738 initialized_size = ni->allocated_size;
739 read_unlock_irqrestore(&ni->size_lock, flags);
740 if (bh_pos > initialized_size) {
741 if (PageUptodate(page)) {
742 if (!buffer_uptodate(bh))
743 set_buffer_uptodate(bh);
744 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800745 zero_user(page, bh_offset(bh), blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100746 set_buffer_uptodate(bh);
747 }
748 continue;
749 }
Richard Knutssonc49c3112006-09-30 23:27:12 -0700750 is_retry = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100751 if (!rl) {
752 down_read(&ni->runlist.lock);
753retry_remap:
754 rl = ni->runlist.rl;
755 }
756 if (likely(rl != NULL)) {
757 /* Seek to element containing target cluster. */
758 while (rl->length && rl[1].vcn <= bh_cpos)
759 rl++;
760 lcn = ntfs_rl_vcn_to_lcn(rl, bh_cpos);
761 if (likely(lcn >= 0)) {
762 /*
763 * Successful remap, setup the map cache and
764 * use that to deal with the buffer.
765 */
Richard Knutssonc49c3112006-09-30 23:27:12 -0700766 was_hole = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100767 vcn = bh_cpos;
768 vcn_len = rl[1].vcn - vcn;
769 lcn_block = lcn << (vol->cluster_size_bits -
770 blocksize_bits);
Anton Altaparmakovd5aeaef2005-10-19 12:23:10 +0100771 cdelta = 0;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100772 /*
Anton Altaparmakov3aebf252005-11-01 15:49:31 +0000773 * If the number of remaining clusters touched
774 * by the write is smaller or equal to the
775 * number of cached clusters, unlock the
776 * runlist as the map cache will be used from
777 * now on.
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100778 */
779 if (likely(vcn + vcn_len >= cend)) {
780 if (rl_write_locked) {
781 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700782 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100783 } else
784 up_read(&ni->runlist.lock);
785 rl = NULL;
786 }
787 goto map_buffer_cached;
788 }
789 } else
790 lcn = LCN_RL_NOT_MAPPED;
791 /*
792 * If it is not a hole and not out of bounds, the runlist is
793 * probably unmapped so try to map it now.
794 */
795 if (unlikely(lcn != LCN_HOLE && lcn != LCN_ENOENT)) {
796 if (likely(!is_retry && lcn == LCN_RL_NOT_MAPPED)) {
797 /* Attempt to map runlist. */
798 if (!rl_write_locked) {
799 /*
800 * We need the runlist locked for
801 * writing, so if it is locked for
802 * reading relock it now and retry in
803 * case it changed whilst we dropped
804 * the lock.
805 */
806 up_read(&ni->runlist.lock);
807 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700808 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100809 goto retry_remap;
810 }
811 err = ntfs_map_runlist_nolock(ni, bh_cpos,
812 NULL);
813 if (likely(!err)) {
Richard Knutssonc49c3112006-09-30 23:27:12 -0700814 is_retry = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100815 goto retry_remap;
816 }
817 /*
818 * If @vcn is out of bounds, pretend @lcn is
819 * LCN_ENOENT. As long as the buffer is out
820 * of bounds this will work fine.
821 */
822 if (err == -ENOENT) {
823 lcn = LCN_ENOENT;
824 err = 0;
825 goto rl_not_mapped_enoent;
826 }
827 } else
828 err = -EIO;
829 /* Failed to map the buffer, even after retrying. */
830 bh->b_blocknr = -1;
831 ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
832 "attribute type 0x%x, vcn 0x%llx, "
833 "vcn offset 0x%x, because its "
834 "location on disk could not be "
835 "determined%s (error code %i).",
836 ni->mft_no, ni->type,
837 (unsigned long long)bh_cpos,
838 (unsigned)bh_pos &
839 vol->cluster_size_mask,
840 is_retry ? " even after retrying" : "",
841 err);
842 break;
843 }
844rl_not_mapped_enoent:
845 /*
846 * The buffer is in a hole or out of bounds. We need to fill
847 * the hole, unless the buffer is in a cluster which is not
848 * touched by the write, in which case we just leave the buffer
849 * unmapped. This can only happen when the cluster size is
850 * less than the page cache size.
851 */
852 if (unlikely(vol->cluster_size < PAGE_CACHE_SIZE)) {
853 bh_cend = (bh_end + vol->cluster_size - 1) >>
854 vol->cluster_size_bits;
855 if ((bh_cend <= cpos || bh_cpos >= cend)) {
856 bh->b_blocknr = -1;
857 /*
858 * If the buffer is uptodate we skip it. If it
859 * is not but the page is uptodate, we can set
860 * the buffer uptodate. If the page is not
861 * uptodate, we can clear the buffer and set it
862 * uptodate. Whether this is worthwhile is
863 * debatable and this could be removed.
864 */
865 if (PageUptodate(page)) {
866 if (!buffer_uptodate(bh))
867 set_buffer_uptodate(bh);
868 } else if (!buffer_uptodate(bh)) {
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800869 zero_user(page, bh_offset(bh),
870 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100871 set_buffer_uptodate(bh);
872 }
873 continue;
874 }
875 }
876 /*
877 * Out of bounds buffer is invalid if it was not really out of
878 * bounds.
879 */
880 BUG_ON(lcn != LCN_HOLE);
881 /*
882 * We need the runlist locked for writing, so if it is locked
883 * for reading relock it now and retry in case it changed
884 * whilst we dropped the lock.
885 */
886 BUG_ON(!rl);
887 if (!rl_write_locked) {
888 up_read(&ni->runlist.lock);
889 down_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -0700890 rl_write_locked = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100891 goto retry_remap;
892 }
893 /* Find the previous last allocated cluster. */
894 BUG_ON(rl->lcn != LCN_HOLE);
895 lcn = -1;
896 rl2 = rl;
897 while (--rl2 >= ni->runlist.rl) {
898 if (rl2->lcn >= 0) {
899 lcn = rl2->lcn + rl2->length;
900 break;
901 }
902 }
903 rl2 = ntfs_cluster_alloc(vol, bh_cpos, 1, lcn, DATA_ZONE,
Richard Knutssonc49c3112006-09-30 23:27:12 -0700904 false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100905 if (IS_ERR(rl2)) {
906 err = PTR_ERR(rl2);
907 ntfs_debug("Failed to allocate cluster, error code %i.",
908 err);
909 break;
910 }
911 lcn = rl2->lcn;
912 rl = ntfs_runlists_merge(ni->runlist.rl, rl2);
913 if (IS_ERR(rl)) {
914 err = PTR_ERR(rl);
915 if (err != -ENOMEM)
916 err = -EIO;
917 if (ntfs_cluster_free_from_rl(vol, rl2)) {
918 ntfs_error(vol->sb, "Failed to release "
919 "allocated cluster in error "
920 "code path. Run chkdsk to "
921 "recover the lost cluster.");
922 NVolSetErrors(vol);
923 }
924 ntfs_free(rl2);
925 break;
926 }
927 ni->runlist.rl = rl;
928 status.runlist_merged = 1;
Anton Altaparmakovbb8047d2006-03-07 11:53:46 +0000929 ntfs_debug("Allocated cluster, lcn 0x%llx.",
930 (unsigned long long)lcn);
Anton Altaparmakov98b27032005-10-11 15:40:40 +0100931 /* Map and lock the mft record and get the attribute record. */
932 if (!NInoAttr(ni))
933 base_ni = ni;
934 else
935 base_ni = ni->ext.base_ntfs_ino;
936 m = map_mft_record(base_ni);
937 if (IS_ERR(m)) {
938 err = PTR_ERR(m);
939 break;
940 }
941 ctx = ntfs_attr_get_search_ctx(base_ni, m);
942 if (unlikely(!ctx)) {
943 err = -ENOMEM;
944 unmap_mft_record(base_ni);
945 break;
946 }
947 status.mft_attr_mapped = 1;
948 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
949 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx);
950 if (unlikely(err)) {
951 if (err == -ENOENT)
952 err = -EIO;
953 break;
954 }
955 m = ctx->mrec;
956 a = ctx->attr;
957 /*
958 * Find the runlist element with which the attribute extent
959 * starts. Note, we cannot use the _attr_ version because we
960 * have mapped the mft record. That is ok because we know the
961 * runlist fragment must be mapped already to have ever gotten
962 * here, so we can just use the _rl_ version.
