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[thirdparty/kernel/stable.git] / fs / f2fs / file.c
1 /*
2 * fs/f2fs/file.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/stat.h>
14 #include <linux/buffer_head.h>
15 #include <linux/writeback.h>
16 #include <linux/blkdev.h>
17 #include <linux/falloc.h>
18 #include <linux/types.h>
19 #include <linux/compat.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22 #include <linux/pagevec.h>
23 #include <linux/random.h>
24
25 #include "f2fs.h"
26 #include "node.h"
27 #include "segment.h"
28 #include "xattr.h"
29 #include "acl.h"
30 #include "gc.h"
31 #include "trace.h"
32 #include <trace/events/f2fs.h>
33
34 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
35 struct vm_fault *vmf)
36 {
37 struct page *page = vmf->page;
38 struct inode *inode = file_inode(vma->vm_file);
39 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
40 struct dnode_of_data dn;
41 int err;
42
43 f2fs_balance_fs(sbi);
44
45 sb_start_pagefault(inode->i_sb);
46
47 f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
48
49 /* block allocation */
50 f2fs_lock_op(sbi);
51 set_new_dnode(&dn, inode, NULL, NULL, 0);
52 err = f2fs_reserve_block(&dn, page->index);
53 if (err) {
54 f2fs_unlock_op(sbi);
55 goto out;
56 }
57 f2fs_put_dnode(&dn);
58 f2fs_unlock_op(sbi);
59
60 file_update_time(vma->vm_file);
61 lock_page(page);
62 if (unlikely(page->mapping != inode->i_mapping ||
63 page_offset(page) > i_size_read(inode) ||
64 !PageUptodate(page))) {
65 unlock_page(page);
66 err = -EFAULT;
67 goto out;
68 }
69
70 /*
71 * check to see if the page is mapped already (no holes)
72 */
73 if (PageMappedToDisk(page))
74 goto mapped;
75
76 /* page is wholly or partially inside EOF */
77 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
78 unsigned offset;
79 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
80 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
81 }
82 set_page_dirty(page);
83 SetPageUptodate(page);
84
85 trace_f2fs_vm_page_mkwrite(page, DATA);
86 mapped:
87 /* fill the page */
88 f2fs_wait_on_page_writeback(page, DATA);
89 /* if gced page is attached, don't write to cold segment */
90 clear_cold_data(page);
91 out:
92 sb_end_pagefault(inode->i_sb);
93 return block_page_mkwrite_return(err);
94 }
95
96 static const struct vm_operations_struct f2fs_file_vm_ops = {
97 .fault = filemap_fault,
98 .map_pages = filemap_map_pages,
99 .page_mkwrite = f2fs_vm_page_mkwrite,
100 };
101
102 static int get_parent_ino(struct inode *inode, nid_t *pino)
103 {
104 struct dentry *dentry;
105
106 inode = igrab(inode);
107 dentry = d_find_any_alias(inode);
108 iput(inode);
109 if (!dentry)
110 return 0;
111
112 if (update_dent_inode(inode, inode, &dentry->d_name)) {
113 dput(dentry);
114 return 0;
115 }
116
117 *pino = parent_ino(dentry);
118 dput(dentry);
119 return 1;
120 }
121
122 static inline bool need_do_checkpoint(struct inode *inode)
123 {
124 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
125 bool need_cp = false;
126
127 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
128 need_cp = true;
129 else if (file_enc_name(inode) && need_dentry_mark(sbi, inode->i_ino))
130 need_cp = true;
131 else if (file_wrong_pino(inode))
132 need_cp = true;
133 else if (!space_for_roll_forward(sbi))
134 need_cp = true;
135 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
136 need_cp = true;
137 else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
138 need_cp = true;
139 else if (test_opt(sbi, FASTBOOT))
140 need_cp = true;
141 else if (sbi->active_logs == 2)
142 need_cp = true;
143
144 return need_cp;
145 }
146
147 static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
148 {
149 struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
150 bool ret = false;
151 /* But we need to avoid that there are some inode updates */
152 if ((i && PageDirty(i)) || need_inode_block_update(sbi, ino))
153 ret = true;
154 f2fs_put_page(i, 0);
155 return ret;
156 }
157
158 static void try_to_fix_pino(struct inode *inode)
159 {
160 struct f2fs_inode_info *fi = F2FS_I(inode);
161 nid_t pino;
162
163 down_write(&fi->i_sem);
164 fi->xattr_ver = 0;
165 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
166 get_parent_ino(inode, &pino)) {
167 fi->i_pino = pino;
168 file_got_pino(inode);
169 up_write(&fi->i_sem);
170
171 mark_inode_dirty_sync(inode);
172 f2fs_write_inode(inode, NULL);
173 } else {
174 up_write(&fi->i_sem);
175 }
176 }
177
178 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
179 {
180 struct inode *inode = file->f_mapping->host;
181 struct f2fs_inode_info *fi = F2FS_I(inode);
182 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
183 nid_t ino = inode->i_ino;
184 int ret = 0;
185 bool need_cp = false;
186 struct writeback_control wbc = {
187 .sync_mode = WB_SYNC_ALL,
188 .nr_to_write = LONG_MAX,
189 .for_reclaim = 0,
190 };
191
192 if (unlikely(f2fs_readonly(inode->i_sb)))
193 return 0;
194
195 trace_f2fs_sync_file_enter(inode);
196
197 /* if fdatasync is triggered, let's do in-place-update */
198 if (get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
199 set_inode_flag(fi, FI_NEED_IPU);
200 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
201 clear_inode_flag(fi, FI_NEED_IPU);
202
203 if (ret) {
204 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
205 return ret;
206 }
207
208 /* if the inode is dirty, let's recover all the time */
209 if (!datasync) {
210 f2fs_write_inode(inode, NULL);
211 goto go_write;
212 }
213
214 /*
215 * if there is no written data, don't waste time to write recovery info.
216 */
217 if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
218 !exist_written_data(sbi, ino, APPEND_INO)) {
219
220 /* it may call write_inode just prior to fsync */
221 if (need_inode_page_update(sbi, ino))
222 goto go_write;
223
224 if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
225 exist_written_data(sbi, ino, UPDATE_INO))
226 goto flush_out;
227 goto out;
228 }
229 go_write:
230 /* guarantee free sections for fsync */
231 f2fs_balance_fs(sbi);
232
233 /*
234 * Both of fdatasync() and fsync() are able to be recovered from
235 * sudden-power-off.
