Commit | Line | Data |
---|---|---|
fbfa2cc5 JK |
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/falloc.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/mount.h> | |
20 | ||
21 | #include "f2fs.h" | |
22 | #include "node.h" | |
23 | #include "segment.h" | |
24 | #include "xattr.h" | |
25 | #include "acl.h" | |
26 | ||
27 | static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, | |
28 | struct vm_fault *vmf) | |
29 | { | |
30 | struct page *page = vmf->page; | |
31 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
32 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
33 | struct page *node_page; | |
34 | block_t old_blk_addr; | |
35 | struct dnode_of_data dn; | |
36 | int err; | |
37 | ||
38 | f2fs_balance_fs(sbi); | |
39 | ||
40 | sb_start_pagefault(inode->i_sb); | |
41 | ||
42 | mutex_lock_op(sbi, DATA_NEW); | |
43 | ||
44 | /* block allocation */ | |
45 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
46 | err = get_dnode_of_data(&dn, page->index, 0); | |
47 | if (err) { | |
48 | mutex_unlock_op(sbi, DATA_NEW); | |
49 | goto out; | |
50 | } | |
51 | ||
52 | old_blk_addr = dn.data_blkaddr; | |
53 | node_page = dn.node_page; | |
54 | ||
55 | if (old_blk_addr == NULL_ADDR) { | |
56 | err = reserve_new_block(&dn); | |
57 | if (err) { | |
58 | f2fs_put_dnode(&dn); | |
59 | mutex_unlock_op(sbi, DATA_NEW); | |
60 | goto out; | |
61 | } | |
62 | } | |
63 | f2fs_put_dnode(&dn); | |
64 | ||
65 | mutex_unlock_op(sbi, DATA_NEW); | |
66 | ||
67 | lock_page(page); | |
68 | if (page->mapping != inode->i_mapping || | |
69 | page_offset(page) >= i_size_read(inode) || | |
70 | !PageUptodate(page)) { | |
71 | unlock_page(page); | |
72 | err = -EFAULT; | |
73 | goto out; | |
74 | } | |
75 | ||
76 | /* | |
77 | * check to see if the page is mapped already (no holes) | |
78 | */ | |
79 | if (PageMappedToDisk(page)) | |
80 | goto out; | |
81 | ||
82 | /* fill the page */ | |
83 | wait_on_page_writeback(page); | |
84 | ||
85 | /* page is wholly or partially inside EOF */ | |
86 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) { | |
87 | unsigned offset; | |
88 | offset = i_size_read(inode) & ~PAGE_CACHE_MASK; | |
89 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
90 | } | |
91 | set_page_dirty(page); | |
92 | SetPageUptodate(page); | |
93 | ||
94 | file_update_time(vma->vm_file); | |
95 | out: | |
96 | sb_end_pagefault(inode->i_sb); | |
97 | return block_page_mkwrite_return(err); | |
98 | } | |
99 | ||
100 | static const struct vm_operations_struct f2fs_file_vm_ops = { | |
101 | .fault = filemap_fault, | |
102 | .page_mkwrite = f2fs_vm_page_mkwrite, | |
103 | }; | |
104 | ||
105 | static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode) | |
106 | { | |
107 | struct dentry *dentry; | |
108 | nid_t pino; | |
109 | ||
110 | inode = igrab(inode); | |
111 | dentry = d_find_any_alias(inode); | |
112 | if (!dentry) { | |
113 | iput(inode); | |
114 | return 0; | |
115 | } | |
116 | pino = dentry->d_parent->d_inode->i_ino; | |
117 | dput(dentry); | |
118 | iput(inode); | |
119 | return !is_checkpointed_node(sbi, pino); | |
120 | } | |
121 | ||
122 | int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) | |
123 | { | |
124 | struct inode *inode = file->f_mapping->host; | |