963 */
964 vcn = sle64_to_cpu(a->data.non_resident.lowest_vcn);
965 rl2 = ntfs_rl_find_vcn_nolock(rl, vcn);
966 BUG_ON(!rl2);
967 BUG_ON(!rl2->length);
968 BUG_ON(rl2->lcn < LCN_HOLE);
969 highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
970 /*
971 * If @highest_vcn is zero, calculate the real highest_vcn
972 * (which can really be zero).
973 */
974 if (!highest_vcn)
975 highest_vcn = (sle64_to_cpu(
976 a->data.non_resident.allocated_size) >>
977 vol->cluster_size_bits) - 1;
978 /*
979 * Determine the size of the mapping pairs array for the new
980 * extent, i.e. the old extent with the hole filled.
981 */
982 mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, vcn,
983 highest_vcn);
984 if (unlikely(mp_size <= 0)) {
985 if (!(err = mp_size))
986 err = -EIO;
987 ntfs_debug("Failed to get size for mapping pairs "
988 "array, error code %i.", err);
989 break;
990 }
991 /*
992 * Resize the attribute record to fit the new mapping pairs
993 * array.
994 */
995 attr_rec_len = le32_to_cpu(a->length);
996 err = ntfs_attr_record_resize(m, a, mp_size + le16_to_cpu(
997 a->data.non_resident.mapping_pairs_offset));
998 if (unlikely(err)) {
999 BUG_ON(err != -ENOSPC);
1000 // TODO: Deal with this by using the current attribute
1001 // and fill it with as much of the mapping pairs
1002 // array as possible. Then loop over each attribute
1003 // extent rewriting the mapping pairs arrays as we go
1004 // along and if when we reach the end we have not
1005 // enough space, try to resize the last attribute
1006 // extent and if even that fails, add a new attribute
1007 // extent.
1008 // We could also try to resize at each step in the hope
1009 // that we will not need to rewrite every single extent.
1010 // Note, we may need to decompress some extents to fill
1011 // the runlist as we are walking the extents...
1012 ntfs_error(vol->sb, "Not enough space in the mft "
1013 "record for the extended attribute "
1014 "record. This case is not "
1015 "implemented yet.");
1016 err = -EOPNOTSUPP;
1017 break ;
1018 }
1019 status.mp_rebuilt = 1;
1020 /*
1021 * Generate the mapping pairs array directly into the attribute
1022 * record.
1023 */
1024 err = ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
1025 a->data.non_resident.mapping_pairs_offset),
1026 mp_size, rl2, vcn, highest_vcn, NULL);
1027 if (unlikely(err)) {
1028 ntfs_error(vol->sb, "Cannot fill hole in inode 0x%lx, "
1029 "attribute type 0x%x, because building "
1030 "the mapping pairs failed with error "
1031 "code %i.", vi->i_ino,
1032 (unsigned)le32_to_cpu(ni->type), err);
1033 err = -EIO;
1034 break;
1035 }
1036 /* Update the highest_vcn but only if it was not set. */
1037 if (unlikely(!a->data.non_resident.highest_vcn))
1038 a->data.non_resident.highest_vcn =
1039 cpu_to_sle64(highest_vcn);
1040 /*
1041 * If the attribute is sparse/compressed, update the compressed
1042 * size in the ntfs_inode structure and the attribute record.
1043 */
1044 if (likely(NInoSparse(ni) || NInoCompressed(ni))) {
1045 /*
1046 * If we are not in the first attribute extent, switch
1047 * to it, but first ensure the changes will make it to
1048 * disk later.
1049 */
1050 if (a->data.non_resident.lowest_vcn) {
1051 flush_dcache_mft_record_page(ctx->ntfs_ino);
1052 mark_mft_record_dirty(ctx->ntfs_ino);
1053 ntfs_attr_reinit_search_ctx(ctx);
1054 err = ntfs_attr_lookup(ni->type, ni->name,
1055 ni->name_len, CASE_SENSITIVE,
1056 0, NULL, 0, ctx);
1057 if (unlikely(err)) {
1058 status.attr_switched = 1;
1059 break;
1060 }
1061 /* @m is not used any more so do not set it. */
1062 a = ctx->attr;
1063 }
1064 write_lock_irqsave(&ni->size_lock, flags);
1065 ni->itype.compressed.size += vol->cluster_size;
1066 a->data.non_resident.compressed_size =
1067 cpu_to_sle64(ni->itype.compressed.size);
1068 write_unlock_irqrestore(&ni->size_lock, flags);
1069 }
1070 /* Ensure the changes make it to disk. */
1071 flush_dcache_mft_record_page(ctx->ntfs_ino);
1072 mark_mft_record_dirty(ctx->ntfs_ino);
1073 ntfs_attr_put_search_ctx(ctx);
1074 unmap_mft_record(base_ni);
1075 /* Successfully filled the hole. */
1076 status.runlist_merged = 0;
1077 status.mft_attr_mapped = 0;
1078 status.mp_rebuilt = 0;
1079 /* Setup the map cache and use that to deal with the buffer. */
Richard Knutssonc49c3112006-09-30 23:27:12 -07001080 was_hole = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001081 vcn = bh_cpos;
1082 vcn_len = 1;
1083 lcn_block = lcn << (vol->cluster_size_bits - blocksize_bits);
1084 cdelta = 0;
1085 /*
1086 * If the number of remaining clusters in the @pages is smaller
1087 * or equal to the number of cached clusters, unlock the
1088 * runlist as the map cache will be used from now on.
1089 */
1090 if (likely(vcn + vcn_len >= cend)) {
1091 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001092 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001093 rl = NULL;
1094 }
1095 goto map_buffer_cached;
1096 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1097 /* If there are no errors, do the next page. */
1098 if (likely(!err && ++u < nr_pages))
1099 goto do_next_page;
1100 /* If there are no errors, release the runlist lock if we took it. */
1101 if (likely(!err)) {
1102 if (unlikely(rl_write_locked)) {
1103 up_write(&ni->runlist.lock);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001104 rl_write_locked = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001105 } else if (unlikely(rl))
1106 up_read(&ni->runlist.lock);
1107 rl = NULL;
1108 }
1109 /* If we issued read requests, let them complete. */
1110 read_lock_irqsave(&ni->size_lock, flags);
1111 initialized_size = ni->initialized_size;
1112 read_unlock_irqrestore(&ni->size_lock, flags);
1113 while (wait_bh > wait) {
1114 bh = *--wait_bh;
1115 wait_on_buffer(bh);
1116 if (likely(buffer_uptodate(bh))) {
1117 page = bh->b_page;
1118 bh_pos = ((s64)page->index << PAGE_CACHE_SHIFT) +
1119 bh_offset(bh);
1120 /*
1121 * If the buffer overflows the initialized size, need
1122 * to zero the overflowing region.
