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ima: don't allocate a copy of template_fmt in template_desc_init_fields()
[linux/fpc-iii.git] / fs / f2fs / file.c
blob7d8b96275092a1109b1bfcb6f4bd07ef7d738f82
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
24 #include "f2fs.h"
25 #include "node.h"
26 #include "segment.h"
27 #include "xattr.h"
28 #include "acl.h"
29 #include <trace/events/f2fs.h>
30
31 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
32 struct vm_fault *vmf)
33 {
34 struct page *page = vmf->page;
35 struct inode *inode = file_inode(vma->vm_file);
36 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
37 struct dnode_of_data dn;
38 int err;
39
40 f2fs_balance_fs(sbi);
41
42 sb_start_pagefault(inode->i_sb);
43
44 /* block allocation */
45 f2fs_lock_op(sbi);
46 set_new_dnode(&dn, inode, NULL, NULL, 0);
47 err = f2fs_reserve_block(&dn, page->index);
48 f2fs_unlock_op(sbi);
49 if (err)
50 goto out;
51
52 file_update_time(vma->vm_file);
53 lock_page(page);
54 if (unlikely(page->mapping != inode->i_mapping ||
55 page_offset(page) > i_size_read(inode) ||
56 !PageUptodate(page))) {
57 unlock_page(page);
58 err = -EFAULT;
59 goto out;
60 }
61
62 /*
63 * check to see if the page is mapped already (no holes)
64 */
65 if (PageMappedToDisk(page))
66 goto mapped;
67
68 /* page is wholly or partially inside EOF */
69 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
70 unsigned offset;
71 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
72 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
73 }
74 set_page_dirty(page);
75 SetPageUptodate(page);
76
77 trace_f2fs_vm_page_mkwrite(page, DATA);
78 mapped:
79 /* fill the page */
80 f2fs_wait_on_page_writeback(page, DATA);
81 out:
82 sb_end_pagefault(inode->i_sb);
83 return block_page_mkwrite_return(err);
84 }
85
86 static const struct vm_operations_struct f2fs_file_vm_ops = {
87 .fault = filemap_fault,
88 .map_pages = filemap_map_pages,
89 .page_mkwrite = f2fs_vm_page_mkwrite,
90 .remap_pages = generic_file_remap_pages,
91 };
92
93 static int get_parent_ino(struct inode *inode, nid_t *pino)
94 {
95 struct dentry *dentry;
96
97 inode = igrab(inode);
98 dentry = d_find_any_alias(inode);
99 iput(inode);
100 if (!dentry)
101 return 0;
102
103 if (update_dent_inode(inode, &dentry->d_name)) {
104 dput(dentry);
105 return 0;
106 }
107
108 *pino = parent_ino(dentry);
109 dput(dentry);
110 return 1;
111 }
112
113 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
114 {
115 struct inode *inode = file->f_mapping->host;
116 struct f2fs_inode_info *fi = F2FS_I(inode);
117 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
118 int ret = 0;
119 bool need_cp = false;
120 struct writeback_control wbc = {
121 .sync_mode = WB_SYNC_ALL,
122 .nr_to_write = LONG_MAX,
123 .for_reclaim = 0,
124 };
125
126 if (unlikely(f2fs_readonly(inode->i_sb)))
127 return 0;
128
129 trace_f2fs_sync_file_enter(inode);
130 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
131 if (ret) {
132 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
133 return ret;
134 }
135
136 /* guarantee free sections for fsync */
137 f2fs_balance_fs(sbi);
138
139 down_read(&fi->i_sem);
140
141 /*
142 * Both of fdatasync() and fsync() are able to be recovered from
143 * sudden-power-off.