125 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
126 | unsigned long long cur_version; | |
127 | int ret = 0; | |
128 | bool need_cp = false; | |
129 | struct writeback_control wbc = { | |
130 | .sync_mode = WB_SYNC_ALL, | |
131 | .nr_to_write = LONG_MAX, | |
132 | .for_reclaim = 0, | |
133 | }; | |
134 | ||
135 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
136 | if (ret) | |
137 | return ret; | |
138 | ||
139 | mutex_lock(&inode->i_mutex); | |
140 | ||
141 | if (inode->i_sb->s_flags & MS_RDONLY) | |
142 | goto out; | |
143 | if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) | |
144 | goto out; | |
145 | ||
146 | mutex_lock(&sbi->cp_mutex); | |
147 | cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver); | |
148 | mutex_unlock(&sbi->cp_mutex); | |
149 | ||
150 | if (F2FS_I(inode)->data_version != cur_version && | |
151 | !(inode->i_state & I_DIRTY)) | |
152 | goto out; | |
153 | F2FS_I(inode)->data_version--; | |
154 | ||
155 | if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1) | |
156 | need_cp = true; | |
157 | if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP)) | |
158 | need_cp = true; | |
159 | if (!space_for_roll_forward(sbi)) | |
160 | need_cp = true; | |
161 | if (need_to_sync_dir(sbi, inode)) | |
162 | need_cp = true; | |
163 | ||
164 | f2fs_write_inode(inode, NULL); | |
165 | ||
166 | if (need_cp) { | |
167 | /* all the dirty node pages should be flushed for POR */ | |
168 | ret = f2fs_sync_fs(inode->i_sb, 1); | |
169 | clear_inode_flag(F2FS_I(inode), FI_NEED_CP); | |
170 | } else { | |
171 | while (sync_node_pages(sbi, inode->i_ino, &wbc) == 0) | |
172 | f2fs_write_inode(inode, NULL); | |
173 | filemap_fdatawait_range(sbi->node_inode->i_mapping, | |
174 | 0, LONG_MAX); | |
175 | } | |
176 | out: | |
177 | mutex_unlock(&inode->i_mutex); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
182 | { | |
183 | file_accessed(file); | |
184 | vma->vm_ops = &f2fs_file_vm_ops; | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int truncate_data_blocks_range(struct dnode_of_data *dn, int count) | |
189 | { | |
190 | int nr_free = 0, ofs = dn->ofs_in_node; | |
191 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
192 | struct f2fs_node *raw_node; | |
193 | __le32 *addr; | |
194 | ||
195 | raw_node = page_address(dn->node_page); | |
196 | addr = blkaddr_in_node(raw_node) + ofs; | |
197 | ||
198 | for ( ; count > 0; count--, addr++, dn->ofs_in_node++) { | |
199 | block_t blkaddr = le32_to_cpu(*addr); | |
200 | if (blkaddr == NULL_ADDR) | |
201 | continue; | |
202 | ||
203 | update_extent_cache(NULL_ADDR, dn); | |
204 | invalidate_blocks(sbi, blkaddr); | |
205 | dec_valid_block_count(sbi, dn->inode, 1); | |
206 | nr_free++; | |
207 | } | |
208 | if (nr_free) { | |
209 | set_page_dirty(dn->node_page); | |
210 | sync_inode_page(dn); | |
211 | } | |
212 | dn->ofs_in_node = ofs; | |
213 | return nr_free; | |
214 | } | |
215 | ||
216 | void truncate_data_blocks(struct dnode_of_data *dn) | |
217 | { | |
218 | truncate_data_blocks_range(dn, ADDRS_PER_BLOCK); | |
219 | } | |
220 | ||
221 | static void truncate_partial_data_page(struct inode *inode, u64 from) | |
222 | { | |
223 | unsigned offset = from & (PAGE_CACHE_SIZE - 1); | |
224 | struct page *page; | |
225 | ||