1123 */
1124 if (unlikely(bh_pos + blocksize > initialized_size)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001125 int ofs = 0;
1126
1127 if (likely(bh_pos < initialized_size))
1128 ofs = initialized_size - bh_pos;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001129 zero_user_segment(page, bh_offset(bh) + ofs,
1130 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001131 }
1132 } else /* if (unlikely(!buffer_uptodate(bh))) */
1133 err = -EIO;
1134 }
1135 if (likely(!err)) {
1136 /* Clear buffer_new on all buffers. */
1137 u = 0;
1138 do {
1139 bh = head = page_buffers(pages[u]);
1140 do {
1141 if (buffer_new(bh))
1142 clear_buffer_new(bh);
1143 } while ((bh = bh->b_this_page) != head);
1144 } while (++u < nr_pages);
1145 ntfs_debug("Done.");
1146 return err;
1147 }
1148 if (status.attr_switched) {
1149 /* Get back to the attribute extent we modified. */
1150 ntfs_attr_reinit_search_ctx(ctx);
1151 if (ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1152 CASE_SENSITIVE, bh_cpos, NULL, 0, ctx)) {
1153 ntfs_error(vol->sb, "Failed to find required "
1154 "attribute extent of attribute in "
1155 "error code path. Run chkdsk to "
1156 "recover.");
1157 write_lock_irqsave(&ni->size_lock, flags);
1158 ni->itype.compressed.size += vol->cluster_size;
1159 write_unlock_irqrestore(&ni->size_lock, flags);
1160 flush_dcache_mft_record_page(ctx->ntfs_ino);
1161 mark_mft_record_dirty(ctx->ntfs_ino);
1162 /*
1163 * The only thing that is now wrong is the compressed
1164 * size of the base attribute extent which chkdsk
1165 * should be able to fix.
1166 */
1167 NVolSetErrors(vol);
1168 } else {
1169 m = ctx->mrec;
1170 a = ctx->attr;
1171 status.attr_switched = 0;
1172 }
1173 }
1174 /*
1175 * If the runlist has been modified, need to restore it by punching a
1176 * hole into it and we then need to deallocate the on-disk cluster as
1177 * well. Note, we only modify the runlist if we are able to generate a
1178 * new mapping pairs array, i.e. only when the mapped attribute extent
1179 * is not switched.
1180 */
1181 if (status.runlist_merged && !status.attr_switched) {
1182 BUG_ON(!rl_write_locked);
1183 /* Make the file cluster we allocated sparse in the runlist. */
1184 if (ntfs_rl_punch_nolock(vol, &ni->runlist, bh_cpos, 1)) {
1185 ntfs_error(vol->sb, "Failed to punch hole into "
1186 "attribute runlist in error code "
1187 "path. Run chkdsk to recover the "
1188 "lost cluster.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001189 NVolSetErrors(vol);
1190 } else /* if (success) */ {
1191 status.runlist_merged = 0;
1192 /*
1193 * Deallocate the on-disk cluster we allocated but only
1194 * if we succeeded in punching its vcn out of the
1195 * runlist.
1196 */
1197 down_write(&vol->lcnbmp_lock);
1198 if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
1199 ntfs_error(vol->sb, "Failed to release "
1200 "allocated cluster in error "
1201 "code path. Run chkdsk to "
1202 "recover the lost cluster.");
1203 NVolSetErrors(vol);
1204 }
1205 up_write(&vol->lcnbmp_lock);
1206 }
1207 }
1208 /*
1209 * Resize the attribute record to its old size and rebuild the mapping
1210 * pairs array. Note, we only can do this if the runlist has been
1211 * restored to its old state which also implies that the mapped
1212 * attribute extent is not switched.
1213 */
1214 if (status.mp_rebuilt && !status.runlist_merged) {
1215 if (ntfs_attr_record_resize(m, a, attr_rec_len)) {
1216 ntfs_error(vol->sb, "Failed to restore attribute "
1217 "record in error code path. Run "
1218 "chkdsk to recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001219 NVolSetErrors(vol);
1220 } else /* if (success) */ {
1221 if (ntfs_mapping_pairs_build(vol, (u8*)a +
1222 le16_to_cpu(a->data.non_resident.
1223 mapping_pairs_offset), attr_rec_len -
1224 le16_to_cpu(a->data.non_resident.
1225 mapping_pairs_offset), ni->runlist.rl,
1226 vcn, highest_vcn, NULL)) {
1227 ntfs_error(vol->sb, "Failed to restore "
1228 "mapping pairs array in error "
1229 "code path. Run chkdsk to "
1230 "recover.");
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001231 NVolSetErrors(vol);
1232 }
1233 flush_dcache_mft_record_page(ctx->ntfs_ino);
1234 mark_mft_record_dirty(ctx->ntfs_ino);
1235 }
1236 }
1237 /* Release the mft record and the attribute. */
1238 if (status.mft_attr_mapped) {
1239 ntfs_attr_put_search_ctx(ctx);
1240 unmap_mft_record(base_ni);
1241 }
1242 /* Release the runlist lock. */
1243 if (rl_write_locked)
1244 up_write(&ni->runlist.lock);
1245 else if (rl)
1246 up_read(&ni->runlist.lock);
1247 /*
1248 * Zero out any newly allocated blocks to avoid exposing stale data.
1249 * If BH_New is set, we know that the block was newly allocated above
1250 * and that it has not been fully zeroed and marked dirty yet.
1251 */
1252 nr_pages = u;
1253 u = 0;
1254 end = bh_cpos << vol->cluster_size_bits;
1255 do {
1256 page = pages[u];
1257 bh = head = page_buffers(page);
1258 do {
1259 if (u == nr_pages &&
1260 ((s64)page->index << PAGE_CACHE_SHIFT) +
1261 bh_offset(bh) >= end)
1262 break;
1263 if (!buffer_new(bh))
1264 continue;
1265 clear_buffer_new(bh);
1266 if (!buffer_uptodate(bh)) {
1267 if (PageUptodate(page))
1268 set_buffer_uptodate(bh);
1269 else {
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001270 zero_user(page, bh_offset(bh),
1271 blocksize);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001272 set_buffer_uptodate(bh);
1273 }
1274 }
1275 mark_buffer_dirty(bh);
1276 } while ((bh = bh->b_this_page) != head);
1277 } while (++u <= nr_pages);
1278 ntfs_error(vol->sb, "Failed. Returning error code %i.", err);
1279 return err;
1280}
1281
1282/*
1283 * Copy as much as we can into the pages and return the number of bytes which
André Goddard Rosaaf901ca2009-11-14 13:09:05 -02001284 * were successfully copied. If a fault is encountered then clear the pages
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001285 * out to (ofs + bytes) and return the number of bytes which were copied.
