namei.c revision 354a3399dc6f7e556d04e1c731cd50e08eeb44bd 
1/*
2 * fs/f2fs/namei.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/pagemap.h>
14#include <linux/sched.h>
15#include <linux/ctype.h>
16
17#include "f2fs.h"
18#include "node.h"
19#include "xattr.h"
20#include "acl.h"
21#include <trace/events/f2fs.h>
22
23static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
24{
25	struct super_block *sb = dir->i_sb;
26	struct f2fs_sb_info *sbi = F2FS_SB(sb);
27	nid_t ino;
28	struct inode *inode;
29	bool nid_free = false;
30	int err, ilock;
31
32	inode = new_inode(sb);
33	if (!inode)
34		return ERR_PTR(-ENOMEM);
35
36	ilock = mutex_lock_op(sbi);
37	if (!alloc_nid(sbi, &ino)) {
38		mutex_unlock_op(sbi, ilock);
39		err = -ENOSPC;
40		goto fail;
41	}
42	mutex_unlock_op(sbi, ilock);
43
44	inode->i_uid = current_fsuid();
45
46	if (dir->i_mode & S_ISGID) {
47		inode->i_gid = dir->i_gid;
48		if (S_ISDIR(mode))
49			mode |= S_ISGID;
50	} else {
51		inode->i_gid = current_fsgid();
52	}
53
54	inode->i_ino = ino;
55	inode->i_mode = mode;
56	inode->i_blocks = 0;
57	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
58	inode->i_generation = sbi->s_next_generation++;
59
60	err = insert_inode_locked(inode);
61	if (err) {
62		err = -EINVAL;
63		nid_free = true;
64		goto out;
65	}
66	trace_f2fs_new_inode(inode, 0);
67	mark_inode_dirty(inode);
68	return inode;
69
70out:
71	clear_nlink(inode);
72	unlock_new_inode(inode);
73fail:
74	trace_f2fs_new_inode(inode, err);
75	make_bad_inode(inode);
76	iput(inode);
77	if (nid_free)
78		alloc_nid_failed(sbi, ino);
79	return ERR_PTR(err);
80}
81
82static int is_multimedia_file(const unsigned char *s, const char *sub)
83{
84	size_t slen = strlen(s);
85	size_t sublen = strlen(sub);
86	int ret;
87
88	if (sublen > slen)
89		return 0;
90
91	ret = memcmp(s + slen - sublen, sub, sublen);
92	if (ret) {	/* compare upper case */
93		int i;
94		char upper_sub[8];
95		for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
96			upper_sub[i] = toupper(sub[i]);
97		return !memcmp(s + slen - sublen, upper_sub, sublen);
98	}
99
100	return !ret;
101}
102
103/*
104 * Set multimedia files as cold files for hot/cold data separation
105 */
106static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
107		const unsigned char *name)
108{
109	int i;
110	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
111
112	int count = le32_to_cpu(sbi->raw_super->extension_count);
113	for (i = 0; i < count; i++) {
114		if (is_multimedia_file(name, extlist[i])) {
115			file_set_cold(inode);
116			break;
117		}
118	}
119}
120
121static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
122						bool excl)
123{
124	struct super_block *sb = dir->i_sb;
125	struct f2fs_sb_info *sbi = F2FS_SB(sb);
126	struct inode *inode;
127	nid_t ino = 0;
128	int err, ilock;
129
130	f2fs_balance_fs(sbi);
131
132	inode = f2fs_new_inode(dir, mode);
133	if (IS_ERR(inode))
134		return PTR_ERR(inode);
135
136	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
137		set_cold_files(sbi, inode, dentry->d_name.name);
138
139	inode->i_op = &f2fs_file_inode_operations;
140	inode->i_fop = &f2fs_file_operations;
141	inode->i_mapping->a_ops = &f2fs_dblock_aops;
142	ino = inode->i_ino;
143
144	ilock = mutex_lock_op(sbi);
