?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Drivers: hv: util: introduce hv_utils_transport abstraction
[linux-2.6/btrfs-unstable.git] / fs / f2fs / file.c
blob2b52e48d74824dd67cfb8975a09b246a701a870f
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.h"
30 #include <trace/events/f2fs.h>
31
32 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
33 struct vm_fault *vmf)
34 {
35 struct page *page = vmf->page;
36 struct inode *inode = file_inode(vma->vm_file);
37 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
38 struct dnode_of_data dn;
39 int err;
40
41 f2fs_balance_fs(sbi);
42
43 sb_start_pagefault(inode->i_sb);
44
45 f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
46
47 /* block allocation */
48 f2fs_lock_op(sbi);
49 set_new_dnode(&dn, inode, NULL, NULL, 0);
50 err = f2fs_reserve_block(&dn, page->index);
51 if (err) {
52 f2fs_unlock_op(sbi);
53 goto out;
54 }
55 f2fs_put_dnode(&dn);
56 f2fs_unlock_op(sbi);
57
58 file_update_time(vma->vm_file);
59 lock_page(page);
60 if (unlikely(page->mapping != inode->i_mapping ||
61 page_offset(page) > i_size_read(inode) ||
62 !PageUptodate(page))) {
63 unlock_page(page);
64 err = -EFAULT;
65 goto out;
66 }
67
68 /*
69 * check to see if the page is mapped already (no holes)
70 */
71 if (PageMappedToDisk(page))
72 goto mapped;
73
74 /* page is wholly or partially inside EOF */
75 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
76 unsigned offset;
77 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
78 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
79 }
80 set_page_dirty(page);
81 SetPageUptodate(page);
82
83 trace_f2fs_vm_page_mkwrite(page, DATA);
84 mapped:
85 /* fill the page */
86 f2fs_wait_on_page_writeback(page, DATA);
87 out:
88 sb_end_pagefault(inode->i_sb);
89 return block_page_mkwrite_return(err);
90 }
91
92 static const struct vm_operations_struct f2fs_file_vm_ops = {
93 .fault = filemap_fault,
94 .map_pages = filemap_map_pages,
95 .page_mkwrite = f2fs_vm_page_mkwrite,
96 };
97
98 static int get_parent_ino(struct inode *inode, nid_t *pino)
99 {
100 struct dentry *dentry;
101
102 inode = igrab(inode);
103 dentry = d_find_any_alias(inode);
104 iput(inode);
105 if (!dentry)
106 return 0;
107
108 if (update_dent_inode(inode, &dentry->d_name)) {
109 dput(dentry);
110 return 0;
111 }
112
113 *pino = parent_ino(dentry);
114 dput(dentry);
115 return 1;
116 }
117
118 static inline bool need_do_checkpoint(struct inode *inode)
119 {
120 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
121 bool need_cp = false;
122
123 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
124 need_cp = true;
125 else if (file_wrong_pino(inode))
126 need_cp = true;
127 else if (!space_for_roll_forward(sbi))
128 need_cp = true;
129 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
130 need_cp = true;
131 else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
132 need_cp = true;
133 else if (test_opt(sbi, FASTBOOT))
134 need_cp = true;
135 else if (sbi->active_logs == 2)
136 need_cp = true;
137
138 return need_cp;
139 }
140
141 static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
142 {
143 struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
144 bool ret = false;
145 /* But we need to avoid that there are some inode updates */
146 if ((i && PageDirty(i)) || need_inode_block_update(sbi, ino))
147 ret = true;
148 f2fs_put_page(i, 0);
149 return ret;
150 }
151
152 static void try_to_fix_pino(struct inode *inode)
153 {
154 struct f2fs_inode_info *fi = F2FS_I(inode);
155 nid_t pino;
156
157 down_write(&fi->i_sem);
158 fi->xattr_ver = 0;
159 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
160 get_parent_ino(inode, &pino)) {
161 fi->i_pino = pino;
162 file_got_pino(inode);
163 up_write(&fi->i_sem);
164
165 mark_inode_dirty_sync(inode);
166 f2fs_write_inode(inode, NULL);
167 } else {
168 up_write(&fi->i_sem);
169 }
170 }
171
172 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
173 {
174 struct inode *inode = file->f_mapping->host;
175 struct f2fs_inode_info *fi = F2FS_I(inode);
176 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
177 nid_t ino = inode->i_ino;
178 int ret = 0;
179 bool need_cp = false;
180 struct writeback_control wbc = {
181 .sync_mode = WB_SYNC_ALL,
182 .nr_to_write = LONG_MAX,
183 .for_reclaim = 0,
184 };
185
186 if (unlikely(f2fs_readonly(inode->i_sb)))
187 return 0;
188
189 trace_f2fs_sync_file_enter(inode);
190
191 /* if fdatasync is triggered, let's do in-place-update */
192 if (get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
193 set_inode_flag(fi, FI_NEED_IPU);
194 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
195 clear_inode_flag(fi, FI_NEED_IPU);
196
197 if (ret) {
198 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
199 return ret;
200 }
201
202 /* if the inode is dirty, let's recover all the time */
203 if (!datasync && is_inode_flag_set(fi, FI_DIRTY_INODE)) {
204 update_inode_page(inode);
205 goto go_write;
206 }
207
208 /*
209 * if there is no written data, don't waste time to write recovery info.