1286 */
1287static inline size_t ntfs_copy_from_user(struct page **pages,
1288 unsigned nr_pages, unsigned ofs, const char __user *buf,
1289 size_t bytes)
1290{
1291 struct page **last_page = pages + nr_pages;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001292 char *addr;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001293 size_t total = 0;
1294 unsigned len;
1295 int left;
1296
1297 do {
1298 len = PAGE_CACHE_SIZE - ofs;
1299 if (len > bytes)
1300 len = bytes;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001301 addr = kmap_atomic(*pages, KM_USER0);
1302 left = __copy_from_user_inatomic(addr + ofs, buf, len);
1303 kunmap_atomic(addr, KM_USER0);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001304 if (unlikely(left)) {
1305 /* Do it the slow way. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001306 addr = kmap(*pages);
1307 left = __copy_from_user(addr + ofs, buf, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001308 kunmap(*pages);
1309 if (unlikely(left))
1310 goto err_out;
1311 }
1312 total += len;
1313 bytes -= len;
1314 if (!bytes)
1315 break;
1316 buf += len;
1317 ofs = 0;
1318 } while (++pages < last_page);
1319out:
1320 return total;
1321err_out:
1322 total += len - left;
1323 /* Zero the rest of the target like __copy_from_user(). */
1324 while (++pages < last_page) {
1325 bytes -= len;
1326 if (!bytes)
1327 break;
1328 len = PAGE_CACHE_SIZE;
1329 if (len > bytes)
1330 len = bytes;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001331 zero_user(*pages, 0, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001332 }
1333 goto out;
1334}
1335
NeilBrown01408c42006-06-25 05:47:58 -07001336static size_t __ntfs_copy_from_user_iovec_inatomic(char *vaddr,
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001337 const struct iovec *iov, size_t iov_ofs, size_t bytes)
1338{
1339 size_t total = 0;
1340
1341 while (1) {
1342 const char __user *buf = iov->iov_base + iov_ofs;
1343 unsigned len;
1344 size_t left;
1345
1346 len = iov->iov_len - iov_ofs;
1347 if (len > bytes)
1348 len = bytes;
1349 left = __copy_from_user_inatomic(vaddr, buf, len);
1350 total += len;
1351 bytes -= len;
1352 vaddr += len;
1353 if (unlikely(left)) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001354 total -= left;
1355 break;
1356 }
1357 if (!bytes)
1358 break;
1359 iov++;
1360 iov_ofs = 0;
1361 }
1362 return total;
1363}
1364
1365static inline void ntfs_set_next_iovec(const struct iovec **iovp,
1366 size_t *iov_ofsp, size_t bytes)
1367{
1368 const struct iovec *iov = *iovp;
1369 size_t iov_ofs = *iov_ofsp;
1370
1371 while (bytes) {
1372 unsigned len;
1373
1374 len = iov->iov_len - iov_ofs;
1375 if (len > bytes)
1376 len = bytes;
1377 bytes -= len;
1378 iov_ofs += len;
1379 if (iov->iov_len == iov_ofs) {
1380 iov++;
1381 iov_ofs = 0;
1382 }
1383 }
1384 *iovp = iov;
1385 *iov_ofsp = iov_ofs;
1386}
1387
1388/*
1389 * This has the same side-effects and return value as ntfs_copy_from_user().
1390 * The difference is that on a fault we need to memset the remainder of the
1391 * pages (out to offset + bytes), to emulate ntfs_copy_from_user()'s
1392 * single-segment behaviour.
1393 *
NeilBrown01408c42006-06-25 05:47:58 -07001394 * We call the same helper (__ntfs_copy_from_user_iovec_inatomic()) both
1395 * when atomic and when not atomic. This is ok because
1396 * __ntfs_copy_from_user_iovec_inatomic() calls __copy_from_user_inatomic()
1397 * and it is ok to call this when non-atomic.
1398 * Infact, the only difference between __copy_from_user_inatomic() and
1399 * __copy_from_user() is that the latter calls might_sleep() and the former
1400 * should not zero the tail of the buffer on error. And on many
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001401 * architectures __copy_from_user_inatomic() is just defined to
1402 * __copy_from_user() so it makes no difference at all on those architectures.
1403 */
1404static inline size_t ntfs_copy_from_user_iovec(struct page **pages,
1405 unsigned nr_pages, unsigned ofs, const struct iovec **iov,
1406 size_t *iov_ofs, size_t bytes)
1407{
1408 struct page **last_page = pages + nr_pages;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001409 char *addr;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001410 size_t copied, len, total = 0;
1411
1412 do {
1413 len = PAGE_CACHE_SIZE - ofs;
1414 if (len > bytes)
1415 len = bytes;
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001416 addr = kmap_atomic(*pages, KM_USER0);
1417 copied = __ntfs_copy_from_user_iovec_inatomic(addr + ofs,
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001418 *iov, *iov_ofs, len);
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001419 kunmap_atomic(addr, KM_USER0);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001420 if (unlikely(copied != len)) {
1421 /* Do it the slow way. */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001422 addr = kmap(*pages);
1423 copied = __ntfs_copy_from_user_iovec_inatomic(addr + ofs,
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001424 *iov, *iov_ofs, len);
NeilBrown01408c42006-06-25 05:47:58 -07001425 /*
1426 * Zero the rest of the target like __copy_from_user().
1427 */
Anton Altaparmakovbfab36e2007-10-12 09:37:15 +01001428 memset(addr + ofs + copied, 0, len - copied);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001429 kunmap(*pages);
1430 if (unlikely(copied != len))
1431 goto err_out;
1432 }
1433 total += len;
1434 bytes -= len;
1435 if (!bytes)
1436 break;
1437 ntfs_set_next_iovec(iov, iov_ofs, len);
1438 ofs = 0;
1439 } while (++pages < last_page);
1440out:
1441 return total;
1442err_out:
1443 total += copied;
1444 /* Zero the rest of the target like __copy_from_user(). */
1445 while (++pages < last_page) {
1446 bytes -= len;
1447 if (!bytes)
1448 break;
1449 len = PAGE_CACHE_SIZE;
1450 if (len > bytes)
1451 len = bytes;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08001452 zero_user(*pages, 0, len);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001453 }
1454 goto out;
1455}
1456
1457static inline void ntfs_flush_dcache_pages(struct page **pages,
1458 unsigned nr_pages)
1459{
1460 BUG_ON(!nr_pages);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001461 /*
1462 * Warning: Do not do the decrement at the same time as the call to
1463 * flush_dcache_page() because it is a NULL macro on i386 and hence the
1464 * decrement never happens so the loop never terminates.
1465 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001466 do {
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001467 --nr_pages;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001468 flush_dcache_page(pages[nr_pages]);
Anton Altaparmakovf893afb2006-06-22 14:47:15 -07001469 } while (nr_pages > 0);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001470}
1471
1472/**
1473 * ntfs_commit_pages_after_non_resident_write - commit the received data
1474 * @pages: array of destination pages
1475 * @nr_pages: number of pages in @pages
1476 * @pos: byte position in file at which the write begins
1477 * @bytes: number of bytes to be written
1478 *
1479 * See description of ntfs_commit_pages_after_write(), below.
1480 */
1481static inline int ntfs_commit_pages_after_non_resident_write(
1482 struct page **pages, const unsigned nr_pages,
1483 s64 pos, size_t bytes)
1484{
1485 s64 end, initialized_size;
1486 struct inode *vi;
1487 ntfs_inode *ni, *base_ni;
1488 struct buffer_head *bh, *head;
1489 ntfs_attr_search_ctx *ctx;
1490 MFT_RECORD *m;
1491 ATTR_RECORD *a;
1492 unsigned long flags;
1493 unsigned blocksize, u;
1494 int err;
1495
1496 vi = pages[0]->mapping->host;
1497 ni = NTFS_I(vi);
Anton Altaparmakov78af34f2006-02-24 10:32:33 +00001498 blocksize = vi->i_sb->s_blocksize;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001499 end = pos + bytes;
1500 u = 0;
1501 do {
1502 s64 bh_pos;
1503 struct page *page;
Richard Knutssonc49c3112006-09-30 23:27:12 -07001504 bool partial;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001505
1506 page = pages[u];
1507 bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
1508 bh = head = page_buffers(page);
Richard Knutssonc49c3112006-09-30 23:27:12 -07001509 partial = false;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001510 do {
1511 s64 bh_end;
1512
1513 bh_end = bh_pos + blocksize;
1514 if (bh_end <= pos || bh_pos >= end) {
1515 if (!buffer_uptodate(bh))
Richard Knutssonc49c3112006-09-30 23:27:12 -07001516 partial = true;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001517 } else {
1518 set_buffer_uptodate(bh);
1519 mark_buffer_dirty(bh);
1520 }
1521 } while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
1522 /*
1523 * If all buffers are now uptodate but the page is not, set the
1524 * page uptodate.
