1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * fs/f2fs/namei.c
4  *
5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6  *             http://www.samsung.com/
7  */
8 #include <linux/fs.h>
9 #include <linux/f2fs_fs.h>
10 #include <linux/pagemap.h>
11 #include <linux/sched.h>
12 #include <linux/ctype.h>
13 #include <linux/random.h>
14 #include <linux/dcache.h>
15 #include <linux/namei.h>
16 #include <linux/quotaops.h>
17 
18 #include "f2fs.h"
19 #include "node.h"
20 #include "segment.h"
21 #include "xattr.h"
22 #include "acl.h"
23 #include <trace/events/f2fs.h>
24 
is_extension_exist(const unsigned char * s,const char * sub,bool tmp_ext,bool tmp_dot)25 static inline bool is_extension_exist(const unsigned char *s, const char *sub,
26 						bool tmp_ext, bool tmp_dot)
27 {
28 	size_t slen = strlen(s);
29 	size_t sublen = strlen(sub);
30 	int i;
31 
32 	if (sublen == 1 && *sub == '*')
33 		return true;
34 
35 	/*
36 	 * filename format of multimedia file should be defined as:
37 	 * "filename + '.' + extension + (optional: '.' + temp extension)".
38 	 */
39 	if (slen < sublen + 2)
40 		return false;
41 
42 	if (!tmp_ext) {
43 		/* file has no temp extension */
44 		if (s[slen - sublen - 1] != '.')
45 			return false;
46 		return !strncasecmp(s + slen - sublen, sub, sublen);
47 	}
48 
49 	for (i = 1; i < slen - sublen; i++) {
50 		if (s[i] != '.')
51 			continue;
52 		if (!strncasecmp(s + i + 1, sub, sublen)) {
53 			if (!tmp_dot)
54 				return true;
55 			if (i == slen - sublen - 1 || s[i + 1 + sublen] == '.')
56 				return true;
57 		}
58 	}
59 
60 	return false;
61 }
62 
is_temperature_extension(const unsigned char * s,const char * sub)63 static inline bool is_temperature_extension(const unsigned char *s, const char *sub)
64 {
65 	return is_extension_exist(s, sub, true, false);
66 }
67 
is_compress_extension(const unsigned char * s,const char * sub)68 static inline bool is_compress_extension(const unsigned char *s, const char *sub)
69 {
70 	return is_extension_exist(s, sub, true, true);
71 }
72 
f2fs_update_extension_list(struct f2fs_sb_info * sbi,const char * name,bool hot,bool set)73 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
74 							bool hot, bool set)
75 {
76 	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
77 	int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
78 	int hot_count = sbi->raw_super->hot_ext_count;
79 	int total_count = cold_count + hot_count;
80 	int start, count;
81 	int i;
82 
83 	if (set) {
84 		if (total_count == F2FS_MAX_EXTENSION)
85 			return -EINVAL;
86 	} else {
87 		if (!hot && !cold_count)
88 			return -EINVAL;
89 		if (hot && !hot_count)
90 			return -EINVAL;
91 	}
92 
93 	if (hot) {
94 		start = cold_count;
95 		count = total_count;
96 	} else {
97 		start = 0;
98 		count = cold_count;
99 	}
100 
101 	for (i = start; i < count; i++) {
102 		if (strcmp(name, extlist[i]))
103 			continue;
104 
105 		if (set)
106 			return -EINVAL;
107 
108 		memcpy(extlist[i], extlist[i + 1],
109 				F2FS_EXTENSION_LEN * (total_count - i - 1));
110 		memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
111 		if (hot)
112 			sbi->raw_super->hot_ext_count = hot_count - 1;
113 		else
114 			sbi->raw_super->extension_count =
115 						cpu_to_le32(cold_count - 1);
116 		return 0;
117 	}
118 
119 	if (!set)
120 		return -EINVAL;
121 
122 	if (hot) {
123 		memcpy(extlist[count], name, strlen(name));
124 		sbi->raw_super->hot_ext_count = hot_count + 1;
125 	} else {
126 		char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
127 
128 		memcpy(buf, &extlist[cold_count],
129 				F2FS_EXTENSION_LEN * hot_count);
130 		memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
131 		memcpy(extlist[cold_count], name, strlen(name));
132 		memcpy(&extlist[cold_count + 1], buf,
133 				F2FS_EXTENSION_LEN * hot_count);
134 		sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
135 	}
136 	return 0;
137 }
138 
set_compress_new_inode(struct f2fs_sb_info * sbi,struct inode * dir,struct inode * inode,const unsigned char * name)139 static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
140 				struct inode *inode, const unsigned char *name)
141 {
142 	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
143 	unsigned char (*noext)[F2FS_EXTENSION_LEN] =
144 						F2FS_OPTION(sbi).noextensions;
145 	unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions;
146 	unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
147 	unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
148 	int i, cold_count, hot_count;
149 
150 	if (!f2fs_sb_has_compression(sbi))
151 		return;
152 
153 	if (S_ISDIR(inode->i_mode))
154 		goto inherit_comp;
155 
156 	/* This name comes only from normal files. */
157 	if (!name)
158 		return;
159 
160 	/* Don't compress hot files. */
161 	f2fs_down_read(&sbi->sb_lock);
162 	cold_count = le32_to_cpu(sbi->raw_super->extension_count);
163 	hot_count = sbi->raw_super->hot_ext_count;
164 	for (i = cold_count; i < cold_count + hot_count; i++)
