xref: /openbmc/linux/fs/f2fs/inline.c (revision d0676871)
1  // SPDX-License-Identifier: GPL-2.0
2  /*
3   * fs/f2fs/inline.c
4   * Copyright (c) 2013, Intel Corporation
5   * Authors: Huajun Li <huajun.li@intel.com>
6   *          Haicheng Li <haicheng.li@intel.com>
7   */
8  
9  #include <linux/fs.h>
10  #include <linux/f2fs_fs.h>
11  
12  #include "f2fs.h"
13  #include "node.h"
14  
15  bool f2fs_may_inline_data(struct inode *inode)
16  {
17  	if (f2fs_is_atomic_file(inode))
18  		return false;
19  
20  	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
21  		return false;
22  
23  	if (i_size_read(inode) > MAX_INLINE_DATA(inode))
24  		return false;
25  
26  	if (f2fs_post_read_required(inode))
27  		return false;
28  
29  	return true;
30  }
31  
32  bool f2fs_may_inline_dentry(struct inode *inode)
33  {
34  	if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
35  		return false;
36  
37  	if (!S_ISDIR(inode->i_mode))
38  		return false;
39  
40  	return true;
41  }
42  
43  void f2fs_do_read_inline_data(struct page *page, struct page *ipage)
44  {
45  	struct inode *inode = page->mapping->host;
46  	void *src_addr, *dst_addr;
47  
48  	if (PageUptodate(page))
49  		return;
50  
51  	f2fs_bug_on(F2FS_P_SB(page), page->index);
52  
53  	zero_user_segment(page, MAX_INLINE_DATA(inode), PAGE_SIZE);
54  
55  	/* Copy the whole inline data block */
56  	src_addr = inline_data_addr(inode, ipage);
57  	dst_addr = kmap_atomic(page);
58  	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
59  	flush_dcache_page(page);
60  	kunmap_atomic(dst_addr);
61  	if (!PageUptodate(page))
62  		SetPageUptodate(page);
63  }
64  
65  void f2fs_truncate_inline_inode(struct inode *inode,
66  					struct page *ipage, u64 from)
67  {
68  	void *addr;
69  
70  	if (from >= MAX_INLINE_DATA(inode))
71  		return;
72  
73  	addr = inline_data_addr(inode, ipage);
74  
75  	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
76  	memset(addr + from, 0, MAX_INLINE_DATA(inode) - from);
77  	set_page_dirty(ipage);
78  
79  	if (from == 0)
80  		clear_inode_flag(inode, FI_DATA_EXIST);
81  }
82  
83  int f2fs_read_inline_data(struct inode *inode, struct page *page)
84  {
85  	struct page *ipage;
86  
87  	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
88  	if (IS_ERR(ipage)) {
89  		unlock_page(page);
90  		return PTR_ERR(ipage);
91  	}
92  
93  	if (!f2fs_has_inline_data(inode)) {
94  		f2fs_put_page(ipage, 1);
95  		return -EAGAIN;
96  	}
97  
98  	if (page->index)
99  		zero_user_segment(page, 0, PAGE_SIZE);
100  	else
101  		f2fs_do_read_inline_data(page, ipage);
102  
103  	if (!PageUptodate(page))
104  		SetPageUptodate(page);
105  	f2fs_put_page(ipage, 1);
106  	unlock_page(page);
107  	return 0;
108  }
109  
110  int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
111  {
112  	struct f2fs_io_info fio = {
113  		.sbi = F2FS_I_SB(dn->inode),
114  		.ino = dn->inode->i_ino,
115  		.type = DATA,
116  		.op = REQ_OP_WRITE,
117  		.op_flags = REQ_SYNC | REQ_PRIO,
118  		.page = page,
119  		.encrypted_page = NULL,
120  		.io_type = FS_DATA_IO,
121  	};
122  	struct node_info ni;
123  	int dirty, err;
124  
125  	if (!f2fs_exist_data(dn->inode))
126  		goto clear_out;
127  
128  	err = f2fs_reserve_block(dn, 0);
129  	if (err)
130  		return err;
131  
132  	err = f2fs_get_node_info(fio.sbi, dn->nid, &ni);
133  	if (err) {
134  		f2fs_truncate_data_blocks_range(dn, 1);
135  		f2fs_put_dnode(dn);
136  		return err;
137  	}
138  
139  	fio.version = ni.version;
140  
141  	if (unlikely(dn->data_blkaddr != NEW_ADDR)) {