1525 */
1526 if (!partial && !PageUptodate(page))
1527 SetPageUptodate(page);
1528 } while (++u < nr_pages);
1529 /*
1530 * Finally, if we do not need to update initialized_size or i_size we
1531 * are finished.
1532 */
1533 read_lock_irqsave(&ni->size_lock, flags);
1534 initialized_size = ni->initialized_size;
1535 read_unlock_irqrestore(&ni->size_lock, flags);
1536 if (end <= initialized_size) {
1537 ntfs_debug("Done.");
1538 return 0;
1539 }
1540 /*
1541 * Update initialized_size/i_size as appropriate, both in the inode and
1542 * the mft record.
1543 */
1544 if (!NInoAttr(ni))
1545 base_ni = ni;
1546 else
1547 base_ni = ni->ext.base_ntfs_ino;
1548 /* Map, pin, and lock the mft record. */
1549 m = map_mft_record(base_ni);
1550 if (IS_ERR(m)) {
1551 err = PTR_ERR(m);
1552 m = NULL;
1553 ctx = NULL;
1554 goto err_out;
1555 }
1556 BUG_ON(!NInoNonResident(ni));
1557 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1558 if (unlikely(!ctx)) {
1559 err = -ENOMEM;
1560 goto err_out;
1561 }
1562 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1563 CASE_SENSITIVE, 0, NULL, 0, ctx);
1564 if (unlikely(err)) {
1565 if (err == -ENOENT)
1566 err = -EIO;
1567 goto err_out;
1568 }
1569 a = ctx->attr;
1570 BUG_ON(!a->non_resident);
1571 write_lock_irqsave(&ni->size_lock, flags);
1572 BUG_ON(end > ni->allocated_size);
1573 ni->initialized_size = end;
1574 a->data.non_resident.initialized_size = cpu_to_sle64(end);
1575 if (end > i_size_read(vi)) {
1576 i_size_write(vi, end);
1577 a->data.non_resident.data_size =
1578 a->data.non_resident.initialized_size;
1579 }
1580 write_unlock_irqrestore(&ni->size_lock, flags);
1581 /* Mark the mft record dirty, so it gets written back. */
1582 flush_dcache_mft_record_page(ctx->ntfs_ino);
1583 mark_mft_record_dirty(ctx->ntfs_ino);
1584 ntfs_attr_put_search_ctx(ctx);
1585 unmap_mft_record(base_ni);
1586 ntfs_debug("Done.");
1587 return 0;
1588err_out:
1589 if (ctx)
1590 ntfs_attr_put_search_ctx(ctx);
1591 if (m)
1592 unmap_mft_record(base_ni);
1593 ntfs_error(vi->i_sb, "Failed to update initialized_size/i_size (error "
1594 "code %i).", err);
Anton Altaparmakovf95c4012006-03-23 15:59:32 +00001595 if (err != -ENOMEM)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001596 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001597 return err;
1598}
1599
1600/**
1601 * ntfs_commit_pages_after_write - commit the received data
1602 * @pages: array of destination pages
1603 * @nr_pages: number of pages in @pages
1604 * @pos: byte position in file at which the write begins
1605 * @bytes: number of bytes to be written
1606 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001607 * This is called from ntfs_file_buffered_write() with i_mutex held on the inode
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001608 * (@pages[0]->mapping->host). There are @nr_pages pages in @pages which are
1609 * locked but not kmap()ped. The source data has already been copied into the
1610 * @page. ntfs_prepare_pages_for_non_resident_write() has been called before
1611 * the data was copied (for non-resident attributes only) and it returned
1612 * success.
1613 *
1614 * Need to set uptodate and mark dirty all buffers within the boundary of the
1615 * write. If all buffers in a page are uptodate we set the page uptodate, too.
1616 *
1617 * Setting the buffers dirty ensures that they get written out later when
1618 * ntfs_writepage() is invoked by the VM.
1619 *
1620 * Finally, we need to update i_size and initialized_size as appropriate both
1621 * in the inode and the mft record.
1622 *
1623 * This is modelled after fs/buffer.c::generic_commit_write(), which marks
1624 * buffers uptodate and dirty, sets the page uptodate if all buffers in the
1625 * page are uptodate, and updates i_size if the end of io is beyond i_size. In
1626 * that case, it also marks the inode dirty.
1627 *
1628 * If things have gone as outlined in
1629 * ntfs_prepare_pages_for_non_resident_write(), we do not need to do any page
1630 * content modifications here for non-resident attributes. For resident
1631 * attributes we need to do the uptodate bringing here which we combine with
1632 * the copying into the mft record which means we save one atomic kmap.
1633 *
1634 * Return 0 on success or -errno on error.
1635 */
1636static int ntfs_commit_pages_after_write(struct page **pages,
1637 const unsigned nr_pages, s64 pos, size_t bytes)
1638{
1639 s64 end, initialized_size;
1640 loff_t i_size;
1641 struct inode *vi;
1642 ntfs_inode *ni, *base_ni;
1643 struct page *page;
1644 ntfs_attr_search_ctx *ctx;
1645 MFT_RECORD *m;
1646 ATTR_RECORD *a;
1647 char *kattr, *kaddr;
1648 unsigned long flags;
1649 u32 attr_len;
1650 int err;
1651
1652 BUG_ON(!nr_pages);
1653 BUG_ON(!pages);
1654 page = pages[0];
1655 BUG_ON(!page);
1656 vi = page->mapping->host;
1657 ni = NTFS_I(vi);
1658 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
Anton Altaparmakovd04bd1f2005-10-24 08:41:24 +01001659 "index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001660 vi->i_ino, ni->type, page->index, nr_pages,
1661 (long long)pos, bytes);
1662 if (NInoNonResident(ni))
1663 return ntfs_commit_pages_after_non_resident_write(pages,
1664 nr_pages, pos, bytes);
1665 BUG_ON(nr_pages > 1);
1666 /*
1667 * Attribute is resident, implying it is not compressed, encrypted, or
1668 * sparse.
1669 */
1670 if (!NInoAttr(ni))
1671 base_ni = ni;
1672 else
1673 base_ni = ni->ext.base_ntfs_ino;
1674 BUG_ON(NInoNonResident(ni));
1675 /* Map, pin, and lock the mft record. */
1676 m = map_mft_record(base_ni);
1677 if (IS_ERR(m)) {
1678 err = PTR_ERR(m);
1679 m = NULL;
1680 ctx = NULL;
1681 goto err_out;
1682 }
1683 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1684 if (unlikely(!ctx)) {
1685 err = -ENOMEM;
1686 goto err_out;
1687 }
1688 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1689 CASE_SENSITIVE, 0, NULL, 0, ctx);
1690 if (unlikely(err)) {
1691 if (err == -ENOENT)
1692 err = -EIO;
1693 goto err_out;
1694 }
1695 a = ctx->attr;
1696 BUG_ON(a->non_resident);
1697 /* The total length of the attribute value. */
1698 attr_len = le32_to_cpu(a->data.resident.value_length);
1699 i_size = i_size_read(vi);
1700 BUG_ON(attr_len != i_size);
1701 BUG_ON(pos > attr_len);
1702 end = pos + bytes;
1703 BUG_ON(end > le32_to_cpu(a->length) -
1704 le16_to_cpu(a->data.resident.value_offset));
1705 kattr = (u8*)a + le16_to_cpu(a->data.resident.value_offset);
1706 kaddr = kmap_atomic(page, KM_USER0);
1707 /* Copy the received data from the page to the mft record. */
1708 memcpy(kattr + pos, kaddr + pos, bytes);
1709 /* Update the attribute length if necessary. */
1710 if (end > attr_len) {
1711 attr_len = end;
1712 a->data.resident.value_length = cpu_to_le32(attr_len);
1713 }
1714 /*
1715 * If the page is not uptodate, bring the out of bounds area(s)
1716 * uptodate by copying data from the mft record to the page.