144 */
145 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
146 need_cp = true;
147 else if (file_wrong_pino(inode))
148 need_cp = true;
149 else if (!space_for_roll_forward(sbi))
150 need_cp = true;
151 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
152 need_cp = true;
153 else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
154 need_cp = true;
155
156 up_read(&fi->i_sem);
157
158 if (need_cp) {
159 nid_t pino;
160
161 /* all the dirty node pages should be flushed for POR */
162 ret = f2fs_sync_fs(inode->i_sb, 1);
163
164 down_write(&fi->i_sem);
165 F2FS_I(inode)->xattr_ver = 0;
166 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
167 get_parent_ino(inode, &pino)) {
168 F2FS_I(inode)->i_pino = pino;
169 file_got_pino(inode);
170 up_write(&fi->i_sem);
171 mark_inode_dirty_sync(inode);
172 ret = f2fs_write_inode(inode, NULL);
173 if (ret)
174 goto out;
175 } else {
176 up_write(&fi->i_sem);
177 }
178 } else {
179 /* if there is no written node page, write its inode page */
180 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
181 if (fsync_mark_done(sbi, inode->i_ino))
182 goto out;
183 mark_inode_dirty_sync(inode);
184 ret = f2fs_write_inode(inode, NULL);
185 if (ret)
186 goto out;
187 }
188 ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
189 if (ret)
190 goto out;
191 ret = f2fs_issue_flush(F2FS_SB(inode->i_sb));
192 }
193 out:
194 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
195 return ret;
196 }
197
198 static pgoff_t __get_first_dirty_index(struct address_space *mapping,
199 pgoff_t pgofs, int whence)
200 {
201 struct pagevec pvec;
202 int nr_pages;
203
204 if (whence != SEEK_DATA)
205 return 0;
206
207 /* find first dirty page index */
208 pagevec_init(&pvec, 0);
209 nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs, PAGECACHE_TAG_DIRTY, 1);
210 pgofs = nr_pages ? pvec.pages[0]->index: LONG_MAX;
211 pagevec_release(&pvec);
212 return pgofs;
213 }
214
215 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
216 int whence)
217 {
218 switch (whence) {
219 case SEEK_DATA:
220 if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
221 (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
222 return true;
223 break;
224 case SEEK_HOLE:
225 if (blkaddr == NULL_ADDR)
226 return true;
227 break;
228 }
229 return false;
230 }
231
232 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
233 {
234 struct inode *inode = file->f_mapping->host;
235 loff_t maxbytes = inode->i_sb->s_maxbytes;
236 struct dnode_of_data dn;
237 pgoff_t pgofs, end_offset, dirty;
238 loff_t data_ofs = offset;
239 loff_t isize;
240 int err = 0;
241
242 mutex_lock(&inode->i_mutex);
243
244 isize = i_size_read(inode);
245 if (offset >= isize)
246 goto fail;
247
248 /* handle inline data case */
249 if (f2fs_has_inline_data(inode)) {
250 if (whence == SEEK_HOLE)
251 data_ofs = isize;
252 goto found;
253 }
254
255 pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);
256
257 dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
258
259 for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
260 set_new_dnode(&dn, inode, NULL, NULL, 0);
261 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
262 if (err && err != -ENOENT) {
263 goto fail;
264 } else if (err == -ENOENT) {
265 /* direct node is not exist */
266 if (whence == SEEK_DATA) {
267 pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
268 F2FS_I(inode));
269 continue;
270 } else {
271 goto found;
272 }
273 }
274
275 end_offset = IS_INODE(dn.node_page) ?