226 | if (!offset) | |
227 | return; | |
228 | ||
229 | page = find_data_page(inode, from >> PAGE_CACHE_SHIFT); | |
230 | if (IS_ERR(page)) | |
231 | return; | |
232 | ||
233 | lock_page(page); | |
234 | wait_on_page_writeback(page); | |
235 | zero_user(page, offset, PAGE_CACHE_SIZE - offset); | |
236 | set_page_dirty(page); | |
237 | f2fs_put_page(page, 1); | |
238 | } | |
239 | ||
240 | static int truncate_blocks(struct inode *inode, u64 from) | |
241 | { | |
242 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
243 | unsigned int blocksize = inode->i_sb->s_blocksize; | |
244 | struct dnode_of_data dn; | |
245 | pgoff_t free_from; | |
246 | int count = 0; | |
247 | int err; | |
248 | ||
249 | free_from = (pgoff_t) | |
250 | ((from + blocksize - 1) >> (sbi->log_blocksize)); | |
251 | ||
252 | mutex_lock_op(sbi, DATA_TRUNC); | |
253 | ||
254 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
255 | err = get_dnode_of_data(&dn, free_from, RDONLY_NODE); | |
256 | if (err) { | |
257 | if (err == -ENOENT) | |
258 | goto free_next; | |
259 | mutex_unlock_op(sbi, DATA_TRUNC); | |
260 | return err; | |
261 | } | |
262 | ||
263 | if (IS_INODE(dn.node_page)) | |
264 | count = ADDRS_PER_INODE; | |
265 | else | |
266 | count = ADDRS_PER_BLOCK; | |
267 | ||
268 | count -= dn.ofs_in_node; | |
269 | BUG_ON(count < 0); | |
270 | if (dn.ofs_in_node || IS_INODE(dn.node_page)) { | |
271 | truncate_data_blocks_range(&dn, count); | |
272 | free_from += count; | |
273 | } | |
274 | ||
275 | f2fs_put_dnode(&dn); | |
276 | free_next: | |
277 | err = truncate_inode_blocks(inode, free_from); | |
278 | mutex_unlock_op(sbi, DATA_TRUNC); | |
279 | ||
280 | /* lastly zero out the first data page */ | |
281 | truncate_partial_data_page(inode, from); | |
282 | ||
283 | return err; | |
284 | } | |
285 | ||
286 | void f2fs_truncate(struct inode *inode) | |
287 | { | |
288 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
289 | S_ISLNK(inode->i_mode))) | |
290 | return; | |
291 | ||
292 | if (!truncate_blocks(inode, i_size_read(inode))) { | |
293 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
294 | mark_inode_dirty(inode); | |
295 | } | |
296 | ||
297 | f2fs_balance_fs(F2FS_SB(inode->i_sb)); | |
298 | } | |
299 | ||
300 | static int f2fs_getattr(struct vfsmount *mnt, | |
301 | struct dentry *dentry, struct kstat *stat) | |
302 | { | |
303 | struct inode *inode = dentry->d_inode; | |
304 | generic_fillattr(inode, stat); | |
305 | stat->blocks <<= 3; | |
306 | return 0; | |
307 | } | |
308 | ||
309 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
310 | static void __setattr_copy(struct inode *inode, const struct iattr *attr) | |
311 | { | |
312 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
313 | unsigned int ia_valid = attr->ia_valid; | |
314 | ||
315 | if (ia_valid & ATTR_UID) | |
316 | inode->i_uid = attr->ia_uid; | |
317 | if (ia_valid & ATTR_GID) | |
318 | inode->i_gid = attr->ia_gid; | |
319 | if (ia_valid & ATTR_ATIME) | |
320 | inode->i_atime = timespec_trunc(attr->ia_atime, | |
321 | inode->i_sb->s_time_gran); | |
322 | if (ia_valid & ATTR_MTIME) | |
323 | inode->i_mtime = timespec_trunc(attr->ia_mtime, | |
324 | inode->i_sb->s_time_gran); | |
325 | if (ia_valid & ATTR_CTIME) | |