165 		if (is_temperature_extension(name, extlist[i]))
166 			break;
167 	f2fs_up_read(&sbi->sb_lock);
168 	if (i < (cold_count + hot_count))
169 		return;
170 
171 	/* Don't compress unallowed extension. */
172 	for (i = 0; i < noext_cnt; i++)
173 		if (is_compress_extension(name, noext[i]))
174 			return;
175 
176 	/* Compress wanting extension. */
177 	for (i = 0; i < ext_cnt; i++) {
178 		if (is_compress_extension(name, ext[i])) {
179 			set_compress_context(inode);
180 			return;
181 		}
182 	}
183 inherit_comp:
184 	/* Inherit the {no-}compression flag in directory */
185 	if (F2FS_I(dir)->i_flags & F2FS_NOCOMP_FL) {
186 		F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL;
187 		f2fs_mark_inode_dirty_sync(inode, true);
188 	} else if (F2FS_I(dir)->i_flags & F2FS_COMPR_FL) {
189 		set_compress_context(inode);
190 	}
191 }
192 
193 /*
194  * Set file's temperature for hot/cold data separation
195  */
set_file_temperature(struct f2fs_sb_info * sbi,struct inode * inode,const unsigned char * name)196 static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
197 		const unsigned char *name)
198 {
199 	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
200 	int i, cold_count, hot_count;
201 
202 	f2fs_down_read(&sbi->sb_lock);
203 	cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204 	hot_count = sbi->raw_super->hot_ext_count;
205 	for (i = 0; i < cold_count + hot_count; i++)
206 		if (is_temperature_extension(name, extlist[i]))
207 			break;
208 	f2fs_up_read(&sbi->sb_lock);
209 
210 	if (i == cold_count + hot_count)
211 		return;
212 
213 	if (i < cold_count)
214 		file_set_cold(inode);
215 	else
216 		file_set_hot(inode);
217 }
218 
f2fs_new_inode(struct mnt_idmap * idmap,struct inode * dir,umode_t mode,const char * name)219 static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
220 						struct inode *dir, umode_t mode,
221 						const char *name)
222 {
223 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
224 	struct f2fs_inode_info *fi;
225 	nid_t ino;
226 	struct inode *inode;
227 	bool nid_free = false;
228 	bool encrypt = false;
229 	int xattr_size = 0;
230 	int err;
231 
232 	inode = new_inode(dir->i_sb);
233 	if (!inode)
234 		return ERR_PTR(-ENOMEM);
235 
236 	if (!f2fs_alloc_nid(sbi, &ino)) {
237 		err = -ENOSPC;
238 		goto fail;
239 	}
240 
241 	nid_free = true;
242 
243 	inode_init_owner(idmap, inode, dir, mode);
244 
245 	fi = F2FS_I(inode);
246 	inode->i_ino = ino;
247 	inode->i_blocks = 0;
248 	simple_inode_init_ts(inode);
249 	fi->i_crtime = inode_get_mtime(inode);
250 	inode->i_generation = get_random_u32();
251 
252 	if (S_ISDIR(inode->i_mode))
253 		fi->i_current_depth = 1;
254 
255 	err = insert_inode_locked(inode);
256 	if (err) {
257 		err = -EINVAL;
258 		goto fail;
259 	}
260 
261 	if (f2fs_sb_has_project_quota(sbi) &&
262 		(F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
263 		fi->i_projid = F2FS_I(dir)->i_projid;
264 	else
265 		fi->i_projid = make_kprojid(&init_user_ns,
266 							F2FS_DEF_PROJID);
267 
268 	err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
269 	if (err)
270 		goto fail_drop;
271 
272 	err = f2fs_dquot_initialize(inode);
273 	if (err)
274 		goto fail_drop;
275 
276 	set_inode_flag(inode, FI_NEW_INODE);
277 
278 	if (encrypt)
279 		f2fs_set_encrypted_inode(inode);
280 
281 	if (f2fs_sb_has_extra_attr(sbi)) {
282 		set_inode_flag(inode, FI_EXTRA_ATTR);
283 		fi->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
284 	}
285 
286 	if (test_opt(sbi, INLINE_XATTR))
287 		set_inode_flag(inode, FI_INLINE_XATTR);
288 
289 	if (f2fs_may_inline_dentry(inode))
290 		set_inode_flag(inode, FI_INLINE_DENTRY);
291 
292 	if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
293 		f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
294 		if (f2fs_has_inline_xattr(inode))
295 			xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
296 		/* Otherwise, will be 0 */
297 	} else if (f2fs_has_inline_xattr(inode) ||
298 				f2fs_has_inline_dentry(inode)) {
299 		xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
300 	}
301 	fi->i_inline_xattr_size = xattr_size;
302 
303 	fi->i_flags =
304 		f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
305 
306 	if (S_ISDIR(inode->i_mode))
307 		fi->i_flags |= F2FS_INDEX_FL;
308 
309 	if (fi->i_flags & F2FS_PROJINHERIT_FL)
310 		set_inode_flag(inode, FI_PROJ_INHERIT);
311 
312 	/* Check compression first. */
313 	set_compress_new_inode(sbi, dir, inode, name);
314 
315 	/* Should enable inline_data after compression set */
316 	if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
317 		set_inode_flag(inode, FI_INLINE_DATA);
318 
319 	if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY))
320 		set_file_temperature(sbi, inode, name);
321 
322 	stat_inc_inline_xattr(inode);
323 	stat_inc_inline_inode(inode);
324 	stat_inc_inline_dir(inode);
325 
326 	f2fs_set_inode_flags(inode);
327 
328 	f2fs_init_extent_tree(inode);
329 
330 	trace_f2fs_new_inode(inode, 0);