142  		f2fs_put_dnode(dn);
143  		set_sbi_flag(fio.sbi, SBI_NEED_FSCK);
144  		f2fs_warn(fio.sbi, "%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, run fsck to fix.",
145  			  __func__, dn->inode->i_ino, dn->data_blkaddr);
146  		return -EFSCORRUPTED;
147  	}
148  
149  	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));
150  
151  	f2fs_do_read_inline_data(page, dn->inode_page);
152  	set_page_dirty(page);
153  
154  	/* clear dirty state */
155  	dirty = clear_page_dirty_for_io(page);
156  
157  	/* write data page to try to make data consistent */
158  	set_page_writeback(page);
159  	ClearPageError(page);
160  	fio.old_blkaddr = dn->data_blkaddr;
161  	set_inode_flag(dn->inode, FI_HOT_DATA);
162  	f2fs_outplace_write_data(dn, &fio);
163  	f2fs_wait_on_page_writeback(page, DATA, true, true);
164  	if (dirty) {
165  		inode_dec_dirty_pages(dn->inode);
166  		f2fs_remove_dirty_inode(dn->inode);
167  	}
168  
169  	/* this converted inline_data should be recovered. */
170  	set_inode_flag(dn->inode, FI_APPEND_WRITE);
171  
172  	/* clear inline data and flag after data writeback */
173  	f2fs_truncate_inline_inode(dn->inode, dn->inode_page, 0);
174  	clear_inline_node(dn->inode_page);
175  clear_out:
176  	stat_dec_inline_inode(dn->inode);
177  	clear_inode_flag(dn->inode, FI_INLINE_DATA);
178  	f2fs_put_dnode(dn);
179  	return 0;
180  }
181  
182  int f2fs_convert_inline_inode(struct inode *inode)
183  {
184  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
185  	struct dnode_of_data dn;
186  	struct page *ipage, *page;
187  	int err = 0;
188  
189  	if (!f2fs_has_inline_data(inode))
190  		return 0;
191  
192  	page = f2fs_grab_cache_page(inode->i_mapping, 0, false);
193  	if (!page)
194  		return -ENOMEM;
195  
196  	f2fs_lock_op(sbi);
197  
198  	ipage = f2fs_get_node_page(sbi, inode->i_ino);
199  	if (IS_ERR(ipage)) {
200  		err = PTR_ERR(ipage);
201  		goto out;
202  	}
203  
204  	set_new_dnode(&dn, inode, ipage, ipage, 0);
205  
206  	if (f2fs_has_inline_data(inode))
207  		err = f2fs_convert_inline_page(&dn, page);
208  
209  	f2fs_put_dnode(&dn);
210  out:
211  	f2fs_unlock_op(sbi);
212  
213  	f2fs_put_page(page, 1);
214  
215  	f2fs_balance_fs(sbi, dn.node_changed);
216  
217  	return err;
218  }
219  
220  int f2fs_write_inline_data(struct inode *inode, struct page *page)
221  {
222  	void *src_addr, *dst_addr;
223  	struct dnode_of_data dn;
224  	int err;
225  
226  	set_new_dnode(&dn, inode, NULL, NULL, 0);
227  	err = f2fs_get_dnode_of_data(&dn, 0, LOOKUP_NODE);
228  	if (err)
229  		return err;
230  
231  	if (!f2fs_has_inline_data(inode)) {
232  		f2fs_put_dnode(&dn);
233  		return -EAGAIN;
234  	}
235  
236  	f2fs_bug_on(F2FS_I_SB(inode), page->index);
237  
238  	f2fs_wait_on_page_writeback(dn.inode_page, NODE, true, true);
239  	src_addr = kmap_atomic(page);
240  	dst_addr = inline_data_addr(inode, dn.inode_page);
241  	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
242  	kunmap_atomic(src_addr);
243  	set_page_dirty(dn.inode_page);
244  
245  	f2fs_clear_page_cache_dirty_tag(page);
246  
247  	set_inode_flag(inode, FI_APPEND_WRITE);
248  	set_inode_flag(inode, FI_DATA_EXIST);
249  
250  	clear_inline_node(dn.inode_page);
251  	f2fs_put_dnode(&dn);
252  	return 0;
253  }
254  
255  bool f2fs_recover_inline_data(struct inode *inode, struct page *npage)
256  {
257  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
258  	struct f2fs_inode *ri = NULL;
259  	void *src_addr, *dst_addr;
260  	struct page *ipage;
261  
262  	/*
263  	 * The inline_data recovery policy is as follows.