326 | inode->i_ctime = timespec_trunc(attr->ia_ctime, | |
327 | inode->i_sb->s_time_gran); | |
328 | if (ia_valid & ATTR_MODE) { | |
329 | umode_t mode = attr->ia_mode; | |
330 | ||
331 | if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) | |
332 | mode &= ~S_ISGID; | |
333 | set_acl_inode(fi, mode); | |
334 | } | |
335 | } | |
336 | #else | |
337 | #define __setattr_copy setattr_copy | |
338 | #endif | |
339 | ||
340 | int f2fs_setattr(struct dentry *dentry, struct iattr *attr) | |
341 | { | |
342 | struct inode *inode = dentry->d_inode; | |
343 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
344 | int err; | |
345 | ||
346 | err = inode_change_ok(inode, attr); | |
347 | if (err) | |
348 | return err; | |
349 | ||
350 | if ((attr->ia_valid & ATTR_SIZE) && | |
351 | attr->ia_size != i_size_read(inode)) { | |
352 | truncate_setsize(inode, attr->ia_size); | |
353 | f2fs_truncate(inode); | |
354 | } | |
355 | ||
356 | __setattr_copy(inode, attr); | |
357 | ||
358 | if (attr->ia_valid & ATTR_MODE) { | |
359 | err = f2fs_acl_chmod(inode); | |
360 | if (err || is_inode_flag_set(fi, FI_ACL_MODE)) { | |
361 | inode->i_mode = fi->i_acl_mode; | |
362 | clear_inode_flag(fi, FI_ACL_MODE); | |
363 | } | |
364 | } | |
365 | ||
366 | mark_inode_dirty(inode); | |
367 | return err; | |
368 | } | |
369 | ||
370 | const struct inode_operations f2fs_file_inode_operations = { | |
371 | .getattr = f2fs_getattr, | |
372 | .setattr = f2fs_setattr, | |
373 | .get_acl = f2fs_get_acl, | |
374 | #ifdef CONFIG_F2FS_FS_XATTR | |
375 | .setxattr = generic_setxattr, | |
376 | .getxattr = generic_getxattr, | |
377 | .listxattr = f2fs_listxattr, | |
378 | .removexattr = generic_removexattr, | |
379 | #endif | |
380 | }; | |
381 | ||
382 | static void fill_zero(struct inode *inode, pgoff_t index, | |
383 | loff_t start, loff_t len) | |
384 | { | |
385 | struct page *page; | |
386 | ||
387 | if (!len) | |
388 | return; | |
389 | ||
390 | page = get_new_data_page(inode, index, false); | |
391 | ||
392 | if (!IS_ERR(page)) { | |
393 | wait_on_page_writeback(page); | |
394 | zero_user(page, start, len); | |
395 | set_page_dirty(page); | |
396 | f2fs_put_page(page, 1); | |
397 | } | |
398 | } | |
399 | ||
400 | int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) | |
401 | { | |
402 | pgoff_t index; | |
403 | int err; | |
404 | ||
405 | for (index = pg_start; index < pg_end; index++) { | |
406 | struct dnode_of_data dn; | |
407 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
408 | ||
409 | mutex_lock_op(sbi, DATA_TRUNC); | |
410 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
411 | err = get_dnode_of_data(&dn, index, RDONLY_NODE); | |
412 | if (err) { | |
413 | mutex_unlock_op(sbi, DATA_TRUNC); | |
414 | if (err == -ENOENT) | |
415 | continue; | |
416 | return err; | |
417 | } | |
418 | ||
419 | if (dn.data_blkaddr != NULL_ADDR) | |
420 | truncate_data_blocks_range(&dn, 1); | |
421 | f2fs_put_dnode(&dn); | |
422 | mutex_unlock_op(sbi, DATA_TRUNC); | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | ||
427 | static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode) | |
428 | { | |
429 | pgoff_t pg_start, pg_end; | |
430 | loff_t off_start, off_end; | |
431 | int ret = 0; | |
432 | ||
433 | pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; | |