210 */
211 if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
212 !exist_written_data(sbi, ino, APPEND_INO)) {
213
214 /* it may call write_inode just prior to fsync */
215 if (need_inode_page_update(sbi, ino))
216 goto go_write;
217
218 if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
219 exist_written_data(sbi, ino, UPDATE_INO))
220 goto flush_out;
221 goto out;
222 }
223 go_write:
224 /* guarantee free sections for fsync */
225 f2fs_balance_fs(sbi);
226
227 /*
228 * Both of fdatasync() and fsync() are able to be recovered from
229 * sudden-power-off.
230 */
231 down_read(&fi->i_sem);
232 need_cp = need_do_checkpoint(inode);
233 up_read(&fi->i_sem);
234
235 if (need_cp) {
236 /* all the dirty node pages should be flushed for POR */
237 ret = f2fs_sync_fs(inode->i_sb, 1);
238
239 /*
240 * We've secured consistency through sync_fs. Following pino
241 * will be used only for fsynced inodes after checkpoint.
242 */
243 try_to_fix_pino(inode);
244 clear_inode_flag(fi, FI_APPEND_WRITE);
245 clear_inode_flag(fi, FI_UPDATE_WRITE);
246 goto out;
247 }
248 sync_nodes:
249 sync_node_pages(sbi, ino, &wbc);
250
251 /* if cp_error was enabled, we should avoid infinite loop */
252 if (unlikely(f2fs_cp_error(sbi)))
253 goto out;
254
255 if (need_inode_block_update(sbi, ino)) {
256 mark_inode_dirty_sync(inode);
257 f2fs_write_inode(inode, NULL);
258 goto sync_nodes;
259 }
260
261 ret = wait_on_node_pages_writeback(sbi, ino);
262 if (ret)
263 goto out;
264
265 /* once recovery info is written, don't need to tack this */
266 remove_dirty_inode(sbi, ino, APPEND_INO);
267 clear_inode_flag(fi, FI_APPEND_WRITE);
268 flush_out:
269 remove_dirty_inode(sbi, ino, UPDATE_INO);
270 clear_inode_flag(fi, FI_UPDATE_WRITE);
271 ret = f2fs_issue_flush(sbi);
272 out:
273 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
274 f2fs_trace_ios(NULL, NULL, 1);
275 return ret;
276 }
277
278 static pgoff_t __get_first_dirty_index(struct address_space *mapping,
279 pgoff_t pgofs, int whence)
280 {
281 struct pagevec pvec;
282 int nr_pages;
283
284 if (whence != SEEK_DATA)
285 return 0;
286
287 /* find first dirty page index */
288 pagevec_init(&pvec, 0);
289 nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
290 PAGECACHE_TAG_DIRTY, 1);
291 pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
292 pagevec_release(&pvec);
293 return pgofs;
294 }
295
296 static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
297 int whence)
298 {
299 switch (whence) {
300 case SEEK_DATA:
301 if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
302 (blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
303 return true;
304 break;
305 case SEEK_HOLE:
306 if (blkaddr == NULL_ADDR)
307 return true;
308 break;
309 }
310 return false;
311 }
312
313 static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
314 {
315 struct inode *inode = file->f_mapping->host;
316 loff_t maxbytes = inode->i_sb->s_maxbytes;
317 struct dnode_of_data dn;
318 pgoff_t pgofs, end_offset, dirty;
319 loff_t data_ofs = offset;
320 loff_t isize;
321 int err = 0;
322
323 mutex_lock(&inode->i_mutex);
324
325 isize = i_size_read(inode);
326 if (offset >= isize)
327 goto fail;
328
329 /* handle inline data case */
330 if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
331 if (whence == SEEK_HOLE)
332 data_ofs = isize;
333 goto found;
334 }
335
336 pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);
337
338 dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
339
340 for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
341 set_new_dnode(&dn, inode, NULL, NULL, 0);
342 err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
343 if (err && err != -ENOENT) {
344 goto fail;
345 } else if (err == -ENOENT) {