264  	 * [prev.] [next] of inline_data flag
265  	 *    o       o  -> recover inline_data
266  	 *    o       x  -> remove inline_data, and then recover data blocks
267  	 *    x       o  -> remove inline_data, and then recover inline_data
268  	 *    x       x  -> recover data blocks
269  	 */
270  	if (IS_INODE(npage))
271  		ri = F2FS_INODE(npage);
272  
273  	if (f2fs_has_inline_data(inode) &&
274  			ri && (ri->i_inline & F2FS_INLINE_DATA)) {
275  process_inline:
276  		ipage = f2fs_get_node_page(sbi, inode->i_ino);
277  		f2fs_bug_on(sbi, IS_ERR(ipage));
278  
279  		f2fs_wait_on_page_writeback(ipage, NODE, true, true);
280  
281  		src_addr = inline_data_addr(inode, npage);
282  		dst_addr = inline_data_addr(inode, ipage);
283  		memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
284  
285  		set_inode_flag(inode, FI_INLINE_DATA);
286  		set_inode_flag(inode, FI_DATA_EXIST);
287  
288  		set_page_dirty(ipage);
289  		f2fs_put_page(ipage, 1);
290  		return true;
291  	}
292  
293  	if (f2fs_has_inline_data(inode)) {
294  		ipage = f2fs_get_node_page(sbi, inode->i_ino);
295  		f2fs_bug_on(sbi, IS_ERR(ipage));
296  		f2fs_truncate_inline_inode(inode, ipage, 0);
297  		clear_inode_flag(inode, FI_INLINE_DATA);
298  		f2fs_put_page(ipage, 1);
299  	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
300  		if (f2fs_truncate_blocks(inode, 0, false))
301  			return false;
302  		goto process_inline;
303  	}
304  	return false;
305  }
306  
307  struct f2fs_dir_entry *f2fs_find_in_inline_dir(struct inode *dir,
308  			struct fscrypt_name *fname, struct page **res_page)
309  {
310  	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
311  	struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
312  	struct f2fs_dir_entry *de;
313  	struct f2fs_dentry_ptr d;
314  	struct page *ipage;
315  	void *inline_dentry;
316  	f2fs_hash_t namehash;
317  
318  	ipage = f2fs_get_node_page(sbi, dir->i_ino);
319  	if (IS_ERR(ipage)) {
320  		*res_page = ipage;
321  		return NULL;
322  	}
323  
324  	namehash = f2fs_dentry_hash(dir, &name, fname);
325  
326  	inline_dentry = inline_data_addr(dir, ipage);
327  
328  	make_dentry_ptr_inline(dir, &d, inline_dentry);
329  	de = f2fs_find_target_dentry(fname, namehash, NULL, &d);
330  	unlock_page(ipage);
331  	if (de)
332  		*res_page = ipage;
333  	else
334  		f2fs_put_page(ipage, 0);
335  
336  	return de;
337  }
338  
339  int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent,
340  							struct page *ipage)
341  {
342  	struct f2fs_dentry_ptr d;
343  	void *inline_dentry;
344  
345  	inline_dentry = inline_data_addr(inode, ipage);
346  
347  	make_dentry_ptr_inline(inode, &d, inline_dentry);
348  	f2fs_do_make_empty_dir(inode, parent, &d);
349  
350  	set_page_dirty(ipage);
351  
352  	/* update i_size to MAX_INLINE_DATA */
353  	if (i_size_read(inode) < MAX_INLINE_DATA(inode))
354  		f2fs_i_size_write(inode, MAX_INLINE_DATA(inode));
355  	return 0;
356  }
357  
358  /*
359   * NOTE: ipage is grabbed by caller, but if any error occurs, we should
360   * release ipage in this function.
