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Commit | Line | Data |
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0a8165d7 | 1 | /* |
fbfa2cc5 JK |
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); | |
fbfa2cc5 JK |
33 | block_t old_blk_addr; |
34 | struct dnode_of_data dn; | |
35 | int err; | |
36 | ||
37 | f2fs_balance_fs(sbi); | |
38 | ||
39 | sb_start_pagefault(inode->i_sb); | |
40 | ||
41 | mutex_lock_op(sbi, DATA_NEW); | |
42 | ||
43 | /* block allocation */ | |
44 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
45 | err = get_dnode_of_data(&dn, page->index, 0); | |
46 | if (err) { | |
47 | mutex_unlock_op(sbi, DATA_NEW); | |
48 | goto out; | |
49 | } | |
50 | ||
51 | old_blk_addr = dn.data_blkaddr; | |
fbfa2cc5 JK |
52 | |
53 | if (old_blk_addr == NULL_ADDR) { | |
54 | err = reserve_new_block(&dn); | |
55 | if (err) { | |
56 | f2fs_put_dnode(&dn); | |
57 | mutex_unlock_op(sbi, DATA_NEW); | |
58 | goto out; | |
59 | } | |
60 | } | |
61 | f2fs_put_dnode(&dn); | |
62 | ||
63 | mutex_unlock_op(sbi, DATA_NEW); | |
64 | ||
65 | lock_page(page); | |
66 | if (page->mapping != inode->i_mapping || | |
67 | page_offset(page) >= i_size_read(inode) || | |
68 | !PageUptodate(page)) { | |
69 | unlock_page(page); | |
70 | err = -EFAULT; | |
71 | goto out; | |
72 | } | |
73 | ||
74 | /* | |
75 | * check to see if the page is mapped already (no holes) | |
76 | */ | |
77 | if (PageMappedToDisk(page)) | |
78 | goto out; | |
79 | ||
80 | /* fill the page */ | |
81 | wait_on_page_writeback(page); | |
82 | ||
83 | /* page is wholly or partially inside EOF */ | |
84 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) { | |
85 | unsigned offset; | |
86 | offset = i_size_read(inode) & ~PAGE_CACHE_MASK; | |
87 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
88 | } | |
89 | set_page_dirty(page); | |
90 | SetPageUptodate(page); | |
91 | ||
92 | file_update_time(vma->vm_file); | |
93 | out: | |
94 | sb_end_pagefault(inode->i_sb); | |
95 | return block_page_mkwrite_return(err); | |
96 | } | |
97 | ||
98 | static const struct vm_operations_struct f2fs_file_vm_ops = { | |
99 | .fault = filemap_fault, | |
100 | .page_mkwrite = f2fs_vm_page_mkwrite, | |
101 | }; | |
102 | ||
103 | static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode) | |
104 | { | |
105 | struct dentry *dentry; | |
106 | nid_t pino; | |
107 | ||
108 | inode = igrab(inode); | |
109 | dentry = d_find_any_alias(inode); | |
110 | if (!dentry) { | |
111 | iput(inode); | |
112 | return 0; | |
113 | } | |
114 | pino = dentry->d_parent->d_inode->i_ino; | |
115 | dput(dentry); | |
116 | iput(inode); | |
117 | return !is_checkpointed_node(sbi, pino); | |
118 | } | |
119 | ||
120 | int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) | |
121 | { | |
122 | struct inode *inode = file->f_mapping->host; | |
123 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
124 | unsigned long long cur_version; | |
125 | int ret = 0; | |
126 | bool need_cp = false; | |
127 | struct writeback_control wbc = { | |
128 | .sync_mode = WB_SYNC_ALL, | |
129 | .nr_to_write = LONG_MAX, | |
130 | .for_reclaim = 0, | |
131 | }; | |
132 | ||
1fa95b0b NJ |
133 | if (inode->i_sb->s_flags & MS_RDONLY) |