346 /* direct node does not exists */
347 if (whence == SEEK_DATA) {
348 pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
349 F2FS_I(inode));
350 continue;
351 } else {
352 goto found;
353 }
354 }
355
356 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
357
358 /* find data/hole in dnode block */
359 for (; dn.ofs_in_node < end_offset;
360 dn.ofs_in_node++, pgofs++,
361 data_ofs = (loff_t)pgofs << PAGE_CACHE_SHIFT) {
362 block_t blkaddr;
363 blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
364
365 if (__found_offset(blkaddr, dirty, pgofs, whence)) {
366 f2fs_put_dnode(&dn);
367 goto found;
368 }
369 }
370 f2fs_put_dnode(&dn);
371 }
372
373 if (whence == SEEK_DATA)
374 goto fail;
375 found:
376 if (whence == SEEK_HOLE && data_ofs > isize)
377 data_ofs = isize;
378 mutex_unlock(&inode->i_mutex);
379 return vfs_setpos(file, data_ofs, maxbytes);
380 fail:
381 mutex_unlock(&inode->i_mutex);
382 return -ENXIO;
383 }
384
385 static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
386 {
387 struct inode *inode = file->f_mapping->host;
388 loff_t maxbytes = inode->i_sb->s_maxbytes;
389
390 switch (whence) {
391 case SEEK_SET:
392 case SEEK_CUR:
393 case SEEK_END:
394 return generic_file_llseek_size(file, offset, whence,
395 maxbytes, i_size_read(inode));
396 case SEEK_DATA:
397 case SEEK_HOLE:
398 if (offset < 0)
399 return -ENXIO;
400 return f2fs_seek_block(file, offset, whence);
401 }
402
403 return -EINVAL;
404 }
405
406 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
407 {
408 struct inode *inode = file_inode(file);
409
410 /* we don't need to use inline_data strictly */
411 if (f2fs_has_inline_data(inode)) {
412 int err = f2fs_convert_inline_inode(inode);
413 if (err)
414 return err;
415 }
416
417 file_accessed(file);
418 vma->vm_ops = &f2fs_file_vm_ops;
419 return 0;
420 }
421
422 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
423 {
424 int nr_free = 0, ofs = dn->ofs_in_node;
425 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
426 struct f2fs_node *raw_node;
427 __le32 *addr;
428
429 raw_node = F2FS_NODE(dn->node_page);
430 addr = blkaddr_in_node(raw_node) + ofs;
431
432 for (; count > 0; count--, addr++, dn->ofs_in_node++) {
433 block_t blkaddr = le32_to_cpu(*addr);
434 if (blkaddr == NULL_ADDR)
435 continue;
436
437 dn->data_blkaddr = NULL_ADDR;
438 set_data_blkaddr(dn);
439 f2fs_update_extent_cache(dn);
440 invalidate_blocks(sbi, blkaddr);
441 if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
442 clear_inode_flag(F2FS_I(dn->inode),
443 FI_FIRST_BLOCK_WRITTEN);
444 nr_free++;
445 }
446 if (nr_free) {
447 dec_valid_block_count(sbi, dn->inode, nr_free);
448 set_page_dirty(dn->node_page);
449 sync_inode_page(dn);
450 }
451 dn->ofs_in_node = ofs;
452
453 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
454 dn->ofs_in_node, nr_free);
455 return nr_free;
456 }
457
458 void truncate_data_blocks(struct dnode_of_data *dn)
459 {
460 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
461 }
462
463 static int truncate_partial_data_page(struct inode *inode, u64 from,
464 bool force)
465 {
466 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
467 struct page *page;
468
469 if (!offset && !force)
470 return 0;
471
472 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, force);
473 if (IS_ERR(page))
474 return 0;
475
476 lock_page(page);
477 if (unlikely(!PageUptodate(page) ||
478 page->mapping != inode->i_mapping))
479 goto out;
480
481 f2fs_wait_on_page_writeback(page, DATA);
482 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
483 if (!force)
484 set_page_dirty(page);
485 out:
486 f2fs_put_page(page, 1);
487 return 0;
488 }
489
490 int truncate_blocks(struct inode *inode, u64 from, bool lock)
491 {