145	err = f2fs_add_link(dentry, inode);
146	mutex_unlock_op(sbi, ilock);
147	if (err)
148		goto out;
149
150	alloc_nid_done(sbi, ino);
151
152	d_instantiate(dentry, inode);
153	unlock_new_inode(inode);
154	return 0;
155out:
156	clear_nlink(inode);
157	unlock_new_inode(inode);
158	make_bad_inode(inode);
159	iput(inode);
160	alloc_nid_failed(sbi, ino);
161	return err;
162}
163
164static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
165		struct dentry *dentry)
166{
167	struct inode *inode = old_dentry->d_inode;
168	struct super_block *sb = dir->i_sb;
169	struct f2fs_sb_info *sbi = F2FS_SB(sb);
170	int err, ilock;
171
172	f2fs_balance_fs(sbi);
173
174	inode->i_ctime = CURRENT_TIME;
175	ihold(inode);
176
177	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
178	ilock = mutex_lock_op(sbi);
179	err = f2fs_add_link(dentry, inode);
180	mutex_unlock_op(sbi, ilock);
181	if (err)
182		goto out;
183
184	d_instantiate(dentry, inode);
185	return 0;
186out:
187	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
188	iput(inode);
189	return err;
190}
191
192struct dentry *f2fs_get_parent(struct dentry *child)
193{
194	struct qstr dotdot = QSTR_INIT("..", 2);
195	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
196	if (!ino)
197		return ERR_PTR(-ENOENT);
198	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
199}
200
201static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
202		unsigned int flags)
203{
204	struct inode *inode = NULL;
205	struct f2fs_dir_entry *de;
206	struct page *page;
207
208	if (dentry->d_name.len > F2FS_NAME_LEN)
209		return ERR_PTR(-ENAMETOOLONG);
210
211	de = f2fs_find_entry(dir, &dentry->d_name, &page);
212	if (de) {
213		nid_t ino = le32_to_cpu(de->ino);
214		kunmap(page);
215		f2fs_put_page(page, 0);
216
217		inode = f2fs_iget(dir->i_sb, ino);
218		if (IS_ERR(inode))
219			return ERR_CAST(inode);
220	}
221
222	return d_splice_alias(inode, dentry);
223}
224
225static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
226{
227	struct super_block *sb = dir->i_sb;
228	struct f2fs_sb_info *sbi = F2FS_SB(sb);
229	struct inode *inode = dentry->d_inode;
230	struct f2fs_dir_entry *de;
231	struct page *page;
232	int err = -ENOENT;
233	int ilock;
234
235	trace_f2fs_unlink_enter(dir, dentry);
236	f2fs_balance_fs(sbi);
237
238	de = f2fs_find_entry(dir, &dentry->d_name, &page);
239	if (!de)
240		goto fail;
241
242	err = check_orphan_space(sbi);
243	if (err) {
244		kunmap(page);
245		f2fs_put_page(page, 0);
246		goto fail;
247	}
248
249	ilock = mutex_lock_op(sbi);
250	f2fs_delete_entry(de, page, inode);
251	mutex_unlock_op(sbi, ilock);
252
253	/* In order to evict this inode,  we set it dirty */
254	mark_inode_dirty(inode);
255fail:
256	trace_f2fs_unlink_exit(inode, err);
257	return err;
258}
259
260static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
261					const char *symname)
262{
263	struct super_block *sb = dir->i_sb;
264	struct f2fs_sb_info *sbi = F2FS_SB(sb);
265	struct inode *inode;
266	size_t symlen = strlen(symname) + 1;
267	int err, ilock;
268
269	f2fs_balance_fs(sbi);
270
271	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
272	if (IS_ERR(inode))
273		return PTR_ERR(inode);
274
275	inode->i_op = &f2fs_symlink_inode_operations;
276	inode->i_mapping->a_ops = &f2fs_dblock_aops;