134 | return 0; | |
135 | ||
fbfa2cc5 JK |
136 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
137 | if (ret) | |
138 | return ret; | |
139 | ||
140 | mutex_lock(&inode->i_mutex); | |
141 | ||
fbfa2cc5 JK |
142 | if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
143 | goto out; | |
144 | ||
145 | mutex_lock(&sbi->cp_mutex); | |
146 | cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver); | |
147 | mutex_unlock(&sbi->cp_mutex); | |
148 | ||
149 | if (F2FS_I(inode)->data_version != cur_version && | |
150 | !(inode->i_state & I_DIRTY)) | |
151 | goto out; | |
152 | F2FS_I(inode)->data_version--; | |
153 | ||
154 | if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1) | |
155 | need_cp = true; | |
156 | if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP)) | |
157 | need_cp = true; | |
158 | if (!space_for_roll_forward(sbi)) | |
159 | need_cp = true; | |
160 | if (need_to_sync_dir(sbi, inode)) | |
161 | need_cp = true; | |
162 | ||
fbfa2cc5 JK |
163 | if (need_cp) { |
164 | /* all the dirty node pages should be flushed for POR */ | |
165 | ret = f2fs_sync_fs(inode->i_sb, 1); | |
166 | clear_inode_flag(F2FS_I(inode), FI_NEED_CP); | |
167 | } else { | |
398b1ac5 JK |
168 | /* if there is no written node page, write its inode page */ |
169 | while (!sync_node_pages(sbi, inode->i_ino, &wbc)) { | |
170 | ret = f2fs_write_inode(inode, NULL); | |
171 | if (ret) | |
172 | goto out; | |
173 | } | |
fbfa2cc5 JK |
174 | filemap_fdatawait_range(sbi->node_inode->i_mapping, |
175 | 0, LONG_MAX); | |
176 | } | |
177 | out: | |
178 | mutex_unlock(&inode->i_mutex); | |
179 | return ret; | |
180 | } | |
181 | ||
182 | static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
183 | { | |
184 | file_accessed(file); | |
185 | vma->vm_ops = &f2fs_file_vm_ops; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int truncate_data_blocks_range(struct dnode_of_data *dn, int count) | |
190 | { | |
191 | int nr_free = 0, ofs = dn->ofs_in_node; | |
192 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
193 | struct f2fs_node *raw_node; | |
194 | __le32 *addr; | |
195 | ||
196 | raw_node = page_address(dn->node_page); | |
197 | addr = blkaddr_in_node(raw_node) + ofs; | |
198 | ||
199 | for ( ; count > 0; count--, addr++, dn->ofs_in_node++) { | |
200 | block_t blkaddr = le32_to_cpu(*addr); | |
201 | if (blkaddr == NULL_ADDR) | |
202 | continue; | |
203 | ||
204 | update_extent_cache(NULL_ADDR, dn); | |
205 | invalidate_blocks(sbi, blkaddr); | |
206 | dec_valid_block_count(sbi, dn->inode, 1); | |
207 | nr_free++; | |
208 | } | |
209 | if (nr_free) { | |
210 | set_page_dirty(dn->node_page); | |
211 | sync_inode_page(dn); | |
212 | } | |
213 | dn->ofs_in_node = ofs; | |
214 | return nr_free; | |
215 | } | |
216 | ||
217 | void truncate_data_blocks(struct dnode_of_data *dn) | |
218 | { | |
219 | truncate_data_blocks_range(dn, ADDRS_PER_BLOCK); | |
220 | } | |
221 | ||
222 | static void truncate_partial_data_page(struct inode *inode, u64 from) | |
223 | { | |
224 | unsigned offset = from & (PAGE_CACHE_SIZE - 1); | |
225 | struct page *page; | |
226 | ||
227 | if (!offset) | |
228 | return; | |
229 | ||
230 | page = find_data_page(inode, from >> PAGE_CACHE_SHIFT); | |