434 | pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; | |
435 | ||
436 | off_start = offset & (PAGE_CACHE_SIZE - 1); | |
437 | off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); | |
438 | ||
439 | if (pg_start == pg_end) { | |
440 | fill_zero(inode, pg_start, off_start, | |
441 | off_end - off_start); | |
442 | } else { | |
443 | if (off_start) | |
444 | fill_zero(inode, pg_start++, off_start, | |
445 | PAGE_CACHE_SIZE - off_start); | |
446 | if (off_end) | |
447 | fill_zero(inode, pg_end, 0, off_end); | |
448 | ||
449 | if (pg_start < pg_end) { | |
450 | struct address_space *mapping = inode->i_mapping; | |
451 | loff_t blk_start, blk_end; | |
452 | ||
453 | blk_start = pg_start << PAGE_CACHE_SHIFT; | |
454 | blk_end = pg_end << PAGE_CACHE_SHIFT; | |
455 | truncate_inode_pages_range(mapping, blk_start, | |
456 | blk_end - 1); | |
457 | ret = truncate_hole(inode, pg_start, pg_end); | |
458 | } | |
459 | } | |
460 | ||
461 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
462 | i_size_read(inode) <= (offset + len)) { | |
463 | i_size_write(inode, offset); | |
464 | mark_inode_dirty(inode); | |
465 | } | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
470 | static int expand_inode_data(struct inode *inode, loff_t offset, | |
471 | loff_t len, int mode) | |
472 | { | |
473 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
474 | pgoff_t index, pg_start, pg_end; | |
475 | loff_t new_size = i_size_read(inode); | |
476 | loff_t off_start, off_end; | |
477 | int ret = 0; | |
478 | ||
479 | ret = inode_newsize_ok(inode, (len + offset)); | |
480 | if (ret) | |
481 | return ret; | |
482 | ||
483 | pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; | |
484 | pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; | |
485 | ||
486 | off_start = offset & (PAGE_CACHE_SIZE - 1); | |
487 | off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); | |
488 | ||
489 | for (index = pg_start; index <= pg_end; index++) { | |
490 | struct dnode_of_data dn; | |
491 | ||
492 | mutex_lock_op(sbi, DATA_NEW); | |
493 | ||
494 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
495 | ret = get_dnode_of_data(&dn, index, 0); | |
496 | if (ret) { | |
497 | mutex_unlock_op(sbi, DATA_NEW); | |
498 | break; | |
499 | } | |
500 | ||
501 | if (dn.data_blkaddr == NULL_ADDR) { | |
502 | ret = reserve_new_block(&dn); | |
503 | if (ret) { | |
504 | f2fs_put_dnode(&dn); | |
505 | mutex_unlock_op(sbi, DATA_NEW); | |
506 | break; | |
507 | } | |
508 | } | |
509 | f2fs_put_dnode(&dn); | |
510 | ||
511 | mutex_unlock_op(sbi, DATA_NEW); | |
512 | ||
513 | if (pg_start == pg_end) | |
514 | new_size = offset + len; | |
515 | else if (index == pg_start && off_start) | |
516 | new_size = (index + 1) << PAGE_CACHE_SHIFT; | |
517 | else if (index == pg_end) | |
518 | new_size = (index << PAGE_CACHE_SHIFT) + off_end; | |
519 | else | |
520 | new_size += PAGE_CACHE_SIZE; | |
521 | } | |
522 | ||
523 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
524 | i_size_read(inode) < new_size) { | |
525 | i_size_write(inode, new_size); | |
526 | mark_inode_dirty(inode); | |
527 | } | |
528 | ||
529 | return ret; | |
530 | } | |
531 | ||
532 | static long f2fs_fallocate(struct file *file, int mode, | |