361   */
362  static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
363  							void *inline_dentry)
364  {
365  	struct page *page;
366  	struct dnode_of_data dn;
367  	struct f2fs_dentry_block *dentry_blk;
368  	struct f2fs_dentry_ptr src, dst;
369  	int err;
370  
371  	page = f2fs_grab_cache_page(dir->i_mapping, 0, true);
372  	if (!page) {
373  		f2fs_put_page(ipage, 1);
374  		return -ENOMEM;
375  	}
376  
377  	set_new_dnode(&dn, dir, ipage, NULL, 0);
378  	err = f2fs_reserve_block(&dn, 0);
379  	if (err)
380  		goto out;
381  
382  	if (unlikely(dn.data_blkaddr != NEW_ADDR)) {
383  		f2fs_put_dnode(&dn);
384  		set_sbi_flag(F2FS_P_SB(page), SBI_NEED_FSCK);
385  		f2fs_warn(F2FS_P_SB(page), "%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, run fsck to fix.",
386  			  __func__, dir->i_ino, dn.data_blkaddr);
387  		err = -EFSCORRUPTED;
388  		goto out;
389  	}
390  
391  	f2fs_wait_on_page_writeback(page, DATA, true, true);
392  
393  	dentry_blk = page_address(page);
394  
395  	make_dentry_ptr_inline(dir, &src, inline_dentry);
396  	make_dentry_ptr_block(dir, &dst, dentry_blk);
397  
398  	/* copy data from inline dentry block to new dentry block */
399  	memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
400  	memset(dst.bitmap + src.nr_bitmap, 0, dst.nr_bitmap - src.nr_bitmap);
401  	/*
402  	 * we do not need to zero out remainder part of dentry and filename
403  	 * field, since we have used bitmap for marking the usage status of
404  	 * them, besides, we can also ignore copying/zeroing reserved space
405  	 * of dentry block, because them haven't been used so far.
406  	 */
407  	memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
408  	memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);
409  
410  	if (!PageUptodate(page))
411  		SetPageUptodate(page);
412  	set_page_dirty(page);
413  
414  	/* clear inline dir and flag after data writeback */
415  	f2fs_truncate_inline_inode(dir, ipage, 0);
416  
417  	stat_dec_inline_dir(dir);
418  	clear_inode_flag(dir, FI_INLINE_DENTRY);
419  
420  	/*
421  	 * should retrieve reserved space which was used to keep
422  	 * inline_dentry's structure for backward compatibility.
423  	 */
424  	if (!f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(dir)) &&
425  			!f2fs_has_inline_xattr(dir))
426  		F2FS_I(dir)->i_inline_xattr_size = 0;
427  
428  	f2fs_i_depth_write(dir, 1);
429  	if (i_size_read(dir) < PAGE_SIZE)
430  		f2fs_i_size_write(dir, PAGE_SIZE);
431  out:
432  	f2fs_put_page(page, 1);
433  	return err;
434  }
435  
436  static int f2fs_add_inline_entries(struct inode *dir, void *inline_dentry)
437  {
438  	struct f2fs_dentry_ptr d;
439  	unsigned long bit_pos = 0;
440  	int err = 0;
441  
442  	make_dentry_ptr_inline(dir, &d, inline_dentry);
443  
444  	while (bit_pos < d.max) {
445  		struct f2fs_dir_entry *de;
446  		struct qstr new_name;
447  		nid_t ino;
448  		umode_t fake_mode;
449  
450  		if (!test_bit_le(bit_pos, d.bitmap)) {
451  			bit_pos++;
452  			continue;
453  		}
454  
455  		de = &d.dentry[bit_pos];
456  
457  		if (unlikely(!de->name_len)) {
458  			bit_pos++;
459  			continue;
460  		}
461  
462  		new_name.name = d.filename[bit_pos];
463  		new_name.len = le16_to_cpu(de->name_len);
464  
465  		ino = le32_to_cpu(de->ino);
466  		fake_mode = f2fs_get_de_type(de) << S_SHIFT;
467  
468  		err = f2fs_add_regular_entry(dir, &new_name, NULL, NULL,
469  							ino, fake_mode);
470  		if (err)
471  			goto punch_dentry_pages;
472  
473  		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
474  	}
475  	return 0;
476  punch_dentry_pages:
477  	truncate_inode_pages(&dir->i_data, 0);
478  	f2fs_truncate_blocks(dir, 0, false);
479  	f2fs_remove_dirty_inode(dir);
480  	return err;
481  }
482  
483  static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
484  							void *inline_dentry)
485  {
486  	void *backup_dentry;
487  	int err;
488  
489  	backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
490  				MAX_INLINE_DATA(dir), GFP_F2FS_ZERO);
491  	if (!backup_dentry) {
492  		f2fs_put_page(ipage, 1);
493  		return -ENOMEM;
494  	}
495  
496  	memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA(dir));
497  	f2fs_truncate_inline_inode(dir, ipage, 0);
498  
499  	unlock_page(ipage);
500  
501  	err = f2fs_add_inline_entries(dir, backup_dentry);
502  	if (err)
503  		goto recover;
504  
505  	lock_page(ipage);
506  
507  	stat_dec_inline_dir(dir);
508  	clear_inode_flag(dir, FI_INLINE_DENTRY);
509  
510  	/*
511  	 * should retrieve reserved space which was used to keep
512  	 * inline_dentry's structure for backward compatibility.