231 | if (IS_ERR(page)) | |
232 | return; | |
233 | ||
234 | lock_page(page); | |
235 | wait_on_page_writeback(page); | |
236 | zero_user(page, offset, PAGE_CACHE_SIZE - offset); | |
237 | set_page_dirty(page); | |
238 | f2fs_put_page(page, 1); | |
239 | } | |
240 | ||
241 | static int truncate_blocks(struct inode *inode, u64 from) | |
242 | { | |
243 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
244 | unsigned int blocksize = inode->i_sb->s_blocksize; | |
245 | struct dnode_of_data dn; | |
246 | pgoff_t free_from; | |
247 | int count = 0; | |
248 | int err; | |
249 | ||
250 | free_from = (pgoff_t) | |
251 | ((from + blocksize - 1) >> (sbi->log_blocksize)); | |
252 | ||
253 | mutex_lock_op(sbi, DATA_TRUNC); | |
254 | ||
255 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
256 | err = get_dnode_of_data(&dn, free_from, RDONLY_NODE); | |
257 | if (err) { | |
258 | if (err == -ENOENT) | |
259 | goto free_next; | |
260 | mutex_unlock_op(sbi, DATA_TRUNC); | |
261 | return err; | |
262 | } | |
263 | ||
264 | if (IS_INODE(dn.node_page)) | |
265 | count = ADDRS_PER_INODE; | |
266 | else | |
267 | count = ADDRS_PER_BLOCK; | |
268 | ||
269 | count -= dn.ofs_in_node; | |
270 | BUG_ON(count < 0); | |
271 | if (dn.ofs_in_node || IS_INODE(dn.node_page)) { | |
272 | truncate_data_blocks_range(&dn, count); | |
273 | free_from += count; | |
274 | } | |
275 | ||
276 | f2fs_put_dnode(&dn); | |
277 | free_next: | |
278 | err = truncate_inode_blocks(inode, free_from); | |
279 | mutex_unlock_op(sbi, DATA_TRUNC); | |
280 | ||
281 | /* lastly zero out the first data page */ | |
282 | truncate_partial_data_page(inode, from); | |
283 | ||
284 | return err; | |
285 | } | |
286 | ||
287 | void f2fs_truncate(struct inode *inode) | |
288 | { | |
289 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
290 | S_ISLNK(inode->i_mode))) | |
291 | return; | |
292 | ||
293 | if (!truncate_blocks(inode, i_size_read(inode))) { | |
294 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
295 | mark_inode_dirty(inode); | |
296 | } | |
297 | ||
298 | f2fs_balance_fs(F2FS_SB(inode->i_sb)); | |
299 | } | |
300 | ||
301 | static int f2fs_getattr(struct vfsmount *mnt, | |
302 | struct dentry *dentry, struct kstat *stat) | |
303 | { | |
304 | struct inode *inode = dentry->d_inode; | |
305 | generic_fillattr(inode, stat); | |
306 | stat->blocks <<= 3; | |
307 | return 0; | |
308 | } | |
309 | ||
310 | #ifdef CONFIG_F2FS_FS_POSIX_ACL | |
311 | static void __setattr_copy(struct inode *inode, const struct iattr *attr) | |
312 | { | |
313 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
314 | unsigned int ia_valid = attr->ia_valid; | |
315 | ||
316 | if (ia_valid & ATTR_UID) | |
317 | inode->i_uid = attr->ia_uid; | |
318 | if (ia_valid & ATTR_GID) | |
319 | inode->i_gid = attr->ia_gid; | |
320 | if (ia_valid & ATTR_ATIME) | |
321 | inode->i_atime = timespec_trunc(attr->ia_atime, | |
322 | inode->i_sb->s_time_gran); | |
323 | if (ia_valid & ATTR_MTIME) | |
324 | inode->i_mtime = timespec_trunc(attr->ia_mtime, | |
325 | inode->i_sb->s_time_gran); | |
326 | if (ia_valid & ATTR_CTIME) | |
327 | inode->i_ctime = timespec_trunc(attr->ia_ctime, | |
328 | inode->i_sb->s_time_gran); | |