533 | loff_t offset, loff_t len) | |
534 | { | |
535 | struct inode *inode = file->f_path.dentry->d_inode; | |
536 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
537 | long ret; | |
538 | ||
539 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
540 | return -EOPNOTSUPP; | |
541 | ||
542 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
543 | ret = punch_hole(inode, offset, len, mode); | |
544 | else | |
545 | ret = expand_inode_data(inode, offset, len, mode); | |
546 | ||
547 | f2fs_balance_fs(sbi); | |
548 | return ret; | |
549 | } | |
550 | ||
551 | #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL)) | |
552 | #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL) | |
553 | ||
554 | static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags) | |
555 | { | |
556 | if (S_ISDIR(mode)) | |
557 | return flags; | |
558 | else if (S_ISREG(mode)) | |
559 | return flags & F2FS_REG_FLMASK; | |
560 | else | |
561 | return flags & F2FS_OTHER_FLMASK; | |
562 | } | |
563 | ||
564 | long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
565 | { | |
566 | struct inode *inode = filp->f_dentry->d_inode; | |
567 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
568 | unsigned int flags; | |
569 | int ret; | |
570 | ||
571 | switch (cmd) { | |
572 | case FS_IOC_GETFLAGS: | |
573 | flags = fi->i_flags & FS_FL_USER_VISIBLE; | |
574 | return put_user(flags, (int __user *) arg); | |
575 | case FS_IOC_SETFLAGS: | |
576 | { | |
577 | unsigned int oldflags; | |
578 | ||
579 | ret = mnt_want_write(filp->f_path.mnt); | |
580 | if (ret) | |
581 | return ret; | |
582 | ||
583 | if (!inode_owner_or_capable(inode)) { | |
584 | ret = -EACCES; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | if (get_user(flags, (int __user *) arg)) { | |
589 | ret = -EFAULT; | |
590 | goto out; | |
591 | } | |
592 | ||
593 | flags = f2fs_mask_flags(inode->i_mode, flags); | |
594 | ||
595 | mutex_lock(&inode->i_mutex); | |
596 | ||
597 | oldflags = fi->i_flags; | |
598 | ||
599 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
600 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
601 | mutex_unlock(&inode->i_mutex); | |
602 | ret = -EPERM; | |
603 | goto out; | |
604 | } | |
605 | } | |
606 | ||
607 | flags = flags & FS_FL_USER_MODIFIABLE; | |
608 | flags |= oldflags & ~FS_FL_USER_MODIFIABLE; | |
609 | fi->i_flags = flags; | |
610 | mutex_unlock(&inode->i_mutex); | |
611 | ||
612 | f2fs_set_inode_flags(inode); | |
613 | inode->i_ctime = CURRENT_TIME; | |
614 | mark_inode_dirty(inode); | |
615 | out: | |
616 | mnt_drop_write(filp->f_path.mnt); | |
617 | return ret; | |
618 | } | |
619 | default: | |
620 | return -ENOTTY; | |
621 | } | |
622 | } | |
623 | ||
624 | const struct file_operations f2fs_file_operations = { | |
625 | .llseek = generic_file_llseek, | |
626 | .read = do_sync_read, | |
627 | .write = do_sync_write, | |
628 | .aio_read = generic_file_aio_read, | |
629 | .aio_write = generic_file_aio_write, | |
630 | .open = generic_file_open, | |
631 | .mmap = f2fs_file_mmap, | |
632 | .fsync = f2fs_sync_file, | |
633 | .fallocate = f2fs_fallocate, | |
634 | .unlocked_ioctl = f2fs_ioctl, | |
635 | .splice_read = generic_file_splice_read, | |
636 | .splice_write = generic_file_splice_write, | |
637 | }; |