236 */
237 down_read(&fi->i_sem);
238 need_cp = need_do_checkpoint(inode);
239 up_read(&fi->i_sem);
240
241 if (need_cp) {
242 /* all the dirty node pages should be flushed for POR */
243 ret = f2fs_sync_fs(inode->i_sb, 1);
244
245 /*
246 * We've secured consistency through sync_fs. Following pino
247 * will be used only for fsynced inodes after checkpoint.
248 */
249 try_to_fix_pino(inode);
250 clear_inode_flag(fi, FI_APPEND_WRITE);
251 clear_inode_flag(fi, FI_UPDATE_WRITE);
252 goto out;
253 }
254 sync_nodes:
255 sync_node_pages(sbi, ino, &wbc);
256
257 /* if cp_error was enabled, we should avoid infinite loop */
258 if (unlikely(f2fs_cp_error(sbi)))
259 goto out;
260
261 if (need_inode_block_update(sbi, ino)) {
262 mark_inode_dirty_sync(inode);
263 f2fs_write_inode(inode, NULL);
264 goto sync_nodes;
265 }
266
267 ret = wait_on_node_pages_writeback(sbi, ino);
268 if (ret)
269 goto out;
270
271 /* once recovery info is written, don't need to tack this */
272 remove_dirty_inode(sbi, ino, APPEND_INO);
273 clear_inode_flag(fi, FI_APPEND_WRITE);
274 flush_out:
275 remove_dirty_inode(sbi, ino, UPDATE_INO);
276 clear_inode_flag(fi, FI_UPDATE_WRITE);
277 ret = f2fs_issue_flush(sbi);
278 out:
279 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
280 f2fs_trace_ios(NULL, 1);
281 return ret;
282 }
283
284 static pgoff_t __get_first_dirty_index(struct address_space *mapping,
285 pgoff_t pgofs, int whence)
286 {
287 struct pagevec pvec;
288 int nr_pages;
289
290 if (whence != SEEK_DATA)
291 return 0;
292
293 /* find first dirty page index */
294 pagevec_init(&pvec, 0);
295 nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
296 PAGECACHE_TAG_DIRTY, 1);
297 pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
298 pagevec_release(&pvec);
299 return pgofs;
300 }
301
302 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
303 int whence)
304 {
305 switch (whence) {
306 case SEEK_DATA:
307 if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
308 (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
309 return true;
310 break;
311 case SEEK_HOLE:
312 if (blkaddr == NULL_ADDR)
313 return true;
314 break;
315 }
316 return false;
317 }
318
319 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
320 {
321 struct inode *inode = file->f_mapping->host;
322 loff_t maxbytes = inode->i_sb->s_maxbytes;
323 struct dnode_of_data dn;
324 pgoff_t pgofs, end_offset, dirty;
325 loff_t data_ofs = offset;
326 loff_t isize;
327 int err = 0;
328
329 mutex_lock(&inode->i_mutex);
330
331 isize = i_size_read(inode);
332 if (offset >= isize)
333 goto fail;
334
335 /* handle inline data case */
336 if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
337 if (whence == SEEK_HOLE)
338 data_ofs = isize;
339 goto found;
340 }
341
342 pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);
343
344 dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
345
346 for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
347 set_new_dnode(&dn, inode, NULL, NULL, 0);
348 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
349 if (err && err != -ENOENT) {
350 goto fail;
351 } else if (err == -ENOENT) {
352 /* direct node does not exists */
353 if (whence == SEEK_DATA) {
354 pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
355 F2FS_I(inode));
356 continue;
357 } else {
358 goto found;
359 }
360 }
361
362 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
363
364 /* find data/hole in dnode block */
365 for (; dn.ofs_in_node < end_offset;
366 dn.ofs_in_node++, pgofs++,
367 data_ofs = (loff_t)pgofs << PAGE_CACHE_SHIFT) {
368 block_t blkaddr;
369 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
370
371 if (__found_offset(blkaddr, dirty, pgofs, whence)) {
372 f2fs_put_dnode(&dn);
373 goto found;
374 }
375 }
376 f2fs_put_dnode(&dn);
377 }
378
379 if (whence == SEEK_DATA)
380 goto fail;
381 found:
382 if (whence == SEEK_HOLE && data_ofs > isize)
383 data_ofs = isize;
384 mutex_unlock(&inode->i_mutex);
385 return vfs_setpos(file, data_ofs, maxbytes);
386 fail:
387 mutex_unlock(&inode->i_mutex);
388 return -ENXIO;
389 }
390
391 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
392 {
393 struct inode *inode = file->f_mapping->host;
394 loff_t maxbytes = inode->i_sb->s_maxbytes;
395
396 switch (whence) {
397 case SEEK_SET:
398 case SEEK_CUR:
399 case SEEK_END:
400 return generic_file_llseek_size(file, offset, whence,
401 maxbytes, i_size_read(inode));
402 case SEEK_DATA:
403 case SEEK_HOLE:
404 if (offset < 0)
405 return -ENXIO;
406 return f2fs_seek_block(file, offset, whence);
407 }
408
409 return -EINVAL;
410 }
411
412 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
413 {
414 struct inode *inode = file_inode(file);
415
416 if (f2fs_encrypted_inode(inode)) {
417 int err = f2fs_get_encryption_info(inode);
418 if (err)
419 return 0;
420 }
421
422 /* we don't need to use inline_data strictly */
423 if (f2fs_has_inline_data(inode)) {
424 int err = f2fs_convert_inline_inode(inode);
425 if (err)
426 return err;
427 }
428
429 file_accessed(file);
430 vma->vm_ops = &f2fs_file_vm_ops;
431 return 0;
432 }
433
434 static int f2fs_file_open(struct inode *inode, struct file *filp)
435 {
436 int ret = generic_file_open(inode, filp);
437
438 if (!ret && f2fs_encrypted_inode(inode)) {
439 ret = f2fs_get_encryption_info(inode);
440 if (ret)
441 ret = -EACCES;
442 }
443 return ret;
444 }
445
446 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
447 {
448 int nr_free = 0, ofs = dn->ofs_in_node;
449 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
450 struct f2fs_node *raw_node;
451 __le32 *addr;
452
453 raw_node = F2FS_NODE(dn->node_page);
454 addr = blkaddr_in_node(raw_node) + ofs;