329 | if (ia_valid & ATTR_MODE) { | |
330 | umode_t mode = attr->ia_mode; | |
331 | ||
332 | if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) | |
333 | mode &= ~S_ISGID; | |
334 | set_acl_inode(fi, mode); | |
335 | } | |
336 | } | |
337 | #else | |
338 | #define __setattr_copy setattr_copy | |
339 | #endif | |
340 | ||
341 | int f2fs_setattr(struct dentry *dentry, struct iattr *attr) | |
342 | { | |
343 | struct inode *inode = dentry->d_inode; | |
344 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
345 | int err; | |
346 | ||
347 | err = inode_change_ok(inode, attr); | |
348 | if (err) | |
349 | return err; | |
350 | ||
351 | if ((attr->ia_valid & ATTR_SIZE) && | |
352 | attr->ia_size != i_size_read(inode)) { | |
353 | truncate_setsize(inode, attr->ia_size); | |
354 | f2fs_truncate(inode); | |
355 | } | |
356 | ||
357 | __setattr_copy(inode, attr); | |
358 | ||
359 | if (attr->ia_valid & ATTR_MODE) { | |
360 | err = f2fs_acl_chmod(inode); | |
361 | if (err || is_inode_flag_set(fi, FI_ACL_MODE)) { | |
362 | inode->i_mode = fi->i_acl_mode; | |
363 | clear_inode_flag(fi, FI_ACL_MODE); | |
364 | } | |
365 | } | |
366 | ||
367 | mark_inode_dirty(inode); | |
368 | return err; | |
369 | } | |
370 | ||
371 | const struct inode_operations f2fs_file_inode_operations = { | |
372 | .getattr = f2fs_getattr, | |
373 | .setattr = f2fs_setattr, | |
374 | .get_acl = f2fs_get_acl, | |
375 | #ifdef CONFIG_F2FS_FS_XATTR | |
376 | .setxattr = generic_setxattr, | |
377 | .getxattr = generic_getxattr, | |
378 | .listxattr = f2fs_listxattr, | |
379 | .removexattr = generic_removexattr, | |
380 | #endif | |
381 | }; | |
382 | ||
383 | static void fill_zero(struct inode *inode, pgoff_t index, | |
384 | loff_t start, loff_t len) | |
385 | { | |
386 | struct page *page; | |
387 | ||
388 | if (!len) | |
389 | return; | |
390 | ||
391 | page = get_new_data_page(inode, index, false); | |
392 | ||
393 | if (!IS_ERR(page)) { | |
394 | wait_on_page_writeback(page); | |
395 | zero_user(page, start, len); | |
396 | set_page_dirty(page); | |
397 | f2fs_put_page(page, 1); | |
398 | } | |
399 | } | |
400 | ||
401 | int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) | |
402 | { | |
403 | pgoff_t index; | |
404 | int err; | |
405 | ||
406 | for (index = pg_start; index < pg_end; index++) { | |
407 | struct dnode_of_data dn; | |
408 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
409 | ||
410 | mutex_lock_op(sbi, DATA_TRUNC); | |
411 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
412 | err = get_dnode_of_data(&dn, index, RDONLY_NODE); | |
413 | if (err) { | |
414 | mutex_unlock_op(sbi, DATA_TRUNC); | |
415 | if (err == -ENOENT) | |
416 | continue; | |
417 | return err; | |
418 | } | |
419 | ||
420 | if (dn.data_blkaddr != NULL_ADDR) | |
421 | truncate_data_blocks_range(&dn, 1); | |
422 | f2fs_put_dnode(&dn); | |
423 | mutex_unlock_op(sbi, DATA_TRUNC); | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode) | |
429 | { | |
430 | pgoff_t pg_start, pg_end; | |
431 | loff_t off_start, off_end; | |
432 | int ret = 0; | |
433 | ||
434 | pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; | |
435 | pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; | |