1717 */
1718 if (!PageUptodate(page)) {
1719 if (pos > 0)
1720 memcpy(kaddr, kattr, pos);
1721 if (end < attr_len)
1722 memcpy(kaddr + end, kattr + end, attr_len - end);
1723 /* Zero the region outside the end of the attribute value. */
1724 memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
1725 flush_dcache_page(page);
1726 SetPageUptodate(page);
1727 }
1728 kunmap_atomic(kaddr, KM_USER0);
1729 /* Update initialized_size/i_size if necessary. */
1730 read_lock_irqsave(&ni->size_lock, flags);
1731 initialized_size = ni->initialized_size;
1732 BUG_ON(end > ni->allocated_size);
1733 read_unlock_irqrestore(&ni->size_lock, flags);
1734 BUG_ON(initialized_size != i_size);
1735 if (end > initialized_size) {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001736 write_lock_irqsave(&ni->size_lock, flags);
1737 ni->initialized_size = end;
1738 i_size_write(vi, end);
1739 write_unlock_irqrestore(&ni->size_lock, flags);
1740 }
1741 /* Mark the mft record dirty, so it gets written back. */
1742 flush_dcache_mft_record_page(ctx->ntfs_ino);
1743 mark_mft_record_dirty(ctx->ntfs_ino);
1744 ntfs_attr_put_search_ctx(ctx);
1745 unmap_mft_record(base_ni);
1746 ntfs_debug("Done.");
1747 return 0;
1748err_out:
1749 if (err == -ENOMEM) {
1750 ntfs_warning(vi->i_sb, "Error allocating memory required to "
1751 "commit the write.");
1752 if (PageUptodate(page)) {
1753 ntfs_warning(vi->i_sb, "Page is uptodate, setting "
1754 "dirty so the write will be retried "
1755 "later on by the VM.");
1756 /*
1757 * Put the page on mapping->dirty_pages, but leave its
1758 * buffers' dirty state as-is.
1759 */
1760 __set_page_dirty_nobuffers(page);
1761 err = 0;
1762 } else
1763 ntfs_error(vi->i_sb, "Page is not uptodate. Written "
1764 "data has been lost.");
1765 } else {
1766 ntfs_error(vi->i_sb, "Resident attribute commit write failed "
1767 "with error %i.", err);
1768 NVolSetErrors(ni->vol);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001769 }
1770 if (ctx)
1771 ntfs_attr_put_search_ctx(ctx);
1772 if (m)
1773 unmap_mft_record(base_ni);
1774 return err;
1775}
1776
1777/**
1778 * ntfs_file_buffered_write -
1779 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001780 * Locking: The vfs is holding ->i_mutex on the inode.
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001781 */
1782static ssize_t ntfs_file_buffered_write(struct kiocb *iocb,
1783 const struct iovec *iov, unsigned long nr_segs,
1784 loff_t pos, loff_t *ppos, size_t count)
1785{
1786 struct file *file = iocb->ki_filp;
1787 struct address_space *mapping = file->f_mapping;
1788 struct inode *vi = mapping->host;
1789 ntfs_inode *ni = NTFS_I(vi);
1790 ntfs_volume *vol = ni->vol;
1791 struct page *pages[NTFS_MAX_PAGES_PER_CLUSTER];
1792 struct page *cached_page = NULL;
1793 char __user *buf = NULL;
1794 s64 end, ll;
1795 VCN last_vcn;
1796 LCN lcn;
1797 unsigned long flags;
Anton Altaparmakovdda65b92005-10-24 08:57:59 +01001798 size_t bytes, iov_ofs = 0; /* Offset in the current iovec. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001799 ssize_t status, written;
1800 unsigned nr_pages;
1801 int err;
1802 struct pagevec lru_pvec;
1803
1804 ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, "
1805 "pos 0x%llx, count 0x%lx.",
1806 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
1807 (unsigned long long)pos, (unsigned long)count);
1808 if (unlikely(!count))
1809 return 0;
1810 BUG_ON(NInoMstProtected(ni));
1811 /*
1812 * If the attribute is not an index root and it is encrypted or
1813 * compressed, we cannot write to it yet. Note we need to check for
1814 * AT_INDEX_ALLOCATION since this is the type of both directory and
1815 * index inodes.
1816 */
1817 if (ni->type != AT_INDEX_ALLOCATION) {
1818 /* If file is encrypted, deny access, just like NT4. */
1819 if (NInoEncrypted(ni)) {
Anton Altaparmakov7d0ffdb2005-10-19 12:21:19 +01001820 /*
1821 * Reminder for later: Encrypted files are _always_
1822 * non-resident so that the content can always be
1823 * encrypted.
1824 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001825 ntfs_debug("Denying write access to encrypted file.");
1826 return -EACCES;
1827 }
1828 if (NInoCompressed(ni)) {
Anton Altaparmakov7d0ffdb2005-10-19 12:21:19 +01001829 /* Only unnamed $DATA attribute can be compressed. */
1830 BUG_ON(ni->type != AT_DATA);
1831 BUG_ON(ni->name_len);
1832 /*
1833 * Reminder for later: If resident, the data is not
1834 * actually compressed. Only on the switch to non-
1835 * resident does compression kick in. This is in
1836 * contrast to encrypted files (see above).
1837 */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001838 ntfs_error(vi->i_sb, "Writing to compressed files is "
1839 "not implemented yet. Sorry.");
1840 return -EOPNOTSUPP;
1841 }
1842 }
1843 /*
1844 * If a previous ntfs_truncate() failed, repeat it and abort if it
1845 * fails again.
1846 */
1847 if (unlikely(NInoTruncateFailed(ni))) {
1848 down_write(&vi->i_alloc_sem);
1849 err = ntfs_truncate(vi);
1850 up_write(&vi->i_alloc_sem);
1851 if (err || NInoTruncateFailed(ni)) {
1852 if (!err)
1853 err = -EIO;
1854 ntfs_error(vol->sb, "Cannot perform write to inode "
1855 "0x%lx, attribute type 0x%x, because "
1856 "ntfs_truncate() failed (error code "
1857 "%i).", vi->i_ino,
1858 (unsigned)le32_to_cpu(ni->type), err);
1859 return err;
1860 }
1861 }
1862 /* The first byte after the write. */
1863 end = pos + count;
1864 /*
1865 * If the write goes beyond the allocated size, extend the allocation
1866 * to cover the whole of the write, rounded up to the nearest cluster.