276 ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK;
277
278 /* find data/hole in dnode block */
279 for (; dn.ofs_in_node < end_offset;
280 dn.ofs_in_node++, pgofs++,
281 data_ofs = pgofs << PAGE_CACHE_SHIFT) {
282 block_t blkaddr;
283 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
284
285 if (__found_offset(blkaddr, dirty, pgofs, whence)) {
286 f2fs_put_dnode(&dn);
287 goto found;
288 }
289 }
290 f2fs_put_dnode(&dn);
291 }
292
293 if (whence == SEEK_DATA)
294 goto fail;
295 found:
296 if (whence == SEEK_HOLE && data_ofs > isize)
297 data_ofs = isize;
298 mutex_unlock(&inode->i_mutex);
299 return vfs_setpos(file, data_ofs, maxbytes);
300 fail:
301 mutex_unlock(&inode->i_mutex);
302 return -ENXIO;
303 }
304
305 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
306 {
307 struct inode *inode = file->f_mapping->host;
308 loff_t maxbytes = inode->i_sb->s_maxbytes;
309
310 switch (whence) {
311 case SEEK_SET:
312 case SEEK_CUR:
313 case SEEK_END:
314 return generic_file_llseek_size(file, offset, whence,
315 maxbytes, i_size_read(inode));
316 case SEEK_DATA:
317 case SEEK_HOLE:
318 return f2fs_seek_block(file, offset, whence);
319 }
320
321 return -EINVAL;
322 }
323
324 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
325 {
326 file_accessed(file);
327 vma->vm_ops = &f2fs_file_vm_ops;
328 return 0;
329 }
330
331 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
332 {
333 int nr_free = 0, ofs = dn->ofs_in_node;
334 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
335 struct f2fs_node *raw_node;
336 __le32 *addr;
337
338 raw_node = F2FS_NODE(dn->node_page);
339 addr = blkaddr_in_node(raw_node) + ofs;
340
341 for (; count > 0; count--, addr++, dn->ofs_in_node++) {
342 block_t blkaddr = le32_to_cpu(*addr);
343 if (blkaddr == NULL_ADDR)
344 continue;
345
346 update_extent_cache(NULL_ADDR, dn);
347 invalidate_blocks(sbi, blkaddr);
348 nr_free++;
349 }
350 if (nr_free) {
351 dec_valid_block_count(sbi, dn->inode, nr_free);
352 set_page_dirty(dn->node_page);
353 sync_inode_page(dn);
354 }
355 dn->ofs_in_node = ofs;
356
357 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
358 dn->ofs_in_node, nr_free);
359 return nr_free;
360 }
361
362 void truncate_data_blocks(struct dnode_of_data *dn)
363 {
364 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
365 }
366
367 static void truncate_partial_data_page(struct inode *inode, u64 from)
368 {
369 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
370 struct page *page;
371
372 if (f2fs_has_inline_data(inode))
373 return truncate_inline_data(inode, from);
374
375 if (!offset)
376 return;
377
378 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
379 if (IS_ERR(page))
380 return;
381
382 lock_page(page);
383 if (unlikely(page->mapping != inode->i_mapping)) {
384 f2fs_put_page(page, 1);
385 return;
386 }
387 f2fs_wait_on_page_writeback(page, DATA);
388 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
389 set_page_dirty(page);
390 f2fs_put_page(page, 1);
391 }
392
393 int truncate_blocks(struct inode *inode, u64 from)
394 {
395 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
396 unsigned int blocksize = inode->i_sb->s_blocksize;
397 struct dnode_of_data dn;
398 pgoff_t free_from;
399 int count = 0, err = 0;
400
401 trace_f2fs_truncate_blocks_enter(inode, from);
402
403 if (f2fs_has_inline_data(inode))
404 goto done;
405
406 free_from = (pgoff_t)
407 ((from + blocksize - 1) >> (sbi->log_blocksize));
408
409 f2fs_lock_op(sbi);
410
411 set_new_dnode(&dn, inode, NULL, NULL, 0);