436 | ||
437 | off_start = offset & (PAGE_CACHE_SIZE - 1); | |
438 | off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); | |
439 | ||
440 | if (pg_start == pg_end) { | |
441 | fill_zero(inode, pg_start, off_start, | |
442 | off_end - off_start); | |
443 | } else { | |
444 | if (off_start) | |
445 | fill_zero(inode, pg_start++, off_start, | |
446 | PAGE_CACHE_SIZE - off_start); | |
447 | if (off_end) | |
448 | fill_zero(inode, pg_end, 0, off_end); | |
449 | ||
450 | if (pg_start < pg_end) { | |
451 | struct address_space *mapping = inode->i_mapping; | |
452 | loff_t blk_start, blk_end; | |
453 | ||
454 | blk_start = pg_start << PAGE_CACHE_SHIFT; | |
455 | blk_end = pg_end << PAGE_CACHE_SHIFT; | |
456 | truncate_inode_pages_range(mapping, blk_start, | |
457 | blk_end - 1); | |
458 | ret = truncate_hole(inode, pg_start, pg_end); | |
459 | } | |
460 | } | |
461 | ||
462 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
463 | i_size_read(inode) <= (offset + len)) { | |
464 | i_size_write(inode, offset); | |
465 | mark_inode_dirty(inode); | |
466 | } | |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
471 | static int expand_inode_data(struct inode *inode, loff_t offset, | |
472 | loff_t len, int mode) | |
473 | { | |
474 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
475 | pgoff_t index, pg_start, pg_end; | |
476 | loff_t new_size = i_size_read(inode); | |
477 | loff_t off_start, off_end; | |
478 | int ret = 0; | |
479 | ||
480 | ret = inode_newsize_ok(inode, (len + offset)); | |
481 | if (ret) | |
482 | return ret; | |
483 | ||
484 | pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; | |
485 | pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; | |
486 | ||
487 | off_start = offset & (PAGE_CACHE_SIZE - 1); | |
488 | off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); | |
489 | ||
490 | for (index = pg_start; index <= pg_end; index++) { | |
491 | struct dnode_of_data dn; | |
492 | ||
493 | mutex_lock_op(sbi, DATA_NEW); | |
494 | ||
495 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
496 | ret = get_dnode_of_data(&dn, index, 0); | |
497 | if (ret) { | |
498 | mutex_unlock_op(sbi, DATA_NEW); | |
499 | break; | |
500 | } | |
501 | ||
502 | if (dn.data_blkaddr == NULL_ADDR) { | |
503 | ret = reserve_new_block(&dn); | |
504 | if (ret) { | |
505 | f2fs_put_dnode(&dn); | |
506 | mutex_unlock_op(sbi, DATA_NEW); | |
507 | break; | |
508 | } | |
509 | } | |
510 | f2fs_put_dnode(&dn); | |
511 | ||
512 | mutex_unlock_op(sbi, DATA_NEW); | |
513 | ||
514 | if (pg_start == pg_end) | |
515 | new_size = offset + len; | |
516 | else if (index == pg_start && off_start) | |
517 | new_size = (index + 1) << PAGE_CACHE_SHIFT; | |
518 | else if (index == pg_end) | |
519 | new_size = (index << PAGE_CACHE_SHIFT) + off_end; | |
520 | else | |
521 | new_size += PAGE_CACHE_SIZE; | |
522 | } | |
523 | ||
524 | if (!(mode & FALLOC_FL_KEEP_SIZE) && | |
525 | i_size_read(inode) < new_size) { | |
526 | i_size_write(inode, new_size); | |
527 | mark_inode_dirty(inode); | |
528 | } | |
529 | ||
530 | return ret; | |
531 | } | |
532 | ||
533 | static long f2fs_fallocate(struct file *file, int mode, | |
534 | loff_t offset, loff_t len) | |
535 | { | |