492 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
493 unsigned int blocksize = inode->i_sb->s_blocksize;
494 struct dnode_of_data dn;
495 pgoff_t free_from;
496 int count = 0, err = 0;
497 struct page *ipage;
498 bool truncate_page = false;
499
500 trace_f2fs_truncate_blocks_enter(inode, from);
501
502 free_from = (pgoff_t)F2FS_BYTES_TO_BLK(from + blocksize - 1);
503
504 if (lock)
505 f2fs_lock_op(sbi);
506
507 ipage = get_node_page(sbi, inode->i_ino);
508 if (IS_ERR(ipage)) {
509 err = PTR_ERR(ipage);
510 goto out;
511 }
512
513 if (f2fs_has_inline_data(inode)) {
514 if (truncate_inline_inode(ipage, from))
515 set_page_dirty(ipage);
516 f2fs_put_page(ipage, 1);
517 truncate_page = true;
518 goto out;
519 }
520
521 set_new_dnode(&dn, inode, ipage, NULL, 0);
522 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
523 if (err) {
524 if (err == -ENOENT)
525 goto free_next;
526 goto out;
527 }
528
529 count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
530
531 count -= dn.ofs_in_node;
532 f2fs_bug_on(sbi, count < 0);
533
534 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
535 truncate_data_blocks_range(&dn, count);
536 free_from += count;
537 }
538
539 f2fs_put_dnode(&dn);
540 free_next:
541 err = truncate_inode_blocks(inode, free_from);
542 out:
543 if (lock)
544 f2fs_unlock_op(sbi);
545
546 /* lastly zero out the first data page */
547 if (!err)
548 err = truncate_partial_data_page(inode, from, truncate_page);
549
550 trace_f2fs_truncate_blocks_exit(inode, err);
551 return err;
552 }
553
554 void f2fs_truncate(struct inode *inode)
555 {
556 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
557 S_ISLNK(inode->i_mode)))
558 return;
559
560 trace_f2fs_truncate(inode);
561
562 /* we should check inline_data size */
563 if (f2fs_has_inline_data(inode) && !f2fs_may_inline(inode)) {
564 if (f2fs_convert_inline_inode(inode))
565 return;
566 }
567
568 if (!truncate_blocks(inode, i_size_read(inode), true)) {
569 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
570 mark_inode_dirty(inode);
571 }
572 }
573
574 int f2fs_getattr(struct vfsmount *mnt,
575 struct dentry *dentry, struct kstat *stat)
576 {
577 struct inode *inode = d_inode(dentry);
578 generic_fillattr(inode, stat);
579 stat->blocks <<= 3;
580 return 0;
581 }
582
583 #ifdef CONFIG_F2FS_FS_POSIX_ACL
584 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
585 {
586 struct f2fs_inode_info *fi = F2FS_I(inode);
587 unsigned int ia_valid = attr->ia_valid;
588
589 if (ia_valid & ATTR_UID)
590 inode->i_uid = attr->ia_uid;
591 if (ia_valid & ATTR_GID)
592 inode->i_gid = attr->ia_gid;
593 if (ia_valid & ATTR_ATIME)
594 inode->i_atime = timespec_trunc(attr->ia_atime,
595 inode->i_sb->s_time_gran);
596 if (ia_valid & ATTR_MTIME)
597 inode->i_mtime = timespec_trunc(attr->ia_mtime,
598 inode->i_sb->s_time_gran);
599 if (ia_valid & ATTR_CTIME)
600 inode->i_ctime = timespec_trunc(attr->ia_ctime,
601 inode->i_sb->s_time_gran);
602 if (ia_valid & ATTR_MODE) {
603 umode_t mode = attr->ia_mode;
604
605 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
606 mode &= ~S_ISGID;
607 set_acl_inode(fi, mode);
608 }
609 }
610 #else
611 #define __setattr_copy setattr_copy
612 #endif
613
614 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
615 {
616 struct inode *inode = d_inode(dentry);
617 struct f2fs_inode_info *fi = F2FS_I(inode);
618 int err;
619
620 err = inode_change_ok(inode, attr);
621 if (err)
622 return err;
623
624 if (attr->ia_valid & ATTR_SIZE) {
625 if (attr->ia_size != i_size_read(inode)) {
626 truncate_setsize(inode, attr->ia_size);
627 f2fs_truncate(inode);
628 f2fs_balance_fs(F2FS_I_SB(inode));
629 } else {
630 /*
631 * giving a chance to truncate blocks past EOF which
632 * are fallocated with FALLOC_FL_KEEP_SIZE.