455
456 for (; count > 0; count--, addr++, dn->ofs_in_node++) {
457 block_t blkaddr = le32_to_cpu(*addr);
458 if (blkaddr == NULL_ADDR)
459 continue;
460
461 dn->data_blkaddr = NULL_ADDR;
462 set_data_blkaddr(dn);
463 f2fs_update_extent_cache(dn);
464 invalidate_blocks(sbi, blkaddr);
465 if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
466 clear_inode_flag(F2FS_I(dn->inode),
467 FI_FIRST_BLOCK_WRITTEN);
468 nr_free++;
469 }
470 if (nr_free) {
471 dec_valid_block_count(sbi, dn->inode, nr_free);
472 set_page_dirty(dn->node_page);
473 sync_inode_page(dn);
474 }
475 dn->ofs_in_node = ofs;
476
477 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
478 dn->ofs_in_node, nr_free);
479 return nr_free;
480 }
481
482 void truncate_data_blocks(struct dnode_of_data *dn)
483 {
484 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
485 }
486
487 static int truncate_partial_data_page(struct inode *inode, u64 from,
488 bool cache_only)
489 {
490 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
491 pgoff_t index = from >> PAGE_CACHE_SHIFT;
492 struct address_space *mapping = inode->i_mapping;
493 struct page *page;
494
495 if (!offset && !cache_only)
496 return 0;
497
498 if (cache_only) {
499 page = grab_cache_page(mapping, index);
500 if (page && PageUptodate(page))
501 goto truncate_out;
502 f2fs_put_page(page, 1);
503 return 0;
504 }
505
506 page = get_lock_data_page(inode, index);
507 if (IS_ERR(page))
508 return 0;
509 truncate_out:
510 f2fs_wait_on_page_writeback(page, DATA);
511 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
512 if (!cache_only || !f2fs_encrypted_inode(inode) || !S_ISREG(inode->i_mode))
513 set_page_dirty(page);
514 f2fs_put_page(page, 1);
515 return 0;
516 }
517
518 int truncate_blocks(struct inode *inode, u64 from, bool lock)
519 {
520 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
521 unsigned int blocksize = inode->i_sb->s_blocksize;
522 struct dnode_of_data dn;
523 pgoff_t free_from;
524 int count = 0, err = 0;
525 struct page *ipage;
526 bool truncate_page = false;
527
528 trace_f2fs_truncate_blocks_enter(inode, from);
529
530 free_from = (pgoff_t)F2FS_BYTES_TO_BLK(from + blocksize - 1);
531
532 if (lock)
533 f2fs_lock_op(sbi);
534
535 ipage = get_node_page(sbi, inode->i_ino);
536 if (IS_ERR(ipage)) {
537 err = PTR_ERR(ipage);
538 goto out;
539 }
540
541 if (f2fs_has_inline_data(inode)) {
542 if (truncate_inline_inode(ipage, from))
543 set_page_dirty(ipage);
544 f2fs_put_page(ipage, 1);
545 truncate_page = true;
546 goto out;
547 }
548
549 set_new_dnode(&dn, inode, ipage, NULL, 0);
550 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
551 if (err) {
552 if (err == -ENOENT)
553 goto free_next;
554 goto out;
555 }
556
557 count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
558
559 count -= dn.ofs_in_node;
560 f2fs_bug_on(sbi, count < 0);
561
562 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
563 truncate_data_blocks_range(&dn, count);
564 free_from += count;
565 }
566
567 f2fs_put_dnode(&dn);
568 free_next:
569 err = truncate_inode_blocks(inode, free_from);
570 out:
571 if (lock)
572 f2fs_unlock_op(sbi);
573
574 /* lastly zero out the first data page */
575 if (!err)
576 err = truncate_partial_data_page(inode, from, truncate_page);
577
578 trace_f2fs_truncate_blocks_exit(inode, err);
579 return err;
580 }
581
582 void f2fs_truncate(struct inode *inode, bool lock)
583 {
584 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
585 S_ISLNK(inode->i_mode)))
586 return;
587
588 trace_f2fs_truncate(inode);
589
590 /* we should check inline_data size */
591 if (f2fs_has_inline_data(inode) && !f2fs_may_inline_data(inode)) {
592 if (f2fs_convert_inline_inode(inode))
593 return;
594 }
595
596 if (!truncate_blocks(inode, i_size_read(inode), lock)) {
597 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
598 mark_inode_dirty(inode);
599 }
600 }
601
602 int f2fs_getattr(struct vfsmount *mnt,
603 struct dentry *dentry, struct kstat *stat)
604 {
605 struct inode *inode = d_inode(dentry);
606 generic_fillattr(inode, stat);
607 stat->blocks <<= 3;
608 return 0;
609 }
610
611 #ifdef CONFIG_F2FS_FS_POSIX_ACL
612 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
613 {
614 struct f2fs_inode_info *fi = F2FS_I(inode);
615 unsigned int ia_valid = attr->ia_valid;
616
617 if (ia_valid & ATTR_UID)
618 inode->i_uid = attr->ia_uid;
619 if (ia_valid & ATTR_GID)
620 inode->i_gid = attr->ia_gid;
621 if (ia_valid & ATTR_ATIME)
622 inode->i_atime = timespec_trunc(attr->ia_atime,
623 inode->i_sb->s_time_gran);
624 if (ia_valid & ATTR_MTIME)
625 inode->i_mtime = timespec_trunc(attr->ia_mtime,
626 inode->i_sb->s_time_gran);
627 if (ia_valid & ATTR_CTIME)
628 inode->i_ctime = timespec_trunc(attr->ia_ctime,
629 inode->i_sb->s_time_gran);
630 if (ia_valid & ATTR_MODE) {
631 umode_t mode = attr->ia_mode;
632
633 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
634 mode &= ~S_ISGID;
635 set_acl_inode(fi, mode);
636 }
637 }
638 #else
639 #define __setattr_copy setattr_copy
640 #endif
641
642 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
643 {
644 struct inode *inode = d_inode(dentry);
645 struct f2fs_inode_info *fi = F2FS_I(inode);
646 int err;
647
648 err = inode_change_ok(inode, attr);
649 if (err)
650 return err;
651
652 if (attr->ia_valid & ATTR_SIZE) {
653 if (f2fs_encrypted_inode(inode) &&
654 f2fs_get_encryption_info(inode))
655 return -EACCES;
656
657 if (attr->ia_size <= i_size_read(inode)) {
658 truncate_setsize(inode, attr->ia_size);
659 f2fs_truncate(inode, true);
660 f2fs_balance_fs(F2FS_I_SB(inode));
661 } else {
662 /*
663 * do not trim all blocks after i_size if target size is
664 * larger than i_size.