1867 */
1868 read_lock_irqsave(&ni->size_lock, flags);
1869 ll = ni->allocated_size;
1870 read_unlock_irqrestore(&ni->size_lock, flags);
1871 if (end > ll) {
1872 /* Extend the allocation without changing the data size. */
1873 ll = ntfs_attr_extend_allocation(ni, end, -1, pos);
1874 if (likely(ll >= 0)) {
1875 BUG_ON(pos >= ll);
1876 /* If the extension was partial truncate the write. */
1877 if (end > ll) {
1878 ntfs_debug("Truncating write to inode 0x%lx, "
1879 "attribute type 0x%x, because "
1880 "the allocation was only "
1881 "partially extended.",
1882 vi->i_ino, (unsigned)
1883 le32_to_cpu(ni->type));
1884 end = ll;
1885 count = ll - pos;
1886 }
1887 } else {
1888 err = ll;
1889 read_lock_irqsave(&ni->size_lock, flags);
1890 ll = ni->allocated_size;
1891 read_unlock_irqrestore(&ni->size_lock, flags);
1892 /* Perform a partial write if possible or fail. */
1893 if (pos < ll) {
1894 ntfs_debug("Truncating write to inode 0x%lx, "
1895 "attribute type 0x%x, because "
1896 "extending the allocation "
1897 "failed (error code %i).",
1898 vi->i_ino, (unsigned)
1899 le32_to_cpu(ni->type), err);
1900 end = ll;
1901 count = ll - pos;
1902 } else {
1903 ntfs_error(vol->sb, "Cannot perform write to "
1904 "inode 0x%lx, attribute type "
1905 "0x%x, because extending the "
1906 "allocation failed (error "
1907 "code %i).", vi->i_ino,
1908 (unsigned)
1909 le32_to_cpu(ni->type), err);
1910 return err;
1911 }
1912 }
1913 }
1914 pagevec_init(&lru_pvec, 0);
1915 written = 0;
1916 /*
1917 * If the write starts beyond the initialized size, extend it up to the
1918 * beginning of the write and initialize all non-sparse space between
1919 * the old initialized size and the new one. This automatically also
1920 * increments the vfs inode->i_size to keep it above or equal to the
1921 * initialized_size.
1922 */
1923 read_lock_irqsave(&ni->size_lock, flags);
1924 ll = ni->initialized_size;
1925 read_unlock_irqrestore(&ni->size_lock, flags);
1926 if (pos > ll) {
1927 err = ntfs_attr_extend_initialized(ni, pos, &cached_page,
1928 &lru_pvec);
1929 if (err < 0) {
1930 ntfs_error(vol->sb, "Cannot perform write to inode "
1931 "0x%lx, attribute type 0x%x, because "
1932 "extending the initialized size "
1933 "failed (error code %i).", vi->i_ino,
1934 (unsigned)le32_to_cpu(ni->type), err);
1935 status = err;
1936 goto err_out;
1937 }
1938 }
1939 /*
1940 * Determine the number of pages per cluster for non-resident
1941 * attributes.
1942 */
1943 nr_pages = 1;
1944 if (vol->cluster_size > PAGE_CACHE_SIZE && NInoNonResident(ni))
1945 nr_pages = vol->cluster_size >> PAGE_CACHE_SHIFT;
1946 /* Finally, perform the actual write. */
1947 last_vcn = -1;
1948 if (likely(nr_segs == 1))
1949 buf = iov->iov_base;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001950 do {
1951 VCN vcn;
1952 pgoff_t idx, start_idx;
1953 unsigned ofs, do_pages, u;
1954 size_t copied;
1955
1956 start_idx = idx = pos >> PAGE_CACHE_SHIFT;
1957 ofs = pos & ~PAGE_CACHE_MASK;
1958 bytes = PAGE_CACHE_SIZE - ofs;
1959 do_pages = 1;
1960 if (nr_pages > 1) {
1961 vcn = pos >> vol->cluster_size_bits;
1962 if (vcn != last_vcn) {
1963 last_vcn = vcn;
1964 /*
1965 * Get the lcn of the vcn the write is in. If
1966 * it is a hole, need to lock down all pages in
1967 * the cluster.
1968 */
1969 down_read(&ni->runlist.lock);
1970 lcn = ntfs_attr_vcn_to_lcn_nolock(ni, pos >>
Richard Knutssonc49c3112006-09-30 23:27:12 -07001971 vol->cluster_size_bits, false);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01001972 up_read(&ni->runlist.lock);
1973 if (unlikely(lcn < LCN_HOLE)) {
1974 status = -EIO;
1975 if (lcn == LCN_ENOMEM)
1976 status = -ENOMEM;
1977 else
1978 ntfs_error(vol->sb, "Cannot "
1979 "perform write to "
1980 "inode 0x%lx, "
1981 "attribute type 0x%x, "
1982 "because the attribute "
1983 "is corrupt.",
1984 vi->i_ino, (unsigned)
1985 le32_to_cpu(ni->type));
1986 break;
1987 }
1988 if (lcn == LCN_HOLE) {
1989 start_idx = (pos & ~(s64)
1990 vol->cluster_size_mask)
1991 >> PAGE_CACHE_SHIFT;
1992 bytes = vol->cluster_size - (pos &
1993 vol->cluster_size_mask);
1994 do_pages = nr_pages;
1995 }
1996 }
1997 }
1998 if (bytes > count)
1999 bytes = count;
2000 /*
2001 * Bring in the user page(s) that we will copy from _first_.
2002 * Otherwise there is a nasty deadlock on copying from the same
2003 * page(s) as we are writing to, without it/them being marked
2004 * up-to-date. Note, at present there is nothing to stop the
2005 * pages being swapped out between us bringing them into memory
2006 * and doing the actual copying.
2007 */
2008 if (likely(nr_segs == 1))
2009 ntfs_fault_in_pages_readable(buf, bytes);
2010 else
2011 ntfs_fault_in_pages_readable_iovec(iov, iov_ofs, bytes);
2012 /* Get and lock @do_pages starting at index @start_idx. */
2013 status = __ntfs_grab_cache_pages(mapping, start_idx, do_pages,
2014 pages, &cached_page, &lru_pvec);
2015 if (unlikely(status))
2016 break;
2017 /*
2018 * For non-resident attributes, we need to fill any holes with
2019 * actual clusters and ensure all bufferes are mapped. We also
2020 * need to bring uptodate any buffers that are only partially
2021 * being written to.
2022 */
2023 if (NInoNonResident(ni)) {
2024 status = ntfs_prepare_pages_for_non_resident_write(
2025 pages, do_pages, pos, bytes);
2026 if (unlikely(status)) {
2027 loff_t i_size;
2028
2029 do {
2030 unlock_page(pages[--do_pages]);
2031 page_cache_release(pages[do_pages]);
2032 } while (do_pages);
2033 /*
2034 * The write preparation may have instantiated
2035 * allocated space outside i_size. Trim this
2036 * off again. We can ignore any errors in this
2037 * case as we will just be waisting a bit of
2038 * allocated space, which is not a disaster.