513  	 */
514  	if (!f2fs_sb_has_flexible_inline_xattr(F2FS_I_SB(dir)) &&
515  			!f2fs_has_inline_xattr(dir))
516  		F2FS_I(dir)->i_inline_xattr_size = 0;
517  
518  	kvfree(backup_dentry);
519  	return 0;
520  recover:
521  	lock_page(ipage);
522  	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
523  	memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA(dir));
524  	f2fs_i_depth_write(dir, 0);
525  	f2fs_i_size_write(dir, MAX_INLINE_DATA(dir));
526  	set_page_dirty(ipage);
527  	f2fs_put_page(ipage, 1);
528  
529  	kvfree(backup_dentry);
530  	return err;
531  }
532  
533  static int do_convert_inline_dir(struct inode *dir, struct page *ipage,
534  							void *inline_dentry)
535  {
536  	if (!F2FS_I(dir)->i_dir_level)
537  		return f2fs_move_inline_dirents(dir, ipage, inline_dentry);
538  	else
539  		return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
540  }
541  
542  int f2fs_try_convert_inline_dir(struct inode *dir, struct dentry *dentry)
543  {
544  	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
545  	struct page *ipage;
546  	struct fscrypt_name fname;
547  	void *inline_dentry = NULL;
548  	int err = 0;
549  
550  	if (!f2fs_has_inline_dentry(dir))
551  		return 0;
552  
553  	f2fs_lock_op(sbi);
554  
555  	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &fname);
556  	if (err)
557  		goto out;
558  
559  	ipage = f2fs_get_node_page(sbi, dir->i_ino);
560  	if (IS_ERR(ipage)) {
561  		err = PTR_ERR(ipage);
562  		goto out;
563  	}
564  
565  	if (f2fs_has_enough_room(dir, ipage, &fname)) {
566  		f2fs_put_page(ipage, 1);
567  		goto out;
568  	}
569  
570  	inline_dentry = inline_data_addr(dir, ipage);
571  
572  	err = do_convert_inline_dir(dir, ipage, inline_dentry);
573  	if (!err)
574  		f2fs_put_page(ipage, 1);
575  out:
576  	f2fs_unlock_op(sbi);
577  	return err;
578  }
579  
580  int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
581  				const struct qstr *orig_name,
582  				struct inode *inode, nid_t ino, umode_t mode)
583  {
584  	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
585  	struct page *ipage;
586  	unsigned int bit_pos;
587  	f2fs_hash_t name_hash;
588  	void *inline_dentry = NULL;
589  	struct f2fs_dentry_ptr d;
590  	int slots = GET_DENTRY_SLOTS(new_name->len);
591  	struct page *page = NULL;
592  	int err = 0;
593  
594  	ipage = f2fs_get_node_page(sbi, dir->i_ino);
595  	if (IS_ERR(ipage))
596  		return PTR_ERR(ipage);
597  
598  	inline_dentry = inline_data_addr(dir, ipage);
599  	make_dentry_ptr_inline(dir, &d, inline_dentry);
600  
601  	bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
602  	if (bit_pos >= d.max) {
603  		err = do_convert_inline_dir(dir, ipage, inline_dentry);
604  		if (err)
605  			return err;
606  		err = -EAGAIN;
607  		goto out;
608  	}
609  
610  	if (inode) {
611  		down_write(&F2FS_I(inode)->i_sem);
612  		page = f2fs_init_inode_metadata(inode, dir, new_name,
613  						orig_name, ipage);
614  		if (IS_ERR(page)) {
615  			err = PTR_ERR(page);
616  			goto fail;
617  		}
618  	}
619  
620  	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
621  
622  	name_hash = f2fs_dentry_hash(dir, new_name, NULL);
623  	f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);
624  
625  	set_page_dirty(ipage);
626  
627  	/* we don't need to mark_inode_dirty now */
628  	if (inode) {
629  		f2fs_i_pino_write(inode, dir->i_ino);
630  
631  		/* synchronize inode page's data from inode cache */
632  		if (is_inode_flag_set(inode, FI_NEW_INODE))
633  			f2fs_update_inode(inode, page);
634  
635  		f2fs_put_page(page, 1);
636  	}
637  
638  	f2fs_update_parent_metadata(dir, inode, 0);
639  fail:
640  	if (inode)
641  		up_write(&F2FS_I(inode)->i_sem);
642  out:
643  	f2fs_put_page(ipage, 1);
644  	return err;
645  }