665 */
666 truncate_setsize(inode, attr->ia_size);
667 }
668 }
669
670 __setattr_copy(inode, attr);
671
672 if (attr->ia_valid & ATTR_MODE) {
673 err = posix_acl_chmod(inode, get_inode_mode(inode));
674 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
675 inode->i_mode = fi->i_acl_mode;
676 clear_inode_flag(fi, FI_ACL_MODE);
677 }
678 }
679
680 mark_inode_dirty(inode);
681 return err;
682 }
683
684 const struct inode_operations f2fs_file_inode_operations = {
685 .getattr = f2fs_getattr,
686 .setattr = f2fs_setattr,
687 .get_acl = f2fs_get_acl,
688 .set_acl = f2fs_set_acl,
689 #ifdef CONFIG_F2FS_FS_XATTR
690 .setxattr = generic_setxattr,
691 .getxattr = generic_getxattr,
692 .listxattr = f2fs_listxattr,
693 .removexattr = generic_removexattr,
694 #endif
695 .fiemap = f2fs_fiemap,
696 };
697
698 static int fill_zero(struct inode *inode, pgoff_t index,
699 loff_t start, loff_t len)
700 {
701 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
702 struct page *page;
703
704 if (!len)
705 return 0;
706
707 f2fs_balance_fs(sbi);
708
709 f2fs_lock_op(sbi);
710 page = get_new_data_page(inode, NULL, index, false);
711 f2fs_unlock_op(sbi);
712
713 if (IS_ERR(page))
714 return PTR_ERR(page);
715
716 f2fs_wait_on_page_writeback(page, DATA);
717 zero_user(page, start, len);
718 set_page_dirty(page);
719 f2fs_put_page(page, 1);
720 return 0;
721 }
722
723 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
724 {
725 pgoff_t index;
726 int err;
727
728 for (index = pg_start; index < pg_end; index++) {
729 struct dnode_of_data dn;
730
731 set_new_dnode(&dn, inode, NULL, NULL, 0);
732 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
733 if (err) {
734 if (err == -ENOENT)
735 continue;
736 return err;
737 }
738
739 if (dn.data_blkaddr != NULL_ADDR)
740 truncate_data_blocks_range(&dn, 1);
741 f2fs_put_dnode(&dn);
742 }
743 return 0;
744 }
745
746 static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
747 {
748 pgoff_t pg_start, pg_end;
749 loff_t off_start, off_end;
750 int ret = 0;
751
752 if (!S_ISREG(inode->i_mode))
753 return -EOPNOTSUPP;
754
755 if (f2fs_has_inline_data(inode)) {
756 ret = f2fs_convert_inline_inode(inode);
757 if (ret)
758 return ret;
759 }
760
761 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
762 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
763
764 off_start = offset & (PAGE_CACHE_SIZE - 1);
765 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
766
767 if (pg_start == pg_end) {
768 ret = fill_zero(inode, pg_start, off_start,
769 off_end - off_start);
770 if (ret)
771 return ret;
772 } else {
773 if (off_start) {
774 ret = fill_zero(inode, pg_start++, off_start,
775 PAGE_CACHE_SIZE - off_start);
776 if (ret)
777 return ret;
778 }
779 if (off_end) {
780 ret = fill_zero(inode, pg_end, 0, off_end);
781 if (ret)
782 return ret;
783 }
784
785 if (pg_start < pg_end) {
786 struct address_space *mapping = inode->i_mapping;
787 loff_t blk_start, blk_end;
788 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
789
790 f2fs_balance_fs(sbi);
791
792 blk_start = pg_start << PAGE_CACHE_SHIFT;
793 blk_end = pg_end << PAGE_CACHE_SHIFT;
794 truncate_inode_pages_range(mapping, blk_start,
795 blk_end - 1);
796
797 f2fs_lock_op(sbi);
798 ret = truncate_hole(inode, pg_start, pg_end);
799 f2fs_unlock_op(sbi);
800 }
801 }
802
803 return ret;
804 }
805
806 static int f2fs_do_collapse(struct inode *inode, pgoff_t start, pgoff_t end)
807 {
808 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
809 struct dnode_of_data dn;
810 pgoff_t nrpages = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;
811 int ret = 0;
812
813 for (; end < nrpages; start++, end++) {
814 block_t new_addr, old_addr;
815
816 f2fs_lock_op(sbi);
817
818 set_new_dnode(&dn, inode, NULL, NULL, 0);
819 ret = get_dnode_of_data(&dn, end, LOOKUP_NODE_RA);
820 if (ret && ret != -ENOENT) {
821 goto out;
822 } else if (ret == -ENOENT) {
823 new_addr = NULL_ADDR;
824 } else {
825 new_addr = dn.data_blkaddr;
826 truncate_data_blocks_range(&dn, 1);
827 f2fs_put_dnode(&dn);
828 }
829
830 if (new_addr == NULL_ADDR) {
831 set_new_dnode(&dn, inode, NULL, NULL, 0);
832 ret = get_dnode_of_data(&dn, start, LOOKUP_NODE_RA);
833 if (ret && ret != -ENOENT) {
834 goto out;
835 } else if (ret == -ENOENT) {
836 f2fs_unlock_op(sbi);
837 continue;
838 }
839
840 if (dn.data_blkaddr == NULL_ADDR) {
841 f2fs_put_dnode(&dn);
842 f2fs_unlock_op(sbi);
843 continue;
844 } else {
845 truncate_data_blocks_range(&dn, 1);
846 }
847
848 f2fs_put_dnode(&dn);
849 } else {
850 struct page *ipage;
851
852 ipage = get_node_page(sbi, inode->i_ino);
853 if (IS_ERR(ipage)) {
854 ret = PTR_ERR(ipage);
855 goto out;
856 }
857
858 set_new_dnode(&dn, inode, ipage, NULL, 0);
859 ret = f2fs_reserve_block(&dn, start);
860 if (ret)
861 goto out;
862
863 old_addr = dn.data_blkaddr;
864 if (old_addr != NEW_ADDR && new_addr == NEW_ADDR) {
865 dn.data_blkaddr = NULL_ADDR;
866 f2fs_update_extent_cache(&dn);
867 invalidate_blocks(sbi, old_addr);
868
869 dn.data_blkaddr = new_addr;
870 set_data_blkaddr(&dn);
871 } else if (new_addr != NEW_ADDR) {
872 struct node_info ni;
873
874 get_node_info(sbi, dn.nid, &ni);
875 f2fs_replace_block(sbi, &dn, old_addr, new_addr,
876 ni.version, true);
877 }
878
879 f2fs_put_dnode(&dn);
880 }
881 f2fs_unlock_op(sbi);
882 }
883 return 0;
884 out:
885 f2fs_unlock_op(sbi);