331 	return inode;
332 
333 fail:
334 	trace_f2fs_new_inode(inode, err);
335 	make_bad_inode(inode);
336 	if (nid_free)
337 		set_inode_flag(inode, FI_FREE_NID);
338 	iput(inode);
339 	return ERR_PTR(err);
340 fail_drop:
341 	trace_f2fs_new_inode(inode, err);
342 	dquot_drop(inode);
343 	inode->i_flags |= S_NOQUOTA;
344 	if (nid_free)
345 		set_inode_flag(inode, FI_FREE_NID);
346 	clear_nlink(inode);
347 	unlock_new_inode(inode);
348 	iput(inode);
349 	return ERR_PTR(err);
350 }
351 
f2fs_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)352 static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
353 		       struct dentry *dentry, umode_t mode, bool excl)
354 {
355 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
356 	struct inode *inode;
357 	nid_t ino = 0;
358 	int err;
359 
360 	if (unlikely(f2fs_cp_error(sbi)))
361 		return -EIO;
362 	if (!f2fs_is_checkpoint_ready(sbi))
363 		return -ENOSPC;
364 
365 	err = f2fs_dquot_initialize(dir);
366 	if (err)
367 		return err;
368 
369 	inode = f2fs_new_inode(idmap, dir, mode, dentry->d_name.name);
370 	if (IS_ERR(inode))
371 		return PTR_ERR(inode);
372 
373 	inode->i_op = &f2fs_file_inode_operations;
374 	inode->i_fop = &f2fs_file_operations;
375 	inode->i_mapping->a_ops = &f2fs_dblock_aops;
376 	ino = inode->i_ino;
377 
378 	f2fs_lock_op(sbi);
379 	err = f2fs_add_link(dentry, inode);
380 	if (err)
381 		goto out;
382 	f2fs_unlock_op(sbi);
383 
384 	f2fs_alloc_nid_done(sbi, ino);
385 
386 	d_instantiate_new(dentry, inode);
387 
388 	if (IS_DIRSYNC(dir))
389 		f2fs_sync_fs(sbi->sb, 1);
390 
391 	f2fs_balance_fs(sbi, true);
392 	return 0;
393 out:
394 	f2fs_handle_failed_inode(inode);
395 	return err;
396 }
397 
f2fs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)398 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
399 		struct dentry *dentry)
400 {
401 	struct inode *inode = d_inode(old_dentry);
402 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
403 	int err;
404 
405 	if (unlikely(f2fs_cp_error(sbi)))
406 		return -EIO;
407 	if (!f2fs_is_checkpoint_ready(sbi))
408 		return -ENOSPC;
409 
410 	err = fscrypt_prepare_link(old_dentry, dir, dentry);
411 	if (err)
412 		return err;
413 
414 	if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
415 			(!projid_eq(F2FS_I(dir)->i_projid,
416 			F2FS_I(old_dentry->d_inode)->i_projid)))
417 		return -EXDEV;
418 
419 	err = f2fs_dquot_initialize(dir);
420 	if (err)
421 		return err;
422 
423 	f2fs_balance_fs(sbi, true);
424 
425 	inode_set_ctime_current(inode);
426 	ihold(inode);
427 
428 	set_inode_flag(inode, FI_INC_LINK);
429 	f2fs_lock_op(sbi);
430 	err = f2fs_add_link(dentry, inode);
431 	if (err)
432 		goto out;
433 	f2fs_unlock_op(sbi);
434 
435 	d_instantiate(dentry, inode);
436 
437 	if (IS_DIRSYNC(dir))
438 		f2fs_sync_fs(sbi->sb, 1);
439 	return 0;
440 out:
441 	clear_inode_flag(inode, FI_INC_LINK);
442 	iput(inode);
443 	f2fs_unlock_op(sbi);
444 	return err;
445 }
446 
f2fs_get_parent(struct dentry * child)447 struct dentry *f2fs_get_parent(struct dentry *child)
448 {
449 	struct page *page;
450 	unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page);
451 
452 	if (!ino) {
453 		if (IS_ERR(page))
454 			return ERR_CAST(page);
455 		return ERR_PTR(-ENOENT);
456 	}
457 	return d_obtain_alias(f2fs_iget(child->d_sb, ino));
458 }
459 
f2fs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)460 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
461 		unsigned int flags)
462 {
463 	struct inode *inode = NULL;
464 	struct f2fs_dir_entry *de;
465 	struct page *page;
466 	struct dentry *new;
467 	nid_t ino = -1;
468 	int err = 0;
469 	struct f2fs_filename fname;
470 
471 	trace_f2fs_lookup_start(dir, dentry, flags);
472 
473 	if (dentry->d_name.len > F2FS_NAME_LEN) {
474 		err = -ENAMETOOLONG;
475 		goto out;
476 	}
477 
478 	err = f2fs_prepare_lookup(dir, dentry, &fname);
479 	if (err == -ENOENT)
480 		goto out_splice;
481 	if (err)
482 		goto out;
483 	de = __f2fs_find_entry(dir, &fname, &page);
484 	f2fs_free_filename(&fname);
485 
486 	if (!de) {
487 		if (IS_ERR(page)) {
488 			err = PTR_ERR(page);
489 			goto out;
490 		}
491 		err = -ENOENT;
492 		goto out_splice;
493 	}
494 
495 	ino = le32_to_cpu(de->ino);
496 	f2fs_put_page(page, 0);
497 
498 	inode = f2fs_iget(dir->i_sb, ino);
499 	if (IS_ERR(inode)) {
500 		err = PTR_ERR(inode);
501 		goto out;
502 	}
503 
504 	if (IS_ENCRYPTED(dir) &&
505 	    (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
506 	    !fscrypt_has_permitted_context(dir, inode)) {
507 		f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
508 			  dir->i_ino, inode->i_ino);
509 		err = -EPERM;
510 		goto out_iput;
511 	}
512 out_splice:
513 	if (IS_ENABLED(CONFIG_UNICODE) && !inode && IS_CASEFOLDED(dir)) {
514 		/* Eventually we want to call d_add_ci(dentry, NULL)
515 		 * for negative dentries in the encoding case as
516 		 * well.  For now, prevent the negative dentry
517 		 * from being cached.