646  
647  void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
648  					struct inode *dir, struct inode *inode)
649  {
650  	struct f2fs_dentry_ptr d;
651  	void *inline_dentry;
652  	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
653  	unsigned int bit_pos;
654  	int i;
655  
656  	lock_page(page);
657  	f2fs_wait_on_page_writeback(page, NODE, true, true);
658  
659  	inline_dentry = inline_data_addr(dir, page);
660  	make_dentry_ptr_inline(dir, &d, inline_dentry);
661  
662  	bit_pos = dentry - d.dentry;
663  	for (i = 0; i < slots; i++)
664  		__clear_bit_le(bit_pos + i, d.bitmap);
665  
666  	set_page_dirty(page);
667  	f2fs_put_page(page, 1);
668  
669  	dir->i_ctime = dir->i_mtime = current_time(dir);
670  	f2fs_mark_inode_dirty_sync(dir, false);
671  
672  	if (inode)
673  		f2fs_drop_nlink(dir, inode);
674  }
675  
676  bool f2fs_empty_inline_dir(struct inode *dir)
677  {
678  	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
679  	struct page *ipage;
680  	unsigned int bit_pos = 2;
681  	void *inline_dentry;
682  	struct f2fs_dentry_ptr d;
683  
684  	ipage = f2fs_get_node_page(sbi, dir->i_ino);
685  	if (IS_ERR(ipage))
686  		return false;
687  
688  	inline_dentry = inline_data_addr(dir, ipage);
689  	make_dentry_ptr_inline(dir, &d, inline_dentry);
690  
691  	bit_pos = find_next_bit_le(d.bitmap, d.max, bit_pos);
692  
693  	f2fs_put_page(ipage, 1);
694  
695  	if (bit_pos < d.max)
696  		return false;
697  
698  	return true;
699  }
700  
701  int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
702  				struct fscrypt_str *fstr)
703  {
704  	struct inode *inode = file_inode(file);
705  	struct page *ipage = NULL;
706  	struct f2fs_dentry_ptr d;
707  	void *inline_dentry = NULL;
708  	int err;
709  
710  	make_dentry_ptr_inline(inode, &d, inline_dentry);
711  
712  	if (ctx->pos == d.max)
713  		return 0;
714  
715  	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
716  	if (IS_ERR(ipage))
717  		return PTR_ERR(ipage);
718  
719  	/*
720  	 * f2fs_readdir was protected by inode.i_rwsem, it is safe to access
721  	 * ipage without page's lock held.
722  	 */
723  	unlock_page(ipage);
724  
725  	inline_dentry = inline_data_addr(inode, ipage);
726  
727  	make_dentry_ptr_inline(inode, &d, inline_dentry);
728  
729  	err = f2fs_fill_dentries(ctx, &d, 0, fstr);
730  	if (!err)
731  		ctx->pos = d.max;
732  
733  	f2fs_put_page(ipage, 0);
734  	return err < 0 ? err : 0;
735  }
736  
737  int f2fs_inline_data_fiemap(struct inode *inode,
738  		struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
739  {
740  	__u64 byteaddr, ilen;
741  	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
742  		FIEMAP_EXTENT_LAST;
743  	struct node_info ni;
744  	struct page *ipage;
745  	int err = 0;
746  
747  	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
748  	if (IS_ERR(ipage))
749  		return PTR_ERR(ipage);
750  
751  	if ((S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
752  				!f2fs_has_inline_data(inode)) {
753  		err = -EAGAIN;
754  		goto out;
755  	}
756  
757  	if (S_ISDIR(inode->i_mode) && !f2fs_has_inline_dentry(inode)) {
758  		err = -EAGAIN;
759  		goto out;
760  	}
761  
762  	ilen = min_t(size_t, MAX_INLINE_DATA(inode), i_size_read(inode));
763  	if (start >= ilen)
764  		goto out;
765  	if (start + len < ilen)
766  		ilen = start + len;
767  	ilen -= start;
768  
769  	err = f2fs_get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
770  	if (err)
771  		goto out;
772  
773  	byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
774  	byteaddr += (char *)inline_data_addr(inode, ipage) -
775  					(char *)F2FS_INODE(ipage);
776  	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
777  out:
778  	f2fs_put_page(ipage, 1);
779  	return err;
780  }
781