886 return ret;
887 }
888
889 static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
890 {
891 pgoff_t pg_start, pg_end;
892 loff_t new_size;
893 int ret;
894
895 if (!S_ISREG(inode->i_mode))
896 return -EINVAL;
897
898 if (offset + len >= i_size_read(inode))
899 return -EINVAL;
900
901 /* collapse range should be aligned to block size of f2fs. */
902 if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
903 return -EINVAL;
904
905 f2fs_balance_fs(F2FS_I_SB(inode));
906
907 if (f2fs_has_inline_data(inode)) {
908 ret = f2fs_convert_inline_inode(inode);
909 if (ret)
910 return ret;
911 }
912
913 pg_start = offset >> PAGE_CACHE_SHIFT;
914 pg_end = (offset + len) >> PAGE_CACHE_SHIFT;
915
916 /* write out all dirty pages from offset */
917 ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
918 if (ret)
919 return ret;
920
921 truncate_pagecache(inode, offset);
922
923 ret = f2fs_do_collapse(inode, pg_start, pg_end);
924 if (ret)
925 return ret;
926
927 new_size = i_size_read(inode) - len;
928
929 ret = truncate_blocks(inode, new_size, true);
930 if (!ret)
931 i_size_write(inode, new_size);
932
933 return ret;
934 }
935
936 static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
937 int mode)
938 {
939 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
940 struct address_space *mapping = inode->i_mapping;
941 pgoff_t index, pg_start, pg_end;
942 loff_t new_size = i_size_read(inode);
943 loff_t off_start, off_end;
944 int ret = 0;
945
946 if (!S_ISREG(inode->i_mode))
947 return -EINVAL;
948
949 ret = inode_newsize_ok(inode, (len + offset));
950 if (ret)
951 return ret;
952
953 f2fs_balance_fs(sbi);
954
955 if (f2fs_has_inline_data(inode)) {
956 ret = f2fs_convert_inline_inode(inode);
957 if (ret)
958 return ret;
959 }
960
961 ret = filemap_write_and_wait_range(mapping, offset, offset + len - 1);
962 if (ret)
963 return ret;
964
965 truncate_pagecache_range(inode, offset, offset + len - 1);
966
967 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
968 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
969
970 off_start = offset & (PAGE_CACHE_SIZE - 1);
971 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
972
973 if (pg_start == pg_end) {
974 ret = fill_zero(inode, pg_start, off_start,
975 off_end - off_start);
976 if (ret)
977 return ret;
978
979 if (offset + len > new_size)
980 new_size = offset + len;
981 new_size = max_t(loff_t, new_size, offset + len);
982 } else {
983 if (off_start) {
984 ret = fill_zero(inode, pg_start++, off_start,
985 PAGE_CACHE_SIZE - off_start);
986 if (ret)
987 return ret;
988
989 new_size = max_t(loff_t, new_size,
990 pg_start << PAGE_CACHE_SHIFT);
991 }
992
993 for (index = pg_start; index < pg_end; index++) {
994 struct dnode_of_data dn;
995 struct page *ipage;
996
997 f2fs_lock_op(sbi);
998
999 ipage = get_node_page(sbi, inode->i_ino);
1000 if (IS_ERR(ipage)) {
1001 ret = PTR_ERR(ipage);
1002 f2fs_unlock_op(sbi);
1003 goto out;
1004 }
1005
1006 set_new_dnode(&dn, inode, ipage, NULL, 0);
1007 ret = f2fs_reserve_block(&dn, index);
1008 if (ret) {
1009 f2fs_unlock_op(sbi);
1010 goto out;
1011 }
1012
1013 if (dn.data_blkaddr != NEW_ADDR) {
1014 invalidate_blocks(sbi, dn.data_blkaddr);
1015
1016 dn.data_blkaddr = NEW_ADDR;
1017 set_data_blkaddr(&dn);
1018
1019 dn.data_blkaddr = NULL_ADDR;
1020 f2fs_update_extent_cache(&dn);
1021 }
1022 f2fs_put_dnode(&dn);
1023 f2fs_unlock_op(sbi);
1024
1025 new_size = max_t(loff_t, new_size,
1026 (index + 1) << PAGE_CACHE_SHIFT);
1027 }
1028
1029 if (off_end) {
1030 ret = fill_zero(inode, pg_end, 0, off_end);
1031 if (ret)
1032 goto out;
1033
1034 new_size = max_t(loff_t, new_size, offset + len);
1035 }
1036 }
1037
1038 out:
1039 if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size) {
1040 i_size_write(inode, new_size);
1041 mark_inode_dirty(inode);
1042 update_inode_page(inode);
1043 }
1044
1045 return ret;
1046 }
1047
1048 static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
1049 {
1050 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1051 pgoff_t pg_start, pg_end, delta, nrpages, idx;
1052 loff_t new_size;
1053 int ret;
1054
1055 if (!S_ISREG(inode->i_mode))
1056 return -EINVAL;
1057
1058 new_size = i_size_read(inode) + len;
1059 if (new_size > inode->i_sb->s_maxbytes)
1060 return -EFBIG;
1061
1062 if (offset >= i_size_read(inode))
1063 return -EINVAL;
1064
1065 /* insert range should be aligned to block size of f2fs. */
1066 if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
1067 return -EINVAL;
1068
1069 f2fs_balance_fs(sbi);
1070
1071 if (f2fs_has_inline_data(inode)) {
1072 ret = f2fs_convert_inline_inode(inode);
1073 if (ret)
1074 return ret;
1075 }
1076
1077 ret = truncate_blocks(inode, i_size_read(inode), true);
1078 if (ret)
1079 return ret;
1080
1081 /* write out all dirty pages from offset */
1082 ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
1083 if (ret)
1084 return ret;
1085
1086 truncate_pagecache(inode, offset);
1087
1088 pg_start = offset >> PAGE_CACHE_SHIFT;
1089 pg_end = (offset + len) >> PAGE_CACHE_SHIFT;
1090 delta = pg_end - pg_start;
1091 nrpages = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;
1092
1093 for (idx = nrpages - 1; idx >= pg_start && idx != -1; idx--) {
1094 struct dnode_of_data dn;
1095 struct page *ipage;
1096 block_t new_addr, old_addr;
1097
1098 f2fs_lock_op(sbi);
1099