277
278	ilock = mutex_lock_op(sbi);
279	err = f2fs_add_link(dentry, inode);
280	mutex_unlock_op(sbi, ilock);
281	if (err)
282		goto out;
283
284	err = page_symlink(inode, symname, symlen);
285	alloc_nid_done(sbi, inode->i_ino);
286
287	d_instantiate(dentry, inode);
288	unlock_new_inode(inode);
289	return err;
290out:
291	clear_nlink(inode);
292	unlock_new_inode(inode);
293	make_bad_inode(inode);
294	iput(inode);
295	alloc_nid_failed(sbi, inode->i_ino);
296	return err;
297}
298
299static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
300{
301	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
302	struct inode *inode;
303	int err, ilock;
304
305	f2fs_balance_fs(sbi);
306
307	inode = f2fs_new_inode(dir, S_IFDIR | mode);
308	if (IS_ERR(inode))
309		return PTR_ERR(inode);
310
311	inode->i_op = &f2fs_dir_inode_operations;
312	inode->i_fop = &f2fs_dir_operations;
313	inode->i_mapping->a_ops = &f2fs_dblock_aops;
314	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
315
316	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
317	ilock = mutex_lock_op(sbi);
318	err = f2fs_add_link(dentry, inode);
319	mutex_unlock_op(sbi, ilock);
320	if (err)
321		goto out_fail;
322
323	alloc_nid_done(sbi, inode->i_ino);
324
325	d_instantiate(dentry, inode);
326	unlock_new_inode(inode);
327
328	return 0;
329
330out_fail:
331	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
332	clear_nlink(inode);
333	unlock_new_inode(inode);
334	make_bad_inode(inode);
335	iput(inode);
336	alloc_nid_failed(sbi, inode->i_ino);
337	return err;
338}
339
340static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
341{
342	struct inode *inode = dentry->d_inode;
343	if (f2fs_empty_dir(inode))
344		return f2fs_unlink(dir, dentry);
345	return -ENOTEMPTY;
346}
347
348static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
349				umode_t mode, dev_t rdev)
350{
351	struct super_block *sb = dir->i_sb;
352	struct f2fs_sb_info *sbi = F2FS_SB(sb);
353	struct inode *inode;
354	int err = 0;
355	int ilock;
356
357	if (!new_valid_dev(rdev))
358		return -EINVAL;
359
360	f2fs_balance_fs(sbi);
361
362	inode = f2fs_new_inode(dir, mode);
363	if (IS_ERR(inode))
364		return PTR_ERR(inode);
365
366	init_special_inode(inode, inode->i_mode, rdev);
367	inode->i_op = &f2fs_special_inode_operations;
368
369	ilock = mutex_lock_op(sbi);
370	err = f2fs_add_link(dentry, inode);
371	mutex_unlock_op(sbi, ilock);
372	if (err)
373		goto out;
374
375	alloc_nid_done(sbi, inode->i_ino);
376	d_instantiate(dentry, inode);
377	unlock_new_inode(inode);
378	return 0;
379out:
380	clear_nlink(inode);
381	unlock_new_inode(inode);
382	make_bad_inode(inode);
383	iput(inode);
384	alloc_nid_failed(sbi, inode->i_ino);
385	return err;
386}
387
388static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
389			struct inode *new_dir, struct dentry *new_dentry)
390{
391	struct super_block *sb = old_dir->i_sb;
392	struct f2fs_sb_info *sbi = F2FS_SB(sb);
393	struct inode *old_inode = old_dentry->d_inode;
394	struct inode *new_inode = new_dentry->d_inode;
395	struct page *old_dir_page;
396	struct page *old_page;
397	struct f2fs_dir_entry *old_dir_entry = NULL;
398	struct f2fs_dir_entry *old_entry;
399	struct f2fs_dir_entry *new_entry;
400	int err = -ENOENT, ilock = -1;