518 		 */
519 		trace_f2fs_lookup_end(dir, dentry, ino, err);
520 		return NULL;
521 	}
522 
523 	new = d_splice_alias(inode, dentry);
524 	trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry,
525 				ino, IS_ERR(new) ? PTR_ERR(new) : err);
526 	return new;
527 out_iput:
528 	iput(inode);
529 out:
530 	trace_f2fs_lookup_end(dir, dentry, ino, err);
531 	return ERR_PTR(err);
532 }
533 
f2fs_unlink(struct inode * dir,struct dentry * dentry)534 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
535 {
536 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
537 	struct inode *inode = d_inode(dentry);
538 	struct f2fs_dir_entry *de;
539 	struct page *page;
540 	int err;
541 
542 	trace_f2fs_unlink_enter(dir, dentry);
543 
544 	if (unlikely(f2fs_cp_error(sbi))) {
545 		err = -EIO;
546 		goto fail;
547 	}
548 
549 	err = f2fs_dquot_initialize(dir);
550 	if (err)
551 		goto fail;
552 	err = f2fs_dquot_initialize(inode);
553 	if (err)
554 		goto fail;
555 
556 	de = f2fs_find_entry(dir, &dentry->d_name, &page);
557 	if (!de) {
558 		if (IS_ERR(page))
559 			err = PTR_ERR(page);
560 		goto fail;
561 	}
562 
563 	f2fs_balance_fs(sbi, true);
564 
565 	f2fs_lock_op(sbi);
566 	err = f2fs_acquire_orphan_inode(sbi);
567 	if (err) {
568 		f2fs_unlock_op(sbi);
569 		f2fs_put_page(page, 0);
570 		goto fail;
571 	}
572 	f2fs_delete_entry(de, page, dir, inode);
573 	f2fs_unlock_op(sbi);
574 
575 	/* VFS negative dentries are incompatible with Encoding and
576 	 * Case-insensitiveness. Eventually we'll want avoid
577 	 * invalidating the dentries here, alongside with returning the
578 	 * negative dentries at f2fs_lookup(), when it is better
579 	 * supported by the VFS for the CI case.
580 	 */
581 	if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
582 		d_invalidate(dentry);
583 
584 	if (IS_DIRSYNC(dir))
585 		f2fs_sync_fs(sbi->sb, 1);
586 fail:
587 	trace_f2fs_unlink_exit(inode, err);
588 	return err;
589 }
590 
f2fs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)591 static const char *f2fs_get_link(struct dentry *dentry,
592 				 struct inode *inode,
593 				 struct delayed_call *done)
594 {
595 	const char *link = page_get_link(dentry, inode, done);
596 
597 	if (!IS_ERR(link) && !*link) {
598 		/* this is broken symlink case */
599 		do_delayed_call(done);
600 		clear_delayed_call(done);
601 		link = ERR_PTR(-ENOENT);
602 	}
603 	return link;
604 }
605 
f2fs_symlink(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)606 static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
607 			struct dentry *dentry, const char *symname)
608 {
609 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
610 	struct inode *inode;
611 	size_t len = strlen(symname);
612 	struct fscrypt_str disk_link;
613 	int err;
614 
615 	if (unlikely(f2fs_cp_error(sbi)))
616 		return -EIO;
617 	if (!f2fs_is_checkpoint_ready(sbi))
618 		return -ENOSPC;
619 
620 	err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
621 				      &disk_link);
622 	if (err)
623 		return err;
624 
625 	err = f2fs_dquot_initialize(dir);
626 	if (err)
627 		return err;
628 
629 	inode = f2fs_new_inode(idmap, dir, S_IFLNK | S_IRWXUGO, NULL);
630 	if (IS_ERR(inode))
631 		return PTR_ERR(inode);
632 
633 	if (IS_ENCRYPTED(inode))
634 		inode->i_op = &f2fs_encrypted_symlink_inode_operations;
635 	else
636 		inode->i_op = &f2fs_symlink_inode_operations;
637 	inode_nohighmem(inode);
638 	inode->i_mapping->a_ops = &f2fs_dblock_aops;
639 
640 	f2fs_lock_op(sbi);
641 	err = f2fs_add_link(dentry, inode);
642 	if (err)
643 		goto out_f2fs_handle_failed_inode;
644 	f2fs_unlock_op(sbi);
645 	f2fs_alloc_nid_done(sbi, inode->i_ino);
646 
647 	err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
648 	if (err)
649 		goto err_out;
650 
651 	err = page_symlink(inode, disk_link.name, disk_link.len);
652 
653 err_out:
654 	d_instantiate_new(dentry, inode);
655 
656 	/*
657 	 * Let's flush symlink data in order to avoid broken symlink as much as
658 	 * possible. Nevertheless, fsyncing is the best way, but there is no
659 	 * way to get a file descriptor in order to flush that.
660 	 *
661 	 * Note that, it needs to do dir->fsync to make this recoverable.
662 	 * If the symlink path is stored into inline_data, there is no
663 	 * performance regression.