633 */
634 f2fs_truncate(inode);
635 }
636 }
637
638 __setattr_copy(inode, attr);
639
640 if (attr->ia_valid & ATTR_MODE) {
641 err = posix_acl_chmod(inode, get_inode_mode(inode));
642 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
643 inode->i_mode = fi->i_acl_mode;
644 clear_inode_flag(fi, FI_ACL_MODE);
645 }
646 }
647
648 mark_inode_dirty(inode);
649 return err;
650 }
651
652 const struct inode_operations f2fs_file_inode_operations = {
653 .getattr = f2fs_getattr,
654 .setattr = f2fs_setattr,
655 .get_acl = f2fs_get_acl,
656 .set_acl = f2fs_set_acl,
657 #ifdef CONFIG_F2FS_FS_XATTR
658 .setxattr = generic_setxattr,
659 .getxattr = generic_getxattr,
660 .listxattr = f2fs_listxattr,
661 .removexattr = generic_removexattr,
662 #endif
663 .fiemap = f2fs_fiemap,
664 };
665
666 static void fill_zero(struct inode *inode, pgoff_t index,
667 loff_t start, loff_t len)
668 {
669 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
670 struct page *page;
671
672 if (!len)
673 return;
674
675 f2fs_balance_fs(sbi);
676
677 f2fs_lock_op(sbi);
678 page = get_new_data_page(inode, NULL, index, false);
679 f2fs_unlock_op(sbi);
680
681 if (!IS_ERR(page)) {
682 f2fs_wait_on_page_writeback(page, DATA);
683 zero_user(page, start, len);
684 set_page_dirty(page);
685 f2fs_put_page(page, 1);
686 }
687 }
688
689 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
690 {
691 pgoff_t index;
692 int err;
693
694 for (index = pg_start; index < pg_end; index++) {
695 struct dnode_of_data dn;
696
697 set_new_dnode(&dn, inode, NULL, NULL, 0);
698 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
699 if (err) {
700 if (err == -ENOENT)
701 continue;
702 return err;
703 }
704
705 if (dn.data_blkaddr != NULL_ADDR)
706 truncate_data_blocks_range(&dn, 1);
707 f2fs_put_dnode(&dn);
708 }
709 return 0;
710 }
711
712 static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
713 {
714 pgoff_t pg_start, pg_end;
715 loff_t off_start, off_end;
716 int ret = 0;
717
718 if (!S_ISREG(inode->i_mode))
719 return -EOPNOTSUPP;
720
721 /* skip punching hole beyond i_size */
722 if (offset >= inode->i_size)
723 return ret;
724
725 if (f2fs_has_inline_data(inode)) {
726 ret = f2fs_convert_inline_inode(inode);
727 if (ret)
728 return ret;
729 }
730
731 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
732 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
733
734 off_start = offset & (PAGE_CACHE_SIZE - 1);
735 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
736
737 if (pg_start == pg_end) {
738 fill_zero(inode, pg_start, off_start,
739 off_end - off_start);
740 } else {
741 if (off_start)
742 fill_zero(inode, pg_start++, off_start,
743 PAGE_CACHE_SIZE - off_start);
744 if (off_end)
745 fill_zero(inode, pg_end, 0, off_end);
746
747 if (pg_start < pg_end) {
748 struct address_space *mapping = inode->i_mapping;
749 loff_t blk_start, blk_end;
750 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
751
752 f2fs_balance_fs(sbi);
753
754 blk_start = pg_start << PAGE_CACHE_SHIFT;
755 blk_end = pg_end << PAGE_CACHE_SHIFT;
756 truncate_inode_pages_range(mapping, blk_start,
757 blk_end - 1);
758
759 f2fs_lock_op(sbi);
760 ret = truncate_hole(inode, pg_start, pg_end);
761 f2fs_unlock_op(sbi);
762 }
763 }
764
765 return ret;
766 }
767
768 static int expand_inode_data(struct inode *inode, loff_t offset,
769 loff_t len, int mode)
770 {
771 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
772 pgoff_t index, pg_start, pg_end;
773 loff_t new_size = i_size_read(inode);