1100 set_new_dnode(&dn, inode, NULL, NULL, 0);
1101 ret = get_dnode_of_data(&dn, idx, LOOKUP_NODE_RA);
1102 if (ret && ret != -ENOENT) {
1103 goto out;
1104 } else if (ret == -ENOENT) {
1105 goto next;
1106 } else if (dn.data_blkaddr == NULL_ADDR) {
1107 f2fs_put_dnode(&dn);
1108 goto next;
1109 } else {
1110 new_addr = dn.data_blkaddr;
1111 truncate_data_blocks_range(&dn, 1);
1112 f2fs_put_dnode(&dn);
1113 }
1114
1115 ipage = get_node_page(sbi, inode->i_ino);
1116 if (IS_ERR(ipage)) {
1117 ret = PTR_ERR(ipage);
1118 goto out;
1119 }
1120
1121 set_new_dnode(&dn, inode, ipage, NULL, 0);
1122 ret = f2fs_reserve_block(&dn, idx + delta);
1123 if (ret)
1124 goto out;
1125
1126 old_addr = dn.data_blkaddr;
1127 f2fs_bug_on(sbi, old_addr != NEW_ADDR);
1128
1129 if (new_addr != NEW_ADDR) {
1130 struct node_info ni;
1131
1132 get_node_info(sbi, dn.nid, &ni);
1133 f2fs_replace_block(sbi, &dn, old_addr, new_addr,
1134 ni.version, true);
1135 }
1136 f2fs_put_dnode(&dn);
1137 next:
1138 f2fs_unlock_op(sbi);
1139 }
1140
1141 i_size_write(inode, new_size);
1142 return 0;
1143 out:
1144 f2fs_unlock_op(sbi);
1145 return ret;
1146 }
1147
1148 static int expand_inode_data(struct inode *inode, loff_t offset,
1149 loff_t len, int mode)
1150 {
1151 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1152 pgoff_t index, pg_start, pg_end;
1153 loff_t new_size = i_size_read(inode);
1154 loff_t off_start, off_end;
1155 int ret = 0;
1156
1157 f2fs_balance_fs(sbi);
1158
1159 ret = inode_newsize_ok(inode, (len + offset));
1160 if (ret)
1161 return ret;
1162
1163 if (f2fs_has_inline_data(inode)) {
1164 ret = f2fs_convert_inline_inode(inode);
1165 if (ret)
1166 return ret;
1167 }
1168
1169 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
1170 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
1171
1172 off_start = offset & (PAGE_CACHE_SIZE - 1);
1173 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
1174
1175 f2fs_lock_op(sbi);
1176
1177 for (index = pg_start; index <= pg_end; index++) {
1178 struct dnode_of_data dn;
1179
1180 if (index == pg_end && !off_end)
1181 goto noalloc;
1182
1183 set_new_dnode(&dn, inode, NULL, NULL, 0);
1184 ret = f2fs_reserve_block(&dn, index);
1185 if (ret)
1186 break;
1187 noalloc:
1188 if (pg_start == pg_end)
1189 new_size = offset + len;
1190 else if (index == pg_start && off_start)
1191 new_size = (index + 1) << PAGE_CACHE_SHIFT;
1192 else if (index == pg_end)
1193 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
1194 else
1195 new_size += PAGE_CACHE_SIZE;
1196 }
1197
1198 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1199 i_size_read(inode) < new_size) {
1200 i_size_write(inode, new_size);
1201 mark_inode_dirty(inode);
1202 update_inode_page(inode);
1203 }
1204 f2fs_unlock_op(sbi);
1205
1206 return ret;
1207 }
1208
1209 static long f2fs_fallocate(struct file *file, int mode,
1210 loff_t offset, loff_t len)
1211 {
1212 struct inode *inode = file_inode(file);
1213 long ret = 0;
1214
1215 if (f2fs_encrypted_inode(inode) &&
1216 (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
1217 return -EOPNOTSUPP;
1218
1219 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
1220 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
1221 FALLOC_FL_INSERT_RANGE))
1222 return -EOPNOTSUPP;
1223
1224 mutex_lock(&inode->i_mutex);
1225
1226 if (mode & FALLOC_FL_PUNCH_HOLE) {
1227 if (offset >= inode->i_size)
1228 goto out;
1229
1230 ret = punch_hole(inode, offset, len);
1231 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
1232 ret = f2fs_collapse_range(inode, offset, len);
1233 } else if (mode & FALLOC_FL_ZERO_RANGE) {
1234 ret = f2fs_zero_range(inode, offset, len, mode);
1235 } else if (mode & FALLOC_FL_INSERT_RANGE) {
1236 ret = f2fs_insert_range(inode, offset, len);
1237 } else {
1238 ret = expand_inode_data(inode, offset, len, mode);
1239 }
1240
1241 if (!ret) {
1242 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1243 mark_inode_dirty(inode);
1244 }
1245
1246 out:
1247 mutex_unlock(&inode->i_mutex);
1248
1249 trace_f2fs_fallocate(inode, mode, offset, len, ret);
1250 return ret;
1251 }
1252
1253 static int f2fs_release_file(struct inode *inode, struct file *filp)
1254 {
1255 /* some remained atomic pages should discarded */
1256 if (f2fs_is_atomic_file(inode))
1257 commit_inmem_pages(inode, true);
1258 if (f2fs_is_volatile_file(inode)) {
1259 set_inode_flag(F2FS_I(inode), FI_DROP_CACHE);
1260 filemap_fdatawrite(inode->i_mapping);
1261 clear_inode_flag(F2FS_I(inode), FI_DROP_CACHE);
1262 }
1263 return 0;
1264 }
1265
1266 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
1267 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
1268
1269 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
1270 {
1271 if (S_ISDIR(mode))
1272 return flags;
1273 else if (S_ISREG(mode))
1274 return flags & F2FS_REG_FLMASK;
1275 else
1276 return flags & F2FS_OTHER_FLMASK;
1277 }
1278
1279 static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
1280 {
1281 struct inode *inode = file_inode(filp);
1282 struct f2fs_inode_info *fi = F2FS_I(inode);
1283 unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
1284 return put_user(flags, (int __user *)arg);
1285 }
1286
1287 static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
1288 {
1289 struct inode *inode = file_inode(filp);
1290 struct f2fs_inode_info *fi = F2FS_I(inode);