536 | struct inode *inode = file->f_path.dentry->d_inode; | |
537 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
538 | long ret; | |
539 | ||
540 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
541 | return -EOPNOTSUPP; | |
542 | ||
543 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
544 | ret = punch_hole(inode, offset, len, mode); | |
545 | else | |
546 | ret = expand_inode_data(inode, offset, len, mode); | |
547 | ||
548 | f2fs_balance_fs(sbi); | |
549 | return ret; | |
550 | } | |
551 | ||
552 | #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL)) | |
553 | #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL) | |
554 | ||
555 | static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags) | |
556 | { | |
557 | if (S_ISDIR(mode)) | |
558 | return flags; | |
559 | else if (S_ISREG(mode)) | |
560 | return flags & F2FS_REG_FLMASK; | |
561 | else | |
562 | return flags & F2FS_OTHER_FLMASK; | |
563 | } | |
564 | ||
565 | long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
566 | { | |
567 | struct inode *inode = filp->f_dentry->d_inode; | |
568 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
569 | unsigned int flags; | |
570 | int ret; | |
571 | ||
572 | switch (cmd) { | |
573 | case FS_IOC_GETFLAGS: | |
574 | flags = fi->i_flags & FS_FL_USER_VISIBLE; | |
575 | return put_user(flags, (int __user *) arg); | |
576 | case FS_IOC_SETFLAGS: | |
577 | { | |
578 | unsigned int oldflags; | |
579 | ||
580 | ret = mnt_want_write(filp->f_path.mnt); | |
581 | if (ret) | |
582 | return ret; | |
583 | ||
584 | if (!inode_owner_or_capable(inode)) { | |
585 | ret = -EACCES; | |
586 | goto out; | |
587 | } | |
588 | ||
589 | if (get_user(flags, (int __user *) arg)) { | |
590 | ret = -EFAULT; | |
591 | goto out; | |
592 | } | |
593 | ||
594 | flags = f2fs_mask_flags(inode->i_mode, flags); | |
595 | ||
596 | mutex_lock(&inode->i_mutex); | |
597 | ||
598 | oldflags = fi->i_flags; | |
599 | ||
600 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
601 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
602 | mutex_unlock(&inode->i_mutex); | |
603 | ret = -EPERM; | |
604 | goto out; | |
605 | } | |
606 | } | |
607 | ||
608 | flags = flags & FS_FL_USER_MODIFIABLE; | |
609 | flags |= oldflags & ~FS_FL_USER_MODIFIABLE; | |
610 | fi->i_flags = flags; | |
611 | mutex_unlock(&inode->i_mutex); | |
612 | ||
613 | f2fs_set_inode_flags(inode); | |
614 | inode->i_ctime = CURRENT_TIME; | |
615 | mark_inode_dirty(inode); | |
616 | out: | |
617 | mnt_drop_write(filp->f_path.mnt); | |
618 | return ret; | |
619 | } | |
620 | default: | |
621 | return -ENOTTY; | |
622 | } | |
623 | } | |
624 | ||
625 | const struct file_operations f2fs_file_operations = { | |
626 | .llseek = generic_file_llseek, | |
627 | .read = do_sync_read, | |
628 | .write = do_sync_write, | |
629 | .aio_read = generic_file_aio_read, | |
630 | .aio_write = generic_file_aio_write, | |
631 | .open = generic_file_open, | |
632 | .mmap = f2fs_file_mmap, | |
633 | .fsync = f2fs_sync_file, | |
634 | .fallocate = f2fs_fallocate, | |
635 | .unlocked_ioctl = f2fs_ioctl, | |
636 | .splice_read = generic_file_splice_read, | |
637 | .splice_write = generic_file_splice_write, | |
638 | }; |