774 loff_t off_start, off_end;
775 int ret = 0;
776
777 f2fs_balance_fs(sbi);
778
779 ret = inode_newsize_ok(inode, (len + offset));
780 if (ret)
781 return ret;
782
783 if (f2fs_has_inline_data(inode)) {
784 ret = f2fs_convert_inline_inode(inode);
785 if (ret)
786 return ret;
787 }
788
789 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
790 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
791
792 off_start = offset & (PAGE_CACHE_SIZE - 1);
793 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
794
795 f2fs_lock_op(sbi);
796
797 for (index = pg_start; index <= pg_end; index++) {
798 struct dnode_of_data dn;
799
800 if (index == pg_end && !off_end)
801 goto noalloc;
802
803 set_new_dnode(&dn, inode, NULL, NULL, 0);
804 ret = f2fs_reserve_block(&dn, index);
805 if (ret)
806 break;
807 noalloc:
808 if (pg_start == pg_end)
809 new_size = offset + len;
810 else if (index == pg_start && off_start)
811 new_size = (index + 1) << PAGE_CACHE_SHIFT;
812 else if (index == pg_end)
813 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
814 else
815 new_size += PAGE_CACHE_SIZE;
816 }
817
818 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
819 i_size_read(inode) < new_size) {
820 i_size_write(inode, new_size);
821 mark_inode_dirty(inode);
822 update_inode_page(inode);
823 }
824 f2fs_unlock_op(sbi);
825
826 return ret;
827 }
828
829 static long f2fs_fallocate(struct file *file, int mode,
830 loff_t offset, loff_t len)
831 {
832 struct inode *inode = file_inode(file);
833 long ret;
834
835 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
836 return -EOPNOTSUPP;
837
838 mutex_lock(&inode->i_mutex);
839
840 if (mode & FALLOC_FL_PUNCH_HOLE)
841 ret = punch_hole(inode, offset, len);
842 else
843 ret = expand_inode_data(inode, offset, len, mode);
844
845 if (!ret) {
846 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
847 mark_inode_dirty(inode);
848 }
849
850 mutex_unlock(&inode->i_mutex);
851
852 trace_f2fs_fallocate(inode, mode, offset, len, ret);
853 return ret;
854 }
855
856 static int f2fs_release_file(struct inode *inode, struct file *filp)
857 {
858 /* some remained atomic pages should discarded */
859 if (f2fs_is_atomic_file(inode))
860 commit_inmem_pages(inode, true);
861 if (f2fs_is_volatile_file(inode)) {
862 set_inode_flag(F2FS_I(inode), FI_DROP_CACHE);
863 filemap_fdatawrite(inode->i_mapping);
864 clear_inode_flag(F2FS_I(inode), FI_DROP_CACHE);
865 }
866 return 0;
867 }
868
869 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
870 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
871
872 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
873 {
874 if (S_ISDIR(mode))
875 return flags;
876 else if (S_ISREG(mode))
877 return flags & F2FS_REG_FLMASK;
878 else
879 return flags & F2FS_OTHER_FLMASK;
880 }
881
882 static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
883 {
884 struct inode *inode = file_inode(filp);
885 struct f2fs_inode_info *fi = F2FS_I(inode);
886 unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
887 return put_user(flags, (int __user *)arg);
888 }
889
890 static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
891 {
892 struct inode *inode = file_inode(filp);
893 struct f2fs_inode_info *fi = F2FS_I(inode);
894 unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
895 unsigned int oldflags;
896 int ret;
897
898 ret = mnt_want_write_file(filp);
899 if (ret)
900 return ret;
901
902 if (!inode_owner_or_capable(inode)) {
903 ret = -EACCES;
904 goto out;