412 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
413 if (err) {
414 if (err == -ENOENT)
415 goto free_next;
416 f2fs_unlock_op(sbi);
417 trace_f2fs_truncate_blocks_exit(inode, err);
418 return err;
419 }
420
421 count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
422
423 count -= dn.ofs_in_node;
424 f2fs_bug_on(count < 0);
425
426 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
427 truncate_data_blocks_range(&dn, count);
428 free_from += count;
429 }
430
431 f2fs_put_dnode(&dn);
432 free_next:
433 err = truncate_inode_blocks(inode, free_from);
434 f2fs_unlock_op(sbi);
435 done:
436 /* lastly zero out the first data page */
437 truncate_partial_data_page(inode, from);
438
439 trace_f2fs_truncate_blocks_exit(inode, err);
440 return err;
441 }
442
443 void f2fs_truncate(struct inode *inode)
444 {
445 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
446 S_ISLNK(inode->i_mode)))
447 return;
448
449 trace_f2fs_truncate(inode);
450
451 if (!truncate_blocks(inode, i_size_read(inode))) {
452 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
453 mark_inode_dirty(inode);
454 }
455 }
456
457 int f2fs_getattr(struct vfsmount *mnt,
458 struct dentry *dentry, struct kstat *stat)
459 {
460 struct inode *inode = dentry->d_inode;
461 generic_fillattr(inode, stat);
462 stat->blocks <<= 3;
463 return 0;
464 }
465
466 #ifdef CONFIG_F2FS_FS_POSIX_ACL
467 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
468 {
469 struct f2fs_inode_info *fi = F2FS_I(inode);
470 unsigned int ia_valid = attr->ia_valid;
471
472 if (ia_valid & ATTR_UID)
473 inode->i_uid = attr->ia_uid;
474 if (ia_valid & ATTR_GID)
475 inode->i_gid = attr->ia_gid;
476 if (ia_valid & ATTR_ATIME)
477 inode->i_atime = timespec_trunc(attr->ia_atime,
478 inode->i_sb->s_time_gran);
479 if (ia_valid & ATTR_MTIME)
480 inode->i_mtime = timespec_trunc(attr->ia_mtime,
481 inode->i_sb->s_time_gran);
482 if (ia_valid & ATTR_CTIME)
483 inode->i_ctime = timespec_trunc(attr->ia_ctime,
484 inode->i_sb->s_time_gran);
485 if (ia_valid & ATTR_MODE) {
486 umode_t mode = attr->ia_mode;
487
488 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
489 mode &= ~S_ISGID;
490 set_acl_inode(fi, mode);
491 }
492 }
493 #else
494 #define __setattr_copy setattr_copy
495 #endif
496
497 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
498 {
499 struct inode *inode = dentry->d_inode;
500 struct f2fs_inode_info *fi = F2FS_I(inode);
501 int err;
502
503 err = inode_change_ok(inode, attr);
504 if (err)
505 return err;
506
507 if ((attr->ia_valid & ATTR_SIZE) &&
508 attr->ia_size != i_size_read(inode)) {
509 err = f2fs_convert_inline_data(inode, attr->ia_size);
510 if (err)
511 return err;
512
513 truncate_setsize(inode, attr->ia_size);
514 f2fs_truncate(inode);
515 f2fs_balance_fs(F2FS_SB(inode->i_sb));
516 }
517
518 __setattr_copy(inode, attr);
519
520 if (attr->ia_valid & ATTR_MODE) {
521 err = posix_acl_chmod(inode, get_inode_mode(inode));
522 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
523 inode->i_mode = fi->i_acl_mode;
524 clear_inode_flag(fi, FI_ACL_MODE);
525 }
526 }
527
528 mark_inode_dirty(inode);
529 return err;
530 }
531
532 const struct inode_operations f2fs_file_inode_operations = {
533 .getattr = f2fs_getattr,
534 .setattr = f2fs_setattr,
535 .get_acl = f2fs_get_acl,
536 .set_acl = f2fs_set_acl,
537 #ifdef CONFIG_F2FS_FS_XATTR
538 .setxattr = generic_setxattr,
539 .getxattr = generic_getxattr,
540 .listxattr = f2fs_listxattr,
541 .removexattr = generic_removexattr,
542 #endif
543 .fiemap = f2fs_fiemap,
544 };
545