1291 unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
1292 unsigned int oldflags;
1293 int ret;
1294
1295 ret = mnt_want_write_file(filp);
1296 if (ret)
1297 return ret;
1298
1299 if (!inode_owner_or_capable(inode)) {
1300 ret = -EACCES;
1301 goto out;
1302 }
1303
1304 if (get_user(flags, (int __user *)arg)) {
1305 ret = -EFAULT;
1306 goto out;
1307 }
1308
1309 flags = f2fs_mask_flags(inode->i_mode, flags);
1310
1311 mutex_lock(&inode->i_mutex);
1312
1313 oldflags = fi->i_flags;
1314
1315 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
1316 if (!capable(CAP_LINUX_IMMUTABLE)) {
1317 mutex_unlock(&inode->i_mutex);
1318 ret = -EPERM;
1319 goto out;
1320 }
1321 }
1322
1323 flags = flags & FS_FL_USER_MODIFIABLE;
1324 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
1325 fi->i_flags = flags;
1326 mutex_unlock(&inode->i_mutex);
1327
1328 f2fs_set_inode_flags(inode);
1329 inode->i_ctime = CURRENT_TIME;
1330 mark_inode_dirty(inode);
1331 out:
1332 mnt_drop_write_file(filp);
1333 return ret;
1334 }
1335
1336 static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
1337 {
1338 struct inode *inode = file_inode(filp);
1339
1340 return put_user(inode->i_generation, (int __user *)arg);
1341 }
1342
1343 static int f2fs_ioc_start_atomic_write(struct file *filp)
1344 {
1345 struct inode *inode = file_inode(filp);
1346 int ret;
1347
1348 if (!inode_owner_or_capable(inode))
1349 return -EACCES;
1350
1351 f2fs_balance_fs(F2FS_I_SB(inode));
1352
1353 if (f2fs_is_atomic_file(inode))
1354 return 0;
1355
1356 ret = f2fs_convert_inline_inode(inode);
1357 if (ret)
1358 return ret;
1359
1360 set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
1361 return 0;
1362 }
1363
1364 static int f2fs_ioc_commit_atomic_write(struct file *filp)
1365 {
1366 struct inode *inode = file_inode(filp);
1367 int ret;
1368
1369 if (!inode_owner_or_capable(inode))
1370 return -EACCES;
1371
1372 if (f2fs_is_volatile_file(inode))
1373 return 0;
1374
1375 ret = mnt_want_write_file(filp);
1376 if (ret)
1377 return ret;
1378
1379 if (f2fs_is_atomic_file(inode)) {
1380 clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
1381 ret = commit_inmem_pages(inode, false);
1382 if (ret)
1383 goto err_out;
1384 }
1385
1386 ret = f2fs_sync_file(filp, 0, LLONG_MAX, 0);
1387 err_out:
1388 mnt_drop_write_file(filp);
1389 return ret;
1390 }
1391
1392 static int f2fs_ioc_start_volatile_write(struct file *filp)
1393 {
1394 struct inode *inode = file_inode(filp);
1395 int ret;
1396
1397 if (!inode_owner_or_capable(inode))
1398 return -EACCES;
1399
1400 if (f2fs_is_volatile_file(inode))
1401 return 0;
1402
1403 ret = f2fs_convert_inline_inode(inode);
1404 if (ret)
1405 return ret;
1406
1407 set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
1408 return 0;
1409 }
1410
1411 static int f2fs_ioc_release_volatile_write(struct file *filp)
1412 {
1413 struct inode *inode = file_inode(filp);
1414
1415 if (!inode_owner_or_capable(inode))
1416 return -EACCES;
1417
1418 if (!f2fs_is_volatile_file(inode))
1419 return 0;
1420
1421 if (!f2fs_is_first_block_written(inode))
1422 return truncate_partial_data_page(inode, 0, true);
1423
1424 punch_hole(inode, 0, F2FS_BLKSIZE);
1425 return 0;
1426 }
1427
1428 static int f2fs_ioc_abort_volatile_write(struct file *filp)
1429 {
1430 struct inode *inode = file_inode(filp);
1431 int ret;
1432
1433 if (!inode_owner_or_capable(inode))
1434 return -EACCES;
1435
1436 ret = mnt_want_write_file(filp);
1437 if (ret)
1438 return ret;
1439
1440 f2fs_balance_fs(F2FS_I_SB(inode));
1441
1442 if (f2fs_is_atomic_file(inode)) {
1443 clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
1444 commit_inmem_pages(inode, true);
1445 }
1446
1447 if (f2fs_is_volatile_file(inode))
1448 clear_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
1449
1450 mnt_drop_write_file(filp);
1451 return ret;
1452 }
1453
1454 static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
1455 {
1456 struct inode *inode = file_inode(filp);
1457 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1458 struct super_block *sb = sbi->sb;
1459 __u32 in;
1460
1461 if (!capable(CAP_SYS_ADMIN))
1462 return -EPERM;
1463
1464 if (get_user(in, (__u32 __user *)arg))
1465 return -EFAULT;
1466
1467 switch (in) {
1468 case F2FS_GOING_DOWN_FULLSYNC:
1469 sb = freeze_bdev(sb->s_bdev);
1470 if (sb && !IS_ERR(sb)) {
1471 f2fs_stop_checkpoint(sbi);
1472 thaw_bdev(sb->s_bdev, sb);
1473 }
1474 break;
1475 case F2FS_GOING_DOWN_METASYNC:
1476 /* do checkpoint only */
1477 f2fs_sync_fs(sb, 1);
1478 f2fs_stop_checkpoint(sbi);
1479 break;
1480 case F2FS_GOING_DOWN_NOSYNC:
1481 f2fs_stop_checkpoint(sbi);
1482 break;
1483 default:
1484 return -EINVAL;
1485 }
1486 return 0;
1487 }
1488
1489 static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
1490 {
1491 struct inode *inode = file_inode(filp);
1492 struct super_block *sb = inode->i_sb;
1493 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1494 struct fstrim_range range;
1495 int ret;
1496
1497 if (!capable(CAP_SYS_ADMIN))
1498 return -EPERM;
1499
1500 if (!blk_queue_discard(q))
1501 return -EOPNOTSUPP;
1502
1503 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1504 sizeof(range)))
1505 return -EFAULT;
1506
1507 range.minlen = max((unsigned int)range.minlen,
1508 q->limits.discard_granularity);
1509 ret = f2fs_trim_fs(F2FS_SB(sb), &range);
1510 if (ret < 0)
1511 return ret;
1512