905 }
906
907 if (get_user(flags, (int __user *)arg)) {
908 ret = -EFAULT;
909 goto out;
910 }
911
912 flags = f2fs_mask_flags(inode->i_mode, flags);
913
914 mutex_lock(&inode->i_mutex);
915
916 oldflags = fi->i_flags;
917
918 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
919 if (!capable(CAP_LINUX_IMMUTABLE)) {
920 mutex_unlock(&inode->i_mutex);
921 ret = -EPERM;
922 goto out;
923 }
924 }
925
926 flags = flags & FS_FL_USER_MODIFIABLE;
927 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
928 fi->i_flags = flags;
929 mutex_unlock(&inode->i_mutex);
930
931 f2fs_set_inode_flags(inode);
932 inode->i_ctime = CURRENT_TIME;
933 mark_inode_dirty(inode);
934 out:
935 mnt_drop_write_file(filp);
936 return ret;
937 }
938
939 static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
940 {
941 struct inode *inode = file_inode(filp);
942
943 return put_user(inode->i_generation, (int __user *)arg);
944 }
945
946 static int f2fs_ioc_start_atomic_write(struct file *filp)
947 {
948 struct inode *inode = file_inode(filp);
949
950 if (!inode_owner_or_capable(inode))
951 return -EACCES;
952
953 f2fs_balance_fs(F2FS_I_SB(inode));
954
955 if (f2fs_is_atomic_file(inode))
956 return 0;
957
958 set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
959
960 return f2fs_convert_inline_inode(inode);
961 }
962
963 static int f2fs_ioc_commit_atomic_write(struct file *filp)
964 {
965 struct inode *inode = file_inode(filp);
966 int ret;
967
968 if (!inode_owner_or_capable(inode))
969 return -EACCES;
970
971 if (f2fs_is_volatile_file(inode))
972 return 0;
973
974 ret = mnt_want_write_file(filp);
975 if (ret)
976 return ret;
977
978 if (f2fs_is_atomic_file(inode))
979 commit_inmem_pages(inode, false);
980
981 ret = f2fs_sync_file(filp, 0, LONG_MAX, 0);
982 mnt_drop_write_file(filp);
983 clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
984 return ret;
985 }
986
987 static int f2fs_ioc_start_volatile_write(struct file *filp)
988 {
989 struct inode *inode = file_inode(filp);
990
991 if (!inode_owner_or_capable(inode))
992 return -EACCES;
993
994 if (f2fs_is_volatile_file(inode))
995 return 0;
996
997 set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
998
999 return f2fs_convert_inline_inode(inode);
1000 }
1001
1002 static int f2fs_ioc_release_volatile_write(struct file *filp)
1003 {
1004 struct inode *inode = file_inode(filp);
1005
1006 if (!inode_owner_or_capable(inode))
1007 return -EACCES;
1008
1009 if (!f2fs_is_volatile_file(inode))
1010 return 0;
1011
1012 if (!f2fs_is_first_block_written(inode))
1013 return truncate_partial_data_page(inode, 0, true);
1014
1015 punch_hole(inode, 0, F2FS_BLKSIZE);
1016 return 0;
1017 }
1018
1019 static int f2fs_ioc_abort_volatile_write(struct file *filp)
1020 {
1021 struct inode *inode = file_inode(filp);
1022 int ret;
1023
1024 if (!inode_owner_or_capable(inode))
1025 return -EACCES;
1026
1027 ret = mnt_want_write_file(filp);
1028 if (ret)
1029 return ret;
1030
1031 f2fs_balance_fs(F2FS_I_SB(inode));
1032
1033 if (f2fs_is_atomic_file(inode)) {
1034 commit_inmem_pages(inode, false);
1035 clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
1036 }
1037
1038 if (f2fs_is_volatile_file(inode)) {
1039 clear_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
1040 filemap_fdatawrite(inode->i_mapping);
1041 set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
1042 }
1043 mnt_drop_write_file(filp);
1044 return ret;
1045 }
1046
1047 static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