546 static void fill_zero(struct inode *inode, pgoff_t index,
547 loff_t start, loff_t len)
548 {
549 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
550 struct page *page;
551
552 if (!len)
553 return;
554
555 f2fs_balance_fs(sbi);
556
557 f2fs_lock_op(sbi);
558 page = get_new_data_page(inode, NULL, index, false);
559 f2fs_unlock_op(sbi);
560
561 if (!IS_ERR(page)) {
562 f2fs_wait_on_page_writeback(page, DATA);
563 zero_user(page, start, len);
564 set_page_dirty(page);
565 f2fs_put_page(page, 1);
566 }
567 }
568
569 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
570 {
571 pgoff_t index;
572 int err;
573
574 for (index = pg_start; index < pg_end; index++) {
575 struct dnode_of_data dn;
576
577 set_new_dnode(&dn, inode, NULL, NULL, 0);
578 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
579 if (err) {
580 if (err == -ENOENT)
581 continue;
582 return err;
583 }
584
585 if (dn.data_blkaddr != NULL_ADDR)
586 truncate_data_blocks_range(&dn, 1);
587 f2fs_put_dnode(&dn);
588 }
589 return 0;
590 }
591
592 static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
593 {
594 pgoff_t pg_start, pg_end;
595 loff_t off_start, off_end;
596 int ret = 0;
597
598 ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1);
599 if (ret)
600 return ret;
601
602 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
603 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
604
605 off_start = offset & (PAGE_CACHE_SIZE - 1);
606 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
607
608 if (pg_start == pg_end) {
609 fill_zero(inode, pg_start, off_start,
610 off_end - off_start);
611 } else {
612 if (off_start)
613 fill_zero(inode, pg_start++, off_start,
614 PAGE_CACHE_SIZE - off_start);
615 if (off_end)
616 fill_zero(inode, pg_end, 0, off_end);
617
618 if (pg_start < pg_end) {
619 struct address_space *mapping = inode->i_mapping;
620 loff_t blk_start, blk_end;
621 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
622
623 f2fs_balance_fs(sbi);
624
625 blk_start = pg_start << PAGE_CACHE_SHIFT;
626 blk_end = pg_end << PAGE_CACHE_SHIFT;
627 truncate_inode_pages_range(mapping, blk_start,
628 blk_end - 1);
629
630 f2fs_lock_op(sbi);
631 ret = truncate_hole(inode, pg_start, pg_end);
632 f2fs_unlock_op(sbi);
633 }
634 }
635
636 return ret;
637 }
638
639 static int expand_inode_data(struct inode *inode, loff_t offset,
640 loff_t len, int mode)
641 {
642 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
643 pgoff_t index, pg_start, pg_end;
644 loff_t new_size = i_size_read(inode);
645 loff_t off_start, off_end;
646 int ret = 0;
647
648 ret = inode_newsize_ok(inode, (len + offset));
649 if (ret)
650 return ret;
651
652 ret = f2fs_convert_inline_data(inode, offset + len);
653 if (ret)
654 return ret;
655
656 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
657 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
658
659 off_start = offset & (PAGE_CACHE_SIZE - 1);
660 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
661
662 f2fs_lock_op(sbi);
663
664 for (index = pg_start; index <= pg_end; index++) {
665 struct dnode_of_data dn;
666
667 if (index == pg_end && !off_end)
668 goto noalloc;
669
670 set_new_dnode(&dn, inode, NULL, NULL, 0);
671 ret = f2fs_reserve_block(&dn, index);
672 if (ret)
673 break;
674 noalloc:
675 if (pg_start == pg_end)
676 new_size = offset + len;
677 else if (index == pg_start && off_start)
678 new_size = (index + 1) << PAGE_CACHE_SHIFT;
679 else if (index == pg_end)
680 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
681 else
682 new_size += PAGE_CACHE_SIZE;
683 }
684