2039 */
2040 i_size = i_size_read(vi);
2041 if (pos + bytes > i_size)
2042 vmtruncate(vi, i_size);
2043 break;
2044 }
2045 }
2046 u = (pos >> PAGE_CACHE_SHIFT) - pages[0]->index;
2047 if (likely(nr_segs == 1)) {
2048 copied = ntfs_copy_from_user(pages + u, do_pages - u,
2049 ofs, buf, bytes);
2050 buf += copied;
2051 } else
2052 copied = ntfs_copy_from_user_iovec(pages + u,
2053 do_pages - u, ofs, &iov, &iov_ofs,
2054 bytes);
2055 ntfs_flush_dcache_pages(pages + u, do_pages - u);
2056 status = ntfs_commit_pages_after_write(pages, do_pages, pos,
2057 bytes);
2058 if (likely(!status)) {
2059 written += copied;
2060 count -= copied;
2061 pos += copied;
2062 if (unlikely(copied != bytes))
2063 status = -EFAULT;
2064 }
2065 do {
2066 unlock_page(pages[--do_pages]);
2067 mark_page_accessed(pages[do_pages]);
2068 page_cache_release(pages[do_pages]);
2069 } while (do_pages);
2070 if (unlikely(status))
2071 break;
2072 balance_dirty_pages_ratelimited(mapping);
2073 cond_resched();
2074 } while (count);
2075err_out:
2076 *ppos = pos;
2077 if (cached_page)
2078 page_cache_release(cached_page);
Rik van Riel4f98a2f2008-10-18 20:26:32 -07002079 pagevec_lru_add_file(&lru_pvec);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002080 ntfs_debug("Done. Returning %s (written 0x%lx, status %li).",
2081 written ? "written" : "status", (unsigned long)written,
2082 (long)status);
2083 return written ? written : status;
2084}
2085
2086/**
2087 * ntfs_file_aio_write_nolock -
2088 */
2089static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb,
2090 const struct iovec *iov, unsigned long nr_segs, loff_t *ppos)
2091{
2092 struct file *file = iocb->ki_filp;
2093 struct address_space *mapping = file->f_mapping;
2094 struct inode *inode = mapping->host;
2095 loff_t pos;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002096 size_t count; /* after file limit checks */
2097 ssize_t written, err;
2098
2099 count = 0;
Dmitriy Monakhov0ceb3312007-05-08 00:23:02 -07002100 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
2101 if (err)
2102 return err;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002103 pos = *ppos;
2104 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
2105 /* We can write back this queue in page reclaim. */
2106 current->backing_dev_info = mapping->backing_dev_info;
2107 written = 0;
2108 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
2109 if (err)
2110 goto out;
2111 if (!count)
2112 goto out;
Miklos Szeredi2f1936b2008-06-24 16:50:14 +02002113 err = file_remove_suid(file);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002114 if (err)
2115 goto out;
Christoph Hellwig870f4812006-01-09 20:52:01 -08002116 file_update_time(file);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002117 written = ntfs_file_buffered_write(iocb, iov, nr_segs, pos, ppos,
2118 count);
2119out:
2120 current->backing_dev_info = NULL;
2121 return written ? written : err;
2122}
2123
2124/**
2125 * ntfs_file_aio_write -
2126 */
Badari Pulavarty027445c2006-09-30 23:28:46 -07002127static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
2128 unsigned long nr_segs, loff_t pos)
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002129{
2130 struct file *file = iocb->ki_filp;
2131 struct address_space *mapping = file->f_mapping;
2132 struct inode *inode = mapping->host;
2133 ssize_t ret;
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002134
2135 BUG_ON(iocb->ki_pos != pos);
2136
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002137 mutex_lock(&inode->i_mutex);
Badari Pulavarty027445c2006-09-30 23:28:46 -07002138 ret = ntfs_file_aio_write_nolock(iocb, iov, nr_segs, &iocb->ki_pos);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002139 mutex_unlock(&inode->i_mutex);
Jan Karaebbbf752009-08-18 18:13:58 +02002140 if (ret > 0) {
2141 int err = generic_write_sync(file, pos, ret);
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002142 if (err < 0)
2143 ret = err;
2144 }
2145 return ret;
2146}
2147
2148/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 * ntfs_file_fsync - sync a file to disk
2150 * @filp: file to be synced
2151 * @dentry: dentry describing the file to sync
2152 * @datasync: if non-zero only flush user data and not metadata
2153 *
2154 * Data integrity sync of a file to disk. Used for fsync, fdatasync, and msync
2155 * system calls. This function is inspired by fs/buffer.c::file_fsync().
2156 *
2157 * If @datasync is false, write the mft record and all associated extent mft
2158 * records as well as the $DATA attribute and then sync the block device.
2159 *
2160 * If @datasync is true and the attribute is non-resident, we skip the writing
2161 * of the mft record and all associated extent mft records (this might still
2162 * happen due to the write_inode_now() call).
2163 *
2164 * Also, if @datasync is true, we do not wait on the inode to be written out
2165 * but we always wait on the page cache pages to be written out.
2166 *
2167 * Note: In the past @filp could be NULL so we ignore it as we don't need it
2168 * anyway.
2169 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002170 * Locking: Caller must hold i_mutex on the inode.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 *
2172 * TODO: We should probably also write all attribute/index inodes associated
2173 * with this inode but since we have no simple way of getting to them we ignore
2174 * this problem for now.
2175 */
2176static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
2177 int datasync)
2178{
2179 struct inode *vi = dentry->d_inode;
2180 int err, ret = 0;
2181
2182 ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
2183 BUG_ON(S_ISDIR(vi->i_mode));
2184 if (!datasync || !NInoNonResident(NTFS_I(vi)))
2185 ret = ntfs_write_inode(vi, 1);
2186 write_inode_now(vi, !datasync);
Anton Altaparmakovf25dfb52005-09-08 20:35:33 +01002187 /*
2188 * NOTE: If we were to use mapping->private_list (see ext2 and
2189 * fs/buffer.c) for dirty blocks then we could optimize the below to be
2190 * sync_mapping_buffers(vi->i_mapping).
2191 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192 err = sync_blockdev(vi->i_sb->s_bdev);
2193 if (unlikely(err && !ret))
2194 ret = err;
2195 if (likely(!ret))
2196 ntfs_debug("Done.");
2197 else
2198 ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error "
2199 "%u.", datasync ? "data" : "", vi->i_ino, -ret);
2200 return ret;
2201}
2202
2203#endif /* NTFS_RW */
2204
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002205const struct file_operations ntfs_file_ops = {
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002206 .llseek = generic_file_llseek, /* Seek inside file. */
Badari Pulavarty543ade12006-09-30 23:28:48 -07002207 .read = do_sync_read, /* Read from file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002208 .aio_read = generic_file_aio_read, /* Async read from file. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209#ifdef NTFS_RW
Christoph Hellwig8a9f47d2009-09-22 16:43:58 -07002210 .write = do_sync_write, /* Write to file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002211 .aio_write = ntfs_file_aio_write, /* Async write to file. */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002212 /*.release = ,*/ /* Last file is closed. See
2213 fs/ext2/file.c::
2214 ext2_release_file() for
2215 how to use this to discard
2216 preallocated space for
2217 write opened files. */
2218 .fsync = ntfs_file_fsync, /* Sync a file to disk. */
2219 /*.aio_fsync = ,*/ /* Sync all outstanding async
2220 i/o operations on a
2221 kiocb. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222#endif /* NTFS_RW */
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002223 /*.ioctl = ,*/ /* Perform function on the
2224 mounted filesystem. */
2225 .mmap = generic_file_mmap, /* Mmap file. */
2226 .open = ntfs_file_open, /* Open file. */
Jens Axboe5ffc4ef2007-06-01 11:49:19 +02002227 .splice_read = generic_file_splice_read /* Zero-copy data send with
Anton Altaparmakov98b27032005-10-11 15:40:40 +01002228 the data source being on
2229 the ntfs partition. We do
2230 not need to care about the
2231 data destination. */
2232 /*.sendpage = ,*/ /* Zero-copy data send with
2233 the data destination being
2234 on the ntfs partition. We
2235 do not need to care about
2236 the data source. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237};
2238
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002239const struct inode_operations ntfs_file_inode_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240#ifdef NTFS_RW
2241 .truncate = ntfs_truncate_vfs,
2242 .setattr = ntfs_setattr,
2243#endif /* NTFS_RW */
2244};
2245
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002246const struct file_operations ntfs_empty_file_ops = {};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002248const struct inode_operations ntfs_empty_inode_ops = {};