401
402	f2fs_balance_fs(sbi);
403
404	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
405	if (!old_entry)
406		goto out;
407
408	if (S_ISDIR(old_inode->i_mode)) {
409		err = -EIO;
410		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
411		if (!old_dir_entry)
412			goto out_old;
413	}
414
415	ilock = mutex_lock_op(sbi);
416
417	if (new_inode) {
418		struct page *new_page;
419
420		err = -ENOTEMPTY;
421		if (old_dir_entry && !f2fs_empty_dir(new_inode))
422			goto out_dir;
423
424		err = -ENOENT;
425		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
426						&new_page);
427		if (!new_entry)
428			goto out_dir;
429
430		f2fs_set_link(new_dir, new_entry, new_page, old_inode);
431
432		new_inode->i_ctime = CURRENT_TIME;
433		if (old_dir_entry)
434			drop_nlink(new_inode);
435		drop_nlink(new_inode);
436		if (!new_inode->i_nlink)
437			add_orphan_inode(sbi, new_inode->i_ino);
438		update_inode_page(new_inode);
439	} else {
440		err = f2fs_add_link(new_dentry, old_inode);
441		if (err)
442			goto out_dir;
443
444		if (old_dir_entry) {
445			inc_nlink(new_dir);
446			update_inode_page(new_dir);
447		}
448	}
449
450	old_inode->i_ctime = CURRENT_TIME;
451	mark_inode_dirty(old_inode);
452
453	f2fs_delete_entry(old_entry, old_page, NULL);
454
455	if (old_dir_entry) {
456		if (old_dir != new_dir) {
457			f2fs_set_link(old_inode, old_dir_entry,
458						old_dir_page, new_dir);
459		} else {
460			kunmap(old_dir_page);
461			f2fs_put_page(old_dir_page, 0);
462		}
463		drop_nlink(old_dir);
464		update_inode_page(old_dir);
465	}
466
467	mutex_unlock_op(sbi, ilock);
468	return 0;
469
470out_dir:
471	if (old_dir_entry) {
472		kunmap(old_dir_page);
473		f2fs_put_page(old_dir_page, 0);
474	}
475	mutex_unlock_op(sbi, ilock);
476out_old:
477	kunmap(old_page);
478	f2fs_put_page(old_page, 0);
479out:
480	return err;
481}
482
483const struct inode_operations f2fs_dir_inode_operations = {
484	.create		= f2fs_create,
485	.lookup		= f2fs_lookup,
486	.link		= f2fs_link,
487	.unlink		= f2fs_unlink,
488	.symlink	= f2fs_symlink,
489	.mkdir		= f2fs_mkdir,
490	.rmdir		= f2fs_rmdir,
491	.mknod		= f2fs_mknod,
492	.rename		= f2fs_rename,
493	.getattr	= f2fs_getattr,
494	.setattr	= f2fs_setattr,
495	.get_acl	= f2fs_get_acl,
496#ifdef CONFIG_F2FS_FS_XATTR
497	.setxattr	= generic_setxattr,
498	.getxattr	= generic_getxattr,
499	.listxattr	= f2fs_listxattr,
500	.removexattr	= generic_removexattr,
501#endif
502};
503
504const struct inode_operations f2fs_symlink_inode_operations = {
505	.readlink       = generic_readlink,
506	.follow_link    = page_follow_link_light,
507	.put_link       = page_put_link,
508	.getattr	= f2fs_getattr,
509	.setattr	= f2fs_setattr,
510#ifdef CONFIG_F2FS_FS_XATTR
511	.setxattr	= generic_setxattr,
512	.getxattr	= generic_getxattr,
513	.listxattr	= f2fs_listxattr,
514	.removexattr	= generic_removexattr,
515#endif
516};
517
518const struct inode_operations f2fs_special_inode_operations = {
519	.getattr	= f2fs_getattr,
520	.setattr        = f2fs_setattr,
521	.get_acl	= f2fs_get_acl,
522#ifdef CONFIG_F2FS_FS_XATTR
523	.setxattr       = generic_setxattr,
524	.getxattr       = generic_getxattr,
525	.listxattr	= f2fs_listxattr,
526	.removexattr    = generic_removexattr,
527#endif
528};
529