664 	 */
665 	if (!err) {
666 		filemap_write_and_wait_range(inode->i_mapping, 0,
667 							disk_link.len - 1);
668 
669 		if (IS_DIRSYNC(dir))
670 			f2fs_sync_fs(sbi->sb, 1);
671 	} else {
672 		f2fs_unlink(dir, dentry);
673 	}
674 
675 	f2fs_balance_fs(sbi, true);
676 	goto out_free_encrypted_link;
677 
678 out_f2fs_handle_failed_inode:
679 	f2fs_handle_failed_inode(inode);
680 out_free_encrypted_link:
681 	if (disk_link.name != (unsigned char *)symname)
682 		kfree(disk_link.name);
683 	return err;
684 }
685 
f2fs_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)686 static int f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
687 		      struct dentry *dentry, umode_t mode)
688 {
689 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
690 	struct inode *inode;
691 	int err;
692 
693 	if (unlikely(f2fs_cp_error(sbi)))
694 		return -EIO;
695 
696 	err = f2fs_dquot_initialize(dir);
697 	if (err)
698 		return err;
699 
700 	inode = f2fs_new_inode(idmap, dir, S_IFDIR | mode, NULL);
701 	if (IS_ERR(inode))
702 		return PTR_ERR(inode);
703 
704 	inode->i_op = &f2fs_dir_inode_operations;
705 	inode->i_fop = &f2fs_dir_operations;
706 	inode->i_mapping->a_ops = &f2fs_dblock_aops;
707 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
708 
709 	set_inode_flag(inode, FI_INC_LINK);
710 	f2fs_lock_op(sbi);
711 	err = f2fs_add_link(dentry, inode);
712 	if (err)
713 		goto out_fail;
714 	f2fs_unlock_op(sbi);
715 
716 	f2fs_alloc_nid_done(sbi, inode->i_ino);
717 
718 	d_instantiate_new(dentry, inode);
719 
720 	if (IS_DIRSYNC(dir))
721 		f2fs_sync_fs(sbi->sb, 1);
722 
723 	f2fs_balance_fs(sbi, true);
724 	return 0;
725 
726 out_fail:
727 	clear_inode_flag(inode, FI_INC_LINK);
728 	f2fs_handle_failed_inode(inode);
729 	return err;
730 }
731 
f2fs_rmdir(struct inode * dir,struct dentry * dentry)732 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
733 {
734 	struct inode *inode = d_inode(dentry);
735 
736 	if (f2fs_empty_dir(inode))
737 		return f2fs_unlink(dir, dentry);
738 	return -ENOTEMPTY;
739 }
740 
f2fs_mknod(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)741 static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
742 		      struct dentry *dentry, umode_t mode, dev_t rdev)
743 {
744 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
745 	struct inode *inode;
746 	int err = 0;
747 
748 	if (unlikely(f2fs_cp_error(sbi)))
749 		return -EIO;
750 	if (!f2fs_is_checkpoint_ready(sbi))
751 		return -ENOSPC;
752 
753 	err = f2fs_dquot_initialize(dir);
754 	if (err)
755 		return err;
756 
757 	inode = f2fs_new_inode(idmap, dir, mode, NULL);
758 	if (IS_ERR(inode))
759 		return PTR_ERR(inode);
760 
761 	init_special_inode(inode, inode->i_mode, rdev);
762 	inode->i_op = &f2fs_special_inode_operations;
763 
764 	f2fs_lock_op(sbi);
765 	err = f2fs_add_link(dentry, inode);
766 	if (err)
767 		goto out;
768 	f2fs_unlock_op(sbi);
769 
770 	f2fs_alloc_nid_done(sbi, inode->i_ino);
771 
772 	d_instantiate_new(dentry, inode);
773 
774 	if (IS_DIRSYNC(dir))
775 		f2fs_sync_fs(sbi->sb, 1);
776 
777 	f2fs_balance_fs(sbi, true);
778 	return 0;
779 out:
780 	f2fs_handle_failed_inode(inode);
781 	return err;
782 }
783 
__f2fs_tmpfile(struct mnt_idmap * idmap,struct inode * dir,struct file * file,umode_t mode,bool is_whiteout,struct inode ** new_inode,struct f2fs_filename * fname)784 static int __f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
785 			  struct file *file, umode_t mode, bool is_whiteout,
786 			  struct inode **new_inode, struct f2fs_filename *fname)
787 {
788 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
789 	struct inode *inode;
790 	int err;
791 
792 	err = f2fs_dquot_initialize(dir);
793 	if (err)
794 		return err;
795 
796 	inode = f2fs_new_inode(idmap, dir, mode, NULL);
797 	if (IS_ERR(inode))
798 		return PTR_ERR(inode);
799 
800 	if (is_whiteout) {
801 		init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
802 		inode->i_op = &f2fs_special_inode_operations;
803 	} else {
804 		inode->i_op = &f2fs_file_inode_operations;
805 		inode->i_fop = &f2fs_file_operations;
806 		inode->i_mapping->a_ops = &f2fs_dblock_aops;
807 	}
808 
809 	f2fs_lock_op(sbi);
810 	err = f2fs_acquire_orphan_inode(sbi);
811 	if (err)
812 		goto out;
813 
814 	err = f2fs_do_tmpfile(inode, dir, fname);
815 	if (err)
816 		goto release_out;
817 
818 	/*
819 	 * add this non-linked tmpfile to orphan list, in this way we could
820 	 * remove all unused data of tmpfile after abnormal power-off.