1048 {
1049 struct inode *inode = file_inode(filp);
1050 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1051 struct super_block *sb = sbi->sb;
1052 __u32 in;
1053
1054 if (!capable(CAP_SYS_ADMIN))
1055 return -EPERM;
1056
1057 if (get_user(in, (__u32 __user *)arg))
1058 return -EFAULT;
1059
1060 switch (in) {
1061 case F2FS_GOING_DOWN_FULLSYNC:
1062 sb = freeze_bdev(sb->s_bdev);
1063 if (sb && !IS_ERR(sb)) {
1064 f2fs_stop_checkpoint(sbi);
1065 thaw_bdev(sb->s_bdev, sb);
1066 }
1067 break;
1068 case F2FS_GOING_DOWN_METASYNC:
1069 /* do checkpoint only */
1070 f2fs_sync_fs(sb, 1);
1071 f2fs_stop_checkpoint(sbi);
1072 break;
1073 case F2FS_GOING_DOWN_NOSYNC:
1074 f2fs_stop_checkpoint(sbi);
1075 break;
1076 default:
1077 return -EINVAL;
1078 }
1079 return 0;
1080 }
1081
1082 static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
1083 {
1084 struct inode *inode = file_inode(filp);
1085 struct super_block *sb = inode->i_sb;
1086 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1087 struct fstrim_range range;
1088 int ret;
1089
1090 if (!capable(CAP_SYS_ADMIN))
1091 return -EPERM;
1092
1093 if (!blk_queue_discard(q))
1094 return -EOPNOTSUPP;
1095
1096 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1097 sizeof(range)))
1098 return -EFAULT;
1099
1100 range.minlen = max((unsigned int)range.minlen,
1101 q->limits.discard_granularity);
1102 ret = f2fs_trim_fs(F2FS_SB(sb), &range);
1103 if (ret < 0)
1104 return ret;
1105
1106 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1107 sizeof(range)))
1108 return -EFAULT;
1109 return 0;
1110 }
1111
1112 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1113 {
1114 switch (cmd) {
1115 case F2FS_IOC_GETFLAGS:
1116 return f2fs_ioc_getflags(filp, arg);
1117 case F2FS_IOC_SETFLAGS:
1118 return f2fs_ioc_setflags(filp, arg);
1119 case F2FS_IOC_GETVERSION:
1120 return f2fs_ioc_getversion(filp, arg);
1121 case F2FS_IOC_START_ATOMIC_WRITE:
1122 return f2fs_ioc_start_atomic_write(filp);
1123 case F2FS_IOC_COMMIT_ATOMIC_WRITE:
1124 return f2fs_ioc_commit_atomic_write(filp);
1125 case F2FS_IOC_START_VOLATILE_WRITE:
1126 return f2fs_ioc_start_volatile_write(filp);
1127 case F2FS_IOC_RELEASE_VOLATILE_WRITE:
1128 return f2fs_ioc_release_volatile_write(filp);
1129 case F2FS_IOC_ABORT_VOLATILE_WRITE:
1130 return f2fs_ioc_abort_volatile_write(filp);
1131 case F2FS_IOC_SHUTDOWN:
1132 return f2fs_ioc_shutdown(filp, arg);
1133 case FITRIM:
1134 return f2fs_ioc_fitrim(filp, arg);
1135 default:
1136 return -ENOTTY;
1137 }
1138 }
1139
1140 #ifdef CONFIG_COMPAT
1141 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1142 {
1143 switch (cmd) {
1144 case F2FS_IOC32_GETFLAGS:
1145 cmd = F2FS_IOC_GETFLAGS;
1146 break;
1147 case F2FS_IOC32_SETFLAGS:
1148 cmd = F2FS_IOC_SETFLAGS;
1149 break;
1150 default:
1151 return -ENOIOCTLCMD;
1152 }
1153 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1154 }
1155 #endif
1156
1157 const struct file_operations f2fs_file_operations = {
1158 .llseek = f2fs_llseek,
1159 .read_iter = generic_file_read_iter,
1160 .write_iter = generic_file_write_iter,
1161 .open = generic_file_open,
1162 .release = f2fs_release_file,
1163 .mmap = f2fs_file_mmap,
1164 .fsync = f2fs_sync_file,
1165 .fallocate = f2fs_fallocate,
1166 .unlocked_ioctl = f2fs_ioctl,
1167 #ifdef CONFIG_COMPAT
1168 .compat_ioctl = f2fs_compat_ioctl,
1169 #endif
1170 .splice_read = generic_file_splice_read,
1171 .splice_write = iter_file_splice_write,
1172 };
(deprecated) Btrfs devel tree