685 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
686 i_size_read(inode) < new_size) {
687 i_size_write(inode, new_size);
688 mark_inode_dirty(inode);
689 update_inode_page(inode);
690 }
691 f2fs_unlock_op(sbi);
692
693 return ret;
694 }
695
696 static long f2fs_fallocate(struct file *file, int mode,
697 loff_t offset, loff_t len)
698 {
699 struct inode *inode = file_inode(file);
700 long ret;
701
702 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
703 return -EOPNOTSUPP;
704
705 mutex_lock(&inode->i_mutex);
706
707 if (mode & FALLOC_FL_PUNCH_HOLE)
708 ret = punch_hole(inode, offset, len);
709 else
710 ret = expand_inode_data(inode, offset, len, mode);
711
712 if (!ret) {
713 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
714 mark_inode_dirty(inode);
715 }
716
717 mutex_unlock(&inode->i_mutex);
718
719 trace_f2fs_fallocate(inode, mode, offset, len, ret);
720 return ret;
721 }
722
723 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
724 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
725
726 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
727 {
728 if (S_ISDIR(mode))
729 return flags;
730 else if (S_ISREG(mode))
731 return flags & F2FS_REG_FLMASK;
732 else
733 return flags & F2FS_OTHER_FLMASK;
734 }
735
736 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
737 {
738 struct inode *inode = file_inode(filp);
739 struct f2fs_inode_info *fi = F2FS_I(inode);
740 unsigned int flags;
741 int ret;
742
743 switch (cmd) {
744 case F2FS_IOC_GETFLAGS:
745 flags = fi->i_flags & FS_FL_USER_VISIBLE;
746 return put_user(flags, (int __user *) arg);
747 case F2FS_IOC_SETFLAGS:
748 {
749 unsigned int oldflags;
750
751 ret = mnt_want_write_file(filp);
752 if (ret)
753 return ret;
754
755 if (!inode_owner_or_capable(inode)) {
756 ret = -EACCES;
757 goto out;
758 }
759
760 if (get_user(flags, (int __user *) arg)) {
761 ret = -EFAULT;
762 goto out;
763 }
764
765 flags = f2fs_mask_flags(inode->i_mode, flags);
766
767 mutex_lock(&inode->i_mutex);
768
769 oldflags = fi->i_flags;
770
771 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
772 if (!capable(CAP_LINUX_IMMUTABLE)) {
773 mutex_unlock(&inode->i_mutex);
774 ret = -EPERM;
775 goto out;
776 }
777 }
778
779 flags = flags & FS_FL_USER_MODIFIABLE;
780 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
781 fi->i_flags = flags;
782 mutex_unlock(&inode->i_mutex);
783
784 f2fs_set_inode_flags(inode);
785 inode->i_ctime = CURRENT_TIME;
786 mark_inode_dirty(inode);
787 out:
788 mnt_drop_write_file(filp);
789 return ret;
790 }
791 default:
792 return -ENOTTY;
793 }
794 }
795
796 #ifdef CONFIG_COMPAT
797 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
798 {
799 switch (cmd) {
800 case F2FS_IOC32_GETFLAGS:
801 cmd = F2FS_IOC_GETFLAGS;
802 break;
803 case F2FS_IOC32_SETFLAGS:
804 cmd = F2FS_IOC_SETFLAGS;
805 break;
806 default:
807 return -ENOIOCTLCMD;
808 }
809 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
810 }
811 #endif
812
813 const struct file_operations f2fs_file_operations = {
814 .llseek = f2fs_llseek,
815 .read = new_sync_read,
816 .write = new_sync_write,
817 .read_iter = generic_file_read_iter,
818 .write_iter = generic_file_write_iter,
819 .open = generic_file_open,
820 .mmap = f2fs_file_mmap,
821 .fsync = f2fs_sync_file,
822 .fallocate = f2fs_fallocate,
823 .unlocked_ioctl = f2fs_ioctl,
824 #ifdef CONFIG_COMPAT
825 .compat_ioctl = f2fs_compat_ioctl,
826 #endif
827 .splice_read = generic_file_splice_read,
828 .splice_write = iter_file_splice_write,
829 };
Linux with added FPC-III support