821 	 */
822 	f2fs_add_orphan_inode(inode);
823 	f2fs_alloc_nid_done(sbi, inode->i_ino);
824 
825 	if (is_whiteout) {
826 		f2fs_i_links_write(inode, false);
827 
828 		spin_lock(&inode->i_lock);
829 		inode->i_state |= I_LINKABLE;
830 		spin_unlock(&inode->i_lock);
831 	} else {
832 		if (file)
833 			d_tmpfile(file, inode);
834 		else
835 			f2fs_i_links_write(inode, false);
836 	}
837 	/* link_count was changed by d_tmpfile as well. */
838 	f2fs_unlock_op(sbi);
839 	unlock_new_inode(inode);
840 
841 	if (new_inode)
842 		*new_inode = inode;
843 
844 	f2fs_balance_fs(sbi, true);
845 	return 0;
846 
847 release_out:
848 	f2fs_release_orphan_inode(sbi);
849 out:
850 	f2fs_handle_failed_inode(inode);
851 	return err;
852 }
853 
f2fs_tmpfile(struct mnt_idmap * idmap,struct inode * dir,struct file * file,umode_t mode)854 static int f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
855 			struct file *file, umode_t mode)
856 {
857 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
858 	int err;
859 
860 	if (unlikely(f2fs_cp_error(sbi)))
861 		return -EIO;
862 	if (!f2fs_is_checkpoint_ready(sbi))
863 		return -ENOSPC;
864 
865 	err = __f2fs_tmpfile(idmap, dir, file, mode, false, NULL, NULL);
866 
867 	return finish_open_simple(file, err);
868 }
869 
f2fs_create_whiteout(struct mnt_idmap * idmap,struct inode * dir,struct inode ** whiteout,struct f2fs_filename * fname)870 static int f2fs_create_whiteout(struct mnt_idmap *idmap,
871 				struct inode *dir, struct inode **whiteout,
872 				struct f2fs_filename *fname)
873 {
874 	return __f2fs_tmpfile(idmap, dir, NULL, S_IFCHR | WHITEOUT_MODE,
875 						true, whiteout, fname);
876 }
877 
f2fs_get_tmpfile(struct mnt_idmap * idmap,struct inode * dir,struct inode ** new_inode)878 int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
879 		     struct inode **new_inode)
880 {
881 	return __f2fs_tmpfile(idmap, dir, NULL, S_IFREG,
882 				false, new_inode, NULL);
883 }
884 
f2fs_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)885 static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
886 			struct dentry *old_dentry, struct inode *new_dir,
887 			struct dentry *new_dentry, unsigned int flags)
888 {
889 	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
890 	struct inode *old_inode = d_inode(old_dentry);
891 	struct inode *new_inode = d_inode(new_dentry);
892 	struct inode *whiteout = NULL;
893 	struct page *old_dir_page = NULL;
894 	struct page *old_page, *new_page = NULL;
895 	struct f2fs_dir_entry *old_dir_entry = NULL;
896 	struct f2fs_dir_entry *old_entry;
897 	struct f2fs_dir_entry *new_entry;
898 	bool old_is_dir = S_ISDIR(old_inode->i_mode);
899 	int err;
900 
901 	if (unlikely(f2fs_cp_error(sbi)))
902 		return -EIO;
903 	if (!f2fs_is_checkpoint_ready(sbi))
904 		return -ENOSPC;
905 
906 	if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
907 			(!projid_eq(F2FS_I(new_dir)->i_projid,
908 			F2FS_I(old_dentry->d_inode)->i_projid)))
909 		return -EXDEV;
910 
911 	/*
912 	 * If new_inode is null, the below renaming flow will
913 	 * add a link in old_dir which can convert inline_dir.
914 	 * After then, if we failed to get the entry due to other
915 	 * reasons like ENOMEM, we had to remove the new entry.
916 	 * Instead of adding such the error handling routine, let's
917 	 * simply convert first here.
918 	 */
919 	if (old_dir == new_dir && !new_inode) {
920 		err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
921 		if (err)
922 			return err;
923 	}
924 
925 	if (flags & RENAME_WHITEOUT) {
926 		struct f2fs_filename fname;
927 
928 		err = f2fs_setup_filename(old_dir, &old_dentry->d_name,
929 							0, &fname);
930 		if (err)
931 			return err;
932 
933 		err = f2fs_create_whiteout(idmap, old_dir, &whiteout, &fname);
934 		if (err)
935 			return err;
936 	}
937 
938 	err = f2fs_dquot_initialize(old_dir);
939 	if (err)
940 		goto out;
941 
942 	err = f2fs_dquot_initialize(new_dir);
943 	if (err)
944 		goto out;
945 
946 	if (new_inode) {
947 		err = f2fs_dquot_initialize(new_inode);
948 		if (err)
949 			goto out;
950 	}
951 
952 	err = -ENOENT;
953 	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
954 	if (!old_entry) {
955 		if (IS_ERR(old_page))
956 			err = PTR_ERR(old_page);
957 		goto out;
958 	}
959 
960 	if (old_is_dir && old_dir != new_dir) {
961 		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
962 		if (!old_dir_entry) {
963 			if (IS_ERR(old_dir_page))
964 				err = PTR_ERR(old_dir_page);
965 			goto out_old;
966 		}
967 	}
968 
969 	if (new_inode) {
970 
971 		err = -ENOTEMPTY;
972 		if (old_is_dir && !f2fs_empty_dir(new_inode))
973 			goto out_dir;
974 
975 		err = -ENOENT;
976 		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
977 						&new_page);
978 		if (!new_entry) {
979 			if (IS_ERR(new_page))
980 				err = PTR_ERR(new_page);
981 			goto out_dir;
982 		}
983 
984 		f2fs_balance_fs(sbi, true);
985 
986 		f2fs_lock_op(sbi);
987 
988 		err = f2fs_acquire_orphan_inode(sbi);
989 		if (err)