1513 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1514 sizeof(range)))
1515 return -EFAULT;
1516 return 0;
1517 }
1518
1519 static bool uuid_is_nonzero(__u8 u[16])
1520 {
1521 int i;
1522
1523 for (i = 0; i < 16; i++)
1524 if (u[i])
1525 return true;
1526 return false;
1527 }
1528
1529 static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
1530 {
1531 #ifdef CONFIG_F2FS_FS_ENCRYPTION
1532 struct f2fs_encryption_policy policy;
1533 struct inode *inode = file_inode(filp);
1534
1535 if (copy_from_user(&policy, (struct f2fs_encryption_policy __user *)arg,
1536 sizeof(policy)))
1537 return -EFAULT;
1538
1539 return f2fs_process_policy(&policy, inode);
1540 #else
1541 return -EOPNOTSUPP;
1542 #endif
1543 }
1544
1545 static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg)
1546 {
1547 #ifdef CONFIG_F2FS_FS_ENCRYPTION
1548 struct f2fs_encryption_policy policy;
1549 struct inode *inode = file_inode(filp);
1550 int err;
1551
1552 err = f2fs_get_policy(inode, &policy);
1553 if (err)
1554 return err;
1555
1556 if (copy_to_user((struct f2fs_encryption_policy __user *)arg, &policy,
1557 sizeof(policy)))
1558 return -EFAULT;
1559 return 0;
1560 #else
1561 return -EOPNOTSUPP;
1562 #endif
1563 }
1564
1565 static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
1566 {
1567 struct inode *inode = file_inode(filp);
1568 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1569 int err;
1570
1571 if (!f2fs_sb_has_crypto(inode->i_sb))
1572 return -EOPNOTSUPP;
1573
1574 if (uuid_is_nonzero(sbi->raw_super->encrypt_pw_salt))
1575 goto got_it;
1576
1577 err = mnt_want_write_file(filp);
1578 if (err)
1579 return err;
1580
1581 /* update superblock with uuid */
1582 generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
1583
1584 err = f2fs_commit_super(sbi, false);
1585
1586 mnt_drop_write_file(filp);
1587 if (err) {
1588 /* undo new data */
1589 memset(sbi->raw_super->encrypt_pw_salt, 0, 16);
1590 return err;
1591 }
1592 got_it:
1593 if (copy_to_user((__u8 __user *)arg, sbi->raw_super->encrypt_pw_salt,
1594 16))
1595 return -EFAULT;
1596 return 0;
1597 }
1598
1599 static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
1600 {
1601 struct inode *inode = file_inode(filp);
1602 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1603 __u32 i, count;
1604
1605 if (!capable(CAP_SYS_ADMIN))
1606 return -EPERM;
1607
1608 if (get_user(count, (__u32 __user *)arg))
1609 return -EFAULT;
1610
1611 if (!count || count > F2FS_BATCH_GC_MAX_NUM)
1612 return -EINVAL;
1613
1614 for (i = 0; i < count; i++) {
1615 if (!mutex_trylock(&sbi->gc_mutex))
1616 break;
1617
1618 if (f2fs_gc(sbi))
1619 break;
1620 }
1621
1622 if (put_user(i, (__u32 __user *)arg))
1623 return -EFAULT;
1624
1625 return 0;
1626 }
1627
1628 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1629 {
1630 switch (cmd) {
1631 case F2FS_IOC_GETFLAGS:
1632 return f2fs_ioc_getflags(filp, arg);
1633 case F2FS_IOC_SETFLAGS:
1634 return f2fs_ioc_setflags(filp, arg);
1635 case F2FS_IOC_GETVERSION:
1636 return f2fs_ioc_getversion(filp, arg);
1637 case F2FS_IOC_START_ATOMIC_WRITE:
1638 return f2fs_ioc_start_atomic_write(filp);
1639 case F2FS_IOC_COMMIT_ATOMIC_WRITE:
1640 return f2fs_ioc_commit_atomic_write(filp);
1641 case F2FS_IOC_START_VOLATILE_WRITE:
1642 return f2fs_ioc_start_volatile_write(filp);
1643 case F2FS_IOC_RELEASE_VOLATILE_WRITE:
1644 return f2fs_ioc_release_volatile_write(filp);
1645 case F2FS_IOC_ABORT_VOLATILE_WRITE:
1646 return f2fs_ioc_abort_volatile_write(filp);
1647 case F2FS_IOC_SHUTDOWN:
1648 return f2fs_ioc_shutdown(filp, arg);
1649 case FITRIM:
1650 return f2fs_ioc_fitrim(filp, arg);
1651 case F2FS_IOC_SET_ENCRYPTION_POLICY:
1652 return f2fs_ioc_set_encryption_policy(filp, arg);
1653 case F2FS_IOC_GET_ENCRYPTION_POLICY:
1654 return f2fs_ioc_get_encryption_policy(filp, arg);
1655 case F2FS_IOC_GET_ENCRYPTION_PWSALT:
1656 return f2fs_ioc_get_encryption_pwsalt(filp, arg);
1657 case F2FS_IOC_GARBAGE_COLLECT:
1658 return f2fs_ioc_gc(filp, arg);
1659 default:
1660 return -ENOTTY;
1661 }
1662 }
1663
1664 static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1665 {
1666 struct inode *inode = file_inode(iocb->ki_filp);
1667
1668 if (f2fs_encrypted_inode(inode) &&
1669 !f2fs_has_encryption_key(inode) &&
1670 f2fs_get_encryption_info(inode))
1671 return -EACCES;
1672
1673 return generic_file_write_iter(iocb, from);
1674 }
1675
1676 #ifdef CONFIG_COMPAT
1677 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1678 {
1679 switch (cmd) {
1680 case F2FS_IOC32_GETFLAGS:
1681 cmd = F2FS_IOC_GETFLAGS;
1682 break;
1683 case F2FS_IOC32_SETFLAGS:
1684 cmd = F2FS_IOC_SETFLAGS;
1685 break;
1686 default:
1687 return -ENOIOCTLCMD;
1688 }
1689 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1690 }
1691 #endif
1692
1693 const struct file_operations f2fs_file_operations = {
1694 .llseek = f2fs_llseek,
1695 .read_iter = generic_file_read_iter,
1696 .write_iter = f2fs_file_write_iter,
1697 .open = f2fs_file_open,
1698 .release = f2fs_release_file,
1699 .mmap = f2fs_file_mmap,
1700 .fsync = f2fs_sync_file,
1701 .fallocate = f2fs_fallocate,
1702 .unlocked_ioctl = f2fs_ioctl,
1703 #ifdef CONFIG_COMPAT
1704 .compat_ioctl = f2fs_compat_ioctl,
1705 #endif
1706 .splice_read = generic_file_splice_read,
1707 .splice_write = iter_file_splice_write,
1708 };
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git