990 			goto put_out_dir;
991 
992 		f2fs_set_link(new_dir, new_entry, new_page, old_inode);
993 		new_page = NULL;
994 
995 		inode_set_ctime_current(new_inode);
996 		f2fs_down_write(&F2FS_I(new_inode)->i_sem);
997 		if (old_is_dir)
998 			f2fs_i_links_write(new_inode, false);
999 		f2fs_i_links_write(new_inode, false);
1000 		f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1001 
1002 		if (!new_inode->i_nlink)
1003 			f2fs_add_orphan_inode(new_inode);
1004 		else
1005 			f2fs_release_orphan_inode(sbi);
1006 	} else {
1007 		f2fs_balance_fs(sbi, true);
1008 
1009 		f2fs_lock_op(sbi);
1010 
1011 		err = f2fs_add_link(new_dentry, old_inode);
1012 		if (err) {
1013 			f2fs_unlock_op(sbi);
1014 			goto out_dir;
1015 		}
1016 
1017 		if (old_is_dir)
1018 			f2fs_i_links_write(new_dir, true);
1019 	}
1020 
1021 	f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1022 	if (!old_is_dir || whiteout)
1023 		file_lost_pino(old_inode);
1024 	else
1025 		/* adjust dir's i_pino to pass fsck check */
1026 		f2fs_i_pino_write(old_inode, new_dir->i_ino);
1027 	f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1028 
1029 	inode_set_ctime_current(old_inode);
1030 	f2fs_mark_inode_dirty_sync(old_inode, false);
1031 
1032 	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1033 	old_page = NULL;
1034 
1035 	if (whiteout) {
1036 		set_inode_flag(whiteout, FI_INC_LINK);
1037 		err = f2fs_add_link(old_dentry, whiteout);
1038 		if (err)
1039 			goto put_out_dir;
1040 
1041 		spin_lock(&whiteout->i_lock);
1042 		whiteout->i_state &= ~I_LINKABLE;
1043 		spin_unlock(&whiteout->i_lock);
1044 
1045 		iput(whiteout);
1046 	}
1047 
1048 	if (old_dir_entry)
1049 		f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1050 	if (old_is_dir)
1051 		f2fs_i_links_write(old_dir, false);
1052 
1053 	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1054 		f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1055 		if (S_ISDIR(old_inode->i_mode))
1056 			f2fs_add_ino_entry(sbi, old_inode->i_ino,
1057 							TRANS_DIR_INO);
1058 	}
1059 
1060 	f2fs_unlock_op(sbi);
1061 
1062 	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1063 		f2fs_sync_fs(sbi->sb, 1);
1064 
1065 	f2fs_update_time(sbi, REQ_TIME);
1066 	return 0;
1067 
1068 put_out_dir:
1069 	f2fs_unlock_op(sbi);
1070 	f2fs_put_page(new_page, 0);
1071 out_dir:
1072 	if (old_dir_entry)
1073 		f2fs_put_page(old_dir_page, 0);
1074 out_old:
1075 	f2fs_put_page(old_page, 0);
1076 out:
1077 	iput(whiteout);
1078 	return err;
1079 }
1080 
f2fs_cross_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)1081 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1082 			     struct inode *new_dir, struct dentry *new_dentry)
1083 {
1084 	struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1085 	struct inode *old_inode = d_inode(old_dentry);
1086 	struct inode *new_inode = d_inode(new_dentry);
1087 	struct page *old_dir_page, *new_dir_page;
1088 	struct page *old_page, *new_page;
1089 	struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1090 	struct f2fs_dir_entry *old_entry, *new_entry;
1091 	int old_nlink = 0, new_nlink = 0;
1092 	int err;
1093 
1094 	if (unlikely(f2fs_cp_error(sbi)))
1095 		return -EIO;
1096 	if (!f2fs_is_checkpoint_ready(sbi))
1097 		return -ENOSPC;
1098 
1099 	if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1100 			!projid_eq(F2FS_I(new_dir)->i_projid,
1101 			F2FS_I(old_dentry->d_inode)->i_projid)) ||
1102 	    (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1103 			!projid_eq(F2FS_I(old_dir)->i_projid,
1104 			F2FS_I(new_dentry->d_inode)->i_projid)))
1105 		return -EXDEV;
1106 
1107 	err = f2fs_dquot_initialize(old_dir);
1108 	if (err)
1109 		goto out;
1110 
1111 	err = f2fs_dquot_initialize(new_dir);
1112 	if (err)
1113 		goto out;
1114 
1115 	err = -ENOENT;
1116 	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1117 	if (!old_entry) {
1118 		if (IS_ERR(old_page))
1119 			err = PTR_ERR(old_page);
1120 		goto out;
1121 	}
1122 
1123 	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1124 	if (!new_entry) {
1125 		if (IS_ERR(new_page))
1126 			err = PTR_ERR(new_page);
1127 		goto out_old;
1128 	}
1129 
1130 	/* prepare for updating ".." directory entry info later */
1131 	if (old_dir != new_dir) {
1132 		if (S_ISDIR(old_inode->i_mode)) {
1133 			old_dir_entry = f2fs_parent_dir(old_inode,
1134 							&old_dir_page);
1135 			if (!old_dir_entry) {
1136 				if (IS_ERR(old_dir_page))
1137 					err = PTR_ERR(old_dir_page);
1138 				goto out_new;
1139 			}
1140 		}
1141 
1142 		if (S_ISDIR(new_inode->i_mode)) {
1143 			new_dir_entry = f2fs_parent_dir(new_inode,
1144 							&new_dir_page);
1145 			if (!new_dir_entry) {
1146 				if (IS_ERR(new_dir_page))
1147 					err = PTR_ERR(new_dir_page);
1148 				goto out_old_dir;
1149 			}
1150 		}
1151 	}
1152 
1153 	/*
1154 	 * If cross rename between file and directory those are not
1155 	 * in the same directory, we will inc nlink of file's parent
1156 	 * later, so we should check upper boundary of its nlink.
1157 	 */
1158 	if ((!old_dir_entry || !new_dir_entry) &&
1159 				old_dir_entry != new_dir_entry) {
1160 		old_nlink = old_dir_entry ? -1 : 1;
1161 		new_nlink = -old_nlink;
1162 		err = -EMLINK;
1163 		if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1164 			(new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1165 			goto out_new_dir;
1166 	}
1167 
1168 	f2fs_balance_fs(sbi, true);
1169 
1170 	f2fs_lock_op(sbi);
1171 
1172 	/* update ".." directory entry info of old dentry */
1173 	if (old_dir_entry)
1174 		f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1175 
1176 	/* update ".." directory entry info of new dentry */
1177 	if (new_dir_entry)
1178 		f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1179 
1180 	/* update directory entry info of old dir inode */
1181 	f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1182 
1183 	f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1184 	if (!old_dir_entry)
1185 		file_lost_pino(old_inode);
1186 	else
1187 		/* adjust dir's i_pino to pass fsck check */
1188 		f2fs_i_pino_write(old_inode, new_dir->i_ino);
1189 	f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1190 
1191 	inode_set_ctime_current(old_dir);
1192 	if (old_nlink) {
1193 		f2fs_down_write(&F2FS_I(old_dir)->i_sem);
1194 		f2fs_i_links_write(old_dir, old_nlink > 0);
1195 		f2fs_up_write(&F2FS_I(old_dir)->i_sem);
1196 	}
1197 	f2fs_mark_inode_dirty_sync(old_dir, false);
1198 
1199 	/* update directory entry info of new dir inode */
1200 	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1201 
1202 	f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1203 	if (!new_dir_entry)
1204 		file_lost_pino(new_inode);
1205 	else
1206 		/* adjust dir's i_pino to pass fsck check */
1207 		f2fs_i_pino_write(new_inode, old_dir->i_ino);
1208 	f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1209 
1210 	inode_set_ctime_current(new_dir);
1211 	if (new_nlink) {
1212 		f2fs_down_write(&F2FS_I(new_dir)->i_sem);
1213 		f2fs_i_links_write(new_dir, new_nlink > 0);
1214 		f2fs_up_write(&F2FS_I(new_dir)->i_sem);
1215 	}
1216 	f2fs_mark_inode_dirty_sync(new_dir, false);
1217 
1218 	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1219 		f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1220 		f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1221 	}
1222 
1223 	f2fs_unlock_op(sbi);
1224 
1225 	if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1226 		f2fs_sync_fs(sbi->sb, 1);
1227 
1228 	f2fs_update_time(sbi, REQ_TIME);
1229 	return 0;
1230 out_new_dir:
1231 	if (new_dir_entry) {
1232 		f2fs_put_page(new_dir_page, 0);
1233 	}
1234 out_old_dir:
1235 	if (old_dir_entry) {
1236 		f2fs_put_page(old_dir_page, 0);
1237 	}
1238 out_new:
1239 	f2fs_put_page(new_page, 0);
1240 out_old:
1241 	f2fs_put_page(old_page, 0);
1242 out:
1243 	return err;
1244 }
1245 
f2fs_rename2(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1246 static int f2fs_rename2(struct mnt_idmap *idmap,
1247 			struct inode *old_dir, struct dentry *old_dentry,
1248 			struct inode *new_dir, struct dentry *new_dentry,
1249 			unsigned int flags)
1250 {
1251 	int err;
1252 
1253 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1254 		return -EINVAL;
1255 
1256 	trace_f2fs_rename_start(old_dir, old_dentry, new_dir, new_dentry,
1257 								flags);
1258 
1259 	err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1260 				     flags);
1261 	if (err)
1262 		return err;
1263 
1264 	if (flags & RENAME_EXCHANGE)
1265 		err = f2fs_cross_rename(old_dir, old_dentry,
1266 					new_dir, new_dentry);
1267 	else
1268 	/*
1269 	 * VFS has already handled the new dentry existence case,
1270 	 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1271 	 */
1272 		err = f2fs_rename(idmap, old_dir, old_dentry,
1273 					new_dir, new_dentry, flags);
1274 
1275 	trace_f2fs_rename_end(old_dentry, new_dentry, flags, err);
1276 	return err;
1277 }
1278 
f2fs_encrypted_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1279 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1280 					   struct inode *inode,
1281 					   struct delayed_call *done)
1282 {
1283 	struct page *page;
1284 	const char *target;
1285 
1286 	if (!dentry)
1287 		return ERR_PTR(-ECHILD);
1288 
1289 	page = read_mapping_page(inode->i_mapping, 0, NULL);
1290 	if (IS_ERR(page))
1291 		return ERR_CAST(page);
1292 
1293 	target = fscrypt_get_symlink(inode, page_address(page),
1294 				     inode->i_sb->s_blocksize, done);
1295 	put_page(page);
1296 	return target;
1297 }
1298 
f2fs_encrypted_symlink_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)1299 static int f2fs_encrypted_symlink_getattr(struct mnt_idmap *idmap,
1300 					  const struct path *path,
1301 					  struct kstat *stat, u32 request_mask,
1302 					  unsigned int query_flags)
1303 {
1304 	f2fs_getattr(idmap, path, stat, request_mask, query_flags);
1305 
1306 	return fscrypt_symlink_getattr(path, stat);
1307 }
1308 
1309 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1310 	.get_link	= f2fs_encrypted_get_link,
1311 	.getattr	= f2fs_encrypted_symlink_getattr,
1312 	.setattr	= f2fs_setattr,
1313 	.listxattr	= f2fs_listxattr,
1314 };
1315 
1316 const struct inode_operations f2fs_dir_inode_operations = {
1317 	.create		= f2fs_create,
1318 	.lookup		= f2fs_lookup,
1319 	.link		= f2fs_link,
1320 	.unlink		= f2fs_unlink,
1321 	.symlink	= f2fs_symlink,
1322 	.mkdir		= f2fs_mkdir,
1323 	.rmdir		= f2fs_rmdir,
1324 	.mknod		= f2fs_mknod,
1325 	.rename		= f2fs_rename2,
1326 	.tmpfile	= f2fs_tmpfile,
1327 	.getattr	= f2fs_getattr,
1328 	.setattr	= f2fs_setattr,
1329 	.get_inode_acl	= f2fs_get_acl,
1330 	.set_acl	= f2fs_set_acl,
1331 	.listxattr	= f2fs_listxattr,
1332 	.fiemap		= f2fs_fiemap,
1333 	.fileattr_get	= f2fs_fileattr_get,
1334 	.fileattr_set	= f2fs_fileattr_set,
1335 };
1336 
1337 const struct inode_operations f2fs_symlink_inode_operations = {
1338 	.get_link	= f2fs_get_link,
1339 	.getattr	= f2fs_getattr,
1340 	.setattr	= f2fs_setattr,
1341 	.listxattr	= f2fs_listxattr,
1342 };
1343 
1344 const struct inode_operations f2fs_special_inode_operations = {
1345 	.getattr	= f2fs_getattr,
1346 	.setattr	= f2fs_setattr,
1347 	.get_inode_acl	= f2fs_get_acl,
1348 	.set_acl	= f2fs_set_acl,
1349 	.listxattr	= f2fs_listxattr,
1350 };
1351